git.oblomov.eu Git - linux-2.6/blob - 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/quota.h>
   7 #include <linux/quotaops.h>
   8 #include <linux/dqblk_qtree.h>
   9 #include <linux/jiffies.h>
  10 #include <linux/writeback.h>
  11 #include <linux/workqueue.h>
  12
  13 #define MLOG_MASK_PREFIX ML_QUOTA
  14 #include <cluster/masklog.h>
  15
  16 #include "ocfs2_fs.h"
  17 #include "ocfs2.h"
  18 #include "alloc.h"
  19 #include "blockcheck.h"
  20 #include "inode.h"
  21 #include "journal.h"
  22 #include "file.h"
  23 #include "sysfile.h"
  24 #include "dlmglue.h"
  25 #include "uptodate.h"
  26 #include "quota.h"
  27
  28 static struct workqueue_struct *ocfs2_quota_wq = NULL;
  29
  30 static void qsync_work_fn(struct work_struct *work);
  31
  32 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
  33 {
  34         struct ocfs2_global_disk_dqblk *d = dp;
  35         struct mem_dqblk *m = &dquot->dq_dqb;
  36
  37         /* Update from disk only entries not set by the admin */
  38         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
  39                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
  40                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
  41         }
  42         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
  43                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
  44         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
  45                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
  46                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
  47         }
  48         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
  49                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
  50         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
  51                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
  52         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
  53                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
  54         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
  55 }
  56
  57 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
  58 {
  59         struct ocfs2_global_disk_dqblk *d = dp;
  60         struct mem_dqblk *m = &dquot->dq_dqb;
  61
  62         d->dqb_id = cpu_to_le32(dquot->dq_id);
  63         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
  64         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
  65         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
  66         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
  67         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
  68         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
  69         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
  70         d->dqb_btime = cpu_to_le64(m->dqb_btime);
  71         d->dqb_itime = cpu_to_le64(m->dqb_itime);
  72 }
  73
  74 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
  75 {
  76         struct ocfs2_global_disk_dqblk *d = dp;
  77         struct ocfs2_mem_dqinfo *oinfo =
  78                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
  79
  80         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
  81                 return 0;
  82         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
  83 }
  84
  85 struct qtree_fmt_operations ocfs2_global_ops = {
  86         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
  87         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
  88         .is_id = ocfs2_global_is_id,
  89 };
  90
  91 static int ocfs2_validate_quota_block(struct super_block *sb,
  92                                       struct buffer_head *bh)
  93 {
  94         struct ocfs2_disk_dqtrailer *dqt =
  95                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
  96
  97         mlog(0, "Validating quota block %llu\n",
  98              (unsigned long long)bh->b_blocknr);
  99
 100         BUG_ON(!buffer_uptodate(bh));
 101
 102         /*
 103          * If the ecc fails, we return the error but otherwise
 104          * leave the filesystem running.  We know any error is
 105          * local to this block.
