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Two bugfixes for md

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both tagged for -stable
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Merge tag 'md/3.14-fixes' of git://neil.brown.name/md

Pull md fixes from Neil Brown:
 "Two bugfixes for md

  both tagged for -stable"

* tag 'md/3.14-fixes' of git://neil.brown.name/md:
  md/raid5: Fix CPU hotplug callback registration
  md/raid1: restore ability for check and repair to fix read errors.
This commit is contained in:
Linus Torvalds 2014-02-14 12:48:16 -08:00
commit bd3813d52d
2 changed files with 55 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/md/raid1.c
View File

@ -1953,11 +1953,15 @@ static int process_checks(struct r1bio *r1_bio)
for (i = 0; i < conf->raid_disks * 2; i++) {
int j;
int size;
int uptodate;
struct bio *b = r1_bio->bios[i];
if (b->bi_end_io != end_sync_read)
continue;
/* fixup the bio for reuse */
/* fixup the bio for reuse, but preserve BIO_UPTODATE */
uptodate = test_bit(BIO_UPTODATE, &b->bi_flags);
bio_reset(b);
if (!uptodate)
clear_bit(BIO_UPTODATE, &b->bi_flags);
b->bi_vcnt = vcnt;
b->bi_iter.bi_size = r1_bio->sectors << 9;
b->bi_iter.bi_sector = r1_bio->sector +
@ -1990,11 +1994,14 @@ static int process_checks(struct r1bio *r1_bio)
int j;
struct bio *pbio = r1_bio->bios[primary];
struct bio *sbio = r1_bio->bios[i];
int uptodate = test_bit(BIO_UPTODATE, &sbio->bi_flags);
if (sbio->bi_end_io != end_sync_read)
continue;
/* Now we can 'fixup' the BIO_UPTODATE flag */
set_bit(BIO_UPTODATE, &sbio->bi_flags);
if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) {
if (uptodate) {
for (j = vcnt; j-- ; ) {
struct page *p, *s;
p = pbio->bi_io_vec[j].bv_page;
@ -2009,7 +2016,7 @@ static int process_checks(struct r1bio *r1_bio)
if (j >= 0)
atomic64_add(r1_bio->sectors, &mddev->resync_mismatches);
if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
&& test_bit(BIO_UPTODATE, &sbio->bi_flags))) {
&& uptodate)) {
/* No need to write to this device. */
sbio->bi_end_io = NULL;
rdev_dec_pending(conf->mirrors[i].rdev, mddev);

92
drivers/md/raid5.c
View File

@ -5514,23 +5514,43 @@ raid5_size(struct mddev *mddev, sector_t sectors, int raid_disks)
return sectors * (raid_disks - conf->max_degraded);
}
static void free_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu)
{
safe_put_page(percpu->spare_page);
kfree(percpu->scribble);
percpu->spare_page = NULL;
percpu->scribble = NULL;
}
static int alloc_scratch_buffer(struct r5conf *conf, struct raid5_percpu *percpu)
{
if (conf->level == 6 && !percpu->spare_page)
percpu->spare_page = alloc_page(GFP_KERNEL);
if (!percpu->scribble)
percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL);
if (!percpu->scribble || (conf->level == 6 && !percpu->spare_page)) {
free_scratch_buffer(conf, percpu);
return -ENOMEM;
}
return 0;
}
static void raid5_free_percpu(struct r5conf *conf)
{
struct raid5_percpu *percpu;
unsigned long cpu;
if (!conf->percpu)
return;
get_online_cpus();
for_each_possible_cpu(cpu) {
percpu = per_cpu_ptr(conf->percpu, cpu);
safe_put_page(percpu->spare_page);
kfree(percpu->scribble);
}
#ifdef CONFIG_HOTPLUG_CPU
unregister_cpu_notifier(&conf->cpu_notify);
#endif
get_online_cpus();
for_each_possible_cpu(cpu)
free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu));
put_online_cpus();
free_percpu(conf->percpu);
@ -5557,15 +5577,7 @@ static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action,
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
if (conf->level == 6 && !percpu->spare_page)
percpu->spare_page = alloc_page(GFP_KERNEL);
if (!percpu->scribble)
percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL);
if (!percpu->scribble ||
(conf->level == 6 && !percpu->spare_page)) {
safe_put_page(percpu->spare_page);
kfree(percpu->scribble);
if (alloc_scratch_buffer(conf, percpu)) {
pr_err("%s: failed memory allocation for cpu%ld\n",
__func__, cpu);
return notifier_from_errno(-ENOMEM);
@ -5573,10 +5585,7 @@ static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action,
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
safe_put_page(percpu->spare_page);
kfree(percpu->scribble);
percpu->spare_page = NULL;
percpu->scribble = NULL;
free_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu));
break;
default:
break;
@ -5588,40 +5597,29 @@ static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action,
static int raid5_alloc_percpu(struct r5conf *conf)
{
unsigned long cpu;
struct page *spare_page;
struct raid5_percpu __percpu *allcpus;
void *scribble;
int err;
int err = 0;
allcpus = alloc_percpu(struct raid5_percpu);
if (!allcpus)
conf->percpu = alloc_percpu(struct raid5_percpu);
if (!conf->percpu)
return -ENOMEM;
conf->percpu = allcpus;
get_online_cpus();
err = 0;
for_each_present_cpu(cpu) {
if (conf->level == 6) {
spare_page = alloc_page(GFP_KERNEL);
if (!spare_page) {
err = -ENOMEM;
break;
}
per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page;
}
scribble = kmalloc(conf->scribble_len, GFP_KERNEL);
if (!scribble) {
err = -ENOMEM;
break;
}
per_cpu_ptr(conf->percpu, cpu)->scribble = scribble;
}
#ifdef CONFIG_HOTPLUG_CPU
conf->cpu_notify.notifier_call = raid456_cpu_notify;
conf->cpu_notify.priority = 0;
if (err == 0)
err = register_cpu_notifier(&conf->cpu_notify);
err = register_cpu_notifier(&conf->cpu_notify);
if (err)
return err;
#endif
get_online_cpus();
for_each_present_cpu(cpu) {
err = alloc_scratch_buffer(conf, per_cpu_ptr(conf->percpu, cpu));
if (err) {
pr_err("%s: failed memory allocation for cpu%ld\n",
__func__, cpu);
break;
}
}
put_online_cpus();
return err;