In RAID1, a replacement is much like a normal device, so we just
double the size of the relevant arrays and look at all possible
devices for reads and writes.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid1.c | 58 +++++++++++++++++++++++++++-------------------------
drivers/md/raid1.h | 7 +++++-
2 files changed, 36 insertions(+), 29 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 74d4ce5..99cd12e 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -134,7 +134,7 @@ out_free_pages:
put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
- while ( ++j < pi->raid_disks )
+ while (++j < pi->raid_disks)
bio_put(r1_bio->bios[j]);
r1bio_pool_free(r1_bio, data);
return NULL;
@@ -163,7 +163,7 @@ static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio)
{
int i;
- for (i = 0; i < conf->raid_disks; i++) {
+ for (i = 0; i < conf->raid_disks * 2; i++) {
struct bio **bio = r1_bio->bios + i;
if (!BIO_SPECIAL(*bio))
bio_put(*bio);
@@ -184,7 +184,7 @@ static void put_buf(struct r1bio *r1_bio)
struct r1conf *conf = r1_bio->mddev->private;
int i;
- for (i=0; i<conf->raid_disks; i++) {
+ for (i = 0; i < conf->raid_disks * 2; i++) {
struct bio *bio = r1_bio->bios[i];
if (bio->bi_end_io)
rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev);
@@ -279,11 +279,11 @@ static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio)
struct r1conf *conf = r1_bio->mddev->private;
int raid_disks = conf->raid_disks;
- for (mirror = 0; mirror < raid_disks; mirror++)
+ for (mirror = 0; mirror < raid_disks * 2; mirror++)
if (r1_bio->bios[mirror] == bio)
break;
- BUG_ON(mirror == raid_disks);
+ BUG_ON(mirror == raid_disks * 2);
update_head_pos(mirror, r1_bio);
return mirror;
@@ -505,7 +505,7 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
start_disk = conf->last_used;
}
- for (i = 0 ; i < conf->raid_disks ; i++) {
+ for (i = 0 ; i < conf->raid_disks * 2 ; i++) {
sector_t dist;
sector_t first_bad;
int bad_sectors;
@@ -974,7 +974,7 @@ read_again:
*/
plugged = mddev_check_plugged(mddev);
- disks = conf->raid_disks;
+ disks = conf->raid_disks * 2;
retry_write:
blocked_rdev = NULL;
rcu_read_lock();
@@ -1494,7 +1494,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
}
}
d++;
- if (d == conf->raid_disks)
+ if (d == conf->raid_disks * 2)
d = 0;
} while (!success && d != r1_bio->read_disk);
@@ -1511,7 +1511,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
mdname(mddev),
bdevname(bio->bi_bdev, b),
(unsigned long long)r1_bio->sector);
- for (d = 0; d < conf->raid_disks; d++) {
+ for (d = 0; d < conf->raid_disks * 2; d++) {
rdev = conf->mirrors[d].rdev;
if (!rdev || test_bit(Faulty, &rdev->flags))
continue;
@@ -1537,7 +1537,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
/* write it back and re-read */
while (d != r1_bio->read_disk) {
if (d == 0)
- d = conf->raid_disks;
+ d = conf->raid_disks * 2;
d--;
if (r1_bio->bios[d]->bi_end_io != end_sync_read)
continue;
@@ -1552,7 +1552,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio)
d = start;
while (d != r1_bio->read_disk) {
if (d == 0)
- d = conf->raid_disks;
+ d = conf->raid_disks * 2;
d--;
if (r1_bio->bios[d]->bi_end_io != end_sync_read)
continue;
@@ -1585,7 +1585,7 @@ static int process_checks(struct r1bio *r1_bio)
int primary;
int i;
- for (primary = 0; primary < conf->raid_disks; primary++)
+ for (primary = 0; primary < conf->raid_disks * 2; primary++)
if (r1_bio->bios[primary]->bi_end_io == end_sync_read &&
test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) {
r1_bio->bios[primary]->bi_end_io = NULL;
@@ -1593,7 +1593,7 @@ static int process_checks(struct r1bio *r1_bio)
break;
}
r1_bio->read_disk = primary;
- for (i = 0; i < conf->raid_disks; i++) {
+ for (i = 0; i < conf->raid_disks * 2; i++) {
int j;
int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9);
struct bio *pbio = r1_bio->bios[primary];
@@ -1657,7 +1657,7 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
{
struct r1conf *conf = mddev->private;
int i;
- int disks = conf->raid_disks;
+ int disks = conf->raid_disks * 2;
struct bio *bio, *wbio;
bio = r1_bio->bios[r1_bio->read_disk];
@@ -1738,7 +1738,7 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
success = 1;
else {
d++;
- if (d == conf->raid_disks)
+ if (d == conf->raid_disks * 2)
d = 0;
}
} while (!success && d != read_disk);
@@ -1754,7 +1754,7 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
start = d;
while (d != read_disk) {
if (d==0)
- d = conf->raid_disks;
+ d = conf->raid_disks * 2;
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
@@ -1766,7 +1766,7 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
while (d != read_disk) {
char b[BDEVNAME_SIZE];
if (d==0)
- d = conf->raid_disks;
+ d = conf->raid_disks * 2;
d--;
rdev = conf->mirrors[d].rdev;
if (rdev &&
@@ -1888,7 +1888,7 @@ static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio
{
int m;
int s = r1_bio->sectors;
- for (m = 0; m < conf->raid_disks ; m++) {
+ for (m = 0; m < conf->raid_disks * 2 ; m++) {
struct md_rdev *rdev = conf->mirrors[m].rdev;
struct bio *bio = r1_bio->bios[m];
if (bio->bi_end_io == NULL)
@@ -1910,7 +1910,7 @@ static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio
static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio)
{
int m;
- for (m = 0; m < conf->raid_disks ; m++)
+ for (m = 0; m < conf->raid_disks * 2 ; m++)
if (r1_bio->bios[m] == IO_MADE_GOOD) {
struct md_rdev *rdev = conf->mirrors[m].rdev;
rdev_clear_badblocks(rdev,
@@ -2185,7 +2185,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
r1_bio->state = 0;
set_bit(R1BIO_IsSync, &r1_bio->state);
- for (i=0; i < conf->raid_disks; i++) {
+ for (i = 0; i < conf->raid_disks * 2; i++) {
struct md_rdev *rdev;
bio = r1_bio->bios[i];
@@ -2256,7 +2256,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
* need to mark them bad on all write targets
*/
int ok = 1;
- for (i = 0 ; i < conf->raid_disks ; i++)
+ for (i = 0 ; i < conf->raid_disks * 2 ; i++)
if (r1_bio->bios[i]->bi_end_io == end_sync_write) {
struct md_rdev *rdev =
rcu_dereference(conf->mirrors[i].rdev);
@@ -2325,7 +2325,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
len = sync_blocks<<9;
}
- for (i=0 ; i < conf->raid_disks; i++) {
+ for (i = 0 ; i < conf->raid_disks * 2; i++) {
bio = r1_bio->bios[i];
if (bio->bi_end_io) {
page = bio->bi_io_vec[bio->bi_vcnt].bv_page;
@@ -2358,7 +2358,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
*/
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
atomic_set(&r1_bio->remaining, read_targets);
- for (i=0; i<conf->raid_disks; i++) {
+ for (i = 0; i < conf->raid_disks * 2; i++) {
bio = r1_bio->bios[i];
if (bio->bi_end_io == end_sync_read) {
md_sync_acct(bio->bi_bdev, nr_sectors);
@@ -2395,7 +2395,8 @@ static struct r1conf *setup_conf(struct mddev *mddev)
if (!conf)
goto abort;
- conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
+ conf->mirrors = kzalloc(sizeof(struct mirror_info)
+ * mddev->raid_disks * 2,
GFP_KERNEL);
if (!conf->mirrors)
goto abort;
@@ -2407,7 +2408,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
if (!conf->poolinfo)
goto abort;
- conf->poolinfo->raid_disks = mddev->raid_disks;
+ conf->poolinfo->raid_disks = mddev->raid_disks * 2;
conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
r1bio_pool_free,
conf->poolinfo);
@@ -2440,7 +2441,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
conf->recovery_disabled = mddev->recovery_disabled - 1;
conf->last_used = -1;
- for (i = 0; i < conf->raid_disks; i++) {
+ for (i = 0; i < conf->raid_disks * 2; i++) {
disk = conf->mirrors + i;
@@ -2667,7 +2668,7 @@ static int raid1_reshape(struct mddev *mddev)
if (!newpoolinfo)
return -ENOMEM;
newpoolinfo->mddev = mddev;
- newpoolinfo->raid_disks = raid_disks;
+ newpoolinfo->raid_disks = raid_disks * 2;
newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
r1bio_pool_free, newpoolinfo);
@@ -2675,7 +2676,8 @@ static int raid1_reshape(struct mddev *mddev)
kfree(newpoolinfo);
return -ENOMEM;
}
- newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL);
+ newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks * 2,
+ GFP_KERNEL);
if (!newmirrors) {
kfree(newpoolinfo);
mempool_destroy(newpool);
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index c732b6c..80ded13 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -12,6 +12,9 @@ struct mirror_info {
* pool was allocated for, so they know how much to allocate and free.
* mddev->raid_disks cannot be used, as it can change while a pool is active
* These two datums are stored in a kmalloced struct.
+ * The 'raid_disks' here is twice the raid_disks in r1conf.
+ * This allows space for each 'real' device can have a replacement in the
+ * second half of the array.
*/
struct pool_info {
@@ -21,7 +24,9 @@ struct pool_info {
struct r1conf {
struct mddev *mddev;
- struct mirror_info *mirrors;
+ struct mirror_info *mirrors; /* twice 'raid_disks' to
+ * allow for replacements.
+ */
int raid_disks;
/* When choose the best device for a read (read_balance())
--
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