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         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  80         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  81         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  82
  83         buf->f_files = le64_to_cpu(st.num_objects);
  84         buf->f_ffree = -1;
  85         buf->f_namelen = NAME_MAX;
  86
  87         /* Must convert the fsid, for consistent values across arches */
  88         fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^
  89                le64_to_cpu(*((__le64 *)&monmap->fsid + 1));
  90         buf->f_fsid.val[0] = fsid & 0xffffffff;
  91         buf->f_fsid.val[1] = fsid >> 32;
  92
  93         return 0;
  94 }
  95
  96
  97 static int ceph_sync_fs(struct super_block *sb, int wait)
  98 {
  99         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 100
 101         if (!wait) {
 102                 dout("sync_fs (non-blocking)\n");
 103                 ceph_flush_dirty_caps(fsc->mdsc);
 104                 dout("sync_fs (non-blocking) done\n");
 105                 return 0;
 106         }
 107
 108         dout("sync_fs (blocking)\n");
 109         ceph_osdc_sync(&fsc->client->osdc);
 110         ceph_mdsc_sync(fsc->mdsc);
 111         dout("sync_fs (blocking) done\n");
 112         return 0;
 113 }
 114
 115 /*
 116  * mount options
 117  */
 118 enum {
 119         Opt_wsize,
 120         Opt_rsize,
 121         Opt_rasize,
 122         Opt_caps_wanted_delay_min,
 123         Opt_caps_wanted_delay_max,
 124         Opt_readdir_max_entries,
 125         Opt_readdir_max_bytes,
 126         Opt_congestion_kb,
 127         Opt_last_int,
 128         /* int args above */
 129         Opt_snapdirname,
 130         Opt_mds_namespace,
 131         Opt_fscache_uniq,
 132         Opt_last_string,
 133         /* string args above */
 134         Opt_dirstat,
 135         Opt_nodirstat,
 136         Opt_rbytes,
 137         Opt_norbytes,
 138         Opt_asyncreaddir,
 139         Opt_noasyncreaddir,
 140         Opt_dcache,
 141         Opt_nodcache,
 142         Opt_ino32,
 143         Opt_noino32,
 144         Opt_fscache,
 145         Opt_nofscache,
 146         Opt_poolperm,
 147         Opt_nopoolperm,
 148         Opt_require_active_mds,
 149         Opt_norequire_active_mds,
 150 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 151         Opt_acl,
 152 #endif
 153         Opt_noacl,
 154 };
 155
 156 static match_table_t fsopt_tokens = {
 157         {Opt_wsize, "wsize=%d"},
 158         {Opt_rsize, "rsize=%d"},
 159         {Opt_rasize, "rasize=%d"},
 160         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 161         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 162         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 163         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 164         {Opt_congestion_kb, "write_congestion_kb=%d"},
 165         /* int args above */
 166         {Opt_snapdirname, "snapdirname=%s"},
 167         {Opt_mds_namespace, "mds_namespace=%s"},
 168         {Opt_fscache_uniq, "fsc=%s"},
 169         /* string args above */
 170         {Opt_dirstat, "dirstat"},
 171         {Opt_nodirstat, "nodirstat"},
 172         {Opt_rbytes, "rbytes"},
 173         {Opt_norbytes, "norbytes"},
 174         {Opt_asyncreaddir, "asyncreaddir"},
 175         {Opt_noasyncreaddir, "noasyncreaddir"},
 176         {Opt_dcache, "dcache"},
 177         {Opt_nodcache, "nodcache"},
 178         {Opt_ino32, "ino32"},
 179         {Opt_noino32, "noino32"},
 180         {Opt_fscache, "fsc"},
 181         {Opt_nofscache, "nofsc"},
 182         {Opt_poolperm, "poolperm"},
 183         {Opt_nopoolperm, "nopoolperm"},
 184         {Opt_require_active_mds, "require_active_mds"},
 185         {Opt_norequire_active_mds, "norequire_active_mds"},
 186 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 187         {Opt_acl, "acl"},
 188 #endif
 189         {Opt_noacl, "noacl"},
 190         {-1, NULL}
 191 };
 192
 193 static int parse_fsopt_token(char *c, void *private)
 194 {
 195         struct ceph_mount_options *fsopt = private;
 196         substring_t argstr[MAX_OPT_ARGS];
 197         int token, intval, ret;
 198
 199         token = match_token((char *)c, fsopt_tokens, argstr);
 200         if (token < 0)
 201                 return -EINVAL;
 202
 203         if (token < Opt_last_int) {
 204                 ret = match_int(&argstr[0], &intval);
 205                 if (ret < 0) {
 206                         pr_err("bad mount option arg (not int) "
 207                                "at '%s'\n", c);
 208                         return ret;
 209                 }
