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         /* leave fsid little-endian, regardless of host endianness */
  88         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  89         buf->f_fsid.val[0] = fsid & 0xffffffff;
  90         buf->f_fsid.val[1] = fsid >> 32;
  91
  92         return 0;
  93 }
  94
  95
  96 static int ceph_sync_fs(struct super_block *sb, int wait)
  97 {
  98         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
  99
 100         if (!wait) {
 101                 dout("sync_fs (non-blocking)\n");
 102                 ceph_flush_dirty_caps(fsc->mdsc);
 103                 dout("sync_fs (non-blocking) done\n");
 104                 return 0;
 105         }
 106
 107         dout("sync_fs (blocking)\n");
 108         ceph_osdc_sync(&fsc->client->osdc);
 109         ceph_mdsc_sync(fsc->mdsc);
 110         dout("sync_fs (blocking) done\n");
 111         return 0;
 112 }
 113
 114 /*
 115  * mount options
 116  */
 117 enum {
 118         Opt_wsize,
 119         Opt_rsize,
 120         Opt_rasize,
 121         Opt_caps_wanted_delay_min,
 122         Opt_caps_wanted_delay_max,
 123         Opt_readdir_max_entries,
 124         Opt_readdir_max_bytes,
 125         Opt_congestion_kb,
 126         Opt_last_int,
 127         /* int args above */
 128         Opt_snapdirname,
 129         Opt_mds_namespace,
 130         Opt_fscache_uniq,
 131         Opt_last_string,
 132         /* string args above */
 133         Opt_dirstat,
 134         Opt_nodirstat,
 135         Opt_rbytes,
 136         Opt_norbytes,
 137         Opt_asyncreaddir,
 138         Opt_noasyncreaddir,
 139         Opt_dcache,
 140         Opt_nodcache,
 141         Opt_ino32,
 142         Opt_noino32,
 143         Opt_fscache,
 144         Opt_nofscache,
 145         Opt_poolperm,
 146         Opt_nopoolperm,
 147         Opt_require_active_mds,
 148         Opt_norequire_active_mds,
 149 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 150         Opt_acl,
 151 #endif
 152         Opt_noacl,
 153 };
 154
 155 static match_table_t fsopt_tokens = {
 156         {Opt_wsize, "wsize=%d"},
 157         {Opt_rsize, "rsize=%d"},
 158         {Opt_rasize, "rasize=%d"},
 159         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 160         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 161         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 162         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 163         {Opt_congestion_kb, "write_congestion_kb=%d"},
 164         /* int args above */
 165         {Opt_snapdirname, "snapdirname=%s"},
 166         {Opt_mds_namespace, "mds_namespace=%s"},
 167         {Opt_fscache_uniq, "fsc=%s"},
 168         /* string args above */
 169         {Opt_dirstat, "dirstat"},
 170         {Opt_nodirstat, "nodirstat"},
 171         {Opt_rbytes, "rbytes"},
 172         {Opt_norbytes, "norbytes"},
 173         {Opt_asyncreaddir, "asyncreaddir"},
 174         {Opt_noasyncreaddir, "noasyncreaddir"},
 175         {Opt_dcache, "dcache"},
 176         {Opt_nodcache, "nodcache"},
 177         {Opt_ino32, "ino32"},
 178         {Opt_noino32, "noino32"},
 179         {Opt_fscache, "fsc"},
 180         {Opt_nofscache, "nofsc"},
 181         {Opt_poolperm, "poolperm"},
 182         {Opt_nopoolperm, "nopoolperm"},
 183         {Opt_require_active_mds, "require_active_mds"},
 184         {Opt_norequire_active_mds, "norequire_active_mds"},
 185 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 186         {Opt_acl, "acl"},
 187 #endif
 188         {Opt_noacl, "noacl"},
 189         {-1, NULL}
 190 };
 191
 192 static int parse_fsopt_token(char *c, void *private)
 193 {
 194         struct ceph_mount_options *fsopt = private;
 195         substring_t argstr[MAX_OPT_ARGS];
 196         int token, intval, ret;
 197
 198         token = match_token((char *)c, fsopt_tokens, argstr);
 199         if (token < 0)
 200                 return -EINVAL;
 201
 202         if (token < Opt_last_int) {
 203                 ret = match_int(&argstr[0], &intval);
 204                 if (ret < 0) {
 205                         pr_err("bad mount option arg (not int) "
 206                                "at '%s'\n", c);
 207                         return ret;
 208                 }
 209                 dout("got int token %d val %d\n", token, intval);
 210         } else if (token > Opt_last_int && token < Opt_last_string) {
 211                 dout("got string token %d val %s\n", token,
 212                      argstr[0].from);
 213         } else {
 214                 dout("got token %d\n", token);
 215         }
 216
 217         switch (token) {
 218         case Opt_snapdirname:
 219                 kfree(fsopt->snapdir_name);
 220                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 221                                                argstr[0].to-argstr[0].from,
 222                                                GFP_KERNEL);
 223                 if (!fsopt->snapdir_name)
 224                         return -ENOMEM;
 225                 break;
 226         case Opt_mds_namespace:
 227                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 228                                                 argstr[0].to-argstr[0].from,
 229                                                 GFP_KERNEL);
 230                 if (!fsopt->mds_namespace)
 231                         return -ENOMEM;
 232                 break;
 233         case Opt_fscache_uniq:
 234                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 235                                                argstr[0].to-argstr[0].from,
 236                                                GFP_KERNEL);
 237                 if (!fsopt->fscache_uniq)
 238                         return -ENOMEM;
 239                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 240                 break;
 241                 /* misc */
 242         case Opt_wsize:
 243                 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 244                         return -EINVAL;
 245                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 246                 break;
 247         case Opt_rsize:
 248                 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 249                         return -EINVAL;
 250                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 251                 break;
 252         case Opt_rasize:
 253                 if (intval < 0)
 254                         return -EINVAL;
 255                 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE);
 256                 break;
 257         case Opt_caps_wanted_delay_min:
 258                 if (intval < 1)
 259                         return -EINVAL;
 260                 fsopt->caps_wanted_delay_min = intval;
 261                 break;
 262         case Opt_caps_wanted_delay_max:
 263                 if (intval < 1)
 264                         return -EINVAL;
 265                 fsopt->caps_wanted_delay_max = intval;
 266                 break;
 267         case Opt_readdir_max_entries:
 268                 if (intval < 1)
 269                         return -EINVAL;
 270                 fsopt->max_readdir = intval;
 271                 break;
 272         case Opt_readdir_max_bytes:
 273                 if (intval < PAGE_SIZE && intval != 0)
 274                         return -EINVAL;
 275                 fsopt->max_readdir_bytes = intval;
 276                 break;
 277         case Opt_congestion_kb:
 278                 if (intval < 1024) /* at least 1M */
 279                         return -EINVAL;
 280                 fsopt->congestion_kb = intval;
 281                 break;
 282         case Opt_dirstat:
 283                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 284                 break;
 285         case Opt_nodirstat:
 286                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 287                 break;
 288         case Opt_rbytes:
 289                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 290                 break;
 291         case Opt_norbytes:
 292                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 293                 break;
 294         case Opt_asyncreaddir:
 295                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 296                 break;
 297         case Opt_noasyncreaddir:
 298                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 299                 break;
 300         case Opt_dcache:
 301                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 302                 break;
 303         case Opt_nodcache:
 304                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 305                 break;
 306         case Opt_ino32:
 307                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 308                 break;
 309         case Opt_noino32:
 310                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 311                 break;
 312         case Opt_fscache:
 313                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 314                 break;
 315         case Opt_nofscache:
 316                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 317                 break;
 318         case Opt_poolperm:
 319                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 320                 printk ("pool perm");
 321                 break;
 322         case Opt_nopoolperm:
 323                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 324                 break;
 325         case Opt_require_active_mds:
 326                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 327                 break;
 328         case Opt_norequire_active_mds:
 329                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 330                 break;
 331 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 332         case Opt_acl:
 333                 fsopt->sb_flags |= MS_POSIXACL;
 334                 break;
 335 #endif
 336         case Opt_noacl:
 337                 fsopt->sb_flags &= ~MS_POSIXACL;
 338                 break;
 339         default:
 340                 BUG_ON(token);
 341         }
 342         return 0;
 343 }
 344
 345 static void destroy_mount_options(struct ceph_mount_options *args)
 346 {
 347         dout("destroy_mount_options %p\n", args);
 348         kfree(args->snapdir_name);
 349         kfree(args->mds_namespace);
 350         kfree(args->server_path);
 351         kfree(args->fscache_uniq);
 352         kfree(args);
 353 }
 354
 355 static int strcmp_null(const char *s1, const char *s2)
 356 {
 357         if (!s1 && !s2)
 358                 return 0;
 359         if (s1 && !s2)
 360                 return -1;
 361         if (!s1 && s2)
 362                 return 1;
 363         return strcmp(s1, s2);
 364 }
 365
 366 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 367                                  struct ceph_options *new_opt,
 368                                  struct ceph_fs_client *fsc)
 369 {
 370         struct ceph_mount_options *fsopt1 = new_fsopt;
 371         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 372         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 373         int ret;
 374
 375         ret = memcmp(fsopt1, fsopt2, ofs);
 376         if (ret)
 377                 return ret;
 378
 379         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 380         if (ret)
 381                 return ret;
 382         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 383         if (ret)
 384                 return ret;
 385         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 386         if (ret)
 387                 return ret;
 388         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 389         if (ret)
 390                 return ret;
 391
 392         return ceph_compare_options(new_opt, fsc->client);
 393 }
 394
 395 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 396                                struct ceph_options **popt,
 397                                int flags, char *options,
 398                                const char *dev_name)
 399 {
 400         struct ceph_mount_options *fsopt;
 401         const char *dev_name_end;
 402         int err;
 403
 404         if (!dev_name || !*dev_name)
 405                 return -EINVAL;
 406
 407         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 408         if (!fsopt)
 409                 return -ENOMEM;
 410
 411         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 412
 413         fsopt->sb_flags = flags;
 414         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 415
 416         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 417         fsopt->rsize = CEPH_MAX_READ_SIZE;
 418         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 419         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 420         if (!fsopt->snapdir_name) {
 421                 err = -ENOMEM;
 422                 goto out;
 423         }
 424
 425         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 426         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 427         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 428         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 429         fsopt->congestion_kb = default_congestion_kb();
 430
 431         /*
 432          * Distinguish the server list from the path in "dev_name".
 433          * Internally we do not include the leading '/' in the path.
 434          *
 435          * "dev_name" will look like:
 436          *     <server_spec>[,<server_spec>...]:[<path>]
 437          * where
 438          *     <server_spec> is <ip>[:<port>]
 439          *     <path> is optional, but if present must begin with '/'
 440          */
 441         dev_name_end = strchr(dev_name, '/');
 442         if (dev_name_end) {
 443                 if (strlen(dev_name_end) > 1) {
 444                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 445                         if (!fsopt->server_path) {
 446                                 err = -ENOMEM;
 447                                 goto out;
 448                         }
 449                 }
 450         } else {
 451                 dev_name_end = dev_name + strlen(dev_name);
 452         }
 453         err = -EINVAL;
 454         dev_name_end--;         /* back up to ':' separator */
 455         if (dev_name_end < dev_name || *dev_name_end != ':') {
 456                 pr_err("device name is missing path (no : separator in %s)\n",
 457                                 dev_name);
 458                 goto out;
 459         }
 460         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 461         if (fsopt->server_path)
 462                 dout("server path '%s'\n", fsopt->server_path);
 463
 464         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 465                                  parse_fsopt_token, (void *)fsopt);
 466         if (IS_ERR(*popt)) {
 467                 err = PTR_ERR(*popt);
 468                 goto out;
 469         }
 470
 471         /* success */
 472         *pfsopt = fsopt;
 473         return 0;
 474
 475 out:
 476         destroy_mount_options(fsopt);
 477         return err;
 478 }
 479
 480 /**
 481  * ceph_show_options - Show mount options in /proc/mounts
 482  * @m: seq_file to write to
 483  * @root: root of that (sub)tree
 484  */
 485 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 486 {
 487         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 488         struct ceph_mount_options *fsopt = fsc->mount_options;
 489         size_t pos;
 490         int ret;
 491
 492         /* a comma between MNT/MS and client options */
 493         seq_putc(m, ',');
 494         pos = m->count;
 495
 496         ret = ceph_print_client_options(m, fsc->client);
 497         if (ret)
 498                 return ret;
 499
 500         /* retract our comma if no client options */
 501         if (m->count == pos)
 502                 m->count--;
 503
 504         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 505                 seq_puts(m, ",dirstat");
 506         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 507                 seq_puts(m, ",rbytes");
 508         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 509                 seq_puts(m, ",noasyncreaddir");
 510         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 511                 seq_puts(m, ",nodcache");
 512         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 513                 if (fsopt->fscache_uniq)
 514                         seq_printf(m, ",fsc=%s", fsopt->fscache_uniq);
 515                 else
 516                         seq_puts(m, ",fsc");
 517         }
 518         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 519                 seq_puts(m, ",nopoolperm");
 520
 521 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 522         if (fsopt->sb_flags & MS_POSIXACL)
 523                 seq_puts(m, ",acl");
 524         else
 525                 seq_puts(m, ",noacl");
 526 #endif
 527
 528         if (fsopt->mds_namespace)
 529                 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
 530         if (fsopt->wsize)
 531                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 532         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 533                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 534         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 535                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 536         if (fsopt->congestion_kb != default_congestion_kb())
 537                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 538         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 539                 seq_printf(m, ",caps_wanted_delay_min=%d",
 540                          fsopt->caps_wanted_delay_min);
 541         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 542                 seq_printf(m, ",caps_wanted_delay_max=%d",
 543                            fsopt->caps_wanted_delay_max);
 544         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 545                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 546         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 547                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 548         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 549                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 550
 551         return 0;
 552 }
 553
 554 /*
 555  * handle any mon messages the standard library doesn't understand.
 556  * return error if we don't either.
 557  */
 558 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 559 {
 560         struct ceph_fs_client *fsc = client->private;
 561         int type = le16_to_cpu(msg->hdr.type);
 562
 563         switch (type) {
 564         case CEPH_MSG_MDS_MAP:
 565                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 566                 return 0;
 567         case CEPH_MSG_FS_MAP_USER:
 568                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 569                 return 0;
 570         default:
 571                 return -1;
 572         }
 573 }
 574
 575 /*
 576  * create a new fs client
 577  */
 578 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 579                                         struct ceph_options *opt)
 580 {
 581         struct ceph_fs_client *fsc;
 582         int page_count;
 583         size_t size;
 584         int err = -ENOMEM;
 585
 586         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 587         if (!fsc)
 588                 return ERR_PTR(-ENOMEM);
 589
 590         fsc->client = ceph_create_client(opt, fsc);
 591         if (IS_ERR(fsc->client)) {
 592                 err = PTR_ERR(fsc->client);
 593                 goto fail;
 594         }
 595         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 596
 597         if (fsopt->mds_namespace == NULL) {
 598                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 599                                    0, true);
 600         } else {
 601                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 602                                    0, false);
 603         }
 604
 605         fsc->mount_options = fsopt;
 606
 607         fsc->sb = NULL;
 608         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 609
 610         atomic_long_set(&fsc->writeback_count, 0);
 611
 612         err = -ENOMEM;
 613         /*
 614          * The number of concurrent works can be high but they don't need
 615          * to be processed in parallel, limit concurrency.
