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authorMing Lei2017-12-18 20:22:09 +0800
committerJens Axboe2018-01-06 09:18:00 -0700
commitc2421edf5f9151d0eb28affbf76e9e4f8ddd03c6 (patch)
tree2b766d69e02c2941c2996e2902b54fc859625751 /drivers
parent8f50e358153dd68182c714626be4a90b64179cf4 (diff)
bcache: comment on direct access to bvec table
All direct access to bvec table are safe even after multipage bvec is supported. Cc: linux-bcache@vger.kernel.org Acked-by: Coly Li <colyli@suse.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/bcache/btree.c1
-rw-r--r--drivers/md/bcache/util.c7
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 81e8dc3dbe5e..02a4cf646fdc 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -432,6 +432,7 @@ static void do_btree_node_write(struct btree *b)
continue_at(cl, btree_node_write_done, NULL);
} else {
+ /* No problem for multipage bvec since the bio is just allocated */
b->bio->bi_vcnt = 0;
bch_bio_map(b->bio, i);
diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
index e548b8b51322..61813d230015 100644
--- a/drivers/md/bcache/util.c
+++ b/drivers/md/bcache/util.c
@@ -249,6 +249,13 @@ uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done)
: 0;
}
+/*
+ * Generally it isn't good to access .bi_io_vec and .bi_vcnt directly,
+ * the preferred way is bio_add_page, but in this case, bch_bio_map()
+ * supposes that the bvec table is empty, so it is safe to access
+ * .bi_vcnt & .bi_io_vec in this way even after multipage bvec is
+ * supported.
+ */
void bch_bio_map(struct bio *bio, void *base)
{
size_t size = bio->bi_iter.bi_size;