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/parser.h>
  13 #include <linux/sched.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/slab.h>
  16 #include <linux/statfs.h>
  17 #include <linux/string.h>
  18
  19 #include "super.h"
  20 #include "mds_client.h"
  21 #include "cache.h"
  22
  23 #include <linux/ceph/ceph_features.h>
  24 #include <linux/ceph/decode.h>
  25 #include <linux/ceph/mon_client.h>
  26 #include <linux/ceph/auth.h>
  27 #include <linux/ceph/debugfs.h>
  28
  29 /*
  30  * Ceph superblock operations
  31  *
  32  * Handle the basics of mounting, unmounting.
  33  */
  34
  35 /*
  36  * super ops
  37  */
  38 static void ceph_put_super(struct super_block *s)
  39 {
  40         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  41
  42         dout("put_super\n");
  43         ceph_mdsc_close_sessions(fsc->mdsc);
  44 }
  45
  46 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  47 {
  48         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  49         struct ceph_mon_client *monc = &fsc->client->monc;
  50         struct ceph_statfs st;
  51         u64 fsid;
  52         int err;
  53         u64 data_pool;
  54
  55         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  56                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  57         } else {
  58                 data_pool = CEPH_NOPOOL;
  59         }
  60
  61         dout("statfs\n");
  62         err = ceph_monc_do_statfs(monc, data_pool, &st);
  63         if (err < 0)
  64                 return err;
  65
  66         /* fill in kstatfs */
  67         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  68
  69         /*
  70          * express utilization in terms of large blocks to avoid
  71          * overflow on 32-bit machines.
  72          *
  73          * NOTE: for the time being, we make bsize == frsize to humor
  74          * not-yet-ancient versions of glibc that are broken.
  75          * Someday, we will probably want to report a real block
  76          * size...  whatever that may mean for a network file system!
  77          */
  78         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  79         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  80
  81         /*
  82          * By default use root quota for stats; fallback to overall filesystem
  83          * usage if using 'noquotadf' mount option or if the root dir doesn't
  84          * have max_bytes quota set.
  85          */
  86         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  87             !ceph_quota_update_statfs(fsc, buf)) {
  88                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  89                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  90                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  91         }
  92
  93         buf->f_files = le64_to_cpu(st.num_objects);
  94         buf->f_ffree = -1;
  95         buf->f_namelen = NAME_MAX;
  96
  97         /* Must convert the fsid, for consistent values across arches */
  98         mutex_lock(&monc->mutex);
  99         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
 100                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 101         mutex_unlock(&monc->mutex);
 102
 103         buf->f_fsid.val[0] = fsid & 0xffffffff;
 104         buf->f_fsid.val[1] = fsid >> 32;
 105
 106         return 0;
 107 }
 108
 109
 110 static int ceph_sync_fs(struct super_block *sb, int wait)
 111 {
 112         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 113
 114         if (!wait) {
 115                 dout("sync_fs (non-blocking)\n");
 116                 ceph_flush_dirty_caps(fsc->mdsc);
 117                 dout("sync_fs (non-blocking) done\n");
 118                 return 0;
 119         }
 120
 121         dout("sync_fs (blocking)\n");
 122         ceph_osdc_sync(&fsc->client->osdc);
 123         ceph_mdsc_sync(fsc->mdsc);
 124         dout("sync_fs (blocking) done\n");
 125         return 0;
 126 }
 127
 128 /*
 129  * mount options
 130  */
 131 enum {
 132         Opt_wsize,
 133         Opt_rsize,
 134         Opt_rasize,
 135         Opt_caps_wanted_delay_min,
 136         Opt_caps_wanted_delay_max,
 137         Opt_caps_max,
 138         Opt_readdir_max_entries,
 139         Opt_readdir_max_bytes,
 140         Opt_congestion_kb,
 141         Opt_last_int,
 142         /* int args above */
 143         Opt_snapdirname,
 144         Opt_mds_namespace,
 145         Opt_fscache_uniq,
 146         Opt_recover_session,
 147         Opt_last_string,
 148         /* string args above */
 149         Opt_dirstat,
 150         Opt_nodirstat,
 151         Opt_rbytes,
 152         Opt_norbytes,
 153         Opt_asyncreaddir,
 154         Opt_noasyncreaddir,
 155         Opt_dcache,
 156         Opt_nodcache,
 157         Opt_ino32,
 158         Opt_noino32,
 159         Opt_fscache,
 160         Opt_nofscache,
 161         Opt_poolperm,
 162         Opt_nopoolperm,
 163         Opt_require_active_mds,
 164         Opt_norequire_active_mds,
 165 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 166         Opt_acl,
 167 #endif
 168         Opt_noacl,
 169         Opt_quotadf,
 170         Opt_noquotadf,
 171         Opt_copyfrom,
 172         Opt_nocopyfrom,
 173 };
 174
 175 static match_table_t fsopt_tokens = {
 176         {Opt_wsize, "wsize=%d"},
 177         {Opt_rsize, "rsize=%d"},
 178         {Opt_rasize, "rasize=%d"},
 179         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 180         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 181         {Opt_caps_max, "caps_max=%d"},
 182         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 183         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 184         {Opt_congestion_kb, "write_congestion_kb=%d"},
 185         /* int args above */
 186         {Opt_snapdirname, "snapdirname=%s"},
 187         {Opt_mds_namespace, "mds_namespace=%s"},
 188         {Opt_recover_session, "recover_session=%s"},
 189         {Opt_fscache_uniq, "fsc=%s"},
 190         /* string args above */
 191         {Opt_dirstat, "dirstat"},
 192         {Opt_nodirstat, "nodirstat"},
 193         {Opt_rbytes, "rbytes"},
 194         {Opt_norbytes, "norbytes"},
