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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         err = ocfs2_journal_dirty(handle, bh);
 264         brelse(bh);
 265         if (err < 0)
 266                 goto out;
 267 out:
 268         if (err) {
 269                 mutex_unlock(&gqinode->i_mutex);
 270                 mlog_errno(err);
 271                 return err;
 272         }
 273         gqinode->i_version++;
 274         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 275         mutex_unlock(&gqinode->i_mutex);
 276         return len;
 277 }
 278
 279 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 280 {
 281         int status;
 282         struct buffer_head *bh = NULL;
 283
 284         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 285         if (status < 0)
 286                 return status;
 287         spin_lock(&dq_data_lock);
 288         if (!oinfo->dqi_gqi_count++)
 289                 oinfo->dqi_gqi_bh = bh;
 290         else
 291                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 292         spin_unlock(&dq_data_lock);
 293         return 0;
 294 }
 295
 296 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 297 {
 298         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 299         brelse(oinfo->dqi_gqi_bh);
 300         spin_lock(&dq_data_lock);
 301         if (!--oinfo->dqi_gqi_count)
 302                 oinfo->dqi_gqi_bh = NULL;
 303         spin_unlock(&dq_data_lock);
 304 }
 305
 306 /* Read information header from global quota file */
 307 int ocfs2_global_read_info(struct super_block *sb, int type)
 308 {
 309         struct inode *gqinode = NULL;
 310         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 311                                         GROUP_QUOTA_SYSTEM_INODE };
 312         struct ocfs2_global_disk_dqinfo dinfo;
 313         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 314         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 315         int status;
 316
 317         mlog_entry_void();
 318
 319         /* Read global header */
 320         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 321                         OCFS2_INVALID_SLOT);
 322         if (!gqinode) {
 323                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 324                         type);
 325                 status = -EINVAL;
 326                 goto out_err;
 327         }
 328         oinfo->dqi_gi.dqi_sb = sb;
 329         oinfo->dqi_gi.dqi_type = type;
 330         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 331         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 332         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 333         oinfo->dqi_gqi_bh = NULL;
 334         oinfo->dqi_gqi_count = 0;
 335         oinfo->dqi_gqinode = gqinode;
 336         status = ocfs2_lock_global_qf(oinfo, 0);
 337         if (status < 0) {
 338                 mlog_errno(status);
 339                 goto out_err;
 340         }
 341         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 342                                       sizeof(struct ocfs2_global_disk_dqinfo),
 343                                       OCFS2_GLOBAL_INFO_OFF);
 344         ocfs2_unlock_global_qf(oinfo, 0);
 345         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 346                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 347                      status);
 348                 if (status >= 0)
 349                         status = -EIO;
 350                 mlog_errno(status);
 351                 goto out_err;
 352         }
 353         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 354         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 355         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 356         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 357         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 358         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 359         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 360         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 361                                                 OCFS2_QBLK_RESERVED_SPACE;
 362         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 363         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 364         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 365                            msecs_to_jiffies(oinfo->dqi_syncms));
 366
 367 out_err:
 368         mlog_exit(status);
 369         return status;
 370 }
 371
 372 /* Write information to global quota file. Expects exlusive lock on quota
 373  * file inode and quota info */
 374 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 375 {
 376         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 377         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 378         struct ocfs2_global_disk_dqinfo dinfo;
 379         ssize_t size;
 380
 381         spin_lock(&dq_data_lock);
 382         info->dqi_flags &= ~DQF_INFO_DIRTY;
 383         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 384         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 385         spin_unlock(&dq_data_lock);
 386         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 387         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 388         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 389         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 390         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 391                                      sizeof(struct ocfs2_global_disk_dqinfo),
 392                                      OCFS2_GLOBAL_INFO_OFF);
 393         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 394                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 395                 if (size >= 0)
 396                         size = -EIO;
 397                 return size;
 398         }
 399         return 0;
 400 }
 401
 402 int ocfs2_global_write_info(struct super_block *sb, int type)
 403 {
 404         int err;
 405         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 406
 407         err = ocfs2_qinfo_lock(info, 1);
 408         if (err < 0)
 409                 return err;
 410         err = __ocfs2_global_write_info(sb, type);
 411         ocfs2_qinfo_unlock(info, 1);
 412         return err;
 413 }
 414
 415 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
 416 {
 417         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 418
 419         /*
 420          * We may need to allocate tree blocks and a leaf block but not the
 421          * root block
 422          */
 423         return oinfo->dqi_gi.dqi_qtree_depth;
 424 }
 425
 426 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
 427 {
 428         /* We modify all the allocated blocks, tree root, and info block */
 429         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
 430                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS;
 431 }
 432
 433 /* Read in information from global quota file and acquire a reference to it.
