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rbd: do all argument parsing in one place 

This patch makes rbd_add_parse_args() be the single place all
argument parsing occurs for an image map request:
    - Move the ceph_parse_options() call into that function
    - Use local variables rather than parameters to hold the list
      of monitor addresses supplied
    - Rather than returning it, pass the snapshot name (and its
      length) back via parameters
    - Have the function return a ceph_options structure pointer

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-10-25 23:34:41 -05:00
parent 78cea76e05
commit 0ddebc0c6c
1 changed files with 38 additions and 41 deletions
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79
drivers/block/rbd.c
View File

@ -2845,24 +2845,27 @@ static inline char *dup_token(const char **buf, size_t *lenp)
*
* Note: rbd_dev is assumed to have been initially zero-filled.
*/
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)
static struct ceph_options *rbd_add_parse_args(struct rbd_device *rbd_dev,
const char *buf,
char *options,
size_t options_size,
char **snap_name,
size_t *snap_name_len)
{
size_t len;
char *err_ptr = ERR_PTR(-EINVAL);
char *snap_name;
const char *mon_addrs;
size_t mon_addrs_size;
struct rbd_options rbd_opts;
struct ceph_options *ceph_opts;
struct ceph_options *err_ptr = ERR_PTR(-EINVAL);
/* The first four tokens are required */
len = next_token(&buf);
if (!len)
return err_ptr;
*mon_addrs_size = len + 1;
*mon_addrs = buf;
mon_addrs_size = len + 1;
mon_addrs = buf;
buf += len;
@ -2890,14 +2893,27 @@ static char *rbd_add_parse_args(struct rbd_device *rbd_dev,
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)
*snap_name = kmalloc(len + 1, GFP_KERNEL);
if (!*snap_name)
goto out_err;
memcpy(snap_name, buf, len);
*(snap_name + len) = '\0';
memcpy(*snap_name, buf, len);
*(*snap_name + len) = '\0';
*snap_name_len = len;
/* Initialize all rbd options to the defaults */
return snap_name;
rbd_opts.read_only = RBD_READ_ONLY_DEFAULT;
ceph_opts = ceph_parse_options(options, mon_addrs,
mon_addrs + mon_addrs_size - 1,
parse_rbd_opts_token, &rbd_opts);
/* Record the parsed rbd options */
if (!IS_ERR(ceph_opts)) {
rbd_dev->mapping.read_only = rbd_opts.read_only;
}
return ceph_opts;
out_err:
kfree(rbd_dev->image_name);
rbd_dev->image_name = NULL;
@ -3114,10 +3130,8 @@ static ssize_t rbd_add(struct bus_type *bus,
{
char *options;
struct rbd_device *rbd_dev = NULL;
const char *mon_addrs = NULL;
size_t mon_addrs_size = 0;
char *snap_name;
struct rbd_options rbd_opts;
size_t snap_name_len = 0;
struct ceph_options *ceph_opts;
struct ceph_osd_client *osdc;
int rc = -ENOMEM;
@ -3139,32 +3153,16 @@ static ssize_t rbd_add(struct bus_type *bus,
init_rwsem(&rbd_dev->header_rwsem);
/* parse add command */
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);
ceph_opts = rbd_add_parse_args(rbd_dev, buf, options, count,
&snap_name, &snap_name_len);
if (IS_ERR(ceph_opts)) {
rc = PTR_ERR(ceph_opts);
goto err_out_mem;
}
/* Initialize all rbd options to the defaults */
rbd_opts.read_only = RBD_READ_ONLY_DEFAULT;
ceph_opts = ceph_parse_options(options, mon_addrs,
mon_addrs + mon_addrs_size - 1,
parse_rbd_opts_token, &rbd_opts);
if (IS_ERR(ceph_opts)) {
rc = PTR_ERR(ceph_opts);
goto err_out_args;
}
/* Record the parsed rbd options */
rbd_dev->mapping.read_only = rbd_opts.read_only;
rc = rbd_get_client(rbd_dev, ceph_opts);
if (rc < 0)
goto err_out_opts;
goto err_out_args;
ceph_opts = NULL; /* ceph_opts now owned by rbd_dev client */
/* pick the pool */
@ -3257,10 +3255,9 @@ err_out_client:
kfree(rbd_dev->header_name);
rbd_put_client(rbd_dev);
kfree(rbd_dev->image_id);
err_out_opts:
err_out_args:
if (ceph_opts)
ceph_destroy_options(ceph_opts);
err_out_args:
kfree(rbd_dev->snap_name);
kfree(rbd_dev->image_name);
kfree(rbd_dev->pool_name);