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 struct buffer_head *ocfs2_get_quota_block(struct inode *inode,
 108                                                  int block, int *err)
 109 {
 110         u64 pblock, pcount;
 111         struct buffer_head *bh;
 112
 113         down_read(&OCFS2_I(inode)->ip_alloc_sem);
 114         *err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount,
 115                                            NULL);
 116         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 117         if (*err) {
 118                 mlog_errno(*err);
 119                 return NULL;
 120         }
 121         bh = sb_getblk(inode->i_sb, pblock);
 122         if (!bh) {
 123                 *err = -EIO;
 124                 mlog_errno(*err);
 125         }
 126         return bh;
 127 }
 128
 129 /* Read data from global quotafile - avoid pagecache and such because we cannot
 130  * afford acquiring the locks... We use quota cluster lock to serialize
 131  * operations. Caller is responsible for acquiring it. */
 132 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 133                          size_t len, loff_t off)
 134 {
 135         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 136         struct inode *gqinode = oinfo->dqi_gqinode;
 137         loff_t i_size = i_size_read(gqinode);
 138         int offset = off & (sb->s_blocksize - 1);
 139         sector_t blk = off >> sb->s_blocksize_bits;
 140         int err = 0;
 141         struct buffer_head *bh;
 142         size_t toread, tocopy;
 143
 144         if (off > i_size)
 145                 return 0;
 146         if (off + len > i_size)
 147                 len = i_size - off;
 148         toread = len;
 149         while (toread > 0) {
 150                 tocopy = min((size_t)(sb->s_blocksize - offset), toread);
 151                 bh = NULL;
 152                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 153                 if (err) {
 154                         mlog_errno(err);
 155                         return err;
 156                 }
 157                 memcpy(data, bh->b_data + offset, tocopy);
 158                 brelse(bh);
 159                 offset = 0;
 160                 toread -= tocopy;
 161                 data += tocopy;
 162                 blk++;
 163         }
 164         return len;
 165 }
 166
 167 /* Write to quotafile (we know the transaction is already started and has
 168  * enough credits) */
 169 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 170                           const char *data, size_t len, loff_t off)
 171 {
 172         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 173         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 174         struct inode *gqinode = oinfo->dqi_gqinode;
 175         int offset = off & (sb->s_blocksize - 1);
 176         sector_t blk = off >> sb->s_blocksize_bits;
 177         int err = 0, new = 0;
 178         struct buffer_head *bh = NULL;
 179         handle_t *handle = journal_current_handle();
 180
 181         if (!handle) {
 182                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 183                      "because transaction was not started.\n",
 184                      (unsigned long long)off, (unsigned long long)len);
 185                 return -EIO;
 186         }
 187         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 188                 WARN_ON(1);
 189                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 190         }
 191
 192         mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
 193         if (gqinode->i_size < off + len) {
 194                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 195                 err = ocfs2_extend_no_holes(gqinode, off + len, off);
 196                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
 197                 if (err < 0)
 198                         goto out;
 199                 err = ocfs2_simple_size_update(gqinode,
 200                                                oinfo->dqi_gqi_bh,
 201                                                off + len);
 202                 if (err < 0)
 203                         goto out;
 204                 new = 1;
 205         }
 206         /* Not rewriting whole block? */
 207         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 208             !new) {
 209                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
 210                 if (err) {
 211                         mlog_errno(err);
 212                         return err;
 213                 }
 214                 err = ocfs2_journal_access(handle, gqinode, bh,
 215                                            OCFS2_JOURNAL_ACCESS_WRITE);
 216         } else {
 217                 bh = ocfs2_get_quota_block(gqinode, blk, &err);
 218                 if (!bh) {
 219                         mlog_errno(err);
 220                         return err;
 221                 }
 222                 err = ocfs2_journal_access(handle, gqinode, bh,
 223                                            OCFS2_JOURNAL_ACCESS_CREATE);
 224         }
 225         if (err < 0) {
 226                 brelse(bh);
 227                 goto out;
 228         }
 229         lock_buffer(bh);
 230         if (new)
 231                 memset(bh->b_data, 0, sb->s_blocksize);
 232         memcpy(bh->b_data + offset, data, len);
 233         flush_dcache_page(bh->b_page);
 234         unlock_buffer(bh);
 235         ocfs2_set_buffer_uptodate(gqinode, bh);
 236         err = ocfs2_journal_dirty(handle, bh);
 237         brelse(bh);
 238         if (err < 0)
 239                 goto out;
 240 out:
 241         if (err) {
 242                 mutex_unlock(&gqinode->i_mutex);
 243                 mlog_errno(err);
 244                 return err;
 245         }
 246         gqinode->i_version++;
 247         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 248         mutex_unlock(&gqinode->i_mutex);
