fs/ceph/super.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/backing-dev.h>
   5 #include <linux/ctype.h>
   6 #include <linux/fs.h>
   7 #include <linux/inet.h>
   8 #include <linux/in6.h>
   9 #include <linux/module.h>
  10 #include <linux/mount.h>
  11 #include <linux/parser.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
  18 #include "super.h"
  19 #include "mds_client.h"
  20 #include "cache.h"
  21
  22 #include <linux/ceph/ceph_features.h>
  23 #include <linux/ceph/decode.h>
  24 #include <linux/ceph/mon_client.h>
  25 #include <linux/ceph/auth.h>
  26 #include <linux/ceph/debugfs.h>
  27
  28 /*
  29  * Ceph superblock operations
  30  *
  31  * Handle the basics of mounting, unmounting.
  32  */
  33
  34 /*
  35  * super ops
  36  */
  37 static void ceph_put_super(struct super_block *s)
  38 {
  39         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  40
  41         dout("put_super\n");
  42         ceph_mdsc_close_sessions(fsc->mdsc);
  43 }
  44
  45 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  46 {
  47         struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
  48         struct ceph_monmap *monmap = fsc->client->monc.monmap;
  49         struct ceph_statfs st;
  50         u64 fsid;
  51         int err;
  52
  53         dout("statfs\n");
  54         err = ceph_monc_do_statfs(&fsc->client->monc, &st);
  55         if (err < 0)
  56                 return err;
  57
  58         /* fill in kstatfs */
  59         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  60
  61         /*
  62          * express utilization in terms of large blocks to avoid
  63          * overflow on 32-bit machines.
  64          *
  65          * NOTE: for the time being, we make bsize == frsize to humor
  66          * not-yet-ancient versions of glibc that are broken.
  67          * Someday, we will probably want to report a real block
  68          * size...  whatever that may mean for a network file system!
  69          */
  70         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  71         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  72         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  73         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  74         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  75
  76         buf->f_files = le64_to_cpu(st.num_objects);
  77         buf->f_ffree = -1;
  78         buf->f_namelen = NAME_MAX;
  79
  80         /* leave fsid little-endian, regardless of host endianness */
  81         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  82         buf->f_fsid.val[0] = fsid & 0xffffffff;
  83         buf->f_fsid.val[1] = fsid >> 32;
  84
  85         return 0;
  86 }
  87
  88
  89 static int ceph_sync_fs(struct super_block *sb, int wait)
  90 {
  91         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
  92
  93         if (!wait) {
  94                 dout("sync_fs (non-blocking)\n");
  95                 ceph_flush_dirty_caps(fsc->mdsc);
  96                 dout("sync_fs (non-blocking) done\n");
  97                 return 0;
  98         }
  99
 100         dout("sync_fs (blocking)\n");
 101         ceph_osdc_sync(&fsc->client->osdc);
 102         ceph_mdsc_sync(fsc->mdsc);
 103         dout("sync_fs (blocking) done\n");
 104         return 0;
 105 }
 106
 107 /*
 108  * mount options
 109  */
 110 enum {
 111         Opt_wsize,
 112         Opt_rsize,
 113         Opt_rasize,
 114         Opt_caps_wanted_delay_min,
 115         Opt_caps_wanted_delay_max,
 116         Opt_cap_release_safety,
 117         Opt_readdir_max_entries,
 118         Opt_readdir_max_bytes,
 119         Opt_congestion_kb,
 120         Opt_last_int,
 121         /* int args above */
 122         Opt_snapdirname,
 123         Opt_last_string,
 124         /* string args above */
 125         Opt_dirstat,
 126         Opt_nodirstat,
 127         Opt_rbytes,
 128         Opt_norbytes,
 129         Opt_asyncreaddir,
 130         Opt_noasyncreaddir,
 131         Opt_dcache,
 132         Opt_nodcache,
 133         Opt_ino32,
 134         Opt_noino32,
 135         Opt_fscache,
 136         Opt_nofscache,
 137 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 138         Opt_acl,
 139 #endif
 140         Opt_noacl
 141 };
 142
 143 static match_table_t fsopt_tokens = {
 144         {Opt_wsize, "wsize=%d"},
 145         {Opt_rsize, "rsize=%d"},
 146         {Opt_rasize, "rasize=%d"},
 147         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 148         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 149         {Opt_cap_release_safety, "cap_release_safety=%d"},
 150         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 151         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 152         {Opt_congestion_kb, "write_congestion_kb=%d"},
 153         /* int args above */
 154         {Opt_snapdirname, "snapdirname=%s"},
 155         /* string args above */
 156         {Opt_dirstat, "dirstat"},
 157         {Opt_nodirstat, "nodirstat"},
 158         {Opt_rbytes, "rbytes"},
 159         {Opt_norbytes, "norbytes"},
