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Commit 12c77527 authored by Jan Kara's avatar Jan Kara Committed by Mark Fasheh
Browse files

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: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 3d9ea253

fs/dquot.c

+36 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/quotaops.h

+3 −0
Original line number Diff line number Diff line
@@ -28,6 +28,9 @@ int dquot_drop_locked(struct inode *inode); 
struct dquot *dqget(struct super_block *sb, unsigned int id, int type);

void dqput(struct dquot *dquot);

int dquot_is_cached(struct super_block *sb, unsigned int id, int type);

int dquot_scan_active(struct super_block *sb,

		      int (*fn)(struct dquot *dquot, unsigned long priv),

		      unsigned long priv);



int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);

int dquot_alloc_inode(const struct inode *inode, qsize_t number);