fs/ocfs2/quota_global.c

   1 /*
   2  *  Implementation of operations over global quota file
   3  */
   4 #include <linux/spinlock.h>
   5 #include <linux/fs.h>
   6 #include <linux/slab.h>
   7 #include <linux/quota.h>
   8 #include <linux/quotaops.h>
   9 #include <linux/dqblk_qtree.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/writeback.h>
  12 #include <linux/workqueue.h>
  13
  14 #define MLOG_MASK_PREFIX ML_QUOTA
  15 #include <cluster/masklog.h>
  16
  17 #include "ocfs2_fs.h"
  18 #include "ocfs2.h"
  19 #include "alloc.h"
  20 #include "blockcheck.h"
  21 #include "inode.h"
  22 #include "journal.h"
  23 #include "file.h"
  24 #include "sysfile.h"
  25 #include "dlmglue.h"
  26 #include "uptodate.h"
  27 #include "super.h"
  28 #include "buffer_head_io.h"
  29 #include "quota.h"
  30
  31 /*
  32  * Locking of quotas with OCFS2 is rather complex. Here are rules that
  33  * should be obeyed by all the functions:
  34  * - any write of quota structure (either to local or global file) is protected
  35  *   by dqio_mutex or dquot->dq_lock.
  36  * - any modification of global quota file holds inode cluster lock, i_mutex,
  37  *   and ip_alloc_sem of the global quota file (achieved by
  38  *   ocfs2_lock_global_qf). It also has to hold qinfo_lock.
  39  * - an allocation of new blocks for local quota file is protected by
  40  *   its ip_alloc_sem
  41  *
  42  * A rough sketch of locking dependencies (lf = local file, gf = global file):
  43  * Normal filesystem operation:
  44  *   start_trans -> dqio_mutex -> write to lf
  45  * Syncing of local and global file:
  46  *   ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
  47  *     write to gf
  48  *                                                     -> write to lf
  49  * Acquire dquot for the first time:
  50  *   dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
  51  *                                   -> alloc space for gf
  52  *                                   -> start_trans -> qinfo_lock -> write to gf
  53  *           -> ip_alloc_sem of lf -> alloc space for lf
  54  *           -> write to lf
  55  * Release last reference to dquot:
  56  *   dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
  57  *           -> write to lf
  58  * Note that all the above operations also hold the inode cluster lock of lf.
  59  * Recovery:
  60  *   inode cluster lock of recovered lf
  61  *     -> read bitmaps -> ip_alloc_sem of lf
  62  *     -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
  63  *        write to gf
  64  */
  65
  66 static struct workqueue_struct *ocfs2_quota_wq = NULL;
  67
  68 static void qsync_work_fn(struct work_struct *work);
  69
  70 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
  71 {
  72         struct ocfs2_global_disk_dqblk *d = dp;
  73         struct mem_dqblk *m = &dquot->dq_dqb;
  74
  75         /* Update from disk only entries not set by the admin */
  76         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
  77                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
  78                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
  79         }
  80         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
  81                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
  82         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
  83                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
  84                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
  85         }
  86         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
  87                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
  88         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
  89                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
  90         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
  91                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
  92         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
  93 }
  94
  95 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
  96 {
  97         struct ocfs2_global_disk_dqblk *d = dp;
  98         struct mem_dqblk *m = &dquot->dq_dqb;
  99
 100         d->dqb_id = cpu_to_le32(dquot->dq_id);
 101         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
 102         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
 103         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
 104         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
 105         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
 106         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
 107         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
 108         d->dqb_btime = cpu_to_le64(m->dqb_btime);
 109         d->dqb_itime = cpu_to_le64(m->dqb_itime);
 110         d->dqb_pad1 = d->dqb_pad2 = 0;
 111 }
 112
 113 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
 114 {
 115         struct ocfs2_global_disk_dqblk *d = dp;
 116         struct ocfs2_mem_dqinfo *oinfo =
 117                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 118
 119         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
 120                 return 0;
 121         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
 122 }
 123
 124 struct qtree_fmt_operations ocfs2_global_ops = {
 125         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
 126         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
 127         .is_id = ocfs2_global_is_id,
 128 };
 129
 130 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
 131 {
 132         struct ocfs2_disk_dqtrailer *dqt =
 133                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
 134
 135         mlog(0, "Validating quota block %llu\n",
 136              (unsigned long long)bh->b_blocknr);
 137
 138         BUG_ON(!buffer_uptodate(bh));
 139
 140         /*
 141          * If the ecc fails, we return the error but otherwise
 142          * leave the filesystem running.  We know any error is
 143          * local to this block.