 249         return len;
 250 }
 251
 252 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 253 {
 254         int status;
 255         struct buffer_head *bh = NULL;
 256
 257         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 258         if (status < 0)
 259                 return status;
 260         spin_lock(&dq_data_lock);
 261         if (!oinfo->dqi_gqi_count++)
 262                 oinfo->dqi_gqi_bh = bh;
 263         else
 264                 WARN_ON(bh != oinfo->dqi_gqi_bh);
 265         spin_unlock(&dq_data_lock);
 266         return 0;
 267 }
 268
 269 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 270 {
 271         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 272         brelse(oinfo->dqi_gqi_bh);
 273         spin_lock(&dq_data_lock);
 274         if (!--oinfo->dqi_gqi_count)
 275                 oinfo->dqi_gqi_bh = NULL;
 276         spin_unlock(&dq_data_lock);
 277 }
 278
 279 /* Read information header from global quota file */
 280 int ocfs2_global_read_info(struct super_block *sb, int type)
 281 {
 282         struct inode *gqinode = NULL;
 283         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 284                                         GROUP_QUOTA_SYSTEM_INODE };
 285         struct ocfs2_global_disk_dqinfo dinfo;
 286         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 287         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 288         int status;
 289
 290         mlog_entry_void();
 291
 292         /* Read global header */
 293         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 294                         OCFS2_INVALID_SLOT);
 295         if (!gqinode) {
 296                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 297                         type);
 298                 status = -EINVAL;
 299                 goto out_err;
 300         }
 301         oinfo->dqi_gi.dqi_sb = sb;
 302         oinfo->dqi_gi.dqi_type = type;
 303         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 304         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 305         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 306         oinfo->dqi_gqi_bh = NULL;
 307         oinfo->dqi_gqi_count = 0;
 308         oinfo->dqi_gqinode = gqinode;
 309         status = ocfs2_lock_global_qf(oinfo, 0);
 310         if (status < 0) {
 311                 mlog_errno(status);
 312                 goto out_err;
 313         }
 314         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 315                                       sizeof(struct ocfs2_global_disk_dqinfo),
 316                                       OCFS2_GLOBAL_INFO_OFF);
 317         ocfs2_unlock_global_qf(oinfo, 0);
 318         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 319                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 320                      status);
 321                 if (status >= 0)
 322                         status = -EIO;
 323                 mlog_errno(status);
 324                 goto out_err;
 325         }
 326         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 327         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 328         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 329         oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
 330         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 331         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 332         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 333         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 334         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 335                                                 OCFS2_QBLK_RESERVED_SPACE;
 336         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 337         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 338         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 339                            oinfo->dqi_syncjiff);
 340
 341 out_err:
 342         mlog_exit(status);
 343         return status;
 344 }
 345
 346 /* Write information to global quota file. Expects exlusive lock on quota
 347  * file inode and quota info */
 348 static int __ocfs2_global_write_info(struct super_block *sb, int type)
 349 {
 350         struct mem_dqinfo *info = sb_dqinfo(sb, type);
 351         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 352         struct ocfs2_global_disk_dqinfo dinfo;
 353         ssize_t size;
 354
 355         spin_lock(&dq_data_lock);
 356         info->dqi_flags &= ~DQF_INFO_DIRTY;
 357         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 358         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 359         spin_unlock(&dq_data_lock);
 360         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 361         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 362         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 363         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 364         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 365                                      sizeof(struct ocfs2_global_disk_dqinfo),
 366                                      OCFS2_GLOBAL_INFO_OFF);
 367         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 368                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
 369                 if (size >= 0)
 370                         size = -EIO;
 371                 return size;
 372         }
 373         return 0;
 374 }
 375
 376 int ocfs2_global_write_info(struct super_block *sb, int type)
 377 {
 378         int err;
 379         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 380
 381         err = ocfs2_qinfo_lock(info, 1);
 382         if (err < 0)
 383                 return err;
 384         err = __ocfs2_global_write_info(sb, type);
 385         ocfs2_qinfo_unlock(info, 1);
 386         return err;
 387 }
 388
 389 /* Read in information from global quota file and acquire a reference to it.