 195         {Opt_asyncreaddir, "asyncreaddir"},
 196         {Opt_noasyncreaddir, "noasyncreaddir"},
 197         {Opt_dcache, "dcache"},
 198         {Opt_nodcache, "nodcache"},
 199         {Opt_ino32, "ino32"},
 200         {Opt_noino32, "noino32"},
 201         {Opt_fscache, "fsc"},
 202         {Opt_nofscache, "nofsc"},
 203         {Opt_poolperm, "poolperm"},
 204         {Opt_nopoolperm, "nopoolperm"},
 205         {Opt_require_active_mds, "require_active_mds"},
 206         {Opt_norequire_active_mds, "norequire_active_mds"},
 207 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 208         {Opt_acl, "acl"},
 209 #endif
 210         {Opt_noacl, "noacl"},
 211         {Opt_quotadf, "quotadf"},
 212         {Opt_noquotadf, "noquotadf"},
 213         {Opt_copyfrom, "copyfrom"},
 214         {Opt_nocopyfrom, "nocopyfrom"},
 215         {-1, NULL}
 216 };
 217
 218 static int parse_fsopt_token(char *c, void *private)
 219 {
 220         struct ceph_mount_options *fsopt = private;
 221         substring_t argstr[MAX_OPT_ARGS];
 222         int token, intval, ret;
 223
 224         token = match_token((char *)c, fsopt_tokens, argstr);
 225         if (token < 0)
 226                 return -EINVAL;
 227
 228         if (token < Opt_last_int) {
 229                 ret = match_int(&argstr[0], &intval);
 230                 if (ret < 0) {
 231                         pr_err("bad option arg (not int) at '%s'\n", c);
 232                         return ret;
 233                 }
 234                 dout("got int token %d val %d\n", token, intval);
 235         } else if (token > Opt_last_int && token < Opt_last_string) {
 236                 dout("got string token %d val %s\n", token,
 237                      argstr[0].from);
 238         } else {
 239                 dout("got token %d\n", token);
 240         }
 241
 242         switch (token) {
 243         case Opt_snapdirname:
 244                 kfree(fsopt->snapdir_name);
 245                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 246                                                argstr[0].to-argstr[0].from,
 247                                                GFP_KERNEL);
 248                 if (!fsopt->snapdir_name)
 249                         return -ENOMEM;
 250                 break;
 251         case Opt_mds_namespace:
 252                 kfree(fsopt->mds_namespace);
 253                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 254                                                 argstr[0].to-argstr[0].from,
 255                                                 GFP_KERNEL);
 256                 if (!fsopt->mds_namespace)
 257                         return -ENOMEM;
 258                 break;
 259         case Opt_recover_session:
 260                 if (!strncmp(argstr[0].from, "no",
 261                              argstr[0].to - argstr[0].from)) {
 262                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 263                 } else if (!strncmp(argstr[0].from, "clean",
 264                                     argstr[0].to - argstr[0].from)) {
 265                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 266                 } else {
 267                         return -EINVAL;
 268                 }
 269                 break;
 270         case Opt_fscache_uniq:
 271 #ifdef CONFIG_CEPH_FSCACHE
 272                 kfree(fsopt->fscache_uniq);
 273                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 274                                                argstr[0].to-argstr[0].from,
 275                                                GFP_KERNEL);
 276                 if (!fsopt->fscache_uniq)
 277                         return -ENOMEM;
 278                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 279                 break;
 280 #else
 281                 pr_err("fscache support is disabled\n");
 282                 return -EINVAL;
 283 #endif
 284         case Opt_wsize:
 285                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 286                         return -EINVAL;
 287                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 288                 break;
 289         case Opt_rsize:
 290                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 291                         return -EINVAL;
 292                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 293                 break;
 294         case Opt_rasize:
 295                 if (intval < 0)
 296                         return -EINVAL;
 297                 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
 298                 break;
 299         case Opt_caps_wanted_delay_min:
 300                 if (intval < 1)
 301                         return -EINVAL;
 302                 fsopt->caps_wanted_delay_min = intval;
 303                 break;
 304         case Opt_caps_wanted_delay_max:
 305                 if (intval < 1)
 306                         return -EINVAL;
 307                 fsopt->caps_wanted_delay_max = intval;
 308                 break;
 309         case Opt_caps_max:
 310                 if (intval < 0)
 311                         return -EINVAL;
 312                 fsopt->caps_max = intval;
 313                 break;
 314         case Opt_readdir_max_entries:
 315                 if (intval < 1)
 316                         return -EINVAL;
 317                 fsopt->max_readdir = intval;
 318                 break;
 319         case Opt_readdir_max_bytes:
 320                 if (intval < (int)PAGE_SIZE && intval != 0)
 321                         return -EINVAL;
 322                 fsopt->max_readdir_bytes = intval;
 323                 break;
 324         case Opt_congestion_kb:
 325                 if (intval < 1024) /* at least 1M */
 326                         return -EINVAL;
 327                 fsopt->congestion_kb = intval;
 328                 break;
 329         case Opt_dirstat:
 330                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 331                 break;
 332         case Opt_nodirstat:
 333                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 334                 break;
 335         case Opt_rbytes:
 336                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 337                 break;
 338         case Opt_norbytes:
 339                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 340                 break;
 341         case Opt_asyncreaddir:
 342                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 343                 break;
 344         case Opt_noasyncreaddir:
 345                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 346                 break;
 347         case Opt_dcache:
 348                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 349                 break;
 350         case Opt_nodcache:
 351                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 352                 break;
 353         case Opt_ino32:
 354                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 355                 break;
 356         case Opt_noino32:
 357                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 358                 break;
 359         case Opt_fscache:
 360 #ifdef CONFIG_CEPH_FSCACHE
 361                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 362                 kfree(fsopt->fscache_uniq);
 363                 fsopt->fscache_uniq = NULL;
 364                 break;
 365 #else
 366                 pr_err("fscache support is disabled\n");
 367                 return -EINVAL;
 368 #endif
 369         case Opt_nofscache:
 370                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 371                 kfree(fsopt->fscache_uniq);
 372                 fsopt->fscache_uniq = NULL;
 373                 break;
 374         case Opt_poolperm:
 375                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 376                 break;
 377         case Opt_nopoolperm:
 378                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 379                 break;
 380         case Opt_require_active_mds:
 381                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 382                 break;
 383         case Opt_norequire_active_mds:
 384                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 385                 break;
 386         case Opt_quotadf:
 387                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 388                 break;
 389         case Opt_noquotadf:
 390                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 391                 break;
 392         case Opt_copyfrom:
 393                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 394                 break;
 395         case Opt_nocopyfrom:
 396                 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 397                 break;
 398 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 399         case Opt_acl:
 400                 fsopt->sb_flags |= SB_POSIXACL;
 401                 break;
 402 #endif
 403         case Opt_noacl:
 404                 fsopt->sb_flags &= ~SB_POSIXACL;
 405                 break;
 406         default:
 407                 BUG_ON(token);
 408         }
 409         return 0;
 410 }
 411
 412 static void destroy_mount_options(struct ceph_mount_options *args)
 413 {
 414         dout("destroy_mount_options %p\n", args);
 415         kfree(args->snapdir_name);
 416         kfree(args->mds_namespace);
 417         kfree(args->server_path);
 418         kfree(args->fscache_uniq);
 419         kfree(args);
 420 }
 421
 422 static int strcmp_null(const char *s1, const char *s2)
 423 {
 424         if (!s1 && !s2)
 425                 return 0;
 426         if (s1 && !s2)
 427                 return -1;
 428         if (!s1 && s2)
 429                 return 1;
 430         return strcmp(s1, s2);
 431 }
 432
 433 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 434                                  struct ceph_options *new_opt,
 435                                  struct ceph_fs_client *fsc)
 436 {
 437         struct ceph_mount_options *fsopt1 = new_fsopt;
 438         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 439         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 440         int ret;
 441
 442         ret = memcmp(fsopt1, fsopt2, ofs);
 443         if (ret)
 444                 return ret;
 445
 446         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 447         if (ret)
 448                 return ret;
 449         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 450         if (ret)
 451                 return ret;
 452         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 453         if (ret)
 454                 return ret;
 455         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 456         if (ret)
 457                 return ret;
 458
 459         return ceph_compare_options(new_opt, fsc->client);
 460 }
 461
 462 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 463                                struct ceph_options **popt,
 464                                int flags, char *options,
 465                                const char *dev_name)
 466 {
 467         struct ceph_mount_options *fsopt;
 468         const char *dev_name_end;
 469         int err;
 470
 471         if (!dev_name || !*dev_name)
 472                 return -EINVAL;
 473
 474         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 475         if (!fsopt)
 476                 return -ENOMEM;
 477
 478         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 479
 480         fsopt->sb_flags = flags;
 481         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 482
 483         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 484         fsopt->rsize = CEPH_MAX_READ_SIZE;
 485         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 486         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 487         if (!fsopt->snapdir_name) {
 488                 err = -ENOMEM;
 489                 goto out;
 490         }
 491
 492         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 493         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 494         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 495         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 496         fsopt->congestion_kb = default_congestion_kb();
 497
 498         /*
 499          * Distinguish the server list from the path in "dev_name".
