ext4: add __GFP_NOWARN to GFP_NOWAIT in readahead

Since commit e509ad4 ("ext4: use bdev_getblk() to avoid memory
reclaim in readahead path") rightly replaced GFP_NOFAIL allocations by
GFP_NOWAIT allocations, I've occasionally been seeing "page allocation
failure: order:0" warnings under load: all with
ext4_sb_breadahead_unmovable() in the stack.  I don't think those warnings
are of any interest: suppress them with __GFP_NOWARN.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: e509ad4 ("ext4: use bdev_getblk() to avoid memory reclaim in readahead path")
Signed-off-by: Hugh Dickins <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Cc: Hui Zhu <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Hugh Dickins

fs/ext4/super.c

@@ -262,7 +262,7 @@ struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
 {
 	struct buffer_head *bh = bdev_getblk(sb->s_bdev, block,
-			sb->s_blocksize, GFP_NOWAIT);
+			sb->s_blocksize, GFP_NOWAIT | __GFP_NOWARN);
 
 	if (likely(bh)) {
 		if (trylock_buffer(bh))