diff options
Diffstat (limited to 'fs/quota')
| -rw-r--r-- | fs/quota/Kconfig | 7 | ||||
| -rw-r--r-- | fs/quota/dquot.c | 20 | ||||
| -rw-r--r-- | fs/quota/quota.c | 14 |
3 files changed, 32 insertions, 9 deletions
diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig index 880fd988436..c51df1dd237 100644 --- a/fs/quota/Kconfig +++ b/fs/quota/Kconfig @@ -8,9 +8,10 @@ config QUOTA help If you say Y here, you will be able to set per user limits for disk usage (also called disk quotas). Currently, it works for the - ext2, ext3, and reiserfs file system. ext3 also supports journalled - quotas for which you don't need to run quotacheck(8) after an unclean - shutdown. + ext2, ext3, ext4, jfs, ocfs2 and reiserfs file systems. + Note that gfs2 and xfs use their own quota system. + Ext3, ext4 and reiserfs also support journaled quotas for which + you don't need to run quotacheck(8) after an unclean shutdown. For further details, read the Quota mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>, or the documentation provided with the quota tools. Probably the quota support is only useful for diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 831d49a4111..7f30bdc57d1 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -528,7 +528,7 @@ restart: if (atomic_read(&dquot->dq_count)) { DEFINE_WAIT(wait); - atomic_inc(&dquot->dq_count); + dqgrab(dquot); prepare_to_wait(&dquot->dq_wait_unused, &wait, TASK_UNINTERRUPTIBLE); spin_unlock(&dq_list_lock); @@ -581,9 +581,17 @@ int dquot_scan_active(struct super_block *sb, dqstats_inc(DQST_LOOKUPS); dqput(old_dquot); old_dquot = dquot; - ret = fn(dquot, priv); - if (ret < 0) - goto out; + /* + * ->release_dquot() can be racing with us. Our reference + * protects us from new calls to it so just wait for any + * outstanding call and recheck the DQ_ACTIVE_B after that. + */ + wait_on_dquot(dquot); + if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) { + ret = fn(dquot, priv); + if (ret < 0) + goto out; + } spin_lock(&dq_list_lock); /* We are safe to continue now because our dquot could not * be moved out of the inuse list while we hold the reference */ @@ -624,7 +632,7 @@ int dquot_writeback_dquots(struct super_block *sb, int type) /* Now we have active dquot from which someone is * holding reference so we can safely just increase * use count */ - atomic_inc(&dquot->dq_count); + dqgrab(dquot); spin_unlock(&dq_list_lock); dqstats_inc(DQST_LOOKUPS); err = sb->dq_op->write_dquot(dquot); @@ -694,6 +702,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) struct dquot *dquot; unsigned long freed = 0; + spin_lock(&dq_list_lock); head = free_dquots.prev; while (head != &free_dquots && sc->nr_to_scan) { dquot = list_entry(head, struct dquot, dq_free); @@ -705,6 +714,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) freed++; head = free_dquots.prev; } + spin_unlock(&dq_list_lock); return freed; } diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 2b363e23f36..ff3f0b3cfdb 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -278,6 +278,17 @@ static int quota_getxquota(struct super_block *sb, int type, qid_t id, return ret; } +static int quota_rmxquota(struct super_block *sb, void __user *addr) +{ + __u32 flags; + + if (copy_from_user(&flags, addr, sizeof(flags))) + return -EFAULT; + if (!sb->s_qcop->rm_xquota) + return -ENOSYS; + return sb->s_qcop->rm_xquota(sb, flags); +} + /* Copy parameters and call proper function */ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void __user *addr, struct path *path) @@ -316,8 +327,9 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, return sb->s_qcop->quota_sync(sb, type); case Q_XQUOTAON: case Q_XQUOTAOFF: - case Q_XQUOTARM: return quota_setxstate(sb, cmd, addr); + case Q_XQUOTARM: + return quota_rmxquota(sb, addr); case Q_XGETQSTAT: return quota_getxstate(sb, addr); case Q_XGETQSTATV: |