 106          */
 107         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
 108 }
 109
 110 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
 111                            struct buffer_head **bh)
 112 {
 113         int rc = 0;
 114         struct buffer_head *tmp = *bh;
 115
 116         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
 117                                     ocfs2_validate_quota_block);
 118         if (rc)
 119                 mlog_errno(rc);
 120
 121         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
 122         if (!rc && !*bh)
 123                 *bh = tmp;
 124
 125         return rc;
 126 }
 127
 128 static int ocfs2_get_quota_block(struct inode *inode, int block,
 129                                  struct buffer_head **bh)
 130 {
 131         u64 pblock, pcount;
 132         int err;
 133
 134         down_read(&OCFS2_I(inode)->ip_alloc_sem);
 135         err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
 136         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 137         if (err) {
 138                 mlog_errno(err);
 139                 return err;
 140         }
 141         *bh = sb_getblk(inode->i_sb, pblock);
 142         if (!*bh) {
 143                 err = -EIO;
 144                 mlog_errno(err);
 145         }
 146         return err;;
 147 }
 148
 149 /* Read data from global quotafile - avoid pagecache and such because we cannot
 150  * afford acquiring the locks... We use quota cluster lock to serialize
 151  * operations. Caller is responsible for acquiring it. */
 152 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 153                          size_t len, loff_t off)
 154 {
 155         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 156         struct inode *gqinode = oinfo->dqi_gqinode;
 157         loff_t i_size = i_size_read(gqinode);
 158         int offset = off & (sb->s_blocksize - 1);
 159         sector_t blk = off >> sb->s_blocksize_bits;
 160         int err = 0;
 161         struct buffer_head *bh;
 162         size_t toread, tocopy;
 163
 164         if (off > i_size)
 165                 return 0;
 166         if (off + len > i_size)
 167                 len = i_size - off;
 168         toread = len;
 169         while (toread > 0) {
 170                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
 171                 bh = NULL;
 172                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 173                 if (err) {
 174                         mlog_errno(err);
 175                         return err;
 176                 }
 177                 memcpy(data, bh->b_data + offset, tocopy);
 178                 brelse(bh);
 179                 offset = 0;
 180                 toread -= tocopy;
 181                 data += tocopy;
 182                 blk++;
 183         }
 184         return len;
 185 }
 186
 187 /* Write to quotafile (we know the transaction is already started and has
 188  * enough credits) */
 189 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 190                           const char *data, size_t len, loff_t off)
 191 {
 192         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 193         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 194         struct inode *gqinode = oinfo->dqi_gqinode;
 195         int offset = off & (sb->s_blocksize - 1);
 196         sector_t blk = off >> sb->s_blocksize_bits;
 197         int err = 0, new = 0, ja_type;
 198         struct buffer_head *bh = NULL;
 199         handle_t *handle = journal_current_handle();
 200
 201         if (!handle) {
 202                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 203                      "because transaction was not started.\n",
 204                      (unsigned long long)off, (unsigned long long)len);
 205                 return -EIO;
 206         }
 207         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 208                 WARN_ON(1);
 209                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 210         }
 211
 212         mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
 213         if (gqinode->i_size < off + len) {
 214                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 215                 err = ocfs2_extend_no_holes(gqinode, off + len, off);
 216                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 217                 if (err < 0)
 218                         goto out;
 219                 err = ocfs2_simple_size_update(gqinode,
 220                                                oinfo->dqi_gqi_bh,
 221                                                off + len);
 222                 if (err < 0)
 223                         goto out;
 224                 new = 1;
 225         }
 226         /* Not rewriting whole block? */
 227         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 228             !new) {
 229                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 230                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
 231         } else {
 232                 err = ocfs2_get_quota_block(gqinode, blk, &bh);
 233                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
 234         }
 235         if (err) {
 236                 mlog_errno(err);
 237                 return err;
 238         }
 239         lock_buffer(bh);
 240         if (new)
 241                 memset(bh->b_data, 0, sb->s_blocksize);
 242         memcpy(bh->b_data + offset, data, len);
 243         flush_dcache_page(bh->b_page);
 244         set_buffer_uptodate(bh);
 245         unlock_buffer(bh);
 246         ocfs2_set_buffer_uptodate(gqinode, bh);
 247         err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
 248         if (err < 0) {
 249                 brelse(bh);
 250                 goto out;
 251         }
 252         err = ocfs2_journal_dirty(handle, bh);
 253         brelse(bh);
 254         if (err < 0)
 255                 goto out;
 256 out:
 257         if (err) {
 258                 mutex_unlock(&gqinode->i_mutex);
 259                 mlog_errno(err);
 260                 return err;
