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
 418         if (opt->name)
 419                 seq_printf(m, ",name=%s", opt->name);
 420         if (opt->key)
 421                 seq_puts(m, ",secret=<hidden>");
 422
 423         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
 424                 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
 425         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
 426                 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
 427         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
 428                 seq_printf(m, ",osdkeepalivetimeout=%d",
 429                            opt->osd_keepalive_timeout);
 430
 431         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 432                 seq_puts(m, ",dirstat");
 433         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
 434                 seq_puts(m, ",norbytes");
 435         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 436                 seq_puts(m, ",noasyncreaddir");
 437         if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
 438                 seq_puts(m, ",dcache");
 439         else
 440                 seq_puts(m, ",nodcache");
 441         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
 442                 seq_puts(m, ",fsc");
 443         else
 444                 seq_puts(m, ",nofsc");
 445
 446 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 447         if (fsopt->sb_flags & MS_POSIXACL)
 448                 seq_puts(m, ",acl");
 449         else
 450                 seq_puts(m, ",noacl");
 451 #endif
 452
 453         if (fsopt->wsize)
 454                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 455         if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
 456                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 457         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 458                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 459         if (fsopt->congestion_kb != default_congestion_kb())
 460                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 461         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 462                 seq_printf(m, ",caps_wanted_delay_min=%d",
 463                          fsopt->caps_wanted_delay_min);
 464         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 465                 seq_printf(m, ",caps_wanted_delay_max=%d",
 466                            fsopt->caps_wanted_delay_max);
 467         if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 468                 seq_printf(m, ",cap_release_safety=%d",
 469                            fsopt->cap_release_safety);
 470         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 471                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 472         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 473                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 474         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 475                 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
 476         return 0;
 477 }
 478
 479 /*
 480  * handle any mon messages the standard library doesn't understand.
 481  * return error if we don't either.
 482  */
 483 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 484 {
 485         struct ceph_fs_client *fsc = client->private;
 486         int type = le16_to_cpu(msg->hdr.type);
 487
 488         switch (type) {
 489         case CEPH_MSG_MDS_MAP:
 490                 ceph_mdsc_handle_map(fsc->mdsc, msg);
 491                 return 0;
 492
 493         default:
 494                 return -1;
 495         }
 496 }
 497
 498 /*
 499  * create a new fs client
 500  */
 501 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 502                                         struct ceph_options *opt)
 503 {
 504         struct ceph_fs_client *fsc;
 505         const u64 supported_features =
 506                 CEPH_FEATURE_FLOCK |
 507                 CEPH_FEATURE_DIRLAYOUTHASH |
 508                 CEPH_FEATURE_MDS_INLINE_DATA;
 509         const u64 required_features = 0;
 510         int page_count;
 511         size_t size;
 512         int err = -ENOMEM;
 513
 514         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 515         if (!fsc)
 516                 return ERR_PTR(-ENOMEM);
 517
 518         fsc->client = ceph_create_client(opt, fsc, supported_features,
 519                                          required_features);
 520         if (IS_ERR(fsc->client)) {
 521                 err = PTR_ERR(fsc->client);
 522                 goto fail;
 523         }
 524         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 525         fsc->client->monc.want_mdsmap = 1;
 526
 527         fsc->mount_options = fsopt;
 528
 529         fsc->sb = NULL;
 530         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 531
 532         atomic_long_set(&fsc->writeback_count, 0);
 533
 534         err = bdi_init(&fsc->backing_dev_info);
 535         if (err < 0)
 536                 goto fail_client;
 537
 538         err = -ENOMEM;
 539         /*
 540          * The number of concurrent works can be high but they don't need
 541          * to be processed in parallel, limit concurrency.
 542          */
 543         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 544         if (fsc->wb_wq == NULL)
 545                 goto fail_bdi;
 546         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 547         if (fsc->pg_inv_wq == NULL)
 548                 goto fail_wb_wq;
 549         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 550         if (fsc->trunc_wq == NULL)
 551                 goto fail_pg_inv_wq;
 552
 553         /* set up mempools */
 554         err = -ENOMEM;
 555         page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT;
 556         size = sizeof (struct page *) * (page_count ? page_count : 1);
 557         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 558         if (!fsc->wb_pagevec_pool)
 559                 goto fail_trunc_wq;
 560
 561         /* setup fscache */
 562         if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
 563             (ceph_fscache_register_fs(fsc) != 0))
 564                 goto fail_fscache;
 565
 566         /* caps */
 567         fsc->min_caps = fsopt->max_readdir;
 568
 569         return fsc;
 570
 571 fail_fscache:
 572         ceph_fscache_unregister_fs(fsc);
 573 fail_trunc_wq:
 574         destroy_workqueue(fsc->trunc_wq);
 575 fail_pg_inv_wq:
 576         destroy_workqueue(fsc->pg_inv_wq);
 577 fail_wb_wq:
 578         destroy_workqueue(fsc->wb_wq);
 579 fail_bdi:
 580         bdi_destroy(&fsc->backing_dev_info);
 581 fail_client:
 582         ceph_destroy_client(fsc->client);
 583 fail:
 584         kfree(fsc);
 585         return ERR_PTR(err);
 586 }
 587
 588 static void destroy_fs_client(struct ceph_fs_client *fsc)
 589 {
 590         dout("destroy_fs_client %p\n", fsc);
 591
 592         ceph_fscache_unregister_fs(fsc);
 593
 594         destroy_workqueue(fsc->wb_wq);
 595         destroy_workqueue(fsc->pg_inv_wq);
 596         destroy_workqueue(fsc->trunc_wq);
 597
 598         bdi_destroy(&fsc->backing_dev_info);
 599
 600         mempool_destroy(fsc->wb_pagevec_pool);
 601
 602         destroy_mount_options(fsc->mount_options);
 603
 604         ceph_fs_debugfs_cleanup(fsc);
 605
 606         ceph_destroy_client(fsc->client);
 607
 608         kfree(fsc);
 609         dout("destroy_fs_client %p done\n", fsc);
 610 }
 611
 612 /*
 613  * caches
 614  */
 615 struct kmem_cache *ceph_inode_cachep;
 616 struct kmem_cache *ceph_cap_cachep;
 617 struct kmem_cache *ceph_dentry_cachep;
 618 struct kmem_cache *ceph_file_cachep;
 619
 620 static void ceph_inode_init_once(void *foo)
 621 {
 622         struct ceph_inode_info *ci = foo;
 623         inode_init_once(&ci->vfs_inode);
 624 }
 625
 626 static int __init init_caches(void)
 627 {
 628         int error = -ENOMEM;
 629
 630         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 631                                       sizeof(struct ceph_inode_info),
 632                                       __alignof__(struct ceph_inode_info),
 633                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 634                                       ceph_inode_init_once);
 635         if (ceph_inode_cachep == NULL)
 636                 return -ENOMEM;
 637
 638         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 639                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 640         if (ceph_cap_cachep == NULL)
 641                 goto bad_cap;
 642
 643         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 644                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 645         if (ceph_dentry_cachep == NULL)
 646                 goto bad_dentry;
 647
 648         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 649                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 650         if (ceph_file_cachep == NULL)
 651                 goto bad_file;
 652
 653         if ((error = ceph_fscache_register()))
 654                 goto bad_file;
 655
 656         return 0;
 657 bad_file:
 658         kmem_cache_destroy(ceph_dentry_cachep);
 659 bad_dentry:
 660         kmem_cache_destroy(ceph_cap_cachep);
 661 bad_cap:
 662         kmem_cache_destroy(ceph_inode_cachep);
 663         return error;
 664 }
 665
 666 static void destroy_caches(void)
 667 {
 668         /*
 669          * Make sure all delayed rcu free inodes are flushed before we
 670          * destroy cache.
