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 *client = ceph_sb_to_client(s);
  51
  52         dout("put_super\n");
  53         ceph_mdsc_close_sessions(&client->mdsc);
  54
  55         /*
  56          * ensure we release the bdi before put_anon_super releases
  57          * the device name.
  58          */
  59         if (s->s_bdi == &client->backing_dev_info) {
  60                 bdi_unregister(&client->backing_dev_info);
  61                 s->s_bdi = NULL;
  62         }
  63
  64         return;
  65 }
  66
  67 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  68 {
  69         struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
  70         struct ceph_monmap *monmap = client->monc.monmap;
  71         struct ceph_statfs st;
  72         u64 fsid;
  73         int err;
  74
  75         dout("statfs\n");
  76         err = ceph_monc_do_statfs(&client->monc, &st);
  77         if (err < 0)
  78                 return err;
  79
  80         /* fill in kstatfs */
  81         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  82
  83         /*
  84          * express utilization in terms of large blocks to avoid
  85          * overflow on 32-bit machines.
  86          */
  87         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  88         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  89         buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
  90                 (CEPH_BLOCK_SHIFT-10);
  91         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  92
  93         buf->f_files = le64_to_cpu(st.num_objects);
  94         buf->f_ffree = -1;
  95         buf->f_namelen = PATH_MAX;
  96         buf->f_frsize = PAGE_CACHE_SIZE;
  97
  98         /* leave fsid little-endian, regardless of host endianness */
  99         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
 100         buf->f_fsid.val[0] = fsid & 0xffffffff;
 101         buf->f_fsid.val[1] = fsid >> 32;
 102
 103         return 0;
 104 }
 105
 106
 107 static int ceph_syncfs(struct super_block *sb, int wait)
 108 {
 109         dout("sync_fs %d\n", wait);
 110         ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
 111         ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
 112         dout("sync_fs %d done\n", wait);
 113         return 0;
 114 }
 115
 116
 117 /**
 118  * ceph_show_options - Show mount options in /proc/mounts
 119  * @m: seq_file to write to
 120  * @mnt: mount descriptor
 121  */
 122 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
 123 {
 124         struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
 125         struct ceph_mount_args *args = client->mount_args;
 126
 127         if (args->flags & CEPH_OPT_FSID)
 128                 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
 129                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
 130                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
 131         if (args->flags & CEPH_OPT_NOSHARE)
 132                 seq_puts(m, ",noshare");
 133         if (args->flags & CEPH_OPT_DIRSTAT)
 134                 seq_puts(m, ",dirstat");
 135         if ((args->flags & CEPH_OPT_RBYTES) == 0)
 136                 seq_puts(m, ",norbytes");
 137         if (args->flags & CEPH_OPT_NOCRC)
 138                 seq_puts(m, ",nocrc");
 139         if (args->flags & CEPH_OPT_NOASYNCREADDIR)
 140                 seq_puts(m, ",noasyncreaddir");
 141         if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 142                 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
 143         if (args->name)
 144                 seq_printf(m, ",name=%s", args->name);
 145         if (args->secret)
 146                 seq_puts(m, ",secret=<hidden>");
 147         return 0;
 148 }
 149
 150 /*
 151  * caches
 152  */
 153 struct kmem_cache *ceph_inode_cachep;
 154 struct kmem_cache *ceph_cap_cachep;
 155 struct kmem_cache *ceph_dentry_cachep;
 156 struct kmem_cache *ceph_file_cachep;
 157
 158 static void ceph_inode_init_once(void *foo)
 159 {
 160         struct ceph_inode_info *ci = foo;
 161         inode_init_once(&ci->vfs_inode);
 162 }
 163
 164 static int default_congestion_kb(void)
 165 {
 166         int congestion_kb;
 167
 168         /*
 169          * Copied from NFS
 170          *
 171          * congestion size, scale with available memory.
 172          *
 173          *  64MB:    8192k
 174          * 128MB:   11585k
 175          * 256MB:   16384k
 176          * 512MB:   23170k
 177          *   1GB:   32768k
 178          *   2GB:   46340k
 179          *   4GB:   65536k
 180          *   8GB:   92681k
 181          *  16GB:  131072k
 182          *
 183          * This allows larger machines to have larger/more transfers.
