When RAID10 supports reshape it will need a 'previous' and a 'current'
geometry, so introduce that here.
Use the 'prev' geometry when before the reshape_position, and the
current 'geo' when beyond it. At other times, use both as
appropriate.
For now, both are identical (And reshape_position is never set).
When we use the 'prev' geometry, we must use the old data_offset.
When we use the current (And a reshape is happening) we must use
the new_data_offset.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid10.c | 106 ++++++++++++++++++++++++++++++++++++++++-----------
drivers/md/raid10.h | 8 +++-
2 files changed, 91 insertions(+), 23 deletions(-)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 39f5239..0a6746f 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -504,15 +504,13 @@ static void raid10_end_write_request(struct bio *bio, int error)
* sector offset to a virtual address
*/
-static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio)
+static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio)
{
int n,f;
sector_t sector;
sector_t chunk;
sector_t stripe;
int dev;
- struct geom *geo = &conf->geo;
-
int slot = 0;
/* now calculate first sector/dev */
@@ -550,12 +548,29 @@ static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio)
sector += (geo->chunk_mask + 1);
}
}
- BUG_ON(slot != conf->copies);
+}
+
+static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio)
+{
+ struct geom *geo = &conf->geo;
+
+ if (conf->reshape_progress != MaxSector &&
+ ((r10bio->sector >= conf->reshape_progress) !=
+ conf->mddev->reshape_backwards)) {
+ set_bit(R10BIO_Previous, &r10bio->state);
+ geo = &conf->prev;
+ } else
+ clear_bit(R10BIO_Previous, &r10bio->state);
+
+ __raid10_find_phys(geo, r10bio);
}
static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev)
{
sector_t offset, chunk, vchunk;
+ /* Never use conf->prev as this is only called during resync
+ * or recovery, so reshape isn't happening
+ */
struct geom *geo = &conf->geo;
offset = sector & geo->chunk_mask;
@@ -603,6 +618,11 @@ static int raid10_mergeable_bvec(struct request_queue *q,
unsigned int bio_sectors = bvm->bi_size >> 9;
struct geom *geo = &conf->geo;
+ if (conf->reshape_progress != MaxSector &&
+ ((sector >= conf->reshape_progress) !=
+ conf->mddev->reshape_backwards))
+ geo = &conf->prev;
+
if (geo->near_copies < geo->raid_disks) {
max = (chunk_sectors - ((sector & (chunk_sectors - 1))
+ bio_sectors)) << 9;
@@ -617,6 +637,12 @@ static int raid10_mergeable_bvec(struct request_queue *q,
if (mddev->merge_check_needed) {
struct r10bio r10_bio;
int s;
+ if (conf->reshape_progress != MaxSector) {
+ /* Cannot give any guidance during reshape */
+ if (max <= biovec->bv_len && bio_sectors == 0)
+ return biovec->bv_len;
+ return 0;
+ }
r10_bio.sector = sector;
raid10_find_phys(conf, &r10_bio);
rcu_read_lock();
@@ -816,7 +842,10 @@ static int raid10_congested(void *data, int bits)
if (mddev_congested(mddev, bits))
return 1;
rcu_read_lock();
- for (i = 0; i < conf->geo.raid_disks && ret == 0; i++) {
+ for (i = 0;
+ (i < conf->geo.raid_disks || i < conf->prev.raid_disks)
+ && ret == 0;
+ i++) {
struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags)) {
struct request_queue *q = bdev_get_queue(rdev->bdev);
@@ -977,13 +1006,23 @@ static void unfreeze_array(struct r10conf *conf)
spin_unlock_irq(&conf->resync_lock);
}
+static sector_t choose_data_offset(struct r10bio *r10_bio,
+ struct md_rdev *rdev)
+{
+ if (!test_bit(MD_RECOVERY_RESHAPE, &rdev->mddev->recovery) ||
+ test_bit(R10BIO_Previous, &r10_bio->state))
+ return rdev->data_offset;
+ else
+ return rdev->new_data_offset;
+}
+
static void make_request(struct mddev *mddev, struct bio * bio)
{
struct r10conf *conf = mddev->private;
struct r10bio *r10_bio;
struct bio *read_bio;
int i;
- sector_t chunk_mask = conf->geo.chunk_mask;
+ sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask);
int chunk_sects = chunk_mask + 1;
const int rw = bio_data_dir(bio);
const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
@@ -1004,7 +1043,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
*/
if (unlikely((bio->bi_sector & chunk_mask) + (bio->bi_size >> 9)
> chunk_sects
- && conf->geo.near_copies < conf->geo.raid_disks)) {
+ && (conf->geo.near_copies < conf->geo.raid_disks
+ || conf->prev.near_copies < conf->prev.raid_disks))) {
struct bio_pair *bp;
/* Sanity check -- queue functions should prevent this happening */
if (bio->bi_vcnt != 1 ||
@@ -1098,7 +1138,7 @@ read_again:
r10_bio->devs[slot].rdev = rdev;
read_bio->bi_sector = r10_bio->devs[slot].addr +
- rdev->data_offset;
+ choose_data_offset(r10_bio, rdev);
read_bio->bi_bdev = rdev->bdev;
read_bio->bi_end_io = raid10_end_read_request;
read_bio->bi_rw = READ | do_sync;
@@ -1302,7 +1342,8 @@ retry_write:
r10_bio->devs[i].bio = mbio;
mbio->bi_sector = (r10_bio->devs[i].addr+
- conf->mirrors[d].rdev->data_offset);
+ choose_data_offset(r10_bio,
+ conf->mirrors[d].rdev));
mbio->bi_bdev = conf->mirrors[d].rdev->bdev;
mbio->bi_end_io = raid10_end_write_request;
mbio->bi_rw = WRITE | do_sync | do_fua;
@@ -1326,8 +1367,10 @@ retry_write:
* so it cannot disappear, so the replacement cannot
* become NULL here
*/
- mbio->bi_sector = (r10_bio->devs[i].addr+
- conf->mirrors[d].replacement->data_offset);
+ mbio->bi_sector = (r10_bio->devs[i].addr +
+ choose_data_offset(
+ r10_bio,
+ conf->mirrors[d].replacement));
mbio->bi_bdev = conf->mirrors[d].replacement->bdev;
mbio->bi_end_io = raid10_end_write_request;
mbio->bi_rw = WRITE | do_sync | do_fua;
@@ -1397,7 +1440,7 @@ static void status(struct seq_file *seq, struct mddev *mddev)
* Don't consider the device numbered 'ignore'
* as we might be about to remove it.