 261         }
 262         gqinode->i_version++;
 263         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 264         mutex_unlock(&gqinode->i_mutex);
 265         return len;
 266 }
 267
 268 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 269 {
 270         int status;
 271         struct buffer_head *bh = NULL;
 272
 273         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 274         if (status < 0)
 275                 return status;
 276         spin_lock(&dq_data_lock);
 277         if (!oinfo->dqi_gqi_count++)
 278                 oinfo->dqi_gqi_bh = bh;
 279         else
 280                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 281         spin_unlock(&dq_data_lock);
 282         return 0;
 283 }
 284
 285 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 286 {
 287         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 288         brelse(oinfo->dqi_gqi_bh);
 289         spin_lock(&dq_data_lock);
 290         if (!--oinfo->dqi_gqi_count)
 291                 oinfo->dqi_gqi_bh = NULL;
 292         spin_unlock(&dq_data_lock);
 293 }
 294
 295 /* Read information header from global quota file */
 296 int ocfs2_global_read_info(struct super_block *sb, int type)
 297 {
 298         struct inode *gqinode = NULL;
 299         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 300                                         GROUP_QUOTA_SYSTEM_INODE };
 301         struct ocfs2_global_disk_dqinfo dinfo;
 302         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 303         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 304         int status;
 305
 306         mlog_entry_void();
 307
 308         /* Read global header */
 309         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 310                         OCFS2_INVALID_SLOT);
 311         if (!gqinode) {
 312                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 313                         type);
 314                 status = -EINVAL;
 315                 goto out_err;
 316         }
 317         oinfo->dqi_gi.dqi_sb = sb;
 318         oinfo->dqi_gi.dqi_type = type;
 319         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 320         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 321         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 322         oinfo->dqi_gqi_bh = NULL;
 323         oinfo->dqi_gqi_count = 0;
 324         oinfo->dqi_gqinode = gqinode;
 325         status = ocfs2_lock_global_qf(oinfo, 0);
 326         if (status < 0) {
 327                 mlog_errno(status);
 328                 goto out_err;
 329         }
 330         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 331                                       sizeof(struct ocfs2_global_disk_dqinfo),
 332                                       OCFS2_GLOBAL_INFO_OFF);
 333         ocfs2_unlock_global_qf(oinfo, 0);
 334         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 335                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 336                      status);
 337                 if (status >= 0)
 338                         status = -EIO;
 339                 mlog_errno(status);
 340                 goto out_err;
 341         }
 342         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 343         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 344         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 345         oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
 346         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 347         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 348         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 349         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 350         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 351                                                 OCFS2_QBLK_RESERVED_SPACE;
 352         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 353         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 354         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 355                            oinfo->dqi_syncjiff);
 356
 357 out_err:
 358         mlog_exit(status);
 359         return status;
 360 }
 361
 362 /* Write information to global quota file. Expects exlusive lock on quota
 363  * file inode and quota info */
 364 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 365 {
 366         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 367         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 368         struct ocfs2_global_disk_dqinfo dinfo;
 369         ssize_t size;
 370
 371         spin_lock(&dq_data_lock);
 372         info->dqi_flags &= ~DQF_INFO_DIRTY;
 373         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 374         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 375         spin_unlock(&dq_data_lock);
 376         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 377         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 378         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 379         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 380         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 381                                      sizeof(struct ocfs2_global_disk_dqinfo),
 382                                      OCFS2_GLOBAL_INFO_OFF);
 383         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 384                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 385                 if (size >= 0)
 386                         size = -EIO;
 387                 return size;
 388         }
 389         return 0;
 390 }
 391
 392 int ocfs2_global_write_info(struct super_block *sb, int type)
 393 {
 394         int err;
 395         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 396
 397         err = ocfs2_qinfo_lock(info, 1);
 398         if (err < 0)
 399                 return err;
 400         err = __ocfs2_global_write_info(sb, type);
 401         ocfs2_qinfo_unlock(info, 1);
 402         return err;
 403 }
 404
 405 /* Read in information from global quota file and acquire a reference to it.
