fs/ceph/super.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/backing-dev.h>
   5 #include <linux/ctype.h>
   6 #include <linux/fs.h>
   7 #include <linux/inet.h>
   8 #include <linux/in6.h>
   9 #include <linux/module.h>
  10 #include <linux/mount.h>
  11 #include <linux/parser.h>
  12 #include <linux/sched.h>
  13 #include <linux/seq_file.h>
  14 #include <linux/slab.h>
  15 #include <linux/statfs.h>
  16 #include <linux/string.h>
  17
  18 #include "super.h"
  19 #include "mds_client.h"
  20 #include "cache.h"
  21
  22 #include <linux/ceph/ceph_features.h>
  23 #include <linux/ceph/decode.h>
  24 #include <linux/ceph/mon_client.h>
  25 #include <linux/ceph/auth.h>
  26 #include <linux/ceph/debugfs.h>
  27
  28 /*
  29  * Ceph superblock operations
  30  *
  31  * Handle the basics of mounting, unmounting.
  32  */
  33
  34 /*
  35  * super ops
  36  */
  37 static void ceph_put_super(struct super_block *s)
  38 {
  39         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  40
  41         dout("put_super\n");
  42         ceph_mdsc_close_sessions(fsc->mdsc);
  43 }
  44
  45 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  46 {
  47         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  48         struct ceph_mon_client *monc = &fsc->client->monc;
  49         struct ceph_statfs st;
  50         u64 fsid;
  51         int err;
  52         u64 data_pool;
  53
  54         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  55                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  56         } else {
  57                 data_pool = CEPH_NOPOOL;
  58         }
  59
  60         dout("statfs\n");
  61         err = ceph_monc_do_statfs(monc, data_pool, &st);
  62         if (err < 0)
  63                 return err;
  64
  65         /* fill in kstatfs */
  66         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  67
  68         /*
  69          * express utilization in terms of large blocks to avoid
  70          * overflow on 32-bit machines.
  71          *
  72          * NOTE: for the time being, we make bsize == frsize to humor
  73          * not-yet-ancient versions of glibc that are broken.
  74          * Someday, we will probably want to report a real block
  75          * size...  whatever that may mean for a network file system!
  76          */
  77         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  78         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  79
  80         /*
  81          * By default use root quota for stats; fallback to overall filesystem
  82          * usage if using 'noquotadf' mount option or if the root dir doesn't
  83          * have max_bytes quota set.
  84          */
  85         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  86             !ceph_quota_update_statfs(fsc, buf)) {
  87                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  88                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  89                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  90         }
  91
  92         buf->f_files = le64_to_cpu(st.num_objects);
  93         buf->f_ffree = -1;
  94         buf->f_namelen = NAME_MAX;
  95
  96         /* Must convert the fsid, for consistent values across arches */
  97         mutex_lock(&monc->mutex);
  98         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
  99                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 100         mutex_unlock(&monc->mutex);
 101
 102         buf->f_fsid.val[0] = fsid & 0xffffffff;
 103         buf->f_fsid.val[1] = fsid >> 32;
 104
 105         return 0;
 106 }
 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_readdir_max_entries,
 137         Opt_readdir_max_bytes,
 138         Opt_congestion_kb,
 139         Opt_last_int,
 140         /* int args above */
 141         Opt_snapdirname,
 142         Opt_mds_namespace,
 143         Opt_fscache_uniq,
 144         Opt_last_string,
 145         /* string args above */
 146         Opt_dirstat,
 147         Opt_nodirstat,
 148         Opt_rbytes,
 149         Opt_norbytes,
 150         Opt_asyncreaddir,
 151         Opt_noasyncreaddir,
 152         Opt_dcache,
 153         Opt_nodcache,
 154         Opt_ino32,
 155         Opt_noino32,
 156         Opt_fscache,
 157         Opt_nofscache,
 158         Opt_poolperm,
 159         Opt_nopoolperm,
 160         Opt_require_active_mds,
 161         Opt_norequire_active_mds,
 162 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 163         Opt_acl,
 164 #endif
 165         Opt_noacl,
 166         Opt_quotadf,
 167         Opt_noquotadf,
 168 };
 169
 170 static match_table_t fsopt_tokens = {
 171         {Opt_wsize, "wsize=%d"},
 172         {Opt_rsize, "rsize=%d"},
 173         {Opt_rasize, "rasize=%d"},
 174         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 175         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 176         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 177         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 178         {Opt_congestion_kb, "write_congestion_kb=%d"},
 179         /* int args above */
 180         {Opt_snapdirname, "snapdirname=%s"},
 181         {Opt_mds_namespace, "mds_namespace=%s"},
 182         {Opt_fscache_uniq, "fsc=%s"},
 183         /* string args above */
 184         {Opt_dirstat, "dirstat"},
 185         {Opt_nodirstat, "nodirstat"},
 186         {Opt_rbytes, "rbytes"},
 187         {Opt_norbytes, "norbytes"},
 188         {Opt_asyncreaddir, "asyncreaddir"},
