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md: collection of bug fixes for 3.5 

You go away for 2 weeks vacation and what do you get when you come back?
 Piles of bugs :-)
 
 Some found by inspection, some by testing, some during use in the field,
 and some while developing for the next window...
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Merge tag 'md-3.5-fixes' of git://neil.brown.name/md

Pull md fixes from NeilBrown:
 "md: collection of bug fixes for 3.5

  You go away for 2 weeks vacation and what do you get when you come
  back? Piles of bugs :-)

  Some found by inspection, some by testing, some during use in the
  field, and some while developing for the next window..."

* tag 'md-3.5-fixes' of git://neil.brown.name/md:
  md: fix up plugging (again).
  md: support re-add of recovering devices.
  md/raid1: fix bug in read_balance introduced by hot-replace
  raid5: delayed stripe fix
  md/raid456: When read error cannot be recovered, record bad block
  md: make 'name' arg to md_register_thread non-optional.
  md/raid10: fix failure when trying to repair a read error.
  md/raid5: fix refcount problem when blocked_rdev is set.
  md:Add blk_plug in sync_thread.
  md/raid5: In ops_run_io, inc nr_pending before calling md_wait_for_blocked_rdev
  md/raid5: Do not add data_offset before call to is_badblock
  md/raid5: prefer replacing failed devices over want-replacement devices.
  md/raid10: Don't try to recovery unmatched (and unused) chunks.
This commit is contained in:
Linus Torvalds 2012-07-03 10:40:43 -07:00
parent 3bfd245476 b357f04a67
commit 2fb748d265
5 changed files with 75 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/md/md.c
View File

@ -5784,8 +5784,7 @@ static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
super_types[mddev->major_version].
validate_super(mddev, rdev);
if ((info->state & (1<<MD_DISK_SYNC)) &&
(!test_bit(In_sync, &rdev->flags) ||
rdev->raid_disk != info->raid_disk)) {
rdev->raid_disk != info->raid_disk) {
/* This was a hot-add request, but events doesn't
* match, so reject it.
*/
@ -6751,7 +6750,7 @@ struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev
thread->tsk = kthread_run(md_thread, thread,
"%s_%s",
mdname(thread->mddev),
name ?: mddev->pers->name);
name);
if (IS_ERR(thread->tsk)) {
kfree(thread);
return NULL;
@ -7298,6 +7297,7 @@ void md_do_sync(struct mddev *mddev)
int skipped = 0;
struct md_rdev *rdev;
char *desc;
struct blk_plug plug;
/* just incase thread restarts... */
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
@ -7447,6 +7447,7 @@ void md_do_sync(struct mddev *mddev)
}
mddev->curr_resync_completed = j;
blk_start_plug(&plug);
while (j < max_sectors) {
sector_t sectors;
@ -7552,6 +7553,7 @@ void md_do_sync(struct mddev *mddev)
* this also signals 'finished resyncing' to md_stop
*/
out:
blk_finish_plug(&plug);
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
/* tell personality that we are finished */

3
drivers/md/multipath.c
View File

@ -474,7 +474,8 @@ static int multipath_run (struct mddev *mddev)
}
{
mddev->thread = md_register_thread(multipathd, mddev, NULL);
mddev->thread = md_register_thread(multipathd, mddev,
"multipath");
if (!mddev->thread) {
printk(KERN_ERR "multipath: couldn't allocate thread"
" for %s\n", mdname(mddev));

