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_monmap *monmap = fsc->client->monc.monmap;
  49         struct ceph_statfs st;
  50         u64 fsid;
  51         int err;
  52
  53         dout("statfs\n");
  54         err = ceph_monc_do_statfs(&fsc->client->monc, &st);
  55         if (err < 0)
  56                 return err;
  57
  58         /* fill in kstatfs */
  59         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  60
  61         /*
  62          * express utilization in terms of large blocks to avoid
  63          * overflow on 32-bit machines.
  64          *
  65          * NOTE: for the time being, we make bsize == frsize to humor
  66          * not-yet-ancient versions of glibc that are broken.
  67          * Someday, we will probably want to report a real block
  68          * size...  whatever that may mean for a network file system!
  69          */
  70         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  71         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  72         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  73         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  74         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  75
  76         buf->f_files = le64_to_cpu(st.num_objects);
  77         buf->f_ffree = -1;
  78         buf->f_namelen = NAME_MAX;
  79
  80         /* leave fsid little-endian, regardless of host endianness */
  81         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  82         buf->f_fsid.val[0] = fsid & 0xffffffff;
  83         buf->f_fsid.val[1] = fsid >> 32;
  84
  85         return 0;
  86 }
  87
  88
  89 static int ceph_sync_fs(struct super_block *sb, int wait)
  90 {
  91         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
  92
  93         if (!wait) {
  94                 dout("sync_fs (non-blocking)\n");
  95                 ceph_flush_dirty_caps(fsc->mdsc);
  96                 dout("sync_fs (non-blocking) done\n");
  97                 return 0;
  98         }
  99
 100         dout("sync_fs (blocking)\n");
 101         ceph_osdc_sync(&fsc->client->osdc);
 102         ceph_mdsc_sync(fsc->mdsc);
 103         dout("sync_fs (blocking) done\n");
 104         return 0;
 105 }
 106
 107 /*
 108  * mount options
 109  */
 110 enum {
 111         Opt_wsize,
 112         Opt_rsize,
 113         Opt_rasize,
 114         Opt_caps_wanted_delay_min,
 115         Opt_caps_wanted_delay_max,
 116         Opt_cap_release_safety,
 117         Opt_readdir_max_entries,
 118         Opt_readdir_max_bytes,
 119         Opt_congestion_kb,
 120         Opt_last_int,
 121         /* int args above */
 122         Opt_snapdirname,
 123         Opt_mds_namespace,
 124         Opt_last_string,
 125         /* string args above */
 126         Opt_dirstat,
 127         Opt_nodirstat,
 128         Opt_rbytes,
 129         Opt_norbytes,
 130         Opt_asyncreaddir,
 131         Opt_noasyncreaddir,
 132         Opt_dcache,
 133         Opt_nodcache,
 134         Opt_ino32,
 135         Opt_noino32,
 136         Opt_fscache,
 137         Opt_nofscache,
 138         Opt_poolperm,
 139         Opt_nopoolperm,
 140         Opt_require_active_mds,
 141         Opt_norequire_active_mds,
 142 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 143         Opt_acl,
 144 #endif
 145         Opt_noacl,
 146 };
 147
 148 static match_table_t fsopt_tokens = {
 149         {Opt_wsize, "wsize=%d"},
 150         {Opt_rsize, "rsize=%d"},
 151         {Opt_rasize, "rasize=%d"},
 152         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 153         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 154         {Opt_cap_release_safety, "cap_release_safety=%d"},
 155         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 156         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 157         {Opt_congestion_kb, "write_congestion_kb=%d"},
 158         /* int args above */
 159         {Opt_snapdirname, "snapdirname=%s"},
 160         {Opt_mds_namespace, "mds_namespace=%s"},
 161         /* string args above */
 162         {Opt_dirstat, "dirstat"},
 163         {Opt_nodirstat, "nodirstat"},
 164         {Opt_rbytes, "rbytes"},
 165         {Opt_norbytes, "norbytes"},
 166         {Opt_asyncreaddir, "asyncreaddir"},
 167         {Opt_noasyncreaddir, "noasyncreaddir"},
 168         {Opt_dcache, "dcache"},
 169         {Opt_nodcache, "nodcache"},
 170         {Opt_ino32, "ino32"},
 171         {Opt_noino32, "noino32"},
 172         {Opt_fscache, "fsc"},
 173         {Opt_nofscache, "nofsc"},
 174         {Opt_poolperm, "poolperm"},
 175         {Opt_nopoolperm, "nopoolperm"},
 176         {Opt_require_active_mds, "require_active_mds"},
 177         {Opt_norequire_active_mds, "norequire_active_mds"},
 178 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 179         {Opt_acl, "acl"},
 180 #endif
 181         {Opt_noacl, "noacl"},
 182         {-1, NULL}
 183 };
 184
 185 static int parse_fsopt_token(char *c, void *private)
 186 {
 187         struct ceph_mount_options *fsopt = private;
 188         substring_t argstr[MAX_OPT_ARGS];
 189         int token, intval, ret;
 190
 191         token = match_token((char *)c, fsopt_tokens, argstr);
 192         if (token < 0)
 193                 return -EINVAL;
 194
