fs/ceph/super.c

   1
   2 #include "ceph_debug.h"
   3
   4 #include <linux/backing-dev.h>
   5 #include <linux/fs.h>
   6 #include <linux/inet.h>
   7 #include <linux/in6.h>
   8 #include <linux/module.h>
   9 #include <linux/mount.h>
  10 #include <linux/parser.h>
  11 #include <linux/rwsem.h>
  12 #include <linux/sched.h>
  13 #include <linux/seq_file.h>
  14 #include <linux/slab.h>
  15 #include <linux/statfs.h>
  16 #include <linux/string.h>
  17 #include <linux/version.h>
  18 #include <linux/vmalloc.h>
  19
  20 #include "decode.h"
  21 #include "super.h"
  22 #include "mon_client.h"
  23 #include "auth.h"
  24
  25 /*
  26  * Ceph superblock operations
  27  *
  28  * Handle the basics of mounting, unmounting.
  29  */
  30
  31
  32 /*
  33  * find filename portion of a path (/foo/bar/baz -> baz)
  34  */
  35 const char *ceph_file_part(const char *s, int len)
  36 {
  37         const char *e = s + len;
  38
  39         while (e != s && *(e-1) != '/')
  40                 e--;
  41         return e;
  42 }
  43
  44
  45 /*
  46  * super ops
  47  */
  48 static void ceph_put_super(struct super_block *s)
  49 {
  50         struct ceph_client *cl = ceph_client(s);
  51
  52         dout("put_super\n");
  53         ceph_mdsc_close_sessions(&cl->mdsc);
  54         return;
  55 }
  56
  57 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  58 {
  59         struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
  60         struct ceph_monmap *monmap = client->monc.monmap;
  61         struct ceph_statfs st;
  62         u64 fsid;
  63         int err;
  64
  65         dout("statfs\n");
  66         err = ceph_monc_do_statfs(&client->monc, &st);
  67         if (err < 0)
  68                 return err;
  69
  70         /* fill in kstatfs */
  71         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  72
  73         /*
  74          * express utilization in terms of large blocks to avoid
  75          * overflow on 32-bit machines.
  76          */
  77         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  78         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  79         buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
  80                 (CEPH_BLOCK_SHIFT-10);
  81         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  82
  83         buf->f_files = le64_to_cpu(st.num_objects);
  84         buf->f_ffree = -1;
  85         buf->f_namelen = PATH_MAX;
  86         buf->f_frsize = PAGE_CACHE_SIZE;
  87
  88         /* leave fsid little-endian, regardless of host endianness */
  89         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  90         buf->f_fsid.val[0] = fsid & 0xffffffff;
  91         buf->f_fsid.val[1] = fsid >> 32;
  92
  93         return 0;
  94 }
  95
  96
  97 static int ceph_syncfs(struct super_block *sb, int wait)
  98 {
  99         dout("sync_fs %d\n", wait);
 100         ceph_osdc_sync(&ceph_client(sb)->osdc);
 101         ceph_mdsc_sync(&ceph_client(sb)->mdsc);
 102         dout("sync_fs %d done\n", wait);
 103         return 0;
 104 }
 105
 106
 107 /**
 108  * ceph_show_options - Show mount options in /proc/mounts
 109  * @m: seq_file to write to
 110  * @mnt: mount descriptor
 111  */
 112 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
 113 {
 114         struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
 115         struct ceph_mount_args *args = client->mount_args;
 116
 117         if (args->flags & CEPH_OPT_FSID)
 118                 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
 119                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
 120                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
 121         if (args->flags & CEPH_OPT_NOSHARE)
 122                 seq_puts(m, ",noshare");
 123         if (args->flags & CEPH_OPT_DIRSTAT)
 124                 seq_puts(m, ",dirstat");
 125         if ((args->flags & CEPH_OPT_RBYTES) == 0)
 126                 seq_puts(m, ",norbytes");
 127         if (args->flags & CEPH_OPT_NOCRC)
 128                 seq_puts(m, ",nocrc");
 129         if (args->flags & CEPH_OPT_NOASYNCREADDIR)
 130                 seq_puts(m, ",noasyncreaddir");
 131         if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 132                 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
 133         if (args->name)
 134                 seq_printf(m, ",name=%s", args->name);
 135         if (args->secret)
 136                 seq_puts(m, ",secret=<hidden>");
 137         return 0;
 138 }
 139
 140 /*
 141  * caches
 142  */
 143 struct kmem_cache *ceph_inode_cachep;
 144 struct kmem_cache *ceph_cap_cachep;
 145 struct kmem_cache *ceph_dentry_cachep;
 146 struct kmem_cache *ceph_file_cachep;
 147
 148 static void ceph_inode_init_once(void *foo)
 149 {
 150         struct ceph_inode_info *ci = foo;
 151         inode_init_once(&ci->vfs_inode);
 152 }
 153
 154 static int default_congestion_kb(void)
 155 {
 156         int congestion_kb;
 157
 158         /*
 159          * Copied from NFS
 160          *
 161          * congestion size, scale with available memory.
