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Merge branch 'for-linus' of git://neil.brown.name/md

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* 'for-linus' of git://neil.brown.name/md: (45 commits)
  md: don't insist on valid event count for spare devices.
  md: simplify updating of event count to sometimes avoid updating spares.
  md/raid6: Fix raid-6 read-error correction in degraded state
  md: restore ability of spare drives to spin down.
  md: Fix read balancing in RAID1 and RAID10 on drives > 2TB
  md/linear: standardise all printk messages
  md/raid0: tidy up printk messages.
  md/raid10: tidy up printk messages.
  md/raid1: improve printk messages
  md/raid5: improve consistency of error messages.
  md: remove EXPERIMENTAL designation from RAID10
  md: allow integers to be passed to md/level
  md: notify mdstat waiters of level change
  md/raid4: permit raid0 takeover
  md/raid1: delay reads that could overtake behind-writes.
  md/raid1: fix confusing 'redirect sector' message.
  md: don't unregister the thread in mddev_suspend
  md: factor out init code for an mddev
  md: pass mddev to make_request functions rather than request_queue
  md: call md_stop_writes from md_stop
  ...
This commit is contained in:
Linus Torvalds 2010-05-21 15:49:14 -07:00
commit 6e4513972a
14 changed files with 987 additions and 582 deletions
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4
drivers/md/Kconfig
View File

@ -100,8 +100,8 @@ config MD_RAID1
If unsure, say Y.
config MD_RAID10
tristate "RAID-10 (mirrored striping) mode (EXPERIMENTAL)"
depends on BLK_DEV_MD && EXPERIMENTAL
tristate "RAID-10 (mirrored striping) mode"
depends on BLK_DEV_MD
---help---
RAID-10 provides a combination of striping (RAID-0) and
mirroring (RAID-1) with easier configuration and more flexible

41
drivers/md/bitmap.c
View File

@ -505,7 +505,7 @@ void bitmap_update_sb(struct bitmap *bitmap)
return;
}
spin_unlock_irqrestore(&bitmap->lock, flags);
sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
sb->events = cpu_to_le64(bitmap->mddev->events);
if (bitmap->mddev->events < bitmap->events_cleared) {
/* rocking back to read-only */
@ -526,7 +526,7 @@ void bitmap_print_sb(struct bitmap *bitmap)
if (!bitmap || !bitmap->sb_page)
return;
sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap));
printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic));
printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version));
@ -575,7 +575,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
return err;
}
sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
chunksize = le32_to_cpu(sb->chunksize);
daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
@ -661,7 +661,7 @@ static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
return 0;
}
spin_unlock_irqrestore(&bitmap->lock, flags);
sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
old = le32_to_cpu(sb->state) & bits;
switch (op) {
case MASK_SET: sb->state |= cpu_to_le32(bits);
@ -1292,9 +1292,14 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
if (!bitmap) return 0;
if (behind) {
int bw;
atomic_inc(&bitmap->behind_writes);
bw = atomic_read(&bitmap->behind_writes);
if (bw > bitmap->behind_writes_used)
bitmap->behind_writes_used = bw;
PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n",
atomic_read(&bitmap->behind_writes), bitmap->max_write_behind);
bw, bitmap->max_write_behind);
}
while (sectors) {
@ -1351,7 +1356,8 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
{
if (!bitmap) return;
if (behind) {
atomic_dec(&bitmap->behind_writes);
if (atomic_dec_and_test(&bitmap->behind_writes))
wake_up(&bitmap->behind_wait);
PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n",
atomic_read(&bitmap->behind_writes), bitmap->max_write_behind);
}
@ -1675,6 +1681,7 @@ int bitmap_create(mddev_t *mddev)
atomic_set(&bitmap->pending_writes, 0);
init_waitqueue_head(&bitmap->write_wait);
init_waitqueue_head(&bitmap->overflow_wait);
init_waitqueue_head(&bitmap->behind_wait);
bitmap->mddev = mddev;
@ -2006,6 +2013,27 @@ static ssize_t can_clear_store(mddev_t *mddev, const char *buf, size_t len)
static struct md_sysfs_entry bitmap_can_clear =
__ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store);
static ssize_t
behind_writes_used_show(mddev_t *mddev, char *page)
{
if (mddev->bitmap == NULL)
return sprintf(page, "0\n");
return sprintf(page, "%lu\n",
mddev->bitmap->behind_writes_used);
}
static ssize_t
behind_writes_used_reset(mddev_t *mddev, const char *buf, size_t len)
{
if (mddev->bitmap)
mddev->bitmap->behind_writes_used = 0;
return len;
}
static struct md_sysfs_entry max_backlog_used =
__ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
behind_writes_used_show, behind_writes_used_reset);
static struct attribute *md_bitmap_attrs[] = {
&bitmap_location.attr,
&bitmap_timeout.attr,
@ -2013,6 +2041,7 @@ static struct attribute *md_bitmap_attrs[] = {
&bitmap_chunksize.attr,
&bitmap_metadata.attr,
&bitmap_can_clear.attr,
&max_backlog_used.attr,
NULL
};
struct attribute_group md_bitmap_group = {

2
drivers/md/bitmap.h
View File

@ -227,6 +227,7 @@ struct bitmap {
int allclean;
atomic_t behind_writes;
unsigned long behind_writes_used; /* highest actual value at runtime */
/*
* the bitmap daemon - periodically wakes up and sweeps the bitmap
@ -239,6 +240,7 @@ struct bitmap {
atomic_t pending_writes; /* pending writes to the bitmap file */
wait_queue_head_t write_wait;
wait_queue_head_t overflow_wait;
wait_queue_head_t behind_wait;
struct sysfs_dirent *sysfs_can_clear;
};

9
drivers/md/faulty.c
View File

@ -169,10 +169,9 @@ static void add_sector(conf_t *conf, sector_t start, int mode)
conf->nfaults = n+1;
}
static int make_request(struct request_queue *q, struct bio *bio)
static int make_request(mddev_t *mddev, struct bio *bio)
{
mddev_t *mddev = q->queuedata;
conf_t *conf = (conf_t*)mddev->private;
conf_t *conf = mddev->private;
int failit = 0;
if (bio_data_dir(bio) == WRITE) {
@ -225,7 +224,7 @@ static int make_request(struct request_queue *q, struct bio *bio)
static void status(struct seq_file *seq, mddev_t *mddev)
{
conf_t *conf = (conf_t*)mddev->private;
conf_t *conf = mddev->private;
int n;
if ((n=atomic_read(&conf->counters[WriteTransient])) != 0)
@ -328,7 +327,7 @@ static int run(mddev_t *mddev)
static int stop(mddev_t *mddev)
{
conf_t *conf = (conf_t *)mddev->private;
conf_t *conf = mddev->private;
kfree(conf);
mddev->private = NULL;

36
drivers/md/linear.c
View File

@ -159,7 +159,8 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
sector_t sectors;
if (j < 0 || j >= raid_disks || disk->rdev) {
printk("linear: disk numbering problem. Aborting!\n");
printk(KERN_ERR "md/linear:%s: disk numbering problem. Aborting!\n",
mdname(mddev));
goto out;
}
@ -187,7 +188,8 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
}
if (cnt != raid_disks) {
printk("linear: not enough drives present. Aborting!\n");
printk(KERN_ERR "md/linear:%s: not enough drives present. Aborting!\n",
mdname(mddev));
goto out;
}
@ -282,29 +284,21 @@ static int linear_stop (mddev_t *mddev)
rcu_barrier();
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
kfree(conf);
mddev->private = NULL;
return 0;
}
static int linear_make_request (struct request_queue *q, struct bio *bio)
static int linear_make_request (mddev_t *mddev, struct bio *bio)
{
const int rw = bio_data_dir(bio);
mddev_t *mddev = q->queuedata;
dev_info_t *tmp_dev;
sector_t start_sector;
int cpu;
if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
md_barrier_request(mddev, bio);
return 0;
}
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();
rcu_read_lock();
tmp_dev = which_dev(mddev, bio->bi_sector);
start_sector = tmp_dev->end_sector - tmp_dev->rdev->sectors;
@ -314,12 +308,14 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
|| (bio->bi_sector < start_sector))) {
char b[BDEVNAME_SIZE];
printk("linear_make_request: Sector %llu out of bounds on "
"dev %s: %llu sectors, offset %llu\n",
(unsigned long long)bio->bi_sector,
bdevname(tmp_dev->rdev->bdev, b),
(unsigned long long)tmp_dev->rdev->sectors,
(unsigned long long)start_sector);
printk(KERN_ERR
"md/linear:%s: make_request: Sector %llu out of bounds on "
"dev %s: %llu sectors, offset %llu\n",
mdname(mddev),
(unsigned long long)bio->bi_sector,
bdevname(tmp_dev->rdev->bdev, b),
(unsigned long long)tmp_dev->rdev->sectors,
(unsigned long long)start_sector);
rcu_read_unlock();
bio_io_error(bio);
return 0;
@ -336,9 +332,9 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
bp = bio_split(bio, end_sector - bio->bi_sector);
if (linear_make_request(q, &bp->bio1))
if (linear_make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
if (linear_make_request(q, &bp->bio2))
if (linear_make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
bio_pair_release(bp);
return 0;

