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| author | Mikulas Patocka <mpatocka@redhat.com> | 2016-08-30 22:11:53 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-08-30 22:16:49 +0200 |
| commit | a5d60783df61fbb67b7596b8a0f6b4b2e05251d5 (patch) | |
| tree | f7b3d3e7501084c2228997f074b3978a81918bab /drivers/md/dm-log-writes.c | |
| parent | Linux 4.8-rc4 (diff) | |
| download | linux-a5d60783df61fbb67b7596b8a0f6b4b2e05251d5.tar.xz linux-a5d60783df61fbb67b7596b8a0f6b4b2e05251d5.zip | |
dm log writes: move IO accounting earlier to fix error path
Move log_one_block()'s atomic_inc(&lc->io_blocks) before bio_alloc() to
fix a bug that the target hangs if bio_alloc() fails. The error path
does put_io_block(lc), so atomic_inc(&lc->io_blocks) must occur before
invoking the error path to avoid underflow of lc->io_blocks.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Josef Bacik <jbacik@fb,com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-log-writes.c')
| -rw-r--r-- | drivers/md/dm-log-writes.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c index 4ab68033f9d1..4cc78aef9007 100644 --- a/drivers/md/dm-log-writes.c +++ b/drivers/md/dm-log-writes.c @@ -259,12 +259,12 @@ static int log_one_block(struct log_writes_c *lc, goto out; sector++; + atomic_inc(&lc->io_blocks); bio = bio_alloc(GFP_KERNEL, block->vec_cnt); if (!bio) { DMERR("Couldn't alloc log bio"); goto error; } - atomic_inc(&lc->io_blocks); bio->bi_iter.bi_size = 0; bio->bi_iter.bi_sector = sector; bio->bi_bdev = lc->logdev->bdev; |