 210                 dout("got int token %d val %d\n", token, intval);
 211         } else if (token > Opt_last_int && token < Opt_last_string) {
 212                 dout("got string token %d val %s\n", token,
 213                      argstr[0].from);
 214         } else {
 215                 dout("got token %d\n", token);
 216         }
 217
 218         switch (token) {
 219         case Opt_snapdirname:
 220                 kfree(fsopt->snapdir_name);
 221                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 222                                                argstr[0].to-argstr[0].from,
 223                                                GFP_KERNEL);
 224                 if (!fsopt->snapdir_name)
 225                         return -ENOMEM;
 226                 break;
 227         case Opt_mds_namespace:
 228                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 229                                                 argstr[0].to-argstr[0].from,
 230                                                 GFP_KERNEL);
 231                 if (!fsopt->mds_namespace)
 232                         return -ENOMEM;
 233                 break;
 234         case Opt_fscache_uniq:
 235                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 236                                                argstr[0].to-argstr[0].from,
 237                                                GFP_KERNEL);
 238                 if (!fsopt->fscache_uniq)
 239                         return -ENOMEM;
 240                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 241                 break;
 242                 /* misc */
 243         case Opt_wsize:
 244                 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 245                         return -EINVAL;
 246                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 247                 break;
 248         case Opt_rsize:
 249                 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 250                         return -EINVAL;
 251                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 252                 break;
 253         case Opt_rasize:
 254                 if (intval < 0)
 255                         return -EINVAL;
 256                 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
 257                 break;
 258         case Opt_caps_wanted_delay_min:
 259                 if (intval < 1)
 260                         return -EINVAL;
 261                 fsopt->caps_wanted_delay_min = intval;
 262                 break;
 263         case Opt_caps_wanted_delay_max:
 264                 if (intval < 1)
 265                         return -EINVAL;
 266                 fsopt->caps_wanted_delay_max = intval;
 267                 break;
 268         case Opt_readdir_max_entries:
 269                 if (intval < 1)
 270                         return -EINVAL;
 271                 fsopt->max_readdir = intval;
 272                 break;
 273         case Opt_readdir_max_bytes:
 274                 if (intval < PAGE_SIZE && intval != 0)
 275                         return -EINVAL;
 276                 fsopt->max_readdir_bytes = intval;
 277                 break;
 278         case Opt_congestion_kb:
 279                 if (intval < 1024) /* at least 1M */
 280                         return -EINVAL;
 281                 fsopt->congestion_kb = intval;
 282                 break;
 283         case Opt_dirstat:
 284                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 285                 break;
 286         case Opt_nodirstat:
 287                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 288                 break;
 289         case Opt_rbytes:
 290                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 291                 break;
 292         case Opt_norbytes:
 293                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 294                 break;
 295         case Opt_asyncreaddir:
 296                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 297                 break;
 298         case Opt_noasyncreaddir:
 299                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 300                 break;
 301         case Opt_dcache:
 302                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 303                 break;
 304         case Opt_nodcache:
 305                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 306                 break;
 307         case Opt_ino32:
 308                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 309                 break;
 310         case Opt_noino32:
 311                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 312                 break;
 313         case Opt_fscache:
 314                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 315                 break;
 316         case Opt_nofscache:
 317                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 318                 break;
 319         case Opt_poolperm:
 320                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 321                 printk ("pool perm");
 322                 break;
 323         case Opt_nopoolperm:
 324                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 325                 break;
 326         case Opt_require_active_mds:
 327                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 328                 break;
 329         case Opt_norequire_active_mds:
 330                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 331                 break;
 332 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 333         case Opt_acl:
 334                 fsopt->sb_flags |= SB_POSIXACL;
 335                 break;
 336 #endif
 337         case Opt_noacl:
 338                 fsopt->sb_flags &= ~SB_POSIXACL;
 339                 break;
 340         default:
 341                 BUG_ON(token);
 342         }
 343         return 0;
 344 }
 345
 346 static void destroy_mount_options(struct ceph_mount_options *args)
 347 {
 348         dout("destroy_mount_options %p\n", args);
 349         kfree(args->snapdir_name);
 350         kfree(args->mds_namespace);
 351         kfree(args->server_path);
 352         kfree(args->fscache_uniq);
 353         kfree(args);
 354 }
 355
 356 static int strcmp_null(const char *s1, const char *s2)
 357 {
 358         if (!s1 && !s2)
 359                 return 0;
 360         if (s1 && !s2)
 361                 return -1;
 362         if (!s1 && s2)
 363                 return 1;
 364         return strcmp(s1, s2);
 365 }
 366
 367 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 368                                  struct ceph_options *new_opt,
 369                                  struct ceph_fs_client *fsc)
 370 {
 371         struct ceph_mount_options *fsopt1 = new_fsopt;
 372         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 373         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 374         int ret;
 375
 376         ret = memcmp(fsopt1, fsopt2, ofs);
 377         if (ret)
 378                 return ret;
 379
 380         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 381         if (ret)
 382                 return ret;
 383         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 384         if (ret)
 385                 return ret;
 386         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 387         if (ret)
 388                 return ret;
 389         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 390         if (ret)
 391                 return ret;
 392
 393         return ceph_compare_options(new_opt, fsc->client);
 394 }
 395
 396 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 397                                struct ceph_options **popt,
 398                                int flags, char *options,
 399                                const char *dev_name)
 400 {
 401         struct ceph_mount_options *fsopt;
 402         const char *dev_name_end;
 403         int err;
 404
 405         if (!dev_name || !*dev_name)
 406                 return -EINVAL;
 407
 408         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 409         if (!fsopt)
 410                 return -ENOMEM;
 411
 412         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 413
 414         fsopt->sb_flags = flags;
 415         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 416
 417         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 418         fsopt->rsize = CEPH_MAX_READ_SIZE;
 419         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 420         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 421         if (!fsopt->snapdir_name) {
 422                 err = -ENOMEM;
 423                 goto out;
 424         }
 425
 426         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 427         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 428         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 429         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 430         fsopt->congestion_kb = default_congestion_kb();
 431
 432         /*
 433          * Distinguish the server list from the path in "dev_name".
 434          * Internally we do not include the leading '/' in the path.
