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 "super.h"
  27 #include "quota.h"
  28
  29 static struct workqueue_struct *ocfs2_quota_wq = NULL;
  30
  31 static void qsync_work_fn(struct work_struct *work);
  32
  33 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
  34 {
  35         struct ocfs2_global_disk_dqblk *d = dp;
  36         struct mem_dqblk *m = &dquot->dq_dqb;
  37
  38         /* Update from disk only entries not set by the admin */
  39         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
  40                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
  41                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
  42         }
  43         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
  44                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
  45         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
  46                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
  47                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
  48         }
  49         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
  50                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
  51         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
  52                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
  53         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
  54                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
  55         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
  56 }
  57
  58 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
  59 {
  60         struct ocfs2_global_disk_dqblk *d = dp;
  61         struct mem_dqblk *m = &dquot->dq_dqb;
  62
  63         d->dqb_id = cpu_to_le32(dquot->dq_id);
  64         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
  65         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
  66         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
  67         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
  68         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
  69         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
  70         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
  71         d->dqb_btime = cpu_to_le64(m->dqb_btime);
  72         d->dqb_itime = cpu_to_le64(m->dqb_itime);
  73         d->dqb_pad1 = d->dqb_pad2 = 0;
  74 }
  75
  76 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
  77 {
  78         struct ocfs2_global_disk_dqblk *d = dp;
  79         struct ocfs2_mem_dqinfo *oinfo =
  80                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
  81
  82         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
  83                 return 0;
  84         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
  85 }
  86
  87 struct qtree_fmt_operations ocfs2_global_ops = {
  88         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
  89         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
  90         .is_id = ocfs2_global_is_id,
  91 };
  92
  93 static int ocfs2_validate_quota_block(struct super_block *sb,
  94                                       struct buffer_head *bh)
  95 {
  96         struct ocfs2_disk_dqtrailer *dqt =
  97                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
  98
  99         mlog(0, "Validating quota block %llu\n",
 100              (unsigned long long)bh->b_blocknr);
 101
 102         BUG_ON(!buffer_uptodate(bh));
 103
 104         /*
 105          * If the ecc fails, we return the error but otherwise
 106          * leave the filesystem running.  We know any error is
 107          * local to this block.
 108          */
 109         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
 110 }
 111
 112 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
 113                            struct buffer_head **bh)
 114 {
 115         int rc = 0;
 116         struct buffer_head *tmp = *bh;
 117
 118         if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
 119                 ocfs2_error(inode->i_sb,
 120                             "Quota file %llu is probably corrupted! Requested "
 121                             "to read block %Lu but file has size only %Lu\n",
 122                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
 123                             (unsigned long long)v_block,
 124                             (unsigned long long)i_size_read(inode));
 125                 return -EIO;
 126         }
 127         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
 128                                     ocfs2_validate_quota_block);
 129         if (rc)
 130                 mlog_errno(rc);
 131
 132         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
 133         if (!rc && !*bh)
 134                 *bh = tmp;
 135
 136         return rc;
 137 }
 138
 139 static int ocfs2_get_quota_block(struct inode *inode, int block,
 140                                  struct buffer_head **bh)
 141 {
 142         u64 pblock, pcount;
 143         int err;
 144
 145         down_read(&OCFS2_I(inode)->ip_alloc_sem);
 146         err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
 147         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 148         if (err) {
 149                 mlog_errno(err);
 150                 return err;
 151         }
 152         *bh = sb_getblk(inode->i_sb, pblock);
 153         if (!*bh) {
 154                 err = -EIO;
 155                 mlog_errno(err);
 156         }
 157         return err;;
 158 }
 159
 160 /* Read data from global quotafile - avoid pagecache and such because we cannot
 161  * afford acquiring the locks... We use quota cluster lock to serialize
 162  * operations. Caller is responsible for acquiring it. */
 163 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 164                          size_t len, loff_t off)
 165 {
 166         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 167         struct inode *gqinode = oinfo->dqi_gqinode;
 168         loff_t i_size = i_size_read(gqinode);
 169         int offset = off & (sb->s_blocksize - 1);
 170         sector_t blk = off >> sb->s_blocksize_bits;
 171         int err = 0;
 172         struct buffer_head *bh;
 173         size_t toread, tocopy;
 174
 175         if (off > i_size)
 176                 return 0;
 177         if (off + len > i_size)
 178                 len = i_size - off;
 179         toread = len;
 180         while (toread > 0) {
 181                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
 182                 bh = NULL;
