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| author | Ming Lei <ming.lei@redhat.com> | 2017-12-18 20:22:08 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-06 09:18:00 -0700 |
| commit | 8f50e358153dd68182c714626be4a90b64179cf4 (patch) | |
| tree | 271cef801d2e2757eed59270948993b65ae10d06 | |
| parent | 3c892a098b0bfa3e571f1f0d2a7e72fbaeea691a (diff) | |
| download | linux-8f50e358153dd68182c714626be4a90b64179cf4.tar.gz linux-8f50e358153dd68182c714626be4a90b64179cf4.tar.bz2 linux-8f50e358153dd68182c714626be4a90b64179cf4.zip | |
dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE
For BIO based DM, some targets aren't ready for dealing with bigger
incoming bio than 1Mbyte, such as crypt target.
Cc: Mike Snitzer <snitzer@redhat.com>
Cc:dm-devel@redhat.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/md/dm.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index de17b7193299..7475739fee49 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -920,7 +920,15 @@ int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) return -EINVAL; } - ti->max_io_len = (uint32_t) len; + /* + * 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); return 0; } |