 435          *
 436          * "dev_name" will look like:
 437          *     <server_spec>[,<server_spec>...]:[<path>]
 438          * where
 439          *     <server_spec> is <ip>[:<port>]
 440          *     <path> is optional, but if present must begin with '/'
 441          */
 442         dev_name_end = strchr(dev_name, '/');
 443         if (dev_name_end) {
 444                 if (strlen(dev_name_end) > 1) {
 445                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 446                         if (!fsopt->server_path) {
 447                                 err = -ENOMEM;
 448                                 goto out;
 449                         }
 450                 }
 451         } else {
 452                 dev_name_end = dev_name + strlen(dev_name);
 453         }
 454         err = -EINVAL;
 455         dev_name_end--;         /* back up to ':' separator */
 456         if (dev_name_end < dev_name || *dev_name_end != ':') {
 457                 pr_err("device name is missing path (no : separator in %s)\n",
 458                                 dev_name);
 459                 goto out;
 460         }
 461         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 462         if (fsopt->server_path)
 463                 dout("server path '%s'\n", fsopt->server_path);
 464
 465         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 466                                  parse_fsopt_token, (void *)fsopt);
 467         if (IS_ERR(*popt)) {
 468                 err = PTR_ERR(*popt);
 469                 goto out;
 470         }
 471
 472         /* success */
 473         *pfsopt = fsopt;
 474         return 0;
 475
 476 out:
 477         destroy_mount_options(fsopt);
 478         return err;
 479 }
 480
 481 /**
 482  * ceph_show_options - Show mount options in /proc/mounts
 483  * @m: seq_file to write to
 484  * @root: root of that (sub)tree
 485  */
 486 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 487 {
 488         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 489         struct ceph_mount_options *fsopt = fsc->mount_options;
 490         size_t pos;
 491         int ret;
 492
 493         /* a comma between MNT/MS and client options */
 494         seq_putc(m, ',');
 495         pos = m->count;
 496
 497         ret = ceph_print_client_options(m, fsc->client);
 498         if (ret)
 499                 return ret;
 500
 501         /* retract our comma if no client options */
 502         if (m->count == pos)
 503                 m->count--;
 504
 505         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 506                 seq_puts(m, ",dirstat");
 507         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 508                 seq_puts(m, ",rbytes");
 509         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 510                 seq_puts(m, ",noasyncreaddir");
 511         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 512                 seq_puts(m, ",nodcache");
 513         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 514                 if (fsopt->fscache_uniq)
 515                         seq_printf(m, ",fsc=%s", fsopt->fscache_uniq);
 516                 else
 517                         seq_puts(m, ",fsc");
 518         }
 519         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 520                 seq_puts(m, ",nopoolperm");
 521
 522 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 523         if (fsopt->sb_flags & SB_POSIXACL)
 524                 seq_puts(m, ",acl");
 525         else
 526                 seq_puts(m, ",noacl");
 527 #endif
 528
 529         if (fsopt->mds_namespace)
 530                 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
 531         if (fsopt->wsize)
 532                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 533         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 534                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 535         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 536                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 537         if (fsopt->congestion_kb != default_congestion_kb())
 538                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 539         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 540                 seq_printf(m, ",caps_wanted_delay_min=%d",
 541                          fsopt->caps_wanted_delay_min);
 542         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 543                 seq_printf(m, ",caps_wanted_delay_max=%d",
 544                            fsopt->caps_wanted_delay_max);
 545         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 546                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 547         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 548                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 549         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 550                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 551
 552         return 0;
 553 }
 554
 555 /*
 556  * handle any mon messages the standard library doesn't understand.
 557  * return error if we don't either.
 558  */
 559 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 560 {
 561         struct ceph_fs_client *fsc = client->private;
 562         int type = le16_to_cpu(msg->hdr.type);
 563
 564         switch (type) {
 565         case CEPH_MSG_MDS_MAP:
 566                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 567                 return 0;
 568         case CEPH_MSG_FS_MAP_USER:
 569                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 570                 return 0;
 571         default:
 572                 return -1;
 573         }
 574 }
 575
 576 /*
 577  * create a new fs client
 578  */
 579 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 580                                         struct ceph_options *opt)
 581 {
 582         struct ceph_fs_client *fsc;
 583         int page_count;
 584         size_t size;
 585         int err = -ENOMEM;
 586
 587         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 588         if (!fsc)
 589                 return ERR_PTR(-ENOMEM);
 590
 591         fsc->client = ceph_create_client(opt, fsc);
 592         if (IS_ERR(fsc->client)) {
 593                 err = PTR_ERR(fsc->client);
 594                 goto fail;
 595         }
 596         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 597
 598         if (!fsopt->mds_namespace) {
 599                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 600                                    0, true);
 601         } else {
 602                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 603                                    0, false);
 604         }
 605
 606         fsc->mount_options = fsopt;
 607
 608         fsc->sb = NULL;
 609         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 610
 611         atomic_long_set(&fsc->writeback_count, 0);
 612
 613         err = -ENOMEM;
 614         /*
 615          * The number of concurrent works can be high but they don't need
 616          * to be processed in parallel, limit concurrency.
