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2 fixes for md, tagged for -stable

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Merge tag 'md-3.6-fixes' of git://neil.brown.name/md

Pull md fixes from NeilBrown:
 "2 fixes for md, tagged for -stable"

* tag 'md-3.6-fixes' of git://neil.brown.name/md:
  md/raid10: fix problem with on-stack allocation of r10bio structure.
  md: Don't truncate size at 4TB for RAID0 and Linear
This commit is contained in:
Linus Torvalds 2012-08-17 17:47:32 -07:00
commit 1ce41cd849
3 changed files with 26 additions and 15 deletions

9
drivers/md/md.c
View File

@ -1108,8 +1108,11 @@ static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor
ret = 0;
}
rdev->sectors = rdev->sb_start;
/* Limit to 4TB as metadata cannot record more than that */
if (rdev->sectors >= (2ULL << 32))
/* Limit to 4TB as metadata cannot record more than that.
* (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 (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
@ -1400,7 +1403,7 @@ 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))
if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
num_sectors = (2ULL << 32) - 2;
md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
rdev->sb_page);

30
drivers/md/raid10.c
View File

@ -659,7 +659,11 @@ static int raid10_mergeable_bvec(struct request_queue *q,
max = biovec->bv_len;
if (mddev->merge_check_needed) {
struct r10bio r10_bio;
struct {
struct r10bio r10_bio;
struct r10dev devs[conf->copies];
} on_stack;
struct r10bio *r10_bio = &on_stack.r10_bio;
int s;
if (conf->reshape_progress != MaxSector) {
/* Cannot give any guidance during reshape */
@ -667,18 +671,18 @@ static int raid10_mergeable_bvec(struct request_queue *q,
return biovec->bv_len;
return 0;
}
r10_bio.sector = sector;
raid10_find_phys(conf, &r10_bio);
r10_bio->sector = sector;
raid10_find_phys(conf, r10_bio);
rcu_read_lock();
for (s = 0; s < conf->copies; s++) {
int disk = r10_bio.devs[s].devnum;
int disk = r10_bio->devs[s].devnum;
struct md_rdev *rdev = rcu_dereference(
conf->mirrors[disk].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags)) {
struct request_queue *q =
bdev_get_queue(rdev->bdev);
if (q->merge_bvec_fn) {
bvm->bi_sector = r10_bio.devs[s].addr
bvm->bi_sector = r10_bio->devs[s].addr
+ rdev->data_offset;
bvm->bi_bdev = rdev->bdev;
max = min(max, q->merge_bvec_fn(
@ -690,7 +694,7 @@ static int raid10_mergeable_bvec(struct request_queue *q,
struct request_queue *q =
bdev_get_queue(rdev->bdev);
if (q->merge_bvec_fn) {
bvm->bi_sector = r10_bio.devs[s].addr
bvm->bi_sector = r10_bio->devs[s].addr
+ rdev->data_offset;
bvm->bi_bdev = rdev->bdev;
max = min(max, q->merge_bvec_fn(
@ -4414,14 +4418,18 @@ static int handle_reshape_read_error(struct mddev *mddev,
{
/* Use sync reads to get the blocks from somewhere else */
int sectors = r10_bio->sectors;
struct r10bio r10b;
struct r10conf *conf = mddev->private;
struct {
struct r10bio r10_bio;
struct r10dev devs[conf->copies];
} on_stack;
struct r10bio *r10b = &on_stack.r10_bio;
int slot = 0;
int idx = 0;
struct bio_vec *bvec = r10_bio->master_bio->bi_io_vec;
r10b.sector = r10_bio->sector;
__raid10_find_phys(&conf->prev, &r10b);
r10b->sector = r10_bio->sector;
__raid10_find_phys(&conf->prev, r10b);
while (sectors) {
int s = sectors;
@ -4432,7 +4440,7 @@ static int handle_reshape_read_error(struct mddev *mddev,
s = PAGE_SIZE >> 9;
while (!success) {
int d = r10b.devs[slot].devnum;
int d = r10b->devs[slot].devnum;
struct md_rdev *rdev = conf->mirrors[d].rdev;
sector_t addr;
if (rdev == NULL ||
@ -4440,7 +4448,7 @@ static int handle_reshape_read_error(struct mddev *mddev,
!test_bit(In_sync, &rdev->flags))
goto failed;
addr = r10b.devs[slot].addr + idx * PAGE_SIZE;
addr = r10b->devs[slot].addr + idx * PAGE_SIZE;
success = sync_page_io(rdev,
addr,
s << 9,

2
drivers/md/raid10.h
View File

@ -110,7 +110,7 @@ struct r10bio {
* We choose the number when they are allocated.
* We sometimes need an extra bio to write to the replacement.
*/
struct {
struct r10dev {
struct bio *bio;
union {
struct bio *repl_bio; /* used for resync and