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md updates for 4.5

Browse source 
Mostly clustered-raid1 and raid5 journal updates.
 one Y2038 fix and other minor stuff.
 
 One patch removes me from the MAINTAINERS file and adds a record of
 my md maintainership to Credits.
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Merge tag 'md/4.5' of git://neil.brown.name/md

Pull md updates from Neil Brown:
 "Mostly clustered-raid1 and raid5 journal updates.  one Y2038 fix and
  other minor stuff.

  One patch removes me from the MAINTAINERS file and adds a record of my
  md maintainership to Credits"

Many thanks to Neil, who has been around for a _looong_ time.

* tag 'md/4.5' of git://neil.brown.name/md: (26 commits)
  md/raid: only permit hot-add of compatible integrity profiles
  Remove myself as MD Maintainer, and add to Credits.
  raid5-cache: handle journal hotadd in quiesce
  MD: add journal with array suspended
  md: set MD_HAS_JOURNAL in correct places
  md: Remove 'ready' field from mddev.
  md: remove unnecesary md_new_event_inintr
  raid5: allow r5l_io_unit allocations to fail
  raid5-cache: use a mempool for the metadata block
  raid5-cache: use a bio_set
  raid5-cache: add journal hot add/remove support
  drivers: md: use ktime_get_real_seconds()
  md: avoid warning for 32-bit sector_t
  raid5-cache: free meta_page earlier
  raid5-cache: simplify r5l_move_io_unit_list
  md: update comment for md_allow_write
  md-cluster: update comments for MD_CLUSTER_SEND_LOCKED_ALREADY
  md-cluster: Protect communication with mutexes
  md-cluster: Defer MD reloading to mddev->thread
  md-cluster: update the documentation
  ...
This commit is contained in:
Linus Torvalds 2016-01-15 12:28:00 -08:00
commit 3c28c9ccaf
13 changed files with 649 additions and 231 deletions
Download patch file Download diff file Expand all files Collapse all files

