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         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(&fsc->client->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         fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^
  98                le64_to_cpu(*((__le64 *)&monmap->fsid + 1));
  99         buf->f_fsid.val[0] = fsid & 0xffffffff;
 100         buf->f_fsid.val[1] = fsid >> 32;
 101
 102         return 0;
 103 }
 104
 105
 106 static int ceph_sync_fs(struct super_block *sb, int wait)
 107 {
 108         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 109
 110         if (!wait) {
 111                 dout("sync_fs (non-blocking)\n");
 112                 ceph_flush_dirty_caps(fsc->mdsc);
 113                 dout("sync_fs (non-blocking) done\n");
 114                 return 0;
 115         }
 116
 117         dout("sync_fs (blocking)\n");
 118         ceph_osdc_sync(&fsc->client->osdc);
 119         ceph_mdsc_sync(fsc->mdsc);
 120         dout("sync_fs (blocking) done\n");
 121         return 0;
 122 }
 123
 124 /*
 125  * mount options
 126  */
 127 enum {
 128         Opt_wsize,
 129         Opt_rsize,
 130         Opt_rasize,
 131         Opt_caps_wanted_delay_min,
 132         Opt_caps_wanted_delay_max,
 133         Opt_readdir_max_entries,
 134         Opt_readdir_max_bytes,
 135         Opt_congestion_kb,
 136         Opt_last_int,
 137         /* int args above */
 138         Opt_snapdirname,
 139         Opt_mds_namespace,
 140         Opt_fscache_uniq,
 141         Opt_last_string,
 142         /* string args above */
 143         Opt_dirstat,
 144         Opt_nodirstat,
 145         Opt_rbytes,
 146         Opt_norbytes,
 147         Opt_asyncreaddir,
 148         Opt_noasyncreaddir,
 149         Opt_dcache,
 150         Opt_nodcache,
 151         Opt_ino32,
 152         Opt_noino32,
 153         Opt_fscache,
 154         Opt_nofscache,
 155         Opt_poolperm,
 156         Opt_nopoolperm,
 157         Opt_require_active_mds,
 158         Opt_norequire_active_mds,
 159 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 160         Opt_acl,
 161 #endif
 162         Opt_noacl,
 163         Opt_quotadf,
 164         Opt_noquotadf,
 165 };
 166
 167 static match_table_t fsopt_tokens = {
 168         {Opt_wsize, "wsize=%d"},
 169         {Opt_rsize, "rsize=%d"},
 170         {Opt_rasize, "rasize=%d"},
 171         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 172         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 173         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 174         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 175         {Opt_congestion_kb, "write_congestion_kb=%d"},
 176         /* int args above */
 177         {Opt_snapdirname, "snapdirname=%s"},
 178         {Opt_mds_namespace, "mds_namespace=%s"},
 179         {Opt_fscache_uniq, "fsc=%s"},
 180         /* string args above */
 181         {Opt_dirstat, "dirstat"},
 182         {Opt_nodirstat, "nodirstat"},
 183         {Opt_rbytes, "rbytes"},
 184         {Opt_norbytes, "norbytes"},
 185         {Opt_asyncreaddir, "asyncreaddir"},
 186         {Opt_noasyncreaddir, "noasyncreaddir"},
 187         {Opt_dcache, "dcache"},
 188         {Opt_nodcache, "nodcache"},
 189         {Opt_ino32, "ino32"},
 190         {Opt_noino32, "noino32"},
 191         {Opt_fscache, "fsc"},
 192         {Opt_nofscache, "nofsc"},
 193         {Opt_poolperm, "poolperm"},
 194         {Opt_nopoolperm, "nopoolperm"},
 195         {Opt_require_active_mds, "require_active_mds"},
 196         {Opt_norequire_active_mds, "norequire_active_mds"},
 197 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 198         {Opt_acl, "acl"},
 199 #endif
 200         {Opt_noacl, "noacl"},
 201         {Opt_quotadf, "quotadf"},
 202         {Opt_noquotadf, "noquotadf"},
 203         {-1, NULL}
 204 };
 205
 206 static int parse_fsopt_token(char *c, void *private)
 207 {
 208         struct ceph_mount_options *fsopt = private;
 209         substring_t argstr[MAX_OPT_ARGS];
 210         int token, intval, ret;
 211
 212         token = match_token((char *)c, fsopt_tokens, argstr);
 213         if (token < 0)
 214                 return -EINVAL;
 215
 216         if (token < Opt_last_int) {
 217                 ret = match_int(&argstr[0], &intval);
 218                 if (ret < 0) {
 219                         pr_err("bad mount option arg (not int) "
 220                                "at '%s'\n", c);
 221                         return ret;
 222                 }
 223                 dout("got int token %d val %d\n", token, intval);
 224         } else if (token > Opt_last_int && token < Opt_last_string) {
 225                 dout("got string token %d val %s\n", token,
 226                      argstr[0].from);
