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 < 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 < 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 < 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_FSCACHE) {
 541                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 542         }
 543         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 544                 seq_puts(m, ",nopoolperm");
 545         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 546                 seq_puts(m, ",noquotadf");
 547
 548 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 549         if (fsopt->sb_flags & SB_POSIXACL)
 550                 seq_puts(m, ",acl");
 551         else
 552                 seq_puts(m, ",noacl");
 553 #endif
 554
 555         if (fsopt->mds_namespace)
 556                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 557         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 558                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 559         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 560                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 561         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 562                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 563         if (fsopt->congestion_kb != default_congestion_kb())
 564                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 565         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 566                 seq_printf(m, ",caps_wanted_delay_min=%d",
 567                          fsopt->caps_wanted_delay_min);
 568         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 569                 seq_printf(m, ",caps_wanted_delay_max=%d",
 570                            fsopt->caps_wanted_delay_max);
 571         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 572                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 573         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 574                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 575         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 576                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 577
 578         return 0;
 579 }
 580
 581 /*
 582  * handle any mon messages the standard library doesn't understand.
 583  * return error if we don't either.
 584  */
 585 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 586 {
 587         struct ceph_fs_client *fsc = client->private;
 588         int type = le16_to_cpu(msg->hdr.type);
 589
 590         switch (type) {
 591         case CEPH_MSG_MDS_MAP:
 592                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 593                 return 0;
 594         case CEPH_MSG_FS_MAP_USER:
 595                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 596                 return 0;
 597         default:
 598                 return -1;
 599         }
 600 }
 601
 602 /*
 603  * create a new fs client
 604  */
 605 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 606                                         struct ceph_options *opt)
 607 {
 608         struct ceph_fs_client *fsc;
 609         int page_count;
 610         size_t size;
 611         int err = -ENOMEM;
 612
 613         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 614         if (!fsc)
 615                 return ERR_PTR(-ENOMEM);
 616
 617         fsc->client = ceph_create_client(opt, fsc);
 618         if (IS_ERR(fsc->client)) {
 619                 err = PTR_ERR(fsc->client);
 620                 goto fail;
 621         }
 622
 623         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 624         fsc->client->osdc.abort_on_full = true;
 625
 626         if (!fsopt->mds_namespace) {
 627                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 628                                    0, true);
 629         } else {
 630                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 631                                    0, false);
 632         }
 633
 634         fsc->mount_options = fsopt;
 635
 636         fsc->sb = NULL;
 637         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 638
 639         atomic_long_set(&fsc->writeback_count, 0);
 640
 641         err = -ENOMEM;
 642         /*
 643          * The number of concurrent works can be high but they don't need
 644          * to be processed in parallel, limit concurrency.
 645          */
 646         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 647         if (!fsc->wb_wq)
 648                 goto fail_client;
 649         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 650         if (!fsc->pg_inv_wq)
 651                 goto fail_wb_wq;
 652         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 653         if (!fsc->trunc_wq)
 654                 goto fail_pg_inv_wq;
 655
 656         /* set up mempools */
 657         err = -ENOMEM;
 658         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 659         size = sizeof (struct page *) * (page_count ? page_count : 1);
 660         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 661         if (!fsc->wb_pagevec_pool)
 662                 goto fail_trunc_wq;
 663
 664         /* caps */
 665         fsc->min_caps = fsopt->max_readdir;
 666
 667         return fsc;
 668
 669 fail_trunc_wq:
 670         destroy_workqueue(fsc->trunc_wq);
 671 fail_pg_inv_wq:
 672         destroy_workqueue(fsc->pg_inv_wq);
 673 fail_wb_wq:
 674         destroy_workqueue(fsc->wb_wq);
 675 fail_client:
 676         ceph_destroy_client(fsc->client);
 677 fail:
 678         kfree(fsc);
 679         return ERR_PTR(err);
 680 }
 681
 682 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 683 {
 684         flush_workqueue(fsc->wb_wq);
 685         flush_workqueue(fsc->pg_inv_wq);
 686         flush_workqueue(fsc->trunc_wq);
 687 }
 688
 689 static void destroy_fs_client(struct ceph_fs_client *fsc)
 690 {
 691         dout("destroy_fs_client %p\n", fsc);
 692
 693         destroy_workqueue(fsc->wb_wq);
 694         destroy_workqueue(fsc->pg_inv_wq);
 695         destroy_workqueue(fsc->trunc_wq);
 696
 697         mempool_destroy(fsc->wb_pagevec_pool);
 698
 699         destroy_mount_options(fsc->mount_options);
 700
 701         ceph_destroy_client(fsc->client);
 702
 703         kfree(fsc);
 704         dout("destroy_fs_client %p done\n", fsc);
 705 }
 706
 707 /*
 708  * caches
 709  */
 710 struct kmem_cache *ceph_inode_cachep;
 711 struct kmem_cache *ceph_cap_cachep;
 712 struct kmem_cache *ceph_cap_flush_cachep;
 713 struct kmem_cache *ceph_dentry_cachep;
 714 struct kmem_cache *ceph_file_cachep;
 715 struct kmem_cache *ceph_dir_file_cachep;
 716
 717 static void ceph_inode_init_once(void *foo)
 718 {
 719         struct ceph_inode_info *ci = foo;
 720         inode_init_once(&ci->vfs_inode);
 721 }
 722
 723 static int __init init_caches(void)
 724 {
 725         int error = -ENOMEM;
 726
 727         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 728                                       sizeof(struct ceph_inode_info),
 729                                       __alignof__(struct ceph_inode_info),
 730                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 731                                       SLAB_ACCOUNT, ceph_inode_init_once);
 732         if (!ceph_inode_cachep)
 733                 return -ENOMEM;
 734
 735         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 736         if (!ceph_cap_cachep)
 737                 goto bad_cap;
 738         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 739                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 740         if (!ceph_cap_flush_cachep)
 741                 goto bad_cap_flush;
 742
 743         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 744                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 745         if (!ceph_dentry_cachep)
 746                 goto bad_dentry;
 747
 748         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 749         if (!ceph_file_cachep)
 750                 goto bad_file;
 751
 752         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 753         if (!ceph_dir_file_cachep)
 754                 goto bad_dir_file;
 755
 756         error = ceph_fscache_register();
 757         if (error)
 758                 goto bad_fscache;
 759
 760         return 0;
 761
 762 bad_fscache:
 763         kmem_cache_destroy(ceph_dir_file_cachep);
 764 bad_dir_file:
 765         kmem_cache_destroy(ceph_file_cachep);
 766 bad_file:
 767         kmem_cache_destroy(ceph_dentry_cachep);
 768 bad_dentry:
 769         kmem_cache_destroy(ceph_cap_flush_cachep);
 770 bad_cap_flush:
 771         kmem_cache_destroy(ceph_cap_cachep);
 772 bad_cap:
 773         kmem_cache_destroy(ceph_inode_cachep);
 774         return error;
 775 }
 776
 777 static void destroy_caches(void)
 778 {
 779         /*
 780          * Make sure all delayed rcu free inodes are flushed before we
 781          * destroy cache.
 782          */
 783         rcu_barrier();
 784
 785         kmem_cache_destroy(ceph_inode_cachep);
 786         kmem_cache_destroy(ceph_cap_cachep);
 787         kmem_cache_destroy(ceph_cap_flush_cachep);
 788         kmem_cache_destroy(ceph_dentry_cachep);
 789         kmem_cache_destroy(ceph_file_cachep);
 790         kmem_cache_destroy(ceph_dir_file_cachep);
 791
 792         ceph_fscache_unregister();
 793 }
 794
 795
 796 /*
 797  * ceph_umount_begin - initiate forced umount.  Tear down down the
 798  * mount, skipping steps that may hang while waiting for server(s).
 799  */
 800 static void ceph_umount_begin(struct super_block *sb)
 801 {
 802         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 803
 804         dout("ceph_umount_begin - starting forced umount\n");
 805         if (!fsc)
 806                 return;
 807         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 808         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 809         ceph_mdsc_force_umount(fsc->mdsc);
 810         return;
 811 }
 812
 813 static const struct super_operations ceph_super_ops = {
 814         .alloc_inode    = ceph_alloc_inode,
 815         .destroy_inode  = ceph_destroy_inode,
 816         .write_inode    = ceph_write_inode,
 817         .drop_inode     = ceph_drop_inode,
 818         .sync_fs        = ceph_sync_fs,
 819         .put_super      = ceph_put_super,
 820         .show_options   = ceph_show_options,
 821         .statfs         = ceph_statfs,
 822         .umount_begin   = ceph_umount_begin,
 823 };
 824
 825 /*
 826  * Bootstrap mount by opening the root directory.  Note the mount
 827  * @started time from caller, and time out if this takes too long.