13
drivers/md/raid1.c
View File

@ -517,8 +517,8 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
int bad_sectors;
int disk = start_disk + i;
if (disk >= conf->raid_disks)
disk -= conf->raid_disks;
if (disk >= conf->raid_disks * 2)
disk -= conf->raid_disks * 2;
rdev = rcu_dereference(conf->mirrors[disk].rdev);
if (r1_bio->bios[disk] == IO_BLOCKED
@ -883,7 +883,6 @@ static void make_request(struct mddev *mddev, struct bio * bio)
const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
struct md_rdev *blocked_rdev;
int plugged;
int first_clone;
int sectors_handled;
int max_sectors;
@ -1034,7 +1033,6 @@ read_again:
* the bad blocks. Each set of writes gets it's own r1bio
* with a set of bios attached.
*/
plugged = mddev_check_plugged(mddev);
disks = conf->raid_disks * 2;
retry_write:
@ -1191,6 +1189,8 @@ read_again:
bio_list_add(&conf->pending_bio_list, mbio);
conf->pending_count++;
spin_unlock_irqrestore(&conf->device_lock, flags);
if (!mddev_check_plugged(mddev))
md_wakeup_thread(mddev->thread);
}
/* Mustn't call r1_bio_write_done before this next test,
* as it could result in the bio being freed.
@ -1213,9 +1213,6 @@ read_again:
/* In case raid1d snuck in to freeze_array */
wake_up(&conf->wait_barrier);
if (do_sync || !bitmap || !plugged)
md_wakeup_thread(mddev->thread);
}
static void status(struct seq_file *seq, struct mddev *mddev)
@ -2621,7 +2618,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
goto abort;
}
err = -ENOMEM;
conf->thread = md_register_thread(raid1d, mddev, NULL);
conf->thread = md_register_thread(raid1d, mddev, "raid1");
if (!conf->thread) {
printk(KERN_ERR
"md/raid1:%s: couldn't allocate thread\n",

26
drivers/md/raid10.c
View File

@ -1039,7 +1039,6 @@ static void make_request(struct mddev *mddev, struct bio * bio)
const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
unsigned long flags;
struct md_rdev *blocked_rdev;
int plugged;
int sectors_handled;
int max_sectors;
int sectors;
@ -1239,7 +1238,6 @@ read_again:
* of r10_bios is recored in bio->bi_phys_segments just as with
* the read case.
*/
plugged = mddev_check_plugged(mddev);
r10_bio->read_slot = -1; /* make sure repl_bio gets freed */
raid10_find_phys(conf, r10_bio);
@ -1396,6 +1394,8 @@ retry_write:
bio_list_add(&conf->pending_bio_list, mbio);
conf->pending_count++;
spin_unlock_irqrestore(&conf->device_lock, flags);
if (!mddev_check_plugged(mddev, 0, 0))
md_wakeup_thread(mddev->thread);
if (!r10_bio->devs[i].repl_bio)
continue;
@ -1423,6 +1423,8 @@ retry_write:
bio_list_add(&conf->pending_bio_list, mbio);
conf->pending_count++;
spin_unlock_irqrestore(&conf->device_lock, flags);
if (!mddev_check_plugged(mddev))
md_wakeup_thread(mddev->thread);
}
/* Don't remove the bias on 'remaining' (one_write_done) until
@ -1448,9 +1450,6 @@ retry_write:
/* In case raid10d snuck in to freeze_array */
wake_up(&conf->wait_barrier);
if (do_sync || !mddev->bitmap || !plugged)
md_wakeup_thread(mddev->thread);
}
static void status(struct seq_file *seq, struct mddev *mddev)
@ -2310,7 +2309,7 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
if (r10_sync_page_io(rdev,
r10_bio->devs[sl].addr +
sect,
s<<9, conf->tmppage, WRITE)
s, conf->tmppage, WRITE)
== 0) {
/* Well, this device is dead */
printk(KERN_NOTICE
@ -2349,7 +2348,7 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
switch (r10_sync_page_io(rdev,
r10_bio->devs[sl].addr +
sect,
s<<9, conf->tmppage,
s, conf->tmppage,
READ)) {
case 0:
/* Well, this device is dead */
@ -2512,7 +2511,7 @@ read_more:
slot = r10_bio->read_slot;
printk_ratelimited(
KERN_ERR
"md/raid10:%s: %s: redirecting"
"md/raid10:%s: %s: redirecting "
"sector %llu to another mirror\n",
mdname(mddev),
bdevname(rdev->bdev, b),
@ -2661,7 +2660,8 @@ static void raid10d(struct mddev *mddev)
blk_start_plug(&plug);
for (;;) {
flush_pending_writes(conf);
if (atomic_read(&mddev->plug_cnt) == 0)
flush_pending_writes(conf);
spin_lock_irqsave(&conf->device_lock, flags);
if (list_empty(head)) {
@ -2890,6 +2890,12 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
/* want to reconstruct this device */
rb2 = r10_bio;
sect = raid10_find_virt(conf, sector_nr, i);
if (sect >= mddev->resync_max_sectors) {
/* last stripe is not complete - don't
* try to recover this sector.
*/
continue;
}
/* Unless we are doing a full sync, or a replacement
* we only need to recover the block if it is set in
* the bitmap
@ -3421,7 +3427,7 @@ static struct r10conf *setup_conf(struct mddev *mddev)
spin_lock_init(&conf->resync_lock);
init_waitqueue_head(&conf->wait_barrier);
conf->thread = md_register_thread(raid10d, mddev, NULL);
conf->thread = md_register_thread(raid10d, mddev, "raid10");
if (!conf->thread)
goto out;