 195         if (token < Opt_last_int) {
 196                 ret = match_int(&argstr[0], &intval);
 197                 if (ret < 0) {
 198                         pr_err("bad mount option arg (not int) "
 199                                "at '%s'\n", c);
 200                         return ret;
 201                 }
 202                 dout("got int token %d val %d\n", token, intval);
 203         } else if (token > Opt_last_int && token < Opt_last_string) {
 204                 dout("got string token %d val %s\n", token,
 205                      argstr[0].from);
 206         } else {
 207                 dout("got token %d\n", token);
 208         }
 209
 210         switch (token) {
 211         case Opt_snapdirname:
 212                 kfree(fsopt->snapdir_name);
 213                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 214                                                argstr[0].to-argstr[0].from,
 215                                                GFP_KERNEL);
 216                 if (!fsopt->snapdir_name)
 217                         return -ENOMEM;
 218                 break;
 219         case Opt_mds_namespace:
 220                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 221                                                 argstr[0].to-argstr[0].from,
 222                                                 GFP_KERNEL);
 223                 if (!fsopt->mds_namespace)
 224                         return -ENOMEM;
 225                 break;
 226                 /* misc */
 227         case Opt_wsize:
 228                 fsopt->wsize = intval;
 229                 break;
 230         case Opt_rsize:
 231                 fsopt->rsize = intval;
 232                 break;
 233         case Opt_rasize:
 234                 fsopt->rasize = intval;
 235                 break;
 236         case Opt_caps_wanted_delay_min:
 237                 fsopt->caps_wanted_delay_min = intval;
 238                 break;
 239         case Opt_caps_wanted_delay_max:
 240                 fsopt->caps_wanted_delay_max = intval;
 241                 break;
 242         case Opt_readdir_max_entries:
 243                 fsopt->max_readdir = intval;
 244                 break;
 245         case Opt_readdir_max_bytes:
 246                 fsopt->max_readdir_bytes = intval;
 247                 break;
 248         case Opt_congestion_kb:
 249                 fsopt->congestion_kb = intval;
 250                 break;
 251         case Opt_dirstat:
 252                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 253                 break;
 254         case Opt_nodirstat:
 255                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 256                 break;
 257         case Opt_rbytes:
 258                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 259                 break;
 260         case Opt_norbytes:
 261                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 262                 break;
 263         case Opt_asyncreaddir:
 264                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 265                 break;
 266         case Opt_noasyncreaddir:
 267                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 268                 break;
 269         case Opt_dcache:
 270                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 271                 break;
 272         case Opt_nodcache:
 273                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 274                 break;
 275         case Opt_ino32:
 276                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 277                 break;
 278         case Opt_noino32:
 279                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 280                 break;
 281         case Opt_fscache:
 282                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 283                 break;
 284         case Opt_nofscache:
 285                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 286                 break;
 287         case Opt_poolperm:
 288                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 289                 printk ("pool perm");
 290                 break;
 291         case Opt_nopoolperm:
 292                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 293                 break;
 294         case Opt_require_active_mds:
 295                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 296                 break;
 297         case Opt_norequire_active_mds:
 298                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 299                 break;
 300 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 301         case Opt_acl:
 302                 fsopt->sb_flags |= MS_POSIXACL;
 303                 break;
 304 #endif
 305         case Opt_noacl:
 306                 fsopt->sb_flags &= ~MS_POSIXACL;
 307                 break;
 308         default:
 309                 BUG_ON(token);
 310         }
 311         return 0;
 312 }
 313
 314 static void destroy_mount_options(struct ceph_mount_options *args)
 315 {
 316         dout("destroy_mount_options %p\n", args);
 317         kfree(args->snapdir_name);
 318         kfree(args->mds_namespace);
 319         kfree(args->server_path);
 320         kfree(args);
