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-rw-r--r--drivers/md/raid10.c544
1 files changed, 420 insertions, 124 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 713dc9c..9e658e5 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -18,7 +18,9 @@
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include "dm-bio-list.h"
#include <linux/raid/raid10.h>
+#include <linux/raid/bitmap.h>
/*
* RAID10 provides a combination of RAID0 and RAID1 functionality.
@@ -47,6 +49,9 @@
static void unplug_slaves(mddev_t *mddev);
+static void allow_barrier(conf_t *conf);
+static void lower_barrier(conf_t *conf);
+
static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
{
conf_t *conf = data;
@@ -54,10 +59,8 @@ static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
int size = offsetof(struct r10bio_s, devs[conf->copies]);
/* allocate a r10bio with room for raid_disks entries in the bios array */
- r10_bio = kmalloc(size, gfp_flags);
- if (r10_bio)
- memset(r10_bio, 0, size);
- else
+ r10_bio = kzalloc(size, gfp_flags);
+ if (!r10_bio)
unplug_slaves(conf->mddev);
return r10_bio;
@@ -129,10 +132,10 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
out_free_pages:
for ( ; i > 0 ; i--)
- __free_page(bio->bi_io_vec[i-1].bv_page);
+ safe_put_page(bio->bi_io_vec[i-1].bv_page);
while (j--)
for (i = 0; i < RESYNC_PAGES ; i++)
- __free_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
+ safe_put_page(r10_bio->devs[j].bio->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
while ( ++j < nalloc )
@@ -152,7 +155,7 @@ static void r10buf_pool_free(void *__r10_bio, void *data)
struct bio *bio = r10bio->devs[j].bio;
if (bio) {
for (i = 0; i < RESYNC_PAGES; i++) {
- __free_page(bio->bi_io_vec[i].bv_page);
+ safe_put_page(bio->bi_io_vec[i].bv_page);
bio->bi_io_vec[i].bv_page = NULL;
}
bio_put(bio);
@@ -167,7 +170,7 @@ static void put_all_bios(conf_t *conf, r10bio_t *r10_bio)
for (i = 0; i < conf->copies; i++) {
struct bio **bio = & r10_bio->devs[i].bio;
- if (*bio)
+ if (*bio && *bio != IO_BLOCKED)
bio_put(*bio);
*bio = NULL;
}
@@ -175,20 +178,13 @@ static void put_all_bios(conf_t *conf, r10bio_t *r10_bio)
static inline void free_r10bio(r10bio_t *r10_bio)
{
- unsigned long flags;
-
conf_t *conf = mddev_to_conf(r10_bio->mddev);
/*
* Wake up any possible resync thread that waits for the device
* to go idle.
*/
- spin_lock_irqsave(&conf->resync_lock, flags);
- if (!--conf->nr_pending) {
- wake_up(&conf->wait_idle);
- wake_up(&conf->wait_resume);
- }
- spin_unlock_irqrestore(&conf->resync_lock, flags);
+ allow_barrier(conf);
put_all_bios(conf, r10_bio);
mempool_free(r10_bio, conf->r10bio_pool);
@@ -197,22 +193,10 @@ static inline void free_r10bio(r10bio_t *r10_bio)
static inline void put_buf(r10bio_t *r10_bio)
{
conf_t *conf = mddev_to_conf(r10_bio->mddev);
- unsigned long flags;
mempool_free(r10_bio, conf->r10buf_pool);
- spin_lock_irqsave(&conf->resync_lock, flags);
- if (!conf->barrier)
- BUG();
- --conf->barrier;
- wake_up(&conf->wait_resume);
- wake_up(&conf->wait_idle);
-
- if (!--conf->nr_pending) {
- wake_up(&conf->wait_idle);
- wake_up(&conf->wait_resume);
- }
- spin_unlock_irqrestore(&conf->resync_lock, flags);
+ lower_barrier(conf);
}
static void reschedule_retry(r10bio_t *r10_bio)
@@ -223,6 +207,7 @@ static void reschedule_retry(r10bio_t *r10_bio)
spin_lock_irqsave(&conf->device_lock, flags);
list_add(&r10_bio->retry_list, &conf->retry_list);
+ conf->nr_queued ++;
spin_unlock_irqrestore(&conf->device_lock, flags);
md_wakeup_thread(mddev->thread);
@@ -268,9 +253,9 @@ static int raid10_end_read_request(struct bio *bio, unsigned int bytes_done, int
/*
* this branch is our 'one mirror IO has finished' event handler:
*/
- if (!uptodate)
- md_error(r10_bio->mddev, conf->mirrors[dev].rdev);
- else
+ update_head_pos(slot, r10_bio);
+
+ if (uptodate) {
/*
* Set R10BIO_Uptodate in our master bio, so that
* we will return a good error code to the higher
@@ -281,15 +266,8 @@ static int raid10_end_read_request(struct bio *bio, unsigned int bytes_done, int
* wait for the 'master' bio.
