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-rw-r--r--drivers/md/md.c816
1 files changed, 516 insertions, 300 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 709755fb6d7b..c8d2bac4e28b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -72,6 +72,7 @@ static struct workqueue_struct *md_misc_wq;
static int remove_and_add_spares(struct mddev *mddev,
struct md_rdev *this);
+static void mddev_detach(struct mddev *mddev);
/*
* Default number of read corrections we'll attempt on an rdev
@@ -292,8 +293,8 @@ static void md_make_request(struct request_queue *q, struct bio *bio)
/* 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.
+ * Once mddev_detach() is called and completes, the module will be
+ * completely unused.
*/
void mddev_suspend(struct mddev *mddev)
{
@@ -321,10 +322,47 @@ EXPORT_SYMBOL_GPL(mddev_resume);
int mddev_congested(struct mddev *mddev, int bits)
{
- return mddev->suspended;
+ struct md_personality *pers = mddev->pers;
+ int ret = 0;
+
+ rcu_read_lock();
+ if (mddev->suspended)
+ ret = 1;
+ else if (pers && pers->congested)
+ ret = pers->congested(mddev, bits);
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mddev_congested);
+static int md_congested(void *data, int bits)
+{
+ struct mddev *mddev = data;
+ return mddev_congested(mddev, bits);
}
-EXPORT_SYMBOL(mddev_congested);
+static int md_mergeable_bvec(struct request_queue *q,
+ struct bvec_merge_data *bvm,
+ struct bio_vec *biovec)
+{
+ struct mddev *mddev = q->queuedata;
+ int ret;
+ rcu_read_lock();
+ if (mddev->suspended) {
+ /* Must always allow one vec */
+ if (bvm->bi_size == 0)
+ ret = biovec->bv_len;
+ else
+ ret = 0;
+ } else {
+ struct md_personality *pers = mddev->pers;
+ if (pers && pers->mergeable_bvec)
+ ret = pers->mergeable_bvec(mddev, bvm, biovec);
+ else
+ ret = biovec->bv_len;
+ }
+ rcu_read_unlock();
+ return ret;
+}
/*
* Generic flush handling for md
*/
@@ -397,12 +435,12 @@ static void md_submit_flush_data(struct work_struct *ws)
void md_flush_request(struct mddev *mddev, struct bio *bio)
{
- spin_lock_irq(&mddev->write_lock);
+ spin_lock_irq(&mddev->lock);
wait_event_lock_irq(mddev->sb_wait,
!mddev->flush_bio,
- mddev->write_lock);
+ mddev->lock);
mddev->flush_bio = bio;
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock_irq(&mddev->lock);
INIT_WORK(&mddev->flush_work, submit_flushes);
queue_work(md_wq, &mddev->flush_work);
@@ -465,7 +503,7 @@ void mddev_init(struct mddev *mddev)
atomic_set(&mddev->active, 1);
atomic_set(&mddev->openers, 0);
atomic_set(&mddev->active_io, 0);
- spin_lock_init(&mddev->write_lock);
+ spin_lock_init(&mddev->lock);
atomic_set(&mddev->flush_pending, 0);
init_waitqueue_head(&mddev->sb_wait);
init_waitqueue_head(&mddev->recovery_wait);
@@ -552,32 +590,9 @@ static struct mddev *mddev_find(dev_t unit)
goto retry;
}
-static inline int __must_check mddev_lock(struct mddev *mddev)
-{
- return mutex_lock_interruptible(&mddev->reconfig_mutex);
-}
-
-/* Sometimes we need to take the lock in a situation where
- * failure due to interrupts is not acceptable.