 184          * Limit the default to 256M
 185          */
 186         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 187         if (congestion_kb > 256*1024)
 188                 congestion_kb = 256*1024;
 189
 190         return congestion_kb;
 191 }
 192
 193 static int __init init_caches(void)
 194 {
 195         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 196                                       sizeof(struct ceph_inode_info),
 197                                       __alignof__(struct ceph_inode_info),
 198                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 199                                       ceph_inode_init_once);
 200         if (ceph_inode_cachep == NULL)
 201                 return -ENOMEM;
 202
 203         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 204                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 205         if (ceph_cap_cachep == NULL)
 206                 goto bad_cap;
 207
 208         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 209                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 210         if (ceph_dentry_cachep == NULL)
 211                 goto bad_dentry;
 212
 213         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 214                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 215         if (ceph_file_cachep == NULL)
 216                 goto bad_file;
 217
 218         return 0;
 219
 220 bad_file:
 221         kmem_cache_destroy(ceph_dentry_cachep);
 222 bad_dentry:
 223         kmem_cache_destroy(ceph_cap_cachep);
 224 bad_cap:
 225         kmem_cache_destroy(ceph_inode_cachep);
 226         return -ENOMEM;
 227 }
 228
 229 static void destroy_caches(void)
 230 {
 231         kmem_cache_destroy(ceph_inode_cachep);
 232         kmem_cache_destroy(ceph_cap_cachep);
 233         kmem_cache_destroy(ceph_dentry_cachep);
 234         kmem_cache_destroy(ceph_file_cachep);
 235 }
 236
 237
 238 /*
 239  * ceph_umount_begin - initiate forced umount.  Tear down down the
 240  * mount, skipping steps that may hang while waiting for server(s).
 241  */
 242 static void ceph_umount_begin(struct super_block *sb)
 243 {
 244         struct ceph_client *client = ceph_sb_to_client(sb);
 245
 246         dout("ceph_umount_begin - starting forced umount\n");
 247         if (!client)
 248                 return;
 249         client->mount_state = CEPH_MOUNT_SHUTDOWN;
 250         return;
 251 }
 252
 253 static const struct super_operations ceph_super_ops = {
 254         .alloc_inode    = ceph_alloc_inode,
 255         .destroy_inode  = ceph_destroy_inode,
 256         .write_inode    = ceph_write_inode,
 257         .sync_fs        = ceph_syncfs,
 258         .put_super      = ceph_put_super,
 259         .show_options   = ceph_show_options,
 260         .statfs         = ceph_statfs,
 261         .umount_begin   = ceph_umount_begin,
 262 };
 263
 264
 265 const char *ceph_msg_type_name(int type)
 266 {
 267         switch (type) {
 268         case CEPH_MSG_SHUTDOWN: return "shutdown";
 269         case CEPH_MSG_PING: return "ping";
 270         case CEPH_MSG_AUTH: return "auth";
 271         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
 272         case CEPH_MSG_MON_MAP: return "mon_map";
 273         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
 274         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
 275         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
 276         case CEPH_MSG_STATFS: return "statfs";
 277         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
 278         case CEPH_MSG_MDS_MAP: return "mds_map";
 279         case CEPH_MSG_CLIENT_SESSION: return "client_session";
 280         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
 281         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
 282         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
 283         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
 284         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
 285         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
 286         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
 287         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
 288         case CEPH_MSG_OSD_MAP: return "osd_map";
 289         case CEPH_MSG_OSD_OP: return "osd_op";
 290         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
 291         default: return "unknown";
 292         }
 293 }
 294
 295
 296 /*
 297  * mount options
 298  */
 299 enum {
 300         Opt_fsidmajor,
 301         Opt_fsidminor,
 302         Opt_monport,
 303         Opt_wsize,
 304         Opt_rsize,
