On 07/26/2012 12:08 PM, Alex Elder wrote:
Either rbd_create_rw_ops() will succeed, or it will fail because a
memory allocation failed. Have it just return a valid pointer or
null rather than stuffing a pointer into a provided address and
returning an errno.
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
---
drivers/block/rbd.c | 70
++++++++++++++++++++++++++++-----------------------
1 file changed, 39 insertions(+), 31 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index fd91964..4d8b52c 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -789,22 +789,24 @@ err_out:
/*
* helpers for osd request op vectors.
*/
-static int rbd_create_rw_ops(struct ceph_osd_req_op **ops,
- int num_ops,
- int opcode,
- u32 payload_len)
-{
- *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1),
- GFP_NOIO);
- if (!*ops)
- return -ENOMEM;
- (*ops)[0].op = opcode;
+static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops,
+ int opcode, u32 payload_len)
+{
+ struct ceph_osd_req_op *ops;
+
+ ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO);
+ if (!ops)
+ return NULL;
+
+ ops[0].op = opcode;
+
/*
* op extent offset and length will be set later on
* in calc_raw_layout()
*/
- (*ops)[0].payload_len = payload_len;
- return 0;
+ ops[0].payload_len = payload_len;
+
+ return ops;
}
static void rbd_destroy_ops(struct ceph_osd_req_op *ops)
@@ -1039,8 +1041,9 @@ static int rbd_req_sync_op(struct rbd_device *rbd_dev,
if (!orig_ops) {
payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0);
- ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len);
- if (ret < 0)
+ ret = -ENOMEM;
+ ops = rbd_create_rw_ops(1, opcode, payload_len);
+ if (!ops)
goto done;
if ((flags & CEPH_OSD_FLAG_WRITE) && buf) {
@@ -1103,8 +1106,9 @@ static int rbd_do_op(struct request *rq,
payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0);
- ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len);
- if (ret < 0)
+ ret = -ENOMEM;
+ ops = rbd_create_rw_ops(1, opcode, payload_len);
+ if (!ops)
goto done;
/* we've taken care of segment sizes earlier when we
@@ -1190,9 +1194,9 @@ static int rbd_req_sync_notify_ack(struct
rbd_device *rbd_dev,
struct ceph_osd_req_op *ops;
int ret;
- ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0);
- if (ret < 0)
- return ret;
+ ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0);
+ if (!ops)
+ return -ENOMEM;
ops[0].watch.ver = cpu_to_le64(ver);
ops[0].watch.cookie = notify_id;
@@ -1239,10 +1243,11 @@ static int rbd_req_sync_watch(struct rbd_device
*rbd_dev)
{
struct ceph_osd_req_op *ops;
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
+ int ret;
- int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0);
- if (ret < 0)
- return ret;
+ ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0);
+ if (!ops)
+ return -ENOMEM;
ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0,
(void *)rbd_dev, &rbd_dev->watch_event);
@@ -1282,10 +1287,11 @@ fail:
static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev)
{
struct ceph_osd_req_op *ops;
+ int ret;
- int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0);
- if (ret < 0)
- return ret;
+ ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0);
+ if (!ops)
+ return -ENOMEM;
ops[0].watch.ver = 0;
ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
@@ -1332,9 +1338,9 @@ static int rbd_req_sync_notify(struct rbd_device
*rbd_dev)
int payload_len = sizeof(u32) + sizeof(u32);
int ret;
- ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len);
- if (ret < 0)
- return ret;
+ ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY, payload_len);
+ if (!ops)
+ return -ENOMEM;
info.rbd_dev = rbd_dev;
@@ -1385,10 +1391,12 @@ static int rbd_req_sync_exec(struct rbd_device
*rbd_dev,
struct ceph_osd_req_op *ops;
int class_name_len = strlen(class_name);
int method_name_len = strlen(method_name);
- int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL,
+ int ret;
+
+ ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL,
class_name_len + method_name_len + len);
- if (ret < 0)
- return ret;
+ if (!ops)
+ return -ENOMEM;
ops[0].cls.class_name = class_name;
ops[0].cls.class_len = (__u8) class_name_len;
--
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