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authorMikulas Patocka <mpatocka@redhat.com>2019-03-21 16:46:12 -0400
committerMike Snitzer <snitzer@redhat.com>2019-04-01 16:20:36 -0400
commit75ae193626de3238ca5fb895868ec91c94e63b1b (patch)
tree03bbd7c98d4a514e69b71d17eeb2916d172db0e5 /drivers
parent93fc91675a6c84d6ab355188aea398bda2cc51f8 (diff)
downloadlinux-75ae193626de3238ca5fb895868ec91c94e63b1b.tar.gz
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.c10
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;
}