 305         Opt_osdtimeout,
 306         Opt_osdkeepalivetimeout,
 307         Opt_mount_timeout,
 308         Opt_osd_idle_ttl,
 309         Opt_caps_wanted_delay_min,
 310         Opt_caps_wanted_delay_max,
 311         Opt_readdir_max_entries,
 312         Opt_congestion_kb,
 313         Opt_last_int,
 314         /* int args above */
 315         Opt_snapdirname,
 316         Opt_name,
 317         Opt_secret,
 318         Opt_last_string,
 319         /* string args above */
 320         Opt_ip,
 321         Opt_noshare,
 322         Opt_dirstat,
 323         Opt_nodirstat,
 324         Opt_rbytes,
 325         Opt_norbytes,
 326         Opt_nocrc,
 327         Opt_noasyncreaddir,
 328 };
 329
 330 static match_table_t arg_tokens = {
 331         {Opt_fsidmajor, "fsidmajor=%ld"},
 332         {Opt_fsidminor, "fsidminor=%ld"},
 333         {Opt_monport, "monport=%d"},
 334         {Opt_wsize, "wsize=%d"},
 335         {Opt_rsize, "rsize=%d"},
 336         {Opt_osdtimeout, "osdtimeout=%d"},
 337         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
 338         {Opt_mount_timeout, "mount_timeout=%d"},
 339         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
 340         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 341         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 342         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 343         {Opt_congestion_kb, "write_congestion_kb=%d"},
 344         /* int args above */
 345         {Opt_snapdirname, "snapdirname=%s"},
 346         {Opt_name, "name=%s"},
 347         {Opt_secret, "secret=%s"},
 348         /* string args above */
 349         {Opt_ip, "ip=%s"},
 350         {Opt_noshare, "noshare"},
 351         {Opt_dirstat, "dirstat"},
 352         {Opt_nodirstat, "nodirstat"},
 353         {Opt_rbytes, "rbytes"},
 354         {Opt_norbytes, "norbytes"},
 355         {Opt_nocrc, "nocrc"},
 356         {Opt_noasyncreaddir, "noasyncreaddir"},
 357         {-1, NULL}
 358 };
 359
 360
 361 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
 362                                                 const char *dev_name,
 363                                                 const char **path)
 364 {
 365         struct ceph_mount_args *args;
 366         const char *c;
 367         int err = -ENOMEM;
 368         substring_t argstr[MAX_OPT_ARGS];
 369
 370         args = kzalloc(sizeof(*args), GFP_KERNEL);
 371         if (!args)
 372                 return ERR_PTR(-ENOMEM);
 373         args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
 374                                  GFP_KERNEL);
 375         if (!args->mon_addr)
 376                 goto out;
 377
 378         dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
 379
 380         /* start with defaults */
 381         args->sb_flags = flags;
 382         args->flags = CEPH_OPT_DEFAULT;
 383         args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
 384         args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
 385         args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
 386         args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */
 387         args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 388         args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 389         args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
 390         args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 391         args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
 392         args->max_readdir = 1024;
 393         args->congestion_kb = default_congestion_kb();
 394
 395         /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
 396         err = -EINVAL;
 397         if (!dev_name)
 398                 goto out;
 399         *path = strstr(dev_name, ":/");
 400         if (*path == NULL) {
 401                 pr_err("device name is missing path (no :/ in %s)\n",
 402                        dev_name);
 403                 goto out;
 404         }
 405
 406         /* get mon ip(s) */
 407         err = ceph_parse_ips(dev_name, *path, args->mon_addr,
 408                              CEPH_MAX_MON, &args->num_mon);
 409         if (err < 0)
 410                 goto out;
 411
 412         /* path on server */
 413         *path += 2;
 414         dout("server path '%s'\n", *path);
 415
 416         /* parse mount options */
 417         while ((c = strsep(&options, ",")) != NULL) {
 418                 int token, intval, ret;
 419                 if (!*c)
 420                         continue;
 421                 err = -EINVAL;
 422                 token = match_token((char *)c, arg_tokens, argstr);
