fs/ceph/super.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/ceph/ceph_debug.h>
   4
   5 #include <linux/backing-dev.h>
   6 #include <linux/ctype.h>
   7 #include <linux/fs.h>
   8 #include <linux/inet.h>
   9 #include <linux/in6.h>
  10 #include <linux/module.h>
  11 #include <linux/mount.h>
  12 #include <linux/fs_context.h>
  13 #include <linux/fs_parser.h>
  14 #include <linux/sched.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/slab.h>
  17 #include <linux/statfs.h>
  18 #include <linux/string.h>
  19
  20 #include "super.h"
  21 #include "mds_client.h"
  22 #include "cache.h"
  23
  24 #include <linux/ceph/ceph_features.h>
  25 #include <linux/ceph/decode.h>
  26 #include <linux/ceph/mon_client.h>
  27 #include <linux/ceph/auth.h>
  28 #include <linux/ceph/debugfs.h>
  29
  30 /*
  31  * Ceph superblock operations
  32  *
  33  * Handle the basics of mounting, unmounting.
  34  */
  35
  36 /*
  37  * super ops
  38  */
  39 static void ceph_put_super(struct super_block *s)
  40 {
  41         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  42
  43         dout("put_super\n");
  44         ceph_mdsc_close_sessions(fsc->mdsc);
  45 }
  46
  47 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  48 {
  49         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  50         struct ceph_mon_client *monc = &fsc->client->monc;
  51         struct ceph_statfs st;
  52         u64 fsid;
  53         int err;
  54         u64 data_pool;
  55
  56         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  57                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  58         } else {
  59                 data_pool = CEPH_NOPOOL;
  60         }
  61
  62         dout("statfs\n");
  63         err = ceph_monc_do_statfs(monc, data_pool, &st);
  64         if (err < 0)
  65                 return err;
  66
  67         /* fill in kstatfs */
  68         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  69
  70         /*
  71          * express utilization in terms of large blocks to avoid
  72          * overflow on 32-bit machines.
  73          *
  74          * NOTE: for the time being, we make bsize == frsize to humor
  75          * not-yet-ancient versions of glibc that are broken.
  76          * Someday, we will probably want to report a real block
  77          * size...  whatever that may mean for a network file system!
  78          */
  79         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  80         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  81
  82         /*
  83          * By default use root quota for stats; fallback to overall filesystem
  84          * usage if using 'noquotadf' mount option or if the root dir doesn't
  85          * have max_bytes quota set.
  86          */
  87         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  88             !ceph_quota_update_statfs(fsc, buf)) {
  89                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  90                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  91                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  92         }
  93
  94         buf->f_files = le64_to_cpu(st.num_objects);
  95         buf->f_ffree = -1;
  96         buf->f_namelen = NAME_MAX;
  97
  98         /* Must convert the fsid, for consistent values across arches */
  99         mutex_lock(&monc->mutex);
 100         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
 101                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 102         mutex_unlock(&monc->mutex);
 103
 104         buf->f_fsid.val[0] = fsid & 0xffffffff;
 105         buf->f_fsid.val[1] = fsid >> 32;
 106
 107         return 0;
 108 }
 109
 110 static int ceph_sync_fs(struct super_block *sb, int wait)
 111 {
 112         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 113
 114         if (!wait) {
 115                 dout("sync_fs (non-blocking)\n");
 116                 ceph_flush_dirty_caps(fsc->mdsc);
 117                 dout("sync_fs (non-blocking) done\n");
 118                 return 0;
 119         }
 120
 121         dout("sync_fs (blocking)\n");
 122         ceph_osdc_sync(&fsc->client->osdc);
 123         ceph_mdsc_sync(fsc->mdsc);
 124         dout("sync_fs (blocking) done\n");
 125         return 0;
 126 }
 127
 128 /*
 129  * mount options
 130  */
 131 enum {
 132         Opt_wsize,
 133         Opt_rsize,
 134         Opt_rasize,
 135         Opt_caps_wanted_delay_min,
 136         Opt_caps_wanted_delay_max,
 137         Opt_caps_max,
 138         Opt_readdir_max_entries,
 139         Opt_readdir_max_bytes,
 140         Opt_congestion_kb,
 141         /* int args above */
 142         Opt_snapdirname,
 143         Opt_mds_namespace,
 144         Opt_recover_session,
 145         Opt_source,
 146         /* string args above */
 147         Opt_dirstat,
 148         Opt_rbytes,
 149         Opt_asyncreaddir,
 150         Opt_dcache,
 151         Opt_ino32,
 152         Opt_fscache,
 153         Opt_poolperm,
 154         Opt_require_active_mds,
 155         Opt_acl,
 156         Opt_quotadf,
 157         Opt_copyfrom,
 158 };
 159
 160 enum ceph_recover_session_mode {
 161         ceph_recover_session_no,
 162         ceph_recover_session_clean
 163 };
 164
 165 static const struct constant_table ceph_param_recover[] = {
 166         { "no",         ceph_recover_session_no },
 167         { "clean",      ceph_recover_session_clean },
 168         {}
 169 };
 170
 171 static const struct fs_parameter_spec ceph_mount_parameters[] = {
 172         fsparam_flag_no ("acl",                         Opt_acl),
 173         fsparam_flag_no ("asyncreaddir",                Opt_asyncreaddir),
 174         fsparam_s32     ("caps_max",                    Opt_caps_max),
 175         fsparam_u32     ("caps_wanted_delay_max",       Opt_caps_wanted_delay_max),
 176         fsparam_u32     ("caps_wanted_delay_min",       Opt_caps_wanted_delay_min),
 177         fsparam_u32     ("write_congestion_kb",         Opt_congestion_kb),
 178         fsparam_flag_no ("copyfrom",                    Opt_copyfrom),
 179         fsparam_flag_no ("dcache",                      Opt_dcache),
 180         fsparam_flag_no ("dirstat",                     Opt_dirstat),
 181         fsparam_flag_no ("fsc",                         Opt_fscache), // fsc|nofsc
 182         fsparam_string  ("fsc",                         Opt_fscache), // fsc=...