 162          *
 163          *  64MB:    8192k
 164          * 128MB:   11585k
 165          * 256MB:   16384k
 166          * 512MB:   23170k
 167          *   1GB:   32768k
 168          *   2GB:   46340k
 169          *   4GB:   65536k
 170          *   8GB:   92681k
 171          *  16GB:  131072k
 172          *
 173          * This allows larger machines to have larger/more transfers.
 174          * Limit the default to 256M
 175          */
 176         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 177         if (congestion_kb > 256*1024)
 178                 congestion_kb = 256*1024;
 179
 180         return congestion_kb;
 181 }
 182
 183 static int __init init_caches(void)
 184 {
 185         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 186                                       sizeof(struct ceph_inode_info),
 187                                       __alignof__(struct ceph_inode_info),
 188                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 189                                       ceph_inode_init_once);
 190         if (ceph_inode_cachep == NULL)
 191                 return -ENOMEM;
 192
 193         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 194                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 195         if (ceph_cap_cachep == NULL)
 196                 goto bad_cap;
 197
 198         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 199                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 200         if (ceph_dentry_cachep == NULL)
 201                 goto bad_dentry;
 202
 203         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 204                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 205         if (ceph_file_cachep == NULL)
 206                 goto bad_file;
 207
 208         return 0;
 209
 210 bad_file:
 211         kmem_cache_destroy(ceph_dentry_cachep);
 212 bad_dentry:
 213         kmem_cache_destroy(ceph_cap_cachep);
 214 bad_cap:
 215         kmem_cache_destroy(ceph_inode_cachep);
 216         return -ENOMEM;
 217 }
 218
 219 static void destroy_caches(void)
 220 {
 221         kmem_cache_destroy(ceph_inode_cachep);
 222         kmem_cache_destroy(ceph_cap_cachep);
 223         kmem_cache_destroy(ceph_dentry_cachep);
 224         kmem_cache_destroy(ceph_file_cachep);
 225 }
 226
 227
 228 /*
 229  * ceph_umount_begin - initiate forced umount.  Tear down down the
 230  * mount, skipping steps that may hang while waiting for server(s).
 231  */
 232 static void ceph_umount_begin(struct super_block *sb)
 233 {
 234         struct ceph_client *client = ceph_sb_to_client(sb);
 235
 236         dout("ceph_umount_begin - starting forced umount\n");
 237         if (!client)
 238                 return;
 239         client->mount_state = CEPH_MOUNT_SHUTDOWN;
 240         return;
 241 }
 242
 243 static const struct super_operations ceph_super_ops = {
 244         .alloc_inode    = ceph_alloc_inode,
 245         .destroy_inode  = ceph_destroy_inode,
 246         .write_inode    = ceph_write_inode,
 247         .sync_fs        = ceph_syncfs,
 248         .put_super      = ceph_put_super,
 249         .show_options   = ceph_show_options,
 250         .statfs         = ceph_statfs,
 251         .umount_begin   = ceph_umount_begin,
 252 };
 253
 254
 255 const char *ceph_msg_type_name(int type)
 256 {
 257         switch (type) {
 258         case CEPH_MSG_SHUTDOWN: return "shutdown";
 259         case CEPH_MSG_PING: return "ping";
 260         case CEPH_MSG_AUTH: return "auth";
 261         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
 262         case CEPH_MSG_MON_MAP: return "mon_map";
 263         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
 264         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
 265         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
 266         case CEPH_MSG_STATFS: return "statfs";
 267         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
 268         case CEPH_MSG_MDS_MAP: return "mds_map";
 269         case CEPH_MSG_CLIENT_SESSION: return "client_session";
 270         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
 271         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
 272         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
 273         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
 274         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
 275         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
 276         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
 277         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
 278         case CEPH_MSG_OSD_MAP: return "osd_map";
 279         case CEPH_MSG_OSD_OP: return "osd_op";
