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dm mpath: remove harmful bio-based optimization 

Removes the branching for edge-case where no SCSI device handler
exists.  The __map_bio_fast() method was far too limited, by only
selecting a new pathgroup or path IFF there was a path failure, fix this
be eliminating it in favor of __map_bio().  __map_bio()'s extra SCSI
device handler specific MPATHF_PG_INIT_REQUIRED test is not in the fast
path anyway.

This change restores full path selector functionality for bio-based
configurations that don't haave a SCSI device handler.  But it should be
noted that the path selectors do have an impact on performance for
certain networks that are extremely fast (and don't require frequent
switching).

Fixes: 8d47e65948 ("dm mpath: remove unnecessary NVMe branching in favor of scsi_dh checks")
Cc: stable@vger.kernel.org
Reported-by: Drew Hastings <dhastings@crucialwebhost.com>
Suggested-by: Martin Wilck <mwilck@suse.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2019-11-26 10:08:29 -05:00
parent f612b2132d
commit dbaf971c9c
1 changed files with 1 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/md/dm-mpath.c
View File

@ -599,45 +599,10 @@ static struct pgpath *__map_bio(struct multipath *m, struct bio *bio)
return pgpath;
}
static struct pgpath *__map_bio_fast(struct multipath *m, struct bio *bio)
{
struct pgpath *pgpath;
unsigned long flags;
/* Do we need to select a new pgpath? */
/*
* FIXME: currently only switching path if no path (due to failure, etc)
* - which negates the point of using a path selector
*/
pgpath = READ_ONCE(m->current_pgpath);
if (!pgpath)
pgpath = choose_pgpath(m, bio->bi_iter.bi_size);
if (!pgpath) {
if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) {
/* Queue for the daemon to resubmit */
spin_lock_irqsave(&m->lock, flags);
bio_list_add(&m->queued_bios, bio);
spin_unlock_irqrestore(&m->lock, flags);
queue_work(kmultipathd, &m->process_queued_bios);
return ERR_PTR(-EAGAIN);
}
return NULL;
}
return pgpath;
}
static int __multipath_map_bio(struct multipath *m, struct bio *bio,
struct dm_mpath_io *mpio)
{
struct pgpath *pgpath;
if (!m->hw_handler_name)
pgpath = __map_bio_fast(m, bio);
else
pgpath = __map_bio(m, bio);
struct pgpath *pgpath = __map_bio(m, bio);
if (IS_ERR(pgpath))
return DM_MAPIO_SUBMITTED;