 183         fsparam_flag_no ("ino32",                       Opt_ino32),
 184         fsparam_string  ("mds_namespace",               Opt_mds_namespace),
 185         fsparam_flag_no ("poolperm",                    Opt_poolperm),
 186         fsparam_flag_no ("quotadf",                     Opt_quotadf),
 187         fsparam_u32     ("rasize",                      Opt_rasize),
 188         fsparam_flag_no ("rbytes",                      Opt_rbytes),
 189         fsparam_u32     ("readdir_max_bytes",           Opt_readdir_max_bytes),
 190         fsparam_u32     ("readdir_max_entries",         Opt_readdir_max_entries),
 191         fsparam_enum    ("recover_session",             Opt_recover_session, ceph_param_recover),
 192         fsparam_flag_no ("require_active_mds",          Opt_require_active_mds),
 193         fsparam_u32     ("rsize",                       Opt_rsize),
 194         fsparam_string  ("snapdirname",                 Opt_snapdirname),
 195         fsparam_string  ("source",                      Opt_source),
 196         fsparam_u32     ("wsize",                       Opt_wsize),
 197         {}
 198 };
 199
 200 struct ceph_parse_opts_ctx {
 201         struct ceph_options             *copts;
 202         struct ceph_mount_options       *opts;
 203 };
 204
 205 /*
 206  * Remove adjacent slashes and then the trailing slash, unless it is
 207  * the only remaining character.
 208  *
 209  * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
 210  */
 211 static void canonicalize_path(char *path)
 212 {
 213         int i, j = 0;
 214
 215         for (i = 0; path[i] != '\0'; i++) {
 216                 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
 217                         path[j++] = path[i];
 218         }
 219
 220         if (j > 1 && path[j - 1] == '/')
 221                 j--;
 222         path[j] = '\0';
 223 }
 224
 225 /*
 226  * Parse the source parameter.  Distinguish the server list from the path.
 227  *
 228  * The source will look like:
 229  *     <server_spec>[,<server_spec>...]:[<path>]
 230  * where
 231  *     <server_spec> is <ip>[:<port>]
 232  *     <path> is optional, but if present must begin with '/'
 233  */
 234 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
 235 {
 236         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 237         struct ceph_mount_options *fsopt = pctx->opts;
 238         char *dev_name = param->string, *dev_name_end;
 239         int ret;
 240
 241         dout("%s '%s'\n", __func__, dev_name);
 242         if (!dev_name || !*dev_name)
 243                 return invalfc(fc, "Empty source");
 244
 245         dev_name_end = strchr(dev_name, '/');
 246         if (dev_name_end) {
 247                 /*
 248                  * The server_path will include the whole chars from userland
 249                  * including the leading '/'.
 250                  */
 251                 kfree(fsopt->server_path);
 252                 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 253                 if (!fsopt->server_path)
 254                         return -ENOMEM;
 255
 256                 canonicalize_path(fsopt->server_path);
 257         } else {
 258                 dev_name_end = dev_name + strlen(dev_name);
 259         }
 260
 261         dev_name_end--;         /* back up to ':' separator */
 262         if (dev_name_end < dev_name || *dev_name_end != ':')
 263                 return invalfc(fc, "No path or : separator in source");
 264
 265         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 266         if (fsopt->server_path)
 267                 dout("server path '%s'\n", fsopt->server_path);
 268
 269         ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
 270                                  pctx->copts, fc->log.log);
 271         if (ret)
 272                 return ret;
 273
 274         fc->source = param->string;
 275         param->string = NULL;
 276         return 0;
 277 }
 278
 279 static int ceph_parse_mount_param(struct fs_context *fc,
 280                                   struct fs_parameter *param)
 281 {
 282         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 283         struct ceph_mount_options *fsopt = pctx->opts;
 284         struct fs_parse_result result;
 285         unsigned int mode;
 286         int token, ret;
 287
 288         ret = ceph_parse_param(param, pctx->copts, fc->log.log);
 289         if (ret != -ENOPARAM)
 290                 return ret;
 291
 292         token = fs_parse(fc, ceph_mount_parameters, param, &result);
 293         dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
 294         if (token < 0)
 295                 return token;
 296
 297         switch (token) {
 298         case Opt_snapdirname:
 299                 kfree(fsopt->snapdir_name);
 300                 fsopt->snapdir_name = param->string;
 301                 param->string = NULL;
 302                 break;
 303         case Opt_mds_namespace:
 304                 kfree(fsopt->mds_namespace);
 305                 fsopt->mds_namespace = param->string;
 306                 param->string = NULL;
 307                 break;
 308         case Opt_recover_session:
 309                 mode = result.uint_32;
 310                 if (mode == ceph_recover_session_no)
 311                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 312                 else if (mode == ceph_recover_session_clean)
 313                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 314                 else
 315                         BUG();
 316                 break;
 317         case Opt_source:
 318                 if (fc->source)
 319                         return invalfc(fc, "Multiple sources specified");
 320                 return ceph_parse_source(param, fc);
 321         case Opt_wsize:
 322                 if (result.uint_32 < PAGE_SIZE ||
 323                     result.uint_32 > CEPH_MAX_WRITE_SIZE)
 324                         goto out_of_range;
 325                 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
 326                 break;
 327         case Opt_rsize:
 328                 if (result.uint_32 < PAGE_SIZE ||
 329                     result.uint_32 > CEPH_MAX_READ_SIZE)
 330                         goto out_of_range;
 331                 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
 332                 break;
 333         case Opt_rasize:
 334                 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
 335                 break;
 336         case Opt_caps_wanted_delay_min:
 337                 if (result.uint_32 < 1)
 338                         goto out_of_range;
 339                 fsopt->caps_wanted_delay_min = result.uint_32;
 340                 break;
 341         case Opt_caps_wanted_delay_max:
 342                 if (result.uint_32 < 1)
 343                         goto out_of_range;
 344                 fsopt->caps_wanted_delay_max = result.uint_32;
 345                 break;
 346         case Opt_caps_max:
 347                 if (result.int_32 < 0)
 348                         goto out_of_range;
 349                 fsopt->caps_max = result.int_32;
 350                 break;
 351         case Opt_readdir_max_entries:
 352                 if (result.uint_32 < 1)
 353                         goto out_of_range;
 354                 fsopt->max_readdir = result.uint_32;
 355                 break;
 356         case Opt_readdir_max_bytes:
 357                 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
 358                         goto out_of_range;
 359                 fsopt->max_readdir_bytes = result.uint_32;
 360                 break;
 361         case Opt_congestion_kb:
 362                 if (result.uint_32 < 1024) /* at least 1M */
 363                         goto out_of_range;
 364                 fsopt->congestion_kb = result.uint_32;
 365                 break;
 366         case Opt_dirstat:
 367                 if (!result.negated)
 368                         fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 369                 else
 370                         fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 371                 break;
 372         case Opt_rbytes:
 373                 if (!result.negated)
 374                         fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 375                 else
 376                         fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 377                 break;
 378         case Opt_asyncreaddir:
 379                 if (!result.negated)
 380                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 381                 else
 382                         fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 383                 break;
 384         case Opt_dcache:
 385                 if (!result.negated)
 386                         fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 387                 else
 388                         fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 389                 break;
 390         case Opt_ino32:
 391                 if (!result.negated)
 392                         fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 393                 else
 394                         fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 395                 break;
 396
 397         case Opt_fscache:
 398 #ifdef CONFIG_CEPH_FSCACHE
 399                 kfree(fsopt->fscache_uniq);
 400                 fsopt->fscache_uniq = NULL;
 401                 if (result.negated) {
 402                         fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 403                 } else {
 404                         fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 405                         fsopt->fscache_uniq = param->string;
 406                         param->string = NULL;
 407                 }
 408                 break;
 409 #else
 410                 return invalfc(fc, "fscache support is disabled");
 411 #endif
 412         case Opt_poolperm:
 413                 if (!result.negated)
 414                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 415                 else
 416                         fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 417                 break;
 418         case Opt_require_active_mds:
 419                 if (!result.negated)
 420                         fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 421                 else