*/
set_bit(R10BIO_Uptodate, &r10_bio->state);
-
- update_head_pos(slot, r10_bio);
-
- /*
- * we have only one bio on the read side
- */
- if (uptodate)
raid_end_bio_io(r10_bio);
- else {
+ } else {
/*
* oops, read error:
*/
@@ -322,9 +300,11 @@ static int raid10_end_write_request(struct bio *bio, unsigned int bytes_done, in
/*
* this branch is our 'one mirror IO has finished' event handler:
*/
- if (!uptodate)
+ if (!uptodate) {
md_error(r10_bio->mddev, conf->mirrors[dev].rdev);
- else
+ /* an I/O failed, we can't clear the bitmap */
+ set_bit(R10BIO_Degraded, &r10_bio->state);
+ } else
/*
* Set R10BIO_Uptodate in our master bio, so that
* we will return a good error code for to the higher
@@ -344,6 +324,11 @@ static int raid10_end_write_request(struct bio *bio, unsigned int bytes_done, in
* already.
*/
if (atomic_dec_and_test(&r10_bio->remaining)) {
+ /* clear the bitmap if all writes complete successfully */
+ bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,
+ r10_bio->sectors,
+ !test_bit(R10BIO_Degraded, &r10_bio->state),
+ 0);
md_write_end(r10_bio->mddev);
raid_end_bio_io(r10_bio);
}
@@ -502,8 +487,9 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
rcu_read_lock();
/*
* Check if we can balance. We can balance on the whole
- * device if no resync is going on, or below the resync window.
- * We take the first readable disk when above the resync window.
+ * device if no resync is going on (recovery is ok), or below
+ * the resync window. We take the first readable disk when
+ * above the resync window.
*/
if (conf->mddev->recovery_cp < MaxSector
&& (this_sector + sectors >= conf->next_resync)) {
@@ -512,6 +498,7 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
disk = r10_bio->devs[slot].devnum;
while ((rdev = rcu_dereference(conf->mirrors[disk].rdev)) == NULL ||
+ r10_bio->devs[slot].bio == IO_BLOCKED ||
!test_bit(In_sync, &rdev->flags)) {
slot++;
if (slot == conf->copies) {
@@ -529,6 +516,7 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
slot = 0;
disk = r10_bio->devs[slot].devnum;
while ((rdev=rcu_dereference(conf->mirrors[disk].rdev)) == NULL ||
+ r10_bio->devs[slot].bio == IO_BLOCKED ||
!test_bit(In_sync, &rdev->flags)) {
slot ++;
if (slot == conf->copies) {
@@ -549,6 +537,7 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
if ((rdev=rcu_dereference(conf->mirrors[ndisk].rdev)) == NULL ||
+ r10_bio->devs[nslot].bio == IO_BLOCKED ||
!test_bit(In_sync, &rdev->flags))
continue;
@@ -607,7 +596,10 @@ static void unplug_slaves(mddev_t *mddev)
static void raid10_unplug(request_queue_t *q)
{
+ mddev_t *mddev = q->queuedata;
+
unplug_slaves(q->queuedata);
+ md_wakeup_thread(mddev->thread);
}
static int raid10_issue_flush(request_queue_t *q, struct gendisk *disk,
@@ -640,27 +632,107 @@ static int raid10_issue_flush(request_queue_t *q, struct gendisk *disk,
return ret;
}
-/*
- * Throttle resync depth, so that we can both get proper overlapping of
- * requests, but are still able to handle normal requests quickly.
+/* Barriers....
+ * Sometimes we need to suspend IO while we do something else,
+ * either some resync/recovery, or reconfigure the array.
