SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  23 /*
  24  * Ceph superblock operations
  25  *
  26  * Handle the basics of mounting, unmounting.
  27  */
  28
  29
  30 /*
  31  * find filename portion of a path (/foo/bar/baz -> baz)
  32  */
  33 const char *ceph_file_part(const char *s, int len)
  34 {
  35         const char *e = s + len;
  36
  37         while (e != s && *(e-1) != '/')
  38                 e--;
  39         return e;
  40 }
  41
  42
  43 /*
  44  * super ops
  45  */
  46 static void ceph_put_super(struct super_block *s)
  47 {
  48         struct ceph_client *cl = ceph_client(s);
  49
  50         dout("put_super\n");
  51         ceph_mdsc_close_sessions(&cl->mdsc);
  52         return;
  53 }
  54
  55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  56 {
  57         struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
  58         struct ceph_monmap *monmap = client->monc.monmap;
  59         struct ceph_statfs st;
  60         u64 fsid;
  61         int err;
  62
  63         dout("statfs\n");
  64         err = ceph_monc_do_statfs(&client->monc, &st);
  65         if (err < 0)
  66                 return err;
  67
  68         /* fill in kstatfs */
  69         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  70
  71         /*
  72          * express utilization in terms of large blocks to avoid
  73          * overflow on 32-bit machines.
  74          */
  75         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  76         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  77         buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
  78                 (CEPH_BLOCK_SHIFT-10);
  79         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  80
  81         buf->f_files = le64_to_cpu(st.num_objects);
  82         buf->f_ffree = -1;
  83         buf->f_namelen = PATH_MAX;
  84         buf->f_frsize = PAGE_CACHE_SIZE;
  85
  86         /* leave fsid little-endian, regardless of host endianness */
  87         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  88         buf->f_fsid.val[0] = fsid & 0xffffffff;
  89         buf->f_fsid.val[1] = fsid >> 32;
  90
  91         return 0;
  92 }
  93
  94
  95 static int ceph_syncfs(struct super_block *sb, int wait)
  96 {
  97         dout("sync_fs %d\n", wait);
  98         ceph_osdc_sync(&ceph_client(sb)->osdc);
  99         ceph_mdsc_sync(&ceph_client(sb)->mdsc);
 100         dout("sync_fs %d done\n", wait);
 101         return 0;
 102 }
 103
 104
 105 /**
 106  * ceph_show_options - Show mount options in /proc/mounts
 107  * @m: seq_file to write to
 108  * @mnt: mount descriptor
 109  */
 110 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
 111 {
 112         struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
 113         struct ceph_mount_args *args = client->mount_args;
 114
 115         if (args->flags & CEPH_OPT_FSID)
 116                 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
 117                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
 118                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
 119         if (args->flags & CEPH_OPT_NOSHARE)
 120                 seq_puts(m, ",noshare");
 121         if (args->flags & CEPH_OPT_DIRSTAT)
 122                 seq_puts(m, ",dirstat");
 123         if ((args->flags & CEPH_OPT_RBYTES) == 0)
 124                 seq_puts(m, ",norbytes");
 125         if (args->flags & CEPH_OPT_NOCRC)
 126                 seq_puts(m, ",nocrc");
 127         if (args->flags & CEPH_OPT_NOASYNCREADDIR)
 128                 seq_puts(m, ",noasyncreaddir");
 129         if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 130                 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
 131         if (args->secret)
 132                 seq_puts(m, ",secret=<hidden>");
 133         return 0;
 134 }
 135
 136 /*
 137  * caches
 138  */
 139 struct kmem_cache *ceph_inode_cachep;
 140 struct kmem_cache *ceph_cap_cachep;
 141 struct kmem_cache *ceph_dentry_cachep;
 142 struct kmem_cache *ceph_file_cachep;
 143
 144 static void ceph_inode_init_once(void *foo)
 145 {
 146         struct ceph_inode_info *ci = foo;
 147         inode_init_once(&ci->vfs_inode);
 148 }
 149
 150 static int __init init_caches(void)
 151 {
 152         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 153                                       sizeof(struct ceph_inode_info),
 154                                       __alignof__(struct ceph_inode_info),
 155                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 156                                       ceph_inode_init_once);
 157         if (ceph_inode_cachep == NULL)
 158                 return -ENOMEM;
 159
 160         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 161                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 162         if (ceph_cap_cachep == NULL)
 163                 goto bad_cap;
 164
 165         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 166                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 167         if (ceph_dentry_cachep == NULL)
 168                 goto bad_dentry;
 169
 170         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 171                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 172         if (ceph_file_cachep == NULL)
 173                 goto bad_file;
 174
 175         return 0;
 176
 177 bad_file:
 178         kmem_cache_destroy(ceph_dentry_cachep);
 179 bad_dentry:
 180         kmem_cache_destroy(ceph_cap_cachep);
 181 bad_cap:
 182         kmem_cache_destroy(ceph_inode_cachep);
 183         return -ENOMEM;
 184 }
 185
 186 static void destroy_caches(void)
 187 {
 188         kmem_cache_destroy(ceph_inode_cachep);
 189         kmem_cache_destroy(ceph_cap_cachep);
 190         kmem_cache_destroy(ceph_dentry_cachep);
 191         kmem_cache_destroy(ceph_file_cachep);
 192 }
 193
 194
 195 /*
 196  * ceph_umount_begin - initiate forced umount.  Tear down down the
 197  * mount, skipping steps that may hang while waiting for server(s).