 422                         fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 423                 break;
 424         case Opt_quotadf:
 425                 if (!result.negated)
 426                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 427                 else
 428                         fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 429                 break;
 430         case Opt_copyfrom:
 431                 if (!result.negated)
 432                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 433                 else
 434                         fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 435                 break;
 436         case Opt_acl:
 437                 if (!result.negated) {
 438 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 439                         fc->sb_flags |= SB_POSIXACL;
 440 #else
 441                         return invalfc(fc, "POSIX ACL support is disabled");
 442 #endif
 443                 } else {
 444                         fc->sb_flags &= ~SB_POSIXACL;
 445                 }
 446                 break;
 447         default:
 448                 BUG();
 449         }
 450         return 0;
 451
 452 out_of_range:
 453         return invalfc(fc, "%s out of range", param->key);
 454 }
 455
 456 static void destroy_mount_options(struct ceph_mount_options *args)
 457 {
 458         dout("destroy_mount_options %p\n", args);
 459         if (!args)
 460                 return;
 461
 462         kfree(args->snapdir_name);
 463         kfree(args->mds_namespace);
 464         kfree(args->server_path);
 465         kfree(args->fscache_uniq);
 466         kfree(args);
 467 }
 468
 469 static int strcmp_null(const char *s1, const char *s2)
 470 {
 471         if (!s1 && !s2)
 472                 return 0;
 473         if (s1 && !s2)
 474                 return -1;
 475         if (!s1 && s2)
 476                 return 1;
 477         return strcmp(s1, s2);
 478 }
 479
 480 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 481                                  struct ceph_options *new_opt,
 482                                  struct ceph_fs_client *fsc)
 483 {
 484         struct ceph_mount_options *fsopt1 = new_fsopt;
 485         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 486         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 487         int ret;
 488
 489         ret = memcmp(fsopt1, fsopt2, ofs);
 490         if (ret)
 491                 return ret;
 492
 493         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 494         if (ret)
 495                 return ret;
 496
 497         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 498         if (ret)
 499                 return ret;
 500
 501         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 502         if (ret)
 503                 return ret;
 504
 505         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 506         if (ret)
 507                 return ret;
 508
 509         return ceph_compare_options(new_opt, fsc->client);
 510 }
 511
 512 /**
 513  * ceph_show_options - Show mount options in /proc/mounts
 514  * @m: seq_file to write to
 515  * @root: root of that (sub)tree
 516  */
 517 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 518 {
 519         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 520         struct ceph_mount_options *fsopt = fsc->mount_options;
 521         size_t pos;
 522         int ret;
 523
 524         /* a comma between MNT/MS and client options */
 525         seq_putc(m, ',');
 526         pos = m->count;
 527
 528         ret = ceph_print_client_options(m, fsc->client, false);
 529         if (ret)
 530                 return ret;
 531
 532         /* retract our comma if no client options */
 533         if (m->count == pos)
 534                 m->count--;
 535
 536         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 537                 seq_puts(m, ",dirstat");
 538         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 539                 seq_puts(m, ",rbytes");
 540         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 541                 seq_puts(m, ",noasyncreaddir");
 542         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 543                 seq_puts(m, ",nodcache");
 544         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 545                 seq_puts(m, ",ino32");
 546         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 547                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 548         }
 549         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 550                 seq_puts(m, ",nopoolperm");
 551         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 552                 seq_puts(m, ",noquotadf");
 553
 554 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 555         if (root->d_sb->s_flags & SB_POSIXACL)
 556                 seq_puts(m, ",acl");
 557         else
 558                 seq_puts(m, ",noacl");
 559 #endif
 560
 561         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 562                 seq_puts(m, ",copyfrom");
 563
 564         if (fsopt->mds_namespace)
 565                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 566
 567         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 568                 seq_show_option(m, "recover_session", "clean");
 569
 570         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 571                 seq_printf(m, ",wsize=%u", fsopt->wsize);
 572         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 573                 seq_printf(m, ",rsize=%u", fsopt->rsize);
 574         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 575                 seq_printf(m, ",rasize=%u", fsopt->rasize);
 576         if (fsopt->congestion_kb != default_congestion_kb())
 577                 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
 578         if (fsopt->caps_max)
 579                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 580         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 581                 seq_printf(m, ",caps_wanted_delay_min=%u",
 582                          fsopt->caps_wanted_delay_min);
 583         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 584                 seq_printf(m, ",caps_wanted_delay_max=%u",
 585                            fsopt->caps_wanted_delay_max);
 586         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 587                 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
 588         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 589                 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
 590         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 591                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 592
 593         return 0;
 594 }
 595
 596 /*
 597  * handle any mon messages the standard library doesn't understand.
 598  * return error if we don't either.
 599  */
 600 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 601 {
 602         struct ceph_fs_client *fsc = client->private;
 603         int type = le16_to_cpu(msg->hdr.type);
 604
 605         switch (type) {
 606         case CEPH_MSG_MDS_MAP:
 607                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 608                 return 0;
 609         case CEPH_MSG_FS_MAP_USER:
 610                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 611                 return 0;
 612         default:
 613                 return -1;
 614         }
 615 }
 616
 617 /*
 618  * create a new fs client
 619  *
 620  * Success or not, this function consumes @fsopt and @opt.