+ * To do this we raise a 'barrier'.
+ * The 'barrier' is a counter that can be raised multiple times
+ * to count how many activities are happening which preclude
+ * normal IO.
+ * We can only raise the barrier if there is no pending IO.
+ * i.e. if nr_pending == 0.
+ * We choose only to raise the barrier if no-one is waiting for the
+ * barrier to go down. This means that as soon as an IO request
+ * is ready, no other operations which require a barrier will start
+ * until the IO request has had a chance.
+ *
+ * So: regular IO calls 'wait_barrier'. When that returns there
+ * is no backgroup IO happening, It must arrange to call
+ * allow_barrier when it has finished its IO.
+ * backgroup IO calls must call raise_barrier. Once that returns
+ * there is no normal IO happeing. It must arrange to call
+ * lower_barrier when the particular background IO completes.
*/
#define RESYNC_DEPTH 32
-static void device_barrier(conf_t *conf, sector_t sect)
+static void raise_barrier(conf_t *conf, int force)
+{
+ BUG_ON(force && !conf->barrier);
+ spin_lock_irq(&conf->resync_lock);
+
+ /* Wait until no block IO is waiting (unless 'force') */
+ wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting,
+ conf->resync_lock,
+ raid10_unplug(conf->mddev->queue));
+
+ /* block any new IO from starting */
+ conf->barrier++;
+
+ /* No wait for all pending IO to complete */
+ wait_event_lock_irq(conf->wait_barrier,
+ !conf->nr_pending && conf->barrier < RESYNC_DEPTH,
+ conf->resync_lock,
+ raid10_unplug(conf->mddev->queue));
+
+ spin_unlock_irq(&conf->resync_lock);
+}
+
+static void lower_barrier(conf_t *conf)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&conf->resync_lock, flags);
+ conf->barrier--;
+ spin_unlock_irqrestore(&conf->resync_lock, flags);
+ wake_up(&conf->wait_barrier);
+}
+
+static void wait_barrier(conf_t *conf)
{
spin_lock_irq(&conf->resync_lock);
- wait_event_lock_irq(conf->wait_idle, !waitqueue_active(&conf->wait_resume),
- conf->resync_lock, unplug_slaves(conf->mddev));
-
- if (!conf->barrier++) {
- wait_event_lock_irq(conf->wait_idle, !conf->nr_pending,
- conf->resync_lock, unplug_slaves(conf->mddev));
- if (conf->nr_pending)
- BUG();
+ if (conf->barrier) {
+ conf->nr_waiting++;
+ wait_event_lock_irq(conf->wait_barrier, !conf->barrier,
+ conf->resync_lock,
+ raid10_unplug(conf->mddev->queue));
+ conf->nr_waiting--;
}
- wait_event_lock_irq(conf->wait_resume, conf->barrier < RESYNC_DEPTH,
- conf->resync_lock, unplug_slaves(conf->mddev));
- conf->next_resync = sect;
+ conf->nr_pending++;
+ spin_unlock_irq(&conf->resync_lock);
+}
+
+static void allow_barrier(conf_t *conf)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&conf->resync_lock, flags);
+ conf->nr_pending--;
+ spin_unlock_irqrestore(&conf->resync_lock, flags);
+ wake_up(&conf->wait_barrier);
+}
+
+static void freeze_array(conf_t *conf)
+{
+ /* stop syncio and normal IO and wait for everything to
+ * go quiet.
+ * We increment barrier and nr_waiting, and then
+ * wait until barrier+nr_pending match nr_queued+2
+ */
+ spin_lock_irq(&conf->resync_lock);
+ conf->barrier++;
+ conf->nr_waiting++;
+ wait_event_lock_irq(conf->wait_barrier,
+ conf->barrier+conf->nr_pending == conf->nr_queued+2,
+ conf->resync_lock,
+ raid10_unplug(conf->mddev->queue));
+ spin_unlock_irq(&conf->resync_lock);
+}
+
+static void unfreeze_array(conf_t *conf)
+{
+ /* reverse the effect of the freeze */
+ spin_lock_irq(&conf->resync_lock);
+ conf->barrier--;
+ conf->nr_waiting--;
+ wake_up(&conf->wait_barrier);
spin_unlock_irq(&conf->resync_lock);
}
@@ -674,6 +746,8 @@ static int make_request(request_queue_t *q, struct bio * bio)
int i;
int chunk_sects = conf->chunk_mask + 1;
const int rw = bio_data_dir(bio);
+ struct bio_list bl;
+ unsigned long flags;
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
@@ -719,10 +793,7 @@ static int make_request(request_queue_t *q, struct bio * bio)
* thread has put up a bar for new requests.
