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rbd: use watch/notify for changes in rbd header
Send notifications when we change the rbd header (e.g. create a snapshot) and wait for such notifications. This allows synchronizing the snapshot creation between different rbd clients/rools. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Yehuda Sadeh
Sage Weil
parent
a40c4f10e3
commit
59c2be1e4d
@ -31,6 +31,7 @@
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#include <linux/ceph/osd_client.h>
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#include <linux/ceph/mon_client.h>
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#include <linux/ceph/decode.h>
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#include <linux/parser.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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@ -54,6 +55,8 @@
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#define DEV_NAME_LEN 32
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#define RBD_NOTIFY_TIMEOUT_DEFAULT 10
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/*
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* block device image metadata (in-memory version)
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*/
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@ -71,6 +74,12 @@ struct rbd_image_header {
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char *snap_names;
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u64 *snap_sizes;
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u64 obj_version;
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};
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struct rbd_options {
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int notify_timeout;
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};
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/*
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@ -78,6 +87,7 @@ struct rbd_image_header {
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*/
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struct rbd_client {
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struct ceph_client *client;
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struct rbd_options *rbd_opts;
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struct kref kref;
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struct list_head node;
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};
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@ -124,6 +134,9 @@ struct rbd_device {
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char pool_name[RBD_MAX_POOL_NAME_LEN];
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int poolid;
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struct ceph_osd_event *watch_event;
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struct ceph_osd_request *watch_request;
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char snap_name[RBD_MAX_SNAP_NAME_LEN];
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u32 cur_snap; /* index+1 of current snapshot within snap context
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0 - for the head */
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@ -177,6 +190,8 @@ static void rbd_put_dev(struct rbd_device *rbd_dev)
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put_device(&rbd_dev->dev);
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}
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static int __rbd_update_snaps(struct rbd_device *rbd_dev);
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static int rbd_open(struct block_device *bdev, fmode_t mode)
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{
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struct gendisk *disk = bdev->bd_disk;
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@ -211,7 +226,8 @@ static const struct block_device_operations rbd_bd_ops = {
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* Initialize an rbd client instance.
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* We own *opt.
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*/
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static struct rbd_client *rbd_client_create(struct ceph_options *opt)
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static struct rbd_client *rbd_client_create(struct ceph_options *opt,
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struct rbd_options *rbd_opts)
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{
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struct rbd_client *rbdc;
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int ret = -ENOMEM;
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@ -233,6 +249,8 @@ static struct rbd_client *rbd_client_create(struct ceph_options *opt)
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if (ret < 0)
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goto out_err;
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rbdc->rbd_opts = rbd_opts;
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spin_lock(&node_lock);
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list_add_tail(&rbdc->node, &rbd_client_list);
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spin_unlock(&node_lock);
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@ -266,6 +284,59 @@ static struct rbd_client *__rbd_client_find(struct ceph_options *opt)
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return NULL;
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}
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/*
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* mount options
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*/
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enum {
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Opt_notify_timeout,
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Opt_last_int,
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/* int args above */
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Opt_last_string,
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/* string args above */
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};
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static match_table_t rbdopt_tokens = {
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{Opt_notify_timeout, "notify_timeout=%d"},
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/* int args above */
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/* string args above */
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{-1, NULL}
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};
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static int parse_rbd_opts_token(char *c, void *private)
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{
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struct rbd_options *rbdopt = private;
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substring_t argstr[MAX_OPT_ARGS];
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int token, intval, ret;
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token = match_token((char *)c, rbdopt_tokens, argstr);
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if (token < 0)
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return -EINVAL;
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if (token < Opt_last_int) {
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ret = match_int(&argstr[0], &intval);
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if (ret < 0) {
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pr_err("bad mount option arg (not int) "
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"at '%s'\n", c);
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return ret;
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}
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dout("got int token %d val %d\n", token, intval);
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} else if (token > Opt_last_int && token < Opt_last_string) {
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dout("got string token %d val %s\n", token,
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argstr[0].from);
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} else {
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dout("got token %d\n", token);
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}
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switch (token) {
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case Opt_notify_timeout:
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rbdopt->notify_timeout = intval;
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break;
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default:
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BUG_ON(token);
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}
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return 0;
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}
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/*
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* Get a ceph client with specific addr and configuration, if one does
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* not exist create it.