 321 }
 322
 323 static int strcmp_null(const char *s1, const char *s2)
 324 {
 325         if (!s1 && !s2)
 326                 return 0;
 327         if (s1 && !s2)
 328                 return -1;
 329         if (!s1 && s2)
 330                 return 1;
 331         return strcmp(s1, s2);
 332 }
 333
 334 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 335                                  struct ceph_options *new_opt,
 336                                  struct ceph_fs_client *fsc)
 337 {
 338         struct ceph_mount_options *fsopt1 = new_fsopt;
 339         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 340         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 341         int ret;
 342
 343         ret = memcmp(fsopt1, fsopt2, ofs);
 344         if (ret)
 345                 return ret;
 346
 347         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 348         if (ret)
 349                 return ret;
 350         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 351         if (ret)
 352                 return ret;
 353
 354         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 355         if (ret)
 356                 return ret;
 357
 358         return ceph_compare_options(new_opt, fsc->client);
 359 }
 360
 361 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 362                                struct ceph_options **popt,
 363                                int flags, char *options,
 364                                const char *dev_name)
 365 {
 366         struct ceph_mount_options *fsopt;
 367         const char *dev_name_end;
 368         int err;
 369
 370         if (!dev_name || !*dev_name)
 371                 return -EINVAL;
 372
 373         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 374         if (!fsopt)
 375                 return -ENOMEM;
 376
 377         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 378
 379         fsopt->sb_flags = flags;
 380         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 381
 382         fsopt->rsize = CEPH_RSIZE_DEFAULT;
 383         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 384         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 385         if (!fsopt->snapdir_name) {
 386                 err = -ENOMEM;
 387                 goto out;
 388         }
 389
 390         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 391         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 392         fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
 393         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 394         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 395         fsopt->congestion_kb = default_congestion_kb();
 396
 397         /*
 398          * Distinguish the server list from the path in "dev_name".
 399          * Internally we do not include the leading '/' in the path.
 400          *
 401          * "dev_name" will look like:
 402          *     <server_spec>[,<server_spec>...]:[<path>]
 403          * where
 404          *     <server_spec> is <ip>[:<port>]
 405          *     <path> is optional, but if present must begin with '/'
 406          */
 407         dev_name_end = strchr(dev_name, '/');
 408         if (dev_name_end) {
 409                 if (strlen(dev_name_end) > 1) {
 410                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 411                         if (!fsopt->server_path) {
 412                                 err = -ENOMEM;
 413                                 goto out;
 414                         }
 415                 }
 416         } else {
 417                 dev_name_end = dev_name + strlen(dev_name);
 418         }
 419         err = -EINVAL;
 420         dev_name_end--;         /* back up to ':' separator */
 421         if (dev_name_end < dev_name || *dev_name_end != ':') {
 422                 pr_err("device name is missing path (no : separator in %s)\n",
 423                                 dev_name);
 424                 goto out;
 425         }
 426         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 427         if (fsopt->server_path)
 428                 dout("server path '%s'\n", fsopt->server_path);
 429
 430         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 431                                  parse_fsopt_token, (void *)fsopt);
 432         if (IS_ERR(*popt)) {
 433                 err = PTR_ERR(*popt);
 434                 goto out;
 435         }
 436
 437         /* success */
 438         *pfsopt = fsopt;
 439         return 0;
 440
 441 out:
 442         destroy_mount_options(fsopt);
 443         return err;
 444 }
 445
 446 /**
 447  * ceph_show_options - Show mount options in /proc/mounts
 448  * @m: seq_file to write to
 449  * @root: root of that (sub)tree
 450  */
 451 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 452 {
 453         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 454         struct ceph_mount_options *fsopt = fsc->mount_options;
 455         size_t pos;
 456         int ret;
 457
 458         /* a comma between MNT/MS and client options */
 459         seq_putc(m, ',');
 460         pos = m->count;
 461
 462         ret = ceph_print_client_options(m, fsc->client);
 463         if (ret)
 464                 return ret;