 144          */
 145         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
 146 }
 147
 148 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
 149                                 struct buffer_head **bhp)
 150 {
 151         int rc;
 152
 153         *bhp = NULL;
 154         rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
 155                                ocfs2_validate_quota_block);
 156         if (rc)
 157                 mlog_errno(rc);
 158         return rc;
 159 }
 160
 161 /* Read data from global quotafile - avoid pagecache and such because we cannot
 162  * afford acquiring the locks... We use quota cluster lock to serialize
 163  * operations. Caller is responsible for acquiring it. */
 164 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 165                          size_t len, loff_t off)
 166 {
 167         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 168         struct inode *gqinode = oinfo->dqi_gqinode;
 169         loff_t i_size = i_size_read(gqinode);
 170         int offset = off & (sb->s_blocksize - 1);
 171         sector_t blk = off >> sb->s_blocksize_bits;
 172         int err = 0;
 173         struct buffer_head *bh;
 174         size_t toread, tocopy;
 175         u64 pblock = 0, pcount = 0;
 176
 177         if (off > i_size)
 178                 return 0;
 179         if (off + len > i_size)
 180                 len = i_size - off;
 181         toread = len;
 182         while (toread > 0) {
 183                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
 184                 if (!pcount) {
 185                         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
 186                                                           &pcount, NULL);
 187                         if (err) {
 188                                 mlog_errno(err);
 189                                 return err;
 190                         }
 191                 } else {
 192                         pcount--;
 193                         pblock++;
 194                 }
 195                 bh = NULL;
 196                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
 197                 if (err) {
 198                         mlog_errno(err);
 199                         return err;
 200                 }
 201                 memcpy(data, bh->b_data + offset, tocopy);
 202                 brelse(bh);
 203                 offset = 0;
 204                 toread -= tocopy;
 205                 data += tocopy;
 206                 blk++;
 207         }
 208         return len;
 209 }
 210
 211 /* Write to quotafile (we know the transaction is already started and has
 212  * enough credits) */
 213 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 214                           const char *data, size_t len, loff_t off)
 215 {
 216         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 217         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 218         struct inode *gqinode = oinfo->dqi_gqinode;
 219         int offset = off & (sb->s_blocksize - 1);
 220         sector_t blk = off >> sb->s_blocksize_bits;
 221         int err = 0, new = 0, ja_type;
 222         struct buffer_head *bh = NULL;
 223         handle_t *handle = journal_current_handle();
 224         u64 pblock, pcount;
 225
 226         if (!handle) {
 227                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 228                      "because transaction was not started.\n",
 229                      (unsigned long long)off, (unsigned long long)len);
 230                 return -EIO;
 231         }
 232         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 233                 WARN_ON(1);
 234                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 235         }
 236
 237         if (gqinode->i_size < off + len) {
 238                 loff_t rounded_end =
 239                                 ocfs2_align_bytes_to_blocks(sb, off + len);
 240
 241                 /* Space is already allocated in ocfs2_acquire_dquot() */
 242                 err = ocfs2_simple_size_update(gqinode,
 243                                                oinfo->dqi_gqi_bh,
 244                                                rounded_end);
 245                 if (err < 0)
 246                         goto out;
 247                 new = 1;
 248         }
 249         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
 250         if (err) {
 251                 mlog_errno(err);
 252                 goto out;
 253         }
 254         /* Not rewriting whole block? */
 255         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 256             !new) {
 257                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
 258                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
 259         } else {
 260                 bh = sb_getblk(sb, pblock);
 261                 if (!bh)
 262                         err = -ENOMEM;
 263                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
 264         }
 265         if (err) {
 266                 mlog_errno(err);
 267                 goto out;
 268         }
 269         lock_buffer(bh);
 270         if (new)
 271                 memset(bh->b_data, 0, sb->s_blocksize);
 272         memcpy(bh->b_data + offset, data, len);
 273         flush_dcache_page(bh->b_page);
 274         set_buffer_uptodate(bh);
 275         unlock_buffer(bh);
 276         ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
 277         err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
 278                                       ja_type);
 279         if (err < 0) {
 280                 brelse(bh);
 281                 goto out;
 282         }
 283         ocfs2_journal_dirty(handle, bh);
 284         brelse(bh);
 285 out:
 286         if (err) {
 287                 mlog_errno(err);
 288                 return err;
 289         }
 290         gqinode->i_version++;
 291         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 292         return len;
