fs/ceph/super.c

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