fs/ceph/super.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ceph_put_super
ceph_statfs
ceph_sync_fs
canonicalize_path
parse_fsopt_token
destroy_mount_options
strcmp_null
compare_mount_options
parse_mount_options
ceph_show_options
extra_mon_dispatch
create_fs_client
flush_fs_workqueues
destroy_fs_client
ceph_inode_init_once
init_caches
destroy_caches
ceph_umount_begin
ceph_remount
open_root_dentry
ceph_real_mount
ceph_set_super
ceph_compare_super
ceph_setup_bdi
ceph_mount
ceph_kill_sb
ceph_force_reconnect
init_ceph
exit_ceph
   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 static int ceph_sync_fs(struct super_block *sb, int wait)
 110 {
 111         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 112 
 113         if (!wait) {
 114                 dout("sync_fs (non-blocking)\n");
 115                 ceph_flush_dirty_caps(fsc->mdsc);
 116                 dout("sync_fs (non-blocking) done\n");
 117                 return 0;
 118         }
 119 
 120         dout("sync_fs (blocking)\n");
 121         ceph_osdc_sync(&fsc->client->osdc);
 122         ceph_mdsc_sync(fsc->mdsc);
 123         dout("sync_fs (blocking) done\n");
 124         return 0;
 125 }
 126 
 127 /*
 128  * mount options
 129  */
 130 enum {
 131         Opt_wsize,
 132         Opt_rsize,
 133         Opt_rasize,
 134         Opt_caps_wanted_delay_min,
 135         Opt_caps_wanted_delay_max,
 136         Opt_caps_max,
 137         Opt_readdir_max_entries,
 138         Opt_readdir_max_bytes,
 139         Opt_congestion_kb,
 140         Opt_last_int,
 141         /* int args above */
 142         Opt_snapdirname,
 143         Opt_mds_namespace,
 144         Opt_fscache_uniq,
 145         Opt_recover_session,
 146         Opt_last_string,
 147         /* string args above */
 148         Opt_dirstat,
 149         Opt_nodirstat,
 150         Opt_rbytes,
 151         Opt_norbytes,
 152         Opt_asyncreaddir,
 153         Opt_noasyncreaddir,
 154         Opt_dcache,
 155         Opt_nodcache,
 156         Opt_ino32,
 157         Opt_noino32,
 158         Opt_fscache,
 159         Opt_nofscache,
 160         Opt_poolperm,
 161         Opt_nopoolperm,
 162         Opt_require_active_mds,
 163         Opt_norequire_active_mds,
 164 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 165         Opt_acl,
 166 #endif
 167         Opt_noacl,
 168         Opt_quotadf,
 169         Opt_noquotadf,
 170         Opt_copyfrom,
 171         Opt_nocopyfrom,
 172 };
 173 
 174 static match_table_t fsopt_tokens = {
 175         {Opt_wsize, "wsize=%d"},
 176         {Opt_rsize, "rsize=%d"},
 177         {Opt_rasize, "rasize=%d"},
 178         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 179         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 180         {Opt_caps_max, "caps_max=%d"},
 181         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 182         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 183         {Opt_congestion_kb, "write_congestion_kb=%d"},
 184         /* int args above */
 185         {Opt_snapdirname, "snapdirname=%s"},
 186         {Opt_mds_namespace, "mds_namespace=%s"},
 187         {Opt_recover_session, "recover_session=%s"},
 188         {Opt_fscache_uniq, "fsc=%s"},
 189         /* string args above */
 190         {Opt_dirstat, "dirstat"},
 191         {Opt_nodirstat, "nodirstat"},
 192         {Opt_rbytes, "rbytes"},
 193         {Opt_norbytes, "norbytes"},
 194         {Opt_asyncreaddir, "asyncreaddir"},
 195         {Opt_noasyncreaddir, "noasyncreaddir"},
 196         {Opt_dcache, "dcache"},
 197         {Opt_nodcache, "nodcache"},
 198         {Opt_ino32, "ino32"},
 199         {Opt_noino32, "noino32"},
 200         {Opt_fscache, "fsc"},
 201         {Opt_nofscache, "nofsc"},
 202         {Opt_poolperm, "poolperm"},
 203         {Opt_nopoolperm, "nopoolperm"},
 204         {Opt_require_active_mds, "require_active_mds"},
 205         {Opt_norequire_active_mds, "norequire_active_mds"},
 206 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 207         {Opt_acl, "acl"},
 208 #endif
 209         {Opt_noacl, "noacl"},
 210         {Opt_quotadf, "quotadf"},
 211         {Opt_noquotadf, "noquotadf"},
 212         {Opt_copyfrom, "copyfrom"},
 213         {Opt_nocopyfrom, "nocopyfrom"},
 214         {-1, NULL}
 215 };
 216 
 217 /*
 218  * Remove adjacent slashes and then the trailing slash, unless it is
 219  * the only remaining character.
