quota: move code from sync_quota_sb into vfs_quota_sync

Currenly sync_quota_sb does a lot of sync and truncate action that only
applies to "VFS" style quotas and is actively harmful for the sync
performance in XFS.  Move it into vfs_quota_sync and add a wait parameter
to ->quota_sync to tell if we need it or not.

My audit of the GFS2 code says it's also not needed given the way GFS2
implements quotas, but I'd be happy if this can get a detailed review.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>

2 files changed, 2 insertions, 17 deletions

diff --git a/include/linux/quota.h b/include/linux/quota.h
index a6861f117480..570348cbccb1 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -324,7 +324,7 @@ struct dquot_operations {
 struct quotactl_ops {
         int (*quota_on)(struct super_block *, int, int, char *, int);
         int (*quota_off)(struct super_block *, int, int);
-        int (*quota_sync)(struct super_block *, int);
+        int (*quota_sync)(struct super_block *, int, int);
         int (*get_info)(struct super_block *, int, struct if_dqinfo *);
         int (*set_info)(struct super_block *, int, struct if_dqinfo *);
         int (*get_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 69d26bc0f884..8cfd0d44c994 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -19,13 +19,6 @@ static inline struct quota_info *sb_dqopt(struct super_block *sb)
 /*
  * declaration of quota_function calls in kernel.
  */
-void sync_quota_sb(struct super_block *sb, int type);
-static inline void writeout_quota_sb(struct super_block *sb, int type)
-{
-        if (sb->s_qcop && sb->s_qcop->quota_sync)
-                sb->s_qcop->quota_sync(sb, type);
-}
-
 void inode_add_rsv_space(struct inode *inode, qsize_t number);
 void inode_claim_rsv_space(struct inode *inode, qsize_t number);
 void inode_sub_rsv_space(struct inode *inode, qsize_t number);
@@ -67,7 +60,7 @@ int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
         int format_id, int type);
 int vfs_quota_off(struct super_block *sb, int type, int remount);
 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags);
-int vfs_quota_sync(struct super_block *sb, int type);
+int vfs_quota_sync(struct super_block *sb, int type, int wait);
 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
@@ -340,14 +333,6 @@ static inline void vfs_dq_free_inode(struct inode *inode)
 {
 }
 
-static inline void sync_quota_sb(struct super_block *sb, int type)
-{
-}
-
-static inline void writeout_quota_sb(struct super_block *sb, int type)
-{
-}
-
 static inline int vfs_dq_off(struct super_block *sb, int remount)
 {
         return 0;