 465
 466         /* retract our comma if no client options */
 467         if (m->count == pos)
 468                 m->count--;
 469
 470         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 471                 seq_puts(m, ",dirstat");
 472         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 473                 seq_puts(m, ",rbytes");
 474         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 475                 seq_puts(m, ",noasyncreaddir");
 476         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 477                 seq_puts(m, ",nodcache");
 478         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
 479                 seq_puts(m, ",fsc");
 480         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 481                 seq_puts(m, ",nopoolperm");
 482
 483 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 484         if (fsopt->sb_flags & MS_POSIXACL)
 485                 seq_puts(m, ",acl");
 486         else
 487                 seq_puts(m, ",noacl");
 488 #endif
 489
 490         if (fsopt->mds_namespace)
 491                 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
 492         if (fsopt->wsize)
 493                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 494         if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
 495                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 496         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 497                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 498         if (fsopt->congestion_kb != default_congestion_kb())
 499                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 500         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 501                 seq_printf(m, ",caps_wanted_delay_min=%d",
 502                          fsopt->caps_wanted_delay_min);
 503         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 504                 seq_printf(m, ",caps_wanted_delay_max=%d",
 505                            fsopt->caps_wanted_delay_max);
 506         if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 507                 seq_printf(m, ",cap_release_safety=%d",
 508                            fsopt->cap_release_safety);
 509         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 510                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 511         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 512                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 513         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 514                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 515
 516         return 0;
 517 }
 518
 519 /*
 520  * handle any mon messages the standard library doesn't understand.
 521  * return error if we don't either.
 522  */
 523 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 524 {
 525         struct ceph_fs_client *fsc = client->private;
 526         int type = le16_to_cpu(msg->hdr.type);
 527
 528         switch (type) {
 529         case CEPH_MSG_MDS_MAP:
 530                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 531                 return 0;
 532         case CEPH_MSG_FS_MAP_USER:
 533                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 534                 return 0;
 535         default:
 536                 return -1;
 537         }
 538 }
 539
 540 /*
 541  * create a new fs client
 542  */
 543 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 544                                         struct ceph_options *opt)
 545 {
 546         struct ceph_fs_client *fsc;
 547         const u64 supported_features =
 548                 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
 549                 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
 550         const u64 required_features = 0;
 551         int page_count;
 552         size_t size;
 553         int err = -ENOMEM;
 554
 555         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 556         if (!fsc)
 557                 return ERR_PTR(-ENOMEM);
 558
 559         fsc->client = ceph_create_client(opt, fsc, supported_features,
 560                                          required_features);
 561         if (IS_ERR(fsc->client)) {
 562                 err = PTR_ERR(fsc->client);
 563                 goto fail;
 564         }
 565         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 566
 567         if (fsopt->mds_namespace == NULL) {
 568                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 569                                    0, true);
 570         } else {
 571                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 572                                    0, false);
 573         }
 574
 575         fsc->mount_options = fsopt;
 576
 577         fsc->sb = NULL;
 578         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 579
 580         atomic_long_set(&fsc->writeback_count, 0);
 581
 582         err = bdi_init(&fsc->backing_dev_info);
 583         if (err < 0)
 584                 goto fail_client;
 585
 586         err = -ENOMEM;
 587         /*
 588          * The number of concurrent works can be high but they don't need
 589          * to be processed in parallel, limit concurrency.