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@ -276,11 +347,18 @@ static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr,
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struct rbd_client *rbdc;
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struct ceph_options *opt;
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int ret;
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struct rbd_options *rbd_opts;
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rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL);
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if (!rbd_opts)
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return -ENOMEM;
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rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT;
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ret = ceph_parse_options(&opt, options, mon_addr,
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mon_addr + strlen(mon_addr), NULL, NULL);
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mon_addr + strlen(mon_addr), parse_rbd_opts_token, rbd_opts);
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if (ret < 0)
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return ret;
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goto done_err;
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spin_lock(&node_lock);
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rbdc = __rbd_client_find(opt);
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@ -296,13 +374,18 @@ static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr,
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}
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spin_unlock(&node_lock);
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rbdc = rbd_client_create(opt);
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if (IS_ERR(rbdc))
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return PTR_ERR(rbdc);
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rbdc = rbd_client_create(opt, rbd_opts);
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if (IS_ERR(rbdc)) {
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ret = PTR_ERR(rbdc);
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goto done_err;
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}
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rbd_dev->rbd_client = rbdc;
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rbd_dev->client = rbdc->client;
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return 0;
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done_err:
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kfree(rbd_opts);
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return ret;
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}
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/*
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@ -318,6 +401,7 @@ static void rbd_client_release(struct kref *kref)
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spin_unlock(&node_lock);
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ceph_destroy_client(rbdc->client);
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kfree(rbdc->rbd_opts);
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kfree(rbdc);
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}
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@ -666,7 +750,9 @@ static int rbd_do_request(struct request *rq,
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struct ceph_osd_req_op *ops,
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int num_reply,
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void (*rbd_cb)(struct ceph_osd_request *req,
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struct ceph_msg *msg))
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struct ceph_msg *msg),
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struct ceph_osd_request **linger_req,
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u64 *ver)
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{
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struct ceph_osd_request *req;
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struct ceph_file_layout *layout;
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@ -729,12 +815,20 @@ static int rbd_do_request(struct request *rq,
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req->r_oid, req->r_oid_len);
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up_read(&header->snap_rwsem);
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if (linger_req) {
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ceph_osdc_set_request_linger(&dev->client->osdc, req);
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*linger_req = req;
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}
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ret = ceph_osdc_start_request(&dev->client->osdc, req, false);
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if (ret < 0)
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goto done_err;
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if (!rbd_cb) {
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ret = ceph_osdc_wait_request(&dev->client->osdc, req);
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if (ver)
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*ver = le64_to_cpu(req->r_reassert_version.version);
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dout("reassert_ver=%lld\n", le64_to_cpu(req->r_reassert_version.version));
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ceph_osdc_put_request(req);
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}
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return ret;
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@ -789,6 +883,11 @@ static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
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kfree(req_data);
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}
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static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
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{
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ceph_osdc_put_request(req);
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}
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/*
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* Do a synchronous ceph osd operation
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*/
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@ -801,7 +900,9 @@ static int rbd_req_sync_op(struct rbd_device *dev,
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int num_reply,
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const char *obj,
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u64 ofs, u64 len,