 390  * dquot_acquire() has already started the transaction and locked quota file */
 391 int ocfs2_global_read_dquot(struct dquot *dquot)
 392 {
 393         int err, err2, ex = 0;
 394         struct ocfs2_mem_dqinfo *info =
 395                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 396
 397         err = ocfs2_qinfo_lock(info, 0);
 398         if (err < 0)
 399                 goto out;
 400         err = qtree_read_dquot(&info->dqi_gi, dquot);
 401         if (err < 0)
 402                 goto out_qlock;
 403         OCFS2_DQUOT(dquot)->dq_use_count++;
 404         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 405         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 406         if (!dquot->dq_off) {   /* No real quota entry? */
 407                 /* Upgrade to exclusive lock for allocation */
 408                 err = ocfs2_qinfo_lock(info, 1);
 409                 if (err < 0)
 410                         goto out_qlock;
 411                 ex = 1;
 412         }
 413         err = qtree_write_dquot(&info->dqi_gi, dquot);
 414         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
 415                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
 416                 if (!err)
 417                         err = err2;
 418         }
 419 out_qlock:
 420         if (ex)
 421                 ocfs2_qinfo_unlock(info, 1);
 422         ocfs2_qinfo_unlock(info, 0);
 423 out:
 424         if (err < 0)
 425                 mlog_errno(err);
 426         return err;
 427 }
 428
 429 /* Sync local information about quota modifications with global quota file.
 430  * Caller must have started the transaction and obtained exclusive lock for
 431  * global quota file inode */
 432 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 433 {
 434         int err, err2;
 435         struct super_block *sb = dquot->dq_sb;
 436         int type = dquot->dq_type;
 437         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 438         struct ocfs2_global_disk_dqblk dqblk;
 439         s64 spacechange, inodechange;
 440         time_t olditime, oldbtime;
 441
 442         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 443                                    sizeof(struct ocfs2_global_disk_dqblk),
 444                                    dquot->dq_off);
 445         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 446                 if (err >= 0) {
 447                         mlog(ML_ERROR, "Short read from global quota file "
 448                                        "(%u read)\n", err);
 449                         err = -EIO;
 450                 }
 451                 goto out;
 452         }
 453
 454         /* Update space and inode usage. Get also other information from
 455          * global quota file so that we don't overwrite any changes there.
 456          * We are */
 457         spin_lock(&dq_data_lock);
 458         spacechange = dquot->dq_dqb.dqb_curspace -
 459                                         OCFS2_DQUOT(dquot)->dq_origspace;
 460         inodechange = dquot->dq_dqb.dqb_curinodes -
 461                                         OCFS2_DQUOT(dquot)->dq_originodes;
 462         olditime = dquot->dq_dqb.dqb_itime;
 463         oldbtime = dquot->dq_dqb.dqb_btime;
 464         ocfs2_global_disk2memdqb(dquot, &dqblk);
 465         mlog(0, "Syncing global dquot %d space %lld+%lld, inodes %lld+%lld\n",
 466              dquot->dq_id, dquot->dq_dqb.dqb_curspace, spacechange,
 467              dquot->dq_dqb.dqb_curinodes, inodechange);
 468         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 469                 dquot->dq_dqb.dqb_curspace += spacechange;
 470         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 471                 dquot->dq_dqb.dqb_curinodes += inodechange;
 472         /* Set properly space grace time... */
 473         if (dquot->dq_dqb.dqb_bsoftlimit &&
 474             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 475                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 476                     oldbtime > 0) {
 477                         if (dquot->dq_dqb.dqb_btime > 0)
 478                                 dquot->dq_dqb.dqb_btime =
 479                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
 480                         else
 481                                 dquot->dq_dqb.dqb_btime = oldbtime;
 482                 }
 483         } else {
 484                 dquot->dq_dqb.dqb_btime = 0;
 485                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 486         }
 487         /* Set properly inode grace time... */
 488         if (dquot->dq_dqb.dqb_isoftlimit &&
 489             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 490                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 491                     olditime > 0) {
 492                         if (dquot->dq_dqb.dqb_itime > 0)
 493                                 dquot->dq_dqb.dqb_itime =
 494                                         min(dquot->dq_dqb.dqb_itime, olditime);
 495                         else
 496                                 dquot->dq_dqb.dqb_itime = olditime;
 497                 }
