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Commit 6791875e authored by NeilBrown's avatar NeilBrown
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md: make reconfig_mutex optional for writes to md sysfs files. 

Rather than using mddev_lock() to take the reconfig_mutex
when writing to any md sysfs file, we only take mddev_lock()
in the particular _store() functions that require it.
Admittedly this is most, but it isn't all.

This also allows us to remove special-case handling for new_dev_store
(in md_attr_store).
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 5c47daf6
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Showing with 316 additions and 164 deletions
drivers/md/md.c
View file @ 6791875e
......@@ -3256,26 +3256,32 @@ static ssize_t
level_store(struct mddev *mddev, const char *buf, size_t len)
{
char clevel[16];
ssize_t rv = len;
ssize_t rv;
size_t slen = len;
struct md_personality *pers, *oldpers;
long level;
void *priv, *oldpriv;
struct md_rdev *rdev;
if (slen == 0 || slen >= sizeof(clevel))
return -EINVAL;
rv = mddev_lock(mddev);
if (rv)
return rv;
if (mddev->pers == NULL) {
if (len == 0)
return 0;
if (len >= sizeof(mddev->clevel))
return -ENOSPC;
strncpy(mddev->clevel, buf, len);
if (mddev->clevel[len-1] == '\n')
len--;
mddev->clevel[len] = 0;
strncpy(mddev->clevel, buf, slen);
if (mddev->clevel[slen-1] == '\n')
slen--;
mddev->clevel[slen] = 0;
mddev->level = LEVEL_NONE;
return rv;
rv = len;
goto out_unlock;
}
rv = -EROFS;
if (mddev->ro)
return -EROFS;
goto out_unlock;
/* request to change the personality. Need to ensure:
* - array is not engaged in resync/recovery/reshape
......@@ -3283,25 +3289,25 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
* - new personality will access other array.
*/
rv = -EBUSY;
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
mddev->reshape_position != MaxSector ||
mddev->sysfs_active)
return -EBUSY;
goto out_unlock;
rv = -EINVAL;
if (!mddev->pers->quiesce) {
printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
mdname(mddev), mddev->pers->name);
return -EINVAL;
goto out_unlock;
}
/* Now find the new personality */
if (len == 0 || len >= sizeof(clevel))
return -EINVAL;
strncpy(clevel, buf, len);
if (clevel[len-1] == '\n')
len--;
clevel[len] = 0;
strncpy(clevel, buf, slen);
if (clevel[slen-1] == '\n')
slen--;
clevel[slen] = 0;
if (kstrtol(clevel, 10, &level))
level = LEVEL_NONE;
......@@ -3312,20 +3318,23 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
return -EINVAL;
rv = -EINVAL;
goto out_unlock;
}
spin_unlock(&pers_lock);
if (pers == mddev->pers) {
/* Nothing to do! */
module_put(pers->owner);
return rv;
rv = len;
goto out_unlock;
}
if (!pers->takeover) {
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
mdname(mddev), clevel);
return -EINVAL;
rv = -EINVAL;
goto out_unlock;
}
rdev_for_each(rdev, mddev)
......@@ -3345,7 +3354,8 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s would not accept array\n",
mdname(mddev), clevel);
return PTR_ERR(priv);
rv = PTR_ERR(priv);
goto out_unlock;
}
/* Looks like we have a winner */
......@@ -3438,6 +3448,9 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
md_update_sb(mddev, 1);
sysfs_notify(&mddev->kobj, NULL, "level");
md_new_event(mddev);
rv = len;
out_unlock:
mddev_unlock(mddev);
return rv;
}
......@@ -3460,28 +3473,32 @@ layout_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
int err;
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers) {
int err;
if (mddev->pers->check_reshape == NULL)
return -EBUSY;
if (mddev->ro)
return -EROFS;
err = -EBUSY;
else if (mddev->ro)
err = -EROFS;
else {
mddev->new_layout = n;
err = mddev->pers->check_reshape(mddev);
if (err) {
if (err)
mddev->new_layout = mddev->layout;
return err;
}
} else {
mddev->new_layout = n;
if (mddev->reshape_position == MaxSector)
mddev->layout = n;
}
return len;
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_layout =
__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
......@@ -3504,32 +3521,39 @@ static ssize_t
raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
int rv = 0;
int err;
unsigned long n = simple_strtoul(buf, &e, 10);
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers)
rv = update_raid_disks(mddev, n);
err = update_raid_disks(mddev, n);
else if (mddev->reshape_position != MaxSector) {
struct md_rdev *rdev;
int olddisks = mddev->raid_disks - mddev->delta_disks;
err = -EINVAL;
rdev_for_each(rdev, mddev) {
if (olddisks < n &&
rdev->data_offset < rdev->new_data_offset)
return -EINVAL;
goto out_unlock;
if (olddisks > n &&
rdev->data_offset > rdev->new_data_offset)
return -EINVAL;
goto out_unlock;
}
err = 0;
