[PATCH] device-mapper raid1: add default mirror
This patch introduces a new field to the mirror_set (default_mirror) to store
the default mirror.
(A subsequent patch will allow us to change the default mirror in the event of
a failure.)
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 6b0fc16..6cfa8d4 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -562,6 +562,8 @@
region_t nr_regions;
int in_sync;
+ struct mirror *default_mirror; /* Default mirror */
+
unsigned int nr_mirrors;
struct mirror mirror[0];
};
@@ -611,7 +613,7 @@
unsigned long flags = 0;
/* fill in the source */
- m = ms->mirror + DEFAULT_MIRROR;
+ m = ms->default_mirror;
from.bdev = m->dev->bdev;
from.sector = m->offset + region_to_sector(reg->rh, reg->key);
if (reg->key == (ms->nr_regions - 1)) {
@@ -627,7 +629,7 @@
/* fill in the destinations */
for (i = 0, dest = to; i < ms->nr_mirrors; i++) {
- if (i == DEFAULT_MIRROR)
+ if (&ms->mirror[i] == ms->default_mirror)
continue;
m = ms->mirror + i;
@@ -682,7 +684,7 @@
static struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector)
{
/* FIXME: add read balancing */
- return ms->mirror + DEFAULT_MIRROR;
+ return ms->default_mirror;
}
/*
@@ -709,7 +711,7 @@
if (rh_in_sync(&ms->rh, region, 0))
m = choose_mirror(ms, bio->bi_sector);
else
- m = ms->mirror + DEFAULT_MIRROR;
+ m = ms->default_mirror;
map_bio(ms, m, bio);
generic_make_request(bio);
@@ -833,7 +835,7 @@
rh_delay(&ms->rh, bio);
while ((bio = bio_list_pop(&nosync))) {
- map_bio(ms, ms->mirror + DEFAULT_MIRROR, bio);
+ map_bio(ms, ms->default_mirror, bio);
generic_make_request(bio);
}
}
@@ -900,6 +902,7 @@
ms->nr_mirrors = nr_mirrors;
ms->nr_regions = dm_sector_div_up(ti->len, region_size);
ms->in_sync = 0;
+ ms->default_mirror = &ms->mirror[DEFAULT_MIRROR];
if (rh_init(&ms->rh, ms, dl, region_size, ms->nr_regions)) {
ti->error = "dm-mirror: Error creating dirty region hash";
