fs/ocfs2/aops.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public
  17  * License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA.
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/slab.h>
  24 #include <linux/highmem.h>
  25 #include <linux/pagemap.h>
  26 #include <asm/byteorder.h>
  27 #include <linux/swap.h>
  28 #include <linux/pipe_fs_i.h>
  29 #include <linux/mpage.h>
  30 #include <linux/quotaops.h>
  31
  32 #include <cluster/masklog.h>
  33
  34 #include "ocfs2.h"
  35
  36 #include "alloc.h"
  37 #include "aops.h"
  38 #include "dlmglue.h"
  39 #include "extent_map.h"
  40 #include "file.h"
  41 #include "inode.h"
  42 #include "journal.h"
  43 #include "suballoc.h"
  44 #include "super.h"
  45 #include "symlink.h"
  46 #include "refcounttree.h"
  47 #include "ocfs2_trace.h"
  48
  49 #include "buffer_head_io.h"
  50
  51 static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
  52                                    struct buffer_head *bh_result, int create)
  53 {
  54         int err = -EIO;
  55         int status;
  56         struct ocfs2_dinode *fe = NULL;
  57         struct buffer_head *bh = NULL;
  58         struct buffer_head *buffer_cache_bh = NULL;
  59         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  60         void *kaddr;
  61
  62         trace_ocfs2_symlink_get_block(
  63                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
  64                         (unsigned long long)iblock, bh_result, create);
  65
  66         BUG_ON(ocfs2_inode_is_fast_symlink(inode));
  67
  68         if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
  69                 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
  70                      (unsigned long long)iblock);
  71                 goto bail;
  72         }
  73
  74         status = ocfs2_read_inode_block(inode, &bh);
  75         if (status < 0) {
  76                 mlog_errno(status);
  77                 goto bail;
  78         }
  79         fe = (struct ocfs2_dinode *) bh->b_data;
  80
  81         if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
  82                                                     le32_to_cpu(fe->i_clusters))) {
  83                 mlog(ML_ERROR, "block offset is outside the allocated size: "
  84                      "%llu\n", (unsigned long long)iblock);
  85                 goto bail;
  86         }
  87
  88         /* We don't use the page cache to create symlink data, so if
  89          * need be, copy it over from the buffer cache. */
  90         if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
  91                 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
  92                             iblock;
  93                 buffer_cache_bh = sb_getblk(osb->sb, blkno);
  94                 if (!buffer_cache_bh) {
  95                         mlog(ML_ERROR, "couldn't getblock for symlink!\n");
  96                         goto bail;
  97                 }
  98
  99                 /* we haven't locked out transactions, so a commit
 100                  * could've happened. Since we've got a reference on
 101                  * the bh, even if it commits while we're doing the
 102                  * copy, the data is still good. */
 103                 if (buffer_jbd(buffer_cache_bh)
 104                     && ocfs2_inode_is_new(inode)) {
 105                         kaddr = kmap_atomic(bh_result->b_page, KM_USER0);
 106                         if (!kaddr) {
 107                                 mlog(ML_ERROR, "couldn't kmap!\n");
 108                                 goto bail;
 109                         }
 110                         memcpy(kaddr + (bh_result->b_size * iblock),
 111                                buffer_cache_bh->b_data,
 112                                bh_result->b_size);
 113                         kunmap_atomic(kaddr, KM_USER0);
 114                         set_buffer_uptodate(bh_result);
 115                 }
 116                 brelse(buffer_cache_bh);
 117         }
 118
 119         map_bh(bh_result, inode->i_sb,
 120                le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
 121
 122         err = 0;
 123
 124 bail:
 125         brelse(bh);
 126
 127         return err;
 128 }
 129
 130 int ocfs2_get_block(struct inode *inode, sector_t iblock,
 131                     struct buffer_head *bh_result, int create)
 132 {
 133         int err = 0;
 134         unsigned int ext_flags;
 135         u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
 136         u64 p_blkno, count, past_eof;
 137         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 138
 139         trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
 140                               (unsigned long long)iblock, bh_result, create);
 141
 142         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
 143                 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
 144                      inode, inode->i_ino);
 145
 146         if (S_ISLNK(inode->i_mode)) {
 147                 /* this always does I/O for some reason. */
 148                 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
 149                 goto bail;
 150         }
 151
 152         err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
 153                                           &ext_flags);
 154         if (err) {
 155                 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
 156                      "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
 157                      (unsigned long long)p_blkno);
 158                 goto bail;
 159         }
 160
 161         if (max_blocks < count)
 162                 count = max_blocks;
 163
 164         /*
 165          * ocfs2 never allocates in this function - the only time we
 166          * need to use BH_New is when we're extending i_size on a file
 167          * system which doesn't support holes, in which case BH_New
 168          * allows __block_write_begin() to zero.
 169          *
 170          * If we see this on a sparse file system, then a truncate has
 171          * raced us and removed the cluster. In this case, we clear
 172          * the buffers dirty and uptodate bits and let the buffer code
 173          * ignore it as a hole.
 174          */
 175         if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
 176                 clear_buffer_dirty(bh_result);
 177                 clear_buffer_uptodate(bh_result);
 178                 goto bail;
 179         }
 180
 181         /* Treat the unwritten extent as a hole for zeroing purposes. */
 182         if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
 183                 map_bh(bh_result, inode->i_sb, p_blkno);
 184
 185         bh_result->b_size = count << inode->i_blkbits;
 186
 187         if (!ocfs2_sparse_alloc(osb)) {
 188                 if (p_blkno == 0) {
 189                         err = -EIO;
 190                         mlog(ML_ERROR,
 191                              "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
 192                              (unsigned long long)iblock,
 193                              (unsigned long long)p_blkno,
 194                              (unsigned long long)OCFS2_I(inode)->ip_blkno);
 195                         mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
 196                         dump_stack();
 197                         goto bail;
 198                 }
 199         }
 200
 201         past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
 202
 203         trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
 204                                   (unsigned long long)past_eof);
 205         if (create && (iblock >= past_eof))
 206                 set_buffer_new(bh_result);
 207
 208 bail:
 209         if (err < 0)
 210                 err = -EIO;
 211
 212         return err;
 213 }
 214
 215 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
 216                            struct buffer_head *di_bh)
 217 {
 218         void *kaddr;
 219         loff_t size;
 220         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 221
 222         if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
 223                 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
 224                             (unsigned long long)OCFS2_I(inode)->ip_blkno);
 225                 return -EROFS;
 226         }
 227
 228         size = i_size_read(inode);
 229
 230         if (size > PAGE_CACHE_SIZE ||
 231             size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
 232                 ocfs2_error(inode->i_sb,
 233                             "Inode %llu has with inline data has bad size: %Lu",
 234                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
 235                             (unsigned long long)size);
 236                 return -EROFS;
 237         }
 238
 239         kaddr = kmap_atomic(page, KM_USER0);
 240         if (size)
 241                 memcpy(kaddr, di->id2.i_data.id_data, size);
 242         /* Clear the remaining part of the page */
 243         memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
 244         flush_dcache_page(page);
 245         kunmap_atomic(kaddr, KM_USER0);
 246
 247         SetPageUptodate(page);
 248
 249         return 0;
 250 }
 251
 252 static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
 253 {
 254         int ret;
 255         struct buffer_head *di_bh = NULL;
 256
 257         BUG_ON(!PageLocked(page));
 258         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
 259
 260         ret = ocfs2_read_inode_block(inode, &di_bh);
 261         if (ret) {
 262                 mlog_errno(ret);
 263                 goto out;
 264         }
 265
 266         ret = ocfs2_read_inline_data(inode, page, di_bh);
 267 out:
 268         unlock_page(page);
 269
 270         brelse(di_bh);
 271         return ret;
 272 }
 273
 274 static int ocfs2_readpage(struct file *file, struct page *page)
 275 {
 276         struct inode *inode = page->mapping->host;
 277         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 278         loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
 279         int ret, unlock = 1;
 280
 281         trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
 282                              (page ? page->index : 0));
 283
 284         ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
 285         if (ret != 0) {
 286                 if (ret == AOP_TRUNCATED_PAGE)
 287                         unlock = 0;
 288                 mlog_errno(ret);
 289                 goto out;
 290         }
 291
 292         if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
 293                 ret = AOP_TRUNCATED_PAGE;
 294                 goto out_inode_unlock;
 295         }
 296
 297         /*
 298          * i_size might have just been updated as we grabed the meta lock.  We
 299          * might now be discovering a truncate that hit on another node.