537
drivers/md/md.c
View File

@ -215,8 +215,11 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
*/
static int md_make_request(struct request_queue *q, struct bio *bio)
{
const int rw = bio_data_dir(bio);
mddev_t *mddev = q->queuedata;
int rv;
int cpu;
if (mddev == NULL || mddev->pers == NULL) {
bio_io_error(bio);
return 0;
@ -237,13 +240,27 @@ static int md_make_request(struct request_queue *q, struct bio *bio)
}
atomic_inc(&mddev->active_io);
rcu_read_unlock();
rv = mddev->pers->make_request(q, bio);
rv = mddev->pers->make_request(mddev, bio);
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();
if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
wake_up(&mddev->sb_wait);
return rv;
}
/* mddev_suspend makes sure no new requests are submitted
* to the device, and that any requests that have been submitted
* are completely handled.
* Once ->stop is called and completes, the module will be completely
* unused.
*/
static void mddev_suspend(mddev_t *mddev)
{
BUG_ON(mddev->suspended);
@ -251,13 +268,6 @@ static void mddev_suspend(mddev_t *mddev)
synchronize_rcu();
wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
mddev->pers->quiesce(mddev, 1);
md_unregister_thread(mddev->thread);
mddev->thread = NULL;
/* we now know that no code is executing in the personality module,
* except possibly the tail end of a ->bi_end_io function, but that
* is certain to complete before the module has a chance to get
* unloaded
*/
}
static void mddev_resume(mddev_t *mddev)
@ -344,7 +354,7 @@ static void md_submit_barrier(struct work_struct *ws)
bio_endio(bio, 0);
else {
bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
if (mddev->pers->make_request(mddev->queue, bio))
if (mddev->pers->make_request(mddev, bio))
generic_make_request(bio);
mddev->barrier = POST_REQUEST_BARRIER;
submit_barriers(mddev);
@ -406,6 +416,27 @@ static void mddev_put(mddev_t *mddev)
spin_unlock(&all_mddevs_lock);
}
static void mddev_init(mddev_t *mddev)
{
mutex_init(&mddev->open_mutex);
mutex_init(&mddev->reconfig_mutex);
mutex_init(&mddev->bitmap_info.mutex);
INIT_LIST_HEAD(&mddev->disks);
INIT_LIST_HEAD(&mddev->all_mddevs);
init_timer(&mddev->safemode_timer);
atomic_set(&mddev->active, 1);
atomic_set(&mddev->openers, 0);
atomic_set(&mddev->active_io, 0);
spin_lock_init(&mddev->write_lock);
atomic_set(&mddev->flush_pending, 0);
init_waitqueue_head(&mddev->sb_wait);
init_waitqueue_head(&mddev->recovery_wait);
mddev->reshape_position = MaxSector;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->level = LEVEL_NONE;
}
static mddev_t * mddev_find(dev_t unit)
{
mddev_t *mddev, *new = NULL;
@ -472,23 +503,7 @@ static mddev_t * mddev_find(dev_t unit)
else
new->md_minor = MINOR(unit) >> MdpMinorShift;
mutex_init(&new->open_mutex);
mutex_init(&new->reconfig_mutex);
mutex_init(&new->bitmap_info.mutex);
INIT_LIST_HEAD(&new->disks);
INIT_LIST_HEAD(&new->all_mddevs);
init_timer(&new->safemode_timer);
atomic_set(&new->active, 1);
atomic_set(&new->openers, 0);
atomic_set(&new->active_io, 0);
spin_lock_init(&new->write_lock);
atomic_set(&new->flush_pending, 0);
init_waitqueue_head(&new->sb_wait);
init_waitqueue_head(&new->recovery_wait);
new->reshape_position = MaxSector;
new->resync_min = 0;
new->resync_max = MaxSector;
new->level = LEVEL_NONE;
mddev_init(new);
goto retry;
}
@ -508,9 +523,36 @@ static inline int mddev_trylock(mddev_t * mddev)
return mutex_trylock(&mddev->reconfig_mutex);
}
static inline void mddev_unlock(mddev_t * mddev)
static struct attribute_group md_redundancy_group;
static void mddev_unlock(mddev_t * mddev)
{
mutex_unlock(&mddev->reconfig_mutex);
if (mddev->to_remove) {
/* These cannot be removed under reconfig_mutex as
* an access to the files will try to take reconfig_mutex
* while holding the file unremovable, which leads to
* a deadlock.
* So hold open_mutex instead - we are allowed to take
* it while holding reconfig_mutex, and md_run can
* use it to wait for the remove to complete.
*/
struct attribute_group *to_remove = mddev->to_remove;
mddev->to_remove = NULL;
mutex_lock(&mddev->open_mutex);
mutex_unlock(&mddev->reconfig_mutex);
if (to_remove != &md_redundancy_group)
sysfs_remove_group(&mddev->kobj, to_remove);
if (mddev->pers == NULL ||
mddev->pers->sync_request == NULL) {
sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
if (mddev->sysfs_action)
sysfs_put(mddev->sysfs_action);
mddev->sysfs_action = NULL;
}
mutex_unlock(&mddev->open_mutex);
} else
mutex_unlock(&mddev->reconfig_mutex);
md_wakeup_thread(mddev->thread);
}
@ -1029,10 +1071,13 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->bitmap_info.default_offset;
} else if (mddev->pers == NULL) {
/* Insist on good event counter while assembling */
/* Insist on good event counter while assembling, except
* for spares (which don't need an event count) */
++ev1;
if (ev1 < mddev->events)
return -EINVAL;
if (sb->disks[rdev->desc_nr].state & (
(1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
/* if adding to array with a bitmap, then we can accept an
* older device ... but not too old.
@ -1428,10 +1473,14 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
}
} else if (mddev->pers == NULL) {
/* Insist of good event counter while assembling */
/* Insist of good event counter while assembling, except for
* spares (which don't need an event count) */
++ev1;
if (ev1 < mddev->events)
return -EINVAL;
if (rdev->desc_nr >= 0 &&
rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
/* If adding to array with a bitmap, then we can accept an
* older device, but not too old.
@ -2047,7 +2096,6 @@ static void sync_sbs(mddev_t * mddev, int nospares)
if (rdev->sb_events == mddev->events ||
(nospares &&
rdev->raid_disk < 0 &&
(rdev->sb_events&1)==0 &&
rdev->sb_events+1 == mddev->events)) {
/* Don't update this superblock */
rdev->sb_loaded = 2;
@ -2100,28 +2148,14 @@ repeat:
* and 'events' is odd, we can roll back to the previous clean state */
if (nospares
&& (mddev->in_sync && mddev->recovery_cp == MaxSector)
&& (mddev->events & 1)
&& mddev->events != 1)
&& mddev->can_decrease_events
&& mddev->events != 1) {
mddev->events--;
else {
mddev->can_decrease_events = 0;
} else {
/* otherwise we have to go forward and ... */
mddev->events ++;
if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
/* .. if the array isn't clean, an 'even' event must also go
* to spares. */
if ((mddev->events&1)==0) {
nospares = 0;
sync_req = 2; /* force a second update to get the
* even/odd in sync */
}
} else {
/* otherwise an 'odd' event must go to spares */
if ((mddev->events&1)) {
nospares = 0;
sync_req = 2; /* force a second update to get the
* even/odd in sync */
}
}
mddev->can_decrease_events = nospares;
}
if (!mddev->events) {
@ -2365,6 +2399,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
return err;
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&rdev->mddev->kobj, nm);
rdev->raid_disk = -1;
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
} else if (rdev->mddev->pers) {
@ -2780,8 +2815,9 @@ static void analyze_sbs(mddev_t * mddev)
i = 0;
rdev_for_each(rdev, tmp, mddev) {
if (rdev->desc_nr >= mddev->max_disks ||
i > mddev->max_disks) {
if (mddev->max_disks &&
(rdev->desc_nr >= mddev->max_disks ||
i > mddev->max_disks)) {
printk(KERN_WARNING
"md: %s: %s: only %d devices permitted\n",
mdname(mddev), bdevname(rdev->bdev, b),
@ -2897,9 +2933,10 @@ level_show(mddev_t *mddev, char *page)
static ssize_t
level_store(mddev_t *mddev, const char *buf, size_t len)
{
char level[16];
char clevel[16];
ssize_t rv = len;
struct mdk_personality *pers;
long level;
void *priv;
mdk_rdev_t *rdev;
@ -2932,19 +2969,22 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
}
/* Now find the new personality */
if (len == 0 || len >= sizeof(level))
if (len == 0 || len >= sizeof(clevel))
return -EINVAL;
strncpy(level, buf, len);
if (level[len-1] == '\n')
strncpy(clevel, buf, len);
if (clevel[len-1] == '\n')
len--;
level[len] = 0;
clevel[len] = 0;
if (strict_strtol(clevel, 10, &level))
level = LEVEL_NONE;
request_module("md-%s", level);
if (request_module("md-%s", clevel) != 0)
request_module("md-level-%s", clevel);
spin_lock(&pers_lock);
pers = find_pers(LEVEL_NONE, level);
pers = find_pers(level, clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
printk(KERN_WARNING "md: personality %s not loaded\n", level);
printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
return -EINVAL;
}
spin_unlock(&pers_lock);
@ -2957,7 +2997,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
if (!pers->takeover) {
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
mdname(mddev), level);
mdname(mddev), clevel);
return -EINVAL;
}
@ -2973,13 +3013,44 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
mddev->delta_disks = 0;
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s would not accept array\n",
mdname(mddev), level);
mdname(mddev), clevel);
return PTR_ERR(priv);
}
/* Looks like we have a winner */
mddev_suspend(mddev);
mddev->pers->stop(mddev);
if (mddev->pers->sync_request == NULL &&
pers->sync_request != NULL) {
/* need to add the md_redundancy_group */
if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
printk(KERN_WARNING
"md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
}
if (mddev->pers->sync_request != NULL &&
pers->sync_request == NULL) {
/* need to remove the md_redundancy_group */
if (mddev->to_remove == NULL)
mddev->to_remove = &md_redundancy_group;
}
if (mddev->pers->sync_request == NULL &&
mddev->external) {
/* We are converting from a no-redundancy array
* to a redundancy array and metadata is managed
* externally so we need to be sure that writes
* won't block due to a need to transition
* clean->dirty
* until external management is started.
*/
mddev->in_sync = 0;
mddev->safemode_delay = 0;
mddev->safemode = 0;
}
module_put(mddev->pers->owner);
/* Invalidate devices that are now superfluous */
list_for_each_entry(rdev, &mddev->disks, same_set)
@ -2994,11 +3065,20 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
mddev->layout = mddev->new_layout;
mddev->chunk_sectors = mddev->new_chunk_sectors;
mddev->delta_disks = 0;
if (mddev->pers->sync_request == NULL) {
/* this is now an array without redundancy, so
* it must always be in_sync
*/
mddev->in_sync = 1;
del_timer_sync(&mddev->safemode_timer);
}
pers->run(mddev);
mddev_resume(mddev);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
sysfs_notify(&mddev->kobj, NULL, "level");
md_new_event(mddev);
return rv;
}
@ -3237,6 +3317,7 @@ array_state_show(mddev_t *mddev, char *page)
}
static int do_md_stop(mddev_t * mddev, int ro, int is_open);
static int md_set_readonly(mddev_t * mddev, int is_open);
static int do_md_run(mddev_t * mddev);
static int restart_array(mddev_t *mddev);
@ -3267,7 +3348,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
break; /* not supported yet */
case readonly:
if (mddev->pers)
err = do_md_stop(mddev, 1, 0);
err = md_set_readonly(mddev, 0);
else {
mddev->ro = 1;
set_disk_ro(mddev->gendisk, 1);
