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   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(INODE_CACHE(gqinode), bh);
 257         err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
 258                                       ja_type);
 259         if (err < 0) {
 260                 brelse(bh);
 261                 goto out;
 262         }
 263         ocfs2_journal_dirty(handle, bh);
 264         brelse(bh);
 265 out:
 266         if (err) {
 267                 mutex_unlock(&gqinode->i_mutex);
 268                 mlog_errno(err);
 269                 return err;
 270         }
 271         gqinode->i_version++;
 272         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 273         mutex_unlock(&gqinode->i_mutex);
 274         return len;
 275 }
 276
 277 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 278 {
 279         int status;
 280         struct buffer_head *bh = NULL;
 281
 282         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 283         if (status < 0)
 284                 return status;
 285         spin_lock(&dq_data_lock);
 286         if (!oinfo->dqi_gqi_count++)
 287                 oinfo->dqi_gqi_bh = bh;
 288         else
 289                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 290         spin_unlock(&dq_data_lock);
 291         return 0;
 292 }
 293
 294 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 295 {
 296         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 297         brelse(oinfo->dqi_gqi_bh);
 298         spin_lock(&dq_data_lock);
 299         if (!--oinfo->dqi_gqi_count)
 300                 oinfo->dqi_gqi_bh = NULL;
 301         spin_unlock(&dq_data_lock);
 302 }
 303
 304 /* Read information header from global quota file */
 305 int ocfs2_global_read_info(struct super_block *sb, int type)
 306 {
 307         struct inode *gqinode = NULL;
 308         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 309                                         GROUP_QUOTA_SYSTEM_INODE };
 310         struct ocfs2_global_disk_dqinfo dinfo;
 311         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 312         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 313         int status;
 314
 315         mlog_entry_void();
 316
 317         /* Read global header */
 318         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 319                         OCFS2_INVALID_SLOT);
 320         if (!gqinode) {
 321                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 322                         type);
 323                 status = -EINVAL;
 324                 goto out_err;
 325         }
 326         oinfo->dqi_gi.dqi_sb = sb;
 327         oinfo->dqi_gi.dqi_type = type;
 328         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 329         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 330         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 331         oinfo->dqi_gqi_bh = NULL;
 332         oinfo->dqi_gqi_count = 0;
 333         oinfo->dqi_gqinode = gqinode;
 334         status = ocfs2_lock_global_qf(oinfo, 0);
 335         if (status < 0) {
 336                 mlog_errno(status);
 337                 goto out_err;
 338         }
 339         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 340                                       sizeof(struct ocfs2_global_disk_dqinfo),
 341                                       OCFS2_GLOBAL_INFO_OFF);
 342         ocfs2_unlock_global_qf(oinfo, 0);
 343         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 344                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 345                      status);
 346                 if (status >= 0)
 347                         status = -EIO;
 348                 mlog_errno(status);
 349                 goto out_err;
 350         }
 351         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 352         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 353         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 354         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 355         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 356         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 357         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 358         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 359                                                 OCFS2_QBLK_RESERVED_SPACE;
 360         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 361         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 362         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 363                            msecs_to_jiffies(oinfo->dqi_syncms));
 364
 365 out_err:
 366         mlog_exit(status);
 367         return status;
 368 }
 369
 370 /* Write information to global quota file. Expects exlusive lock on quota
 371  * file inode and quota info */
 372 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 373 {
 374         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 375         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 376         struct ocfs2_global_disk_dqinfo dinfo;
 377         ssize_t size;
 378
 379         spin_lock(&dq_data_lock);
 380         info->dqi_flags &= ~DQF_INFO_DIRTY;
 381         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 382         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 383         spin_unlock(&dq_data_lock);
 384         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 385         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 386         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 387         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 388         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 389                                      sizeof(struct ocfs2_global_disk_dqinfo),
 390                                      OCFS2_GLOBAL_INFO_OFF);
 391         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 392                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 393                 if (size >= 0)
 394                         size = -EIO;
 395                 return size;
 396         }
 397         return 0;
 398 }
 399
 400 int ocfs2_global_write_info(struct super_block *sb, int type)
 401 {
 402         int err;
 403         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 404
 405         err = ocfs2_qinfo_lock(info, 1);
 406         if (err < 0)
 407                 return err;
 408         err = __ocfs2_global_write_info(sb, type);
 409         ocfs2_qinfo_unlock(info, 1);
 410         return err;
 411 }
 412
 413 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
 414 {
 415         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 416
 417         /*
 418          * We may need to allocate tree blocks and a leaf block but not the
 419          * root block
 420          */
 421         return oinfo->dqi_gi.dqi_qtree_depth;
 422 }
 423
 424 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
 425 {
 426         /* We modify all the allocated blocks, tree root, and info block */
 427         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
 428                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS;
 429 }
 430
 431 /* Read in information from global quota file and acquire a reference to it.