 280         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
 281         default: return "unknown";
 282         }
 283 }
 284
 285
 286 /*
 287  * mount options
 288  */
 289 enum {
 290         Opt_fsidmajor,
 291         Opt_fsidminor,
 292         Opt_monport,
 293         Opt_wsize,
 294         Opt_rsize,
 295         Opt_osdtimeout,
 296         Opt_osdkeepalivetimeout,
 297         Opt_mount_timeout,
 298         Opt_osd_idle_ttl,
 299         Opt_caps_wanted_delay_min,
 300         Opt_caps_wanted_delay_max,
 301         Opt_readdir_max_entries,
 302         Opt_congestion_kb,
 303         Opt_last_int,
 304         /* int args above */
 305         Opt_snapdirname,
 306         Opt_name,
 307         Opt_secret,
 308         Opt_last_string,
 309         /* string args above */
 310         Opt_ip,
 311         Opt_noshare,
 312         Opt_dirstat,
 313         Opt_nodirstat,
 314         Opt_rbytes,
 315         Opt_norbytes,
 316         Opt_nocrc,
 317         Opt_noasyncreaddir,
 318 };
 319
 320 static match_table_t arg_tokens = {
 321         {Opt_fsidmajor, "fsidmajor=%ld"},
 322         {Opt_fsidminor, "fsidminor=%ld"},
 323         {Opt_monport, "monport=%d"},
 324         {Opt_wsize, "wsize=%d"},
 325         {Opt_rsize, "rsize=%d"},
 326         {Opt_osdtimeout, "osdtimeout=%d"},
 327         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
 328         {Opt_mount_timeout, "mount_timeout=%d"},
 329         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
 330         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 331         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 332         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 333         {Opt_congestion_kb, "write_congestion_kb=%d"},
 334         /* int args above */
 335         {Opt_snapdirname, "snapdirname=%s"},
 336         {Opt_name, "name=%s"},
 337         {Opt_secret, "secret=%s"},
 338         /* string args above */
 339         {Opt_ip, "ip=%s"},
 340         {Opt_noshare, "noshare"},
 341         {Opt_dirstat, "dirstat"},
 342         {Opt_nodirstat, "nodirstat"},
 343         {Opt_rbytes, "rbytes"},
 344         {Opt_norbytes, "norbytes"},
 345         {Opt_nocrc, "nocrc"},
 346         {Opt_noasyncreaddir, "noasyncreaddir"},
 347         {-1, NULL}
 348 };
 349
 350
 351 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
 352                                                 const char *dev_name,
 353                                                 const char **path)
 354 {
 355         struct ceph_mount_args *args;
 356         const char *c;
 357         int err = -ENOMEM;
 358         substring_t argstr[MAX_OPT_ARGS];
 359
 360         args = kzalloc(sizeof(*args), GFP_KERNEL);
 361         if (!args)
 362                 return ERR_PTR(-ENOMEM);
 363         args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
 364                                  GFP_KERNEL);
 365         if (!args->mon_addr)
 366                 goto out;
 367
 368         dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
 369
 370         /* start with defaults */
 371         args->sb_flags = flags;
 372         args->flags = CEPH_OPT_DEFAULT;
 373         args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
 374         args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
 375         args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
 376         args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */
 377         args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 378         args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 379         args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
 380         args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 381         args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
 382         args->max_readdir = 1024;
 383         args->congestion_kb = default_congestion_kb();
 384
 385         /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
 386         err = -EINVAL;
 387         if (!dev_name)
 388                 goto out;
 389         *path = strstr(dev_name, ":/");
 390         if (*path == NULL) {
 391                 pr_err("device name is missing path (no :/ in %s)\n",
 392                        dev_name);
 393                 goto out;
 394         }
 395
 396         /* get mon ip(s) */
 397         err = ceph_parse_ips(dev_name, *path, args->mon_addr,
 398                              CEPH_MAX_MON, &args->num_mon);
 399         if (err < 0)
 400                 goto out;
 401
 402         /* path on server */
 403         *path += 2;
 404         dout("server path '%s'\n", *path);
 405
 406         /* parse mount options */
 407         while ((c = strsep(&options, ",")) != NULL) {