@ -3277,7 +3358,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
case read_auto:
if (mddev->pers) {
if (mddev->ro == 0)
err = do_md_stop(mddev, 1, 0);
err = md_set_readonly(mddev, 0);
else if (mddev->ro == 1)
err = restart_array(mddev);
if (err == 0) {
@ -4082,15 +4163,6 @@ static void mddev_delayed_delete(struct work_struct *ws)
{
mddev_t *mddev = container_of(ws, mddev_t, del_work);
if (mddev->private) {
sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
if (mddev->private != (void*)1)
sysfs_remove_group(&mddev->kobj, mddev->private);
if (mddev->sysfs_action)
sysfs_put(mddev->sysfs_action);
mddev->sysfs_action = NULL;
mddev->private = NULL;
}
sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
kobject_del(&mddev->kobj);
kobject_put(&mddev->kobj);
@ -4234,11 +4306,10 @@ static void md_safemode_timeout(unsigned long data)
static int start_dirty_degraded;
static int do_md_run(mddev_t * mddev)
static int md_run(mddev_t *mddev)
{
int err;
mdk_rdev_t *rdev;
struct gendisk *disk;
struct mdk_personality *pers;
if (list_empty(&mddev->disks))
@ -4248,6 +4319,13 @@ static int do_md_run(mddev_t * mddev)
if (mddev->pers)
return -EBUSY;
/* These two calls synchronise us with the
* sysfs_remove_group calls in mddev_unlock,
* so they must have completed.
*/
mutex_lock(&mddev->open_mutex);
mutex_unlock(&mddev->open_mutex);
/*
* Analyze all RAID superblock(s)
*/
@ -4296,8 +4374,6 @@ static int do_md_run(mddev_t * mddev)
sysfs_notify_dirent(rdev->sysfs_state);
}
disk = mddev->gendisk;
spin_lock(&pers_lock);
pers = find_pers(mddev->level, mddev->clevel);
if (!pers || !try_module_get(pers->owner)) {
@ -4425,22 +4501,32 @@ static int do_md_run(mddev_t * mddev)
if (mddev->flags)
md_update_sb(mddev, 0);
set_capacity(disk, mddev->array_sectors);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
revalidate_disk(mddev->gendisk);
mddev->changed = 1;
md_new_event(mddev);
sysfs_notify_dirent(mddev->sysfs_state);
if (mddev->sysfs_action)
sysfs_notify_dirent(mddev->sysfs_action);
sysfs_notify(&mddev->kobj, NULL, "degraded");
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
return 0;
}
static int do_md_run(mddev_t *mddev)
{
int err;
err = md_run(mddev);
if (err)
goto out;
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
out:
return err;
}
static int restart_array(mddev_t *mddev)
{
struct gendisk *disk = mddev->gendisk;
@ -4491,9 +4577,110 @@ void restore_bitmap_write_access(struct file *file)
spin_unlock(&inode->i_lock);
}
static void md_clean(mddev_t *mddev)
{
mddev->array_sectors = 0;
mddev->external_size = 0;
mddev->dev_sectors = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->reshape_position = MaxSector;
mddev->external = 0;
mddev->persistent = 0;
mddev->level = LEVEL_NONE;
mddev->clevel[0] = 0;
mddev->flags = 0;
mddev->ro = 0;
mddev->metadata_type[0] = 0;
mddev->chunk_sectors = 0;
mddev->ctime = mddev->utime = 0;
mddev->layout = 0;
mddev->max_disks = 0;
mddev->events = 0;
mddev->can_decrease_events = 0;
mddev->delta_disks = 0;
mddev->new_level = LEVEL_NONE;
mddev->new_layout = 0;
mddev->new_chunk_sectors = 0;
mddev->curr_resync = 0;
mddev->resync_mismatches = 0;
mddev->suspend_lo = mddev->suspend_hi = 0;
mddev->sync_speed_min = mddev->sync_speed_max = 0;
mddev->recovery = 0;
mddev->in_sync = 0;
mddev->degraded = 0;
mddev->barriers_work = 0;
mddev->safemode = 0;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.default_offset = 0;
mddev->bitmap_info.chunksize = 0;
mddev->bitmap_info.daemon_sleep = 0;
mddev->bitmap_info.max_write_behind = 0;
}
static void md_stop_writes(mddev_t *mddev)
{
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(mddev->sync_thread);
mddev->sync_thread = NULL;
}
del_timer_sync(&mddev->safemode_timer);
bitmap_flush(mddev);
md_super_wait(mddev);
if (!mddev->in_sync || mddev->flags) {
/* mark array as shutdown cleanly */
mddev->in_sync = 1;
md_update_sb(mddev, 1);
}
}
static void md_stop(mddev_t *mddev)
{
md_stop_writes(mddev);
mddev->pers->stop(mddev);
if (mddev->pers->sync_request && mddev->to_remove == NULL)
mddev->to_remove = &md_redundancy_group;
module_put(mddev->pers->owner);
mddev->pers = NULL;
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
}
static int md_set_readonly(mddev_t *mddev, int is_open)
{
int err = 0;
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > is_open) {
printk("md: %s still in use.\n",mdname(mddev));
err = -EBUSY;
goto out;
}
if (mddev->pers) {
md_stop_writes(mddev);
err = -ENXIO;
if (mddev->ro==1)
goto out;
mddev->ro = 1;
set_disk_ro(mddev->gendisk, 1);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
sysfs_notify_dirent(mddev->sysfs_state);
err = 0;
}
out:
mutex_unlock(&mddev->open_mutex);
return err;
}
/* mode:
* 0 - completely stop and dis-assemble array
* 1 - switch to readonly
* 2 - stop but do not disassemble array
*/
static int do_md_stop(mddev_t * mddev, int mode, int is_open)
@ -4508,64 +4695,32 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
err = -EBUSY;
} else if (mddev->pers) {
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(mddev->sync_thread);
mddev->sync_thread = NULL;
}
if (mddev->ro)
set_disk_ro(disk, 0);
del_timer_sync(&mddev->safemode_timer);
md_stop(mddev);
mddev->queue->merge_bvec_fn = NULL;
mddev->queue->unplug_fn = NULL;
mddev->queue->backing_dev_info.congested_fn = NULL;
switch(mode) {
case 1: /* readonly */
err = -ENXIO;
if (mddev->ro==1)
goto out;
mddev->ro = 1;
break;
case 0: /* disassemble */
case 2: /* stop */
bitmap_flush(mddev);
md_super_wait(mddev);
if (mddev->ro)
set_disk_ro(disk, 0);
/* tell userspace to handle 'inactive' */
sysfs_notify_dirent(mddev->sysfs_state);
mddev->pers->stop(mddev);
mddev->queue->merge_bvec_fn = NULL;
mddev->queue->unplug_fn = NULL;
mddev->queue->backing_dev_info.congested_fn = NULL;
module_put(mddev->pers->owner);
if (mddev->pers->sync_request && mddev->private == NULL)
mddev->private = (void*)1;
mddev->pers = NULL;
/* tell userspace to handle 'inactive' */
sysfs_notify_dirent(mddev->sysfs_state);
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}
set_capacity(disk, 0);
revalidate_disk(disk);
set_capacity(disk, 0);
mddev->changed = 1;
if (mddev->ro)
mddev->ro = 0;
}
if (!mddev->in_sync || mddev->flags) {
/* mark array as shutdown cleanly */
mddev->in_sync = 1;
md_update_sb(mddev, 1);
}
if (mode == 1)
set_disk_ro(disk, 1);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
if (mddev->ro)
mddev->ro = 0;
err = 0;
}
out:
mutex_unlock(&mddev->open_mutex);
if (err)
return err;
@ -4586,52 +4741,12 @@ out:
export_array(mddev);
mddev->array_sectors = 0;
mddev->external_size = 0;
mddev->dev_sectors = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->reshape_position = MaxSector;
mddev->external = 0;
mddev->persistent = 0;
mddev->level = LEVEL_NONE;
mddev->clevel[0] = 0;
mddev->flags = 0;
mddev->ro = 0;
mddev->metadata_type[0] = 0;
mddev->chunk_sectors = 0;
mddev->ctime = mddev->utime = 0;
mddev->layout = 0;
mddev->max_disks = 0;
mddev->events = 0;
mddev->delta_disks = 0;
mddev->new_level = LEVEL_NONE;
mddev->new_layout = 0;
mddev->new_chunk_sectors = 0;
mddev->curr_resync = 0;
mddev->resync_mismatches = 0;
mddev->suspend_lo = mddev->suspend_hi = 0;
mddev->sync_speed_min = mddev->sync_speed_max = 0;
mddev->recovery = 0;
mddev->in_sync = 0;
mddev->changed = 0;
mddev->degraded = 0;
mddev->barriers_work = 0;
mddev->safemode = 0;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.default_offset = 0;
mddev->bitmap_info.chunksize = 0;
mddev->bitmap_info.daemon_sleep = 0;
mddev->bitmap_info.max_write_behind = 0;
md_clean(mddev);
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
if (mddev->hold_active == UNTIL_STOP)
mddev->hold_active = 0;
} else if (mddev->pers)
printk(KERN_INFO "md: %s switched to read-only mode.\n",
mdname(mddev));
}
err = 0;
blk_integrity_unregister(disk);
md_new_event(mddev);
@ -5349,7 +5464,7 @@ static int update_raid_disks(mddev_t *mddev, int raid_disks)
if (mddev->pers->check_reshape == NULL)
return -EINVAL;
if (raid_disks <= 0 ||
raid_disks >= mddev->max_disks)
(mddev->max_disks && raid_disks >= mddev->max_disks))
return -EINVAL;
if (mddev->sync_thread || mddev->reshape_position != MaxSector)
return -EBUSY;
@ -5486,7 +5601,7 @@ static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
geo->heads = 2;
geo->sectors = 4;
geo->cylinders = get_capacity(mddev->gendisk) / 8;
geo->cylinders = mddev->array_sectors / 8;
return 0;
}
@ -5496,6 +5611,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
int err = 0;
void __user *argp = (void __user *)arg;
mddev_t *mddev = NULL;
int ro;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
@ -5628,9 +5744,37 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
goto done_unlock;
case STOP_ARRAY_RO:
err = do_md_stop(mddev, 1, 1);
err = md_set_readonly(mddev, 1);
goto done_unlock;
case BLKROSET:
if (get_user(ro, (int __user *)(arg))) {
err = -EFAULT;
goto done_unlock;
}
err = -EINVAL;
/* if the bdev is going readonly the value of mddev->ro
* does not matter, no writes are coming
*/
if (ro)
goto done_unlock;
/* are we are already prepared for writes? */
if (mddev->ro != 1)
goto done_unlock;
/* transitioning to readauto need only happen for
* arrays that call md_write_start
*/
if (mddev->pers) {
err = restart_array(mddev);
if (err == 0) {
mddev->ro = 2;
set_disk_ro(mddev->gendisk, 0);
}
}
goto done_unlock;
}
/*
@ -5751,7 +5895,6 @@ static int md_open(struct block_device *bdev, fmode_t mode)
atomic_inc(&mddev->openers);
mutex_unlock(&mddev->open_mutex);
check_disk_change(bdev);
out:
return err;
}
@ -5766,21 +5909,6 @@ static int md_release(struct gendisk *disk, fmode_t mode)
return 0;
}
static int md_media_changed(struct gendisk *disk)
{
mddev_t *mddev = disk->private_data;
return mddev->changed;
}
static int md_revalidate(struct gendisk *disk)
{
mddev_t *mddev = disk->private_data;
mddev->changed = 0;
return 0;
}
static const struct block_device_operations md_fops =
{
.owner = THIS_MODULE,
@ -5791,8 +5919,6 @@ static const struct block_device_operations md_fops =
.compat_ioctl = md_compat_ioctl,
#endif
.getgeo = md_getgeo,
.media_changed = md_media_changed,
.revalidate_disk= md_revalidate,
};
static int md_thread(void * arg)
@ -5906,7 +6032,7 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->pers->error_handler(mddev,rdev);
if (mddev->degraded)
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
set_bit(StateChanged, &rdev->flags);
sysfs_notify_dirent(rdev->sysfs_state);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
@ -6898,11 +7024,6 @@ void md_check_recovery(mddev_t *mddev)
if (mddev->flags)
md_update_sb(mddev, 0);
list_for_each_entry(rdev, &mddev->disks, same_set)
if (test_and_clear_bit(StateChanged, &rdev->flags))
sysfs_notify_dirent(rdev->sysfs_state);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
/* resync/recovery still happening */
@ -7039,7 +7160,7 @@ static int md_notify_reboot(struct notifier_block *this,
* appears to still be in use. Hence
* the '100'.
*/
do_md_stop(mddev, 1, 100);
md_set_readonly(mddev, 100);
mddev_unlock(mddev);
}
/*