 617          */
 618         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 619         if (!fsc->wb_wq)
 620                 goto fail_client;
 621         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 622         if (!fsc->pg_inv_wq)
 623                 goto fail_wb_wq;
 624         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 625         if (!fsc->trunc_wq)
 626                 goto fail_pg_inv_wq;
 627
 628         /* set up mempools */
 629         err = -ENOMEM;
 630         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 631         size = sizeof (struct page *) * (page_count ? page_count : 1);
 632         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 633         if (!fsc->wb_pagevec_pool)
 634                 goto fail_trunc_wq;
 635
 636         /* caps */
 637         fsc->min_caps = fsopt->max_readdir;
 638
 639         return fsc;
 640
 641 fail_trunc_wq:
 642         destroy_workqueue(fsc->trunc_wq);
 643 fail_pg_inv_wq:
 644         destroy_workqueue(fsc->pg_inv_wq);
 645 fail_wb_wq:
 646         destroy_workqueue(fsc->wb_wq);
 647 fail_client:
 648         ceph_destroy_client(fsc->client);
 649 fail:
 650         kfree(fsc);
 651         return ERR_PTR(err);
 652 }
 653
 654 static void destroy_fs_client(struct ceph_fs_client *fsc)
 655 {
 656         dout("destroy_fs_client %p\n", fsc);
 657
 658         destroy_workqueue(fsc->wb_wq);
 659         destroy_workqueue(fsc->pg_inv_wq);
 660         destroy_workqueue(fsc->trunc_wq);
 661
 662         mempool_destroy(fsc->wb_pagevec_pool);
 663
 664         destroy_mount_options(fsc->mount_options);
 665
 666         ceph_destroy_client(fsc->client);
 667
 668         kfree(fsc);
 669         dout("destroy_fs_client %p done\n", fsc);
 670 }
 671
 672 /*
 673  * caches
 674  */
 675 struct kmem_cache *ceph_inode_cachep;
 676 struct kmem_cache *ceph_cap_cachep;
 677 struct kmem_cache *ceph_cap_flush_cachep;
 678 struct kmem_cache *ceph_dentry_cachep;
 679 struct kmem_cache *ceph_file_cachep;
 680
 681 static void ceph_inode_init_once(void *foo)
 682 {
 683         struct ceph_inode_info *ci = foo;
 684         inode_init_once(&ci->vfs_inode);
 685 }
 686
 687 static int __init init_caches(void)
 688 {
 689         int error = -ENOMEM;
 690
 691         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 692                                       sizeof(struct ceph_inode_info),
 693                                       __alignof__(struct ceph_inode_info),
 694                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 695                                       SLAB_ACCOUNT, ceph_inode_init_once);
 696         if (!ceph_inode_cachep)
 697                 return -ENOMEM;
 698
 699         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 700                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 701         if (!ceph_cap_cachep)
 702                 goto bad_cap;
 703         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 704                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 705         if (!ceph_cap_flush_cachep)
 706                 goto bad_cap_flush;
 707
 708         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 709                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 710         if (!ceph_dentry_cachep)
 711                 goto bad_dentry;
 712
 713         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 714
 715         if (!ceph_file_cachep)
 716                 goto bad_file;
 717
 718         if ((error = ceph_fscache_register()))
 719                 goto bad_file;
 720
 721         return 0;
 722 bad_file:
 723         kmem_cache_destroy(ceph_dentry_cachep);
 724 bad_dentry:
 725         kmem_cache_destroy(ceph_cap_flush_cachep);
 726 bad_cap_flush:
 727         kmem_cache_destroy(ceph_cap_cachep);
 728 bad_cap:
 729         kmem_cache_destroy(ceph_inode_cachep);
 730         return error;
 731 }
 732
 733 static void destroy_caches(void)
 734 {
 735         /*
 736          * Make sure all delayed rcu free inodes are flushed before we
 737          * destroy cache.