 408                 int token, intval, ret;
 409                 if (!*c)
 410                         continue;
 411                 err = -EINVAL;
 412                 token = match_token((char *)c, arg_tokens, argstr);
 413                 if (token < 0) {
 414                         pr_err("bad mount option at '%s'\n", c);
 415                         goto out;
 416                 }
 417                 if (token < Opt_last_int) {
 418                         ret = match_int(&argstr[0], &intval);
 419                         if (ret < 0) {
 420                                 pr_err("bad mount option arg (not int) "
 421                                        "at '%s'\n", c);
 422                                 continue;
 423                         }
 424                         dout("got int token %d val %d\n", token, intval);
 425                 } else if (token > Opt_last_int && token < Opt_last_string) {
 426                         dout("got string token %d val %s\n", token,
 427                              argstr[0].from);
 428                 } else {
 429                         dout("got token %d\n", token);
 430                 }
 431                 switch (token) {
 432                 case Opt_fsidmajor:
 433                         *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
 434                         break;
 435                 case Opt_fsidminor:
 436                         *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
 437                         break;
 438                 case Opt_ip:
 439                         err = ceph_parse_ips(argstr[0].from,
 440                                              argstr[0].to,
 441                                              &args->my_addr,
 442                                              1, NULL);
 443                         if (err < 0)
 444                                 goto out;
 445                         args->flags |= CEPH_OPT_MYIP;
 446                         break;
 447
 448                 case Opt_snapdirname:
 449                         kfree(args->snapdir_name);
 450                         args->snapdir_name = kstrndup(argstr[0].from,
 451                                               argstr[0].to-argstr[0].from,
 452                                               GFP_KERNEL);
 453                         break;
 454                 case Opt_name:
 455                         args->name = kstrndup(argstr[0].from,
 456                                               argstr[0].to-argstr[0].from,
 457                                               GFP_KERNEL);
 458                         break;
 459                 case Opt_secret:
 460                         args->secret = kstrndup(argstr[0].from,
 461                                                 argstr[0].to-argstr[0].from,
 462                                                 GFP_KERNEL);
 463                         break;
 464
 465                         /* misc */
 466                 case Opt_wsize:
 467                         args->wsize = intval;
 468                         break;
 469                 case Opt_rsize:
 470                         args->rsize = intval;
 471                         break;
 472                 case Opt_osdtimeout:
 473                         args->osd_timeout = intval;
 474                         break;
 475                 case Opt_osdkeepalivetimeout:
 476                         args->osd_keepalive_timeout = intval;
 477                         break;
 478                 case Opt_mount_timeout:
 479                         args->mount_timeout = intval;
 480                         break;
 481                 case Opt_caps_wanted_delay_min:
 482                         args->caps_wanted_delay_min = intval;
 483                         break;
 484                 case Opt_caps_wanted_delay_max:
 485                         args->caps_wanted_delay_max = intval;
 486                         break;
 487                 case Opt_readdir_max_entries:
 488                         args->max_readdir = intval;
 489                         break;
 490                 case Opt_congestion_kb:
 491                         args->congestion_kb = intval;
 492                         break;
 493
 494                 case Opt_noshare:
 495                         args->flags |= CEPH_OPT_NOSHARE;
 496                         break;
 497
 498                 case Opt_dirstat:
 499                         args->flags |= CEPH_OPT_DIRSTAT;
 500                         break;
 501                 case Opt_nodirstat:
 502                         args->flags &= ~CEPH_OPT_DIRSTAT;
 503                         break;
 504                 case Opt_rbytes:
 505                         args->flags |= CEPH_OPT_RBYTES;
