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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>
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parent
3d9ea253a0
commit
12c77527e4
36
fs/dquot.c
36
fs/dquot.c
@ -476,6 +476,41 @@ restart:
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spin_unlock(&dq_list_lock);
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}
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/* Call callback for every active dquot on given filesystem */
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int dquot_scan_active(struct super_block *sb,
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int (*fn)(struct dquot *dquot, unsigned long priv),
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unsigned long priv)
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{
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struct dquot *dquot, *old_dquot = NULL;
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int ret = 0;
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mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
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spin_lock(&dq_list_lock);
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list_for_each_entry(dquot, &inuse_list, dq_inuse) {
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if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
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continue;
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if (dquot->dq_sb != sb)
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continue;
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/* Now we have active dquot so we can just increase use count */
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atomic_inc(&dquot->dq_count);
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dqstats.lookups++;
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spin_unlock(&dq_list_lock);
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dqput(old_dquot);
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old_dquot = dquot;
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ret = fn(dquot, priv);
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if (ret < 0)
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goto out;
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spin_lock(&dq_list_lock);
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/* We are safe to continue now because our dquot could not
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* be moved out of the inuse list while we hold the reference */
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}
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spin_unlock(&dq_list_lock);
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out:
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dqput(old_dquot);
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
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return ret;
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}
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int vfs_quota_sync(struct super_block *sb, int type)
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{
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struct list_head *dirty;
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@ -2318,6 +2353,7 @@ EXPORT_SYMBOL(vfs_quota_on_path);
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EXPORT_SYMBOL(vfs_quota_on_mount);
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EXPORT_SYMBOL(vfs_quota_disable);
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EXPORT_SYMBOL(vfs_quota_off);
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EXPORT_SYMBOL(dquot_scan_active);
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EXPORT_SYMBOL(vfs_quota_sync);
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EXPORT_SYMBOL(vfs_get_dqinfo);
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EXPORT_SYMBOL(vfs_set_dqinfo);
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@ -28,6 +28,9 @@ int dquot_drop_locked(struct inode *inode);
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struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
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void dqput(struct dquot *dquot);
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int dquot_is_cached(struct super_block *sb, unsigned int id, int type);
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int dquot_scan_active(struct super_block *sb,
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int (*fn)(struct dquot *dquot, unsigned long priv),
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unsigned long priv);
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int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
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int dquot_alloc_inode(const struct inode *inode, qsize_t number);
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