 300          * block_read_full_page->get_block freaks out if it is asked to read
 301          * beyond the end of a file, so we check here.  Callers
 302          * (generic_file_read, vm_ops->fault) are clever enough to check i_size
 303          * and notice that the page they just read isn't needed.
 304          *
 305          * XXX sys_readahead() seems to get that wrong?
 306          */
 307         if (start >= i_size_read(inode)) {
 308                 zero_user(page, 0, PAGE_SIZE);
 309                 SetPageUptodate(page);
 310                 ret = 0;
 311                 goto out_alloc;
 312         }
 313
 314         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 315                 ret = ocfs2_readpage_inline(inode, page);
 316         else
 317                 ret = block_read_full_page(page, ocfs2_get_block);
 318         unlock = 0;
 319
 320 out_alloc:
 321         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 322 out_inode_unlock:
 323         ocfs2_inode_unlock(inode, 0);
 324 out:
 325         if (unlock)
 326                 unlock_page(page);
 327         return ret;
 328 }
 329
 330 /*
 331  * This is used only for read-ahead. Failures or difficult to handle
 332  * situations are safe to ignore.
 333  *
 334  * Right now, we don't bother with BH_Boundary - in-inode extent lists
 335  * are quite large (243 extents on 4k blocks), so most inodes don't
 336  * grow out to a tree. If need be, detecting boundary extents could
 337  * trivially be added in a future version of ocfs2_get_block().
 338  */
 339 static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
 340                            struct list_head *pages, unsigned nr_pages)
 341 {
 342         int ret, err = -EIO;
 343         struct inode *inode = mapping->host;
 344         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 345         loff_t start;
 346         struct page *last;
 347
 348         /*
 349          * Use the nonblocking flag for the dlm code to avoid page
 350          * lock inversion, but don't bother with retrying.
 351          */
 352         ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
 353         if (ret)
 354                 return err;
 355
 356         if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
 357                 ocfs2_inode_unlock(inode, 0);
 358                 return err;
 359         }
 360
 361         /*
 362          * Don't bother with inline-data. There isn't anything
 363          * to read-ahead in that case anyway...
 364          */
 365         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 366                 goto out_unlock;
 367
 368         /*
 369          * Check whether a remote node truncated this file - we just
 370          * drop out in that case as it's not worth handling here.
 371          */
 372         last = list_entry(pages->prev, struct page, lru);
 373         start = (loff_t)last->index << PAGE_CACHE_SHIFT;
 374         if (start >= i_size_read(inode))
 375                 goto out_unlock;
 376
 377         err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
 378
 379 out_unlock:
 380         up_read(&oi->ip_alloc_sem);
 381         ocfs2_inode_unlock(inode, 0);
 382
 383         return err;
 384 }
 385
 386 /* Note: Because we don't support holes, our allocation has
 387  * already happened (allocation writes zeros to the file data)
 388  * so we don't have to worry about ordered writes in
 389  * ocfs2_writepage.
 390  *
 391  * ->writepage is called during the process of invalidating the page cache
 392  * during blocked lock processing.  It can't block on any cluster locks
 393  * to during block mapping.  It's relying on the fact that the block
 394  * mapping can't have disappeared under the dirty pages that it is
 395  * being asked to write back.
 396  */
 397 static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
 398 {
 399         trace_ocfs2_writepage(
 400                 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
 401                 page->index);
 402
 403         return block_write_full_page(page, ocfs2_get_block, wbc);
 404 }
 405
 406 /* Taken from ext3. We don't necessarily need the full blown
 407  * functionality yet, but IMHO it's better to cut and paste the whole
 408  * thing so we can avoid introducing our own bugs (and easily pick up
 409  * their fixes when they happen) --Mark */
 410 int walk_page_buffers(  handle_t *handle,
 411                         struct buffer_head *head,
 412                         unsigned from,
 413                         unsigned to,
 414                         int *partial,
 415                         int (*fn)(      handle_t *handle,
 416                                         struct buffer_head *bh))
 417 {
 418         struct buffer_head *bh;
 419         unsigned block_start, block_end;
 420         unsigned blocksize = head->b_size;
 421         int err, ret = 0;
 422         struct buffer_head *next;
 423
 424         for (   bh = head, block_start = 0;
 425                 ret == 0 && (bh != head || !block_start);
 426                 block_start = block_end, bh = next)
 427         {
 428                 next = bh->b_this_page;
 429                 block_end = block_start + blocksize;
 430                 if (block_end <= from || block_start >= to) {
 431                         if (partial && !buffer_uptodate(bh))
 432                                 *partial = 1;
 433                         continue;
 434                 }
 435                 err = (*fn)(handle, bh);
 436                 if (!ret)
 437                         ret = err;
 438         }
 439         return ret;
 440 }
 441
 442 static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
 443 {
 444         sector_t status;
 445         u64 p_blkno = 0;
 446         int err = 0;
 447         struct inode *inode = mapping->host;
 448
 449         trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
 450                          (unsigned long long)block);
 451
 452         /* We don't need to lock journal system files, since they aren't
 453          * accessed concurrently from multiple nodes.
 454          */
 455         if (!INODE_JOURNAL(inode)) {
 456                 err = ocfs2_inode_lock(inode, NULL, 0);
 457                 if (err) {
 458                         if (err != -ENOENT)
 459                                 mlog_errno(err);
 460                         goto bail;
 461                 }
 462                 down_read(&OCFS2_I(inode)->ip_alloc_sem);
 463         }
 464
 465         if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
 466                 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
 467                                                   NULL);
 468
 469         if (!INODE_JOURNAL(inode)) {
 470                 up_read(&OCFS2_I(inode)->ip_alloc_sem);
 471                 ocfs2_inode_unlock(inode, 0);
 472         }
 473
 474         if (err) {
 475                 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
 476                      (unsigned long long)block);
 477                 mlog_errno(err);
 478                 goto bail;
 479         }
 480
 481 bail:
 482         status = err ? 0 : p_blkno;
 483
 484         return status;
 485 }
 486
 487 /*
 488  * TODO: Make this into a generic get_blocks function.
 489  *
 490  * From do_direct_io in direct-io.c:
 491  *  "So what we do is to permit the ->get_blocks function to populate
 492  *   bh.b_size with the size of IO which is permitted at this offset and
 493  *   this i_blkbits."
 494  *
 495  * This function is called directly from get_more_blocks in direct-io.c.
 496  *
 497  * called like this: dio->get_blocks(dio->inode, fs_startblk,
 498  *                                      fs_count, map_bh, dio->rw == WRITE);
 499  *
 500  * Note that we never bother to allocate blocks here, and thus ignore the
 501  * create argument.
 502  */
 503 static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
 504                                      struct buffer_head *bh_result, int create)
 505 {
 506         int ret;
 507         u64 p_blkno, inode_blocks, contig_blocks;
 508         unsigned int ext_flags;
 509         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 510         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 511
 512         /* This function won't even be called if the request isn't all
 513          * nicely aligned and of the right size, so there's no need
 514          * for us to check any of that. */
 515
 516         inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
 517
 518         /* This figures out the size of the next contiguous block, and
 519          * our logical offset */
 520         ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
 521                                           &contig_blocks, &ext_flags);
 522         if (ret) {
 523                 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
 524                      (unsigned long long)iblock);
 525                 ret = -EIO;
 526                 goto bail;
 527         }
 528
 529         /* We should already CoW the refcounted extent in case of create. */
 530         BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
 531
 532         /*
 533          * get_more_blocks() expects us to describe a hole by clearing
 534          * the mapped bit on bh_result().
