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authorAlex Elder <elder@inktank.com>2013-02-20 21:59:33 -0600
committerAlex Elder <elder@inktank.com>2013-02-25 15:36:36 -0600
commit4dda41d3d76747414586a4bad5615b550e0986b1 (patch)
tree9a2f3cc8d6071fa2d242de8e6a36231e1ba6a902 /drivers/block
parent92a49fb0f79f3300e6e50ddf56238e70678e4202 (diff)
rbd: ignore zero-length requests
The old request code simply ignored zero-length requests. We should still operate that same way to avoid any changes in behavior. We can implement handling for special zero-length requests separately (see http://tracker.ceph.com/issues/4236). Add some assertions based on this new constraint. This resolves: http://tracker.ceph.com/issues/4237 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/rbd.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index b0eea3eaee9..3cc003b2661 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1560,6 +1560,7 @@ static int rbd_img_request_fill_bio(struct rbd_img_request *img_request,
image_offset = img_request->offset;
rbd_assert(image_offset == bio_list->bi_sector << SECTOR_SHIFT);
resid = img_request->length;
+ rbd_assert(resid > 0);
while (resid) {
const char *object_name;
unsigned int clone_size;
@@ -1627,8 +1628,10 @@ static void rbd_img_obj_callback(struct rbd_obj_request *obj_request)
bool more = true;
img_request = obj_request->img_request;
+
rbd_assert(img_request != NULL);
rbd_assert(img_request->rq != NULL);
+ rbd_assert(img_request->obj_request_count > 0);
rbd_assert(which != BAD_WHICH);
rbd_assert(which < img_request->obj_request_count);
rbd_assert(which >= img_request->next_completion);
@@ -1918,6 +1921,19 @@ static void rbd_request_fn(struct request_queue *q)
/* Ignore any non-FS requests that filter through. */
if (rq->cmd_type != REQ_TYPE_FS) {
+ dout("%s: non-fs request type %d\n", __func__,
+ (int) rq->cmd_type);
+ __blk_end_request_all(rq, 0);
+ continue;
+ }
+
+ /* Ignore/skip any zero-length requests */
+
+ offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT;
+ length = (u64) blk_rq_bytes(rq);
+
+ if (!length) {
+ dout("%s: zero-length request\n", __func__);
__blk_end_request_all(rq, 0);
continue;
}
@@ -1947,9 +1963,6 @@ static void rbd_request_fn(struct request_queue *q)
goto end_request;
}
- offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT;
- length = (u64) blk_rq_bytes(rq);
-
result = -EINVAL;
if (WARN_ON(offset && length > U64_MAX - offset + 1))
goto end_request; /* Shouldn't happen */