 227         } else {
 228                 dout("got token %d\n", token);
 229         }
 230
 231         switch (token) {
 232         case Opt_snapdirname:
 233                 kfree(fsopt->snapdir_name);
 234                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 235                                                argstr[0].to-argstr[0].from,
 236                                                GFP_KERNEL);
 237                 if (!fsopt->snapdir_name)
 238                         return -ENOMEM;
 239                 break;
 240         case Opt_mds_namespace:
 241                 kfree(fsopt->mds_namespace);
 242                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 243                                                 argstr[0].to-argstr[0].from,
 244                                                 GFP_KERNEL);
 245                 if (!fsopt->mds_namespace)
 246                         return -ENOMEM;
 247                 break;
 248         case Opt_fscache_uniq:
 249                 kfree(fsopt->fscache_uniq);
 250                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 251                                                argstr[0].to-argstr[0].from,
 252                                                GFP_KERNEL);
 253                 if (!fsopt->fscache_uniq)
 254                         return -ENOMEM;
 255                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 256                 break;
 257                 /* misc */
 258         case Opt_wsize:
 259                 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 260                         return -EINVAL;
 261                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 262                 break;
 263         case Opt_rsize:
 264                 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 265                         return -EINVAL;
 266                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 267                 break;
 268         case Opt_rasize:
 269                 if (intval < 0)
 270                         return -EINVAL;
 271                 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
 272                 break;
 273         case Opt_caps_wanted_delay_min:
 274                 if (intval < 1)
 275                         return -EINVAL;
 276                 fsopt->caps_wanted_delay_min = intval;
 277                 break;
 278         case Opt_caps_wanted_delay_max:
 279                 if (intval < 1)
 280                         return -EINVAL;
 281                 fsopt->caps_wanted_delay_max = intval;
 282                 break;
 283         case Opt_readdir_max_entries:
 284                 if (intval < 1)
 285                         return -EINVAL;
 286                 fsopt->max_readdir = intval;
 287                 break;
 288         case Opt_readdir_max_bytes:
 289                 if (intval < PAGE_SIZE && intval != 0)
 290                         return -EINVAL;
 291                 fsopt->max_readdir_bytes = intval;
 292                 break;
 293         case Opt_congestion_kb:
 294                 if (intval < 1024) /* at least 1M */
 295                         return -EINVAL;
 296                 fsopt->congestion_kb = intval;
 297                 break;
 298         case Opt_dirstat:
 299                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 300                 break;
 301         case Opt_nodirstat:
 302                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 303                 break;
 304         case Opt_rbytes:
 305                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 306                 break;
 307         case Opt_norbytes:
 308                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 309                 break;
 310         case Opt_asyncreaddir:
 311                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 312                 break;
 313         case Opt_noasyncreaddir:
 314                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 315                 break;
 316         case Opt_dcache:
 317                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 318                 break;
 319         case Opt_nodcache:
 320                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 321                 break;
 322         case Opt_ino32:
 323                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 324                 break;
 325         case Opt_noino32:
 326                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 327                 break;
 328         case Opt_fscache:
 329                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 330                 kfree(fsopt->fscache_uniq);
 331                 fsopt->fscache_uniq = NULL;