 160         {Opt_asyncreaddir, "asyncreaddir"},
 161         {Opt_noasyncreaddir, "noasyncreaddir"},
 162         {Opt_dcache, "dcache"},
 163         {Opt_nodcache, "nodcache"},
 164         {Opt_ino32, "ino32"},
 165         {Opt_noino32, "noino32"},
 166         {Opt_fscache, "fsc"},
 167         {Opt_nofscache, "nofsc"},
 168 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 169         {Opt_acl, "acl"},
 170 #endif
 171         {Opt_noacl, "noacl"},
 172         {-1, NULL}
 173 };
 174
 175 static int parse_fsopt_token(char *c, void *private)
 176 {
 177         struct ceph_mount_options *fsopt = private;
 178         substring_t argstr[MAX_OPT_ARGS];
 179         int token, intval, ret;
 180
 181         token = match_token((char *)c, fsopt_tokens, argstr);
 182         if (token < 0)
 183                 return -EINVAL;
 184
 185         if (token < Opt_last_int) {
 186                 ret = match_int(&argstr[0], &intval);
 187                 if (ret < 0) {
 188                         pr_err("bad mount option arg (not int) "
 189                                "at '%s'\n", c);
 190                         return ret;
 191                 }
 192                 dout("got int token %d val %d\n", token, intval);
 193         } else if (token > Opt_last_int && token < Opt_last_string) {
 194                 dout("got string token %d val %s\n", token,
 195                      argstr[0].from);
 196         } else {
 197                 dout("got token %d\n", token);
 198         }
 199
 200         switch (token) {
 201         case Opt_snapdirname:
 202                 kfree(fsopt->snapdir_name);
 203                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 204                                                argstr[0].to-argstr[0].from,
 205                                                GFP_KERNEL);
 206                 if (!fsopt->snapdir_name)
 207                         return -ENOMEM;
 208                 break;
 209
 210                 /* misc */
 211         case Opt_wsize:
 212                 fsopt->wsize = intval;
 213                 break;
 214         case Opt_rsize:
 215                 fsopt->rsize = intval;
 216                 break;
 217         case Opt_rasize:
 218                 fsopt->rasize = intval;
 219                 break;
 220         case Opt_caps_wanted_delay_min:
 221                 fsopt->caps_wanted_delay_min = intval;
 222                 break;
 223         case Opt_caps_wanted_delay_max:
 224                 fsopt->caps_wanted_delay_max = intval;
 225                 break;
 226         case Opt_readdir_max_entries:
 227                 fsopt->max_readdir = intval;
 228                 break;
 229         case Opt_readdir_max_bytes:
 230                 fsopt->max_readdir_bytes = intval;
 231                 break;
 232         case Opt_congestion_kb:
 233                 fsopt->congestion_kb = intval;
 234                 break;
 235         case Opt_dirstat:
 236                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 237                 break;
 238         case Opt_nodirstat:
 239                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 240                 break;
 241         case Opt_rbytes:
 242                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 243                 break;
 244         case Opt_norbytes:
 245                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 246                 break;
 247         case Opt_asyncreaddir:
 248                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 249                 break;
 250         case Opt_noasyncreaddir:
 251                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 252                 break;
 253         case Opt_dcache:
 254                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 255                 break;
 256         case Opt_nodcache:
 257                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 258                 break;
 259         case Opt_ino32:
 260                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 261                 break;
 262         case Opt_noino32:
 263                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 264                 break;
 265         case Opt_fscache:
 266                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 267                 break;
 268         case Opt_nofscache:
 269                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 270                 break;
 271 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 272         case Opt_acl:
 273                 fsopt->sb_flags |= MS_POSIXACL;
 274                 break;
 275 #endif
 276         case Opt_noacl:
 277                 fsopt->sb_flags &= ~MS_POSIXACL;
 278                 break;
 279         default:
 280                 BUG_ON(token);
 281         }
 282         return 0;
 283 }
 284
 285 static void destroy_mount_options(struct ceph_mount_options *args)
 286 {
 287         dout("destroy_mount_options %p\n", args);
 288         kfree(args->snapdir_name);
 289         kfree(args);
 290 }
 291
 292 static int strcmp_null(const char *s1, const char *s2)
