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rbd: have __rbd_add_snap_dev() return a pointer

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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@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-07-10 20:30:10 -05:00 committed by Sage Weil
parent 6139919133
commit 4e891e0af0
1 changed files with 22 additions and 15 deletions
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37
drivers/block/rbd.c
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@ -2029,15 +2029,21 @@ 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)) {
@ -2045,12 +2051,14 @@ 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);
}
/*
@ -2083,7 +2091,6 @@ 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;
@ -2126,9 +2133,9 @@ 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);
@ -2142,9 +2149,9 @@ 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);
}