ext2: cache NULL when both default_acl and acl are NULL

default_acl and acl of newly created inode will be initiated as
ACL_NOT_CACHED in vfs function inode_init_always() and later will be
updated by calling xxx_init_acl() in specific filesystems.  However,
when default_acl and acl are NULL, then they keep the value of
ACL_NOT_CACHED. This patch changes the code to cache NULL for acl /
default_acl in this case to save unnecessary ACL lookup in future.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 224c04abb2e5..cf4c77f8dd08 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -256,11 +256,15 @@ ext2_init_acl(struct inode *inode, struct inode *dir)
         if (default_acl) {
                 error = __ext2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
                 posix_acl_release(default_acl);
+        } else {
+                inode->i_default_acl = NULL;
         }
         if (acl) {
                 if (!error)
                         error = __ext2_set_acl(inode, acl, ACL_TYPE_ACCESS);
                 posix_acl_release(acl);
+        } else {
+                inode->i_acl = NULL;
         }
         return error;
 }