 189         {Opt_noasyncreaddir, "noasyncreaddir"},
 190         {Opt_dcache, "dcache"},
 191         {Opt_nodcache, "nodcache"},
 192         {Opt_ino32, "ino32"},
 193         {Opt_noino32, "noino32"},
 194         {Opt_fscache, "fsc"},
 195         {Opt_nofscache, "nofsc"},
 196         {Opt_poolperm, "poolperm"},
 197         {Opt_nopoolperm, "nopoolperm"},
 198         {Opt_require_active_mds, "require_active_mds"},
 199         {Opt_norequire_active_mds, "norequire_active_mds"},
 200 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 201         {Opt_acl, "acl"},
 202 #endif
 203         {Opt_noacl, "noacl"},
 204         {Opt_quotadf, "quotadf"},
 205         {Opt_noquotadf, "noquotadf"},
 206         {-1, NULL}
 207 };
 208
 209 static int parse_fsopt_token(char *c, void *private)
 210 {
 211         struct ceph_mount_options *fsopt = private;
 212         substring_t argstr[MAX_OPT_ARGS];
 213         int token, intval, ret;
 214
 215         token = match_token((char *)c, fsopt_tokens, argstr);
 216         if (token < 0)
 217                 return -EINVAL;
 218
 219         if (token < Opt_last_int) {
 220                 ret = match_int(&argstr[0], &intval);
 221                 if (ret < 0) {
 222                         pr_err("bad option arg (not int) at '%s'\n", c);
 223                         return ret;
 224                 }
 225                 dout("got int token %d val %d\n", token, intval);
 226         } else if (token > Opt_last_int && token < Opt_last_string) {
 227                 dout("got string token %d val %s\n", token,
 228                      argstr[0].from);
 229         } else {
 230                 dout("got token %d\n", token);
 231         }
 232
 233         switch (token) {
 234         case Opt_snapdirname:
 235                 kfree(fsopt->snapdir_name);
 236                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 237                                                argstr[0].to-argstr[0].from,
 238                                                GFP_KERNEL);
 239                 if (!fsopt->snapdir_name)
 240                         return -ENOMEM;
 241                 break;
 242         case Opt_mds_namespace:
 243                 kfree(fsopt->mds_namespace);
 244                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 245                                                 argstr[0].to-argstr[0].from,
 246                                                 GFP_KERNEL);
 247                 if (!fsopt->mds_namespace)
 248                         return -ENOMEM;
 249                 break;
 250         case Opt_fscache_uniq:
 251                 kfree(fsopt->fscache_uniq);
 252                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 253                                                argstr[0].to-argstr[0].from,
 254                                                GFP_KERNEL);
 255                 if (!fsopt->fscache_uniq)
 256                         return -ENOMEM;
 257                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 258                 break;
 259                 /* misc */
 260         case Opt_wsize:
 261                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 262                         return -EINVAL;
 263                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 264                 break;
 265         case Opt_rsize:
 266                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 267                         return -EINVAL;
 268                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 269                 break;
 270         case Opt_rasize:
 271                 if (intval < 0)
 272                         return -EINVAL;
 273                 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
 274                 break;
 275         case Opt_caps_wanted_delay_min:
 276                 if (intval < 1)
 277                         return -EINVAL;
 278                 fsopt->caps_wanted_delay_min = intval;
 279                 break;
 280         case Opt_caps_wanted_delay_max:
 281                 if (intval < 1)
 282                         return -EINVAL;
 283                 fsopt->caps_wanted_delay_max = intval;
 284                 break;
 285         case Opt_readdir_max_entries:
 286                 if (intval < 1)
 287                         return -EINVAL;
 288                 fsopt->max_readdir = intval;
 289                 break;
 290         case Opt_readdir_max_bytes:
 291                 if (intval < (int)PAGE_SIZE && intval != 0)
 292                         return -EINVAL;
 293                 fsopt->max_readdir_bytes = intval;
 294                 break;
 295         case Opt_congestion_kb:
 296                 if (intval < 1024) /* at least 1M */
 297                         return -EINVAL;
 298                 fsopt->congestion_kb = intval;
 299                 break;
 300         case Opt_dirstat:
 301                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 302                 break;
 303         case Opt_nodirstat:
 304                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 305                 break;
 306         case Opt_rbytes:
 307                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 308                 break;
 309         case Opt_norbytes:
 310                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 311                 break;
 312         case Opt_asyncreaddir:
 313                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 314                 break;