 293 {
 294         if (!s1 && !s2)
 295                 return 0;
 296         if (s1 && !s2)
 297                 return -1;
 298         if (!s1 && s2)
 299                 return 1;
 300         return strcmp(s1, s2);
 301 }
 302
 303 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 304                                  struct ceph_options *new_opt,
 305                                  struct ceph_fs_client *fsc)
 306 {
 307         struct ceph_mount_options *fsopt1 = new_fsopt;
 308         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 309         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 310         int ret;
 311
 312         ret = memcmp(fsopt1, fsopt2, ofs);
 313         if (ret)
 314                 return ret;
 315
 316         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 317         if (ret)
 318                 return ret;
 319
 320         return ceph_compare_options(new_opt, fsc->client);
 321 }
 322
 323 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 324                                struct ceph_options **popt,
 325                                int flags, char *options,
 326                                const char *dev_name,
 327                                const char **path)
 328 {
 329         struct ceph_mount_options *fsopt;
 330         const char *dev_name_end;
 331         int err;
 332
 333         if (!dev_name || !*dev_name)
 334                 return -EINVAL;
 335
 336         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 337         if (!fsopt)
 338                 return -ENOMEM;
 339
 340         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 341
 342         fsopt->sb_flags = flags;
 343         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 344
 345         fsopt->rsize = CEPH_RSIZE_DEFAULT;
 346         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 347         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 348         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 349         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 350         fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
 351         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 352         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 353         fsopt->congestion_kb = default_congestion_kb();
 354
 355         /*
 356          * Distinguish the server list from the path in "dev_name".
 357          * Internally we do not include the leading '/' in the path.
 358          *
 359          * "dev_name" will look like:
 360          *     <server_spec>[,<server_spec>...]:[<path>]
 361          * where
 362          *     <server_spec> is <ip>[:<port>]
 363          *     <path> is optional, but if present must begin with '/'
 364          */
 365         dev_name_end = strchr(dev_name, '/');
 366         if (dev_name_end) {
 367                 /* skip over leading '/' for path */
 368                 *path = dev_name_end + 1;
 369         } else {
 370                 /* path is empty */
 371                 dev_name_end = dev_name + strlen(dev_name);
 372                 *path = dev_name_end;
 373         }
 374         err = -EINVAL;
 375         dev_name_end--;         /* back up to ':' separator */
 376         if (dev_name_end < dev_name || *dev_name_end != ':') {
 377                 pr_err("device name is missing path (no : separator in %s)\n",
 378                                 dev_name);
 379                 goto out;
 380         }
 381         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 382         dout("server path '%s'\n", *path);
 383
 384         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 385                                  parse_fsopt_token, (void *)fsopt);
 386         if (IS_ERR(*popt)) {
 387                 err = PTR_ERR(*popt);
 388                 goto out;
 389         }
 390
 391         /* success */
 392         *pfsopt = fsopt;
 393         return 0;
 394
 395 out:
 396         destroy_mount_options(fsopt);
 397         return err;
 398 }
 399
 400 /**
 401  * ceph_show_options - Show mount options in /proc/mounts
 402  * @m: seq_file to write to
 403  * @root: root of that (sub)tree
 404  */
 405 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 406 {
 407         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 408         struct ceph_mount_options *fsopt = fsc->mount_options;
 409         struct ceph_options *opt = fsc->client->options;
 410
 411         if (opt->flags & CEPH_OPT_FSID)
 412                 seq_printf(m, ",fsid=%pU", &opt->fsid);
 413         if (opt->flags & CEPH_OPT_NOSHARE)
 414                 seq_puts(m, ",noshare");
 415         if (opt->flags & CEPH_OPT_NOCRC)
 416                 seq_puts(m, ",nocrc");
 417         if (opt->flags & CEPH_OPT_NOMSGAUTH)
 418                 seq_puts(m, ",nocephx_require_signatures");
 419         if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
 420                 seq_puts(m, ",notcp_nodelay");
 421
 422         if (opt->name)
 423                 seq_printf(m, ",name=%s", opt->name);
 424         if (opt->key)
