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dm mpath: remove extra nesting in map function

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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>
This commit is contained in:
Mike Snitzer
2014-02-28 15:33:48 +01:00
parent 36fcffcc65
commit 9bf59a611a
1 changed files with 24 additions and 22 deletions
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drivers/md/dm-mpath.c
+9 -7
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@@ -398,8 +398,15 @@ static int multipath_map(struct dm_target *ti, struct request *clone,
pgpath = m->current_pgpath;
if (pgpath) {
if (pg_ready(m)) {
if (!pgpath) {
if (!__must_push_back(m))
r = -EIO; /* Failed */
goto out_unlock;
}
if (!pg_ready(m)) {
__pg_init_all_paths(m);
goto out_unlock;
}
if (set_mapinfo(m, map_context) < 0)
/* ENOMEM, requeue */
goto out_unlock;
@@ -416,11 +423,6 @@ static int multipath_map(struct dm_target *ti, struct request *clone,
&pgpath->path,
nr_bytes);
r = DM_MAPIO_REMAPPED;
goto out_unlock;
}
__pg_init_all_paths(m);
} else if (!__must_push_back(m))
r = -EIO; /* Failed */
out_unlock:
spin_unlock_irqrestore(&m->lock, flags);