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https://github.com/edk2-porting/linux-next.git
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ceph: mount non-default filesystem by name
To mount non-default filesytem, user currently needs to provide mds namespace ID. This is inconvenience. This patch makes user be able to mount filesystem by name. If user wants to mount non-default filesystem. Client first subscribes to fsmap.user. Subscribe to mdsmap.<ID> after getting ID of filesystem. Signed-off-by: Yan, Zheng <zyan@redhat.com>
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0cabbd94ff
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430afbadd6
@ -2166,6 +2166,11 @@ static int __do_request(struct ceph_mds_client *mdsc,
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mds = __choose_mds(mdsc, req);
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if (mds < 0 ||
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ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
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if (mdsc->mdsmap_err) {
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err = mdsc->mdsmap_err;
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dout("do_request mdsmap err %d\n", err);
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goto finish;
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}
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dout("do_request no mds or not active, waiting for map\n");
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list_add(&req->r_wait, &mdsc->waiting_for_map);
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goto out;
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@ -3683,11 +3688,86 @@ void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
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dout("mdsc_destroy %p done\n", mdsc);
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}
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void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
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{
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struct ceph_fs_client *fsc = mdsc->fsc;
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const char *mds_namespace = fsc->mount_options->mds_namespace;
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void *p = msg->front.iov_base;
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void *end = p + msg->front.iov_len;
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u32 epoch;
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u32 map_len;
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u32 num_fs;
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u32 mount_fscid = (u32)-1;
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u8 struct_v, struct_cv;
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int err = -EINVAL;
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ceph_decode_need(&p, end, sizeof(u32), bad);
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epoch = ceph_decode_32(&p);
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dout("handle_fsmap epoch %u\n", epoch);
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ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
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struct_v = ceph_decode_8(&p);
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struct_cv = ceph_decode_8(&p);
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map_len = ceph_decode_32(&p);
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ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
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p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
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num_fs = ceph_decode_32(&p);
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while (num_fs-- > 0) {
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void *info_p, *info_end;
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u32 info_len;
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u8 info_v, info_cv;
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u32 fscid, namelen;
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ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
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info_v = ceph_decode_8(&p);
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info_cv = ceph_decode_8(&p);
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info_len = ceph_decode_32(&p);
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ceph_decode_need(&p, end, info_len, bad);
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info_p = p;
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info_end = p + info_len;
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p = info_end;
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ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
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fscid = ceph_decode_32(&info_p);
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namelen = ceph_decode_32(&info_p);
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ceph_decode_need(&info_p, info_end, namelen, bad);
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if (mds_namespace &&
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strlen(mds_namespace) == namelen &&
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!strncmp(mds_namespace, (char *)info_p, namelen)) {
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mount_fscid = fscid;
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break;
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}
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}
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ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
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if (mount_fscid != (u32)-1) {
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fsc->client->monc.fs_cluster_id = mount_fscid;
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ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
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0, true);
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ceph_monc_renew_subs(&fsc->client->monc);
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} else {
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err = -ENOENT;
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goto err_out;
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}
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return;
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bad:
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pr_err("error decoding fsmap\n");
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err_out:
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mutex_lock(&mdsc->mutex);
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mdsc->mdsmap_err = -ENOENT;
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__wake_requests(mdsc, &mdsc->waiting_for_map);
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mutex_unlock(&mdsc->mutex);
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return;
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}
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/*
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* handle mds map update.
