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