 198  */
 199 static void ceph_umount_begin(struct super_block *sb)
 200 {
 201         struct ceph_client *client = ceph_sb_to_client(sb);
 202
 203         dout("ceph_umount_begin - starting forced umount\n");
 204         if (!client)
 205                 return;
 206         client->mount_state = CEPH_MOUNT_SHUTDOWN;
 207         return;
 208 }
 209
 210 static const struct super_operations ceph_super_ops = {
 211         .alloc_inode    = ceph_alloc_inode,
 212         .destroy_inode  = ceph_destroy_inode,
 213         .write_inode    = ceph_write_inode,
 214         .sync_fs        = ceph_syncfs,
 215         .put_super      = ceph_put_super,
 216         .show_options   = ceph_show_options,
 217         .statfs         = ceph_statfs,
 218         .umount_begin   = ceph_umount_begin,
 219 };
 220
 221
 222 const char *ceph_msg_type_name(int type)
 223 {
 224         switch (type) {
 225         case CEPH_MSG_SHUTDOWN: return "shutdown";
 226         case CEPH_MSG_PING: return "ping";
 227         case CEPH_MSG_MON_MAP: return "mon_map";
 228         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
 229         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
 230         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
 231         case CEPH_MSG_CLIENT_MOUNT: return "client_mount";
 232         case CEPH_MSG_CLIENT_MOUNT_ACK: return "client_mount_ack";
 233         case CEPH_MSG_STATFS: return "statfs";
 234         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
 235         case CEPH_MSG_MDS_MAP: return "mds_map";
 236         case CEPH_MSG_CLIENT_SESSION: return "client_session";
 237         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
 238         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
 239         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
 240         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
 241         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
 242         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
 243         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
 244         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
 245         case CEPH_MSG_OSD_MAP: return "osd_map";
 246         case CEPH_MSG_OSD_OP: return "osd_op";
 247         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
 248         default: return "unknown";
 249         }
 250 }
 251
 252
 253 /*
 254  * mount options
 255  */
 256 enum {
 257         Opt_fsidmajor,
 258         Opt_fsidminor,
 259         Opt_monport,
 260         Opt_wsize,
 261         Opt_rsize,
 262         Opt_osdtimeout,
 263         Opt_mount_timeout,
 264         Opt_caps_wanted_delay_min,
 265         Opt_caps_wanted_delay_max,
 266         Opt_readdir_max_entries,
 267         Opt_last_int,
 268         /* int args above */
 269         Opt_snapdirname,
 270         Opt_secret,
 271         Opt_last_string,
 272         /* string args above */
 273         Opt_ip,
 274         Opt_noshare,
 275         Opt_dirstat,
 276         Opt_nodirstat,
 277         Opt_rbytes,
 278         Opt_norbytes,
 279         Opt_nocrc,
 280         Opt_noasyncreaddir,
 281 };
 282
 283 static match_table_t arg_tokens = {
 284         {Opt_fsidmajor, "fsidmajor=%ld"},
 285         {Opt_fsidminor, "fsidminor=%ld"},
 286         {Opt_monport, "monport=%d"},
 287         {Opt_wsize, "wsize=%d"},
 288         {Opt_rsize, "rsize=%d"},
 289         {Opt_osdtimeout, "osdtimeout=%d"},
 290         {Opt_mount_timeout, "mount_timeout=%d"},
 291         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 292         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 293         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 294         /* int args above */
 295         {Opt_snapdirname, "snapdirname=%s"},
 296         {Opt_secret, "secret=%s"},
 297         /* string args above */
 298         {Opt_ip, "ip=%s"},
 299         {Opt_noshare, "noshare"},
 300         {Opt_dirstat, "dirstat"},
 301         {Opt_nodirstat, "nodirstat"},
 302         {Opt_rbytes, "rbytes"},
 303         {Opt_norbytes, "norbytes"},
 304         {Opt_nocrc, "nocrc"},
 305         {Opt_noasyncreaddir, "noasyncreaddir"},
 306         {-1, NULL}
 307 };
 308
 309
 310 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
 311                                                 const char *dev_name,
 312                                                 const char **path)
 313 {
 314         struct ceph_mount_args *args;
 315         const char *c;
 316         int err = -ENOMEM;
 317         substring_t argstr[MAX_OPT_ARGS];
 318
 319         args = kzalloc(sizeof(*args), GFP_KERNEL);
 320         if (!args)
 321                 return ERR_PTR(-ENOMEM);
 322         args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
 323                                  GFP_KERNEL);
 324         if (!args->mon_addr)
 325                 goto out;
 326
 327         dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
 328
 329         /* start with defaults */
 330         args->sb_flags = flags;
 331         args->flags = CEPH_OPT_DEFAULT;
 332         args->osd_timeout = 5;    /* seconds */
 333         args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
 334         args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 335         args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 336         args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
 337         args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 338         args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4;
 339         args->max_readdir = 1024;
 340
 341         /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
 342         err = -EINVAL;
 343         if (!dev_name)
 344                 goto out;
 345         *path = strstr(dev_name, ":/");
 346         if (*path == NULL) {
 347                 pr_err("device name is missing path (no :/ in %s)\n",
 348                        dev_name);
 349                 goto out;
 350         }
 351
 352         /* get mon ip(s) */
 353         err = ceph_parse_ips(dev_name, *path, args->mon_addr,
 354                              CEPH_MAX_MON, &args->num_mon);
 355         if (err < 0)
 356                 goto out;
 357
 358         /* path on server */
 359         *path += 2;
 360         dout("server path '%s'\n", *path);
 361
 362         /* parse mount options */
 363         while ((c = strsep(&options, ",")) != NULL) {
 364                 int token, intval, ret;
 365                 if (!*c)
 366                         continue;
 367                 err = -EINVAL;
 368                 token = match_token((char *)c, arg_tokens, argstr);
 369                 if (token < 0) {
 370                         pr_err("bad mount option at '%s'\n", c);
 371                         goto out;
 372                 }
 373                 if (token < Opt_last_int) {
 374                         ret = match_int(&argstr[0], &intval);
 375                         if (ret < 0) {
 376                                 pr_err("bad mount option arg (not int) "
 377                                        "at '%s'\n", c);
 378                                 continue;
 379                         }
 380                         dout("got int token %d val %d\n", token, intval);
 381                 } else if (token > Opt_last_int && token < Opt_last_string) {
 382                         dout("got string token %d val %s\n", token,
 383                              argstr[0].from);
 384                 } else {
 385                         dout("got token %d\n", token);
 386                 }
 387                 switch (token) {
 388                 case Opt_fsidmajor:
 389                         *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
 390                         break;
 391                 case Opt_fsidminor:
 392                         *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
 393                         break;
 394                 case Opt_ip:
 395                         err = ceph_parse_ips(argstr[0].from,
 396                                              argstr[0].to,
 397                                              &args->my_addr,
 398                                              1, NULL);
 399                         if (err < 0)
 400                                 goto out;
 401                         args->flags |= CEPH_OPT_MYIP;