 500          * Internally we do not include the leading '/' in the path.
 501          *
 502          * "dev_name" will look like:
 503          *     <server_spec>[,<server_spec>...]:[<path>]
 504          * where
 505          *     <server_spec> is <ip>[:<port>]
 506          *     <path> is optional, but if present must begin with '/'
 507          */
 508         dev_name_end = strchr(dev_name, '/');
 509         if (dev_name_end) {
 510                 if (strlen(dev_name_end) > 1) {
 511                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 512                         if (!fsopt->server_path) {
 513                                 err = -ENOMEM;
 514                                 goto out;
 515                         }
 516                 }
 517         } else {
 518                 dev_name_end = dev_name + strlen(dev_name);
 519         }
 520         err = -EINVAL;
 521         dev_name_end--;         /* back up to ':' separator */
 522         if (dev_name_end < dev_name || *dev_name_end != ':') {
 523                 pr_err("device name is missing path (no : separator in %s)\n",
 524                                 dev_name);
 525                 goto out;
 526         }
 527         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 528         if (fsopt->server_path)
 529                 dout("server path '%s'\n", fsopt->server_path);
 530
 531         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 532                                  parse_fsopt_token, (void *)fsopt);
 533         if (IS_ERR(*popt)) {
 534                 err = PTR_ERR(*popt);
 535                 goto out;
 536         }
 537
 538         /* success */
 539         *pfsopt = fsopt;
 540         return 0;
 541
 542 out:
 543         destroy_mount_options(fsopt);
 544         return err;
 545 }
 546
 547 /**
 548  * ceph_show_options - Show mount options in /proc/mounts
 549  * @m: seq_file to write to
 550  * @root: root of that (sub)tree
 551  */
 552 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 553 {
 554         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 555         struct ceph_mount_options *fsopt = fsc->mount_options;
 556         size_t pos;
 557         int ret;
 558
 559         /* a comma between MNT/MS and client options */
 560         seq_putc(m, ',');
 561         pos = m->count;
 562
 563         ret = ceph_print_client_options(m, fsc->client, false);
 564         if (ret)
 565                 return ret;
 566
 567         /* retract our comma if no client options */
 568         if (m->count == pos)
 569                 m->count--;
 570
 571         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 572                 seq_puts(m, ",dirstat");
 573         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 574                 seq_puts(m, ",rbytes");
 575         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 576                 seq_puts(m, ",noasyncreaddir");
 577         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 578                 seq_puts(m, ",nodcache");
 579         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 580                 seq_puts(m, ",ino32");
 581         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 582                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 583         }
 584         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 585                 seq_puts(m, ",nopoolperm");
 586         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 587                 seq_puts(m, ",noquotadf");
 588
 589 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 590         if (fsopt->sb_flags & SB_POSIXACL)
 591                 seq_puts(m, ",acl");
 592         else
 593                 seq_puts(m, ",noacl");
 594 #endif
 595
 596         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 597                 seq_puts(m, ",copyfrom");
 598
 599         if (fsopt->mds_namespace)
 600                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 601
 602         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 603                 seq_show_option(m, "recover_session", "clean");
 604
 605         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 606                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 607         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 608                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 609         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 610                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 611         if (fsopt->congestion_kb != default_congestion_kb())
 612                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 613         if (fsopt->caps_max)
 614                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 615         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 616                 seq_printf(m, ",caps_wanted_delay_min=%d",
 617                          fsopt->caps_wanted_delay_min);
 618         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 619                 seq_printf(m, ",caps_wanted_delay_max=%d",
 620                            fsopt->caps_wanted_delay_max);
 621         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 622                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 623         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 624                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 625         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 626                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 627
 628         return 0;
 629 }
 630
 631 /*
 632  * handle any mon messages the standard library doesn't understand.
