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, 3 deletions

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 7350f53f3b51..8be87857605c 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -101,9 +101,6 @@ int v9fs_check_acl(struct inode *inode, int mask)
         struct posix_acl *acl;
         struct v9fs_session_info *v9ses;
 
-        if (mask & MAY_NOT_BLOCK)
-                return -ECHILD;
-
         v9ses = v9fs_inode2v9ses(inode);
         if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
                         ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {