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