xfs: per-filesystem dquot LRU lists

Replace the global dquot lru lists with a per-filesystem one.

Note that the shrinker isn't wire up to the per-superblock VFS shrinker
infrastructure as would have problems summing up and splitting the counts
for inodes and dquots.  I don't think this is a major problem as the quota
cache isn't as interwinded with the inode cache as the dentry cache is,
because an inode that is dropped from the cache will generally release
a dquot reference, but most of the time it won't be the last one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 89f213f7252a..c236bba9bfab 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -56,9 +56,6 @@ typedef struct xfs_qm {
         xfs_dqlist_t    *qm_usr_dqhtable;/* udquot hash table */
         xfs_dqlist_t    *qm_grp_dqhtable;/* gdquot hash table */
         uint             qm_dqhashmask;  /* # buckets in dq hashtab - 1 */
-        struct list_head qm_dqfrlist;    /* freelist of dquots */
-        struct mutex     qm_dqfrlist_lock;
-        int              qm_dqfrlist_cnt;
         uint             qm_nrefs;       /* file systems with quota on */
         kmem_zone_t     *qm_dqzone;      /* dquot mem-alloc zone */
         kmem_zone_t     *qm_dqtrxzone;   /* t_dqinfo of transactions */
@@ -71,6 +68,9 @@ typedef struct xfs_qm {
 typedef struct xfs_quotainfo {
         xfs_inode_t     *qi_uquotaip;    /* user quota inode */
         xfs_inode_t     *qi_gquotaip;    /* group quota inode */
+        struct list_head qi_lru_list;
+        struct mutex     qi_lru_lock;
+        int              qi_lru_count;
         struct list_head qi_dqlist;      /* all dquots in filesys */
         struct mutex     qi_dqlist_lock;
         int              qi_dquots;
@@ -91,6 +91,7 @@ typedef struct xfs_quotainfo {
         xfs_qcnt_t       qi_isoftlimit;  /* default inode count soft limit */
         xfs_qcnt_t       qi_rtbhardlimit;/* default realtime blk hard limit */
         xfs_qcnt_t       qi_rtbsoftlimit;/* default realtime blk soft limit */
+        struct shrinker  qi_shrinker;
 } xfs_quotainfo_t;