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*/
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void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
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void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
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{
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u32 epoch;
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u32 maplen;
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@ -3794,7 +3874,10 @@ static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
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switch (type) {
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case CEPH_MSG_MDS_MAP:
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ceph_mdsc_handle_map(mdsc, msg);
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ceph_mdsc_handle_mdsmap(mdsc, msg);
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break;
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case CEPH_MSG_FS_MAP_USER:
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ceph_mdsc_handle_fsmap(mdsc, msg);
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break;
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case CEPH_MSG_CLIENT_SESSION:
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handle_session(s, msg);
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@ -293,6 +293,7 @@ struct ceph_mds_client {
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struct completion safe_umount_waiters;
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wait_queue_head_t session_close_wq;
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struct list_head waiting_for_map;
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int mdsmap_err;
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struct ceph_mds_session **sessions; /* NULL for mds if no session */
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atomic_t num_sessions;
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@ -419,8 +420,10 @@ extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
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struct dentry *dentry, char action,
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u32 seq);
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extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
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struct ceph_msg *msg);
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extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
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struct ceph_msg *msg);
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extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
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struct ceph_msg *msg);
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extern struct ceph_mds_session *
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ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
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@ -108,7 +108,6 @@ static int ceph_sync_fs(struct super_block *sb, int wait)
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* mount options
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*/
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enum {
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Opt_mds_namespace,
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Opt_wsize,
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Opt_rsize,
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Opt_rasize,
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@ -121,6 +120,7 @@ enum {
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Opt_last_int,
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/* int args above */
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Opt_snapdirname,
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Opt_mds_namespace,
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Opt_last_string,
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/* string args above */
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Opt_dirstat,
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@ -144,7 +144,6 @@ enum {
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};
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static match_table_t fsopt_tokens = {
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{Opt_mds_namespace, "mds_namespace=%d"},
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{Opt_wsize, "wsize=%d"},
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{Opt_rsize, "rsize=%d"},
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{Opt_rasize, "rasize=%d"},
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@ -156,6 +155,7 @@ static match_table_t fsopt_tokens = {
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{Opt_congestion_kb, "write_congestion_kb=%d"},
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/* int args above */
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{Opt_snapdirname, "snapdirname=%s"},
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{Opt_mds_namespace, "mds_namespace=%s"},
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/* string args above */
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{Opt_dirstat, "dirstat"},
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{Opt_nodirstat, "nodirstat"},
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@ -212,11 +212,14 @@ static int parse_fsopt_token(char *c, void *private)
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if (!fsopt->snapdir_name)
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return -ENOMEM;
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break;
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/* misc */
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case Opt_mds_namespace:
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fsopt->mds_namespace = intval;
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fsopt->mds_namespace = kstrndup(argstr[0].from,
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argstr[0].to-argstr[0].from,
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GFP_KERNEL);
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if (!fsopt->mds_namespace)
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return -ENOMEM;
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break;
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/* misc */
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case Opt_wsize:
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fsopt->wsize = intval;
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break;
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@ -302,6 +305,7 @@ static void destroy_mount_options(struct ceph_mount_options *args)
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{
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dout("destroy_mount_options %p\n", args);
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kfree(args->snapdir_name);
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kfree(args->mds_namespace);
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kfree(args->server_path);
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kfree(args);
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}
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@ -331,6 +335,9 @@ static int compare_mount_options(struct ceph_mount_options *new_fsopt,
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return ret;
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ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
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if (ret)
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return ret;
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ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
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if (ret)
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return ret;
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@ -376,7 +383,6 @@ static int parse_mount_options(struct ceph_mount_options **pfsopt,
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fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
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fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
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fsopt->congestion_kb = default_congestion_kb();
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fsopt->mds_namespace = CEPH_FS_CLUSTER_ID_NONE;
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/*
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* Distinguish the server list from the path in "dev_name".
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@ -469,8 +475,8 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
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seq_puts(m, ",noacl");
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#endif
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if (fsopt->mds_namespace != CEPH_FS_CLUSTER_ID_NONE)
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seq_printf(m, ",mds_namespace=%d", fsopt->mds_namespace);
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if (fsopt->mds_namespace)
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seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
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if (fsopt->wsize)
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seq_printf(m, ",wsize=%d", fsopt->wsize);
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if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
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@ -509,9 +515,11 @@ static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
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switch (type) {
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case CEPH_MSG_MDS_MAP:
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ceph_mdsc_handle_map(fsc->mdsc, msg);
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ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
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return 0;
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case CEPH_MSG_FS_MAP_USER:
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ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
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return 0;
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default:
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return -1;
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}
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@ -543,8 +551,14 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
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goto fail;
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}
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fsc->client->extra_mon_dispatch = extra_mon_dispatch;
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fsc->client->monc.fs_cluster_id = fsopt->mds_namespace;
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ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 0, true);
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if (fsopt->mds_namespace == NULL) {
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ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
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0, true);
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} else {
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ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
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0, false);
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}
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fsc->mount_options = fsopt;
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@ -62,7 +62,6 @@ struct ceph_mount_options {
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int cap_release_safety;
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int max_readdir; /* max readdir result (entires) */
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int max_readdir_bytes; /* max readdir result (bytes) */
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int mds_namespace;
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/*
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* everything above this point can be memcmp'd; everything below
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@ -70,6 +69,7 @@ struct ceph_mount_options {
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*/
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char *snapdir_name; /* default ".snap" */
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char *mds_namespace; /* default NULL */
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char *server_path; /* default "/" */
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};
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