 434  * dquot_acquire() has already started the transaction and locked quota file */
 435 int ocfs2_global_read_dquot(struct dquot *dquot)
 436 {
 437         int err, err2, ex = 0;
 438         struct super_block *sb = dquot->dq_sb;
 439         int type = dquot->dq_type;
 440         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 441         struct ocfs2_super *osb = OCFS2_SB(sb);
 442         struct inode *gqinode = info->dqi_gqinode;
 443         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
 444         handle_t *handle = NULL;
 445
 446         err = ocfs2_qinfo_lock(info, 0);
 447         if (err < 0)
 448                 goto out;
 449         err = qtree_read_dquot(&info->dqi_gi, dquot);
 450         if (err < 0)
 451                 goto out_qlock;
 452         OCFS2_DQUOT(dquot)->dq_use_count++;
 453         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 454         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 455         ocfs2_qinfo_unlock(info, 0);
 456
 457         if (!dquot->dq_off) {   /* No real quota entry? */
 458                 ex = 1;
 459                 /*
 460                  * Add blocks to quota file before we start a transaction since
 461                  * locking allocators ranks above a transaction start
 462                  */
 463                 WARN_ON(journal_current_handle());
 464                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 465                 err = ocfs2_extend_no_holes(gqinode,
 466                         gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
 467                         gqinode->i_size);
 468                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 469                 if (err < 0)
 470                         goto out;
 471         }
 472
 473         handle = ocfs2_start_trans(osb,
 474                                    ocfs2_calc_global_qinit_credits(sb, type));
 475         if (IS_ERR(handle)) {
 476                 err = PTR_ERR(handle);
 477                 goto out;
 478         }
 479         err = ocfs2_qinfo_lock(info, ex);
 480         if (err < 0)
 481                 goto out_trans;
 482         err = qtree_write_dquot(&info->dqi_gi, dquot);
 483         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
 484                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
 485                 if (!err)
 486                         err = err2;
 487         }
 488 out_qlock:
 489         if (ex)
 490                 ocfs2_qinfo_unlock(info, 1);
 491         else
 492                 ocfs2_qinfo_unlock(info, 0);
 493 out_trans:
 494         if (handle)
 495                 ocfs2_commit_trans(osb, handle);
 496 out:
 497         if (err < 0)
 498                 mlog_errno(err);
 499         return err;
 500 }
 501
 502 /* Sync local information about quota modifications with global quota file.
 503  * Caller must have started the transaction and obtained exclusive lock for
 504  * global quota file inode */
 505 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 506 {
 507         int err, err2;
 508         struct super_block *sb = dquot->dq_sb;
 509         int type = dquot->dq_type;
 510         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 511         struct ocfs2_global_disk_dqblk dqblk;
 512         s64 spacechange, inodechange;
 513         time_t olditime, oldbtime;
 514
 515         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 516                                    sizeof(struct ocfs2_global_disk_dqblk),
 517                                    dquot->dq_off);
 518         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 519                 if (err >= 0) {
 520                         mlog(ML_ERROR, "Short read from global quota file "
 521                                        "(%u read)\n", err);
 522                         err = -EIO;
 523                 }
 524                 goto out;
 525         }
 526
 527         /* Update space and inode usage. Get also other information from
 528          * global quota file so that we don't overwrite any changes there.
 529          * We are */
 530         spin_lock(&dq_data_lock);
 531         spacechange = dquot->dq_dqb.dqb_curspace -
 532                                         OCFS2_DQUOT(dquot)->dq_origspace;
 533         inodechange = dquot->dq_dqb.dqb_curinodes -
 534                                         OCFS2_DQUOT(dquot)->dq_originodes;
 535         olditime = dquot->dq_dqb.dqb_itime;
 536         oldbtime = dquot->dq_dqb.dqb_btime;
 537         ocfs2_global_disk2memdqb(dquot, &dqblk);
 538         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
 539              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
 540              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
 541         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 542                 dquot->dq_dqb.dqb_curspace += spacechange;
 543         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 544                 dquot->dq_dqb.dqb_curinodes += inodechange;
 545         /* Set properly space grace time... */
 546         if (dquot->dq_dqb.dqb_bsoftlimit &&
 547             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 548                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 549                     oldbtime > 0) {
 550                         if (dquot->dq_dqb.dqb_btime > 0)
 551                                 dquot->dq_dqb.dqb_btime =
 552                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 553                         else
 554                                 dquot->dq_dqb.dqb_btime = oldbtime;
 555                 }
 556         } else {
 557                 dquot->dq_dqb.dqb_btime = 0;
 558                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 559         }
 560         /* Set properly inode grace time... */
 561         if (dquot->dq_dqb.dqb_isoftlimit &&
 562             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 563                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 564                     olditime > 0) {