 406  * dquot_acquire() has already started the transaction and locked quota file */
 407 int ocfs2_global_read_dquot(struct dquot *dquot)
 408 {
 409         int err, err2, ex = 0;
 410         struct ocfs2_mem_dqinfo *info =
 411                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 412
 413         err = ocfs2_qinfo_lock(info, 0);
 414         if (err < 0)
 415                 goto out;
 416         err = qtree_read_dquot(&info->dqi_gi, dquot);
 417         if (err < 0)
 418                 goto out_qlock;
 419         OCFS2_DQUOT(dquot)->dq_use_count++;
 420         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 421         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 422         if (!dquot->dq_off) {   /* No real quota entry? */
 423                 /* Upgrade to exclusive lock for allocation */
 424                 err = ocfs2_qinfo_lock(info, 1);
 425                 if (err < 0)
 426                         goto out_qlock;
 427                 ex = 1;
 428         }
 429         err = qtree_write_dquot(&info->dqi_gi, dquot);
 430         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
 431                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
 432                 if (!err)
 433                         err = err2;
 434         }
 435 out_qlock:
 436         if (ex)
 437                 ocfs2_qinfo_unlock(info, 1);
 438         ocfs2_qinfo_unlock(info, 0);
 439 out:
 440         if (err < 0)
 441                 mlog_errno(err);
 442         return err;
 443 }
 444
 445 /* Sync local information about quota modifications with global quota file.
 446  * Caller must have started the transaction and obtained exclusive lock for
 447  * global quota file inode */
 448 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 449 {
 450         int err, err2;
 451         struct super_block *sb = dquot->dq_sb;
 452         int type = dquot->dq_type;
 453         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 454         struct ocfs2_global_disk_dqblk dqblk;
 455         s64 spacechange, inodechange;
 456         time_t olditime, oldbtime;
 457
 458         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 459                                    sizeof(struct ocfs2_global_disk_dqblk),
 460                                    dquot->dq_off);
 461         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 462                 if (err >= 0) {
 463                         mlog(ML_ERROR, "Short read from global quota file "
 464                                        "(%u read)\n", err);
 465                         err = -EIO;
 466                 }
 467                 goto out;
 468         }
 469
 470         /* Update space and inode usage. Get also other information from
 471          * global quota file so that we don't overwrite any changes there.
 472          * We are */
 473         spin_lock(&dq_data_lock);
 474         spacechange = dquot->dq_dqb.dqb_curspace -
 475                                         OCFS2_DQUOT(dquot)->dq_origspace;
 476         inodechange = dquot->dq_dqb.dqb_curinodes -
 477                                         OCFS2_DQUOT(dquot)->dq_originodes;
 478         olditime = dquot->dq_dqb.dqb_itime;
 479         oldbtime = dquot->dq_dqb.dqb_btime;
 480         ocfs2_global_disk2memdqb(dquot, &dqblk);
 481         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
 482              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
 483              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
 484         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 485                 dquot->dq_dqb.dqb_curspace += spacechange;
 486         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 487                 dquot->dq_dqb.dqb_curinodes += inodechange;
 488         /* Set properly space grace time... */
 489         if (dquot->dq_dqb.dqb_bsoftlimit &&
 490             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 491                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 492                     oldbtime > 0) {
 493                         if (dquot->dq_dqb.dqb_btime > 0)
 494                                 dquot->dq_dqb.dqb_btime =
 495                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 496                         else
 497                                 dquot->dq_dqb.dqb_btime = oldbtime;
 498                 }
 499         } else {
 500                 dquot->dq_dqb.dqb_btime = 0;
 501                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 502         }
 503         /* Set properly inode grace time... */
 504         if (dquot->dq_dqb.dqb_isoftlimit &&
 505             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 506                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 507                     olditime > 0) {
 508                         if (dquot->dq_dqb.dqb_itime > 0)
 509                                 dquot->dq_dqb.dqb_itime =
 510                                         min(dquot->dq_dqb.dqb_itime, olditime);
 511                         else
 512                                 dquot->dq_dqb.dqb_itime = olditime;
 513                 }
 514         } else {
 515                 dquot->dq_dqb.dqb_itime = 0;
 516                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 517         }
 518         /* All information is properly updated, clear the flags */
 519         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 520         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 521         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 522         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 523         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 524         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 525         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 526         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 527         spin_unlock(&dq_data_lock);
 528         err = ocfs2_qinfo_lock(info, freeing);
 529         if (err < 0) {
