diff options
Diffstat (limited to 'kernel/net/ceph/ceph_common.c')
| -rw-r--r-- | kernel/net/ceph/ceph_common.c | 725 |
1 files changed, 725 insertions, 0 deletions
diff --git a/kernel/net/ceph/ceph_common.c b/kernel/net/ceph/ceph_common.c new file mode 100644 index 000000000..79e8f71ae --- /dev/null +++ b/kernel/net/ceph/ceph_common.c @@ -0,0 +1,725 @@ + +#include <linux/ceph/ceph_debug.h> +#include <linux/backing-dev.h> +#include <linux/ctype.h> +#include <linux/fs.h> +#include <linux/inet.h> +#include <linux/in6.h> +#include <linux/key.h> +#include <keys/ceph-type.h> +#include <linux/module.h> +#include <linux/mount.h> +#include <linux/parser.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/statfs.h> +#include <linux/string.h> +#include <linux/vmalloc.h> +#include <linux/nsproxy.h> +#include <net/net_namespace.h> + + +#include <linux/ceph/ceph_features.h> +#include <linux/ceph/libceph.h> +#include <linux/ceph/debugfs.h> +#include <linux/ceph/decode.h> +#include <linux/ceph/mon_client.h> +#include <linux/ceph/auth.h> +#include "crypto.h" + + +/* + * Module compatibility interface. For now it doesn't do anything, + * but its existence signals a certain level of functionality. + * + * The data buffer is used to pass information both to and from + * libceph. The return value indicates whether libceph determines + * it is compatible with the caller (from another kernel module), + * given the provided data. + * + * The data pointer can be null. + */ +bool libceph_compatible(void *data) +{ + return true; +} +EXPORT_SYMBOL(libceph_compatible); + +/* + * find filename portion of a path (/foo/bar/baz -> baz) + */ +const char *ceph_file_part(const char *s, int len) +{ + const char *e = s + len; + + while (e != s && *(e-1) != '/') + e--; + return e; +} +EXPORT_SYMBOL(ceph_file_part); + +const char *ceph_msg_type_name(int type) +{ + switch (type) { + case CEPH_MSG_SHUTDOWN: return "shutdown"; + case CEPH_MSG_PING: return "ping"; + case CEPH_MSG_AUTH: return "auth"; + case CEPH_MSG_AUTH_REPLY: return "auth_reply"; + case CEPH_MSG_MON_MAP: return "mon_map"; + case CEPH_MSG_MON_GET_MAP: return "mon_get_map"; + case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe"; + case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack"; + case CEPH_MSG_STATFS: return "statfs"; + case CEPH_MSG_STATFS_REPLY: return "statfs_reply"; + case CEPH_MSG_MON_GET_VERSION: return "mon_get_version"; + case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply"; + case CEPH_MSG_MDS_MAP: return "mds_map"; + case CEPH_MSG_CLIENT_SESSION: return "client_session"; + case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect"; + case CEPH_MSG_CLIENT_REQUEST: return "client_request"; + case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward"; + case CEPH_MSG_CLIENT_REPLY: return "client_reply"; + case CEPH_MSG_CLIENT_CAPS: return "client_caps"; + case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release"; + case CEPH_MSG_CLIENT_SNAP: return "client_snap"; + case CEPH_MSG_CLIENT_LEASE: return "client_lease"; + case CEPH_MSG_OSD_MAP: return "osd_map"; + case CEPH_MSG_OSD_OP: return "osd_op"; + case CEPH_MSG_OSD_OPREPLY: return "osd_opreply"; + case CEPH_MSG_WATCH_NOTIFY: return "watch_notify"; + default: return "unknown"; + } +} +EXPORT_SYMBOL(ceph_msg_type_name); + +/* + * Initially learn our fsid, or verify an fsid matches. + */ +int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid) +{ + if (client->have_fsid) { + if (ceph_fsid_compare(&client->fsid, fsid)) { + pr_err("bad fsid, had %pU got %pU", + &client->fsid, fsid); + return -1; + } + } else { + memcpy(&client->fsid, fsid, sizeof(*fsid)); + } + return 0; +} +EXPORT_SYMBOL(ceph_check_fsid); + +static int strcmp_null(const char *s1, const char *s2) +{ + if (!s1 && !s2) + return 0; + if (s1 && !s2) + return -1; + if (!s1 && s2) + return 1; + return strcmp(s1, s2); +} + +int ceph_compare_options(struct ceph_options *new_opt, + struct ceph_client *client) +{ + struct ceph_options *opt1 = new_opt; + struct ceph_options *opt2 = client->options; + int ofs = offsetof(struct ceph_options, mon_addr); + int i; + int ret; + + ret = memcmp(opt1, opt2, ofs); + if (ret) + return ret; + + ret = strcmp_null(opt1->name, opt2->name); + if (ret) + return ret; + + if (opt1->key && !opt2->key) + return -1; + if (!opt1->key && opt2->key) + return 1; + if (opt1->key && opt2->key) { + if (opt1->key->type != opt2->key->type) + return -1; + if (opt1->key->created.tv_sec != opt2->key->created.tv_sec) + return -1; + if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec) + return -1; + if (opt1->key->len != opt2->key->len) + return -1; + if (opt1->key->key && !opt2->key->key) + return -1; + if (!opt1->key->key && opt2->key->key) + return 1; + if (opt1->key->key && opt2->key->key) { + ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len); + if (ret) + return ret; + } + } + + /* any matching mon ip implies a match */ + for (i = 0; i < opt1->num_mon; i++) { + if (ceph_monmap_contains(client->monc.monmap, + &opt1->mon_addr[i])) + return 0; + } + return -1; +} +EXPORT_SYMBOL(ceph_compare_options); + +void *ceph_kvmalloc(size_t size, gfp_t flags) +{ + if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { + void *ptr = kmalloc(size, flags | __GFP_NOWARN); + if (ptr) + return ptr; + } + + return __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL); +} + + +static int parse_fsid(const char *str, struct ceph_fsid *fsid) +{ + int i = 0; + char tmp[3]; + int err = -EINVAL; + int d; + + dout("parse_fsid '%s'\n", str); + tmp[2] = 0; + while (*str && i < 16) { + if (ispunct(*str)) { + str++; + continue; + } + if (!isxdigit(str[0]) || !isxdigit(str[1])) + break; + tmp[0] = str[0]; + tmp[1] = str[1]; + if (sscanf(tmp, "%x", &d) < 1) + break; + fsid->fsid[i] = d & 0xff; + i++; + str += 2; + } + + if (i == 16) + err = 0; + dout("parse_fsid ret %d got fsid %pU", err, fsid); + return err; +} + +/* + * ceph options + */ +enum { + Opt_osdtimeout, + Opt_osdkeepalivetimeout, + Opt_mount_timeout, + Opt_osd_idle_ttl, + Opt_last_int, + /* int args above */ + Opt_fsid, + Opt_name, + Opt_secret, + Opt_key, + Opt_ip, + Opt_last_string, + /* string args above */ + Opt_share, + Opt_noshare, + Opt_crc, + Opt_nocrc, + Opt_cephx_require_signatures, + Opt_nocephx_require_signatures, + Opt_tcp_nodelay, + Opt_notcp_nodelay, +}; + +static match_table_t opt_tokens = { + {Opt_osdtimeout, "osdtimeout=%d"}, + {Opt_osdkeepalivetimeout, "osdkeepalive=%d"}, + {Opt_mount_timeout, "mount_timeout=%d"}, + {Opt_osd_idle_ttl, "osd_idle_ttl=%d"}, + /* int args above */ + {Opt_fsid, "fsid=%s"}, + {Opt_name, "name=%s"}, + {Opt_secret, "secret=%s"}, + {Opt_key, "key=%s"}, + {Opt_ip, "ip=%s"}, + /* string args above */ + {Opt_share, "share"}, + {Opt_noshare, "noshare"}, + {Opt_crc, "crc"}, + {Opt_nocrc, "nocrc"}, + {Opt_cephx_require_signatures, "cephx_require_signatures"}, + {Opt_nocephx_require_signatures, "nocephx_require_signatures"}, + {Opt_tcp_nodelay, "tcp_nodelay"}, + {Opt_notcp_nodelay, "notcp_nodelay"}, + {-1, NULL} +}; + +void ceph_destroy_options(struct