On 07/26/2012 12:08 PM, Alex Elder wrote:
It's not obvious whether the snapshot pointer whose address is
provided to __rbd_add_snap_dev() will be assigned by that function.
Change it to return the snapshot, or a pointer-coded errno in the
event of a failure.
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
---
drivers/block/rbd.c | 37 ++++++++++++++++++++++---------------
1 file changed, 22 insertions(+), 15 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index fd5f3038..fd91964 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2025,15 +2025,21 @@ static int rbd_register_snap_dev(struct rbd_snap
*snap,
return ret;
}
-static int __rbd_add_snap_dev(struct rbd_device *rbd_dev,
- int i, const char *name,
- struct rbd_snap **snapp)
+static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev,
+ int i, const char *name)
{
+ struct rbd_snap *snap;
int ret;
- struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL);
+
+ snap = kzalloc(sizeof (*snap), GFP_KERNEL);
if (!snap)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
+
+ ret = -ENOMEM;
snap->name = kstrdup(name, GFP_KERNEL);
+ if (!snap->name)
+ goto err;
+
snap->size = rbd_dev->header.snap_sizes[i];
snap->id = rbd_dev->header.snapc->snaps[i];
if (device_is_registered(&rbd_dev->dev)) {
@@ -2041,12 +2047,14 @@ static int __rbd_add_snap_dev(struct rbd_device
*rbd_dev,
if (ret < 0)
goto err;
}
- *snapp = snap;
- return 0;
+
+ return snap;
+
err:
kfree(snap->name);
kfree(snap);
- return ret;
+
+ return ERR_PTR(ret);
}
/*
@@ -2079,7 +2087,6 @@ static int __rbd_init_snaps_header(struct
rbd_device *rbd_dev)
const char *name, *first_name;
int i = rbd_dev->header.total_snaps;
struct rbd_snap *snap, *old_snap = NULL;
- int ret;
struct list_head *p, *n;
first_name = rbd_dev->header.snap_names;
@@ -2122,9 +2129,9 @@ static int __rbd_init_snaps_header(struct
rbd_device *rbd_dev)
if (cur_id >= old_snap->id)
break;
/* a new snapshot */
- ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap);
- if (ret < 0)
- return ret;
+ snap = __rbd_add_snap_dev(rbd_dev, i - 1, name);
+ if (IS_ERR(snap))
+ return PTR_ERR(snap);
/* note that we add it backward so using n and not p */
list_add(&snap->node, n);
@@ -2138,9 +2145,9 @@ static int __rbd_init_snaps_header(struct
rbd_device *rbd_dev)
WARN_ON(1);
return -EINVAL;
}
- ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap);
- if (ret < 0)
- return ret;
+ snap = __rbd_add_snap_dev(rbd_dev, i - 1, name);
+ if (IS_ERR(snap))
+ return PTR_ERR(snap);
list_add(&snap->node, &rbd_dev->snaps);
}
--
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