67
drivers/md/raid5.c
View File

@ -196,12 +196,14 @@ static void __release_stripe(struct r5conf *conf, struct stripe_head *sh)
BUG_ON(!list_empty(&sh->lru));
BUG_ON(atomic_read(&conf->active_stripes)==0);
if (test_bit(STRIPE_HANDLE, &sh->state)) {
if (test_bit(STRIPE_DELAYED, &sh->state))
if (test_bit(STRIPE_DELAYED, &sh->state) &&
!test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
list_add_tail(&sh->lru, &conf->delayed_list);
else if (test_bit(STRIPE_BIT_DELAY, &sh->state) &&
sh->bm_seq - conf->seq_write > 0)
list_add_tail(&sh->lru, &conf->bitmap_list);
else {
clear_bit(STRIPE_DELAYED, &sh->state);
clear_bit(STRIPE_BIT_DELAY, &sh->state);
list_add_tail(&sh->lru, &conf->handle_list);
}
@ -606,6 +608,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
* a chance*/
md_check_recovery(conf->mddev);
}
/*
* Because md_wait_for_blocked_rdev
* will dec nr_pending, we must
* increment it first.
*/
atomic_inc(&rdev->nr_pending);
md_wait_for_blocked_rdev(rdev, conf->mddev);
} else {
/* Acknowledged bad block - skip the write */
@ -1737,6 +1745,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
} else {
const char *bdn = bdevname(rdev->bdev, b);
int retry = 0;
int set_bad = 0;
clear_bit(R5_UPTODATE, &sh->dev[i].flags);
atomic_inc(&rdev->read_errors);
@ -1748,7 +1757,8 @@ static void raid5_end_read_request(struct bio * bi, int error)
mdname(conf->mddev),
(unsigned long long)s,
bdn);
else if (conf->mddev->degraded >= conf->max_degraded)
else if (conf->mddev->degraded >= conf->max_degraded) {
set_bad = 1;
printk_ratelimited(
KERN_WARNING
"md/raid:%s: read error not correctable "
@ -1756,8 +1766,9 @@ static void raid5_end_read_request(struct bio * bi, int error)
mdname(conf->mddev),
(unsigned long long)s,
bdn);
else if (test_bit(R5_ReWrite, &sh->dev[i].flags))
} else if (test_bit(R5_ReWrite, &sh->dev[i].flags)) {
/* Oh, no!!! */
set_bad = 1;
printk_ratelimited(
KERN_WARNING
"md/raid:%s: read error NOT corrected!! "
@ -1765,7 +1776,7 @@ static void raid5_end_read_request(struct bio * bi, int error)
mdname(conf->mddev),
(unsigned long long)s,
bdn);
else if (atomic_read(&rdev->read_errors)
} else if (atomic_read(&rdev->read_errors)
> conf->max_nr_stripes)
printk(KERN_WARNING
"md/raid:%s: Too many read errors, failing device %s.\n",
@ -1777,7 +1788,11 @@ static void raid5_end_read_request(struct bio * bi, int error)
else {
clear_bit(R5_ReadError, &sh->dev[i].flags);
clear_bit(R5_ReWrite, &sh->dev[i].flags);
md_error(conf->mddev, rdev);
if (!(set_bad
&& test_bit(In_sync, &rdev->flags)
&& rdev_set_badblocks(
rdev, sh->sector, STRIPE_SECTORS, 0)))
md_error(conf->mddev, rdev);
}
}
rdev_dec_pending(rdev, conf->mddev);
@ -3582,8 +3597,18 @@ static void handle_stripe(struct stripe_head *sh)
finish:
/* wait for this device to become unblocked */
if (conf->mddev->external && unlikely(s.blocked_rdev))
md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);
if (unlikely(s.blocked_rdev)) {
if (conf->mddev->external)
md_wait_for_blocked_rdev(s.blocked_rdev,
conf->mddev);
else
/* Internal metadata will immediately
* be written by raid5d, so we don't
* need to wait here.
*/
rdev_dec_pending(s.blocked_rdev,
conf->mddev);
}
if (s.handle_bad_blocks)
for (i = disks; i--; ) {
