iput() can potentially attempt to allocate memory, so we should avoid
calling it in a memory shrinker. Instead, rely on the fact that iput() will
call nfs_access_zap_cache().
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/dir.c | 19 ++++---------------
1 files changed, 4 insertions(+), 15 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 5582e9d..7bf20be 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1716,22 +1716,14 @@ int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask)
if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
return -1;
-restart:
+
spin_lock(&nfs_access_lru_lock);
list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) {
- struct rw_semaphore *s_umount;
struct inode *inode;
if (nr_to_scan-- == 0)
break;
- s_umount = &nfsi->vfs_inode.i_sb->s_umount;
- if (!down_read_trylock(s_umount))
- continue;
- inode = igrab(&nfsi->vfs_inode);
- if (inode == NULL) {
- up_read(s_umount);
- continue;
- }
+ inode = &nfsi->vfs_inode;
spin_lock(&inode->i_lock);
if (list_empty(&nfsi->access_cache_entry_lru))
goto remove_lru_entry;
@@ -1745,13 +1737,10 @@ restart:
else {
remove_lru_entry:
list_del_init(&nfsi->access_cache_inode_lru);
+ smp_mb__before_clear_bit();
clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
+ smp_mb__after_clear_bit();
}
- spin_unlock(&inode->i_lock);
- spin_unlock(&nfs_access_lru_lock);
- iput(inode);
- up_read(s_umount);
- goto restart;
}
spin_unlock(&nfs_access_lru_lock);
nfs_access_free_list(&head);
--
1.6.6.1
--
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