vfs: create a generic checking and prep function for FS_IOC_SETFLAGS

Create a generic function to check incoming FS_IOC_SETFLAGS flag values
and later prepare the inode for updates so that we can standardize the
implementations that follow ext4's flag values.

Note that the efivarfs implementation no longer fails a no-op SETFLAGS
without CAP_LINUX_IMMUTABLE since that's the behavior in ext*.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index acbbaf7a0bb2..45e1a5d11af3 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -74,13 +74,11 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 				err = -EPERM;
 				goto setflags_out;
 			}
-			if (((flags ^ REISERFS_I(inode)->
-			      i_attrs) & (REISERFS_IMMUTABLE_FL |
-					  REISERFS_APPEND_FL))
-			    && !capable(CAP_LINUX_IMMUTABLE)) {
-				err = -EPERM;
+			err = vfs_ioc_setflags_prepare(inode,
+						     REISERFS_I(inode)->i_attrs,
+						     flags);
+			if (err)
 				goto setflags_out;
-			}
 			if ((flags & REISERFS_NOTAIL_FL) &&
 			    S_ISREG(inode->i_mode)) {
 				int result;