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authorJens Axboe <jens.axboe@oracle.com>2008-08-22 10:00:36 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-08-27 09:50:19 +0200
commit48fd4f93a00eac844678629f2f00518e146ed30d (patch)
treec71f6792742886db9912078c70b3e8806e9f260f /fs/buffer.c
parenta4a778971b9cfcbedb8648ba502d801f7db04c47 (diff)
downloadlinux-48fd4f93a00eac844678629f2f00518e146ed30d.tar.bz2
block: submit_bh() inadvertently discards barrier flag on a sync write
Reported by Milan Broz <mbroz@redhat.com>, commit 18ce3751 inadvertently made submit_bh() discard the barrier bit for a WRITE_SYNC request. Fix that up. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 38653e36e225..ac78d4c19b3b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2926,14 +2926,17 @@ int submit_bh(int rw, struct buffer_head * bh)
BUG_ON(!buffer_mapped(bh));
BUG_ON(!bh->b_end_io);
- if (buffer_ordered(bh) && (rw == WRITE))
- rw = WRITE_BARRIER;
+ /*
+ * Mask in barrier bit for a write (could be either a WRITE or a
+ * WRITE_SYNC
+ */
+ if (buffer_ordered(bh) && (rw & WRITE))
+ rw |= WRITE_BARRIER;
/*
- * Only clear out a write error when rewriting, should this
- * include WRITE_SYNC as well?
+ * Only clear out a write error when rewriting
*/
- if (test_set_buffer_req(bh) && (rw == WRITE || rw == WRITE_BARRIER))
+ if (test_set_buffer_req(bh) && (rw & WRITE))
clear_buffer_write_io_error(bh);
/*