16
drivers/md/md.h
View File

@ -74,9 +74,6 @@ struct mdk_rdev_s
#define Blocked 8 /* An error occured on an externally
* managed array, don't allow writes
* until it is cleared */
#define StateChanged 9 /* Faulty or Blocked has changed during
* interrupt, so it needs to be
* notified by the thread */
wait_queue_head_t blocked_wait;
int desc_nr; /* descriptor index in the superblock */
@ -153,6 +150,12 @@ struct mddev_s
int external_size; /* size managed
* externally */
__u64 events;
/* If the last 'event' was simply a clean->dirty transition, and
* we didn't write it to the spares, then it is safe and simple
* to just decrement the event count on a dirty->clean transition.
* So we record that possibility here.
*/
int can_decrease_events;
char uuid[16];
@ -240,7 +243,6 @@ struct mddev_s
atomic_t active; /* general refcount */
atomic_t openers; /* number of active opens */
int changed; /* true if we might need to reread partition info */
int degraded; /* whether md should consider
* adding a spare
*/
@ -279,9 +281,6 @@ struct mddev_s
atomic_t writes_pending;
struct request_queue *queue; /* for plugging ... */
atomic_t write_behind; /* outstanding async IO */
unsigned int max_write_behind; /* 0 = sync */
struct bitmap *bitmap; /* the bitmap for the device */
struct {
struct file *file; /* the bitmap file */
@ -305,6 +304,7 @@ struct mddev_s
atomic_t max_corr_read_errors; /* max read retries */
struct list_head all_mddevs;
struct attribute_group *to_remove;
/* Generic barrier handling.
* If there is a pending barrier request, all other
* writes are blocked while the devices are flushed.
@ -336,7 +336,7 @@ struct mdk_personality
int level;
struct list_head list;
struct module *owner;
int (*make_request)(struct request_queue *q, struct bio *bio);
int (*make_request)(mddev_t *mddev, struct bio *bio);
int (*run)(mddev_t *mddev);
int (*stop)(mddev_t *mddev);
void (*status)(struct seq_file *seq, mddev_t *mddev);

13
drivers/md/multipath.c
View File

@ -85,7 +85,7 @@ static void multipath_end_bh_io (struct multipath_bh *mp_bh, int err)
static void multipath_end_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct multipath_bh * mp_bh = (struct multipath_bh *)(bio->bi_private);
struct multipath_bh *mp_bh = bio->bi_private;
multipath_conf_t *conf = mp_bh->mddev->private;
mdk_rdev_t *rdev = conf->multipaths[mp_bh->path].rdev;
@ -136,14 +136,11 @@ static void multipath_unplug(struct request_queue *q)
}
static int multipath_make_request (struct request_queue *q, struct bio * bio)
static int multipath_make_request(mddev_t *mddev, struct bio * bio)
{
mddev_t *mddev = q->queuedata;
multipath_conf_t *conf = mddev->private;
struct multipath_bh * mp_bh;
struct multipath_info *multipath;
const int rw = bio_data_dir(bio);
int cpu;
if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
md_barrier_request(mddev, bio);
@ -155,12 +152,6 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
mp_bh->master_bio = bio;
mp_bh->mddev = mddev;
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();
mp_bh->path = multipath_map(conf);
if (mp_bh->path < 0) {
bio_endio(bio, -EIO);