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char *buf)
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char *buf,
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struct ceph_osd_request **linger_req,
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u64 *ver)
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{
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int ret;
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struct page **pages;
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@ -833,7 +934,8 @@ static int rbd_req_sync_op(struct rbd_device *dev,
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flags,
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ops,
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2,
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NULL);
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NULL,
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linger_req, ver);
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if (ret < 0)
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goto done_ops;
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@ -893,7 +995,7 @@ static int rbd_do_op(struct request *rq,
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flags,
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ops,
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num_reply,
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rbd_req_cb);
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rbd_req_cb, 0, NULL);
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done:
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kfree(seg_name);
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return ret;
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@ -940,18 +1042,174 @@ static int rbd_req_sync_read(struct rbd_device *dev,
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u64 snapid,
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const char *obj,
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u64 ofs, u64 len,
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char *buf)
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char *buf,
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u64 *ver)
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{
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return rbd_req_sync_op(dev, NULL,
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(snapid ? snapid : CEPH_NOSNAP),
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CEPH_OSD_OP_READ,
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CEPH_OSD_FLAG_READ,
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NULL,
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1, obj, ofs, len, buf);
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1, obj, ofs, len, buf, NULL, ver);
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}
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/*
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* Request sync osd read
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* Request sync osd watch
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*/
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static int rbd_req_sync_notify_ack(struct rbd_device *dev,
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u64 ver,
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u64 notify_id,
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const char *obj)
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{
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struct ceph_osd_req_op *ops;
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struct page **pages = NULL;
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int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0);
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if (ret < 0)
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return ret;
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ops[0].watch.ver = cpu_to_le64(dev->header.obj_version);
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ops[0].watch.cookie = notify_id;
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ops[0].watch.flag = 0;
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ret = rbd_do_request(NULL, dev, NULL, CEPH_NOSNAP,
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obj, 0, 0, NULL,
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pages, 0,
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CEPH_OSD_FLAG_READ,
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ops,
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1,
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rbd_simple_req_cb, 0, NULL);
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rbd_destroy_ops(ops);
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return ret;
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}
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static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
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{
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struct rbd_device *dev = (struct rbd_device *)data;
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if (!dev)
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return;
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dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name,
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notify_id, (int)opcode);
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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__rbd_update_snaps(dev);
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mutex_unlock(&ctl_mutex);
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rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name);
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}
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/*
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* Request sync osd watch
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*/
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static int rbd_req_sync_watch(struct rbd_device *dev,
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const char *obj,
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u64 ver)
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{
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struct ceph_osd_req_op *ops;
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struct ceph_osd_client *osdc = &dev->client->osdc;
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int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0);
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if (ret < 0)
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return ret;