 535          *
 536          * Consider an unwritten extent as a hole.
 537          */
 538         if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
 539                 map_bh(bh_result, inode->i_sb, p_blkno);
 540         else
 541                 clear_buffer_mapped(bh_result);
 542
 543         /* make sure we don't map more than max_blocks blocks here as
 544            that's all the kernel will handle at this point. */
 545         if (max_blocks < contig_blocks)
 546                 contig_blocks = max_blocks;
 547         bh_result->b_size = contig_blocks << blocksize_bits;
 548 bail:
 549         return ret;
 550 }
 551
 552 /*
 553  * ocfs2_dio_end_io is called by the dio core when a dio is finished.  We're
 554  * particularly interested in the aio/dio case.  Like the core uses
 555  * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from
 556  * truncation on another.
 557  */
 558 static void ocfs2_dio_end_io(struct kiocb *iocb,
 559                              loff_t offset,
 560                              ssize_t bytes,
 561                              void *private,
 562                              int ret,
 563                              bool is_async)
 564 {
 565         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 566         int level;
 567
 568         /* this io's submitter should not have unlocked this before we could */
 569         BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
 570
 571         if (ocfs2_iocb_is_sem_locked(iocb)) {
 572                 up_read(&inode->i_alloc_sem);
 573                 ocfs2_iocb_clear_sem_locked(iocb);
 574         }
 575
 576         ocfs2_iocb_clear_rw_locked(iocb);
 577
 578         level = ocfs2_iocb_rw_locked_level(iocb);
 579         ocfs2_rw_unlock(inode, level);
 580
 581         if (is_async)
 582                 aio_complete(iocb, ret, 0);
 583 }
 584
 585 /*
 586  * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
 587  * from ext3.  PageChecked() bits have been removed as OCFS2 does not
 588  * do journalled data.
 589  */
 590 static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
 591 {
 592         journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
 593
 594         jbd2_journal_invalidatepage(journal, page, offset);
 595 }
 596
 597 static int ocfs2_releasepage(struct page *page, gfp_t wait)
 598 {
 599         journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
 600
 601         if (!page_has_buffers(page))
 602                 return 0;
 603         return jbd2_journal_try_to_free_buffers(journal, page, wait);
 604 }
 605
 606 static ssize_t ocfs2_direct_IO(int rw,
 607                                struct kiocb *iocb,
 608                                const struct iovec *iov,
 609                                loff_t offset,
 610                                unsigned long nr_segs)
 611 {
 612         struct file *file = iocb->ki_filp;
 613         struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
 614
 615         /*
 616          * Fallback to buffered I/O if we see an inode without
 617          * extents.
 618          */
 619         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 620                 return 0;
 621
 622         /* Fallback to buffered I/O if we are appending. */
 623         if (i_size_read(inode) <= offset)
 624                 return 0;
 625
 626         return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
 627                                     iov, offset, nr_segs,
 628                                     ocfs2_direct_IO_get_blocks,
 629                                     ocfs2_dio_end_io, NULL, 0);
 630 }
 631
 632 static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
 633                                             u32 cpos,
 634                                             unsigned int *start,
 635                                             unsigned int *end)
 636 {
 637         unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
 638
 639         if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
 640                 unsigned int cpp;
 641
 642                 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
 643
 644                 cluster_start = cpos % cpp;
 645                 cluster_start = cluster_start << osb->s_clustersize_bits;
 646
 647                 cluster_end = cluster_start + osb->s_clustersize;
 648         }
 649
 650         BUG_ON(cluster_start > PAGE_SIZE);
 651         BUG_ON(cluster_end > PAGE_SIZE);
 652
 653         if (start)
 654                 *start = cluster_start;
 655         if (end)
 656                 *end = cluster_end;
 657 }
 658
 659 /*
 660  * 'from' and 'to' are the region in the page to avoid zeroing.
 661  *
 662  * If pagesize > clustersize, this function will avoid zeroing outside
 663  * of the cluster boundary.
 664  *
 665  * from == to == 0 is code for "zero the entire cluster region"
 666  */
 667 static void ocfs2_clear_page_regions(struct page *page,
 668                                      struct ocfs2_super *osb, u32 cpos,
 669                                      unsigned from, unsigned to)
 670 {
 671         void *kaddr;
 672         unsigned int cluster_start, cluster_end;
 673
 674         ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
 675
 676         kaddr = kmap_atomic(page, KM_USER0);
 677
 678         if (from || to) {
 679                 if (from > cluster_start)
 680                         memset(kaddr + cluster_start, 0, from - cluster_start);
 681                 if (to < cluster_end)
 682                         memset(kaddr + to, 0, cluster_end - to);
 683         } else {
 684                 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
 685         }
 686
 687         kunmap_atomic(kaddr, KM_USER0);
 688 }
 689
 690 /*
 691  * Nonsparse file systems fully allocate before we get to the write
 692  * code. This prevents ocfs2_write() from tagging the write as an
 693  * allocating one, which means ocfs2_map_page_blocks() might try to
 694  * read-in the blocks at the tail of our file. Avoid reading them by
 695  * testing i_size against each block offset.
 696  */
 697 static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
 698                                  unsigned int block_start)
 699 {
 700         u64 offset = page_offset(page) + block_start;
 701
 702         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
 703                 return 1;
 704
 705         if (i_size_read(inode) > offset)
 706                 return 1;
 707
 708         return 0;
 709 }
 710
 711 /*
 712  * Some of this taken from __block_write_begin(). We already have our
 713  * mapping by now though, and the entire write will be allocating or
 714  * it won't, so not much need to use BH_New.
 715  *
 716  * This will also skip zeroing, which is handled externally.
 717  */
 718 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
 719                           struct inode *inode, unsigned int from,
 720                           unsigned int to, int new)
 721 {
 722         int ret = 0;
 723         struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
 724         unsigned int block_end, block_start;
 725         unsigned int bsize = 1 << inode->i_blkbits;
 726
 727         if (!page_has_buffers(page))
 728                 create_empty_buffers(page, bsize, 0);
 729
 730         head = page_buffers(page);
 731         for (bh = head, block_start = 0; bh != head || !block_start;
 732              bh = bh->b_this_page, block_start += bsize) {
 733                 block_end = block_start + bsize;
 734
 735                 clear_buffer_new(bh);
 736
 737                 /*
 738                  * Ignore blocks outside of our i/o range -
 739                  * they may belong to unallocated clusters.
 740                  */
 741                 if (block_start >= to || block_end <= from) {
 742                         if (PageUptodate(page))
 743                                 set_buffer_uptodate(bh);
 744                         continue;
 745                 }
 746
 747                 /*
 748                  * For an allocating write with cluster size >= page
 749                  * size, we always write the entire page.
 750                  */
 751                 if (new)
 752                         set_buffer_new(bh);
 753
 754                 if (!buffer_mapped(bh)) {
 755                         map_bh(bh, inode->i_sb, *p_blkno);
 756                         unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
 757                 }
 758
 759                 if (PageUptodate(page)) {
 760                         if (!buffer_uptodate(bh))
 761                                 set_buffer_uptodate(bh);
 762                 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
 763                            !buffer_new(bh) &&
 764                            ocfs2_should_read_blk(inode, page, block_start) &&
 765                            (block_start < from || block_end > to)) {
 766                         ll_rw_block(READ, 1, &bh);
 767                         *wait_bh++=bh;
 768                 }
 769
 770                 *p_blkno = *p_blkno + 1;
 771         }
 772
 773         /*
 774          * If we issued read requests - let them complete.