 402                         break;
 403
 404                 case Opt_snapdirname:
 405                         kfree(args->snapdir_name);
 406                         args->snapdir_name = kstrndup(argstr[0].from,
 407                                               argstr[0].to-argstr[0].from,
 408                                               GFP_KERNEL);
 409                         break;
 410                 case Opt_secret:
 411                         args->secret = kstrndup(argstr[0].from,
 412                                                 argstr[0].to-argstr[0].from,
 413                                                 GFP_KERNEL);
 414                         break;
 415
 416                         /* misc */
 417                 case Opt_wsize:
 418                         args->wsize = intval;
 419                         break;
 420                 case Opt_rsize:
 421                         args->rsize = intval;
 422                         break;
 423                 case Opt_osdtimeout:
 424                         args->osd_timeout = intval;
 425                         break;
 426                 case Opt_mount_timeout:
 427                         args->mount_timeout = intval;
 428                         break;
 429                 case Opt_caps_wanted_delay_min:
 430                         args->caps_wanted_delay_min = intval;
 431                         break;
 432                 case Opt_caps_wanted_delay_max:
 433                         args->caps_wanted_delay_max = intval;
 434                         break;
 435                 case Opt_readdir_max_entries:
 436                         args->max_readdir = intval;
 437                         break;
 438
 439                 case Opt_noshare:
 440                         args->flags |= CEPH_OPT_NOSHARE;
 441                         break;
 442
 443                 case Opt_dirstat:
 444                         args->flags |= CEPH_OPT_DIRSTAT;
 445                         break;
 446                 case Opt_nodirstat:
 447                         args->flags &= ~CEPH_OPT_DIRSTAT;
 448                         break;
 449                 case Opt_rbytes:
 450                         args->flags |= CEPH_OPT_RBYTES;
 451                         break;
 452                 case Opt_norbytes:
 453                         args->flags &= ~CEPH_OPT_RBYTES;
 454                         break;
 455                 case Opt_nocrc:
 456                         args->flags |= CEPH_OPT_NOCRC;
 457                         break;
 458                 case Opt_noasyncreaddir:
 459                         args->flags |= CEPH_OPT_NOASYNCREADDIR;
 460                         break;
 461
 462                 default:
 463                         BUG_ON(token);
 464                 }
 465         }
 466         return args;
 467
 468 out:
 469         kfree(args->mon_addr);
 470         kfree(args);
 471         return ERR_PTR(err);
 472 }
 473
 474 static void destroy_mount_args(struct ceph_mount_args *args)
 475 {
 476         dout("destroy_mount_args %p\n", args);
 477         kfree(args->snapdir_name);
 478         args->snapdir_name = NULL;
 479         kfree(args->secret);
 480         args->secret = NULL;
 481         kfree(args);
 482 }
 483
 484 /*
 485  * create a fresh client instance
 486  */
 487 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
 488 {
 489         struct ceph_client *client;
 490         int err = -ENOMEM;
 491
 492         client = kzalloc(sizeof(*client), GFP_KERNEL);
 493         if (client == NULL)
 494                 return ERR_PTR(-ENOMEM);
 495
 496         mutex_init(&client->mount_mutex);
 497
 498         init_waitqueue_head(&client->mount_wq);
 499
 500         client->sb = NULL;
 501         client->mount_state = CEPH_MOUNT_MOUNTING;
 502         client->whoami = -1;
 503         client->mount_args = args;
 504
 505         client->msgr = NULL;
 506
 507         client->mount_err = 0;
 508         client->signed_ticket = NULL;
 509         client->signed_ticket_len = 0;
 510
 511         err = bdi_init(&client->backing_dev_info);
 512         if (err < 0)
 513                 goto fail;
 514
 515         err = -ENOMEM;
 516         client->wb_wq = create_workqueue("ceph-writeback");