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ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0,
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(void *)dev, &dev->watch_event);
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if (ret < 0)
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goto fail;
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ops[0].watch.ver = cpu_to_le64(ver);
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ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie);
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ops[0].watch.flag = 1;
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ret = rbd_req_sync_op(dev, NULL,
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CEPH_NOSNAP,
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0,
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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ops,
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1, obj, 0, 0, NULL,
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&dev->watch_request, NULL);
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if (ret < 0)
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goto fail_event;
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rbd_destroy_ops(ops);
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return 0;
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fail_event:
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ceph_osdc_cancel_event(dev->watch_event);
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dev->watch_event = NULL;
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fail:
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rbd_destroy_ops(ops);
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return ret;
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}
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struct rbd_notify_info {
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struct rbd_device *dev;
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};
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static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
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{
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struct rbd_device *dev = (struct rbd_device *)data;
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if (!dev)
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return;
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dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name,
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notify_id, (int)opcode);
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}
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/*
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* Request sync osd notify
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*/
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static int rbd_req_sync_notify(struct rbd_device *dev,
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const char *obj)
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{
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struct ceph_osd_req_op *ops;
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struct ceph_osd_client *osdc = &dev->client->osdc;
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struct ceph_osd_event *event;
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struct rbd_notify_info info;
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int payload_len = sizeof(u32) + sizeof(u32);
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int ret;
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ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len);
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if (ret < 0)
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return ret;
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info.dev = dev;
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ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1,
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(void *)&info, &event);
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if (ret < 0)
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goto fail;
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ops[0].watch.ver = 1;
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ops[0].watch.flag = 1;
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ops[0].watch.cookie = event->cookie;
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ops[0].watch.prot_ver = RADOS_NOTIFY_VER;
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ops[0].watch.timeout = 12;
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ret = rbd_req_sync_op(dev, NULL,
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CEPH_NOSNAP,
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0,
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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ops,
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1, obj, 0, 0, NULL, NULL, NULL);
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if (ret < 0)
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goto fail_event;
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ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT);
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dout("ceph_osdc_wait_event returned %d\n", ret);
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rbd_destroy_ops(ops);
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return 0;
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fail_event:
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ceph_osdc_cancel_event(event);
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fail:
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rbd_destroy_ops(ops);
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return ret;
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}
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/*
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* Request sync osd rollback
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*/
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static int rbd_req_sync_rollback_obj(struct rbd_device *dev,
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u64 snapid,
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@ -969,13 +1227,10 @@ static int rbd_req_sync_rollback_obj(struct rbd_device *dev,
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0,
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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ops,
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1, obj, 0, 0, NULL);
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1, obj, 0, 0, NULL, NULL, NULL);
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|