 498         } else {
 499                 dquot->dq_dqb.dqb_itime = 0;
 500                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
 501         }
 502         /* All information is properly updated, clear the flags */
 503         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 504         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 505         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 506         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 507         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 508         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 509         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 510         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 511         spin_unlock(&dq_data_lock);
 512         err = ocfs2_qinfo_lock(info, freeing);
 513         if (err < 0) {
 514                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
 515                                " (type=%d, id=%u)\n", dquot->dq_type,
 516                                (unsigned)dquot->dq_id);
 517                 goto out;
 518         }
 519         if (freeing)
 520                 OCFS2_DQUOT(dquot)->dq_use_count--;
 521         err = qtree_write_dquot(&info->dqi_gi, dquot);
 522         if (err < 0)
 523                 goto out_qlock;
 524         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 525                 err = qtree_release_dquot(&info->dqi_gi, dquot);
 526                 if (info_dirty(sb_dqinfo(sb, type))) {
 527                         err2 = __ocfs2_global_write_info(sb, type);
 528                         if (!err)
 529                                 err = err2;
 530                 }
 531         }
 532 out_qlock:
 533         ocfs2_qinfo_unlock(info, freeing);
 534 out:
 535         if (err < 0)
 536                 mlog_errno(err);
 537         return err;
 538 }
 539
 540 /*
 541  *  Functions for periodic syncing of dquots with global file
 542  */
 543 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 544 {
 545         handle_t *handle;
 546         struct super_block *sb = dquot->dq_sb;
 547         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 548         struct ocfs2_super *osb = OCFS2_SB(sb);
 549         int status = 0;
 550
 551         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
 552                    dquot->dq_type, type, sb->s_id);
 553         if (type != dquot->dq_type)
 554                 goto out;
 555         status = ocfs2_lock_global_qf(oinfo, 1);
 556         if (status < 0)
 557                 goto out;
 558
 559         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 560         if (IS_ERR(handle)) {
 561                 status = PTR_ERR(handle);
 562                 mlog_errno(status);
 563                 goto out_ilock;
 564         }
 565         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 566         status = ocfs2_sync_dquot(dquot);
 567         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 568         if (status < 0)
 569                 mlog_errno(status);
 570         /* We have to write local structure as well... */
 571         dquot_mark_dquot_dirty(dquot);
 572         status = dquot_commit(dquot);
 573         if (status < 0)
 574                 mlog_errno(status);
 575         ocfs2_commit_trans(osb, handle);
 576 out_ilock:
 577         ocfs2_unlock_global_qf(oinfo, 1);
 578 out:
 579         mlog_exit(status);
 580         return status;
 581 }
 582
 583 static void qsync_work_fn(struct work_struct *work)
 584 {
 585         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 586                                                       struct ocfs2_mem_dqinfo,
 587                                                       dqi_sync_work.work);
 588         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 589
 590         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 591         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
 592                            oinfo->dqi_syncjiff);
 593 }
 594
 595 /*
 596  *  Wrappers for generic quota functions
 597  */
 598
 599 static int ocfs2_write_dquot(struct dquot *dquot)
 600 {
 601         handle_t *handle;
 602         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 603         int status = 0;
 604
 605         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 606
 607         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 608         if (IS_ERR(handle)) {
 609                 status = PTR_ERR(handle);
 610                 mlog_errno(status);
 611                 goto out;
 612         }
 613         status = dquot_commit(dquot);
 614         ocfs2_commit_trans(osb, handle);
 615 out:
 616         mlog_exit(status);
 617         return status;
 618 }
 619
 620 int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 621 {
 622         struct ocfs2_mem_dqinfo *oinfo;
 623         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 624                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
 625
 626         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
 627                 return 0;
 628