 633  * return error if we don't either.
 634  */
 635 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 636 {
 637         struct ceph_fs_client *fsc = client->private;
 638         int type = le16_to_cpu(msg->hdr.type);
 639
 640         switch (type) {
 641         case CEPH_MSG_MDS_MAP:
 642                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 643                 return 0;
 644         case CEPH_MSG_FS_MAP_USER:
 645                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 646                 return 0;
 647         default:
 648                 return -1;
 649         }
 650 }
 651
 652 /*
 653  * create a new fs client
 654  *
 655  * Success or not, this function consumes @fsopt and @opt.
 656  */
 657 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 658                                         struct ceph_options *opt)
 659 {
 660         struct ceph_fs_client *fsc;
 661         int page_count;
 662         size_t size;
 663         int err;
 664
 665         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 666         if (!fsc) {
 667                 err = -ENOMEM;
 668                 goto fail;
 669         }
 670
 671         fsc->client = ceph_create_client(opt, fsc);
 672         if (IS_ERR(fsc->client)) {
 673                 err = PTR_ERR(fsc->client);
 674                 goto fail;
 675         }
 676         opt = NULL; /* fsc->client now owns this */
 677
 678         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 679         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 680
 681         if (!fsopt->mds_namespace) {
 682                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 683                                    0, true);
 684         } else {
 685                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 686                                    0, false);
 687         }
 688
 689         fsc->mount_options = fsopt;
 690
 691         fsc->sb = NULL;
 692         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 693         fsc->filp_gen = 1;
 694
 695         atomic_long_set(&fsc->writeback_count, 0);
 696
 697         err = -ENOMEM;
 698         /*
 699          * The number of concurrent works can be high but they don't need
 700          * to be processed in parallel, limit concurrency.
 701          */
 702         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 703         if (!fsc->inode_wq)
 704                 goto fail_client;
 705         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 706         if (!fsc->cap_wq)
 707                 goto fail_inode_wq;
 708
 709         /* set up mempools */
 710         err = -ENOMEM;
 711         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 712         size = sizeof (struct page *) * (page_count ? page_count : 1);
 713         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 714         if (!fsc->wb_pagevec_pool)
 715                 goto fail_cap_wq;
 716
 717         return fsc;
 718
 719 fail_cap_wq:
 720         destroy_workqueue(fsc->cap_wq);
 721 fail_inode_wq:
 722         destroy_workqueue(fsc->inode_wq);
 723 fail_client:
 724         ceph_destroy_client(fsc->client);
 725 fail:
 726         kfree(fsc);
 727         if (opt)
 728                 ceph_destroy_options(opt);
 729         destroy_mount_options(fsopt);
 730         return ERR_PTR(err);
 731 }
 732
 733 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 734 {
 735         flush_workqueue(fsc->inode_wq);
 736         flush_workqueue(fsc->cap_wq);
 737 }
 738
 739 static void destroy_fs_client(struct ceph_fs_client *fsc)
 740 {
 741         dout("destroy_fs_client %p\n", fsc);
 742
 743         ceph_mdsc_destroy(fsc);
 744         destroy_workqueue(fsc->inode_wq);
 745         destroy_workqueue(fsc->cap_wq);
 746
 747         mempool_destroy(fsc->wb_pagevec_pool);
 748
 749         destroy_mount_options(fsc->mount_options);
 750
 751         ceph_destroy_client(fsc->client);
 752
 753         kfree(fsc);
 754         dout("destroy_fs_client %p done\n", fsc);
 755 }
 756
 757 /*
 758  * caches
 759  */
 760 struct kmem_cache *ceph_inode_cachep;
 761 struct kmem_cache *ceph_cap_cachep;
 762 struct kmem_cache *ceph_cap_flush_cachep;
 763 struct kmem_cache *ceph_dentry_cachep;
 764 struct kmem_cache *ceph_file_cachep;
 765 struct kmem_cache *ceph_dir_file_cachep;
 766
 767 static void ceph_inode_init_once(void *foo)
 768 {
 769         struct ceph_inode_info *ci = foo;
 770         inode_init_once(&ci->vfs_inode);
 771 }
 772
 773 static int __init init_caches(void)
 774 {
 775         int error = -ENOMEM;
 776
 777         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 778                                       sizeof(struct ceph_inode_info),
 779                                       __alignof__(struct ceph_inode_info),
 780                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 781                                       SLAB_ACCOUNT, ceph_inode_init_once);
 782         if (!ceph_inode_cachep)
 783                 return -ENOMEM;
 784
 785         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 786         if (!ceph_cap_cachep)
 787                 goto bad_cap;
 788         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 789                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 790         if (!ceph_cap_flush_cachep)
 791                 goto bad_cap_flush;
 792
 793         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 794                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 795         if (!ceph_dentry_cachep)
 796                 goto bad_dentry;
 797
 798         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 799         if (!ceph_file_cachep)
 800                 goto bad_file;
 801
 802         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 803         if (!ceph_dir_file_cachep)
 804                 goto bad_dir_file;
 805
 806         error = ceph_fscache_register();
 807         if (error)
 808                 goto bad_fscache;
 809
 810         return 0;
 811
 812 bad_fscache:
 813         kmem_cache_destroy(ceph_dir_file_cachep);
 814 bad_dir_file:
 815         kmem_cache_destroy(ceph_file_cachep);
 816 bad_file:
 817         kmem_cache_destroy(ceph_dentry_cachep);
 818 bad_dentry:
 819         kmem_cache_destroy(ceph_cap_flush_cachep);
 820 bad_cap_flush:
 821         kmem_cache_destroy(ceph_cap_cachep);
 822 bad_cap:
 823         kmem_cache_destroy(ceph_inode_cachep);
 824         return error;
 825 }
 826
 827 static void destroy_caches(void)
 828 {
 829         /*
 830          * Make sure all delayed rcu free inodes are flushed before we
 831          * destroy cache.