 775          */
 776         while(wait_bh > wait) {
 777                 wait_on_buffer(*--wait_bh);
 778                 if (!buffer_uptodate(*wait_bh))
 779                         ret = -EIO;
 780         }
 781
 782         if (ret == 0 || !new)
 783                 return ret;
 784
 785         /*
 786          * If we get -EIO above, zero out any newly allocated blocks
 787          * to avoid exposing stale data.
 788          */
 789         bh = head;
 790         block_start = 0;
 791         do {
 792                 block_end = block_start + bsize;
 793                 if (block_end <= from)
 794                         goto next_bh;
 795                 if (block_start >= to)
 796                         break;
 797
 798                 zero_user(page, block_start, bh->b_size);
 799                 set_buffer_uptodate(bh);
 800                 mark_buffer_dirty(bh);
 801
 802 next_bh:
 803                 block_start = block_end;
 804                 bh = bh->b_this_page;
 805         } while (bh != head);
 806
 807         return ret;
 808 }
 809
 810 #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
 811 #define OCFS2_MAX_CTXT_PAGES    1
 812 #else
 813 #define OCFS2_MAX_CTXT_PAGES    (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
 814 #endif
 815
 816 #define OCFS2_MAX_CLUSTERS_PER_PAGE     (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
 817
 818 /*
 819  * Describe the state of a single cluster to be written to.
 820  */
 821 struct ocfs2_write_cluster_desc {
 822         u32             c_cpos;
 823         u32             c_phys;
 824         /*
 825          * Give this a unique field because c_phys eventually gets
 826          * filled.
 827          */
 828         unsigned        c_new;
 829         unsigned        c_unwritten;
 830         unsigned        c_needs_zero;
 831 };
 832
 833 struct ocfs2_write_ctxt {
 834         /* Logical cluster position / len of write */
 835         u32                             w_cpos;
 836         u32                             w_clen;
 837
 838         /* First cluster allocated in a nonsparse extend */
 839         u32                             w_first_new_cpos;
 840
 841         struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
 842
 843         /*
 844          * This is true if page_size > cluster_size.
 845          *
 846          * It triggers a set of special cases during write which might
 847          * have to deal with allocating writes to partial pages.
 848          */
 849         unsigned int                    w_large_pages;
 850
 851         /*
 852          * Pages involved in this write.
 853          *
 854          * w_target_page is the page being written to by the user.
 855          *
 856          * w_pages is an array of pages which always contains
 857          * w_target_page, and in the case of an allocating write with
 858          * page_size < cluster size, it will contain zero'd and mapped
 859          * pages adjacent to w_target_page which need to be written
 860          * out in so that future reads from that region will get
 861          * zero's.
 862          */
 863         unsigned int                    w_num_pages;
 864         struct page                     *w_pages[OCFS2_MAX_CTXT_PAGES];
 865         struct page                     *w_target_page;
 866
 867         /*
 868          * ocfs2_write_end() uses this to know what the real range to
 869          * write in the target should be.
 870          */
 871         unsigned int                    w_target_from;
 872         unsigned int                    w_target_to;
 873
 874         /*
 875          * We could use journal_current_handle() but this is cleaner,
 876          * IMHO -Mark
 877          */
 878         handle_t                        *w_handle;
 879
 880         struct buffer_head              *w_di_bh;
 881
 882         struct ocfs2_cached_dealloc_ctxt w_dealloc;
 883 };
 884
 885 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
 886 {
 887         int i;
 888
 889         for(i = 0; i < num_pages; i++) {
 890                 if (pages[i]) {
 891                         unlock_page(pages[i]);
 892                         mark_page_accessed(pages[i]);
 893                         page_cache_release(pages[i]);
 894                 }
 895         }
 896 }
 897
 898 static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
 899 {
 900         ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
 901
 902         brelse(wc->w_di_bh);
 903         kfree(wc);
 904 }
 905
 906 static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
 907                                   struct ocfs2_super *osb, loff_t pos,
 908                                   unsigned len, struct buffer_head *di_bh)
 909 {
 910         u32 cend;
 911         struct ocfs2_write_ctxt *wc;
 912
 913         wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
 914         if (!wc)
 915                 return -ENOMEM;
 916
 917         wc->w_cpos = pos >> osb->s_clustersize_bits;
 918         wc->w_first_new_cpos = UINT_MAX;
 919         cend = (pos + len - 1) >> osb->s_clustersize_bits;
 920         wc->w_clen = cend - wc->w_cpos + 1;
 921         get_bh(di_bh);
 922         wc->w_di_bh = di_bh;
 923
 924         if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
 925                 wc->w_large_pages = 1;
 926         else
 927                 wc->w_large_pages = 0;
 928
 929         ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
 930
 931         *wcp = wc;
 932
 933         return 0;
 934 }
 935
 936 /*
 937  * If a page has any new buffers, zero them out here, and mark them uptodate
 938  * and dirty so they'll be written out (in order to prevent uninitialised
 939  * block data from leaking). And clear the new bit.
 940  */
 941 static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
 942 {
 943         unsigned int block_start, block_end;
 944         struct buffer_head *head, *bh;
 945
 946         BUG_ON(!PageLocked(page));
 947         if (!page_has_buffers(page))
 948                 return;
 949
 950         bh = head = page_buffers(page);
 951         block_start = 0;
 952         do {
 953                 block_end = block_start + bh->b_size;
 954
 955                 if (buffer_new(bh)) {
 956                         if (block_end > from && block_start < to) {
 957                                 if (!PageUptodate(page)) {
 958                                         unsigned start, end;
 959
 960                                         start = max(from, block_start);
 961                                         end = min(to, block_end);
 962
 963                                         zero_user_segment(page, start, end);
 964                                         set_buffer_uptodate(bh);
 965                                 }
 966
 967                                 clear_buffer_new(bh);
 968                                 mark_buffer_dirty(bh);
 969                         }
 970                 }
 971
 972                 block_start = block_end;
 973                 bh = bh->b_this_page;
 974         } while (bh != head);
 975 }
 976
 977 /*
 978  * Only called when we have a failure during allocating write to write
 979  * zero's to the newly allocated region.
 980  */
 981 static void ocfs2_write_failure(struct inode *inode,
 982                                 struct ocfs2_write_ctxt *wc,
 983                                 loff_t user_pos, unsigned user_len)
 984 {
 985         int i;
 986         unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
 987                 to = user_pos + user_len;
 988         struct page *tmppage;
 989
 990         ocfs2_zero_new_buffers(wc->w_target_page, from, to);
 991
 992         for(i = 0; i < wc->w_num_pages; i++) {
 993                 tmppage = wc->w_pages[i];
 994
 995                 if (page_has_buffers(tmppage)) {
 996                         if (ocfs2_should_order_data(inode))
 997                                 ocfs2_jbd2_file_inode(wc->w_handle, inode);
 998
 999                         block_commit_write(tmppage, from, to);
1000                 }
1001         }
1002 }
1003
1004 static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1005                                         struct ocfs2_write_ctxt *wc,
1006                                         struct page *page, u32 cpos,
1007                                         loff_t user_pos, unsigned user_len,
1008                                         int new)
1009 {
1010         int ret;
1011         unsigned int map_from = 0, map_to = 0;
1012         unsigned int cluster_start, cluster_end;
1013         unsigned int user_data_from = 0, user_data_to = 0;
1014
1015         ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
1016                                         &cluster_start, &cluster_end);
1017
1018         /* treat the write as new if the a hole/lseek spanned across
1019          * the page boundary.