 432  * dquot_acquire() has already started the transaction and locked quota file */
 433 int ocfs2_global_read_dquot(struct dquot *dquot)
 434 {
 435         int err, err2, ex = 0;
 436         struct super_block *sb = dquot->dq_sb;
 437         int type = dquot->dq_type;
 438         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 439         struct ocfs2_super *osb = OCFS2_SB(sb);
 440         struct inode *gqinode = info->dqi_gqinode;
 441         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
 442         handle_t *handle = NULL;
 443
 444         err = ocfs2_qinfo_lock(info, 0);
 445         if (err < 0)
 446                 goto out;
 447         err = qtree_read_dquot(&info->dqi_gi, dquot);
 448         if (err < 0)
 449                 goto out_qlock;
 450         OCFS2_DQUOT(dquot)->dq_use_count++;
 451         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 452         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 453         ocfs2_qinfo_unlock(info, 0);
 454
 455         if (!dquot->dq_off) {   /* No real quota entry? */
 456                 ex = 1;
 457                 /*
 458                  * Add blocks to quota file before we start a transaction since
 459                  * locking allocators ranks above a transaction start
 460                  */
 461                 WARN_ON(journal_current_handle());
 462                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 463                 err = ocfs2_extend_no_holes(gqinode,
 464                         gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
 465                         gqinode->i_size);
 466                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 467                 if (err < 0)
 468                         goto out;
 469         }
 470
 471         handle = ocfs2_start_trans(osb,
 472                                    ocfs2_calc_global_qinit_credits(sb, type));
 473         if (IS_ERR(handle)) {
 474                 err = PTR_ERR(handle);
 475                 goto out;
 476         }
 477         err = ocfs2_qinfo_lock(info, ex);
 478         if (err < 0)
 479                 goto out_trans;
 480         err = qtree_write_dquot(&info->dqi_gi, dquot);
 481         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
 482                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
 483                 if (!err)
 484                         err = err2;
 485         }
 486 out_qlock:
 487         if (ex)
 488                 ocfs2_qinfo_unlock(info, 1);
 489         else
 490                 ocfs2_qinfo_unlock(info, 0);
 491 out_trans:
 492         if (handle)
 493                 ocfs2_commit_trans(osb, handle);
 494 out:
 495         if (err < 0)
 496                 mlog_errno(err);
 497         return err;
 498 }
 499
 500 /* Sync local information about quota modifications with global quota file.
 501  * Caller must have started the transaction and obtained exclusive lock for
 502  * global quota file inode */
 503 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 504 {
 505         int err, err2;
 506         struct super_block *sb = dquot->dq_sb;
 507         int type = dquot->dq_type;
 508         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 509         struct ocfs2_global_disk_dqblk dqblk;
 510         s64 spacechange, inodechange;
 511         time_t olditime, oldbtime;
 512
 513         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 514                                    sizeof(struct ocfs2_global_disk_dqblk),
 515                                    dquot->dq_off);
 516         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 517                 if (err >= 0) {
 518                         mlog(ML_ERROR, "Short read from global quota file "
 519                                        "(%u read)\n", err);
 520                         err = -EIO;
 521                 }
 522                 goto out;
 523         }
 524
 525         /* Update space and inode usage. Get also other information from
 526          * global quota file so that we don't overwrite any changes there.
 527          * We are */
 528         spin_lock(&dq_data_lock);
 529         spacechange = dquot->dq_dqb.dqb_curspace -
 530                                         OCFS2_DQUOT(dquot)->dq_origspace;
 531         inodechange = dquot->dq_dqb.dqb_curinodes -
 532                                         OCFS2_DQUOT(dquot)->dq_originodes;
 533         olditime = dquot->dq_dqb.dqb_itime;
 534         oldbtime = dquot->dq_dqb.dqb_btime;
 535         ocfs2_global_disk2memdqb(dquot, &dqblk);
 536         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
 537              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
 538              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
 539         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 540                 dquot->dq_dqb.dqb_curspace += spacechange;
 541         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 542                 dquot->dq_dqb.dqb_curinodes += inodechange;
 543         /* Set properly space grace time... */
 544         if (dquot->dq_dqb.dqb_bsoftlimit &&
 545             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 546                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 547                     oldbtime > 0) {
 548                         if (dquot->dq_dqb.dqb_btime > 0)
 549                                 dquot->dq_dqb.dqb_btime =
 550                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 551                         else
 552                                 dquot->dq_dqb.dqb_btime = oldbtime;
 553                 }
 554         } else {
 555                 dquot->dq_dqb.dqb_btime = 0;
 556                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 557         }
 558         /* Set properly inode grace time... */
 559         if (dquot->dq_dqb.dqb_isoftlimit &&
 560             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 561                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 562                     olditime > 0) {
