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buffer: add BH_Prio and BH_Meta flags

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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>
This commit is contained in:
Theodore Ts'o 2013-04-20 19:58:37 -04:00
parent 9f203507ed
commit 877f962c5e
2 changed files with 9 additions and 0 deletions
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5
fs/buffer.c
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@ -2988,6 +2988,11 @@ int submit_bh(int rw, struct buffer_head * bh)
/* 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);