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 static DEFINE_SPINLOCK(ceph_fsc_lock);
  31 static LIST_HEAD(ceph_fsc_list);
  32
  33 /*
  34  * Ceph superblock operations
  35  *
  36  * Handle the basics of mounting, unmounting.
  37  */
  38
  39 /*
  40  * super ops
  41  */
  42 static void ceph_put_super(struct super_block *s)
  43 {
  44         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  45
  46         dout("put_super\n");
  47         ceph_mdsc_close_sessions(fsc->mdsc);
  48 }
  49
  50 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  51 {
  52         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  53         struct ceph_mon_client *monc = &fsc->client->monc;
  54         struct ceph_statfs st;
  55         u64 fsid;
  56         int err;
  57         u64 data_pool;
  58
  59         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  60                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  61         } else {
  62                 data_pool = CEPH_NOPOOL;
  63         }
  64
  65         dout("statfs\n");
  66         err = ceph_monc_do_statfs(monc, data_pool, &st);
  67         if (err < 0)
  68                 return err;
  69
  70         /* fill in kstatfs */
  71         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  72
  73         /*
  74          * express utilization in terms of large blocks to avoid
  75          * overflow on 32-bit machines.
  76          *
  77          * NOTE: for the time being, we make bsize == frsize to humor
  78          * not-yet-ancient versions of glibc that are broken.
  79          * Someday, we will probably want to report a real block
  80          * size...  whatever that may mean for a network file system!
  81          */
  82         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  83         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  84
  85         /*
  86          * By default use root quota for stats; fallback to overall filesystem
  87          * usage if using 'noquotadf' mount option or if the root dir doesn't
  88          * have max_bytes quota set.
  89          */
  90         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  91             !ceph_quota_update_statfs(fsc, buf)) {
  92                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  93                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  94                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  95         }
  96
  97         buf->f_files = le64_to_cpu(st.num_objects);
  98         buf->f_ffree = -1;
  99         buf->f_namelen = NAME_MAX;
 100
 101         /* Must convert the fsid, for consistent values across arches */
 102         mutex_lock(&monc->mutex);
 103         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
 104                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 105         mutex_unlock(&monc->mutex);
 106
 107         buf->f_fsid = u64_to_fsid(fsid);
 108
 109         return 0;
 110 }
 111
 112 static int ceph_sync_fs(struct super_block *sb, int wait)
 113 {
 114         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 115
 116         if (!wait) {
 117                 dout("sync_fs (non-blocking)\n");
 118                 ceph_flush_dirty_caps(fsc->mdsc);
 119                 dout("sync_fs (non-blocking) done\n");
 120                 return 0;
 121         }
 122
 123         dout("sync_fs (blocking)\n");
 124         ceph_osdc_sync(&fsc->client->osdc);
 125         ceph_mdsc_sync(fsc->mdsc);
 126         dout("sync_fs (blocking) done\n");
 127         return 0;
 128 }
 129
 130 /*
 131  * mount options
 132  */
 133 enum {
 134         Opt_wsize,
 135         Opt_rsize,
 136         Opt_rasize,
 137         Opt_caps_wanted_delay_min,
 138         Opt_caps_wanted_delay_max,
 139         Opt_caps_max,
 140         Opt_readdir_max_entries,
 141         Opt_readdir_max_bytes,
 142         Opt_congestion_kb,
 143         /* int args above */
 144         Opt_snapdirname,
 145         Opt_mds_namespace,
 146         Opt_recover_session,
 147         Opt_source,
 148         /* string args above */
 149         Opt_dirstat,
 150         Opt_rbytes,
 151         Opt_asyncreaddir,
 152         Opt_dcache,
 153         Opt_ino32,
 154         Opt_fscache,
 155         Opt_poolperm,
 156         Opt_require_active_mds,
 157         Opt_acl,
 158         Opt_quotadf,
 159         Opt_copyfrom,
 160         Opt_wsync,
 161 };
 162
 163 enum ceph_recover_session_mode {
 164         ceph_recover_session_no,
 165         ceph_recover_session_clean
 166 };
 167
 168 static const struct constant_table ceph_param_recover[] = {
 169         { "no",         ceph_recover_session_no },
 170         { "clean",      ceph_recover_session_clean },
 171         {}
 172 };
 173
 174 static const struct fs_parameter_spec ceph_mount_parameters[] = {
 175         fsparam_flag_no ("acl",                         Opt_acl),
 176         fsparam_flag_no ("asyncreaddir",                Opt_asyncreaddir),
 177         fsparam_s32     ("caps_max",                    Opt_caps_max),
 178         fsparam_u32     ("caps_wanted_delay_max",       Opt_caps_wanted_delay_max),
 179         fsparam_u32     ("caps_wanted_delay_min",       Opt_caps_wanted_delay_min),
 180         fsparam_u32     ("write_congestion_kb",         Opt_congestion_kb),
 181         fsparam_flag_no ("copyfrom",                    Opt_copyfrom),
 182         fsparam_flag_no ("dcache",                      Opt_dcache),
 183         fsparam_flag_no ("dirstat",                     Opt_dirstat),
 184         fsparam_flag_no ("fsc",                         Opt_fscache), // fsc|nofsc
 185         fsparam_string  ("fsc",                         Opt_fscache), // fsc=...