 671          */
 672         rcu_barrier();
 673
 674         kmem_cache_destroy(ceph_inode_cachep);
 675         kmem_cache_destroy(ceph_cap_cachep);
 676         kmem_cache_destroy(ceph_dentry_cachep);
 677         kmem_cache_destroy(ceph_file_cachep);
 678
 679         ceph_fscache_unregister();
 680 }
 681
 682
 683 /*
 684  * ceph_umount_begin - initiate forced umount.  Tear down down the
 685  * mount, skipping steps that may hang while waiting for server(s).
 686  */
 687 static void ceph_umount_begin(struct super_block *sb)
 688 {
 689         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 690
 691         dout("ceph_umount_begin - starting forced umount\n");
 692         if (!fsc)
 693                 return;
 694         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 695         return;
 696 }
 697
 698 static const struct super_operations ceph_super_ops = {
 699         .alloc_inode    = ceph_alloc_inode,
 700         .destroy_inode  = ceph_destroy_inode,
 701         .write_inode    = ceph_write_inode,
 702         .drop_inode     = ceph_drop_inode,
 703         .sync_fs        = ceph_sync_fs,
 704         .put_super      = ceph_put_super,
 705         .show_options   = ceph_show_options,
 706         .statfs         = ceph_statfs,
 707         .umount_begin   = ceph_umount_begin,
 708 };
 709
 710 /*
 711  * Bootstrap mount by opening the root directory.  Note the mount
 712  * @started time from caller, and time out if this takes too long.
 713  */
 714 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 715                                        const char *path,
 716                                        unsigned long started)
 717 {
 718         struct ceph_mds_client *mdsc = fsc->mdsc;
 719         struct ceph_mds_request *req = NULL;
 720         int err;
 721         struct dentry *root;
 722
 723         /* open dir */
 724         dout("open_root_inode opening '%s'\n", path);
 725         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 726         if (IS_ERR(req))
 727                 return ERR_CAST(req);
 728         req->r_path1 = kstrdup(path, GFP_NOFS);
 729         req->r_ino1.ino = CEPH_INO_ROOT;
 730         req->r_ino1.snap = CEPH_NOSNAP;
 731         req->r_started = started;
 732         req->r_timeout = fsc->client->options->mount_timeout * HZ;
 733         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 734         req->r_num_caps = 2;
 735         err = ceph_mdsc_do_request(mdsc, NULL, req);
 736         if (err == 0) {
 737                 struct inode *inode = req->r_target_inode;
 738                 req->r_target_inode = NULL;
 739                 dout("open_root_inode success\n");
 740                 if (ceph_ino(inode) == CEPH_INO_ROOT &&
 741                     fsc->sb->s_root == NULL) {
 742                         root = d_make_root(inode);
 743                         if (!root) {
 744                                 root = ERR_PTR(-ENOMEM);
 745                                 goto out;
 746                         }
 747                 } else {
 748                         root = d_obtain_root(inode);
 749                 }
 750                 ceph_init_dentry(root);
 751                 dout("open_root_inode success, root dentry is %p\n", root);
 752         } else {
 753                 root = ERR_PTR(err);
 754         }
 755 out:
 756         ceph_mdsc_put_request(req);
 757         return root;
 758 }
 759
 760
 761
 762
 763 /*
 764  * mount: join the ceph cluster, and open root directory.