* Continue immediately if no resync is active currently.
*/
- spin_lock_irq(&conf->resync_lock);
- wait_event_lock_irq(conf->wait_resume, !conf->barrier, conf->resync_lock, );
- conf->nr_pending++;
- spin_unlock_irq(&conf->resync_lock);
+ wait_barrier(conf);
disk_stat_inc(mddev->gendisk, ios[rw]);
disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
@@ -734,6 +805,7 @@ static int make_request(request_queue_t *q, struct bio * bio)
r10_bio->mddev = mddev;
r10_bio->sector = bio->bi_sector;
+ r10_bio->state = 0;
if (rw == READ) {
/*
@@ -778,13 +850,16 @@ static int make_request(request_queue_t *q, struct bio * bio)
!test_bit(Faulty, &rdev->flags)) {
atomic_inc(&rdev->nr_pending);
r10_bio->devs[i].bio = bio;
- } else
+ } else {
r10_bio->devs[i].bio = NULL;
+ set_bit(R10BIO_Degraded, &r10_bio->state);
+ }
}
rcu_read_unlock();
- atomic_set(&r10_bio->remaining, 1);
+ atomic_set(&r10_bio->remaining, 0);
+ bio_list_init(&bl);
for (i = 0; i < conf->copies; i++) {
struct bio *mbio;
int d = r10_bio->devs[i].devnum;
@@ -802,13 +877,14 @@ static int make_request(request_queue_t *q, struct bio * bio)
mbio->bi_private = r10_bio;
atomic_inc(&r10_bio->remaining);
- generic_make_request(mbio);
+ bio_list_add(&bl, mbio);
}
- if (atomic_dec_and_test(&r10_bio->remaining)) {
- md_write_end(mddev);
- raid_end_bio_io(r10_bio);
- }
+ bitmap_startwrite(mddev->bitmap, bio->bi_sector, r10_bio->sectors, 0);
+ spin_lock_irqsave(&conf->device_lock, flags);
+ bio_list_merge(&conf->pending_bio_list, &bl);
+ blk_plug_device(mddev->queue);
+ spin_unlock_irqrestore(&conf->device_lock, flags);
return 0;
}
@@ -897,13 +973,8 @@ static void print_conf(conf_t *conf)
static void close_sync(conf_t *conf)
{
- spin_lock_irq(&conf->resync_lock);
- wait_event_lock_irq(conf->wait_resume, !conf->barrier,
- conf->resync_lock, unplug_slaves(conf->mddev));
- spin_unlock_irq(&conf->resync_lock);
-
- if (conf->barrier) BUG();
- if (waitqueue_active(&conf->wait_idle)) BUG();
+ wait_barrier(conf);
+ allow_barrier(conf);
mempool_destroy(conf->r10buf_pool);
conf->r10buf_pool = NULL;
@@ -971,7 +1042,12 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
if (!enough(conf))
return 0;
- for (mirror=0; mirror < mddev->raid_disks; mirror++)
+ if (rdev->saved_raid_disk >= 0 &&
+ conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
+ mirror = rdev->saved_raid_disk;
+ else
+ mirror = 0;
+ for ( ; mirror < mddev->raid_disks; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
blk_queue_stack_limits(mddev->queue,
@@ -987,6 +1063,8 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
p->head_position = 0;
rdev->raid_disk = mirror;
found = 1;
+ if (rdev->saved_raid_disk != mirror)
+ conf->fullsync = 1;
rcu_assign_pointer(p->rdev, rdev);
break;
}
@@ -1027,7 +1105,6 @@ abort:
static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
{
- int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
conf_t *conf = mddev_to_conf(r10_bio->mddev);
int i,d;
@@ -1042,9 +1119,16 @@ static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
BUG();
update_head_pos(i, r10_bio);
d = r10_bio->devs[i].devnum;
- if (!uptodate)
- md_error(r10_bio->mddev,
- conf->mirrors[d].rdev);
+
+ if (test_bit(BIO_UPTODATE, &bio->bi_flags))
+ set_bit(R10BIO_Uptodate, &r10_bio->state);
+ else {
+ atomic_add(r10_bio->sectors,
+ &conf->mirrors[d].rdev->corrected_errors);
+ if (!test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery))
+ md_error(r10_bio->mddev,
+ conf->mirrors[d].rdev);
+ }
/* for reconstruct, we always reschedule after a read.