 293 }
 294
 295 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 296 {
 297         int status;
 298         struct buffer_head *bh = NULL;
 299
 300         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 301         if (status < 0)
 302                 return status;
 303         spin_lock(&dq_data_lock);
 304         if (!oinfo->dqi_gqi_count++)
 305                 oinfo->dqi_gqi_bh = bh;
 306         else
 307                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 308         spin_unlock(&dq_data_lock);
 309         if (ex) {
 310                 mutex_lock(&oinfo->dqi_gqinode->i_mutex);
 311                 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 312         } else {
 313                 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 314         }
 315         return 0;
 316 }
 317
 318 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 319 {
 320         if (ex) {
 321                 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 322                 mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
 323         } else {
 324                 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 325         }
 326         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 327         brelse(oinfo->dqi_gqi_bh);
 328         spin_lock(&dq_data_lock);
 329         if (!--oinfo->dqi_gqi_count)
 330                 oinfo->dqi_gqi_bh = NULL;
 331         spin_unlock(&dq_data_lock);
 332 }
 333
 334 /* Read information header from global quota file */
 335 int ocfs2_global_read_info(struct super_block *sb, int type)
 336 {
 337         struct inode *gqinode = NULL;
 338         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 339                                         GROUP_QUOTA_SYSTEM_INODE };
 340         struct ocfs2_global_disk_dqinfo dinfo;
 341         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 342         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 343         u64 pcount;
 344         int status;
 345
 346         mlog_entry_void();
 347
 348         /* Read global header */
 349         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 350                         OCFS2_INVALID_SLOT);
 351         if (!gqinode) {
 352                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 353                         type);
 354                 status = -EINVAL;
 355                 goto out_err;
 356         }
 357         oinfo->dqi_gi.dqi_sb = sb;
 358         oinfo->dqi_gi.dqi_type = type;
 359         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 360         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 361         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 362         oinfo->dqi_gqi_bh = NULL;
 363         oinfo->dqi_gqi_count = 0;
 364         oinfo->dqi_gqinode = gqinode;
 365         status = ocfs2_lock_global_qf(oinfo, 0);
 366         if (status < 0) {
 367                 mlog_errno(status);
 368                 goto out_err;
 369         }
 370
 371         status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
 372                                              &pcount, NULL);
 373         if (status < 0)
 374                 goto out_unlock;
 375
 376         status = ocfs2_qinfo_lock(oinfo, 0);
 377         if (status < 0)
 378                 goto out_unlock;
 379         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 380                                       sizeof(struct ocfs2_global_disk_dqinfo),
 381                                       OCFS2_GLOBAL_INFO_OFF);
 382         ocfs2_qinfo_unlock(oinfo, 0);
 383         ocfs2_unlock_global_qf(oinfo, 0);
 384         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 385                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 386                      status);
 387                 if (status >= 0)
 388                         status = -EIO;
 389                 mlog_errno(status);
 390                 goto out_err;
 391         }
 392         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 393         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 394         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 395         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 396         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 397         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 398         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 399         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 400                                                 OCFS2_QBLK_RESERVED_SPACE;
 401         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 402         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 403         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 404                            msecs_to_jiffies(oinfo->dqi_syncms));
 405
 406 out_err:
 407         mlog_exit(status);
 408         return status;
 409 out_unlock:
 410         ocfs2_unlock_global_qf(oinfo, 0);
 411         mlog_errno(status);
 412         goto out_err;
 413 }
 414
 415 /* Write information to global quota file. Expects exlusive lock on quota
 416  * file inode and quota info */
 417 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 418 {
 419         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 420         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 421         struct ocfs2_global_disk_dqinfo dinfo;
 422         ssize_t size;
 423
 424         spin_lock(&dq_data_lock);
 425         info->dqi_flags &= ~DQF_INFO_DIRTY;
 426         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 427         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 428         spin_unlock(&dq_data_lock);
 429         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 430         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 431         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 432         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 433         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 434                                      sizeof(struct ocfs2_global_disk_dqinfo),