 530                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 531                                " (type=%d, id=%u)\n", dquot->dq_type,
 532                                (unsigned)dquot->dq_id);
 533                 goto out;
 534         }
 535         if (freeing)
 536                 OCFS2_DQUOT(dquot)->dq_use_count--;
 537         err = qtree_write_dquot(&info->dqi_gi, dquot);
 538         if (err < 0)
 539                 goto out_qlock;
 540         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 541                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 542                 if (info_dirty(sb_dqinfo(sb, type))) {
 543                         err2 = __ocfs2_global_write_info(sb, type);
 544                         if (!err)
 545                                 err = err2;
 546                 }
 547         }
 548 out_qlock:
 549         ocfs2_qinfo_unlock(info, freeing);
 550 out:
 551         if (err < 0)
 552                 mlog_errno(err);
 553         return err;
 554 }
 555
 556 /*
 557  *  Functions for periodic syncing of dquots with global file
 558  */
 559 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 560 {
 561         handle_t *handle;
 562         struct super_block *sb = dquot->dq_sb;
 563         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 564         struct ocfs2_super *osb = OCFS2_SB(sb);
 565         int status = 0;
 566
 567         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 568                    dquot->dq_type, type, sb->s_id);
 569         if (type != dquot->dq_type)
 570                 goto out;
 571         status = ocfs2_lock_global_qf(oinfo, 1);
 572         if (status < 0)
 573                 goto out;
 574
 575         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 576         if (IS_ERR(handle)) {
 577                 status = PTR_ERR(handle);
 578                 mlog_errno(status);
 579                 goto out_ilock;
 580         }
 581         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 582         status = ocfs2_sync_dquot(dquot);
 583         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 584         if (status < 0)
 585                 mlog_errno(status);
 586         /* We have to write local structure as well... */
 587         dquot_mark_dquot_dirty(dquot);
 588         status = dquot_commit(dquot);
 589         if (status < 0)
 590                 mlog_errno(status);
 591         ocfs2_commit_trans(osb, handle);
 592 out_ilock:
 593         ocfs2_unlock_global_qf(oinfo, 1);
 594 out:
 595         mlog_exit(status);
 596         return status;
 597 }
 598
 599 static void qsync_work_fn(struct work_struct *work)
 600 {
 601         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 602                                                       struct ocfs2_mem_dqinfo,
 603                                                       dqi_sync_work.work);
 604         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 605
 606         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 607         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 608                            oinfo->dqi_syncjiff);
 609 }
 610
 611 /*
 612  *  Wrappers for generic quota functions
 613  */
 614
 615 static int ocfs2_write_dquot(struct dquot *dquot)
 616 {
 617         handle_t *handle;
 618         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 619         int status = 0;
 620
 621         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 622
 623         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 624         if (IS_ERR(handle)) {
 625                 status = PTR_ERR(handle);
 626                 mlog_errno(status);
 627                 goto out;
 628         }
 629         status = dquot_commit(dquot);
 630         ocfs2_commit_trans(osb, handle);
 631 out:
 632         mlog_exit(status);
 633         return status;
 634 }
 635
 636 int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 637 {
 638         struct ocfs2_mem_dqinfo *oinfo;
 639         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 640                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
 641
 642         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
 643                 return 0;
 644
 645         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 646         /* We modify tree, leaf block, global info, local chunk header,
 647          * global and local inode */
 648         return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
 649                2 * OCFS2_INODE_UPDATE_CREDITS;
 650 }
 651
 652 static int ocfs2_release_dquot(struct dquot *dquot)
 653 {
 654         handle_t *handle;
 655         struct ocfs2_mem_dqinfo *oinfo =
 656                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 657         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 658         int status = 0;
 659
 660         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 661
 662         status = ocfs2_lock_global_qf(oinfo, 1);
 663         if (status < 0)
 664                 goto out;
 665         handle = ocfs2_start_trans(osb,
 666                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 667         if (IS_ERR(handle)) {
 668                 status = PTR_ERR(handle);
 669                 mlog_errno(status);
 670                 goto out_ilock;
 671         }
 672         status = dquot_release(dquot);
 673         ocfs2_commit_trans(osb, handle);
 674 out_ilock:
 675         ocfs2_unlock_global_qf(oinfo, 1);
 676 out:
 677         mlog_exit(status);
 678         return status;
 679 }
 680
 681 int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
 682 {
 683         struct ocfs2_mem_dqinfo *oinfo;
 684         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 685                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
 686         struct ocfs2_dinode *lfe, *gfe;
 687
 688         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
 689                 return 0;
 690