 621  */
 622 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 623                                         struct ceph_options *opt)
 624 {
 625         struct ceph_fs_client *fsc;
 626         int page_count;
 627         size_t size;
 628         int err;
 629
 630         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 631         if (!fsc) {
 632                 err = -ENOMEM;
 633                 goto fail;
 634         }
 635
 636         fsc->client = ceph_create_client(opt, fsc);
 637         if (IS_ERR(fsc->client)) {
 638                 err = PTR_ERR(fsc->client);
 639                 goto fail;
 640         }
 641         opt = NULL; /* fsc->client now owns this */
 642
 643         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 644         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 645
 646         if (!fsopt->mds_namespace) {
 647                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 648                                    0, true);
 649         } else {
 650                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 651                                    0, false);
 652         }
 653
 654         fsc->mount_options = fsopt;
 655
 656         fsc->sb = NULL;
 657         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 658         fsc->filp_gen = 1;
 659         fsc->have_copy_from2 = true;
 660
 661         atomic_long_set(&fsc->writeback_count, 0);
 662
 663         err = -ENOMEM;
 664         /*
 665          * The number of concurrent works can be high but they don't need
 666          * to be processed in parallel, limit concurrency.
 667          */
 668         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 669         if (!fsc->inode_wq)
 670                 goto fail_client;
 671         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 672         if (!fsc->cap_wq)
 673                 goto fail_inode_wq;
 674
 675         /* set up mempools */
 676         err = -ENOMEM;
 677         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 678         size = sizeof (struct page *) * (page_count ? page_count : 1);
 679         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 680         if (!fsc->wb_pagevec_pool)
 681                 goto fail_cap_wq;
 682
 683         return fsc;
 684
 685 fail_cap_wq:
 686         destroy_workqueue(fsc->cap_wq);
 687 fail_inode_wq:
 688         destroy_workqueue(fsc->inode_wq);
 689 fail_client:
 690         ceph_destroy_client(fsc->client);
 691 fail:
 692         kfree(fsc);
 693         if (opt)
 694                 ceph_destroy_options(opt);
 695         destroy_mount_options(fsopt);
 696         return ERR_PTR(err);
 697 }
 698
 699 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 700 {
 701         flush_workqueue(fsc->inode_wq);
 702         flush_workqueue(fsc->cap_wq);
 703 }
 704
 705 static void destroy_fs_client(struct ceph_fs_client *fsc)
 706 {
 707         dout("destroy_fs_client %p\n", fsc);
 708
 709         ceph_mdsc_destroy(fsc);
 710         destroy_workqueue(fsc->inode_wq);
 711         destroy_workqueue(fsc->cap_wq);
 712
 713         mempool_destroy(fsc->wb_pagevec_pool);
 714
 715         destroy_mount_options(fsc->mount_options);
 716
 717         ceph_destroy_client(fsc->client);
 718
 719         kfree(fsc);
 720         dout("destroy_fs_client %p done\n", fsc);
 721 }
 722
 723 /*
 724  * caches
 725  */
 726 struct kmem_cache *ceph_inode_cachep;
 727 struct kmem_cache *ceph_cap_cachep;
 728 struct kmem_cache *ceph_cap_flush_cachep;
 729 struct kmem_cache *ceph_dentry_cachep;
 730 struct kmem_cache *ceph_file_cachep;
 731 struct kmem_cache *ceph_dir_file_cachep;
 732
 733 static void ceph_inode_init_once(void *foo)
 734 {
 735         struct ceph_inode_info *ci = foo;
 736         inode_init_once(&ci->vfs_inode);
 737 }
 738
 739 static int __init init_caches(void)
 740 {
 741         int error = -ENOMEM;
 742
 743         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 744                                       sizeof(struct ceph_inode_info),
 745                                       __alignof__(struct ceph_inode_info),
 746                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 747                                       SLAB_ACCOUNT, ceph_inode_init_once);
 748         if (!ceph_inode_cachep)
 749                 return -ENOMEM;
 750
 751         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 752         if (!ceph_cap_cachep)
 753                 goto bad_cap;
 754         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 755                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 756         if (!ceph_cap_flush_cachep)
 757                 goto bad_cap_flush;
 758
 759         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 760                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 761         if (!ceph_dentry_cachep)
 762                 goto bad_dentry;
 763
 764         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 765         if (!ceph_file_cachep)
 766                 goto bad_file;
 767
 768         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 769         if (!ceph_dir_file_cachep)
 770                 goto bad_dir_file;
 771
 772         error = ceph_fscache_register();
 773         if (error)
 774                 goto bad_fscache;
 775
 776         return 0;
 777
 778 bad_fscache:
 779         kmem_cache_destroy(ceph_dir_file_cachep);
 780 bad_dir_file:
 781         kmem_cache_destroy(ceph_file_cachep);
 782 bad_file:
 783         kmem_cache_destroy(ceph_dentry_cachep);
 784 bad_dentry:
 785         kmem_cache_destroy(ceph_cap_flush_cachep);
 786 bad_cap_flush:
 787         kmem_cache_destroy(ceph_cap_cachep);
 788 bad_cap:
 789         kmem_cache_destroy(ceph_inode_cachep);
 790         return error;
 791 }
 792
 793 static void destroy_caches(void)
 794 {
 795         /*
 796          * Make sure all delayed rcu free inodes are flushed before we
 797          * destroy cache.