 186         fsparam_flag_no ("ino32",                       Opt_ino32),
 187         fsparam_string  ("mds_namespace",               Opt_mds_namespace),
 188         fsparam_flag_no ("poolperm",                    Opt_poolperm),
 189         fsparam_flag_no ("quotadf",                     Opt_quotadf),
 190         fsparam_u32     ("rasize",                      Opt_rasize),
 191         fsparam_flag_no ("rbytes",                      Opt_rbytes),
 192         fsparam_u32     ("readdir_max_bytes",           Opt_readdir_max_bytes),
 193         fsparam_u32     ("readdir_max_entries",         Opt_readdir_max_entries),
 194         fsparam_enum    ("recover_session",             Opt_recover_session, ceph_param_recover),
 195         fsparam_flag_no ("require_active_mds",          Opt_require_active_mds),
 196         fsparam_u32     ("rsize",                       Opt_rsize),
 197         fsparam_string  ("snapdirname",                 Opt_snapdirname),
 198         fsparam_string  ("source",                      Opt_source),
 199         fsparam_u32     ("wsize",                       Opt_wsize),
 200         fsparam_flag_no ("wsync",                       Opt_wsync),
 201         {}
 202 };
 203
 204 struct ceph_parse_opts_ctx {
 205         struct ceph_options             *copts;
 206         struct ceph_mount_options       *opts;
 207 };
 208
 209 /*
 210  * Remove adjacent slashes and then the trailing slash, unless it is
 211  * the only remaining character.
 212  *
 213  * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
 214  */
 215 static void canonicalize_path(char *path)
 216 {
 217         int i, j = 0;
 218
 219         for (i = 0; path[i] != '\0'; i++) {
 220                 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
 221                         path[j++] = path[i];
 222         }
 223
 224         if (j > 1 && path[j - 1] == '/')
 225                 j--;
 226         path[j] = '\0';
 227 }
 228
 229 /*
 230  * Parse the source parameter.  Distinguish the server list from the path.
 231  *
 232  * The source will look like:
 233  *     <server_spec>[,<server_spec>...]:[<path>]
 234  * where
 235  *     <server_spec> is <ip>[:<port>]
 236  *     <path> is optional, but if present must begin with '/'
 237  */
 238 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
 239 {
 240         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 241         struct ceph_mount_options *fsopt = pctx->opts;
 242         char *dev_name = param->string, *dev_name_end;
 243         int ret;
 244
 245         dout("%s '%s'\n", __func__, dev_name);
 246         if (!dev_name || !*dev_name)
 247                 return invalfc(fc, "Empty source");
 248
 249         dev_name_end = strchr(dev_name, '/');
 250         if (dev_name_end) {
 251                 /*
 252                  * The server_path will include the whole chars from userland
 253                  * including the leading '/'.
 254                  */
 255                 kfree(fsopt->server_path);
 256                 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 257                 if (!fsopt->server_path)
 258                         return -ENOMEM;
 259
 260                 canonicalize_path(fsopt->server_path);
 261         } else {
 262                 dev_name_end = dev_name + strlen(dev_name);
 263         }
 264
 265         dev_name_end--;         /* back up to ':' separator */
 266         if (dev_name_end < dev_name || *dev_name_end != ':')
 267                 return invalfc(fc, "No path or : separator in source");
 268
 269         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 270         if (fsopt->server_path)
 271                 dout("server path '%s'\n", fsopt->server_path);
 272
 273         ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
 274                                  pctx->copts, fc->log.log);
 275         if (ret)
 276                 return ret;
 277
 278         fc->source = param->string;
 279         param->string = NULL;
 280         return 0;
 281 }
 282
 283 static int ceph_parse_mount_param(struct fs_context *fc,
 284                                   struct fs_parameter *param)
 285 {
 286         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 287         struct ceph_mount_options *fsopt = pctx->opts;
 288         struct fs_parse_result result;
 289         unsigned int mode;
 290         int token, ret;
 291
 292         ret = ceph_parse_param(param, pctx->copts, fc->log.log);
 293         if (ret != -ENOPARAM)
 294                 return ret;
 295
 296         token = fs_parse(fc, ceph_mount_parameters, param, &result);
 297         dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
 298         if (token < 0)
 299                 return token;
 300
 301         switch (token) {
 302         case Opt_snapdirname:
 303                 kfree(fsopt->snapdir_name);
 304                 fsopt->snapdir_name = param->string;
 305                 param->string = NULL;
 306                 break;
 307         case Opt_mds_namespace:
 308                 kfree(fsopt->mds_namespace);
 309                 fsopt->mds_namespace = param->string;
 310                 param->string = NULL;
 311                 break;
 312         case Opt_recover_session:
 313                 mode = result.uint_32;
 314                 if (mode == ceph_recover_session_no)
 315                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 316                 else if (mode == ceph_recover_session_clean)
 317                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 318                 else
 319                         BUG();
 320                 break;
 321         case Opt_source:
 322                 if (fc->source)
 323                         return invalfc(fc, "Multiple sources specified");
 324                 return ceph_parse_source(param, fc);
 325         case Opt_wsize:
 326                 if (result.uint_32 < PAGE_SIZE ||
 327                     result.uint_32 > CEPH_MAX_WRITE_SIZE)
 328                         goto out_of_range;
 329                 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
 330                 break;
 331         case Opt_rsize:
 332                 if (result.uint_32 < PAGE_SIZE ||
 333                     result.uint_32 > CEPH_MAX_READ_SIZE)
 334                         goto out_of_range;
 335                 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
 336                 break;
 337         case Opt_rasize:
 338                 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
 339                 break;
 340         case Opt_caps_wanted_delay_min:
 341                 if (result.uint_32 < 1)
 342                         goto out_of_range;