164
drivers/md/md-cluster.c
View file

@ -48,13 +48,29 @@ struct resync_info {
#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
/* Lock the send communication. This is done through
* bit manipulation as opposed to a mutex in order to
* accomodate lock and hold. See next comment.
*/
#define MD_CLUSTER_SEND_LOCK 4
/* If cluster operations (such as adding a disk) must lock the
* communication channel, so as to perform extra operations
* (update metadata) and no other operation is allowed on the
* MD. Token needs to be locked and held until the operation
* completes witha md_update_sb(), which would eventually release
* the lock.
*/
#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
struct md_cluster_info {
/* dlm lock space and resources for clustered raid. */
dlm_lockspace_t *lockspace;
int slot_number;
struct completion completion;
struct mutex recv_mutex;
struct dlm_lock_resource *bitmap_lockres;
struct dlm_lock_resource **other_bitmap_lockres;
struct dlm_lock_resource *resync_lockres;
struct list_head suspend_list;
spinlock_t suspend_lock;
@ -67,6 +83,7 @@ struct md_cluster_info {
struct dlm_lock_resource *no_new_dev_lockres;
struct md_thread *recv_thread;
struct completion newdisk_completion;
wait_queue_head_t wait;
unsigned long state;
};
@ -431,8 +448,10 @@ static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
md_reload_sb(mddev, le32_to_cpu(msg->raid_slot));
mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
set_bit(MD_RELOAD_SB, &mddev->flags);
dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
md_wakeup_thread(mddev->thread);
}
static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
@ -440,8 +459,11 @@ static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
le32_to_cpu(msg->raid_slot));
if (rdev)
md_kick_rdev_from_array(rdev);
if (rdev) {
set_bit(ClusterRemove, &rdev->flags);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
}
else
pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
__func__, __LINE__, le32_to_cpu(msg->raid_slot));
@ -502,9 +524,11 @@ static void recv_daemon(struct md_thread *thread)
struct cluster_msg msg;
int ret;
mutex_lock(&cinfo->recv_mutex);
/*get CR on Message*/
if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
pr_err("md/raid1:failed to get CR on MESSAGE\n");
mutex_unlock(&cinfo->recv_mutex);
return;
}
@ -528,33 +552,45 @@ static void recv_daemon(struct md_thread *thread)
ret = dlm_unlock_sync(message_lockres);
if (unlikely(ret != 0))
pr_info("unlock msg failed return %d\n", ret);
mutex_unlock(&cinfo->recv_mutex);
}
/* lock_comm()
/* lock_token()
* Takes the lock on the TOKEN lock resource so no other
* node can communicate while the operation is underway.
* If called again, and the TOKEN lock is alread in EX mode
* return success. However, care must be taken that unlock_comm()
* is called only once.
*/
static int lock_comm(struct md_cluster_info *cinfo)
static int lock_token(struct md_cluster_info *cinfo)
{
int error;
if (cinfo->token_lockres->mode == DLM_LOCK_EX)
return 0;
error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
if (error)
pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
__func__, __LINE__, error);
/* Lock the receive sequence */
mutex_lock(&cinfo->recv_mutex);
return error;
}
/* lock_comm()
* Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
*/
static int lock_comm(struct md_cluster_info *cinfo)
{
wait_event(cinfo->wait,
!test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
return lock_token(cinfo);
}
static void unlock_comm(struct md_cluster_info *cinfo)
{
WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
mutex_unlock(&cinfo->recv_mutex);
dlm_unlock_sync(cinfo->token_lockres);
clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
wake_up(&cinfo->wait);
}
/* __sendmsg()
@ -707,6 +743,8 @@ static int join(struct mddev *mddev, int nodes)
spin_lock_init(&cinfo->suspend_lock);
init_completion(&cinfo->completion);
set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
init_waitqueue_head(&cinfo->wait);
mutex_init(&cinfo->recv_mutex);
mddev->cluster_info = cinfo;
@ -800,6 +838,7 @@ static void resync_bitmap(struct mddev *mddev)
__func__, __LINE__, err);
}
static void unlock_all_bitmaps(struct mddev *mddev);
static int leave(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
@ -820,6 +859,7 @@ static int leave(struct mddev *mddev)
lockres_free(cinfo->ack_lockres);
lockres_free(cinfo->no_new_dev_lockres);
lockres_free(cinfo->bitmap_lockres);
unlock_all_bitmaps(mddev);
dlm_release_lockspace(cinfo->lockspace, 2);
return 0;
}
@ -835,9 +875,25 @@ static int slot_number(struct mddev *mddev)
return cinfo->slot_number - 1;
}
/*
* Check if the communication is already locked, else lock the communication
* channel.
* If it is already locked, token is in EX mode, and hence lock_token()
* should not be called.
*/
static int metadata_update_start(struct mddev *mddev)
{
return lock_comm(mddev->cluster_info);
struct md_cluster_info *cinfo = mddev->cluster_info;
wait_event(cinfo->wait,
!test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
/* If token is already locked, return 0 */
if (cinfo->token_lockres->mode == DLM_LOCK_EX)
return 0;
return lock_token(cinfo);
}
static int metadata_update_finish(struct mddev *mddev)
@ -862,6 +918,7 @@ static int metadata_update_finish(struct mddev *mddev)
ret = __sendmsg(cinfo, &cmsg);
} else
pr_warn("md-cluster: No good device id found to send\n");
clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
unlock_comm(cinfo);
return ret;
}
@ -869,6 +926,7 @@ static int metadata_update_finish(struct mddev *mddev)
static void metadata_update_cancel(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
unlock_comm(cinfo);
}
@ -882,8 +940,16 @@ static int resync_start(struct mddev *mddev)
static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
struct resync_info ri;
struct cluster_msg cmsg = {0};
/* do not send zero again, if we have sent before */
if (hi == 0) {
memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
if (le64_to_cpu(ri.hi) == 0)
return 0;
}
add_resync_info(cinfo->bitmap_lockres, lo, hi);
/* Re-acquire the lock to refresh LVB */
dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
@ -954,14 +1020,30 @@ static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
ret = -ENOENT;
if (ret)
unlock_comm(cinfo);
else
else {
dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
/* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
* will run soon after add_new_disk, the below path will be
* invoked:
* md_wakeup_thread(mddev->thread)
* -> conf->thread (raid1d)
* -> md_check_recovery -> md_update_sb
* -> metadata_update_start/finish
* MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
*
* For other failure cases, metadata_update_cancel and
* add_new_disk_cancel also clear below bit as well.
* */
set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
wake_up(&cinfo->wait);
}
return ret;
}
static void add_new_disk_cancel(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
unlock_comm(cinfo);
}
@ -986,7 +1068,59 @@ static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
struct md_cluster_info *cinfo = mddev->cluster_info;
cmsg.type = cpu_to_le32(REMOVE);
cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
return __sendmsg(cinfo, &cmsg);
return sendmsg(cinfo, &cmsg);
}
static int lock_all_bitmaps(struct mddev *mddev)
{
int slot, my_slot, ret, held = 1, i = 0;
char str[64];
struct md_cluster_info *cinfo = mddev->cluster_info;
cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) *
sizeof(struct dlm_lock_resource *),
GFP_KERNEL);
if (!cinfo->other_bitmap_lockres) {
pr_err("md: can't alloc mem for other bitmap locks\n");
return 0;
}
my_slot = slot_number(mddev);
for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
if (slot == my_slot)
continue;
memset(str, '\0', 64);
snprintf(str, 64, "bitmap%04d", slot);
cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
if (!cinfo->other_bitmap_lockres[i])
return -ENOMEM;
cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
if (ret)
held = -1;
i++;
}
return held;
}
static void unlock_all_bitmaps(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
int i;
/* release other node's bitmap lock if they are existed */
if (cinfo->other_bitmap_lockres) {
for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
if (cinfo->other_bitmap_lockres[i]) {
dlm_unlock_sync(cinfo->other_bitmap_lockres[i]);
lockres_free(cinfo->other_bitmap_lockres[i]);
}
}
kfree(cinfo->other_bitmap_lockres);
}
}
static int gather_bitmaps(struct md_rdev *rdev)
@ -1034,6 +1168,8 @@ static struct md_cluster_operations cluster_ops = {
.new_disk_ack = new_disk_ack,
.remove_disk = remove_disk,
.gather_bitmaps = gather_bitmaps,
.lock_all_bitmaps = lock_all_bitmaps,
.unlock_all_bitmaps = unlock_all_bitmaps,
};
static int __init cluster_init(void)