 798          */
 799         rcu_barrier();
 800
 801         kmem_cache_destroy(ceph_inode_cachep);
 802         kmem_cache_destroy(ceph_cap_cachep);
 803         kmem_cache_destroy(ceph_cap_flush_cachep);
 804         kmem_cache_destroy(ceph_dentry_cachep);
 805         kmem_cache_destroy(ceph_file_cachep);
 806         kmem_cache_destroy(ceph_dir_file_cachep);
 807
 808         ceph_fscache_unregister();
 809 }
 810
 811 /*
 812  * ceph_umount_begin - initiate forced umount.  Tear down down the
 813  * mount, skipping steps that may hang while waiting for server(s).
 814  */
 815 static void ceph_umount_begin(struct super_block *sb)
 816 {
 817         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 818
 819         dout("ceph_umount_begin - starting forced umount\n");
 820         if (!fsc)
 821                 return;
 822         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 823         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 824         ceph_mdsc_force_umount(fsc->mdsc);
 825         fsc->filp_gen++; // invalidate open files
 826 }
 827
 828 static const struct super_operations ceph_super_ops = {
 829         .alloc_inode    = ceph_alloc_inode,
 830         .free_inode     = ceph_free_inode,
 831         .write_inode    = ceph_write_inode,
 832         .drop_inode     = generic_delete_inode,
 833         .evict_inode    = ceph_evict_inode,
 834         .sync_fs        = ceph_sync_fs,
 835         .put_super      = ceph_put_super,
 836         .show_options   = ceph_show_options,
 837         .statfs         = ceph_statfs,
 838         .umount_begin   = ceph_umount_begin,
 839 };
 840
 841 /*
 842  * Bootstrap mount by opening the root directory.  Note the mount
 843  * @started time from caller, and time out if this takes too long.
 844  */
 845 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 846                                        const char *path,
 847                                        unsigned long started)
 848 {
 849         struct ceph_mds_client *mdsc = fsc->mdsc;
 850         struct ceph_mds_request *req = NULL;
 851         int err;
 852         struct dentry *root;
 853
 854         /* open dir */
 855         dout("open_root_inode opening '%s'\n", path);
 856         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 857         if (IS_ERR(req))
 858                 return ERR_CAST(req);
 859         req->r_path1 = kstrdup(path, GFP_NOFS);
 860         if (!req->r_path1) {
 861                 root = ERR_PTR(-ENOMEM);
 862                 goto out;
 863         }
 864
 865         req->r_ino1.ino = CEPH_INO_ROOT;
 866         req->r_ino1.snap = CEPH_NOSNAP;
 867         req->r_started = started;
 868         req->r_timeout = fsc->client->options->mount_timeout;
 869         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 870         req->r_num_caps = 2;
 871         err = ceph_mdsc_do_request(mdsc, NULL, req);
 872         if (err == 0) {
 873                 struct inode *inode = req->r_target_inode;
 874                 req->r_target_inode = NULL;
 875                 dout("open_root_inode success\n");
 876                 root = d_make_root(inode);
 877                 if (!root) {
 878                         root = ERR_PTR(-ENOMEM);
 879                         goto out;
 880                 }
 881                 dout("open_root_inode success, root dentry is %p\n", root);
 882         } else {
 883                 root = ERR_PTR(err);
 884         }
 885 out:
 886         ceph_mdsc_put_request(req);
 887         return root;
 888 }
 889
 890 /*
 891  * mount: join the ceph cluster, and open root directory.
 892  */
 893 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 894                                       struct fs_context *fc)
 895 {
 896         int err;
 897         unsigned long started = jiffies;  /* note the start time */
 898         struct dentry *root;
 899
 900         dout("mount start %p\n", fsc);
 901         mutex_lock(&fsc->client->mount_mutex);
 902
 903         if (!fsc->sb->s_root) {
 904                 const char *path = fsc->mount_options->server_path ?
