fs/ocfs2/quota_global.c

   1 /*
   2  *  Implementation of operations over global quota file
   3  */
   4 #include <linux/spinlock.h>
   5 #include <linux/fs.h>
   6 #include <linux/quota.h>
   7 #include <linux/quotaops.h>
   8 #include <linux/dqblk_qtree.h>
   9 #include <linux/jiffies.h>
  10 #include <linux/writeback.h>
  11 #include <linux/workqueue.h>
  12
  13 #define MLOG_MASK_PREFIX ML_QUOTA
  14 #include <cluster/masklog.h>
  15
  16 #include "ocfs2_fs.h"
  17 #include "ocfs2.h"
  18 #include "alloc.h"
  19 #include "inode.h"
  20 #include "journal.h"
  21 #include "file.h"
  22 #include "sysfile.h"
  23 #include "dlmglue.h"
  24 #include "uptodate.h"
  25 #include "quota.h"
  26
  27 static struct workqueue_struct *ocfs2_quota_wq = NULL;
  28
  29 static void qsync_work_fn(struct work_struct *work);
  30
  31 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
  32 {
  33         struct ocfs2_global_disk_dqblk *d = dp;
  34         struct mem_dqblk *m = &dquot->dq_dqb;
  35
  36         /* Update from disk only entries not set by the admin */
  37         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
  38                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
  39                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
  40         }
  41         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
  42                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
  43         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
  44                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
  45                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
  46         }
  47         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
  48                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
  49         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
  50                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
  51         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
  52                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
  53         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
  54 }
  55
  56 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
  57 {
  58         struct ocfs2_global_disk_dqblk *d = dp;
  59         struct mem_dqblk *m = &dquot->dq_dqb;
  60
  61         d->dqb_id = cpu_to_le32(dquot->dq_id);
  62         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
  63         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
  64         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
  65         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
  66         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
  67         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
  68         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
  69         d->dqb_btime = cpu_to_le64(m->dqb_btime);
  70         d->dqb_itime = cpu_to_le64(m->dqb_itime);
  71 }
  72
  73 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
  74 {
  75         struct ocfs2_global_disk_dqblk *d = dp;
  76         struct ocfs2_mem_dqinfo *oinfo =
  77                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
  78
  79         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
  80                 return 0;
  81         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
  82 }
  83
  84 struct qtree_fmt_operations ocfs2_global_ops = {
  85         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
  86         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
  87         .is_id = ocfs2_global_is_id,
  88 };
  89
  90 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
  91                            struct buffer_head **bh)
  92 {
  93         int rc = 0;
  94         struct buffer_head *tmp = *bh;
  95
  96         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0, NULL);
  97         if (rc)
  98                 mlog_errno(rc);
  99
 100         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
 101         if (!rc && !*bh)
 102                 *bh = tmp;
 103
 104         return rc;
 105 }
 106
 107 static int ocfs2_get_quota_block(struct inode *inode, int block,
 108                                  struct buffer_head **bh)
 109 {
 110         u64 pblock, pcount;
 111         int err;
 112
 113         down_read(&OCFS2_I(inode)->ip_alloc_sem);
 114         err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
 115         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 116         if (err) {
 117                 mlog_errno(err);
 118                 return err;
 119         }
 120         *bh = sb_getblk(inode->i_sb, pblock);
 121         if (!*bh) {
 122                 err = -EIO;
 123                 mlog_errno(err);
 124         }
 125         return err;;
 126 }
 127
 128 /* Read data from global quotafile - avoid pagecache and such because we cannot
 129  * afford acquiring the locks... We use quota cluster lock to serialize
 130  * operations. Caller is responsible for acquiring it. */
 131 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 132                          size_t len, loff_t off)
 133 {
 134         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 135         struct inode *gqinode = oinfo->dqi_gqinode;