251
drivers/md/raid0.c
View File

@ -23,15 +23,17 @@
#include <linux/slab.h>
#include "md.h"
#include "raid0.h"
#include "raid5.h"
static void raid0_unplug(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
raid0_conf_t *conf = mddev->private;
mdk_rdev_t **devlist = conf->devlist;
int raid_disks = conf->strip_zone[0].nb_dev;
int i;
for (i=0; i<mddev->raid_disks; i++) {
for (i=0; i < raid_disks; i++) {
struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev);
blk_unplug(r_queue);
@ -43,12 +45,13 @@ static int raid0_congested(void *data, int bits)
mddev_t *mddev = data;
raid0_conf_t *conf = mddev->private;
mdk_rdev_t **devlist = conf->devlist;
int raid_disks = conf->strip_zone[0].nb_dev;
int i, ret = 0;
if (mddev_congested(mddev, bits))
return 1;
for (i = 0; i < mddev->raid_disks && !ret ; i++) {
for (i = 0; i < raid_disks && !ret ; i++) {
struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
ret |= bdi_congested(&q->backing_dev_info, bits);
@ -66,16 +69,17 @@ static void dump_zones(mddev_t *mddev)
sector_t zone_start = 0;
char b[BDEVNAME_SIZE];
raid0_conf_t *conf = mddev->private;
int raid_disks = conf->strip_zone[0].nb_dev;
printk(KERN_INFO "******* %s configuration *********\n",
mdname(mddev));
h = 0;
for (j = 0; j < conf->nr_strip_zones; j++) {
printk(KERN_INFO "zone%d=[", j);
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
printk("%s/",
bdevname(conf->devlist[j*mddev->raid_disks
printk(KERN_CONT "%s/",
bdevname(conf->devlist[j*raid_disks
+ k]->bdev, b));
printk("]\n");
printk(KERN_CONT "]\n");
zone_size = conf->strip_zone[j].zone_end - zone_start;
printk(KERN_INFO " zone offset=%llukb "
@ -88,7 +92,7 @@ static void dump_zones(mddev_t *mddev)
printk(KERN_INFO "**********************************\n\n");
}
static int create_strip_zones(mddev_t *mddev)
static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf)
{
int i, c, err;
sector_t curr_zone_end, sectors;
@ -101,8 +105,9 @@ static int create_strip_zones(mddev_t *mddev)
if (!conf)
return -ENOMEM;
list_for_each_entry(rdev1, &mddev->disks, same_set) {
printk(KERN_INFO "raid0: looking at %s\n",
bdevname(rdev1->bdev,b));
printk(KERN_INFO "md/raid0:%s: looking at %s\n",
mdname(mddev),
bdevname(rdev1->bdev, b));
c = 0;
/* round size to chunk_size */
@ -111,14 +116,16 @@ static int create_strip_zones(mddev_t *mddev)
rdev1->sectors = sectors * mddev->chunk_sectors;
list_for_each_entry(rdev2, &mddev->disks, same_set) {
printk(KERN_INFO "raid0: comparing %s(%llu)",
printk(KERN_INFO "md/raid0:%s: comparing %s(%llu)",
mdname(mddev),
bdevname(rdev1->bdev,b),
(unsigned long long)rdev1->sectors);
printk(KERN_INFO " with %s(%llu)\n",
printk(KERN_CONT " with %s(%llu)\n",
bdevname(rdev2->bdev,b),
(unsigned long long)rdev2->sectors);
if (rdev2 == rdev1) {
printk(KERN_INFO "raid0: END\n");
printk(KERN_INFO "md/raid0:%s: END\n",
mdname(mddev));
break;
}
if (rdev2->sectors == rdev1->sectors) {
@ -126,20 +133,24 @@ static int create_strip_zones(mddev_t *mddev)
* Not unique, don't count it as a new
* group
*/
printk(KERN_INFO "raid0: EQUAL\n");
printk(KERN_INFO "md/raid0:%s: EQUAL\n",
mdname(mddev));
c = 1;
break;
}
printk(KERN_INFO "raid0: NOT EQUAL\n");
printk(KERN_INFO "md/raid0:%s: NOT EQUAL\n",
mdname(mddev));
}
if (!c) {
printk(KERN_INFO "raid0: ==> UNIQUE\n");
printk(KERN_INFO "md/raid0:%s: ==> UNIQUE\n",
mdname(mddev));
conf->nr_strip_zones++;
printk(KERN_INFO "raid0: %d zones\n",
conf->nr_strip_zones);
printk(KERN_INFO "md/raid0:%s: %d zones\n",
mdname(mddev), conf->nr_strip_zones);
}
}
printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones);
printk(KERN_INFO "md/raid0:%s: FINAL %d zones\n",
mdname(mddev), conf->nr_strip_zones);
err = -ENOMEM;
conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
conf->nr_strip_zones, GFP_KERNEL);
@ -162,14 +173,18 @@ static int create_strip_zones(mddev_t *mddev)
list_for_each_entry(rdev1, &mddev->disks, same_set) {
int j = rdev1->raid_disk;
if (mddev->level == 10)
/* taking over a raid10-n2 array */
j /= 2;
if (j < 0 || j >= mddev->raid_disks) {
printk(KERN_ERR "raid0: bad disk number %d - "
"aborting!\n", j);
printk(KERN_ERR "md/raid0:%s: bad disk number %d - "
"aborting!\n", mdname(mddev), j);
goto abort;
}
if (dev[j]) {
printk(KERN_ERR "raid0: multiple devices for %d - "
"aborting!\n", j);
printk(KERN_ERR "md/raid0:%s: multiple devices for %d - "
"aborting!\n", mdname(mddev), j);
goto abort;
}
dev[j] = rdev1;
@ -191,8 +206,8 @@ static int create_strip_zones(mddev_t *mddev)
cnt++;
}
if (cnt != mddev->raid_disks) {
printk(KERN_ERR "raid0: too few disks (%d of %d) - "
"aborting!\n", cnt, mddev->raid_disks);
printk(KERN_ERR "md/raid0:%s: too few disks (%d of %d) - "
"aborting!\n", mdname(mddev), cnt, mddev->raid_disks);
goto abort;
}
zone->nb_dev = cnt;
@ -208,39 +223,44 @@ static int create_strip_zones(mddev_t *mddev)
zone = conf->strip_zone + i;
dev = conf->devlist + i * mddev->raid_disks;
printk(KERN_INFO "raid0: zone %d\n", i);
printk(KERN_INFO "md/raid0:%s: zone %d\n",
mdname(mddev), i);
zone->dev_start = smallest->sectors;
smallest = NULL;
c = 0;
for (j=0; j<cnt; j++) {
rdev = conf->devlist[j];
printk(KERN_INFO "raid0: checking %s ...",
bdevname(rdev->bdev, b));
printk(KERN_INFO "md/raid0:%s: checking %s ...",
mdname(mddev),
bdevname(rdev->bdev, b));
if (rdev->sectors <= zone->dev_start) {
printk(KERN_INFO " nope.\n");
printk(KERN_CONT " nope.\n");
continue;
}
printk(KERN_INFO " contained as device %d\n", c);
printk(KERN_CONT " contained as device %d\n", c);
dev[c] = rdev;
c++;
if (!smallest || rdev->sectors < smallest->sectors) {
smallest = rdev;
printk(KERN_INFO " (%llu) is smallest!.\n",
(unsigned long long)rdev->sectors);
printk(KERN_INFO "md/raid0:%s: (%llu) is smallest!.\n",
mdname(mddev),
(unsigned long long)rdev->sectors);
}
}
zone->nb_dev = c;
sectors = (smallest->sectors - zone->dev_start) * c;
printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n",
zone->nb_dev, (unsigned long long)sectors);
printk(KERN_INFO "md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n",
mdname(mddev),
zone->nb_dev, (unsigned long long)sectors);
curr_zone_end += sectors;
zone->zone_end = curr_zone_end;
printk(KERN_INFO "raid0: current zone start: %llu\n",
(unsigned long long)smallest->sectors);
printk(KERN_INFO "md/raid0:%s: current zone start: %llu\n",
mdname(mddev),
(unsigned long long)smallest->sectors);
}
mddev->queue->unplug_fn = raid0_unplug;
mddev->queue->backing_dev_info.congested_fn = raid0_congested;
@ -251,7 +271,7 @@ static int create_strip_zones(mddev_t *mddev)
* chunk size is a multiple of that sector size
*/
if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) {
printk(KERN_ERR "%s chunk_size of %d not valid\n",
printk(KERN_ERR "md/raid0:%s: chunk_size of %d not valid\n",
mdname(mddev),
mddev->chunk_sectors << 9);
goto abort;
@ -261,14 +281,15 @@ static int create_strip_zones(mddev_t *mddev)
blk_queue_io_opt(mddev->queue,
(mddev->chunk_sectors << 9) * mddev->raid_disks);
printk(KERN_INFO "raid0: done.\n");
mddev->private = conf;
printk(KERN_INFO "md/raid0:%s: done.\n", mdname(mddev));
*private_conf = conf;
return 0;
abort:
kfree(conf->strip_zone);
kfree(conf->devlist);
kfree(conf);
mddev->private = NULL;
*private_conf = NULL;
return err;
}
@ -319,10 +340,12 @@ static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
static int raid0_run(mddev_t *mddev)
{
raid0_conf_t *conf;
int ret;
if (mddev->chunk_sectors == 0) {
printk(KERN_ERR "md/raid0: chunk size must be set.\n");
printk(KERN_ERR "md/raid0:%s: chunk size must be set.\n",
mdname(mddev));
return -EINVAL;
}
if (md_check_no_bitmap(mddev))
@ -330,15 +353,27 @@ static int raid0_run(mddev_t *mddev)
blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
ret = create_strip_zones(mddev);
if (ret < 0)
return ret;
/* if private is not null, we are here after takeover */
if (mddev->private == NULL) {
ret = create_strip_zones(mddev, &conf);
if (ret < 0)
return ret;
mddev->private = conf;
}
conf = mddev->private;
if (conf->scale_raid_disks) {
int i;
for (i=0; i < conf->strip_zone[0].nb_dev; i++)
conf->devlist[i]->raid_disk /= conf->scale_raid_disks;
/* FIXME update sysfs rd links */
}
/* calculate array device size */
md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
(unsigned long long)mddev->array_sectors);
printk(KERN_INFO "md/raid0:%s: md_size is %llu sectors.\n",
mdname(mddev),
(unsigned long long)mddev->array_sectors);
/* calculate the max read-ahead size.
* For read-ahead of large files to be effective, we need to
* readahead at least twice a whole stripe. i.e. number of devices
@ -402,6 +437,7 @@ static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone,
unsigned int sect_in_chunk;
sector_t chunk;
raid0_conf_t *conf = mddev->private;
int raid_disks = conf->strip_zone[0].nb_dev;
unsigned int chunk_sects = mddev->chunk_sectors;
if (is_power_of_2(chunk_sects)) {
@ -424,7 +460,7 @@ static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone,
* + the position in the chunk
*/
*sector_offset = (chunk * chunk_sects) + sect_in_chunk;
return conf->devlist[(zone - conf->strip_zone)*mddev->raid_disks
return conf->devlist[(zone - conf->strip_zone)*raid_disks
+ sector_div(sector, zone->nb_dev)];
}
@ -444,27 +480,18 @@ static inline int is_io_in_chunk_boundary(mddev_t *mddev,
}
}
static int raid0_make_request(struct request_queue *q, struct bio *bio)
static int raid0_make_request(mddev_t *mddev, struct bio *bio)
{
mddev_t *mddev = q->queuedata;
unsigned int chunk_sects;
sector_t sector_offset;
struct strip_zone *zone;
mdk_rdev_t *tmp_dev;
const int rw = bio_data_dir(bio);
int cpu;
if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
md_barrier_request(mddev, bio);
return 0;
}
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();
chunk_sects = mddev->chunk_sectors;
if (unlikely(!is_io_in_chunk_boundary(mddev, chunk_sects, bio))) {
sector_t sector = bio->bi_sector;
@ -482,9 +509,9 @@ static int raid0_make_request(struct request_queue *q, struct bio *bio)
else
bp = bio_split(bio, chunk_sects -
sector_div(sector, chunk_sects));
if (raid0_make_request(q, &bp->bio1))
if (raid0_make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
if (raid0_make_request(q, &bp->bio2))
if (raid0_make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
bio_pair_release(bp);
@ -504,9 +531,10 @@ static int raid0_make_request(struct request_queue *q, struct bio *bio)
return 1;
bad_map:
printk("raid0_make_request bug: can't convert block across chunks"
" or bigger than %dk %llu %d\n", chunk_sects / 2,
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
printk("md/raid0:%s: make_request bug: can't convert block across chunks"
" or bigger than %dk %llu %d\n",
mdname(mddev), chunk_sects / 2,
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
bio_io_error(bio);
return 0;
@ -519,6 +547,7 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
int j, k, h;
char b[BDEVNAME_SIZE];
raid0_conf_t *conf = mddev->private;
int raid_disks = conf->strip_zone[0].nb_dev;
sector_t zone_size;
sector_t zone_start = 0;
@ -529,7 +558,7 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
seq_printf(seq, "=[");
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
seq_printf(seq, "%s/", bdevname(
conf->devlist[j*mddev->raid_disks + k]
conf->devlist[j*raid_disks + k]
->bdev, b));
zone_size = conf->strip_zone[j].zone_end - zone_start;
@ -544,6 +573,104 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
return;
}
static void *raid0_takeover_raid5(mddev_t *mddev)
{
mdk_rdev_t *rdev;
raid0_conf_t *priv_conf;
if (mddev->degraded != 1) {
printk(KERN_ERR "md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n",
mdname(mddev),
mddev->degraded);
return ERR_PTR(-EINVAL);
}
list_for_each_entry(rdev, &mddev->disks, same_set) {
/* check slot number for a disk */
if (rdev->raid_disk == mddev->raid_disks-1) {
printk(KERN_ERR "md/raid0:%s: raid5 must have missing parity disk!\n",
mdname(mddev));
return ERR_PTR(-EINVAL);
}
}
/* Set new parameters */
mddev->new_level = 0;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks--;
mddev->delta_disks = -1;
/* make sure it will be not marked as dirty */
mddev->recovery_cp = MaxSector;
create_strip_zones(mddev, &priv_conf);
return priv_conf;
}
static void *raid0_takeover_raid10(mddev_t *mddev)
{
raid0_conf_t *priv_conf;
/* Check layout:
* - far_copies must be 1
* - near_copies must be 2
* - disks number must be even
* - all mirrors must be already degraded
*/
if (mddev->layout != ((1 << 8) + 2)) {
printk(KERN_ERR "md/raid0:%s:: Raid0 cannot takover layout: 0x%x\n",
mdname(mddev),
mddev->layout);
return ERR_PTR(-EINVAL);
}
if (mddev->raid_disks & 1) {
printk(KERN_ERR "md/raid0:%s: Raid0 cannot takover Raid10 with odd disk number.\n",
mdname(mddev));
return ERR_PTR(-EINVAL);
}
if (mddev->degraded != (mddev->raid_disks>>1)) {
printk(KERN_ERR "md/raid0:%s: All mirrors must be already degraded!\n",
mdname(mddev));
return ERR_PTR(-EINVAL);
}
/* Set new parameters */
mddev->new_level = 0;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->delta_disks = - mddev->raid_disks / 2;
mddev->raid_disks += mddev->delta_disks;
mddev->degraded = 0;
/* make sure it will be not marked as dirty */
mddev->recovery_cp = MaxSector;
create_strip_zones(mddev, &priv_conf);
priv_conf->scale_raid_disks = 2;
return priv_conf;
}
static void *raid0_takeover(mddev_t *mddev)
{
/* raid0 can take over:
* raid5 - providing it is Raid4 layout and one disk is faulty
* raid10 - assuming we have all necessary active disks
*/
if (mddev->level == 5) {
if (mddev->layout == ALGORITHM_PARITY_N)
return raid0_takeover_raid5(mddev);
printk(KERN_ERR "md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n",
mdname(mddev), ALGORITHM_PARITY_N);
}
if (mddev->level == 10)
return raid0_takeover_raid10(mddev);
return ERR_PTR(-EINVAL);
}
static void raid0_quiesce(mddev_t *mddev, int state)
{
}
static struct mdk_personality raid0_personality=
{
.name = "raid0",
@ -554,6 +681,8 @@ static struct mdk_personality raid0_personality=
.stop = raid0_stop,
.status = raid0_status,
.size = raid0_size,
.takeover = raid0_takeover,
.quiesce = raid0_quiesce,
};
static int __init raid0_init (void)

