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Subject[patch 16/37] dm: mirror sector offset fix
-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Neil Brown <neilb@suse.de>

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

drivers/md/dm-raid1.c | 63 +++++++++++++++++++++++++-------------------------
1 file changed, 32 insertions(+), 31 deletions(-)

--- linux-2.6.17.11.orig/drivers/md/dm-raid1.c
+++ linux-2.6.17.11/drivers/md/dm-raid1.c
@@ -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)
@@ -541,35 +571,6 @@ static void rh_start_recovery(struct reg
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.
*/
@@ -1115,7 +1116,7 @@ static int mirror_map(struct dm_target *
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);
--
-
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