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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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11
drivers/md/dm-round-robin.c
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@@ -17,6 +17,8 @@
#include <linux/module.h>
#define DM_MSG_PREFIX "multipath round-robin"
#define RR_MIN_IO 1
#define RR_VERSION "1.1.0"
/*-----------------------------------------------------------------
* Path-handling code, paths are held in lists
@@ -41,8 +43,6 @@ static void free_paths(struct list_head *paths)
* Round-robin selector
*---------------------------------------------------------------*/
#define RR_MIN_IO 1000
struct selector {
struct list_head valid_paths;
struct list_head invalid_paths;
@@ -127,6 +127,11 @@ static int rr_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 */
pi = kmalloc(sizeof(*pi), GFP_KERNEL);
if (!pi) {
@@ -198,7 +203,7 @@ static int __init dm_rr_init(void)
if (r < 0)
DMERR("register failed %d", r);
DMINFO("version 1.0.0 loaded");
DMINFO("version " RR_VERSION " loaded");
return r;
}