 183                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 184                 if (err) {
 185                         mlog_errno(err);
 186                         return err;
 187                 }
 188                 memcpy(data, bh->b_data + offset, tocopy);
 189                 brelse(bh);
 190                 offset = 0;
 191                 toread -= tocopy;
 192                 data += tocopy;
 193                 blk++;
 194         }
 195         return len;
 196 }
 197
 198 /* Write to quotafile (we know the transaction is already started and has
 199  * enough credits) */
 200 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 201                           const char *data, size_t len, loff_t off)
 202 {
 203         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 204         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 205         struct inode *gqinode = oinfo->dqi_gqinode;
 206         int offset = off & (sb->s_blocksize - 1);
 207         sector_t blk = off >> sb->s_blocksize_bits;
 208         int err = 0, new = 0, ja_type;
 209         struct buffer_head *bh = NULL;
 210         handle_t *handle = journal_current_handle();
 211
 212         if (!handle) {
 213                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 214                      "because transaction was not started.\n",
 215                      (unsigned long long)off, (unsigned long long)len);
 216                 return -EIO;
 217         }
 218         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 219                 WARN_ON(1);
 220                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 221         }
 222
 223         mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
 224         if (gqinode->i_size < off + len) {
 225                 loff_t rounded_end =
 226                                 ocfs2_align_bytes_to_blocks(sb, off + len);
 227
 228                 /* Space is already allocated in ocfs2_global_read_dquot() */
 229                 err = ocfs2_simple_size_update(gqinode,
 230                                                oinfo->dqi_gqi_bh,
 231                                                rounded_end);
 232                 if (err < 0)
 233                         goto out;
 234                 new = 1;
 235         }
 236         /* Not rewriting whole block? */
 237         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 238             !new) {
 239                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 240                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
 241         } else {
 242                 err = ocfs2_get_quota_block(gqinode, blk, &bh);
 243                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
 244         }
 245         if (err) {
 246                 mlog_errno(err);
 247                 goto out;
 248         }
 249         lock_buffer(bh);
 250         if (new)
 251                 memset(bh->b_data, 0, sb->s_blocksize);
 252         memcpy(bh->b_data + offset, data, len);
 253         flush_dcache_page(bh->b_page);
 254         set_buffer_uptodate(bh);
 255         unlock_buffer(bh);
 256         ocfs2_set_buffer_uptodate(gqinode, bh);
 257         err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
 258         if (err < 0) {
 259                 brelse(bh);
 260                 goto out;
 261         }
 262         err = ocfs2_journal_dirty(handle, bh);
 263         brelse(bh);
 264         if (err < 0)
 265                 goto out;
 266 out:
 267         if (err) {
 268                 mutex_unlock(&gqinode->i_mutex);
 269                 mlog_errno(err);
 270                 return err;
 271         }
 272         gqinode->i_version++;
 273         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 274         mutex_unlock(&gqinode->i_mutex);
 275         return len;
 276 }
 277
 278 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 279 {
 280         int status;
 281         struct buffer_head *bh = NULL;
 282
 283         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 284         if (status < 0)
 285                 return status;
 286         spin_lock(&dq_data_lock);
 287         if (!oinfo->dqi_gqi_count++)
 288                 oinfo->dqi_gqi_bh = bh;
 289         else
 290                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 291         spin_unlock(&dq_data_lock);
 292         return 0;
 293 }
 294
 295 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 296 {
 297         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 298         brelse(oinfo->dqi_gqi_bh);
 299         spin_lock(&dq_data_lock);
 300         if (!--oinfo->dqi_gqi_count)
 301                 oinfo->dqi_gqi_bh = NULL;
 302         spin_unlock(&dq_data_lock);
 303 }
 304
 305 /* Read information header from global quota file */
 306 int ocfs2_global_read_info(struct super_block *sb, int type)
 307 {
 308         struct inode *gqinode = NULL;
 309         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 310                                         GROUP_QUOTA_SYSTEM_INODE };
 311         struct ocfs2_global_disk_dqinfo dinfo;
 312         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 313         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 314         int status;
 315
 316         mlog_entry_void();
 317
 318         /* Read global header */
 319         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 320                         OCFS2_INVALID_SLOT);
 321         if (!gqinode) {
 322                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 323                         type);
 324                 status = -EINVAL;
 325                 goto out_err;
 326         }
 327         oinfo->dqi_gi.dqi_sb = sb;
 328         oinfo->dqi_gi.dqi_type = type;
 329         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 330         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 331         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 332         oinfo->dqi_gqi_bh = NULL;
 333         oinfo->dqi_gqi_count = 0;
 334         oinfo->dqi_gqinode = gqinode;
 335         status = ocfs2_lock_global_qf(oinfo, 0);
 336         if (status < 0) {
 337                 mlog_errno(status);
 338                 goto out_err;
 339         }
 340         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 341                                       sizeof(struct ocfs2_global_disk_dqinfo),
 342                                       OCFS2_GLOBAL_INFO_OFF);
 343         ocfs2_unlock_global_qf(oinfo, 0);
 344         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 345                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 346                      status);