@ -3881,8 +3906,6 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
raid_bio->bi_next = (void*)rdev;
align_bi->bi_bdev = rdev->bdev;
align_bi->bi_flags &= ~(1 << BIO_SEG_VALID);
/* No reshape active, so we can trust rdev->data_offset */
align_bi->bi_sector += rdev->data_offset;
if (!bio_fits_rdev(align_bi) ||
is_badblock(rdev, align_bi->bi_sector, align_bi->bi_size>>9,
@ -3893,6 +3916,9 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
return 0;
}
/* No reshape active, so we can trust rdev->data_offset */
align_bi->bi_sector += rdev->data_offset;
spin_lock_irq(&conf->device_lock);
wait_event_lock_irq(conf->wait_for_stripe,
conf->quiesce == 0,
@ -3971,7 +3997,6 @@ static void make_request(struct mddev *mddev, struct bio * bi)
struct stripe_head *sh;
const int rw = bio_data_dir(bi);
int remaining;
int plugged;
if (unlikely(bi->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bi);
@ -3990,7 +4015,6 @@ static void make_request(struct mddev *mddev, struct bio * bi)
bi->bi_next = NULL;
bi->bi_phys_segments = 1; /* over-loaded to count active stripes */
plugged = mddev_check_plugged(mddev);
for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
DEFINE_WAIT(w);
int previous;
@ -4092,6 +4116,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
if ((bi->bi_rw & REQ_SYNC) &&
!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
atomic_inc(&conf->preread_active_stripes);
mddev_check_plugged(mddev);
release_stripe(sh);
} else {
/* cannot get stripe for read-ahead, just give-up */
@ -4099,10 +4124,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
finish_wait(&conf->wait_for_overlap, &w);
break;
}
}
if (!plugged)
md_wakeup_thread(mddev->thread);
spin_lock_irq(&conf->device_lock);
remaining = raid5_dec_bi_phys_segments(bi);
@ -4823,6 +4845,7 @@ static struct r5conf *setup_conf(struct mddev *mddev)
int raid_disk, memory, max_disks;
struct md_rdev *rdev;
struct disk_info *disk;
char pers_name[6];
if (mddev->new_level != 5
&& mddev->new_level != 4
@ -4946,7 +4969,8 @@ static struct r5conf *setup_conf(struct mddev *mddev)
printk(KERN_INFO "md/raid:%s: allocated %dkB\n",
mdname(mddev), memory);
conf->thread = md_register_thread(raid5d, mddev, NULL);
sprintf(pers_name, "raid%d", mddev->new_level);
conf->thread = md_register_thread(raid5d, mddev, pers_name);
if (!conf->thread) {
printk(KERN_ERR
"md/raid:%s: couldn't allocate thread.\n",
@ -5465,10 +5489,9 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (rdev->saved_raid_disk >= 0 &&
rdev->saved_raid_disk >= first &&
conf->disks[rdev->saved_raid_disk].rdev == NULL)
disk = rdev->saved_raid_disk;
else
disk = first;
for ( ; disk <= last ; disk++) {
first = rdev->saved_raid_disk;
for (disk = first; disk <= last; disk++) {
p = conf->disks + disk;
if (p->rdev == NULL) {
clear_bit(In_sync, &rdev->flags);
@ -5477,8 +5500,11 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (rdev->saved_raid_disk != disk)
conf->fullsync = 1;
rcu_assign_pointer(p->rdev, rdev);
break;
goto out;
}
}
for (disk = first; disk <= last; disk++) {
p = conf->disks + disk;
if (test_bit(WantReplacement, &p->rdev->flags) &&
p->replacement == NULL) {
clear_bit(In_sync, &rdev->flags);
@ -5490,6 +5516,7 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
break;
}
}
out:
print_raid5_conf(conf);
return err;
}