 517         if (client->wb_wq == NULL)
 518                 goto fail_bdi;
 519         client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
 520         if (client->pg_inv_wq == NULL)
 521                 goto fail_wb_wq;
 522         client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
 523         if (client->trunc_wq == NULL)
 524                 goto fail_pg_inv_wq;
 525
 526         /* subsystems */
 527         err = ceph_monc_init(&client->monc, client);
 528         if (err < 0)
 529                 goto fail_trunc_wq;
 530         err = ceph_osdc_init(&client->osdc, client);
 531         if (err < 0)
 532                 goto fail_monc;
 533         ceph_mdsc_init(&client->mdsc, client);
 534         return client;
 535
 536 fail_monc:
 537         ceph_monc_stop(&client->monc);
 538 fail_trunc_wq:
 539         destroy_workqueue(client->trunc_wq);
 540 fail_pg_inv_wq:
 541         destroy_workqueue(client->pg_inv_wq);
 542 fail_wb_wq:
 543         destroy_workqueue(client->wb_wq);
 544 fail_bdi:
 545         bdi_destroy(&client->backing_dev_info);
 546 fail:
 547         kfree(client);
 548         return ERR_PTR(err);
 549 }
 550
 551 static void ceph_destroy_client(struct ceph_client *client)
 552 {
 553         dout("destroy_client %p\n", client);
 554
 555         /* unmount */
 556         ceph_mdsc_stop(&client->mdsc);
 557         ceph_monc_stop(&client->monc);
 558         ceph_osdc_stop(&client->osdc);
 559
 560         kfree(client->signed_ticket);
 561
 562         ceph_debugfs_client_cleanup(client);
 563         destroy_workqueue(client->wb_wq);
 564         destroy_workqueue(client->pg_inv_wq);
 565         destroy_workqueue(client->trunc_wq);
 566
 567         if (client->msgr)
 568                 ceph_messenger_destroy(client->msgr);
 569         if (client->wb_pagevec_pool)
 570                 mempool_destroy(client->wb_pagevec_pool);
 571
 572         destroy_mount_args(client->mount_args);
 573
 574         kfree(client);
 575         dout("destroy_client %p done\n", client);
 576 }
 577
 578 /*
 579  * true if we have the mon map (and have thus joined the cluster)
 580  */
 581 static int have_mon_map(struct ceph_client *client)
 582 {
 583         return client->monc.monmap && client->monc.monmap->epoch;
 584 }
 585
 586 /*
 587  * Bootstrap mount by opening the root directory.  Note the mount
 588  * @started time from caller, and time out if this takes too long.
 589  */
 590 static struct dentry *open_root_dentry(struct ceph_client *client,
 591                                        const char *path,
 592                                        unsigned long started)
 593 {
 594         struct ceph_mds_client *mdsc = &client->mdsc;
 595         struct ceph_mds_request *req = NULL;
 596         int err;
 597         struct dentry *root;
 598
 599         /* open dir */
 600         dout("open_root_inode opening '%s'\n", path);
 601         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 602         if (IS_ERR(req))
 603                 return ERR_PTR(PTR_ERR(req));
 604         req->r_path1 = kstrdup(path, GFP_NOFS);
 605         req->r_ino1.ino = CEPH_INO_ROOT;
 606         req->r_ino1.snap = CEPH_NOSNAP;
 607         req->r_started = started;
 608         req->r_timeout = client->mount_args->mount_timeout * HZ;
 609         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 610         req->r_num_caps = 2;
 611         err = ceph_mdsc_do_request(mdsc, NULL, req);
 612         if (err == 0) {
 613                 dout("open_root_inode success\n");
 614                 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
 615                     client->sb->s_root == NULL)
 616                         root = d_alloc_root(req->r_target_inode);
 617                 else
 618                         root = d_obtain_alias(req->r_target_inode);
 619                 req->r_target_inode = NULL;
 620                 dout("open_root_inode success, root dentry is %p\n", root);
 621         } else {
 622                 root = ERR_PTR(err);
 623         }
 624         ceph_mdsc_put_request(req);
 625         return root;
 626 }
 627
 628 /*
 629  * mount: join the ceph cluster, and open root directory.