 347                 if (status >= 0)
 348                         status = -EIO;
 349                 mlog_errno(status);
 350                 goto out_err;
 351         }
 352         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 353         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 354         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 355         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 356         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 357         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 358         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 359         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 360                                                 OCFS2_QBLK_RESERVED_SPACE;
 361         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 362         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 363         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 364                            msecs_to_jiffies(oinfo->dqi_syncms));
 365
 366 out_err:
 367         mlog_exit(status);
 368         return status;
 369 }
 370
 371 /* Write information to global quota file. Expects exlusive lock on quota
 372  * file inode and quota info */
 373 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 374 {
 375         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 376         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 377         struct ocfs2_global_disk_dqinfo dinfo;
 378         ssize_t size;
 379
 380         spin_lock(&dq_data_lock);
 381         info->dqi_flags &= ~DQF_INFO_DIRTY;
 382         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 383         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 384         spin_unlock(&dq_data_lock);
 385         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 386         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 387         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 388         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 389         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 390                                      sizeof(struct ocfs2_global_disk_dqinfo),
 391                                      OCFS2_GLOBAL_INFO_OFF);
 392         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 393                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 394                 if (size >= 0)
 395                         size = -EIO;
 396                 return size;
 397         }
 398         return 0;
 399 }
 400
 401 int ocfs2_global_write_info(struct super_block *sb, int type)
 402 {
 403         int err;
 404         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 405
 406         err = ocfs2_qinfo_lock(info, 1);
 407         if (err < 0)
 408                 return err;
 409         err = __ocfs2_global_write_info(sb, type);
 410         ocfs2_qinfo_unlock(info, 1);
 411         return err;
 412 }
 413
 414 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
 415 {
 416         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 417
 418         /*
 419          * We may need to allocate tree blocks and a leaf block but not the
 420          * root block
 421          */
 422         return oinfo->dqi_gi.dqi_qtree_depth;
 423 }
 424
 425 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
 426 {
 427         /* We modify all the allocated blocks, tree root, and info block */
 428         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
 429                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS;
 430 }
 431
 432 /* Read in information from global quota file and acquire a reference to it.
 433  * dquot_acquire() has already started the transaction and locked quota file */
 434 int ocfs2_global_read_dquot(struct dquot *dquot)
 435 {
 436         int err, err2, ex = 0;
 437         struct super_block *sb = dquot->dq_sb;
 438         int type = dquot->dq_type;
 439         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 440         struct ocfs2_super *osb = OCFS2_SB(sb);
 441         struct inode *gqinode = info->dqi_gqinode;
 442         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
 443         handle_t *handle = NULL;
 444
 445         err = ocfs2_qinfo_lock(info, 0);
 446         if (err < 0)
 447                 goto out;
 448         err = qtree_read_dquot(&info->dqi_gi, dquot);
 449         if (err < 0)
 450                 goto out_qlock;
 451         OCFS2_DQUOT(dquot)->dq_use_count++;
 452         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 453         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 454         ocfs2_qinfo_unlock(info, 0);
 455
 456         if (!dquot->dq_off) {   /* No real quota entry? */
 457                 ex = 1;
 458                 /*
 459                  * Add blocks to quota file before we start a transaction since
 460                  * locking allocators ranks above a transaction start
 461                  */
 462                 WARN_ON(journal_current_handle());
 463                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 464                 err = ocfs2_extend_no_holes(gqinode,
 465                         gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
 466                         gqinode->i_size);
 467                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 468                 if (err < 0)
 469                         goto out;
 470         }
 471
 472         handle = ocfs2_start_trans(osb,
 473                                    ocfs2_calc_global_qinit_credits(sb, type));
 474         if (IS_ERR(handle)) {
 475                 err = PTR_ERR(handle);
 476                 goto out;
 477         }
 478         err = ocfs2_qinfo_lock(info, ex);
 479         if (err < 0)
 480                 goto out_trans;
 481         err = qtree_write_dquot(&info->dqi_gi, dquot);
 482         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
 483                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
 484                 if (!err)
 485                         err = err2;
 486         }
 487 out_qlock:
 488         if (ex)
 489                 ocfs2_qinfo_unlock(info, 1);
 490         else
 491                 ocfs2_qinfo_unlock(info, 0);
 492 out_trans:
 493         if (handle)
 494                 ocfs2_commit_trans(osb, handle);
 495 out:
 496         if (err < 0)
 497                 mlog_errno(err);
 498         return err;
 499 }
 500
 501 /* Sync local information about quota modifications with global quota file.