 590          */
 591         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 592         if (fsc->wb_wq == NULL)
 593                 goto fail_bdi;
 594         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 595         if (fsc->pg_inv_wq == NULL)
 596                 goto fail_wb_wq;
 597         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 598         if (fsc->trunc_wq == NULL)
 599                 goto fail_pg_inv_wq;
 600
 601         /* set up mempools */
 602         err = -ENOMEM;
 603         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 604         size = sizeof (struct page *) * (page_count ? page_count : 1);
 605         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 606         if (!fsc->wb_pagevec_pool)
 607                 goto fail_trunc_wq;
 608
 609         /* setup fscache */
 610         if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
 611             (ceph_fscache_register_fs(fsc) != 0))
 612                 goto fail_fscache;
 613
 614         /* caps */
 615         fsc->min_caps = fsopt->max_readdir;
 616
 617         return fsc;
 618
 619 fail_fscache:
 620         ceph_fscache_unregister_fs(fsc);
 621 fail_trunc_wq:
 622         destroy_workqueue(fsc->trunc_wq);
 623 fail_pg_inv_wq:
 624         destroy_workqueue(fsc->pg_inv_wq);
 625 fail_wb_wq:
 626         destroy_workqueue(fsc->wb_wq);
 627 fail_bdi:
 628         bdi_destroy(&fsc->backing_dev_info);
 629 fail_client:
 630         ceph_destroy_client(fsc->client);
 631 fail:
 632         kfree(fsc);
 633         return ERR_PTR(err);
 634 }
 635
 636 static void destroy_fs_client(struct ceph_fs_client *fsc)
 637 {
 638         dout("destroy_fs_client %p\n", fsc);
 639
 640         ceph_fscache_unregister_fs(fsc);
 641
 642         destroy_workqueue(fsc->wb_wq);
 643         destroy_workqueue(fsc->pg_inv_wq);
 644         destroy_workqueue(fsc->trunc_wq);
 645
 646         bdi_destroy(&fsc->backing_dev_info);
 647
 648         mempool_destroy(fsc->wb_pagevec_pool);
 649
 650         destroy_mount_options(fsc->mount_options);
 651
 652         ceph_fs_debugfs_cleanup(fsc);
 653
 654         ceph_destroy_client(fsc->client);
 655
 656         kfree(fsc);
 657         dout("destroy_fs_client %p done\n", fsc);
 658 }
 659
 660 /*
 661  * caches
 662  */
 663 struct kmem_cache *ceph_inode_cachep;
 664 struct kmem_cache *ceph_cap_cachep;
 665 struct kmem_cache *ceph_cap_flush_cachep;
 666 struct kmem_cache *ceph_dentry_cachep;
 667 struct kmem_cache *ceph_file_cachep;
 668
 669 static void ceph_inode_init_once(void *foo)
 670 {
 671         struct ceph_inode_info *ci = foo;
 672         inode_init_once(&ci->vfs_inode);
 673 }
 674
 675 static int __init init_caches(void)
 676 {
 677         int error = -ENOMEM;
 678
 679         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 680                                       sizeof(struct ceph_inode_info),
 681                                       __alignof__(struct ceph_inode_info),
 682                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 683                                       SLAB_ACCOUNT, ceph_inode_init_once);
 684         if (ceph_inode_cachep == NULL)
 685                 return -ENOMEM;
 686
 687         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 688                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 689         if (ceph_cap_cachep == NULL)
 690                 goto bad_cap;
 691         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 692                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 693         if (ceph_cap_flush_cachep == NULL)
 694                 goto bad_cap_flush;
 695
 696         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 697                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 698         if (ceph_dentry_cachep == NULL)
 699                 goto bad_dentry;
 700
 701         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 702
 703         if (ceph_file_cachep == NULL)
 704                 goto bad_file;
 705
 706         if ((error = ceph_fscache_register()))
 707                 goto bad_file;
 708
 709         return 0;
 710 bad_file:
 711         kmem_cache_destroy(ceph_dentry_cachep);
 712 bad_dentry:
 713         kmem_cache_destroy(ceph_cap_flush_cachep);
 714 bad_cap_flush:
 715         kmem_cache_destroy(ceph_cap_cachep);
 716 bad_cap:
 717         kmem_cache_destroy(ceph_inode_cachep);
 718         return error;
 719 }
 720
 721 static void destroy_caches(void)
 722 {
 723         /*
 724          * Make sure all delayed rcu free inodes are flushed before we
 725          * destroy cache.