 343                 fsopt->caps_wanted_delay_min = result.uint_32;
 344                 break;
 345         case Opt_caps_wanted_delay_max:
 346                 if (result.uint_32 < 1)
 347                         goto out_of_range;
 348                 fsopt->caps_wanted_delay_max = result.uint_32;
 349                 break;
 350         case Opt_caps_max:
 351                 if (result.int_32 < 0)
 352                         goto out_of_range;
 353                 fsopt->caps_max = result.int_32;
 354                 break;
 355         case Opt_readdir_max_entries:
 356                 if (result.uint_32 < 1)
 357                         goto out_of_range;
 358                 fsopt->max_readdir = result.uint_32;
 359                 break;
 360         case Opt_readdir_max_bytes:
 361                 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
 362                         goto out_of_range;
 363                 fsopt->max_readdir_bytes = result.uint_32;
 364                 break;
 365         case Opt_congestion_kb:
 366                 if (result.uint_32 < 1024) /* at least 1M */
 367                         goto out_of_range;
 368                 fsopt->congestion_kb = result.uint_32;
 369                 break;
 370         case Opt_dirstat:
 371                 if (!result.negated)
 372                         fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 373                 else
 374                         fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 375                 break;
 376         case Opt_rbytes:
 377                 if (!result.negated)
 378                         fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 379                 else
 380                         fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 381                 break;
 382         case Opt_asyncreaddir:
 383                 if (!result.negated)
 384                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 385                 else
 386                         fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 387                 break;
 388         case Opt_dcache:
 389                 if (!result.negated)
 390                         fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 391                 else
 392                         fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 393                 break;
 394         case Opt_ino32:
 395                 if (!result.negated)
 396                         fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 397                 else
 398                         fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 399                 break;
 400
 401         case Opt_fscache:
 402 #ifdef CONFIG_CEPH_FSCACHE
 403                 kfree(fsopt->fscache_uniq);
 404                 fsopt->fscache_uniq = NULL;
 405                 if (result.negated) {
 406                         fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 407                 } else {
 408                         fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 409                         fsopt->fscache_uniq = param->string;
 410                         param->string = NULL;
 411                 }
 412                 break;
 413 #else
 414                 return invalfc(fc, "fscache support is disabled");
 415 #endif
 416         case Opt_poolperm:
 417                 if (!result.negated)
 418                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 419                 else
 420                         fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 421                 break;
 422         case Opt_require_active_mds:
 423                 if (!result.negated)
 424                         fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 425                 else
 426                         fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 427                 break;
 428         case Opt_quotadf:
 429                 if (!result.negated)
 430                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 431                 else
 432                         fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 433                 break;
 434         case Opt_copyfrom:
 435                 if (!result.negated)
 436                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 437                 else
 438                         fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 439                 break;
 440         case Opt_acl:
 441                 if (!result.negated) {
 442 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 443                         fc->sb_flags |= SB_POSIXACL;
 444 #else
 445                         return invalfc(fc, "POSIX ACL support is disabled");
 446 #endif
 447                 } else {
 448                         fc->sb_flags &= ~SB_POSIXACL;
 449                 }
 450                 break;
 451         case Opt_wsync:
 452                 if (!result.negated)
 453                         fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
 454                 else
 455                         fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
 456                 break;
 457         default:
 458                 BUG();
 459         }
 460         return 0;
 461
 462 out_of_range:
 463         return invalfc(fc, "%s out of range", param->key);
 464 }
 465
 466 static void destroy_mount_options(struct ceph_mount_options *args)
 467 {
 468         dout("destroy_mount_options %p\n", args);
 469         if (!args)
 470                 return;
 471
 472         kfree(args->snapdir_name);
 473         kfree(args->mds_namespace);
 474         kfree(args->server_path);
 475         kfree(args->fscache_uniq);
 476         kfree(args);
 477 }
 478
 479 static int strcmp_null(const char *s1, const char *s2)
 480 {
 481         if (!s1 && !s2)
 482                 return 0;
 483         if (s1 && !s2)
 484                 return -1;
 485         if (!s1 && s2)
 486                 return 1;
 487         return strcmp(s1, s2);
 488 }
 489
 490 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 491                                  struct ceph_options *new_opt,
 492                                  struct ceph_fs_client *fsc)
 493 {
 494         struct ceph_mount_options *fsopt1 = new_fsopt;
 495         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 496         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 497         int ret;
 498
 499         ret = memcmp(fsopt1, fsopt2, ofs);
 500         if (ret)
 501                 return ret;
 502
 503         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 504         if (ret)
 505                 return ret;
 506