 629         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 630         /* We modify tree, leaf block, global info, local chunk header,
 631          * global and local inode */
 632         return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
 633                2 * OCFS2_INODE_UPDATE_CREDITS;
 634 }
 635
 636 static int ocfs2_release_dquot(struct dquot *dquot)
 637 {
 638         handle_t *handle;
 639         struct ocfs2_mem_dqinfo *oinfo =
 640                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 641         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 642         int status = 0;
 643
 644         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 645
 646         status = ocfs2_lock_global_qf(oinfo, 1);
 647         if (status < 0)
 648                 goto out;
 649         handle = ocfs2_start_trans(osb,
 650                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
 651         if (IS_ERR(handle)) {
 652                 status = PTR_ERR(handle);
 653                 mlog_errno(status);
 654                 goto out_ilock;
 655         }
 656         status = dquot_release(dquot);
 657         ocfs2_commit_trans(osb, handle);
 658 out_ilock:
 659         ocfs2_unlock_global_qf(oinfo, 1);
 660 out:
 661         mlog_exit(status);
 662         return status;
 663 }
 664
 665 int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
 666 {
 667         struct ocfs2_mem_dqinfo *oinfo;
 668         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 669                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
 670         struct ocfs2_dinode *lfe, *gfe;
 671
 672         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
 673                 return 0;
 674
 675         oinfo = sb_dqinfo(sb, type)->dqi_priv;
 676         gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
 677         lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
 678         /* We can extend local file + global file. In local file we
 679          * can modify info, chunk header block and dquot block. In
 680          * global file we can modify info, tree and leaf block */
 681         return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
 682                ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
 683                3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
 684 }
 685
 686 static int ocfs2_acquire_dquot(struct dquot *dquot)
 687 {
 688         handle_t *handle;
 689         struct ocfs2_mem_dqinfo *oinfo =
 690                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
 691         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 692         int status = 0;
 693
 694         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
 695         /* We need an exclusive lock, because we're going to update use count
 696          * and instantiate possibly new dquot structure */
 697         status = ocfs2_lock_global_qf(oinfo, 1);
 698         if (status < 0)
 699                 goto out;
 700         handle = ocfs2_start_trans(osb,
 701                 ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
 702         if (IS_ERR(handle)) {
 703                 status = PTR_ERR(handle);
 704                 mlog_errno(status);
 705                 goto out_ilock;
 706         }
 707         status = dquot_acquire(dquot);
 708         ocfs2_commit_trans(osb, handle);
 709 out_ilock:
 710         ocfs2_unlock_global_qf(oinfo, 1);
 711 out:
 712         mlog_exit(status);
 713         return status;
 714 }
 715
 716 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 717 {
 718         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 719                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 720                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 721                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 722                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 723                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 724         int sync = 0;
 725         int status;
 726         struct super_block *sb = dquot->dq_sb;
 727         int type = dquot->dq_type;
 728         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 729         handle_t *handle;
 730         struct ocfs2_super *osb = OCFS2_SB(sb);
 731
 732         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
 733         dquot_mark_dquot_dirty(dquot);
 734
 735         /* In case user set some limits, sync dquot immediately to global
 736          * quota file so that information propagates quicker */
 737         spin_lock(&dq_data_lock);
 738         if (dquot->dq_flags & mask)
 739                 sync = 1;
 740         spin_unlock(&dq_data_lock);
 741         if (!sync) {
 742                 status = ocfs2_write_dquot(dquot);
 743                 goto out;
 744         }
 745         status = ocfs2_lock_global_qf(oinfo, 1);
 746         if (status < 0)
 747                 goto out;
 748         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 749         if (IS_ERR(handle)) {
 750                 status = PTR_ERR(handle);
 751                 mlog_errno(status);
 752                 goto out_ilock;