 726          */
 727         rcu_barrier();
 728
 729         kmem_cache_destroy(ceph_inode_cachep);
 730         kmem_cache_destroy(ceph_cap_cachep);
 731         kmem_cache_destroy(ceph_cap_flush_cachep);
 732         kmem_cache_destroy(ceph_dentry_cachep);
 733         kmem_cache_destroy(ceph_file_cachep);
 734
 735         ceph_fscache_unregister();
 736 }
 737
 738
 739 /*
 740  * ceph_umount_begin - initiate forced umount.  Tear down down the
 741  * mount, skipping steps that may hang while waiting for server(s).
 742  */
 743 static void ceph_umount_begin(struct super_block *sb)
 744 {
 745         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 746
 747         dout("ceph_umount_begin - starting forced umount\n");
 748         if (!fsc)
 749                 return;
 750         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 751         ceph_mdsc_force_umount(fsc->mdsc);
 752         return;
 753 }
 754
 755 static const struct super_operations ceph_super_ops = {
 756         .alloc_inode    = ceph_alloc_inode,
 757         .destroy_inode  = ceph_destroy_inode,
 758         .write_inode    = ceph_write_inode,
 759         .drop_inode     = ceph_drop_inode,
 760         .evict_inode    = ceph_evict_inode,
 761         .sync_fs        = ceph_sync_fs,
 762         .put_super      = ceph_put_super,
 763         .show_options   = ceph_show_options,
 764         .statfs         = ceph_statfs,
 765         .umount_begin   = ceph_umount_begin,
 766 };
 767
 768 /*
 769  * Bootstrap mount by opening the root directory.  Note the mount
 770  * @started time from caller, and time out if this takes too long.
 771  */
 772 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 773                                        const char *path,
 774                                        unsigned long started)
 775 {
 776         struct ceph_mds_client *mdsc = fsc->mdsc;
 777         struct ceph_mds_request *req = NULL;
 778         int err;
 779         struct dentry *root;
 780
 781         /* open dir */
 782         dout("open_root_inode opening '%s'\n", path);
 783         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 784         if (IS_ERR(req))
 785                 return ERR_CAST(req);
 786         req->r_path1 = kstrdup(path, GFP_NOFS);
 787         if (!req->r_path1) {
 788                 root = ERR_PTR(-ENOMEM);
 789                 goto out;
 790         }
 791
 792         req->r_ino1.ino = CEPH_INO_ROOT;
 793         req->r_ino1.snap = CEPH_NOSNAP;
 794         req->r_started = started;
 795         req->r_timeout = fsc->client->options->mount_timeout;
 796         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 797         req->r_num_caps = 2;
 798         err = ceph_mdsc_do_request(mdsc, NULL, req);
 799         if (err == 0) {
 800                 struct inode *inode = req->r_target_inode;
 801                 req->r_target_inode = NULL;
 802                 dout("open_root_inode success\n");
 803                 root = d_make_root(inode);
 804                 if (!root) {
 805                         root = ERR_PTR(-ENOMEM);
 806                         goto out;
 807                 }
 808                 dout("open_root_inode success, root dentry is %p\n", root);
 809         } else {
 810                 root = ERR_PTR(err);
 811         }
 812 out:
 813         ceph_mdsc_put_request(req);
 814         return root;
 815 }
 816
 817
 818
 819
 820 /*
 821  * mount: join the ceph cluster, and open root directory.
