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.)
From: Jonathan E Brassow <[email protected]>
Signed-Off-By: Alasdair G Kergon <[email protected]>
Index: linux-2.6.14/drivers/md/dm-raid1.c
===================================================================
--- linux-2.6.14.orig/drivers/md/dm-raid1.c 2005-11-18 20:01:05.000000000 +0000
+++ linux-2.6.14/drivers/md/dm-raid1.c 2005-11-18 20:01:26.000000000 +0000
@@ -562,6 +562,8 @@ struct mirror_set {
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 @@ static int recover(struct mirror_set *ms
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 @@ static int recover(struct mirror_set *ms
/* 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 void do_recovery(struct mirror_se
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 @@ static void do_reads(struct mirror_set *
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 @@ static void do_writes(struct mirror_set
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 @@ static struct mirror_set *alloc_context(
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";
-
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