 136         loff_t i_size = i_size_read(gqinode);
 137         int offset = off & (sb->s_blocksize - 1);
 138         sector_t blk = off >> sb->s_blocksize_bits;
 139         int err = 0;
 140         struct buffer_head *bh;
 141         size_t toread, tocopy;
 142
 143         if (off > i_size)
 144                 return 0;
 145         if (off + len > i_size)
 146                 len = i_size - off;
 147         toread = len;
 148         while (toread > 0) {
 149                 tocopy = min((size_t)(sb->s_blocksize - offset), toread);
 150                 bh = NULL;
 151                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 152                 if (err) {
 153                         mlog_errno(err);
 154                         return err;
 155                 }
 156                 memcpy(data, bh->b_data + offset, tocopy);
 157                 brelse(bh);
 158                 offset = 0;
 159                 toread -= tocopy;
 160                 data += tocopy;
 161                 blk++;
 162         }
 163         return len;
 164 }
 165
 166 /* Write to quotafile (we know the transaction is already started and has
 167  * enough credits) */
 168 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 169                           const char *data, size_t len, loff_t off)
 170 {
 171         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 172         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 173         struct inode *gqinode = oinfo->dqi_gqinode;
 174         int offset = off & (sb->s_blocksize - 1);
 175         sector_t blk = off >> sb->s_blocksize_bits;
 176         int err = 0, new = 0, ja_type;
 177         struct buffer_head *bh = NULL;
 178         handle_t *handle = journal_current_handle();
 179
 180         if (!handle) {
 181                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 182                      "because transaction was not started.\n",
 183                      (unsigned long long)off, (unsigned long long)len);
 184                 return -EIO;
 185         }
 186         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 187                 WARN_ON(1);
 188                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 189         }
 190
 191         mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
 192         if (gqinode->i_size < off + len) {
 193                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 194                 err = ocfs2_extend_no_holes(gqinode, off + len, off);
 195                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 196                 if (err < 0)
 197                         goto out;
 198                 err = ocfs2_simple_size_update(gqinode,
 199                                                oinfo->dqi_gqi_bh,
 200                                                off + len);
 201                 if (err < 0)
 202                         goto out;
 203                 new = 1;
 204         }
 205         /* Not rewriting whole block? */
 206         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 207             !new) {
 208                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 209                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
 210         } else {
 211                 err = ocfs2_get_quota_block(gqinode, blk, &bh);
 212                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
 213         }
 214         if (err) {
 215                 mlog_errno(err);
 216                 return err;
 217         }
 218         lock_buffer(bh);
 219         if (new)
 220                 memset(bh->b_data, 0, sb->s_blocksize);
 221         memcpy(bh->b_data + offset, data, len);
 222         flush_dcache_page(bh->b_page);
 223         set_buffer_uptodate(bh);
 224         unlock_buffer(bh);
 225         ocfs2_set_buffer_uptodate(gqinode, bh);
 226         err = ocfs2_journal_access(handle, gqinode, bh, ja_type);
 227         if (err < 0) {
 228                 brelse(bh);
 229                 goto out;
 230         }
 231         err = ocfs2_journal_dirty(handle, bh);
 232         brelse(bh);
 233         if (err < 0)
 234                 goto out;
 235 out:
 236         if (err) {
 237                 mutex_unlock(&gqinode->i_mutex);
 238                 mlog_errno(err);
 239                 return err;
 240         }
 241         gqinode->i_version++;
 242         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 243         mutex_unlock(&gqinode->i_mutex);
 244         return len;
 245 }
 246
 247 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 248 {
 249         int status;
 250         struct buffer_head *bh = NULL;
 251
 252         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 253         if (status < 0)
 254                 return status;
 255         spin_lock(&dq_data_lock);
 256         if (!oinfo->dqi_gqi_count++)
 257                 oinfo->dqi_gqi_bh = bh;
 258         else
 259                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 260         spin_unlock(&dq_data_lock);
 261         return 0;
 262 }
 263
 264 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 265 {
 266         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 267         brelse(oinfo->dqi_gqi_bh);