2
drivers/md/md-cluster.h
View file

@ -24,6 +24,8 @@ struct md_cluster_operations {
int (*new_disk_ack)(struct mddev *mddev, bool ack);
int (*remove_disk)(struct mddev *mddev, struct md_rdev *rdev);
int (*gather_bitmaps)(struct md_rdev *rdev);
int (*lock_all_bitmaps)(struct mddev *mddev);
void (*unlock_all_bitmaps)(struct mddev *mddev);
};
#endif /* _MD_CLUSTER_H */

171
drivers/md/md.c
View file

@ -206,15 +206,6 @@ void md_new_event(struct mddev *mddev)
}
EXPORT_SYMBOL_GPL(md_new_event);
/* Alternate version that can be called from interrupts
* when calling sysfs_notify isn't needed.
*/
static void md_new_event_inintr(struct mddev *mddev)
{
atomic_inc(&md_event_count);
wake_up(&md_event_waiters);
}
/*
* Enables to iterate over all existing md arrays
* all_mddevs_lock protects this list.
@ -260,8 +251,7 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
blk_queue_split(q, &bio, q->bio_split);
if (mddev == NULL || mddev->pers == NULL
|| !mddev->ready) {
if (mddev == NULL || mddev->pers == NULL) {
bio_io_error(bio);
return BLK_QC_T_NONE;
}
@ -1026,8 +1016,9 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor
* (not needed for Linear and RAID0 as metadata doesn't
* record this size)
*/
if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
rdev->sectors = (2ULL << 32) - 2;
if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) &&
sb->level >= 1)
rdev->sectors = (sector_t)(2ULL << 32) - 2;
if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
/* "this cannot possibly happen" ... */
@ -1199,13 +1190,13 @@ static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
memcpy(&sb->set_uuid3, mddev->uuid+12,4);
sb->ctime = mddev->ctime;
sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
sb->level = mddev->level;
sb->size = mddev->dev_sectors / 2;
sb->raid_disks = mddev->raid_disks;
sb->md_minor = mddev->md_minor;
sb->not_persistent = 0;
sb->utime = mddev->utime;
sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
sb->state = 0;
sb->events_hi = (mddev->events>>32);
sb->events_lo = (u32)mddev->events;
@ -1320,8 +1311,9 @@ super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
/* Limit to 4TB as metadata cannot record more than that.
* 4TB == 2^32 KB, or 2*2^32 sectors.
*/
if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
num_sectors = (2ULL << 32) - 2;
if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) &&
rdev->mddev->level >= 1)
num_sectors = (sector_t)(2ULL << 32) - 2;
md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
rdev->sb_page);
md_super_wait(rdev->mddev);
@ -1542,8 +1534,8 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->patch_version = 0;
mddev->external = 0;
mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
mddev->ctime = le64_to_cpu(sb->ctime);
mddev->utime = le64_to_cpu(sb->utime);
mddev->level = le32_to_cpu(sb->level);
mddev->clevel[0] = 0;
mddev->layout = le32_to_cpu(sb->layout);
@ -1602,6 +1594,11 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) {
set_bit(MD_HAS_JOURNAL, &mddev->flags);
if (mddev->recovery_cp == MaxSector)
set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
}
} else if (mddev->pers == NULL) {
/* Insist of good event counter while assembling, except for
* spares (which don't need an event count) */
@ -1648,8 +1645,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
}
set_bit(Journal, &rdev->flags);
rdev->journal_tail = le64_to_cpu(sb->journal_tail);
if (mddev->recovery_cp == MaxSector)
set_bit(MD_JOURNAL_CLEAN, &mddev->flags);
rdev->raid_disk = 0;
break;
default:
@ -1669,8 +1664,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
set_bit(WriteMostly, &rdev->flags);
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
set_bit(Replacement, &rdev->flags);
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
set_bit(MD_HAS_JOURNAL, &mddev->flags);
} else /* MULTIPATH are always insync */
set_bit(In_sync, &rdev->flags);
@ -2014,28 +2007,32 @@ int md_integrity_register(struct mddev *mddev)
}
EXPORT_SYMBOL(md_integrity_register);
/* Disable data integrity if non-capable/non-matching disk is being added */
void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
/*
* Attempt to add an rdev, but only if it is consistent with the current
* integrity profile
*/
int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
struct blk_integrity *bi_rdev;
struct blk_integrity *bi_mddev;
char name[BDEVNAME_SIZE];
if (!mddev->gendisk)
return;
return 0;
bi_rdev = bdev_get_integrity(rdev->bdev);
bi_mddev = blk_get_integrity(mddev->gendisk);
if (!bi_mddev) /* nothing to do */
return;
if (rdev->raid_disk < 0) /* skip spares */
return;
if (bi_rdev && blk_integrity_compare(mddev->gendisk,
rdev->bdev->bd_disk) >= 0)
return;
WARN_ON_ONCE(!mddev->suspended);
printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
blk_integrity_unregister(mddev->gendisk);
return 0;
if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) {
printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n",
mdname(mddev), bdevname(rdev->bdev, name));
return -ENXIO;
}
return 0;
}
EXPORT_SYMBOL(md_integrity_add_rdev);
@ -2050,8 +2047,9 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
return -EEXIST;
/* make sure rdev->sectors exceeds mddev->dev_sectors */
if (rdev->sectors && (mddev->dev_sectors == 0 ||
rdev->sectors < mddev->dev_sectors)) {
if (!test_bit(Journal, &rdev->flags) &&
rdev->sectors &&
(mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) {
if (mddev->pers) {
/* Cannot change size, so fail
* If mddev->level <= 0, then we don't care
@ -2082,7 +2080,8 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
}
}
rcu_read_unlock();
if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
if (!test_bit(Journal, &rdev->flags) &&
mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
mdname(mddev), mddev->max_disks);
return -EBUSY;
@ -2331,7 +2330,7 @@ repeat:
spin_lock(&mddev->lock);
mddev->utime = get_seconds();
mddev->utime = ktime_get_real_seconds();
if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
force_change = 1;
@ -2457,15 +2456,20 @@ static int add_bound_rdev(struct md_rdev *rdev)
{
struct mddev *mddev = rdev->mddev;
int err = 0;
bool add_journal = test_bit(Journal, &rdev->flags);
if (!mddev->pers->hot_remove_disk) {
if (!mddev->pers->hot_remove_disk || add_journal) {