 435                                      OCFS2_GLOBAL_INFO_OFF);
 436         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 437                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 438                 if (size >= 0)
 439                         size = -EIO;
 440                 return size;
 441         }
 442         return 0;
 443 }
 444
 445 int ocfs2_global_write_info(struct super_block *sb, int type)
 446 {
 447         int err;
 448         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 449
 450         err = ocfs2_qinfo_lock(info, 1);
 451         if (err < 0)
 452                 return err;
 453         err = __ocfs2_global_write_info(sb, type);
 454         ocfs2_qinfo_unlock(info, 1);
 455         return err;
 456 }
 457
 458 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
 459 {
 460         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 461
 462         /*
 463          * We may need to allocate tree blocks and a leaf block but not the
 464          * root block
 465          */
 466         return oinfo->dqi_gi.dqi_qtree_depth;
 467 }
 468
 469 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
 470 {
 471         /* We modify all the allocated blocks, tree root, info block and
 472          * the inode */
 473         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
 474                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
 475 }
 476
 477 /* Sync local information about quota modifications with global quota file.
 478  * Caller must have started the transaction and obtained exclusive lock for
 479  * global quota file inode */
 480 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 481 {
 482         int err, err2;
 483         struct super_block *sb = dquot->dq_sb;
 484         int type = dquot->dq_type;
 485         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 486         struct ocfs2_global_disk_dqblk dqblk;
 487         s64 spacechange, inodechange;
 488         time_t olditime, oldbtime;
 489
 490         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 491                                    sizeof(struct ocfs2_global_disk_dqblk),
 492                                    dquot->dq_off);
 493         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 494                 if (err >= 0) {
 495                         mlog(ML_ERROR, "Short read from global quota file "
 496                                        "(%u read)\n", err);
 497                         err = -EIO;
 498                 }
 499                 goto out;
 500         }
 501
 502         /* Update space and inode usage. Get also other information from
 503          * global quota file so that we don't overwrite any changes there.
 504          * We are */
 505         spin_lock(&dq_data_lock);
 506         spacechange = dquot->dq_dqb.dqb_curspace -
 507                                         OCFS2_DQUOT(dquot)->dq_origspace;
 508         inodechange = dquot->dq_dqb.dqb_curinodes -
 509                                         OCFS2_DQUOT(dquot)->dq_originodes;
 510         olditime = dquot->dq_dqb.dqb_itime;
 511         oldbtime = dquot->dq_dqb.dqb_btime;
 512         ocfs2_global_disk2memdqb(dquot, &dqblk);
 513         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
 514              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
 515              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
 516         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 517                 dquot->dq_dqb.dqb_curspace += spacechange;
 518         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 519                 dquot->dq_dqb.dqb_curinodes += inodechange;
 520         /* Set properly space grace time... */
 521         if (dquot->dq_dqb.dqb_bsoftlimit &&
 522             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 523                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 524                     oldbtime > 0) {
 525                         if (dquot->dq_dqb.dqb_btime > 0)
 526                                 dquot->dq_dqb.dqb_btime =
 527                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 528                         else
 529                                 dquot->dq_dqb.dqb_btime = oldbtime;
 530                 }
 531         } else {
 532                 dquot->dq_dqb.dqb_btime = 0;
 533                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 534         }
 535         /* Set properly inode grace time... */
 536         if (dquot->dq_dqb.dqb_isoftlimit &&
 537             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 538                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 539                     olditime > 0) {
 540                         if (dquot->dq_dqb.dqb_itime > 0)
 541                                 dquot->dq_dqb.dqb_itime =
 542                                         min(dquot->dq_dqb.dqb_itime, olditime);
 543                         else
 544                                 dquot->dq_dqb.dqb_itime = olditime;
 545                 }
 546         } else {
 547                 dquot->dq_dqb.dqb_itime = 0;
 548                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 549         }
 550         /* All information is properly updated, clear the flags */
 551         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 552         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 553         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 554         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 555         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 556         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 557         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 558         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 559         spin_unlock(&dq_data_lock);
 560         err = ocfs2_qinfo_lock(info, freeing);