 268         spin_lock(&dq_data_lock);
 269         if (!--oinfo->dqi_gqi_count)
 270                 oinfo->dqi_gqi_bh = NULL;
 271         spin_unlock(&dq_data_lock);
 272 }
 273
 274 /* Read information header from global quota file */
 275 int ocfs2_global_read_info(struct super_block *sb, int type)
 276 {
 277         struct inode *gqinode = NULL;
 278         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 279                                         GROUP_QUOTA_SYSTEM_INODE };
 280         struct ocfs2_global_disk_dqinfo dinfo;
 281         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 282         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 283         int status;
 284
 285         mlog_entry_void();
 286
 287         /* Read global header */
 288         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 289                         OCFS2_INVALID_SLOT);
 290         if (!gqinode) {
 291                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 292                         type);
 293                 status = -EINVAL;
 294                 goto out_err;
 295         }
 296         oinfo->dqi_gi.dqi_sb = sb;
 297         oinfo->dqi_gi.dqi_type = type;
 298         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 299         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 300         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 301         oinfo->dqi_gqi_bh = NULL;
 302         oinfo->dqi_gqi_count = 0;
 303         oinfo->dqi_gqinode = gqinode;
 304         status = ocfs2_lock_global_qf(oinfo, 0);
 305         if (status < 0) {
 306                 mlog_errno(status);
 307                 goto out_err;
 308         }
 309         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 310                                       sizeof(struct ocfs2_global_disk_dqinfo),
 311                                       OCFS2_GLOBAL_INFO_OFF);
 312         ocfs2_unlock_global_qf(oinfo, 0);
 313         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 314                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 315                      status);
 316                 if (status >= 0)
 317                         status = -EIO;
 318                 mlog_errno(status);
 319                 goto out_err;
 320         }
 321         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 322         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 323         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 324         oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
 325         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 326         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 327         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 328         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 329         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 330                                                 OCFS2_QBLK_RESERVED_SPACE;
 331         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 332         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 333         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 334                            oinfo->dqi_syncjiff);
 335
 336 out_err:
 337         mlog_exit(status);
 338         return status;
 339 }
 340
 341 /* Write information to global quota file. Expects exlusive lock on quota
 342  * file inode and quota info */
 343 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 344 {
 345         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 346         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 347         struct ocfs2_global_disk_dqinfo dinfo;
 348         ssize_t size;
 349
 350         spin_lock(&dq_data_lock);
 351         info->dqi_flags &= ~DQF_INFO_DIRTY;
 352         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 353         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 354         spin_unlock(&dq_data_lock);
 355         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 356         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 357         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 358         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 359         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 360                                      sizeof(struct ocfs2_global_disk_dqinfo),
 361                                      OCFS2_GLOBAL_INFO_OFF);
 362         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 363                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 364                 if (size >= 0)
 365                         size = -EIO;
 366                 return size;
 367         }
 368         return 0;
 369 }
 370
 371 int ocfs2_global_write_info(struct super_block *sb, int type)
 372 {
 373         int err;
 374         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 375
 376         err = ocfs2_qinfo_lock(info, 1);
 377         if (err < 0)
 378                 return err;
 379         err = __ocfs2_global_write_info(sb, type);
 380         ocfs2_qinfo_unlock(info, 1);
 381         return err;
 382 }
 383
 384 /* Read in information from global quota file and acquire a reference to it.