 822  */
 823 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 824 {
 825         int err;
 826         unsigned long started = jiffies;  /* note the start time */
 827         struct dentry *root;
 828         int first = 0;   /* first vfsmount for this super_block */
 829
 830         dout("mount start %p\n", fsc);
 831         mutex_lock(&fsc->client->mount_mutex);
 832
 833         if (!fsc->sb->s_root) {
 834                 const char *path;
 835                 err = __ceph_open_session(fsc->client, started);
 836                 if (err < 0)
 837                         goto out;
 838
 839                 if (!fsc->mount_options->server_path) {
 840                         path = "";
 841                         dout("mount opening path \\t\n");
 842                 } else {
 843                         path = fsc->mount_options->server_path + 1;
 844                         dout("mount opening path %s\n", path);
 845                 }
 846                 root = open_root_dentry(fsc, path, started);
 847                 if (IS_ERR(root)) {
 848                         err = PTR_ERR(root);
 849                         goto out;
 850                 }
 851                 fsc->sb->s_root = dget(root);
 852                 first = 1;
 853
 854                 err = ceph_fs_debugfs_init(fsc);
 855                 if (err < 0)
 856                         goto fail;
 857         } else {
 858                 root = dget(fsc->sb->s_root);
 859         }
 860
 861         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 862         dout("mount success\n");
 863         mutex_unlock(&fsc->client->mount_mutex);
 864         return root;
 865
 866 fail:
 867         if (first) {
 868                 dput(fsc->sb->s_root);
 869                 fsc->sb->s_root = NULL;
 870         }
 871 out:
 872         mutex_unlock(&fsc->client->mount_mutex);
 873         return ERR_PTR(err);
 874 }
 875
 876 static int ceph_set_super(struct super_block *s, void *data)
 877 {
 878         struct ceph_fs_client *fsc = data;
 879         int ret;
 880
 881         dout("set_super %p data %p\n", s, data);
 882
 883         s->s_flags = fsc->mount_options->sb_flags;
 884         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 885
 886         s->s_xattr = ceph_xattr_handlers;
 887         s->s_fs_info = fsc;
 888         fsc->sb = s;
 889
 890         s->s_op = &ceph_super_ops;
 891         s->s_d_op = &ceph_dentry_ops;
 892         s->s_export_op = &ceph_export_ops;
 893
 894         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 895
 896         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 897         if (ret != 0)
 898                 goto fail;
 899
 900         return ret;
 901
 902 fail:
 903         s->s_fs_info = NULL;
 904         fsc->sb = NULL;
 905         return ret;
 906 }
 907
 908 /*
 909  * share superblock if same fs AND options
 910  */
 911 static int ceph_compare_super(struct super_block *sb, void *data)
 912 {
 913         struct ceph_fs_client *new = data;
 914         struct ceph_mount_options *fsopt = new->mount_options;
 915         struct ceph_options *opt = new->client->options;
 916         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 917
 918         dout("ceph_compare_super %p\n", sb);
 919
 920         if (compare_mount_options(fsopt, opt, other)) {
 921                 dout("monitor(s)/mount options don't match\n");
 922                 return 0;
 923         }
 924         if ((opt->flags & CEPH_OPT_FSID) &&
 925             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 926                 dout("fsid doesn't match\n");
 927                 return 0;
 928         }
 929         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 930                 dout("flags differ\n");
 931                 return 0;
 932         }
 933         return 1;
 934 }
 935
 936 /*
 937  * construct our own bdi so we can control readahead, etc.