 220  *
 221  * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
 222  */
 223 static void canonicalize_path(char *path)
 224 {
 225         int i, j = 0;
 226 
 227         for (i = 0; path[i] != '\0'; i++) {
 228                 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
 229                         path[j++] = path[i];
 230         }
 231 
 232         if (j > 1 && path[j - 1] == '/')
 233                 j--;
 234         path[j] = '\0';
 235 }
 236 
 237 static int parse_fsopt_token(char *c, void *private)
 238 {
 239         struct ceph_mount_options *fsopt = private;
 240         substring_t argstr[MAX_OPT_ARGS];
 241         int token, intval, ret;
 242 
 243         token = match_token((char *)c, fsopt_tokens, argstr);
 244         if (token < 0)
 245                 return -EINVAL;
 246 
 247         if (token < Opt_last_int) {
 248                 ret = match_int(&argstr[0], &intval);
 249                 if (ret < 0) {
 250                         pr_err("bad option arg (not int) at '%s'\n", c);
 251                         return ret;
 252                 }
 253                 dout("got int token %d val %d\n", token, intval);
 254         } else if (token > Opt_last_int && token < Opt_last_string) {
 255                 dout("got string token %d val %s\n", token,
 256                      argstr[0].from);
 257         } else {
 258                 dout("got token %d\n", token);
 259         }
 260 
 261         switch (token) {
 262         case Opt_snapdirname:
 263                 kfree(fsopt->snapdir_name);
 264                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 265                                                argstr[0].to-argstr[0].from,
 266                                                GFP_KERNEL);
 267                 if (!fsopt->snapdir_name)
 268                         return -ENOMEM;
 269                 break;
 270         case Opt_mds_namespace:
 271                 kfree(fsopt->mds_namespace);
 272                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 273                                                 argstr[0].to-argstr[0].from,
 274                                                 GFP_KERNEL);
 275                 if (!fsopt->mds_namespace)
 276                         return -ENOMEM;
 277                 break;
 278         case Opt_recover_session:
 279                 if (!strncmp(argstr[0].from, "no",
 280                              argstr[0].to - argstr[0].from)) {
 281                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 282                 } else if (!strncmp(argstr[0].from, "clean",
 283                                     argstr[0].to - argstr[0].from)) {
 284                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 285                 } else {
 286                         return -EINVAL;
 287                 }
 288                 break;
 289         case Opt_fscache_uniq:
 290 #ifdef CONFIG_CEPH_FSCACHE
 291                 kfree(fsopt->fscache_uniq);
 292                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 293                                                argstr[0].to-argstr[0].from,
 294                                                GFP_KERNEL);
 295                 if (!fsopt->fscache_uniq)
 296                         return -ENOMEM;
 297                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 298                 break;
 299 #else
 300                 pr_err("fscache support is disabled\n");
 301                 return -EINVAL;
 302 #endif
 303         case Opt_wsize:
 304                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 305                         return -EINVAL;
 306                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 307                 break;
 308         case Opt_rsize:
 309                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 310                         return -EINVAL;
 311                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 312                 break;
 313         case Opt_rasize:
 314                 if (intval < 0)
 315                         return -EINVAL;
 316                 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
 317                 break;
 318         case Opt_caps_wanted_delay_min:
 319                 if (intval < 1)
 320                         return -EINVAL;
 321                 fsopt->caps_wanted_delay_min = intval;
 322                 break;
 323         case Opt_caps_wanted_delay_max:
 324                 if (intval < 1)
 325                         return -EINVAL;
 326                 fsopt->caps_wanted_delay_max = intval;
 327                 break;
 328         case Opt_caps_max:
 329                 if (intval < 0)
 330                         return -EINVAL;
 331                 fsopt->caps_max = intval;
 332                 break;
 333         case Opt_readdir_max_entries:
 334                 if (intval < 1)
 335                         return -EINVAL;
 336                 fsopt->max_readdir = intval;
 337                 break;
 338         case Opt_readdir_max_bytes:
 339                 if (intval < (int)PAGE_SIZE && intval != 0)
 340                         return -EINVAL;
 341                 fsopt->max_readdir_bytes = intval;
 342                 break;
 343         case Opt_congestion_kb:
 344                 if (intval < 1024) /* at least 1M */
 345                         return -EINVAL;
 346                 fsopt->congestion_kb = intval;
 347                 break;
 348         case Opt_dirstat:
 349                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 350                 break;
 351         case Opt_nodirstat:
 352                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 353                 break;
 354         case Opt_rbytes:
 355                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 356                 break;
 357         case Opt_norbytes:
 358                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 359                 break;
 360         case Opt_asyncreaddir:
 361                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 362                 break;