 385  * dquot_acquire() has already started the transaction and locked quota file */
 386 int ocfs2_global_read_dquot(struct dquot *dquot)
 387 {
 388         int err, err2, ex = 0;
 389         struct ocfs2_mem_dqinfo *info =
 390                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 391
 392         err = ocfs2_qinfo_lock(info, 0);
 393         if (err < 0)
 394                 goto out;
 395         err = qtree_read_dquot(&info->dqi_gi, dquot);
 396         if (err < 0)
 397                 goto out_qlock;
 398         OCFS2_DQUOT(dquot)->dq_use_count++;
 399         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 400         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 401         if (!dquot->dq_off) {   /* No real quota entry? */
 402                 /* Upgrade to exclusive lock for allocation */
 403                 err = ocfs2_qinfo_lock(info, 1);
 404                 if (err < 0)
 405                         goto out_qlock;
 406                 ex = 1;
 407         }
 408         err = qtree_write_dquot(&info->dqi_gi, dquot);
 409         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
 410                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
 411                 if (!err)
 412                         err = err2;
 413         }
 414 out_qlock:
 415         if (ex)
 416                 ocfs2_qinfo_unlock(info, 1);
 417         ocfs2_qinfo_unlock(info, 0);
 418 out:
 419         if (err < 0)
 420                 mlog_errno(err);
 421         return err;
 422 }
 423
 424 /* Sync local information about quota modifications with global quota file.
 425  * Caller must have started the transaction and obtained exclusive lock for
 426  * global quota file inode */
 427 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 428 {
 429         int err, err2;
 430         struct super_block *sb = dquot->dq_sb;
 431         int type = dquot->dq_type;
 432         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 433         struct ocfs2_global_disk_dqblk dqblk;
 434         s64 spacechange, inodechange;
 435         time_t olditime, oldbtime;
 436
 437         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 438                                    sizeof(struct ocfs2_global_disk_dqblk),
 439                                    dquot->dq_off);
 440         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 441                 if (err >= 0) {
 442                         mlog(ML_ERROR, "Short read from global quota file "
 443                                        "(%u read)\n", err);
 444                         err = -EIO;
 445                 }
 446                 goto out;
 447         }
 448
 449         /* Update space and inode usage. Get also other information from
 450          * global quota file so that we don't overwrite any changes there.
 451          * We are */
 452         spin_lock(&dq_data_lock);
 453         spacechange = dquot->dq_dqb.dqb_curspace -
 454                                         OCFS2_DQUOT(dquot)->dq_origspace;
 455         inodechange = dquot->dq_dqb.dqb_curinodes -
 456                                         OCFS2_DQUOT(dquot)->dq_originodes;
 457         olditime = dquot->dq_dqb.dqb_itime;
 458         oldbtime = dquot->dq_dqb.dqb_btime;
 459         ocfs2_global_disk2memdqb(dquot, &dqblk);
 460         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
 461              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
 462              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
 463         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 464                 dquot->dq_dqb.dqb_curspace += spacechange;
 465         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 466                 dquot->dq_dqb.dqb_curinodes += inodechange;
 467         /* Set properly space grace time... */
 468         if (dquot->dq_dqb.dqb_bsoftlimit &&
 469             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 470                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 471                     oldbtime > 0) {
 472                         if (dquot->dq_dqb.dqb_btime > 0)
 473                                 dquot->dq_dqb.dqb_btime =
 474                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 475                         else
 476                                 dquot->dq_dqb.dqb_btime = oldbtime;
 477                 }
 478         } else {
 479                 dquot->dq_dqb.dqb_btime = 0;
 480                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 481         }
 482         /* Set properly inode grace time... */
 483         if (dquot->dq_dqb.dqb_isoftlimit &&
 484             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 485                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 486                     olditime > 0) {
 487                         if (dquot->dq_dqb.dqb_itime > 0)
 488                                 dquot->dq_dqb.dqb_itime =
 489                                         min(dquot->dq_dqb.dqb_itime, olditime);
 490                         else
 491                                 dquot->dq_dqb.dqb_itime = olditime;
 492                 }
 493         } else {
 494                 dquot->dq_dqb.dqb_itime = 0;
 495                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 496         }
 497         /* All information is properly updated, clear the flags */
 498         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 499         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 500         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 501         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 502         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 503         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 504         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 505         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 506         spin_unlock(&dq_data_lock);