 832          */
 833         rcu_barrier();
 834
 835         kmem_cache_destroy(ceph_inode_cachep);
 836         kmem_cache_destroy(ceph_cap_cachep);
 837         kmem_cache_destroy(ceph_cap_flush_cachep);
 838         kmem_cache_destroy(ceph_dentry_cachep);
 839         kmem_cache_destroy(ceph_file_cachep);
 840         kmem_cache_destroy(ceph_dir_file_cachep);
 841
 842         ceph_fscache_unregister();
 843 }
 844
 845
 846 /*
 847  * ceph_umount_begin - initiate forced umount.  Tear down down the
 848  * mount, skipping steps that may hang while waiting for server(s).
 849  */
 850 static void ceph_umount_begin(struct super_block *sb)
 851 {
 852         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 853
 854         dout("ceph_umount_begin - starting forced umount\n");
 855         if (!fsc)
 856                 return;
 857         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 858         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 859         ceph_mdsc_force_umount(fsc->mdsc);
 860         fsc->filp_gen++; // invalidate open files
 861 }
 862
 863 static int ceph_remount(struct super_block *sb, int *flags, char *data)
 864 {
 865         sync_filesystem(sb);
 866         return 0;
 867 }
 868
 869 static const struct super_operations ceph_super_ops = {
 870         .alloc_inode    = ceph_alloc_inode,
 871         .free_inode     = ceph_free_inode,
 872         .write_inode    = ceph_write_inode,
 873         .drop_inode     = generic_delete_inode,
 874         .evict_inode    = ceph_evict_inode,
 875         .sync_fs        = ceph_sync_fs,
 876         .put_super      = ceph_put_super,
 877         .remount_fs     = ceph_remount,
 878         .show_options   = ceph_show_options,
 879         .statfs         = ceph_statfs,
 880         .umount_begin   = ceph_umount_begin,
 881 };
 882
 883 /*
 884  * Bootstrap mount by opening the root directory.  Note the mount
 885  * @started time from caller, and time out if this takes too long.
 886  */
 887 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 888                                        const char *path,
 889                                        unsigned long started)
 890 {
 891         struct ceph_mds_client *mdsc = fsc->mdsc;
 892         struct ceph_mds_request *req = NULL;
 893         int err;
 894         struct dentry *root;
 895
 896         /* open dir */
 897         dout("open_root_inode opening '%s'\n", path);
 898         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 899         if (IS_ERR(req))
 900                 return ERR_CAST(req);
 901         req->r_path1 = kstrdup(path, GFP_NOFS);
 902         if (!req->r_path1) {
 903                 root = ERR_PTR(-ENOMEM);
 904                 goto out;
 905         }
 906
 907         req->r_ino1.ino = CEPH_INO_ROOT;
 908         req->r_ino1.snap = CEPH_NOSNAP;
 909         req->r_started = started;
 910         req->r_timeout = fsc->client->options->mount_timeout;
 911         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 912         req->r_num_caps = 2;
 913         err = ceph_mdsc_do_request(mdsc, NULL, req);
 914         if (err == 0) {
 915                 struct inode *inode = req->r_target_inode;
 916                 req->r_target_inode = NULL;
 917                 dout("open_root_inode success\n");
 918                 root = d_make_root(inode);
 919                 if (!root) {
 920                         root = ERR_PTR(-ENOMEM);
 921                         goto out;
 922                 }
 923                 dout("open_root_inode success, root dentry is %p\n", root);
 924         } else {
 925                 root = ERR_PTR(err);
 926         }
 927 out:
 928         ceph_mdsc_put_request(req);
 929         return root;
 930 }
 931
 932
 933
 934
 935 /*
 936  * mount: join the ceph cluster, and open root directory.
