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rbd: send snapshot context with writes

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Sending the right snapshot context with each write is required for
snapshots to work. Due to the ordering of calls, the snapshot context
is never set for any requests. This causes writes to the current
version of the image to be reflected in all snapshots, which are
supposed to be read-only.

This happens because rbd_osd_req_format_write() sets the snapshot
context based on obj_request->img_request. At this point, however,
obj_request->img_request has not been set yet, to the snapshot context
is set to NULL. Fix this by moving rbd_img_obj_request_add(), which
sets obj_request->img_request, before the osd request formatting
calls.

This resolves:
    http://tracker.ceph.com/issues/5465

Reported-by: Karol Jurak <karol.jurak@gmail.com>
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Josh Durgin 2013-06-26 12:56:17 -07:00 committed by Sage Weil
parent 1617e40c1e
commit d2d1f17a0d
1 changed files with 5 additions and 1 deletions
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6
drivers/block/rbd.c
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@ -2254,13 +2254,17 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
obj_request->pages, length,
offset & ~PAGE_MASK, false, false);
/*
* set obj_request->img_request before formatting
* the osd_request so that it gets the right snapc
*/
rbd_img_obj_request_add(img_request, obj_request);
if (write_request)
rbd_osd_req_format_write(obj_request);
else
rbd_osd_req_format_read(obj_request);
obj_request->img_offset = img_offset;
rbd_img_obj_request_add(img_request, obj_request);
img_offset += length;
resid -= length;