aboutsummaryrefslogtreecommitdiff
path: root/fs
diff options
context:
space:
mode:
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/dir.c44
-rw-r--r--fs/nfs/internal.h3
-rw-r--r--fs/nfs/super.c5
3 files changed, 52 insertions, 0 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index bf4f5ffda70..067d144d141 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1651,6 +1651,50 @@ static void nfs_access_free_entry(struct nfs_access_entry *entry)
smp_mb__after_atomic_dec();
}
+int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask)
+{
+ LIST_HEAD(head);
+ struct nfs_inode *nfsi;
+ struct nfs_access_entry *cache;
+
+ spin_lock(&nfs_access_lru_lock);
+restart:
+ list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) {
+ struct inode *inode;
+
+ if (nr_to_scan-- == 0)
+ break;
+ inode = igrab(&nfsi->vfs_inode);
+ if (inode == NULL)
+ continue;
+ spin_lock(&inode->i_lock);
+ if (list_empty(&nfsi->access_cache_entry_lru))
+ goto remove_lru_entry;
+ cache = list_entry(nfsi->access_cache_entry_lru.next,
+ struct nfs_access_entry, lru);
+ list_move(&cache->lru, &head);
+ rb_erase(&cache->rb_node, &nfsi->access_cache);
+ if (!list_empty(&nfsi->access_cache_entry_lru))
+ list_move_tail(&nfsi->access_cache_inode_lru,
+ &nfs_access_lru_list);
+ else {
+remove_lru_entry:
+ list_del_init(&nfsi->access_cache_inode_lru);
+ clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
+ }
+ spin_unlock(&inode->i_lock);
+ iput(inode);
+ goto restart;
+ }
+ spin_unlock(&nfs_access_lru_lock);
+ while (!list_empty(&head)) {
+ cache = list_entry(head.next, struct nfs_access_entry, lru);
+ list_del(&cache->lru);
+ nfs_access_free_entry(cache);
+ }
+ return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure;
+}
+
static void __nfs_access_zap_cache(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index e4f4e5def0f..660e9ff5341 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -66,6 +66,9 @@ extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
struct page *page);
#endif
+/* dir.c */
+extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
+
/* inode.c */
extern struct inode *nfs_alloc_inode(struct super_block *sb);
extern void nfs_destroy_inode(struct inode *);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index e8a9bee74d9..06c321beacf 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -221,6 +221,8 @@ module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
&nfs_idmap_cache_timeout, 0644);
#endif
+static struct shrinker *acl_shrinker;
+
/*
* Register the NFS filesystems
*/
@@ -240,6 +242,7 @@ int __init register_nfs_fs(void)
if (ret < 0)
goto error_2;
#endif
+ acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker);
return 0;
#ifdef CONFIG_NFS_V4
@@ -257,6 +260,8 @@ error_0:
*/
void __exit unregister_nfs_fs(void)
{
+ if (acl_shrinker != NULL)
+ remove_shrinker(acl_shrinker);
#ifdef CONFIG_NFS_V4
unregister_filesystem(&nfs4_fs_type);
nfs_unregister_sysctl();