Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs pile 4 from Al Viro:
 "list_lru pile, mostly"

This came out of Andrew's pile, Al ended up doing the merge work so that
Andrew didn't have to.

Additionally, a few fixes.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (42 commits)
  super: fix for destroy lrus
  list_lru: dynamically adjust node arrays
  shrinker: Kill old ->shrink API.
  shrinker: convert remaining shrinkers to count/scan API
  staging/lustre/libcfs: cleanup linux-mem.h
  staging/lustre/ptlrpc: convert to new shrinker API
  staging/lustre/obdclass: convert lu_object shrinker to count/scan API
  staging/lustre/ldlm: convert to shrinkers to count/scan API
  hugepage: convert huge zero page shrinker to new shrinker API
  i915: bail out earlier when shrinker cannot acquire mutex
  drivers: convert shrinkers to new count/scan API
  fs: convert fs shrinkers to new scan/count API
  xfs: fix dquot isolation hang
  xfs-convert-dquot-cache-lru-to-list_lru-fix
  xfs: convert dquot cache lru to list_lru
  xfs: rework buffer dispose list tracking
  xfs-convert-buftarg-lru-to-generic-code-fix
  xfs: convert buftarg LRU to generic code
  fs: convert inode and dentry shrinking to be node aware
  vmscan: per-node deferred work
  ...

3 files changed, 18 insertions, 7 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e79bc6ce828e..de434f309af0 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2006,17 +2006,18 @@ static void nfs_access_free_list(struct list_head *head)
         }
 }
 
-int nfs_access_cache_shrinker(struct shrinker *shrink,
-                              struct shrink_control *sc)
+unsigned long
+nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc)
 {
         LIST_HEAD(head);
         struct nfs_inode *nfsi, *next;
         struct nfs_access_entry *cache;
         int nr_to_scan = sc->nr_to_scan;
         gfp_t gfp_mask = sc->gfp_mask;
+        long freed = 0;
 
         if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
-                return (nr_to_scan == 0) ? 0 : -1;
+                return SHRINK_STOP;
 
         spin_lock(&nfs_access_lru_lock);
         list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) {
@@ -2032,6 +2033,7 @@ int nfs_access_cache_shrinker(struct shrinker *shrink,
                                 struct nfs_access_entry, lru);
                 list_move(&cache->lru, &head);
                 rb_erase(&cache->rb_node, &nfsi->access_cache);
+                freed++;
                 if (!list_empty(&nfsi->access_cache_entry_lru))
                         list_move_tail(&nfsi->access_cache_inode_lru,
                                         &nfs_access_lru_list);
@@ -2046,7 +2048,13 @@ remove_lru_entry:
         }
         spin_unlock(&nfs_access_lru_lock);
         nfs_access_free_list(&head);
-        return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure;
+        return freed;
+}
+
+unsigned long
+nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc)
+{
+        return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries));
 }
 
 static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index d388302c005f..38da8c2b81ac 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -273,8 +273,10 @@ extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
                            const char *ip_addr);
 
 /* dir.c */
-extern int nfs_access_cache_shrinker(struct shrinker *shrink,
-                                        struct shrink_control *sc);
+extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
+                                            struct shrink_control *sc);
+extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
+                                           struct shrink_control *sc);
 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 5793f24613c8..a03b9c6f9489 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -360,7 +360,8 @@ static void unregister_nfs4_fs(void)
 #endif
 
 static struct shrinker acl_shrinker = {
-        .shrink         = nfs_access_cache_shrinker,
+        .count_objects  = nfs_access_cache_count,
+        .scan_objects   = nfs_access_cache_scan,
         .seeks          = DEFAULT_SEEKS,
 };