/* If there is hot_add_disk but no hot_remove_disk
* then added disks for geometry changes,
* and should be added immediately.
*/
super_types[mddev->major_version].
validate_super(mddev, rdev);
if (add_journal)
mddev_suspend(mddev);
err = mddev->pers->hot_add_disk(mddev, rdev);
if (add_journal)
mddev_resume(mddev);
if (err) {
unbind_rdev_from_array(rdev);
export_rdev(rdev);
@ -5299,7 +5303,6 @@ int md_run(struct mddev *mddev)
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)
@ -5499,7 +5502,6 @@ static void __md_stop(struct mddev *mddev)
/* Ensure ->event_work is done */
flush_workqueue(md_misc_wq);
spin_lock(&mddev->lock);
mddev->ready = 0;
mddev->pers = NULL;
spin_unlock(&mddev->lock);
pers->free(mddev, mddev->private);
@ -5837,7 +5839,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
info.major_version = mddev->major_version;
info.minor_version = mddev->minor_version;
info.patch_version = MD_PATCHLEVEL_VERSION;
info.ctime = mddev->ctime;
info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX);
info.level = mddev->level;
info.size = mddev->dev_sectors / 2;
if (info.size != mddev->dev_sectors / 2) /* overflow */
@ -5847,7 +5849,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
info.md_minor = mddev->md_minor;
info.not_persistent= !mddev->persistent;
info.utime = mddev->utime;
info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX);
info.state = 0;
if (mddev->in_sync)
info.state = (1<<MD_SB_CLEAN);
@ -6038,8 +6040,23 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
else
clear_bit(WriteMostly, &rdev->flags);
if (info->state & (1<<MD_DISK_JOURNAL))
if (info->state & (1<<MD_DISK_JOURNAL)) {
struct md_rdev *rdev2;
bool has_journal = false;
/* make sure no existing journal disk */
rdev_for_each(rdev2, mddev) {
if (test_bit(Journal, &rdev2->flags)) {
has_journal = true;
break;
}
}
if (has_journal) {
export_rdev(rdev);
return -EBUSY;
}
set_bit(Journal, &rdev->flags);
}
/*
* check whether the device shows up in other nodes
*/
@ -6130,15 +6147,11 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev)
{
char b[BDEVNAME_SIZE];
struct md_rdev *rdev;
int ret = -1;
rdev = find_rdev(mddev, dev);
if (!rdev)
return -ENXIO;
if (mddev_is_clustered(mddev))
ret = md_cluster_ops->metadata_update_start(mddev);
if (rdev->raid_disk < 0)
goto kick_rdev;
@ -6149,7 +6162,7 @@ static int hot_remove_disk(struct mddev *mddev, dev_t dev)
goto busy;
kick_rdev:
if (mddev_is_clustered(mddev) && ret == 0)
if (mddev_is_clustered(mddev))
md_cluster_ops->remove_disk(mddev, rdev);
md_kick_rdev_from_array(rdev);
@ -6158,9 +6171,6 @@ kick_rdev:
return 0;
busy:
if (mddev_is_clustered(mddev) && ret == 0)
md_cluster_ops->metadata_update_cancel(mddev);
printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
bdevname(rdev->bdev,b), mdname(mddev));
return -EBUSY;
@ -6354,13 +6364,13 @@ static int set_array_info(struct mddev *mddev, mdu_array_info_t *info)
/* ensure mddev_put doesn't delete this now that there
* is some minimal configuration.
*/
mddev->ctime = get_seconds();
mddev->ctime = ktime_get_real_seconds();
return 0;
}
mddev->major_version = MD_MAJOR_VERSION;
mddev->minor_version = MD_MINOR_VERSION;
mddev->patch_version = MD_PATCHLEVEL_VERSION;
mddev->ctime = get_seconds();
mddev->ctime = ktime_get_real_seconds();
mddev->level = info->level;
mddev->clevel[0] = 0;
@ -6602,6 +6612,19 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
rv = -EINVAL;
goto err;
}
if (mddev->bitmap_info.nodes) {
/* hold PW on all the bitmap lock */
if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) {
printk("md: can't change bitmap to none since the"
" array is in use by more than one node\n");
rv = -EPERM;
md_cluster_ops->unlock_all_bitmaps(mddev);
goto err;
}
mddev->bitmap_info.nodes = 0;
md_cluster_ops->leave(mddev);
}
mddev->pers->quiesce(mddev, 1);
bitmap_destroy(mddev);
mddev->pers->quiesce(mddev, 0);
@ -7180,7 +7203,7 @@ void md_error(struct mddev *mddev, struct md_rdev *rdev)
md_wakeup_thread(mddev->thread);
if (mddev->event_work.func)
queue_work(md_misc_wq, &mddev->event_work);
md_new_event_inintr(mddev);
md_new_event(mddev);
}
EXPORT_SYMBOL(md_error);
@ -7704,7 +7727,7 @@ EXPORT_SYMBOL(md_write_end);
* attempting a GFP_KERNEL allocation while holding the mddev lock.
* Must be called with mddev_lock held.
*
* In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
* In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
* is dropped, so return -EAGAIN after notifying userspace.
*/
int md_allow_write(struct mddev *mddev)
@ -8169,19 +8192,20 @@ static int remove_and_add_spares(struct mddev *mddev,
continue;
if (test_bit(Faulty, &rdev->flags))
continue;
if (test_bit(Journal, &rdev->flags))
continue;
if (mddev->ro &&
! (rdev->saved_raid_disk >= 0 &&
!test_bit(Bitmap_sync, &rdev->flags)))
continue;
if (!test_bit(Journal, &rdev->flags)) {
if (mddev->ro &&
! (rdev->saved_raid_disk >= 0 &&
!test_bit(Bitmap_sync, &rdev->flags)))
continue;
rdev->recovery_offset = 0;
rdev->recovery_offset = 0;
}
if (mddev->pers->
hot_add_disk(mddev, rdev) == 0) {
if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
spares++;
if (!test_bit(Journal, &rdev->flags))
spares++;
md_new_event(mddev);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
}
@ -8276,6 +8300,7 @@ void md_check_recovery(struct mddev *mddev)
(mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
test_bit(MD_RELOAD_SB, &mddev->flags) ||
(mddev->external == 0 && mddev->safemode == 1) ||
(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
&& !mddev->in_sync && mddev->recovery_cp == MaxSector)
@ -8314,6 +8339,21 @@ void md_check_recovery(struct mddev *mddev)
goto unlock;
}
if (mddev_is_clustered(mddev)) {
struct md_rdev *rdev;
/* kick the device if another node issued a
* remove disk.
*/
rdev_for_each(rdev, mddev) {
if (test_and_clear_bit(ClusterRemove, &rdev->flags) &&
rdev->raid_disk < 0)
md_kick_rdev_from_array(rdev);
}
if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags))
md_reload_sb(mddev, mddev->good_device_nr);
}
if (!mddev->external) {
int did_change = 0;
spin_lock(&mddev->lock);
@ -8635,7 +8675,6 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
ret = remove_and_add_spares(mddev, rdev2);
pr_info("Activated spare: %s\n",
bdevname(rdev2->bdev,b));
continue;
}
/* device faulty
* We just want to do the minimum to mark the disk