- */
-static inline void mddev_lock_nointr(struct mddev *mddev)
-{
- mutex_lock(&mddev->reconfig_mutex);
-}
-
-static inline int mddev_is_locked(struct mddev *mddev)
-{
- return mutex_is_locked(&mddev->reconfig_mutex);
-}
-
-static inline int mddev_trylock(struct mddev *mddev)
-{
- return mutex_trylock(&mddev->reconfig_mutex);
-}
-
static struct attribute_group md_redundancy_group;
-static void mddev_unlock(struct mddev *mddev)
+void mddev_unlock(struct mddev *mddev)
{
if (mddev->to_remove) {
/* These cannot be removed under reconfig_mutex as
@@ -619,6 +634,7 @@ static void mddev_unlock(struct mddev *mddev)
md_wakeup_thread(mddev->thread);
spin_unlock(&pers_lock);
}
+EXPORT_SYMBOL_GPL(mddev_unlock);
static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
{
@@ -2230,7 +2246,7 @@ repeat:
return;
}
- spin_lock_irq(&mddev->write_lock);
+ spin_lock(&mddev->lock);
mddev->utime = get_seconds();
@@ -2287,7 +2303,7 @@ repeat:
}
sync_sbs(mddev, nospares);
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
mdname(mddev), mddev->in_sync);
@@ -2326,15 +2342,15 @@ repeat:
md_super_wait(mddev);
/* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
- spin_lock_irq(&mddev->write_lock);
+ spin_lock(&mddev->lock);
if (mddev->in_sync != sync_req ||
test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
/* have to write it out again */
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
goto repeat;
}
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
wake_up(&mddev->sb_wait);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
@@ -2381,40 +2397,41 @@ state_show(struct md_rdev *rdev, char *page)
{
char *sep = "";
size_t len = 0;
+ unsigned long flags = ACCESS_ONCE(rdev->flags);
- if (test_bit(Faulty, &rdev->flags) ||
+ if (test_bit(Faulty, &flags) ||
rdev->badblocks.unacked_exist) {
len+= sprintf(page+len, "%sfaulty",sep);
sep = ",";
}
- if (test_bit(In_sync, &rdev->flags)) {
+ if (test_bit(In_sync, &flags)) {
len += sprintf(page+len, "%sin_sync",sep);
sep = ",";
}
- if (test_bit(WriteMostly, &rdev->flags)) {
+ if (test_bit(WriteMostly, &flags)) {
len += sprintf(page+len, "%swrite_mostly",sep);
sep = ",";
}
- if (test_bit(Blocked, &rdev->flags) ||
+ if (test_bit(Blocked, &flags) ||
(rdev->badblocks.unacked_exist
- && !test_bit(Faulty, &rdev->flags))) {
+ && !test_bit(Faulty, &flags))) {
len += sprintf(page+len, "%sblocked", sep);
sep = ",";
}
- if (!test_bit(Faulty, &rdev->flags) &&
- !test_bit(In_sync, &rdev->flags)) {
+ if (!test_bit(Faulty, &flags) &&
+ !test_bit(In_sync, &flags)) {
len += sprintf(page+len, "%sspare", sep);
sep = ",";
}
- if (test_bit(WriteErrorSeen, &rdev->flags)) {
+ if (test_bit(WriteErrorSeen, &flags)) {
len += sprintf(page+len, "%swrite_error", sep);
sep = ",";
}
- if (test_bit(WantReplacement, &rdev->flags)) {
+ if (test_bit(WantReplacement, &flags)) {
len += sprintf(page+len, "%swant_replacement", sep);
sep = ",";
}
- if (test_bit(Replacement, &rdev->flags)) {
+ if (test_bit(Replacement, &flags)) {
len += sprintf(page+len, "%sreplacement", sep);
sep = ",";
}
@@ -2927,21 +2944,12 @@ rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
- struct mddev *mddev = rdev->mddev;
- ssize_t rv;
if (!entry->show)
return -EIO;
-
- rv = mddev ? mddev_lock(mddev) : -EBUSY;
- if (!rv) {
- if (rdev->mddev == NULL)
- rv = -EBUSY;
- else
- rv = entry->show(rdev, page);
- mddev_unlock(mddev);
- }
- return rv;
+ if (!rdev->mddev)
+ return -EBUSY;
+ return entry->show(rdev, page);
}
static ssize_t
@@ -3212,11 +3220,13 @@ safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
mddev->safemode_delay = 0;
else {
unsigned long old_delay = mddev->safemode_delay;