 332                 break;
 333         case Opt_nofscache:
 334                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 335                 kfree(fsopt->fscache_uniq);
 336                 fsopt->fscache_uniq = NULL;
 337                 break;
 338         case Opt_poolperm:
 339                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 340                 break;
 341         case Opt_nopoolperm:
 342                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 343                 break;
 344         case Opt_require_active_mds:
 345                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 346                 break;
 347         case Opt_norequire_active_mds:
 348                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 349                 break;
 350         case Opt_quotadf:
 351                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 352                 break;
 353         case Opt_noquotadf:
 354                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 355                 break;
 356 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 357         case Opt_acl:
 358                 fsopt->sb_flags |= SB_POSIXACL;
 359                 break;
 360 #endif
 361         case Opt_noacl:
 362                 fsopt->sb_flags &= ~SB_POSIXACL;
 363                 break;
 364         default:
 365                 BUG_ON(token);
 366         }
 367         return 0;
 368 }
 369
 370 static void destroy_mount_options(struct ceph_mount_options *args)
 371 {
 372         dout("destroy_mount_options %p\n", args);
 373         kfree(args->snapdir_name);
 374         kfree(args->mds_namespace);
 375         kfree(args->server_path);
 376         kfree(args->fscache_uniq);
 377         kfree(args);
 378 }
 379
 380 static int strcmp_null(const char *s1, const char *s2)
 381 {
 382         if (!s1 && !s2)
 383                 return 0;
 384         if (s1 && !s2)
 385                 return -1;
 386         if (!s1 && s2)
 387                 return 1;
 388         return strcmp(s1, s2);
 389 }
 390
 391 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 392                                  struct ceph_options *new_opt,
 393                                  struct ceph_fs_client *fsc)
 394 {
 395         struct ceph_mount_options *fsopt1 = new_fsopt;
 396         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 397         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 398         int ret;
 399
 400         ret = memcmp(fsopt1, fsopt2, ofs);
 401         if (ret)
 402                 return ret;
 403
 404         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 405         if (ret)
 406                 return ret;
 407         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 408         if (ret)
 409                 return ret;
 410         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 411         if (ret)
 412                 return ret;
 413         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 414         if (ret)
 415                 return ret;
 416
 417         return ceph_compare_options(new_opt, fsc->client);
 418 }
 419
 420 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 421                                struct ceph_options **popt,
 422                                int flags, char *options,
 423                                const char *dev_name)
 424 {
 425         struct ceph_mount_options *fsopt;
 426         const char *dev_name_end;
 427         int err;
 428
 429         if (!dev_name || !*dev_name)
 430                 return -EINVAL;
 431
 432         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 433         if (!fsopt)
 434                 return -ENOMEM;
 435
 436         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 437
 438         fsopt->sb_flags = flags;
 439         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 440
 441         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 442         fsopt->rsize = CEPH_MAX_READ_SIZE;
 443         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 444         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 445         if (!fsopt->snapdir_name) {
 446                 err = -ENOMEM;
 447                 goto out;
 448         }
 449
 450         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 451         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 452         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 453         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 454         fsopt->congestion_kb = default_congestion_kb();
 455
 456         /*
 457          * Distinguish the server list from the path in "dev_name".
 458          * Internally we do not include the leading '/' in the path.