 691         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 692         gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
 693         lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
 694         /* We can extend local file + global file. In local file we
 695          * can modify info, chunk header block and dquot block. In
 696          * global file we can modify info, tree and leaf block */
 697         return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
 698                ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
 699                3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
 700 }
 701
 702 static int ocfs2_acquire_dquot(struct dquot *dquot)
 703 {
 704         handle_t *handle;
 705         struct ocfs2_mem_dqinfo *oinfo =
 706                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 707         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 708         int status = 0;
 709
 710         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 711         /* We need an exclusive lock, because we're going to update use count
 712          * and instantiate possibly new dquot structure */
 713         status = ocfs2_lock_global_qf(oinfo, 1);
 714         if (status < 0)
 715                 goto out;
 716         handle = ocfs2_start_trans(osb,
 717                 ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
 718         if (IS_ERR(handle)) {
 719                 status = PTR_ERR(handle);
 720                 mlog_errno(status);
 721                 goto out_ilock;
 722         }
 723         status = dquot_acquire(dquot);
 724         ocfs2_commit_trans(osb, handle);
 725 out_ilock:
 726         ocfs2_unlock_global_qf(oinfo, 1);
 727 out:
 728         mlog_exit(status);
 729         return status;
 730 }
 731
 732 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 733 {
 734         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 735                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 736                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 737                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 738                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 739                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 740         int sync = 0;
 741         int status;
 742         struct super_block *sb = dquot->dq_sb;
 743         int type = dquot->dq_type;
 744         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 745         handle_t *handle;
 746         struct ocfs2_super *osb = OCFS2_SB(sb);
 747
 748         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 749         dquot_mark_dquot_dirty(dquot);
 750
 751         /* In case user set some limits, sync dquot immediately to global
 752          * quota file so that information propagates quicker */
 753         spin_lock(&dq_data_lock);
 754         if (dquot->dq_flags & mask)
 755                 sync = 1;
 756         spin_unlock(&dq_data_lock);
 757         if (!sync) {
 758                 status = ocfs2_write_dquot(dquot);
 759                 goto out;
 760         }
 761         status = ocfs2_lock_global_qf(oinfo, 1);
 762         if (status < 0)
 763                 goto out;
 764         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 765         if (IS_ERR(handle)) {
 766                 status = PTR_ERR(handle);
 767                 mlog_errno(status);
 768                 goto out_ilock;
 769         }
 770         status = ocfs2_sync_dquot(dquot);
 771         if (status < 0) {
 772                 mlog_errno(status);
 773                 goto out_trans;
 774         }
 775         /* Now write updated local dquot structure */
 776         status = dquot_commit(dquot);
 777 out_trans:
 778         ocfs2_commit_trans(osb, handle);
 779 out_ilock:
 780         ocfs2_unlock_global_qf(oinfo, 1);
 781 out:
 782         mlog_exit(status);
 783         return status;
 784 }
 785
 786 /* This should happen only after set_dqinfo(). */
 787 static int ocfs2_write_info(struct super_block *sb, int type)
 788 {
 789         handle_t *handle;
 790         int status = 0;
 791         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 792
 793         mlog_entry_void();
 794
 795         status = ocfs2_lock_global_qf(oinfo, 1);
 796         if (status < 0)
 797                 goto out;
 798         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 799         if (IS_ERR(handle)) {
 800                 status = PTR_ERR(handle);
 801                 mlog_errno(status);
 802                 goto out_ilock;
 803         }
 804         status = dquot_commit_info(sb, type);
 805         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 806 out_ilock:
 807         ocfs2_unlock_global_qf(oinfo, 1);
 808 out:
 809         mlog_exit(status);
 810         return status;
 811 }
 812
 813 /* This is difficult. We have to lock quota inode and start transaction
 814  * in this function but we don't want to take the penalty of exlusive
 815  * quota file lock when we are just going to use cached structures. So
 816  * we just take read lock check whether we have dquot cached and if so,
 817  * we don't have to take the write lock... */
 818 static int ocfs2_dquot_initialize(struct inode *inode, int type)
 819 {
 820         handle_t *handle = NULL;
 821         int status = 0;
 822         struct super_block *sb = inode->i_sb;
 823         struct ocfs2_mem_dqinfo *oinfo;
 824         int exclusive = 0;
 825         int cnt;
 826         qid_t id;
 827
 828         mlog_entry_void();
 829
 830         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 831                 if (type != -1 && cnt != type)
 832                         continue;
 833                 if (!sb_has_quota_active(sb, cnt))
 834                         continue;
 835                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 836                 status = ocfs2_lock_global_qf(oinfo, 0);
 837                 if (status < 0)
 838                         goto out;
 839                 /* This is just a performance optimization not a reliable test.