- mddev->safemode_delay = (msec*HZ)/1000;
- if (mddev->safemode_delay == 0)
- mddev->safemode_delay = 1;
- if (mddev->safemode_delay < old_delay || old_delay == 0)
- md_safemode_timeout((unsigned long)mddev);
+ unsigned long new_delay = (msec*HZ)/1000;
+
+ if (new_delay == 0)
+ new_delay = 1;
+ mddev->safemode_delay = new_delay;
+ if (new_delay < old_delay || old_delay == 0)
+ mod_timer(&mddev->safemode_timer, jiffies+1);
}
return len;
}
@@ -3226,41 +3236,52 @@ __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
static ssize_t
level_show(struct mddev *mddev, char *page)
{
- struct md_personality *p = mddev->pers;
+ struct md_personality *p;
+ int ret;
+ spin_lock(&mddev->lock);
+ p = mddev->pers;
if (p)
- return sprintf(page, "%s\n", p->name);
+ ret = sprintf(page, "%s\n", p->name);
else if (mddev->clevel[0])
- return sprintf(page, "%s\n", mddev->clevel);
+ ret = sprintf(page, "%s\n", mddev->clevel);
else if (mddev->level != LEVEL_NONE)
- return sprintf(page, "%d\n", mddev->level);
+ ret = sprintf(page, "%d\n", mddev->level);
else
- return 0;
+ ret = 0;
+ spin_unlock(&mddev->lock);
+ return ret;
}
static ssize_t
level_store(struct mddev *mddev, const char *buf, size_t len)
{
char clevel[16];
- ssize_t rv = len;
- struct md_personality *pers;
+ ssize_t rv;
+ size_t slen = len;
+ struct md_personality *pers, *oldpers;
long level;
- void *priv;
+ 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
@@ -3268,25 +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;
@@ -3297,20 +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)
@@ -3330,30 +3354,29 @@ 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 */
mddev_suspend(mddev);
- mddev->pers->stop(mddev);
+ mddev_detach(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, "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;
- }
+ spin_lock(&mddev->lock);
+ oldpers = mddev->pers;
+ oldpriv = mddev->private;
+ mddev->pers = pers;
+ mddev->private = priv;
+ strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
+ mddev->level = mddev->new_level;
+ mddev->layout = mddev->new_layout;
+ mddev->chunk_sectors = mddev->new_chunk_sectors;
+ mddev->delta_disks = 0;
+ mddev->reshape_backwards = 0;
+ mddev->degraded = 0;
+ spin_unlock(&mddev->lock);
- if (mddev->pers->sync_request == NULL &&
+ if (oldpers->sync_request == NULL &&
mddev->external) {
/* We are converting from a no-redundancy array
* to a redundancy array and metadata is managed
@@ -3367,6 +3390,24 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
mddev->safemode = 0;
}
+ oldpers->free(mddev, oldpriv);
+
+ if (oldpers->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, "sync_action");
+ }
+ if (oldpers->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;
+ }
+
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk < 0)
continue;
@@ -3392,17 +3433,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
}
}
- module_put(mddev->pers->owner);
- mddev->pers = pers;
- mddev->private = priv;
- strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
- mddev->level = mddev->new_level;
- mddev->layout = mddev->new_layout;
- mddev->chunk_sectors = mddev->new_chunk_sectors;
- mddev->delta_disks = 0;
- mddev->reshape_backwards = 0;
- mddev->degraded = 0;
- if (mddev->pers->sync_request == NULL) {
+ if (pers->sync_request == NULL) {
/* this is now an array without redundancy, so
* it must always be in_sync
*/
@@ -3417,6 +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;
}
@@ -3439,28 +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;
- mddev->new_layout = n;
- err = mddev->pers->check_reshape(mddev);
- if (err) {
- mddev->new_layout = mddev->layout;
- return err;
+ err = -EBUSY;