 459          *
 460          * "dev_name" will look like:
 461          *     <server_spec>[,<server_spec>...]:[<path>]
 462          * where
 463          *     <server_spec> is <ip>[:<port>]
 464          *     <path> is optional, but if present must begin with '/'
 465          */
 466         dev_name_end = strchr(dev_name, '/');
 467         if (dev_name_end) {
 468                 if (strlen(dev_name_end) > 1) {
 469                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 470                         if (!fsopt->server_path) {
 471                                 err = -ENOMEM;
 472                                 goto out;
 473                         }
 474                 }
 475         } else {
 476                 dev_name_end = dev_name + strlen(dev_name);
 477         }
 478         err = -EINVAL;
 479         dev_name_end--;         /* back up to ':' separator */
 480         if (dev_name_end < dev_name || *dev_name_end != ':') {
 481                 pr_err("device name is missing path (no : separator in %s)\n",
 482                                 dev_name);
 483                 goto out;
 484         }
 485         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 486         if (fsopt->server_path)
 487                 dout("server path '%s'\n", fsopt->server_path);
 488
 489         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 490                                  parse_fsopt_token, (void *)fsopt);
 491         if (IS_ERR(*popt)) {
 492                 err = PTR_ERR(*popt);
 493                 goto out;
 494         }
 495
 496         /* success */
 497         *pfsopt = fsopt;
 498         return 0;
 499
 500 out:
 501         destroy_mount_options(fsopt);
 502         return err;
 503 }
 504
 505 /**
 506  * ceph_show_options - Show mount options in /proc/mounts
 507  * @m: seq_file to write to
 508  * @root: root of that (sub)tree
 509  */
 510 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 511 {
 512         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 513         struct ceph_mount_options *fsopt = fsc->mount_options;
 514         size_t pos;
 515         int ret;
 516
 517         /* a comma between MNT/MS and client options */
 518         seq_putc(m, ',');
 519         pos = m->count;
 520
 521         ret = ceph_print_client_options(m, fsc->client);
 522         if (ret)
 523                 return ret;
 524
 525         /* retract our comma if no client options */
 526         if (m->count == pos)
 527                 m->count--;
 528
 529         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 530                 seq_puts(m, ",dirstat");
 531         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 532                 seq_puts(m, ",rbytes");
 533         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 534                 seq_puts(m, ",noasyncreaddir");
 535         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 536                 seq_puts(m, ",nodcache");
 537         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 538                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 539         }
 540         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 541                 seq_puts(m, ",nopoolperm");
 542         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 543                 seq_puts(m, ",noquotadf");
 544
 545 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 546         if (fsopt->sb_flags & SB_POSIXACL)
 547                 seq_puts(m, ",acl");
 548         else
 549                 seq_puts(m, ",noacl");
 550 #endif
 551
 552         if (fsopt->mds_namespace)
 553                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 554         if (fsopt->wsize)
 555                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 556         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 557                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 558         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 559                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 560         if (fsopt->congestion_kb != default_congestion_kb())
 561                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 562         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 563                 seq_printf(m, ",caps_wanted_delay_min=%d",
 564                          fsopt->caps_wanted_delay_min);
 565         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 566                 seq_printf(m, ",caps_wanted_delay_max=%d",
 567                            fsopt->caps_wanted_delay_max);
 568         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 569                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 570         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 571                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 572         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 573                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 574
 575         return 0;
 576 }
 577
 578 /*
 579  * handle any mon messages the standard library doesn't understand.
 580  * return error if we don't either.
 581  */
 582 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 583 {
 584         struct ceph_fs_client *fsc = client->private;
 585         int type = le16_to_cpu(msg->hdr.type);
 586
 587         switch (type) {
 588         case CEPH_MSG_MDS_MAP:
 589                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 590                 return 0;
 591         case CEPH_MSG_FS_MAP_USER:
 592                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 593                 return 0;
 594         default:
 595                 return -1;
 596         }
 597 }
 598
 599 /*
 600  * create a new fs client
 601  */
 602 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 603                                         struct ceph_options *opt)
 604 {
 605         struct ceph_fs_client *fsc;
 606         int page_count;
 607         size_t size;
 608         int err = -ENOMEM;
 609
 610         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 611         if (!fsc)
 612                 return ERR_PTR(-ENOMEM);
 613
 614         fsc->client = ceph_create_client(opt, fsc);
 615         if (IS_ERR(fsc->client)) {
 616                 err = PTR_ERR(fsc->client);
 617                 goto fail;
 618         }
 619         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 620
 621         if (!fsopt->mds_namespace) {
 622                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 623                                    0, true);
 624         } else {
 625                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 626                                    0, false);
 627         }
 628
 629         fsc->mount_options = fsopt;
 630
 631         fsc->sb = NULL;
 632         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 633
 634         atomic_long_set(&fsc->writeback_count, 0);
 635
 636         err = -ENOMEM;
 637         /*
 638          * The number of concurrent works can be high but they don't need
 639          * to be processed in parallel, limit concurrency.