 425                 seq_puts(m, ",secret=<hidden>");
 426
 427         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
 428                 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
 429         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
 430                 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
 431         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
 432                 seq_printf(m, ",osdkeepalivetimeout=%d",
 433                            opt->osd_keepalive_timeout);
 434
 435         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 436                 seq_puts(m, ",dirstat");
 437         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
 438                 seq_puts(m, ",norbytes");
 439         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 440                 seq_puts(m, ",noasyncreaddir");
 441         if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
 442                 seq_puts(m, ",dcache");
 443         else
 444                 seq_puts(m, ",nodcache");
 445         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
 446                 seq_puts(m, ",fsc");
 447         else
 448                 seq_puts(m, ",nofsc");
 449
 450 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 451         if (fsopt->sb_flags & MS_POSIXACL)
 452                 seq_puts(m, ",acl");
 453         else
 454                 seq_puts(m, ",noacl");
 455 #endif
 456
 457         if (fsopt->wsize)
 458                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 459         if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
 460                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 461         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 462                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 463         if (fsopt->congestion_kb != default_congestion_kb())
 464                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 465         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 466                 seq_printf(m, ",caps_wanted_delay_min=%d",
 467                          fsopt->caps_wanted_delay_min);
 468         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 469                 seq_printf(m, ",caps_wanted_delay_max=%d",
 470                            fsopt->caps_wanted_delay_max);
 471         if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 472                 seq_printf(m, ",cap_release_safety=%d",
 473                            fsopt->cap_release_safety);
 474         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 475                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 476         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 477                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 478         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 479                 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
 480         return 0;
 481 }
 482
 483 /*
 484  * handle any mon messages the standard library doesn't understand.
 485  * return error if we don't either.
 486  */
 487 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 488 {
 489         struct ceph_fs_client *fsc = client->private;
 490         int type = le16_to_cpu(msg->hdr.type);
 491
 492         switch (type) {
 493         case CEPH_MSG_MDS_MAP:
 494                 ceph_mdsc_handle_map(fsc->mdsc, msg);
 495                 return 0;
 496
 497         default:
 498                 return -1;
 499         }
 500 }
 501
 502 /*
 503  * create a new fs client
 504  */
 505 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 506                                         struct ceph_options *opt)
 507 {
 508         struct ceph_fs_client *fsc;
 509         const u64 supported_features =
 510                 CEPH_FEATURE_FLOCK |
 511                 CEPH_FEATURE_DIRLAYOUTHASH |
 512                 CEPH_FEATURE_MDS_INLINE_DATA;
 513         const u64 required_features = 0;
 514         int page_count;
 515         size_t size;
 516         int err = -ENOMEM;
 517
 518         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 519         if (!fsc)
 520                 return ERR_PTR(-ENOMEM);
 521
 522         fsc->client = ceph_create_client(opt, fsc, supported_features,
 523                                          required_features);
 524         if (IS_ERR(fsc->client)) {
 525                 err = PTR_ERR(fsc->client);
 526                 goto fail;
 527         }
 528         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 529         fsc->client->monc.want_mdsmap = 1;
 530
 531         fsc->mount_options = fsopt;
 532
 533         fsc->sb = NULL;
 534         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 535
 536         atomic_long_set(&fsc->writeback_count, 0);
 537
 538         err = bdi_init(&fsc->backing_dev_info);
 539         if (err < 0)
 540                 goto fail_client;
 541
 542         err = -ENOMEM;
 543         /*
 544          * The number of concurrent works can be high but they don't need
 545          * to be processed in parallel, limit concurrency.