+ else if (mddev->ro)
+ err = -EROFS;
+ else {
+ mddev->new_layout = n;
+ err = mddev->pers->check_reshape(mddev);
+ if (err)
+ mddev->new_layout = mddev->layout;
}
} 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);
@@ -3483,32 +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);
@@ -3527,30 +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;
- mddev->new_chunk_sectors = n >> 9;
- err = mddev->pers->check_reshape(mddev);
- if (err) {
- mddev->new_chunk_sectors = mddev->chunk_sectors;
- return err;
+ err = -EBUSY;
+ else if (mddev->ro)
+ err = -EROFS;
+ else {
+ mddev->new_chunk_sectors = n >> 9;
+ err = mddev->pers->check_reshape(mddev);
+ if (err)
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
}
} 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);
@@ -3566,20 +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;
- mddev->recovery_cp = n;
- if (mddev->pers)
- set_bit(MD_CHANGE_CLEAN, &mddev->flags);
- return len;
+ if (!err) {
+ mddev->recovery_cp = n;
+ if (mddev->pers)
+ set_bit(MD_CHANGE_CLEAN, &mddev->flags);
+ }
+ 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);
@@ -3677,8 +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;
@@ -3722,7 +3809,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
case clean:
if (mddev->pers) {
restart_array(mddev);
- spin_lock_irq(&mddev->write_lock);
+ spin_lock(&mddev->lock);
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
@@ -3733,7 +3820,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
err = 0;
} else
err = -EBUSY;
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
} else
err = -EINVAL;
break;
@@ -3754,14 +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);
@@ -3822,6 +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);
@@ -3845,6 +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;
}
@@ -3856,7 +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) */
@@ -3874,6 +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;
}
@@ -3901,6 +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);
@@ -3911,6 +4012,7 @@ size_store(struct mddev *mddev, const char *buf, size_t len)
else
err = -ENOSPC;
}
+ mddev_unlock(mddev);
return err ? err : len;
}
@@ -3940,21 +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;
@@ -3968,22 +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 =
@@ -3993,20 +4107,21 @@ static ssize_t
action_show(struct mddev *mddev, char *page)
{
char *type = "idle";
- if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
+ unsigned long recovery = mddev->recovery;
+ if (test_bit(MD_RECOVERY_FROZEN, &recovery))
type = "frozen";
- else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
- (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
- if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
+ else if (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
+ (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) {
+ if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
type = "reshape";
- else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
- if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+ else if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
+ if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
type = "resync";
- else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+ else if (test_bit(MD_RECOVERY_CHECK, &recovery))
type = "check";
else
type = "repair";
- } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
+ } else if (test_bit(MD_RECOVERY_RECOVER, &recovery))
type = "recover";
}
return sprintf(page, "%s\n", type);
@@ -4027,7 +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);
- md_reap_sync_thread(mddev);