 502  * Caller must have started the transaction and obtained exclusive lock for
 503  * global quota file inode */
 504 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 505 {
 506         int err, err2;
 507         struct super_block *sb = dquot->dq_sb;
 508         int type = dquot->dq_type;
 509         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 510         struct ocfs2_global_disk_dqblk dqblk;
 511         s64 spacechange, inodechange;
 512         time_t olditime, oldbtime;
 513
 514         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 515                                    sizeof(struct ocfs2_global_disk_dqblk),
 516                                    dquot->dq_off);
 517         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 518                 if (err >= 0) {
 519                         mlog(ML_ERROR, "Short read from global quota file "
 520                                        "(%u read)\n", err);
 521                         err = -EIO;
 522                 }
 523                 goto out;
 524         }
 525
 526         /* Update space and inode usage. Get also other information from
 527          * global quota file so that we don't overwrite any changes there.
 528          * We are */
 529         spin_lock(&dq_data_lock);
 530         spacechange = dquot->dq_dqb.dqb_curspace -
 531                                         OCFS2_DQUOT(dquot)->dq_origspace;
 532         inodechange = dquot->dq_dqb.dqb_curinodes -
 533                                         OCFS2_DQUOT(dquot)->dq_originodes;
 534         olditime = dquot->dq_dqb.dqb_itime;
 535         oldbtime = dquot->dq_dqb.dqb_btime;
 536         ocfs2_global_disk2memdqb(dquot, &dqblk);
 537         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
 538              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
 539              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
 540         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 541                 dquot->dq_dqb.dqb_curspace += spacechange;
 542         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 543                 dquot->dq_dqb.dqb_curinodes += inodechange;
 544         /* Set properly space grace time... */
 545         if (dquot->dq_dqb.dqb_bsoftlimit &&
 546             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 547                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 548                     oldbtime > 0) {
 549                         if (dquot->dq_dqb.dqb_btime > 0)
 550                                 dquot->dq_dqb.dqb_btime =
 551                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 552                         else
 553                                 dquot->dq_dqb.dqb_btime = oldbtime;
 554                 }
 555         } else {
 556                 dquot->dq_dqb.dqb_btime = 0;
 557                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 558         }
 559         /* Set properly inode grace time... */
 560         if (dquot->dq_dqb.dqb_isoftlimit &&
 561             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 562                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 563                     olditime > 0) {
 564                         if (dquot->dq_dqb.dqb_itime > 0)
 565                                 dquot->dq_dqb.dqb_itime =
 566                                         min(dquot->dq_dqb.dqb_itime, olditime);
 567                         else
 568                                 dquot->dq_dqb.dqb_itime = olditime;
 569                 }
 570         } else {
 571                 dquot->dq_dqb.dqb_itime = 0;
 572                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 573         }
 574         /* All information is properly updated, clear the flags */
 575         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 576         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 577         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 578         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 579         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 580         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 581         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 582         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 583         spin_unlock(&dq_data_lock);
 584         err = ocfs2_qinfo_lock(info, freeing);
 585         if (err < 0) {
 586                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 587                                " (type=%d, id=%u)\n", dquot->dq_type,
 588                                (unsigned)dquot->dq_id);
 589                 goto out;
 590         }
 591         if (freeing)
 592                 OCFS2_DQUOT(dquot)->dq_use_count--;
 593         err = qtree_write_dquot(&info->dqi_gi, dquot);
 594         if (err < 0)
 595                 goto out_qlock;
 596         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 597                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 598                 if (info_dirty(sb_dqinfo(sb, type))) {
 599                         err2 = __ocfs2_global_write_info(sb, type);
 600                         if (!err)