 561         if (err < 0) {
 562                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 563                                " (type=%d, id=%u)\n", dquot->dq_type,
 564                                (unsigned)dquot->dq_id);
 565                 goto out;
 566         }
 567         if (freeing)
 568                 OCFS2_DQUOT(dquot)->dq_use_count--;
 569         err = qtree_write_dquot(&info->dqi_gi, dquot);
 570         if (err < 0)
 571                 goto out_qlock;
 572         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 573                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 574                 if (info_dirty(sb_dqinfo(sb, type))) {
 575                         err2 = __ocfs2_global_write_info(sb, type);
 576                         if (!err)
 577                                 err = err2;
 578                 }
 579         }
 580 out_qlock:
 581         ocfs2_qinfo_unlock(info, freeing);
 582 out:
 583         if (err < 0)
 584                 mlog_errno(err);
 585         return err;
 586 }
 587
 588 /*
 589  *  Functions for periodic syncing of dquots with global file
 590  */
 591 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 592 {
 593         handle_t *handle;
 594         struct super_block *sb = dquot->dq_sb;
 595         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 596         struct ocfs2_super *osb = OCFS2_SB(sb);
 597         int status = 0;
 598
 599         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 600                    dquot->dq_type, type, sb->s_id);
 601         if (type != dquot->dq_type)
 602                 goto out;
 603         status = ocfs2_lock_global_qf(oinfo, 1);
 604         if (status < 0)
 605                 goto out;
 606
 607         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 608         if (IS_ERR(handle)) {
 609                 status = PTR_ERR(handle);
 610                 mlog_errno(status);
 611                 goto out_ilock;
 612         }
 613         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 614         status = ocfs2_sync_dquot(dquot);
 615         if (status < 0)
 616                 mlog_errno(status);
 617         /* We have to write local structure as well... */
 618         status = ocfs2_local_write_dquot(dquot);
 619         if (status < 0)
 620                 mlog_errno(status);
 621         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 622         ocfs2_commit_trans(osb, handle);
 623 out_ilock:
 624         ocfs2_unlock_global_qf(oinfo, 1);
 625 out:
 626         mlog_exit(status);
 627         return status;
 628 }
 629
 630 static void qsync_work_fn(struct work_struct *work)
 631 {
 632         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 633                                                       struct ocfs2_mem_dqinfo,
 634                                                       dqi_sync_work.work);
 635         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 636
 637         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 638         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 639                            msecs_to_jiffies(oinfo->dqi_syncms));
 640 }
 641
 642 /*
 643  *  Wrappers for generic quota functions
 644  */
 645
 646 static int ocfs2_write_dquot(struct dquot *dquot)
 647 {
 648         handle_t *handle;
 649         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 650         int status = 0;
 651
 652         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 653
 654         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 655         if (IS_ERR(handle)) {
 656                 status = PTR_ERR(handle);
 657                 mlog_errno(status);
 658                 goto out;
 659         }
 660         mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
 661         status = ocfs2_local_write_dquot(dquot);
 662         mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
 663         ocfs2_commit_trans(osb, handle);
 664 out:
 665         mlog_exit(status);
 666         return status;
 667 }
 668
 669 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 670 {
 671         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 672         /*
 673          * We modify tree, leaf block, global info, local chunk header,
 674          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
 675          * accounts for inode update
 676          */
 677         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
 678                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
 679                OCFS2_QINFO_WRITE_CREDITS +
 680                OCFS2_INODE_UPDATE_CREDITS;
 681 }
 682
 683 static int ocfs2_release_dquot(struct dquot *dquot)
 684 {
 685         handle_t *handle;
 686         struct ocfs2_mem_dqinfo *oinfo =
 687                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 688         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 689         int status = 0;
 690
 691         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 692
 693         mutex_lock(&dquot->dq_lock);
 694         /* Check whether we are not racing with some other dqget() */
 695         if (atomic_read(&dquot->dq_count) > 1)
 696                 goto out;
 697         status = ocfs2_lock_global_qf(oinfo, 1);
 698         if (status < 0)
 699                 goto out;
 700         handle = ocfs2_start_trans(osb,
 701                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 702         if (IS_ERR(handle)) {
 703                 status = PTR_ERR(handle);
 704                 mlog_errno(status);
 705                 goto out_ilock;
 706         }
 707
 708         status = ocfs2_global_release_dquot(dquot);
 709         if (status < 0) {
 710                 mlog_errno(status);
 711                 goto out_trans;
 712         }
 713         status = ocfs2_local_release_dquot(handle, dquot);
 714         /*
 715          * If we fail here, we cannot do much as global structure is
 716          * already released. So just complain...
