fs/reiserfs/journal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Write ahead logging implementation copyright Chris Mason 2000
   4  *
   5  * The background commits make this code very interrelated, and
   6  * overly complex.  I need to rethink things a bit....The major players:
   7  *
   8  * journal_begin -- call with the number of blocks you expect to log.
   9  *                  If the current transaction is too
  10  *                  old, it will block until the current transaction is
  11  *                  finished, and then start a new one.
  12  *                  Usually, your transaction will get joined in with
  13  *                  previous ones for speed.
  14  *
  15  * journal_join  -- same as journal_begin, but won't block on the current
  16  *                  transaction regardless of age.  Don't ever call
  17  *                  this.  Ever.  There are only two places it should be
  18  *                  called from, and they are both inside this file.
  19  *
  20  * journal_mark_dirty -- adds blocks into this transaction.  clears any flags
  21  *                       that might make them get sent to disk
  22  *                       and then marks them BH_JDirty.  Puts the buffer head
  23  *                       into the current transaction hash.
  24  *
  25  * journal_end -- if the current transaction is batchable, it does nothing
  26  *                   otherwise, it could do an async/synchronous commit, or
  27  *                   a full flush of all log and real blocks in the
  28  *                   transaction.
  29  *
  30  * flush_old_commits -- if the current transaction is too old, it is ended and
  31  *                      commit blocks are sent to disk.  Forces commit blocks
  32  *                      to disk for all backgrounded commits that have been
  33  *                      around too long.
  34  *                   -- Note, if you call this as an immediate flush from
  35  *                      within kupdate, it will ignore the immediate flag
  36  */
  37
  38 #include <linux/time.h>
  39 #include <linux/semaphore.h>
  40 #include <linux/vmalloc.h>
  41 #include "reiserfs.h"
  42 #include <linux/kernel.h>
  43 #include <linux/errno.h>
  44 #include <linux/fcntl.h>
  45 #include <linux/stat.h>
  46 #include <linux/string.h>
  47 #include <linux/buffer_head.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/writeback.h>
  50 #include <linux/blkdev.h>
  51 #include <linux/backing-dev.h>
  52 #include <linux/uaccess.h>
  53 #include <linux/slab.h>
  54
  55
  56 /* gets a struct reiserfs_journal_list * from a list head */
  57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
  58                                j_list))
  59
  60 /* must be correct to keep the desc and commit structs at 4k */
  61 #define JOURNAL_TRANS_HALF 1018
  62 #define BUFNR 64                /*read ahead */
  63
  64 /* cnode stat bits.  Move these into reiserfs_fs.h */
  65
  66 /* this block was freed, and can't be written.  */
  67 #define BLOCK_FREED 2
  68 /* this block was freed during this transaction, and can't be written */
  69 #define BLOCK_FREED_HOLDER 3
  70
  71 /* used in flush_journal_list */
  72 #define BLOCK_NEEDS_FLUSH 4
  73 #define BLOCK_DIRTIED 5
  74
  75 /* journal list state bits */
  76 #define LIST_TOUCHED 1
  77 #define LIST_DIRTY   2
  78 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
  79
  80 /* flags for do_journal_end */
  81 #define FLUSH_ALL   1           /* flush commit and real blocks */
  82 #define COMMIT_NOW  2           /* end and commit this transaction */
  83 #define WAIT        4           /* wait for the log blocks to hit the disk */
  84
  85 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
  86 static int flush_journal_list(struct super_block *s,
  87                               struct reiserfs_journal_list *jl, int flushall);
  88 static int flush_commit_list(struct super_block *s,
  89                              struct reiserfs_journal_list *jl, int flushall);
  90 static int can_dirty(struct reiserfs_journal_cnode *cn);
  91 static int journal_join(struct reiserfs_transaction_handle *th,
  92                         struct super_block *sb);
  93 static void release_journal_dev(struct reiserfs_journal *journal);
  94 static void dirty_one_transaction(struct super_block *s,
  95                                  struct reiserfs_journal_list *jl);
  96 static void flush_async_commits(struct work_struct *work);
  97 static void queue_log_writer(struct super_block *s);
  98
  99 /* values for join in do_journal_begin_r */
 100 enum {
 101         JBEGIN_REG = 0,         /* regular journal begin */
 102         /* join the running transaction if at all possible */
 103         JBEGIN_JOIN = 1,
 104         /* called from cleanup code, ignores aborted flag */
 105         JBEGIN_ABORT = 2,
 106 };
 107
 108 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
 109                               struct super_block *sb,
 110                               unsigned long nblocks, int join);
 111
 112 static void init_journal_hash(struct super_block *sb)
 113 {
 114         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 115         memset(journal->j_hash_table, 0,
 116                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
 117 }
 118
 119 /*
 120  * clears BH_Dirty and sticks the buffer on the clean list.  Called because
 121  * I can't allow refile_buffer to make schedule happen after I've freed a
 122  * block.  Look at remove_from_transaction and journal_mark_freed for
 123  * more details.
 124  */
 125 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
 126 {
 127         if (bh) {
 128                 clear_buffer_dirty(bh);
 129                 clear_buffer_journal_test(bh);
 130         }
 131         return 0;
 132 }
 133
 134 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
 135                                                          *sb)
 136 {
 137         struct reiserfs_bitmap_node *bn;
 138         static int id;
 139
 140         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
 141         if (!bn) {
 142                 return NULL;
 143         }
 144         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
 145         if (!bn->data) {
 146                 kfree(bn);
 147                 return NULL;
 148         }
 149         bn->id = id++;
 150         INIT_LIST_HEAD(&bn->list);
 151         return bn;
 152 }
 153
 154 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
 155 {
 156         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 157         struct reiserfs_bitmap_node *bn = NULL;
 158         struct list_head *entry = journal->j_bitmap_nodes.next;
 159
 160         journal->j_used_bitmap_nodes++;
 161 repeat:
 162
 163         if (entry != &journal->j_bitmap_nodes) {
 164                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
 165                 list_del(entry);
 166                 memset(bn->data, 0, sb->s_blocksize);
 167                 journal->j_free_bitmap_nodes--;
 168                 return bn;
 169         }
 170         bn = allocate_bitmap_node(sb);
 171         if (!bn) {
 172                 yield();
 173                 goto repeat;
 174         }
 175         return bn;
 176 }
 177 static inline void free_bitmap_node(struct super_block *sb,
 178                                     struct reiserfs_bitmap_node *bn)
 179 {
 180         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 181         journal->j_used_bitmap_nodes--;
 182         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
 183                 kfree(bn->data);
 184                 kfree(bn);
 185         } else {
 186                 list_add(&bn->list, &journal->j_bitmap_nodes);
 187                 journal->j_free_bitmap_nodes++;
 188         }
 189 }
 190
 191 static void allocate_bitmap_nodes(struct super_block *sb)
 192 {
 193         int i;
 194         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 195         struct reiserfs_bitmap_node *bn = NULL;
 196         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
 197                 bn = allocate_bitmap_node(sb);
 198                 if (bn) {
 199                         list_add(&bn->list, &journal->j_bitmap_nodes);
 200                         journal->j_free_bitmap_nodes++;
 201                 } else {
 202                         /* this is ok, we'll try again when more are needed */
 203                         break;
 204                 }
 205         }
 206 }
 207
 208 static int set_bit_in_list_bitmap(struct super_block *sb,
 209                                   b_blocknr_t block,
 210                                   struct reiserfs_list_bitmap *jb)
 211 {
 212         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
 213         unsigned int bit_nr = block % (sb->s_blocksize << 3);
 214
 215         if (!jb->bitmaps[bmap_nr]) {
 216                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
 217         }
 218         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
 219         return 0;
 220 }
 221
 222 static void cleanup_bitmap_list(struct super_block *sb,
 223                                 struct reiserfs_list_bitmap *jb)
 224 {
 225         int i;
 226         if (jb->bitmaps == NULL)
 227                 return;
 228
 229         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
 230                 if (jb->bitmaps[i]) {
 231                         free_bitmap_node(sb, jb->bitmaps[i]);
 232                         jb->bitmaps[i] = NULL;
 233                 }
 234         }
 235 }
 236
 237 /*
 238  * only call this on FS unmount.
 239  */
 240 static int free_list_bitmaps(struct super_block *sb,
 241                              struct reiserfs_list_bitmap *jb_array)
 242 {
 243         int i;
 244         struct reiserfs_list_bitmap *jb;
 245         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 246                 jb = jb_array + i;
 247                 jb->journal_list = NULL;
 248                 cleanup_bitmap_list(sb, jb);
 249                 vfree(jb->bitmaps);
 250                 jb->bitmaps = NULL;
 251         }
 252         return 0;
 253 }
 254
 255 static int free_bitmap_nodes(struct super_block *sb)
 256 {
 257         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 258         struct list_head *next = journal->j_bitmap_nodes.next;
 259         struct reiserfs_bitmap_node *bn;
 260
 261         while (next != &journal->j_bitmap_nodes) {
 262                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
 263                 list_del(next);
 264                 kfree(bn->data);
 265                 kfree(bn);
 266                 next = journal->j_bitmap_nodes.next;
 267                 journal->j_free_bitmap_nodes--;
 268         }
 269
 270         return 0;
 271 }
 272
 273 /*
 274  * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
 275  * jb_array is the array to be filled in.
 276  */
 277 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
 278                                    struct reiserfs_list_bitmap *jb_array,
 279                                    unsigned int bmap_nr)
 280 {
 281         int i;
 282         int failed = 0;
 283         struct reiserfs_list_bitmap *jb;
 284         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
 285
 286         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 287                 jb = jb_array + i;
 288                 jb->journal_list = NULL;
 289                 jb->bitmaps = vzalloc(mem);
 290                 if (!jb->bitmaps) {
 291                         reiserfs_warning(sb, "clm-2000", "unable to "
 292                                          "allocate bitmaps for journal lists");
 293                         failed = 1;
 294                         break;
 295                 }
 296         }
 297         if (failed) {
 298                 free_list_bitmaps(sb, jb_array);
 299                 return -1;
 300         }
 301         return 0;
 302 }
 303
 304 /*
 305  * find an available list bitmap.  If you can't find one, flush a commit list
 306  * and try again
 307  */
 308 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
 309                                                     struct reiserfs_journal_list
 310                                                     *jl)
 311 {
 312         int i, j;
 313         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 314         struct reiserfs_list_bitmap *jb = NULL;
 315
 316         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
 317                 i = journal->j_list_bitmap_index;
 318                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
 319                 jb = journal->j_list_bitmap + i;
 320                 if (journal->j_list_bitmap[i].journal_list) {
 321                         flush_commit_list(sb,
 322                                           journal->j_list_bitmap[i].
 323                                           journal_list, 1);
 324                         if (!journal->j_list_bitmap[i].journal_list) {
 325                                 break;
 326                         }
 327                 } else {
 328                         break;
 329                 }
 330         }
 331         /* double check to make sure if flushed correctly */
 332         if (jb->journal_list)
 333                 return NULL;
 334         jb->journal_list = jl;
 335         return jb;
 336 }
 337
 338 /*
 339  * allocates a new chunk of X nodes, and links them all together as a list.
 340  * Uses the cnode->next and cnode->prev pointers
 341  * returns NULL on failure
 342  */
 343 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
 344 {
 345         struct reiserfs_journal_cnode *head;
 346         int i;
 347         if (num_cnodes <= 0) {
 348                 return NULL;
 349         }
 350         head = vzalloc(array_size(num_cnodes,
 351                                   sizeof(struct reiserfs_journal_cnode)));
 352         if (!head) {
 353                 return NULL;
 354         }
 355         head[0].prev = NULL;
 356         head[0].next = head + 1;
 357         for (i = 1; i < num_cnodes; i++) {
 358                 head[i].prev = head + (i - 1);
 359                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
 360         }
 361         head[num_cnodes - 1].next = NULL;
 362         return head;
 363 }
 364
 365 /* pulls a cnode off the free list, or returns NULL on failure */
 366 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
 367 {
 368         struct reiserfs_journal_cnode *cn;
 369         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 370
 371         reiserfs_check_lock_depth(sb, "get_cnode");
 372
 373         if (journal->j_cnode_free <= 0) {
 374                 return NULL;
 375         }
 376         journal->j_cnode_used++;
 377         journal->j_cnode_free--;
 378         cn = journal->j_cnode_free_list;
 379         if (!cn) {
 380                 return cn;
 381         }
 382         if (cn->next) {
 383                 cn->next->prev = NULL;
 384         }
 385         journal->j_cnode_free_list = cn->next;
 386         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
 387         return cn;
 388 }
 389
 390 /*
 391  * returns a cnode to the free list
 392  */
 393 static void free_cnode(struct super_block *sb,
 394                        struct reiserfs_journal_cnode *cn)
 395 {
 396         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 397
 398         reiserfs_check_lock_depth(sb, "free_cnode");
 399
 400         journal->j_cnode_used--;
 401         journal->j_cnode_free++;
 402         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
 403         cn->next = journal->j_cnode_free_list;
 404         if (journal->j_cnode_free_list) {
 405                 journal->j_cnode_free_list->prev = cn;
 406         }
 407         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
 408         journal->j_cnode_free_list = cn;
 409 }
 410
 411 static void clear_prepared_bits(struct buffer_head *bh)
 412 {
 413         clear_buffer_journal_prepared(bh);
 414         clear_buffer_journal_restore_dirty(bh);
 415 }
 416
 417 /*
 418  * return a cnode with same dev, block number and size in table,
 419  * or null if not found
 420  */
 421 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
 422                                                                   super_block
 423                                                                   *sb,
 424                                                                   struct
 425                                                                   reiserfs_journal_cnode
 426                                                                   **table,
 427                                                                   long bl)
 428 {
 429         struct reiserfs_journal_cnode *cn;
 430         cn = journal_hash(table, sb, bl);
 431         while (cn) {
 432                 if (cn->blocknr == bl && cn->sb == sb)
 433                         return cn;
 434                 cn = cn->hnext;
 435         }
 436         return (struct reiserfs_journal_cnode *)0;
 437 }
 438
 439 /*
 440  * this actually means 'can this block be reallocated yet?'.  If you set
 441  * search_all, a block can only be allocated if it is not in the current
 442  * transaction, was not freed by the current transaction, and has no chance
 443  * of ever being overwritten by a replay after crashing.
 444  *
 445  * If you don't set search_all, a block can only be allocated if it is not
 446  * in the current transaction.  Since deleting a block removes it from the
 447  * current transaction, this case should never happen.  If you don't set
 448  * search_all, make sure you never write the block without logging it.
 449  *
 450  * next_zero_bit is a suggestion about the next block to try for find_forward.
 451  * when bl is rejected because it is set in a journal list bitmap, we search
 452  * for the next zero bit in the bitmap that rejected bl.  Then, we return
 453  * that through next_zero_bit for find_forward to try.
 454  *
 455  * Just because we return something in next_zero_bit does not mean we won't
 456  * reject it on the next call to reiserfs_in_journal
 457  */
 458 int reiserfs_in_journal(struct super_block *sb,
 459                         unsigned int bmap_nr, int bit_nr, int search_all,
 460                         b_blocknr_t * next_zero_bit)
 461 {
 462         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 463         struct reiserfs_list_bitmap *jb;
 464         int i;
 465         unsigned long bl;
 466
 467         *next_zero_bit = 0;     /* always start this at zero. */
 468
 469         PROC_INFO_INC(sb, journal.in_journal);
 470         /*
 471          * If we aren't doing a search_all, this is a metablock, and it
 472          * will be logged before use.  if we crash before the transaction
 473          * that freed it commits,  this transaction won't have committed
 474          * either, and the block will never be written
 475          */
 476         if (search_all) {
 477                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 478                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
 479                         jb = journal->j_list_bitmap + i;
 480                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
 481                             test_bit(bit_nr,
 482                                      (unsigned long *)jb->bitmaps[bmap_nr]->
 483                                      data)) {
 484                                 *next_zero_bit =
 485                                     find_next_zero_bit((unsigned long *)
 486                                                        (jb->bitmaps[bmap_nr]->
 487                                                         data),
 488                                                        sb->s_blocksize << 3,
 489                                                        bit_nr + 1);
 490                                 return 1;
 491                         }
 492                 }
 493         }
 494
 495         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
 496         /* is it in any old transactions? */
 497         if (search_all
 498             && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
 499                 return 1;
 500         }
 501
 502         /* is it in the current transaction.  This should never happen */
 503         if ((get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
 504                 BUG();
 505                 return 1;
 506         }
 507
 508         PROC_INFO_INC(sb, journal.in_journal_reusable);
 509         /* safe for reuse */
 510         return 0;
 511 }
 512
 513 /* insert cn into table */
 514 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 515                                        struct reiserfs_journal_cnode *cn)
 516 {
 517         struct reiserfs_journal_cnode *cn_orig;
 518
 519         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
 520         cn->hnext = cn_orig;
 521         cn->hprev = NULL;
 522         if (cn_orig) {
 523                 cn_orig->hprev = cn;
 524         }
 525         journal_hash(table, cn->sb, cn->blocknr) = cn;
 526 }
 527
 528 /* lock the current transaction */
 529 static inline void lock_journal(struct super_block *sb)
 530 {
 531         PROC_INFO_INC(sb, journal.lock_journal);
 532
 533         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 534 }
 535
 536 /* unlock the current transaction */
 537 static inline void unlock_journal(struct super_block *sb)
 538 {
 539         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
 540 }
 541
 542 static inline void get_journal_list(struct reiserfs_journal_list *jl)
 543 {
 544         jl->j_refcount++;
 545 }
 546
 547 static inline void put_journal_list(struct super_block *s,
 548                                     struct reiserfs_journal_list *jl)
 549 {
 550         if (jl->j_refcount < 1) {
 551                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
 552                                jl->j_trans_id, jl->j_refcount);
 553         }
 554         if (--jl->j_refcount == 0)
 555                 kfree(jl);
 556 }
 557
 558 /*
 559  * this used to be much more involved, and I'm keeping it just in case
 560  * things get ugly again.  it gets called by flush_commit_list, and
 561  * cleans up any data stored about blocks freed during a transaction.
