md_unregister_thread(mddev->sync_thread);
mddev->sync_thread = NULL;
if (mddev->spare) {
- mddev->pers->diskop(mddev, &mddev->spare,
- DISKOP_SPARE_INACTIVE);
+ mddev->pers->spare_inactive(mddev);
mddev->spare = NULL;
}
}
printk(KERN_INFO "md: trying to remove %s from md%d ... \n",
partition_name(dev), mdidx(mddev));
- if (!mddev->pers->diskop) {
+ if (!mddev->pers->hot_remove_disk) {
printk(KERN_WARNING "md%d: personality does not support diskops!\n",
mdidx(mddev));
return -EINVAL;
return -EINVAL;
}
- err = mddev->pers->diskop(mddev, &disk, DISKOP_HOT_REMOVE_DISK);
+ err = mddev->pers->hot_remove_disk(mddev, disk->number);
if (err == -EBUSY) {
MD_BUG();
goto busy;
printk(KERN_INFO "md: trying to hot-add %s to md%d ... \n",
partition_name(dev), mdidx(mddev));
- if (!mddev->pers->diskop) {
+ if (!mddev->pers->hot_add_disk) {
printk(KERN_WARNING "md%d: personality does not support diskops!\n",
mdidx(mddev));
return -EINVAL;
disk->major = major(dev);
disk->minor = minor(dev);
- if (mddev->pers->diskop(mddev, &disk, DISKOP_HOT_ADD_DISK)) {
+ if (mddev->pers->hot_add_disk(mddev, disk, rdev)) {
MD_BUG();
err = -EINVAL;
goto abort_unbind_export;
ITERATE_MDDEV(mddev,tmp) if (mddev_lock(mddev)==0) {
sb = mddev->sb;
- if (!sb || !mddev->pers || !mddev->pers->diskop || mddev->ro)
+ if (!sb || !mddev->pers || mddev->ro)
goto unlock;
if (mddev->recovery_running > 0)
/* resync/recovery still happening */
* If we were doing a reconstruction,
* we need to retrieve the spare
*/
+ if (!mddev->pers->spare_inactive)
+ goto unlock;
if (mddev->spare) {
- mddev->pers->diskop(mddev, &mddev->spare,
- DISKOP_SPARE_INACTIVE);
+ mddev->pers->spare_inactive(mddev);
mddev->spare = NULL;
}
} else {
+ if (!mddev->pers->spare_active)
+ goto unlock;
/* success...*/
if (mddev->spare) {
- mddev->pers->diskop(mddev, &mddev->spare,
- DISKOP_SPARE_ACTIVE);
+ mddev->pers->spare_active(mddev,
+ &mddev->spare);
mark_disk_sync(mddev->spare);
mark_disk_active(mddev->spare);
sb->active_disks++;
if (!mddev->sync_thread) {
printk(KERN_ERR "md%d: could not start resync thread...\n", mdidx(mddev));
if (mddev->spare)
- mddev->pers->diskop(mddev, &mddev->spare, DISKOP_SPARE_INACTIVE);
+ mddev->pers->spare_inactive(mddev);
mddev->spare = NULL;
mddev->recovery_running = 0;
} else {
if (mddev->spare)
- mddev->pers->diskop(mddev, &mddev->spare, DISKOP_SPARE_WRITE);
+ mddev->pers->spare_write(mddev,
+ mddev->spare->number);
mddev->recovery_running = 1;
md_wakeup_thread(mddev->sync_thread);
}
static spinlock_t retry_list_lock = SPIN_LOCK_UNLOCKED;
struct multipath_bh *multipath_retry_list = NULL, **multipath_retry_tail;
-static int multipath_diskop(mddev_t *mddev, mdp_disk_t **d, int state);
-
-
+static int multipath_spare_write(mddev_t *, int);
+static int multipath_spare_active(mddev_t *mddev, mdp_disk_t **d);
static struct multipath_bh *multipath_alloc_mpbh(multipath_conf_t *conf)
{
spare = get_spare(mddev);
if (spare) {
- err = multipath_diskop(mddev, &spare, DISKOP_SPARE_WRITE);
+ err = multipath_spare_write(mddev, spare->number);
printk("got DISKOP_SPARE_WRITE err: %d. (spare_faulty(): %d)\n", err, disk_faulty(spare));
}
if (!err && !disk_faulty(spare)) {
- multipath_diskop(mddev, &spare, DISKOP_SPARE_ACTIVE);
+ multipath_spare_active(mddev, &spare);
mark_disk_sync(spare);
mark_disk_active(spare);
sb->active_disks++;
}
}
-static int multipath_diskop(mddev_t *mddev, mdp_disk_t **d, int state)
+/*
+ * Find the spare disk ... (can only be in the 'high' area of the array)
+ */
+static struct multipath_info *find_spare(mddev_t *mddev, int number)
{
- int err = 0;
- int i, failed_disk=-1, spare_disk=-1, removed_disk=-1, added_disk=-1;
multipath_conf_t *conf = mddev->private;
- struct multipath_info *tmp, *sdisk, *fdisk, *rdisk, *adisk;
- mdp_super_t *sb = mddev->sb;
- mdp_disk_t *failed_desc, *spare_desc, *added_desc;
- mdk_rdev_t *spare_rdev, *failed_rdev;
- struct block_device *bdev;
+ int i;
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ struct multipath_info *p = conf->multipaths + i;
+ if (p->spare && p->number == number)
+ return p;
+ }
+ return NULL;
+}
+
+static int multipath_spare_inactive(mddev_t *mddev)
+{
+ multipath_conf_t *conf = mddev->private;
+ struct multipath_info *p;
+ int err = 0;
print_multipath_conf(conf);
spin_lock_irq(&conf->device_lock);
- /*
- * find the disk ...
