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| author | Mike Snitzer <snitzer@redhat.com> | 2016-02-10 11:58:45 -0500 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-02-22 22:34:40 -0500 |
| commit | 21136f89d76dc10d31d294f2bb79c585a039bad6 (patch) | |
| tree | 6d1fe59d7561962f7f661d2cdd0e1e1d9a617347 /drivers/md/dm-queue-length.c | |
| parent | 7943bd6dd3e71b9e3679bcd254206d86083e1df2 (diff) | |
| download | lwn-21136f89d76dc10d31d294f2bb79c585a039bad6.tar.gz lwn-21136f89d76dc10d31d294f2bb79c585a039bad6.zip | |
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.c | 9 |
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) { |