NFS: Clean up nfs_access_zap_cache()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 31 insertions, 29 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 58b1f744c91e..1c71fc213716 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1697,6 +1697,17 @@ static void nfs_access_free_entry(struct nfs_access_entry *entry)
         smp_mb__after_atomic_dec();
 }
 
+static void nfs_access_free_list(struct list_head *head)
+{
+        struct nfs_access_entry *cache;
+
+        while (!list_empty(head)) {
+                cache = list_entry(head->next, struct nfs_access_entry, lru);
+                list_del(&cache->lru);
+                nfs_access_free_entry(cache);
+        }
+}
+
 int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask)
 {
         LIST_HEAD(head);
@@ -1743,52 +1754,41 @@ remove_lru_entry:
                 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);
-        }
+        nfs_access_free_list(&head);
         return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure;
 }
 
-static void __nfs_access_zap_cache(struct inode *inode)
+static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
 {
-        struct nfs_inode *nfsi = NFS_I(inode);
         struct rb_root *root_node = &nfsi->access_cache;
-        struct rb_node *n, *dispose = NULL;
+        struct rb_node *n;
         struct nfs_access_entry *entry;
 
         /* Unhook entries from the cache */
         while ((n = rb_first(root_node)) != NULL) {
                 entry = rb_entry(n, struct nfs_access_entry, rb_node);
                 rb_erase(n, root_node);
-                list_del(&entry->lru);
-                n->rb_left = dispose;
-                dispose = n;
+                list_move(&entry->lru, head);
         }
         nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS;
-        spin_unlock(&inode->i_lock);
-
-        /* Now kill them all! */
-        while (dispose != NULL) {
-                n = dispose;
-                dispose = n->rb_left;
-                nfs_access_free_entry(rb_entry(n, struct nfs_access_entry, rb_node));
-        }
 }
 
 void nfs_access_zap_cache(struct inode *inode)
 {
+        LIST_HEAD(head);
+
+        if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0)
+                return;
         /* Remove from global LRU init */
-        if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
-                spin_lock(&nfs_access_lru_lock);
+        spin_lock(&nfs_access_lru_lock);
+        if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
                 list_del_init(&NFS_I(inode)->access_cache_inode_lru);
-                spin_unlock(&nfs_access_lru_lock);
-        }
 
         spin_lock(&inode->i_lock);
-        /* This will release the spinlock */
-        __nfs_access_zap_cache(inode);
+        __nfs_access_zap_cache(NFS_I(inode), &head);
+        spin_unlock(&inode->i_lock);
+        spin_unlock(&nfs_access_lru_lock);
+        nfs_access_free_list(&head);
 }
 
 static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred)
@@ -1839,8 +1839,8 @@ out_stale:
         nfs_access_free_entry(cache);
         return -ENOENT;
 out_zap:
-        /* This will release the spinlock */
-        __nfs_access_zap_cache(inode);
+        spin_unlock(&inode->i_lock);
+        nfs_access_zap_cache(inode);
         return -ENOENT;
 }
 
@@ -1895,9 +1895,11 @@ static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *s
         smp_mb__after_atomic_inc();
 
         /* Add inode to global LRU list */
-        if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
+        if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
                 spin_lock(&nfs_access_lru_lock);
-                list_add_tail(&NFS_I(inode)->access_cache_inode_lru, &nfs_access_lru_list);
+                if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
+                        list_add_tail(&NFS_I(inode)->access_cache_inode_lru,
+                                        &nfs_access_lru_list);
                 spin_unlock(&nfs_access_lru_lock);
         }
 }