 640          */
 641         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 642         if (!fsc->wb_wq)
 643                 goto fail_client;
 644         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 645         if (!fsc->pg_inv_wq)
 646                 goto fail_wb_wq;
 647         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 648         if (!fsc->trunc_wq)
 649                 goto fail_pg_inv_wq;
 650
 651         /* set up mempools */
 652         err = -ENOMEM;
 653         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 654         size = sizeof (struct page *) * (page_count ? page_count : 1);
 655         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 656         if (!fsc->wb_pagevec_pool)
 657                 goto fail_trunc_wq;
 658
 659         /* caps */
 660         fsc->min_caps = fsopt->max_readdir;
 661
 662         return fsc;
 663
 664 fail_trunc_wq:
 665         destroy_workqueue(fsc->trunc_wq);
 666 fail_pg_inv_wq:
 667         destroy_workqueue(fsc->pg_inv_wq);
 668 fail_wb_wq:
 669         destroy_workqueue(fsc->wb_wq);
 670 fail_client:
 671         ceph_destroy_client(fsc->client);
 672 fail:
 673         kfree(fsc);
 674         return ERR_PTR(err);
 675 }
 676
 677 static void destroy_fs_client(struct ceph_fs_client *fsc)
 678 {
 679         dout("destroy_fs_client %p\n", fsc);
 680
 681         destroy_workqueue(fsc->wb_wq);
 682         destroy_workqueue(fsc->pg_inv_wq);
 683         destroy_workqueue(fsc->trunc_wq);
 684
 685         mempool_destroy(fsc->wb_pagevec_pool);
 686
 687         destroy_mount_options(fsc->mount_options);
 688
 689         ceph_destroy_client(fsc->client);
 690
 691         kfree(fsc);
 692         dout("destroy_fs_client %p done\n", fsc);
 693 }
 694
 695 /*
 696  * caches
 697  */
 698 struct kmem_cache *ceph_inode_cachep;
 699 struct kmem_cache *ceph_cap_cachep;
 700 struct kmem_cache *ceph_cap_flush_cachep;
 701 struct kmem_cache *ceph_dentry_cachep;
 702 struct kmem_cache *ceph_file_cachep;
 703 struct kmem_cache *ceph_dir_file_cachep;
 704
 705 static void ceph_inode_init_once(void *foo)
 706 {
 707         struct ceph_inode_info *ci = foo;
 708         inode_init_once(&ci->vfs_inode);
 709 }
 710
 711 static int __init init_caches(void)
 712 {
 713         int error = -ENOMEM;
 714
 715         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 716                                       sizeof(struct ceph_inode_info),
 717                                       __alignof__(struct ceph_inode_info),
 718                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 719                                       SLAB_ACCOUNT, ceph_inode_init_once);
 720         if (!ceph_inode_cachep)
 721                 return -ENOMEM;
 722
 723         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 724         if (!ceph_cap_cachep)
 725                 goto bad_cap;
 726         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 727                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 728         if (!ceph_cap_flush_cachep)
 729                 goto bad_cap_flush;
 730
 731         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 732                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 733         if (!ceph_dentry_cachep)
 734                 goto bad_dentry;
 735
 736         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 737         if (!ceph_file_cachep)
 738                 goto bad_file;
 739
 740         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 741         if (!ceph_dir_file_cachep)
 742                 goto bad_dir_file;
 743
 744         error = ceph_fscache_register();
 745         if (error)
 746                 goto bad_fscache;
 747
 748         return 0;
 749
 750 bad_fscache:
 751         kmem_cache_destroy(ceph_dir_file_cachep);
 752 bad_dir_file:
 753         kmem_cache_destroy(ceph_file_cachep);
 754 bad_file:
 755         kmem_cache_destroy(ceph_dentry_cachep);
 756 bad_dentry:
 757         kmem_cache_destroy(ceph_cap_flush_cachep);
 758 bad_cap_flush:
 759         kmem_cache_destroy(ceph_cap_cachep);
 760 bad_cap:
 761         kmem_cache_destroy(ceph_inode_cachep);
 762         return error;
 763 }
 764
 765 static void destroy_caches(void)
 766 {
 767         /*
 768          * Make sure all delayed rcu free inodes are flushed before we
 769          * destroy cache.
