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authorNeilBrown <neilb@suse.de>2010-10-19 12:54:01 +1100
committerNeilBrown <neilb@suse.de>2010-10-28 17:34:07 +1100
commit4e78064f42ad474ce9c31760861f7fb0cfc22532 (patch)
tree3a1abaa98ebcbd62eacfbe95d72e44195fb3bc1f /drivers/md/raid1.c
parente804ac780e2f01cb3b914daca2fd4780d1743db1 (diff)
md: Fix possible deadlock with multiple mempool allocations.
It is not safe to allocate from a mempool while holding an item previously allocated from that mempool as that can deadlock when the mempool is close to exhaustion. So don't use a bio list to collect the bios to write to multiple devices in raid1 and raid10. Instead queue each bio as it becomes available so an unplug will activate all previously allocated bios and so a new bio has a chance of being allocated. This means we must set the 'remaining' count to '1' before submitting any requests, then when all are submitted, decrement 'remaining' and possible handle the write completion at that point. Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com> Tested-by: Torsten Kaiser <just.for.lkml@googlemail.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid1.c')
-rw-r--r--drivers/md/raid1.c98
1 files changed, 46 insertions, 52 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a4b85a94753..3362cfc8073 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -306,6 +306,28 @@ static void raid1_end_read_request(struct bio *bio, int error)
rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
}
+static void r1_bio_write_done(r1bio_t *r1_bio, int vcnt, struct bio_vec *bv,
+ int behind)
+{
+ if (atomic_dec_and_test(&r1_bio->remaining))
+ {
+ /* it really is the end of this request */
+ if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
+ /* free extra copy of the data pages */
+ int i = vcnt;
+ while (i--)
+ safe_put_page(bv[i].bv_page);
+ }
+ /* clear the bitmap if all writes complete successfully */
+ bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
+ r1_bio->sectors,
+ !test_bit(R1BIO_Degraded, &r1_bio->state),
+ behind);
+ md_write_end(r1_bio->mddev);
+ raid_end_bio_io(r1_bio);
+ }
+}
+
static void raid1_end_write_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
@@ -373,21 +395,7 @@ static void raid1_end_write_request(struct bio *bio, int error)
* Let's see if all mirrored write operations have finished
* already.
*/
- if (atomic_dec_and_test(&r1_bio->remaining)) {
- if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
- /* free extra copy of the data pages */
- int i = bio->bi_vcnt;
- while (i--)
- safe_put_page(bio->bi_io_vec[i].bv_page);
- }
- /* clear the bitmap if all writes complete successfully */
- bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
- r1_bio->sectors,
- !test_bit(R1BIO_Degraded, &r1_bio->state),
- behind);
- md_write_end(r1_bio->mddev);
- raid_end_bio_io(r1_bio);
- }
+ r1_bio_write_done(r1_bio, bio->bi_vcnt, bio->bi_io_vec, behind);
if (to_put)
bio_put(to_put);
@@ -735,23 +743,26 @@ static void unfreeze_array(conf_t *conf)
}
-/* duplicate the data pages for behind I/O */
-static struct page **alloc_behind_pages(struct bio *bio)
+/* duplicate the data pages for behind I/O
+ * We return a list of bio_vec rather than just page pointers
+ * as it makes freeing easier
+ */
+static struct bio_vec *alloc_behind_pages(struct bio *bio)
{
int i;
struct bio_vec *bvec;
- struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page *),
+ struct bio_vec *pages = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec),
GFP_NOIO);
if (unlikely(!pages))
goto do_sync_io;
bio_for_each_segment(bvec, bio, i) {
- pages[i] = alloc_page(GFP_NOIO);
- if (unlikely(!pages[i]))
+ pages[i].bv_page = alloc_page(GFP_NOIO);
+ if (unlikely(!pages[i].bv_page))
goto do_sync_io;
- memcpy(kmap(pages[i]) + bvec->bv_offset,
+ memcpy(kmap(pages[i].bv_page) + bvec->bv_offset,
kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len);
- kunmap(pages[i]);
+ kunmap(pages[i].bv_page);
kunmap(bvec->bv_page);
}
@@ -759,8 +770,8 @@ static struct page **alloc_behind_pages(struct bio *bio)
do_sync_io:
if (pages)
- for (i = 0; i < bio->bi_vcnt && pages[i]; i++)
- put_page(pages[i]);
+ for (i = 0; i < bio->bi_vcnt && pages[i].bv_page; i++)
+ put_page(pages[i].bv_page);
kfree(pages);
PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size);
return NULL;
@@ -775,8 +786,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
int i, targets = 0, disks;
struct bitmap *bitmap;
unsigned long flags;
- struct bio_list bl;
- struct page **behind_pages = NULL;
+ struct bio_vec *behind_pages = NULL;
const int rw = bio_data_dir(bio);
const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
@@ -873,13 +883,6 @@ static int make_request(mddev_t *mddev, struct bio * bio)
* bios[x] to bio
*/
disks = conf->raid_disks;
-#if 0
- { static int first=1;
- if (first) printk("First Write sector %llu disks %d\n",
- (unsigned long long)r1_bio->sector, disks);
- first = 0;
- }
-#endif
retry_write:
blocked_rdev = NULL;
rcu_read_lock();
@@ -937,10 +940,11 @@ static int make_request(mddev_t *mddev, struct bio * bio)
(behind_pages = alloc_behind_pages(bio)) != NULL)
set_bit(R1BIO_BehindIO, &r1_bio->state);
- atomic_set(&r1_bio->remaining, 0);
+ atomic_set(&r1_bio->remaining, 1);
atomic_set(&r1_bio->behind_remaining, 0);
- bio_list_init(&bl);
+ bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors,
+ test_bit(R1BIO_BehindIO, &r1_bio->state));
for (i = 0; i < disks; i++) {
struct bio *mbio;
if (!r1_bio->bios[i])
@@ -967,35 +971,25 @@ static int make_request(mddev_t *mddev, struct bio * bio)
* them all
*/
__bio_for_each_segment(bvec, mbio, j, 0)
- bvec->bv_page = behind_pages[j];
+ bvec->bv_page = behind_pages[j].bv_page;
if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
}
atomic_inc(&r1_bio->remaining);
-
- bio_list_add(&bl, mbio);
+ spin_lock_irqsave(&conf->device_lock, flags);
+ bio_list_add(&conf->pending_bio_list, mbio);
+ blk_plug_device(mddev->queue);
+ spin_unlock_irqrestore(&conf->device_lock, flags);
}
+ r1_bio_write_done(r1_bio, bio->bi_vcnt, behind_pages, behind_pages != NULL);
kfree(behind_pages); /* the behind pages are attached to the bios now */
- bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors,
- test_bit(R1BIO_BehindIO, &r1_bio->state));
- spin_lock_irqsave(&conf->device_lock, flags);
- bio_list_merge(&conf->pending_bio_list, &bl);
- bio_list_init(&bl);
-
- blk_plug_device(mddev->queue);
- spin_unlock_irqrestore(&conf->device_lock, flags);
-
- /* In case raid1d snuck into freeze_array */
+ /* In case raid1d snuck in to freeze_array */
wake_up(&conf->wait_barrier);
if (do_sync)
md_wakeup_thread(mddev->thread);
-#if 0
- while ((bio = bio_list_pop(&bl)) != NULL)
- generic_make_request(bio);
-#endif
return 0;
}