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rbd: don't leak rbd_req on synchronous requests 

When rbd_do_request() is called it allocates and populates an
rbd_req structure to hold information about the osd request to be
sent.  This is done for the benefit of the callback function (in
particular, rbd_req_cb()), which uses this in processing when
the request completes.

Synchronous requests provide no callback function, in which case
rbd_do_request() waits for the request to complete before returning.
This case is not handling the needed free of the rbd_req structure
like it should, so it is getting leaked.

Note however that the synchronous case has no need for the rbd_req
structure at all.  So rather than simply freeing this structure for
synchronous requests, just don't allocate it to begin with.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-11-30 09:59:47 -06:00
parent 907703d050
commit 2e53c6c379
1 changed files with 26 additions and 26 deletions
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52
drivers/block/rbd.c
View File

@ -1113,20 +1113,11 @@ static int rbd_do_request(struct request *rq,
struct ceph_osd_request **linger_req,
u64 *ver)
{
struct ceph_osd_request *osd_req;
int ret;
struct timespec mtime = CURRENT_TIME;
struct rbd_request *rbd_req;
struct ceph_osd_client *osdc;
rbd_req = kzalloc(sizeof(*rbd_req), GFP_NOIO);
if (!rbd_req)
return -ENOMEM;
if (coll) {
rbd_req->coll = coll;
rbd_req->coll_index = coll_index;
}
struct ceph_osd_request *osd_req;
struct rbd_request *rbd_req = NULL;
struct timespec mtime = CURRENT_TIME;
int ret;
dout("rbd_do_request object_name=%s ofs=%llu len=%llu coll=%p[%d]\n",
object_name, (unsigned long long) ofs,
@ -1134,10 +1125,8 @@ static int rbd_do_request(struct request *rq,
osdc = &rbd_dev->rbd_client->client->osdc;
osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_NOIO);
if (!osd_req) {
ret = -ENOMEM;
goto done_pages;
}
if (!osd_req)
return -ENOMEM;
osd_req->r_flags = flags;
osd_req->r_pages = pages;
@ -1145,13 +1134,22 @@ static int rbd_do_request(struct request *rq,
osd_req->r_bio = bio;
bio_get(osd_req->r_bio);
}
if (rbd_cb) {
ret = -ENOMEM;
rbd_req = kmalloc(sizeof(*rbd_req), GFP_NOIO);
if (!rbd_req)
goto done_osd_req;
rbd_req->rq = rq;
rbd_req->bio = bio;
rbd_req->pages = pages;
rbd_req->len = len;
rbd_req->coll = coll;
rbd_req->coll_index = coll ? coll_index : 0;
}
osd_req->r_callback = rbd_cb;
rbd_req->rq = rq;
rbd_req->bio = bio;
rbd_req->pages = pages;
rbd_req->len = len;
osd_req->r_priv = rbd_req;
strncpy(osd_req->r_oid, object_name, sizeof(osd_req->r_oid));
@ -1193,10 +1191,12 @@ static int rbd_do_request(struct request *rq,
return ret;
done_err:
bio_chain_put(rbd_req->bio);
ceph_osdc_put_request(osd_req);
done_pages:
if (bio)
bio_chain_put(osd_req->r_bio);
kfree(rbd_req);
done_osd_req:
ceph_osdc_put_request(osd_req);
return ret;
}