 507         err = ocfs2_qinfo_lock(info, freeing);
 508         if (err < 0) {
 509                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 510                                " (type=%d, id=%u)\n", dquot->dq_type,
 511                                (unsigned)dquot->dq_id);
 512                 goto out;
 513         }
 514         if (freeing)
 515                 OCFS2_DQUOT(dquot)->dq_use_count--;
 516         err = qtree_write_dquot(&info->dqi_gi, dquot);
 517         if (err < 0)
 518                 goto out_qlock;
 519         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 520                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 521                 if (info_dirty(sb_dqinfo(sb, type))) {
 522                         err2 = __ocfs2_global_write_info(sb, type);
 523                         if (!err)
 524                                 err = err2;
 525                 }
 526         }
 527 out_qlock:
 528         ocfs2_qinfo_unlock(info, freeing);
 529 out:
 530         if (err < 0)
 531                 mlog_errno(err);
 532         return err;
 533 }
 534
 535 /*
 536  *  Functions for periodic syncing of dquots with global file
 537  */
 538 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 539 {
 540         handle_t *handle;
 541         struct super_block *sb = dquot->dq_sb;
 542         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 543         struct ocfs2_super *osb = OCFS2_SB(sb);
 544         int status = 0;
 545
 546         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 547                    dquot->dq_type, type, sb->s_id);
 548         if (type != dquot->dq_type)
 549                 goto out;
 550         status = ocfs2_lock_global_qf(oinfo, 1);
 551         if (status < 0)
 552                 goto out;
 553
 554         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 555         if (IS_ERR(handle)) {
 556                 status = PTR_ERR(handle);
 557                 mlog_errno(status);
 558                 goto out_ilock;
 559         }
 560         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 561         status = ocfs2_sync_dquot(dquot);
 562         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 563         if (status < 0)
 564                 mlog_errno(status);
 565         /* We have to write local structure as well... */
 566         dquot_mark_dquot_dirty(dquot);
 567         status = dquot_commit(dquot);
 568         if (status < 0)
 569                 mlog_errno(status);
 570         ocfs2_commit_trans(osb, handle);
 571 out_ilock:
 572         ocfs2_unlock_global_qf(oinfo, 1);
 573 out:
 574         mlog_exit(status);
 575         return status;
 576 }
 577
 578 static void qsync_work_fn(struct work_struct *work)
 579 {
 580         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 581                                                       struct ocfs2_mem_dqinfo,
 582                                                       dqi_sync_work.work);
 583         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 584
 585         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 586         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 587                            oinfo->dqi_syncjiff);
 588 }
 589
 590 /*
 591  *  Wrappers for generic quota functions
 592  */
 593
 594 static int ocfs2_write_dquot(struct dquot *dquot)
 595 {
 596         handle_t *handle;
 597         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 598         int status = 0;
 599
 600         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 601
 602         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 603         if (IS_ERR(handle)) {
 604                 status = PTR_ERR(handle);
 605                 mlog_errno(status);
 606                 goto out;
 607         }
 608         status = dquot_commit(dquot);
 609         ocfs2_commit_trans(osb, handle);
 610 out:
 611         mlog_exit(status);
 612         return status;
 613 }
 614
 615 int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 616 {
 617         struct ocfs2_mem_dqinfo *oinfo;
 618         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 619                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
 620
 621         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
 622                 return 0;
 623
 624         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 625         /* We modify tree, leaf block, global info, local chunk header,
 626          * global and local inode */
 627         return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
 628                2 * OCFS2_INODE_UPDATE_CREDITS;
 629 }
 630
 631 static int ocfs2_release_dquot(struct dquot *dquot)
 632 {
 633         handle_t *handle;
 634         struct ocfs2_mem_dqinfo *oinfo =
 635                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 636         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 637         int status = 0;
 638
 639         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 640
 641         status = ocfs2_lock_global_qf(oinfo, 1);
 642         if (status < 0)
 643                 goto out;
 644         handle = ocfs2_start_trans(osb,
 645                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 646         if (IS_ERR(handle)) {
 647                 status = PTR_ERR(handle);
 648                 mlog_errno(status);
 649                 goto out_ilock;
 650         }
 651         status = dquot_release(dquot);
 652         ocfs2_commit_trans(osb, handle);
 653 out_ilock:
 654         ocfs2_unlock_global_qf(oinfo, 1);
 655 out:
 656         mlog_exit(status);
 657         return status;
 658 }
 659
 660 int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
 661 {
 662         struct ocfs2_mem_dqinfo *oinfo;
 663         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 664                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
 665         struct ocfs2_dinode *lfe, *gfe;
 666