3
drivers/md/raid0.h
View File

@ -13,6 +13,9 @@ struct raid0_private_data
struct strip_zone *strip_zone;
mdk_rdev_t **devlist; /* lists of rdevs, pointed to by strip_zone->dev */
int nr_strip_zones;
int scale_raid_disks; /* divide rdev->raid_disks by this in run()
* to handle conversion from raid10
*/
};
typedef struct raid0_private_data raid0_conf_t;

114
drivers/md/raid1.c
View File

@ -263,7 +263,7 @@ static inline void update_head_pos(int disk, r1bio_t *r1_bio)
static void raid1_end_read_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
r1bio_t *r1_bio = bio->bi_private;
int mirror;
conf_t *conf = r1_bio->mddev->private;
@ -297,7 +297,8 @@ static void raid1_end_read_request(struct bio *bio, int error)
*/
char b[BDEVNAME_SIZE];
if (printk_ratelimit())
printk(KERN_ERR "raid1: %s: rescheduling sector %llu\n",
printk(KERN_ERR "md/raid1:%s: %s: rescheduling sector %llu\n",
mdname(conf->mddev),
bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector);
reschedule_retry(r1_bio);
}
@ -308,7 +309,7 @@ static void raid1_end_read_request(struct bio *bio, int error)
static void raid1_end_write_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
r1bio_t *r1_bio = bio->bi_private;
int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state);
conf_t *conf = r1_bio->mddev->private;
struct bio *to_put = NULL;
@ -418,7 +419,7 @@ static void raid1_end_write_request(struct bio *bio, int error)
*/
static int read_balance(conf_t *conf, r1bio_t *r1_bio)
{
const unsigned long this_sector = r1_bio->sector;
const sector_t this_sector = r1_bio->sector;
int new_disk = conf->last_used, disk = new_disk;
int wonly_disk = -1;
const int sectors = r1_bio->sectors;
@ -434,7 +435,7 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
retry:
if (conf->mddev->recovery_cp < MaxSector &&
(this_sector + sectors >= conf->next_resync)) {
/* Choose the first operation device, for consistancy */
/* Choose the first operational device, for consistancy */
new_disk = 0;
for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
@ -774,9 +775,8 @@ do_sync_io:
return NULL;
}
static int make_request(struct request_queue *q, struct bio * bio)
static int make_request(mddev_t *mddev, struct bio * bio)
{
mddev_t *mddev = q->queuedata;
conf_t *conf = mddev->private;
mirror_info_t *mirror;
r1bio_t *r1_bio;
@ -788,7 +788,6 @@ static int make_request(struct request_queue *q, struct bio * bio)
struct page **behind_pages = NULL;
const int rw = bio_data_dir(bio);
const bool do_sync = bio_rw_flagged(bio, BIO_RW_SYNCIO);
int cpu;
bool do_barriers;
mdk_rdev_t *blocked_rdev;
@ -834,12 +833,6 @@ static int make_request(struct request_queue *q, struct bio * 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
* used and no empty request is available.
@ -866,6 +859,15 @@ static int make_request(struct request_queue *q, struct bio * bio)
}
mirror = conf->mirrors + rdisk;
if (test_bit(WriteMostly, &mirror->rdev->flags) &&
bitmap) {
/* Reading from a write-mostly device must
* take care not to over-take any writes
* that are 'behind'
*/
wait_event(bitmap->behind_wait,
atomic_read(&bitmap->behind_writes) == 0);
}
r1_bio->read_disk = rdisk;
read_bio = bio_clone(bio, GFP_NOIO);
@ -912,9 +914,10 @@ static int make_request(struct request_queue *q, struct bio * bio)
if (test_bit(Faulty, &rdev->flags)) {
rdev_dec_pending(rdev, mddev);
r1_bio->bios[i] = NULL;
} else
} else {
r1_bio->bios[i] = bio;
targets++;
targets++;
}
} else
r1_bio->bios[i] = NULL;
}
@ -942,10 +945,14 @@ static int make_request(struct request_queue *q, struct bio * bio)
set_bit(R1BIO_Degraded, &r1_bio->state);
}
/* do behind I/O ? */
/* do behind I/O ?
* Not if there are too many, or cannot allocate memory,
* or a reader on WriteMostly is waiting for behind writes
* to flush */
if (bitmap &&
(atomic_read(&bitmap->behind_writes)
< mddev->bitmap_info.max_write_behind) &&
!waitqueue_active(&bitmap->behind_wait) &&
(behind_pages = alloc_behind_pages(bio)) != NULL)
set_bit(R1BIO_BehindIO, &r1_bio->state);
@ -1070,21 +1077,22 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
} else
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
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);
printk(KERN_ALERT "md/raid1:%s: Disk failure on %s, disabling device.\n"
KERN_ALERT "md/raid1:%s: Operation continuing on %d devices.\n",
mdname(mddev), bdevname(rdev->bdev, b),
mdname(mddev), conf->raid_disks - mddev->degraded);
}
static void print_conf(conf_t *conf)
{
int i;
printk("RAID1 conf printout:\n");
printk(KERN_DEBUG "RAID1 conf printout:\n");
if (!conf) {
printk("(!conf)\n");
printk(KERN_DEBUG "(!conf)\n");
return;
}
printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
conf->raid_disks);
rcu_read_lock();
@ -1092,7 +1100,7 @@ static void print_conf(conf_t *conf)
char b[BDEVNAME_SIZE];
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev)
printk(" disk %d, wo:%d, o:%d, dev:%s\n",
printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n",
i, !test_bit(In_sync, &rdev->flags),
!test_bit(Faulty, &rdev->flags),
bdevname(rdev->bdev,b));
@ -1223,7 +1231,7 @@ abort:
static void end_sync_read(struct bio *bio, int error)
{
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
r1bio_t *r1_bio = bio->bi_private;
int i;
for (i=r1_bio->mddev->raid_disks; i--; )
@ -1246,7 +1254,7 @@ static void end_sync_read(struct bio *bio, int error)
static void end_sync_write(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
r1bio_t *r1_bio = bio->bi_private;
mddev_t *mddev = r1_bio->mddev;
conf_t *conf = mddev->private;
int i;
@ -1453,9 +1461,10 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
char b[BDEVNAME_SIZE];
/* Cannot read from anywhere, array is toast */
md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);
printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error"
printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error"
" for block %llu\n",
bdevname(bio->bi_bdev,b),
mdname(mddev),
bdevname(bio->bi_bdev, b),
(unsigned long long)r1_bio->sector);
md_done_sync(mddev, r1_bio->sectors, 0);
put_buf(r1_bio);
@ -1577,7 +1586,7 @@ static void fix_read_error(conf_t *conf, int read_disk,
else {
atomic_add(s, &rdev->corrected_errors);
printk(KERN_INFO
"raid1:%s: read error corrected "
"md/raid1:%s: read error corrected "
"(%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect +
@ -1682,8 +1691,9 @@ static void raid1d(mddev_t *mddev)
bio = r1_bio->bios[r1_bio->read_disk];
if ((disk=read_balance(conf, r1_bio)) == -1) {
printk(KERN_ALERT "raid1: %s: unrecoverable I/O"
printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O"
" read error for block %llu\n",
mdname(mddev),
bdevname(bio->bi_bdev,b),
(unsigned long long)r1_bio->sector);
raid_end_bio_io(r1_bio);
@ -1697,10 +1707,11 @@ static void raid1d(mddev_t *mddev)
r1_bio->bios[r1_bio->read_disk] = bio;
rdev = conf->mirrors[disk].rdev;
if (printk_ratelimit())
printk(KERN_ERR "raid1: %s: redirecting sector %llu to"
" another mirror\n",
bdevname(rdev->bdev,b),
(unsigned long long)r1_bio->sector);
printk(KERN_ERR "md/raid1:%s: redirecting sector %llu to"
" other mirror: %s\n",
mdname(mddev),
(unsigned long long)r1_bio->sector,
bdevname(rdev->bdev,b));
bio->bi_sector = r1_bio->sector + rdev->data_offset;
bio->bi_bdev = rdev->bdev;
bio->bi_end_io = raid1_end_read_request;
@ -1755,13 +1766,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
int still_degraded = 0;
if (!conf->r1buf_pool)
{
/*
printk("sync start - bitmap %p\n", mddev->bitmap);
*/
if (init_resync(conf))
return 0;
}
max_sector = mddev->dev_sectors;
if (sector_nr >= max_sector) {
@ -2042,7 +2048,7 @@ static conf_t *setup_conf(mddev_t *mddev)
err = -EIO;
if (conf->last_used < 0) {
printk(KERN_ERR "raid1: no operational mirrors for %s\n",
printk(KERN_ERR "md/raid1:%s: no operational mirrors\n",
mdname(mddev));
goto abort;
}
@ -2050,7 +2056,7 @@ static conf_t *setup_conf(mddev_t *mddev)
conf->thread = md_register_thread(raid1d, mddev, NULL);
if (!conf->thread) {
printk(KERN_ERR
"raid1: couldn't allocate thread for %s\n",
"md/raid1:%s: couldn't allocate thread\n",
mdname(mddev));
goto abort;
}
@ -2076,12 +2082,12 @@ static int run(mddev_t *mddev)
mdk_rdev_t *rdev;
if (mddev->level != 1) {
printk("raid1: %s: raid level not set to mirroring (%d)\n",
printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n",
mdname(mddev), mddev->level);
return -EIO;
}
if (mddev->reshape_position != MaxSector) {
printk("raid1: %s: reshape_position set but not supported\n",
printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n",
mdname(mddev));
return -EIO;
}
@ -2124,11 +2130,11 @@ static int run(mddev_t *mddev)
mddev->recovery_cp = MaxSector;
if (mddev->recovery_cp != MaxSector)
printk(KERN_NOTICE "raid1: %s is not clean"
printk(KERN_NOTICE "md/raid1:%s: not clean"
" -- starting background reconstruction\n",
mdname(mddev));
printk(KERN_INFO
"raid1: raid set %s active with %d out of %d mirrors\n",
"md/raid1:%s: active with %d out of %d mirrors\n",
mdname(mddev), mddev->raid_disks - mddev->degraded,
mddev->raid_disks);
@ -2152,15 +2158,14 @@ static int stop(mddev_t *mddev)
{
conf_t *conf = mddev->private;
struct bitmap *bitmap = mddev->bitmap;
int behind_wait = 0;
/* wait for behind writes to complete */
while (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
behind_wait++;
printk(KERN_INFO "raid1: behind writes in progress on device %s, waiting to stop (%d)\n", mdname(mddev), behind_wait);
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ); /* wait a second */
if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n",
mdname(mddev));
/* need to kick something here to make sure I/O goes? */
wait_event(bitmap->behind_wait,
atomic_read(&bitmap->behind_writes) == 0);
}
raise_barrier(conf);
@ -2191,7 +2196,6 @@ static int raid1_resize(mddev_t *mddev, sector_t sectors)
if (mddev->array_sectors > raid1_size(mddev, sectors, 0))
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) {
@ -2286,9 +2290,9 @@ static int raid1_reshape(mddev_t *mddev)
if (sysfs_create_link(&mddev->kobj,
&rdev->kobj, nm))
printk(KERN_WARNING
"md/raid1: cannot register "
"%s for %s\n",
nm, mdname(mddev));
"md/raid1:%s: cannot register "
"%s\n",
mdname(mddev), nm);
}
if (rdev)
newmirrors[d2++].rdev = rdev;