 840                  * Since we hold an inode lock, noone can actually release
 841                  * the structure until we are finished with initialization. */
 842                 if (inode->i_dquot[cnt] != NODQUOT) {
 843                         ocfs2_unlock_global_qf(oinfo, 0);
 844                         continue;
 845                 }
 846                 /* When we have inode lock, we know that no dquot_release() can
 847                  * run and thus we can safely check whether we need to
 848                  * read+modify global file to get quota information or whether
 849                  * our node already has it. */
 850                 if (cnt == USRQUOTA)
 851                         id = inode->i_uid;
 852                 else if (cnt == GRPQUOTA)
 853                         id = inode->i_gid;
 854                 else
 855                         BUG();
 856                 /* Obtain exclusion from quota off... */
 857                 down_write(&sb_dqopt(sb)->dqptr_sem);
 858                 exclusive = !dquot_is_cached(sb, id, cnt);
 859                 up_write(&sb_dqopt(sb)->dqptr_sem);
 860                 if (exclusive) {
 861                         status = ocfs2_lock_global_qf(oinfo, 1);
 862                         if (status < 0) {
 863                                 exclusive = 0;
 864                                 mlog_errno(status);
 865                                 goto out_ilock;
 866                         }
 867                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 868                                         ocfs2_calc_qinit_credits(sb, cnt));
 869                         if (IS_ERR(handle)) {
 870                                 status = PTR_ERR(handle);
 871                                 mlog_errno(status);
 872                                 goto out_ilock;
 873                         }
 874                 }
 875                 dquot_initialize(inode, cnt);
 876                 if (exclusive) {
 877                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 878                         ocfs2_unlock_global_qf(oinfo, 1);
 879                 }
 880                 ocfs2_unlock_global_qf(oinfo, 0);
 881         }
 882         mlog_exit(0);
 883         return 0;
 884 out_ilock:
 885         if (exclusive)
 886                 ocfs2_unlock_global_qf(oinfo, 1);
 887         ocfs2_unlock_global_qf(oinfo, 0);
 888 out:
 889         mlog_exit(status);
 890         return status;
 891 }
 892
 893 static int ocfs2_dquot_drop_slow(struct inode *inode)
 894 {
 895         int status = 0;
 896         int cnt;
 897         int got_lock[MAXQUOTAS] = {0, 0};
 898         handle_t *handle;
 899         struct super_block *sb = inode->i_sb;
 900         struct ocfs2_mem_dqinfo *oinfo;
 901
 902         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 903                 if (!sb_has_quota_active(sb, cnt))
 904                         continue;
 905                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 906                 status = ocfs2_lock_global_qf(oinfo, 1);
 907                 if (status < 0)
 908                         goto out;
 909                 got_lock[cnt] = 1;
 910         }
 911         handle = ocfs2_start_trans(OCFS2_SB(sb),
 912                         ocfs2_calc_qinit_credits(sb, USRQUOTA) +
 913                         ocfs2_calc_qinit_credits(sb, GRPQUOTA));
 914         if (IS_ERR(handle)) {
 915                 status = PTR_ERR(handle);
 916                 mlog_errno(status);
 917                 goto out;
 918         }
 919         dquot_drop(inode);
 920         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 921 out:
 922         for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 923                 if (got_lock[cnt]) {
 924                         oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 925                         ocfs2_unlock_global_qf(oinfo, 1);
