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dm mpath: remove repeat_count support from multipath core

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Preparation for making __multipath_map() avoid taking the m->lock
spinlock -- in favor of using RCU locking.

repeat_count was primarily for bio-based DM multipath's benefit.  There
is really no need for it anymore now that DM multipath is request-based.
As such, repeat_count > 1 is no longer honored and a warning is
displayed if the user attempts to use a value > 1.  This is a temporary
change for the round-robin path-selector (as a later commit will restore
its support for repeat_count > 1).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
2016-02-10 11:58:45 -05:00
parent 7943bd6dd3
commit 21136f89d7
4 changed files with 24 additions and 10 deletions
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9
drivers/md/dm-queue-length.c
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@@ -23,8 +23,8 @@
#include <linux/atomic.h>
#define DM_MSG_PREFIX "multipath queue-length"
#define QL_MIN_IO 128
#define QL_VERSION "0.1.0"
#define QL_MIN_IO 1
#define QL_VERSION "0.2.0"
struct selector {
struct list_head valid_paths;
@@ -129,6 +129,11 @@ static int ql_add_path(struct path_selector *ps, struct dm_path *path,
return -EINVAL;
}
if (repeat_count > 1) {
DMWARN_LIMIT("repeat_count > 1 is deprecated, using 1 instead");
repeat_count = 1;
}
/* Allocate the path information structure */
pi = kmalloc(sizeof(*pi), GFP_KERNEL);
if (!pi) {