 770          */
 771         rcu_barrier();
 772
 773         kmem_cache_destroy(ceph_inode_cachep);
 774         kmem_cache_destroy(ceph_cap_cachep);
 775         kmem_cache_destroy(ceph_cap_flush_cachep);
 776         kmem_cache_destroy(ceph_dentry_cachep);
 777         kmem_cache_destroy(ceph_file_cachep);
 778         kmem_cache_destroy(ceph_dir_file_cachep);
 779
 780         ceph_fscache_unregister();
 781 }
 782
 783
 784 /*
 785  * ceph_umount_begin - initiate forced umount.  Tear down down the
 786  * mount, skipping steps that may hang while waiting for server(s).
 787  */
 788 static void ceph_umount_begin(struct super_block *sb)
 789 {
 790         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 791
 792         dout("ceph_umount_begin - starting forced umount\n");
 793         if (!fsc)
 794                 return;
 795         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 796         ceph_mdsc_force_umount(fsc->mdsc);
 797         return;
 798 }
 799
 800 static const struct super_operations ceph_super_ops = {
 801         .alloc_inode    = ceph_alloc_inode,
 802         .destroy_inode  = ceph_destroy_inode,
 803         .write_inode    = ceph_write_inode,
 804         .drop_inode     = ceph_drop_inode,
 805         .sync_fs        = ceph_sync_fs,
 806         .put_super      = ceph_put_super,
 807         .show_options   = ceph_show_options,
 808         .statfs         = ceph_statfs,
 809         .umount_begin   = ceph_umount_begin,
 810 };
 811
 812 /*
 813  * Bootstrap mount by opening the root directory.  Note the mount
 814  * @started time from caller, and time out if this takes too long.
 815  */
 816 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 817                                        const char *path,
 818                                        unsigned long started)
 819 {
 820         struct ceph_mds_client *mdsc = fsc->mdsc;
 821         struct ceph_mds_request *req = NULL;
 822         int err;
 823         struct dentry *root;
 824
 825         /* open dir */
 826         dout("open_root_inode opening '%s'\n", path);
 827         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 828         if (IS_ERR(req))
 829                 return ERR_CAST(req);
 830         req->r_path1 = kstrdup(path, GFP_NOFS);
 831         if (!req->r_path1) {
 832                 root = ERR_PTR(-ENOMEM);
 833                 goto out;
 834         }
 835
 836         req->r_ino1.ino = CEPH_INO_ROOT;
 837         req->r_ino1.snap = CEPH_NOSNAP;
 838         req->r_started = started;
 839         req->r_timeout = fsc->client->options->mount_timeout;
 840         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 841         req->r_num_caps = 2;
 842         err = ceph_mdsc_do_request(mdsc, NULL, req);
 843         if (err == 0) {
 844                 struct inode *inode = req->r_target_inode;
 845                 req->r_target_inode = NULL;
 846                 dout("open_root_inode success\n");
 847                 root = d_make_root(inode);
 848                 if (!root) {
 849                         root = ERR_PTR(-ENOMEM);
 850                         goto out;
 851                 }
 852                 dout("open_root_inode success, root dentry is %p\n", root);
 853         } else {
 854                 root = ERR_PTR(err);
 855         }
 856 out:
 857         ceph_mdsc_put_request(req);
 858         return root;
 859 }
 860
 861
 862
 863
 864 /*
 865  * mount: join the ceph cluster, and open root directory.