 423                 if (token < 0) {
 424                         pr_err("bad mount option at '%s'\n", c);
 425                         goto out;
 426                 }
 427                 if (token < Opt_last_int) {
 428                         ret = match_int(&argstr[0], &intval);
 429                         if (ret < 0) {
 430                                 pr_err("bad mount option arg (not int) "
 431                                        "at '%s'\n", c);
 432                                 continue;
 433                         }
 434                         dout("got int token %d val %d\n", token, intval);
 435                 } else if (token > Opt_last_int && token < Opt_last_string) {
 436                         dout("got string token %d val %s\n", token,
 437                              argstr[0].from);
 438                 } else {
 439                         dout("got token %d\n", token);
 440                 }
 441                 switch (token) {
 442                 case Opt_fsidmajor:
 443                         *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
 444                         break;
 445                 case Opt_fsidminor:
 446                         *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
 447                         break;
 448                 case Opt_ip:
 449                         err = ceph_parse_ips(argstr[0].from,
 450                                              argstr[0].to,
 451                                              &args->my_addr,
 452                                              1, NULL);
 453                         if (err < 0)
 454                                 goto out;
 455                         args->flags |= CEPH_OPT_MYIP;
 456                         break;
 457
 458                 case Opt_snapdirname:
 459                         kfree(args->snapdir_name);
 460                         args->snapdir_name = kstrndup(argstr[0].from,
 461                                               argstr[0].to-argstr[0].from,
 462                                               GFP_KERNEL);
 463                         break;
 464                 case Opt_name:
 465                         args->name = kstrndup(argstr[0].from,
 466                                               argstr[0].to-argstr[0].from,
 467                                               GFP_KERNEL);
 468                         break;
 469                 case Opt_secret:
 470                         args->secret = kstrndup(argstr[0].from,
 471                                                 argstr[0].to-argstr[0].from,
 472                                                 GFP_KERNEL);
 473                         break;
 474
 475                         /* misc */
 476                 case Opt_wsize:
 477                         args->wsize = intval;
 478                         break;
 479                 case Opt_rsize:
 480                         args->rsize = intval;
 481                         break;
 482                 case Opt_osdtimeout:
 483                         args->osd_timeout = intval;
 484                         break;
 485                 case Opt_osdkeepalivetimeout:
 486                         args->osd_keepalive_timeout = intval;
 487                         break;
 488                 case Opt_mount_timeout:
 489                         args->mount_timeout = intval;
 490                         break;
 491                 case Opt_caps_wanted_delay_min:
 492                         args->caps_wanted_delay_min = intval;
 493                         break;
 494                 case Opt_caps_wanted_delay_max:
 495                         args->caps_wanted_delay_max = intval;
 496                         break;
 497                 case Opt_readdir_max_entries:
 498                         args->max_readdir = intval;
 499                         break;
 500                 case Opt_congestion_kb:
 501                         args->congestion_kb = intval;
 502                         break;
 503
 504                 case Opt_noshare:
 505                         args->flags |= CEPH_OPT_NOSHARE;
 506                         break;
 507
 508                 case Opt_dirstat:
 509                         args->flags |= CEPH_OPT_DIRSTAT;
 510                         break;
 511                 case Opt_nodirstat:
 512                         args->flags &= ~CEPH_OPT_DIRSTAT;
 513                         break;
 514                 case Opt_rbytes:
 515                         args->flags |= CEPH_OPT_RBYTES;
 516                         break;
 517                 case Opt_norbytes:
 518                         args->flags &= ~CEPH_OPT_RBYTES;