 363         case Opt_noasyncreaddir:
 364                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 365                 break;
 366         case Opt_dcache:
 367                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 368                 break;
 369         case Opt_nodcache:
 370                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 371                 break;
 372         case Opt_ino32:
 373                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 374                 break;
 375         case Opt_noino32:
 376                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 377                 break;
 378         case Opt_fscache:
 379 #ifdef CONFIG_CEPH_FSCACHE
 380                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 381                 kfree(fsopt->fscache_uniq);
 382                 fsopt->fscache_uniq = NULL;
 383                 break;
 384 #else
 385                 pr_err("fscache support is disabled\n");
 386                 return -EINVAL;
 387 #endif
 388         case Opt_nofscache:
 389                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 390                 kfree(fsopt->fscache_uniq);
 391                 fsopt->fscache_uniq = NULL;
 392                 break;
 393         case Opt_poolperm:
 394                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 395                 break;
 396         case Opt_nopoolperm:
 397                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 398                 break;
 399         case Opt_require_active_mds:
 400                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 401                 break;
 402         case Opt_norequire_active_mds:
 403                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 404                 break;
 405         case Opt_quotadf:
 406                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 407                 break;
 408         case Opt_noquotadf:
 409                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 410                 break;
 411         case Opt_copyfrom:
 412                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 413                 break;
 414         case Opt_nocopyfrom:
 415                 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 416                 break;
 417 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 418         case Opt_acl:
 419                 fsopt->sb_flags |= SB_POSIXACL;
 420                 break;
 421 #endif
 422         case Opt_noacl:
 423                 fsopt->sb_flags &= ~SB_POSIXACL;
 424                 break;
 425         default:
 426                 BUG_ON(token);
 427         }
 428         return 0;
 429 }
 430 
 431 static void destroy_mount_options(struct ceph_mount_options *args)
 432 {
 433         dout("destroy_mount_options %p\n", args);
 434         kfree(args->snapdir_name);
 435         kfree(args->mds_namespace);
 436         kfree(args->server_path);
 437         kfree(args->fscache_uniq);
 438         kfree(args);
 439 }
 440 
 441 static int strcmp_null(const char *s1, const char *s2)
 442 {
 443         if (!s1 && !s2)
 444                 return 0;
 445         if (s1 && !s2)
 446                 return -1;
 447         if (!s1 && s2)
 448                 return 1;
 449         return strcmp(s1, s2);
 450 }
 451 
 452 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 453                                  struct ceph_options *new_opt,
 454                                  struct ceph_fs_client *fsc)
 455 {
 456         struct ceph_mount_options *fsopt1 = new_fsopt;
 457         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 458         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 459         int ret;
 460 
 461         ret = memcmp(fsopt1, fsopt2, ofs);
 462         if (ret)
 463                 return ret;
 464 
 465         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 466         if (ret)
 467                 return ret;
 468 
 469         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 470         if (ret)
 471                 return ret;
 472 
 473         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 474         if (ret)
 475                 return ret;
 476 
 477         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 478         if (ret)
 479                 return ret;
 480 
 481         return ceph_compare_options(new_opt, fsc->client);
 482 }
 483 
 484 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 485                                struct ceph_options **popt,
 486                                int flags, char *options,
 487                                const char *dev_name)
 488 {
 489         struct ceph_mount_options *fsopt;
 490         const char *dev_name_end;
 491         int err;
 492 
 493         if (!dev_name || !*dev_name)
 494                 return -EINVAL;
 495 
 496         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 497         if (!fsopt)
 498                 return -ENOMEM;
 499 
 500         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 501 
 502         fsopt->sb_flags = flags;
 503         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 504 
 505         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 506         fsopt->rsize = CEPH_MAX_READ_SIZE;
 507         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 508         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 509         if (!fsopt->snapdir_name) {
 510                 err = -ENOMEM;
 511                 goto out;
 512         }
 513 
 514         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 515         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 516         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 517         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 518         fsopt->congestion_kb = default_congestion_kb();
 519 
 520         /*
 521          * Distinguish the server list from the path in "dev_name".
 522          * Internally we do not include the leading '/' in the path.