 765  */
 766 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 767                       const char *path)
 768 {
 769         int err;
 770         unsigned long started = jiffies;  /* note the start time */
 771         struct dentry *root;
 772         int first = 0;   /* first vfsmount for this super_block */
 773
 774         dout("mount start\n");
 775         mutex_lock(&fsc->client->mount_mutex);
 776
 777         err = __ceph_open_session(fsc->client, started);
 778         if (err < 0)
 779                 goto out;
 780
 781         dout("mount opening root\n");
 782         root = open_root_dentry(fsc, "", started);
 783         if (IS_ERR(root)) {
 784                 err = PTR_ERR(root);
 785                 goto out;
 786         }
 787         if (fsc->sb->s_root) {
 788                 dput(root);
 789         } else {
 790                 fsc->sb->s_root = root;
 791                 first = 1;
 792
 793                 err = ceph_fs_debugfs_init(fsc);
 794                 if (err < 0)
 795                         goto fail;
 796         }
 797
 798         if (path[0] == 0) {
 799                 dget(root);
 800         } else {
 801                 dout("mount opening base mountpoint\n");
 802                 root = open_root_dentry(fsc, path, started);
 803                 if (IS_ERR(root)) {
 804                         err = PTR_ERR(root);
 805                         goto fail;
 806                 }
 807         }
 808
 809         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 810         dout("mount success\n");
 811         mutex_unlock(&fsc->client->mount_mutex);
 812         return root;
 813
 814 out:
 815         mutex_unlock(&fsc->client->mount_mutex);
 816         return ERR_PTR(err);
 817
 818 fail:
 819         if (first) {
 820                 dput(fsc->sb->s_root);
 821                 fsc->sb->s_root = NULL;
 822         }
 823         goto out;
 824 }
 825
 826 static int ceph_set_super(struct super_block *s, void *data)
 827 {
 828         struct ceph_fs_client *fsc = data;
 829         int ret;
 830
 831         dout("set_super %p data %p\n", s, data);
 832
 833         s->s_flags = fsc->mount_options->sb_flags;
 834         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 835
 836         s->s_xattr = ceph_xattr_handlers;
 837         s->s_fs_info = fsc;
 838         fsc->sb = s;
 839
 840         s->s_op = &ceph_super_ops;
 841         s->s_export_op = &ceph_export_ops;
 842
 843         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 844
 845         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 846         if (ret != 0)
 847                 goto fail;
 848
 849         return ret;
 850
 851 fail:
 852         s->s_fs_info = NULL;
 853         fsc->sb = NULL;
 854         return ret;
 855 }
 856
 857 /*
 858  * share superblock if same fs AND options
 859  */
 860 static int ceph_compare_super(struct super_block *sb, void *data)
 861 {
 862         struct ceph_fs_client *new = data;
 863         struct ceph_mount_options *fsopt = new->mount_options;
 864         struct ceph_options *opt = new->client->options;
 865         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 866
 867         dout("ceph_compare_super %p\n", sb);
 868
 869         if (compare_mount_options(fsopt, opt, other)) {
 870                 dout("monitor(s)/mount options don't match\n");
 871                 return 0;
 872         }
 873         if ((opt->flags & CEPH_OPT_FSID) &&
 874             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 875                 dout("fsid doesn't match\n");
 876                 return 0;
 877         }
 878         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 879                 dout("flags differ\n");
 880                 return 0;
 881         }
 882         return 1;
 883 }
 884
 885 /*
 886  * construct our own bdi so we can control readahead, etc.
 887  */
 888 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 889
 890 static int ceph_register_bdi(struct super_block *sb,
 891                              struct ceph_fs_client *fsc)
 892 {
 893         int err;
 894
 895         /* set ra_pages based on rasize mount option? */
 896         if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
 897                 fsc->backing_dev_info.ra_pages =
 898                         (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
 899                         >> PAGE_SHIFT;
 900         else
 901                 fsc->backing_dev_info.ra_pages =
 902                         VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE;
 903
 904         err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
 905                            atomic_long_inc_return(&bdi_seq));
 906         if (!err)
 907                 sb->s_bdi = &fsc->backing_dev_info;