 562  */
 563 static void cleanup_freed_for_journal_list(struct super_block *sb,
 564                                            struct reiserfs_journal_list *jl)
 565 {
 566
 567         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
 568         if (jb) {
 569                 cleanup_bitmap_list(sb, jb);
 570         }
 571         jl->j_list_bitmap->journal_list = NULL;
 572         jl->j_list_bitmap = NULL;
 573 }
 574
 575 static int journal_list_still_alive(struct super_block *s,
 576                                     unsigned int trans_id)
 577 {
 578         struct reiserfs_journal *journal = SB_JOURNAL(s);
 579         struct list_head *entry = &journal->j_journal_list;
 580         struct reiserfs_journal_list *jl;
 581
 582         if (!list_empty(entry)) {
 583                 jl = JOURNAL_LIST_ENTRY(entry->next);
 584                 if (jl->j_trans_id <= trans_id) {
 585                         return 1;
 586                 }
 587         }
 588         return 0;
 589 }
 590
 591 /*
 592  * If page->mapping was null, we failed to truncate this page for
 593  * some reason.  Most likely because it was truncated after being
 594  * logged via data=journal.
 595  *
 596  * This does a check to see if the buffer belongs to one of these
 597  * lost pages before doing the final put_bh.  If page->mapping was
 598  * null, it tries to free buffers on the page, which should make the
 599  * final put_page drop the page from the lru.
 600  */
 601 static void release_buffer_page(struct buffer_head *bh)
 602 {
 603         struct folio *folio = bh->b_folio;
 604         if (!folio->mapping && folio_trylock(folio)) {
 605                 folio_get(folio);
 606                 put_bh(bh);
 607                 if (!folio->mapping)
 608                         try_to_free_buffers(folio);
 609                 folio_unlock(folio);
 610                 folio_put(folio);
 611         } else {
 612                 put_bh(bh);
 613         }
 614 }
 615
 616 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 617 {
 618         if (buffer_journaled(bh)) {
 619                 reiserfs_warning(NULL, "clm-2084",
 620                                  "pinned buffer %lu:%pg sent to disk",
 621                                  bh->b_blocknr, bh->b_bdev);
 622         }
 623         if (uptodate)
 624                 set_buffer_uptodate(bh);
 625         else
 626                 clear_buffer_uptodate(bh);
 627
 628         unlock_buffer(bh);
 629         release_buffer_page(bh);
 630 }
 631
 632 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
 633 {
 634         if (uptodate)
 635                 set_buffer_uptodate(bh);
 636         else
 637                 clear_buffer_uptodate(bh);
 638         unlock_buffer(bh);
 639         put_bh(bh);
 640 }
 641
 642 static void submit_logged_buffer(struct buffer_head *bh)
 643 {
 644         get_bh(bh);
 645         bh->b_end_io = reiserfs_end_buffer_io_sync;
 646         clear_buffer_journal_new(bh);
 647         clear_buffer_dirty(bh);
 648         if (!test_clear_buffer_journal_test(bh))
 649                 BUG();
 650         if (!buffer_uptodate(bh))
 651                 BUG();
 652         submit_bh(REQ_OP_WRITE, bh);
 653 }
 654
 655 static void submit_ordered_buffer(struct buffer_head *bh)
 656 {
 657         get_bh(bh);
 658         bh->b_end_io = reiserfs_end_ordered_io;
 659         clear_buffer_dirty(bh);
 660         if (!buffer_uptodate(bh))
 661                 BUG();
 662         submit_bh(REQ_OP_WRITE, bh);
 663 }
 664
 665 #define CHUNK_SIZE 32
 666 struct buffer_chunk {
 667         struct buffer_head *bh[CHUNK_SIZE];
 668         int nr;
 669 };
 670
 671 static void write_chunk(struct buffer_chunk *chunk)
 672 {
 673         int i;
 674         for (i = 0; i < chunk->nr; i++) {
 675                 submit_logged_buffer(chunk->bh[i]);
 676         }
 677         chunk->nr = 0;
 678 }
 679
 680 static void write_ordered_chunk(struct buffer_chunk *chunk)
 681 {
 682         int i;
 683         for (i = 0; i < chunk->nr; i++) {
 684                 submit_ordered_buffer(chunk->bh[i]);
 685         }
 686         chunk->nr = 0;
 687 }
 688
 689 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
 690                         spinlock_t * lock, void (fn) (struct buffer_chunk *))
 691 {
 692         int ret = 0;
 693         BUG_ON(chunk->nr >= CHUNK_SIZE);
 694         chunk->bh[chunk->nr++] = bh;
 695         if (chunk->nr >= CHUNK_SIZE) {
 696                 ret = 1;
 697                 if (lock) {
 698                         spin_unlock(lock);
 699                         fn(chunk);
 700                         spin_lock(lock);
 701                 } else {
 702                         fn(chunk);
 703                 }
 704         }
 705         return ret;
 706 }
 707
 708 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
 709 static struct reiserfs_jh *alloc_jh(void)
 710 {
 711         struct reiserfs_jh *jh;
 712         while (1) {
 713                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
 714                 if (jh) {
 715                         atomic_inc(&nr_reiserfs_jh);
 716                         return jh;
 717                 }
 718                 yield();
 719         }
 720 }
 721
 722 /*
 723  * we want to free the jh when the buffer has been written
 724  * and waited on
 725  */
 726 void reiserfs_free_jh(struct buffer_head *bh)
 727 {
 728         struct reiserfs_jh *jh;
 729
 730         jh = bh->b_private;
 731         if (jh) {
 732                 bh->b_private = NULL;
 733                 jh->bh = NULL;
 734                 list_del_init(&jh->list);
 735                 kfree(jh);
 736                 if (atomic_read(&nr_reiserfs_jh) <= 0)
 737                         BUG();
 738                 atomic_dec(&nr_reiserfs_jh);
 739                 put_bh(bh);
 740         }
 741 }
 742
 743 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
 744                            int tail)
 745 {
 746         struct reiserfs_jh *jh;
 747
 748         if (bh->b_private) {
 749                 spin_lock(&j->j_dirty_buffers_lock);
 750                 if (!bh->b_private) {
 751                         spin_unlock(&j->j_dirty_buffers_lock);
 752                         goto no_jh;
 753                 }
 754                 jh = bh->b_private;
 755                 list_del_init(&jh->list);
 756         } else {
 757 no_jh:
 758                 get_bh(bh);
 759                 jh = alloc_jh();
 760                 spin_lock(&j->j_dirty_buffers_lock);
 761                 /*
 762                  * buffer must be locked for __add_jh, should be able to have
 763                  * two adds at the same time
 764                  */
 765                 BUG_ON(bh->b_private);
 766                 jh->bh = bh;
 767                 bh->b_private = jh;
 768         }
 769         jh->jl = j->j_current_jl;
 770         if (tail)
 771                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
 772         else {
 773                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
 774         }
 775         spin_unlock(&j->j_dirty_buffers_lock);
 776         return 0;
 777 }
 778
 779 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
 780 {
 781         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
 782 }
 783 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
 784 {
 785         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
 786 }
 787
 788 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
 789 static int write_ordered_buffers(spinlock_t * lock,
 790                                  struct reiserfs_journal *j,
 791                                  struct reiserfs_journal_list *jl,
 792                                  struct list_head *list)
 793 {
 794         struct buffer_head *bh;
 795         struct reiserfs_jh *jh;
 796         int ret = j->j_errno;
 797         struct buffer_chunk chunk;
 798         struct list_head tmp;
 799         INIT_LIST_HEAD(&tmp);
 800
 801         chunk.nr = 0;
 802         spin_lock(lock);
 803         while (!list_empty(list)) {
 804                 jh = JH_ENTRY(list->next);
 805                 bh = jh->bh;
 806                 get_bh(bh);
 807                 if (!trylock_buffer(bh)) {
 808                         if (!buffer_dirty(bh)) {
 809                                 list_move(&jh->list, &tmp);
 810                                 goto loop_next;
 811                         }
 812                         spin_unlock(lock);
 813                         if (chunk.nr)
 814                                 write_ordered_chunk(&chunk);
 815                         wait_on_buffer(bh);
 816                         cond_resched();
 817                         spin_lock(lock);
 818                         goto loop_next;
 819                 }
 820                 /*
 821                  * in theory, dirty non-uptodate buffers should never get here,
 822                  * but the upper layer io error paths still have a few quirks.
 823                  * Handle them here as gracefully as we can
 824                  */
 825                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
 826                         clear_buffer_dirty(bh);
 827                         ret = -EIO;
 828                 }
 829                 if (buffer_dirty(bh)) {
 830                         list_move(&jh->list, &tmp);
 831                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
 832                 } else {
 833                         reiserfs_free_jh(bh);
 834                         unlock_buffer(bh);
 835                 }
 836 loop_next:
 837                 put_bh(bh);
 838                 cond_resched_lock(lock);
 839         }
 840         if (chunk.nr) {
 841                 spin_unlock(lock);
 842                 write_ordered_chunk(&chunk);
 843                 spin_lock(lock);
 844         }
 845         while (!list_empty(&tmp)) {
 846                 jh = JH_ENTRY(tmp.prev);
 847                 bh = jh->bh;
 848                 get_bh(bh);
 849                 reiserfs_free_jh(bh);
 850
 851                 if (buffer_locked(bh)) {
 852                         spin_unlock(lock);
 853                         wait_on_buffer(bh);
 854                         spin_lock(lock);
 855                 }
 856                 if (!buffer_uptodate(bh)) {
 857                         ret = -EIO;
 858                 }
 859                 /*
 860                  * ugly interaction with invalidate_folio here.
 861                  * reiserfs_invalidate_folio will pin any buffer that has a
 862                  * valid journal head from an older transaction.  If someone
 863                  * else sets our buffer dirty after we write it in the first
 864                  * loop, and then someone truncates the page away, nobody
 865                  * will ever write the buffer. We're safe if we write the
 866                  * page one last time after freeing the journal header.
 867                  */
 868                 if (buffer_dirty(bh) && unlikely(bh->b_folio->mapping == NULL)) {
 869                         spin_unlock(lock);
 870                         write_dirty_buffer(bh, 0);
 871                         spin_lock(lock);
 872                 }
 873                 put_bh(bh);
 874                 cond_resched_lock(lock);
 875         }
 876         spin_unlock(lock);
 877         return ret;
 878 }
 879
 880 static int flush_older_commits(struct super_block *s,
 881                                struct reiserfs_journal_list *jl)
 882 {
 883         struct reiserfs_journal *journal = SB_JOURNAL(s);
 884         struct reiserfs_journal_list *other_jl;
 885         struct reiserfs_journal_list *first_jl;
 886         struct list_head *entry;
 887         unsigned int trans_id = jl->j_trans_id;
 888         unsigned int other_trans_id;
 889
 890 find_first:
 891         /*
 892          * first we walk backwards to find the oldest uncommitted transation
 893          */
 894         first_jl = jl;
 895         entry = jl->j_list.prev;
 896         while (1) {
 897                 other_jl = JOURNAL_LIST_ENTRY(entry);
 898                 if (entry == &journal->j_journal_list ||
 899                     atomic_read(&other_jl->j_older_commits_done))
 900                         break;
 901
 902                 first_jl = other_jl;
 903                 entry = other_jl->j_list.prev;
 904         }
 905
 906         /* if we didn't find any older uncommitted transactions, return now */
 907         if (first_jl == jl) {
 908                 return 0;
 909         }
 910
 911         entry = &first_jl->j_list;
 912         while (1) {
 913                 other_jl = JOURNAL_LIST_ENTRY(entry);
 914                 other_trans_id = other_jl->j_trans_id;
 915
 916                 if (other_trans_id < trans_id) {
 917                         if (atomic_read(&other_jl->j_commit_left) != 0) {
 918                                 flush_commit_list(s, other_jl, 0);
 919
 920                                 /* list we were called with is gone, return */
 921                                 if (!journal_list_still_alive(s, trans_id))
 922                                         return 1;
 923
 924                                 /*
 925                                  * the one we just flushed is gone, this means
 926                                  * all older lists are also gone, so first_jl
 927                                  * is no longer valid either.  Go back to the
 928                                  * beginning.
 929                                  */
 930                                 if (!journal_list_still_alive
 931                                     (s, other_trans_id)) {
 932                                         goto find_first;
 933                                 }
 934                         }
 935                         entry = entry->next;
 936                         if (entry == &journal->j_journal_list)
 937                                 return 0;
 938                 } else {
 939                         return 0;
 940                 }
 941         }
 942         return 0;
 943 }
 944
 945 static int reiserfs_async_progress_wait(struct super_block *s)
 946 {
 947         struct reiserfs_journal *j = SB_JOURNAL(s);
 948
 949         if (atomic_read(&j->j_async_throttle)) {
 950                 int depth;
 951
 952                 depth = reiserfs_write_unlock_nested(s);
 953                 wait_var_event_timeout(&j->j_async_throttle,
 954                                        atomic_read(&j->j_async_throttle) == 0,
 955                                        HZ / 10);
 956                 reiserfs_write_lock_nested(s, depth);
 957         }
 958
 959         return 0;
 960 }
 961
 962 /*
 963  * if this journal list still has commit blocks unflushed, send them to disk.
 964  *
 965  * log areas must be flushed in order (transaction 2 can't commit before
 966  * transaction 1) Before the commit block can by written, every other log
 967  * block must be safely on disk
 968  */
 969 static int flush_commit_list(struct super_block *s,
 970                              struct reiserfs_journal_list *jl, int flushall)
 971 {
 972         int i;
 973         b_blocknr_t bn;
 974         struct buffer_head *tbh = NULL;
 975         unsigned int trans_id = jl->j_trans_id;
 976         struct reiserfs_journal *journal = SB_JOURNAL(s);
 977         int retval = 0;
 978         int write_len;
 979         int depth;
 980
 981         reiserfs_check_lock_depth(s, "flush_commit_list");
 982
 983         if (atomic_read(&jl->j_older_commits_done)) {
 984                 return 0;
 985         }
 986
 987         /*
 988          * before we can put our commit blocks on disk, we have to make
 989          * sure everyone older than us is on disk too
 990          */
 991         BUG_ON(jl->j_len <= 0);
 992         BUG_ON(trans_id == journal->j_trans_id);
 993
 994         get_journal_list(jl);
 995         if (flushall) {
 996                 if (flush_older_commits(s, jl) == 1) {
 997                         /*
 998                          * list disappeared during flush_older_commits.
 999                          * return
1000                          */
1001                         goto put_jl;
1002                 }
1003         }
1004
1005         /* make sure nobody is trying to flush this one at the same time */
1006         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1007
1008         if (!journal_list_still_alive(s, trans_id)) {
1009                 mutex_unlock(&jl->j_commit_mutex);
1010                 goto put_jl;
1011         }
1012         BUG_ON(jl->j_trans_id == 0);
1013
1014         /* this commit is done, exit */
1015         if (atomic_read(&jl->j_commit_left) <= 0) {
1016                 if (flushall) {
1017                         atomic_set(&jl->j_older_commits_done, 1);
1018                 }
1019                 mutex_unlock(&jl->j_commit_mutex);
1020                 goto put_jl;
1021         }
1022
1023         if (!list_empty(&jl->j_bh_list)) {
1024                 int ret;
1025
1026                 /*
1027                  * We might sleep in numerous places inside
1028                  * write_ordered_buffers. Relax the write lock.
1029                  */
1030                 depth = reiserfs_write_unlock_nested(s);
1031                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1032                                             journal, jl, &jl->j_bh_list);
1033                 if (ret < 0 && retval == 0)
1034                         retval = ret;
1035                 reiserfs_write_lock_nested(s, depth);
1036         }
1037         BUG_ON(!list_empty(&jl->j_bh_list));
1038         /*
1039          * for the description block and all the log blocks, submit any buffers
1040          * that haven't already reached the disk.  Try to write at least 256
1041          * log blocks. later on, we will only wait on blocks that correspond
1042          * to this transaction, but while we're unplugging we might as well
1043          * get a chunk of data on there.
1044          */
1045         atomic_inc(&journal->j_async_throttle);
1046         write_len = jl->j_len + 1;
1047         if (write_len < 256)
1048                 write_len = 256;
1049         for (i = 0 ; i < write_len ; i++) {
1050                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1051                     SB_ONDISK_JOURNAL_SIZE(s);
1052                 tbh = journal_find_get_block(s, bn);
1053                 if (tbh) {
1054                         if (buffer_dirty(tbh)) {
1055                             depth = reiserfs_write_unlock_nested(s);
1056                             write_dirty_buffer(tbh, 0);
1057                             reiserfs_write_lock_nested(s, depth);
1058                         }
1059                         put_bh(tbh) ;
1060                 }
1061         }
1062         if (atomic_dec_and_test(&journal->j_async_throttle))
1063                 wake_up_var(&journal->j_async_throttle);
1064
1065         for (i = 0; i < (jl->j_len + 1); i++) {
1066                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1067                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1068                 tbh = journal_find_get_block(s, bn);
1069
1070                 depth = reiserfs_write_unlock_nested(s);
1071                 __wait_on_buffer(tbh);
1072                 reiserfs_write_lock_nested(s, depth);
1073                 /*
1074                  * since we're using ll_rw_blk above, it might have skipped
1075                  * over a locked buffer.  Double check here
1076                  */
1077                 /* redundant, sync_dirty_buffer() checks */
1078                 if (buffer_dirty(tbh)) {
1079                         depth = reiserfs_write_unlock_nested(s);
1080                         sync_dirty_buffer(tbh);
1081                         reiserfs_write_lock_nested(s, depth);
1082                 }
1083                 if (unlikely(!buffer_uptodate(tbh))) {
1084 #ifdef CONFIG_REISERFS_CHECK
1085                         reiserfs_warning(s, "journal-601",
1086                                          "buffer write failed");
1087 #endif
1088                         retval = -EIO;
1089                 }
1090                 /* once for journal_find_get_block */
1091                 put_bh(tbh);
1092                 /* once due to original getblk in do_journal_end */
1093                 put_bh(tbh);
1094                 atomic_dec(&jl->j_commit_left);
1095         }
1096
1097         BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1098
1099         /*
1100          * If there was a write error in the journal - we can't commit
1101          * this transaction - it will be invalid and, if successful,
1102          * will just end up propagating the write error out to
1103          * the file system.
1104          */
1105         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1106                 if (buffer_dirty(jl->j_commit_bh))
1107                         BUG();
1108                 mark_buffer_dirty(jl->j_commit_bh) ;
1109                 depth = reiserfs_write_unlock_nested(s);
1110                 if (reiserfs_barrier_flush(s))
1111                         __sync_dirty_buffer(jl->j_commit_bh,
1112                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1113                 else
1114                         sync_dirty_buffer(jl->j_commit_bh);
1115                 reiserfs_write_lock_nested(s, depth);
1116         }
1117
1118         /*
1119          * If there was a write error in the journal - we can't commit this
1120          * transaction - it will be invalid and, if successful, will just end
1121          * up propagating the write error out to the filesystem.