 753         }
 754         status = ocfs2_sync_dquot(dquot);
 755         if (status < 0) {
 756                 mlog_errno(status);
 757                 goto out_trans;
 758         }
 759         /* Now write updated local dquot structure */
 760         status = dquot_commit(dquot);
 761 out_trans:
 762         ocfs2_commit_trans(osb, handle);
 763 out_ilock:
 764         ocfs2_unlock_global_qf(oinfo, 1);
 765 out:
 766         mlog_exit(status);
 767         return status;
 768 }
 769
 770 /* This should happen only after set_dqinfo(). */
 771 static int ocfs2_write_info(struct super_block *sb, int type)
 772 {
 773         handle_t *handle;
 774         int status = 0;
 775         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 776
 777         mlog_entry_void();
 778
 779         status = ocfs2_lock_global_qf(oinfo, 1);
 780         if (status < 0)
 781                 goto out;
 782         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 783         if (IS_ERR(handle)) {
 784                 status = PTR_ERR(handle);
 785                 mlog_errno(status);
 786                 goto out_ilock;
 787         }
 788         status = dquot_commit_info(sb, type);
 789         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 790 out_ilock:
 791         ocfs2_unlock_global_qf(oinfo, 1);
 792 out:
 793         mlog_exit(status);
 794         return status;
 795 }
 796
 797 /* This is difficult. We have to lock quota inode and start transaction
 798  * in this function but we don't want to take the penalty of exlusive
 799  * quota file lock when we are just going to use cached structures. So
 800  * we just take read lock check whether we have dquot cached and if so,
 801  * we don't have to take the write lock... */
 802 static int ocfs2_dquot_initialize(struct inode *inode, int type)
 803 {
 804         handle_t *handle = NULL;
 805         int status = 0;
 806         struct super_block *sb = inode->i_sb;
 807         struct ocfs2_mem_dqinfo *oinfo;
 808         int exclusive = 0;
 809         int cnt;
 810         qid_t id;
 811
 812         mlog_entry_void();
 813
 814         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 815                 if (type != -1 && cnt != type)
 816                         continue;
 817                 if (!sb_has_quota_active(sb, cnt))
 818                         continue;
 819                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 820                 status = ocfs2_lock_global_qf(oinfo, 0);
 821                 if (status < 0)
 822                         goto out;
 823                 /* This is just a performance optimization not a reliable test.
 824                  * Since we hold an inode lock, noone can actually release
 825                  * the structure until we are finished with initialization. */
 826                 if (inode->i_dquot[cnt] != NODQUOT) {
 827                         ocfs2_unlock_global_qf(oinfo, 0);
 828                         continue;
 829                 }
 830                 /* When we have inode lock, we know that no dquot_release() can
 831                  * run and thus we can safely check whether we need to
 832                  * read+modify global file to get quota information or whether
 833                  * our node already has it. */
 834                 if (cnt == USRQUOTA)
 835                         id = inode->i_uid;
 836                 else if (cnt == GRPQUOTA)
 837                         id = inode->i_gid;
 838                 else
 839                         BUG();
 840                 /* Obtain exclusion from quota off... */
 841                 down_write(&sb_dqopt(sb)->dqptr_sem);
 842                 exclusive = !dquot_is_cached(sb, id, cnt);
 843                 up_write(&sb_dqopt(sb)->dqptr_sem);
 844                 if (exclusive) {
 845                         status = ocfs2_lock_global_qf(oinfo, 1);
 846                         if (status < 0) {
 847                                 exclusive = 0;
 848                                 mlog_errno(status);
 849                                 goto out_ilock;
 850                         }
 851                         handle = ocfs2_start_trans(OCFS2_SB(sb),
 852                                         ocfs2_calc_qinit_credits(sb, cnt));
 853                         if (IS_ERR(handle)) {
 854                                 status = PTR_ERR(handle);
 855                                 mlog_errno(status);
 856                                 goto out_ilock;
 857                         }
 858                 }
 859                 dquot_initialize(inode, cnt);
 860                 if (exclusive) {
 861                         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 862                         ocfs2_unlock_global_qf(oinfo, 1);
 863                 }
 864                 ocfs2_unlock_global_qf(oinfo, 0);
 865         }
 866         mlog_exit(0);
 867         return 0;
 868 out_ilock:
 869         if (exclusive)
 870                 ocfs2_unlock_global_qf(oinfo, 1);
 871         ocfs2_unlock_global_qf(oinfo, 0);
 872 out:
 873         mlog_exit(status);
 874         return status;
 875 }
 876
 877 static int ocfs2_dquot_drop_slow(struct inode *inode)
