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[PATCH] dm: Handle READA requests in dm-mpath.c 

READA errors failing with EWOULDBLOCK/EAGAIN do not constitute a valid
reason for failing the path; this lead to erratic errors on DM multipath
devices.  This error can be safely propagated upwards without failing the
path.

Acked-by: Kevin Corry <kevcorry@us.ibm.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Lars Marowsky-Bree <lmb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Lars Marowsky-Bree 2005-06-08 15:50:31 -07:00 committed by Linus Torvalds
parent 05062d96a2
commit 4f58802fae
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm-mpath.c
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@ -985,6 +985,9 @@ static int do_end_io(struct multipath *m, struct bio *bio,
if (!error)
return 0; /* I/O complete */
if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
return error;
spin_lock(&m->lock);
if (!m->nr_valid_paths) {
if (!m->queue_if_no_path || m->suspended) {