mddev->delta_disks = n - olddisks;
mddev->raid_disks = n;
mddev->reshape_backwards = (mddev->delta_disks < 0);
} else
mddev->raid_disks = n;
return rv ? rv : len;
out_unlock:
mddev_unlock(mddev);
return err ? err : len;
}
static struct md_sysfs_entry md_raid_disks =
__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
......@@ -3548,30 +3572,34 @@ chunk_size_show(struct mddev *mddev, char *page)
static ssize_t
chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
{
int err;
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers) {
int err;
if (mddev->pers->check_reshape == NULL)
return -EBUSY;
if (mddev->ro)
return -EROFS;
err = -EBUSY;
else if (mddev->ro)
err = -EROFS;
else {
mddev->new_chunk_sectors = n >> 9;
err = mddev->pers->check_reshape(mddev);
if (err) {
if (err)
mddev->new_chunk_sectors = mddev->chunk_sectors;
return err;
}
} else {
mddev->new_chunk_sectors = n >> 9;
if (mddev->reshape_position == MaxSector)
mddev->chunk_sectors = n >> 9;
}
return len;
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
......@@ -3587,20 +3615,27 @@ resync_start_show(struct mddev *mddev, char *page)
static ssize_t
resync_start_store(struct mddev *mddev, const char *buf, size_t len)
{
int err;
char *e;
unsigned long long n = simple_strtoull(buf, &e, 10);
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
return -EBUSY;
if (cmd_match(buf, "none"))
err = -EBUSY;
else if (cmd_match(buf, "none"))
n = MaxSector;
else if (!*buf || (*e && *e != '\n'))
return -EINVAL;
err = -EINVAL;
if (!err) {
mddev->recovery_cp = n;
if (mddev->pers)
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
return len;
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_resync_start =
__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
......@@ -3698,8 +3733,39 @@ static int restart_array(struct mddev *mddev);
static ssize_t
array_state_store(struct mddev *mddev, const char *buf, size_t len)
{
int err = -EINVAL;
int err;
enum array_state st = match_word(buf, array_states);
if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
/* don't take reconfig_mutex when toggling between
* clean and active
*/
spin_lock(&mddev->lock);
if (st == active) {
restart_array(mddev);
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
wake_up(&mddev->sb_wait);
err = 0;
} else /* st == clean */ {
restart_array(mddev);
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
if (mddev->safemode == 1)
mddev->safemode = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
err = 0;
} else
err = -EBUSY;
}
spin_unlock(&mddev->lock);
return err;
}
err = mddev_lock(mddev);
if (err)
return err;
err = -EINVAL;
switch(st) {
case bad_word:
break;
......@@ -3775,14 +3841,14 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
/* these cannot be set */
break;
}
if (err)
return err;
else {
if (!err) {
if (mddev->hold_active == UNTIL_IOCTL)
mddev->hold_active = 0;
sysfs_notify_dirent_safe(mddev->sysfs_state);
return len;
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_array_state =
__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
......@@ -3843,6 +3909,11 @@ new_dev_store(struct mddev *mddev, const char *buf, size_t len)
minor != MINOR(dev))
return -EOVERFLOW;
flush_workqueue(md_misc_wq);
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->persistent) {
rdev = md_import_device(dev, mddev->major_version,
mddev->minor_version);
......@@ -3866,6 +3937,7 @@ new_dev_store(struct mddev *mddev, const char *buf, size_t len)
out:
if (err)
export_rdev(rdev);
mddev_unlock(mddev);
return err ? err : len;
}
......@@ -3877,7 +3949,11 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len)
{
char *end;
unsigned long chunk, end_chunk;
int err;
err = mddev_lock(mddev);
if (err)
return err;
if (!mddev->bitmap)
goto out;
/* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
......@@ -3895,6 +3971,7 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len)
}
bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
out:
mddev_unlock(mddev);
return len;
}
......@@ -3922,6 +3999,9 @@ size_store(struct mddev *mddev, const char *buf, size_t len)
if (err < 0)
return err;
err = mddev_lock(mddev);
if (err)
return err;
if (mddev->pers) {
err = update_size(mddev, sectors);
md_update_sb(mddev, 1);
......@@ -3932,6 +4012,7 @@ size_store(struct mddev *mddev, const char *buf, size_t len)
else
err = -ENOSPC;
}
mddev_unlock(mddev);
return err ? err : len;
}
......@@ -3961,21 +4042,28 @@ metadata_store(struct mddev *mddev, const char *buf, size_t len)
{
int major, minor;
char *e;
int err;
/* Changing the details of 'external' metadata is
* always permitted. Otherwise there must be
* no devices attached to the array.
