* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include "dm-bio-list.h"
-#include <linux/raid/raid1.h>
-#include <linux/raid/bitmap.h>
+#include <linux/delay.h>
+#include <linux/blkdev.h>
+#include <linux/seq_file.h>
+#include "md.h"
+#include "raid1.h"
+#include "bitmap.h"
#define DEBUG 0
#if DEBUG
goto out_free_pages;
bio->bi_io_vec[i].bv_page = page;
+ bio->bi_vcnt = i+1;
}
}
/* If not user-requests, copy the page pointers to all bios */
return r1_bio;
out_free_pages:
- for (i=0; i < RESYNC_PAGES ; i++)
- for (j=0 ; j < pi->raid_disks; j++)
- safe_put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
+ for (j=0 ; j < pi->raid_disks; j++)
+ for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++)
+ put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
j = -1;
out_free_bio:
while ( ++j < pi->raid_disks )
/* Note the '|| 1' - when read_balance prefers
* non-congested targets, it can be removed
*/
- if ((bits & (1<<BDI_write_congested)) || 1)
+ if ((bits & (1<<BDI_async_congested)) || 1)
ret |= bdi_congested(&q->backing_dev_info, bits);
else
ret &= bdi_congested(&q->backing_dev_info, bits);
r1bio_t *r1_bio;
struct bio *read_bio;
int i, targets = 0, disks;
- mdk_rdev_t *rdev;
- struct bitmap *bitmap = mddev->bitmap;
+ struct bitmap *bitmap;
unsigned long flags;
struct bio_list bl;
struct page **behind_pages = NULL;
const int rw = bio_data_dir(bio);
const int do_sync = bio_sync(bio);
- int do_barriers;
+ int cpu, do_barriers;
+ mdk_rdev_t *blocked_rdev;
/*
* Register the new request and wait if the reconstruction
wait_barrier(conf);
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ bitmap = mddev->bitmap;
+
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bio));
+ part_stat_unlock();
/*
* make_request() can abort the operation when READA is being
first = 0;
}
#endif
+ retry_write:
+ blocked_rdev = NULL;
rcu_read_lock();
for (i = 0; i < disks; i++) {
- if ((rdev=rcu_dereference(conf->mirrors[i].rdev)) != NULL &&
- !test_bit(Faulty, &rdev->flags)) {
+ mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
+ if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
+ atomic_inc(&rdev->nr_pending);
+ blocked_rdev = rdev;
+ break;
+ }
+ if (rdev && !test_bit(Faulty, &rdev->flags)) {
atomic_inc(&rdev->nr_pending);
if (test_bit(Faulty, &rdev->flags)) {
rdev_dec_pending(rdev, mddev);
}
rcu_read_unlock();
+ if (unlikely(blocked_rdev)) {
+ /* Wait for this device to become unblocked */
+ int j;
+
+ for (j = 0; j < i; j++)
+ if (r1_bio->bios[j])
+ rdev_dec_pending(conf->mirrors[j].rdev, mddev);
+
+ allow_barrier(conf);
+ md_wait_for_blocked_rdev(blocked_rdev, mddev);
+ wait_barrier(conf);
+ goto retry_write;
+ }
+
BUG_ON(targets == 0); /* we never fail the last device */
if (targets < conf->raid_disks) {
* else mark the drive as failed
*/
if (test_bit(In_sync, &rdev->flags)
- && (conf->raid_disks - mddev->degraded) == 1)
+ && (conf->raid_disks - mddev->degraded) == 1) {
/*
* Don't fail the drive, act as though we were just a
- * normal single drive
+ * normal single drive.
+ * However don't try a recovery from this drive as
+ * it is very likely to fail.
*/
+ mddev->recovery_disabled = 1;
return;
+ }
if (test_and_clear_bit(In_sync, &rdev->flags)) {
unsigned long flags;
spin_lock_irqsave(&conf->device_lock, flags);
/*
* if recovery is running, make sure it aborts.
*/
- set_bit(MD_RECOVERY_ERR, &mddev->recovery);
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
} else
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
- printk(KERN_ALERT "raid1: Disk failure on %s, disabling device. \n"
- " Operation continuing on %d devices\n",
+ printk(KERN_ALERT "raid1: Disk failure on %s, disabling device.\n"
+ "raid1: Operation continuing on %d devices.\n",
bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
}
static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
{
conf_t *conf = mddev->private;
- int found = 0;
+ int err = -EEXIST;
int mirror = 0;
mirror_info_t *p;
+ int first = 0;
+ int last = mddev->raid_disks - 1;
+
+ if (rdev->raid_disk >= 0)
+ first = last = rdev->raid_disk;
- for (mirror=0; mirror < mddev->raid_disks; mirror++)
+ for (mirror = first; mirror <= last; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
blk_queue_stack_limits(mddev->queue,
p->head_position = 0;
rdev->raid_disk = mirror;
- found = 1;
+ err = 0;
/* As all devices are equivalent, we don't need a full recovery
* if this was recently any drive of the array
*/
}
print_conf(conf);
- return found;
+ return err;
}
static int raid1_remove_disk(mddev_t *mddev, int number)
err = -EBUSY;
goto abort;
}
+ /* Only remove non-faulty devices is recovery
+ * is not possible.