 828  */
 829 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 830                                        const char *path,
 831                                        unsigned long started)
 832 {
 833         struct ceph_mds_client *mdsc = fsc->mdsc;
 834         struct ceph_mds_request *req = NULL;
 835         int err;
 836         struct dentry *root;
 837
 838         /* open dir */
 839         dout("open_root_inode opening '%s'\n", path);
 840         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 841         if (IS_ERR(req))
 842                 return ERR_CAST(req);
 843         req->r_path1 = kstrdup(path, GFP_NOFS);
 844         if (!req->r_path1) {
 845                 root = ERR_PTR(-ENOMEM);
 846                 goto out;
 847         }
 848
 849         req->r_ino1.ino = CEPH_INO_ROOT;
 850         req->r_ino1.snap = CEPH_NOSNAP;
 851         req->r_started = started;
 852         req->r_timeout = fsc->client->options->mount_timeout;
 853         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 854         req->r_num_caps = 2;
 855         err = ceph_mdsc_do_request(mdsc, NULL, req);
 856         if (err == 0) {
 857                 struct inode *inode = req->r_target_inode;
 858                 req->r_target_inode = NULL;
 859                 dout("open_root_inode success\n");
 860                 root = d_make_root(inode);
 861                 if (!root) {
 862                         root = ERR_PTR(-ENOMEM);
 863                         goto out;
 864                 }
 865                 dout("open_root_inode success, root dentry is %p\n", root);
 866         } else {
 867                 root = ERR_PTR(err);
 868         }
 869 out:
 870         ceph_mdsc_put_request(req);
 871         return root;
 872 }
 873
 874
 875
 876
 877 /*
 878  * mount: join the ceph cluster, and open root directory.
 879  */
 880 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 881 {
 882         int err;
 883         unsigned long started = jiffies;  /* note the start time */
 884         struct dentry *root;
 885
 886         dout("mount start %p\n", fsc);
 887         mutex_lock(&fsc->client->mount_mutex);
 888
 889         if (!fsc->sb->s_root) {
 890                 const char *path;
 891                 err = __ceph_open_session(fsc->client, started);
 892                 if (err < 0)
 893                         goto out;
 894
 895                 /* setup fscache */
 896                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 897                         err = ceph_fscache_register_fs(fsc);
 898                         if (err < 0)
 899                                 goto out;
 900                 }
 901
 902                 if (!fsc->mount_options->server_path) {
 903                         path = "";
 904                         dout("mount opening path \\t\n");
 905                 } else {
 906                         path = fsc->mount_options->server_path + 1;
 907                         dout("mount opening path %s\n", path);
 908                 }
 909
 910                 err = ceph_fs_debugfs_init(fsc);
 911                 if (err < 0)
 912                         goto out;
 913
 914                 root = open_root_dentry(fsc, path, started);
 915                 if (IS_ERR(root)) {
 916                         err = PTR_ERR(root);
 917                         goto out;
 918                 }
 919                 fsc->sb->s_root = dget(root);
 920         } else {
 921                 root = dget(fsc->sb->s_root);
 922         }
 923
 924         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 925         dout("mount success\n");
 926         mutex_unlock(&fsc->client->mount_mutex);
 927         return root;
 928
 929 out:
 930         mutex_unlock(&fsc->client->mount_mutex);
 931         return ERR_PTR(err);
 932 }
 933
 934 static int ceph_set_super(struct super_block *s, void *data)
 935 {
 936         struct ceph_fs_client *fsc = data;
 937         int ret;
 938
 939         dout("set_super %p data %p\n", s, data);
 940
 941         s->s_flags = fsc->mount_options->sb_flags;
 942         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 943
 944         s->s_xattr = ceph_xattr_handlers;
 945         s->s_fs_info = fsc;
 946         fsc->sb = s;
 947
 948         s->s_op = &ceph_super_ops;
 949         s->s_d_op = &ceph_dentry_ops;
 950         s->s_export_op = &ceph_export_ops;
 951
 952         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 953
 954         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 955         if (ret != 0)
 956                 goto fail;
 957
 958         return ret;
 959
 960 fail:
 961         s->s_fs_info = NULL;
 962         fsc->sb = NULL;
 963         return ret;
 964 }
 965
 966 /*
 967  * share superblock if same fs AND options
 968  */
 969 static int ceph_compare_super(struct super_block *sb, void *data)
 970 {
 971         struct ceph_fs_client *new = data;
 972         struct ceph_mount_options *fsopt = new->mount_options;
 973         struct ceph_options *opt = new->client->options;
 974         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 975
 976         dout("ceph_compare_super %p\n", sb);
 977
 978         if (compare_mount_options(fsopt, opt, other)) {
 979                 dout("monitor(s)/mount options don't match\n");
 980                 return 0;
 981         }
 982         if ((opt->flags & CEPH_OPT_FSID) &&
 983             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 984                 dout("fsid doesn't match\n");
 985                 return 0;
 986         }
 987         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 988                 dout("flags differ\n");
 989                 return 0;
 990         }
 991         return 1;
 992 }
 993
 994 /*
 995  * construct our own bdi so we can control readahead, etc.