ceph_options *opt) +{ + dout("destroy_options %p\n", opt); + kfree(opt->name); + if (opt->key) { + ceph_crypto_key_destroy(opt->key); + kfree(opt->key); + } + kfree(opt->mon_addr); + kfree(opt); +} +EXPORT_SYMBOL(ceph_destroy_options); + +/* get secret from key store */ +static int get_secret(struct ceph_crypto_key *dst, const char *name) { + struct key *ukey; + int key_err; + int err = 0; + struct ceph_crypto_key *ckey; + + ukey = request_key(&key_type_ceph, name, NULL); + if (!ukey || IS_ERR(ukey)) { + /* request_key errors don't map nicely to mount(2) + errors; don't even try, but still printk */ + key_err = PTR_ERR(ukey); + switch (key_err) { + case -ENOKEY: + pr_warn("ceph: Mount failed due to key not found: %s\n", + name); + break; + case -EKEYEXPIRED: + pr_warn("ceph: Mount failed due to expired key: %s\n", + name); + break; + case -EKEYREVOKED: + pr_warn("ceph: Mount failed due to revoked key: %s\n", + name); + break; + default: + pr_warn("ceph: Mount failed due to unknown key error %d: %s\n", + key_err, name); + } + err = -EPERM; + goto out; + } + + ckey = ukey->payload.data; + err = ceph_crypto_key_clone(dst, ckey); + if (err) + goto out_key; + /* pass through, err is 0 */ + +out_key: + key_put(ukey); +out: + return err; +} + +struct ceph_options * +ceph_parse_options(char *options, const char *dev_name, + const char *dev_name_end, + int (*parse_extra_token)(char *c, void *private), + void *private) +{ + struct ceph_options *opt; + const char *c; + int err = -ENOMEM; + substring_t argstr[MAX_OPT_ARGS]; + + if (current->nsproxy->net_ns != &init_net) + return ERR_PTR(-EINVAL); + + opt = kzalloc(sizeof(*opt), GFP_KERNEL); + if (!opt) + return ERR_PTR(-ENOMEM); + opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr), + GFP_KERNEL); + if (!opt->mon_addr) + goto out; + + dout("parse_options %p options '%s' dev_name '%s'\n", opt, options, + dev_name); + + /* start with defaults */ + opt->flags = CEPH_OPT_DEFAULT; + opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT; + opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */ + opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */ + + /* get mon ip(s) */ + /* ip1[:port1][,ip2[:port2]...] */ + err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr, + CEPH_MAX_MON, &opt->num_mon); + if (err < 0) + goto out; + + /* parse mount options */ + while ((c = strsep(&options, ",")) != NULL) { + int token, intval, ret; + if (!*c) + continue; + err = -EINVAL; + token = match_token((char *)c, opt_tokens, argstr); + if (token < 0 && parse_extra_token) { + /* extra? */ + err = parse_extra_token((char *)c, private); + if (err < 0) { + pr_err("bad option at '%s'\n", c); + goto out; + } + continue; + } + if (token < Opt_last_int) { + ret = match_int(&argstr[0], &intval); + if (ret < 0) { + pr_err("bad mount option arg (not int) " + "at '%s'\n", c); + continue; + } + dout("got int token %d val %d\n", token, intval); + } else if (token > Opt_last_int && token < Opt_last_string) { + dout("got string token %d val %s\n", token, + argstr[0].from); + } else { + dout("got token %d\n", token); + } + switch (token) { + case Opt_ip: + err = ceph_parse_ips(argstr[0].from, + argstr[0].to, + &opt->my_addr, + 1, NULL); + if (err < 0) + goto out; + opt->flags |= CEPH_OPT_MYIP; + break; + + case Opt_fsid: + err = parse_fsid(argstr[0].from, &opt->fsid); + if (err == 0) + opt->flags |= CEPH_OPT_FSID; + break; + case Opt_name: + opt->name = kstrndup(argstr[0].from, + argstr[0].to-argstr[0].from, + GFP_KERNEL); + break; + case Opt_secret: + opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL); + if (!opt->key) { + err = -ENOMEM; + goto out; + } + err = ceph_crypto_key_unarmor(opt->key, argstr[0].from); + if (err < 0) + goto out; + break; + case Opt_key: + opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL); + if (!opt->key) { + err = -ENOMEM; + goto out; + } + err = get_secret(opt->key, argstr[0].from); + if (err < 0) + goto out; + break; + + /* misc */ + case Opt_osdtimeout: + pr_warn("ignoring deprecated osdtimeout option\n"); + break; + case Opt_osdkeepalivetimeout: + opt->osd_keepalive_timeout = intval; + break; + case Opt_osd_idle_ttl: + opt->osd_idle_ttl = intval; + break; + case Opt_mount_timeout: + opt->mount_timeout = intval; + break; + + case Opt_share: + opt->flags &= ~CEPH_OPT_NOSHARE; + break; + case Opt_noshare: + opt->flags |= CEPH_OPT_NOSHARE; + break; + + case Opt_crc: + opt->flags &= ~CEPH_OPT_NOCRC; + break; + case Opt_nocrc: + opt->flags |= CEPH_OPT_NOCRC; + break; + + case Opt_cephx_require_signatures: + opt->flags &= ~CEPH_OPT_NOMSGAUTH; + break; + case Opt_nocephx_require_signatures: + opt->flags |= CEPH_OPT_NOMSGAUTH; + break; + + case Opt_tcp_nodelay: + opt->flags |= CEPH_OPT_TCP_NODELAY; + break; + case Opt_notcp_nodelay: + opt->flags &= ~CEPH_OPT_TCP_NODELAY; + break; + + default: + BUG_ON(token); + } + } + + /* success */ + return opt; + +out: + ceph_destroy_options(opt); + return ERR_PTR(err); +} +EXPORT_SYMBOL(ceph_parse_options); + +int ceph_print_client_options(struct seq_file *m, struct ceph_client *client) +{ + struct ceph_options *opt = client->options; + size_t pos = m->count; + + if (opt->name) + seq_printf(m, "name=%s,", opt->name); + if (opt->key) + seq_puts(m, "secret=<hidden>,"); + + if (opt->flags & CEPH_OPT_FSID) + seq_printf(m, "fsid=%pU,", &opt->fsid); + if (opt->flags & CEPH_OPT_NOSHARE) + seq_puts(m, "noshare,"); + if (opt->flags & CEPH_OPT_NOCRC) + seq_puts(m, "nocrc,"); + if (opt->flags & CEPH_OPT_NOMSGAUTH) + seq_puts(m, "nocephx_require_signatures,"); + if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0) + seq_puts(m, "notcp_nodelay,"); + + if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) + seq_printf(m, "mount_timeout=%d,", opt->mount_timeout); + if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) + seq_printf(m, "osd_idle_ttl=%d,", opt->osd_idle_ttl); + if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) + seq_printf(m, "osdkeepalivetimeout=%d,", + opt->osd_keepalive_timeout); + + /* drop redundant comma */ + if (m->count != pos) + m->count--; + + return 0; +} +EXPORT_SYMBOL(ceph_print_client_options); + +u64 ceph_client_id(struct ceph_client *client) +{ + return client->monc.auth->global_id; +} +EXPORT_SYMBOL(ceph_client_id); + +/* + * create a fresh client instance + */ +struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private, + u64 supported_features, + u64 required_features) +{ + struct ceph_client *client; + struct ceph_entity_addr *myaddr = NULL; + int err = -ENOMEM; + + client = kzalloc(sizeof(*client), GFP_KERNEL); + if (client == NULL) + return ERR_PTR(-ENOMEM); + + client->private = private; + client->options = opt; + + mutex_init(&client->mount_mutex); + init_waitqueue_head(&client->auth_wq); + client->auth_err = 0; + + if (!ceph_test_opt(client, NOMSGAUTH)) + required_features |= CEPH_FEATURE_MSG_AUTH; + + client->extra_mon_dispatch = NULL; + client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT | + supported_features; + client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT | + required_features; + + /* msgr */ + if (ceph_test_opt(client, MYIP)) + myaddr = &client->options->my_addr; + + ceph_messenger_init(&client->msgr, myaddr, + client->supported_features, + client->required_features, + ceph_test_opt(client, NOCRC), + ceph_test_opt(client, TCP_NODELAY)); + + /* subsystems */ + err = ceph_monc_init(&client->monc, client); + if (err < 0) + goto fail; + err = ceph_osdc_init(&client->osdc, client); + if (err < 0) + goto fail_monc; + + return client; + +fail_monc: + ceph_monc_stop(&client->monc); +fail: + kfree(client); + return ERR_PTR(err); +} +EXPORT_SYMBOL(ceph_create_client); + +void ceph_destroy_client(struct ceph_client *client) +{ + dout("destroy_client %p\n", client); + + atomic_set(&client->msgr.stopping, 1); + + /* unmount */ + ceph_osdc_stop(&client->osdc); + + ceph_monc_stop(&client->monc); + + ceph_debugfs_client_cleanup(client); + + ceph_destroy_options(client->options); + + kfree(client); + dout("destroy_client %p done\n", client); +} +EXPORT_SYMBOL(ceph_destroy_client); + +/* + * true if we have the mon map (and have thus joined the cluster) + */ +static int have_mon_and_osd_map(struct ceph_client *client) +{ + return client->monc.monmap && client->monc.monmap->epoch && + client->osdc.osdmap && client->osdc.osdmap->epoch; +} + +/* + * mount: join the ceph cluster, and open root directory. + */ +int __ceph_open_session(struct ceph_client *client, unsigned long started) +{ + int err; + unsigned long timeout = client->options->mount_timeout * HZ; + + /* open session, and wait for mon and osd maps */ + err = ceph_monc_open_session(&client->monc); + if (err < 0) + return err; + + while (!have_mon_and_osd_map(client)) { + err = -EIO; + if (timeout && time_after_eq(jiffies, started + timeout)) + return err; + + /* wait */ + dout("mount waiting for mon_map\n"); + err = wait_event_interruptible_timeout(client->auth_wq, + have_mon_and_osd_map(client) || (client->auth_err < 0), + timeout); + if (err == -EINTR || err == -ERESTARTSYS) + return err; + if (client->auth_err < 0) + return client->auth_err; + } + + return 0; +} +EXPORT_SYMBOL(__ceph_open_session); + + +int ceph_open_session(struct ceph_client *client) +{ + int ret; + unsigned long started = jiffies; /* note the start time */ + + dout("open_session start\n"); + mutex_lock(&client->mount_mutex); + + ret = __ceph_open_session(client, started); + + mutex_unlock(&client->mount_mutex); + return ret; +} +EXPORT_SYMBOL(ceph_open_session); + + +static int __init init_ceph_lib(void) +{ + int ret = 0; + + ret = ceph_debugfs_init(); + if (ret < 0) + goto out; + + ret = ceph_crypto_init(); + if (ret < 0) + goto out_debugfs; + + ret = ceph_msgr_init(); + if (ret < 0) + goto out_crypto; + + ret = ceph_osdc_setup(); + if (ret < 0) + goto out_msgr; + + pr_info("loaded (mon/osd proto %d/%d)\n", + CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL); + + return 0; + +out_msgr: + ceph_msgr_exit(); +out_crypto: + ceph_crypto_shutdown(); +out_debugfs: + ceph_debugfs_cleanup(); +out: + return ret; +} + +static void __exit exit_ceph_lib(void) +{ + dout("exit_ceph_lib\n"); + ceph_osdc_cleanup(); + ceph_msgr_exit(); + ceph_crypto_shutdown(); + ceph_debugfs_cleanup(); +} + +module_init(init_ceph_lib); +module_exit(exit_ceph_lib); + +MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); +MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); +MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); +MODULE_DESCRIPTION("Ceph filesystem for Linux"); +MODULE_LICENSE("GPL"); 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