+ */
+ if (!test_bit(Faulty, &rdev->flags) &&
+ mddev->degraded < conf->raid_disks) {
+ err = -EBUSY;
+ goto abort;
+ }
p->rdev = NULL;
synchronize_rcu();
if (atomic_read(&rdev->nr_pending)) {
update_head_pos(mirror, r1_bio);
if (atomic_dec_and_test(&r1_bio->remaining)) {
- md_done_sync(mddev, r1_bio->sectors, uptodate);
+ sector_t s = r1_bio->sectors;
put_buf(r1_bio);
+ md_done_sync(mddev, s, uptodate);
}
}
rdev_dec_pending(conf->mirrors[i].rdev, mddev);
} else {
/* fixup the bio for reuse */
+ int size;
sbio->bi_vcnt = vcnt;
sbio->bi_size = r1_bio->sectors << 9;
sbio->bi_idx = 0;
sbio->bi_phys_segments = 0;
- sbio->bi_hw_segments = 0;
- sbio->bi_hw_front_size = 0;
- sbio->bi_hw_back_size = 0;
sbio->bi_flags &= ~(BIO_POOL_MASK - 1);
sbio->bi_flags |= 1 << BIO_UPTODATE;
sbio->bi_next = NULL;
sbio->bi_sector = r1_bio->sector +
conf->mirrors[i].rdev->data_offset;
sbio->bi_bdev = conf->mirrors[i].rdev->bdev;
- for (j = 0; j < vcnt ; j++)
- memcpy(page_address(sbio->bi_io_vec[j].bv_page),
+ size = sbio->bi_size;
+ for (j = 0; j < vcnt ; j++) {
+ struct bio_vec *bi;
+ bi = &sbio->bi_io_vec[j];
+ bi->bv_offset = 0;
+ if (size > PAGE_SIZE)
+ bi->bv_len = PAGE_SIZE;
+ else
+ bi->bv_len = size;
+ size -= PAGE_SIZE;
+ memcpy(page_address(bi->bv_page),
page_address(pbio->bi_io_vec[j].bv_page),
PAGE_SIZE);
+ }
}
}
}
bio = r1_bio->bios[r1_bio->read_disk];
- if ((disk=read_balance(conf, r1_bio)) == -1) {
+ if ((disk=read_balance(conf, r1_bio)) == -1 ||
+ disk == r1_bio->read_disk) {
printk(KERN_ALERT "raid1: %s: unrecoverable I/O"
" read error for block %llu\n",
bdevname(bio->bi_bdev,b),
return 0;
}
- max_sector = mddev->size << 1;
+ max_sector = mddev->dev_sectors;
if (sector_nr >= max_sector) {
/* If we aborted, we need to abort the
* sync on the 'current' bitmap chunk (there will
bio->bi_vcnt = 0;
bio->bi_idx = 0;
bio->bi_phys_segments = 0;
- bio->bi_hw_segments = 0;
bio->bi_size = 0;
bio->bi_end_io = NULL;
bio->bi_private = NULL;
return nr_sectors;
}
+static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks)
+{
+ if (sectors)
+ return sectors;
+
+ return mddev->dev_sectors;
+}
+
static int run(mddev_t *mddev)
{
conf_t *conf;
int i, j, disk_idx;
mirror_info_t *disk;
mdk_rdev_t *rdev;
- struct list_head *tmp;
if (mddev->level != 1) {
printk("raid1: %s: raid level not set to mirroring (%d)\n",
if (!conf->r1bio_pool)
goto out_no_mem;
- rdev_for_each(rdev, tmp, mddev) {
+ spin_lock_init(&conf->device_lock);
+ mddev->queue->queue_lock = &conf->device_lock;
+
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
|| disk_idx < 0)
}
conf->raid_disks = mddev->raid_disks;
conf->mddev = mddev;
- spin_lock_init(&conf->device_lock);
INIT_LIST_HEAD(&conf->retry_list);
spin_lock_init(&conf->resync_lock);
/*
* Ok, everything is just fine now
*/
- mddev->array_size = mddev->size;
+ md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
mddev->queue->unplug_fn = raid1_unplug;
mddev->queue->backing_dev_info.congested_fn = raid1_congested;
/* need to kick something here to make sure I/O goes? */
}
+ raise_barrier(conf);
+ lower_barrier(conf);
+
md_unregister_thread(mddev->thread);
mddev->thread = NULL;
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
* any io in the removed space completes, but it hardly seems
* worth it.
*/
- mddev->array_size = sectors>>1;
- set_capacity(mddev->gendisk, mddev->array_size << 1);
+ md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0));
+ if (mddev->array_sectors > raid1_size(mddev, sectors, 0))
+ return -EINVAL;
+ set_capacity(mddev->gendisk, mddev->array_sectors);
mddev->changed = 1;
- if (mddev->array_size > mddev->size && mddev->recovery_cp == MaxSector) {
- mddev->recovery_cp = mddev->size << 1;
+ if (sectors > mddev->dev_sectors &&
+ mddev->recovery_cp == MaxSector) {
+ mddev->recovery_cp = mddev->dev_sectors;
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
}
- mddev->size = mddev->array_size;
+ mddev->dev_sectors = sectors;
mddev->resync_max_sectors = sectors;
return 0;
}
conf_t *conf = mddev_to_conf(mddev);
int cnt, raid_disks;
unsigned long flags;
- int d, d2;
+ int d, d2, err;
/* Cannot change chunk_size, layout, or level */
if (mddev->chunk_size != mddev->new_chunk ||
return -EINVAL;
}
- md_allow_write(mddev);
+ err = md_allow_write(mddev);
+ if (err)
+ return err;
raid_disks = mddev->raid_disks + mddev->delta_disks;
.spare_active = raid1_spare_active,
.sync_request = sync_request,
.resize = raid1_resize,
+ .size = raid1_size,
.check_reshape = raid1_reshape,
.quiesce = raid1_quiesce,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff