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Diffstat (limited to 'drivers/md/raid5.c')
-rw-r--r--drivers/md/raid5.c233
1 files changed, 128 insertions, 105 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 15348c393b5d..d2c0f94fa37d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -53,6 +53,7 @@
#include <linux/slab.h>
#include "md.h"
#include "raid5.h"
+#include "raid0.h"
#include "bitmap.h"
/*
@@ -1509,7 +1510,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
set_bit(R5_UPTODATE, &sh->dev[i].flags);
if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
rdev = conf->disks[i].rdev;
- printk_rl(KERN_INFO "raid5:%s: read error corrected"
+ printk_rl(KERN_INFO "md/raid:%s: read error corrected"
" (%lu sectors at %llu on %s)\n",
mdname(conf->mddev), STRIPE_SECTORS,
(unsigned long long)(sh->sector
@@ -1529,7 +1530,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
atomic_inc(&rdev->read_errors);
if (conf->mddev->degraded >= conf->max_degraded)
printk_rl(KERN_WARNING
- "raid5:%s: read error not correctable "
+ "md/raid:%s: read error not correctable "
"(sector %llu on %s).\n",
mdname(conf->mddev),
(unsigned long long)(sh->sector
@@ -1538,7 +1539,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
else if (test_bit(R5_ReWrite, &sh->dev[i].flags))
/* Oh, no!!! */
printk_rl(KERN_WARNING
- "raid5:%s: read error NOT corrected!! "
+ "md/raid:%s: read error NOT corrected!! "
"(sector %llu on %s).\n",
mdname(conf->mddev),
(unsigned long long)(sh->sector
@@ -1547,7 +1548,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
else if (atomic_read(&rdev->read_errors)
> conf->max_nr_stripes)
printk(KERN_WARNING
- "raid5:%s: Too many read errors, failing device %s.\n",
+ "md/raid:%s: Too many read errors, failing device %s.\n",
mdname(conf->mddev), bdn);
else
retry = 1;
@@ -1619,8 +1620,8 @@ static void raid5_build_block(struct stripe_head *sh, int i, int previous)
static void error(mddev_t *mddev, mdk_rdev_t *rdev)
{
char b[BDEVNAME_SIZE];
- raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
- pr_debug("raid5: error called\n");
+ raid5_conf_t *conf = mddev->private;
+ pr_debug("raid456: error called\n");
if (!test_bit(Faulty, &rdev->flags)) {
set_bit(MD_CHANGE_DEVS, &mddev->flags);
@@ -1636,9 +1637,13 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
}
set_bit(Faulty, &rdev->flags);
printk(KERN_ALERT
- "raid5: Disk failure on %s, disabling device.\n"
- "raid5: Operation continuing on %d devices.\n",
- bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
+ "md/raid:%s: Disk failure on %s, disabling device.\n"
+ KERN_ALERT
+ "md/raid:%s: Operation continuing on %d devices.\n",
+ mdname(mddev),
+ bdevname(rdev->bdev, b),
+ mdname(mddev),
+ conf->raid_disks - mddev->degraded);
}
}
@@ -1714,8 +1719,6 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
pd_idx = data_disks;
break;
default:
- printk(KERN_ERR "raid5: unsupported algorithm %d\n",
- algorithm);
BUG();
}
break;
@@ -1832,10 +1835,7 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
qd_idx = raid_disks - 1;
break;
-
default:
- printk(KERN_CRIT "raid6: unsupported algorithm %d\n",
- algorithm);
BUG();
}
break;
@@ -1898,8 +1898,6 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
case ALGORITHM_PARITY_N:
break;
default:
- printk(KERN_ERR "raid5: unsupported algorithm %d\n",
- algorithm);
BUG();
}
break;
@@ -1958,8 +1956,6 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
i -= 1;
break;
default:
- printk(KERN_CRIT "raid6: unsupported algorithm %d\n",
- algorithm);
BUG();
}
break;
@@ -1972,7 +1968,8 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
previous, &dummy1, &sh2);
if (check != sh->sector || dummy1 != dd_idx || sh2.pd_idx != sh->pd_idx
|| sh2.qd_idx != sh->qd_idx) {
- printk(KERN_ERR "compute_blocknr: map not correct\n");
+ printk(KERN_ERR "md/raid:%s: compute_blocknr: map not correct\n",
+ mdname(conf->mddev));
return 0;
}
return r_sector;
@@ -3709,10 +3706,10 @@ static void raid5_align_endio(struct bio *bi, int error)
bio_put(bi);
- mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata;
- conf = mddev->private;
rdev = (void*)raid_bi->bi_next;
raid_bi->bi_next = NULL;
+ mddev = rdev->mddev;
+ conf = mddev->private;
rdev_dec_pending(rdev, conf->mddev);
@@ -3749,9 +3746,8 @@ static int bio_fits_rdev(struct bio *bi)
}
-static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio)
+static int chunk_aligned_read(mddev_t *mddev, struct bio * raid_bio)
{
- mddev_t *mddev = q->queuedata;
raid5_conf_t *conf = mddev->private;
int dd_idx;
struct bio* align_bi;
@@ -3866,16 +3862,15 @@ static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf)
return sh;
}
-static int make_request(struct request_queue *q, struct bio * bi)
+static int make_request(mddev_t *mddev, struct bio * bi)
{
- mddev_t *mddev = q->queuedata;
raid5_conf_t *conf = mddev->private;
int dd_idx;
sector_t new_sector;
sector_t logical_sector, last_sector;
struct stripe_head *sh;
const int rw = bio_data_dir(bi);
- int cpu, remaining;
+ int remaining;
if (unlikely(bio_rw_flagged(bi, BIO_RW_BARRIER))) {
/* Drain all pending writes. We only really need
@@ -3890,15 +3885,9 @@ static int make_request(struct request_queue *q, struct bio * bi)
md_write_start(mddev, bi);
- cpu = part_stat_lock();
- part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
- part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
- bio_sectors(bi));
- part_stat_unlock();
-
if (rw == READ &&
mddev->reshape_position == MaxSector &&
- chunk_aligned_read(q,bi))
+ chunk_aligned_read(mddev,bi))
return 0;
logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1);
@@ -3946,7 +3935,7 @@ static int make_request(struct request_queue *q, struct bio * bi)
new_sector = raid5_compute_sector(conf, logical_sector,
previous,
&dd_idx, NULL);
- pr_debug("raid5: make_request, sector %llu logical %llu\n",
+ pr_debug("raid456: make_request, sector %llu logical %llu\n",
(unsigned long long)new_sector,
(unsigned long long)logical_sector);
@@ -4054,7 +4043,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
* As the reads complete, handle_stripe will copy the data
* into the destination stripe and release that stripe.
*/
- raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+ raid5_conf_t *conf = mddev->private;
struct stripe_head *sh;
sector_t first_sector, last_sector;
int raid_disks = conf->previous_raid_disks;
@@ -4263,7 +4252,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
/* FIXME go_faster isn't used */
static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
- raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+ raid5_conf_t *conf = mddev->private;
struct stripe_head *sh;
sector_t max_sector = mddev->dev_sectors;
int sync_blocks;
@@ -4656,7 +4645,7 @@ static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action,
kfree(percpu->scribble);
pr_err("%s: failed memory allocation for cpu%ld\n",
__func__, cpu);
- return NOTIFY_BAD;
+ return notifier_from_errno(-ENOMEM);
}
break;
case CPU_DEAD:
@@ -4725,7 +4714,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
if (mddev->new_level != 5
&& mddev->new_level != 4
&& mddev->new_level != 6) {
- printk(KERN_ERR "raid5: %s: raid level not set to 4/5/6 (%d)\n",
+ printk(KERN_ERR "md/raid:%s: raid level not set to 4/5/6 (%d)\n",
mdname(mddev), mddev->new_level);
return ERR_PTR(-EIO);
}
@@ -4733,12 +4722,12 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
&& !algorithm_valid_raid5(mddev->new_layout)) ||
(mddev->new_level == 6
&& !algorithm_valid_raid6(mddev->new_layout))) {
- printk(KERN_ERR "raid5: %s: layout %d not supported\n",
+ printk(KERN_ERR "md/raid:%s: layout %d not supported\n",
mdname(mddev), mddev->new_layout);
return ERR_PTR(-EIO);
}
if (mddev->new_level == 6 && mddev->raid_disks < 4) {
- printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n",
+ printk(KERN_ERR "md/raid:%s: not enough configured devices (%d, minimum 4)\n",
mdname(mddev), mddev->raid_disks);
return ERR_PTR(-EINVAL);
}
@@ -4746,8 +4735,8 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
if (!mddev->new_chunk_sectors ||
(mddev->new_chunk_sectors << 9) % PAGE_SIZE ||
!is_power_of_2(mddev->new_chunk_sectors)) {
- printk(KERN_ERR "raid5: invalid chunk size %d for %s\n",
- mddev->new_chunk_sectors << 9, mdname(mddev));
+ printk(KERN_ERR "md/raid:%s: invalid chunk size %d\n",
+ mdname(mddev), mddev->new_chunk_sectors << 9);
return ERR_PTR(-EINVAL);
}
@@ -4789,7 +4778,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
if (raid5_alloc_percpu(conf) != 0)
goto abort;
- pr_debug("raid5: run(%s) called.\n", mdname(mddev));
+ pr_debug("raid456: run(%s) called.\n", mdname(mddev));
list_for_each_entry(rdev, &mddev->disks, same_set) {
raid_disk = rdev->raid_disk;
@@ -4802,9 +4791,9 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
if (test_bit(In_sync, &rdev->flags)) {
char b[BDEVNAME_SIZE];
- printk(KERN_INFO "raid5: device %s operational as raid"
- " disk %d\n", bdevname(rdev->bdev,b),
- raid_disk);
+ printk(KERN_INFO "md/raid:%s: device %s operational as raid"
+ " disk %d\n",
+ mdname(mddev), bdevname(rdev->bdev, b), raid_disk);
} else
/* Cannot rely on bitmap to complete recovery */
conf->fullsync = 1;
@@ -4828,16 +4817,17 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
if (grow_stripes(conf, conf->max_nr_stripes)) {
printk(KERN_ERR
- "raid5: couldn't allocate %dkB for buffers\n", memory);
+ "md/raid:%s: couldn't allocate %dkB for buffers\n",
+ mdname(mddev), memory);
goto abort;
} else
- printk(KERN_INFO "raid5: allocated %dkB for %s\n",
- memory, mdname(mddev));
+ printk(KERN_INFO "md/raid:%s: allocated %dkB\n",
+ mdname(mddev), memory);
conf->thread = md_register_thread(raid5d, mddev, NULL);
if (!conf->thread) {
printk(KERN_ERR
- "raid5: couldn't allocate thread for %s\n",
+ "md/raid:%s: couldn't allocate thread.\n",
mdname(mddev));
goto abort;
}
@@ -4888,7 +4878,7 @@ static int run(mddev_t *mddev)
sector_t reshape_offset = 0;
if (mddev->recovery_cp != MaxSector)
- printk(KERN_NOTICE "raid5: %s is not clean"
+ printk(KERN_NOTICE "md/raid:%s: not clean"
" -- starting background reconstruction\n",
mdname(mddev));
if (mddev->reshape_position != MaxSector) {
@@ -4902,7 +4892,7 @@ static int run(mddev_t *mddev)
int max_degraded = (mddev->level == 6 ? 2 : 1);
if (mddev->new_level != mddev->level) {
- printk(KERN_ERR "raid5: %s: unsupported reshape "
+ printk(KERN_ERR "md/raid:%s: unsupported reshape "
"required - aborting.\n",
mdname(mddev));
return -EINVAL;
@@ -4915,8 +4905,8 @@ static int run(mddev_t *mddev)
here_new = mddev->reshape_position;
if (sector_div(here_new, mddev->new_chunk_sectors *
(mddev->raid_disks - max_degraded))) {
- printk(KERN_ERR "raid5: reshape_position not "
- "on a stripe boundary\n");
+ printk(KERN_ERR "md/raid:%s: reshape_position not "
+ "on a stripe boundary\n", mdname(mddev));
return -EINVAL;
}
reshape_offset = here_new * mddev->new_chunk_sectors;
@@ -4937,8 +4927,9 @@ static int run(mddev_t *mddev)
if ((here_new * mddev->new_chunk_sectors !=
here_old * mddev->chunk_sectors) ||
mddev->ro == 0) {
- printk(KERN_ERR "raid5: in-place reshape must be started"
- " in read-only mode - aborting\n");
+ printk(KERN_ERR "md/raid:%s: in-place reshape must be started"
+ " in read-only mode - aborting\n",
+ mdname(mddev));
return -EINVAL;
}
} else if (mddev->delta_disks < 0
@@ -4947,11 +4938,13 @@ static int run(mddev_t *mddev)
: (here_new * mddev->new_chunk_sectors >=
here_old * mddev->chunk_sectors)) {
/* Reading from the same stripe as writing to - bad */
- printk(KERN_ERR "raid5: reshape_position too early for "
- "auto-recovery - aborting.\n");
+ printk(KERN_ERR "md/raid:%s: reshape_position too early for "
+ "auto-recovery - aborting.\n",
+ mdname(mddev));
return -EINVAL;
}
- printk(KERN_INFO "raid5: reshape will continue\n");
+ printk(KERN_INFO "md/raid:%s: reshape will continue\n",
+ mdname(mddev));
/* OK, we should be able to continue; */
} else {
BUG_ON(mddev->level != mddev->new_level);
@@ -4993,18 +4986,6 @@ static int run(mddev_t *mddev)
mddev->minor_version > 90)
rdev->recovery_offset = reshape_offset;
- printk("%d: w=%d pa=%d pr=%d m=%d a=%d r=%d op1=%d op2=%d\n",
- rdev->raid_disk, working_disks, conf->prev_algo,
- conf->previous_raid_disks, conf->max_degraded,
- conf->algorithm, conf->raid_disks,
- only_parity(rdev->raid_disk,
- conf->prev_algo,
- conf->previous_raid_disks,
- conf->max_degraded),
- only_parity(rdev->raid_disk,
- conf->algorithm,
- conf->raid_disks,
- conf->max_degraded));
if (rdev->recovery_offset < reshape_offset) {
/* We need to check old and new layout */
if (!only_parity(rdev->raid_disk,
@@ -5025,7 +5006,7 @@ static int run(mddev_t *mddev)
- working_disks);
if (mddev->degraded > conf->max_degraded) {
- printk(KERN_ERR "raid5: not enough operational devices for %s"
+ printk(KERN_ERR "md/raid:%s: not enough operational devices"
" (%d/%d failed)\n",
mdname(mddev), mddev->degraded, conf->raid_disks);
goto abort;
@@ -5039,32 +5020,32 @@ static int run(mddev_t *mddev)
mddev->recovery_cp != MaxSector) {
if (mddev->ok_start_degraded)
printk(KERN_WARNING
- "raid5: starting dirty degraded array: %s"
- "- data corruption possible.\n",
+ "md/raid:%s: starting dirty degraded array"
+ " - data corruption possible.\n",
mdname(mddev));
else {
printk(KERN_ERR
- "raid5: cannot start dirty degraded array for %s\n",
+ "md/raid:%s: cannot start dirty degraded array.\n",
mdname(mddev));
goto abort;
}
}
if (mddev->degraded == 0)
- printk("raid5: raid level %d set %s active with %d out of %d"
- " devices, algorithm %d\n", conf->level, mdname(mddev),
+ printk(KERN_INFO "md/raid:%s: raid level %d active with %d out of %d"
+ " devices, algorithm %d\n", mdname(mddev), conf->level,
mddev->raid_disks-mddev->degraded, mddev->raid_disks,
mddev->new_layout);
else
- printk(KERN_ALERT "raid5: raid level %d set %s active with %d"
- " out of %d devices, algorithm %d\n", conf->level,
- mdname(mddev), mddev->raid_disks - mddev->degraded,
- mddev->raid_disks, mddev->new_layout);
+ printk(KERN_ALERT "md/raid:%s: raid level %d active with %d"
+ " out of %d devices, algorithm %d\n",
+ mdname(mddev), conf->level,
+ mddev->raid_disks - mddev->degraded,
+ mddev->raid_disks, mddev->new_layout);
print_raid5_conf(conf);
if (conf->reshape_progress != MaxSector) {
- printk("...ok start reshape thread\n");
conf->reshape_safe = conf->reshape_progress;
atomic_set(&conf->reshape_stripes, 0);
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
@@ -5087,9 +5068,11 @@ static int run(mddev_t *mddev)
}
/* Ok, everything is just fine now */
- if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group))
+ if (mddev->to_remove == &raid5_attrs_group)
+ mddev->to_remove = NULL;
+ else if (sysfs_create_group(&mddev->kobj, &raid5_attrs_group))
printk(KERN_WARNING
- "raid5: failed to create sysfs attributes for %s\n",
+ "md/raid:%s: failed to create sysfs attributes.\n",
mdname(mddev));
mddev->queue->queue_lock = &conf->device_lock;
@@ -5119,22 +5102,21 @@ abort:
free_conf(conf);
}
mddev->private = NULL;
- printk(KERN_ALERT "raid5: failed to run raid set %s\n", mdname(mddev));
+ printk(KERN_ALERT "md/raid:%s: failed to run raid set.\n", mdname(mddev));
return -EIO;
}
-
-
static int stop(mddev_t *mddev)
{
- raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+ raid5_conf_t *conf = mddev->private;
md_unregister_thread(mddev->thread);
mddev->thread = NULL;
mddev->queue->backing_dev_info.congested_fn = NULL;
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
free_conf(conf);
- mddev->private = &raid5_attrs_group;
+ mddev->private = NULL;
+ mddev->to_remove = &raid5_attrs_group;
return 0;
}
@@ -5175,7 +5157,7 @@ static void printall(struct seq_file *seq, raid5_conf_t *conf)
static void status(struct seq_file *seq, mddev_t *mddev)
{
- raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
+ raid5_conf_t *conf = mddev->private;
int i;
seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level,
@@ -5197,21 +5179,22 @@ static void print_raid5_conf (raid5_conf_t *conf)
int i;
struct disk_info *tmp;
- printk("RAID5 conf printout:\n");
+ printk(KERN_DEBUG "RAID conf printout:\n");
if (!conf) {
printk("(conf==NULL)\n");
return;
}
- printk(" --- rd:%d wd:%d\n", conf->raid_disks,
- conf->raid_disks - conf->mddev->degraded);
+ printk(KERN_DEBUG " --- level:%d rd:%d wd:%d\n", conf->level,
+ conf->raid_disks,
+ conf->raid_disks - conf->mddev->degraded);
for (i = 0; i < conf->raid_disks; i++) {
char b[BDEVNAME_SIZE];
tmp = conf->disks + i;
if (tmp->rdev)
- printk(" disk %d, o:%d, dev:%s\n",
- i, !test_bit(Faulty, &tmp->rdev->flags),
- bdevname(tmp->rdev->bdev,b));
+ printk(KERN_DEBUG " disk %d, o:%d, dev:%s\n",
+ i, !test_bit(Faulty, &tmp->rdev->flags),
+ bdevname(tmp->rdev->bdev, b));
}
}
@@ -5334,7 +5317,6 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
raid5_size(mddev, sectors, mddev->raid_disks))
return -EINVAL;
set_capacity(mddev->gendisk, mddev->array_sectors);
- mddev->changed = 1;
revalidate_disk(mddev->gendisk);
if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) {
mddev->recovery_cp = mddev->dev_sectors;
@@ -5360,7 +5342,8 @@ static int check_stripe_cache(mddev_t *mddev)
> conf->max_nr_stripes ||
((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
> conf->max_nr_stripes) {
- printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n",
+ printk(KERN_WARNING "md/raid:%s: reshape: not enough stripes. Needed %lu\n",
+ mdname(mddev),
((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9)
/ STRIPE_SIZE)*4);
return 0;
@@ -5431,7 +5414,7 @@ static int raid5_start_reshape(mddev_t *mddev)
*/
if (raid5_size(mddev, 0, conf->raid_disks + mddev->delta_disks)
< mddev->array_sectors) {
- printk(KERN_ERR "md: %s: array size must be reduced "
+ printk(KERN_ERR "md/raid:%s: array size must be reduced "
"before number of disks\n", mdname(mddev));
return -EINVAL;
}
@@ -5469,9 +5452,9 @@ static int raid5_start_reshape(mddev_t *mddev)
if (sysfs_create_link(&mddev->kobj,
&rdev->kobj, nm))
printk(KERN_WARNING
- "raid5: failed to create "
- " link %s for %s\n",
- nm, mdname(mddev));
+ "md/raid:%s: failed to create "
+ " link %s\n",
+ mdname(mddev), nm);
} else
break;
}
@@ -5548,7 +5531,6 @@ static void raid5_finish_reshape(mddev_t *mddev)
if (mddev->delta_disks > 0) {
md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
set_capacity(mddev->gendisk, mddev->array_sectors);
- mddev->changed = 1;
revalidate_disk(mddev->gendisk);
} else {
int d;
@@ -5613,6 +5595,29 @@ static void raid5_quiesce(mddev_t *mddev, int state)
}
+static void *raid45_takeover_raid0(mddev_t *mddev, int level)
+{
+ struct raid0_private_data *raid0_priv = mddev->private;
+
+ /* for raid0 takeover only one zone is supported */
+ if (raid0_priv->nr_strip_zones > 1) {
+ printk(KERN_ERR "md/raid:%s: cannot takeover raid0 with more than one zone.\n",
+ mdname(mddev));
+ return ERR_PTR(-EINVAL);
+ }
+
+ mddev->new_level = level;
+ mddev->new_layout = ALGORITHM_PARITY_N;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
+ mddev->raid_disks += 1;
+ mddev->delta_disks = 1;
+ /* make sure it will be not marked as dirty */
+ mddev->recovery_cp = MaxSector;
+
+ return setup_conf(mddev);
+}
+
+
static void *raid5_takeover_raid1(mddev_t *mddev)
{
int chunksect;
@@ -5737,12 +5742,13 @@ static int raid6_check_reshape(mddev_t *mddev)
static void *raid5_takeover(mddev_t *mddev)
{
/* raid5 can take over:
- * raid0 - if all devices are the same - make it a raid4 layout
+ * raid0 - if there is only one strip zone - make it a raid4 layout
* raid1 - if there are two drives. We need to know the chunk size
* raid4 - trivial - just use a raid4 layout.
* raid6 - Providing it is a *_6 layout
*/
-
+ if (mddev->level == 0)
+ return raid45_takeover_raid0(mddev, 5);
if (mddev->level == 1)
return raid5_takeover_raid1(mddev);
if (mddev->level == 4) {
@@ -5756,6 +5762,22 @@ static void *raid5_takeover(mddev_t *mddev)
return ERR_PTR(-EINVAL);
}
+static void *raid4_takeover(mddev_t *mddev)
+{
+ /* raid4 can take over:
+ * raid0 - if there is only one strip zone
+ * raid5 - if layout is right
+ */
+ if (mddev->level == 0)
+ return raid45_takeover_raid0(mddev, 4);
+ if (mddev->level == 5 &&
+ mddev->layout == ALGORITHM_PARITY_N) {
+ mddev->new_layout = 0;
+ mddev->new_level = 4;
+ return setup_conf(mddev);
+ }
+ return ERR_PTR(-EINVAL);
+}
static struct mdk_personality raid5_personality;
@@ -5871,6 +5893,7 @@ static struct mdk_personality raid4_personality =
.start_reshape = raid5_start_reshape,
.finish_reshape = raid5_finish_reshape,
.quiesce = raid5_quiesce,
+ .takeover = raid4_takeover,
};
static int __init raid5_init(void)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.