ext4: mark all metadata I/O with REQ_META

As Dave Chinner pointed out at the 2013 LSF/MM workshop, it's
important that metadata I/O requests are marked as such to avoid
priority inversions caused by I/O bandwidth throttling.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 18d36d85f5c9..00a818d67b54 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -166,7 +166,7 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
         trace_ext4_load_inode_bitmap(sb, block_group);
         bh->b_end_io = ext4_end_bitmap_read;
         get_bh(bh);
-        submit_bh(READ, bh);
+        submit_bh(READ | REQ_META | REQ_PRIO, bh);
         wait_on_buffer(bh);
         if (!buffer_uptodate(bh)) {
                 put_bh(bh);