+ 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))
@@ -4041,7 +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->pers->start_reshape(mddev);
+ 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");
@@ -4225,22 +4347,36 @@ static ssize_t
min_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long min;
+ int err;
+ int chunk;
+
if (kstrtoull(buf, 10, &min))
return -EINVAL;
+
+ spin_lock(&mddev->lock);
+ err = -EINVAL;
if (min > mddev->resync_max)
- return -EINVAL;
+ goto out_unlock;
+
+ err = -EBUSY;
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
- return -EBUSY;
+ goto out_unlock;
/* Must be a multiple of chunk_size */
- if (mddev->chunk_sectors) {
+ chunk = mddev->chunk_sectors;
+ if (chunk) {
sector_t temp = min;
- if (sector_div(temp, mddev->chunk_sectors))
- return -EINVAL;
+
+ err = -EINVAL;
+ if (sector_div(temp, chunk))
+ goto out_unlock;
}
mddev->resync_min = min;
+ err = 0;
- return len;
+out_unlock:
+ spin_unlock(&mddev->lock);
+ return err ?: len;
}
static struct md_sysfs_entry md_min_sync =
@@ -4258,29 +4394,42 @@ max_sync_show(struct mddev *mddev, char *page)
static ssize_t
max_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
+ int err;
+ spin_lock(&mddev->lock);
if (strncmp(buf, "max", 3) == 0)
mddev->resync_max = MaxSector;
else {
unsigned long long max;
+ int chunk;
+
+ err = -EINVAL;
if (kstrtoull(buf, 10, &max))
- return -EINVAL;
+ goto out_unlock;
if (max < mddev->resync_min)
- return -EINVAL;
+ goto out_unlock;
+
+ err = -EBUSY;
if (max < mddev->resync_max &&
mddev->ro == 0 &&
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
- return -EBUSY;
+ goto out_unlock;
/* Must be a multiple of chunk_size */
- if (mddev->chunk_sectors) {
+ chunk = mddev->chunk_sectors;
+ if (chunk) {
sector_t temp = max;
- if (sector_div(temp, mddev->chunk_sectors))
- return -EINVAL;
+
+ err = -EINVAL;
+ if (sector_div(temp, chunk))
+ goto out_unlock;
}
mddev->resync_max = max;
}
wake_up(&mddev->recovery_wait);
- return len;
+ err = 0;
+out_unlock:
+ spin_unlock(&mddev->lock);
+ return err ?: len;
}
static struct md_sysfs_entry md_max_sync =
@@ -4297,14 +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 */
@@ -4314,7 +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);
@@ -4330,14 +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 */
@@ -4347,7 +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);
@@ -4367,11 +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;
@@ -4380,7 +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 =
@@ -4398,6 +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"))
@@ -4407,16 +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;
-
- mddev->reshape_backwards = backwards;
- return len;
+ err = -EINVAL;
+ else
+ mddev->reshape_backwards = backwards;
+ mddev_unlock(mddev);
+ return err ?: len;
}
static struct md_sysfs_entry md_reshape_direction =
@@ -4437,6 +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)
@@ -4447,19 +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;
-
- mddev->external_size = 1;
+ err = -EINVAL;
+ else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
+ err = -E2BIG;
+ else
+ mddev->external_size = 1;
}
- mddev->array_sectors = sectors;
- if (mddev->pers) {
- set_capacity(mddev->gendisk, mddev->array_sectors);
- revalidate_disk(mddev->gendisk);
+ 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 =
@@ -4523,11 +4712,7 @@ md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
mddev_get(mddev);
spin_unlock(&all_mddevs_lock);
- rv = mddev_lock(mddev);
- if (!rv) {
- rv = entry->show(mddev, page);
- mddev_unlock(mddev);
- }
+ rv = entry->show(mddev, page);
mddev_put(mddev);