 523          *
 524          * "dev_name" will look like:
 525          *     <server_spec>[,<server_spec>...]:[<path>]
 526          * where
 527          *     <server_spec> is <ip>[:<port>]
 528          *     <path> is optional, but if present must begin with '/'
 529          */
 530         dev_name_end = strchr(dev_name, '/');
 531         if (dev_name_end) {
 532                 /*
 533                  * The server_path will include the whole chars from userland
 534                  * including the leading '/'.
 535                  */
 536                 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 537                 if (!fsopt->server_path) {
 538                         err = -ENOMEM;
 539                         goto out;
 540                 }
 541 
 542                 canonicalize_path(fsopt->server_path);
 543         } else {
 544                 dev_name_end = dev_name + strlen(dev_name);
 545         }
 546         err = -EINVAL;
 547         dev_name_end--;         /* back up to ':' separator */
 548         if (dev_name_end < dev_name || *dev_name_end != ':') {
 549                 pr_err("device name is missing path (no : separator in %s)\n",
 550                                 dev_name);
 551                 goto out;
 552         }
 553         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 554         if (fsopt->server_path)
 555                 dout("server path '%s'\n", fsopt->server_path);
 556 
 557         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 558                                  parse_fsopt_token, (void *)fsopt);
 559         if (IS_ERR(*popt)) {
 560                 err = PTR_ERR(*popt);
 561                 goto out;
 562         }
 563 
 564         /* success */
 565         *pfsopt = fsopt;
 566         return 0;
 567 
 568 out:
 569         destroy_mount_options(fsopt);
 570         return err;
 571 }
 572 
 573 /**
 574  * ceph_show_options - Show mount options in /proc/mounts
 575  * @m: seq_file to write to
 576  * @root: root of that (sub)tree
 577  */
 578 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 579 {
 580         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 581         struct ceph_mount_options *fsopt = fsc->mount_options;
 582         size_t pos;
 583         int ret;
 584 
 585         /* a comma between MNT/MS and client options */
 586         seq_putc(m, ',');
 587         pos = m->count;
 588 
 589         ret = ceph_print_client_options(m, fsc->client, false);
 590         if (ret)
 591                 return ret;
 592 
 593         /* retract our comma if no client options */
 594         if (m->count == pos)
 595                 m->count--;
 596 
 597         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 598                 seq_puts(m, ",dirstat");
 599         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 600                 seq_puts(m, ",rbytes");
 601         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 602                 seq_puts(m, ",noasyncreaddir");
 603         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 604                 seq_puts(m, ",nodcache");
 605         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 606                 seq_puts(m, ",ino32");
 607         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 608                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 609         }
 610         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 611                 seq_puts(m, ",nopoolperm");
 612         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 613                 seq_puts(m, ",noquotadf");
 614 
 615 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 616         if (fsopt->sb_flags & SB_POSIXACL)
 617                 seq_puts(m, ",acl");
 618         else
 619                 seq_puts(m, ",noacl");
 620 #endif
 621 
 622         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 623                 seq_puts(m, ",copyfrom");
 624 
 625         if (fsopt->mds_namespace)
 626                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 627 
 628         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 629                 seq_show_option(m, "recover_session", "clean");
 630 
 631         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 632                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 633         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 634                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 635         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 636                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 637         if (fsopt->congestion_kb != default_congestion_kb())
 638                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 639         if (fsopt->caps_max)
 640                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 641         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 642                 seq_printf(m, ",caps_wanted_delay_min=%d",
 643                          fsopt->caps_wanted_delay_min);
 644         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 645                 seq_printf(m, ",caps_wanted_delay_max=%d",
 646                            fsopt->caps_wanted_delay_max);
 647         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 648                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 649         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 650                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 651         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 652                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 653 
 654         return 0;
 655 }
 656 
 657 /*
 658  * handle any mon messages the standard library doesn't understand.
 659  * return error if we don't either.
 660  */
 661 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 662 {
 663         struct ceph_fs_client *fsc = client->private;
 664         int type = le16_to_cpu(msg->hdr.type);
 665 
 666         switch (type) {
 667         case CEPH_MSG_MDS_MAP:
 668                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 669                 return 0;
 670         case CEPH_MSG_FS_MAP_USER:
 671                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 672                 return 0;
 673         default:
 674                 return -1;
 675         }
 676 }
 677 
 678 /*
 679  * create a new fs client
 680  *
 681  * Success or not, this function consumes @fsopt and @opt.