 717          */
 718         if (status < 0)
 719                 mlog_errno(status);
 720         clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 721 out_trans:
 722         ocfs2_commit_trans(osb, handle);
 723 out_ilock:
 724         ocfs2_unlock_global_qf(oinfo, 1);
 725 out:
 726         mutex_unlock(&dquot->dq_lock);
 727         mlog_exit(status);
 728         return status;
 729 }
 730
 731 /*
 732  * Read global dquot structure from disk or create it if it does
 733  * not exist. Also update use count of the global structure and
 734  * create structure in node-local quota file.
 735  */
 736 static int ocfs2_acquire_dquot(struct dquot *dquot)
 737 {
 738         int status = 0, err;
 739         int ex = 0;
 740         struct super_block *sb = dquot->dq_sb;
 741         struct ocfs2_super *osb = OCFS2_SB(sb);
 742         int type = dquot->dq_type;
 743         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 744         struct inode *gqinode = info->dqi_gqinode;
 745         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
 746         handle_t *handle;
 747
 748         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 749         mutex_lock(&dquot->dq_lock);
 750         /*
 751          * We need an exclusive lock, because we're going to update use count
 752          * and instantiate possibly new dquot structure
 753          */
 754         status = ocfs2_lock_global_qf(info, 1);
 755         if (status < 0)
 756                 goto out;
 757         if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
 758                 status = ocfs2_qinfo_lock(info, 0);
 759                 if (status < 0)
 760                         goto out_dq;
 761                 status = qtree_read_dquot(&info->dqi_gi, dquot);
 762                 ocfs2_qinfo_unlock(info, 0);
 763                 if (status < 0)
 764                         goto out_dq;
 765         }
 766         set_bit(DQ_READ_B, &dquot->dq_flags);
 767
 768         OCFS2_DQUOT(dquot)->dq_use_count++;
 769         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 770         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 771         if (!dquot->dq_off) {   /* No real quota entry? */
 772                 ex = 1;
 773                 /*
 774                  * Add blocks to quota file before we start a transaction since
 775                  * locking allocators ranks above a transaction start
 776                  */
 777                 WARN_ON(journal_current_handle());
 778                 status = ocfs2_extend_no_holes(gqinode, NULL,
 779                         gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
 780                         gqinode->i_size);
 781                 if (status < 0)
 782                         goto out_dq;
 783         }
 784
 785         handle = ocfs2_start_trans(osb,
 786                                    ocfs2_calc_global_qinit_credits(sb, type));
 787         if (IS_ERR(handle)) {
 788                 status = PTR_ERR(handle);
 789                 goto out_dq;
 790         }
 791         status = ocfs2_qinfo_lock(info, ex);
 792         if (status < 0)
 793                 goto out_trans;
 794         status = qtree_write_dquot(&info->dqi_gi, dquot);
 795         if (ex && info_dirty(sb_dqinfo(sb, type))) {
 796                 err = __ocfs2_global_write_info(sb, type);
 797                 if (!status)
 798                         status = err;
 799         }
 800         ocfs2_qinfo_unlock(info, ex);
 801 out_trans:
 802         ocfs2_commit_trans(osb, handle);
 803 out_dq:
 804         ocfs2_unlock_global_qf(info, 1);
 805         if (status < 0)
 806                 goto out;
 807
 808         status = ocfs2_create_local_dquot(dquot);
 809         if (status < 0)
 810                 goto out;
 811         set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 812 out:
 813         mutex_unlock(&dquot->dq_lock);
 814         mlog_exit(status);
 815         return status;
 816 }
 817
 818 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 819 {
 820         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 821                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 822                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 823                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 824                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 825                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 826         int sync = 0;