300
drivers/md/raid10.c
View File

@ -24,6 +24,7 @@
#include <linux/seq_file.h>
#include "md.h"
#include "raid10.h"
#include "raid0.h"
#include "bitmap.h"
/*
@ -255,7 +256,7 @@ static inline void update_head_pos(int slot, r10bio_t *r10_bio)
static void raid10_end_read_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
r10bio_t *r10_bio = bio->bi_private;
int slot, dev;
conf_t *conf = r10_bio->mddev->private;
@ -285,7 +286,8 @@ static void raid10_end_read_request(struct bio *bio, int error)
*/
char b[BDEVNAME_SIZE];
if (printk_ratelimit())
printk(KERN_ERR "raid10: %s: rescheduling sector %llu\n",
printk(KERN_ERR "md/raid10:%s: %s: rescheduling sector %llu\n",
mdname(conf->mddev),
bdevname(conf->mirrors[dev].rdev->bdev,b), (unsigned long long)r10_bio->sector);
reschedule_retry(r10_bio);
}
@ -296,7 +298,7 @@ static void raid10_end_read_request(struct bio *bio, int error)
static void raid10_end_write_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
r10bio_t *r10_bio = bio->bi_private;
int slot, dev;
conf_t *conf = r10_bio->mddev->private;
@ -494,7 +496,7 @@ static int raid10_mergeable_bvec(struct request_queue *q,
*/
static int read_balance(conf_t *conf, r10bio_t *r10_bio)
{
const unsigned long this_sector = r10_bio->sector;
const sector_t this_sector = r10_bio->sector;
int disk, slot, nslot;
const int sectors = r10_bio->sectors;
sector_t new_distance, current_distance;
@ -601,7 +603,7 @@ static void unplug_slaves(mddev_t *mddev)
int i;
rcu_read_lock();
for (i=0; i<mddev->raid_disks; i++) {
for (i=0; i < conf->raid_disks; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
@ -635,7 +637,7 @@ static int raid10_congested(void *data, int bits)
if (mddev_congested(mddev, bits))
return 1;
rcu_read_lock();
for (i = 0; i < mddev->raid_disks && ret == 0; i++) {
for (i = 0; i < conf->raid_disks && ret == 0; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags)) {
struct request_queue *q = bdev_get_queue(rdev->bdev);
@ -788,14 +790,12 @@ static void unfreeze_array(conf_t *conf)
spin_unlock_irq(&conf->resync_lock);
}
static int make_request(struct request_queue *q, struct bio * bio)
static int make_request(mddev_t *mddev, struct bio * bio)
{
mddev_t *mddev = q->queuedata;
conf_t *conf = mddev->private;
mirror_info_t *mirror;
r10bio_t *r10_bio;
struct bio *read_bio;
int cpu;
int i;
int chunk_sects = conf->chunk_mask + 1;
const int rw = bio_data_dir(bio);
@ -825,16 +825,16 @@ static int make_request(struct request_queue *q, struct bio * bio)
*/
bp = bio_split(bio,
chunk_sects - (bio->bi_sector & (chunk_sects - 1)) );
if (make_request(q, &bp->bio1))
if (make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
if (make_request(q, &bp->bio2))
if (make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
bio_pair_release(bp);
return 0;
bad_map:
printk("raid10_make_request bug: can't convert block across chunks"
" or bigger than %dk %llu %d\n", chunk_sects/2,
printk("md/raid10:%s: make_request bug: can't convert block across chunks"
" or bigger than %dk %llu %d\n", mdname(mddev), chunk_sects/2,
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
bio_io_error(bio);
@ -850,12 +850,6 @@ static int make_request(struct request_queue *q, struct bio * bio)
*/
wait_barrier(conf);
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();
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
r10_bio->master_bio = bio;
@ -1039,9 +1033,10 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
}
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
printk(KERN_ALERT "raid10: Disk failure on %s, disabling device.\n"
"raid10: Operation continuing on %d devices.\n",
bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
printk(KERN_ALERT "md/raid10:%s: Disk failure on %s, disabling device.\n"
KERN_ALERT "md/raid10:%s: Operation continuing on %d devices.\n",
mdname(mddev), bdevname(rdev->bdev, b),
mdname(mddev), conf->raid_disks - mddev->degraded);
}
static void print_conf(conf_t *conf)
@ -1049,19 +1044,19 @@ static void print_conf(conf_t *conf)
int i;
mirror_info_t *tmp;
printk("RAID10 conf printout:\n");
printk(KERN_DEBUG "RAID10 conf printout:\n");
if (!conf) {
printk("(!conf)\n");
printk(KERN_DEBUG "(!conf)\n");
return;
}
printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
conf->raid_disks);
for (i = 0; i < conf->raid_disks; i++) {
char b[BDEVNAME_SIZE];
tmp = conf->mirrors + i;
if (tmp->rdev)
printk(" disk %d, wo:%d, o:%d, dev:%s\n",
printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n",
i, !test_bit(In_sync, &tmp->rdev->flags),
!test_bit(Faulty, &tmp->rdev->flags),
bdevname(tmp->rdev->bdev,b));
@ -1132,7 +1127,7 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
int mirror;
mirror_info_t *p;
int first = 0;
int last = mddev->raid_disks - 1;
int last = conf->raid_disks - 1;
if (mddev->recovery_cp < MaxSector)
/* only hot-add to in-sync arrays, as recovery is
@ -1224,7 +1219,7 @@ abort:
static void end_sync_read(struct bio *bio, int error)
{
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
r10bio_t *r10_bio = bio->bi_private;
conf_t *conf = r10_bio->mddev->private;
int i,d;
@ -1261,7 +1256,7 @@ static void end_sync_read(struct bio *bio, int error)
static void end_sync_write(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
r10bio_t *r10_bio = bio->bi_private;
mddev_t *mddev = r10_bio->mddev;
conf_t *conf = mddev->private;
int i,d;
@ -1510,13 +1505,14 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
if (cur_read_error_count > max_read_errors) {
rcu_read_unlock();
printk(KERN_NOTICE
"raid10: %s: Raid device exceeded "
"md/raid10:%s: %s: Raid device exceeded "
"read_error threshold "
"[cur %d:max %d]\n",
mdname(mddev),
b, cur_read_error_count, max_read_errors);
printk(KERN_NOTICE
"raid10: %s: Failing raid "
"device\n", b);
"md/raid10:%s: %s: Failing raid "
"device\n", mdname(mddev), b);
md_error(mddev, conf->mirrors[d].rdev);
return;
}
@ -1586,15 +1582,16 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
== 0) {
/* Well, this device is dead */
printk(KERN_NOTICE
"raid10:%s: read correction "
"md/raid10:%s: read correction "
"write failed"
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect+
rdev->data_offset),
bdevname(rdev->bdev, b));
printk(KERN_NOTICE "raid10:%s: failing "
printk(KERN_NOTICE "md/raid10:%s: %s: failing "
"drive\n",
mdname(mddev),
bdevname(rdev->bdev, b));
md_error(mddev, rdev);
}
@ -1622,20 +1619,21 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
READ) == 0) {
/* Well, this device is dead */
printk(KERN_NOTICE
"raid10:%s: unable to read back "
"md/raid10:%s: unable to read back "
"corrected sectors"
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect+
rdev->data_offset),
bdevname(rdev->bdev, b));
printk(KERN_NOTICE "raid10:%s: failing drive\n",
printk(KERN_NOTICE "md/raid10:%s: %s: failing drive\n",
mdname(mddev),
bdevname(rdev->bdev, b));
md_error(mddev, rdev);
} else {
printk(KERN_INFO
"raid10:%s: read error corrected"
"md/raid10:%s: read error corrected"
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect+
@ -1710,8 +1708,9 @@ static void raid10d(mddev_t *mddev)
mddev->ro ? IO_BLOCKED : NULL;
mirror = read_balance(conf, r10_bio);
if (mirror == -1) {
printk(KERN_ALERT "raid10: %s: unrecoverable I/O"
printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O"
" read error for block %llu\n",
mdname(mddev),
bdevname(bio->bi_bdev,b),
(unsigned long long)r10_bio->sector);
raid_end_bio_io(r10_bio);
@ -1721,8 +1720,9 @@ static void raid10d(mddev_t *mddev)
bio_put(bio);
rdev = conf->mirrors[mirror].rdev;
if (printk_ratelimit())
printk(KERN_ERR "raid10: %s: redirecting sector %llu to"
printk(KERN_ERR "md/raid10:%s: %s: redirecting sector %llu to"
" another mirror\n",
mdname(mddev),
bdevname(rdev->bdev,b),
(unsigned long long)r10_bio->sector);
bio = bio_clone(r10_bio->master_bio, GFP_NOIO);
@ -1980,7 +1980,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
r10_bio = rb2;
if (!test_and_set_bit(MD_RECOVERY_INTR,
&mddev->recovery))
printk(KERN_INFO "raid10: %s: insufficient working devices for recovery.\n",
printk(KERN_INFO "md/raid10:%s: insufficient "
"working devices for recovery.\n",
mdname(mddev));
break;
}
@ -2140,9 +2141,9 @@ raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
conf_t *conf = mddev->private;
if (!raid_disks)
raid_disks = mddev->raid_disks;
raid_disks = conf->raid_disks;
if (!sectors)
sectors = mddev->dev_sectors;
sectors = conf->dev_sectors;
size = sectors >> conf->chunk_shift;
sector_div(size, conf->far_copies);
@ -2152,62 +2153,61 @@ raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
return size << conf->chunk_shift;
}
static int run(mddev_t *mddev)
