quota: Add callbacks for allocating and destroying dquot structures

Some filesystems would like to keep private information together with each
dquot. Add callbacks alloc_dquot and destroy_dquot allowing filesystem to
allocate larger dquots from their private slab in a similar fashion we
currently allocate inodes.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/quota.h b/include/linux/quota.h
index 40401b554484..3ce708c2cb3c 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -292,6 +292,8 @@ struct dquot_operations {
         int (*free_inode) (const struct inode *, unsigned long);
         int (*transfer) (struct inode *, struct iattr *);
         int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
+        struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
+        void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
         int (*acquire_dquot) (struct dquot *);          /* Quota is going to be created on disk */
         int (*release_dquot) (struct dquot *);          /* Quota is going to be deleted from disk */
         int (*mark_dirty) (struct dquot *);             /* Dquot is marked dirty */