* sure they cannot race with quotaon which first sets S_NOQUOTA flag and
* then drops all pointers to dquots from an inode.
*
- * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
- * from inodes (dquot_alloc_space() and such don't check the dq_lock).
- * Currently dquot is locked only when it is being read to memory (or space for
- * it is being allocated) on the first dqget() and when it is being released on
- * the last dqput(). The allocation and release oparations are serialized by
- * the dq_lock and by checking the use count in dquot_release(). Write
- * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
- * spinlock to internal buffers before writing.
+ * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to
+ * memory (or space for it is being allocated) on the first dqget(), when it is
+ * being written out, and when it is being released on the last dqput(). The
+ * allocation and release operations are serialized by the dq_lock and by
+ * checking the use count in dquot_release().
*
* Lock ordering (including related VFS locks) is the following:
- * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
+ * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
*/
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
mutex_lock(&dquot->dq_lock);
- mutex_lock(&dqopt->dqio_mutex);
if (!test_bit(DQ_READ_B, &dquot->dq_flags))
ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
if (ret < 0)
ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
/* Write the info if needed */
if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
+ down_write(&dqopt->dqio_sem);
ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
dquot->dq_sb, dquot->dq_id.type);
+ up_write(&dqopt->dqio_sem);
}
if (ret < 0)
goto out_iolock;
smp_mb__before_atomic();
set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
out_iolock:
- mutex_unlock(&dqopt->dqio_mutex);
mutex_unlock(&dquot->dq_lock);
return ret;
}
int ret = 0;
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
- mutex_lock(&dqopt->dqio_mutex);
+ mutex_lock(&dquot->dq_lock);
spin_lock(&dq_list_lock);
if (!clear_dquot_dirty(dquot)) {
spin_unlock(&dq_list_lock);
- goto out_sem;
+ goto out_lock;
}
spin_unlock(&dq_list_lock);
/* Inactive dquot can be only if there was error during read/init
ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
else
ret = -EIO;
-out_sem:
- mutex_unlock(&dqopt->dqio_mutex);
+out_lock:
+ mutex_unlock(&dquot->dq_lock);
return ret;
}
EXPORT_SYMBOL(dquot_commit);
/* Check whether we are not racing with some other dqget() */
if (atomic_read(&dquot->dq_count) > 1)
goto out_dqlock;
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
if (dqopt->ops[dquot->dq_id.type]->release_dqblk) {
ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
/* Write the info */
ret = ret2;
}
clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
out_dqlock:
mutex_unlock(&dquot->dq_lock);
return ret;
{
qsize_t space, cur_space;
qsize_t rsv_space = 0;
+ qsize_t inode_usage = 1;
struct dquot *transfer_from[MAXQUOTAS] = {};
int cnt, ret = 0;
char is_valid[MAXQUOTAS] = {};
if (IS_NOQUOTA(inode))
return 0;
+
+ if (inode->i_sb->dq_op->get_inode_usage) {
+ ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage);
+ if (ret)
+ return ret;
+ }
+
/* Initialize the arrays */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
warn_to[cnt].w_type = QUOTA_NL_NOWARN;
continue;
is_valid[cnt] = 1;
transfer_from[cnt] = i_dquot(inode)[cnt];
- ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
+ ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]);
if (ret)
goto over_quota;
ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
/* Due to IO error we might not have transfer_from[] structure */
if (transfer_from[cnt]) {
int wtype;
- wtype = info_idq_free(transfer_from[cnt], 1);
+ wtype = info_idq_free(transfer_from[cnt], inode_usage);
if (wtype != QUOTA_NL_NOWARN)
prepare_warning(&warn_from_inodes[cnt],
transfer_from[cnt], wtype);
if (wtype != QUOTA_NL_NOWARN)
prepare_warning(&warn_from_space[cnt],
transfer_from[cnt], wtype);
- dquot_decr_inodes(transfer_from[cnt], 1);
+ dquot_decr_inodes(transfer_from[cnt], inode_usage);
dquot_decr_space(transfer_from[cnt], cur_space);
dquot_free_reserved_space(transfer_from[cnt],
rsv_space);
}
- dquot_incr_inodes(transfer_to[cnt], 1);
+ dquot_incr_inodes(transfer_to[cnt], inode_usage);
dquot_incr_space(transfer_to[cnt], cur_space);
dquot_resv_space(transfer_to[cnt], rsv_space);
int ret;
struct quota_info *dqopt = sb_dqopt(sb);
- mutex_lock(&dqopt->dqio_mutex);
+ down_write(&dqopt->dqio_sem);
ret = dqopt->ops[type]->write_file_info(sb, type);
- mutex_unlock(&dqopt->dqio_mutex);
+ up_write(&dqopt->dqio_sem);
return ret;
}
EXPORT_SYMBOL(dquot_commit_info);
return -ESRCH;
if (!dqopt->ops[qid->type]->get_next_id)
return -ENOSYS;
- mutex_lock(&dqopt->dqio_mutex);
+ down_read(&dqopt->dqio_sem);
err = dqopt->ops[qid->type]->get_next_id(sb, qid);
- mutex_unlock(&dqopt->dqio_mutex);
+ up_read(&dqopt->dqio_sem);
return err;
}
EXPORT_SYMBOL(dquot_get_next_id);
dqopt->info[type].dqi_format = fmt;
dqopt->info[type].dqi_fmt_id = format_id;
INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
- mutex_lock(&dqopt->dqio_mutex);
+ down_read(&dqopt->dqio_sem);
error = dqopt->ops[type]->read_file_info(sb, type);
if (error < 0) {
- mutex_unlock(&dqopt->dqio_mutex);
+ up_read(&dqopt->dqio_sem);
goto out_file_init;
}
if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
- mutex_unlock(&dqopt->dqio_mutex);
+ up_read(&dqopt->dqio_sem);
spin_lock(&dq_state_lock);
dqopt->flags |= dquot_state_flag(flags, type);
spin_unlock(&dq_state_lock);
git.samba.org / sfrench / cifs-2.6.git / blobdiff