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rbd: encapsulate argument parsing for rbd_add()

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Move the code that parses the arguments provided to rbd_add() (which
are supplied via /sys/bus/rbd/add) into a separate function.

Also rename the "mon_dev_name" variable in rbd_add() to be
"mon_addrs".   The variable represents a list of one or more
comma-separated monitor IP addresses, each with an optional port
number.  I think "mon_addrs" captures that notion a little better.

Signed-off-by: Alex Elder <elder@dreamhost.com>
This commit is contained in:
Alex Elder 2012-02-02 08:13:30 -06:00
parent 27cc25943f
commit a725f65e52
1 changed files with 43 additions and 27 deletions
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70
drivers/block/rbd.c
View file

@ -2220,12 +2220,43 @@ static void rbd_id_put(struct rbd_device *rbd_dev)
atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id);
} }
/*
* This fills in the pool_name, obj, obj_len, snap_name, obj_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.
*/
static int rbd_add_parse_args(struct rbd_device *rbd_dev,
const char *buf,
char *mon_addrs,
char *options)
{
if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s "
"%" __stringify(RBD_MAX_OPT_LEN) "s "
"%" __stringify(RBD_MAX_POOL_NAME_LEN) "s "
"%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s"
"%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s",
mon_addrs, options, rbd_dev->pool_name,
rbd_dev->obj, rbd_dev->snap_name) < 4)
return -EINVAL;
if (rbd_dev->snap_name[0] == 0)
memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME,
sizeof (RBD_SNAP_HEAD_NAME));
rbd_dev->obj_len = strlen(rbd_dev->obj);
snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s",
rbd_dev->obj, RBD_SUFFIX);
return 0;
}
static ssize_t rbd_add(struct bus_type *bus, static ssize_t rbd_add(struct bus_type *bus,
const char *buf, const char *buf,
size_t count) size_t count)
{ {
struct rbd_device *rbd_dev; struct rbd_device *rbd_dev;
char *mon_dev_name = NULL; char *mon_addrs = NULL;
char *options = NULL; char *options = NULL;
struct ceph_osd_client *osdc; struct ceph_osd_client *osdc;
int rc = -ENOMEM; int rc = -ENOMEM;
@ -2236,8 +2267,8 @@ static ssize_t rbd_add(struct bus_type *bus,
rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);
if (!rbd_dev) if (!rbd_dev)
goto err_nomem; goto err_nomem;
mon_dev_name = kmalloc(count, GFP_KERNEL); mon_addrs = kmalloc(count, GFP_KERNEL);
if (!mon_dev_name) if (!mon_addrs)
goto err_nomem; goto err_nomem;
options = kmalloc(count, GFP_KERNEL); options = kmalloc(count, GFP_KERNEL);
if (!options) if (!options)
@ -2253,30 +2284,15 @@ static ssize_t rbd_add(struct bus_type *bus,
/* generate unique id: find highest unique id, add one */ /* generate unique id: find highest unique id, add one */
rbd_id_get(rbd_dev); rbd_id_get(rbd_dev);
/* parse add command */ /* Fill in the device name, now that we have its id. */
if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s "
"%" __stringify(RBD_MAX_OPT_LEN) "s "
"%" __stringify(RBD_MAX_POOL_NAME_LEN) "s "
"%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s"
"%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s",
mon_dev_name, options, rbd_dev->pool_name,
rbd_dev->obj, rbd_dev->snap_name) < 4) {
rc = -EINVAL;
goto err_put_id;
}
if (rbd_dev->snap_name[0] == 0)
memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME,
sizeof (RBD_SNAP_HEAD_NAME));
rbd_dev->obj_len = strlen(rbd_dev->obj);
snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s",
rbd_dev->obj, RBD_SUFFIX);
/* initialize rest of new object */
snprintf(rbd_dev->name, DEV_NAME_LEN, RBD_DRV_NAME "%d", rbd_dev->id); snprintf(rbd_dev->name, DEV_NAME_LEN, RBD_DRV_NAME "%d", rbd_dev->id);
rbd_dev->rbd_client = rbd_get_client(mon_dev_name, options); /* parse add command */
rc = rbd_add_parse_args(rbd_dev, buf, mon_addrs, options);
if (rc)
goto err_put_id;
rbd_dev->rbd_client = rbd_get_client(mon_addrs, options);
if (IS_ERR(rbd_dev->rbd_client)) { if (IS_ERR(rbd_dev->rbd_client)) {
rc = PTR_ERR(rbd_dev->rbd_client); rc = PTR_ERR(rbd_dev->rbd_client);
goto err_put_id; goto err_put_id;
@ -2317,7 +2333,7 @@ err_out_bus:
rbd_bus_del_dev(rbd_dev); rbd_bus_del_dev(rbd_dev);
kfree(options); kfree(options);
kfree(mon_dev_name); kfree(mon_addrs);
return rc; return rc;
err_out_blkdev: err_out_blkdev:
@ -2328,7 +2344,7 @@ err_put_id:
rbd_id_put(rbd_dev); rbd_id_put(rbd_dev);
err_nomem: err_nomem:
kfree(options); kfree(options);
kfree(mon_dev_name); kfree(mon_addrs);
kfree(rbd_dev); kfree(rbd_dev);
dout("Error adding device %s\n", buf); dout("Error adding device %s\n", buf);