diff options
| author | Damien Le Moal <damien.lemoal@wdc.com> | 2021-05-26 06:24:54 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-19 09:44:46 +0200 |
| commit | cc4f0a9d5aa1b5abffb2366a0b37c37806362fe8 (patch) | |
| tree | b6e1a34ee24aafac2e792d036ff5bd42deec5c9f /drivers/md/dm.c | |
| parent | 939f750215b89d2cc774a85a6810286aec0f5718 (diff) | |
dm: Fix dm_accept_partial_bio() relative to zone management commands
[ Upstream commit 6842d264aa5205da338b6dcc6acfa2a6732558f1 ]
Fix dm_accept_partial_bio() to actually check that zone management
commands are not passed as explained in the function documentation
comment. Also, since a zone append operation cannot be split, add
REQ_OP_ZONE_APPEND as a forbidden command.
White lines are added around the group of BUG_ON() calls to make the
code more legible.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 638c04f9e832..19a70f434029 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1230,8 +1230,8 @@ static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, /* * A target may call dm_accept_partial_bio only from the map routine. It is - * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, - * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH. + * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management + * operations and REQ_OP_ZONE_APPEND (zone append writes). * * dm_accept_partial_bio informs the dm that the target only wants to process * additional n_sectors sectors of the bio and the rest of the data should be @@ -1261,9 +1261,13 @@ void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) { struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone); unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT; + BUG_ON(bio->bi_opf & REQ_PREFLUSH); + BUG_ON(op_is_zone_mgmt(bio_op(bio))); + BUG_ON(bio_op(bio) == REQ_OP_ZONE_APPEND); BUG_ON(bi_size > *tio->len_ptr); BUG_ON(n_sectors > bi_size); + *tio->len_ptr -= bi_size - n_sectors; bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT; } |