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_u32     ("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_s32     ("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_s32     ("readdir_max_bytes",           Opt_readdir_max_bytes),
 191         fsparam_s32     ("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                 fsopt->caps_max = result.uint_32;
 332                 break;
 333         case Opt_readdir_max_entries:
 334                 if (result.uint_32 < 1)
 335                         goto out_of_range;
 336                 fsopt->max_readdir = result.uint_32;
 337                 break;
 338         case Opt_readdir_max_bytes:
 339                 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
 340                         goto out_of_range;
 341                 fsopt->max_readdir_bytes = result.uint_32;
 342                 break;
 343         case Opt_congestion_kb:
 344                 if (result.uint_32 < 1024) /* at least 1M */
 345                         goto out_of_range;
 346                 fsopt->congestion_kb = result.uint_32;
 347                 break;
 348         case Opt_dirstat:
 349                 if (!result.negated)
 350                         fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 351                 else
 352                         fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 353                 break;
 354         case Opt_rbytes:
 355                 if (!result.negated)
 356                         fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 357                 else
 358                         fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 359                 break;
 360         case Opt_asyncreaddir:
 361                 if (!result.negated)
 362                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 363                 else
 364                         fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 365                 break;
 366         case Opt_dcache:
 367                 if (!result.negated)
 368                         fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 369                 else
 370                         fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 371                 break;
 372         case Opt_ino32:
 373                 if (!result.negated)
 374                         fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 375                 else
 376                         fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 377                 break;
 378
 379         case Opt_fscache:
 380 #ifdef CONFIG_CEPH_FSCACHE
 381                 kfree(fsopt->fscache_uniq);
 382                 fsopt->fscache_uniq = NULL;
 383                 if (result.negated) {
 384                         fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 385                 } else {
 386                         fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 387                         fsopt->fscache_uniq = param->string;
 388                         param->string = NULL;
 389                 }
 390                 break;
 391 #else
 392                 return invalf(fc, "ceph: fscache support is disabled");
 393 #endif
 394         case Opt_poolperm:
 395                 if (!result.negated)
 396                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 397                 else
 398                         fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 399                 break;
 400         case Opt_require_active_mds:
 401                 if (!result.negated)
 402                         fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 403                 else
 404                         fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 405                 break;
 406         case Opt_quotadf:
 407                 if (!result.negated)
 408                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 409                 else
 410                         fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 411                 break;
 412         case Opt_copyfrom:
 413                 if (!result.negated)
 414                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 415                 else
 416                         fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 417                 break;
 418         case Opt_acl:
 419                 if (!result.negated) {
 420 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 421                         fc->sb_flags |= SB_POSIXACL;
 422 #else
 423                         return invalf(fc, "ceph: POSIX ACL support is disabled");
 424 #endif
 425                 } else {
 426                         fc->sb_flags &= ~SB_POSIXACL;
 427                 }
 428                 break;
 429         default:
 430                 BUG();
 431         }
 432         return 0;
 433
 434 out_of_range:
 435         return invalf(fc, "ceph: %s out of range", param->key);
 436 }
 437
 438 static void destroy_mount_options(struct ceph_mount_options *args)
 439 {
 440         dout("destroy_mount_options %p\n", args);
 441         if (!args)
 442                 return;
 443
 444         kfree(args->snapdir_name);
 445         kfree(args->mds_namespace);
 446         kfree(args->server_path);
 447         kfree(args->fscache_uniq);
 448         kfree(args);
 449 }
 450
 451 static int strcmp_null(const char *s1, const char *s2)
 452 {
 453         if (!s1 && !s2)
 454                 return 0;
 455         if (s1 && !s2)
 456                 return -1;
 457         if (!s1 && s2)
 458                 return 1;
 459         return strcmp(s1, s2);
 460 }
 461