 565                         if (dquot->dq_dqb.dqb_itime > 0)
 566                                 dquot->dq_dqb.dqb_itime =
 567                                         min(dquot->dq_dqb.dqb_itime, olditime);
 568                         else
 569                                 dquot->dq_dqb.dqb_itime = olditime;
 570                 }
 571         } else {
 572                 dquot->dq_dqb.dqb_itime = 0;
 573                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 574         }
 575         /* All information is properly updated, clear the flags */
 576         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 577         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 578         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 579         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 580         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 581         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 582         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 583         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 584         spin_unlock(&dq_data_lock);
 585         err = ocfs2_qinfo_lock(info, freeing);
 586         if (err < 0) {
 587                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 588                                " (type=%d, id=%u)\n", dquot->dq_type,
 589                                (unsigned)dquot->dq_id);
 590                 goto out;
 591         }
 592         if (freeing)
 593                 OCFS2_DQUOT(dquot)->dq_use_count--;
 594         err = qtree_write_dquot(&info->dqi_gi, dquot);
 595         if (err < 0)
 596                 goto out_qlock;
 597         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 598                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 599                 if (info_dirty(sb_dqinfo(sb, type))) {
 600                         err2 = __ocfs2_global_write_info(sb, type);
 601                         if (!err)
 602                                 err = err2;
 603                 }
 604         }
 605 out_qlock:
 606         ocfs2_qinfo_unlock(info, freeing);
 607 out:
 608         if (err < 0)
 609                 mlog_errno(err);
 610         return err;
 611 }
 612
 613 /*
 614  *  Functions for periodic syncing of dquots with global file
 615  */
 616 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 617 {
 618         handle_t *handle;
 619         struct super_block *sb = dquot->dq_sb;
 620         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 621         struct ocfs2_super *osb = OCFS2_SB(sb);
 622         int status = 0;
 623
 624         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 625                    dquot->dq_type, type, sb->s_id);
 626         if (type != dquot->dq_type)
 627                 goto out;
 628         status = ocfs2_lock_global_qf(oinfo, 1);
 629         if (status < 0)
 630                 goto out;
 631
 632         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 633         if (IS_ERR(handle)) {
 634                 status = PTR_ERR(handle);
 635                 mlog_errno(status);
 636                 goto out_ilock;
 637         }
 638         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 639         status = ocfs2_sync_dquot(dquot);
 640         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 641         if (status < 0)
 642                 mlog_errno(status);
 643         /* We have to write local structure as well... */
 644         dquot_mark_dquot_dirty(dquot);
 645         status = dquot_commit(dquot);
 646         if (status < 0)
 647                 mlog_errno(status);
 648         ocfs2_commit_trans(osb, handle);
 649 out_ilock:
 650         ocfs2_unlock_global_qf(oinfo, 1);
 651 out:
 652         mlog_exit(status);
 653         return status;
 654 }
 655
 656 static void qsync_work_fn(struct work_struct *work)
 657 {
 658         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 659                                                       struct ocfs2_mem_dqinfo,
 660                                                       dqi_sync_work.work);
 661         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 662
 663         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 664         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 665                            msecs_to_jiffies(oinfo->dqi_syncms));
 666 }
 667
 668 /*
 669  *  Wrappers for generic quota functions
 670  */
 671
 672 static int ocfs2_write_dquot(struct dquot *dquot)
 673 {
 674         handle_t *handle;
 675         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 676         int status = 0;
 677
 678         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 679
 680         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 681         if (IS_ERR(handle)) {
 682                 status = PTR_ERR(handle);
 683                 mlog_errno(status);
 684                 goto out;
 685         }
 686         status = dquot_commit(dquot);
 687         ocfs2_commit_trans(osb, handle);
 688 out:
 689         mlog_exit(status);
 690         return status;
 691 }
 692
 693 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 694 {
 695         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 696         /*
 697          * We modify tree, leaf block, global info, local chunk header,
 698          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
 699          * accounts for inode update
 700          */
 701         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
 702                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
 703                OCFS2_QINFO_WRITE_CREDITS +
 704                OCFS2_INODE_UPDATE_CREDITS;
 705 }
 706
 707 static int ocfs2_release_dquot(struct dquot *dquot)
 708 {
 709         handle_t *handle;
 710         struct ocfs2_mem_dqinfo *oinfo =
 711                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 712         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 713         int status = 0;