 507         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 508         if (ret)
 509                 return ret;
 510
 511         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 512         if (ret)
 513                 return ret;
 514
 515         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 516         if (ret)
 517                 return ret;
 518
 519         return ceph_compare_options(new_opt, fsc->client);
 520 }
 521
 522 /**
 523  * ceph_show_options - Show mount options in /proc/mounts
 524  * @m: seq_file to write to
 525  * @root: root of that (sub)tree
 526  */
 527 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 528 {
 529         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 530         struct ceph_mount_options *fsopt = fsc->mount_options;
 531         size_t pos;
 532         int ret;
 533
 534         /* a comma between MNT/MS and client options */
 535         seq_putc(m, ',');
 536         pos = m->count;
 537
 538         ret = ceph_print_client_options(m, fsc->client, false);
 539         if (ret)
 540                 return ret;
 541
 542         /* retract our comma if no client options */
 543         if (m->count == pos)
 544                 m->count--;
 545
 546         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 547                 seq_puts(m, ",dirstat");
 548         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 549                 seq_puts(m, ",rbytes");
 550         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 551                 seq_puts(m, ",noasyncreaddir");
 552         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 553                 seq_puts(m, ",nodcache");
 554         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 555                 seq_puts(m, ",ino32");
 556         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 557                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 558         }
 559         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 560                 seq_puts(m, ",nopoolperm");
 561         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 562                 seq_puts(m, ",noquotadf");
 563
 564 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 565         if (root->d_sb->s_flags & SB_POSIXACL)
 566                 seq_puts(m, ",acl");
 567         else
 568                 seq_puts(m, ",noacl");
 569 #endif
 570
 571         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 572                 seq_puts(m, ",copyfrom");
 573
 574         if (fsopt->mds_namespace)
 575                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 576
 577         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 578                 seq_show_option(m, "recover_session", "clean");
 579
 580         if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
 581                 seq_puts(m, ",nowsync");
 582
 583         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 584                 seq_printf(m, ",wsize=%u", fsopt->wsize);
 585         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 586                 seq_printf(m, ",rsize=%u", fsopt->rsize);
 587         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 588                 seq_printf(m, ",rasize=%u", fsopt->rasize);
 589         if (fsopt->congestion_kb != default_congestion_kb())
 590                 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
 591         if (fsopt->caps_max)
 592                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 593         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 594                 seq_printf(m, ",caps_wanted_delay_min=%u",
 595                          fsopt->caps_wanted_delay_min);
 596         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 597                 seq_printf(m, ",caps_wanted_delay_max=%u",
 598                            fsopt->caps_wanted_delay_max);
 599         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 600                 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
 601         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 602                 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
 603         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 604                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 605
 606         return 0;
 607 }
 608
 609 /*
 610  * handle any mon messages the standard library doesn't understand.
 611  * return error if we don't either.
 612  */
 613 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 614 {
 615         struct ceph_fs_client *fsc = client->private;
 616         int type = le16_to_cpu(msg->hdr.type);
 617
 618         switch (type) {
 619         case CEPH_MSG_MDS_MAP:
 620                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 621                 return 0;
 622         case CEPH_MSG_FS_MAP_USER:
 623                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 624                 return 0;
 625         default:
 626                 return -1;
 627         }
 628 }
 629
 630 /*
 631  * create a new fs client
 632  *
 633  * Success or not, this function consumes @fsopt and @opt.
 634  */
 635 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 636                                         struct ceph_options *opt)
 637 {
 638         struct ceph_fs_client *fsc;
 639         int err;
 640
 641         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 642         if (!fsc) {
 643                 err = -ENOMEM;
 644                 goto fail;
 645         }
 646
 647         fsc->client = ceph_create_client(opt, fsc);
 648         if (IS_ERR(fsc->client)) {
 649                 err = PTR_ERR(fsc->client);
 650                 goto fail;
 651         }
 652         opt = NULL; /* fsc->client now owns this */
 653
 654         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 655         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 656
 657         if (!fsopt->mds_namespace) {
 658                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 659                                    0, true);
 660         } else {
 661                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 662                                    0, false);
 663         }
 664
 665         fsc->mount_options = fsopt;
 666
 667         fsc->sb = NULL;
 668         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 669         fsc->filp_gen = 1;
 670         fsc->have_copy_from2 = true;
 671
 672         atomic_long_set(&fsc->writeback_count, 0);
 673
 674         err = -ENOMEM;
 675         /*
 676          * The number of concurrent works can be high but they don't need
 677          * to be processed in parallel, limit concurrency.