 462 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 463                                  struct ceph_options *new_opt,
 464                                  struct ceph_fs_client *fsc)
 465 {
 466         struct ceph_mount_options *fsopt1 = new_fsopt;
 467         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 468         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 469         int ret;
 470
 471         ret = memcmp(fsopt1, fsopt2, ofs);
 472         if (ret)
 473                 return ret;
 474
 475         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 476         if (ret)
 477                 return ret;
 478         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 479         if (ret)
 480                 return ret;
 481         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 482         if (ret)
 483                 return ret;
 484         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 485         if (ret)
 486                 return ret;
 487
 488         return ceph_compare_options(new_opt, fsc->client);
 489 }
 490
 491 /**
 492  * ceph_show_options - Show mount options in /proc/mounts
 493  * @m: seq_file to write to
 494  * @root: root of that (sub)tree
 495  */
 496 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 497 {
 498         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 499         struct ceph_mount_options *fsopt = fsc->mount_options;
 500         size_t pos;
 501         int ret;
 502
 503         /* a comma between MNT/MS and client options */
 504         seq_putc(m, ',');
 505         pos = m->count;
 506
 507         ret = ceph_print_client_options(m, fsc->client, false);
 508         if (ret)
 509                 return ret;
 510
 511         /* retract our comma if no client options */
 512         if (m->count == pos)
 513                 m->count--;
 514
 515         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 516                 seq_puts(m, ",dirstat");
 517         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 518                 seq_puts(m, ",rbytes");
 519         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 520                 seq_puts(m, ",noasyncreaddir");
 521         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 522                 seq_puts(m, ",nodcache");
 523         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 524                 seq_puts(m, ",ino32");
 525         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 526                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 527         }
 528         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 529                 seq_puts(m, ",nopoolperm");
 530         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 531                 seq_puts(m, ",noquotadf");
 532
 533 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 534         if (root->d_sb->s_flags & SB_POSIXACL)
 535                 seq_puts(m, ",acl");
 536         else
 537                 seq_puts(m, ",noacl");
 538 #endif
 539
 540         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 541                 seq_puts(m, ",copyfrom");
 542
 543         if (fsopt->mds_namespace)
 544                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 545
 546         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 547                 seq_show_option(m, "recover_session", "clean");
 548
 549         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 550                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 551         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 552                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 553         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 554                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 555         if (fsopt->congestion_kb != default_congestion_kb())
 556                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 557         if (fsopt->caps_max)
 558                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 559         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 560                 seq_printf(m, ",caps_wanted_delay_min=%d",
 561                          fsopt->caps_wanted_delay_min);
 562         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 563                 seq_printf(m, ",caps_wanted_delay_max=%d",
 564                            fsopt->caps_wanted_delay_max);
 565         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 566                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 567         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 568                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 569         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 570                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 571
 572         return 0;
 573 }
 574
 575 /*
 576  * handle any mon messages the standard library doesn't understand.
 577  * return error if we don't either.
 578  */
 579 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 580 {
 581         struct ceph_fs_client *fsc = client->private;
 582         int type = le16_to_cpu(msg->hdr.type);
 583
 584         switch (type) {
 585         case CEPH_MSG_MDS_MAP:
 586                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 587                 return 0;
 588         case CEPH_MSG_FS_MAP_USER:
 589                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 590                 return 0;
 591         default:
 592                 return -1;
 593         }
 594 }
 595
 596 /*
 597  * create a new fs client
 598  *
 599  * Success or not, this function consumes @fsopt and @opt.