 714
 715         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 716
 717         status = ocfs2_lock_global_qf(oinfo, 1);
 718         if (status < 0)
 719                 goto out;
 720         handle = ocfs2_start_trans(osb,
 721                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 722         if (IS_ERR(handle)) {
 723                 status = PTR_ERR(handle);
 724                 mlog_errno(status);
 725                 goto out_ilock;
 726         }
 727         status = dquot_release(dquot);
 728         ocfs2_commit_trans(osb, handle);
 729 out_ilock:
 730         ocfs2_unlock_global_qf(oinfo, 1);
 731 out:
 732         mlog_exit(status);
 733         return status;
 734 }
 735
 736 static int ocfs2_acquire_dquot(struct dquot *dquot)
 737 {
 738         struct ocfs2_mem_dqinfo *oinfo =
 739                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 740         int status = 0;
 741
 742         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 743         /* We need an exclusive lock, because we're going to update use count
 744          * and instantiate possibly new dquot structure */
 745         status = ocfs2_lock_global_qf(oinfo, 1);
 746         if (status < 0)
 747                 goto out;
 748         status = dquot_acquire(dquot);
 749         ocfs2_unlock_global_qf(oinfo, 1);
 750 out:
 751         mlog_exit(status);
 752         return status;
 753 }
 754
 755 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 756 {
 757         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 758                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 759                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 760                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 761                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 762                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 763         int sync = 0;
 764         int status;
 765         struct super_block *sb = dquot->dq_sb;
 766         int type = dquot->dq_type;
 767         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 768         handle_t *handle;
 769         struct ocfs2_super *osb = OCFS2_SB(sb);
 770
 771         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 772         dquot_mark_dquot_dirty(dquot);
 773
 774         /* In case user set some limits, sync dquot immediately to global
 775          * quota file so that information propagates quicker */
 776         spin_lock(&dq_data_lock);
 777         if (dquot->dq_flags & mask)
 778                 sync = 1;
 779         spin_unlock(&dq_data_lock);
 780         /* This is a slight hack but we can't afford getting global quota
 781          * lock if we already have a transaction started. */
 782         if (!sync || journal_current_handle()) {
 783                 status = ocfs2_write_dquot(dquot);
 784                 goto out;
 785         }
 786         status = ocfs2_lock_global_qf(oinfo, 1);
 787         if (status < 0)
 788                 goto out;
 789         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 790         if (IS_ERR(handle)) {
 791                 status = PTR_ERR(handle);
 792                 mlog_errno(status);
 793                 goto out_ilock;
 794         }
 795         status = ocfs2_sync_dquot(dquot);
 796         if (status < 0) {
 797                 mlog_errno(status);
 798                 goto out_trans;
 799         }
 800         /* Now write updated local dquot structure */
 801         status = dquot_commit(dquot);
 802 out_trans:
 803         ocfs2_commit_trans(osb, handle);
 804 out_ilock:
 805         ocfs2_unlock_global_qf(oinfo, 1);
 806 out:
 807         mlog_exit(status);
 808         return status;
 809 }
 810
 811 /* This should happen only after set_dqinfo(). */
 812 static int ocfs2_write_info(struct super_block *sb, int type)
 813 {
 814         handle_t *handle;
 815         int status = 0;
 816         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 817
 818         mlog_entry_void();
 819
 820         status = ocfs2_lock_global_qf(oinfo, 1);
 821         if (status < 0)
 822                 goto out;
 823         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 824         if (IS_ERR(handle)) {
 825                 status = PTR_ERR(handle);
 826                 mlog_errno(status);
 827                 goto out_ilock;
 828         }
 829         status = dquot_commit_info(sb, type);
 830         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 831 out_ilock:
 832         ocfs2_unlock_global_qf(oinfo, 1);
 833 out:
 834         mlog_exit(status);
 835         return status;
 836 }
 837
 838 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 839 {
 840         struct ocfs2_dquot *dquot =
 841                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 842
 843         if (!dquot)
 844                 return NULL;
 845         return &dquot->dq_dquot;
 846 }
 847
 848 static void ocfs2_destroy_dquot(struct dquot *dquot)
 849 {
 850         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 851 }
 852
 853 const struct dquot_operations ocfs2_quota_operations = {
 854         .initialize     = dquot_initialize,
 855         .write_dquot    = ocfs2_write_dquot,
 856         .acquire_dquot  = ocfs2_acquire_dquot,
 857         .release_dquot  = ocfs2_release_dquot,
 858         .mark_dirty     = ocfs2_mark_dquot_dirty,
 859         .write_info     = ocfs2_write_info,
 860         .alloc_dquot    = ocfs2_alloc_dquot,
 861         .destroy_dquot  = ocfs2_destroy_dquot,
 862 };
 863
 864 int ocfs2_quota_setup(void)
 865 {
 866         ocfs2_quota_wq = create_workqueue("o2quot");
 867         if (!ocfs2_quota_wq)
 868                 return -ENOMEM;
 869         return 0;
 870 }
 871
 872 void ocfs2_quota_shutdown(void)
 873 {
 874         if (ocfs2_quota_wq) {
 875                 flush_workqueue(ocfs2_quota_wq);
 876                 destroy_workqueue(ocfs2_quota_wq);
 877                 ocfs2_quota_wq = NULL;
 878         }
 879 }