 667         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
 668                 return 0;
 669
 670         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 671         gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
 672         lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
 673         /* We can extend local file + global file. In local file we
 674          * can modify info, chunk header block and dquot block. In
 675          * global file we can modify info, tree and leaf block */
 676         return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
 677                ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
 678                3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
 679 }
 680
 681 static int ocfs2_acquire_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_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 690         /* We need an exclusive lock, because we're going to update use count
 691          * and instantiate possibly new dquot structure */
 692         status = ocfs2_lock_global_qf(oinfo, 1);
 693         if (status < 0)
 694                 goto out;
 695         handle = ocfs2_start_trans(osb,
 696                 ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
 697         if (IS_ERR(handle)) {
 698                 status = PTR_ERR(handle);
 699                 mlog_errno(status);
 700                 goto out_ilock;
 701         }
 702         status = dquot_acquire(dquot);
 703         ocfs2_commit_trans(osb, handle);
 704 out_ilock:
 705         ocfs2_unlock_global_qf(oinfo, 1);
 706 out:
 707         mlog_exit(status);
 708         return status;
 709 }
 710
 711 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 712 {
 713         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 714                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 715                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 716                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 717                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 718                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 719         int sync = 0;
 720         int status;
 721         struct super_block *sb = dquot->dq_sb;
 722         int type = dquot->dq_type;
 723         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 724         handle_t *handle;
 725         struct ocfs2_super *osb = OCFS2_SB(sb);
 726
 727         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 728         dquot_mark_dquot_dirty(dquot);
 729
 730         /* In case user set some limits, sync dquot immediately to global
 731          * quota file so that information propagates quicker */
 732         spin_lock(&dq_data_lock);
 733         if (dquot->dq_flags & mask)
 734                 sync = 1;
 735         spin_unlock(&dq_data_lock);
 736         if (!sync) {
 737                 status = ocfs2_write_dquot(dquot);
 738                 goto out;
 739         }
 740         status = ocfs2_lock_global_qf(oinfo, 1);
 741         if (status < 0)
 742                 goto out;
 743         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 744         if (IS_ERR(handle)) {
 745                 status = PTR_ERR(handle);
 746                 mlog_errno(status);
 747                 goto out_ilock;
 748         }
 749         status = ocfs2_sync_dquot(dquot);
 750         if (status < 0) {
 751                 mlog_errno(status);
 752                 goto out_trans;
 753         }
 754         /* Now write updated local dquot structure */
 755         status = dquot_commit(dquot);
 756 out_trans:
 757         ocfs2_commit_trans(osb, handle);
 758 out_ilock:
 759         ocfs2_unlock_global_qf(oinfo, 1);
 760 out:
 761         mlog_exit(status);
 762         return status;
 763 }
 764
 765 /* This should happen only after set_dqinfo(). */
 766 static int ocfs2_write_info(struct super_block *sb, int type)
 767 {
 768         handle_t *handle;
 769         int status = 0;
 770         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 771
 772         mlog_entry_void();
 773
 774         status = ocfs2_lock_global_qf(oinfo, 1);
 775         if (status < 0)
 776                 goto out;
 777         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 778         if (IS_ERR(handle)) {
 779                 status = PTR_ERR(handle);
 780                 mlog_errno(status);
 781                 goto out_ilock;
 782         }
 783         status = dquot_commit_info(sb, type);
 784         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 785 out_ilock:
 786         ocfs2_unlock_global_qf(oinfo, 1);
 787 out:
 788         mlog_exit(status);
 789         return status;
 790 }
 791
 792 /* This is difficult. We have to lock quota inode and start transaction
 793  * in this function but we don't want to take the penalty of exlusive
 794  * quota file lock when we are just going to use cached structures. So
 795  * we just take read lock check whether we have dquot cached and if so,
 796  * we don't have to take the write lock... */
 797 static int ocfs2_dquot_initialize(struct inode *inode, int type)
 798 {
 799         handle_t *handle = NULL;
 800         int status = 0;
 801         struct super_block *sb = inode->i_sb;
 802         struct ocfs2_mem_dqinfo *oinfo;
 803         int exclusive = 0;
 804         int cnt;
 805         qid_t id;
 806
 807         mlog_entry_void();
 808
 809         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 810                 if (type != -1 && cnt != type)
 811                         continue;
 812                 if (!sb_has_quota_active(sb, cnt))
 813                         continue;
 814                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 815                 status = ocfs2_lock_global_qf(oinfo, 0);
 816                 if (status < 0)
 817                         goto out;
 818                 /* This is just a performance optimization not a reliable test.