 315         case Opt_noasyncreaddir:
 316                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 317                 break;
 318         case Opt_dcache:
 319                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 320                 break;
 321         case Opt_nodcache:
 322                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 323                 break;
 324         case Opt_ino32:
 325                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 326                 break;
 327         case Opt_noino32:
 328                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 329                 break;
 330         case Opt_fscache:
 331                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 332                 kfree(fsopt->fscache_uniq);
 333                 fsopt->fscache_uniq = NULL;
 334                 break;
 335         case Opt_nofscache:
 336                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 337                 kfree(fsopt->fscache_uniq);
 338                 fsopt->fscache_uniq = NULL;
 339                 break;
 340         case Opt_poolperm:
 341                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 342                 break;
 343         case Opt_nopoolperm:
 344                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 345                 break;
 346         case Opt_require_active_mds:
 347                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 348                 break;
 349         case Opt_norequire_active_mds:
 350                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 351                 break;
 352         case Opt_quotadf:
 353                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 354                 break;
 355         case Opt_noquotadf:
 356                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 357                 break;
 358 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 359         case Opt_acl:
 360                 fsopt->sb_flags |= SB_POSIXACL;
 361                 break;
 362 #endif
 363         case Opt_noacl:
 364                 fsopt->sb_flags &= ~SB_POSIXACL;
 365                 break;
 366         default:
 367                 BUG_ON(token);
 368         }
 369         return 0;
 370 }
 371
 372 static void destroy_mount_options(struct ceph_mount_options *args)
 373 {
 374         dout("destroy_mount_options %p\n", args);
 375         kfree(args->snapdir_name);
 376         kfree(args->mds_namespace);
 377         kfree(args->server_path);
 378         kfree(args->fscache_uniq);
 379         kfree(args);
 380 }
 381
 382 static int strcmp_null(const char *s1, const char *s2)
 383 {
 384         if (!s1 && !s2)
 385                 return 0;
 386         if (s1 && !s2)
 387                 return -1;
 388         if (!s1 && s2)
 389                 return 1;
 390         return strcmp(s1, s2);
 391 }
 392
 393 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 394                                  struct ceph_options *new_opt,
 395                                  struct ceph_fs_client *fsc)
 396 {
 397         struct ceph_mount_options *fsopt1 = new_fsopt;
 398         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 399         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 400         int ret;
 401
 402         ret = memcmp(fsopt1, fsopt2, ofs);
 403         if (ret)
 404                 return ret;
 405
 406         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 407         if (ret)
 408                 return ret;
 409         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 410         if (ret)
 411                 return ret;
 412         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 413         if (ret)
 414                 return ret;
 415         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 416         if (ret)
 417                 return ret;
 418
 419         return ceph_compare_options(new_opt, fsc->client);
 420 }
 421
 422 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 423                                struct ceph_options **popt,
 424                                int flags, char *options,
 425                                const char *dev_name)
 426 {
 427         struct ceph_mount_options *fsopt;
 428         const char *dev_name_end;
 429         int err;
 430
 431         if (!dev_name || !*dev_name)
 432                 return -EINVAL;
 433
 434         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 435         if (!fsopt)
 436                 return -ENOMEM;
 437
 438         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 439
 440         fsopt->sb_flags = flags;
 441         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 442
 443         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 444         fsopt->rsize = CEPH_MAX_READ_SIZE;
 445         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 446         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 447         if (!fsopt->snapdir_name) {
 448                 err = -ENOMEM;
 449                 goto out;
 450         }
 451
 452         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 453         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 454         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 455         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 456         fsopt->congestion_kb = default_congestion_kb();
 457
 458         /*
 459          * Distinguish the server list from the path in "dev_name".