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rbd_destroy_ops(ops);
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|
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if (ret < 0)
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return ret;
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return ret;
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}
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@ -987,7 +1242,8 @@ static int rbd_req_sync_exec(struct rbd_device *dev,
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const char *cls,
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const char *method,
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const char *data,
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int len)
|
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int len,
|
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u64 *ver)
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{
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struct ceph_osd_req_op *ops;
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int cls_len = strlen(cls);
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@ -1010,7 +1266,7 @@ static int rbd_req_sync_exec(struct rbd_device *dev,
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0,
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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ops,
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1, obj, 0, 0, NULL);
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1, obj, 0, 0, NULL, NULL, ver);
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rbd_destroy_ops(ops);
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@ -1156,6 +1412,7 @@ static int rbd_read_header(struct rbd_device *rbd_dev,
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struct rbd_image_header_ondisk *dh;
|
||||
int snap_count = 0;
|
||||
u64 snap_names_len = 0;
|
||||
u64 ver;
|
||||
|
||||
while (1) {
|
||||
int len = sizeof(*dh) +
|
||||
@ -1171,7 +1428,7 @@ static int rbd_read_header(struct rbd_device *rbd_dev,
|
||||
NULL, CEPH_NOSNAP,
|
||||
rbd_dev->obj_md_name,
|
||||
0, len,
|
||||
(char *)dh);
|
||||
(char *)dh, &ver);
|
||||
if (rc < 0)
|
||||
goto out_dh;
|
||||
|
||||
@ -1188,6 +1445,7 @@ static int rbd_read_header(struct rbd_device *rbd_dev,
|
||||
}
|
||||
break;
|
||||
}
|
||||
header->obj_version = ver;
|
||||
|
||||
out_dh:
|
||||
kfree(dh);
|
||||
@ -1205,6 +1463,7 @@ static int rbd_header_add_snap(struct rbd_device *dev,
|
||||
u64 new_snapid;
|
||||
int ret;
|
||||
void *data, *data_start, *data_end;
|
||||
u64 ver;
|
||||
|
||||
/* we should create a snapshot only if we're pointing at the head */
|
||||
if (dev->cur_snap)
|
||||
@ -1227,7 +1486,7 @@ static int rbd_header_add_snap(struct rbd_device *dev,
|
||||
ceph_encode_64_safe(&data, data_end, new_snapid, bad);
|
||||
|
||||
ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add",
|
||||
data_start, data - data_start);
|
||||
data_start, data - data_start, &ver);
|
||||
|
||||
kfree(data_start);
|
||||
|
||||
@ -1259,6 +1518,7 @@ static int __rbd_update_snaps(struct rbd_device *rbd_dev)
|
||||
int ret;
|
||||
struct rbd_image_header h;
|
||||
u64 snap_seq;
|
||||
int follow_seq = 0;
|
||||
|
||||
ret = rbd_read_header(rbd_dev, &h);
|
||||
if (ret < 0)
|
||||
@ -1267,6 +1527,11 @@ static int __rbd_update_snaps(struct rbd_device *rbd_dev)
|
||||
down_write(&rbd_dev->header.snap_rwsem);
|
||||
|
||||
snap_seq = rbd_dev->header.snapc->seq;
|
||||
if (rbd_dev->header.total_snaps &&
|
||||
rbd_dev->header.snapc->snaps[0] == snap_seq)
|
||||
/* pointing at the head, will need to follow that
|
||||
if head moves */
|
||||
follow_seq = 1;
|
||||
|
||||
kfree(rbd_dev->header.snapc);
|
||||
kfree(rbd_dev->header.snap_names);
|
||||
@ -1277,7 +1542,10 @@ static int __rbd_update_snaps(struct rbd_device *rbd_dev)
|
||||
rbd_dev->header.snap_names = h.snap_names;
|
||||
rbd_dev->header.snap_names_len = h.snap_names_len;
|
||||
rbd_dev->header.snap_sizes = h.snap_sizes;
|
||||
rbd_dev->header.snapc->seq = snap_seq;
|
||||
if (follow_seq)
|
||||
rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0];
|
||||
else
|
||||
rbd_dev->header.snapc->seq = snap_seq;
|
||||
|
||||
ret = __rbd_init_snaps_header(rbd_dev);
|
||||
|
||||
@ -1699,7 +1967,28 @@ static void rbd_bus_del_dev(struct rbd_device *rbd_dev)
|
||||
device_unregister(&rbd_dev->dev);
|
||||
}
|
||||
|
||||
static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count)
|
||||
static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
|
||||
{
|
||||
int ret, rc;
|
||||
|
||||
do {
|
||||
ret = rbd_req_sync_watch(rbd_dev, rbd_dev->obj_md_name,
|
||||
rbd_dev->header.obj_version);
|
||||
if (ret == -ERANGE) {
|
||||
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
|
||||
rc = __rbd_update_snaps(rbd_dev);
|
||||
mutex_unlock(&ctl_mutex);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
}
|
||||
} while (ret == -ERANGE);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t rbd_add(struct bus_type *bus,
|
||||
const char *buf,
|
||||
size_t count)
|
||||
{
|
||||
struct ceph_osd_client *osdc;
|
||||
struct rbd_device *rbd_dev;
|
||||
@ -1797,6 +2086,10 @@ static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count)
|
||||
if (rc)
|
||||
goto err_out_bus;
|
||||
|
||||
rc = rbd_init_watch_dev(rbd_dev);
|
||||
if (rc)
|
||||
goto err_out_bus;
|
||||
|
||||
return count;
|
||||
|
||||
err_out_bus:
|
||||
@ -1849,6 +2142,12 @@ static void rbd_dev_release(struct device *dev)
|
||||
struct rbd_device *rbd_dev =
|
||||
container_of(dev, struct rbd_device, dev);
|
||||
|
||||
if (rbd_dev->watch_request)
|
||||
ceph_osdc_unregister_linger_request(&rbd_dev->client->osdc,
|
||||
rbd_dev->watch_request);
|
||||
if (rbd_dev->watch_event)
|
||||
ceph_osdc_cancel_event(rbd_dev->watch_event);
|
||||
|
||||
rbd_put_client(rbd_dev);
|
||||
|
||||
/* clean up and free blkdev */
|
||||
@ -1914,14 +2213,24 @@ static ssize_t rbd_snap_add(struct device *dev,
|
||||
ret = rbd_header_add_snap(rbd_dev,
|
||||
name, GFP_KERNEL);
|
||||
if (ret < 0)
|
||||
goto done_unlock;
|
||||
goto err_unlock;
|
||||
|
||||
ret = __rbd_update_snaps(rbd_dev);
|
||||
if (ret < 0)
|
||||
goto done_unlock;
|
||||
goto err_unlock;
|
||||
|
||||
/* shouldn't hold ctl_mutex when notifying.. notify might
|
||||
trigger a watch callback that would need to get that mutex */
|
||||
mutex_unlock(&ctl_mutex);
|
||||
|
||||
/* make a best effort, don't error if failed */
|
||||
rbd_req_sync_notify(rbd_dev, rbd_dev->obj_md_name);
|
||||
|
||||
ret = count;
|
||||
done_unlock:
|
||||
kfree(name);
|
||||
return ret;
|
||||
|
||||
err_unlock:
|
||||
mutex_unlock(&ctl_mutex);
|
||||
kfree(name);
|
||||
return ret;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user