 819                  * Since we hold an inode lock, noone can actually release
 820                  * the structure until we are finished with initialization. */
 821                 if (inode->i_dquot[cnt] != NODQUOT) {
 822                         ocfs2_unlock_global_qf(oinfo, 0);
 823                         continue;
 824                 }
 825                 /* When we have inode lock, we know that no dquot_release() can
 826                  * run and thus we can safely check whether we need to
 827                  * read+modify global file to get quota information or whether
 828                  * our node already has it. */
 829                 if (cnt == USRQUOTA)
 830                         id = inode->i_uid;
 831                 else if (cnt == GRPQUOTA)
 832                         id = inode->i_gid;
 833                 else
 834                         BUG();
 835                 /* Obtain exclusion from quota off... */
 836                 down_write(&sb_dqopt(sb)->dqptr_sem);
 837                 exclusive = !dquot_is_cached(sb, id, cnt);
 838                 up_write(&sb_dqopt(sb)->dqptr_sem);
 839                 if (exclusive) {
 840                         status = ocfs2_lock_global_qf(oinfo, 1);
 841                         if (status < 0) {
 842                                 exclusive = 0;
 843                                 mlog_errno(status);
 844                                 goto out_ilock;
 845                         }
 846                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 847                                         ocfs2_calc_qinit_credits(sb, cnt));
 848                         if (IS_ERR(handle)) {
 849                                 status = PTR_ERR(handle);
 850                                 mlog_errno(status);
 851                                 goto out_ilock;
 852                         }
 853                 }
 854                 dquot_initialize(inode, cnt);
 855                 if (exclusive) {
 856                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 857                         ocfs2_unlock_global_qf(oinfo, 1);
 858                 }
 859                 ocfs2_unlock_global_qf(oinfo, 0);
 860         }
 861         mlog_exit(0);
 862         return 0;
 863 out_ilock:
 864         if (exclusive)
 865                 ocfs2_unlock_global_qf(oinfo, 1);
 866         ocfs2_unlock_global_qf(oinfo, 0);
 867 out:
 868         mlog_exit(status);
 869         return status;
 870 }
 871
 872 static int ocfs2_dquot_drop_slow(struct inode *inode)
 873 {
 874         int status = 0;
 875         int cnt;
 876         int got_lock[MAXQUOTAS] = {0, 0};
 877         handle_t *handle;
 878         struct super_block *sb = inode->i_sb;
 879         struct ocfs2_mem_dqinfo *oinfo;
 880
 881         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 882                 if (!sb_has_quota_active(sb, cnt))
 883                         continue;
 884                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 885                 status = ocfs2_lock_global_qf(oinfo, 1);
 886                 if (status < 0)
 887                         goto out;
 888                 got_lock[cnt] = 1;
 889         }
 890         handle = ocfs2_start_trans(OCFS2_SB(sb),
 891                         ocfs2_calc_qinit_credits(sb, USRQUOTA) +
 892                         ocfs2_calc_qinit_credits(sb, GRPQUOTA));
 893         if (IS_ERR(handle)) {
 894                 status = PTR_ERR(handle);
 895                 mlog_errno(status);
 896                                 goto out;
 897         }
 898         dquot_drop(inode);
 899         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 900 out:
 901         for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 902                 if (got_lock[cnt]) {
