xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS

Source kernel commit: 9070733b4efac4bf17f299a81b01c15e206f9ff5

xfs has defined PF_FSTRANS to declare a scope GFP_NOFS semantic quite
some time ago.  We would like to make this concept more generic and use
it for other filesystems as well.  Let's start by giving the flag a more
generic name PF_MEMALLOC_NOFS which is in line with an exiting
PF_MEMALLOC_NOIO already used for the same purpose for GFP_NOIO
contexts.  Replace all PF_FSTRANS usage from the xfs code in the first
step before we introduce a full API for it as xfs uses the flag directly
anyway.

This patch doesn't introduce any functional change.

Link: http://lkml.kernel.org/r/20170306131408.9828-4-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Chris Mason <clm@fb.com>
Cc: David Sterba <dsterba@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Nikolay Borisov <nborisov@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c
index 7df320d9cd2d2f63935064fa80a15e79f490d41e..a9e1fa805a84086d225fbafb8b8b17583e067ecd 100644 (file)
--- a/libxfs/xfs_btree.c
+++ b/libxfs/xfs_btree.c
@@ -2883,7 +2883,7 @@ xfs_btree_split_worker(
        struct xfs_btree_split_args     *args = container_of(work,
                                                struct xfs_btree_split_args, work);
        unsigned long           pflags;
-       unsigned long           new_pflags = PF_FSTRANS;
+       unsigned long           new_pflags = PF_MEMALLOC_NOFS;
 
        /*
         * we are in a transaction context here, but may also be doing work