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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-08-22 10:00:36 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-08-27 09:50:19 +0200 |
| commit | 48fd4f93a00eac844678629f2f00518e146ed30d (patch) | |
| tree | c71f6792742886db9912078c70b3e8806e9f260f /fs | |
| parent | a4a778971b9cfcbedb8648ba502d801f7db04c47 (diff) | |
| download | lwn-48fd4f93a00eac844678629f2f00518e146ed30d.tar.gz lwn-48fd4f93a00eac844678629f2f00518e146ed30d.zip | |
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')
| -rw-r--r-- | fs/buffer.c | 13 |
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); /* |