diff options
| author | Jonathan E Brassow <jbrassow@redhat.com> | 2006-01-06 08:20:05 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 16:34:00 (GMT) |
| commit | a1a190807074bd6ad8771e00b00752771ae586cb (patch) | |
| tree | ea9df244d215722e422f7bd7560dd9fe59789f44 | |
| parent | 2d5fe68987341a59a3fd97c71695efcabb0c6fd5 (diff) | |
| download | linux-a1a190807074bd6ad8771e00b00752771ae586cb.tar.xz | |
[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>
| -rw-r--r-- | drivers/md/dm-raid1.c | 13 |
1 files changed, 8 insertions, 5 deletions
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 @@ 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, struct region *reg) 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, struct region *reg) /* 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_set *ms) 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 *ms, struct bio_list *reads) 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 *ms, struct bio_list *writes) 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(unsigned int nr_mirrors, 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"; |