 546          */
 547         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 548         if (fsc->wb_wq == NULL)
 549                 goto fail_bdi;
 550         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 551         if (fsc->pg_inv_wq == NULL)
 552                 goto fail_wb_wq;
 553         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 554         if (fsc->trunc_wq == NULL)
 555                 goto fail_pg_inv_wq;
 556
 557         /* set up mempools */
 558         err = -ENOMEM;
 559         page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
 560         size = sizeof (struct page *) * (page_count ? page_count : 1);
 561         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 562         if (!fsc->wb_pagevec_pool)
 563                 goto fail_trunc_wq;
 564
 565         /* setup fscache */
 566         if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
 567             (ceph_fscache_register_fs(fsc) != 0))
 568                 goto fail_fscache;
 569
 570         /* caps */
 571         fsc->min_caps = fsopt->max_readdir;
 572
 573         return fsc;
 574
 575 fail_fscache:
 576         ceph_fscache_unregister_fs(fsc);
 577 fail_trunc_wq:
 578         destroy_workqueue(fsc->trunc_wq);
 579 fail_pg_inv_wq:
 580         destroy_workqueue(fsc->pg_inv_wq);
 581 fail_wb_wq:
 582         destroy_workqueue(fsc->wb_wq);
 583 fail_bdi:
 584         bdi_destroy(&fsc->backing_dev_info);
 585 fail_client:
 586         ceph_destroy_client(fsc->client);
 587 fail:
 588         kfree(fsc);
 589         return ERR_PTR(err);
 590 }
 591
 592 static void destroy_fs_client(struct ceph_fs_client *fsc)
 593 {
 594         dout("destroy_fs_client %p\n", fsc);
 595
 596         ceph_fscache_unregister_fs(fsc);
 597
 598         destroy_workqueue(fsc->wb_wq);
 599         destroy_workqueue(fsc->pg_inv_wq);
 600         destroy_workqueue(fsc->trunc_wq);
 601
 602         bdi_destroy(&fsc->backing_dev_info);
 603
 604         mempool_destroy(fsc->wb_pagevec_pool);
 605
 606         destroy_mount_options(fsc->mount_options);
 607
 608         ceph_fs_debugfs_cleanup(fsc);
 609
 610         ceph_destroy_client(fsc->client);
 611
 612         kfree(fsc);
 613         dout("destroy_fs_client %p done\n", fsc);
 614 }
 615
 616 /*
 617  * caches
 618  */
 619 struct kmem_cache *ceph_inode_cachep;
 620 struct kmem_cache *ceph_cap_cachep;
 621 struct kmem_cache *ceph_dentry_cachep;
 622 struct kmem_cache *ceph_file_cachep;
 623
 624 static void ceph_inode_init_once(void *foo)
 625 {
 626         struct ceph_inode_info *ci = foo;
 627         inode_init_once(&ci->vfs_inode);
 628 }
 629
 630 static int __init init_caches(void)
 631 {
 632         int error = -ENOMEM;
 633
 634         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 635                                       sizeof(struct ceph_inode_info),
 636                                       __alignof__(struct ceph_inode_info),
 637                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 638                                       ceph_inode_init_once);
 639         if (ceph_inode_cachep == NULL)
 640                 return -ENOMEM;
 641
 642         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 643                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 644         if (ceph_cap_cachep == NULL)
 645                 goto bad_cap;
 646
 647         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 648                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 649         if (ceph_dentry_cachep == NULL)
 650                 goto bad_dentry;
 651
 652         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 653                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 654         if (ceph_file_cachep == NULL)
 655                 goto bad_file;
 656
 657         if ((error = ceph_fscache_register()))
 658                 goto bad_file;
 659
 660         return 0;
 661 bad_file:
 662         kmem_cache_destroy(ceph_dentry_cachep);
 663 bad_dentry:
 664         kmem_cache_destroy(ceph_cap_cachep);
 665 bad_cap:
 666         kmem_cache_destroy(ceph_inode_cachep);
 667         return error;
 668 }
 669
 670 static void destroy_caches(void)
 671 {
 672         /*
 673          * Make sure all delayed rcu free inodes are flushed before we
 674          * destroy cache.