 600  */
 601 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 602                                         struct ceph_options *opt)
 603 {
 604         struct ceph_fs_client *fsc;
 605         int page_count;
 606         size_t size;
 607         int err;
 608
 609         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 610         if (!fsc) {
 611                 err = -ENOMEM;
 612                 goto fail;
 613         }
 614
 615         fsc->client = ceph_create_client(opt, fsc);
 616         if (IS_ERR(fsc->client)) {
 617                 err = PTR_ERR(fsc->client);
 618                 goto fail;
 619         }
 620         opt = NULL; /* fsc->client now owns this */
 621
 622         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 623         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 624
 625         if (!fsopt->mds_namespace) {
 626                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 627                                    0, true);
 628         } else {
 629                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 630                                    0, false);
 631         }
 632
 633         fsc->mount_options = fsopt;
 634
 635         fsc->sb = NULL;
 636         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 637         fsc->filp_gen = 1;
 638
 639         atomic_long_set(&fsc->writeback_count, 0);
 640
 641         err = -ENOMEM;
 642         /*
 643          * The number of concurrent works can be high but they don't need
 644          * to be processed in parallel, limit concurrency.
 645          */
 646         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 647         if (!fsc->inode_wq)
 648                 goto fail_client;
 649         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 650         if (!fsc->cap_wq)
 651                 goto fail_inode_wq;
 652
 653         /* set up mempools */
 654         err = -ENOMEM;
 655         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 656         size = sizeof (struct page *) * (page_count ? page_count : 1);
 657         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 658         if (!fsc->wb_pagevec_pool)
 659                 goto fail_cap_wq;
 660
 661         return fsc;
 662
 663 fail_cap_wq:
 664         destroy_workqueue(fsc->cap_wq);
 665 fail_inode_wq:
 666         destroy_workqueue(fsc->inode_wq);
 667 fail_client:
 668         ceph_destroy_client(fsc->client);
 669 fail:
 670         kfree(fsc);
 671         if (opt)
 672                 ceph_destroy_options(opt);
 673         destroy_mount_options(fsopt);
 674         return ERR_PTR(err);
 675 }
 676
 677 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 678 {
 679         flush_workqueue(fsc->inode_wq);
 680         flush_workqueue(fsc->cap_wq);
 681 }
 682
 683 static void destroy_fs_client(struct ceph_fs_client *fsc)
 684 {
 685         dout("destroy_fs_client %p\n", fsc);
 686
 687         ceph_mdsc_destroy(fsc);
 688         destroy_workqueue(fsc->inode_wq);
 689         destroy_workqueue(fsc->cap_wq);
 690
 691         mempool_destroy(fsc->wb_pagevec_pool);
 692
 693         destroy_mount_options(fsc->mount_options);
 694
 695         ceph_destroy_client(fsc->client);
 696
 697         kfree(fsc);
 698         dout("destroy_fs_client %p done\n", fsc);
 699 }
 700
 701 /*
 702  * caches
 703  */
 704 struct kmem_cache *ceph_inode_cachep;
 705 struct kmem_cache *ceph_cap_cachep;
 706 struct kmem_cache *ceph_cap_flush_cachep;
 707 struct kmem_cache *ceph_dentry_cachep;
 708 struct kmem_cache *ceph_file_cachep;
 709 struct kmem_cache *ceph_dir_file_cachep;
 710
 711 static void ceph_inode_init_once(void *foo)
 712 {
 713         struct ceph_inode_info *ci = foo;
 714         inode_init_once(&ci->vfs_inode);
 715 }
 716
 717 static int __init init_caches(void)
 718 {
 719         int error = -ENOMEM;
 720
 721         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 722                                       sizeof(struct ceph_inode_info),
 723                                       __alignof__(struct ceph_inode_info),
 724                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 725                                       SLAB_ACCOUNT, ceph_inode_init_once);
 726         if (!ceph_inode_cachep)
 727                 return -ENOMEM;
 728
 729         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 730         if (!ceph_cap_cachep)
 731                 goto bad_cap;
 732         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 733                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 734         if (!ceph_cap_flush_cachep)
 735                 goto bad_cap_flush;
 736
 737         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 738                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 739         if (!ceph_dentry_cachep)
 740                 goto bad_dentry;
 741
 742         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 743         if (!ceph_file_cachep)
 744                 goto bad_file;
 745
 746         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 747         if (!ceph_dir_file_cachep)
 748                 goto bad_dir_file;
 749
 750         error = ceph_fscache_register();
 751         if (error)
 752                 goto bad_fscache;
 753
 754         return 0;
 755
 756 bad_fscache:
 757         kmem_cache_destroy(ceph_dir_file_cachep);
 758 bad_dir_file:
 759         kmem_cache_destroy(ceph_file_cachep);
 760 bad_file:
 761         kmem_cache_destroy(ceph_dentry_cachep);
 762 bad_dentry:
 763         kmem_cache_destroy(ceph_cap_flush_cachep);
 764 bad_cap_flush:
 765         kmem_cache_destroy(ceph_cap_cachep);
 766 bad_cap:
 767         kmem_cache_destroy(ceph_inode_cachep);
 768         return error;
 769 }
 770
 771 static void destroy_caches(void)
 772 {
 773         /*
 774          * Make sure all delayed rcu free inodes are flushed before we
 775          * destroy cache.