1122          */
1123         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1124 #ifdef CONFIG_REISERFS_CHECK
1125                 reiserfs_warning(s, "journal-615", "buffer write failed");
1126 #endif
1127                 retval = -EIO;
1128         }
1129         bforget(jl->j_commit_bh);
1130         if (journal->j_last_commit_id != 0 &&
1131             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1132                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1133                                  journal->j_last_commit_id, jl->j_trans_id);
1134         }
1135         journal->j_last_commit_id = jl->j_trans_id;
1136
1137         /*
1138          * now, every commit block is on the disk.  It is safe to allow
1139          * blocks freed during this transaction to be reallocated
1140          */
1141         cleanup_freed_for_journal_list(s, jl);
1142
1143         retval = retval ? retval : journal->j_errno;
1144
1145         /* mark the metadata dirty */
1146         if (!retval)
1147                 dirty_one_transaction(s, jl);
1148         atomic_dec(&jl->j_commit_left);
1149
1150         if (flushall) {
1151                 atomic_set(&jl->j_older_commits_done, 1);
1152         }
1153         mutex_unlock(&jl->j_commit_mutex);
1154 put_jl:
1155         put_journal_list(s, jl);
1156
1157         if (retval)
1158                 reiserfs_abort(s, retval, "Journal write error in %s",
1159                                __func__);
1160         return retval;
1161 }
1162
1163 /*
1164  * flush_journal_list frequently needs to find a newer transaction for a
1165  * given block.  This does that, or returns NULL if it can't find anything
1166  */
1167 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1168                                                           reiserfs_journal_cnode
1169                                                           *cn)
1170 {
1171         struct super_block *sb = cn->sb;
1172         b_blocknr_t blocknr = cn->blocknr;
1173
1174         cn = cn->hprev;
1175         while (cn) {
1176                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1177                         return cn->jlist;
1178                 }
1179                 cn = cn->hprev;
1180         }
1181         return NULL;
1182 }
1183
1184 static void remove_journal_hash(struct super_block *,
1185                                 struct reiserfs_journal_cnode **,
1186                                 struct reiserfs_journal_list *, unsigned long,
1187                                 int);
1188
1189 /*
1190  * once all the real blocks have been flushed, it is safe to remove them
1191  * from the journal list for this transaction.  Aside from freeing the
1192  * cnode, this also allows the block to be reallocated for data blocks
1193  * if it had been deleted.
1194  */
1195 static void remove_all_from_journal_list(struct super_block *sb,
1196                                          struct reiserfs_journal_list *jl,
1197                                          int debug)
1198 {
1199         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1200         struct reiserfs_journal_cnode *cn, *last;
1201         cn = jl->j_realblock;
1202
1203         /*
1204          * which is better, to lock once around the whole loop, or
1205          * to lock for each call to remove_journal_hash?
1206          */
1207         while (cn) {
1208                 if (cn->blocknr != 0) {
1209                         if (debug) {
1210                                 reiserfs_warning(sb, "reiserfs-2201",
1211                                                  "block %u, bh is %d, state %ld",
1212                                                  cn->blocknr, cn->bh ? 1 : 0,
1213                                                  cn->state);
1214                         }
1215                         cn->state = 0;
1216                         remove_journal_hash(sb, journal->j_list_hash_table,
1217                                             jl, cn->blocknr, 1);
1218                 }
1219                 last = cn;
1220                 cn = cn->next;
1221                 free_cnode(sb, last);
1222         }
1223         jl->j_realblock = NULL;
1224 }
1225
1226 /*
1227  * if this timestamp is greater than the timestamp we wrote last to the
1228  * header block, write it to the header block.  once this is done, I can
1229  * safely say the log area for this transaction won't ever be replayed,
1230  * and I can start releasing blocks in this transaction for reuse as data
1231  * blocks.  called by flush_journal_list, before it calls
1232  * remove_all_from_journal_list
1233  */
1234 static int _update_journal_header_block(struct super_block *sb,
1235                                         unsigned long offset,
1236                                         unsigned int trans_id)
1237 {
1238         struct reiserfs_journal_header *jh;
1239         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1240         int depth;
1241
1242         if (reiserfs_is_journal_aborted(journal))
1243                 return -EIO;
1244
1245         if (trans_id >= journal->j_last_flush_trans_id) {
1246                 if (buffer_locked((journal->j_header_bh))) {
1247                         depth = reiserfs_write_unlock_nested(sb);
1248                         __wait_on_buffer(journal->j_header_bh);
1249                         reiserfs_write_lock_nested(sb, depth);
1250                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1251 #ifdef CONFIG_REISERFS_CHECK
1252                                 reiserfs_warning(sb, "journal-699",
1253                                                  "buffer write failed");
1254 #endif
1255                                 return -EIO;
1256                         }
1257                 }
1258                 journal->j_last_flush_trans_id = trans_id;
1259                 journal->j_first_unflushed_offset = offset;
1260                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1261                                                         b_data);
1262                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1263                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1264                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1265
1266                 set_buffer_dirty(journal->j_header_bh);
1267                 depth = reiserfs_write_unlock_nested(sb);
1268
1269                 if (reiserfs_barrier_flush(sb))
1270                         __sync_dirty_buffer(journal->j_header_bh,
1271                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1272                 else
1273                         sync_dirty_buffer(journal->j_header_bh);
1274
1275                 reiserfs_write_lock_nested(sb, depth);
1276                 if (!buffer_uptodate(journal->j_header_bh)) {
1277                         reiserfs_warning(sb, "journal-837",
1278                                          "IO error during journal replay");
1279                         return -EIO;
1280                 }
1281         }
1282         return 0;
1283 }
1284
1285 static int update_journal_header_block(struct super_block *sb,
1286                                        unsigned long offset,
1287                                        unsigned int trans_id)
1288 {
1289         return _update_journal_header_block(sb, offset, trans_id);
1290 }
1291
1292 /*
1293 ** flush any and all journal lists older than you are
1294 ** can only be called from flush_journal_list
1295 */
1296 static int flush_older_journal_lists(struct super_block *sb,
1297                                      struct reiserfs_journal_list *jl)
1298 {
1299         struct list_head *entry;
1300         struct reiserfs_journal_list *other_jl;
1301         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1302         unsigned int trans_id = jl->j_trans_id;
1303
1304         /*
1305          * we know we are the only ones flushing things, no extra race
1306          * protection is required.
1307          */
1308 restart:
1309         entry = journal->j_journal_list.next;
1310         /* Did we wrap? */
1311         if (entry == &journal->j_journal_list)
1312                 return 0;
1313         other_jl = JOURNAL_LIST_ENTRY(entry);
1314         if (other_jl->j_trans_id < trans_id) {
1315                 BUG_ON(other_jl->j_refcount <= 0);
1316                 /* do not flush all */
1317                 flush_journal_list(sb, other_jl, 0);
1318
1319                 /* other_jl is now deleted from the list */
1320                 goto restart;
1321         }
1322         return 0;
1323 }
1324
1325 static void del_from_work_list(struct super_block *s,
1326                                struct reiserfs_journal_list *jl)
1327 {
1328         struct reiserfs_journal *journal = SB_JOURNAL(s);
1329         if (!list_empty(&jl->j_working_list)) {
1330                 list_del_init(&jl->j_working_list);
1331                 journal->j_num_work_lists--;
1332         }
1333 }
1334
1335 /*
1336  * flush a journal list, both commit and real blocks
1337  *
1338  * always set flushall to 1, unless you are calling from inside
1339  * flush_journal_list
1340  *
1341  * IMPORTANT.  This can only be called while there are no journal writers,
1342  * and the journal is locked.  That means it can only be called from
1343  * do_journal_end, or by journal_release
1344  */
1345 static int flush_journal_list(struct super_block *s,
1346                               struct reiserfs_journal_list *jl, int flushall)
1347 {
1348         struct reiserfs_journal_list *pjl;
1349         struct reiserfs_journal_cnode *cn;
1350         int count;
1351         int was_jwait = 0;
1352         int was_dirty = 0;
1353         struct buffer_head *saved_bh;
1354         unsigned long j_len_saved = jl->j_len;
1355         struct reiserfs_journal *journal = SB_JOURNAL(s);
1356         int err = 0;
1357         int depth;
1358
1359         BUG_ON(j_len_saved <= 0);
1360
1361         if (atomic_read(&journal->j_wcount) != 0) {
1362                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1363                                  atomic_read(&journal->j_wcount));
1364         }
1365
1366         /* if flushall == 0, the lock is already held */
1367         if (flushall) {
1368                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1369         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1370                 BUG();
1371         }
1372
1373         count = 0;
1374         if (j_len_saved > journal->j_trans_max) {
1375                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1376                                j_len_saved, jl->j_trans_id);
1377                 return 0;
1378         }
1379
1380         /* if all the work is already done, get out of here */
1381         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1382             atomic_read(&jl->j_commit_left) <= 0) {
1383                 goto flush_older_and_return;
1384         }
1385
1386         /*
1387          * start by putting the commit list on disk.  This will also flush
1388          * the commit lists of any olders transactions
1389          */
1390         flush_commit_list(s, jl, 1);
1391
1392         if (!(jl->j_state & LIST_DIRTY)
1393             && !reiserfs_is_journal_aborted(journal))
1394                 BUG();
1395
1396         /* are we done now? */
1397         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1398             atomic_read(&jl->j_commit_left) <= 0) {
1399                 goto flush_older_and_return;
1400         }
1401
1402         /*
1403          * loop through each cnode, see if we need to write it,
1404          * or wait on a more recent transaction, or just ignore it
1405          */
1406         if (atomic_read(&journal->j_wcount) != 0) {
1407                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1408                                "wcount is not 0");
1409         }
1410         cn = jl->j_realblock;
1411         while (cn) {
1412                 was_jwait = 0;
1413                 was_dirty = 0;
1414                 saved_bh = NULL;
1415                 /* blocknr of 0 is no longer in the hash, ignore it */
1416                 if (cn->blocknr == 0) {
1417                         goto free_cnode;
1418                 }
1419
1420                 /*
1421                  * This transaction failed commit.
1422                  * Don't write out to the disk
1423                  */
1424                 if (!(jl->j_state & LIST_DIRTY))
1425                         goto free_cnode;
1426
1427                 pjl = find_newer_jl_for_cn(cn);
1428                 /*
1429                  * the order is important here.  We check pjl to make sure we
1430                  * don't clear BH_JDirty_wait if we aren't the one writing this
1431                  * block to disk
1432                  */
1433                 if (!pjl && cn->bh) {
1434                         saved_bh = cn->bh;
1435
1436                         /*
1437                          * we do this to make sure nobody releases the
1438                          * buffer while we are working with it
1439                          */
1440                         get_bh(saved_bh);
1441
1442                         if (buffer_journal_dirty(saved_bh)) {
1443                                 BUG_ON(!can_dirty(cn));
1444                                 was_jwait = 1;
1445                                 was_dirty = 1;
1446                         } else if (can_dirty(cn)) {
1447                                 /*
1448                                  * everything with !pjl && jwait
1449                                  * should be writable
1450                                  */
1451                                 BUG();
1452                         }
1453                 }
1454
1455                 /*
1456                  * if someone has this block in a newer transaction, just make
1457                  * sure they are committed, and don't try writing it to disk
1458                  */
1459                 if (pjl) {
1460                         if (atomic_read(&pjl->j_commit_left))
1461                                 flush_commit_list(s, pjl, 1);
1462                         goto free_cnode;
1463                 }
1464
1465                 /*
1466                  * bh == NULL when the block got to disk on its own, OR,
1467                  * the block got freed in a future transaction
1468                  */
1469                 if (saved_bh == NULL) {
1470                         goto free_cnode;
1471                 }
1472
1473                 /*
1474                  * this should never happen.  kupdate_one_transaction has
1475                  * this list locked while it works, so we should never see a
1476                  * buffer here that is not marked JDirty_wait
1477                  */
1478                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1479                         reiserfs_warning(s, "journal-813",
1480                                          "BAD! buffer %llu %cdirty %cjwait, "
1481                                          "not in a newer transaction",
1482                                          (unsigned long long)saved_bh->
1483                                          b_blocknr, was_dirty ? ' ' : '!',
1484                                          was_jwait ? ' ' : '!');
1485                 }
1486                 if (was_dirty) {
1487                         /*
1488                          * we inc again because saved_bh gets decremented
1489                          * at free_cnode
1490                          */
1491                         get_bh(saved_bh);
1492                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1493                         lock_buffer(saved_bh);
1494                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1495                         if (buffer_dirty(saved_bh))
1496                                 submit_logged_buffer(saved_bh);
1497                         else
1498                                 unlock_buffer(saved_bh);
1499                         count++;
1500                 } else {
1501                         reiserfs_warning(s, "clm-2082",
1502                                          "Unable to flush buffer %llu in %s",
1503                                          (unsigned long long)saved_bh->
1504                                          b_blocknr, __func__);
1505                 }
1506 free_cnode:
1507                 cn = cn->next;
1508                 if (saved_bh) {
1509                         /*
1510                          * we incremented this to keep others from
1511                          * taking the buffer head away
1512                          */
1513                         put_bh(saved_bh);
1514                         if (atomic_read(&saved_bh->b_count) < 0) {
1515                                 reiserfs_warning(s, "journal-945",
1516                                                  "saved_bh->b_count < 0");
1517                         }
1518                 }
1519         }
1520         if (count > 0) {
1521                 cn = jl->j_realblock;
1522                 while (cn) {
1523                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1524                                 if (!cn->bh) {
1525                                         reiserfs_panic(s, "journal-1011",
1526                                                        "cn->bh is NULL");
1527                                 }
1528
1529                                 depth = reiserfs_write_unlock_nested(s);
1530                                 __wait_on_buffer(cn->bh);
1531                                 reiserfs_write_lock_nested(s, depth);
1532
1533                                 if (!cn->bh) {
1534                                         reiserfs_panic(s, "journal-1012",
1535                                                        "cn->bh is NULL");
1536                                 }
1537                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1538 #ifdef CONFIG_REISERFS_CHECK
1539                                         reiserfs_warning(s, "journal-949",
1540                                                          "buffer write failed");
1541 #endif
1542                                         err = -EIO;
1543                                 }
1544                                 /*
1545                                  * note, we must clear the JDirty_wait bit
1546                                  * after the up to date check, otherwise we
1547                                  * race against our flushpage routine
1548                                  */
1549                                 BUG_ON(!test_clear_buffer_journal_dirty
1550                                        (cn->bh));
1551
1552                                 /* drop one ref for us */
1553                                 put_bh(cn->bh);
1554                                 /* drop one ref for journal_mark_dirty */
1555                                 release_buffer_page(cn->bh);
1556                         }
1557                         cn = cn->next;
1558                 }
1559         }
1560
1561         if (err)
1562                 reiserfs_abort(s, -EIO,
1563                                "Write error while pushing transaction to disk in %s",
1564                                __func__);
1565 flush_older_and_return:
1566
1567         /*
1568          * before we can update the journal header block, we _must_ flush all
1569          * real blocks from all older transactions to disk.  This is because
1570          * once the header block is updated, this transaction will not be
1571          * replayed after a crash
1572          */
1573         if (flushall) {
1574                 flush_older_journal_lists(s, jl);
1575         }
1576
1577         err = journal->j_errno;
1578         /*
1579          * before we can remove everything from the hash tables for this
1580          * transaction, we must make sure it can never be replayed
1581          *
1582          * since we are only called from do_journal_end, we know for sure there
1583          * are no allocations going on while we are flushing journal lists.  So,
1584          * we only need to update the journal header block for the last list
1585          * being flushed
1586          */
1587         if (!err && flushall) {
1588                 err =
1589                     update_journal_header_block(s,
1590                                                 (jl->j_start + jl->j_len +
1591                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1592                                                 jl->j_trans_id);
1593                 if (err)
1594                         reiserfs_abort(s, -EIO,
1595                                        "Write error while updating journal header in %s",
1596                                        __func__);
1597         }
1598         remove_all_from_journal_list(s, jl, 0);
1599         list_del_init(&jl->j_list);
1600         journal->j_num_lists--;
1601         del_from_work_list(s, jl);
1602
1603         if (journal->j_last_flush_id != 0 &&
1604             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1605                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1606                                  journal->j_last_flush_id, jl->j_trans_id);
1607         }
1608         journal->j_last_flush_id = jl->j_trans_id;
1609
1610         /*
1611          * not strictly required since we are freeing the list, but it should
1612          * help find code using dead lists later on
1613          */
1614         jl->j_len = 0;
1615         atomic_set(&jl->j_nonzerolen, 0);
1616         jl->j_start = 0;
1617         jl->j_realblock = NULL;
1618         jl->j_commit_bh = NULL;
1619         jl->j_trans_id = 0;
1620         jl->j_state = 0;
1621         put_journal_list(s, jl);
1622         if (flushall)
1623                 mutex_unlock(&journal->j_flush_mutex);
1624         return err;
1625 }
1626
1627 static int write_one_transaction(struct super_block *s,
1628                                  struct reiserfs_journal_list *jl,
1629                                  struct buffer_chunk *chunk)
1630 {
1631         struct reiserfs_journal_cnode *cn;
1632         int ret = 0;
1633
1634         jl->j_state |= LIST_TOUCHED;
1635         del_from_work_list(s, jl);
1636         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1637                 return 0;
1638         }
1639
1640         cn = jl->j_realblock;
1641         while (cn) {
1642                 /*
1643                  * if the blocknr == 0, this has been cleared from the hash,
1644                  * skip it
1645                  */
1646                 if (cn->blocknr == 0) {
1647                         goto next;
1648                 }
1649                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1650                         struct buffer_head *tmp_bh;
1651                         /*
1652                          * we can race against journal_mark_freed when we try
1653                          * to lock_buffer(cn->bh), so we have to inc the buffer
1654                          * count, and recheck things after locking
1655                          */
1656                         tmp_bh = cn->bh;
1657                         get_bh(tmp_bh);
1658                         lock_buffer(tmp_bh);
1659                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1660                                 if (!buffer_journal_dirty(tmp_bh) ||
1661                                     buffer_journal_prepared(tmp_bh))
1662                                         BUG();
1663                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1664                                 ret++;
1665                         } else {
1666                                 /* note, cn->bh might be null now */
1667                                 unlock_buffer(tmp_bh);
1668                         }
1669                         put_bh(tmp_bh);
1670                 }
1671 next:
1672                 cn = cn->next;
1673                 cond_resched();
1674         }
1675         return ret;
1676 }
1677
1678 /* used by flush_commit_list */
1679 static void dirty_one_transaction(struct super_block *s,
1680                                  struct reiserfs_journal_list *jl)
1681 {
1682         struct reiserfs_journal_cnode *cn;
1683         struct reiserfs_journal_list *pjl;
1684
1685         jl->j_state |= LIST_DIRTY;
1686         cn = jl->j_realblock;
1687         while (cn) {
1688                 /*
1689                  * look for a more recent transaction that logged this
1690                  * buffer.  Only the most recent transaction with a buffer in
1691                  * it is allowed to send that buffer to disk
1692                  */
1693                 pjl = find_newer_jl_for_cn(cn);
1694                 if (!pjl && cn->blocknr && cn->bh
1695                     && buffer_journal_dirty(cn->bh)) {
1696                         BUG_ON(!can_dirty(cn));
1697                         /*
1698                          * if the buffer is prepared, it will either be logged
1699                          * or restored.  If restored, we need to make sure
1700                          * it actually gets marked dirty
1701                          */
1702                         clear_buffer_journal_new(cn->bh);
1703                         if (buffer_journal_prepared(cn->bh)) {
1704                                 set_buffer_journal_restore_dirty(cn->bh);
1705                         } else {
1706                                 set_buffer_journal_test(cn->bh);
1707                                 mark_buffer_dirty(cn->bh);
1708                         }
1709                 }
1710                 cn = cn->next;
1711         }
1712 }
1713
1714 static int kupdate_transactions(struct super_block *s,
1715                                 struct reiserfs_journal_list *jl,
1716                                 struct reiserfs_journal_list **next_jl,
1717                                 unsigned int *next_trans_id,
1718                                 int num_blocks, int num_trans)
1719 {
1720         int ret = 0;
1721         int written = 0;
1722         int transactions_flushed = 0;
1723         unsigned int orig_trans_id = jl->j_trans_id;
1724         struct buffer_chunk chunk;
1725         struct list_head *entry;
1726         struct reiserfs_journal *journal = SB_JOURNAL(s);
1727         chunk.nr = 0;
1728
1729         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1730         if (!journal_list_still_alive(s, orig_trans_id)) {
1731                 goto done;
1732         }
1733
1734         /*
1735          * we've got j_flush_mutex held, nobody is going to delete any
1736          * of these lists out from underneath us
1737          */
1738         while ((num_trans && transactions_flushed < num_trans) ||
1739                (!num_trans && written < num_blocks)) {
1740
1741                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1742                     atomic_read(&jl->j_commit_left)
1743                     || !(jl->j_state & LIST_DIRTY)) {
1744                         del_from_work_list(s, jl);
1745                         break;
1746                 }
1747                 ret = write_one_transaction(s, jl, &chunk);
1748
1749                 if (ret < 0)
1750                         goto done;
1751                 transactions_flushed++;
1752                 written += ret;
1753                 entry = jl->j_list.next;
1754
1755                 /* did we wrap? */
1756                 if (entry == &journal->j_journal_list) {
1757                         break;
1758                 }
1759                 jl = JOURNAL_LIST_ENTRY(entry);
1760
1761                 /* don't bother with older transactions */
1762                 if (jl->j_trans_id <= orig_trans_id)
1763                         break;
1764         }
1765         if (chunk.nr) {
1766                 write_chunk(&chunk);
1767         }
1768
1769 done:
1770         mutex_unlock(&journal->j_flush_mutex);
1771         return ret;
1772 }
1773
1774 /*
1775  * for o_sync and fsync heavy applications, they tend to use
1776  * all the journa list slots with tiny transactions.  These
1777  * trigger lots and lots of calls to update the header block, which
1778  * adds seeks and slows things down.