1020          */
1021         new = new | ((i_size_read(inode) <= page_offset(page)) &&
1022                         (page_offset(page) <= user_pos));
1023
1024         if (page == wc->w_target_page) {
1025                 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1026                 map_to = map_from + user_len;
1027
1028                 if (new)
1029                         ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1030                                                     cluster_start, cluster_end,
1031                                                     new);
1032                 else
1033                         ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1034                                                     map_from, map_to, new);
1035                 if (ret) {
1036                         mlog_errno(ret);
1037                         goto out;
1038                 }
1039
1040                 user_data_from = map_from;
1041                 user_data_to = map_to;
1042                 if (new) {
1043                         map_from = cluster_start;
1044                         map_to = cluster_end;
1045                 }
1046         } else {
1047                 /*
1048                  * If we haven't allocated the new page yet, we
1049                  * shouldn't be writing it out without copying user
1050                  * data. This is likely a math error from the caller.
1051                  */
1052                 BUG_ON(!new);
1053
1054                 map_from = cluster_start;
1055                 map_to = cluster_end;
1056
1057                 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1058                                             cluster_start, cluster_end, new);
1059                 if (ret) {
1060                         mlog_errno(ret);
1061                         goto out;
1062                 }
1063         }
1064
1065         /*
1066          * Parts of newly allocated pages need to be zero'd.
1067          *
1068          * Above, we have also rewritten 'to' and 'from' - as far as
1069          * the rest of the function is concerned, the entire cluster
1070          * range inside of a page needs to be written.
1071          *
1072          * We can skip this if the page is up to date - it's already
1073          * been zero'd from being read in as a hole.
1074          */
1075         if (new && !PageUptodate(page))
1076                 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1077                                          cpos, user_data_from, user_data_to);
1078
1079         flush_dcache_page(page);
1080
1081 out:
1082         return ret;
1083 }
1084
1085 /*
1086  * This function will only grab one clusters worth of pages.
1087  */
1088 static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1089                                       struct ocfs2_write_ctxt *wc,
1090                                       u32 cpos, loff_t user_pos,
1091                                       unsigned user_len, int new,
1092                                       struct page *mmap_page)
1093 {
1094         int ret = 0, i;
1095         unsigned long start, target_index, end_index, index;
1096         struct inode *inode = mapping->host;
1097         loff_t last_byte;
1098
1099         target_index = user_pos >> PAGE_CACHE_SHIFT;
1100
1101         /*
1102          * Figure out how many pages we'll be manipulating here. For
1103          * non allocating write, we just change the one
1104          * page. Otherwise, we'll need a whole clusters worth.  If we're
1105          * writing past i_size, we only need enough pages to cover the
1106          * last page of the write.
1107          */
1108         if (new) {
1109                 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1110                 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1111                 /*
1112                  * We need the index *past* the last page we could possibly
1113                  * touch.  This is the page past the end of the write or
1114                  * i_size, whichever is greater.
1115                  */
1116                 last_byte = max(user_pos + user_len, i_size_read(inode));
1117                 BUG_ON(last_byte < 1);
1118                 end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
1119                 if ((start + wc->w_num_pages) > end_index)
1120                         wc->w_num_pages = end_index - start;
1121         } else {
1122                 wc->w_num_pages = 1;
1123                 start = target_index;
1124         }
1125
1126         for(i = 0; i < wc->w_num_pages; i++) {
1127                 index = start + i;
1128
1129                 if (index == target_index && mmap_page) {
1130                         /*
1131                          * ocfs2_pagemkwrite() is a little different
1132                          * and wants us to directly use the page
1133                          * passed in.
1134                          */
1135                         lock_page(mmap_page);
1136
1137                         if (mmap_page->mapping != mapping) {
1138                                 unlock_page(mmap_page);
1139                                 /*
1140                                  * Sanity check - the locking in
1141                                  * ocfs2_pagemkwrite() should ensure
1142                                  * that this code doesn't trigger.
1143                                  */
1144                                 ret = -EINVAL;
1145                                 mlog_errno(ret);
1146                                 goto out;
1147                         }
1148
1149                         page_cache_get(mmap_page);
1150                         wc->w_pages[i] = mmap_page;
1151                 } else {
1152                         wc->w_pages[i] = find_or_create_page(mapping, index,
1153                                                              GFP_NOFS);
1154                         if (!wc->w_pages[i]) {
1155                                 ret = -ENOMEM;
1156                                 mlog_errno(ret);
1157                                 goto out;
1158                         }
1159                 }
1160
1161                 if (index == target_index)
1162                         wc->w_target_page = wc->w_pages[i];
1163         }
1164 out:
1165         return ret;
1166 }
1167
1168 /*
1169  * Prepare a single cluster for write one cluster into the file.
1170  */
1171 static int ocfs2_write_cluster(struct address_space *mapping,
1172                                u32 phys, unsigned int unwritten,
1173                                unsigned int should_zero,
1174                                struct ocfs2_alloc_context *data_ac,
1175                                struct ocfs2_alloc_context *meta_ac,
1176                                struct ocfs2_write_ctxt *wc, u32 cpos,
1177                                loff_t user_pos, unsigned user_len)
1178 {
1179         int ret, i, new;
1180         u64 v_blkno, p_blkno;
1181         struct inode *inode = mapping->host;
1182         struct ocfs2_extent_tree et;
1183
1184         new = phys == 0 ? 1 : 0;
1185         if (new) {
1186                 u32 tmp_pos;
1187
1188                 /*
1189                  * This is safe to call with the page locks - it won't take
1190                  * any additional semaphores or cluster locks.
1191                  */
1192                 tmp_pos = cpos;
1193                 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1194                                            &tmp_pos, 1, 0, wc->w_di_bh,
1195                                            wc->w_handle, data_ac,
1196                                            meta_ac, NULL);
1197                 /*
1198                  * This shouldn't happen because we must have already
1199                  * calculated the correct meta data allocation required. The
1200                  * internal tree allocation code should know how to increase
1201                  * transaction credits itself.
1202                  *
1203                  * If need be, we could handle -EAGAIN for a
1204                  * RESTART_TRANS here.
1205                  */
1206                 mlog_bug_on_msg(ret == -EAGAIN,
1207                                 "Inode %llu: EAGAIN return during allocation.\n",
1208                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1209                 if (ret < 0) {
1210                         mlog_errno(ret);
1211                         goto out;
1212                 }
1213         } else if (unwritten) {
1214                 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1215                                               wc->w_di_bh);
1216                 ret = ocfs2_mark_extent_written(inode, &et,
1217                                                 wc->w_handle, cpos, 1, phys,
1218                                                 meta_ac, &wc->w_dealloc);
1219                 if (ret < 0) {
1220                         mlog_errno(ret);
1221                         goto out;
1222                 }
1223         }
1224
1225         if (should_zero)
1226                 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1227         else
1228                 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1229
1230         /*
1231          * The only reason this should fail is due to an inability to
1232          * find the extent added.
1233          */
1234         ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1235                                           NULL);
1236         if (ret < 0) {
1237                 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1238                             "at logical block %llu",
1239                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1240                             (unsigned long long)v_blkno);
1241                 goto out;
1242         }
1243
1244         BUG_ON(p_blkno == 0);
1245
1246         for(i = 0; i < wc->w_num_pages; i++) {
1247                 int tmpret;
1248
1249                 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1250                                                       wc->w_pages[i], cpos,
1251                                                       user_pos, user_len,
1252                                                       should_zero);
1253                 if (tmpret) {
1254                         mlog_errno(tmpret);
1255                         if (ret == 0)
1256                                 ret = tmpret;
1257                 }
1258         }
1259
1260         /*
1261          * We only have cleanup to do in case of allocating write.