 630  */
 631 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
 632                       const char *path)
 633 {
 634         struct ceph_entity_addr *myaddr = NULL;
 635         int err;
 636         unsigned long timeout = client->mount_args->mount_timeout * HZ;
 637         unsigned long started = jiffies;  /* note the start time */
 638         struct dentry *root;
 639
 640         dout("mount start\n");
 641         mutex_lock(&client->mount_mutex);
 642
 643         /* initialize the messenger */
 644         if (client->msgr == NULL) {
 645                 if (ceph_test_opt(client, MYIP))
 646                         myaddr = &client->mount_args->my_addr;
 647                 client->msgr = ceph_messenger_create(myaddr);
 648                 if (IS_ERR(client->msgr)) {
 649                         err = PTR_ERR(client->msgr);
 650                         client->msgr = NULL;
 651                         goto out;
 652                 }
 653                 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
 654         }
 655
 656         /* send mount request, and wait for mon, mds, and osd maps */
 657         err = ceph_monc_request_mount(&client->monc);
 658         if (err < 0)
 659                 goto out;
 660
 661         while (!have_mon_map(client) && !client->mount_err) {
 662                 err = -EIO;
 663                 if (timeout && time_after_eq(jiffies, started + timeout))
 664                         goto out;
 665
 666                 /* wait */
 667                 dout("mount waiting for mount\n");
 668                 err = wait_event_interruptible_timeout(client->mount_wq,
 669                                client->mount_err || have_mon_map(client),
 670                                timeout);
 671                 if (err == -EINTR || err == -ERESTARTSYS)
 672                         goto out;
 673                 if (client->mount_err) {
 674                         err = client->mount_err;
 675                         goto out;
 676                 }
 677         }
 678
 679         dout("mount opening root\n");
 680         root = open_root_dentry(client, "", started);
 681         if (IS_ERR(root)) {
 682                 err = PTR_ERR(root);
 683                 goto out;
 684         }
 685         if (client->sb->s_root)
 686                 dput(root);
 687         else
 688                 client->sb->s_root = root;
 689
 690         if (path[0] == 0) {
 691                 dget(root);
 692         } else {
 693                 dout("mount opening base mountpoint\n");
 694                 root = open_root_dentry(client, path, started);
 695                 if (IS_ERR(root)) {
 696                         err = PTR_ERR(root);
 697                         dput(client->sb->s_root);
 698                         client->sb->s_root = NULL;
 699                         goto out;
 700                 }
 701         }
 702
 703         mnt->mnt_root = root;
 704         mnt->mnt_sb = client->sb;
 705
 706         client->mount_state = CEPH_MOUNT_MOUNTED;
 707         dout("mount success\n");
 708         err = 0;
 709
 710 out:
 711         mutex_unlock(&client->mount_mutex);
 712         return err;
 713 }
 714
 715 static int ceph_set_super(struct super_block *s, void *data)
 716 {
 717         struct ceph_client *client = data;
 718         int ret;
 719
 720         dout("set_super %p data %p\n", s, data);
 721
 722         s->s_flags = client->mount_args->sb_flags;
 723         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 724
 725         s->s_fs_info = client;
 726         client->sb = s;
 727
 728         s->s_op = &ceph_super_ops;
 729         s->s_export_op = &ceph_export_ops;
 730
 731         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 732
 733         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 734         if (ret != 0)
 735                 goto fail;
 736
 737         return ret;
 738
 739 fail:
 740         s->s_fs_info = NULL;
 741         client->sb = NULL;
 742         return ret;
 743 }
 744
 745 /*
 746  * share superblock if same fs AND options
 747  */
 748 static int ceph_compare_super(struct super_block *sb, void *data)
 749 {
 750         struct ceph_client *new = data;
 751         struct ceph_mount_args *args = new->mount_args;
 752         struct ceph_client *other = ceph_sb_to_client(sb);
 753         int i;
 754
 755         dout("ceph_compare_super %p\n", sb);
 756         if (args->flags & CEPH_OPT_FSID) {
 757                 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
 758                         dout("fsid doesn't match\n");
 759                         return 0;
 760                 }
 761         } else {
 762                 /* do we share (a) monitor? */
 763                 for (i = 0; i < new->monc.monmap->num_mon; i++)
 764                         if (ceph_monmap_contains(other->monc.monmap,
 765                                          &new->monc.monmap->mon_inst[i].addr))
 766                                 break;
 767                 if (i == new->monc.monmap->num_mon) {
 768                         dout("mon ip not part of monmap\n");
 769                         return 0;
 770                 }
 771                 dout("mon ip matches existing sb %p\n", sb);
 772         }
 773         if (args->sb_flags != other->mount_args->sb_flags) {
 774                 dout("flags differ\n");
 775                 return 0;
 776         }
 777         return 1;
 778 }
 779
 780 /*
 781  * construct our own bdi so we can control readahead, etc.
