buffer: add BH_Prio and BH_Meta flags
Add buffer_head flags so that buffer cache writebacks can be marked
with the the appropriate request flags, so that metadata blocks can be
marked appropriately in blktrace.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/buffer.c b/fs/buffer.c
index b4dcb34..a15575c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2988,6 +2988,11 @@
/* Take care of bh's that straddle the end of the device */
guard_bh_eod(rw, bio, bh);
+ if (buffer_meta(bh))
+ rw |= REQ_META;
+ if (buffer_prio(bh))
+ rw |= REQ_PRIO;
+
bio_get(bio);
submit_bio(rw, bio);