vfs: move ACL cache lookup into generic code

This moves logic for checking the cached ACL values from low-level
filesystems into generic code.  The end result is a streamlined ACL
check that doesn't need to load the inode->i_op->check_acl pointer at
all for the common cached case.

The filesystems also don't need to check for a non-blocking RCU walk
case in their acl_check() functions, because that is all handled at a
VFS layer.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 6 deletions

diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 60d900fcc3db..4cd9e2e4085e 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -242,12 +242,6 @@ ext4_check_acl(struct inode *inode, int mask)
 {
         struct posix_acl *acl;
 
-        if (mask & MAY_NOT_BLOCK) {
-                if (!negative_cached_acl(inode, ACL_TYPE_ACCESS))
-                        return -ECHILD;
-                return -EAGAIN;
-        }
-
         acl = ext4_get_acl(inode, ACL_TYPE_ACCESS);
         if (IS_ERR(acl))
                 return PTR_ERR(acl);