rbd: pass and populate rbd_options structure

Have the caller pass the address of an rbd_options structure to
rbd_add_parse_args(), to be initialized with the information
gleaned as a result of the parse.

I know, this is another near-reversal of a recent change...

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

1 files changed, 19 insertions, 11 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index ae16cf615f02..338cfadad63f 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2842,15 +2842,16 @@ static inline char *dup_token(const char **buf, size_t *lenp)
  * Note: rbd_dev is assumed to have been initially zero-filled.
  */
 static struct ceph_options *rbd_add_parse_args(struct rbd_device *rbd_dev,
-                                                const char *buf)
+                                                const char *buf,
+                                                struct rbd_options **opts)
 {
         size_t len;
         const char *mon_addrs;
         size_t mon_addrs_size;
         char *options;
         struct ceph_options *err_ptr = ERR_PTR(-EINVAL);
-        struct rbd_options rbd_opts;
         struct ceph_options *ceph_opts;
+        struct rbd_options *rbd_opts = NULL;
 
         /* The first four tokens are required */
 
@@ -2899,17 +2900,17 @@ static struct ceph_options *rbd_add_parse_args(struct rbd_device *rbd_dev,
 
         /* Initialize all rbd options to the defaults */
 
-        rbd_opts.read_only = RBD_READ_ONLY_DEFAULT;
+        rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL);
+        if (!rbd_opts)
+                goto out_mem;
+
+        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);
+                                        parse_rbd_opts_token, rbd_opts);
         kfree(options);
-
-        /* Record the parsed rbd options */
-
-        if (!IS_ERR(ceph_opts))
-                rbd_dev->mapping.read_only = rbd_opts.read_only;
+        *opts = rbd_opts;
 
         return ceph_opts;
 out_mem:
@@ -3131,6 +3132,7 @@ static ssize_t rbd_add(struct bus_type *bus,
 {
         struct rbd_device *rbd_dev = NULL;
         struct ceph_options *ceph_opts;
+        struct rbd_options *rbd_opts = NULL;
         struct ceph_osd_client *osdc;
         int rc = -ENOMEM;
 
@@ -3139,7 +3141,7 @@ static ssize_t rbd_add(struct bus_type *bus,
 
         rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);
         if (!rbd_dev)
-                goto err_out_mem;
+                return -ENOMEM;
 
         /* static rbd_device initialization */
         spin_lock_init(&rbd_dev->lock);
@@ -3148,11 +3150,12 @@ static ssize_t rbd_add(struct bus_type *bus,
         init_rwsem(&rbd_dev->header_rwsem);
 
         /* parse add command */
-        ceph_opts = rbd_add_parse_args(rbd_dev, buf);
+        ceph_opts = rbd_add_parse_args(rbd_dev, buf, &rbd_opts);
         if (IS_ERR(ceph_opts)) {
                 rc = PTR_ERR(ceph_opts);
                 goto err_out_mem;
         }
+        rbd_dev->mapping.read_only = rbd_opts->read_only;
 
         rc = rbd_get_client(rbd_dev, ceph_opts);
         if (rc < 0)
@@ -3219,6 +3222,8 @@ static ssize_t rbd_add(struct bus_type *bus,
         if (rc)
                 goto err_out_bus;
 
+        kfree(rbd_opts);
+
         /* Everything's ready.  Announce the disk to the world. */
 
         add_disk(rbd_dev->disk);
@@ -3232,6 +3237,8 @@ err_out_bus:
         /* this will also clean up rest of rbd_dev stuff */
 
         rbd_bus_del_dev(rbd_dev);
+        kfree(rbd_opts);
+
         return rc;
 
 err_out_disk:
@@ -3254,6 +3261,7 @@ err_out_args:
         kfree(rbd_dev->snap_name);
         kfree(rbd_dev->image_name);
         kfree(rbd_dev->pool_name);
+        kfree(rbd_opts);
 err_out_mem:
         kfree(rbd_dev);