11
drivers/md/md.h
View file

@ -162,6 +162,7 @@ enum flag_bits {
* Usually, this device should be faster
* than other devices in the array
*/
ClusterRemove,
};
static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
@ -200,6 +201,9 @@ struct mddev {
*/
#define MD_JOURNAL_CLEAN 5 /* A raid with journal is already clean */
#define MD_HAS_JOURNAL 6 /* The raid array has journal feature set */
#define MD_RELOAD_SB 7 /* Reload the superblock because another node
* updated it.
*/
int suspended;
atomic_t active_io;
@ -208,8 +212,6 @@ struct mddev {
* are happening, so run/
* takeover/stop are not safe
*/
int ready; /* See when safe to pass
* IO requests down */
struct gendisk *gendisk;
struct kobject kobj;
@ -226,7 +228,7 @@ struct mddev {
* managed externally */
char metadata_type[17]; /* externally set*/
int chunk_sectors;
time_t ctime, utime;
time64_t ctime, utime;
int level, layout;
char clevel[16];
int raid_disks;
@ -430,6 +432,7 @@ struct mddev {
struct work_struct event_work; /* used by dm to report failure event */
void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
struct md_cluster_info *cluster_info;
unsigned int good_device_nr; /* good device num within cluster raid */
};
static inline int __must_check mddev_lock(struct mddev *mddev)
@ -623,7 +626,7 @@ extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev);
extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors);
extern int md_check_no_bitmap(struct mddev *mddev);
extern int md_integrity_register(struct mddev *mddev);
extern void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev);
extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev);
extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
extern void mddev_init(struct mddev *mddev);

6
drivers/md/multipath.c
View file

@ -257,6 +257,9 @@ static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
err = md_integrity_add_rdev(rdev, mddev);
if (err)
break;
spin_lock_irq(&conf->device_lock);
mddev->degraded--;
rdev->raid_disk = path;
@ -264,9 +267,6 @@ static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev)
spin_unlock_irq(&conf->device_lock);
rcu_assign_pointer(p->rdev, rdev);
err = 0;
mddev_suspend(mddev);
md_integrity_add_rdev(rdev, mddev);
mddev_resume(mddev);
break;
}

6
drivers/md/raid1.c
View file

@ -1589,6 +1589,9 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (mddev->recovery_disabled == conf->recovery_disabled)
return -EBUSY;
if (md_integrity_add_rdev(rdev, mddev))
return -ENXIO;
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
@ -1632,9 +1635,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
break;
}
}
mddev_suspend(mddev);
md_integrity_add_rdev(rdev, mddev);
mddev_resume(mddev);
if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev)))
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
print_conf(conf);

6
drivers/md/raid10.c
View file

@ -1698,6 +1698,9 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (rdev->saved_raid_disk < 0 && !_enough(conf, 1, -1))
return -EINVAL;
if (md_integrity_add_rdev(rdev, mddev))
return -ENXIO;
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
@ -1739,9 +1742,6 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
rcu_assign_pointer(p->rdev, rdev);
break;
}
mddev_suspend(mddev);
md_integrity_add_rdev(rdev, mddev);
mddev_resume(mddev);
if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev)))
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);