1779  *
1780  * This function tries to clear out a large chunk of the journal lists
1781  * at once, which makes everything faster since only the newest journal
1782  * list updates the header block
1783  */
1784 static int flush_used_journal_lists(struct super_block *s,
1785                                     struct reiserfs_journal_list *jl)
1786 {
1787         unsigned long len = 0;
1788         unsigned long cur_len;
1789         int i;
1790         int limit = 256;
1791         struct reiserfs_journal_list *tjl;
1792         struct reiserfs_journal_list *flush_jl;
1793         unsigned int trans_id;
1794         struct reiserfs_journal *journal = SB_JOURNAL(s);
1795
1796         flush_jl = tjl = jl;
1797
1798         /* in data logging mode, try harder to flush a lot of blocks */
1799         if (reiserfs_data_log(s))
1800                 limit = 1024;
1801         /* flush for 256 transactions or limit blocks, whichever comes first */
1802         for (i = 0; i < 256 && len < limit; i++) {
1803                 if (atomic_read(&tjl->j_commit_left) ||
1804                     tjl->j_trans_id < jl->j_trans_id) {
1805                         break;
1806                 }
1807                 cur_len = atomic_read(&tjl->j_nonzerolen);
1808                 if (cur_len > 0) {
1809                         tjl->j_state &= ~LIST_TOUCHED;
1810                 }
1811                 len += cur_len;
1812                 flush_jl = tjl;
1813                 if (tjl->j_list.next == &journal->j_journal_list)
1814                         break;
1815                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1816         }
1817         get_journal_list(jl);
1818         get_journal_list(flush_jl);
1819
1820         /*
1821          * try to find a group of blocks we can flush across all the
1822          * transactions, but only bother if we've actually spanned
1823          * across multiple lists
1824          */
1825         if (flush_jl != jl)
1826                 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1827
1828         flush_journal_list(s, flush_jl, 1);
1829         put_journal_list(s, flush_jl);
1830         put_journal_list(s, jl);
1831         return 0;
1832 }
1833
1834 /*
1835  * removes any nodes in table with name block and dev as bh.
1836  * only touchs the hnext and hprev pointers.
1837  */
1838 static void remove_journal_hash(struct super_block *sb,
1839                          struct reiserfs_journal_cnode **table,
1840                          struct reiserfs_journal_list *jl,
1841                          unsigned long block, int remove_freed)
1842 {
1843         struct reiserfs_journal_cnode *cur;
1844         struct reiserfs_journal_cnode **head;
1845
1846         head = &(journal_hash(table, sb, block));
1847         if (!head) {
1848                 return;
1849         }
1850         cur = *head;
1851         while (cur) {
1852                 if (cur->blocknr == block && cur->sb == sb
1853                     && (jl == NULL || jl == cur->jlist)
1854                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1855                         if (cur->hnext) {
1856                                 cur->hnext->hprev = cur->hprev;
1857                         }
1858                         if (cur->hprev) {
1859                                 cur->hprev->hnext = cur->hnext;
1860                         } else {
1861                                 *head = cur->hnext;
1862                         }
1863                         cur->blocknr = 0;
1864                         cur->sb = NULL;
1865                         cur->state = 0;
1866                         /*
1867                          * anybody who clears the cur->bh will also
1868                          * dec the nonzerolen
1869                          */
1870                         if (cur->bh && cur->jlist)
1871                                 atomic_dec(&cur->jlist->j_nonzerolen);
1872                         cur->bh = NULL;
1873                         cur->jlist = NULL;
1874                 }
1875                 cur = cur->hnext;
1876         }
1877 }
1878
1879 static void free_journal_ram(struct super_block *sb)
1880 {
1881         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1882         kfree(journal->j_current_jl);
1883         journal->j_num_lists--;
1884
1885         vfree(journal->j_cnode_free_orig);
1886         free_list_bitmaps(sb, journal->j_list_bitmap);
1887         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1888         if (journal->j_header_bh) {
1889                 brelse(journal->j_header_bh);
1890         }
1891         /*
1892          * j_header_bh is on the journal dev, make sure
1893          * not to release the journal dev until we brelse j_header_bh
1894          */
1895         release_journal_dev(journal);
1896         vfree(journal);
1897 }
1898
1899 /*
1900  * call on unmount.  Only set error to 1 if you haven't made your way out
1901  * of read_super() yet.  Any other caller must keep error at 0.
1902  */
1903 static int do_journal_release(struct reiserfs_transaction_handle *th,
1904                               struct super_block *sb, int error)
1905 {
1906         struct reiserfs_transaction_handle myth;
1907         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1908
1909         /*
1910          * we only want to flush out transactions if we were
1911          * called with error == 0
1912          */
1913         if (!error && !sb_rdonly(sb)) {
1914                 /* end the current trans */
1915                 BUG_ON(!th->t_trans_id);
1916                 do_journal_end(th, FLUSH_ALL);
1917
1918                 /*
1919                  * make sure something gets logged to force
1920                  * our way into the flush code
1921                  */
1922                 if (!journal_join(&myth, sb)) {
1923                         reiserfs_prepare_for_journal(sb,
1924                                                      SB_BUFFER_WITH_SB(sb),
1925                                                      1);
1926                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1927                         do_journal_end(&myth, FLUSH_ALL);
1928                 }
1929         }
1930
1931         /* this also catches errors during the do_journal_end above */
1932         if (!error && reiserfs_is_journal_aborted(journal)) {
1933                 memset(&myth, 0, sizeof(myth));
1934                 if (!journal_join_abort(&myth, sb)) {
1935                         reiserfs_prepare_for_journal(sb,
1936                                                      SB_BUFFER_WITH_SB(sb),
1937                                                      1);
1938                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1939                         do_journal_end(&myth, FLUSH_ALL);
1940                 }
1941         }
1942
1943
1944         /*
1945          * We must release the write lock here because
1946          * the workqueue job (flush_async_commit) needs this lock
1947          */
1948         reiserfs_write_unlock(sb);
1949
1950         /*
1951          * Cancel flushing of old commits. Note that neither of these works
1952          * will be requeued because superblock is being shutdown and doesn't
1953          * have SB_ACTIVE set.
1954          */
1955         reiserfs_cancel_old_flush(sb);
1956         /* wait for all commits to finish */
1957         cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1958
1959         free_journal_ram(sb);
1960
1961         reiserfs_write_lock(sb);
1962
1963         return 0;
1964 }
1965
1966 /* * call on unmount.  flush all journal trans, release all alloc'd ram */
1967 int journal_release(struct reiserfs_transaction_handle *th,
1968                     struct super_block *sb)
1969 {
1970         return do_journal_release(th, sb, 0);
1971 }
1972
1973 /* only call from an error condition inside reiserfs_read_super!  */
1974 int journal_release_error(struct reiserfs_transaction_handle *th,
1975                           struct super_block *sb)
1976 {
1977         return do_journal_release(th, sb, 1);
1978 }
1979
1980 /*
1981  * compares description block with commit block.
1982  * returns 1 if they differ, 0 if they are the same
1983  */
1984 static int journal_compare_desc_commit(struct super_block *sb,
1985                                        struct reiserfs_journal_desc *desc,
1986                                        struct reiserfs_journal_commit *commit)
1987 {
1988         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1989             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1990             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1991             get_commit_trans_len(commit) <= 0) {
1992                 return 1;
1993         }
1994         return 0;
1995 }
1996
1997 /*
1998  * returns 0 if it did not find a description block
1999  * returns -1 if it found a corrupt commit block
2000  * returns 1 if both desc and commit were valid
2001  * NOTE: only called during fs mount
2002  */
2003 static int journal_transaction_is_valid(struct super_block *sb,
2004                                         struct buffer_head *d_bh,
2005                                         unsigned int *oldest_invalid_trans_id,
2006                                         unsigned long *newest_mount_id)
2007 {
2008         struct reiserfs_journal_desc *desc;
2009         struct reiserfs_journal_commit *commit;
2010         struct buffer_head *c_bh;
2011         unsigned long offset;
2012
2013         if (!d_bh)
2014                 return 0;
2015
2016         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2017         if (get_desc_trans_len(desc) > 0
2018             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2019                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2020                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2021                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2022                                        "journal-986: transaction "
2023                                        "is valid returning because trans_id %d is greater than "
2024                                        "oldest_invalid %lu",
2025                                        get_desc_trans_id(desc),
2026                                        *oldest_invalid_trans_id);
2027                         return 0;
2028                 }
2029                 if (newest_mount_id
2030                     && *newest_mount_id > get_desc_mount_id(desc)) {
2031                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2032                                        "journal-1087: transaction "
2033                                        "is valid returning because mount_id %d is less than "
2034                                        "newest_mount_id %lu",
2035                                        get_desc_mount_id(desc),
2036                                        *newest_mount_id);
2037                         return -1;
2038                 }
2039                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2040                         reiserfs_warning(sb, "journal-2018",
2041                                          "Bad transaction length %d "
2042                                          "encountered, ignoring transaction",
2043                                          get_desc_trans_len(desc));
2044                         return -1;
2045                 }
2046                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2047
2048                 /*
2049                  * ok, we have a journal description block,
2050                  * let's see if the transaction was valid
2051                  */
2052                 c_bh =
2053                     journal_bread(sb,
2054                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2055                                   ((offset + get_desc_trans_len(desc) +
2056                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2057                 if (!c_bh)
2058                         return 0;
2059                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2060                 if (journal_compare_desc_commit(sb, desc, commit)) {
2061                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2062                                        "journal_transaction_is_valid, commit offset %ld had bad "
2063                                        "time %d or length %d",
2064                                        c_bh->b_blocknr -
2065                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2066                                        get_commit_trans_id(commit),
2067                                        get_commit_trans_len(commit));
2068                         brelse(c_bh);
2069                         if (oldest_invalid_trans_id) {
2070                                 *oldest_invalid_trans_id =
2071                                     get_desc_trans_id(desc);
2072                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2073                                                "journal-1004: "
2074                                                "transaction_is_valid setting oldest invalid trans_id "
2075                                                "to %d",
2076                                                get_desc_trans_id(desc));
2077                         }
2078                         return -1;
2079                 }
2080                 brelse(c_bh);
2081                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2082                                "journal-1006: found valid "
2083                                "transaction start offset %llu, len %d id %d",
2084                                d_bh->b_blocknr -
2085                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2086                                get_desc_trans_len(desc),
2087                                get_desc_trans_id(desc));
2088                 return 1;
2089         } else {
2090                 return 0;
2091         }
2092 }
2093
2094 static void brelse_array(struct buffer_head **heads, int num)
2095 {
2096         int i;
2097         for (i = 0; i < num; i++) {
2098                 brelse(heads[i]);
2099         }
2100 }
2101
2102 /*
2103  * given the start, and values for the oldest acceptable transactions,
2104  * this either reads in a replays a transaction, or returns because the
2105  * transaction is invalid, or too old.
2106  * NOTE: only called during fs mount
2107  */
2108 static int journal_read_transaction(struct super_block *sb,
2109                                     unsigned long cur_dblock,
2110                                     unsigned long oldest_start,
2111                                     unsigned int oldest_trans_id,
2112                                     unsigned long newest_mount_id)
2113 {
2114         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2115         struct reiserfs_journal_desc *desc;
2116         struct reiserfs_journal_commit *commit;
2117         unsigned int trans_id = 0;
2118         struct buffer_head *c_bh;
2119         struct buffer_head *d_bh;
2120         struct buffer_head **log_blocks = NULL;
2121         struct buffer_head **real_blocks = NULL;
2122         unsigned int trans_offset;
2123         int i;
2124         int trans_half;
2125
2126         d_bh = journal_bread(sb, cur_dblock);
2127         if (!d_bh)
2128                 return 1;
2129         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2130         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2131         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2132                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2133                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2134                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2135         if (get_desc_trans_id(desc) < oldest_trans_id) {
2136                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2137                                "journal_read_trans skipping because %lu is too old",
2138                                cur_dblock -
2139                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2140                 brelse(d_bh);
2141                 return 1;
2142         }
2143         if (get_desc_mount_id(desc) != newest_mount_id) {
2144                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2145                                "journal_read_trans skipping because %d is != "
2146                                "newest_mount_id %lu", get_desc_mount_id(desc),
2147                                newest_mount_id);
2148                 brelse(d_bh);
2149                 return 1;
2150         }
2151         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2152                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2153                               SB_ONDISK_JOURNAL_SIZE(sb)));
2154         if (!c_bh) {
2155                 brelse(d_bh);
2156                 return 1;
2157         }
2158         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2159         if (journal_compare_desc_commit(sb, desc, commit)) {
2160                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2161                                "journal_read_transaction, "
2162                                "commit offset %llu had bad time %d or length %d",
2163                                c_bh->b_blocknr -
2164                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2165                                get_commit_trans_id(commit),
2166                                get_commit_trans_len(commit));
2167                 brelse(c_bh);
2168                 brelse(d_bh);
2169                 return 1;
2170         }
2171
2172         if (bdev_read_only(sb->s_bdev)) {
2173                 reiserfs_warning(sb, "clm-2076",
2174                                  "device is readonly, unable to replay log");
2175                 brelse(c_bh);
2176                 brelse(d_bh);
2177                 return -EROFS;
2178         }
2179
2180         trans_id = get_desc_trans_id(desc);
2181         /*
2182          * now we know we've got a good transaction, and it was
2183          * inside the valid time ranges
2184          */
2185         log_blocks = kmalloc_array(get_desc_trans_len(desc),
2186                                    sizeof(struct buffer_head *),
2187                                    GFP_NOFS);
2188         real_blocks = kmalloc_array(get_desc_trans_len(desc),
2189                                     sizeof(struct buffer_head *),
2190                                     GFP_NOFS);
2191         if (!log_blocks || !real_blocks) {
2192                 brelse(c_bh);
2193                 brelse(d_bh);
2194                 kfree(log_blocks);
2195                 kfree(real_blocks);
2196                 reiserfs_warning(sb, "journal-1169",
2197                                  "kmalloc failed, unable to mount FS");
2198                 return -1;
2199         }
2200         /* get all the buffer heads */
2201         trans_half = journal_trans_half(sb->s_blocksize);
2202         for (i = 0; i < get_desc_trans_len(desc); i++) {
2203                 log_blocks[i] =
2204                     journal_getblk(sb,
2205                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2206                                    (trans_offset + 1 +
2207                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2208                 if (i < trans_half) {
2209                         real_blocks[i] =
2210                             sb_getblk(sb,
2211                                       le32_to_cpu(desc->j_realblock[i]));
2212                 } else {
2213                         real_blocks[i] =
2214                             sb_getblk(sb,
2215                                       le32_to_cpu(commit->
2216                                                   j_realblock[i - trans_half]));
2217                 }
2218                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2219                         reiserfs_warning(sb, "journal-1207",
2220                                          "REPLAY FAILURE fsck required! "
2221                                          "Block to replay is outside of "
2222                                          "filesystem");
2223                         goto abort_replay;
2224                 }
2225                 /* make sure we don't try to replay onto log or reserved area */
2226                 if (is_block_in_log_or_reserved_area
2227                     (sb, real_blocks[i]->b_blocknr)) {
2228                         reiserfs_warning(sb, "journal-1204",
2229                                          "REPLAY FAILURE fsck required! "
2230                                          "Trying to replay onto a log block");
2231 abort_replay:
2232                         brelse_array(log_blocks, i);
2233                         brelse_array(real_blocks, i);
2234                         brelse(c_bh);
2235                         brelse(d_bh);
2236                         kfree(log_blocks);
2237                         kfree(real_blocks);
2238                         return -1;
2239                 }
2240         }
2241         /* read in the log blocks, memcpy to the corresponding real block */
2242         bh_read_batch(get_desc_trans_len(desc), log_blocks);
2243         for (i = 0; i < get_desc_trans_len(desc); i++) {
2244
2245                 wait_on_buffer(log_blocks[i]);
2246                 if (!buffer_uptodate(log_blocks[i])) {
2247                         reiserfs_warning(sb, "journal-1212",
2248                                          "REPLAY FAILURE fsck required! "
2249                                          "buffer write failed");
2250                         brelse_array(log_blocks + i,
2251                                      get_desc_trans_len(desc) - i);
2252                         brelse_array(real_blocks, get_desc_trans_len(desc));
2253                         brelse(c_bh);
2254                         brelse(d_bh);
2255                         kfree(log_blocks);
2256                         kfree(real_blocks);
2257                         return -1;
2258                 }
2259                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2260                        real_blocks[i]->b_size);
2261                 set_buffer_uptodate(real_blocks[i]);
2262                 brelse(log_blocks[i]);
2263         }
2264         /* flush out the real blocks */
2265         for (i = 0; i < get_desc_trans_len(desc); i++) {
2266                 set_buffer_dirty(real_blocks[i]);
2267                 write_dirty_buffer(real_blocks[i], 0);
2268         }
2269         for (i = 0; i < get_desc_trans_len(desc); i++) {
2270                 wait_on_buffer(real_blocks[i]);
2271                 if (!buffer_uptodate(real_blocks[i])) {
2272                         reiserfs_warning(sb, "journal-1226",
2273                                          "REPLAY FAILURE, fsck required! "
2274                                          "buffer write failed");
2275                         brelse_array(real_blocks + i,
2276                                      get_desc_trans_len(desc) - i);
2277                         brelse(c_bh);
2278                         brelse(d_bh);
2279                         kfree(log_blocks);
2280                         kfree(real_blocks);
2281                         return -1;
2282                 }
2283                 brelse(real_blocks[i]);
2284         }
2285         cur_dblock =
2286             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2287             ((trans_offset + get_desc_trans_len(desc) +
2288               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2289         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2290                        "journal-1095: setting journal " "start to offset %ld",
2291                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2292
2293         /*
2294          * init starting values for the first transaction, in case
2295          * this is the last transaction to be replayed.