 460          * Internally we do not include the leading '/' in the path.
 461          *
 462          * "dev_name" will look like:
 463          *     <server_spec>[,<server_spec>...]:[<path>]
 464          * where
 465          *     <server_spec> is <ip>[:<port>]
 466          *     <path> is optional, but if present must begin with '/'
 467          */
 468         dev_name_end = strchr(dev_name, '/');
 469         if (dev_name_end) {
 470                 if (strlen(dev_name_end) > 1) {
 471                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 472                         if (!fsopt->server_path) {
 473                                 err = -ENOMEM;
 474                                 goto out;
 475                         }
 476                 }
 477         } else {
 478                 dev_name_end = dev_name + strlen(dev_name);
 479         }
 480         err = -EINVAL;
 481         dev_name_end--;         /* back up to ':' separator */
 482         if (dev_name_end < dev_name || *dev_name_end != ':') {
 483                 pr_err("device name is missing path (no : separator in %s)\n",
 484                                 dev_name);
 485                 goto out;
 486         }
 487         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 488         if (fsopt->server_path)
 489                 dout("server path '%s'\n", fsopt->server_path);
 490
 491         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 492                                  parse_fsopt_token, (void *)fsopt);
 493         if (IS_ERR(*popt)) {
 494                 err = PTR_ERR(*popt);
 495                 goto out;
 496         }
 497
 498         /* success */
 499         *pfsopt = fsopt;
 500         return 0;
 501
 502 out:
 503         destroy_mount_options(fsopt);
 504         return err;
 505 }
 506
 507 /**
 508  * ceph_show_options - Show mount options in /proc/mounts
 509  * @m: seq_file to write to
 510  * @root: root of that (sub)tree
 511  */
 512 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 513 {
 514         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 515         struct ceph_mount_options *fsopt = fsc->mount_options;
 516         size_t pos;
 517         int ret;
 518
 519         /* a comma between MNT/MS and client options */
 520         seq_putc(m, ',');
 521         pos = m->count;
 522
 523         ret = ceph_print_client_options(m, fsc->client);
 524         if (ret)
 525                 return ret;
 526
 527         /* retract our comma if no client options */
 528         if (m->count == pos)
 529                 m->count--;
 530
 531         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 532                 seq_puts(m, ",dirstat");
 533         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 534                 seq_puts(m, ",rbytes");
 535         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 536                 seq_puts(m, ",noasyncreaddir");
 537         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 538                 seq_puts(m, ",nodcache");
 539         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 540                 seq_puts(m, ",ino32");
 541         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 542                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 543         }
 544         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 545                 seq_puts(m, ",nopoolperm");
 546         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 547                 seq_puts(m, ",noquotadf");
 548
 549 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 550         if (fsopt->sb_flags & SB_POSIXACL)
 551                 seq_puts(m, ",acl");
 552         else
 553                 seq_puts(m, ",noacl");
 554 #endif
 555
 556         if (fsopt->mds_namespace)
 557                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 558         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 559                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 560         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 561                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 562         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 563                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 564         if (fsopt->congestion_kb != default_congestion_kb())
 565                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 566         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 567                 seq_printf(m, ",caps_wanted_delay_min=%d",
 568                          fsopt->caps_wanted_delay_min);
 569         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 570                 seq_printf(m, ",caps_wanted_delay_max=%d",
 571                            fsopt->caps_wanted_delay_max);
 572         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 573                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 574         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 575                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 576         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 577                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 578
 579         return 0;
 580 }
 581
 582 /*
 583  * handle any mon messages the standard library doesn't understand.
 584  * return error if we don't either.
 585  */
 586 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 587 {
 588         struct ceph_fs_client *fsc = client->private;
 589         int type = le16_to_cpu(msg->hdr.type);
 590
 591         switch (type) {
 592         case CEPH_MSG_MDS_MAP:
 593                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 594                 return 0;
 595         case CEPH_MSG_FS_MAP_USER:
 596                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 597                 return 0;
 598         default:
 599                 return -1;
 600         }
 601 }
 602
 603 /*
 604  * create a new fs client
 605  *
 606  * Success or not, this function consumes @fsopt and @opt.