* for resync, only after all reads
@@ -1132,23 +1216,32 @@ static void sync_request_write(mddev_t *mddev, r10bio_t *r10_bio)
fbio = r10_bio->devs[i].bio;
/* now find blocks with errors */
- for (i=first+1 ; i < conf->copies ; i++) {
- int vcnt, j, d;
+ for (i=0 ; i < conf->copies ; i++) {
+ int j, d;
+ int vcnt = r10_bio->sectors >> (PAGE_SHIFT-9);
- if (!test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags))
- continue;
- /* We know that the bi_io_vec layout is the same for
- * both 'first' and 'i', so we just compare them.
- * All vec entries are PAGE_SIZE;
- */
tbio = r10_bio->devs[i].bio;
- vcnt = r10_bio->sectors >> (PAGE_SHIFT-9);
- for (j = 0; j < vcnt; j++)
- if (memcmp(page_address(fbio->bi_io_vec[j].bv_page),
- page_address(tbio->bi_io_vec[j].bv_page),
- PAGE_SIZE))
- break;
- if (j == vcnt)
+
+ if (tbio->bi_end_io != end_sync_read)
+ continue;
+ if (i == first)
+ continue;
+ if (test_bit(BIO_UPTODATE, &r10_bio->devs[i].bio->bi_flags)) {
+ /* We know that the bi_io_vec layout is the same for
+ * both 'first' and 'i', so we just compare them.
+ * All vec entries are PAGE_SIZE;
+ */
+ for (j = 0; j < vcnt; j++)
+ if (memcmp(page_address(fbio->bi_io_vec[j].bv_page),
+ page_address(tbio->bi_io_vec[j].bv_page),
+ PAGE_SIZE))
+ break;
+ if (j == vcnt)
+ continue;
+ mddev->resync_mismatches += r10_bio->sectors;
+ }
+ if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+ /* Don't fix anything. */
continue;
/* Ok, we need to write this bio
* First we need to fixup bv_offset, bv_len and
@@ -1227,7 +1320,10 @@ static void recovery_request_write(mddev_t *mddev, r10bio_t *r10_bio)
atomic_inc(&conf->mirrors[d].rdev->nr_pending);
md_sync_acct(conf->mirrors[d].rdev->bdev, wbio->bi_size >> 9);
- generic_make_request(wbio);
+ if (test_bit(R10BIO_Uptodate, &r10_bio->state))
+ generic_make_request(wbio);
+ else
+ bio_endio(wbio, wbio->bi_size, -EIO);
}
@@ -1254,10 +1350,31 @@ static void raid10d(mddev_t *mddev)
for (;;) {
char b[BDEVNAME_SIZE];
spin_lock_irqsave(&conf->device_lock, flags);
+
+ if (conf->pending_bio_list.head) {
+ bio = bio_list_get(&conf->pending_bio_list);
+ blk_remove_plug(mddev->queue);
+ spin_unlock_irqrestore(&conf->device_lock, flags);
+ /* flush any pending bitmap writes to disk before proceeding w/ I/O */
+ if (bitmap_unplug(mddev->bitmap) != 0)
+ printk("%s: bitmap file write failed!\n", mdname(mddev));
+
+ while (bio) { /* submit pending writes */
+ struct bio *next = bio->bi_next;
+ bio->bi_next = NULL;
+ generic_make_request(bio);
+ bio = next;
+ }
+ unplug = 1;
+
+ continue;
+ }
+
if (list_empty(head))
break;
r10_bio = list_entry(head->prev, r10bio_t, retry_list);
list_del(head->prev);
+ conf->nr_queued--;
spin_unlock_irqrestore(&conf->device_lock, flags);
mddev = r10_bio->mddev;
@@ -1270,8 +1387,96 @@ static void raid10d(mddev_t *mddev)
unplug = 1;
} else {
int mirror;
+ /* we got a read error. Maybe the drive is bad. Maybe just
+ * the block and we can fix it.