1262          */
1263         if (ret && new)
1264                 ocfs2_write_failure(inode, wc, user_pos, user_len);
1265
1266 out:
1267
1268         return ret;
1269 }
1270
1271 static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1272                                        struct ocfs2_alloc_context *data_ac,
1273                                        struct ocfs2_alloc_context *meta_ac,
1274                                        struct ocfs2_write_ctxt *wc,
1275                                        loff_t pos, unsigned len)
1276 {
1277         int ret, i;
1278         loff_t cluster_off;
1279         unsigned int local_len = len;
1280         struct ocfs2_write_cluster_desc *desc;
1281         struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1282
1283         for (i = 0; i < wc->w_clen; i++) {
1284                 desc = &wc->w_desc[i];
1285
1286                 /*
1287                  * We have to make sure that the total write passed in
1288                  * doesn't extend past a single cluster.
1289                  */
1290                 local_len = len;
1291                 cluster_off = pos & (osb->s_clustersize - 1);
1292                 if ((cluster_off + local_len) > osb->s_clustersize)
1293                         local_len = osb->s_clustersize - cluster_off;
1294
1295                 ret = ocfs2_write_cluster(mapping, desc->c_phys,
1296                                           desc->c_unwritten,
1297                                           desc->c_needs_zero,
1298                                           data_ac, meta_ac,
1299                                           wc, desc->c_cpos, pos, local_len);
1300                 if (ret) {
1301                         mlog_errno(ret);
1302                         goto out;
1303                 }
1304
1305                 len -= local_len;
1306                 pos += local_len;
1307         }
1308
1309         ret = 0;
1310 out:
1311         return ret;
1312 }
1313
1314 /*
1315  * ocfs2_write_end() wants to know which parts of the target page it
1316  * should complete the write on. It's easiest to compute them ahead of
1317  * time when a more complete view of the write is available.
1318  */
1319 static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1320                                         struct ocfs2_write_ctxt *wc,
1321                                         loff_t pos, unsigned len, int alloc)
1322 {
1323         struct ocfs2_write_cluster_desc *desc;
1324
1325         wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1326         wc->w_target_to = wc->w_target_from + len;
1327
1328         if (alloc == 0)
1329                 return;
1330
1331         /*
1332          * Allocating write - we may have different boundaries based
1333          * on page size and cluster size.
1334          *
1335          * NOTE: We can no longer compute one value from the other as
1336          * the actual write length and user provided length may be
1337          * different.
1338          */
1339
1340         if (wc->w_large_pages) {
1341                 /*
1342                  * We only care about the 1st and last cluster within
1343                  * our range and whether they should be zero'd or not. Either
1344                  * value may be extended out to the start/end of a
1345                  * newly allocated cluster.
1346                  */
1347                 desc = &wc->w_desc[0];
1348                 if (desc->c_needs_zero)
1349                         ocfs2_figure_cluster_boundaries(osb,
1350                                                         desc->c_cpos,
1351                                                         &wc->w_target_from,
1352                                                         NULL);
1353
1354                 desc = &wc->w_desc[wc->w_clen - 1];
1355                 if (desc->c_needs_zero)
1356                         ocfs2_figure_cluster_boundaries(osb,
1357                                                         desc->c_cpos,
1358                                                         NULL,
1359                                                         &wc->w_target_to);
1360         } else {
1361                 wc->w_target_from = 0;
1362                 wc->w_target_to = PAGE_CACHE_SIZE;
1363         }
1364 }
1365
1366 /*
1367  * Populate each single-cluster write descriptor in the write context
1368  * with information about the i/o to be done.
1369  *
1370  * Returns the number of clusters that will have to be allocated, as
1371  * well as a worst case estimate of the number of extent records that
1372  * would have to be created during a write to an unwritten region.
1373  */
1374 static int ocfs2_populate_write_desc(struct inode *inode,
1375                                      struct ocfs2_write_ctxt *wc,
1376                                      unsigned int *clusters_to_alloc,
1377                                      unsigned int *extents_to_split)
1378 {
1379         int ret;
1380         struct ocfs2_write_cluster_desc *desc;
1381         unsigned int num_clusters = 0;
1382         unsigned int ext_flags = 0;
1383         u32 phys = 0;
1384         int i;
1385
1386         *clusters_to_alloc = 0;
1387         *extents_to_split = 0;
1388
1389         for (i = 0; i < wc->w_clen; i++) {
1390                 desc = &wc->w_desc[i];
1391                 desc->c_cpos = wc->w_cpos + i;
1392
1393                 if (num_clusters == 0) {
1394                         /*
1395                          * Need to look up the next extent record.
1396                          */
1397                         ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1398                                                  &num_clusters, &ext_flags);
1399                         if (ret) {
1400                                 mlog_errno(ret);
1401                                 goto out;
1402                         }
1403
1404                         /* We should already CoW the refcountd extent. */
1405                         BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1406
1407                         /*
1408                          * Assume worst case - that we're writing in
1409                          * the middle of the extent.
1410                          *
1411                          * We can assume that the write proceeds from
1412                          * left to right, in which case the extent
1413                          * insert code is smart enough to coalesce the
1414                          * next splits into the previous records created.
1415                          */
1416                         if (ext_flags & OCFS2_EXT_UNWRITTEN)
1417                                 *extents_to_split = *extents_to_split + 2;
1418                 } else if (phys) {
1419                         /*
1420                          * Only increment phys if it doesn't describe
1421                          * a hole.
1422                          */
1423                         phys++;
1424                 }
1425
1426                 /*
1427                  * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1428                  * file that got extended.  w_first_new_cpos tells us
1429                  * where the newly allocated clusters are so we can
1430                  * zero them.
1431                  */
1432                 if (desc->c_cpos >= wc->w_first_new_cpos) {
1433                         BUG_ON(phys == 0);
1434                         desc->c_needs_zero = 1;
1435                 }
1436
1437                 desc->c_phys = phys;
1438                 if (phys == 0) {
1439                         desc->c_new = 1;
1440                         desc->c_needs_zero = 1;
1441                         *clusters_to_alloc = *clusters_to_alloc + 1;
1442                 }
1443
1444                 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
1445                         desc->c_unwritten = 1;
1446                         desc->c_needs_zero = 1;
1447                 }
1448
1449                 num_clusters--;
1450         }
1451
1452         ret = 0;
1453 out:
1454         return ret;
1455 }
1456
1457 static int ocfs2_write_begin_inline(struct address_space *mapping,
1458                                     struct inode *inode,
1459                                     struct ocfs2_write_ctxt *wc)
1460 {
1461         int ret;
1462         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1463         struct page *page;
1464         handle_t *handle;
1465         struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1466
1467         page = find_or_create_page(mapping, 0, GFP_NOFS);
1468         if (!page) {
1469                 ret = -ENOMEM;
1470                 mlog_errno(ret);
1471                 goto out;
1472         }
1473         /*
1474          * If we don't set w_num_pages then this page won't get unlocked
1475          * and freed on cleanup of the write context.
1476          */
1477         wc->w_pages[0] = wc->w_target_page = page;
1478         wc->w_num_pages = 1;
1479
1480         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1481         if (IS_ERR(handle)) {
1482                 ret = PTR_ERR(handle);
1483                 mlog_errno(ret);
1484                 goto out;
1485         }
1486
1487         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1488                                       OCFS2_JOURNAL_ACCESS_WRITE);
1489         if (ret) {
1490                 ocfs2_commit_trans(osb, handle);
1491
1492                 mlog_errno(ret);
1493                 goto out;
1494         }
1495
1496         if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1497                 ocfs2_set_inode_data_inline(inode, di);
1498
1499         if (!PageUptodate(page)) {
1500                 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1501                 if (ret) {
1502                         ocfs2_commit_trans(osb, handle);
1503
1504                         goto out;
1505                 }
1506         }
1507
1508         wc->w_handle = handle;
1509 out:
1510         return ret;
1511 }
1512
1513 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1514 {
1515         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1516
1517         if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1518                 return 1;
1519         return 0;
1520 }
1521
1522 static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1523                                           struct inode *inode, loff_t pos,
1524                                           unsigned len, struct page *mmap_page,
1525                                           struct ocfs2_write_ctxt *wc)
1526 {
1527         int ret, written = 0;
1528         loff_t end = pos + len;
1529         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1530         struct ocfs2_dinode *di = NULL;
1531
1532         trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1533                                              len, (unsigned long long)pos,
1534                                              oi->ip_dyn_features);
1535
1536         /*
1537          * Handle inodes which already have inline data 1st.