 776          */
 777         rcu_barrier();
 778
 779         kmem_cache_destroy(ceph_inode_cachep);
 780         kmem_cache_destroy(ceph_cap_cachep);
 781         kmem_cache_destroy(ceph_cap_flush_cachep);
 782         kmem_cache_destroy(ceph_dentry_cachep);
 783         kmem_cache_destroy(ceph_file_cachep);
 784         kmem_cache_destroy(ceph_dir_file_cachep);
 785
 786         ceph_fscache_unregister();
 787 }
 788
 789
 790 /*
 791  * ceph_umount_begin - initiate forced umount.  Tear down down the
 792  * mount, skipping steps that may hang while waiting for server(s).
 793  */
 794 static void ceph_umount_begin(struct super_block *sb)
 795 {
 796         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 797
 798         dout("ceph_umount_begin - starting forced umount\n");
 799         if (!fsc)
 800                 return;
 801         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 802         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 803         ceph_mdsc_force_umount(fsc->mdsc);
 804         fsc->filp_gen++; // invalidate open files
 805 }
 806
 807 static const struct super_operations ceph_super_ops = {
 808         .alloc_inode    = ceph_alloc_inode,
 809         .free_inode     = ceph_free_inode,
 810         .write_inode    = ceph_write_inode,
 811         .drop_inode     = generic_delete_inode,
 812         .evict_inode    = ceph_evict_inode,
 813         .sync_fs        = ceph_sync_fs,
 814         .put_super      = ceph_put_super,
 815         .show_options   = ceph_show_options,
 816         .statfs         = ceph_statfs,
 817         .umount_begin   = ceph_umount_begin,
 818 };
 819
 820 /*
 821  * Bootstrap mount by opening the root directory.  Note the mount
 822  * @started time from caller, and time out if this takes too long.
 823  */
 824 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 825                                        const char *path,
 826                                        unsigned long started)
 827 {
 828         struct ceph_mds_client *mdsc = fsc->mdsc;
 829         struct ceph_mds_request *req = NULL;
 830         int err;
 831         struct dentry *root;
 832
 833         /* open dir */
 834         dout("open_root_inode opening '%s'\n", path);
 835         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 836         if (IS_ERR(req))
 837                 return ERR_CAST(req);
 838         req->r_path1 = kstrdup(path, GFP_NOFS);
 839         if (!req->r_path1) {
 840                 root = ERR_PTR(-ENOMEM);
 841                 goto out;
 842         }
 843
 844         req->r_ino1.ino = CEPH_INO_ROOT;
 845         req->r_ino1.snap = CEPH_NOSNAP;
 846         req->r_started = started;
 847         req->r_timeout = fsc->client->options->mount_timeout;
 848         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 849         req->r_num_caps = 2;
 850         err = ceph_mdsc_do_request(mdsc, NULL, req);
 851         if (err == 0) {
 852                 struct inode *inode = req->r_target_inode;
 853                 req->r_target_inode = NULL;
 854                 dout("open_root_inode success\n");
 855                 root = d_make_root(inode);
 856                 if (!root) {
 857                         root = ERR_PTR(-ENOMEM);
 858                         goto out;
 859                 }
 860                 dout("open_root_inode success, root dentry is %p\n", root);
 861         } else {
 862                 root = ERR_PTR(err);
 863         }
 864 out:
 865         ceph_mdsc_put_request(req);
 866         return root;
 867 }
 868
 869
 870
 871
 872 /*
 873  * mount: join the ceph cluster, and open root directory.