 678          */
 679         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 680         if (!fsc->inode_wq)
 681                 goto fail_client;
 682         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 683         if (!fsc->cap_wq)
 684                 goto fail_inode_wq;
 685
 686         spin_lock(&ceph_fsc_lock);
 687         list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
 688         spin_unlock(&ceph_fsc_lock);
 689
 690         return fsc;
 691
 692 fail_inode_wq:
 693         destroy_workqueue(fsc->inode_wq);
 694 fail_client:
 695         ceph_destroy_client(fsc->client);
 696 fail:
 697         kfree(fsc);
 698         if (opt)
 699                 ceph_destroy_options(opt);
 700         destroy_mount_options(fsopt);
 701         return ERR_PTR(err);
 702 }
 703
 704 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 705 {
 706         flush_workqueue(fsc->inode_wq);
 707         flush_workqueue(fsc->cap_wq);
 708 }
 709
 710 static void destroy_fs_client(struct ceph_fs_client *fsc)
 711 {
 712         dout("destroy_fs_client %p\n", fsc);
 713
 714         spin_lock(&ceph_fsc_lock);
 715         list_del(&fsc->metric_wakeup);
 716         spin_unlock(&ceph_fsc_lock);
 717
 718         ceph_mdsc_destroy(fsc);
 719         destroy_workqueue(fsc->inode_wq);
 720         destroy_workqueue(fsc->cap_wq);
 721
 722         destroy_mount_options(fsc->mount_options);
 723
 724         ceph_destroy_client(fsc->client);
 725
 726         kfree(fsc);
 727         dout("destroy_fs_client %p done\n", fsc);
 728 }
 729
 730 /*
 731  * caches
 732  */
 733 struct kmem_cache *ceph_inode_cachep;
 734 struct kmem_cache *ceph_cap_cachep;
 735 struct kmem_cache *ceph_cap_flush_cachep;
 736 struct kmem_cache *ceph_dentry_cachep;
 737 struct kmem_cache *ceph_file_cachep;
 738 struct kmem_cache *ceph_dir_file_cachep;
 739 struct kmem_cache *ceph_mds_request_cachep;
 740 mempool_t *ceph_wb_pagevec_pool;
 741
 742 static void ceph_inode_init_once(void *foo)
 743 {
 744         struct ceph_inode_info *ci = foo;
 745         inode_init_once(&ci->vfs_inode);
 746 }
 747
 748 static int __init init_caches(void)
 749 {
 750         int error = -ENOMEM;
 751
 752         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 753                                       sizeof(struct ceph_inode_info),
 754                                       __alignof__(struct ceph_inode_info),
 755                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 756                                       SLAB_ACCOUNT, ceph_inode_init_once);
 757         if (!ceph_inode_cachep)
 758                 return -ENOMEM;
 759
 760         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 761         if (!ceph_cap_cachep)
 762                 goto bad_cap;
 763         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 764                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 765         if (!ceph_cap_flush_cachep)
 766                 goto bad_cap_flush;
 767
 768         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 769                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 770         if (!ceph_dentry_cachep)
 771                 goto bad_dentry;
 772
 773         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 774         if (!ceph_file_cachep)
 775                 goto bad_file;
 776
 777         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 778         if (!ceph_dir_file_cachep)
 779                 goto bad_dir_file;
 780
 781         ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
 782         if (!ceph_mds_request_cachep)
 783                 goto bad_mds_req;
 784
 785         ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
 786         if (!ceph_wb_pagevec_pool)
 787                 goto bad_pagevec_pool;
 788
 789         error = ceph_fscache_register();
 790         if (error)
 791                 goto bad_fscache;
 792
 793         return 0;
 794
 795 bad_fscache:
 796         kmem_cache_destroy(ceph_mds_request_cachep);
 797 bad_pagevec_pool:
 798         mempool_destroy(ceph_wb_pagevec_pool);
 799 bad_mds_req:
 800         kmem_cache_destroy(ceph_dir_file_cachep);
 801 bad_dir_file:
 802         kmem_cache_destroy(ceph_file_cachep);
 803 bad_file:
 804         kmem_cache_destroy(ceph_dentry_cachep);
 805 bad_dentry:
 806         kmem_cache_destroy(ceph_cap_flush_cachep);
 807 bad_cap_flush:
 808         kmem_cache_destroy(ceph_cap_cachep);
 809 bad_cap:
 810         kmem_cache_destroy(ceph_inode_cachep);
 811         return error;
 812 }
 813
 814 static void destroy_caches(void)
 815 {
 816         /*
 817          * Make sure all delayed rcu free inodes are flushed before we
 818          * destroy cache.
 819          */
 820         rcu_barrier();
 821
 822         kmem_cache_destroy(ceph_inode_cachep);
 823         kmem_cache_destroy(ceph_cap_cachep);
 824         kmem_cache_destroy(ceph_cap_flush_cachep);
 825         kmem_cache_destroy(ceph_dentry_cachep);
 826         kmem_cache_destroy(ceph_file_cachep);
 827         kmem_cache_destroy(ceph_dir_file_cachep);
 828         kmem_cache_destroy(ceph_mds_request_cachep);
 829         mempool_destroy(ceph_wb_pagevec_pool);
 830
 831         ceph_fscache_unregister();
 832 }
 833
 834 static void __ceph_umount_begin(struct ceph_fs_client *fsc)
 835 {
 836         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 837         ceph_mdsc_force_umount(fsc->mdsc);
 838         fsc->filp_gen++; // invalidate open files
 839 }
 840
 841 /*
 842  * ceph_umount_begin - initiate forced umount.  Tear down the
 843  * mount, skipping steps that may hang while waiting for server(s).
