On Fri, Aug 24, 2012 at 9:34 AM, Alex Elder <elder@xxxxxxxxxxx> wrote:
> Add the ability to map an rbd image read-only, by specifying either
> "read_only" or "ro" as an option on the rbd "command line."
>
> Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
> ---
> drivers/block/rbd.c | 22 ++++++++++++++++++----
> 1 file changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
> index b40f553..5e22bb5 100644
> --- a/drivers/block/rbd.c
> +++ b/drivers/block/rbd.c
> @@ -69,7 +69,8 @@
> #define DEV_NAME_LEN 32
> #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
>
> -#define RBD_NOTIFY_TIMEOUT_DEFAULT 10
> +#define RBD_NOTIFY_TIMEOUT_DEFAULT 10
> +#define RBD_READ_ONLY_DEFAULT false
>
> /*
> * block device image metadata (in-memory version)
> @@ -91,6 +92,7 @@ struct rbd_image_header {
>
> struct rbd_options {
> int notify_timeout;
> + bool read_only;
> };
>
> /*
> @@ -176,7 +178,7 @@ struct rbd_device {
> u64 snap_id; /* current snapshot id */
> /* whether the snap_id this device reads from still exists */
> bool snap_exists;
> - int read_only;
> + bool read_only;
>
> struct list_head node;
>
> @@ -351,12 +353,18 @@ enum {
> /* int args above */
> Opt_last_string,
> /* string args above */
> + Opt_read_only,
> + /* Boolean args above */
> + Opt_last_bool,
> };
>
> static match_table_t rbd_opts_tokens = {
> {Opt_notify_timeout, "notify_timeout=%d"},
> /* int args above */
> /* string args above */
> + {Opt_read_only, "read_only"},
> + {Opt_read_only, "ro"}, /* Alternate spelling */
> + /* Boolean args above */
> {-1, NULL}
> };
>
> @@ -381,6 +389,8 @@ static int parse_rbd_opts_token(char *c, void *private)
> } else if (token > Opt_last_int && token < Opt_last_string) {
> dout("got string token %d val %s\n", token,
> argstr[0].from);
> + } else if (token > Opt_last_string && token < Opt_last_bool) {
> + dout("got Boolean token %d\n", token);
> } else {
> dout("got token %d\n", token);
> }
> @@ -389,6 +399,9 @@ static int parse_rbd_opts_token(char *c, void *private)
> case Opt_notify_timeout:
> rbd_opts->notify_timeout = intval;
> break;
> + case Opt_read_only:
> + rbd_opts->read_only = !rbd_opts->read_only;
should this be a flip-flop? better have "rw" and "read_write" options
instead, or just set it to true here.
> + break;
> default:
> BUG_ON(token);
> }
> @@ -407,6 +420,7 @@ static int rbd_get_client(struct rbd_device
> *rbd_dev, const char *mon_addr,
> struct rbd_client *rbdc;
>
> rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT;
> + rbd_opts->read_only = RBD_READ_ONLY_DEFAULT;
>
> ceph_opts = ceph_parse_options(options, mon_addr,
> mon_addr + mon_addr_len,
> @@ -613,7 +627,7 @@ static int rbd_header_set_snap(struct rbd_device
> *rbd_dev, u64 *size)
> sizeof (RBD_SNAP_HEAD_NAME))) {
> rbd_dev->snap_id = CEPH_NOSNAP;
> rbd_dev->snap_exists = false;
> - rbd_dev->read_only = 0;
> + rbd_dev->read_only = rbd_dev->rbd_opts.read_only;
> if (size)
> *size = rbd_dev->header.image_size;
> } else {
> @@ -625,7 +639,7 @@ static int rbd_header_set_snap(struct rbd_device
> *rbd_dev, u64 *size)
> goto done;
> rbd_dev->snap_id = snap_id;
> rbd_dev->snap_exists = true;
> - rbd_dev->read_only = 1;
> + rbd_dev->read_only = true; /* No choice for snapshots */
> }
>
> ret = 0;
> --
> 1.7.9.5
>
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