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authorMike Snitzer <snitzer@redhat.com>2016-02-10 19:58:45 +0300
committerMike Snitzer <snitzer@redhat.com>2016-02-23 06:34:40 +0300
commit21136f89d76dc10d31d294f2bb79c585a039bad6 (patch)
tree6d1fe59d7561962f7f661d2cdd0e1e1d9a617347 /drivers/md/dm-queue-length.c
parent7943bd6dd3e71b9e3679bcd254206d86083e1df2 (diff)
downloadlinux-21136f89d76dc10d31d294f2bb79c585a039bad6.tar.xz
dm mpath: remove repeat_count support from multipath core
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>
Diffstat (limited to 'drivers/md/dm-queue-length.c')
-rw-r--r--drivers/md/dm-queue-length.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/md/dm-queue-length.c b/drivers/md/dm-queue-length.c
index 3941fae0de9f..51d82290ad4c 100644
--- a/drivers/md/dm-queue-length.c
+++ b/drivers/md/dm-queue-length.c
@@ -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) {