2296          */
2297         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2298         journal->j_last_flush_trans_id = trans_id;
2299         journal->j_trans_id = trans_id + 1;
2300         /* check for trans_id overflow */
2301         if (journal->j_trans_id == 0)
2302                 journal->j_trans_id = 10;
2303         brelse(c_bh);
2304         brelse(d_bh);
2305         kfree(log_blocks);
2306         kfree(real_blocks);
2307         return 0;
2308 }
2309
2310 /*
2311  * This function reads blocks starting from block and to max_block of bufsize
2312  * size (but no more than BUFNR blocks at a time). This proved to improve
2313  * mounting speed on self-rebuilding raid5 arrays at least.
2314  * Right now it is only used from journal code. But later we might use it
2315  * from other places.
2316  * Note: Do not use journal_getblk/sb_getblk functions here!
2317  */
2318 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2319                                            b_blocknr_t block, int bufsize,
2320                                            b_blocknr_t max_block)
2321 {
2322         struct buffer_head *bhlist[BUFNR];
2323         unsigned int blocks = BUFNR;
2324         struct buffer_head *bh;
2325         int i, j;
2326
2327         bh = __getblk(dev, block, bufsize);
2328         if (!bh || buffer_uptodate(bh))
2329                 return (bh);
2330
2331         if (block + BUFNR > max_block) {
2332                 blocks = max_block - block;
2333         }
2334         bhlist[0] = bh;
2335         j = 1;
2336         for (i = 1; i < blocks; i++) {
2337                 bh = __getblk(dev, block + i, bufsize);
2338                 if (!bh)
2339                         break;
2340                 if (buffer_uptodate(bh)) {
2341                         brelse(bh);
2342                         break;
2343                 } else
2344                         bhlist[j++] = bh;
2345         }
2346         bh = bhlist[0];
2347         bh_read_nowait(bh, 0);
2348         bh_readahead_batch(j - 1, &bhlist[1], 0);
2349         for (i = 1; i < j; i++)
2350                 brelse(bhlist[i]);
2351         wait_on_buffer(bh);
2352         if (buffer_uptodate(bh))
2353                 return bh;
2354         brelse(bh);
2355         return NULL;
2356 }
2357
2358 /*
2359  * read and replay the log
2360  * on a clean unmount, the journal header's next unflushed pointer will be
2361  * to an invalid transaction.  This tests that before finding all the
2362  * transactions in the log, which makes normal mount times fast.
2363  *
2364  * After a crash, this starts with the next unflushed transaction, and
2365  * replays until it finds one too old, or invalid.
2366  *
2367  * On exit, it sets things up so the first transaction will work correctly.
2368  * NOTE: only called during fs mount
2369  */
2370 static int journal_read(struct super_block *sb)
2371 {
2372         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2373         struct reiserfs_journal_desc *desc;
2374         unsigned int oldest_trans_id = 0;
2375         unsigned int oldest_invalid_trans_id = 0;
2376         time64_t start;
2377         unsigned long oldest_start = 0;
2378         unsigned long cur_dblock = 0;
2379         unsigned long newest_mount_id = 9;
2380         struct buffer_head *d_bh;
2381         struct reiserfs_journal_header *jh;
2382         int valid_journal_header = 0;
2383         int replay_count = 0;
2384         int continue_replay = 1;
2385         int ret;
2386
2387         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2388         reiserfs_info(sb, "checking transaction log (%pg)\n",
2389                       file_bdev(journal->j_bdev_file));
2390         start = ktime_get_seconds();
2391
2392         /*
2393          * step 1, read in the journal header block.  Check the transaction
2394          * it says is the first unflushed, and if that transaction is not
2395          * valid, replay is done
2396          */
2397         journal->j_header_bh = journal_bread(sb,
2398                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2399                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2400         if (!journal->j_header_bh) {
2401                 return 1;
2402         }
2403         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2404         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2405             SB_ONDISK_JOURNAL_SIZE(sb)
2406             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2407                 oldest_start =
2408                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2409                     le32_to_cpu(jh->j_first_unflushed_offset);
2410                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2411                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2412                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2413                                "journal-1153: found in "
2414                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2415                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2416                                le32_to_cpu(jh->j_last_flush_trans_id));
2417                 valid_journal_header = 1;
2418
2419                 /*
2420                  * now, we try to read the first unflushed offset.  If it
2421                  * is not valid, there is nothing more we can do, and it
2422                  * makes no sense to read through the whole log.
2423                  */
2424                 d_bh =
2425                     journal_bread(sb,
2426                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2427                                   le32_to_cpu(jh->j_first_unflushed_offset));
2428                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2429                 if (!ret) {
2430                         continue_replay = 0;
2431                 }
2432                 brelse(d_bh);
2433                 goto start_log_replay;
2434         }
2435
2436         /*
2437          * ok, there are transactions that need to be replayed.  start
2438          * with the first log block, find all the valid transactions, and
2439          * pick out the oldest.
2440          */
2441         while (continue_replay
2442                && cur_dblock <
2443                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2444                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2445                 /*
2446                  * Note that it is required for blocksize of primary fs
2447                  * device and journal device to be the same
2448                  */
2449                 d_bh =
2450                     reiserfs_breada(file_bdev(journal->j_bdev_file), cur_dblock,
2451                                     sb->s_blocksize,
2452                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2453                                     SB_ONDISK_JOURNAL_SIZE(sb));
2454                 ret =
2455                     journal_transaction_is_valid(sb, d_bh,
2456                                                  &oldest_invalid_trans_id,
2457                                                  &newest_mount_id);
2458                 if (ret == 1) {
2459                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2460                         if (oldest_start == 0) {        /* init all oldest_ values */
2461                                 oldest_trans_id = get_desc_trans_id(desc);
2462                                 oldest_start = d_bh->b_blocknr;
2463                                 newest_mount_id = get_desc_mount_id(desc);
2464                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2465                                                "journal-1179: Setting "
2466                                                "oldest_start to offset %llu, trans_id %lu",
2467                                                oldest_start -
2468                                                SB_ONDISK_JOURNAL_1st_BLOCK
2469                                                (sb), oldest_trans_id);
2470                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2471                                 /* one we just read was older */
2472                                 oldest_trans_id = get_desc_trans_id(desc);
2473                                 oldest_start = d_bh->b_blocknr;
2474                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2475                                                "journal-1180: Resetting "
2476                                                "oldest_start to offset %lu, trans_id %lu",
2477                                                oldest_start -
2478                                                SB_ONDISK_JOURNAL_1st_BLOCK
2479                                                (sb), oldest_trans_id);
2480                         }
2481                         if (newest_mount_id < get_desc_mount_id(desc)) {
2482                                 newest_mount_id = get_desc_mount_id(desc);
2483                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2484                                                "journal-1299: Setting "
2485                                                "newest_mount_id to %d",
2486                                                get_desc_mount_id(desc));
2487                         }
2488                         cur_dblock += get_desc_trans_len(desc) + 2;
2489                 } else {
2490                         cur_dblock++;
2491                 }
2492                 brelse(d_bh);
2493         }
2494
2495 start_log_replay:
2496         cur_dblock = oldest_start;
2497         if (oldest_trans_id) {
2498                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2499                                "journal-1206: Starting replay "
2500                                "from offset %llu, trans_id %lu",
2501                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2502                                oldest_trans_id);
2503
2504         }
2505         replay_count = 0;
2506         while (continue_replay && oldest_trans_id > 0) {
2507                 ret =
2508                     journal_read_transaction(sb, cur_dblock, oldest_start,
2509                                              oldest_trans_id, newest_mount_id);
2510                 if (ret < 0) {
2511                         return ret;
2512                 } else if (ret != 0) {
2513                         break;
2514                 }
2515                 cur_dblock =
2516                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2517                 replay_count++;
2518                 if (cur_dblock == oldest_start)
2519                         break;
2520         }
2521
2522         if (oldest_trans_id == 0) {
2523                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2524                                "journal-1225: No valid " "transactions found");
2525         }
2526         /*
2527          * j_start does not get set correctly if we don't replay any
2528          * transactions.  if we had a valid journal_header, set j_start
2529          * to the first unflushed transaction value, copy the trans_id
2530          * from the header
2531          */
2532         if (valid_journal_header && replay_count == 0) {
2533                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2534                 journal->j_trans_id =
2535                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2536                 /* check for trans_id overflow */
2537                 if (journal->j_trans_id == 0)
2538                         journal->j_trans_id = 10;
2539                 journal->j_last_flush_trans_id =
2540                     le32_to_cpu(jh->j_last_flush_trans_id);
2541                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2542         } else {
2543                 journal->j_mount_id = newest_mount_id + 1;
2544         }
2545         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2546                        "newest_mount_id to %lu", journal->j_mount_id);
2547         journal->j_first_unflushed_offset = journal->j_start;
2548         if (replay_count > 0) {
2549                 reiserfs_info(sb,
2550                               "replayed %d transactions in %lu seconds\n",
2551                               replay_count, ktime_get_seconds() - start);
2552         }
2553         /* needed to satisfy the locking in _update_journal_header_block */
2554         reiserfs_write_lock(sb);
2555         if (!bdev_read_only(sb->s_bdev) &&
2556             _update_journal_header_block(sb, journal->j_start,
2557                                          journal->j_last_flush_trans_id)) {
2558                 reiserfs_write_unlock(sb);
2559                 /*
2560                  * replay failed, caller must call free_journal_ram and abort
2561                  * the mount
2562                  */
2563                 return -1;
2564         }
2565         reiserfs_write_unlock(sb);
2566         return 0;
2567 }
2568
2569 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2570 {
2571         struct reiserfs_journal_list *jl;
2572         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2573                      GFP_NOFS | __GFP_NOFAIL);
2574         INIT_LIST_HEAD(&jl->j_list);
2575         INIT_LIST_HEAD(&jl->j_working_list);
2576         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2577         INIT_LIST_HEAD(&jl->j_bh_list);
2578         mutex_init(&jl->j_commit_mutex);
2579         SB_JOURNAL(s)->j_num_lists++;
2580         get_journal_list(jl);
2581         return jl;
2582 }
2583
2584 static void journal_list_init(struct super_block *sb)
2585 {
2586         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2587 }
2588
2589 static void release_journal_dev(struct reiserfs_journal *journal)
2590 {
2591         if (journal->j_bdev_file) {
2592                 fput(journal->j_bdev_file);
2593                 journal->j_bdev_file = NULL;
2594         }
2595 }
2596
2597 static int journal_init_dev(struct super_block *super,
2598                             struct reiserfs_journal *journal,
2599                             const char *jdev_name)
2600 {
2601         blk_mode_t blkdev_mode = BLK_OPEN_READ;
2602         void *holder = journal;
2603         int result;
2604         dev_t jdev;
2605
2606         result = 0;
2607
2608         journal->j_bdev_file = NULL;
2609         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2610             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2611
2612         if (!bdev_read_only(super->s_bdev))
2613                 blkdev_mode |= BLK_OPEN_WRITE;
2614
2615         /* there is no "jdev" option and journal is on separate device */
2616         if ((!jdev_name || !jdev_name[0])) {
2617                 if (jdev == super->s_dev)
2618                         holder = NULL;
2619                 journal->j_bdev_file = bdev_file_open_by_dev(jdev, blkdev_mode,
2620                                                           holder, NULL);
2621                 if (IS_ERR(journal->j_bdev_file)) {
2622                         result = PTR_ERR(journal->j_bdev_file);
2623                         journal->j_bdev_file = NULL;
2624                         reiserfs_warning(super, "sh-458",
2625                                          "cannot init journal device unknown-block(%u,%u): %i",
2626                                          MAJOR(jdev), MINOR(jdev), result);
2627                         return result;
2628                 } else if (jdev != super->s_dev)
2629                         set_blocksize(file_bdev(journal->j_bdev_file),
2630                                       super->s_blocksize);
2631
2632                 return 0;
2633         }
2634
2635         journal->j_bdev_file = bdev_file_open_by_path(jdev_name, blkdev_mode,
2636                                                    holder, NULL);
2637         if (IS_ERR(journal->j_bdev_file)) {
2638                 result = PTR_ERR(journal->j_bdev_file);
2639                 journal->j_bdev_file = NULL;
2640                 reiserfs_warning(super, "sh-457",
2641                                  "journal_init_dev: Cannot open '%s': %i",
2642                                  jdev_name, result);
2643                 return result;
2644         }
2645
2646         set_blocksize(file_bdev(journal->j_bdev_file), super->s_blocksize);
2647         reiserfs_info(super,
2648                       "journal_init_dev: journal device: %pg\n",
2649                       file_bdev(journal->j_bdev_file));
2650         return 0;
2651 }
2652
2653 /*
2654  * When creating/tuning a file system user can assign some
2655  * journal params within boundaries which depend on the ratio
2656  * blocksize/standard_blocksize.
2657  *
2658  * For blocks >= standard_blocksize transaction size should
2659  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2660  * then JOURNAL_TRANS_MAX_DEFAULT.
2661  *
2662  * For blocks < standard_blocksize these boundaries should be
2663  * decreased proportionally.
2664  */
2665 #define REISERFS_STANDARD_BLKSIZE (4096)
2666
2667 static int check_advise_trans_params(struct super_block *sb,
2668                                      struct reiserfs_journal *journal)
2669 {
2670         if (journal->j_trans_max) {
2671                 /* Non-default journal params.  Do sanity check for them. */
2672                 int ratio = 1;
2673                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2674                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2675
2676                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2677                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2678                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2679                     JOURNAL_MIN_RATIO) {
2680                         reiserfs_warning(sb, "sh-462",
2681                                          "bad transaction max size (%u). "
2682                                          "FSCK?", journal->j_trans_max);
2683                         return 1;
2684                 }
2685                 if (journal->j_max_batch != (journal->j_trans_max) *
2686                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2687                         reiserfs_warning(sb, "sh-463",
2688                                          "bad transaction max batch (%u). "
2689                                          "FSCK?", journal->j_max_batch);
2690                         return 1;
2691                 }
2692         } else {
2693                 /*
2694                  * Default journal params.
2695                  * The file system was created by old version
2696                  * of mkreiserfs, so some fields contain zeros,
2697                  * and we need to advise proper values for them
2698                  */
2699                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2700                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2701                                          sb->s_blocksize);
2702                         return 1;
2703                 }
2704                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2705                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2706                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2707         }
2708         return 0;
2709 }
2710
2711 /* must be called once on fs mount.  calls journal_read for you */
2712 int journal_init(struct super_block *sb, const char *j_dev_name,
2713                  int old_format, unsigned int commit_max_age)
2714 {
2715         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2716         struct buffer_head *bhjh;
2717         struct reiserfs_super_block *rs;
2718         struct reiserfs_journal_header *jh;
2719         struct reiserfs_journal *journal;
2720         struct reiserfs_journal_list *jl;
2721         int ret;
2722
2723         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2724         if (!journal) {
2725                 reiserfs_warning(sb, "journal-1256",
2726                                  "unable to get memory for journal structure");
2727                 return 1;
2728         }
2729         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2730         INIT_LIST_HEAD(&journal->j_prealloc_list);
2731         INIT_LIST_HEAD(&journal->j_working_list);
2732         INIT_LIST_HEAD(&journal->j_journal_list);
2733         journal->j_persistent_trans = 0;
2734         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2735                                            reiserfs_bmap_count(sb)))
2736                 goto free_and_return;
2737
2738         allocate_bitmap_nodes(sb);
2739
2740         /* reserved for journal area support */
2741         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2742                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2743                                                  / sb->s_blocksize +
2744                                                  reiserfs_bmap_count(sb) +
2745                                                  1 :
2746                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2747                                                  sb->s_blocksize + 2);
2748
2749         /*
2750          * Sanity check to see is the standard journal fitting
2751          * within first bitmap (actual for small blocksizes)
2752          */
2753         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2754             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2755              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2756                 reiserfs_warning(sb, "journal-1393",
2757                                  "journal does not fit for area addressed "
2758                                  "by first of bitmap blocks. It starts at "
2759                                  "%u and its size is %u. Block size %ld",
2760                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2761                                  SB_ONDISK_JOURNAL_SIZE(sb),
2762                                  sb->s_blocksize);
2763                 goto free_and_return;
2764         }
2765
2766         /*
2767          * Sanity check to see if journal first block is correct.