 827         int status;
 828         struct super_block *sb = dquot->dq_sb;
 829         int type = dquot->dq_type;
 830         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 831         handle_t *handle;
 832         struct ocfs2_super *osb = OCFS2_SB(sb);
 833
 834         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 835
 836         /* In case user set some limits, sync dquot immediately to global
 837          * quota file so that information propagates quicker */
 838         spin_lock(&dq_data_lock);
 839         if (dquot->dq_flags & mask)
 840                 sync = 1;
 841         spin_unlock(&dq_data_lock);
 842         /* This is a slight hack but we can't afford getting global quota
 843          * lock if we already have a transaction started. */
 844         if (!sync || journal_current_handle()) {
 845                 status = ocfs2_write_dquot(dquot);
 846                 goto out;
 847         }
 848         status = ocfs2_lock_global_qf(oinfo, 1);
 849         if (status < 0)
 850                 goto out;
 851         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 852         if (IS_ERR(handle)) {
 853                 status = PTR_ERR(handle);
 854                 mlog_errno(status);
 855                 goto out_ilock;
 856         }
 857         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 858         status = ocfs2_sync_dquot(dquot);
 859         if (status < 0) {
 860                 mlog_errno(status);
 861                 goto out_dlock;
 862         }
 863         /* Now write updated local dquot structure */
 864         status = ocfs2_local_write_dquot(dquot);
 865 out_dlock:
 866         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 867         ocfs2_commit_trans(osb, handle);
 868 out_ilock:
 869         ocfs2_unlock_global_qf(oinfo, 1);
 870 out:
 871         mlog_exit(status);
 872         return status;
 873 }
 874
 875 /* This should happen only after set_dqinfo(). */
 876 static int ocfs2_write_info(struct super_block *sb, int type)
 877 {
 878         handle_t *handle;
 879         int status = 0;
 880         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 881
 882         mlog_entry_void();
 883
 884         status = ocfs2_lock_global_qf(oinfo, 1);
 885         if (status < 0)
 886                 goto out;
 887         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 888         if (IS_ERR(handle)) {
 889                 status = PTR_ERR(handle);
 890                 mlog_errno(status);
 891                 goto out_ilock;
 892         }
 893         status = dquot_commit_info(sb, type);
 894         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 895 out_ilock:
 896         ocfs2_unlock_global_qf(oinfo, 1);
 897 out:
 898         mlog_exit(status);
 899         return status;
 900 }
 901
 902 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 903 {
 904         struct ocfs2_dquot *dquot =
 905                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 906
 907         if (!dquot)
 908                 return NULL;
 909         return &dquot->dq_dquot;
 910 }
 911
 912 static void ocfs2_destroy_dquot(struct dquot *dquot)
 913 {
 914         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 915 }
 916
 917 const struct dquot_operations ocfs2_quota_operations = {
 918         /* We never make dquot dirty so .write_dquot is never called */
 919         .acquire_dquot  = ocfs2_acquire_dquot,
 920         .release_dquot  = ocfs2_release_dquot,
 921         .mark_dirty     = ocfs2_mark_dquot_dirty,
 922         .write_info     = ocfs2_write_info,
 923         .alloc_dquot    = ocfs2_alloc_dquot,
 924         .destroy_dquot  = ocfs2_destroy_dquot,
 925 };
 926
 927 int ocfs2_quota_setup(void)
 928 {
 929         ocfs2_quota_wq = create_workqueue("o2quot");
 930         if (!ocfs2_quota_wq)
 931                 return -ENOMEM;
 932         return 0;
 933 }
 934
 935 void ocfs2_quota_shutdown(void)
 936 {
 937         if (ocfs2_quota_wq) {
 938                 flush_workqueue(ocfs2_quota_wq);
 939                 destroy_workqueue(ocfs2_quota_wq);
 940                 ocfs2_quota_wq = NULL;
 941         }
 942 }