 782  */
 783 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
 784 {
 785         int err;
 786
 787         sb->s_bdi = &client->backing_dev_info;
 788
 789         /* set ra_pages based on rsize mount option? */
 790         if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
 791                 client->backing_dev_info.ra_pages =
 792                         (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
 793                         >> PAGE_SHIFT;
 794
 795         err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
 796         return err;
 797 }
 798
 799 static int ceph_get_sb(struct file_system_type *fs_type,
 800                        int flags, const char *dev_name, void *data,
 801                        struct vfsmount *mnt)
 802 {
 803         struct super_block *sb;
 804         struct ceph_client *client;
 805         int err;
 806         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 807         const char *path = 0;
 808         struct ceph_mount_args *args;
 809
 810         dout("ceph_get_sb\n");
 811         args = parse_mount_args(flags, data, dev_name, &path);
 812         if (IS_ERR(args)) {
 813                 err = PTR_ERR(args);
 814                 goto out_final;
 815         }
 816
 817         /* create client (which we may/may not use) */
 818         client = ceph_create_client(args);
 819         if (IS_ERR(client)) {
 820                 err = PTR_ERR(client);
 821                 goto out_final;
 822         }
 823
 824         if (client->mount_args->flags & CEPH_OPT_NOSHARE)
 825                 compare_super = NULL;
 826         sb = sget(fs_type, compare_super, ceph_set_super, client);
 827         if (IS_ERR(sb)) {
 828                 err = PTR_ERR(sb);
 829                 goto out;
 830         }
 831
 832         if (ceph_client(sb) != client) {
 833                 ceph_destroy_client(client);
 834                 client = ceph_client(sb);
 835                 dout("get_sb got existing client %p\n", client);
 836         } else {
 837                 dout("get_sb using new client %p\n", client);
 838
 839                 /* set up mempools */
 840                 err = -ENOMEM;
 841                 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
 842                               client->mount_args->wsize >> PAGE_CACHE_SHIFT);
 843                 if (!client->wb_pagevec_pool)
 844                         goto out_splat;
 845
 846                 err = ceph_register_bdi(sb, client);
 847                 if (err < 0)
 848                         goto out_splat;
 849         }
 850
 851         err = ceph_mount(client, mnt, path);
 852         if (err < 0)
 853                 goto out_splat;
 854         dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
 855              mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
 856         return 0;
 857
 858 out_splat:
 859         ceph_mdsc_close_sessions(&client->mdsc);
 860         up_write(&sb->s_umount);
 861         deactivate_super(sb);
 862         goto out_final;
 863
 864 out:
 865         ceph_destroy_client(client);
 866 out_final:
 867         dout("ceph_get_sb fail %d\n", err);
 868         return err;
 869 }
 870
 871 static void ceph_kill_sb(struct super_block *s)
 872 {
 873         struct ceph_client *client = ceph_sb_to_client(s);
 874         dout("kill_sb %p\n", s);
 875         ceph_mdsc_pre_umount(&client->mdsc);
 876         kill_anon_super(s);    /* will call put_super after sb is r/o */
 877         bdi_unregister(&client->backing_dev_info);
 878         bdi_destroy(&client->backing_dev_info);
 879         ceph_destroy_client(client);
 880 }
 881
 882 static struct file_system_type ceph_fs_type = {
 883         .owner          = THIS_MODULE,
 884         .name           = "ceph",
 885         .get_sb         = ceph_get_sb,
 886         .kill_sb        = ceph_kill_sb,
 887         .fs_flags       = FS_RENAME_DOES_D_MOVE,
 888 };
 889
 890 #define _STRINGIFY(x) #x
 891 #define STRINGIFY(x) _STRINGIFY(x)
 892
 893 static int __init init_ceph(void)
 894 {
 895         int ret = 0;
 896
 897         ret = ceph_debugfs_init();
 898         if (ret < 0)
 899                 goto out;
 900
 901         ret = ceph_msgr_init();
 902         if (ret < 0)
 903                 goto out_debugfs;
 904
 905         ret = init_caches();
 906         if (ret)
 907                 goto out_msgr;
 908
 909         ceph_caps_init();
 910
 911         ret = register_filesystem(&ceph_fs_type);
 912         if (ret)
 913                 goto out_icache;
 914
 915         pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n",
 916                 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH,
 917                 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL);
 918         return 0;
 919
 920 out_icache:
 921         destroy_caches();
 922 out_msgr:
 923         ceph_msgr_exit();
 924 out_debugfs:
 925         ceph_debugfs_cleanup();
 926 out:
 927         return ret;
 928 }
 929
 930 static void __exit exit_ceph(void)
 931 {
 932         dout("exit_ceph\n");
 933         unregister_filesystem(&ceph_fs_type);
 934         ceph_caps_finalize();
 935         destroy_caches();
 936         ceph_msgr_exit();
 937         ceph_debugfs_cleanup();
 938 }
 939
 940 module_init(init_ceph);
 941 module_exit(exit_ceph);
 942
 943 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
 944 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
 945 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
 946 MODULE_DESCRIPTION("Ceph filesystem for Linux");
 947 MODULE_LICENSE("GPL");