 903                         oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 904                         ocfs2_unlock_global_qf(oinfo, 1);
 905                 }
 906         return status;
 907 }
 908
 909 /* See the comment before ocfs2_dquot_initialize. */
 910 static int ocfs2_dquot_drop(struct inode *inode)
 911 {
 912         int status = 0;
 913         struct super_block *sb = inode->i_sb;
 914         struct ocfs2_mem_dqinfo *oinfo;
 915         int exclusive = 0;
 916         int cnt;
 917         int got_lock[MAXQUOTAS] = {0, 0};
 918
 919         mlog_entry_void();
 920         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 921                 if (!sb_has_quota_active(sb, cnt))
 922                         continue;
 923                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 924                 status = ocfs2_lock_global_qf(oinfo, 0);
 925                 if (status < 0)
 926                         goto out;
 927                 got_lock[cnt] = 1;
 928         }
 929         /* Lock against anyone releasing references so that when when we check
 930          * we know we are not going to be last ones to release dquot */
 931         down_write(&sb_dqopt(sb)->dqptr_sem);
 932         /* Urgh, this is a terrible hack :( */
 933         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 934                 if (inode->i_dquot[cnt] != NODQUOT &&
 935                     atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
 936                         exclusive = 1;
 937                         break;
 938                 }
 939         }
 940         if (!exclusive)
 941                 dquot_drop_locked(inode);
 942         up_write(&sb_dqopt(sb)->dqptr_sem);
 943 out:
 944         for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 945                 if (got_lock[cnt]) {
 946                         oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 947                         ocfs2_unlock_global_qf(oinfo, 0);
 948                 }
 949         /* In case we bailed out because we had to do expensive locking
 950          * do it now... */
 951         if (exclusive)
 952                 status = ocfs2_dquot_drop_slow(inode);
 953         mlog_exit(status);
 954         return status;
 955 }
 956
 957 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 958 {
 959         struct ocfs2_dquot *dquot =
 960                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 961
 962         if (!dquot)
 963                 return NULL;
 964         return &dquot->dq_dquot;
 965 }
 966
 967 static void ocfs2_destroy_dquot(struct dquot *dquot)
 968 {
 969         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 970 }
 971
 972 struct dquot_operations ocfs2_quota_operations = {
 973         .initialize     = ocfs2_dquot_initialize,
 974         .drop           = ocfs2_dquot_drop,
 975         .alloc_space    = dquot_alloc_space,
 976         .alloc_inode    = dquot_alloc_inode,
 977         .free_space     = dquot_free_space,
 978         .free_inode     = dquot_free_inode,
 979         .transfer       = dquot_transfer,
 980         .write_dquot    = ocfs2_write_dquot,
 981         .acquire_dquot  = ocfs2_acquire_dquot,
 982         .release_dquot  = ocfs2_release_dquot,
 983         .mark_dirty     = ocfs2_mark_dquot_dirty,
 984         .write_info     = ocfs2_write_info,
 985         .alloc_dquot    = ocfs2_alloc_dquot,
 986         .destroy_dquot  = ocfs2_destroy_dquot,
 987 };
 988
 989 int ocfs2_quota_setup(void)
 990 {
 991         ocfs2_quota_wq = create_workqueue("o2quot");
 992         if (!ocfs2_quota_wq)
 993                 return -ENOMEM;
 994         return 0;
 995 }
 996
 997 void ocfs2_quota_shutdown(void)
 998 {
 999         if (ocfs2_quota_wq) {
1000                 flush_workqueue(ocfs2_quota_wq);
1001                 destroy_workqueue(ocfs2_quota_wq);
1002                 ocfs2_quota_wq = NULL;
1003         }
1004 }