2768          * If journal first block is invalid it can cause
2769          * zeroing important superblock members.
2770          */
2771         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2772             SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {
2773                 reiserfs_warning(sb, "journal-1393",
2774                                  "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",
2775                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2776                                  SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2777                 goto free_and_return;
2778         }
2779
2780         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2781                 reiserfs_warning(sb, "sh-462",
2782                                  "unable to initialize journal device");
2783                 goto free_and_return;
2784         }
2785
2786         rs = SB_DISK_SUPER_BLOCK(sb);
2787
2788         /* read journal header */
2789         bhjh = journal_bread(sb,
2790                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2791                              SB_ONDISK_JOURNAL_SIZE(sb));
2792         if (!bhjh) {
2793                 reiserfs_warning(sb, "sh-459",
2794                                  "unable to read journal header");
2795                 goto free_and_return;
2796         }
2797         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2798
2799         /* make sure that journal matches to the super block */
2800         if (is_reiserfs_jr(rs)
2801             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2802                 sb_jp_journal_magic(rs))) {
2803                 reiserfs_warning(sb, "sh-460",
2804                                  "journal header magic %x (device %pg) does "
2805                                  "not match to magic found in super block %x",
2806                                  jh->jh_journal.jp_journal_magic,
2807                                  file_bdev(journal->j_bdev_file),
2808                                  sb_jp_journal_magic(rs));
2809                 brelse(bhjh);
2810                 goto free_and_return;
2811         }
2812
2813         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2814         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2815         journal->j_max_commit_age =
2816             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2817         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2818
2819         if (check_advise_trans_params(sb, journal) != 0)
2820                 goto free_and_return;
2821         journal->j_default_max_commit_age = journal->j_max_commit_age;
2822
2823         if (commit_max_age != 0) {
2824                 journal->j_max_commit_age = commit_max_age;
2825                 journal->j_max_trans_age = commit_max_age;
2826         }
2827
2828         reiserfs_info(sb, "journal params: device %pg, size %u, "
2829                       "journal first block %u, max trans len %u, max batch %u, "
2830                       "max commit age %u, max trans age %u\n",
2831                       file_bdev(journal->j_bdev_file),
2832                       SB_ONDISK_JOURNAL_SIZE(sb),
2833                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2834                       journal->j_trans_max,
2835                       journal->j_max_batch,
2836                       journal->j_max_commit_age, journal->j_max_trans_age);
2837
2838         brelse(bhjh);
2839
2840         journal->j_list_bitmap_index = 0;
2841         journal_list_init(sb);
2842
2843         memset(journal->j_list_hash_table, 0,
2844                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2845
2846         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2847         spin_lock_init(&journal->j_dirty_buffers_lock);
2848
2849         journal->j_start = 0;
2850         journal->j_len = 0;
2851         journal->j_len_alloc = 0;
2852         atomic_set(&journal->j_wcount, 0);
2853         atomic_set(&journal->j_async_throttle, 0);
2854         journal->j_bcount = 0;
2855         journal->j_trans_start_time = 0;
2856         journal->j_last = NULL;
2857         journal->j_first = NULL;
2858         init_waitqueue_head(&journal->j_join_wait);
2859         mutex_init(&journal->j_mutex);
2860         mutex_init(&journal->j_flush_mutex);
2861
2862         journal->j_trans_id = 10;
2863         journal->j_mount_id = 10;
2864         journal->j_state = 0;
2865         atomic_set(&journal->j_jlock, 0);
2866         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2867         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2868         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2869         journal->j_cnode_used = 0;
2870         journal->j_must_wait = 0;
2871
2872         if (journal->j_cnode_free == 0) {
2873                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2874                                  "allocation failed (%ld bytes). Journal is "
2875                                  "too large for available memory. Usually "
2876                                  "this is due to a journal that is too large.",
2877                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2878                 goto free_and_return;
2879         }
2880
2881         init_journal_hash(sb);
2882         jl = journal->j_current_jl;
2883
2884         /*
2885          * get_list_bitmap() may call flush_commit_list() which
2886          * requires the lock. Calling flush_commit_list() shouldn't happen
2887          * this early but I like to be paranoid.
2888          */
2889         reiserfs_write_lock(sb);
2890         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2891         reiserfs_write_unlock(sb);
2892         if (!jl->j_list_bitmap) {
2893                 reiserfs_warning(sb, "journal-2005",
2894                                  "get_list_bitmap failed for journal list 0");
2895                 goto free_and_return;
2896         }
2897
2898         ret = journal_read(sb);
2899         if (ret < 0) {
2900                 reiserfs_warning(sb, "reiserfs-2006",
2901                                  "Replay Failure, unable to mount");
2902                 goto free_and_return;
2903         }
2904
2905         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2906         journal->j_work_sb = sb;
2907         return 0;
2908 free_and_return:
2909         free_journal_ram(sb);
2910         return 1;
2911 }
2912
2913 /*
2914  * test for a polite end of the current transaction.  Used by file_write,
2915  * and should be used by delete to make sure they don't write more than
2916  * can fit inside a single transaction
2917  */
2918 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2919                                    int new_alloc)
2920 {
2921         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2922         time64_t now = ktime_get_seconds();
2923         /* cannot restart while nested */
2924         BUG_ON(!th->t_trans_id);
2925         if (th->t_refcount > 1)
2926                 return 0;
2927         if (journal->j_must_wait > 0 ||
2928             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2929             atomic_read(&journal->j_jlock) ||
2930             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2931             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2932                 return 1;
2933         }
2934
2935         journal->j_len_alloc += new_alloc;
2936         th->t_blocks_allocated += new_alloc ;
2937         return 0;
2938 }
2939
2940 /* this must be called inside a transaction */
2941 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2942 {
2943         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2944         BUG_ON(!th->t_trans_id);
2945         journal->j_must_wait = 1;
2946         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2947         return;
2948 }
2949
2950 /* this must be called without a transaction started */
2951 void reiserfs_allow_writes(struct super_block *s)
2952 {
2953         struct reiserfs_journal *journal = SB_JOURNAL(s);
2954         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2955         wake_up(&journal->j_join_wait);
2956 }
2957
2958 /* this must be called without a transaction started */
2959 void reiserfs_wait_on_write_block(struct super_block *s)
2960 {
2961         struct reiserfs_journal *journal = SB_JOURNAL(s);
2962         wait_event(journal->j_join_wait,
2963                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2964 }
2965
2966 static void queue_log_writer(struct super_block *s)
2967 {
2968         wait_queue_entry_t wait;
2969         struct reiserfs_journal *journal = SB_JOURNAL(s);
2970         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2971
2972         /*
2973          * we don't want to use wait_event here because
2974          * we only want to wait once.
2975          */
2976         init_waitqueue_entry(&wait, current);
2977         add_wait_queue(&journal->j_join_wait, &wait);
2978         set_current_state(TASK_UNINTERRUPTIBLE);
2979         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2980                 int depth = reiserfs_write_unlock_nested(s);
2981                 schedule();
2982                 reiserfs_write_lock_nested(s, depth);
2983         }
2984         __set_current_state(TASK_RUNNING);
2985         remove_wait_queue(&journal->j_join_wait, &wait);
2986 }
2987
2988 static void wake_queued_writers(struct super_block *s)
2989 {
2990         struct reiserfs_journal *journal = SB_JOURNAL(s);
2991         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2992                 wake_up(&journal->j_join_wait);
2993 }
2994
2995 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2996 {
2997         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2998         unsigned long bcount = journal->j_bcount;
2999         while (1) {
3000                 int depth;
3001
3002                 depth = reiserfs_write_unlock_nested(sb);
3003                 schedule_timeout_uninterruptible(1);
3004                 reiserfs_write_lock_nested(sb, depth);
3005
3006                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
3007                 while ((atomic_read(&journal->j_wcount) > 0 ||
3008                         atomic_read(&journal->j_jlock)) &&
3009                        journal->j_trans_id == trans_id) {
3010                         queue_log_writer(sb);
3011                 }
3012                 if (journal->j_trans_id != trans_id)
3013                         break;
3014                 if (bcount == journal->j_bcount)
3015                         break;
3016                 bcount = journal->j_bcount;
3017         }
3018 }
3019
3020 /*
3021  * join == true if you must join an existing transaction.
3022  * join == false if you can deal with waiting for others to finish
3023  *
3024  * this will block until the transaction is joinable.  send the number of
3025  * blocks you expect to use in nblocks.
3026 */
3027 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3028                               struct super_block *sb, unsigned long nblocks,
3029                               int join)
3030 {
3031         time64_t now = ktime_get_seconds();
3032         unsigned int old_trans_id;
3033         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3034         struct reiserfs_transaction_handle myth;
3035         int retval;
3036         int depth;
3037
3038         reiserfs_check_lock_depth(sb, "journal_begin");
3039         BUG_ON(nblocks > journal->j_trans_max);
3040
3041         PROC_INFO_INC(sb, journal.journal_being);
3042         /* set here for journal_join */
3043         th->t_refcount = 1;
3044         th->t_super = sb;
3045
3046 relock:
3047         lock_journal(sb);
3048         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3049                 unlock_journal(sb);
3050                 retval = journal->j_errno;
3051                 goto out_fail;
3052         }
3053         journal->j_bcount++;
3054
3055         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3056                 unlock_journal(sb);
3057                 depth = reiserfs_write_unlock_nested(sb);
3058                 reiserfs_wait_on_write_block(sb);
3059                 reiserfs_write_lock_nested(sb, depth);
3060                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3061                 goto relock;
3062         }
3063         now = ktime_get_seconds();
3064
3065         /*
3066          * if there is no room in the journal OR
3067          * if this transaction is too old, and we weren't called joinable,
3068          * wait for it to finish before beginning we don't sleep if there
3069          * aren't other writers
3070          */
3071
3072         if ((!join && journal->j_must_wait > 0) ||
3073             (!join
3074              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3075             || (!join && atomic_read(&journal->j_wcount) > 0
3076                 && journal->j_trans_start_time > 0
3077                 && (now - journal->j_trans_start_time) >
3078                 journal->j_max_trans_age) || (!join
3079                                               && atomic_read(&journal->j_jlock))
3080             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3081
3082                 old_trans_id = journal->j_trans_id;
3083                 /* allow others to finish this transaction */
3084                 unlock_journal(sb);
3085
3086                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3087                     journal->j_max_batch &&
3088                     ((journal->j_len + nblocks + 2) * 100) <
3089                     (journal->j_len_alloc * 75)) {
3090                         if (atomic_read(&journal->j_wcount) > 10) {
3091                                 queue_log_writer(sb);
3092                                 goto relock;
3093                         }
3094                 }
3095                 /*
3096                  * don't mess with joining the transaction if all we
3097                  * have to do is wait for someone else to do a commit
3098                  */
3099                 if (atomic_read(&journal->j_jlock)) {
3100                         while (journal->j_trans_id == old_trans_id &&
3101                                atomic_read(&journal->j_jlock)) {
3102                                 queue_log_writer(sb);
3103                         }
3104                         goto relock;
3105                 }
3106                 retval = journal_join(&myth, sb);
3107                 if (retval)
3108                         goto out_fail;
3109
3110                 /* someone might have ended the transaction while we joined */
3111                 if (old_trans_id != journal->j_trans_id) {
3112                         retval = do_journal_end(&myth, 0);
3113                 } else {
3114                         retval = do_journal_end(&myth, COMMIT_NOW);
3115                 }
3116
3117                 if (retval)
3118                         goto out_fail;
3119
3120                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3121                 goto relock;
3122         }
3123         /* we are the first writer, set trans_id */
3124         if (journal->j_trans_start_time == 0) {
3125                 journal->j_trans_start_time = ktime_get_seconds();
3126         }
3127         atomic_inc(&journal->j_wcount);
3128         journal->j_len_alloc += nblocks;
3129         th->t_blocks_logged = 0;
3130         th->t_blocks_allocated = nblocks;
3131         th->t_trans_id = journal->j_trans_id;
3132         unlock_journal(sb);
3133         INIT_LIST_HEAD(&th->t_list);
3134         return 0;
3135
3136 out_fail:
3137         memset(th, 0, sizeof(*th));
3138         /*
3139          * Re-set th->t_super, so we can properly keep track of how many
3140          * persistent transactions there are. We need to do this so if this
3141          * call is part of a failed restart_transaction, we can free it later
3142          */
3143         th->t_super = sb;
3144         return retval;
3145 }
3146
3147 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3148                                                                     super_block
3149                                                                     *s,
3150                                                                     int nblocks)
3151 {
3152         int ret;
3153         struct reiserfs_transaction_handle *th;
3154
3155         /*
3156          * if we're nesting into an existing transaction.  It will be
3157          * persistent on its own
3158          */
3159         if (reiserfs_transaction_running(s)) {
3160                 th = current->journal_info;
3161                 th->t_refcount++;
3162                 BUG_ON(th->t_refcount < 2);
3163
3164                 return th;
3165         }
3166         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3167         if (!th)
3168                 return NULL;
3169         ret = journal_begin(th, s, nblocks);
3170         if (ret) {
3171                 kfree(th);
3172                 return NULL;
3173         }
3174
3175         SB_JOURNAL(s)->j_persistent_trans++;
3176         return th;
3177 }
3178
3179 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3180 {
3181         struct super_block *s = th->t_super;
3182         int ret = 0;
3183         if (th->t_trans_id)
3184                 ret = journal_end(th);
3185         else
3186                 ret = -EIO;
3187         if (th->t_refcount == 0) {
3188                 SB_JOURNAL(s)->j_persistent_trans--;
3189                 kfree(th);
3190         }
3191         return ret;
3192 }
3193
3194 static int journal_join(struct reiserfs_transaction_handle *th,
3195                         struct super_block *sb)
3196 {
3197         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3198
3199         /*
3200          * this keeps do_journal_end from NULLing out the
3201          * current->journal_info pointer
3202          */
3203         th->t_handle_save = cur_th;
3204         BUG_ON(cur_th && cur_th->t_refcount > 1);
3205         return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3206 }
3207
3208 int journal_join_abort(struct reiserfs_transaction_handle *th,
3209                        struct super_block *sb)
3210 {
3211         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3212
3213         /*
3214          * this keeps do_journal_end from NULLing out the
3215          * current->journal_info pointer
3216          */
3217         th->t_handle_save = cur_th;
3218         BUG_ON(cur_th && cur_th->t_refcount > 1);
3219         return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3220 }
3221
3222 int journal_begin(struct reiserfs_transaction_handle *th,
3223                   struct super_block *sb, unsigned long nblocks)
3224 {
3225         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3226         int ret;
3227
3228         th->t_handle_save = NULL;
3229         if (cur_th) {
3230                 /* we are nesting into the current transaction */
3231                 if (cur_th->t_super == sb) {
3232                         BUG_ON(!cur_th->t_refcount);
3233                         cur_th->t_refcount++;
3234                         memcpy(th, cur_th, sizeof(*th));
3235                         if (th->t_refcount <= 1)
3236                                 reiserfs_warning(sb, "reiserfs-2005",
3237                                                  "BAD: refcount <= 1, but "
3238                                                  "journal_info != 0");
3239                         return 0;
3240                 } else {
3241                         /*
3242                          * we've ended up with a handle from a different
3243                          * filesystem.  save it and restore on journal_end.
3244                          * This should never really happen...
3245                          */
3246                         reiserfs_warning(sb, "clm-2100",
3247                                          "nesting info a different FS");
3248                         th->t_handle_save = current->journal_info;
3249                         current->journal_info = th;
3250                 }
3251         } else {
3252                 current->journal_info = th;
3253         }
3254         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3255         BUG_ON(current->journal_info != th);
3256
3257         /*
3258          * I guess this boils down to being the reciprocal of clm-2100 above.
3259          * If do_journal_begin_r fails, we need to put it back, since
3260          * journal_end won't be called to do it. */
3261         if (ret)
3262                 current->journal_info = th->t_handle_save;
3263         else
3264                 BUG_ON(!th->t_refcount);
3265
3266         return ret;
3267 }
3268
3269 /*
3270  * puts bh into the current transaction.  If it was already there, reorders
3271  * removes the old pointers from the hash, and puts new ones in (to make
3272  * sure replay happen in the right order).
3273  *
3274  * if it was dirty, cleans and files onto the clean list.  I can't let it
3275  * be dirty again until the transaction is committed.
3276  *
3277  * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3278  */
3279 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3280                        struct buffer_head *bh)
3281 {
3282         struct super_block *sb = th->t_super;
3283         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3284         struct reiserfs_journal_cnode *cn = NULL;
3285         int count_already_incd = 0;
3286         int prepared = 0;
3287         BUG_ON(!th->t_trans_id);
3288
3289         PROC_INFO_INC(sb, journal.mark_dirty);
3290         if (th->t_trans_id != journal->j_trans_id) {
3291                 reiserfs_panic(th->t_super, "journal-1577",
3292                                "handle trans id %ld != current trans id %ld",
3293                                th->t_trans_id, journal->j_trans_id);
3294         }
3295
3296         prepared = test_clear_buffer_journal_prepared(bh);
3297         clear_buffer_journal_restore_dirty(bh);
3298         /* already in this transaction, we are done */
3299         if (buffer_journaled(bh)) {
3300                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3301                 return 0;
3302         }
3303
3304         /*
3305          * this must be turned into a panic instead of a warning.  We can't
3306          * allow a dirty or journal_dirty or locked buffer to be logged, as
3307          * some changes could get to disk too early.  NOT GOOD.