+ * We freeze all other IO, and try reading the block from
+ * other devices. When we find one, we re-write
+ * and check it that fixes the read error.
+ * This is all done synchronously while the array is
+ * frozen.
+ */
+ int sect = 0; /* Offset from r10_bio->sector */
+ int sectors = r10_bio->sectors;
+ freeze_array(conf);
+ if (mddev->ro == 0) while(sectors) {
+ int s = sectors;
+ int sl = r10_bio->read_slot;
+ int success = 0;
+
+ if (s > (PAGE_SIZE>>9))
+ s = PAGE_SIZE >> 9;
+
+ do {
+ int d = r10_bio->devs[sl].devnum;
+ rdev = conf->mirrors[d].rdev;
+ if (rdev &&
+ test_bit(In_sync, &rdev->flags) &&
+ sync_page_io(rdev->bdev,
+ r10_bio->devs[sl].addr +
+ sect + rdev->data_offset,
+ s<<9,
+ conf->tmppage, READ))
+ success = 1;
+ else {
+ sl++;
+ if (sl == conf->copies)
+ sl = 0;
+ }
+ } while (!success && sl != r10_bio->read_slot);
+
+ if (success) {
+ int start = sl;
+ /* write it back and re-read */
+ while (sl != r10_bio->read_slot) {
+ int d;
+ if (sl==0)
+ sl = conf->copies;
+ sl--;
+ d = r10_bio->devs[sl].devnum;
+ rdev = conf->mirrors[d].rdev;
+ atomic_add(s, &rdev->corrected_errors);
+ if (rdev &&
+ test_bit(In_sync, &rdev->flags)) {
+ if (sync_page_io(rdev->bdev,
+ r10_bio->devs[sl].addr +
+ sect + rdev->data_offset,
+ s<<9, conf->tmppage, WRITE) == 0)
+ /* Well, this device is dead */
+ md_error(mddev, rdev);
+ }
+ }
+ sl = start;
+ while (sl != r10_bio->read_slot) {
+ int d;
+ if (sl==0)
+ sl = conf->copies;
+ sl--;
+ d = r10_bio->devs[sl].devnum;
+ rdev = conf->mirrors[d].rdev;
+ if (rdev &&
+ test_bit(In_sync, &rdev->flags)) {
+ if (sync_page_io(rdev->bdev,
+ r10_bio->devs[sl].addr +
+ sect + rdev->data_offset,
+ s<<9, conf->tmppage, READ) == 0)
+ /* Well, this device is dead */
+ md_error(mddev, rdev);
+ }
+ }
+ } else {
+ /* Cannot read from anywhere -- bye bye array */
+ md_error(mddev, conf->mirrors[r10_bio->devs[r10_bio->read_slot].devnum].rdev);
+ break;
+ }
+ sectors -= s;
+ sect += s;
+ }
+
+ unfreeze_array(conf);
+
bio = r10_bio->devs[r10_bio->read_slot].bio;
- r10_bio->devs[r10_bio->read_slot].bio = NULL;
+ r10_bio->devs[r10_bio->read_slot].bio =
+ mddev->ro ? IO_BLOCKED : NULL;
bio_put(bio);
mirror = read_balance(conf, r10_bio);
if (mirror == -1) {
@@ -1360,6 +1565,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
sector_t max_sector, nr_sectors;
int disk;
int i;
+ int max_sync;
+ int sync_blocks;
sector_t sectors_skipped = 0;
int chunks_skipped = 0;
@@ -1373,6 +1580,29 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
max_sector = mddev->resync_max_sectors;
if (sector_nr >= max_sector) {
+ /* If we aborted, we need to abort the
+ * sync on the 'current' bitmap chucks (there can
+ * be several when recovering multiple devices).
+ * as we may have started syncing it but not finished.
+ * We can find the current address in
+ * mddev->curr_resync, but for recovery,
+ * we need to convert that to several
+ * virtual addresses.