 905                                      fsc->mount_options->server_path + 1 : "";
 906
 907                 err = __ceph_open_session(fsc->client, started);
 908                 if (err < 0)
 909                         goto out;
 910
 911                 /* setup fscache */
 912                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 913                         err = ceph_fscache_register_fs(fsc, fc);
 914                         if (err < 0)
 915                                 goto out;
 916                 }
 917
 918                 dout("mount opening path '%s'\n", path);
 919
 920                 ceph_fs_debugfs_init(fsc);
 921
 922                 root = open_root_dentry(fsc, path, started);
 923                 if (IS_ERR(root)) {
 924                         err = PTR_ERR(root);
 925                         goto out;
 926                 }
 927                 fsc->sb->s_root = dget(root);
 928         } else {
 929                 root = dget(fsc->sb->s_root);
 930         }
 931
 932         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 933         dout("mount success\n");
 934         mutex_unlock(&fsc->client->mount_mutex);
 935         return root;
 936
 937 out:
 938         mutex_unlock(&fsc->client->mount_mutex);
 939         return ERR_PTR(err);
 940 }
 941
 942 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
 943 {
 944         struct ceph_fs_client *fsc = s->s_fs_info;
 945         int ret;
 946
 947         dout("set_super %p\n", s);
 948
 949         s->s_maxbytes = MAX_LFS_FILESIZE;
 950
 951         s->s_xattr = ceph_xattr_handlers;
 952         fsc->sb = s;
 953         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 954
 955         s->s_op = &ceph_super_ops;
 956         s->s_d_op = &ceph_dentry_ops;
 957         s->s_export_op = &ceph_export_ops;
 958
 959         s->s_time_gran = 1;
 960         s->s_time_min = 0;
 961         s->s_time_max = U32_MAX;
 962
 963         ret = set_anon_super_fc(s, fc);
 964         if (ret != 0)
 965                 fsc->sb = NULL;
 966         return ret;
 967 }
 968
 969 /*
 970  * share superblock if same fs AND options
 971  */
 972 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
 973 {
 974         struct ceph_fs_client *new = fc->s_fs_info;
 975         struct ceph_mount_options *fsopt = new->mount_options;
 976         struct ceph_options *opt = new->client->options;
 977         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 978
 979         dout("ceph_compare_super %p\n", sb);
 980
 981         if (compare_mount_options(fsopt, opt, other)) {
 982                 dout("monitor(s)/mount options don't match\n");
 983                 return 0;
 984         }
 985         if ((opt->flags & CEPH_OPT_FSID) &&
 986             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 987                 dout("fsid doesn't match\n");
 988                 return 0;
 989         }
 990         if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
 991                 dout("flags differ\n");
 992                 return 0;
 993         }
 994         return 1;
 995 }
 996
 997 /*
 998  * construct our own bdi so we can control readahead, etc.
 999  */
1000 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1001
1002 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1003 {
1004         int err;
1005
1006         err = super_setup_bdi_name(sb, "ceph-%ld",
1007                                    atomic_long_inc_return(&bdi_seq));
1008         if (err)
1009                 return err;
1010
1011         /* set ra_pages based on rasize mount option? */
1012         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1013
1014         /* set io_pages based on max osd read size */
1015         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1016
1017         return 0;
1018 }
1019
1020 static int ceph_get_tree(struct fs_context *fc)
1021 {
1022         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1023         struct super_block *sb;
1024         struct ceph_fs_client *fsc;
1025         struct dentry *res;
1026         int (*compare_super)(struct super_block *, struct fs_context *) =
1027                 ceph_compare_super;
1028         int err;
1029
1030         dout("ceph_get_tree\n");
1031
1032         if (!fc->source)
1033                 return invalfc(fc, "No source");
1034
1035         /* create client (which we may/may not use) */
1036         fsc = create_fs_client(pctx->opts, pctx->copts);
1037         pctx->opts = NULL;
1038         pctx->copts = NULL;
1039         if (IS_ERR(fsc)) {
1040                 err = PTR_ERR(fsc);
1041                 goto out_final;
1042         }
1043
1044         err = ceph_mdsc_init(fsc);
1045         if (err < 0)
1046                 goto out;
1047
1048         if (ceph_test_opt(fsc->client, NOSHARE))
1049                 compare_super = NULL;
1050
1051         fc->s_fs_info = fsc;
1052         sb = sget_fc(fc, compare_super, ceph_set_super);
1053         fc->s_fs_info = NULL;
1054         if (IS_ERR(sb)) {
1055                 err = PTR_ERR(sb);
1056                 goto out;
1057         }
1058
1059         if (ceph_sb_to_client(sb) != fsc) {
1060                 destroy_fs_client(fsc);
1061                 fsc = ceph_sb_to_client(sb);
1062                 dout("get_sb got existing client %p\n", fsc);
1063         } else {
1064                 dout("get_sb using new client %p\n", fsc);
1065                 err = ceph_setup_bdi(sb, fsc);
1066                 if (err < 0)
1067                         goto out_splat;
1068         }
1069
1070         res = ceph_real_mount(fsc, fc);
1071         if (IS_ERR(res)) {
1072                 err = PTR_ERR(res);
1073                 goto out_splat;
1074         }
1075         dout("root %p inode %p ino %llx.%llx\n", res,
1076              d_inode(res), ceph_vinop(d_inode(res)));
1077         fc->root = fsc->sb->s_root;
1078         return 0;
1079
1080 out_splat:
1081         if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1082                 pr_info("No mds server is up or the cluster is laggy\n");
1083                 err = -EHOSTUNREACH;
1084         }
1085
1086         ceph_mdsc_close_sessions(fsc->mdsc);
1087         deactivate_locked_super(sb);
1088         goto out_final;
1089
1090 out:
1091         destroy_fs_client(fsc);
1092 out_final:
1093         dout("ceph_get_tree fail %d\n", err);
1094         return err;
1095 }
1096
1097 static void ceph_free_fc(struct fs_context *fc)
1098 {
1099         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1100
1101         if (pctx) {
1102                 destroy_mount_options(pctx->opts);
1103                 ceph_destroy_options(pctx->copts);
1104                 kfree(pctx);
1105         }
1106 }
1107
1108 static int ceph_reconfigure_fc(struct fs_context *fc)
1109 {
1110         sync_filesystem(fc->root->d_sb);
1111         return 0;
1112 }
1113
1114 static const struct fs_context_operations ceph_context_ops = {
1115         .free           = ceph_free_fc,
1116         .parse_param    = ceph_parse_mount_param,
1117         .get_tree       = ceph_get_tree,
1118         .reconfigure    = ceph_reconfigure_fc,
1119 };
1120
1121 /*
1122  * Set up the filesystem mount context.