 506                         break;
 507                 case Opt_norbytes:
 508                         args->flags &= ~CEPH_OPT_RBYTES;
 509                         break;
 510                 case Opt_nocrc:
 511                         args->flags |= CEPH_OPT_NOCRC;
 512                         break;
 513                 case Opt_noasyncreaddir:
 514                         args->flags |= CEPH_OPT_NOASYNCREADDIR;
 515                         break;
 516
 517                 default:
 518                         BUG_ON(token);
 519                 }
 520         }
 521         return args;
 522
 523 out:
 524         kfree(args->mon_addr);
 525         kfree(args);
 526         return ERR_PTR(err);
 527 }
 528
 529 static void destroy_mount_args(struct ceph_mount_args *args)
 530 {
 531         dout("destroy_mount_args %p\n", args);
 532         kfree(args->snapdir_name);
 533         args->snapdir_name = NULL;
 534         kfree(args->name);
 535         args->name = NULL;
 536         kfree(args->secret);
 537         args->secret = NULL;
 538         kfree(args);
 539 }
 540
 541 /*
 542  * create a fresh client instance
 543  */
 544 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
 545 {
 546         struct ceph_client *client;
 547         int err = -ENOMEM;
 548
 549         client = kzalloc(sizeof(*client), GFP_KERNEL);
 550         if (client == NULL)
 551                 return ERR_PTR(-ENOMEM);
 552
 553         mutex_init(&client->mount_mutex);
 554
 555         init_waitqueue_head(&client->auth_wq);
 556
 557         client->sb = NULL;
 558         client->mount_state = CEPH_MOUNT_MOUNTING;
 559         client->mount_args = args;
 560
 561         client->msgr = NULL;
 562
 563         client->auth_err = 0;
 564         atomic_long_set(&client->writeback_count, 0);
 565
 566         err = bdi_init(&client->backing_dev_info);
 567         if (err < 0)
 568                 goto fail;
 569
 570         err = -ENOMEM;
 571         client->wb_wq = create_workqueue("ceph-writeback");
 572         if (client->wb_wq == NULL)
 573                 goto fail_bdi;
 574         client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
 575         if (client->pg_inv_wq == NULL)
 576                 goto fail_wb_wq;
 577         client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
 578         if (client->trunc_wq == NULL)
 579                 goto fail_pg_inv_wq;
 580
 581         /* set up mempools */
 582         err = -ENOMEM;
 583         client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
 584                               client->mount_args->wsize >> PAGE_CACHE_SHIFT);
 585         if (!client->wb_pagevec_pool)
 586                 goto fail_trunc_wq;
 587
 588         /* caps */
 589         client->min_caps = args->max_readdir;
 590         ceph_adjust_min_caps(client->min_caps);
 591
 592         /* subsystems */
 593         err = ceph_monc_init(&client->monc, client);
 594         if (err < 0)
 595                 goto fail_mempool;
 596         err = ceph_osdc_init(&client->osdc, client);
 597         if (err < 0)
 598                 goto fail_monc;
 599         err = ceph_mdsc_init(&client->mdsc, client);
 600         if (err < 0)
 601                 goto fail_osdc;
 602         return client;
 603
 604 fail_osdc:
 605         ceph_osdc_stop(&client->osdc);
 606 fail_monc:
 607         ceph_monc_stop(&client->monc);
 608 fail_mempool:
 609         mempool_destroy(client->wb_pagevec_pool);
 610 fail_trunc_wq:
 611         destroy_workqueue(client->trunc_wq);
 612 fail_pg_inv_wq:
 613         destroy_workqueue(client->pg_inv_wq);
 614 fail_wb_wq:
 615         destroy_workqueue(client->wb_wq);
 616 fail_bdi:
 617         bdi_destroy(&client->backing_dev_info);
 618 fail:
 619         kfree(client);
 620         return ERR_PTR(err);
 621 }
 622
 623 static void ceph_destroy_client(struct ceph_client *client)
 624 {
 625         dout("destroy_client %p\n", client);
 626
 627         /* unmount */
 628         ceph_mdsc_stop(&client->mdsc);
 629         ceph_monc_stop(&client->monc);
 630         ceph_osdc_stop(&client->osdc);
 631
 632         ceph_adjust_min_caps(-client->min_caps);
 633
 634         ceph_debugfs_client_cleanup(client);
 635         destroy_workqueue(client->wb_wq);
 636         destroy_workqueue(client->pg_inv_wq);
 637         destroy_workqueue(client->trunc_wq);
 638
 639         if (client->msgr)
 640                 ceph_messenger_destroy(client->msgr);
 641         mempool_destroy(client->wb_pagevec_pool);
 642
 643         destroy_mount_args(client->mount_args);
 644
 645         kfree(client);
 646         dout("destroy_client %p done\n", client);
 647 }
 648
 649 /*
 650  * Initially learn our fsid, or verify an fsid matches.