 878 {
 879         int status = 0;
 880         int cnt;
 881         int got_lock[MAXQUOTAS] = {0, 0};
 882         handle_t *handle;
 883         struct super_block *sb = inode->i_sb;
 884         struct ocfs2_mem_dqinfo *oinfo;
 885
 886         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 887                 if (!sb_has_quota_active(sb, cnt))
 888                         continue;
 889                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 890                 status = ocfs2_lock_global_qf(oinfo, 1);
 891                 if (status < 0)
 892                         goto out;
 893                 got_lock[cnt] = 1;
 894         }
 895         handle = ocfs2_start_trans(OCFS2_SB(sb),
 896                         ocfs2_calc_qinit_credits(sb, USRQUOTA) +
 897                         ocfs2_calc_qinit_credits(sb, GRPQUOTA));
 898         if (IS_ERR(handle)) {
 899                 status = PTR_ERR(handle);
 900                 mlog_errno(status);
 901                                 goto out;
 902         }
 903         dquot_drop(inode);
 904         ocfs2_commit_trans(OCFS2_SB(sb), handle);
 905 out:
 906         for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 907                 if (got_lock[cnt]) {
 908                         oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 909                         ocfs2_unlock_global_qf(oinfo, 1);
 910                 }
 911         return status;
 912 }
 913
 914 /* See the comment before ocfs2_dquot_initialize. */
 915 static int ocfs2_dquot_drop(struct inode *inode)
 916 {
 917         int status = 0;
 918         struct super_block *sb = inode->i_sb;
 919         struct ocfs2_mem_dqinfo *oinfo;
 920         int exclusive = 0;
 921         int cnt;
 922         int got_lock[MAXQUOTAS] = {0, 0};
 923
 924         mlog_entry_void();
 925         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 926                 if (!sb_has_quota_active(sb, cnt))
 927                         continue;
 928                 oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 929                 status = ocfs2_lock_global_qf(oinfo, 0);
 930                 if (status < 0)
 931                         goto out;
 932                 got_lock[cnt] = 1;
 933         }
 934         /* Lock against anyone releasing references so that when when we check
 935          * we know we are not going to be last ones to release dquot */
 936         down_write(&sb_dqopt(sb)->dqptr_sem);
 937         /* Urgh, this is a terrible hack :( */
 938         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 939                 if (inode->i_dquot[cnt] != NODQUOT &&
 940                     atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
 941                         exclusive = 1;
 942                         break;
 943                 }
 944         }
 945         if (!exclusive)
 946                 dquot_drop_locked(inode);
 947         up_write(&sb_dqopt(sb)->dqptr_sem);
 948 out:
 949         for (cnt = 0; cnt < MAXQUOTAS; cnt++)
 950                 if (got_lock[cnt]) {
 951                         oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
 952                         ocfs2_unlock_global_qf(oinfo, 0);
 953                 }
 954         /* In case we bailed out because we had to do expensive locking
 955          * do it now... */
 956         if (exclusive)
 957                 status = ocfs2_dquot_drop_slow(inode);
 958         mlog_exit(status);
 959         return status;
 960 }
 961
 962 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 963 {
 964         struct ocfs2_dquot *dquot =
 965                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 966
 967         if (!dquot)
 968                 return NULL;
 969         return &dquot->dq_dquot;
 970 }
 971
 972 static void ocfs2_destroy_dquot(struct dquot *dquot)
 973 {
 974         kmem_cache_free(ocfs2_dquot_cachep, dquot);
 975 }
 976
 977 struct dquot_operations ocfs2_quota_operations = {
 978         .initialize     = ocfs2_dquot_initialize,
 979         .drop           = ocfs2_dquot_drop,
 980         .alloc_space    = dquot_alloc_space,
 981         .alloc_inode    = dquot_alloc_inode,
 982         .free_space     = dquot_free_space,
 983         .free_inode     = dquot_free_inode,
 984         .transfer       = dquot_transfer,
 985         .write_dquot    = ocfs2_write_dquot,
 986         .acquire_dquot  = ocfs2_acquire_dquot,
 987         .release_dquot  = ocfs2_release_dquot,
 988         .mark_dirty     = ocfs2_mark_dquot_dirty,
 989         .write_info     = ocfs2_write_info,
 990         .alloc_dquot    = ocfs2_alloc_dquot,
 991         .destroy_dquot  = ocfs2_destroy_dquot,
 992 };
 993
 994 int ocfs2_quota_setup(void)
 995 {
 996         ocfs2_quota_wq = create_workqueue("o2quot");
 997         if (!ocfs2_quota_wq)
 998                 return -ENOMEM;
 999         return 0;
1000 }
1001
1002 void ocfs2_quota_shutdown(void)
1003 {
1004         if (ocfs2_quota_wq) {
1005                 flush_workqueue(ocfs2_quota_wq);
1006                 destroy_workqueue(ocfs2_quota_wq);
1007                 ocfs2_quota_wq = NULL;
1008         }
1009 }