 926                 }
 927         return status;
 928 }
 929
 930 /* See the comment before ocfs2_dquot_initialize. */
 931 static int ocfs2_dquot_drop(struct inode *inode)
 932 {
 933         int status = 0;
 934         struct super_block *sb = inode->i_sb;
 935         struct ocfs2_mem_dqinfo *oinfo;
 936         int exclusive = 0;
 937         int cnt;
 938         int got_lock[MAXQUOTAS] = {0, 0};
 939
 940         mlog_entry_void();
 941         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 942                 if (!sb_has_quota_active(sb, cnt))
 943                         continue;
 944                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 945                 status = ocfs2_lock_global_qf(oinfo, 0);
 946                 if (status < 0)
 947                         goto out;
 948                 got_lock[cnt] = 1;
 949         }
 950         /* Lock against anyone releasing references so that when when we check
 951          * we know we are not going to be last ones to release dquot */
 952         down_write(&sb_dqopt(sb)->dqptr_sem);
 953         /* Urgh, this is a terrible hack :( */
 954         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 955                 if (inode->i_dquot[cnt] != NODQUOT &&
 956                     atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
 957                         exclusive = 1;
 958                         break;
 959                 }
 960         }
 961         if (!exclusive)
 962                 dquot_drop_locked(inode);
 963         up_write(&sb_dqopt(sb)->dqptr_sem);
 964 out:
 965         for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 966                 if (got_lock[cnt]) {
 967                         oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 968                         ocfs2_unlock_global_qf(oinfo, 0);
 969                 }
 970         /* In case we bailed out because we had to do expensive locking
 971          * do it now... */
 972         if (exclusive)
 973                 status = ocfs2_dquot_drop_slow(inode);
 974         mlog_exit(status);
 975         return status;
 976 }
 977
 978 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 979 {
 980         struct ocfs2_dquot *dquot =
 981                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 982
 983         if (!dquot)
 984                 return NULL;
 985         return &dquot->dq_dquot;
 986 }
 987
 988 static void ocfs2_destroy_dquot(struct dquot *dquot)
 989 {
 990         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 991 }
 992
 993 struct dquot_operations ocfs2_quota_operations = {
 994         .initialize     = ocfs2_dquot_initialize,
 995         .drop           = ocfs2_dquot_drop,
 996         .alloc_space    = dquot_alloc_space,
 997         .alloc_inode    = dquot_alloc_inode,
 998         .free_space     = dquot_free_space,
 999         .free_inode     = dquot_free_inode,
1000         .transfer       = dquot_transfer,
1001         .write_dquot    = ocfs2_write_dquot,
1002         .acquire_dquot  = ocfs2_acquire_dquot,
1003         .release_dquot  = ocfs2_release_dquot,
1004         .mark_dirty     = ocfs2_mark_dquot_dirty,
1005         .write_info     = ocfs2_write_info,
1006         .alloc_dquot    = ocfs2_alloc_dquot,
1007         .destroy_dquot  = ocfs2_destroy_dquot,
1008 };
1009
1010 int ocfs2_quota_setup(void)
1011 {
1012         ocfs2_quota_wq = create_workqueue("o2quot");
1013         if (!ocfs2_quota_wq)
1014                 return -ENOMEM;
1015         return 0;
1016 }
1017
1018 void ocfs2_quota_shutdown(void)
1019 {
1020         if (ocfs2_quota_wq) {
1021                 flush_workqueue(ocfs2_quota_wq);
1022                 destroy_workqueue(ocfs2_quota_wq);
1023                 ocfs2_quota_wq = NULL;
1024         }
1025 }