*/
-static int enough(struct r10conf *conf, int ignore)
+static int _enough(struct r10conf *conf, struct geom *geo, int ignore)
{
int first = 0;
@@ -1408,7 +1451,7 @@ static int enough(struct r10conf *conf, int ignore)
if (conf->mirrors[first].rdev &&
first != ignore)
cnt++;
- first = (first+1) % conf->geo.raid_disks;
+ first = (first+1) % geo->raid_disks;
}
if (cnt == 0)
return 0;
@@ -1416,6 +1459,12 @@ static int enough(struct r10conf *conf, int ignore)
return 1;
}
+static int enough(struct r10conf *conf, int ignore)
+{
+ return _enough(conf, &conf->geo, ignore) &&
+ _enough(conf, &conf->prev, ignore);
+}
+
static void error(struct mddev *mddev, struct md_rdev *rdev)
{
char b[BDEVNAME_SIZE];
@@ -2223,7 +2272,9 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(
- sect + rdev->data_offset),
+ sect +
+ choose_data_offset(r10_bio,
+ rdev)),
bdevname(rdev->bdev, b));
printk(KERN_NOTICE "md/raid10:%s: %s: failing "
"drive\n",
@@ -2261,7 +2312,8 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(
- sect + rdev->data_offset),
+ sect +
+ choose_data_offset(r10_bio, rdev)),
bdevname(rdev->bdev, b));
printk(KERN_NOTICE "md/raid10:%s: %s: failing "
"drive\n",
@@ -2274,7 +2326,8 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(
- sect + rdev->data_offset),
+ sect +
+ choose_data_offset(r10_bio, rdev)),
bdevname(rdev->bdev, b));
atomic_add(s, &rdev->corrected_errors);
}
@@ -2348,7 +2401,7 @@ static int narrow_write_error(struct r10bio *r10_bio, int i)
wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
md_trim_bio(wbio, sector - bio->bi_sector, sectors);
wbio->bi_sector = (r10_bio->devs[i].addr+
- rdev->data_offset+
+ choose_data_offset(r10_bio, rdev) +
(sector - r10_bio->sector));
wbio->bi_bdev = rdev->bdev;
if (submit_bio_wait(WRITE, wbio) == 0)
@@ -2425,7 +2478,7 @@ read_more:
r10_bio->devs[slot].bio = bio;
r10_bio->devs[slot].rdev = rdev;
bio->bi_sector = r10_bio->devs[slot].addr
- + rdev->data_offset;
+ + choose_data_offset(r10_bio, rdev);
bio->bi_bdev = rdev->bdev;
bio->bi_rw = READ | do_sync;
bio->bi_private = r10_bio;
@@ -3246,7 +3299,8 @@ static struct r10conf *setup_conf(struct mddev *mddev)
else
sector_div(stride, fc);
conf->geo.stride = stride << conf->geo.chunk_shift;
-
+ conf->prev = conf->geo;
+ conf->reshape_progress = MaxSector;
spin_lock_init(&conf->device_lock);
INIT_LIST_HEAD(&conf->retry_list);
@@ -3312,8 +3366,10 @@ static int run(struct mddev *mddev)
rdev_for_each(rdev, mddev) {
disk_idx = rdev->raid_disk;
- if (disk_idx >= conf->geo.raid_disks
- || disk_idx < 0)
+ if (disk_idx < 0)
+ continue;
+ if (disk_idx >= conf->geo.raid_disks &&
+ disk_idx >= conf->prev.raid_disks)
continue;
disk = conf->mirrors + disk_idx;
@@ -3340,7 +3396,10 @@ static int run(struct mddev *mddev)
}
mddev->degraded = 0;
- for (i = 0; i < conf->geo.raid_disks; i++) {
+ for (i = 0;
+ i < conf->geo.raid_disks
+ || i < conf->prev.raid_disks;
+ i++) {
disk = conf->mirrors + i;
@@ -3459,6 +3518,9 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors)
struct r10conf *conf = mddev->private;
sector_t oldsize, size;
+ if (mddev->reshape_position != MaxSector)
+ return -EBUSY;
+
if (conf->geo.far_copies > 1 && !conf->geo.far_offset)
return -EINVAL;
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 4c4942a..37509d7 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -34,13 +34,14 @@ struct r10conf {
*/
int chunk_shift; /* shift from chunks to sectors */
sector_t chunk_mask;
- } geo;
+ } prev, geo;
int copies; /* near_copies * far_copies.
* must be <= raid_disks
*/
sector_t dev_sectors; /* temp copy of
* mddev->dev_sectors */
+ sector_t reshape_progress;
struct list_head retry_list;
/* queue pending writes and submit them on unplug */
@@ -147,5 +148,10 @@ enum r10bio_state {
*/
R10BIO_MadeGood,
R10BIO_WriteError,
+/* During a reshape we might be performing IO on the
+ * 'previous' part of the array, in which case this
+ * flag is set
+ */
+ R10BIO_Previous,
};
#endif
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