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