From 0ddebc0c6c518ae42c376151e34d9d4b84443ba5 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Thu, 25 Oct 2012 23:34:41 -0500 Subject: 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 Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 77 +++++++++++++++++++++++++---------------------------- 1 file changed, 37 insertions(+), 40 deletions(-) (limited to 'drivers') diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index e83bddcca34e..68447d83288c 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -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); - 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); + 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_args; + goto err_out_mem; } - /* 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); -- cgit v1.2.3