 519                         break;
 520                 case Opt_nocrc:
 521                         args->flags |= CEPH_OPT_NOCRC;
 522                         break;
 523                 case Opt_noasyncreaddir:
 524                         args->flags |= CEPH_OPT_NOASYNCREADDIR;
 525                         break;
 526
 527                 default:
 528                         BUG_ON(token);
 529                 }
 530         }
 531         return args;
 532
 533 out:
 534         kfree(args->mon_addr);
 535         kfree(args);
 536         return ERR_PTR(err);
 537 }
 538
 539 static void destroy_mount_args(struct ceph_mount_args *args)
 540 {
 541         dout("destroy_mount_args %p\n", args);
 542         kfree(args->snapdir_name);
 543         args->snapdir_name = NULL;
 544         kfree(args->name);
 545         args->name = NULL;
 546         kfree(args->secret);
 547         args->secret = NULL;
 548         kfree(args);
 549 }
 550
 551 /*
 552  * create a fresh client instance
 553  */
 554 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
 555 {
 556         struct ceph_client *client;
 557         int err = -ENOMEM;
 558
 559         client = kzalloc(sizeof(*client), GFP_KERNEL);
 560         if (client == NULL)
 561                 return ERR_PTR(-ENOMEM);
 562
 563         mutex_init(&client->mount_mutex);
 564
 565         init_waitqueue_head(&client->auth_wq);
 566
 567         client->sb = NULL;
 568         client->mount_state = CEPH_MOUNT_MOUNTING;
 569         client->mount_args = args;
 570
 571         client->msgr = NULL;
 572
 573         client->auth_err = 0;
 574         atomic_long_set(&client->writeback_count, 0);
 575
 576         err = bdi_init(&client->backing_dev_info);
 577         if (err < 0)
 578                 goto fail;
 579
 580         err = -ENOMEM;
 581         client->wb_wq = create_workqueue("ceph-writeback");
 582         if (client->wb_wq == NULL)
 583                 goto fail_bdi;
 584         client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
 585         if (client->pg_inv_wq == NULL)
 586                 goto fail_wb_wq;
 587         client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
 588         if (client->trunc_wq == NULL)
 589                 goto fail_pg_inv_wq;
 590
 591         /* set up mempools */
 592         err = -ENOMEM;
 593         client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
 594                               client->mount_args->wsize >> PAGE_CACHE_SHIFT);
 595         if (!client->wb_pagevec_pool)
 596                 goto fail_trunc_wq;
 597
 598         /* caps */
 599         client->min_caps = args->max_readdir;
 600         ceph_adjust_min_caps(client->min_caps);
 601
 602         /* subsystems */
 603         err = ceph_monc_init(&client->monc, client);
 604         if (err < 0)
 605                 goto fail_mempool;
 606         err = ceph_osdc_init(&client->osdc, client);
 607         if (err < 0)
 608                 goto fail_monc;
 609         err = ceph_mdsc_init(&client->mdsc, client);
 610         if (err < 0)
 611                 goto fail_osdc;
 612         return client;
 613
 614 fail_osdc:
 615         ceph_osdc_stop(&client->osdc);
 616 fail_monc:
 617         ceph_monc_stop(&client->monc);
 618 fail_mempool:
 619         mempool_destroy(client->wb_pagevec_pool);
 620 fail_trunc_wq:
 621         destroy_workqueue(client->trunc_wq);
 622 fail_pg_inv_wq:
 623         destroy_workqueue(client->pg_inv_wq);
 624 fail_wb_wq:
 625         destroy_workqueue(client->wb_wq);
 626 fail_bdi:
 627         bdi_destroy(&client->backing_dev_info);
 628 fail:
 629         kfree(client);
 630         return ERR_PTR(err);
 631 }
 632
 633 static void ceph_destroy_client(struct ceph_client *client)
 634 {
 635         dout("destroy_client %p\n", client);
 636
 637         /* unmount */
 638         ceph_mdsc_stop(&client->mdsc);
 639         ceph_monc_stop(&client->monc);
 640         ceph_osdc_stop(&client->osdc);
 641
 642         ceph_adjust_min_caps(-client->min_caps);
 643
 644         ceph_debugfs_client_cleanup(client);
 645         destroy_workqueue(client->wb_wq);
 646         destroy_workqueue(client->pg_inv_wq);
 647         destroy_workqueue(client->trunc_wq);
 648
 649         bdi_destroy(&client->backing_dev_info);
 650
 651         if (client->msgr)
 652                 ceph_messenger_destroy(client->msgr);
 653         mempool_destroy(client->wb_pagevec_pool);
 654
 655         destroy_mount_args(client->mount_args);
 656
 657         kfree(client);
 658         dout("destroy_client %p done\n", client);
 659 }
 660
 661 /*
 662  * Initially learn our fsid, or verify an fsid matches.