1538          */
1539         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1540                 if (mmap_page == NULL &&
1541                     ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1542                         goto do_inline_write;
1543
1544                 /*
1545                  * The write won't fit - we have to give this inode an
1546                  * inline extent list now.
1547                  */
1548                 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1549                 if (ret)
1550                         mlog_errno(ret);
1551                 goto out;
1552         }
1553
1554         /*
1555          * Check whether the inode can accept inline data.
1556          */
1557         if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1558                 return 0;
1559
1560         /*
1561          * Check whether the write can fit.
1562          */
1563         di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1564         if (mmap_page ||
1565             end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
1566                 return 0;
1567
1568 do_inline_write:
1569         ret = ocfs2_write_begin_inline(mapping, inode, wc);
1570         if (ret) {
1571                 mlog_errno(ret);
1572                 goto out;
1573         }
1574
1575         /*
1576          * This signals to the caller that the data can be written
1577          * inline.
1578          */
1579         written = 1;
1580 out:
1581         return written ? written : ret;
1582 }
1583
1584 /*
1585  * This function only does anything for file systems which can't
1586  * handle sparse files.
1587  *
1588  * What we want to do here is fill in any hole between the current end
1589  * of allocation and the end of our write. That way the rest of the
1590  * write path can treat it as an non-allocating write, which has no
1591  * special case code for sparse/nonsparse files.
1592  */
1593 static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1594                                         struct buffer_head *di_bh,
1595                                         loff_t pos, unsigned len,
1596                                         struct ocfs2_write_ctxt *wc)
1597 {
1598         int ret;
1599         loff_t newsize = pos + len;
1600
1601         BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1602
1603         if (newsize <= i_size_read(inode))
1604                 return 0;
1605
1606         ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
1607         if (ret)
1608                 mlog_errno(ret);
1609
1610         wc->w_first_new_cpos =
1611                 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1612
1613         return ret;
1614 }
1615
1616 static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1617                            loff_t pos)
1618 {
1619         int ret = 0;
1620
1621         BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1622         if (pos > i_size_read(inode))
1623                 ret = ocfs2_zero_extend(inode, di_bh, pos);
1624
1625         return ret;
1626 }
1627
1628 /*
1629  * Try to flush truncate logs if we can free enough clusters from it.
1630  * As for return value, "< 0" means error, "0" no space and "1" means
1631  * we have freed enough spaces and let the caller try to allocate again.
1632  */
1633 static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
1634                                           unsigned int needed)
1635 {
1636         tid_t target;
1637         int ret = 0;
1638         unsigned int truncated_clusters;
1639
1640         mutex_lock(&osb->osb_tl_inode->i_mutex);
1641         truncated_clusters = osb->truncated_clusters;
1642         mutex_unlock(&osb->osb_tl_inode->i_mutex);
1643
1644         /*
1645          * Check whether we can succeed in allocating if we free
1646          * the truncate log.
1647          */
1648         if (truncated_clusters < needed)
1649                 goto out;
1650
1651         ret = ocfs2_flush_truncate_log(osb);
1652         if (ret) {
1653                 mlog_errno(ret);
1654                 goto out;
1655         }
1656
1657         if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
1658                 jbd2_log_wait_commit(osb->journal->j_journal, target);
1659                 ret = 1;
1660         }
1661 out:
1662         return ret;
1663 }
1664
1665 int ocfs2_write_begin_nolock(struct file *filp,
1666                              struct address_space *mapping,
1667                              loff_t pos, unsigned len, unsigned flags,
1668                              struct page **pagep, void **fsdata,
1669                              struct buffer_head *di_bh, struct page *mmap_page)
1670 {
1671         int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
1672         unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
1673         struct ocfs2_write_ctxt *wc;
1674         struct inode *inode = mapping->host;
1675         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1676         struct ocfs2_dinode *di;
1677         struct ocfs2_alloc_context *data_ac = NULL;
1678         struct ocfs2_alloc_context *meta_ac = NULL;
1679         handle_t *handle;
1680         struct ocfs2_extent_tree et;
1681         int try_free = 1, ret1;
1682
1683 try_again:
1684         ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1685         if (ret) {
1686                 mlog_errno(ret);
1687                 return ret;
1688         }
1689
1690         if (ocfs2_supports_inline_data(osb)) {
1691                 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1692                                                      mmap_page, wc);
1693                 if (ret == 1) {
1694                         ret = 0;
1695                         goto success;
1696                 }
1697                 if (ret < 0) {
1698                         mlog_errno(ret);
1699                         goto out;
1700                 }
1701         }
1702
1703         if (ocfs2_sparse_alloc(osb))
1704                 ret = ocfs2_zero_tail(inode, di_bh, pos);
1705         else
1706                 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
1707                                                    wc);
1708         if (ret) {
1709                 mlog_errno(ret);
1710                 goto out;
1711         }
1712
1713         ret = ocfs2_check_range_for_refcount(inode, pos, len);
1714         if (ret < 0) {
1715                 mlog_errno(ret);
1716                 goto out;
1717         } else if (ret == 1) {
1718                 clusters_need = wc->w_clen;
1719                 ret = ocfs2_refcount_cow(inode, filp, di_bh,
1720                                          wc->w_cpos, wc->w_clen, UINT_MAX);
1721                 if (ret) {
1722                         mlog_errno(ret);
1723                         goto out;
1724                 }
1725         }
1726
1727         ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1728                                         &extents_to_split);
1729         if (ret) {
1730                 mlog_errno(ret);
1731                 goto out;
1732         }
1733         clusters_need += clusters_to_alloc;
1734
1735         di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1736
1737         trace_ocfs2_write_begin_nolock(
1738                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1739                         (long long)i_size_read(inode),
1740                         le32_to_cpu(di->i_clusters),
1741                         pos, len, flags, mmap_page,
1742                         clusters_to_alloc, extents_to_split);
1743
1744         /*
1745          * We set w_target_from, w_target_to here so that
1746          * ocfs2_write_end() knows which range in the target page to
1747          * write out. An allocation requires that we write the entire
1748          * cluster range.
1749          */
1750         if (clusters_to_alloc || extents_to_split) {
1751                 /*
1752                  * XXX: We are stretching the limits of
1753                  * ocfs2_lock_allocators(). It greatly over-estimates
1754                  * the work to be done.
1755                  */
1756                 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1757                                               wc->w_di_bh);
1758                 ret = ocfs2_lock_allocators(inode, &et,
1759                                             clusters_to_alloc, extents_to_split,
1760                                             &data_ac, &meta_ac);
1761                 if (ret) {
1762                         mlog_errno(ret);
1763                         goto out;
1764                 }
1765
1766                 if (data_ac)
1767                         data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1768
1769                 credits = ocfs2_calc_extend_credits(inode->i_sb,
1770                                                     &di->id2.i_list,
1771                                                     clusters_to_alloc);
1772
1773         }
1774
1775         /*
1776          * We have to zero sparse allocated clusters, unwritten extent clusters,
1777          * and non-sparse clusters we just extended.  For non-sparse writes,
1778          * we know zeros will only be needed in the first and/or last cluster.
