Pileus Git - ~andy/linux/blob - fs/ocfs2/quota_global.c

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