*/
err = mddev_lock(mddev);
if (err)
return err;
err = -EBUSY;
if (mddev->external && strncmp(buf, "external:", 9) == 0)
;
else if (!list_empty(&mddev->disks))
return -EBUSY;
goto out_unlock;
err = 0;
if (cmd_match(buf, "none")) {
mddev->persistent = 0;
mddev->external = 0;
mddev->major_version = 0;
mddev->minor_version = 90;
return len;
goto out_unlock;
}
if (strncmp(buf, "external:", 9) == 0) {
size_t namelen = len-9;
......@@ -3989,22 +4077,27 @@ metadata_store(struct mddev *mddev, const char *buf, size_t len)
mddev->external = 1;
mddev->major_version = 0;
mddev->minor_version = 90;
return len;
goto out_unlock;
}
major = simple_strtoul(buf, &e, 10);
err = -EINVAL;
if (e==buf || *e != '.')
return -EINVAL;
goto out_unlock;
buf = e+1;
minor = simple_strtoul(buf, &e, 10);
if (e==buf || (*e && *e != '\n') )
return -EINVAL;
goto out_unlock;
err = -ENOENT;
if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
return -ENOENT;
goto out_unlock;
mddev->major_version = major;
mddev->minor_version = minor;
mddev->persistent = 1;
mddev->external = 0;
return len;
err = 0;
out_unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_metadata =
......@@ -4049,7 +4142,10 @@ action_store(struct mddev *mddev, const char *page, size_t len)
flush_workqueue(md_misc_wq);
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
if (mddev_lock(mddev) == 0) {
md_reap_sync_thread(mddev);
mddev_unlock(mddev);
}
}
} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
......@@ -4063,7 +4159,11 @@ action_store(struct mddev *mddev, const char *page, size_t len)
int err;
if (mddev->pers->start_reshape == NULL)
return -EINVAL;
err = mddev_lock(mddev);
if (!err) {
err = mddev->pers->start_reshape(mddev);
mddev_unlock(mddev);
}
if (err)
return err;
sysfs_notify(&mddev->kobj, NULL, "degraded");
......@@ -4346,14 +4446,20 @@ suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
unsigned long long old = mddev->suspend_lo;
unsigned long long old;
int err;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
err = -EINVAL;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
goto unlock;
old = mddev->suspend_lo;
mddev->suspend_lo = new;
if (new >= old)
/* Shrinking suspended region */
......@@ -4363,7 +4469,10 @@ suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
}
return len;
err = 0;
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_suspend_lo =
__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
......@@ -4379,14 +4488,20 @@ suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
unsigned long long old = mddev->suspend_hi;
unsigned long long old;
int err;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
err = -EINVAL;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
goto unlock;
old = mddev->suspend_hi;
mddev->suspend_hi = new;
if (new <= old)
/* Shrinking suspended region */
......@@ -4396,7 +4511,10 @@ suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
}
return len;
err = 0;
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_suspend_hi =
__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
......@@ -4416,11 +4534,17 @@ reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
{
struct md_rdev *rdev;
char *e;
int err;
unsigned long long new = simple_strtoull(buf, &e, 10);
if (mddev->pers)
return -EBUSY;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
err = -EBUSY;
if (mddev->pers)
goto unlock;
mddev->reshape_position = new;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
......@@ -4429,7 +4553,10 @@ reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
mddev->new_chunk_sectors = mddev->chunk_sectors;
rdev_for_each(rdev, mddev)
rdev->new_data_offset = rdev->data_offset;
return len;
err = 0;
unlock:
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_reshape_position =
......@@ -4447,6 +4574,8 @@ static ssize_t
reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
{
int backwards = 0;
int err;
if (cmd_match(buf, "forwards"))
backwards = 0;
else if (cmd_match(buf, "backwards"))
......@@ -4456,16 +4585,19 @@ reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
if (mddev->reshape_backwards == backwards)
return len;
err = mddev_lock(mddev);
if (err)
return err;
/* check if we are allowed to change */
if (mddev->delta_disks)
return -EBUSY;
if (mddev->persistent &&
err = -EBUSY;
else if (mddev->persistent &&
mddev->major_version == 0)
return -EINVAL;
err = -EINVAL;
else
mddev->reshape_backwards = backwards;
return len;
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_reshape_direction =
......@@ -4486,6 +4618,11 @@ static ssize_t
array_size_store(struct mddev *mddev, const char *buf, size_t len)
{
sector_t sectors;
int err;
err = mddev_lock(mddev);
if (err)
return err;
if (strncmp(buf, "default", 7) == 0) {
if (mddev->pers)
......@@ -4496,19 +4633,22 @@ array_size_store(struct mddev *mddev, const char *buf, size_t len)
mddev->external_size = 0;
} else {
if (strict_blocks_to_sectors(buf, &sectors) < 0)
return -EINVAL;
if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
return -E2BIG;
err = -EINVAL;
else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
err = -E2BIG;
else
mddev->external_size = 1;
}
if (!err) {
mddev->array_sectors = sectors;
if (mddev->pers) {
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
}
return len;
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry md_array_size =
......@@ -4596,13 +4736,7 @@ md_attr_store(struct kobject *kobj, struct attribute *attr,
}
mddev_get(mddev);
spin_unlock(&all_mddevs_lock);
if (entry->store == new_dev_store)
flush_workqueue(md_misc_wq);
rv = mddev_lock(mddev);
if (!rv) {
rv = entry->store(mddev, page, length);
mddev_unlock(mddev);
}
mddev_put(mddev);
return rv;
}
......