 738          */
 739         rcu_barrier();
 740
 741         kmem_cache_destroy(ceph_inode_cachep);
 742         kmem_cache_destroy(ceph_cap_cachep);
 743         kmem_cache_destroy(ceph_cap_flush_cachep);
 744         kmem_cache_destroy(ceph_dentry_cachep);
 745         kmem_cache_destroy(ceph_file_cachep);
 746
 747         ceph_fscache_unregister();
 748 }
 749
 750
 751 /*
 752  * ceph_umount_begin - initiate forced umount.  Tear down down the
 753  * mount, skipping steps that may hang while waiting for server(s).
 754  */
 755 static void ceph_umount_begin(struct super_block *sb)
 756 {
 757         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 758
 759         dout("ceph_umount_begin - starting forced umount\n");
 760         if (!fsc)
 761                 return;
 762         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 763         ceph_mdsc_force_umount(fsc->mdsc);
 764         return;
 765 }
 766
 767 static const struct super_operations ceph_super_ops = {
 768         .alloc_inode    = ceph_alloc_inode,
 769         .destroy_inode  = ceph_destroy_inode,
 770         .write_inode    = ceph_write_inode,
 771         .drop_inode     = ceph_drop_inode,
 772         .sync_fs        = ceph_sync_fs,
 773         .put_super      = ceph_put_super,
 774         .show_options   = ceph_show_options,
 775         .statfs         = ceph_statfs,
 776         .umount_begin   = ceph_umount_begin,
 777 };
 778
 779 /*
 780  * Bootstrap mount by opening the root directory.  Note the mount
 781  * @started time from caller, and time out if this takes too long.
 782  */
 783 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 784                                        const char *path,
 785                                        unsigned long started)
 786 {
 787         struct ceph_mds_client *mdsc = fsc->mdsc;
 788         struct ceph_mds_request *req = NULL;
 789         int err;
 790         struct dentry *root;
 791
 792         /* open dir */
 793         dout("open_root_inode opening '%s'\n", path);
 794         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 795         if (IS_ERR(req))
 796                 return ERR_CAST(req);
 797         req->r_path1 = kstrdup(path, GFP_NOFS);
 798         if (!req->r_path1) {
 799                 root = ERR_PTR(-ENOMEM);
 800                 goto out;
 801         }
 802
 803         req->r_ino1.ino = CEPH_INO_ROOT;
 804         req->r_ino1.snap = CEPH_NOSNAP;
 805         req->r_started = started;
 806         req->r_timeout = fsc->client->options->mount_timeout;
 807         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 808         req->r_num_caps = 2;
 809         err = ceph_mdsc_do_request(mdsc, NULL, req);
 810         if (err == 0) {
 811                 struct inode *inode = req->r_target_inode;
 812                 req->r_target_inode = NULL;
 813                 dout("open_root_inode success\n");
 814                 root = d_make_root(inode);
 815                 if (!root) {
 816                         root = ERR_PTR(-ENOMEM);
 817                         goto out;
 818                 }
 819                 dout("open_root_inode success, root dentry is %p\n", root);
 820         } else {
 821                 root = ERR_PTR(err);
 822         }
 823 out:
 824         ceph_mdsc_put_request(req);
 825         return root;
 826 }
 827
 828
 829
 830
 831 /*
 832  * mount: join the ceph cluster, and open root directory.
