xfs: Correctly lock inode when removing suid and file capabilities

xfs: Correctly lock inode when removing suid and file capabilities

From a6de82cab123beaf9406024943caa0242f0618b0 Mon Sep 17 00:00:00 2001

Currently XFS calls file_remove_privs() without holding i_mutex. This is
wrong because that function can end up messing with file permissions and
file capabilities stored in xattrs for which we need i_mutex held.

Fix the problem by grabbing iolock exclusively when we will need to
change anything in permissions / xattrs.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Orabug: 24803533
Signed-off-by: darrick.wong@oracle.com