diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2019-03-21 16:46:12 -0400 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2019-04-01 16:20:36 -0400 |
| commit | 75ae193626de3238ca5fb895868ec91c94e63b1b (patch) | |
| tree | 03bbd7c98d4a514e69b71d17eeb2916d172db0e5 /drivers | |
| parent | 93fc91675a6c84d6ab355188aea398bda2cc51f8 (diff) | |
dm: revert 8f50e358153d ("dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE")
The limit was already incorporated to dm-crypt with commit 4e870e948fba
("dm crypt: fix error with too large bios"), so we don't need to apply
it globally to all targets. The quantity BIO_MAX_PAGES * PAGE_SIZE is
wrong anyway because the variable ti->max_io_len it is supposed to be in
the units of 512-byte sectors not in bytes.
Reduction of the limit to 1048576 sectors could even cause data
corruption in rare cases - suppose that we have a dm-striped device with
stripe size 768MiB. The target will call dm_set_target_max_io_len with
the value 1572864. The buggy code would reduce it to 1048576. Now, the
dm-core will errorneously split the bios on 1048576-sector boundary
insetad of 1572864-sector boundary and pass these stripe-crossing bios
to the striped target.
Cc: stable@vger.kernel.org # v4.16+
Fixes: 8f50e358153d ("dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm.c | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 68d24056d0b1..89b04169658d 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1042,15 +1042,7 @@ int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) return -EINVAL; } - /* - * BIO based queue uses its own splitting. When multipage bvecs - * is switched on, size of the incoming bio may be too big to - * be handled in some targets, such as crypt. - * - * When these targets are ready for the big bio, we can remove - * the limit. - */ - ti->max_io_len = min_t(uint32_t, len, BIO_MAX_PAGES * PAGE_SIZE); + ti->max_io_len = (uint32_t) len; return 0; } |