 866  */
 867 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 868 {
 869         int err;
 870         unsigned long started = jiffies;  /* note the start time */
 871         struct dentry *root;
 872
 873         dout("mount start %p\n", fsc);
 874         mutex_lock(&fsc->client->mount_mutex);
 875
 876         if (!fsc->sb->s_root) {
 877                 const char *path;
 878                 err = __ceph_open_session(fsc->client, started);
 879                 if (err < 0)
 880                         goto out;
 881
 882                 /* setup fscache */
 883                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 884                         err = ceph_fscache_register_fs(fsc);
 885                         if (err < 0)
 886                                 goto out;
 887                 }
 888
 889                 if (!fsc->mount_options->server_path) {
 890                         path = "";
 891                         dout("mount opening path \\t\n");
 892                 } else {
 893                         path = fsc->mount_options->server_path + 1;
 894                         dout("mount opening path %s\n", path);
 895                 }
 896
 897                 err = ceph_fs_debugfs_init(fsc);
 898                 if (err < 0)
 899                         goto out;
 900
 901                 root = open_root_dentry(fsc, path, started);
 902                 if (IS_ERR(root)) {
 903                         err = PTR_ERR(root);
 904                         goto out;
 905                 }
 906                 fsc->sb->s_root = dget(root);
 907         } else {
 908                 root = dget(fsc->sb->s_root);
 909         }
 910
 911         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 912         dout("mount success\n");
 913         mutex_unlock(&fsc->client->mount_mutex);
 914         return root;
 915
 916 out:
 917         mutex_unlock(&fsc->client->mount_mutex);
 918         return ERR_PTR(err);
 919 }
 920
 921 static int ceph_set_super(struct super_block *s, void *data)
 922 {
 923         struct ceph_fs_client *fsc = data;
 924         int ret;
 925
 926         dout("set_super %p data %p\n", s, data);
 927
 928         s->s_flags = fsc->mount_options->sb_flags;
 929         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 930
 931         s->s_xattr = ceph_xattr_handlers;
 932         s->s_fs_info = fsc;
 933         fsc->sb = s;
 934
 935         s->s_op = &ceph_super_ops;
 936         s->s_d_op = &ceph_dentry_ops;
 937         s->s_export_op = &ceph_export_ops;
 938
 939         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 940
 941         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 942         if (ret != 0)
 943                 goto fail;
 944
 945         return ret;
 946
 947 fail:
 948         s->s_fs_info = NULL;
 949         fsc->sb = NULL;
 950         return ret;
 951 }
 952
 953 /*
 954  * share superblock if same fs AND options
 955  */
 956 static int ceph_compare_super(struct super_block *sb, void *data)
 957 {
 958         struct ceph_fs_client *new = data;
 959         struct ceph_mount_options *fsopt = new->mount_options;
 960         struct ceph_options *opt = new->client->options;
 961         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 962
 963         dout("ceph_compare_super %p\n", sb);
 964
 965         if (compare_mount_options(fsopt, opt, other)) {
 966                 dout("monitor(s)/mount options don't match\n");
 967                 return 0;
 968         }
 969         if ((opt->flags & CEPH_OPT_FSID) &&
 970             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 971                 dout("fsid doesn't match\n");
 972                 return 0;
 973         }
 974         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 975                 dout("flags differ\n");
 976                 return 0;
 977         }
 978         return 1;
 979 }
 980
 981 /*
 982  * construct our own bdi so we can control readahead, etc.