158
drivers/md/raid5-cache.c
View file

@ -34,6 +34,12 @@
#define RECLAIM_MAX_FREE_SPACE (10 * 1024 * 1024 * 2) /* sector */
#define RECLAIM_MAX_FREE_SPACE_SHIFT (2)
/*
* We only need 2 bios per I/O unit to make progress, but ensure we
* have a few more available to not get too tight.
*/
#define R5L_POOL_SIZE 4
struct r5l_log {
struct md_rdev *rdev;
@ -69,7 +75,12 @@ struct r5l_log {
struct list_head finished_ios; /* io_units which settle down in log disk */
struct bio flush_bio;
struct list_head no_mem_stripes; /* pending stripes, -ENOMEM */
struct kmem_cache *io_kc;
mempool_t *io_pool;
struct bio_set *bs;
mempool_t *meta_pool;
struct md_thread *reclaim_thread;
unsigned long reclaim_target; /* number of space that need to be
@ -150,27 +161,6 @@ static bool r5l_has_free_space(struct r5l_log *log, sector_t size)
return log->device_size > used_size + size;
}
static void r5l_free_io_unit(struct r5l_log *log, struct r5l_io_unit *io)
{
__free_page(io->meta_page);
kmem_cache_free(log->io_kc, io);
}
static void r5l_move_io_unit_list(struct list_head *from, struct list_head *to,
enum r5l_io_unit_state state)
{
struct r5l_io_unit *io;
while (!list_empty(from)) {
io = list_first_entry(from, struct r5l_io_unit, log_sibling);
/* don't change list order */
if (io->state >= state)
list_move_tail(&io->log_sibling, to);
else
break;
}
}
static void __r5l_set_io_unit_state(struct r5l_io_unit *io,
enum r5l_io_unit_state state)
{
@ -206,6 +196,20 @@ static void r5l_log_run_stripes(struct r5l_log *log)
}
}
static void r5l_move_to_end_ios(struct r5l_log *log)
{
struct r5l_io_unit *io, *next;
assert_spin_locked(&log->io_list_lock);
list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) {
/* don't change list order */
if (io->state < IO_UNIT_IO_END)
break;
list_move_tail(&io->log_sibling, &log->io_end_ios);
}
}
static void r5l_log_endio(struct bio *bio)
{
struct r5l_io_unit *io = bio->bi_private;
@ -216,12 +220,12 @@ static void r5l_log_endio(struct bio *bio)
md_error(log->rdev->mddev, log->rdev);
bio_put(bio);
mempool_free(io->meta_page, log->meta_pool);
spin_lock_irqsave(&log->io_list_lock, flags);
__r5l_set_io_unit_state(io, IO_UNIT_IO_END);
if (log->need_cache_flush)
r5l_move_io_unit_list(&log->running_ios, &log->io_end_ios,
IO_UNIT_IO_END);
r5l_move_to_end_ios(log);
else
r5l_log_run_stripes(log);
spin_unlock_irqrestore(&log->io_list_lock, flags);
@ -255,7 +259,7 @@ static void r5l_submit_current_io(struct r5l_log *log)
static struct bio *r5l_bio_alloc(struct r5l_log *log)
{
struct bio *bio = bio_kmalloc(GFP_NOIO | __GFP_NOFAIL, BIO_MAX_PAGES);
struct bio *bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_PAGES, log->bs);
bio->bi_rw = WRITE;
bio->bi_bdev = log->rdev->bdev;
@ -286,15 +290,19 @@ static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log)
struct r5l_io_unit *io;
struct r5l_meta_block *block;
/* We can't handle memory allocate failure so far */
io = kmem_cache_zalloc(log->io_kc, GFP_NOIO | __GFP_NOFAIL);
io = mempool_alloc(log->io_pool, GFP_ATOMIC);
if (!io)
return NULL;
memset(io, 0, sizeof(*io));
io->log = log;
INIT_LIST_HEAD(&io->log_sibling);
INIT_LIST_HEAD(&io->stripe_list);
io->state = IO_UNIT_RUNNING;
io->meta_page = alloc_page(GFP_NOIO | __GFP_NOFAIL | __GFP_ZERO);
io->meta_page = mempool_alloc(log->meta_pool, GFP_NOIO);
block = page_address(io->meta_page);
clear_page(block);
block->magic = cpu_to_le32(R5LOG_MAGIC);
block->version = R5LOG_VERSION;
block->seq = cpu_to_le64(log->seq);
@ -324,8 +332,12 @@ static int r5l_get_meta(struct r5l_log *log, unsigned int payload_size)
log->current_io->meta_offset + payload_size > PAGE_SIZE)
r5l_submit_current_io(log);
if (!log->current_io)
if (!log->current_io) {
log->current_io = r5l_new_meta(log);
if (!log->current_io)
return -ENOMEM;
}
return 0;
}
@ -370,11 +382,12 @@ static void r5l_append_payload_page(struct r5l_log *log, struct page *page)
r5_reserve_log_entry(log, io);
}
static void r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh,
static int r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh,
int data_pages, int parity_pages)
{
int i;
int meta_size;
int ret;
struct r5l_io_unit *io;
meta_size =
@ -383,7 +396,10 @@ static void r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh,
sizeof(struct r5l_payload_data_parity) +
sizeof(__le32) * parity_pages;
r5l_get_meta(log, meta_size);