 651  */
 652 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
 653 {
 654         if (client->have_fsid) {
 655                 if (ceph_fsid_compare(&client->fsid, fsid)) {
 656                         pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
 657                                PR_FSID(&client->fsid), PR_FSID(fsid));
 658                         return -1;
 659                 }
 660         } else {
 661                 pr_info("client%lld fsid " FSID_FORMAT "\n",
 662                         client->monc.auth->global_id, PR_FSID(fsid));
 663                 memcpy(&client->fsid, fsid, sizeof(*fsid));
 664                 ceph_debugfs_client_init(client);
 665                 client->have_fsid = true;
 666         }
 667         return 0;
 668 }
 669
 670 /*
 671  * true if we have the mon map (and have thus joined the cluster)
 672  */
 673 static int have_mon_map(struct ceph_client *client)
 674 {
 675         return client->monc.monmap && client->monc.monmap->epoch;
 676 }
 677
 678 /*
 679  * Bootstrap mount by opening the root directory.  Note the mount
 680  * @started time from caller, and time out if this takes too long.
 681  */
 682 static struct dentry *open_root_dentry(struct ceph_client *client,
 683                                        const char *path,
 684                                        unsigned long started)
 685 {
 686         struct ceph_mds_client *mdsc = &client->mdsc;
 687         struct ceph_mds_request *req = NULL;
 688         int err;
 689         struct dentry *root;
 690
 691         /* open dir */
 692         dout("open_root_inode opening '%s'\n", path);
 693         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 694         if (IS_ERR(req))
 695                 return ERR_PTR(PTR_ERR(req));
 696         req->r_path1 = kstrdup(path, GFP_NOFS);
 697         req->r_ino1.ino = CEPH_INO_ROOT;
 698         req->r_ino1.snap = CEPH_NOSNAP;
 699         req->r_started = started;
 700         req->r_timeout = client->mount_args->mount_timeout * HZ;
 701         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 702         req->r_num_caps = 2;
 703         err = ceph_mdsc_do_request(mdsc, NULL, req);
 704         if (err == 0) {
 705                 dout("open_root_inode success\n");
 706                 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
 707                     client->sb->s_root == NULL)
 708                         root = d_alloc_root(req->r_target_inode);
 709                 else
 710                         root = d_obtain_alias(req->r_target_inode);
 711                 req->r_target_inode = NULL;
 712                 dout("open_root_inode success, root dentry is %p\n", root);
 713         } else {
 714                 root = ERR_PTR(err);
 715         }
 716         ceph_mdsc_put_request(req);
 717         return root;
 718 }
 719
 720 /*
 721  * mount: join the ceph cluster, and open root directory.