 937  */
 938 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 939 {
 940         int err;
 941         unsigned long started = jiffies;  /* note the start time */
 942         struct dentry *root;
 943
 944         dout("mount start %p\n", fsc);
 945         mutex_lock(&fsc->client->mount_mutex);
 946
 947         if (!fsc->sb->s_root) {
 948                 const char *path;
 949                 err = __ceph_open_session(fsc->client, started);
 950                 if (err < 0)
 951                         goto out;
 952
 953                 /* setup fscache */
 954                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 955                         err = ceph_fscache_register_fs(fsc);
 956                         if (err < 0)
 957                                 goto out;
 958                 }
 959
 960                 if (!fsc->mount_options->server_path) {
 961                         path = "";
 962                         dout("mount opening path \\t\n");
 963                 } else {
 964                         path = fsc->mount_options->server_path + 1;
 965                         dout("mount opening path %s\n", path);
 966                 }
 967
 968                 ceph_fs_debugfs_init(fsc);
 969
 970                 root = open_root_dentry(fsc, path, started);
 971                 if (IS_ERR(root)) {
 972                         err = PTR_ERR(root);
 973                         goto out;
 974                 }
 975                 fsc->sb->s_root = dget(root);
 976         } else {
 977                 root = dget(fsc->sb->s_root);
 978         }
 979
 980         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 981         dout("mount success\n");
 982         mutex_unlock(&fsc->client->mount_mutex);
 983         return root;
 984
 985 out:
 986         mutex_unlock(&fsc->client->mount_mutex);
 987         return ERR_PTR(err);
 988 }
 989
 990 static int ceph_set_super(struct super_block *s, void *data)
 991 {
 992         struct ceph_fs_client *fsc = data;
 993         int ret;
 994
 995         dout("set_super %p data %p\n", s, data);
 996
 997         s->s_flags = fsc->mount_options->sb_flags;
 998         s->s_maxbytes = MAX_LFS_FILESIZE;
 999
1000         s->s_xattr = ceph_xattr_handlers;
1001         s->s_fs_info = fsc;
1002         fsc->sb = s;
1003         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1004
1005         s->s_op = &ceph_super_ops;
1006         s->s_d_op = &ceph_dentry_ops;
1007         s->s_export_op = &ceph_export_ops;
1008
1009         s->s_time_gran = 1;
1010         s->s_time_min = 0;
1011         s->s_time_max = U32_MAX;
1012
1013         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
1014         if (ret != 0)
1015                 goto fail;
1016
1017         return ret;
1018
1019 fail:
1020         s->s_fs_info = NULL;
1021         fsc->sb = NULL;
1022         return ret;
1023 }
1024
1025 /*
1026  * share superblock if same fs AND options
1027  */
1028 static int ceph_compare_super(struct super_block *sb, void *data)
1029 {
1030         struct ceph_fs_client *new = data;
1031         struct ceph_mount_options *fsopt = new->mount_options;
1032         struct ceph_options *opt = new->client->options;
1033         struct ceph_fs_client *other = ceph_sb_to_client(sb);
1034
1035         dout("ceph_compare_super %p\n", sb);
1036
1037         if (compare_mount_options(fsopt, opt, other)) {
1038                 dout("monitor(s)/mount options don't match\n");
1039                 return 0;
1040         }
1041         if ((opt->flags & CEPH_OPT_FSID) &&
1042             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1043                 dout("fsid doesn't match\n");
1044                 return 0;
1045         }
1046         if (fsopt->sb_flags != other->mount_options->sb_flags) {
1047                 dout("flags differ\n");
1048                 return 0;
1049         }
1050         return 1;
1051 }
1052
1053 /*
1054  * construct our own bdi so we can control readahead, etc.