 675          */
 676         rcu_barrier();
 677
 678         kmem_cache_destroy(ceph_inode_cachep);
 679         kmem_cache_destroy(ceph_cap_cachep);
 680         kmem_cache_destroy(ceph_dentry_cachep);
 681         kmem_cache_destroy(ceph_file_cachep);
 682
 683         ceph_fscache_unregister();
 684 }
 685
 686
 687 /*
 688  * ceph_umount_begin - initiate forced umount.  Tear down down the
 689  * mount, skipping steps that may hang while waiting for server(s).
 690  */
 691 static void ceph_umount_begin(struct super_block *sb)
 692 {
 693         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 694
 695         dout("ceph_umount_begin - starting forced umount\n");
 696         if (!fsc)
 697                 return;
 698         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 699         return;
 700 }
 701
 702 static const struct super_operations ceph_super_ops = {
 703         .alloc_inode    = ceph_alloc_inode,
 704         .destroy_inode  = ceph_destroy_inode,
 705         .write_inode    = ceph_write_inode,
 706         .drop_inode     = ceph_drop_inode,
 707         .sync_fs        = ceph_sync_fs,
 708         .put_super      = ceph_put_super,
 709         .show_options   = ceph_show_options,
 710         .statfs         = ceph_statfs,
 711         .umount_begin   = ceph_umount_begin,
 712 };
 713
 714 /*
 715  * Bootstrap mount by opening the root directory.  Note the mount
 716  * @started time from caller, and time out if this takes too long.
 717  */
 718 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 719                                        const char *path,
 720                                        unsigned long started)
 721 {
 722         struct ceph_mds_client *mdsc = fsc->mdsc;
 723         struct ceph_mds_request *req = NULL;
 724         int err;
 725         struct dentry *root;
 726
 727         /* open dir */
 728         dout("open_root_inode opening '%s'\n", path);
 729         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 730         if (IS_ERR(req))
 731                 return ERR_CAST(req);
 732         req->r_path1 = kstrdup(path, GFP_NOFS);
 733         req->r_ino1.ino = CEPH_INO_ROOT;
 734         req->r_ino1.snap = CEPH_NOSNAP;
 735         req->r_started = started;
 736         req->r_timeout = fsc->client->options->mount_timeout * HZ;
 737         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 738         req->r_num_caps = 2;
 739         err = ceph_mdsc_do_request(mdsc, NULL, req);
 740         if (err == 0) {
 741                 struct inode *inode = req->r_target_inode;
 742                 req->r_target_inode = NULL;
 743                 dout("open_root_inode success\n");
 744                 if (ceph_ino(inode) == CEPH_INO_ROOT &&
 745                     fsc->sb->s_root == NULL) {
 746                         root = d_make_root(inode);
 747                         if (!root) {
 748                                 root = ERR_PTR(-ENOMEM);
 749                                 goto out;
 750                         }
 751                 } else {
 752                         root = d_obtain_root(inode);
 753                 }
 754                 ceph_init_dentry(root);
 755                 dout("open_root_inode success, root dentry is %p\n", root);
 756         } else {
 757                 root = ERR_PTR(err);
 758         }
 759 out:
 760         ceph_mdsc_put_request(req);
 761         return root;
 762 }
 763
 764
 765
 766
 767 /*
 768  * mount: join the ceph cluster, and open root directory.