 722  */
 723 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
 724                       const char *path)
 725 {
 726         struct ceph_entity_addr *myaddr = NULL;
 727         int err;
 728         unsigned long timeout = client->mount_args->mount_timeout * HZ;
 729         unsigned long started = jiffies;  /* note the start time */
 730         struct dentry *root;
 731
 732         dout("mount start\n");
 733         mutex_lock(&client->mount_mutex);
 734
 735         /* initialize the messenger */
 736         if (client->msgr == NULL) {
 737                 if (ceph_test_opt(client, MYIP))
 738                         myaddr = &client->mount_args->my_addr;
 739                 client->msgr = ceph_messenger_create(myaddr);
 740                 if (IS_ERR(client->msgr)) {
 741                         err = PTR_ERR(client->msgr);
 742                         client->msgr = NULL;
 743                         goto out;
 744                 }
 745                 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
 746         }
 747
 748         /* open session, and wait for mon, mds, and osd maps */
 749         err = ceph_monc_open_session(&client->monc);
 750         if (err < 0)
 751                 goto out;
 752
 753         while (!have_mon_map(client)) {
 754                 err = -EIO;
 755                 if (timeout && time_after_eq(jiffies, started + timeout))
 756                         goto out;
 757
 758                 /* wait */
 759                 dout("mount waiting for mon_map\n");
 760                 err = wait_event_interruptible_timeout(client->auth_wq,
 761                                have_mon_map(client) || (client->auth_err < 0),
 762                                timeout);
 763                 if (err == -EINTR || err == -ERESTARTSYS)
 764                         goto out;
 765                 if (client->auth_err < 0) {
 766                         err = client->auth_err;
 767                         goto out;
 768                 }
 769         }
 770
 771         dout("mount opening root\n");
 772         root = open_root_dentry(client, "", started);
 773         if (IS_ERR(root)) {
 774                 err = PTR_ERR(root);
 775                 goto out;
 776         }
 777         if (client->sb->s_root)
 778                 dput(root);
 779         else
 780                 client->sb->s_root = root;
 781
 782         if (path[0] == 0) {
 783                 dget(root);
 784         } else {
 785                 dout("mount opening base mountpoint\n");
 786                 root = open_root_dentry(client, path, started);
 787                 if (IS_ERR(root)) {
 788                         err = PTR_ERR(root);
 789                         dput(client->sb->s_root);
 790                         client->sb->s_root = NULL;
 791                         goto out;
 792                 }
 793         }
 794
 795         mnt->mnt_root = root;
 796         mnt->mnt_sb = client->sb;
 797
 798         client->mount_state = CEPH_MOUNT_MOUNTED;
 799         dout("mount success\n");
 800         err = 0;
 801
 802 out:
 803         mutex_unlock(&client->mount_mutex);
 804         return err;
 805 }
 806
 807 static int ceph_set_super(struct super_block *s, void *data)
 808 {
 809         struct ceph_client *client = data;
 810         int ret;
 811
 812         dout("set_super %p data %p\n", s, data);
 813
 814         s->s_flags = client->mount_args->sb_flags;
 815         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 816
 817         s->s_fs_info = client;
 818         client->sb = s;
 819
 820         s->s_op = &ceph_super_ops;
 821         s->s_export_op = &ceph_export_ops;
 822
 823         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 824
 825         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 826         if (ret != 0)
 827                 goto fail;
 828
 829         return ret;
 830
 831 fail:
 832         s->s_fs_info = NULL;
 833         client->sb = NULL;
 834         return ret;
 835 }
 836
 837 /*
 838  * share superblock if same fs AND options
 839  */
 840 static int ceph_compare_super(struct super_block *sb, void *data)
 841 {
 842         struct ceph_client *new = data;
 843         struct ceph_mount_args *args = new->mount_args;
 844         struct ceph_client *other = ceph_sb_to_client(sb);
 845         int i;
 846
 847         dout("ceph_compare_super %p\n", sb);
 848         if (args->flags & CEPH_OPT_FSID) {
 849                 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
 850                         dout("fsid doesn't match\n");
 851                         return 0;
 852                 }
 853         } else {
 854                 /* do we share (a) monitor? */
 855                 for (i = 0; i < new->monc.monmap->num_mon; i++)
 856                         if (ceph_monmap_contains(other->monc.monmap,
 857                                          &new->monc.monmap->mon_inst[i].addr))
 858                                 break;
 859                 if (i == new->monc.monmap->num_mon) {
 860                         dout("mon ip not part of monmap\n");
 861                         return 0;
 862                 }
 863                 dout("mon ip matches existing sb %p\n", sb);
 864         }
 865         if (args->sb_flags != other->mount_args->sb_flags) {
 866                 dout("flags differ\n");
 867                 return 0;
 868         }
 869         return 1;
 870 }
 871
 872 /*
 873  * construct our own bdi so we can control readahead, etc.