1055  */
1056 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1057
1058 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1059 {
1060         int err;
1061
1062         err = super_setup_bdi_name(sb, "ceph-%ld",
1063                                    atomic_long_inc_return(&bdi_seq));
1064         if (err)
1065                 return err;
1066
1067         /* set ra_pages based on rasize mount option? */
1068         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1069
1070         /* set io_pages based on max osd read size */
1071         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1072
1073         return 0;
1074 }
1075
1076 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1077                        int flags, const char *dev_name, void *data)
1078 {
1079         struct super_block *sb;
1080         struct ceph_fs_client *fsc;
1081         struct dentry *res;
1082         int err;
1083         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1084         struct ceph_mount_options *fsopt = NULL;
1085         struct ceph_options *opt = NULL;
1086
1087         dout("ceph_mount\n");
1088
1089 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1090         flags |= SB_POSIXACL;
1091 #endif
1092         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1093         if (err < 0) {
1094                 res = ERR_PTR(err);
1095                 goto out_final;
1096         }
1097
1098         /* create client (which we may/may not use) */
1099         fsc = create_fs_client(fsopt, opt);
1100         if (IS_ERR(fsc)) {
1101                 res = ERR_CAST(fsc);
1102                 goto out_final;
1103         }
1104
1105         err = ceph_mdsc_init(fsc);
1106         if (err < 0) {
1107                 res = ERR_PTR(err);
1108                 goto out;
1109         }
1110
1111         if (ceph_test_opt(fsc->client, NOSHARE))
1112                 compare_super = NULL;
1113         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1114         if (IS_ERR(sb)) {
1115                 res = ERR_CAST(sb);
1116                 goto out;
1117         }
1118
1119         if (ceph_sb_to_client(sb) != fsc) {
1120                 destroy_fs_client(fsc);
1121                 fsc = ceph_sb_to_client(sb);
1122                 dout("get_sb got existing client %p\n", fsc);
1123         } else {
1124                 dout("get_sb using new client %p\n", fsc);
1125                 err = ceph_setup_bdi(sb, fsc);
1126                 if (err < 0) {
1127                         res = ERR_PTR(err);
1128                         goto out_splat;
1129                 }
1130         }
1131
1132         res = ceph_real_mount(fsc);
1133         if (IS_ERR(res))
1134                 goto out_splat;
1135         dout("root %p inode %p ino %llx.%llx\n", res,
1136              d_inode(res), ceph_vinop(d_inode(res)));
1137         return res;
1138
1139 out_splat:
1140         ceph_mdsc_close_sessions(fsc->mdsc);
1141         deactivate_locked_super(sb);
1142         goto out_final;
1143
1144 out:
1145         destroy_fs_client(fsc);
1146 out_final:
1147         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1148         return res;
1149 }
1150
1151 static void ceph_kill_sb(struct super_block *s)
1152 {
1153         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1154         dev_t dev = s->s_dev;
1155
1156         dout("kill_sb %p\n", s);
1157
1158         ceph_mdsc_pre_umount(fsc->mdsc);
1159         flush_fs_workqueues(fsc);
1160
1161         generic_shutdown_super(s);
1162
1163         fsc->client->extra_mon_dispatch = NULL;
1164         ceph_fs_debugfs_cleanup(fsc);
1165
1166         ceph_fscache_unregister_fs(fsc);
1167
1168         destroy_fs_client(fsc);
1169         free_anon_bdev(dev);
1170 }
1171
1172 static struct file_system_type ceph_fs_type = {
1173         .owner          = THIS_MODULE,
1174         .name           = "ceph",
1175         .mount          = ceph_mount,
1176         .kill_sb        = ceph_kill_sb,
1177         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1178 };
1179 MODULE_ALIAS_FS("ceph");
1180
1181 int ceph_force_reconnect(struct super_block *sb)
1182 {
1183         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1184         int err = 0;
1185
1186         ceph_umount_begin(sb);
1187
1188         /* Make sure all page caches get invalidated.
1189          * see remove_session_caps_cb() */
1190         flush_workqueue(fsc->inode_wq);
1191
1192         /* In case that we were blacklisted. This also reset
1193          * all mon/osd connections */
1194         ceph_reset_client_addr(fsc->client);
1195
1196         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1197
1198         fsc->blacklisted = false;
1199         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1200
1201         if (sb->s_root) {
1202                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1203                                         CEPH_STAT_CAP_INODE, true);
1204         }
1205         return err;
1206 }
1207
1208 static int __init init_ceph(void)
1209 {
1210         int ret = init_caches();
1211         if (ret)
1212                 goto out;
1213
1214         ceph_flock_init();
1215         ret = register_filesystem(&ceph_fs_type);
1216         if (ret)
1217                 goto out_caches;
1218
1219         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1220
1221         return 0;
1222
1223 out_caches:
1224         destroy_caches();
1225 out:
1226         return ret;
1227 }
1228
1229 static void __exit exit_ceph(void)
1230 {
1231         dout("exit_ceph\n");
1232         unregister_filesystem(&ceph_fs_type);
1233         destroy_caches();
1234 }
1235
1236 module_init(init_ceph);
1237 module_exit(exit_ceph);
1238
1239 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1240 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1241 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1242 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1243 MODULE_LICENSE("GPL");