 616          */
 617         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 618         if (fsc->wb_wq == NULL)
 619                 goto fail_client;
 620         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 621         if (fsc->pg_inv_wq == NULL)
 622                 goto fail_wb_wq;
 623         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 624         if (fsc->trunc_wq == NULL)
 625                 goto fail_pg_inv_wq;
 626
 627         /* set up mempools */
 628         err = -ENOMEM;
 629         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 630         size = sizeof (struct page *) * (page_count ? page_count : 1);
 631         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 632         if (!fsc->wb_pagevec_pool)
 633                 goto fail_trunc_wq;
 634
 635         /* caps */
 636         fsc->min_caps = fsopt->max_readdir;
 637
 638         return fsc;
 639
 640 fail_trunc_wq:
 641         destroy_workqueue(fsc->trunc_wq);
 642 fail_pg_inv_wq:
 643         destroy_workqueue(fsc->pg_inv_wq);
 644 fail_wb_wq:
 645         destroy_workqueue(fsc->wb_wq);
 646 fail_client:
 647         ceph_destroy_client(fsc->client);
 648 fail:
 649         kfree(fsc);
 650         return ERR_PTR(err);
 651 }
 652
 653 static void destroy_fs_client(struct ceph_fs_client *fsc)
 654 {
 655         dout("destroy_fs_client %p\n", fsc);
 656
 657         destroy_workqueue(fsc->wb_wq);
 658         destroy_workqueue(fsc->pg_inv_wq);
 659         destroy_workqueue(fsc->trunc_wq);
 660
 661         mempool_destroy(fsc->wb_pagevec_pool);
 662
 663         destroy_mount_options(fsc->mount_options);
 664
 665         ceph_destroy_client(fsc->client);
 666
 667         kfree(fsc);
 668         dout("destroy_fs_client %p done\n", fsc);
 669 }
 670
 671 /*
 672  * caches
 673  */
 674 struct kmem_cache *ceph_inode_cachep;
 675 struct kmem_cache *ceph_cap_cachep;
 676 struct kmem_cache *ceph_cap_flush_cachep;
 677 struct kmem_cache *ceph_dentry_cachep;
 678 struct kmem_cache *ceph_file_cachep;
 679
 680 static void ceph_inode_init_once(void *foo)
 681 {
 682         struct ceph_inode_info *ci = foo;
 683         inode_init_once(&ci->vfs_inode);
 684 }
 685
 686 static int __init init_caches(void)
 687 {
 688         int error = -ENOMEM;
 689
 690         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 691                                       sizeof(struct ceph_inode_info),
 692                                       __alignof__(struct ceph_inode_info),
 693                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 694                                       SLAB_ACCOUNT, ceph_inode_init_once);
 695         if (ceph_inode_cachep == NULL)
 696                 return -ENOMEM;
 697
 698         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 699                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 700         if (ceph_cap_cachep == NULL)
 701                 goto bad_cap;
 702         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 703                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 704         if (ceph_cap_flush_cachep == NULL)
 705                 goto bad_cap_flush;
 706
 707         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 708                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 709         if (ceph_dentry_cachep == NULL)
 710                 goto bad_dentry;
 711
 712         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 713
 714         if (ceph_file_cachep == NULL)
 715                 goto bad_file;
 716
 717         if ((error = ceph_fscache_register()))
 718                 goto bad_file;
 719
 720         return 0;
 721 bad_file:
 722         kmem_cache_destroy(ceph_dentry_cachep);
 723 bad_dentry:
 724         kmem_cache_destroy(ceph_cap_flush_cachep);
 725 bad_cap_flush:
 726         kmem_cache_destroy(ceph_cap_cachep);
 727 bad_cap:
 728         kmem_cache_destroy(ceph_inode_cachep);
 729         return error;
 730 }
 731
 732 static void destroy_caches(void)
 733 {
 734         /*
 735          * Make sure all delayed rcu free inodes are flushed before we
 736          * destroy cache.
