| commit | a920f6b3accc77d9dddbc98a7426be23ee479625 | |
| author | Mikulas Patocka <mpatocka@redhat.com> | |
| Thu, 2 Apr 2009 18:55:23 +0000 (2 19:55 +0100) | ||
| committer | Alasdair G Kergon <agk@redhat.com> | |
| Thu, 2 Apr 2009 18:55:23 +0000 (2 19:55 +0100) | ||
| tree | bff633328b5f1362d99a04f7e513a6a4b2084ad8 | treesnapshot (tar.gz zip) |
| parent | 833bb3046b6cb320e775ea2160ddca87d53260d5 | commitdiff |
dm: preserve bi_io_vec when resubmitting bios
Device mapper saves and restores various fields in the bio, but it doesn't save
bi_io_vec. If the device driver modifies this after a partially successful
request, dm-raid1 and dm-multipath may attempt to resubmit a bio that has
bi_size inconsistent with the size of vector.
To make requests resubmittable in dm-raid1 and dm-multipath, we must save
and restore the bio vector as well.
To reduce the memory overhead involved in this, we do not save the pages in a
vector and use a 16-bit field size if the page size is less than 65536.
Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Device mapper saves and restores various fields in the bio, but it doesn't save
bi_io_vec. If the device driver modifies this after a partially successful
request, dm-raid1 and dm-multipath may attempt to resubmit a bio that has
bi_size inconsistent with the size of vector.
To make requests resubmittable in dm-raid1 and dm-multipath, we must save
and restore the bio vector as well.
To reduce the memory overhead involved in this, we do not save the pages in a
vector and use a 16-bit field size if the page size is less than 65536.
Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| drivers/md/dm-bio-record.h | diffblobblamehistory |