 682  */
 683 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 684                                         struct ceph_options *opt)
 685 {
 686         struct ceph_fs_client *fsc;
 687         int page_count;
 688         size_t size;
 689         int err;
 690 
 691         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 692         if (!fsc) {
 693                 err = -ENOMEM;
 694                 goto fail;
 695         }
 696 
 697         fsc->client = ceph_create_client(opt, fsc);
 698         if (IS_ERR(fsc->client)) {
 699                 err = PTR_ERR(fsc->client);
 700                 goto fail;
 701         }
 702         opt = NULL; /* fsc->client now owns this */
 703 
 704         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 705         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 706 
 707         if (!fsopt->mds_namespace) {
 708                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 709                                    0, true);
 710         } else {
 711                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 712                                    0, false);
 713         }
 714 
 715         fsc->mount_options = fsopt;
 716 
 717         fsc->sb = NULL;
 718         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 719         fsc->filp_gen = 1;
 720 
 721         atomic_long_set(&fsc->writeback_count, 0);
 722 
 723         err = -ENOMEM;
 724         /*
 725          * The number of concurrent works can be high but they don't need
 726          * to be processed in parallel, limit concurrency.
 727          */
 728         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 729         if (!fsc->inode_wq)
 730                 goto fail_client;
 731         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 732         if (!fsc->cap_wq)
 733                 goto fail_inode_wq;
 734 
 735         /* set up mempools */
 736         err = -ENOMEM;
 737         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 738         size = sizeof (struct page *) * (page_count ? page_count : 1);
 739         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 740         if (!fsc->wb_pagevec_pool)
 741                 goto fail_cap_wq;
 742 
 743         return fsc;
 744 
 745 fail_cap_wq:
 746         destroy_workqueue(fsc->cap_wq);
 747 fail_inode_wq:
 748         destroy_workqueue(fsc->inode_wq);
 749 fail_client:
 750         ceph_destroy_client(fsc->client);
 751 fail:
 752         kfree(fsc);
 753         if (opt)
 754                 ceph_destroy_options(opt);
 755         destroy_mount_options(fsopt);
 756         return ERR_PTR(err);
 757 }
 758 
 759 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 760 {
 761         flush_workqueue(fsc->inode_wq);
 762         flush_workqueue(fsc->cap_wq);
 763 }
 764 
 765 static void destroy_fs_client(struct ceph_fs_client *fsc)
 766 {
 767         dout("destroy_fs_client %p\n", fsc);
 768 
 769         ceph_mdsc_destroy(fsc);
 770         destroy_workqueue(fsc->inode_wq);
 771         destroy_workqueue(fsc->cap_wq);
 772 
 773         mempool_destroy(fsc->wb_pagevec_pool);
 774 
 775         destroy_mount_options(fsc->mount_options);
 776 
 777         ceph_destroy_client(fsc->client);
 778 
 779         kfree(fsc);
 780         dout("destroy_fs_client %p done\n", fsc);
 781 }
 782 
 783 /*
 784  * caches
 785  */
 786 struct kmem_cache *ceph_inode_cachep;
 787 struct kmem_cache *ceph_cap_cachep;
 788 struct kmem_cache *ceph_cap_flush_cachep;
 789 struct kmem_cache *ceph_dentry_cachep;
 790 struct kmem_cache *ceph_file_cachep;
 791 struct kmem_cache *ceph_dir_file_cachep;
 792 
 793 static void ceph_inode_init_once(void *foo)
 794 {
 795         struct ceph_inode_info *ci = foo;
 796         inode_init_once(&ci->vfs_inode);
 797 }
 798 
 799 static int __init init_caches(void)
 800 {
 801         int error = -ENOMEM;
 802 
 803         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 804                                       sizeof(struct ceph_inode_info),
 805                                       __alignof__(struct ceph_inode_info),
 806                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 807                                       SLAB_ACCOUNT, ceph_inode_init_once);
 808         if (!ceph_inode_cachep)
 809                 return -ENOMEM;
 810 
 811         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 812         if (!ceph_cap_cachep)
 813                 goto bad_cap;
 814         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 815                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 816         if (!ceph_cap_flush_cachep)
 817                 goto bad_cap_flush;
 818 
 819         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 820                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 821         if (!ceph_dentry_cachep)
 822                 goto bad_dentry;
 823 
 824         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 825         if (!ceph_file_cachep)
 826                 goto bad_file;
 827 
 828         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 829         if (!ceph_dir_file_cachep)
 830                 goto bad_dir_file;
 831 
 832         error = ceph_fscache_register();
 833         if (error)
 834                 goto bad_fscache;
 835 
 836         return 0;
 837 
 838 bad_fscache:
 839         kmem_cache_destroy(ceph_dir_file_cachep);
 840 bad_dir_file:
 841         kmem_cache_destroy(ceph_file_cachep);
 842 bad_file:
 843         kmem_cache_destroy(ceph_dentry_cachep);
 844 bad_dentry:
 845         kmem_cache_destroy(ceph_cap_flush_cachep);
 846 bad_cap_flush:
 847         kmem_cache_destroy(ceph_cap_cachep);
 848 bad_cap:
 849         kmem_cache_destroy(ceph_inode_cachep);
 850         return error;
 851 }
 852 
 853 static void destroy_caches(void)
 854 {
 855         /*
 856          * Make sure all delayed rcu free inodes are flushed before we
 857          * destroy cache.
