ext4: 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 attempt.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index fb50f9a..c1d570e 100644 (file)
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -284,12 +284,16 @@ ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
                error = __ext4_set_acl(handle, inode, ACL_TYPE_DEFAULT,
                                       default_acl, XATTR_CREATE);
                posix_acl_release(default_acl);
+       } else {
+               inode->i_default_acl = NULL;
        }
        if (acl) {
                if (!error)
                        error = __ext4_set_acl(handle, inode, ACL_TYPE_ACCESS,
                                               acl, XATTR_CREATE);
                posix_acl_release(acl);
+       } else {
+               inode->i_acl = NULL;
        }
        return error;
 }