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