 833  */
 834 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 835 {
 836         int err;
 837         unsigned long started = jiffies;  /* note the start time */
 838         struct dentry *root;
 839         int first = 0;   /* first vfsmount for this super_block */
 840
 841         dout("mount start %p\n", fsc);
 842         mutex_lock(&fsc->client->mount_mutex);
 843
 844         if (!fsc->sb->s_root) {
 845                 const char *path;
 846                 err = __ceph_open_session(fsc->client, started);
 847                 if (err < 0)
 848                         goto out;
 849
 850                 /* setup fscache */
 851                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 852                         err = ceph_fscache_register_fs(fsc);
 853                         if (err < 0)
 854                                 goto out;
 855                 }
 856
 857                 if (!fsc->mount_options->server_path) {
 858                         path = "";
 859                         dout("mount opening path \\t\n");
 860                 } else {
 861                         path = fsc->mount_options->server_path + 1;
 862                         dout("mount opening path %s\n", path);
 863                 }
 864                 root = open_root_dentry(fsc, path, started);
 865                 if (IS_ERR(root)) {
 866                         err = PTR_ERR(root);
 867                         goto out;
 868                 }
 869                 fsc->sb->s_root = dget(root);
 870                 first = 1;
 871
 872                 err = ceph_fs_debugfs_init(fsc);
 873                 if (err < 0)
 874                         goto fail;
 875         } else {
 876                 root = dget(fsc->sb->s_root);
 877         }
 878
 879         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 880         dout("mount success\n");
 881         mutex_unlock(&fsc->client->mount_mutex);
 882         return root;
 883
 884 fail:
 885         if (first) {
 886                 dput(fsc->sb->s_root);
 887                 fsc->sb->s_root = NULL;
 888         }
 889 out:
 890         mutex_unlock(&fsc->client->mount_mutex);
 891         return ERR_PTR(err);
 892 }
 893
 894 static int ceph_set_super(struct super_block *s, void *data)
 895 {
 896         struct ceph_fs_client *fsc = data;
 897         int ret;
 898
 899         dout("set_super %p data %p\n", s, data);
 900
 901         s->s_flags = fsc->mount_options->sb_flags;
 902         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 903
 904         s->s_xattr = ceph_xattr_handlers;
 905         s->s_fs_info = fsc;
 906         fsc->sb = s;
 907
 908         s->s_op = &ceph_super_ops;
 909         s->s_d_op = &ceph_dentry_ops;
 910         s->s_export_op = &ceph_export_ops;
 911
 912         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 913
 914         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 915         if (ret != 0)
 916                 goto fail;
 917
 918         return ret;
 919
 920 fail:
 921         s->s_fs_info = NULL;
 922         fsc->sb = NULL;
 923         return ret;
 924 }
 925
 926 /*
 927  * share superblock if same fs AND options
 928  */
 929 static int ceph_compare_super(struct super_block *sb, void *data)
 930 {
 931         struct ceph_fs_client *new = data;
 932         struct ceph_mount_options *fsopt = new->mount_options;
 933         struct ceph_options *opt = new->client->options;
 934         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 935
 936         dout("ceph_compare_super %p\n", sb);
 937
 938         if (compare_mount_options(fsopt, opt, other)) {
 939                 dout("monitor(s)/mount options don't match\n");
 940                 return 0;
 941         }
 942         if ((opt->flags & CEPH_OPT_FSID) &&
 943             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 944                 dout("fsid doesn't match\n");
 945                 return 0;
 946         }
 947         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 948                 dout("flags differ\n");
 949                 return 0;
 950         }
 951         return 1;
 952 }
 953
 954 /*
 955  * construct our own bdi so we can control readahead, etc.
