diff options
| -rw-r--r-- | fs/nfs/dir.c | 44 | ||||
| -rw-r--r-- | fs/nfs/internal.h | 3 | ||||
| -rw-r--r-- | fs/nfs/super.c | 5 |
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(); |