 858          */
 859         rcu_barrier();
 860 
 861         kmem_cache_destroy(ceph_inode_cachep);
 862         kmem_cache_destroy(ceph_cap_cachep);
 863         kmem_cache_destroy(ceph_cap_flush_cachep);
 864         kmem_cache_destroy(ceph_dentry_cachep);
 865         kmem_cache_destroy(ceph_file_cachep);
 866         kmem_cache_destroy(ceph_dir_file_cachep);
 867 
 868         ceph_fscache_unregister();
 869 }
 870 
 871 /*
 872  * ceph_umount_begin - initiate forced umount.  Tear down down the
 873  * mount, skipping steps that may hang while waiting for server(s).
 874  */
 875 static void ceph_umount_begin(struct super_block *sb)
 876 {
 877         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 878 
 879         dout("ceph_umount_begin - starting forced umount\n");
 880         if (!fsc)
 881                 return;
 882         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 883         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 884         ceph_mdsc_force_umount(fsc->mdsc);
 885         fsc->filp_gen++; // invalidate open files
 886 }
 887 
 888 static int ceph_remount(struct super_block *sb, int *flags, char *data)
 889 {
 890         sync_filesystem(sb);
 891         return 0;
 892 }
 893 
 894 static const struct super_operations ceph_super_ops = {
 895         .alloc_inode    = ceph_alloc_inode,
 896         .free_inode     = ceph_free_inode,
 897         .write_inode    = ceph_write_inode,
 898         .drop_inode     = generic_delete_inode,
 899         .evict_inode    = ceph_evict_inode,
 900         .sync_fs        = ceph_sync_fs,
 901         .put_super      = ceph_put_super,
 902         .remount_fs     = ceph_remount,
 903         .show_options   = ceph_show_options,
 904         .statfs         = ceph_statfs,
 905         .umount_begin   = ceph_umount_begin,
 906 };
 907 
 908 /*
 909  * Bootstrap mount by opening the root directory.  Note the mount
 910  * @started time from caller, and time out if this takes too long.
 911  */
 912 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 913                                        const char *path,
 914                                        unsigned long started)
 915 {
 916         struct ceph_mds_client *mdsc = fsc->mdsc;
 917         struct ceph_mds_request *req = NULL;
 918         int err;
 919         struct dentry *root;
 920 
 921         /* open dir */
 922         dout("open_root_inode opening '%s'\n", path);
 923         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 924         if (IS_ERR(req))
 925                 return ERR_CAST(req);
 926         req->r_path1 = kstrdup(path, GFP_NOFS);
 927         if (!req->r_path1) {
 928                 root = ERR_PTR(-ENOMEM);
 929                 goto out;
 930         }
 931 
 932         req->r_ino1.ino = CEPH_INO_ROOT;
 933         req->r_ino1.snap = CEPH_NOSNAP;
 934         req->r_started = started;
 935         req->r_timeout = fsc->client->options->mount_timeout;
 936         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 937         req->r_num_caps = 2;
 938         err = ceph_mdsc_do_request(mdsc, NULL, req);
 939         if (err == 0) {
 940                 struct inode *inode = req->r_target_inode;
 941                 req->r_target_inode = NULL;
 942                 dout("open_root_inode success\n");
 943                 root = d_make_root(inode);
 944                 if (!root) {
 945                         root = ERR_PTR(-ENOMEM);
 946                         goto out;
 947                 }
 948                 dout("open_root_inode success, root dentry is %p\n", root);
 949         } else {
 950                 root = ERR_PTR(err);
 951         }
 952 out:
 953         ceph_mdsc_put_request(req);
 954         return root;
 955 }
 956 
 957 /*
 958  * mount: join the ceph cluster, and open root directory.