- */
- switch (state) {
-
- case DISKOP_SPARE_ACTIVE:
+ p = find_spare(mddev, mddev->spare->number);
+ if (p) {
+ p->operational = 0;
+ } else {
+ MD_BUG();
+ err = 1;
+ }
+ spin_unlock_irq(&conf->device_lock);
- /*
- * Find the failed disk within the MULTIPATH configuration ...
- * (this can only be in the first conf->working_disks part)
- */
- for (i = 0; i < conf->raid_disks; i++) {
- tmp = conf->multipaths + i;
- if ((!tmp->operational && !tmp->spare) ||
- !tmp->used_slot) {
- failed_disk = i;
- break;
- }
- }
- /*
- * When we activate a spare disk we _must_ have a disk in
- * the lower (active) part of the array to replace.
- */
- if ((failed_disk == -1) || (failed_disk >= conf->raid_disks)) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- /* fall through */
+ print_multipath_conf(conf);
+ return err;
+}
- case DISKOP_SPARE_WRITE:
- case DISKOP_SPARE_INACTIVE:
+static int multipath_spare_write(mddev_t *mddev, int number)
+{
+ multipath_conf_t *conf = mddev->private;
+ struct multipath_info *p;
+ int err = 0;
- /*
- * Find the spare disk ... (can only be in the 'high'
- * area of the array)
- */
- for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
- tmp = conf->multipaths + i;
- if (tmp->spare && tmp->number == (*d)->number) {
- spare_disk = i;
- break;
- }
- }
- if (spare_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
-
- case DISKOP_HOT_REMOVE_DISK:
-
- for (i = 0; i < MD_SB_DISKS; i++) {
- tmp = conf->multipaths + i;
- if (tmp->used_slot && (tmp->number == (*d)->number)) {
- if (tmp->operational) {
- printk(KERN_ERR "hot-remove-disk, slot %d is identified to be the requested disk (number %d), but is still operational!\n", i, (*d)->number);
- err = -EBUSY;
- goto abort;
- }
- removed_disk = i;
- break;
- }
- }
- if (removed_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
+ print_multipath_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ p = find_spare(mddev, number);
+ if (p) {
+ p->operational = 1;
+ } else {
+ MD_BUG();
+ err = 1;
+ }
+ spin_unlock_irq(&conf->device_lock);
- case DISKOP_HOT_ADD_DISK:
+ print_multipath_conf(conf);
+ return err;
+}
- for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
- tmp = conf->multipaths + i;
- if (!tmp->used_slot) {
- added_disk = i;
- break;
- }
- }
- if (added_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
- }
+static int multipath_spare_active(mddev_t *mddev, mdp_disk_t **d)
+{
+ int err = 0;
+ int i, failed_disk=-1, spare_disk=-1;
+ multipath_conf_t *conf = mddev->private;
+ struct multipath_info *tmp, *sdisk, *fdisk;
+ mdp_super_t *sb = mddev->sb;
+ mdp_disk_t *failed_desc, *spare_desc;
+ mdk_rdev_t *spare_rdev, *failed_rdev;
- switch (state) {
+ print_multipath_conf(conf);
+ spin_lock_irq(&conf->device_lock);
/*
- * Switch the spare disk to write-only mode:
+ * Find the failed disk within the MULTIPATH configuration ...
+ * (this can only be in the first conf->working_disks part)
*/
- case DISKOP_SPARE_WRITE:
- sdisk = conf->multipaths + spare_disk;
- sdisk->operational = 1;
- break;
+ for (i = 0; i < conf->raid_disks; i++) {
+ tmp = conf->multipaths + i;
+ if ((!tmp->operational && !tmp->spare) ||
+ !tmp->used_slot) {
+ failed_disk = i;
+ break;
+ }
+ }
/*
- * Deactivate a spare disk:
+ * When we activate a spare disk we _must_ have a disk in
+ * the lower (active) part of the array to replace.
*/
- case DISKOP_SPARE_INACTIVE:
- sdisk = conf->multipaths + spare_disk;
- sdisk->operational = 0;
- break;
+ if (failed_disk == -1) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
/*
- * Activate (mark read-write) the (now sync) spare disk,
- * which means we switch it's 'raid position' (->raid_disk)
- * with the failed disk. (only the first 'conf->nr_disks'
- * slots are used for 'real' disks and we must preserve this
- * property)
+ * Find the spare disk ... (can only be in the 'high'
+ * area of the array)
*/
- case DISKOP_SPARE_ACTIVE:
- sdisk = conf->multipaths + spare_disk;
- fdisk = conf->multipaths + failed_disk;
-
- spare_desc = &sb->disks[sdisk->number];
- failed_desc = &sb->disks[fdisk->number];
-
- if (spare_desc != *d) {
- MD_BUG();
- err = 1;
- goto abort;
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ tmp = conf->multipaths + i;
+ if (tmp->spare && tmp->number == (*d)->number) {
+ spare_disk = i;
+ break;
}
+ }
+ if (spare_disk == -1) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
- if (spare_desc->raid_disk != sdisk->raid_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
-
- if (sdisk->raid_disk != spare_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ sdisk = conf->multipaths + spare_disk;
+ fdisk = conf->multipaths + failed_disk;
- if (failed_desc->raid_disk != fdisk->raid_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ spare_desc = &sb->disks[sdisk->number];
+ failed_desc = &sb->disks[fdisk->number];
- if (fdisk->raid_disk != failed_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ if (spare_desc != *d || spare_desc->raid_disk != sdisk->raid_disk ||
+ sdisk->raid_disk != spare_disk || fdisk->raid_disk != failed_disk ||
+ failed_desc->raid_disk != fdisk->raid_disk) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
- /*
- * do the switch finally
- */
- spare_rdev = find_rdev_nr(mddev, spare_desc->number);
- failed_rdev = find_rdev_nr(mddev, failed_desc->number);
- xchg_values(spare_rdev->desc_nr, failed_rdev->desc_nr);
- spare_rdev->alias_device = 0;
- failed_rdev->alias_device = 1;
+ /*
+ * do the switch finally
+ */
+ spare_rdev = find_rdev_nr(mddev, spare_desc->number);
+ failed_rdev = find_rdev_nr(mddev, failed_desc->number);
+ xchg_values(spare_rdev->desc_nr, failed_rdev->desc_nr);
+ spare_rdev->alias_device = 0;
+ failed_rdev->alias_device = 1;
- xchg_values(*spare_desc, *failed_desc);
- xchg_values(*fdisk, *sdisk);
+ xchg_values(*spare_desc, *failed_desc);
+ xchg_values(*fdisk, *sdisk);
- /*
- * (careful, 'failed' and 'spare' are switched from now on)
- *
- * we want to preserve linear numbering and we want to
- * give the proper raid_disk number to the now activated
- * disk. (this means we switch back these values)
- */
-
- xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
- xchg_values(sdisk->raid_disk, fdisk->raid_disk);
- xchg_values(spare_desc->number, failed_desc->number);
- xchg_values(sdisk->number, fdisk->number);
+ /*
+ * (careful, 'failed' and 'spare' are switched from now on)
+ *
+ * we want to preserve linear numbering and we want to
+ * give the proper raid_disk number to the now activated
+ * disk. (this means we switch back these values)
+ */
- *d = failed_desc;
+ xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
+ xchg_values(sdisk->raid_disk, fdisk->raid_disk);
+ xchg_values(spare_desc->number, failed_desc->number);
+ xchg_values(sdisk->number, fdisk->number);
- if (!sdisk->bdev)
- sdisk->used_slot = 0;
- /*
- * this really activates the spare.
- */
- fdisk->spare = 0;
+ *d = failed_desc;
- /*
- * if we activate a spare, we definitely replace a
- * non-operational disk slot in the 'low' area of
- * the disk array.
- */
+ if (!sdisk->bdev)
+ sdisk->used_slot = 0;
+ /*
+ * this really activates the spare.
+ */
+ fdisk->spare = 0;
- conf->working_disks++;
+ /*
+ * if we activate a spare, we definitely replace a
+ * non-operational disk slot in the 'low' area of
+ * the disk array.
+ */
- break;
+ conf->working_disks++;
+abort:
+ spin_unlock_irq(&conf->device_lock);
- case DISKOP_HOT_REMOVE_DISK:
- rdisk = conf->multipaths + removed_disk;
+ print_multipath_conf(conf);
+ return err;
+}
- if (rdisk->spare && (removed_disk < conf->raid_disks)) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- bdev = rdisk->bdev;
- rdisk->dev = NODEV;
- rdisk->bdev = NULL;
- rdisk->used_slot = 0;
- conf->nr_disks--;
- bdput(bdev);
- break;
-
- case DISKOP_HOT_ADD_DISK:
- adisk = conf->multipaths + added_disk;
- added_desc = *d;
-
- if (added_disk != added_desc->number) {
- MD_BUG();
- err = 1;
- goto abort;
+static int multipath_add_disk(mddev_t *mddev, mdp_disk_t *added_desc,
+ mdk_rdev_t *rdev)
+{
+ multipath_conf_t *conf = mddev->private;
+ int err = 1;
+ int i;
+
+ print_multipath_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ struct multipath_info *p = conf->multipaths + i;
+ if (!p->used_slot) {
+ if (added_desc->number != i)
+ break;
+ p->number = added_desc->number;
+ p->raid_disk = added_desc->raid_disk;
+ p->dev = rdev->dev;
+ p->bdev = rdev->bdev;
+ p->operational = 0;
+ p->spare = 1;
+ p->used_slot = 1;
+ conf->nr_disks++;
+ err = 0;
+ break;
}
+ }
+ if (err)
+ MD_BUG();
+ spin_unlock_irq(&conf->device_lock);
- adisk->number = added_desc->number;
- adisk->raid_disk = added_desc->raid_disk;
- adisk->dev = mk_kdev(added_desc->major,added_desc->minor);
- /* it will be held open by rdev */
- adisk->bdev = bdget(kdev_t_to_nr(adisk->dev));
+ print_multipath_conf(conf);
+ return err;
+}
- adisk->operational = 0;
- adisk->spare = 1;
- adisk->used_slot = 1;
- conf->nr_disks++;
+static int multipath_remove_disk(mddev_t *mddev, int number)
+{
+ multipath_conf_t *conf = mddev->private;
+ int err = 1;
+ int i;
- break;
+ print_multipath_conf(conf);
+ spin_lock_irq(&conf->device_lock);
- default:
- MD_BUG();
- err = 1;
- goto abort;
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ struct multipath_info *p = conf->multipaths + i;
+ if (p->used_slot && (p->number == number)) {
+ if (p->operational) {
+ printk(KERN_ERR "hot-remove-disk, slot %d is identified to be the requested disk (number %d), but is still operational!\n", i, number);
+ err = -EBUSY;
+ goto abort;
+ }
+ if (p->spare && i < conf->raid_disks)
+ break;
+ p->dev = NODEV;
+ p->bdev = NULL;
+ p->used_slot = 0;
+ conf->nr_disks--;
+ err = 0;
+ break;
+ }
}
+ if (err)
+ MD_BUG();
abort:
spin_unlock_irq(&conf->device_lock);
return err;
}
-
#define IO_ERROR KERN_ALERT \
"multipath: %s: unrecoverable IO read error for block %lu\n"
stop: multipath_stop,
status: multipath_status,
error_handler: multipath_error,
- diskop: multipath_diskop,
+ hot_add_disk: multipath_add_disk,
+ hot_remove_disk:multipath_remove_disk,
+ spare_inactive: multipath_spare_inactive,
+ spare_active: multipath_spare_active,
+ spare_write: multipath_spare_write,
};
static int __init multipath_init (void)
conf->r1buf_pool = NULL;
}
-static int diskop(mddev_t *mddev, mdp_disk_t **d, int state)
+static mirror_info_t *find_spare(mddev_t *mddev, int number)
+{
+ conf_t *conf = mddev->private;
+ int i;
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ mirror_info_t *p = conf->mirrors + i;
+ if (p->spare && p->number == number)
+ return p;
+ }
+ return NULL;
+}
+
+static int raid1_spare_active(mddev_t *mddev, mdp_disk_t **d)
{
int err = 0;
- int i, failed_disk = -1, spare_disk = -1, removed_disk = -1, added_disk = -1;
+ int i, failed_disk = -1, spare_disk = -1;
conf_t *conf = mddev->private;
- mirror_info_t *tmp, *sdisk, *fdisk, *rdisk, *adisk;
+ mirror_info_t *tmp, *sdisk, *fdisk;
mdp_super_t *sb = mddev->sb;
- mdp_disk_t *failed_desc, *spare_desc, *added_desc;
+ mdp_disk_t *failed_desc, *spare_desc;
mdk_rdev_t *spare_rdev, *failed_rdev;
- struct block_device *bdev;
print_conf(conf);
spin_lock_irq(&conf->device_lock);
/*
- * find the disk ...
+ * Find the failed disk within the RAID1 configuration ...
+ * (this can only be in the first conf->working_disks part)
*/
- switch (state) {
-
- case DISKOP_SPARE_ACTIVE:
-
- /*
- * Find the failed disk within the RAID1 configuration ...
- * (this can only be in the first conf->working_disks part)
- */
- for (i = 0; i < conf->raid_disks; i++) {
- tmp = conf->mirrors + i;
- if ((!tmp->operational && !tmp->spare) ||
- !tmp->used_slot) {
- failed_disk = i;
- break;
- }
+ for (i = 0; i < conf->raid_disks; i++) {
+ tmp = conf->mirrors + i;
+ if ((!tmp->operational && !tmp->spare) ||
+ !tmp->used_slot) {
+ failed_disk = i;
+ break;
}
- /*
- * When we activate a spare disk we _must_ have a disk in
- * the lower (active) part of the array to replace.
- */
- if ((failed_disk == -1) || (failed_disk >= conf->raid_disks)) {
- MD_BUG();
- err = 1;
- goto abort;
+ }
+ /*
+ * When we activate a spare disk we _must_ have a disk in
+ * the lower (active) part of the array to replace.
+ */
+ if (failed_disk == -1) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
+ /*
+ * Find the spare disk ... (can only be in the 'high'
+ * area of the array)
+ */
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ tmp = conf->mirrors + i;
+ if (tmp->spare && tmp->number == (*d)->number) {
+ spare_disk = i;
+ break;
}
- /* fall through */
-
- case DISKOP_SPARE_WRITE:
- case DISKOP_SPARE_INACTIVE:
+ }
+ if (spare_disk == -1) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
- /*
- * Find the spare disk ... (can only be in the 'high'
- * area of the array)
- */
- for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
- tmp = conf->mirrors + i;
- if (tmp->spare && tmp->number == (*d)->number) {
- spare_disk = i;
- break;
- }
- }
- if (spare_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
-
- case DISKOP_HOT_REMOVE_DISK:
-
- for (i = 0; i < MD_SB_DISKS; i++) {
- tmp = conf->mirrors + i;
- if (tmp->used_slot && (tmp->number == (*d)->number)) {
- if (tmp->operational) {
- err = -EBUSY;
- goto abort;
- }
- removed_disk = i;
- break;
- }
- }
- if (removed_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
+ sdisk = conf->mirrors + spare_disk;
+ fdisk = conf->mirrors + failed_disk;
- case DISKOP_HOT_ADD_DISK:
+ spare_desc = &sb->disks[sdisk->number];
+ failed_desc = &sb->disks[fdisk->number];
- for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
- tmp = conf->mirrors + i;
- if (!tmp->used_slot) {
- added_disk = i;
- break;
- }
- }
- if (added_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
+ if (spare_desc != *d || spare_desc->raid_disk != sdisk->raid_disk ||
+ sdisk->raid_disk != spare_disk || fdisk->raid_disk != failed_disk ||
+ failed_desc->raid_disk != fdisk->raid_disk) {
+ MD_BUG();
+ err = 1;
+ goto abort;
}
- switch (state) {
- /*
- * Switch the spare disk to write-only mode:
- */
- case DISKOP_SPARE_WRITE:
- sdisk = conf->mirrors + spare_disk;
- sdisk->operational = 1;
- sdisk->write_only = 1;
- break;
/*
- * Deactivate a spare disk:
+ * do the switch finally
*/
- case DISKOP_SPARE_INACTIVE:
- sdisk = conf->mirrors + spare_disk;
- sdisk->operational = 0;
- sdisk->write_only = 0;
- break;
+ spare_rdev = find_rdev_nr(mddev, spare_desc->number);
+ failed_rdev = find_rdev_nr(mddev, failed_desc->number);
+
/*
- * Activate (mark read-write) the (now sync) spare disk,
- * which means we switch it's 'raid position' (->raid_disk)
- * with the failed disk. (only the first 'conf->nr_disks'
- * slots are used for 'real' disks and we must preserve this
- * property)
+ * There must be a spare_rdev, but there may not be a
+ * failed_rdev. That slot might be empty...
*/
- case DISKOP_SPARE_ACTIVE:
- sdisk = conf->mirrors + spare_disk;
- fdisk = conf->mirrors + failed_disk;
-
- spare_desc = &sb->disks[sdisk->number];
- failed_desc = &sb->disks[fdisk->number];
-
- if (spare_desc != *d) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ spare_rdev->desc_nr = failed_desc->number;
+ if (failed_rdev)
+ failed_rdev->desc_nr = spare_desc->number;
- if (spare_desc->raid_disk != sdisk->raid_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
-
- if (sdisk->raid_disk != spare_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ xchg_values(*spare_desc, *failed_desc);
+ xchg_values(*fdisk, *sdisk);
- if (failed_desc->raid_disk != fdisk->raid_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
-
- if (fdisk->raid_disk != failed_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ /*
+ * (careful, 'failed' and 'spare' are switched from now on)
+ *
+ * we want to preserve linear numbering and we want to
+ * give the proper raid_disk number to the now activated
+ * disk. (this means we switch back these values)
+ */
+ xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
+ xchg_values(sdisk->raid_disk, fdisk->raid_disk);
+ xchg_values(spare_desc->number, failed_desc->number);
+ xchg_values(sdisk->number, fdisk->number);
- /*
- * do the switch finally
- */
- spare_rdev = find_rdev_nr(mddev, spare_desc->number);
- failed_rdev = find_rdev_nr(mddev, failed_desc->number);
+ *d = failed_desc;
- /*
- * There must be a spare_rdev, but there may not be a
- * failed_rdev. That slot might be empty...
- */
- spare_rdev->desc_nr = failed_desc->number;
- if (failed_rdev)
- failed_rdev->desc_nr = spare_desc->number;
+ if (!sdisk->bdev)
+ sdisk->used_slot = 0;
+ /*
+ * this really activates the spare.
+ */
+ fdisk->spare = 0;
+ fdisk->write_only = 0;
- xchg_values(*spare_desc, *failed_desc);
- xchg_values(*fdisk, *sdisk);
+ /*
+ * if we activate a spare, we definitely replace a
+ * non-operational disk slot in the 'low' area of
+ * the disk array.
+ */
- /*
- * (careful, 'failed' and 'spare' are switched from now on)
- *
- * we want to preserve linear numbering and we want to
- * give the proper raid_disk number to the now activated
- * disk. (this means we switch back these values)
- */
- xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
- xchg_values(sdisk->raid_disk, fdisk->raid_disk);
- xchg_values(spare_desc->number, failed_desc->number);
- xchg_values(sdisk->number, fdisk->number);
+ conf->working_disks++;
+abort:
+ spin_unlock_irq(&conf->device_lock);
- *d = failed_desc;
+ print_conf(conf);
+ return err;
+}
- if (!sdisk->bdev)
- sdisk->used_slot = 0;
- /*
- * this really activates the spare.
- */
- fdisk->spare = 0;
- fdisk->write_only = 0;
+static int raid1_spare_inactive(mddev_t *mddev)
+{
+ conf_t *conf = mddev->private;
+ mirror_info_t *p;
+ int err = 0;
- /*
- * if we activate a spare, we definitely replace a
- * non-operational disk slot in the 'low' area of
- * the disk array.
- */
+ print_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ p = find_spare(mddev, mddev->spare->number);
+ if (p) {
+ p->operational = 0;
+ p->write_only = 0;
+ } else {
+ MD_BUG();
+ err = 1;
+ }
+ spin_unlock_irq(&conf->device_lock);
+ print_conf(conf);
+ return err;
+}
- conf->working_disks++;
+static int raid1_spare_write(mddev_t *mddev, int number)
+{
+ conf_t *conf = mddev->private;
+ mirror_info_t *p;
+ int err = 0;
- break;
+ print_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ p = find_spare(mddev, number);
+ if (p) {
+ p->operational = 1;
+ p->write_only = 1;
+ } else {
+ MD_BUG();
+ err = 1;
+ }
+ spin_unlock_irq(&conf->device_lock);
+ print_conf(conf);
+ return err;
+}
- case DISKOP_HOT_REMOVE_DISK:
- rdisk = conf->mirrors + removed_disk;
+static int raid1_add_disk(mddev_t *mddev, mdp_disk_t *added_desc,
+ mdk_rdev_t *rdev)
+{
+ conf_t *conf = mddev->private;
+ int err = 1;
+ int i;
- if (rdisk->spare && (removed_disk < conf->raid_disks)) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- bdev = rdisk->bdev;
- rdisk->dev = NODEV;
- rdisk->bdev = NULL;
- rdisk->used_slot = 0;
- conf->nr_disks--;
- bdput(bdev);
- break;
-
- case DISKOP_HOT_ADD_DISK:
- adisk = conf->mirrors + added_disk;
- added_desc = *d;
-
- if (added_disk != added_desc->number) {
- MD_BUG();
- err = 1;
- goto abort;
+ print_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ /*
+ * find the disk ...
+ */
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ mirror_info_t *p = conf->mirrors + i;
+ if (!p->used_slot) {
+ if (added_desc->number != i)
+ break;
+ p->number = added_desc->number;
+ p->raid_disk = added_desc->raid_disk;
+ p->dev = rdev->dev;
+ /* it will be held open by rdev */
+ p->bdev = rdev->bdev;
+ p->operational = 0;
+ p->write_only = 0;
+ p->spare = 1;
+ p->used_slot = 1;
+ p->head_position = 0;
+ conf->nr_disks++;
+ err = 0;
+ break;
}
+ }
+ if (err)
+ MD_BUG();
+ spin_unlock_irq(&conf->device_lock);
- adisk->number = added_desc->number;
- adisk->raid_disk = added_desc->raid_disk;
- adisk->dev = mk_kdev(added_desc->major, added_desc->minor);
- /* it will be held open by rdev */
- adisk->bdev = bdget(kdev_t_to_nr(adisk->dev));
-
- adisk->operational = 0;
- adisk->write_only = 0;
- adisk->spare = 1;
- adisk->used_slot = 1;
- adisk->head_position = 0;
- conf->nr_disks++;
+ print_conf(conf);
+ return err;
+}
- break;
+static int raid1_remove_disk(mddev_t *mddev, int number)
+{
+ conf_t *conf = mddev->private;
+ int err = 1;
+ int i;
- default:
- MD_BUG();
- err = 1;
- goto abort;
+ print_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ mirror_info_t *p = conf->mirrors + i;
+ if (p->used_slot && (p->number == number)) {
+ if (p->operational) {
+ err = -EBUSY;
+ goto abort;
+ }
+ if (p->spare && (i < conf->raid_disks))
+ break;
+ p->dev = NODEV;
+ p->bdev = NULL;
+ p->used_slot = 0;
+ conf->nr_disks--;
+ err = 0;
+ break;
+ }
}
+ if (err)
+ MD_BUG();
abort:
spin_unlock_irq(&conf->device_lock);
return err;
}
-
#define IO_ERROR KERN_ALERT \
"raid1: %s: unrecoverable I/O read error for block %lu\n"
stop: stop,
status: status,
error_handler: error,
- diskop: diskop,
+ hot_add_disk: raid1_add_disk,
+ hot_remove_disk:raid1_remove_disk,
+ spare_write: raid1_spare_write,
+ spare_inactive: raid1_spare_inactive,
+ spare_active: raid1_spare_active,
sync_request: sync_request
};
}
}
-static int diskop(mddev_t *mddev, mdp_disk_t **d, int state)
+static struct disk_info *find_spare(mddev_t *mddev, int number)
+{
+ raid5_conf_t *conf = mddev->private;
+ int i;
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ struct disk_info *p = conf->disks + i;
+ if (p->spare && p->number == number)
+ return p;
+ }
+ return NULL;
+}
+
+static int raid5_spare_active(mddev_t *mddev, mdp_disk_t **d)
{
int err = 0;
- int i, failed_disk=-1, spare_disk=-1, removed_disk=-1, added_disk=-1;
+ int i, failed_disk=-1, spare_disk=-1;
raid5_conf_t *conf = mddev->private;
- struct disk_info *tmp, *sdisk, *fdisk, *rdisk, *adisk;
+ struct disk_info *tmp, *sdisk, *fdisk;
mdp_super_t *sb = mddev->sb;
- mdp_disk_t *failed_desc, *spare_desc, *added_desc;
+ mdp_disk_t *failed_desc, *spare_desc;
mdk_rdev_t *spare_rdev, *failed_rdev;
print_raid5_conf(conf);
spin_lock_irq(&conf->device_lock);
+ for (i = 0; i < conf->raid_disks; i++) {
+ tmp = conf->disks + i;
+ if ((!tmp->operational && !tmp->spare) ||
+ !tmp->used_slot) {
+ failed_disk = i;
+ break;
+ }
+ }
+ if (failed_disk == -1) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
/*
- * find the disk ...
+ * Find the spare disk ... (can only be in the 'high'
+ * area of the array)
*/
- switch (state) {
-
- case DISKOP_SPARE_ACTIVE:
-
- /*
- * Find the failed disk within the RAID5 configuration ...
- * (this can only be in the first conf->raid_disks part)
- */
- for (i = 0; i < conf->raid_disks; i++) {
- tmp = conf->disks + i;
- if ((!tmp->operational && !tmp->spare) ||
- !tmp->used_slot) {
- failed_disk = i;
- break;
- }
- }
- /*
- * When we activate a spare disk we _must_ have a disk in
- * the lower (active) part of the array to replace.
- */
- if ((failed_disk == -1) || (failed_disk >= conf->raid_disks)) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- /* fall through */
-
- case DISKOP_SPARE_WRITE:
- case DISKOP_SPARE_INACTIVE:
-
- /*
- * Find the spare disk ... (can only be in the 'high'
- * area of the array)
- */
- for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
- tmp = conf->disks + i;
- if (tmp->spare && tmp->number == (*d)->number) {
- spare_disk = i;
- break;
- }
- }
- if (spare_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ tmp = conf->disks + i;
+ if (tmp->spare && tmp->number == (*d)->number) {
+ spare_disk = i;
+ break;
}
- break;
-
- case DISKOP_HOT_REMOVE_DISK:
+ }
+ if (spare_disk == -1) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
- for (i = 0; i < MD_SB_DISKS; i++) {
- tmp = conf->disks + i;
- if (tmp->used_slot && (tmp->number == (*d)->number)) {
- if (tmp->operational) {
- err = -EBUSY;
- goto abort;
- }
- removed_disk = i;
- break;
- }
- }
- if (removed_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
+ if (!conf->spare) {
+ MD_BUG();
+ err = 1;
+ goto abort;
+ }
+ sdisk = conf->disks + spare_disk;
+ fdisk = conf->disks + failed_disk;
- case DISKOP_HOT_ADD_DISK:
+ spare_desc = &sb->disks[sdisk->number];
+ failed_desc = &sb->disks[fdisk->number];
- for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
- tmp = conf->disks + i;
- if (!tmp->used_slot) {
- added_disk = i;
- break;
- }
- }
- if (added_disk == -1) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- break;
+ if (spare_desc != *d || spare_desc->raid_disk != sdisk->raid_disk ||
+ sdisk->raid_disk != spare_disk || fdisk->raid_disk != failed_disk ||
+ failed_desc->raid_disk != fdisk->raid_disk) {
+ MD_BUG();
+ err = 1;
+ goto abort;
}
- switch (state) {
/*
- * Switch the spare disk to write-only mode:
+ * do the switch finally
*/
- case DISKOP_SPARE_WRITE:
- if (conf->spare) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- sdisk = conf->disks + spare_disk;
- sdisk->operational = 1;
- sdisk->write_only = 1;
- conf->spare = sdisk;
- break;
- /*
- * Deactivate a spare disk:
+ spare_rdev = find_rdev_nr(mddev, spare_desc->number);
+ failed_rdev = find_rdev_nr(mddev, failed_desc->number);
+
+ /* There must be a spare_rdev, but there may not be a
+ * failed_rdev. That slot might be empty...
*/
- case DISKOP_SPARE_INACTIVE:
- sdisk = conf->disks + spare_disk;
- sdisk->operational = 0;
- sdisk->write_only = 0;
- /*
- * Was the spare being resynced?
- */
- if (conf->spare == sdisk)
- conf->spare = NULL;
- break;
+ spare_rdev->desc_nr = failed_desc->number;
+ if (failed_rdev)
+ failed_rdev->desc_nr = spare_desc->number;
+
+ xchg_values(*spare_desc, *failed_desc);
+ xchg_values(*fdisk, *sdisk);
+
/*
- * Activate (mark read-write) the (now sync) spare disk,
- * which means we switch it's 'raid position' (->raid_disk)
- * with the failed disk. (only the first 'conf->raid_disks'
- * slots are used for 'real' disks and we must preserve this
- * property)
+ * (careful, 'failed' and 'spare' are switched from now on)
+ *
+ * we want to preserve linear numbering and we want to
+ * give the proper raid_disk number to the now activated
+ * disk. (this means we switch back these values)
*/
- case DISKOP_SPARE_ACTIVE:
- if (!conf->spare) {
- MD_BUG();
- err = 1;
- goto abort;
- }
- sdisk = conf->disks + spare_disk;
- fdisk = conf->disks + failed_disk;
- spare_desc = &sb->disks[sdisk->number];
- failed_desc = &sb->disks[fdisk->number];
+ xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
+ xchg_values(sdisk->raid_disk, fdisk->raid_disk);
+ xchg_values(spare_desc->number, failed_desc->number);
+ xchg_values(sdisk->number, fdisk->number);
- if (spare_desc != *d) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ *d = failed_desc;
- if (spare_desc->raid_disk != sdisk->raid_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
-
- if (sdisk->raid_disk != spare_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
+ if (!sdisk->bdev)
+ sdisk->used_slot = 0;
- if (failed_desc->raid_disk != fdisk->raid_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
-
- if (fdisk->raid_disk != failed_disk) {
- MD_BUG();
- err = 1;
- goto abort;
- }
-
- /*
- * do the switch finally
- */
- spare_rdev = find_rdev_nr(mddev, spare_desc->number);
- failed_rdev = find_rdev_nr(mddev, failed_desc->number);
-
- /* There must be a spare_rdev, but there may not be a
- * failed_rdev. That slot might be empty...
- */
- spare_rdev->desc_nr = failed_desc->number;
- if (failed_rdev)
- failed_rdev->desc_nr = spare_desc->number;
-
- xchg_values(*spare_desc, *failed_desc);
- xchg_values(*fdisk, *sdisk);
+ /*
+ * this really activates the spare.
+ */
+ fdisk->spare = 0;
+ fdisk->write_only = 0;
- /*
- * (careful, 'failed' and 'spare' are switched from now on)
- *
- * we want to preserve linear numbering and we want to
- * give the proper raid_disk number to the now activated
- * disk. (this means we switch back these values)
- */
-
- xchg_values(spare_desc->raid_disk, failed_desc->raid_disk);
- xchg_values(sdisk->raid_disk, fdisk->raid_disk);
- xchg_values(spare_desc->number, failed_desc->number);
- xchg_values(sdisk->number, fdisk->number);
+ /*
+ * if we activate a spare, we definitely replace a
+ * non-operational disk slot in the 'low' area of
+ * the disk array.
+ */
+ conf->failed_disks--;
+ conf->working_disks++;
+ conf->spare = NULL;
+abort:
+ spin_unlock_irq(&conf->device_lock);
+ print_raid5_conf(conf);
+ return err;
+}
- *d = failed_desc;
+static int raid5_spare_inactive(mddev_t *mddev)
+{
+ raid5_conf_t *conf = mddev->private;
+ struct disk_info *p;
+ int err = 0;
- if (!sdisk->bdev)
- sdisk->used_slot = 0;
+ print_raid5_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ p = find_spare(mddev, mddev->spare->number);
+ if (p) {
+ p->operational = 0;
+ p->write_only = 0;
+ if (conf->spare == p)
+ conf->spare = NULL;
+ } else {
+ MD_BUG();
+ err = 1;
+ }
+ spin_unlock_irq(&conf->device_lock);
+ print_raid5_conf(conf);
+ return err;
+}
- /*
- * this really activates the spare.
- */
- fdisk->spare = 0;
- fdisk->write_only = 0;
+static int raid5_spare_write(mddev_t *mddev, int number)
+{
+ raid5_conf_t *conf = mddev->private;
+ struct disk_info *p;
+ int err = 0;
- /*
- * if we activate a spare, we definitely replace a
- * non-operational disk slot in the 'low' area of
- * the disk array.