3308          */
3309         if (!prepared || buffer_dirty(bh)) {
3310                 reiserfs_warning(sb, "journal-1777",
3311                                  "buffer %llu bad state "
3312                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3313                                  (unsigned long long)bh->b_blocknr,
3314                                  prepared ? ' ' : '!',
3315                                  buffer_locked(bh) ? ' ' : '!',
3316                                  buffer_dirty(bh) ? ' ' : '!',
3317                                  buffer_journal_dirty(bh) ? ' ' : '!');
3318         }
3319
3320         if (atomic_read(&journal->j_wcount) <= 0) {
3321                 reiserfs_warning(sb, "journal-1409",
3322                                  "returning because j_wcount was %d",
3323                                  atomic_read(&journal->j_wcount));
3324                 return 1;
3325         }
3326         /*
3327          * this error means I've screwed up, and we've overflowed
3328          * the transaction.  Nothing can be done here, except make the
3329          * FS readonly or panic.
3330          */
3331         if (journal->j_len >= journal->j_trans_max) {
3332                 reiserfs_panic(th->t_super, "journal-1413",
3333                                "j_len (%lu) is too big",
3334                                journal->j_len);
3335         }
3336
3337         if (buffer_journal_dirty(bh)) {
3338                 count_already_incd = 1;
3339                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3340                 clear_buffer_journal_dirty(bh);
3341         }
3342
3343         if (journal->j_len > journal->j_len_alloc) {
3344                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3345         }
3346
3347         set_buffer_journaled(bh);
3348
3349         /* now put this guy on the end */
3350         if (!cn) {
3351                 cn = get_cnode(sb);
3352                 if (!cn) {
3353                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3354                 }
3355
3356                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3357                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3358                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3359                 }
3360                 th->t_blocks_logged++;
3361                 journal->j_len++;
3362
3363                 cn->bh = bh;
3364                 cn->blocknr = bh->b_blocknr;
3365                 cn->sb = sb;
3366                 cn->jlist = NULL;
3367                 insert_journal_hash(journal->j_hash_table, cn);
3368                 if (!count_already_incd) {
3369                         get_bh(bh);
3370                 }
3371         }
3372         cn->next = NULL;
3373         cn->prev = journal->j_last;
3374         cn->bh = bh;
3375         if (journal->j_last) {
3376                 journal->j_last->next = cn;
3377                 journal->j_last = cn;
3378         } else {
3379                 journal->j_first = cn;
3380                 journal->j_last = cn;
3381         }
3382         reiserfs_schedule_old_flush(sb);
3383         return 0;
3384 }
3385
3386 int journal_end(struct reiserfs_transaction_handle *th)
3387 {
3388         struct super_block *sb = th->t_super;
3389         if (!current->journal_info && th->t_refcount > 1)
3390                 reiserfs_warning(sb, "REISER-NESTING",
3391                                  "th NULL, refcount %d", th->t_refcount);
3392
3393         if (!th->t_trans_id) {
3394                 WARN_ON(1);
3395                 return -EIO;
3396         }
3397
3398         th->t_refcount--;
3399         if (th->t_refcount > 0) {
3400                 struct reiserfs_transaction_handle *cur_th =
3401                     current->journal_info;
3402
3403                 /*
3404                  * we aren't allowed to close a nested transaction on a
3405                  * different filesystem from the one in the task struct
3406                  */
3407                 BUG_ON(cur_th->t_super != th->t_super);
3408
3409                 if (th != cur_th) {
3410                         memcpy(current->journal_info, th, sizeof(*th));
3411                         th->t_trans_id = 0;
3412                 }
3413                 return 0;
3414         } else {
3415                 return do_journal_end(th, 0);
3416         }
3417 }
3418
3419 /*
3420  * removes from the current transaction, relsing and descrementing any counters.
3421  * also files the removed buffer directly onto the clean list
3422  *
3423  * called by journal_mark_freed when a block has been deleted
3424  *
3425  * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3426  */
3427 static int remove_from_transaction(struct super_block *sb,
3428                                    b_blocknr_t blocknr, int already_cleaned)
3429 {
3430         struct buffer_head *bh;
3431         struct reiserfs_journal_cnode *cn;
3432         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3433         int ret = 0;
3434
3435         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3436         if (!cn || !cn->bh) {
3437                 return ret;
3438         }
3439         bh = cn->bh;
3440         if (cn->prev) {
3441                 cn->prev->next = cn->next;
3442         }
3443         if (cn->next) {
3444                 cn->next->prev = cn->prev;
3445         }
3446         if (cn == journal->j_first) {
3447                 journal->j_first = cn->next;
3448         }
3449         if (cn == journal->j_last) {
3450                 journal->j_last = cn->prev;
3451         }
3452         remove_journal_hash(sb, journal->j_hash_table, NULL,
3453                             bh->b_blocknr, 0);
3454         clear_buffer_journaled(bh);     /* don't log this one */
3455
3456         if (!already_cleaned) {
3457                 clear_buffer_journal_dirty(bh);
3458                 clear_buffer_dirty(bh);
3459                 clear_buffer_journal_test(bh);
3460                 put_bh(bh);
3461                 if (atomic_read(&bh->b_count) < 0) {
3462                         reiserfs_warning(sb, "journal-1752",
3463                                          "b_count < 0");
3464                 }
3465                 ret = 1;
3466         }
3467         journal->j_len--;
3468         journal->j_len_alloc--;
3469         free_cnode(sb, cn);
3470         return ret;
3471 }
3472
3473 /*
3474  * for any cnode in a journal list, it can only be dirtied of all the
3475  * transactions that include it are committed to disk.
3476  * this checks through each transaction, and returns 1 if you are allowed
3477  * to dirty, and 0 if you aren't
3478  *
3479  * it is called by dirty_journal_list, which is called after
3480  * flush_commit_list has gotten all the log blocks for a given
3481  * transaction on disk
3482  *
3483  */
3484 static int can_dirty(struct reiserfs_journal_cnode *cn)
3485 {
3486         struct super_block *sb = cn->sb;
3487         b_blocknr_t blocknr = cn->blocknr;
3488         struct reiserfs_journal_cnode *cur = cn->hprev;
3489         int can_dirty = 1;
3490
3491         /*
3492          * first test hprev.  These are all newer than cn, so any node here
3493          * with the same block number and dev means this node can't be sent
3494          * to disk right now.
3495          */
3496         while (cur && can_dirty) {
3497                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3498                     cur->blocknr == blocknr) {
3499                         can_dirty = 0;
3500                 }
3501                 cur = cur->hprev;
3502         }
3503         /*
3504          * then test hnext.  These are all older than cn.  As long as they
3505          * are committed to the log, it is safe to write cn to disk
3506          */
3507         cur = cn->hnext;
3508         while (cur && can_dirty) {
3509                 if (cur->jlist && cur->jlist->j_len > 0 &&
3510                     atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3511                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3512                         can_dirty = 0;
3513                 }
3514                 cur = cur->hnext;
3515         }
3516         return can_dirty;
3517 }
3518
3519 /*
3520  * syncs the commit blocks, but does not force the real buffers to disk
3521  * will wait until the current transaction is done/committed before returning
3522  */
3523 int journal_end_sync(struct reiserfs_transaction_handle *th)
3524 {
3525         struct super_block *sb = th->t_super;
3526         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3527
3528         BUG_ON(!th->t_trans_id);
3529         /* you can sync while nested, very, very bad */
3530         BUG_ON(th->t_refcount > 1);
3531         if (journal->j_len == 0) {
3532                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3533                                              1);
3534                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3535         }
3536         return do_journal_end(th, COMMIT_NOW | WAIT);
3537 }
3538
3539 /* writeback the pending async commits to disk */
3540 static void flush_async_commits(struct work_struct *work)
3541 {
3542         struct reiserfs_journal *journal =
3543                 container_of(work, struct reiserfs_journal, j_work.work);
3544         struct super_block *sb = journal->j_work_sb;
3545         struct reiserfs_journal_list *jl;
3546         struct list_head *entry;
3547
3548         reiserfs_write_lock(sb);
3549         if (!list_empty(&journal->j_journal_list)) {
3550                 /* last entry is the youngest, commit it and you get everything */
3551                 entry = journal->j_journal_list.prev;
3552                 jl = JOURNAL_LIST_ENTRY(entry);
3553                 flush_commit_list(sb, jl, 1);
3554         }
3555         reiserfs_write_unlock(sb);
3556 }
3557
3558 /*
3559  * flushes any old transactions to disk
3560  * ends the current transaction if it is too old
3561  */
3562 void reiserfs_flush_old_commits(struct super_block *sb)
3563 {
3564         time64_t now;
3565         struct reiserfs_transaction_handle th;
3566         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3567
3568         now = ktime_get_seconds();
3569         /*
3570          * safety check so we don't flush while we are replaying the log during
3571          * mount
3572          */
3573         if (list_empty(&journal->j_journal_list))
3574                 return;
3575
3576         /*
3577          * check the current transaction.  If there are no writers, and it is
3578          * too old, finish it, and force the commit blocks to disk
3579          */
3580         if (atomic_read(&journal->j_wcount) <= 0 &&
3581             journal->j_trans_start_time > 0 &&
3582             journal->j_len > 0 &&
3583             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3584                 if (!journal_join(&th, sb)) {
3585                         reiserfs_prepare_for_journal(sb,
3586                                                      SB_BUFFER_WITH_SB(sb),
3587                                                      1);
3588                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3589
3590                         /*
3591                          * we're only being called from kreiserfsd, it makes
3592                          * no sense to do an async commit so that kreiserfsd
3593                          * can do it later
3594                          */
3595                         do_journal_end(&th, COMMIT_NOW | WAIT);
3596                 }
3597         }
3598 }
3599
3600 /*
3601  * returns 0 if do_journal_end should return right away, returns 1 if
3602  * do_journal_end should finish the commit
3603  *
3604  * if the current transaction is too old, but still has writers, this will
3605  * wait on j_join_wait until all the writers are done.  By the time it
3606  * wakes up, the transaction it was called has already ended, so it just
3607  * flushes the commit list and returns 0.
3608  *
3609  * Won't batch when flush or commit_now is set.  Also won't batch when
3610  * others are waiting on j_join_wait.
3611  *
3612  * Note, we can't allow the journal_end to proceed while there are still
3613  * writers in the log.
3614  */
3615 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3616 {
3617
3618         time64_t now;
3619         int flush = flags & FLUSH_ALL;
3620         int commit_now = flags & COMMIT_NOW;
3621         int wait_on_commit = flags & WAIT;
3622         struct reiserfs_journal_list *jl;
3623         struct super_block *sb = th->t_super;
3624         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3625
3626         BUG_ON(!th->t_trans_id);
3627
3628         if (th->t_trans_id != journal->j_trans_id) {
3629                 reiserfs_panic(th->t_super, "journal-1577",
3630                                "handle trans id %ld != current trans id %ld",
3631                                th->t_trans_id, journal->j_trans_id);
3632         }
3633
3634         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3635         /* <= 0 is allowed.  unmounting might not call begin */
3636         if (atomic_read(&journal->j_wcount) > 0)
3637                 atomic_dec(&journal->j_wcount);
3638
3639         /*
3640          * BUG, deal with case where j_len is 0, but people previously
3641          * freed blocks need to be released will be dealt with by next
3642          * transaction that actually writes something, but should be taken
3643          * care of in this trans
3644          */
3645         BUG_ON(journal->j_len == 0);
3646
3647         /*
3648          * if wcount > 0, and we are called to with flush or commit_now,
3649          * we wait on j_join_wait.  We will wake up when the last writer has
3650          * finished the transaction, and started it on its way to the disk.
3651          * Then, we flush the commit or journal list, and just return 0
3652          * because the rest of journal end was already done for this
3653          * transaction.
3654          */
3655         if (atomic_read(&journal->j_wcount) > 0) {
3656                 if (flush || commit_now) {
3657                         unsigned trans_id;
3658
3659                         jl = journal->j_current_jl;
3660                         trans_id = jl->j_trans_id;
3661                         if (wait_on_commit)
3662                                 jl->j_state |= LIST_COMMIT_PENDING;
3663                         atomic_set(&journal->j_jlock, 1);
3664                         if (flush) {
3665                                 journal->j_next_full_flush = 1;
3666                         }
3667                         unlock_journal(sb);
3668
3669                         /*
3670                          * sleep while the current transaction is
3671                          * still j_jlocked
3672                          */
3673                         while (journal->j_trans_id == trans_id) {
3674                                 if (atomic_read(&journal->j_jlock)) {
3675                                         queue_log_writer(sb);
3676                                 } else {
3677                                         lock_journal(sb);
3678                                         if (journal->j_trans_id == trans_id) {
3679                                                 atomic_set(&journal->j_jlock,
3680                                                            1);
3681                                         }
3682                                         unlock_journal(sb);
3683                                 }
3684                         }
3685                         BUG_ON(journal->j_trans_id == trans_id);
3686
3687                         if (commit_now
3688                             && journal_list_still_alive(sb, trans_id)
3689                             && wait_on_commit) {
3690                                 flush_commit_list(sb, jl, 1);
3691                         }
3692                         return 0;
3693                 }
3694                 unlock_journal(sb);
3695                 return 0;
3696         }
3697
3698         /* deal with old transactions where we are the last writers */
3699         now = ktime_get_seconds();
3700         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3701                 commit_now = 1;
3702                 journal->j_next_async_flush = 1;
3703         }
3704         /* don't batch when someone is waiting on j_join_wait */
3705         /* don't batch when syncing the commit or flushing the whole trans */
3706         if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3707             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3708             && journal->j_len_alloc < journal->j_max_batch
3709             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3710                 journal->j_bcount++;
3711                 unlock_journal(sb);
3712                 return 0;
3713         }
3714
3715         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3716                 reiserfs_panic(sb, "journal-003",
3717                                "j_start (%ld) is too high",
3718                                journal->j_start);
3719         }
3720         return 1;
3721 }
3722
3723 /*
3724  * Does all the work that makes deleting blocks safe.
3725  * when deleting a block mark BH_JNew, just remove it from the current
3726  * transaction, clean it's buffer_head and move on.
3727  *
3728  * otherwise:
3729  * set a bit for the block in the journal bitmap.  That will prevent it from
3730  * being allocated for unformatted nodes before this transaction has finished.
3731  *
3732  * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3733  * That will prevent any old transactions with this block from trying to flush
3734  * to the real location.  Since we aren't removing the cnode from the
3735  * journal_list_hash, *the block can't be reallocated yet.
3736  *
3737  * Then remove it from the current transaction, decrementing any counters and
3738  * filing it on the clean list.
3739  */
3740 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3741                        struct super_block *sb, b_blocknr_t blocknr)
3742 {
3743         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3744         struct reiserfs_journal_cnode *cn = NULL;
3745         struct buffer_head *bh = NULL;
3746         struct reiserfs_list_bitmap *jb = NULL;
3747         int cleaned = 0;
3748         BUG_ON(!th->t_trans_id);
3749
3750         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3751         if (cn && cn->bh) {
3752                 bh = cn->bh;
3753                 get_bh(bh);
3754         }
3755         /* if it is journal new, we just remove it from this transaction */
3756         if (bh && buffer_journal_new(bh)) {
3757                 clear_buffer_journal_new(bh);
3758                 clear_prepared_bits(bh);
3759                 reiserfs_clean_and_file_buffer(bh);
3760                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3761         } else {
3762                 /*
3763                  * set the bit for this block in the journal bitmap
3764                  * for this transaction
3765                  */
3766                 jb = journal->j_current_jl->j_list_bitmap;
3767                 if (!jb) {
3768                         reiserfs_panic(sb, "journal-1702",
3769                                        "journal_list_bitmap is NULL");
3770                 }
3771                 set_bit_in_list_bitmap(sb, blocknr, jb);
3772
3773                 /* Note, the entire while loop is not allowed to schedule.  */
3774
3775                 if (bh) {
3776                         clear_prepared_bits(bh);
3777                         reiserfs_clean_and_file_buffer(bh);
3778                 }
3779                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3780
3781                 /*
3782                  * find all older transactions with this block,
3783                  * make sure they don't try to write it out
3784                  */
3785                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3786                                           blocknr);
3787                 while (cn) {
3788                         if (sb == cn->sb && blocknr == cn->blocknr) {
3789                                 set_bit(BLOCK_FREED, &cn->state);
3790                                 if (cn->bh) {
3791                                         /*
3792                                          * remove_from_transaction will brelse
3793                                          * the buffer if it was in the current
3794                                          * trans
3795                                          */
3796                                         if (!cleaned) {
3797                                                 clear_buffer_journal_dirty(cn->
3798                                                                            bh);
3799                                                 clear_buffer_dirty(cn->bh);
3800                                                 clear_buffer_journal_test(cn->
3801                                                                           bh);
3802                                                 cleaned = 1;
3803                                                 put_bh(cn->bh);
3804                                                 if (atomic_read
3805                                                     (&cn->bh->b_count) < 0) {
3806                                                         reiserfs_warning(sb,
3807                                                                  "journal-2138",
3808                                                                  "cn->bh->b_count < 0");
3809                                                 }
3810                                         }
3811                                         /*
3812                                          * since we are clearing the bh,
3813                                          * we MUST dec nonzerolen
3814                                          */
3815                                         if (cn->jlist) {
3816                                                 atomic_dec(&cn->jlist->
3817                                                            j_nonzerolen);
3818                                         }
3819                                         cn->bh = NULL;
3820                                 }
3821                         }
3822                         cn = cn->hnext;
3823                 }
3824         }
3825
3826         if (bh)
3827                 release_buffer_page(bh); /* get_hash grabs the buffer */
3828         return 0;
3829 }
3830
3831 void reiserfs_update_inode_transaction(struct inode *inode)
3832 {
3833         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3834         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3835         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3836 }
3837
3838 /*
3839  * returns -1 on error, 0 if no commits/barriers were done and 1
3840  * if a transaction was actually committed and the barrier was done
3841  */
3842 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3843                              struct reiserfs_journal_list *jl)
3844 {
3845         struct reiserfs_transaction_handle th;
3846         struct super_block *sb = inode->i_sb;
3847         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3848         int ret = 0;
3849
3850         /*
3851          * is it from the current transaction,
3852          * or from an unknown transaction?