 663  */
 664 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
 665 {
 666         if (client->have_fsid) {
 667                 if (ceph_fsid_compare(&client->fsid, fsid)) {
 668                         pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
 669                                PR_FSID(&client->fsid), PR_FSID(fsid));
 670                         return -1;
 671                 }
 672         } else {
 673                 pr_info("client%lld fsid " FSID_FORMAT "\n",
 674                         client->monc.auth->global_id, PR_FSID(fsid));
 675                 memcpy(&client->fsid, fsid, sizeof(*fsid));
 676                 ceph_debugfs_client_init(client);
 677                 client->have_fsid = true;
 678         }
 679         return 0;
 680 }
 681
 682 /*
 683  * true if we have the mon map (and have thus joined the cluster)
 684  */
 685 static int have_mon_and_osd_map(struct ceph_client *client)
 686 {
 687         return client->monc.monmap && client->monc.monmap->epoch &&
 688                client->osdc.osdmap && client->osdc.osdmap->epoch;
 689 }
 690
 691 /*
 692  * Bootstrap mount by opening the root directory.  Note the mount
 693  * @started time from caller, and time out if this takes too long.
 694  */
 695 static struct dentry *open_root_dentry(struct ceph_client *client,
 696                                        const char *path,
 697                                        unsigned long started)
 698 {
 699         struct ceph_mds_client *mdsc = &client->mdsc;
 700         struct ceph_mds_request *req = NULL;
 701         int err;
 702         struct dentry *root;
 703
 704         /* open dir */
 705         dout("open_root_inode opening '%s'\n", path);
 706         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 707         if (IS_ERR(req))
 708                 return ERR_PTR(PTR_ERR(req));
 709         req->r_path1 = kstrdup(path, GFP_NOFS);
 710         req->r_ino1.ino = CEPH_INO_ROOT;
 711         req->r_ino1.snap = CEPH_NOSNAP;
 712         req->r_started = started;
 713         req->r_timeout = client->mount_args->mount_timeout * HZ;
 714         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 715         req->r_num_caps = 2;
 716         err = ceph_mdsc_do_request(mdsc, NULL, req);
 717         if (err == 0) {
 718                 dout("open_root_inode success\n");
 719                 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
 720                     client->sb->s_root == NULL)
 721                         root = d_alloc_root(req->r_target_inode);
 722                 else
 723                         root = d_obtain_alias(req->r_target_inode);
 724                 req->r_target_inode = NULL;
 725                 dout("open_root_inode success, root dentry is %p\n", root);
 726         } else {
 727                 root = ERR_PTR(err);
 728         }
 729         ceph_mdsc_put_request(req);
 730         return root;
 731 }
 732
 733 /*
 734  * mount: join the ceph cluster, and open root directory.
 735  */
 736 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
 737                       const char *path)
 738 {
 739         struct ceph_entity_addr *myaddr = NULL;
 740         int err;
 741         unsigned long timeout = client->mount_args->mount_timeout * HZ;
 742         unsigned long started = jiffies;  /* note the start time */
 743         struct dentry *root;
 744
 745         dout("mount start\n");
 746         mutex_lock(&client->mount_mutex);
 747
 748         /* initialize the messenger */
 749         if (client->msgr == NULL) {
 750                 if (ceph_test_opt(client, MYIP))
 751                         myaddr = &client->mount_args->my_addr;
 752                 client->msgr = ceph_messenger_create(myaddr);
 753                 if (IS_ERR(client->msgr)) {
 754                         err = PTR_ERR(client->msgr);
 755                         client->msgr = NULL;
 756                         goto out;
 757                 }
 758                 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
 759         }
 760
 761         /* open session, and wait for mon, mds, and osd maps */
 762         err = ceph_monc_open_session(&client->monc);
 763         if (err < 0)
 764                 goto out;
 765