 607  */
 608 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 609                                         struct ceph_options *opt)
 610 {
 611         struct ceph_fs_client *fsc;
 612         int page_count;
 613         size_t size;
 614         int err;
 615
 616         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 617         if (!fsc) {
 618                 err = -ENOMEM;
 619                 goto fail;
 620         }
 621
 622         fsc->client = ceph_create_client(opt, fsc);
 623         if (IS_ERR(fsc->client)) {
 624                 err = PTR_ERR(fsc->client);
 625                 goto fail;
 626         }
 627         opt = NULL; /* fsc->client now owns this */
 628
 629         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 630         fsc->client->osdc.abort_on_full = true;
 631
 632         if (!fsopt->mds_namespace) {
 633                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 634                                    0, true);
 635         } else {
 636                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 637                                    0, false);
 638         }
 639
 640         fsc->mount_options = fsopt;
 641
 642         fsc->sb = NULL;
 643         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 644
 645         atomic_long_set(&fsc->writeback_count, 0);
 646
 647         err = -ENOMEM;
 648         /*
 649          * The number of concurrent works can be high but they don't need
 650          * to be processed in parallel, limit concurrency.
 651          */
 652         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 653         if (!fsc->wb_wq)
 654                 goto fail_client;
 655         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 656         if (!fsc->pg_inv_wq)
 657                 goto fail_wb_wq;
 658         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 659         if (!fsc->trunc_wq)
 660                 goto fail_pg_inv_wq;
 661
 662         /* set up mempools */
 663         err = -ENOMEM;
 664         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 665         size = sizeof (struct page *) * (page_count ? page_count : 1);
 666         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 667         if (!fsc->wb_pagevec_pool)
 668                 goto fail_trunc_wq;
 669
 670         /* caps */
 671         fsc->min_caps = fsopt->max_readdir;
 672
 673         return fsc;
 674
 675 fail_trunc_wq:
 676         destroy_workqueue(fsc->trunc_wq);
 677 fail_pg_inv_wq:
 678         destroy_workqueue(fsc->pg_inv_wq);
 679 fail_wb_wq:
 680         destroy_workqueue(fsc->wb_wq);
 681 fail_client:
 682         ceph_destroy_client(fsc->client);
 683 fail:
 684         kfree(fsc);
 685         if (opt)
 686                 ceph_destroy_options(opt);
 687         destroy_mount_options(fsopt);
 688         return ERR_PTR(err);
 689 }
 690
 691 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 692 {
 693         flush_workqueue(fsc->wb_wq);
 694         flush_workqueue(fsc->pg_inv_wq);
 695         flush_workqueue(fsc->trunc_wq);
 696 }
 697
 698 static void destroy_fs_client(struct ceph_fs_client *fsc)
 699 {
 700         dout("destroy_fs_client %p\n", fsc);
 701
 702         destroy_workqueue(fsc->wb_wq);
 703         destroy_workqueue(fsc->pg_inv_wq);
 704         destroy_workqueue(fsc->trunc_wq);
 705
 706         mempool_destroy(fsc->wb_pagevec_pool);
 707
 708         destroy_mount_options(fsc->mount_options);
 709
 710         ceph_destroy_client(fsc->client);
 711
 712         kfree(fsc);
 713         dout("destroy_fs_client %p done\n", fsc);
 714 }
 715
 716 /*
 717  * caches
 718  */
 719 struct kmem_cache *ceph_inode_cachep;
 720 struct kmem_cache *ceph_cap_cachep;
 721 struct kmem_cache *ceph_cap_flush_cachep;
 722 struct kmem_cache *ceph_dentry_cachep;
 723 struct kmem_cache *ceph_file_cachep;
 724 struct kmem_cache *ceph_dir_file_cachep;
 725
 726 static void ceph_inode_init_once(void *foo)
 727 {
 728         struct ceph_inode_info *ci = foo;
 729         inode_init_once(&ci->vfs_inode);
 730 }
 731
 732 static int __init init_caches(void)
 733 {
 734         int error = -ENOMEM;
 735
 736         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 737                                       sizeof(struct ceph_inode_info),
 738                                       __alignof__(struct ceph_inode_info),
 739                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 740                                       SLAB_ACCOUNT, ceph_inode_init_once);
 741         if (!ceph_inode_cachep)
 742                 return -ENOMEM;
 743
 744         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 745         if (!ceph_cap_cachep)
 746                 goto bad_cap;
 747         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 748                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 749         if (!ceph_cap_flush_cachep)
 750                 goto bad_cap_flush;
 751
 752         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 753                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 754         if (!ceph_dentry_cachep)
 755                 goto bad_dentry;
 756
 757         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 758         if (!ceph_file_cachep)
 759                 goto bad_file;
 760
 761         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 762         if (!ceph_dir_file_cachep)
 763                 goto bad_dir_file;
 764
 765         error = ceph_fscache_register();
 766         if (error)
 767                 goto bad_fscache;
 768
 769         return 0;
 770
 771 bad_fscache:
 772         kmem_cache_destroy(ceph_dir_file_cachep);
 773 bad_dir_file:
 774         kmem_cache_destroy(ceph_file_cachep);
 775 bad_file:
 776         kmem_cache_destroy(ceph_dentry_cachep);
 777 bad_dentry:
 778         kmem_cache_destroy(ceph_cap_flush_cachep);
 779 bad_cap_flush:
 780         kmem_cache_destroy(ceph_cap_cachep);
 781 bad_cap:
 782         kmem_cache_destroy(ceph_inode_cachep);
 783         return error;
 784 }
 785
 786 static void destroy_caches(void)
 787 {
 788         /*
 789          * Make sure all delayed rcu free inodes are flushed before we
 790          * destroy cache.