 563                         if (dquot->dq_dqb.dqb_itime > 0)
 564                                 dquot->dq_dqb.dqb_itime =
 565                                         min(dquot->dq_dqb.dqb_itime, olditime);
 566                         else
 567                                 dquot->dq_dqb.dqb_itime = olditime;
 568                 }
 569         } else {
 570                 dquot->dq_dqb.dqb_itime = 0;
 571                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 572         }
 573         /* All information is properly updated, clear the flags */
 574         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 575         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 576         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 577         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 578         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 579         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 580         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 581         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 582         spin_unlock(&dq_data_lock);
 583         err = ocfs2_qinfo_lock(info, freeing);
 584         if (err < 0) {
 585                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 586                                " (type=%d, id=%u)\n", dquot->dq_type,
 587                                (unsigned)dquot->dq_id);
 588                 goto out;
 589         }
 590         if (freeing)
 591                 OCFS2_DQUOT(dquot)->dq_use_count--;
 592         err = qtree_write_dquot(&info->dqi_gi, dquot);
 593         if (err < 0)
 594                 goto out_qlock;
 595         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 596                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 597                 if (info_dirty(sb_dqinfo(sb, type))) {
 598                         err2 = __ocfs2_global_write_info(sb, type);
 599                         if (!err)
 600                                 err = err2;
 601                 }
 602         }
 603 out_qlock:
 604         ocfs2_qinfo_unlock(info, freeing);
 605 out:
 606         if (err < 0)
 607                 mlog_errno(err);
 608         return err;
 609 }
 610
 611 /*
 612  *  Functions for periodic syncing of dquots with global file
 613  */
 614 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 615 {
 616         handle_t *handle;
 617         struct super_block *sb = dquot->dq_sb;
 618         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 619         struct ocfs2_super *osb = OCFS2_SB(sb);
 620         int status = 0;
 621
 622         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 623                    dquot->dq_type, type, sb->s_id);
 624         if (type != dquot->dq_type)
 625                 goto out;
 626         status = ocfs2_lock_global_qf(oinfo, 1);
 627         if (status < 0)
 628                 goto out;
 629
 630         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 631         if (IS_ERR(handle)) {
 632                 status = PTR_ERR(handle);
 633                 mlog_errno(status);
 634                 goto out_ilock;
 635         }
 636         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 637         status = ocfs2_sync_dquot(dquot);
 638         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 639         if (status < 0)
 640                 mlog_errno(status);
 641         /* We have to write local structure as well... */
 642         dquot_mark_dquot_dirty(dquot);
 643         status = dquot_commit(dquot);
 644         if (status < 0)
 645                 mlog_errno(status);
 646         ocfs2_commit_trans(osb, handle);
 647 out_ilock:
 648         ocfs2_unlock_global_qf(oinfo, 1);
 649 out:
 650         mlog_exit(status);
 651         return status;
 652 }
 653
 654 static void qsync_work_fn(struct work_struct *work)
 655 {
 656         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 657                                                       struct ocfs2_mem_dqinfo,
 658                                                       dqi_sync_work.work);
 659         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 660
 661         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 662         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 663                            msecs_to_jiffies(oinfo->dqi_syncms));
 664 }
 665
 666 /*
 667  *  Wrappers for generic quota functions
 668  */
 669
 670 static int ocfs2_write_dquot(struct dquot *dquot)
 671 {
 672         handle_t *handle;
 673         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 674         int status = 0;
 675
 676         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 677
 678         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 679         if (IS_ERR(handle)) {
 680                 status = PTR_ERR(handle);
 681                 mlog_errno(status);
 682                 goto out;
 683         }
 684         status = dquot_commit(dquot);
 685         ocfs2_commit_trans(osb, handle);
 686 out:
 687         mlog_exit(status);
 688         return status;
 689 }
 690
 691 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 692 {
 693         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 694         /*
 695          * We modify tree, leaf block, global info, local chunk header,
 696          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
 697          * accounts for inode update
 698          */
 699         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
 700                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
 701                OCFS2_QINFO_WRITE_CREDITS +
 702                OCFS2_INODE_UPDATE_CREDITS;
 703 }
 704
 705 static int ocfs2_release_dquot(struct dquot *dquot)
 706 {
 707         handle_t *handle;
 708         struct ocfs2_mem_dqinfo *oinfo =
 709                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 710         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 711         int status = 0;
