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