+ */
+ if (mddev->curr_resync < max_sector) { /* aborted */
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
+ &sync_blocks, 1);
+ else for (i=0; i<conf->raid_disks; i++) {
+ sector_t sect =
+ raid10_find_virt(conf, mddev->curr_resync, i);
+ bitmap_end_sync(mddev->bitmap, sect,
+ &sync_blocks, 1);
+ }
+ } else /* completed sync */
+ conf->fullsync = 0;
+
+ bitmap_close_sync(mddev->bitmap);
close_sync(conf);
*skipped = 1;
return sectors_skipped;
@@ -1395,9 +1625,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
* If there is non-resync activity waiting for us then
* put in a delay to throttle resync.
*/
- if (!go_faster && waitqueue_active(&conf->wait_resume))
+ if (!go_faster && conf->nr_waiting)
msleep_interruptible(1000);
- device_barrier(conf, sector_nr + RESYNC_SECTORS);
/* Again, very different code for resync and recovery.
* Both must result in an r10bio with a list of bios that
@@ -1414,6 +1643,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
* end_sync_write if we will want to write.
*/
+ max_sync = RESYNC_PAGES << (PAGE_SHIFT-9);
if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
/* recovery... the complicated one */
int i, j, k;
@@ -1422,14 +1652,29 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
for (i=0 ; i<conf->raid_disks; i++)
if (conf->mirrors[i].rdev &&
!test_bit(In_sync, &conf->mirrors[i].rdev->flags)) {
+ int still_degraded = 0;
/* want to reconstruct this device */
r10bio_t *rb2 = r10_bio;
+ sector_t sect = raid10_find_virt(conf, sector_nr, i);
+ int must_sync;
+ /* Unless we are doing a full sync, we only need
+ * to recover the block if it is set in the bitmap
+ */
+ must_sync = bitmap_start_sync(mddev->bitmap, sect,
+ &sync_blocks, 1);
+ if (sync_blocks < max_sync)
+ max_sync = sync_blocks;
+ if (!must_sync &&
+ !conf->fullsync) {
+ /* yep, skip the sync_blocks here, but don't assume
+ * that there will never be anything to do here
+ */
+ chunks_skipped = -1;
+ continue;
+ }
r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
- spin_lock_irq(&conf->resync_lock);
- conf->nr_pending++;
- if (rb2) conf->barrier++;
- spin_unlock_irq(&conf->resync_lock);
+ raise_barrier(conf, rb2 != NULL);
atomic_set(&r10_bio->remaining, 0);
r10_bio->master_bio = (struct bio*)rb2;
@@ -1437,8 +1682,23 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
atomic_inc(&rb2->remaining);
r10_bio->mddev = mddev;
set_bit(R10BIO_IsRecover, &r10_bio->state);
- r10_bio->sector = raid10_find_virt(conf, sector_nr, i);
+ r10_bio->sector = sect;
+
raid10_find_phys(conf, r10_bio);
+ /* Need to check if this section will still be
+ * degraded
+ */
+ for (j=0; j<conf->copies;j++) {
+ int d = r10_bio->devs[j].devnum;
+ if (conf->mirrors[d].rdev == NULL ||
+ test_bit(Faulty, &conf->mirrors[d].rdev->flags)) {
+ still_degraded = 1;
+ break;
+ }
+ }
+ must_sync = bitmap_start_sync(mddev->bitmap, sect,
+ &sync_blocks, still_degraded);
+
for (j=0; j<conf->copies;j++) {
int d = r10_bio->devs[j].devnum;
if (conf->mirrors[d].rdev &&
@@ -1498,14 +1758,22 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
} else {
/* resync. Schedule a read for every block at this virt offset */
int count = 0;
- r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
- spin_lock_irq(&conf->resync_lock);
- conf->nr_pending++;
- spin_unlock_irq(&conf->resync_lock);
+ if (!bitmap_start_sync(mddev->bitmap, sector_nr,
+ &sync_blocks, mddev->degraded) &&
+ !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
+ /* We can skip this block */
+ *skipped = 1;
+ return sync_blocks + sectors_skipped;
+ }
+ if (sync_blocks < max_sync)
+ max_sync = sync_blocks;
+ r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
r10_bio->mddev = mddev;
atomic_set(&r10_bio->remaining, 0);
+ raise_barrier(conf, 0);
+ conf->next_resync = sector_nr;
r10_bio->master_bio = NULL;
r10_bio->sector = sector_nr;