 874  */
 875 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
 876 {
 877         int err;
 878
 879         sb->s_bdi = &client->backing_dev_info;
 880
 881         /* set ra_pages based on rsize mount option? */
 882         if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
 883                 client->backing_dev_info.ra_pages =
 884                         (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
 885                         >> PAGE_SHIFT;
 886         err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
 887         return err;
 888 }
 889
 890 static int ceph_get_sb(struct file_system_type *fs_type,
 891                        int flags, const char *dev_name, void *data,
 892                        struct vfsmount *mnt)
 893 {
 894         struct super_block *sb;
 895         struct ceph_client *client;
 896         int err;
 897         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 898         const char *path = NULL;
 899         struct ceph_mount_args *args;
 900
 901         dout("ceph_get_sb\n");
 902         args = parse_mount_args(flags, data, dev_name, &path);
 903         if (IS_ERR(args)) {
 904                 err = PTR_ERR(args);
 905                 goto out_final;
 906         }
 907
 908         /* create client (which we may/may not use) */
 909         client = ceph_create_client(args);
 910         if (IS_ERR(client)) {
 911                 err = PTR_ERR(client);
 912                 goto out_final;
 913         }
 914
 915         if (client->mount_args->flags & CEPH_OPT_NOSHARE)
 916                 compare_super = NULL;
 917         sb = sget(fs_type, compare_super, ceph_set_super, client);
 918         if (IS_ERR(sb)) {
 919                 err = PTR_ERR(sb);
 920                 goto out;
 921         }
 922
 923         if (ceph_client(sb) != client) {
 924                 ceph_destroy_client(client);
 925                 client = ceph_client(sb);
 926                 dout("get_sb got existing client %p\n", client);
 927         } else {
 928                 dout("get_sb using new client %p\n", client);
 929                 err = ceph_register_bdi(sb, client);
 930                 if (err < 0)
 931                         goto out_splat;
 932         }
 933
 934         err = ceph_mount(client, mnt, path);
 935         if (err < 0)
 936                 goto out_splat;
 937         dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
 938              mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
 939         return 0;
 940
 941 out_splat:
 942         ceph_mdsc_close_sessions(&client->mdsc);
 943         up_write(&sb->s_umount);
 944         deactivate_super(sb);
 945         goto out_final;
 946
 947 out:
 948         ceph_destroy_client(client);
 949 out_final:
 950         dout("ceph_get_sb fail %d\n", err);
 951         return err;
 952 }
 953
 954 static void ceph_kill_sb(struct super_block *s)
 955 {
 956         struct ceph_client *client = ceph_sb_to_client(s);
 957         dout("kill_sb %p\n", s);
 958         ceph_mdsc_pre_umount(&client->mdsc);
 959         kill_anon_super(s);    /* will call put_super after sb is r/o */
 960         if (s->s_bdi == &client->backing_dev_info)
 961                 bdi_unregister(&client->backing_dev_info);
 962         bdi_destroy(&client->backing_dev_info);
 963         ceph_destroy_client(client);
 964 }
 965
 966 static struct file_system_type ceph_fs_type = {
 967         .owner          = THIS_MODULE,
 968         .name           = "ceph",
 969         .get_sb         = ceph_get_sb,
 970         .kill_sb        = ceph_kill_sb,
 971         .fs_flags       = FS_RENAME_DOES_D_MOVE,
 972 };
 973
 974 #define _STRINGIFY(x) #x
 975 #define STRINGIFY(x) _STRINGIFY(x)
 976
 977 static int __init init_ceph(void)
 978 {
 979         int ret = 0;
 980
 981         ret = ceph_debugfs_init();
 982         if (ret < 0)
 983                 goto out;
 984
 985         ret = ceph_msgr_init();
 986         if (ret < 0)
 987                 goto out_debugfs;
 988
 989         ret = init_caches();
 990         if (ret)
 991                 goto out_msgr;
 992
 993         ceph_caps_init();
 994
 995         ret = register_filesystem(&ceph_fs_type);
 996         if (ret)
 997                 goto out_icache;
 998
 999         pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n",
1000                 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH,
1001                 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL);
1002         return 0;
1003
1004 out_icache:
1005         destroy_caches();
1006 out_msgr:
1007         ceph_msgr_exit();
1008 out_debugfs:
1009         ceph_debugfs_cleanup();
1010 out:
1011         return ret;
1012 }
1013
1014 static void __exit exit_ceph(void)
1015 {
1016         dout("exit_ceph\n");
1017         unregister_filesystem(&ceph_fs_type);
1018         ceph_caps_finalize();
1019         destroy_caches();
1020         ceph_msgr_exit();
1021         ceph_debugfs_cleanup();
1022 }
1023
1024 module_init(init_ceph);
1025 module_exit(exit_ceph);
1026
1027 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1028 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1029 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1030 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1031 MODULE_LICENSE("GPL");