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authorJan Kara <jack@suse.cz>2008-10-20 17:05:00 +0200
committerMark Fasheh <mfasheh@suse.com>2009-01-05 08:40:23 -0800
commit12c77527e4138bc3b17d17b0e0c909e4fc84924f (patch)
tree2776bbc914ebf8db7bdc2e450abf6a1504f50abe /fs/dquot.c
parent3d9ea253a0e73dccaa869888ec2ceb17ea76c810 (diff)
quota: Implement function for scanning active dquots
OCFS2 needs to scan all active dquots once in a while and sync quota information among cluster nodes. Provide a helper function for it so that it does not have to reimplement internally a list which VFS already has. Moreover this function is probably going to be useful for other clustered filesystems if they decide to use VFS quotas. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/dquot.c')
-rw-r--r--fs/dquot.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/fs/dquot.c b/fs/dquot.c
index ae8fd9e645c..075dc76904e 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -476,6 +476,41 @@ restart:
spin_unlock(&dq_list_lock);
}
+/* Call callback for every active dquot on given filesystem */
+int dquot_scan_active(struct super_block *sb,
+ int (*fn)(struct dquot *dquot, unsigned long priv),
+ unsigned long priv)
+{
+ struct dquot *dquot, *old_dquot = NULL;
+ int ret = 0;
+
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+ spin_lock(&dq_list_lock);
+ list_for_each_entry(dquot, &inuse_list, dq_inuse) {
+ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
+ continue;
+ if (dquot->dq_sb != sb)
+ continue;
+ /* Now we have active dquot so we can just increase use count */
+ atomic_inc(&dquot->dq_count);
+ dqstats.lookups++;
+ spin_unlock(&dq_list_lock);
+ dqput(old_dquot);
+ old_dquot = dquot;
+ 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 */
+ }
+ spin_unlock(&dq_list_lock);
+out:
+ dqput(old_dquot);
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ return ret;
+}
+
int vfs_quota_sync(struct super_block *sb, int type)
{
struct list_head *dirty;
@@ -2318,6 +2353,7 @@ EXPORT_SYMBOL(vfs_quota_on_path);
EXPORT_SYMBOL(vfs_quota_on_mount);
EXPORT_SYMBOL(vfs_quota_disable);
EXPORT_SYMBOL(vfs_quota_off);
+EXPORT_SYMBOL(dquot_scan_active);
EXPORT_SYMBOL(vfs_quota_sync);
EXPORT_SYMBOL(vfs_get_dqinfo);
EXPORT_SYMBOL(vfs_set_dqinfo);