- */
- conf->failed_disks--;
- conf->working_disks++;
- conf->spare = NULL;
+ print_raid5_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ p = find_spare(mddev, number);
+ if (p && !conf->spare) {
+ p->operational = 1;
+ p->write_only = 1;
+ conf->spare = p;
+ } else {
+ MD_BUG();
+ err = 1;
+ }
+ spin_unlock_irq(&conf->device_lock);
+ print_raid5_conf(conf);
+ return err;
+}
- break;
+static int raid5_remove_disk(mddev_t *mddev, int number)
+{
+ raid5_conf_t *conf = mddev->private;
+ int err = 1;
+ int i;
- case DISKOP_HOT_REMOVE_DISK:
- rdisk = conf->disks + removed_disk;
+ print_raid5_conf(conf);
+ spin_lock_irq(&conf->device_lock);
- if (rdisk->spare && (removed_disk < conf->raid_disks)) {
- MD_BUG();
- err = 1;
- goto abort;
+ for (i = 0; i < MD_SB_DISKS; i++) {
+ struct disk_info *p = conf->disks + i;
+ if (p->used_slot && p->number == number) {
+ if (p->operational) {
+ err = -EBUSY;
+ goto abort;
+ }
+ if (p->spare && i < conf->raid_disks)
+ break;
+ p->bdev = NULL;
+ p->used_slot = 0;
+ err = 0;
+ break;
}
- rdisk->bdev = NULL;
- rdisk->used_slot = 0;
+ }
+ if (err)
+ MD_BUG();
+abort:
+ spin_unlock_irq(&conf->device_lock);
+ print_raid5_conf(conf);
+ return err;
+}
- break;
+static int raid5_add_disk(mddev_t *mddev, mdp_disk_t *added_desc,
+ mdk_rdev_t *rdev)
+{
+ raid5_conf_t *conf = mddev->private;
+ int err = 1;
+ int i;
- case DISKOP_HOT_ADD_DISK:
- adisk = conf->disks + added_disk;
- added_desc = *d;
+ print_raid5_conf(conf);
+ spin_lock_irq(&conf->device_lock);
+ /*
+ * find the disk ...
+ */
- if (added_disk != added_desc->number) {
- MD_BUG();
- err = 1;
- goto abort;
+ for (i = conf->raid_disks; i < MD_SB_DISKS; i++) {
+ struct disk_info *p = conf->disks + i;
+ if (!p->used_slot) {
+ if (added_desc->number != i)
+ break;
+ p->number = added_desc->number;
+ p->raid_disk = added_desc->raid_disk;
+ /* it will be held open by rdev */
+ p->bdev = rdev->bdev;
+ p->operational = 0;
+ p->write_only = 0;
+ p->spare = 1;
+ p->used_slot = 1;
+ err = 0;
+ break;
}
-
- adisk->number = added_desc->number;
- adisk->raid_disk = added_desc->raid_disk;
- /* it will be held open by rdev */
- adisk->bdev = bdget(MKDEV(added_desc->major,added_desc->minor));
-
- adisk->operational = 0;
- adisk->write_only = 0;
- adisk->spare = 1;
- adisk->used_slot = 1;
-
-
- break;
-
- default:
- MD_BUG();
- err = 1;
- goto abort;
}
-abort:
+ if (err)
+ MD_BUG();
spin_unlock_irq(&conf->device_lock);
print_raid5_conf(conf);
return err;
stop: stop,
status: status,
error_handler: error,
- diskop: diskop,
+ hot_add_disk: raid5_add_disk,
+ hot_remove_disk:raid5_remove_disk,
+ spare_write: raid5_spare_write,
+ spare_inactive: raid5_spare_inactive,
+ spare_active: raid5_spare_active,
sync_request: sync_request
};
* Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
*/
-#include <linux/config.h>
+#include <linux/init.h>
#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/kernel.h>
-#include <linux/major.h>
#include <linux/blk.h>
-#include <linux/init.h>
-#include <linux/raid/md.h>
#include <linux/buffer_head.h> /* for invalidate_bdev() */
#include "check.h"
int desc_nr; /* descriptor index in the superblock */
};
-
-/*
- * disk operations in a working array:
- */
-#define DISKOP_SPARE_INACTIVE 0
-#define DISKOP_SPARE_WRITE 1
-#define DISKOP_SPARE_ACTIVE 2
-#define DISKOP_HOT_REMOVE_DISK 3
-#define DISKOP_HOT_ADD_DISK 4
-
typedef struct mdk_personality_s mdk_personality_t;
struct mddev_s
int (*stop)(mddev_t *mddev);
int (*status)(char *page, mddev_t *mddev);
int (*error_handler)(mddev_t *mddev, struct block_device *bdev);
-
-/*
- * Some personalities (RAID-1, RAID-5) can have disks hot-added and
- * hot-removed. Hot removal is different from failure. (failure marks
- * a disk inactive, but the disk is still part of the array) The interface
- * to such operations is the 'pers->diskop()' function, can be NULL.
- *
- * the diskop function can change the pointer pointing to the incoming
- * descriptor, but must do so very carefully. (currently only
- * SPARE_ACTIVE expects such a change)
- */
- int (*diskop) (mddev_t *mddev, mdp_disk_t **descriptor, int state);
+ int (*hot_add_disk) (mddev_t *mddev, mdp_disk_t *descriptor, mdk_rdev_t *rdev);
+ int (*hot_remove_disk) (mddev_t *mddev, int number);
+ int (*spare_write) (mddev_t *mddev, int number);
+ int (*spare_inactive) (mddev_t *mddev);
+ int (*spare_active) (mddev_t *mddev, mdp_disk_t **descriptor);
int (*sync_request)(mddev_t *mddev, sector_t sector_nr, int go_faster);
};
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