@@ -1558,6 +1826,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
}
nr_sectors = 0;
+ if (sector_nr + max_sync < max_sector)
+ max_sector = sector_nr + max_sync;
do {
struct page *page;
int len = PAGE_SIZE;
@@ -1632,11 +1902,11 @@ static int run(mddev_t *mddev)
int nc, fc;
sector_t stride, size;
- if (mddev->level != 10) {
- printk(KERN_ERR "raid10: %s: raid level not set correctly... (%d)\n",
- mdname(mddev), mddev->level);
- goto out;
+ if (mddev->chunk_size == 0) {
+ printk(KERN_ERR "md/raid10: non-zero chunk size required.\n");
+ return -EINVAL;
}
+
nc = mddev->layout & 255;
fc = (mddev->layout >> 8) & 255;
if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks ||
@@ -1650,22 +1920,24 @@ static int run(mddev_t *mddev)
* bookkeeping area. [whatever we allocate in run(),
* should be freed in stop()]
*/
- conf = kmalloc(sizeof(conf_t), GFP_KERNEL);
+ conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
mddev->private = conf;
if (!conf) {
printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
mdname(mddev));
goto out;
}
- memset(conf, 0, sizeof(*conf));
- conf->mirrors = kmalloc(sizeof(struct mirror_info)*mddev->raid_disks,
+ conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
GFP_KERNEL);
if (!conf->mirrors) {
printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
mdname(mddev));
goto out_free_conf;
}
- memset(conf->mirrors, 0, sizeof(struct mirror_info)*mddev->raid_disks);
+
+ conf->tmppage = alloc_page(GFP_KERNEL);
+ if (!conf->tmppage)
+ goto out_free_conf;
conf->near_copies = nc;
conf->far_copies = fc;
@@ -1713,8 +1985,7 @@ static int run(mddev_t *mddev)
INIT_LIST_HEAD(&conf->retry_list);
spin_lock_init(&conf->resync_lock);
- init_waitqueue_head(&conf->wait_idle);
- init_waitqueue_head(&conf->wait_resume);
+ init_waitqueue_head(&conf->wait_barrier);
/* need to check that every block has at least one working mirror */
if (!enough(conf)) {
@@ -1763,7 +2034,7 @@ static int run(mddev_t *mddev)
* maybe...
*/
{
- int stripe = conf->raid_disks * mddev->chunk_size / PAGE_CACHE_SIZE;
+ int stripe = conf->raid_disks * mddev->chunk_size / PAGE_SIZE;
stripe /= conf->near_copies;
if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
mddev->queue->backing_dev_info.ra_pages = 2* stripe;
@@ -1776,6 +2047,7 @@ static int run(mddev_t *mddev)
out_free_conf:
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
+ safe_put_page(conf->tmppage);
kfree(conf->mirrors);
kfree(conf);
mddev->private = NULL;
@@ -1798,10 +2070,31 @@ static int stop(mddev_t *mddev)
return 0;
}
+static void raid10_quiesce(mddev_t *mddev, int state)
+{
+ conf_t *conf = mddev_to_conf(mddev);
+
+ switch(state) {
+ case 1:
+ raise_barrier(conf, 0);
+ break;
+ case 0:
+ lower_barrier(conf);
+ break;
+ }
+ if (mddev->thread) {
+ if (mddev->bitmap)
+ mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ;
+ else
+ mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
+ md_wakeup_thread(mddev->thread);
+ }
+}
-static mdk_personality_t raid10_personality =
+static struct mdk_personality raid10_personality =
{
.name = "raid10",
+ .level = 10,
.owner = THIS_MODULE,
.make_request = make_request,
.run = run,
@@ -1812,19 +2105,22 @@ static mdk_personality_t raid10_personality =
.hot_remove_disk= raid10_remove_disk,
.spare_active = raid10_spare_active,
.sync_request = sync_request,
+ .quiesce = raid10_quiesce,
};
static int __init raid_init(void)
{
- return register_md_personality(RAID10, &raid10_personality);
+ return register_md_personality(&raid10_personality);
}
static void raid_exit(void)
{
- unregister_md_personality(RAID10);
+ unregister_md_personality(&raid10_personality);
}
module_init(raid_init);
module_exit(raid_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("md-personality-9"); /* RAID10 */
+MODULE_ALIAS("md-raid10");
+MODULE_ALIAS("md-level-10");
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