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