1123  */
1124 static int ceph_init_fs_context(struct fs_context *fc)
1125 {
1126         struct ceph_parse_opts_ctx *pctx;
1127         struct ceph_mount_options *fsopt;
1128
1129         pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1130         if (!pctx)
1131                 return -ENOMEM;
1132
1133         pctx->copts = ceph_alloc_options();
1134         if (!pctx->copts)
1135                 goto nomem;
1136
1137         pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1138         if (!pctx->opts)
1139                 goto nomem;
1140
1141         fsopt = pctx->opts;
1142         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1143
1144         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1145         fsopt->rsize = CEPH_MAX_READ_SIZE;
1146         fsopt->rasize = CEPH_RASIZE_DEFAULT;
1147         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1148         if (!fsopt->snapdir_name)
1149                 goto nomem;
1150
1151         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1152         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1153         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1154         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1155         fsopt->congestion_kb = default_congestion_kb();
1156
1157 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1158         fc->sb_flags |= SB_POSIXACL;
1159 #endif
1160
1161         fc->fs_private = pctx;
1162         fc->ops = &ceph_context_ops;
1163         return 0;
1164
1165 nomem:
1166         destroy_mount_options(pctx->opts);
1167         ceph_destroy_options(pctx->copts);
1168         kfree(pctx);
1169         return -ENOMEM;
1170 }
1171
1172 static void ceph_kill_sb(struct super_block *s)
1173 {
1174         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1175         dev_t dev = s->s_dev;
1176
1177         dout("kill_sb %p\n", s);
1178
1179         ceph_mdsc_pre_umount(fsc->mdsc);
1180         flush_fs_workqueues(fsc);
1181
1182         generic_shutdown_super(s);
1183
1184         fsc->client->extra_mon_dispatch = NULL;
1185         ceph_fs_debugfs_cleanup(fsc);
1186
1187         ceph_fscache_unregister_fs(fsc);
1188
1189         destroy_fs_client(fsc);
1190         free_anon_bdev(dev);
1191 }
1192
1193 static struct file_system_type ceph_fs_type = {
1194         .owner          = THIS_MODULE,
1195         .name           = "ceph",
1196         .init_fs_context = ceph_init_fs_context,
1197         .kill_sb        = ceph_kill_sb,
1198         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1199 };
1200 MODULE_ALIAS_FS("ceph");
1201
1202 int ceph_force_reconnect(struct super_block *sb)
1203 {
1204         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1205         int err = 0;
1206
1207         ceph_umount_begin(sb);
1208
1209         /* Make sure all page caches get invalidated.
1210          * see remove_session_caps_cb() */
1211         flush_workqueue(fsc->inode_wq);
1212
1213         /* In case that we were blacklisted. This also reset
1214          * all mon/osd connections */
1215         ceph_reset_client_addr(fsc->client);
1216
1217         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1218
1219         fsc->blacklisted = false;
1220         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1221
1222         if (sb->s_root) {
1223                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1224                                         CEPH_STAT_CAP_INODE, true);
1225         }
1226         return err;
1227 }
1228
1229 static int __init init_ceph(void)
1230 {
1231         int ret = init_caches();
1232         if (ret)
1233                 goto out;
1234
1235         ceph_flock_init();
1236         ret = register_filesystem(&ceph_fs_type);
1237         if (ret)
1238                 goto out_caches;
1239
1240         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1241
1242         return 0;
1243
1244 out_caches:
1245         destroy_caches();
1246 out:
1247         return ret;
1248 }
1249
1250 static void __exit exit_ceph(void)
1251 {
1252         dout("exit_ceph\n");
1253         unregister_filesystem(&ceph_fs_type);
1254         destroy_caches();
1255 }
1256
1257 module_init(init_ceph);
1258 module_exit(exit_ceph);
1259
1260 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1261 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1262 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1263 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1264 MODULE_LICENSE("GPL");