 601                                 err = err2;
 602                 }
 603         }
 604 out_qlock:
 605         ocfs2_qinfo_unlock(info, freeing);
 606 out:
 607         if (err < 0)
 608                 mlog_errno(err);
 609         return err;
 610 }
 611
 612 /*
 613  *  Functions for periodic syncing of dquots with global file
 614  */
 615 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 616 {
 617         handle_t *handle;
 618         struct super_block *sb = dquot->dq_sb;
 619         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 620         struct ocfs2_super *osb = OCFS2_SB(sb);
 621         int status = 0;
 622
 623         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 624                    dquot->dq_type, type, sb->s_id);
 625         if (type != dquot->dq_type)
 626                 goto out;
 627         status = ocfs2_lock_global_qf(oinfo, 1);
 628         if (status < 0)
 629                 goto out;
 630
 631         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 632         if (IS_ERR(handle)) {
 633                 status = PTR_ERR(handle);
 634                 mlog_errno(status);
 635                 goto out_ilock;
 636         }
 637         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 638         status = ocfs2_sync_dquot(dquot);
 639         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 640         if (status < 0)
 641                 mlog_errno(status);
 642         /* We have to write local structure as well... */
 643         dquot_mark_dquot_dirty(dquot);
 644         status = dquot_commit(dquot);
 645         if (status < 0)
 646                 mlog_errno(status);
 647         ocfs2_commit_trans(osb, handle);
 648 out_ilock:
 649         ocfs2_unlock_global_qf(oinfo, 1);
 650 out:
 651         mlog_exit(status);
 652         return status;
 653 }
 654
 655 static void qsync_work_fn(struct work_struct *work)
 656 {
 657         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 658                                                       struct ocfs2_mem_dqinfo,
 659                                                       dqi_sync_work.work);
 660         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 661
 662         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 663         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 664                            msecs_to_jiffies(oinfo->dqi_syncms));
 665 }
 666
 667 /*
 668  *  Wrappers for generic quota functions
 669  */
 670
 671 static int ocfs2_write_dquot(struct dquot *dquot)
 672 {
 673         handle_t *handle;
 674         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 675         int status = 0;
 676
 677         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 678
 679         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 680         if (IS_ERR(handle)) {
 681                 status = PTR_ERR(handle);
 682                 mlog_errno(status);
 683                 goto out;
 684         }
 685         status = dquot_commit(dquot);
 686         ocfs2_commit_trans(osb, handle);
 687 out:
 688         mlog_exit(status);
 689         return status;
 690 }
 691
 692 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 693 {
 694         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 695         /*
 696          * We modify tree, leaf block, global info, local chunk header,
 697          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
 698          * accounts for inode update
 699          */
 700         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
 701                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
 702                OCFS2_QINFO_WRITE_CREDITS +
 703                OCFS2_INODE_UPDATE_CREDITS;
 704 }
 705
 706 static int ocfs2_release_dquot(struct dquot *dquot)
 707 {
 708         handle_t *handle;
 709         struct ocfs2_mem_dqinfo *oinfo =
 710                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 711         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 712         int status = 0;
 713
 714         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 715
 716         status = ocfs2_lock_global_qf(oinfo, 1);
 717         if (status < 0)
 718                 goto out;
 719         handle = ocfs2_start_trans(osb,
 720                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 721         if (IS_ERR(handle)) {
 722                 status = PTR_ERR(handle);
 723                 mlog_errno(status);
 724                 goto out_ilock;
 725         }
 726         status = dquot_release(dquot);
 727         ocfs2_commit_trans(osb, handle);
 728 out_ilock:
 729         ocfs2_unlock_global_qf(oinfo, 1);
 730 out:
 731         mlog_exit(status);
 732         return status;
 733 }
 734
 735 static int ocfs2_acquire_dquot(struct dquot *dquot)
 736 {
 737         struct ocfs2_mem_dqinfo *oinfo =
 738                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 739         int status = 0;
 740
 741         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 742         /* We need an exclusive lock, because we're going to update use count
 743          * and instantiate possibly new dquot structure */