 874  */
 875 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 876                                       struct fs_context *fc)
 877 {
 878         int err;
 879         unsigned long started = jiffies;  /* note the start time */
 880         struct dentry *root;
 881
 882         dout("mount start %p\n", fsc);
 883         mutex_lock(&fsc->client->mount_mutex);
 884
 885         if (!fsc->sb->s_root) {
 886                 const char *path;
 887                 err = __ceph_open_session(fsc->client, started);
 888                 if (err < 0)
 889                         goto out;
 890
 891                 /* setup fscache */
 892                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 893                         err = ceph_fscache_register_fs(fsc, fc);
 894                         if (err < 0)
 895                                 goto out;
 896                 }
 897
 898                 if (!fsc->mount_options->server_path) {
 899                         path = "";
 900                         dout("mount opening path \\t\n");
 901                 } else {
 902                         path = fsc->mount_options->server_path + 1;
 903                         dout("mount opening path %s\n", path);
 904                 }
 905
 906                 ceph_fs_debugfs_init(fsc);
 907
 908                 root = open_root_dentry(fsc, path, started);
 909                 if (IS_ERR(root)) {
 910                         err = PTR_ERR(root);
 911                         goto out;
 912                 }
 913                 fsc->sb->s_root = dget(root);
 914         } else {
 915                 root = dget(fsc->sb->s_root);
 916         }
 917
 918         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 919         dout("mount success\n");
 920         mutex_unlock(&fsc->client->mount_mutex);
 921         return root;
 922
 923 out:
 924         mutex_unlock(&fsc->client->mount_mutex);
 925         return ERR_PTR(err);
 926 }
 927
 928 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
 929 {
 930         struct ceph_fs_client *fsc = s->s_fs_info;
 931         int ret;
 932
 933         dout("set_super %p\n", s);
 934
 935         s->s_maxbytes = MAX_LFS_FILESIZE;
 936
 937         s->s_xattr = ceph_xattr_handlers;
 938         fsc->sb = s;
 939         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 940
 941         s->s_op = &ceph_super_ops;
 942         s->s_d_op = &ceph_dentry_ops;
 943         s->s_export_op = &ceph_export_ops;
 944
 945         s->s_time_gran = 1;
 946         s->s_time_min = 0;
 947         s->s_time_max = U32_MAX;
 948
 949         ret = set_anon_super_fc(s, fc);
 950         if (ret != 0)
 951                 fsc->sb = NULL;
 952         return ret;
 953 }
 954
 955 /*
 956  * share superblock if same fs AND options
 957  */
 958 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
 959 {
 960         struct ceph_fs_client *new = fc->s_fs_info;
 961         struct ceph_mount_options *fsopt = new->mount_options;
 962         struct ceph_options *opt = new->client->options;
 963         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 964
 965         dout("ceph_compare_super %p\n", sb);
 966
 967         if (compare_mount_options(fsopt, opt, other)) {
 968                 dout("monitor(s)/mount options don't match\n");
 969                 return 0;
 970         }
 971         if ((opt->flags & CEPH_OPT_FSID) &&
 972             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 973                 dout("fsid doesn't match\n");
 974                 return 0;
 975         }
 976         if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
 977                 dout("flags differ\n");
 978                 return 0;
 979         }
 980         return 1;
 981 }
 982
 983 /*
 984  * construct our own bdi so we can control readahead, etc.
