From cc0538b62c839c2df7b9f8378bb37e3b35faa608 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Fri, 10 Aug 2012 13:12:07 -0700 Subject: rbd: add read_only rbd map option 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." Also allow the inverse to be explicitly specified using "read_write" or "rw". Signed-off-by: Alex Elder Reviewed-by: Yehuda Sadeh --- drivers/block/rbd.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 839ab730a1f3..2db51cef9560 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 +353,21 @@ enum { /* int args above */ Opt_last_string, /* string args above */ + Opt_read_only, + Opt_read_write, + /* 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 */ + {Opt_read_write, "read_write"}, + {Opt_read_write, "rw"}, /* Alternate spelling */ + /* Boolean args above */ {-1, NULL} }; @@ -381,6 +392,8 @@ 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 +402,12 @@ 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 = true; + break; + case Opt_read_write: + rbd_opts->read_only = false; + break; default: BUG_ON(token); } @@ -407,6 +426,7 @@ 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, @@ -620,7 +640,7 @@ 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 { @@ -632,7 +652,7 @@ 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; -- cgit v1.2.2