 791          */
 792         rcu_barrier();
 793
 794         kmem_cache_destroy(ceph_inode_cachep);
 795         kmem_cache_destroy(ceph_cap_cachep);
 796         kmem_cache_destroy(ceph_cap_flush_cachep);
 797         kmem_cache_destroy(ceph_dentry_cachep);
 798         kmem_cache_destroy(ceph_file_cachep);
 799         kmem_cache_destroy(ceph_dir_file_cachep);
 800
 801         ceph_fscache_unregister();
 802 }
 803
 804
 805 /*
 806  * ceph_umount_begin - initiate forced umount.  Tear down down the
 807  * mount, skipping steps that may hang while waiting for server(s).
 808  */
 809 static void ceph_umount_begin(struct super_block *sb)
 810 {
 811         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 812
 813         dout("ceph_umount_begin - starting forced umount\n");
 814         if (!fsc)
 815                 return;
 816         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 817         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 818         ceph_mdsc_force_umount(fsc->mdsc);
 819         return;
 820 }
 821
 822 static const struct super_operations ceph_super_ops = {
 823         .alloc_inode    = ceph_alloc_inode,
 824         .destroy_inode  = ceph_destroy_inode,
 825         .write_inode    = ceph_write_inode,
 826         .drop_inode     = ceph_drop_inode,
 827         .sync_fs        = ceph_sync_fs,
 828         .put_super      = ceph_put_super,
 829         .show_options   = ceph_show_options,
 830         .statfs         = ceph_statfs,
 831         .umount_begin   = ceph_umount_begin,
 832 };
 833
 834 /*
 835  * Bootstrap mount by opening the root directory.  Note the mount
 836  * @started time from caller, and time out if this takes too long.
 837  */
 838 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 839                                        const char *path,
 840                                        unsigned long started)
 841 {
 842         struct ceph_mds_client *mdsc = fsc->mdsc;
 843         struct ceph_mds_request *req = NULL;
 844         int err;
 845         struct dentry *root;
 846
 847         /* open dir */
 848         dout("open_root_inode opening '%s'\n", path);
 849         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 850         if (IS_ERR(req))
 851                 return ERR_CAST(req);
 852         req->r_path1 = kstrdup(path, GFP_NOFS);
 853         if (!req->r_path1) {
 854                 root = ERR_PTR(-ENOMEM);
 855                 goto out;
 856         }
 857
 858         req->r_ino1.ino = CEPH_INO_ROOT;
 859         req->r_ino1.snap = CEPH_NOSNAP;
 860         req->r_started = started;
 861         req->r_timeout = fsc->client->options->mount_timeout;
 862         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 863         req->r_num_caps = 2;
 864         err = ceph_mdsc_do_request(mdsc, NULL, req);
 865         if (err == 0) {
 866                 struct inode *inode = req->r_target_inode;
 867                 req->r_target_inode = NULL;
 868                 dout("open_root_inode success\n");
 869                 root = d_make_root(inode);
 870                 if (!root) {
 871                         root = ERR_PTR(-ENOMEM);
 872                         goto out;
 873                 }
 874                 dout("open_root_inode success, root dentry is %p\n", root);
 875         } else {
 876                 root = ERR_PTR(err);
 877         }
 878 out:
 879         ceph_mdsc_put_request(req);
 880         return root;
 881 }
 882
 883
 884
 885
 886 /*
 887  * mount: join the ceph cluster, and open root directory.