 766         while (!have_mon_and_osd_map(client)) {
 767                 err = -EIO;
 768                 if (timeout && time_after_eq(jiffies, started + timeout))
 769                         goto out;
 770
 771                 /* wait */
 772                 dout("mount waiting for mon_map\n");
 773                 err = wait_event_interruptible_timeout(client->auth_wq,
 774                        have_mon_and_osd_map(client) || (client->auth_err < 0),
 775                        timeout);
 776                 if (err == -EINTR || err == -ERESTARTSYS)
 777                         goto out;
 778                 if (client->auth_err < 0) {
 779                         err = client->auth_err;
 780                         goto out;
 781                 }
 782         }
 783
 784         dout("mount opening root\n");
 785         root = open_root_dentry(client, "", started);
 786         if (IS_ERR(root)) {
 787                 err = PTR_ERR(root);
 788                 goto out;
 789         }
 790         if (client->sb->s_root)
 791                 dput(root);
 792         else
 793                 client->sb->s_root = root;
 794
 795         if (path[0] == 0) {
 796                 dget(root);
 797         } else {
 798                 dout("mount opening base mountpoint\n");
 799                 root = open_root_dentry(client, path, started);
 800                 if (IS_ERR(root)) {
 801                         err = PTR_ERR(root);
 802                         dput(client->sb->s_root);
 803                         client->sb->s_root = NULL;
 804                         goto out;
 805                 }
 806         }
 807
 808         mnt->mnt_root = root;
 809         mnt->mnt_sb = client->sb;
 810
 811         client->mount_state = CEPH_MOUNT_MOUNTED;
 812         dout("mount success\n");
 813         err = 0;
 814
 815 out:
 816         mutex_unlock(&client->mount_mutex);
 817         return err;
 818 }
 819
 820 static int ceph_set_super(struct super_block *s, void *data)
 821 {
 822         struct ceph_client *client = data;
 823         int ret;
 824
 825         dout("set_super %p data %p\n", s, data);
 826
 827         s->s_flags = client->mount_args->sb_flags;
 828         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 829
 830         s->s_fs_info = client;
 831         client->sb = s;
 832
 833         s->s_op = &ceph_super_ops;
 834         s->s_export_op = &ceph_export_ops;
 835
 836         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 837
 838         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 839         if (ret != 0)
 840                 goto fail;
 841
 842         return ret;
 843
 844 fail:
 845         s->s_fs_info = NULL;
 846         client->sb = NULL;
 847         return ret;
 848 }
 849
 850 /*
 851  * share superblock if same fs AND options
 852  */
 853 static int ceph_compare_super(struct super_block *sb, void *data)
 854 {
 855         struct ceph_client *new = data;
 856         struct ceph_mount_args *args = new->mount_args;
 857         struct ceph_client *other = ceph_sb_to_client(sb);
 858         int i;
 859
 860         dout("ceph_compare_super %p\n", sb);
 861         if (args->flags & CEPH_OPT_FSID) {
 862                 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
 863                         dout("fsid doesn't match\n");
 864                         return 0;
 865                 }
 866         } else {
 867                 /* do we share (a) monitor? */
 868                 for (i = 0; i < new->monc.monmap->num_mon; i++)
 869                         if (ceph_monmap_contains(other->monc.monmap,
 870                                          &new->monc.monmap->mon_inst[i].addr))
 871                                 break;
 872                 if (i == new->monc.monmap->num_mon) {
 873                         dout("mon ip not part of monmap\n");
 874                         return 0;
 875                 }
 876                 dout("mon ip matches existing sb %p\n", sb);
 877         }
 878         if (args->sb_flags != other->mount_args->sb_flags) {
 879                 dout("flags differ\n");
 880                 return 0;
 881         }
 882         return 1;
 883 }
 884
 885 /*
 886  * construct our own bdi so we can control readahead, etc.
