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