 959  */
 960 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 961 {
 962         int err;
 963         unsigned long started = jiffies;  /* note the start time */
 964         struct dentry *root;
 965 
 966         dout("mount start %p\n", fsc);
 967         mutex_lock(&fsc->client->mount_mutex);
 968 
 969         if (!fsc->sb->s_root) {
 970                 const char *path = fsc->mount_options->server_path ?
 971                                      fsc->mount_options->server_path + 1 : "";
 972 
 973                 err = __ceph_open_session(fsc->client, started);
 974                 if (err < 0)
 975                         goto out;
 976 
 977                 /* setup fscache */
 978                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 979                         err = ceph_fscache_register_fs(fsc);
 980                         if (err < 0)
 981                                 goto out;
 982                 }
 983 
 984                 dout("mount opening path '%s'\n", path);
 985 
 986                 ceph_fs_debugfs_init(fsc);
 987 
 988                 root = open_root_dentry(fsc, path, started);
 989                 if (IS_ERR(root)) {
 990                         err = PTR_ERR(root);
 991                         goto out;
 992                 }
 993                 fsc->sb->s_root = dget(root);
 994         } else {
 995                 root = dget(fsc->sb->s_root);
 996         }
 997 
 998         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 999         dout("mount success\n");
1000         mutex_unlock(&fsc->client->mount_mutex);
1001         return root;
1002 
1003 out:
1004         mutex_unlock(&fsc->client->mount_mutex);
1005         return ERR_PTR(err);
1006 }
1007 
1008 static int ceph_set_super(struct super_block *s, void *data)
1009 {
1010         struct ceph_fs_client *fsc = data;
1011         int ret;
1012 
1013         dout("set_super %p data %p\n", s, data);
1014 
1015         s->s_flags = fsc->mount_options->sb_flags;
1016         s->s_maxbytes = MAX_LFS_FILESIZE;
1017 
1018         s->s_xattr = ceph_xattr_handlers;
1019         s->s_fs_info = fsc;
1020         fsc->sb = s;
1021         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1022 
1023         s->s_op = &ceph_super_ops;
1024         s->s_d_op = &ceph_dentry_ops;
1025         s->s_export_op = &ceph_export_ops;
1026 
1027         s->s_time_gran = 1;
1028         s->s_time_min = 0;
1029         s->s_time_max = U32_MAX;
1030 
1031         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
1032         if (ret != 0)
1033                 goto fail;
1034 
1035         return ret;
1036 
1037 fail:
1038         s->s_fs_info = NULL;
1039         fsc->sb = NULL;
1040         return ret;
1041 }
1042 
1043 /*
1044  * share superblock if same fs AND options
1045  */
1046 static int ceph_compare_super(struct super_block *sb, void *data)
1047 {
1048         struct ceph_fs_client *new = data;
1049         struct ceph_mount_options *fsopt = new->mount_options;
1050         struct ceph_options *opt = new->client->options;
1051         struct ceph_fs_client *other = ceph_sb_to_client(sb);
1052 
1053         dout("ceph_compare_super %p\n", sb);
1054 
1055         if (compare_mount_options(fsopt, opt, other)) {
1056                 dout("monitor(s)/mount options don't match\n");
1057                 return 0;
1058         }
1059         if ((opt->flags & CEPH_OPT_FSID) &&
1060             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1061                 dout("fsid doesn't match\n");
1062                 return 0;
1063         }
1064         if (fsopt->sb_flags != other->mount_options->sb_flags) {
1065                 dout("flags differ\n");
1066                 return 0;
1067         }
1068         return 1;
1069 }
1070 
1071 /*
1072  * construct our own bdi so we can control readahead, etc.