 908         return err;
 909 }
 910
 911 static struct dentry *ceph_mount(struct file_system_type *fs_type,
 912                        int flags, const char *dev_name, void *data)
 913 {
 914         struct super_block *sb;
 915         struct ceph_fs_client *fsc;
 916         struct dentry *res;
 917         int err;
 918         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 919         const char *path = NULL;
 920         struct ceph_mount_options *fsopt = NULL;
 921         struct ceph_options *opt = NULL;
 922
 923         dout("ceph_mount\n");
 924
 925 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 926         flags |= MS_POSIXACL;
 927 #endif
 928         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
 929         if (err < 0) {
 930                 res = ERR_PTR(err);
 931                 goto out_final;
 932         }
 933
 934         /* create client (which we may/may not use) */
 935         fsc = create_fs_client(fsopt, opt);
 936         if (IS_ERR(fsc)) {
 937                 res = ERR_CAST(fsc);
 938                 destroy_mount_options(fsopt);
 939                 ceph_destroy_options(opt);
 940                 goto out_final;
 941         }
 942
 943         err = ceph_mdsc_init(fsc);
 944         if (err < 0) {
 945                 res = ERR_PTR(err);
 946                 goto out;
 947         }
 948
 949         if (ceph_test_opt(fsc->client, NOSHARE))
 950                 compare_super = NULL;
 951         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
 952         if (IS_ERR(sb)) {
 953                 res = ERR_CAST(sb);
 954                 goto out;
 955         }
 956
 957         if (ceph_sb_to_client(sb) != fsc) {
 958                 ceph_mdsc_destroy(fsc);
 959                 destroy_fs_client(fsc);
 960                 fsc = ceph_sb_to_client(sb);
 961                 dout("get_sb got existing client %p\n", fsc);
 962         } else {
 963                 dout("get_sb using new client %p\n", fsc);
 964                 err = ceph_register_bdi(sb, fsc);
 965                 if (err < 0) {
 966                         res = ERR_PTR(err);
 967                         goto out_splat;
 968                 }
 969         }
 970
 971         res = ceph_real_mount(fsc, path);
 972         if (IS_ERR(res))
 973                 goto out_splat;
 974         dout("root %p inode %p ino %llx.%llx\n", res,
 975              res->d_inode, ceph_vinop(res->d_inode));
 976         return res;
 977
 978 out_splat:
 979         ceph_mdsc_close_sessions(fsc->mdsc);
 980         deactivate_locked_super(sb);
 981         goto out_final;
 982
 983 out:
 984         ceph_mdsc_destroy(fsc);
 985         destroy_fs_client(fsc);
 986 out_final:
 987         dout("ceph_mount fail %ld\n", PTR_ERR(res));
 988         return res;
 989 }
 990
 991 static void ceph_kill_sb(struct super_block *s)
 992 {
 993         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
 994         dev_t dev = s->s_dev;
 995
 996         dout("kill_sb %p\n", s);
 997
 998         ceph_mdsc_pre_umount(fsc->mdsc);
 999         generic_shutdown_super(s);
1000         ceph_mdsc_destroy(fsc);
1001
1002         destroy_fs_client(fsc);
1003         free_anon_bdev(dev);
1004 }
1005
1006 static struct file_system_type ceph_fs_type = {
1007         .owner          = THIS_MODULE,
1008         .name           = "ceph",
1009         .mount          = ceph_mount,
1010         .kill_sb        = ceph_kill_sb,
1011         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1012 };
1013 MODULE_ALIAS_FS("ceph");
1014
1015 static int __init init_ceph(void)
1016 {
1017         int ret = init_caches();
1018         if (ret)
1019                 goto out;
1020
1021         ceph_flock_init();
1022         ceph_xattr_init();
1023         ret = ceph_snap_init();
1024         if (ret)
1025                 goto out_xattr;
1026         ret = register_filesystem(&ceph_fs_type);
1027         if (ret)
1028                 goto out_snap;
1029
1030         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1031
1032         return 0;
1033
1034 out_snap:
1035         ceph_snap_exit();
1036 out_xattr:
1037         ceph_xattr_exit();
1038         destroy_caches();
1039 out:
1040         return ret;
1041 }
1042
1043 static void __exit exit_ceph(void)
1044 {
1045         dout("exit_ceph\n");
1046         unregister_filesystem(&ceph_fs_type);
1047         ceph_snap_exit();
1048         ceph_xattr_exit();
1049         destroy_caches();
1050 }
1051
1052 module_init(init_ceph);
1053 module_exit(exit_ceph);
1054
1055 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1056 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1057 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1058 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1059 MODULE_LICENSE("GPL");