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| author | Mike Snitzer <snitzer@redhat.com> | 2014-02-28 15:33:48 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2014-03-27 16:56:25 -0400 |
| commit | 9bf59a611a5eb479f321fae34adc9f948de0a42f (patch) | |
| tree | 0ad88aa4377521d9c082b1a5251e00fa01bd987d /drivers/md/dm-mpath.c | |
| parent | 36fcffcc6500228efdfaf3a36761dd57a38366e3 (diff) | |
| download | linux-9bf59a611a5eb479f321fae34adc9f948de0a42f.tar.gz linux-9bf59a611a5eb479f321fae34adc9f948de0a42f.tar.bz2 linux-9bf59a611a5eb479f321fae34adc9f948de0a42f.zip | |
dm mpath: remove extra nesting in map function
Return early for case when no path exists, and when the
pathgroup isn't ready. This eliminates the need for
extra nesting for the the common case.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Diffstat (limited to 'drivers/md/dm-mpath.c')
| -rw-r--r-- | drivers/md/dm-mpath.c | 46 |
1 files changed, 24 insertions, 22 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 07ca77f29438..e7d80baf8d69 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -398,29 +398,31 @@ static int multipath_map(struct dm_target *ti, struct request *clone, pgpath = m->current_pgpath; - if (pgpath) { - if (pg_ready(m)) { - if (set_mapinfo(m, map_context) < 0) - /* ENOMEM, requeue */ - goto out_unlock; - - bdev = pgpath->path.dev->bdev; - clone->q = bdev_get_queue(bdev); - clone->rq_disk = bdev->bd_disk; - clone->cmd_flags |= REQ_FAILFAST_TRANSPORT; - mpio = map_context->ptr; - mpio->pgpath = pgpath; - mpio->nr_bytes = nr_bytes; - if (pgpath->pg->ps.type->start_io) - pgpath->pg->ps.type->start_io(&pgpath->pg->ps, - &pgpath->path, - nr_bytes); - r = DM_MAPIO_REMAPPED; - goto out_unlock; - } + if (!pgpath) { + if (!__must_push_back(m)) + r = -EIO; /* Failed */ + goto out_unlock; + } + if (!pg_ready(m)) { __pg_init_all_paths(m); - } else if (!__must_push_back(m)) - r = -EIO; /* Failed */ + goto out_unlock; + } + if (set_mapinfo(m, map_context) < 0) + /* ENOMEM, requeue */ + goto out_unlock; + + bdev = pgpath->path.dev->bdev; + clone->q = bdev_get_queue(bdev); + clone->rq_disk = bdev->bd_disk; + clone->cmd_flags |= REQ_FAILFAST_TRANSPORT; + mpio = map_context->ptr; + mpio->pgpath = pgpath; + mpio->nr_bytes = nr_bytes; + if (pgpath->pg->ps.type->start_io) + pgpath->pg->ps.type->start_io(&pgpath->pg->ps, + &pgpath->path, + nr_bytes); + r = DM_MAPIO_REMAPPED; out_unlock: spin_unlock_irqrestore(&m->lock, flags); |