 888  */
 889 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 890 {
 891         int err;
 892         unsigned long started = jiffies;  /* note the start time */
 893         struct dentry *root;
 894
 895         dout("mount start %p\n", fsc);
 896         mutex_lock(&fsc->client->mount_mutex);
 897
 898         if (!fsc->sb->s_root) {
 899                 const char *path;
 900                 err = __ceph_open_session(fsc->client, started);
 901                 if (err < 0)
 902                         goto out;
 903
 904                 /* setup fscache */
 905                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 906                         err = ceph_fscache_register_fs(fsc);
 907                         if (err < 0)
 908                                 goto out;
 909                 }
 910
 911                 if (!fsc->mount_options->server_path) {
 912                         path = "";
 913                         dout("mount opening path \\t\n");
 914                 } else {
 915                         path = fsc->mount_options->server_path + 1;
 916                         dout("mount opening path %s\n", path);
 917                 }
 918
 919                 err = ceph_fs_debugfs_init(fsc);
 920                 if (err < 0)
 921                         goto out;
 922
 923                 root = open_root_dentry(fsc, path, started);
 924                 if (IS_ERR(root)) {
 925                         err = PTR_ERR(root);
 926                         goto out;
 927                 }
 928                 fsc->sb->s_root = dget(root);
 929         } else {
 930                 root = dget(fsc->sb->s_root);
 931         }
 932
 933         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 934         dout("mount success\n");
 935         mutex_unlock(&fsc->client->mount_mutex);
 936         return root;
 937
 938 out:
 939         mutex_unlock(&fsc->client->mount_mutex);
 940         return ERR_PTR(err);
 941 }
 942
 943 static int ceph_set_super(struct super_block *s, void *data)
 944 {
 945         struct ceph_fs_client *fsc = data;
 946         int ret;
 947
 948         dout("set_super %p data %p\n", s, data);
 949
 950         s->s_flags = fsc->mount_options->sb_flags;
 951         s->s_maxbytes = MAX_LFS_FILESIZE;
 952
 953         s->s_xattr = ceph_xattr_handlers;
 954         s->s_fs_info = fsc;
 955         fsc->sb = s;
 956         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 957
 958         s->s_op = &ceph_super_ops;
 959         s->s_d_op = &ceph_dentry_ops;
 960         s->s_export_op = &ceph_export_ops;
 961
 962         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 963
 964         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 965         if (ret != 0)
 966                 goto fail;
 967
 968         return ret;
 969
 970 fail:
 971         s->s_fs_info = NULL;
 972         fsc->sb = NULL;
 973         return ret;
 974 }
 975
 976 /*
 977  * share superblock if same fs AND options
 978  */
 979 static int ceph_compare_super(struct super_block *sb, void *data)
 980 {
 981         struct ceph_fs_client *new = data;
 982         struct ceph_mount_options *fsopt = new->mount_options;
 983         struct ceph_options *opt = new->client->options;
 984         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 985
 986         dout("ceph_compare_super %p\n", sb);
 987
 988         if (compare_mount_options(fsopt, opt, other)) {
 989                 dout("monitor(s)/mount options don't match\n");
 990                 return 0;
 991         }
 992         if ((opt->flags & CEPH_OPT_FSID) &&
 993             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 994                 dout("fsid doesn't match\n");
 995                 return 0;
 996         }
 997         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 998                 dout("flags differ\n");
 999                 return 0;
1000         }
1001         return 1;
1002 }
1003
1004 /*
1005  * construct our own bdi so we can control readahead, etc.
