On 03/03/2014 09:38 AM, Ilya Dryomov wrote:
Doing rbd_obj_request_put() in rbd_img_request_fill() error paths is
not only insufficient, but also triggers an rbd_assert() in
rbd_obj_request_destroy():
Assertion failure in rbd_obj_request_destroy() at line 1867:
rbd_assert(obj_request->img_request == NULL);
Does this have a tracker entry separate from 7327? (I
didn't look, just curious.)
rbd_img_obj_request_add() adds obj_requests to the img_request, the
opposite is rbd_img_obj_request_del(). Use it.h
This is the main bug here, and this is the right fix.
While at it, commit 03507db631c94 ("rbd: fix buffer size for writes to
images with snapshots") moved the call to rbd_img_obj_request_add() up,
making the out_partial label bogus. Remove it.
Yes, this is also correct, and is a bug fix. Since it's a distinct
bug *maybe* you could commit it separately, but I don't really think
it's that important.
Very nice.
Reviewed-by: Alex Elder <[email protected]>
Fixes: http://tracker.ceph.com/issues/7327
Signed-off-by: Ilya Dryomov <[email protected]>
---
drivers/block/rbd.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index b365e0dfccb6..53d492e83586 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2191,6 +2191,7 @@ static int rbd_img_request_fill(struct rbd_img_request
*img_request,
rbd_segment_name_free(object_name);
if (!obj_request)
goto out_unwind;
+
/*
* set obj_request->img_request before creating the
* osd_request so that it gets the right snapc
@@ -2208,7 +2209,7 @@ static int rbd_img_request_fill(struct rbd_img_request
*img_request,
clone_size,
GFP_ATOMIC);
if (!obj_request->bio_list)
- goto out_partial;
+ goto out_unwind;
} else {
unsigned int page_count;
@@ -2223,7 +2224,7 @@ static int rbd_img_request_fill(struct rbd_img_request
*img_request,
osd_req = rbd_osd_req_create(rbd_dev, write_request,
obj_request);
if (!osd_req)
- goto out_partial;
+ goto out_unwind;
obj_request->osd_req = osd_req;
obj_request->callback = rbd_img_obj_callback;
@@ -2250,11 +2251,9 @@ static int rbd_img_request_fill(struct rbd_img_request
*img_request,
return 0;
-out_partial:
- rbd_obj_request_put(obj_request);
out_unwind:
for_each_obj_request_safe(img_request, obj_request, next_obj_request)
- rbd_obj_request_put(obj_request);
+ rbd_img_obj_request_del(img_request, obj_request);
return -ENOMEM;
}
--
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