 712
 713         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 714
 715         status = ocfs2_lock_global_qf(oinfo, 1);
 716         if (status < 0)
 717                 goto out;
 718         handle = ocfs2_start_trans(osb,
 719                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 720         if (IS_ERR(handle)) {
 721                 status = PTR_ERR(handle);
 722                 mlog_errno(status);
 723                 goto out_ilock;
 724         }
 725         status = dquot_release(dquot);
 726         ocfs2_commit_trans(osb, handle);
 727 out_ilock:
 728         ocfs2_unlock_global_qf(oinfo, 1);
 729 out:
 730         mlog_exit(status);
 731         return status;
 732 }
 733
 734 static int ocfs2_acquire_dquot(struct dquot *dquot)
 735 {
 736         struct ocfs2_mem_dqinfo *oinfo =
 737                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 738         int status = 0;
 739
 740         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 741         /* We need an exclusive lock, because we're going to update use count
 742          * and instantiate possibly new dquot structure */
 743         status = ocfs2_lock_global_qf(oinfo, 1);
 744         if (status < 0)
 745                 goto out;
 746         status = dquot_acquire(dquot);
 747         ocfs2_unlock_global_qf(oinfo, 1);
 748 out:
 749         mlog_exit(status);
 750         return status;
 751 }
 752
 753 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 754 {
 755         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 756                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 757                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 758                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 759                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 760                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 761         int sync = 0;
 762         int status;
 763         struct super_block *sb = dquot->dq_sb;
 764         int type = dquot->dq_type;
 765         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 766         handle_t *handle;
 767         struct ocfs2_super *osb = OCFS2_SB(sb);
 768
 769         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 770         dquot_mark_dquot_dirty(dquot);
 771
 772         /* In case user set some limits, sync dquot immediately to global
 773          * quota file so that information propagates quicker */
 774         spin_lock(&dq_data_lock);
 775         if (dquot->dq_flags & mask)
 776                 sync = 1;
 777         spin_unlock(&dq_data_lock);
 778         /* This is a slight hack but we can't afford getting global quota
 779          * lock if we already have a transaction started. */
 780         if (!sync || journal_current_handle()) {
 781                 status = ocfs2_write_dquot(dquot);
 782                 goto out;
 783         }
 784         status = ocfs2_lock_global_qf(oinfo, 1);
 785         if (status < 0)
 786                 goto out;
 787         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 788         if (IS_ERR(handle)) {
 789                 status = PTR_ERR(handle);
 790                 mlog_errno(status);
 791                 goto out_ilock;
 792         }
 793         status = ocfs2_sync_dquot(dquot);
 794         if (status < 0) {
 795                 mlog_errno(status);
 796                 goto out_trans;
 797         }
 798         /* Now write updated local dquot structure */
 799         status = dquot_commit(dquot);
 800 out_trans:
 801         ocfs2_commit_trans(osb, handle);
 802 out_ilock:
 803         ocfs2_unlock_global_qf(oinfo, 1);
 804 out:
 805         mlog_exit(status);
 806         return status;
 807 }
 808
 809 /* This should happen only after set_dqinfo(). */
 810 static int ocfs2_write_info(struct super_block *sb, int type)
 811 {
 812         handle_t *handle;
 813         int status = 0;
 814         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 815
 816         mlog_entry_void();
 817
 818         status = ocfs2_lock_global_qf(oinfo, 1);
 819         if (status < 0)
 820                 goto out;
 821         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 822         if (IS_ERR(handle)) {
 823                 status = PTR_ERR(handle);
 824                 mlog_errno(status);
 825                 goto out_ilock;
 826         }
 827         status = dquot_commit_info(sb, type);
 828         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 829 out_ilock:
 830         ocfs2_unlock_global_qf(oinfo, 1);
 831 out:
 832         mlog_exit(status);
 833         return status;
 834 }
 835
 836 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 837 {
 838         struct ocfs2_dquot *dquot =
 839                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 840
 841         if (!dquot)
 842                 return NULL;
 843         return &dquot->dq_dquot;
 844 }
 845
 846 static void ocfs2_destroy_dquot(struct dquot *dquot)
 847 {
 848         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 849 }
 850
 851 const struct dquot_operations ocfs2_quota_operations = {
 852         .write_dquot    = ocfs2_write_dquot,
 853         .acquire_dquot  = ocfs2_acquire_dquot,
 854         .release_dquot  = ocfs2_release_dquot,
 855         .mark_dirty     = ocfs2_mark_dquot_dirty,
 856         .write_info     = ocfs2_write_info,
 857         .alloc_dquot    = ocfs2_alloc_dquot,
 858         .destroy_dquot  = ocfs2_destroy_dquot,
 859 };
 860
 861 int ocfs2_quota_setup(void)
 862 {
 863         ocfs2_quota_wq = create_workqueue("o2quot");
 864         if (!ocfs2_quota_wq)
 865                 return -ENOMEM;
 866         return 0;
 867 }
 868
 869 void ocfs2_quota_shutdown(void)
 870 {
 871         if (ocfs2_quota_wq) {
 872                 flush_workqueue(ocfs2_quota_wq);
 873                 destroy_workqueue(ocfs2_quota_wq);
 874                 ocfs2_quota_wq = NULL;
 875         }
 876 }