1006  */
1007 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1008
1009 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1010 {
1011         int err;
1012
1013         err = super_setup_bdi_name(sb, "ceph-%ld",
1014                                    atomic_long_inc_return(&bdi_seq));
1015         if (err)
1016                 return err;
1017
1018         /* set ra_pages based on rasize mount option? */
1019         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1020
1021         /* set io_pages based on max osd read size */
1022         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1023
1024         return 0;
1025 }
1026
1027 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1028                        int flags, const char *dev_name, void *data)
1029 {
1030         struct super_block *sb;
1031         struct ceph_fs_client *fsc;
1032         struct dentry *res;
1033         int err;
1034         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1035         struct ceph_mount_options *fsopt = NULL;
1036         struct ceph_options *opt = NULL;
1037
1038         dout("ceph_mount\n");
1039
1040 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1041         flags |= SB_POSIXACL;
1042 #endif
1043         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1044         if (err < 0) {
1045                 res = ERR_PTR(err);
1046                 goto out_final;
1047         }
1048
1049         /* create client (which we may/may not use) */
1050         fsc = create_fs_client(fsopt, opt);
1051         if (IS_ERR(fsc)) {
1052                 res = ERR_CAST(fsc);
1053                 goto out_final;
1054         }
1055
1056         err = ceph_mdsc_init(fsc);
1057         if (err < 0) {
1058                 res = ERR_PTR(err);
1059                 goto out;
1060         }
1061
1062         if (ceph_test_opt(fsc->client, NOSHARE))
1063                 compare_super = NULL;
1064         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1065         if (IS_ERR(sb)) {
1066                 res = ERR_CAST(sb);
1067                 goto out;
1068         }
1069
1070         if (ceph_sb_to_client(sb) != fsc) {
1071                 ceph_mdsc_destroy(fsc);
1072                 destroy_fs_client(fsc);
1073                 fsc = ceph_sb_to_client(sb);
1074                 dout("get_sb got existing client %p\n", fsc);
1075         } else {
1076                 dout("get_sb using new client %p\n", fsc);
1077                 err = ceph_setup_bdi(sb, fsc);
1078                 if (err < 0) {
1079                         res = ERR_PTR(err);
1080                         goto out_splat;
1081                 }
1082         }
1083
1084         res = ceph_real_mount(fsc);
1085         if (IS_ERR(res))
1086                 goto out_splat;
1087         dout("root %p inode %p ino %llx.%llx\n", res,
1088              d_inode(res), ceph_vinop(d_inode(res)));
1089         return res;
1090
1091 out_splat:
1092         ceph_mdsc_close_sessions(fsc->mdsc);
1093         deactivate_locked_super(sb);
1094         goto out_final;
1095
1096 out:
1097         ceph_mdsc_destroy(fsc);
1098         destroy_fs_client(fsc);
1099 out_final:
1100         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1101         return res;
1102 }
1103
1104 static void ceph_kill_sb(struct super_block *s)
1105 {
1106         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1107         dev_t dev = s->s_dev;
1108
1109         dout("kill_sb %p\n", s);
1110
1111         ceph_mdsc_pre_umount(fsc->mdsc);
1112         flush_fs_workqueues(fsc);
1113
1114         generic_shutdown_super(s);
1115
1116         fsc->client->extra_mon_dispatch = NULL;
1117         ceph_fs_debugfs_cleanup(fsc);
1118
1119         ceph_fscache_unregister_fs(fsc);
1120
1121         ceph_mdsc_destroy(fsc);
1122
1123         destroy_fs_client(fsc);
1124         free_anon_bdev(dev);
1125 }
1126
1127 static struct file_system_type ceph_fs_type = {
1128         .owner          = THIS_MODULE,
1129         .name           = "ceph",
1130         .mount          = ceph_mount,
1131         .kill_sb        = ceph_kill_sb,
1132         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1133 };
1134 MODULE_ALIAS_FS("ceph");
1135
1136 static int __init init_ceph(void)
1137 {
1138         int ret = init_caches();
1139         if (ret)
1140                 goto out;
1141
1142         ceph_flock_init();
1143         ceph_xattr_init();
1144         ret = register_filesystem(&ceph_fs_type);
1145         if (ret)
1146                 goto out_xattr;
1147
1148         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1149
1150         return 0;
1151
1152 out_xattr:
1153         ceph_xattr_exit();
1154         destroy_caches();
1155 out:
1156         return ret;
1157 }
1158
1159 static void __exit exit_ceph(void)
1160 {
1161         dout("exit_ceph\n");
1162         unregister_filesystem(&ceph_fs_type);
1163         ceph_xattr_exit();
1164         destroy_caches();
1165 }
1166
1167 module_init(init_ceph);
1168 module_exit(exit_ceph);
1169
1170 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1171 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1172 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1173 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1174 MODULE_LICENSE("GPL");