static conf_t *setup_conf(mddev_t *mddev)
{
conf_t *conf;
int i, disk_idx, chunk_size;
mirror_info_t *disk;
mdk_rdev_t *rdev;
conf_t *conf = NULL;
int nc, fc, fo;
sector_t stride, size;
int err = -EINVAL;
if (mddev->chunk_sectors < (PAGE_SIZE >> 9) ||
!is_power_of_2(mddev->chunk_sectors)) {
printk(KERN_ERR "md/raid10: chunk size must be "
"at least PAGE_SIZE(%ld) and be a power of 2.\n", PAGE_SIZE);
return -EINVAL;
printk(KERN_ERR "md/raid10:%s: chunk size must be "
"at least PAGE_SIZE(%ld) and be a power of 2.\n",
mdname(mddev), PAGE_SIZE);
goto out;
}
nc = mddev->layout & 255;
fc = (mddev->layout >> 8) & 255;
fo = mddev->layout & (1<<16);
if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks ||
(mddev->layout >> 17)) {
printk(KERN_ERR "raid10: %s: unsupported raid10 layout: 0x%8x\n",
printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
mdname(mddev), mddev->layout);
goto out;
}
/*
* copy the already verified devices into our private RAID10
* bookkeeping area. [whatever we allocate in run(),
* should be freed in stop()]
*/
err = -ENOMEM;
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));
if (!conf)
goto out;
}
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;
}
GFP_KERNEL);
if (!conf->mirrors)
goto out;
conf->tmppage = alloc_page(GFP_KERNEL);
if (!conf->tmppage)
goto out_free_conf;
goto out;
conf->raid_disks = mddev->raid_disks;
conf->near_copies = nc;
conf->far_copies = fc;
conf->copies = nc*fc;
conf->far_offset = fo;
conf->chunk_mask = mddev->chunk_sectors - 1;
conf->chunk_shift = ffz(~mddev->chunk_sectors);
conf->chunk_mask = mddev->new_chunk_sectors - 1;
conf->chunk_shift = ffz(~mddev->new_chunk_sectors);
conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
r10bio_pool_free, conf);
if (!conf->r10bio_pool)
goto out;
size = mddev->dev_sectors >> conf->chunk_shift;
sector_div(size, fc);
size = size * conf->raid_disks;
@ -2221,7 +2221,8 @@ static int run(mddev_t *mddev)
*/
stride += conf->raid_disks - 1;
sector_div(stride, conf->raid_disks);
mddev->dev_sectors = stride << conf->chunk_shift;
conf->dev_sectors = stride << conf->chunk_shift;
if (fo)
stride = 1;
@ -2229,18 +2230,63 @@ static int run(mddev_t *mddev)
sector_div(stride, fc);
conf->stride = stride << conf->chunk_shift;
conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
r10bio_pool_free, conf);
if (!conf->r10bio_pool) {
printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
mdname(mddev));
goto out_free_conf;
}
conf->mddev = mddev;
spin_lock_init(&conf->device_lock);
INIT_LIST_HEAD(&conf->retry_list);
spin_lock_init(&conf->resync_lock);
init_waitqueue_head(&conf->wait_barrier);
conf->thread = md_register_thread(raid10d, mddev, NULL);
if (!conf->thread)
goto out;
conf->scale_disks = 0;
conf->mddev = mddev;
return conf;
out:
printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n",
mdname(mddev));
if (conf) {
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
kfree(conf->mirrors);
safe_put_page(conf->tmppage);
kfree(conf);
}
return ERR_PTR(err);
}
static int run(mddev_t *mddev)
{
conf_t *conf;
int i, disk_idx, chunk_size;
mirror_info_t *disk;
mdk_rdev_t *rdev;
sector_t size;
/*
* copy the already verified devices into our private RAID10
* bookkeeping area. [whatever we allocate in run(),
* should be freed in stop()]
*/
if (mddev->private == NULL) {
conf = setup_conf(mddev);
if (IS_ERR(conf))
return PTR_ERR(conf);
mddev->private = conf;
}
conf = mddev->private;
if (!conf)
goto out;
mddev->queue->queue_lock = &conf->device_lock;
mddev->thread = conf->thread;
conf->thread = NULL;
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
if (conf->raid_disks % conf->near_copies)
@ -2251,9 +2297,14 @@ static int run(mddev_t *mddev)
list_for_each_entry(rdev, &mddev->disks, same_set) {
disk_idx = rdev->raid_disk;
if (disk_idx >= mddev->raid_disks
if (disk_idx >= conf->raid_disks
|| disk_idx < 0)
continue;
if (conf->scale_disks) {
disk_idx *= conf->scale_disks;
rdev->raid_disk = disk_idx;
/* MOVE 'rd%d' link !! */
}
disk = conf->mirrors + disk_idx;
disk->rdev = rdev;
@ -2271,14 +2322,9 @@ static int run(mddev_t *mddev)
disk->head_position = 0;
}
INIT_LIST_HEAD(&conf->retry_list);
spin_lock_init(&conf->resync_lock);
init_waitqueue_head(&conf->wait_barrier);
/* need to check that every block has at least one working mirror */
if (!enough(conf)) {
printk(KERN_ERR "raid10: not enough operational mirrors for %s\n",
printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n",
mdname(mddev));
goto out_free_conf;
}
@ -2297,28 +2343,21 @@ static int run(mddev_t *mddev)
}
}
mddev->thread = md_register_thread(raid10d, mddev, NULL);
if (!mddev->thread) {
printk(KERN_ERR
"raid10: couldn't allocate thread for %s\n",
mdname(mddev));
goto out_free_conf;
}
if (mddev->recovery_cp != MaxSector)
printk(KERN_NOTICE "raid10: %s is not clean"
printk(KERN_NOTICE "md/raid10:%s: not clean"
" -- starting background reconstruction\n",
mdname(mddev));
printk(KERN_INFO
"raid10: raid set %s active with %d out of %d devices\n",
mdname(mddev), mddev->raid_disks - mddev->degraded,
mddev->raid_disks);
"md/raid10:%s: active with %d out of %d devices\n",
mdname(mddev), conf->raid_disks - mddev->degraded,
conf->raid_disks);
/*
* Ok, everything is just fine now
*/
md_set_array_sectors(mddev, raid10_size(mddev, 0, 0));
mddev->resync_max_sectors = raid10_size(mddev, 0, 0);
mddev->dev_sectors = conf->dev_sectors;
size = raid10_size(mddev, 0, 0);
md_set_array_sectors(mddev, size);
mddev->resync_max_sectors = size;
mddev->queue->unplug_fn = raid10_unplug;
mddev->queue->backing_dev_info.congested_fn = raid10_congested;
@ -2336,7 +2375,7 @@ static int run(mddev_t *mddev)
mddev->queue->backing_dev_info.ra_pages = 2* stripe;
}
if (conf->near_copies < mddev->raid_disks)
if (conf->near_copies < conf->raid_disks)
blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
md_integrity_register(mddev);
return 0;
@ -2348,6 +2387,7 @@ out_free_conf:
kfree(conf->mirrors);
kfree(conf);
mddev->private = NULL;
md_unregister_thread(mddev->thread);
out:
return -EIO;
}
@ -2384,6 +2424,61 @@ static void raid10_quiesce(mddev_t *mddev, int state)
}
}
static void *raid10_takeover_raid0(mddev_t *mddev)
{
mdk_rdev_t *rdev;
conf_t *conf;
if (mddev->degraded > 0) {
printk(KERN_ERR "md/raid10:%s: Error: degraded raid0!\n",
mdname(mddev));
return ERR_PTR(-EINVAL);
}
/* Update slot numbers to obtain
* degraded raid10 with missing mirrors
*/
list_for_each_entry(rdev, &mddev->disks, same_set) {
rdev->raid_disk *= 2;
}
/* Set new parameters */
mddev->new_level = 10;
/* new layout: far_copies = 1, near_copies = 2 */
mddev->new_layout = (1<<8) + 2;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->delta_disks = mddev->raid_disks;
mddev->degraded = mddev->raid_disks;
mddev->raid_disks *= 2;
/* make sure it will be not marked as dirty */
mddev->recovery_cp = MaxSector;
conf = setup_conf(mddev);
conf->scale_disks = 2;
return conf;
}
static void *raid10_takeover(mddev_t *mddev)
{
struct raid0_private_data *raid0_priv;
/* raid10 can take over:
* raid0 - providing it has only two drives
*/
if (mddev->level == 0) {
/* for raid0 takeover only one zone is supported */
raid0_priv = mddev->private;
if (raid0_priv->nr_strip_zones > 1) {
printk(KERN_ERR "md/raid10:%s: cannot takeover raid 0"
" with more than one zone.\n",
mdname(mddev));
return ERR_PTR(-EINVAL);
}
return raid10_takeover_raid0(mddev);
}
return ERR_PTR(-EINVAL);
}
static struct mdk_personality raid10_personality =
{
.name = "raid10",
@ -2400,6 +2495,7 @@ static struct mdk_personality raid10_personality =
.sync_request = sync_request,
.quiesce = raid10_quiesce,
.size = raid10_size,
.takeover = raid10_takeover,
};
static int __init raid_init(void)

12
drivers/md/raid10.h
View File

@ -33,9 +33,16 @@ struct r10_private_data_s {
* 1 stripe.
*/
sector_t dev_sectors; /* temp copy of mddev->dev_sectors */
int chunk_shift; /* shift from chunks to sectors */
sector_t chunk_mask;
int scale_disks; /* When starting array, multiply
* each ->raid_disk by this.
* Need for raid0->raid10 migration
*/
struct list_head retry_list;
/* queue pending writes and submit them on unplug */
struct bio_list pending_bio_list;
@ -57,6 +64,11 @@ struct r10_private_data_s {
mempool_t *r10bio_pool;
mempool_t *r10buf_pool;
struct page *tmppage;
/* When taking over an array from a different personality, we store
* the new thread here until we fully activate the array.
*/
struct mdk_thread_s *thread;
};
typedef struct r10_private_data_s conf_t;

231
drivers/md/raid5.c
View File

@ -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;
@ -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)