 744         status = ocfs2_lock_global_qf(oinfo, 1);
 745         if (status < 0)
 746                 goto out;
 747         status = dquot_acquire(dquot);
 748         ocfs2_unlock_global_qf(oinfo, 1);
 749 out:
 750         mlog_exit(status);
 751         return status;
 752 }
 753
 754 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 755 {
 756         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 757                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 758                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 759                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 760                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 761                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 762         int sync = 0;
 763         int status;
 764         struct super_block *sb = dquot->dq_sb;
 765         int type = dquot->dq_type;
 766         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 767         handle_t *handle;
 768         struct ocfs2_super *osb = OCFS2_SB(sb);
 769
 770         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 771         dquot_mark_dquot_dirty(dquot);
 772
 773         /* In case user set some limits, sync dquot immediately to global
 774          * quota file so that information propagates quicker */
 775         spin_lock(&dq_data_lock);
 776         if (dquot->dq_flags & mask)
 777                 sync = 1;
 778         spin_unlock(&dq_data_lock);
 779         /* This is a slight hack but we can't afford getting global quota
 780          * lock if we already have a transaction started. */
 781         if (!sync || journal_current_handle()) {
 782                 status = ocfs2_write_dquot(dquot);
 783                 goto out;
 784         }
 785         status = ocfs2_lock_global_qf(oinfo, 1);
 786         if (status < 0)
 787                 goto out;
 788         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 789         if (IS_ERR(handle)) {
 790                 status = PTR_ERR(handle);
 791                 mlog_errno(status);
 792                 goto out_ilock;
 793         }
 794         status = ocfs2_sync_dquot(dquot);
 795         if (status < 0) {
 796                 mlog_errno(status);
 797                 goto out_trans;
 798         }
 799         /* Now write updated local dquot structure */
 800         status = dquot_commit(dquot);
 801 out_trans:
 802         ocfs2_commit_trans(osb, handle);
 803 out_ilock:
 804         ocfs2_unlock_global_qf(oinfo, 1);
 805 out:
 806         mlog_exit(status);
 807         return status;
 808 }
 809
 810 /* This should happen only after set_dqinfo(). */
 811 static int ocfs2_write_info(struct super_block *sb, int type)
 812 {
 813         handle_t *handle;
 814         int status = 0;
 815         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 816
 817         mlog_entry_void();
 818
 819         status = ocfs2_lock_global_qf(oinfo, 1);
 820         if (status < 0)
 821                 goto out;
 822         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 823         if (IS_ERR(handle)) {
 824                 status = PTR_ERR(handle);
 825                 mlog_errno(status);
 826                 goto out_ilock;
 827         }
 828         status = dquot_commit_info(sb, type);
 829         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 830 out_ilock:
 831         ocfs2_unlock_global_qf(oinfo, 1);
 832 out:
 833         mlog_exit(status);
 834         return status;
 835 }
 836
 837 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 838 {
 839         struct ocfs2_dquot *dquot =
 840                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 841
 842         if (!dquot)
 843                 return NULL;
 844         return &dquot->dq_dquot;
 845 }
 846
 847 static void ocfs2_destroy_dquot(struct dquot *dquot)
 848 {
 849         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 850 }
 851
 852 struct dquot_operations ocfs2_quota_operations = {
 853         .initialize     = dquot_initialize,
 854         .drop           = dquot_drop,
 855         .alloc_space    = dquot_alloc_space,
 856         .alloc_inode    = dquot_alloc_inode,
 857         .free_space     = dquot_free_space,
 858         .free_inode     = dquot_free_inode,
 859         .transfer       = dquot_transfer,
 860         .write_dquot    = ocfs2_write_dquot,
 861         .acquire_dquot  = ocfs2_acquire_dquot,
 862         .release_dquot  = ocfs2_release_dquot,
 863         .mark_dirty     = ocfs2_mark_dquot_dirty,
 864         .write_info     = ocfs2_write_info,
 865         .alloc_dquot    = ocfs2_alloc_dquot,
 866         .destroy_dquot  = ocfs2_destroy_dquot,
 867 };
 868
 869 int ocfs2_quota_setup(void)
 870 {
 871         ocfs2_quota_wq = create_workqueue("o2quot");
 872         if (!ocfs2_quota_wq)
 873                 return -ENOMEM;
 874         return 0;
 875 }
 876
 877 void ocfs2_quota_shutdown(void)
 878 {
 879         if (ocfs2_quota_wq) {
 880                 flush_workqueue(ocfs2_quota_wq);
 881                 destroy_workqueue(ocfs2_quota_wq);
 882                 ocfs2_quota_wq = NULL;
 883         }
 884 }