return rv;
}
@@ -4551,13 +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);
- }
+ rv = entry->store(mddev, page, length);
mddev_put(mddev);
return rv;
}
@@ -4825,7 +5004,6 @@ int md_run(struct mddev *mddev)
mddev->clevel);
return -EINVAL;
}
- mddev->pers = pers;
spin_unlock(&pers_lock);
if (mddev->level != pers->level) {
mddev->level = pers->level;
@@ -4836,7 +5014,6 @@ int md_run(struct mddev *mddev)
if (mddev->reshape_position != MaxSector &&
pers->start_reshape == NULL) {
/* This personality cannot handle reshaping... */
- mddev->pers = NULL;
module_put(pers->owner);
return -EINVAL;
}
@@ -4880,35 +5057,38 @@ int md_run(struct mddev *mddev)
if (start_readonly && mddev->ro == 0)
mddev->ro = 2; /* read-only, but switch on first write */
- err = mddev->pers->run(mddev);
+ err = pers->run(mddev);
if (err)
printk(KERN_ERR "md: pers->run() failed ...\n");
- else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
+ else if (pers->size(mddev, 0, 0) < mddev->array_sectors) {
WARN_ONCE(!mddev->external_size, "%s: default size too small,"
" but 'external_size' not in effect?\n", __func__);
printk(KERN_ERR
"md: invalid array_size %llu > default size %llu\n",
(unsigned long long)mddev->array_sectors / 2,
- (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
+ (unsigned long long)pers->size(mddev, 0, 0) / 2);
err = -EINVAL;
- mddev->pers->stop(mddev);
}
- if (err == 0 && mddev->pers->sync_request &&
+ if (err == 0 && pers->sync_request &&
(mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
err = bitmap_create(mddev);
- if (err) {
+ if (err)
printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
mdname(mddev), err);
- mddev->pers->stop(mddev);
- }
}
if (err) {
- module_put(mddev->pers->owner);
- mddev->pers = NULL;
+ mddev_detach(mddev);
+ pers->free(mddev, mddev->private);
+ module_put(pers->owner);
bitmap_destroy(mddev);
return err;
}
- if (mddev->pers->sync_request) {
+ if (mddev->queue) {
+ mddev->queue->backing_dev_info.congested_data = mddev;
+ mddev->queue->backing_dev_info.congested_fn = md_congested;
+ blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec);
+ }
+ if (pers->sync_request) {
if (mddev->kobj.sd &&
sysfs_create_group(&mddev->kobj, &md_redundancy_group))
printk(KERN_WARNING
@@ -4927,7 +5107,10 @@ int md_run(struct mddev *mddev)
mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
mddev->in_sync = 1;
smp_wmb();
+ spin_lock(&mddev->lock);
+ mddev->pers = pers;
mddev->ready = 1;
+ spin_unlock(&mddev->lock);
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0)
if (sysfs_link_rdev(mddev, rdev))
@@ -5070,14 +5253,38 @@ void md_stop_writes(struct mddev *mddev)
}
EXPORT_SYMBOL_GPL(md_stop_writes);
+static void mddev_detach(struct mddev *mddev)
+{
+ struct bitmap *bitmap = mddev->bitmap;
+ /* wait for behind writes to complete */
+ if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
+ printk(KERN_INFO "md:%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);
+ }
+ if (mddev->pers && mddev->pers->quiesce) {
+ mddev->pers->quiesce(mddev, 1);
+ mddev->pers->quiesce(mddev, 0);
+ }
+ md_unregister_thread(&mddev->thread);
+ if (mddev->queue)
+ blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
+}
+
static void __md_stop(struct mddev *mddev)
{
+ struct md_personality *pers = mddev->pers;
+ mddev_detach(mddev);
+ spin_lock(&mddev->lock);
mddev->ready = 0;
- 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;
+ spin_unlock(&mddev->lock);
+ pers->free(mddev, mddev->private);
+ if (pers->sync_request && mddev->to_remove == NULL)
+ mddev->to_remove = &md_redundancy_group;
+ module_put(pers->owner);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