 956  */
 957 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 958
 959 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
 960 {
 961         int err;
 962
 963         err = super_setup_bdi_name(sb, "ceph-%ld",
 964                                    atomic_long_inc_return(&bdi_seq));
 965         if (err)
 966                 return err;
 967
 968         /* set ra_pages based on rasize mount option? */
 969         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
 970
 971         /* set io_pages based on max osd read size */
 972         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
 973
 974         return 0;
 975 }
 976
 977 static struct dentry *ceph_mount(struct file_system_type *fs_type,
 978                        int flags, const char *dev_name, void *data)
 979 {
 980         struct super_block *sb;
 981         struct ceph_fs_client *fsc;
 982         struct dentry *res;
 983         int err;
 984         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 985         struct ceph_mount_options *fsopt = NULL;
 986         struct ceph_options *opt = NULL;
 987
 988         dout("ceph_mount\n");
 989
 990 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 991         flags |= SB_POSIXACL;
 992 #endif
 993         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
 994         if (err < 0) {
 995                 res = ERR_PTR(err);
 996                 goto out_final;
 997         }
 998
 999         /* create client (which we may/may not use) */
1000         fsc = create_fs_client(fsopt, opt);
1001         if (IS_ERR(fsc)) {
1002                 res = ERR_CAST(fsc);
1003                 destroy_mount_options(fsopt);
1004                 ceph_destroy_options(opt);
1005                 goto out_final;
1006         }
1007
1008         err = ceph_mdsc_init(fsc);
1009         if (err < 0) {
1010                 res = ERR_PTR(err);
1011                 goto out;
1012         }
1013
1014         if (ceph_test_opt(fsc->client, NOSHARE))
1015                 compare_super = NULL;
1016         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1017         if (IS_ERR(sb)) {
1018                 res = ERR_CAST(sb);
1019                 goto out;
1020         }
1021
1022         if (ceph_sb_to_client(sb) != fsc) {
1023                 ceph_mdsc_destroy(fsc);
1024                 destroy_fs_client(fsc);
1025                 fsc = ceph_sb_to_client(sb);
1026                 dout("get_sb got existing client %p\n", fsc);
1027         } else {
1028                 dout("get_sb using new client %p\n", fsc);
1029                 err = ceph_setup_bdi(sb, fsc);
1030                 if (err < 0) {
1031                         res = ERR_PTR(err);
1032                         goto out_splat;
1033                 }
1034         }
1035
1036         res = ceph_real_mount(fsc);
1037         if (IS_ERR(res))
1038                 goto out_splat;
1039         dout("root %p inode %p ino %llx.%llx\n", res,
1040              d_inode(res), ceph_vinop(d_inode(res)));
1041         return res;
1042
1043 out_splat:
1044         ceph_mdsc_close_sessions(fsc->mdsc);
1045         deactivate_locked_super(sb);
1046         goto out_final;
1047
1048 out:
1049         ceph_mdsc_destroy(fsc);
1050         destroy_fs_client(fsc);
1051 out_final:
1052         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1053         return res;
1054 }
1055
1056 static void ceph_kill_sb(struct super_block *s)
1057 {
1058         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1059         dev_t dev = s->s_dev;
1060
1061         dout("kill_sb %p\n", s);
1062
1063         ceph_mdsc_pre_umount(fsc->mdsc);
1064         generic_shutdown_super(s);
1065
1066         fsc->client->extra_mon_dispatch = NULL;
1067         ceph_fs_debugfs_cleanup(fsc);
1068
1069         ceph_fscache_unregister_fs(fsc);
1070
1071         ceph_mdsc_destroy(fsc);
1072
1073         destroy_fs_client(fsc);
1074         free_anon_bdev(dev);
1075 }
1076
1077 static struct file_system_type ceph_fs_type = {
1078         .owner          = THIS_MODULE,
1079         .name           = "ceph",
1080         .mount          = ceph_mount,
1081         .kill_sb        = ceph_kill_sb,
1082         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1083 };
1084 MODULE_ALIAS_FS("ceph");
1085
1086 static int __init init_ceph(void)
1087 {
1088         int ret = init_caches();
1089         if (ret)
1090                 goto out;
1091
1092         ceph_flock_init();
1093         ceph_xattr_init();
1094         ret = register_filesystem(&ceph_fs_type);
1095         if (ret)
1096                 goto out_xattr;
1097
1098         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1099
1100         return 0;
1101
1102 out_xattr:
1103         ceph_xattr_exit();
1104         destroy_caches();
1105 out:
1106         return ret;
1107 }
1108
1109 static void __exit exit_ceph(void)
1110 {
1111         dout("exit_ceph\n");
1112         unregister_filesystem(&ceph_fs_type);
1113         ceph_xattr_exit();
1114         destroy_caches();
1115 }
1116
1117 module_init(init_ceph);
1118 module_exit(exit_ceph);
1119
1120 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1121 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1122 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1123 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1124 MODULE_LICENSE("GPL");