1779          */
1780         if (clusters_to_alloc || extents_to_split ||
1781             (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1782                             wc->w_desc[wc->w_clen - 1].c_needs_zero)))
1783                 cluster_of_pages = 1;
1784         else
1785                 cluster_of_pages = 0;
1786
1787         ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
1788
1789         handle = ocfs2_start_trans(osb, credits);
1790         if (IS_ERR(handle)) {
1791                 ret = PTR_ERR(handle);
1792                 mlog_errno(ret);
1793                 goto out;
1794         }
1795
1796         wc->w_handle = handle;
1797
1798         if (clusters_to_alloc) {
1799                 ret = dquot_alloc_space_nodirty(inode,
1800                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1801                 if (ret)
1802                         goto out_commit;
1803         }
1804         /*
1805          * We don't want this to fail in ocfs2_write_end(), so do it
1806          * here.
1807          */
1808         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1809                                       OCFS2_JOURNAL_ACCESS_WRITE);
1810         if (ret) {
1811                 mlog_errno(ret);
1812                 goto out_quota;
1813         }
1814
1815         /*
1816          * Fill our page array first. That way we've grabbed enough so
1817          * that we can zero and flush if we error after adding the
1818          * extent.
1819          */
1820         ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
1821                                          cluster_of_pages, mmap_page);
1822         if (ret) {
1823                 mlog_errno(ret);
1824                 goto out_quota;
1825         }
1826
1827         ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1828                                           len);
1829         if (ret) {
1830                 mlog_errno(ret);
1831                 goto out_quota;
1832         }
1833
1834         if (data_ac)
1835                 ocfs2_free_alloc_context(data_ac);
1836         if (meta_ac)
1837                 ocfs2_free_alloc_context(meta_ac);
1838
1839 success:
1840         *pagep = wc->w_target_page;
1841         *fsdata = wc;
1842         return 0;
1843 out_quota:
1844         if (clusters_to_alloc)
1845                 dquot_free_space(inode,
1846                           ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1847 out_commit:
1848         ocfs2_commit_trans(osb, handle);
1849
1850 out:
1851         ocfs2_free_write_ctxt(wc);
1852
1853         if (data_ac)
1854                 ocfs2_free_alloc_context(data_ac);
1855         if (meta_ac)
1856                 ocfs2_free_alloc_context(meta_ac);
1857
1858         if (ret == -ENOSPC && try_free) {
1859                 /*
1860                  * Try to free some truncate log so that we can have enough
1861                  * clusters to allocate.
1862                  */
1863                 try_free = 0;
1864
1865                 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1866                 if (ret1 == 1)
1867                         goto try_again;
1868
1869                 if (ret1 < 0)
1870                         mlog_errno(ret1);
1871         }
1872
1873         return ret;
1874 }
1875
1876 static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1877                              loff_t pos, unsigned len, unsigned flags,
1878                              struct page **pagep, void **fsdata)
1879 {
1880         int ret;
1881         struct buffer_head *di_bh = NULL;
1882         struct inode *inode = mapping->host;
1883
1884         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1885         if (ret) {
1886                 mlog_errno(ret);
1887                 return ret;
1888         }
1889
1890         /*
1891          * Take alloc sem here to prevent concurrent lookups. That way
1892          * the mapping, zeroing and tree manipulation within
1893          * ocfs2_write() will be safe against ->readpage(). This
1894          * should also serve to lock out allocation from a shared
1895          * writeable region.
1896          */
1897         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1898
1899         ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
1900                                        fsdata, di_bh, NULL);
1901         if (ret) {
1902                 mlog_errno(ret);
1903                 goto out_fail;
1904         }
1905
1906         brelse(di_bh);
1907
1908         return 0;
1909
1910 out_fail:
1911         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1912
1913         brelse(di_bh);
1914         ocfs2_inode_unlock(inode, 1);
1915
1916         return ret;
1917 }
1918
1919 static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1920                                    unsigned len, unsigned *copied,
1921                                    struct ocfs2_dinode *di,
1922                                    struct ocfs2_write_ctxt *wc)
1923 {
1924         void *kaddr;
1925
1926         if (unlikely(*copied < len)) {
1927                 if (!PageUptodate(wc->w_target_page)) {
1928                         *copied = 0;
1929                         return;
1930                 }
1931         }
1932
1933         kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
1934         memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1935         kunmap_atomic(kaddr, KM_USER0);
1936
1937         trace_ocfs2_write_end_inline(
1938              (unsigned long long)OCFS2_I(inode)->ip_blkno,
1939              (unsigned long long)pos, *copied,
1940              le16_to_cpu(di->id2.i_data.id_count),
1941              le16_to_cpu(di->i_dyn_features));
1942 }
1943
1944 int ocfs2_write_end_nolock(struct address_space *mapping,
1945                            loff_t pos, unsigned len, unsigned copied,
1946                            struct page *page, void *fsdata)
1947 {
1948         int i;
1949         unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
1950         struct inode *inode = mapping->host;
1951         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1952         struct ocfs2_write_ctxt *wc = fsdata;
1953         struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1954         handle_t *handle = wc->w_handle;
1955         struct page *tmppage;
1956
1957         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1958                 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1959                 goto out_write_size;
1960         }
1961
1962         if (unlikely(copied < len)) {
1963                 if (!PageUptodate(wc->w_target_page))
1964                         copied = 0;
1965
1966                 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1967                                        start+len);
1968         }
1969         flush_dcache_page(wc->w_target_page);
1970
1971         for(i = 0; i < wc->w_num_pages; i++) {
1972                 tmppage = wc->w_pages[i];
1973
1974                 if (tmppage == wc->w_target_page) {
1975                         from = wc->w_target_from;
1976                         to = wc->w_target_to;
1977
1978                         BUG_ON(from > PAGE_CACHE_SIZE ||
1979                                to > PAGE_CACHE_SIZE ||
1980                                to < from);
1981                 } else {
1982                         /*
1983                          * Pages adjacent to the target (if any) imply
1984                          * a hole-filling write in which case we want
1985                          * to flush their entire range.
1986                          */
1987                         from = 0;
1988                         to = PAGE_CACHE_SIZE;
1989                 }
1990
1991                 if (page_has_buffers(tmppage)) {
1992                         if (ocfs2_should_order_data(inode))
1993                                 ocfs2_jbd2_file_inode(wc->w_handle, inode);
1994                         block_commit_write(tmppage, from, to);
1995                 }
1996         }
1997
1998 out_write_size:
1999         pos += copied;
2000         if (pos > inode->i_size) {
2001                 i_size_write(inode, pos);
2002                 mark_inode_dirty(inode);
2003         }
2004         inode->i_blocks = ocfs2_inode_sector_count(inode);
2005         di->i_size = cpu_to_le64((u64)i_size_read(inode));
2006         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2007         di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2008         di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
2009         ocfs2_journal_dirty(handle, wc->w_di_bh);
2010
2011         ocfs2_commit_trans(osb, handle);
2012
2013         ocfs2_run_deallocs(osb, &wc->w_dealloc);
2014
2015         ocfs2_free_write_ctxt(wc);
2016
2017         return copied;
2018 }
2019
2020 static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2021                            loff_t pos, unsigned len, unsigned copied,
2022                            struct page *page, void *fsdata)
2023 {
2024         int ret;
2025         struct inode *inode = mapping->host;
2026
2027         ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
2028
2029         up_write(&OCFS2_I(inode)->ip_alloc_sem);
2030         ocfs2_inode_unlock(inode, 1);
2031
2032         return ret;
2033 }
2034
2035 const struct address_space_operations ocfs2_aops = {
2036         .readpage               = ocfs2_readpage,
2037         .readpages              = ocfs2_readpages,
2038         .writepage              = ocfs2_writepage,
2039         .write_begin            = ocfs2_write_begin,
2040         .write_end              = ocfs2_write_end,
2041         .bmap                   = ocfs2_bmap,
2042         .direct_IO              = ocfs2_direct_IO,
2043         .invalidatepage         = ocfs2_invalidatepage,
2044         .releasepage            = ocfs2_releasepage,
2045         .migratepage            = buffer_migrate_page,
2046         .is_partially_uptodate  = block_is_partially_uptodate,
2047         .error_remove_page      = generic_error_remove_page,
2048 };