}
@@ -5226,8 +5433,11 @@ static int do_md_stop(struct mddev *mddev, int mode,
bitmap_destroy(mddev);
if (mddev->bitmap_info.file) {
- fput(mddev->bitmap_info.file);
+ struct file *f = mddev->bitmap_info.file;
+ spin_lock(&mddev->lock);
mddev->bitmap_info.file = NULL;
+ spin_unlock(&mddev->lock);
+ fput(f);
}
mddev->bitmap_info.offset = 0;
@@ -5436,37 +5646,31 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
static int get_bitmap_file(struct mddev *mddev, void __user * arg)
{
mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
- char *ptr, *buf = NULL;
- int err = -ENOMEM;
+ char *ptr;
+ int err;
file = kmalloc(sizeof(*file), GFP_NOIO);
-
if (!file)
- goto out;
+ return -ENOMEM;
+ err = 0;
+ spin_lock(&mddev->lock);
/* bitmap disabled, zero the first byte and copy out */
- if (!mddev->bitmap || !mddev->bitmap->storage.file) {
+ if (!mddev->bitmap_info.file)
file->pathname[0] = '\0';
- goto copy_out;
- }
-
- buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
- if (!buf)
- goto out;
-
- ptr = d_path(&mddev->bitmap->storage.file->f_path,
- buf, sizeof(file->pathname));
- if (IS_ERR(ptr))
- goto out;
-
- strcpy(file->pathname, ptr);
+ else if ((ptr = d_path(&mddev->bitmap_info.file->f_path,
+ file->pathname, sizeof(file->pathname))),
+ IS_ERR(ptr))
+ err = PTR_ERR(ptr);
+ else
+ memmove(file->pathname, ptr,
+ sizeof(file->pathname)-(ptr-file->pathname));
+ spin_unlock(&mddev->lock);
-copy_out:
- err = 0;
- if (copy_to_user(arg, file, sizeof(*file)))
+ if (err == 0 &&
+ copy_to_user(arg, file, sizeof(*file)))
err = -EFAULT;
-out:
- kfree(buf);
+
kfree(file);
return err;
}
@@ -5789,22 +5993,24 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
if (fd >= 0) {
struct inode *inode;
- if (mddev->bitmap)
+ struct file *f;
+
+ if (mddev->bitmap || mddev->bitmap_info.file)
return -EEXIST; /* cannot add when bitmap is present */
- mddev->bitmap_info.file = fget(fd);
+ f = fget(fd);
- if (mddev->bitmap_info.file == NULL) {
+ if (f == NULL) {
printk(KERN_ERR "%s: error: failed to get bitmap file\n",
mdname(mddev));
return -EBADF;
}
- inode = mddev->bitmap_info.file->f_mapping->host;
+ inode = f->f_mapping->host;
if (!S_ISREG(inode->i_mode)) {
printk(KERN_ERR "%s: error: bitmap file must be a regular file\n",
mdname(mddev));
err = -EBADF;
- } else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) {
+ } else if (!(f->f_mode & FMODE_WRITE)) {
printk(KERN_ERR "%s: error: bitmap file must open for write\n",
mdname(mddev));
err = -EBADF;
@@ -5814,10 +6020,10 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
err = -EBUSY;
}
if (err) {
- fput(mddev->bitmap_info.file);
- mddev->bitmap_info.file = NULL;
+ fput(f);
return err;
}
+ mddev->bitmap_info.file = f;
mddev->bitmap_info.offset = 0; /* file overrides offset */
} else if (mddev->bitmap == NULL)
return -ENOENT; /* cannot remove what isn't there */
@@ -5836,9 +6042,13 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
mddev->pers->quiesce(mddev, 0);
}
if (fd < 0) {
- if (mddev->bitmap_info.file)
- fput(mddev->bitmap_info.file);
- mddev->bitmap_info.file = NULL;
+ struct file *f = mddev->bitmap_info.file;
+ if (f) {
+ spin_lock(&mddev->lock);
+ mddev->bitmap_info.file = NULL;
+ spin_unlock(&mddev->lock);
+ fput(f);
+ }
}
return err;
@@ -6251,6 +6461,11 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
case SET_DISK_FAULTY:
err = set_disk_faulty(mddev, new_decode_dev(arg));
goto out;
+
+ case GET_BITMAP_FILE:
+ err = get_bitmap_file(mddev, argp);
+ goto out;
+
}
if (cmd == ADD_NEW_DISK)
@@ -6342,10 +6557,6 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
* Commands even a read-only array can execute:
*/
switch (cmd) {