 996  */
 997 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 998
 999 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1000 {
1001         int err;
1002
1003         err = super_setup_bdi_name(sb, "ceph-%ld",
1004                                    atomic_long_inc_return(&bdi_seq));
1005         if (err)
1006                 return err;
1007
1008         /* set ra_pages based on rasize mount option? */
1009         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1010
1011         /* set io_pages based on max osd read size */
1012         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1013
1014         return 0;
1015 }
1016
1017 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1018                        int flags, const char *dev_name, void *data)
1019 {
1020         struct super_block *sb;
1021         struct ceph_fs_client *fsc;
1022         struct dentry *res;
1023         int err;
1024         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1025         struct ceph_mount_options *fsopt = NULL;
1026         struct ceph_options *opt = NULL;
1027
1028         dout("ceph_mount\n");
1029
1030 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1031         flags |= SB_POSIXACL;
1032 #endif
1033         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1034         if (err < 0) {
1035                 res = ERR_PTR(err);
1036                 goto out_final;
1037         }
1038
1039         /* create client (which we may/may not use) */
1040         fsc = create_fs_client(fsopt, opt);
1041         if (IS_ERR(fsc)) {
1042                 res = ERR_CAST(fsc);
1043                 destroy_mount_options(fsopt);
1044                 ceph_destroy_options(opt);
1045                 goto out_final;
1046         }
1047
1048         err = ceph_mdsc_init(fsc);
1049         if (err < 0) {
1050                 res = ERR_PTR(err);
1051                 goto out;
1052         }
1053
1054         if (ceph_test_opt(fsc->client, NOSHARE))
1055                 compare_super = NULL;
1056         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1057         if (IS_ERR(sb)) {
1058                 res = ERR_CAST(sb);
1059                 goto out;
1060         }
1061
1062         if (ceph_sb_to_client(sb) != fsc) {
1063                 ceph_mdsc_destroy(fsc);
1064                 destroy_fs_client(fsc);
1065                 fsc = ceph_sb_to_client(sb);
1066                 dout("get_sb got existing client %p\n", fsc);
1067         } else {
1068                 dout("get_sb using new client %p\n", fsc);
1069                 err = ceph_setup_bdi(sb, fsc);
1070                 if (err < 0) {
1071                         res = ERR_PTR(err);
1072                         goto out_splat;
1073                 }
1074         }
1075
1076         res = ceph_real_mount(fsc);
1077         if (IS_ERR(res))
1078                 goto out_splat;
1079         dout("root %p inode %p ino %llx.%llx\n", res,
1080              d_inode(res), ceph_vinop(d_inode(res)));
1081         return res;
1082
1083 out_splat:
1084         ceph_mdsc_close_sessions(fsc->mdsc);
1085         deactivate_locked_super(sb);
1086         goto out_final;
1087
1088 out:
1089         ceph_mdsc_destroy(fsc);
1090         destroy_fs_client(fsc);
1091 out_final:
1092         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1093         return res;
1094 }
1095
1096 static void ceph_kill_sb(struct super_block *s)
1097 {
1098         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1099         dev_t dev = s->s_dev;
1100
1101         dout("kill_sb %p\n", s);
1102
1103         ceph_mdsc_pre_umount(fsc->mdsc);
1104         flush_fs_workqueues(fsc);
1105
1106         generic_shutdown_super(s);
1107
1108         fsc->client->extra_mon_dispatch = NULL;
1109         ceph_fs_debugfs_cleanup(fsc);
1110
1111         ceph_fscache_unregister_fs(fsc);
1112
1113         ceph_mdsc_destroy(fsc);
1114
1115         destroy_fs_client(fsc);
1116         free_anon_bdev(dev);
1117 }
1118
1119 static struct file_system_type ceph_fs_type = {
1120         .owner          = THIS_MODULE,
1121         .name           = "ceph",
1122         .mount          = ceph_mount,
1123         .kill_sb        = ceph_kill_sb,
1124         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1125 };
1126 MODULE_ALIAS_FS("ceph");
1127
1128 static int __init init_ceph(void)
1129 {
1130         int ret = init_caches();
1131         if (ret)
1132                 goto out;
1133
1134         ceph_flock_init();
1135         ceph_xattr_init();
1136         ret = register_filesystem(&ceph_fs_type);
1137         if (ret)
1138                 goto out_xattr;
1139
1140         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1141
1142         return 0;
1143
1144 out_xattr:
1145         ceph_xattr_exit();
1146         destroy_caches();
1147 out:
1148         return ret;
1149 }
1150
1151 static void __exit exit_ceph(void)
1152 {
1153         dout("exit_ceph\n");
1154         unregister_filesystem(&ceph_fs_type);
1155         ceph_xattr_exit();
1156         destroy_caches();
1157 }
1158
1159 module_init(init_ceph);
1160 module_exit(exit_ceph);
1161
1162 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1163 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1164 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1165 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1166 MODULE_LICENSE("GPL");