drivers/md/raid5.c
View file @ 6791875e
......@@ -5400,21 +5400,25 @@ EXPORT_SYMBOL(raid5_set_cache_size);
static ssize_t
raid5_store_stripe_cache_size(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf = mddev->private;
struct r5conf *conf;
unsigned long new;
int err;
if (len >= PAGE_SIZE)
return -EINVAL;
if (!conf)
return -ENODEV;
if (kstrtoul(page, 10, &new))
return -EINVAL;
err = raid5_set_cache_size(mddev, new);
err = mddev_lock(mddev);
if (err)
return err;
return len;
conf = mddev->private;
if (!conf)
err = -ENODEV;
else
err = raid5_set_cache_size(mddev, new);
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry
......@@ -5438,19 +5442,27 @@ raid5_show_preread_threshold(struct mddev *mddev, char *page)
static ssize_t
raid5_store_preread_threshold(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf = mddev->private;
struct r5conf *conf;
unsigned long new;
int err;
if (len >= PAGE_SIZE)
return -EINVAL;
if (!conf)
return -ENODEV;
if (kstrtoul(page, 10, &new))
return -EINVAL;
if (new > conf->max_nr_stripes)
return -EINVAL;
err = mddev_lock(mddev);
if (err)
return err;
conf = mddev->private;
if (!conf)
err = -ENODEV;
else if (new > conf->max_nr_stripes)
err = -EINVAL;
else
conf->bypass_threshold = new;
return len;
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry
......@@ -5475,19 +5487,23 @@ raid5_show_skip_copy(struct mddev *mddev, char *page)
static ssize_t
raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf = mddev->private;
struct r5conf *conf;
unsigned long new;
int err;
if (len >= PAGE_SIZE)
return -EINVAL;
if (!conf)
return -ENODEV;
if (kstrtoul(page, 10, &new))
return -EINVAL;
new = !!new;
if (new == conf->skip_copy)
return len;
err = mddev_lock(mddev);
if (err)
return err;
conf = mddev->private;
if (!conf)
err = -ENODEV;
else if (new != conf->skip_copy) {
mddev_suspend(mddev);
conf->skip_copy = new;
if (new)
......@@ -5497,7 +5513,9 @@ raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len)
mddev->queue->backing_dev_info.capabilities &=
~BDI_CAP_STABLE_WRITES;
mddev_resume(mddev);
return len;
}
mddev_unlock(mddev);
return err ?: len;
}
static struct md_sysfs_entry
......@@ -5538,7 +5556,7 @@ static int alloc_thread_groups(struct r5conf *conf, int cnt,
static ssize_t
raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf = mddev->private;
struct r5conf *conf;
unsigned long new;
int err;
struct r5worker_group *new_groups, *old_groups;
......@@ -5546,15 +5564,16 @@ raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
if (len >= PAGE_SIZE)
return -EINVAL;
if (!conf)
return -ENODEV;
if (kstrtoul(page, 10, &new))
return -EINVAL;
if (new == conf->worker_cnt_per_group)
return len;
err = mddev_lock(mddev);
if (err)
return err;
conf = mddev->private;
if (!conf)
err = -ENODEV;
else if (new != conf->worker_cnt_per_group) {
mddev_suspend(mddev);
old_groups = conf->worker_groups;
......@@ -5575,12 +5594,11 @@ raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
kfree(old_groups[0].workers);
kfree(old_groups);
}
mddev_resume(mddev);
}
mddev_unlock(mddev);
if (err)
return err;
return len;
return err ?: len;
}
static struct md_sysfs_entry
......
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