- case GET_BITMAP_FILE:
- err = get_bitmap_file(mddev, argp);
- goto unlock;
-
case RESTART_ARRAY_RW:
err = restart_array(mddev);
goto unlock;
@@ -6873,9 +7084,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
return 0;
}
- if (mddev_lock(mddev) < 0)
- return -EINTR;
-
+ spin_lock(&mddev->lock);
if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
seq_printf(seq, "%s : %sactive", mdname(mddev),
mddev->pers ? "" : "in");
@@ -6888,7 +7097,8 @@ static int md_seq_show(struct seq_file *seq, void *v)
}
sectors = 0;
- rdev_for_each(rdev, mddev) {
+ rcu_read_lock();
+ rdev_for_each_rcu(rdev, mddev) {
char b[BDEVNAME_SIZE];
seq_printf(seq, " %s[%d]",
bdevname(rdev->bdev,b), rdev->desc_nr);
@@ -6904,6 +7114,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "(R)");
sectors += rdev->sectors;
}
+ rcu_read_unlock();
if (!list_empty(&mddev->disks)) {
if (mddev->pers)
@@ -6946,7 +7157,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "\n");
}
- mddev_unlock(mddev);
+ spin_unlock(&mddev->lock);
return 0;
}
@@ -7102,7 +7313,7 @@ void md_write_start(struct mddev *mddev, struct bio *bi)
if (mddev->safemode == 1)
mddev->safemode = 0;
if (mddev->in_sync) {
- spin_lock_irq(&mddev->write_lock);
+ spin_lock(&mddev->lock);
if (mddev->in_sync) {
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
@@ -7110,7 +7321,7 @@ void md_write_start(struct mddev *mddev, struct bio *bi)
md_wakeup_thread(mddev->thread);
did_change = 1;
}
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
}
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
@@ -7148,7 +7359,7 @@ int md_allow_write(struct mddev *mddev)
if (!mddev->pers->sync_request)
return 0;
- spin_lock_irq(&mddev->write_lock);
+ spin_lock(&mddev->lock);
if (mddev->in_sync) {
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
@@ -7156,11 +7367,11 @@ int md_allow_write(struct mddev *mddev)
if (mddev->safemode_delay &&
mddev->safemode == 0)
mddev->safemode = 1;
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
md_update_sb(mddev, 0);
sysfs_notify_dirent_safe(mddev->sysfs_state);
} else
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
return -EAGAIN;
@@ -7513,6 +7724,7 @@ void md_do_sync(struct md_thread *thread)
skip:
set_bit(MD_CHANGE_DEVS, &mddev->flags);
+ spin_lock(&mddev->lock);
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
/* We completed so min/max setting can be forgotten if used. */
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
@@ -7521,6 +7733,8 @@ void md_do_sync(struct md_thread *thread)
} else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
mddev->resync_min = mddev->curr_resync_completed;
mddev->curr_resync = 0;
+ spin_unlock(&mddev->lock);
+
wake_up(&resync_wait);
set_bit(MD_RECOVERY_DONE, &mddev->recovery);
md_wakeup_thread(mddev->thread);
@@ -7688,7 +7902,7 @@ void md_check_recovery(struct mddev *mddev)
if (!mddev->external) {
int did_change = 0;
- spin_lock_irq(&mddev->write_lock);
+ spin_lock(&mddev->lock);
if (mddev->safemode &&
!atomic_read(&mddev->writes_pending) &&
!mddev->in_sync &&
@@ -7699,7 +7913,7 @@ void md_check_recovery(struct mddev *mddev)
}
if (mddev->safemode == 1)
mddev->safemode = 0;
- spin_unlock_irq(&mddev->write_lock);
+ spin_unlock(&mddev->lock);
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
@@ -7721,7 +7935,9 @@ void md_check_recovery(struct mddev *mddev)
* any transients in the value of "sync_action".
*/
mddev->curr_resync_completed = 0;
+ spin_lock(&mddev->lock);
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+ spin_unlock(&mddev->lock);
/* Clear some bits that don't mean anything, but
* might be left set
*/
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.