 985  */
 986 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 987
 988 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
 989 {
 990         int err;
 991
 992         err = super_setup_bdi_name(sb, "ceph-%ld",
 993                                    atomic_long_inc_return(&bdi_seq));
 994         if (err)
 995                 return err;
 996
 997         /* set ra_pages based on rasize mount option? */
 998         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
 999
1000         /* set io_pages based on max osd read size */
1001         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1002
1003         return 0;
1004 }
1005
1006 static int ceph_get_tree(struct fs_context *fc)
1007 {
1008         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1009         struct super_block *sb;
1010         struct ceph_fs_client *fsc;
1011         struct dentry *res;
1012         int (*compare_super)(struct super_block *, struct fs_context *) =
1013                 ceph_compare_super;
1014         int err;
1015
1016         dout("ceph_get_tree\n");
1017
1018         if (!fc->source)
1019                 return invalf(fc, "ceph: No source");
1020
1021 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1022         fc->sb_flags |= SB_POSIXACL;
1023 #endif
1024
1025         /* create client (which we may/may not use) */
1026         fsc = create_fs_client(pctx->opts, pctx->copts);
1027         pctx->opts = NULL;
1028         pctx->copts = NULL;
1029         if (IS_ERR(fsc)) {
1030                 err = PTR_ERR(fsc);
1031                 goto out_final;
1032         }
1033
1034         err = ceph_mdsc_init(fsc);
1035         if (err < 0)
1036                 goto out;
1037
1038         if (ceph_test_opt(fsc->client, NOSHARE))
1039                 compare_super = NULL;
1040
1041         fc->s_fs_info = fsc;
1042         sb = sget_fc(fc, compare_super, ceph_set_super);
1043         fc->s_fs_info = NULL;
1044         if (IS_ERR(sb)) {
1045                 err = PTR_ERR(sb);
1046                 goto out;
1047         }
1048
1049         if (ceph_sb_to_client(sb) != fsc) {
1050                 destroy_fs_client(fsc);
1051                 fsc = ceph_sb_to_client(sb);
1052                 dout("get_sb got existing client %p\n", fsc);
1053         } else {
1054                 dout("get_sb using new client %p\n", fsc);
1055                 err = ceph_setup_bdi(sb, fsc);
1056                 if (err < 0)
1057                         goto out_splat;
1058         }
1059
1060         res = ceph_real_mount(fsc, fc);
1061         if (IS_ERR(res)) {
1062                 err = PTR_ERR(res);
1063                 goto out_splat;
1064         }
1065         dout("root %p inode %p ino %llx.%llx\n", res,
1066              d_inode(res), ceph_vinop(d_inode(res)));
1067         fc->root = fsc->sb->s_root;
1068         return 0;
1069
1070 out_splat:
1071         ceph_mdsc_close_sessions(fsc->mdsc);
1072         deactivate_locked_super(sb);
1073         goto out_final;
1074
1075 out:
1076         destroy_fs_client(fsc);
1077 out_final:
1078         dout("ceph_get_tree fail %d\n", err);
1079         return err;
1080 }
1081
1082 static void ceph_free_fc(struct fs_context *fc)
1083 {
1084         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1085
1086         if (pctx) {
1087                 destroy_mount_options(pctx->opts);
1088                 ceph_destroy_options(pctx->copts);
1089                 kfree(pctx);
1090         }
1091 }
1092
1093 static int ceph_reconfigure_fc(struct fs_context *fc)
1094 {
1095         sync_filesystem(fc->root->d_sb);
1096         return 0;
1097 }
1098
1099 static const struct fs_context_operations ceph_context_ops = {
1100         .free           = ceph_free_fc,
1101         .parse_param    = ceph_parse_mount_param,
1102         .get_tree       = ceph_get_tree,
1103         .reconfigure    = ceph_reconfigure_fc,
1104 };
1105
1106 /*
1107  * Set up the filesystem mount context.