ret = r5l_get_meta(log, meta_size);
if (ret)
return ret;
io = log->current_io;
for (i = 0; i < sh->disks; i++) {
@ -413,6 +429,8 @@ static void r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh,
list_add_tail(&sh->log_list, &io->stripe_list);
atomic_inc(&io->pending_stripe);
sh->log_io = io;
return 0;
}
static void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
@ -427,6 +445,7 @@ int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh)
int meta_size;
int reserve;
int i;
int ret = 0;
if (!log)
return -EAGAIN;
@ -475,17 +494,22 @@ int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh)
mutex_lock(&log->io_mutex);
/* meta + data */
reserve = (1 + write_disks) << (PAGE_SHIFT - 9);
if (r5l_has_free_space(log, reserve))
r5l_log_stripe(log, sh, data_pages, parity_pages);
else {
if (!r5l_has_free_space(log, reserve)) {
spin_lock(&log->no_space_stripes_lock);
list_add_tail(&sh->log_list, &log->no_space_stripes);
spin_unlock(&log->no_space_stripes_lock);
r5l_wake_reclaim(log, reserve);
} else {
ret = r5l_log_stripe(log, sh, data_pages, parity_pages);
if (ret) {
spin_lock_irq(&log->io_list_lock);
list_add_tail(&sh->log_list, &log->no_mem_stripes);
spin_unlock_irq(&log->io_list_lock);
}
}
mutex_unlock(&log->io_mutex);
mutex_unlock(&log->io_mutex);
return 0;
}
@ -538,6 +562,21 @@ static sector_t r5l_reclaimable_space(struct r5l_log *log)
log->next_checkpoint);
}
static void r5l_run_no_mem_stripe(struct r5l_log *log)
{
struct stripe_head *sh;
assert_spin_locked(&log->io_list_lock);
if (!list_empty(&log->no_mem_stripes)) {
sh = list_first_entry(&log->no_mem_stripes,
struct stripe_head, log_list);
list_del_init(&sh->log_list);
set_bit(STRIPE_HANDLE, &sh->state);
raid5_release_stripe(sh);
}
}
static bool r5l_complete_finished_ios(struct r5l_log *log)
{
struct r5l_io_unit *io, *next;
@ -554,7 +593,8 @@ static bool r5l_complete_finished_ios(struct r5l_log *log)
log->next_cp_seq = io->seq;
list_del(&io->log_sibling);
r5l_free_io_unit(log, io);
mempool_free(io, log->io_pool);
r5l_run_no_mem_stripe(log);
found = true;
}
@ -787,6 +827,13 @@ void r5l_quiesce(struct r5l_log *log, int state)
return;
if (state == 0) {
log->in_teardown = 0;
/*
* This is a special case for hotadd. In suspend, the array has
* no journal. In resume, journal is initialized as well as the
* reclaim thread.
*/
if (log->reclaim_thread)
return;
log->reclaim_thread = md_register_thread(r5l_reclaim_thread,
log->rdev->mddev, "reclaim");
} else if (state == 1) {
@ -806,10 +853,18 @@ void r5l_quiesce(struct r5l_log *log, int state)
bool r5l_log_disk_error(struct r5conf *conf)
{
struct r5l_log *log;
bool ret;
/* don't allow write if journal disk is missing */
if (!conf->log)
return test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
return test_bit(Faulty, &conf->log->rdev->flags);
rcu_read_lock();
log = rcu_dereference(conf->log);
if (!log)
ret = test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
else
ret = test_bit(Faulty, &log->rdev->flags);
rcu_read_unlock();
return ret;
}
struct r5l_recovery_ctx {
@ -1160,23 +1215,45 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev)
if (!log->io_kc)
goto io_kc;
log->io_pool = mempool_create_slab_pool(R5L_POOL_SIZE, log->io_kc);
if (!log->io_pool)
goto io_pool;
log->bs = bioset_create(R5L_POOL_SIZE, 0);
if (!log->bs)
goto io_bs;
log->meta_pool = mempool_create_page_pool(R5L_POOL_SIZE, 0);
if (!log->meta_pool)
goto out_mempool;
log->reclaim_thread = md_register_thread(r5l_reclaim_thread,
log->rdev->mddev, "reclaim");
if (!log->reclaim_thread)
goto reclaim_thread;
init_waitqueue_head(&log->iounit_wait);
INIT_LIST_HEAD(&log->no_mem_stripes);
INIT_LIST_HEAD(&log->no_space_stripes);
spin_lock_init(&log->no_space_stripes_lock);
if (r5l_load_log(log))
goto error;
conf->log = log;
rcu_assign_pointer(conf->log, log);
set_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
return 0;
error:
md_unregister_thread(&log->reclaim_thread);
reclaim_thread:
mempool_destroy(log->meta_pool);
out_mempool:
bioset_free(log->bs);
io_bs:
mempool_destroy(log->io_pool);
io_pool:
kmem_cache_destroy(log->io_kc);
io_kc:
kfree(log);
@ -1186,6 +1263,9 @@ io_kc:
void r5l_exit_log(struct r5l_log *log)
{
md_unregister_thread(&log->reclaim_thread);
mempool_destroy(log->meta_pool);
bioset_free(log->bs);
mempool_destroy(log->io_pool);
kmem_cache_destroy(log->io_kc);
kfree(log);
}