1073  */
1074 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1075 
1076 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1077 {
1078         int err;
1079 
1080         err = super_setup_bdi_name(sb, "ceph-%ld",
1081                                    atomic_long_inc_return(&bdi_seq));
1082         if (err)
1083                 return err;
1084 
1085         /* set ra_pages based on rasize mount option? */
1086         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1087 
1088         /* set io_pages based on max osd read size */
1089         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1090 
1091         return 0;
1092 }
1093 
1094 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1095                        int flags, const char *dev_name, void *data)
1096 {
1097         struct super_block *sb;
1098         struct ceph_fs_client *fsc;
1099         struct dentry *res;
1100         int err;
1101         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1102         struct ceph_mount_options *fsopt = NULL;
1103         struct ceph_options *opt = NULL;
1104 
1105         dout("ceph_mount\n");
1106 
1107 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1108         flags |= SB_POSIXACL;
1109 #endif
1110         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1111         if (err < 0) {
1112                 res = ERR_PTR(err);
1113                 goto out_final;
1114         }
1115 
1116         /* create client (which we may/may not use) */
1117         fsc = create_fs_client(fsopt, opt);
1118         if (IS_ERR(fsc)) {
1119                 res = ERR_CAST(fsc);
1120                 goto out_final;
1121         }
1122 
1123         err = ceph_mdsc_init(fsc);
1124         if (err < 0) {
1125                 res = ERR_PTR(err);
1126                 goto out;
1127         }
1128 
1129         if (ceph_test_opt(fsc->client, NOSHARE))
1130                 compare_super = NULL;
1131         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1132         if (IS_ERR(sb)) {
1133                 res = ERR_CAST(sb);
1134                 goto out;
1135         }
1136 
1137         if (ceph_sb_to_client(sb) != fsc) {
1138                 destroy_fs_client(fsc);
1139                 fsc = ceph_sb_to_client(sb);
1140                 dout("get_sb got existing client %p\n", fsc);
1141         } else {
1142                 dout("get_sb using new client %p\n", fsc);
1143                 err = ceph_setup_bdi(sb, fsc);
1144                 if (err < 0) {
1145                         res = ERR_PTR(err);
1146                         goto out_splat;
1147                 }
1148         }
1149 
1150         res = ceph_real_mount(fsc);
1151         if (IS_ERR(res))
1152                 goto out_splat;
1153         dout("root %p inode %p ino %llx.%llx\n", res,
1154              d_inode(res), ceph_vinop(d_inode(res)));
1155         return res;
1156 
1157 out_splat:
1158         if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1159                 pr_info("No mds server is up or the cluster is laggy\n");
1160                 err = -EHOSTUNREACH;
1161         }
1162 
1163         ceph_mdsc_close_sessions(fsc->mdsc);
1164         deactivate_locked_super(sb);
1165         goto out_final;
1166 
1167 out:
1168         destroy_fs_client(fsc);
1169 out_final:
1170         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1171         return res;
1172 }
1173 
1174 static void ceph_kill_sb(struct super_block *s)
1175 {
1176         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1177         dev_t dev = s->s_dev;
1178 
1179         dout("kill_sb %p\n", s);
1180 
1181         ceph_mdsc_pre_umount(fsc->mdsc);
1182         flush_fs_workqueues(fsc);
1183 
1184         generic_shutdown_super(s);
1185 
1186         fsc->client->extra_mon_dispatch = NULL;
1187         ceph_fs_debugfs_cleanup(fsc);
1188 
1189         ceph_fscache_unregister_fs(fsc);
1190 
1191         destroy_fs_client(fsc);
1192         free_anon_bdev(dev);
1193 }
1194 
1195 static struct file_system_type ceph_fs_type = {
1196         .owner          = THIS_MODULE,
1197         .name           = "ceph",
1198         .mount          = ceph_mount,
1199         .kill_sb        = ceph_kill_sb,
1200         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1201 };
1202 MODULE_ALIAS_FS("ceph");
1203 
1204 int ceph_force_reconnect(struct super_block *sb)
1205 {
1206         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1207         int err = 0;
1208 
1209         ceph_umount_begin(sb);
1210 
1211         /* Make sure all page caches get invalidated.
1212          * see remove_session_caps_cb() */
1213         flush_workqueue(fsc->inode_wq);
1214 
1215         /* In case that we were blacklisted. This also reset
1216          * all mon/osd connections */
1217         ceph_reset_client_addr(fsc->client);
1218 
1219         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1220 
1221         fsc->blacklisted = false;
1222         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1223 
1224         if (sb->s_root) {
1225                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1226                                         CEPH_STAT_CAP_INODE, true);
1227         }
1228         return err;
1229 }
1230 
1231 static int __init init_ceph(void)
1232 {
1233         int ret = init_caches();
1234         if (ret)
1235                 goto out;
1236 
1237         ceph_flock_init();
1238         ret = register_filesystem(&ceph_fs_type);
1239         if (ret)
1240                 goto out_caches;
1241 
1242         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1243 
1244         return 0;
1245 
1246 out_caches:
1247         destroy_caches();
1248 out:
1249         return ret;
1250 }
1251 
1252 static void __exit exit_ceph(void)
1253 {
1254         dout("exit_ceph\n");
1255         unregister_filesystem(&ceph_fs_type);
1256         destroy_caches();
1257 }
1258 
1259 module_init(init_ceph);
1260 module_exit(exit_ceph);
1261 
1262 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1263 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1264 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1265 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1266 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/fs/ceph/super.c

DEFINITIONS