1108  */
1109 static int ceph_init_fs_context(struct fs_context *fc)
1110 {
1111         struct ceph_parse_opts_ctx *pctx;
1112         struct ceph_mount_options *fsopt;
1113
1114         pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1115         if (!pctx)
1116                 return -ENOMEM;
1117
1118         pctx->copts = ceph_alloc_options();
1119         if (!pctx->copts)
1120                 goto nomem;
1121
1122         pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1123         if (!pctx->opts)
1124                 goto nomem;
1125
1126         fsopt = pctx->opts;
1127         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1128
1129         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1130         fsopt->rsize = CEPH_MAX_READ_SIZE;
1131         fsopt->rasize = CEPH_RASIZE_DEFAULT;
1132         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1133         if (!fsopt->snapdir_name)
1134                 goto nomem;
1135
1136         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1137         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1138         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1139         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1140         fsopt->congestion_kb = default_congestion_kb();
1141
1142         fc->fs_private = pctx;
1143         fc->ops = &ceph_context_ops;
1144         return 0;
1145
1146 nomem:
1147         destroy_mount_options(pctx->opts);
1148         ceph_destroy_options(pctx->copts);
1149         kfree(pctx);
1150         return -ENOMEM;
1151 }
1152
1153 static void ceph_kill_sb(struct super_block *s)
1154 {
1155         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1156         dev_t dev = s->s_dev;
1157
1158         dout("kill_sb %p\n", s);
1159
1160         ceph_mdsc_pre_umount(fsc->mdsc);
1161         flush_fs_workqueues(fsc);
1162
1163         generic_shutdown_super(s);
1164
1165         fsc->client->extra_mon_dispatch = NULL;
1166         ceph_fs_debugfs_cleanup(fsc);
1167
1168         ceph_fscache_unregister_fs(fsc);
1169
1170         destroy_fs_client(fsc);
1171         free_anon_bdev(dev);
1172 }
1173
1174 static struct file_system_type ceph_fs_type = {
1175         .owner          = THIS_MODULE,
1176         .name           = "ceph",
1177         .init_fs_context = ceph_init_fs_context,
1178         .kill_sb        = ceph_kill_sb,
1179         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1180 };
1181 MODULE_ALIAS_FS("ceph");
1182
1183 int ceph_force_reconnect(struct super_block *sb)
1184 {
1185         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1186         int err = 0;
1187
1188         ceph_umount_begin(sb);
1189
1190         /* Make sure all page caches get invalidated.
1191          * see remove_session_caps_cb() */
1192         flush_workqueue(fsc->inode_wq);
1193
1194         /* In case that we were blacklisted. This also reset
1195          * all mon/osd connections */
1196         ceph_reset_client_addr(fsc->client);
1197
1198         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1199
1200         fsc->blacklisted = false;
1201         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1202
1203         if (sb->s_root) {
1204                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1205                                         CEPH_STAT_CAP_INODE, true);
1206         }
1207         return err;
1208 }
1209
1210 static int __init init_ceph(void)
1211 {
1212         int ret = init_caches();
1213         if (ret)
1214                 goto out;
1215
1216         ceph_flock_init();
1217         ret = register_filesystem(&ceph_fs_type);
1218         if (ret)
1219                 goto out_caches;
1220
1221         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1222
1223         return 0;
1224
1225 out_caches:
1226         destroy_caches();
1227 out:
1228         return ret;
1229 }
1230
1231 static void __exit exit_ceph(void)
1232 {
1233         dout("exit_ceph\n");
1234         unregister_filesystem(&ceph_fs_type);
1235         destroy_caches();
1236 }
1237
1238 module_init(init_ceph);
1239 module_exit(exit_ceph);
1240
1241 MODULE_AUTHOR("Sage Weil <[email protected]>");
1242 MODULE_AUTHOR("Yehuda Sadeh <[email protected]>");
1243 MODULE_AUTHOR("Patience Warnick <[email protected]>");
1244 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1245 MODULE_LICENSE("GPL");