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rbd: return snap name from rbd_add_parse_args()

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This is the first of two patches aimed at isolating the code that
sets the mapping information into a single spot.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-08-31 17:29:52 -05:00
parent 99c1f08f64
commit 3feeb89467
1 changed files with 37 additions and 35 deletions
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72
drivers/block/rbd.c
View file

@ -2477,28 +2477,31 @@ static inline char *dup_token(const char **buf, size_t *lenp)
}
/*
* This fills in the pool_name, image_name, image_name_len, snap_name,
* rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based
* on the list of monitor addresses and other options provided via
* /sys/bus/rbd/add.
* This fills in the pool_name, image_name, image_name_len, rbd_dev,
* rbd_md_name, and name fields of the given rbd_dev, based on the
* list of monitor addresses and other options provided via
* /sys/bus/rbd/add. Returns a pointer to a dynamically-allocated
* copy of the snapshot name to map if successful, or a
* pointer-coded error otherwise.
*
* Note: rbd_dev is assumed to have been initially zero-filled.
*/
static int rbd_add_parse_args(struct rbd_device *rbd_dev,
const char *buf,
const char **mon_addrs,
size_t *mon_addrs_size,
char *options,
size_t options_size)
static char *rbd_add_parse_args(struct rbd_device *rbd_dev,
const char *buf,
const char **mon_addrs,
size_t *mon_addrs_size,
char *options,
size_t options_size)
{
size_t len;
int ret;
char *err_ptr = ERR_PTR(-EINVAL);
char *snap_name;
/* The first four tokens are required */
len = next_token(&buf);
if (!len)
return -EINVAL;
return err_ptr;
*mon_addrs_size = len + 1;
*mon_addrs = buf;
@ -2506,9 +2509,9 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
len = copy_token(&buf, options, options_size);
if (!len || len >= options_size)
return -EINVAL;
return err_ptr;
ret = -ENOMEM;
err_ptr = ERR_PTR(-ENOMEM);
rbd_dev->pool_name = dup_token(&buf, NULL);
if (!rbd_dev->pool_name)
goto out_err;
@ -2526,26 +2529,21 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
goto out_err;
sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX);
/*
* The snapshot name is optional. If none is is supplied,
* we use the default value.
*/
rbd_dev->mapping.snap_name = dup_token(&buf, &len);
if (!rbd_dev->mapping.snap_name)
goto out_err;
/* Snapshot name is optional */
len = next_token(&buf);
if (!len) {
/* Replace the empty name with the default */
kfree(rbd_dev->mapping.snap_name);
rbd_dev->mapping.snap_name
= kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL);
if (!rbd_dev->mapping.snap_name)
goto out_err;
memcpy(rbd_dev->mapping.snap_name, RBD_SNAP_HEAD_NAME,
sizeof (RBD_SNAP_HEAD_NAME));
buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */
len = sizeof (RBD_SNAP_HEAD_NAME) - 1;
}
snap_name = kmalloc(len + 1, GFP_KERNEL);
if (!snap_name)
goto out_err;
memcpy(snap_name, buf, len);
*(snap_name + len) = '\0';
return 0;
dout(" SNAP_NAME is <%s>, len is %zd\n", snap_name, len);
return snap_name;
out_err:
kfree(rbd_dev->header_name);
@ -2556,7 +2554,7 @@ static int rbd_add_parse_args(struct rbd_device *rbd_dev,
kfree(rbd_dev->pool_name);
rbd_dev->pool_name = NULL;
return ret;
return err_ptr;
}
static ssize_t rbd_add(struct bus_type *bus,
@ -2569,6 +2567,7 @@ static ssize_t rbd_add(struct bus_type *bus,
size_t mon_addrs_size = 0;
struct ceph_osd_client *osdc;
int rc = -ENOMEM;
char *snap_name;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
@ -2595,10 +2594,13 @@ static ssize_t rbd_add(struct bus_type *bus,
sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id);
/* parse add command */
rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size,
options, count);
if (rc)
snap_name = rbd_add_parse_args(rbd_dev, buf,
&mon_addrs, &mon_addrs_size, options, count);
if (IS_ERR(snap_name)) {
rc = PTR_ERR(snap_name);
goto err_put_id;
}
rbd_dev->mapping.snap_name = snap_name;
rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options);
if (rc < 0)