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[PATCH] dm: mirror sector offset fix

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The device-mapper core does not perform any remapping of bios before passing
them to the targets.  If a particular mapping begins part-way into a device,
targets obtain the sector relative to the start of the mapping by subtracting
ti->begin.

The dm-raid1 target didn't do this everywhere: this patch fixes it, taking
care to subtract ti->begin exactly once for each bio.

[akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled]

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Neil Brown 2006-06-26 00:27:26 -07:00 • committed by Linus Torvalds
parent f0b0411536
commit e4c8b3ba34
1 changed files with 32 additions and 31 deletions
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63
drivers/md/dm-raid1.c
View file

@ -106,12 +106,42 @@ struct region {
struct bio_list delayed_bios;
};
/*-----------------------------------------------------------------
* Mirror set structures.
*---------------------------------------------------------------*/
struct mirror {
atomic_t error_count;
struct dm_dev *dev;
sector_t offset;
};
struct mirror_set {
struct dm_target *ti;
struct list_head list;
struct region_hash rh;
struct kcopyd_client *kcopyd_client;
spinlock_t lock; /* protects the next two lists */
struct bio_list reads;
struct bio_list writes;
/* recovery */
region_t nr_regions;
int in_sync;
struct mirror *default_mirror; /* Default mirror */
unsigned int nr_mirrors;
struct mirror mirror[0];
};
/*
* Conversion fns
*/
static inline region_t bio_to_region(struct region_hash *rh, struct bio *bio)
{
return bio->bi_sector >> rh->region_shift;
return (bio->bi_sector - rh->ms->ti->begin) >> rh->region_shift;
}
static inline sector_t region_to_sector(struct region_hash *rh, region_t region)
@ -539,35 +569,6 @@ static void rh_start_recovery(struct region_hash *rh)
wake();
}
/*-----------------------------------------------------------------
* Mirror set structures.
*---------------------------------------------------------------*/
struct mirror {
atomic_t error_count;
struct dm_dev *dev;
sector_t offset;
};
struct mirror_set {
struct dm_target *ti;
struct list_head list;
struct region_hash rh;
struct kcopyd_client *kcopyd_client;
spinlock_t lock; /* protects the next two lists */
struct bio_list reads;
struct bio_list writes;
/* recovery */
region_t nr_regions;
int in_sync;
struct mirror *default_mirror; /* Default mirror */
unsigned int nr_mirrors;
struct mirror mirror[0];
};
/*
* Every mirror should look like this one.
*/
@ -1113,7 +1114,7 @@ static int mirror_map(struct dm_target *ti, struct bio *bio,
struct mirror *m;
struct mirror_set *ms = ti->private;
map_context->ll = bio->bi_sector >> ms->rh.region_shift;
map_context->ll = bio_to_region(&ms->rh, bio);
if (rw == WRITE) {
queue_bio(ms, bio, rw);