 938  */
 939 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 940
 941 static int ceph_register_bdi(struct super_block *sb,
 942                              struct ceph_fs_client *fsc)
 943 {
 944         int err;
 945
 946         /* set ra_pages based on rasize mount option? */
 947         if (fsc->mount_options->rasize >= PAGE_SIZE)
 948                 fsc->backing_dev_info.ra_pages =
 949                         (fsc->mount_options->rasize + PAGE_SIZE - 1)
 950                         >> PAGE_SHIFT;
 951         else
 952                 fsc->backing_dev_info.ra_pages =
 953                         VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
 954
 955         err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
 956                            atomic_long_inc_return(&bdi_seq));
 957         if (!err)
 958                 sb->s_bdi = &fsc->backing_dev_info;
 959         return err;
 960 }
 961
 962 static struct dentry *ceph_mount(struct file_system_type *fs_type,
 963                        int flags, const char *dev_name, void *data)
 964 {
 965         struct super_block *sb;
 966         struct ceph_fs_client *fsc;
 967         struct dentry *res;
 968         int err;
 969         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 970         struct ceph_mount_options *fsopt = NULL;
 971         struct ceph_options *opt = NULL;
 972
 973         dout("ceph_mount\n");
 974
 975 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 976         flags |= MS_POSIXACL;
 977 #endif
 978         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
 979         if (err < 0) {
 980                 res = ERR_PTR(err);
 981                 goto out_final;
 982         }
 983
 984         /* create client (which we may/may not use) */
 985         fsc = create_fs_client(fsopt, opt);
 986         if (IS_ERR(fsc)) {
 987                 res = ERR_CAST(fsc);
 988                 destroy_mount_options(fsopt);
 989                 ceph_destroy_options(opt);
 990                 goto out_final;
 991         }
 992
 993         err = ceph_mdsc_init(fsc);
 994         if (err < 0) {
 995                 res = ERR_PTR(err);
 996                 goto out;
 997         }
 998
 999         if (ceph_test_opt(fsc->client, NOSHARE))
1000                 compare_super = NULL;
1001         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1002         if (IS_ERR(sb)) {
1003                 res = ERR_CAST(sb);
1004                 goto out;
1005         }
1006
1007         if (ceph_sb_to_client(sb) != fsc) {
1008                 ceph_mdsc_destroy(fsc);
1009                 destroy_fs_client(fsc);
1010                 fsc = ceph_sb_to_client(sb);
1011                 dout("get_sb got existing client %p\n", fsc);
1012         } else {
1013                 dout("get_sb using new client %p\n", fsc);
1014                 err = ceph_register_bdi(sb, fsc);
1015                 if (err < 0) {
1016                         res = ERR_PTR(err);
1017                         goto out_splat;
1018                 }
1019         }
1020
1021         res = ceph_real_mount(fsc);
1022         if (IS_ERR(res))
1023                 goto out_splat;
1024         dout("root %p inode %p ino %llx.%llx\n", res,
1025              d_inode(res), ceph_vinop(d_inode(res)));
1026         return res;
1027
1028 out_splat:
1029         ceph_mdsc_close_sessions(fsc->mdsc);
1030         deactivate_locked_super(sb);
1031         goto out_final;
1032
1033 out:
1034         ceph_mdsc_destroy(fsc);
1035         destroy_fs_client(fsc);
1036 out_final:
1037         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1038         return res;
1039 }
1040
1041 static void ceph_kill_sb(struct super_block *s)
1042 {
1043         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1044         dev_t dev = s->s_dev;
1045
1046         dout("kill_sb %p\n", s);
1047
1048         ceph_mdsc_pre_umount(fsc->mdsc);
1049         generic_shutdown_super(s);
1050         ceph_mdsc_destroy(fsc);
1051
1052         destroy_fs_client(fsc);
1053         free_anon_bdev(dev);
1054 }
1055
1056 static struct file_system_type ceph_fs_type = {
1057         .owner          = THIS_MODULE,
1058         .name           = "ceph",
1059         .mount          = ceph_mount,
1060         .kill_sb        = ceph_kill_sb,
1061         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1062 };
1063 MODULE_ALIAS_FS("ceph");
1064
1065 static int __init init_ceph(void)
1066 {
1067         int ret = init_caches();
1068         if (ret)
1069                 goto out;
1070
1071         ceph_flock_init();
1072         ceph_xattr_init();
1073         ret = register_filesystem(&ceph_fs_type);
1074         if (ret)
1075                 goto out_xattr;
1076
1077         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1078
1079         return 0;
1080
1081 out_xattr:
1082         ceph_xattr_exit();
1083         destroy_caches();
1084 out:
1085         return ret;
1086 }
1087
1088 static void __exit exit_ceph(void)
1089 {
1090         dout("exit_ceph\n");
1091         unregister_filesystem(&ceph_fs_type);
1092         ceph_xattr_exit();
1093         destroy_caches();
1094 }
1095
1096 module_init(init_ceph);
1097 module_exit(exit_ceph);
1098
1099 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1100 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1101 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1102 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1103 MODULE_LICENSE("GPL");