 844  */
 845 static void ceph_umount_begin(struct super_block *sb)
 846 {
 847         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 848
 849         dout("ceph_umount_begin - starting forced umount\n");
 850         if (!fsc)
 851                 return;
 852         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 853         __ceph_umount_begin(fsc);
 854 }
 855
 856 static const struct super_operations ceph_super_ops = {
 857         .alloc_inode    = ceph_alloc_inode,
 858         .free_inode     = ceph_free_inode,
 859         .write_inode    = ceph_write_inode,
 860         .drop_inode     = generic_delete_inode,
 861         .evict_inode    = ceph_evict_inode,
 862         .sync_fs        = ceph_sync_fs,
 863         .put_super      = ceph_put_super,
 864         .show_options   = ceph_show_options,
 865         .statfs         = ceph_statfs,
 866         .umount_begin   = ceph_umount_begin,
 867 };
 868
 869 /*
 870  * Bootstrap mount by opening the root directory.  Note the mount
 871  * @started time from caller, and time out if this takes too long.
 872  */
 873 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 874                                        const char *path,
 875                                        unsigned long started)
 876 {
 877         struct ceph_mds_client *mdsc = fsc->mdsc;
 878         struct ceph_mds_request *req = NULL;
 879         int err;
 880         struct dentry *root;
 881
 882         /* open dir */
 883         dout("open_root_inode opening '%s'\n", path);
 884         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 885         if (IS_ERR(req))
 886                 return ERR_CAST(req);
 887         req->r_path1 = kstrdup(path, GFP_NOFS);
 888         if (!req->r_path1) {
 889                 root = ERR_PTR(-ENOMEM);
 890                 goto out;
 891         }
 892
 893         req->r_ino1.ino = CEPH_INO_ROOT;
 894         req->r_ino1.snap = CEPH_NOSNAP;
 895         req->r_started = started;
 896         req->r_timeout = fsc->client->options->mount_timeout;
 897         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 898         req->r_num_caps = 2;
 899         err = ceph_mdsc_do_request(mdsc, NULL, req);
 900         if (err == 0) {
 901                 struct inode *inode = req->r_target_inode;
 902                 req->r_target_inode = NULL;
 903                 dout("open_root_inode success\n");
 904                 root = d_make_root(inode);
 905                 if (!root) {
 906                         root = ERR_PTR(-ENOMEM);
 907                         goto out;
 908                 }
 909                 dout("open_root_inode success, root dentry is %p\n", root);
 910         } else {
 911                 root = ERR_PTR(err);
 912         }
 913 out:
 914         ceph_mdsc_put_request(req);
 915         return root;
 916 }
 917
 918 /*
 919  * mount: join the ceph cluster, and open root directory.
 920  */
 921 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 922                                       struct fs_context *fc)
 923 {
 924         int err;
 925         unsigned long started = jiffies;  /* note the start time */
 926         struct dentry *root;
 927
 928         dout("mount start %p\n", fsc);
 929         mutex_lock(&fsc->client->mount_mutex);
 930
 931         if (!fsc->sb->s_root) {
 932                 const char *path = fsc->mount_options->server_path ?
 933                                      fsc->mount_options->server_path + 1 : "";
 934
 935                 err = __ceph_open_session(fsc->client, started);
 936                 if (err < 0)
 937                         goto out;
 938
 939                 /* setup fscache */
 940                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 941                         err = ceph_fscache_register_fs(fsc, fc);
 942                         if (err < 0)
 943                                 goto out;
 944                 }
 945
 946                 dout("mount opening path '%s'\n", path);
 947
 948                 ceph_fs_debugfs_init(fsc);
 949
 950                 root = open_root_dentry(fsc, path, started);
 951                 if (IS_ERR(root)) {
 952                         err = PTR_ERR(root);
 953                         goto out;
 954                 }
 955                 fsc->sb->s_root = dget(root);
 956         } else {
 957                 root = dget(fsc->sb->s_root);
 958         }
 959
 960         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 961         dout("mount success\n");
 962         mutex_unlock(&fsc->client->mount_mutex);
 963         return root;
 964
 965 out:
 966         mutex_unlock(&fsc->client->mount_mutex);
 967         return ERR_PTR(err);
 968 }
 969
 970 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
 971 {
 972         struct ceph_fs_client *fsc = s->s_fs_info;
 973         int ret;
 974
 975         dout("set_super %p\n", s);
 976
 977         s->s_maxbytes = MAX_LFS_FILESIZE;
 978
 979         s->s_xattr = ceph_xattr_handlers;
 980         fsc->sb = s;
 981         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 982
 983         s->s_op = &ceph_super_ops;
 984         s->s_d_op = &ceph_dentry_ops;
 985         s->s_export_op = &ceph_export_ops;
 986
 987         s->s_time_gran = 1;
 988         s->s_time_min = 0;
 989         s->s_time_max = U32_MAX;
 990
 991         ret = set_anon_super_fc(s, fc);
 992         if (ret != 0)
 993                 fsc->sb = NULL;
 994         return ret;
 995 }
 996
 997 /*
 998  * share superblock if same fs AND options
 999  */
1000 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1001 {
1002         struct ceph_fs_client *new = fc->s_fs_info;
1003         struct ceph_mount_options *fsopt = new->mount_options;
1004         struct ceph_options *opt = new->client->options;
1005         struct ceph_fs_client *other = ceph_sb_to_client(sb);
1006
1007         dout("ceph_compare_super %p\n", sb);
1008
1009         if (compare_mount_options(fsopt, opt, other)) {
1010                 dout("monitor(s)/mount options don't match\n");
1011                 return 0;
1012         }
1013         if ((opt->flags & CEPH_OPT_FSID) &&
1014             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1015                 dout("fsid doesn't match\n");
1016                 return 0;
1017         }
1018         if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1019                 dout("flags differ\n");
1020                 return 0;
1021         }
1022         return 1;
1023 }
1024
1025 /*
1026  * construct our own bdi so we can control readahead, etc.