 983  */
 984 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 985
 986 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
 987 {
 988         int err;
 989
 990         err = super_setup_bdi_name(sb, "ceph-%ld",
 991                                    atomic_long_inc_return(&bdi_seq));
 992         if (err)
 993                 return err;
 994
 995         /* set ra_pages based on rasize mount option? */
 996         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
 997
 998         /* set io_pages based on max osd read size */
 999         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1000
1001         return 0;
1002 }
1003
1004 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1005                        int flags, const char *dev_name, void *data)
1006 {
1007         struct super_block *sb;
1008         struct ceph_fs_client *fsc;
1009         struct dentry *res;
1010         int err;
1011         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1012         struct ceph_mount_options *fsopt = NULL;
1013         struct ceph_options *opt = NULL;
1014
1015         dout("ceph_mount\n");
1016
1017 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1018         flags |= SB_POSIXACL;
1019 #endif
1020         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1021         if (err < 0) {
1022                 res = ERR_PTR(err);
1023                 goto out_final;
1024         }
1025
1026         /* create client (which we may/may not use) */
1027         fsc = create_fs_client(fsopt, opt);
1028         if (IS_ERR(fsc)) {
1029                 res = ERR_CAST(fsc);
1030                 destroy_mount_options(fsopt);
1031                 ceph_destroy_options(opt);
1032                 goto out_final;
1033         }
1034
1035         err = ceph_mdsc_init(fsc);
1036         if (err < 0) {
1037                 res = ERR_PTR(err);
1038                 goto out;
1039         }
1040
1041         if (ceph_test_opt(fsc->client, NOSHARE))
1042                 compare_super = NULL;
1043         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1044         if (IS_ERR(sb)) {
1045                 res = ERR_CAST(sb);
1046                 goto out;
1047         }
1048
1049         if (ceph_sb_to_client(sb) != fsc) {
1050                 ceph_mdsc_destroy(fsc);
1051                 destroy_fs_client(fsc);
1052                 fsc = ceph_sb_to_client(sb);
1053                 dout("get_sb got existing client %p\n", fsc);
1054         } else {
1055                 dout("get_sb using new client %p\n", fsc);
1056                 err = ceph_setup_bdi(sb, fsc);
1057                 if (err < 0) {
1058                         res = ERR_PTR(err);
1059                         goto out_splat;
1060                 }
1061         }
1062
1063         res = ceph_real_mount(fsc);
1064         if (IS_ERR(res))
1065                 goto out_splat;
1066         dout("root %p inode %p ino %llx.%llx\n", res,
1067              d_inode(res), ceph_vinop(d_inode(res)));
1068         return res;
1069
1070 out_splat:
1071         ceph_mdsc_close_sessions(fsc->mdsc);
1072         deactivate_locked_super(sb);
1073         goto out_final;
1074
1075 out:
1076         ceph_mdsc_destroy(fsc);
1077         destroy_fs_client(fsc);
1078 out_final:
1079         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1080         return res;
1081 }
1082
1083 static void ceph_kill_sb(struct super_block *s)
1084 {
1085         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1086         dev_t dev = s->s_dev;
1087
1088         dout("kill_sb %p\n", s);
1089
1090         ceph_mdsc_pre_umount(fsc->mdsc);
1091         generic_shutdown_super(s);
1092
1093         fsc->client->extra_mon_dispatch = NULL;
1094         ceph_fs_debugfs_cleanup(fsc);
1095
1096         ceph_fscache_unregister_fs(fsc);
1097
1098         ceph_mdsc_destroy(fsc);
1099
1100         destroy_fs_client(fsc);
1101         free_anon_bdev(dev);
1102 }
1103
1104 static struct file_system_type ceph_fs_type = {
1105         .owner          = THIS_MODULE,
1106         .name           = "ceph",
1107         .mount          = ceph_mount,
1108         .kill_sb        = ceph_kill_sb,
1109         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1110 };
1111 MODULE_ALIAS_FS("ceph");
1112
1113 static int __init init_ceph(void)
1114 {
1115         int ret = init_caches();
1116         if (ret)
1117                 goto out;
1118
1119         ceph_flock_init();
1120         ceph_xattr_init();
1121         ret = register_filesystem(&ceph_fs_type);
1122         if (ret)
1123                 goto out_xattr;
1124
1125         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1126
1127         return 0;
1128
1129 out_xattr:
1130         ceph_xattr_exit();
1131         destroy_caches();
1132 out:
1133         return ret;
1134 }
1135
1136 static void __exit exit_ceph(void)
1137 {
1138         dout("exit_ceph\n");
1139         unregister_filesystem(&ceph_fs_type);
1140         ceph_xattr_exit();
1141         destroy_caches();
1142 }
1143
1144 module_init(init_ceph);
1145 module_exit(exit_ceph);
1146
1147 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1148 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1149 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1150 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1151 MODULE_LICENSE("GPL");