 887  */
 888 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
 889 {
 890         int err;
 891
 892         /* set ra_pages based on rsize mount option? */
 893         if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
 894                 client->backing_dev_info.ra_pages =
 895                         (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
 896                         >> PAGE_SHIFT;
 897         err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
 898         if (!err)
 899                 sb->s_bdi = &client->backing_dev_info;
 900         return err;
 901 }
 902
 903 static int ceph_get_sb(struct file_system_type *fs_type,
 904                        int flags, const char *dev_name, void *data,
 905                        struct vfsmount *mnt)
 906 {
 907         struct super_block *sb;
 908         struct ceph_client *client;
 909         int err;
 910         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 911         const char *path = NULL;
 912         struct ceph_mount_args *args;
 913
 914         dout("ceph_get_sb\n");
 915         args = parse_mount_args(flags, data, dev_name, &path);
 916         if (IS_ERR(args)) {
 917                 err = PTR_ERR(args);
 918                 goto out_final;
 919         }
 920
 921         /* create client (which we may/may not use) */
 922         client = ceph_create_client(args);
 923         if (IS_ERR(client)) {
 924                 err = PTR_ERR(client);
 925                 goto out_final;
 926         }
 927
 928         if (client->mount_args->flags & CEPH_OPT_NOSHARE)
 929                 compare_super = NULL;
 930         sb = sget(fs_type, compare_super, ceph_set_super, client);
 931         if (IS_ERR(sb)) {
 932                 err = PTR_ERR(sb);
 933                 goto out;
 934         }
 935
 936         if (ceph_sb_to_client(sb) != client) {
 937                 ceph_destroy_client(client);
 938                 client = ceph_sb_to_client(sb);
 939                 dout("get_sb got existing client %p\n", client);
 940         } else {
 941                 dout("get_sb using new client %p\n", client);
 942                 err = ceph_register_bdi(sb, client);
 943                 if (err < 0)
 944                         goto out_splat;
 945         }
 946
 947         err = ceph_mount(client, mnt, path);
 948         if (err < 0)
 949                 goto out_splat;
 950         dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
 951              mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
 952         return 0;
 953
 954 out_splat:
 955         ceph_mdsc_close_sessions(&client->mdsc);
 956         up_write(&sb->s_umount);
 957         deactivate_super(sb);
 958         goto out_final;
 959
 960 out:
 961         ceph_destroy_client(client);
 962 out_final:
 963         dout("ceph_get_sb fail %d\n", err);
 964         return err;
 965 }
 966
 967 static void ceph_kill_sb(struct super_block *s)
 968 {
 969         struct ceph_client *client = ceph_sb_to_client(s);
 970         dout("kill_sb %p\n", s);
 971         ceph_mdsc_pre_umount(&client->mdsc);
 972         kill_anon_super(s);    /* will call put_super after sb is r/o */
 973         ceph_destroy_client(client);
 974 }
 975
 976 static struct file_system_type ceph_fs_type = {
 977         .owner          = THIS_MODULE,
 978         .name           = "ceph",
 979         .get_sb         = ceph_get_sb,
 980         .kill_sb        = ceph_kill_sb,
 981         .fs_flags       = FS_RENAME_DOES_D_MOVE,
 982 };
 983
 984 #define _STRINGIFY(x) #x
 985 #define STRINGIFY(x) _STRINGIFY(x)
 986
 987 static int __init init_ceph(void)
 988 {
 989         int ret = 0;
 990
 991         ret = ceph_debugfs_init();
 992         if (ret < 0)
 993                 goto out;
 994
 995         ret = ceph_msgr_init();
 996         if (ret < 0)
 997                 goto out_debugfs;
 998
 999         ret = init_caches();
1000         if (ret)
1001                 goto out_msgr;
1002
1003         ceph_caps_init();
1004
1005         ret = register_filesystem(&ceph_fs_type);
1006         if (ret)
1007                 goto out_icache;
1008
1009         pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
1010                 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
1011                 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
1012                 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
1013         return 0;
1014
1015 out_icache:
1016         destroy_caches();
1017 out_msgr:
1018         ceph_msgr_exit();
1019 out_debugfs:
1020         ceph_debugfs_cleanup();
1021 out:
1022         return ret;
1023 }
1024
1025 static void __exit exit_ceph(void)
1026 {
1027         dout("exit_ceph\n");
1028         unregister_filesystem(&ceph_fs_type);
1029         ceph_caps_finalize();
1030         destroy_caches();
1031         ceph_msgr_exit();
1032         ceph_debugfs_cleanup();
1033 }
1034
1035 module_init(init_ceph);
1036 module_exit(exit_ceph);
1037
1038 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1039 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1040 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1041 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1042 MODULE_LICENSE("GPL");