1027  */
1028 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1029
1030 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1031 {
1032         int err;
1033
1034         err = super_setup_bdi_name(sb, "ceph-%ld",
1035                                    atomic_long_inc_return(&bdi_seq));
1036         if (err)
1037                 return err;
1038
1039         /* set ra_pages based on rasize mount option? */
1040         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1041
1042         /* set io_pages based on max osd read size */
1043         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1044
1045         return 0;
1046 }
1047
1048 static int ceph_get_tree(struct fs_context *fc)
1049 {
1050         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1051         struct super_block *sb;
1052         struct ceph_fs_client *fsc;
1053         struct dentry *res;
1054         int (*compare_super)(struct super_block *, struct fs_context *) =
1055                 ceph_compare_super;
1056         int err;
1057
1058         dout("ceph_get_tree\n");
1059
1060         if (!fc->source)
1061                 return invalfc(fc, "No source");
1062
1063         /* create client (which we may/may not use) */
1064         fsc = create_fs_client(pctx->opts, pctx->copts);
1065         pctx->opts = NULL;
1066         pctx->copts = NULL;
1067         if (IS_ERR(fsc)) {
1068                 err = PTR_ERR(fsc);
1069                 goto out_final;
1070         }
1071
1072         err = ceph_mdsc_init(fsc);
1073         if (err < 0)
1074                 goto out;
1075
1076         if (ceph_test_opt(fsc->client, NOSHARE))
1077                 compare_super = NULL;
1078
1079         fc->s_fs_info = fsc;
1080         sb = sget_fc(fc, compare_super, ceph_set_super);
1081         fc->s_fs_info = NULL;
1082         if (IS_ERR(sb)) {
1083                 err = PTR_ERR(sb);
1084                 goto out;
1085         }
1086
1087         if (ceph_sb_to_client(sb) != fsc) {
1088                 destroy_fs_client(fsc);
1089                 fsc = ceph_sb_to_client(sb);
1090                 dout("get_sb got existing client %p\n", fsc);
1091         } else {
1092                 dout("get_sb using new client %p\n", fsc);
1093                 err = ceph_setup_bdi(sb, fsc);
1094                 if (err < 0)
1095                         goto out_splat;
1096         }
1097
1098         res = ceph_real_mount(fsc, fc);
1099         if (IS_ERR(res)) {
1100                 err = PTR_ERR(res);
1101                 goto out_splat;
1102         }
1103         dout("root %p inode %p ino %llx.%llx\n", res,
1104              d_inode(res), ceph_vinop(d_inode(res)));
1105         fc->root = fsc->sb->s_root;
1106         return 0;
1107
1108 out_splat:
1109         if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1110                 pr_info("No mds server is up or the cluster is laggy\n");
1111                 err = -EHOSTUNREACH;
1112         }
1113
1114         ceph_mdsc_close_sessions(fsc->mdsc);
1115         deactivate_locked_super(sb);
1116         goto out_final;
1117
1118 out:
1119         destroy_fs_client(fsc);
1120 out_final:
1121         dout("ceph_get_tree fail %d\n", err);
1122         return err;
1123 }
1124
1125 static void ceph_free_fc(struct fs_context *fc)
1126 {
1127         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1128
1129         if (pctx) {
1130                 destroy_mount_options(pctx->opts);
1131                 ceph_destroy_options(pctx->copts);
1132                 kfree(pctx);
1133         }
1134 }
1135
1136 static int ceph_reconfigure_fc(struct fs_context *fc)
1137 {
1138         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1139         struct ceph_mount_options *fsopt = pctx->opts;
1140         struct ceph_fs_client *fsc = ceph_sb_to_client(fc->root->d_sb);
1141
1142         if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1143                 ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1144         else
1145                 ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1146
1147         sync_filesystem(fc->root->d_sb);
1148         return 0;
1149 }
1150
1151 static const struct fs_context_operations ceph_context_ops = {
1152         .free           = ceph_free_fc,
1153         .parse_param    = ceph_parse_mount_param,
1154         .get_tree       = ceph_get_tree,
1155         .reconfigure    = ceph_reconfigure_fc,
1156 };
1157
1158 /*
1159  * Set up the filesystem mount context.
