Messages in this thread Patch in this message |  | | From | Ming Lei <> | Subject | [PATCH v1 12/54] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE | Date | Tue, 27 Dec 2016 23:56:01 +0800 |
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For BIO based DM, some targets aren't ready for dealing with bigger incoming bio than 1Mbyte, such as crypt target.
Signed-off-by: Ming Lei <tom.leiming@gmail.com> --- drivers/md/dm.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 3086da5664f3..6139bf7623f7 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -899,7 +899,16 @@ 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; } -- 2.7.4
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