3853          */
3854         if (id == journal->j_trans_id) {
3855                 jl = journal->j_current_jl;
3856                 /*
3857                  * try to let other writers come in and
3858                  * grow this transaction
3859                  */
3860                 let_transaction_grow(sb, id);
3861                 if (journal->j_trans_id != id) {
3862                         goto flush_commit_only;
3863                 }
3864
3865                 ret = journal_begin(&th, sb, 1);
3866                 if (ret)
3867                         return ret;
3868
3869                 /* someone might have ended this transaction while we joined */
3870                 if (journal->j_trans_id != id) {
3871                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3872                                                      1);
3873                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3874                         ret = journal_end(&th);
3875                         goto flush_commit_only;
3876                 }
3877
3878                 ret = journal_end_sync(&th);
3879                 if (!ret)
3880                         ret = 1;
3881
3882         } else {
3883                 /*
3884                  * this gets tricky, we have to make sure the journal list in
3885                  * the inode still exists.  We know the list is still around
3886                  * if we've got a larger transaction id than the oldest list
3887                  */
3888 flush_commit_only:
3889                 if (journal_list_still_alive(inode->i_sb, id)) {
3890                         /*
3891                          * we only set ret to 1 when we know for sure
3892                          * the barrier hasn't been started yet on the commit
3893                          * block.
3894                          */
3895                         if (atomic_read(&jl->j_commit_left) > 1)
3896                                 ret = 1;
3897                         flush_commit_list(sb, jl, 1);
3898                         if (journal->j_errno)
3899                                 ret = journal->j_errno;
3900                 }
3901         }
3902         /* otherwise the list is gone, and long since committed */
3903         return ret;
3904 }
3905
3906 int reiserfs_commit_for_inode(struct inode *inode)
3907 {
3908         unsigned int id = REISERFS_I(inode)->i_trans_id;
3909         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3910
3911         /*
3912          * for the whole inode, assume unset id means it was
3913          * changed in the current transaction.  More conservative
3914          */
3915         if (!id || !jl) {
3916                 reiserfs_update_inode_transaction(inode);
3917                 id = REISERFS_I(inode)->i_trans_id;
3918                 /* jl will be updated in __commit_trans_jl */
3919         }
3920
3921         return __commit_trans_jl(inode, id, jl);
3922 }
3923
3924 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3925                                       struct buffer_head *bh)
3926 {
3927         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3928         PROC_INFO_INC(sb, journal.restore_prepared);
3929         if (!bh) {
3930                 return;
3931         }
3932         if (test_clear_buffer_journal_restore_dirty(bh) &&
3933             buffer_journal_dirty(bh)) {
3934                 struct reiserfs_journal_cnode *cn;
3935                 reiserfs_write_lock(sb);
3936                 cn = get_journal_hash_dev(sb,
3937                                           journal->j_list_hash_table,
3938                                           bh->b_blocknr);
3939                 if (cn && can_dirty(cn)) {
3940                         set_buffer_journal_test(bh);
3941                         mark_buffer_dirty(bh);
3942                 }
3943                 reiserfs_write_unlock(sb);
3944         }
3945         clear_buffer_journal_prepared(bh);
3946 }
3947
3948 extern struct tree_balance *cur_tb;
3949 /*
3950  * before we can change a metadata block, we have to make sure it won't
3951  * be written to disk while we are altering it.  So, we must:
3952  * clean it
3953  * wait on it.
3954  */
3955 int reiserfs_prepare_for_journal(struct super_block *sb,
3956                                  struct buffer_head *bh, int wait)
3957 {
3958         PROC_INFO_INC(sb, journal.prepare);
3959
3960         if (!trylock_buffer(bh)) {
3961                 if (!wait)
3962                         return 0;
3963                 lock_buffer(bh);
3964         }
3965         set_buffer_journal_prepared(bh);
3966         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3967                 clear_buffer_journal_test(bh);
3968                 set_buffer_journal_restore_dirty(bh);
3969         }
3970         unlock_buffer(bh);
3971         return 1;
3972 }
3973
3974 /*
3975  * long and ugly.  If flush, will not return until all commit
3976  * blocks and all real buffers in the trans are on disk.
3977  * If no_async, won't return until all commit blocks are on disk.
3978  *
3979  * keep reading, there are comments as you go along
3980  *
3981  * If the journal is aborted, we just clean up. Things like flushing
3982  * journal lists, etc just won't happen.
3983  */
3984 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3985 {
3986         struct super_block *sb = th->t_super;
3987         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3988         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3989         struct reiserfs_journal_cnode *last_cn = NULL;
3990         struct reiserfs_journal_desc *desc;
3991         struct reiserfs_journal_commit *commit;
3992         struct buffer_head *c_bh;       /* commit bh */
3993         struct buffer_head *d_bh;       /* desc bh */
3994         int cur_write_start = 0;        /* start index of current log write */
3995         int i;
3996         int flush;
3997         int wait_on_commit;
3998         struct reiserfs_journal_list *jl, *temp_jl;
3999         struct list_head *entry, *safe;
4000         unsigned long jindex;
4001         unsigned int commit_trans_id;
4002         int trans_half;
4003         int depth;
4004
4005         BUG_ON(th->t_refcount > 1);
4006         BUG_ON(!th->t_trans_id);
4007         BUG_ON(!th->t_super);
4008
4009         /*
4010          * protect flush_older_commits from doing mistakes if the
4011          * transaction ID counter gets overflowed.
4012          */
4013         if (th->t_trans_id == ~0U)
4014                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4015         flush = flags & FLUSH_ALL;
4016         wait_on_commit = flags & WAIT;
4017
4018         current->journal_info = th->t_handle_save;
4019         reiserfs_check_lock_depth(sb, "journal end");
4020         if (journal->j_len == 0) {
4021                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4022                                              1);
4023                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4024         }
4025
4026         lock_journal(sb);
4027         if (journal->j_next_full_flush) {
4028                 flags |= FLUSH_ALL;
4029                 flush = 1;
4030         }
4031         if (journal->j_next_async_flush) {
4032                 flags |= COMMIT_NOW | WAIT;
4033                 wait_on_commit = 1;
4034         }
4035
4036         /*
4037          * check_journal_end locks the journal, and unlocks if it does
4038          * not return 1 it tells us if we should continue with the
4039          * journal_end, or just return
4040          */
4041         if (!check_journal_end(th, flags)) {
4042                 reiserfs_schedule_old_flush(sb);
4043                 wake_queued_writers(sb);
4044                 reiserfs_async_progress_wait(sb);
4045                 goto out;
4046         }
4047
4048         /* check_journal_end might set these, check again */
4049         if (journal->j_next_full_flush) {
4050                 flush = 1;
4051         }
4052
4053         /*
4054          * j must wait means we have to flush the log blocks, and the
4055          * real blocks for this transaction
4056          */
4057         if (journal->j_must_wait > 0) {
4058                 flush = 1;
4059         }
4060 #ifdef REISERFS_PREALLOCATE
4061         /*
4062          * quota ops might need to nest, setup the journal_info pointer
4063          * for them and raise the refcount so that it is > 0.
4064          */
4065         current->journal_info = th;
4066         th->t_refcount++;
4067
4068         /* it should not involve new blocks into the transaction */
4069         reiserfs_discard_all_prealloc(th);
4070
4071         th->t_refcount--;
4072         current->journal_info = th->t_handle_save;
4073 #endif
4074
4075         /* setup description block */
4076         d_bh =
4077             journal_getblk(sb,
4078                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4079                            journal->j_start);
4080         set_buffer_uptodate(d_bh);
4081         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4082         memset(d_bh->b_data, 0, d_bh->b_size);
4083         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4084         set_desc_trans_id(desc, journal->j_trans_id);
4085
4086         /*
4087          * setup commit block.  Don't write (keep it clean too) this one
4088          * until after everyone else is written
4089          */
4090         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4091                               ((journal->j_start + journal->j_len +
4092                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4093         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4094         memset(c_bh->b_data, 0, c_bh->b_size);
4095         set_commit_trans_id(commit, journal->j_trans_id);
4096         set_buffer_uptodate(c_bh);
4097
4098         /* init this journal list */
4099         jl = journal->j_current_jl;
4100
4101         /*
4102          * we lock the commit before doing anything because
4103          * we want to make sure nobody tries to run flush_commit_list until
4104          * the new transaction is fully setup, and we've already flushed the
4105          * ordered bh list
4106          */
4107         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4108
4109         /* save the transaction id in case we need to commit it later */
4110         commit_trans_id = jl->j_trans_id;
4111
4112         atomic_set(&jl->j_older_commits_done, 0);
4113         jl->j_trans_id = journal->j_trans_id;
4114         jl->j_timestamp = journal->j_trans_start_time;
4115         jl->j_commit_bh = c_bh;
4116         jl->j_start = journal->j_start;
4117         jl->j_len = journal->j_len;
4118         atomic_set(&jl->j_nonzerolen, journal->j_len);
4119         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4120         jl->j_realblock = NULL;
4121
4122         /*
4123          * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4124          * for each real block, add it to the journal list hash,
4125          * copy into real block index array in the commit or desc block
4126          */
4127         trans_half = journal_trans_half(sb->s_blocksize);
4128         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4129                 if (buffer_journaled(cn->bh)) {
4130                         jl_cn = get_cnode(sb);
4131                         if (!jl_cn) {
4132                                 reiserfs_panic(sb, "journal-1676",
4133                                                "get_cnode returned NULL");
4134                         }
4135                         if (i == 0) {
4136                                 jl->j_realblock = jl_cn;
4137                         }
4138                         jl_cn->prev = last_cn;
4139                         jl_cn->next = NULL;
4140                         if (last_cn) {
4141                                 last_cn->next = jl_cn;
4142                         }
4143                         last_cn = jl_cn;
4144                         /*
4145                          * make sure the block we are trying to log
4146                          * is not a block of journal or reserved area
4147                          */
4148                         if (is_block_in_log_or_reserved_area
4149                             (sb, cn->bh->b_blocknr)) {
4150                                 reiserfs_panic(sb, "journal-2332",
4151                                                "Trying to log block %lu, "
4152                                                "which is a log block",
4153                                                cn->bh->b_blocknr);
4154                         }
4155                         jl_cn->blocknr = cn->bh->b_blocknr;
4156                         jl_cn->state = 0;
4157                         jl_cn->sb = sb;
4158                         jl_cn->bh = cn->bh;
4159                         jl_cn->jlist = jl;
4160                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4161                         if (i < trans_half) {
4162                                 desc->j_realblock[i] =
4163                                     cpu_to_le32(cn->bh->b_blocknr);
4164                         } else {
4165                                 commit->j_realblock[i - trans_half] =
4166                                     cpu_to_le32(cn->bh->b_blocknr);
4167                         }
4168                 } else {
4169                         i--;
4170                 }
4171         }
4172         set_desc_trans_len(desc, journal->j_len);
4173         set_desc_mount_id(desc, journal->j_mount_id);
4174         set_desc_trans_id(desc, journal->j_trans_id);
4175         set_commit_trans_len(commit, journal->j_len);
4176
4177         /*
4178          * special check in case all buffers in the journal
4179          * were marked for not logging
4180          */
4181         BUG_ON(journal->j_len == 0);
4182
4183         /*
4184          * we're about to dirty all the log blocks, mark the description block
4185          * dirty now too.  Don't mark the commit block dirty until all the
4186          * others are on disk
4187          */
4188         mark_buffer_dirty(d_bh);
4189
4190         /*
4191          * first data block is j_start + 1, so add one to
4192          * cur_write_start wherever you use it
4193          */
4194         cur_write_start = journal->j_start;
4195         cn = journal->j_first;
4196         jindex = 1;     /* start at one so we don't get the desc again */
4197         while (cn) {
4198                 clear_buffer_journal_new(cn->bh);
4199                 /* copy all the real blocks into log area.  dirty log blocks */
4200                 if (buffer_journaled(cn->bh)) {
4201                         struct buffer_head *tmp_bh;
4202                         char *addr;
4203                         struct page *page;
4204                         tmp_bh =
4205                             journal_getblk(sb,
4206                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4207                                            ((cur_write_start +
4208                                              jindex) %
4209                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4210                         set_buffer_uptodate(tmp_bh);
4211                         page = cn->bh->b_page;
4212                         addr = kmap(page);
4213                         memcpy(tmp_bh->b_data,
4214                                addr + offset_in_page(cn->bh->b_data),
4215                                cn->bh->b_size);
4216                         kunmap(page);
4217                         mark_buffer_dirty(tmp_bh);
4218                         jindex++;
4219                         set_buffer_journal_dirty(cn->bh);
4220                         clear_buffer_journaled(cn->bh);
4221                 } else {
4222                         /*
4223                          * JDirty cleared sometime during transaction.
4224                          * don't log this one
4225                          */
4226                         reiserfs_warning(sb, "journal-2048",
4227                                          "BAD, buffer in journal hash, "
4228                                          "but not JDirty!");
4229                         brelse(cn->bh);
4230                 }
4231                 next = cn->next;
4232                 free_cnode(sb, cn);
4233                 cn = next;
4234                 reiserfs_cond_resched(sb);
4235         }
4236
4237         /*
4238          * we are done with both the c_bh and d_bh, but
4239          * c_bh must be written after all other commit blocks,
4240          * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4241          */
4242
4243         journal->j_current_jl = alloc_journal_list(sb);
4244
4245         /* now it is safe to insert this transaction on the main list */
4246         list_add_tail(&jl->j_list, &journal->j_journal_list);
4247         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4248         journal->j_num_work_lists++;
4249
4250         /* reset journal values for the next transaction */
4251         journal->j_start =
4252             (journal->j_start + journal->j_len +
4253              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4254         atomic_set(&journal->j_wcount, 0);
4255         journal->j_bcount = 0;
4256         journal->j_last = NULL;
4257         journal->j_first = NULL;
4258         journal->j_len = 0;
4259         journal->j_trans_start_time = 0;
4260         /* check for trans_id overflow */
4261         if (++journal->j_trans_id == 0)
4262                 journal->j_trans_id = 10;
4263         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4264         journal->j_must_wait = 0;
4265         journal->j_len_alloc = 0;
4266         journal->j_next_full_flush = 0;
4267         journal->j_next_async_flush = 0;
4268         init_journal_hash(sb);
4269
4270         /*
4271          * make sure reiserfs_add_jh sees the new current_jl before we
4272          * write out the tails
4273          */
4274         smp_mb();
4275
4276         /*
4277          * tail conversion targets have to hit the disk before we end the
4278          * transaction.  Otherwise a later transaction might repack the tail
4279          * before this transaction commits, leaving the data block unflushed
4280          * and clean, if we crash before the later transaction commits, the
4281          * data block is lost.
4282          */
4283         if (!list_empty(&jl->j_tail_bh_list)) {
4284                 depth = reiserfs_write_unlock_nested(sb);
4285                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4286                                       journal, jl, &jl->j_tail_bh_list);
4287                 reiserfs_write_lock_nested(sb, depth);
4288         }
4289         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4290         mutex_unlock(&jl->j_commit_mutex);
4291
4292         /*
4293          * honor the flush wishes from the caller, simple commits can
4294          * be done outside the journal lock, they are done below
4295          *
4296          * if we don't flush the commit list right now, we put it into
4297          * the work queue so the people waiting on the async progress work
4298          * queue don't wait for this proc to flush journal lists and such.
4299          */
4300         if (flush) {
4301                 flush_commit_list(sb, jl, 1);
4302                 flush_journal_list(sb, jl, 1);
4303         } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4304                 /*
4305                  * Avoid queueing work when sb is being shut down. Transaction
4306                  * will be flushed on journal shutdown.
4307                  */
4308                 if (sb->s_flags & SB_ACTIVE)
4309                         queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4310                                            &journal->j_work, HZ / 10);
4311         }
4312
4313         /*
4314          * if the next transaction has any chance of wrapping, flush
4315          * transactions that might get overwritten.  If any journal lists
4316          * are very old flush them as well.
4317          */
4318 first_jl:
4319         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4320                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4321                 if (journal->j_start <= temp_jl->j_start) {
4322                         if ((journal->j_start + journal->j_trans_max + 1) >=
4323                             temp_jl->j_start) {
4324                                 flush_used_journal_lists(sb, temp_jl);
4325                                 goto first_jl;
4326                         } else if ((journal->j_start +
4327                                     journal->j_trans_max + 1) <
4328                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4329                                 /*
4330                                  * if we don't cross into the next
4331                                  * transaction and we don't wrap, there is
4332                                  * no way we can overlap any later transactions
4333                                  * break now
4334                                  */
4335                                 break;
4336                         }
4337                 } else if ((journal->j_start +
4338                             journal->j_trans_max + 1) >
4339                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4340                         if (((journal->j_start + journal->j_trans_max + 1) %
4341                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4342                             temp_jl->j_start) {
4343                                 flush_used_journal_lists(sb, temp_jl);
4344                                 goto first_jl;
4345                         } else {
4346                                 /*
4347                                 * we don't overlap anything from out start
4348                                 * to the end of the log, and our wrapped
4349                                 * portion doesn't overlap anything at
4350                                 * the start of the log.  We can break
4351                                 */
4352                                 break;
4353                         }
4354                 }
4355         }
4356
4357         journal->j_current_jl->j_list_bitmap =
4358             get_list_bitmap(sb, journal->j_current_jl);
4359
4360         if (!(journal->j_current_jl->j_list_bitmap)) {
4361                 reiserfs_panic(sb, "journal-1996",
4362                                "could not get a list bitmap");
4363         }
4364
4365         atomic_set(&journal->j_jlock, 0);
4366         unlock_journal(sb);
4367         /* wake up any body waiting to join. */
4368         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4369         wake_up(&journal->j_join_wait);
4370
4371         if (!flush && wait_on_commit &&
4372             journal_list_still_alive(sb, commit_trans_id)) {
4373                 flush_commit_list(sb, jl, 1);
4374         }
4375 out:
4376         reiserfs_check_lock_depth(sb, "journal end2");
4377
4378         memset(th, 0, sizeof(*th));
4379         /*
4380          * Re-set th->t_super, so we can properly keep track of how many
4381          * persistent transactions there are. We need to do this so if this
4382          * call is part of a failed restart_transaction, we can free it later
4383          */
4384         th->t_super = sb;
4385
4386         return journal->j_errno;
4387 }
4388
4389 /* Send the file system read only and refuse new transactions */
4390 void reiserfs_abort_journal(struct super_block *sb, int errno)
4391 {
4392         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4393         if (test_bit(J_ABORTED, &journal->j_state))
4394                 return;
4395
4396         if (!journal->j_errno)
4397                 journal->j_errno = errno;
4398
4399         sb->s_flags |= SB_RDONLY;
4400         set_bit(J_ABORTED, &journal->j_state);
4401
4402 #ifdef CONFIG_REISERFS_CHECK
4403         dump_stack();
4404 #endif
4405 }