1160  */
1161 static int ceph_init_fs_context(struct fs_context *fc)
1162 {
1163         struct ceph_parse_opts_ctx *pctx;
1164         struct ceph_mount_options *fsopt;
1165
1166         pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1167         if (!pctx)
1168                 return -ENOMEM;
1169
1170         pctx->copts = ceph_alloc_options();
1171         if (!pctx->copts)
1172                 goto nomem;
1173
1174         pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1175         if (!pctx->opts)
1176                 goto nomem;
1177
1178         fsopt = pctx->opts;
1179         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1180
1181         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1182         fsopt->rsize = CEPH_MAX_READ_SIZE;
1183         fsopt->rasize = CEPH_RASIZE_DEFAULT;
1184         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1185         if (!fsopt->snapdir_name)
1186                 goto nomem;
1187
1188         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1189         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1190         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1191         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1192         fsopt->congestion_kb = default_congestion_kb();
1193
1194 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1195         fc->sb_flags |= SB_POSIXACL;
1196 #endif
1197
1198         fc->fs_private = pctx;
1199         fc->ops = &ceph_context_ops;
1200         return 0;
1201
1202 nomem:
1203         destroy_mount_options(pctx->opts);
1204         ceph_destroy_options(pctx->copts);
1205         kfree(pctx);
1206         return -ENOMEM;
1207 }
1208
1209 static void ceph_kill_sb(struct super_block *s)
1210 {
1211         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1212
1213         dout("kill_sb %p\n", s);
1214
1215         ceph_mdsc_pre_umount(fsc->mdsc);
1216         flush_fs_workqueues(fsc);
1217
1218         kill_anon_super(s);
1219
1220         fsc->client->extra_mon_dispatch = NULL;
1221         ceph_fs_debugfs_cleanup(fsc);
1222
1223         ceph_fscache_unregister_fs(fsc);
1224
1225         destroy_fs_client(fsc);
1226 }
1227
1228 static struct file_system_type ceph_fs_type = {
1229         .owner          = THIS_MODULE,
1230         .name           = "ceph",
1231         .init_fs_context = ceph_init_fs_context,
1232         .kill_sb        = ceph_kill_sb,
1233         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1234 };
1235 MODULE_ALIAS_FS("ceph");
1236
1237 int ceph_force_reconnect(struct super_block *sb)
1238 {
1239         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1240         int err = 0;
1241
1242         fsc->mount_state = CEPH_MOUNT_RECOVER;
1243         __ceph_umount_begin(fsc);
1244
1245         /* Make sure all page caches get invalidated.
1246          * see remove_session_caps_cb() */
1247         flush_workqueue(fsc->inode_wq);
1248
1249         /* In case that we were blocklisted. This also reset
1250          * all mon/osd connections */
1251         ceph_reset_client_addr(fsc->client);
1252
1253         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1254
1255         fsc->blocklisted = false;
1256         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1257
1258         if (sb->s_root) {
1259                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1260                                         CEPH_STAT_CAP_INODE, true);
1261         }
1262         return err;
1263 }
1264
1265 static int __init init_ceph(void)
1266 {
1267         int ret = init_caches();
1268         if (ret)
1269                 goto out;
1270
1271         ceph_flock_init();
1272         ret = register_filesystem(&ceph_fs_type);
1273         if (ret)
1274                 goto out_caches;
1275
1276         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1277
1278         return 0;
1279
1280 out_caches:
1281         destroy_caches();
1282 out:
1283         return ret;
1284 }
1285
1286 static void __exit exit_ceph(void)
1287 {
1288         dout("exit_ceph\n");
1289         unregister_filesystem(&ceph_fs_type);
1290         destroy_caches();
1291 }
1292
1293 static int param_set_metrics(const char *val, const struct kernel_param *kp)
1294 {
1295         struct ceph_fs_client *fsc;
1296         int ret;
1297
1298         ret = param_set_bool(val, kp);
1299         if (ret) {
1300                 pr_err("Failed to parse sending metrics switch value '%s'\n",
1301                        val);
1302                 return ret;
1303         } else if (!disable_send_metrics) {
1304                 // wake up all the mds clients
1305                 spin_lock(&ceph_fsc_lock);
1306                 list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1307                         metric_schedule_delayed(&fsc->mdsc->metric);
1308                 }
1309                 spin_unlock(&ceph_fsc_lock);
1310         }
1311
1312         return 0;
1313 }
1314
1315 static const struct kernel_param_ops param_ops_metrics = {
1316         .set = param_set_metrics,
1317         .get = param_get_bool,
1318 };
1319
1320 bool disable_send_metrics = false;
1321 module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
1322 MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1323
1324 module_init(init_ceph);
1325 module_exit(exit_ceph);
1326
1327 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1328 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1329 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1330 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1331 MODULE_LICENSE("GPL");