 769  */
 770 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 771                       const char *path)
 772 {
 773         int err;
 774         unsigned long started = jiffies;  /* note the start time */
 775         struct dentry *root;
 776         int first = 0;   /* first vfsmount for this super_block */
 777
 778         dout("mount start\n");
 779         mutex_lock(&fsc->client->mount_mutex);
 780
 781         err = __ceph_open_session(fsc->client, started);
 782         if (err < 0)
 783                 goto out;
 784
 785         dout("mount opening root\n");
 786         root = open_root_dentry(fsc, "", started);
 787         if (IS_ERR(root)) {
 788                 err = PTR_ERR(root);
 789                 goto out;
 790         }
 791         if (fsc->sb->s_root) {
 792                 dput(root);
 793         } else {
 794                 fsc->sb->s_root = root;
 795                 first = 1;
 796
 797                 err = ceph_fs_debugfs_init(fsc);
 798                 if (err < 0)
 799                         goto fail;
 800         }
 801
 802         if (path[0] == 0) {
 803                 dget(root);
 804         } else {
 805                 dout("mount opening base mountpoint\n");
 806                 root = open_root_dentry(fsc, path, started);
 807                 if (IS_ERR(root)) {
 808                         err = PTR_ERR(root);
 809                         goto fail;
 810                 }
 811         }
 812
 813         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 814         dout("mount success\n");
 815         mutex_unlock(&fsc->client->mount_mutex);
 816         return root;
 817
 818 out:
 819         mutex_unlock(&fsc->client->mount_mutex);
 820         return ERR_PTR(err);
 821
 822 fail:
 823         if (first) {
 824                 dput(fsc->sb->s_root);
 825                 fsc->sb->s_root = NULL;
 826         }
 827         goto out;
 828 }
 829
 830 static int ceph_set_super(struct super_block *s, void *data)
 831 {
 832         struct ceph_fs_client *fsc = data;
 833         int ret;
 834
 835         dout("set_super %p data %p\n", s, data);
 836
 837         s->s_flags = fsc->mount_options->sb_flags;
 838         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 839
 840         s->s_xattr = ceph_xattr_handlers;
 841         s->s_fs_info = fsc;
 842         fsc->sb = s;
 843
 844         s->s_op = &ceph_super_ops;
 845         s->s_export_op = &ceph_export_ops;
 846
 847         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 848
 849         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 850         if (ret != 0)
 851                 goto fail;
 852
 853         return ret;
 854
 855 fail:
 856         s->s_fs_info = NULL;
 857         fsc->sb = NULL;
 858         return ret;
 859 }
 860
 861 /*
 862  * share superblock if same fs AND options
 863  */
 864 static int ceph_compare_super(struct super_block *sb, void *data)
 865 {
 866         struct ceph_fs_client *new = data;
 867         struct ceph_mount_options *fsopt = new->mount_options;
 868         struct ceph_options *opt = new->client->options;
 869         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 870
 871         dout("ceph_compare_super %p\n", sb);
 872
 873         if (compare_mount_options(fsopt, opt, other)) {
 874                 dout("monitor(s)/mount options don't match\n");
 875                 return 0;
 876         }
 877         if ((opt->flags & CEPH_OPT_FSID) &&
 878             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 879                 dout("fsid doesn't match\n");
 880                 return 0;
 881         }
 882         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 883                 dout("flags differ\n");
 884                 return 0;
 885         }
 886         return 1;
 887 }
 888
 889 /*
 890  * construct our own bdi so we can control readahead, etc.