36
drivers/md/raid5.c
View file

@ -772,8 +772,6 @@ static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh
int hash;
int dd_idx;
if (!stripe_can_batch(sh))
return;
/* Don't cross chunks, so stripe pd_idx/qd_idx is the same */
tmp_sec = sh->sector;
if (!sector_div(tmp_sec, conf->chunk_sectors))
@ -7141,14 +7139,19 @@ static int raid5_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
struct disk_info *p = conf->disks + number;
print_raid5_conf(conf);
if (test_bit(Journal, &rdev->flags)) {
if (test_bit(Journal, &rdev->flags) && conf->log) {
struct r5l_log *log;
/*
* journal disk is not removable, but we need give a chance to
* update superblock of other disks. Otherwise journal disk
* will be considered as 'fresh'
* we can't wait pending write here, as this is called in
* raid5d, wait will deadlock.
*/
set_bit(MD_CHANGE_DEVS, &mddev->flags);
return -EINVAL;
if (atomic_read(&mddev->writes_pending))
return -EBUSY;
log = conf->log;
conf->log = NULL;
synchronize_rcu();
r5l_exit_log(log);
return 0;
}
if (rdev == p->rdev)
rdevp = &p->rdev;
@ -7212,8 +7215,21 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
int first = 0;
int last = conf->raid_disks - 1;
if (test_bit(Journal, &rdev->flags))
return -EINVAL;
if (test_bit(Journal, &rdev->flags)) {
char b[BDEVNAME_SIZE];
if (conf->log)
return -EBUSY;
rdev->raid_disk = 0;
/*
* The array is in readonly mode if journal is missing, so no
* write requests running. We should be safe
*/
r5l_init_log(conf, rdev);
printk(KERN_INFO"md/raid:%s: using device %s as journal\n",
mdname(mddev), bdevname(rdev->bdev, b));
return 0;
}
if (mddev->recovery_disabled == conf->recovery_disabled)
return -EBUSY;