 891  */
 892 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 893
 894 static int ceph_register_bdi(struct super_block *sb,
 895                              struct ceph_fs_client *fsc)
 896 {
 897         int err;
 898
 899         /* set ra_pages based on rasize mount option? */
 900         if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
 901                 fsc->backing_dev_info.ra_pages =
 902                         (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
 903                         >> PAGE_SHIFT;
 904         else
 905                 fsc->backing_dev_info.ra_pages =
 906                         VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE;
 907
 908         err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
 909                            atomic_long_inc_return(&bdi_seq));
 910         if (!err)
 911                 sb->s_bdi = &fsc->backing_dev_info;
 912         return err;
 913 }
 914
 915 static struct dentry *ceph_mount(struct file_system_type *fs_type,
 916                        int flags, const char *dev_name, void *data)
 917 {
 918         struct super_block *sb;
 919         struct ceph_fs_client *fsc;
 920         struct dentry *res;
 921         int err;
 922         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 923         const char *path = NULL;
 924         struct ceph_mount_options *fsopt = NULL;
 925         struct ceph_options *opt = NULL;
 926
 927         dout("ceph_mount\n");
 928
 929 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 930         flags |= MS_POSIXACL;
 931 #endif
 932         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
 933         if (err < 0) {
 934                 res = ERR_PTR(err);
 935                 goto out_final;
 936         }
 937
 938         /* create client (which we may/may not use) */
 939         fsc = create_fs_client(fsopt, opt);
 940         if (IS_ERR(fsc)) {
 941                 res = ERR_CAST(fsc);
 942                 destroy_mount_options(fsopt);
 943                 ceph_destroy_options(opt);
 944                 goto out_final;
 945         }
 946
 947         err = ceph_mdsc_init(fsc);
 948         if (err < 0) {
 949                 res = ERR_PTR(err);
 950                 goto out;
 951         }
 952
 953         if (ceph_test_opt(fsc->client, NOSHARE))
 954                 compare_super = NULL;
 955         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
 956         if (IS_ERR(sb)) {
 957                 res = ERR_CAST(sb);
 958                 goto out;
 959         }
 960
 961         if (ceph_sb_to_client(sb) != fsc) {
 962                 ceph_mdsc_destroy(fsc);
 963                 destroy_fs_client(fsc);
 964                 fsc = ceph_sb_to_client(sb);
 965                 dout("get_sb got existing client %p\n", fsc);
 966         } else {
 967                 dout("get_sb using new client %p\n", fsc);
 968                 err = ceph_register_bdi(sb, fsc);
 969                 if (err < 0) {
 970                         res = ERR_PTR(err);
 971                         goto out_splat;
 972                 }
 973         }
 974
 975         res = ceph_real_mount(fsc, path);
 976         if (IS_ERR(res))
 977                 goto out_splat;
 978         dout("root %p inode %p ino %llx.%llx\n", res,
 979              res->d_inode, ceph_vinop(res->d_inode));
 980         return res;
 981
 982 out_splat:
 983         ceph_mdsc_close_sessions(fsc->mdsc);
 984         deactivate_locked_super(sb);
 985         goto out_final;
 986
 987 out:
 988         ceph_mdsc_destroy(fsc);
 989         destroy_fs_client(fsc);
 990 out_final:
 991         dout("ceph_mount fail %ld\n", PTR_ERR(res));
 992         return res;
 993 }
 994
 995 static void ceph_kill_sb(struct super_block *s)
 996 {
 997         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
 998         dev_t dev = s->s_dev;
 999
1000         dout("kill_sb %p\n", s);
1001
1002         ceph_mdsc_pre_umount(fsc->mdsc);
1003         generic_shutdown_super(s);
1004         ceph_mdsc_destroy(fsc);
1005
1006         destroy_fs_client(fsc);
1007         free_anon_bdev(dev);
1008 }
1009
1010 static struct file_system_type ceph_fs_type = {
1011         .owner          = THIS_MODULE,
1012         .name           = "ceph",
1013         .mount          = ceph_mount,
1014         .kill_sb        = ceph_kill_sb,
1015         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1016 };
1017 MODULE_ALIAS_FS("ceph");
1018
1019 static int __init init_ceph(void)
1020 {
1021         int ret = init_caches();
1022         if (ret)
1023                 goto out;
1024
1025         ceph_flock_init();
1026         ceph_xattr_init();
1027         ret = ceph_snap_init();
1028         if (ret)
1029                 goto out_xattr;
1030         ret = register_filesystem(&ceph_fs_type);
1031         if (ret)
1032                 goto out_snap;
1033
1034         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1035
1036         return 0;
1037
1038 out_snap:
1039         ceph_snap_exit();
1040 out_xattr:
1041         ceph_xattr_exit();
1042         destroy_caches();
1043 out:
1044         return ret;
1045 }
1046
1047 static void __exit exit_ceph(void)
1048 {
1049         dout("exit_ceph\n");
1050         unregister_filesystem(&ceph_fs_type);
1051         ceph_snap_exit();
1052         ceph_xattr_exit();
1053         destroy_caches();
1054 }
1055
1056 module_init(init_ceph);
1057 module_exit(exit_ceph);
1058
1059 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1060 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1061 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1062 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1063 MODULE_LICENSE("GPL");