 737          */
 738         rcu_barrier();
 739
 740         kmem_cache_destroy(ceph_inode_cachep);
 741         kmem_cache_destroy(ceph_cap_cachep);
 742         kmem_cache_destroy(ceph_cap_flush_cachep);
 743         kmem_cache_destroy(ceph_dentry_cachep);
 744         kmem_cache_destroy(ceph_file_cachep);
 745
 746         ceph_fscache_unregister();
 747 }
 748
 749
 750 /*
 751  * ceph_umount_begin - initiate forced umount.  Tear down down the
 752  * mount, skipping steps that may hang while waiting for server(s).
 753  */
 754 static void ceph_umount_begin(struct super_block *sb)
 755 {
 756         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 757
 758         dout("ceph_umount_begin - starting forced umount\n");
 759         if (!fsc)
 760                 return;
 761         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 762         ceph_mdsc_force_umount(fsc->mdsc);
 763         return;
 764 }
 765
 766 static const struct super_operations ceph_super_ops = {
 767         .alloc_inode    = ceph_alloc_inode,
 768         .destroy_inode  = ceph_destroy_inode,
 769         .write_inode    = ceph_write_inode,
 770         .drop_inode     = ceph_drop_inode,
 771         .sync_fs        = ceph_sync_fs,
 772         .put_super      = ceph_put_super,
 773         .show_options   = ceph_show_options,
 774         .statfs         = ceph_statfs,
 775         .umount_begin   = ceph_umount_begin,
 776 };
 777
 778 /*
 779  * Bootstrap mount by opening the root directory.  Note the mount
 780  * @started time from caller, and time out if this takes too long.
 781  */
 782 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 783                                        const char *path,
 784                                        unsigned long started)
 785 {
 786         struct ceph_mds_client *mdsc = fsc->mdsc;
 787         struct ceph_mds_request *req = NULL;
 788         int err;
 789         struct dentry *root;
 790
 791         /* open dir */
 792         dout("open_root_inode opening '%s'\n", path);
 793         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 794         if (IS_ERR(req))
 795                 return ERR_CAST(req);
 796         req->r_path1 = kstrdup(path, GFP_NOFS);
 797         if (!req->r_path1) {
 798                 root = ERR_PTR(-ENOMEM);
 799                 goto out;
 800         }
 801
 802         req->r_ino1.ino = CEPH_INO_ROOT;
 803         req->r_ino1.snap = CEPH_NOSNAP;
 804         req->r_started = started;
 805         req->r_timeout = fsc->client->options->mount_timeout;
 806         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 807         req->r_num_caps = 2;
 808         err = ceph_mdsc_do_request(mdsc, NULL, req);
 809         if (err == 0) {
 810                 struct inode *inode = req->r_target_inode;
 811                 req->r_target_inode = NULL;
 812                 dout("open_root_inode success\n");
 813                 root = d_make_root(inode);
 814                 if (!root) {
 815                         root = ERR_PTR(-ENOMEM);
 816                         goto out;
 817                 }
 818                 dout("open_root_inode success, root dentry is %p\n", root);
 819         } else {
 820                 root = ERR_PTR(err);
 821         }
 822 out:
 823         ceph_mdsc_put_request(req);
 824         return root;
 825 }
 826
 827
 828
 829
 830 /*
 831  * mount: join the ceph cluster, and open root directory.
 832  */
 833 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 834 {
 835         int err;
 836         unsigned long started = jiffies;  /* note the start time */
 837         struct dentry *root;
 838         int first = 0;   /* first vfsmount for this super_block */
 839
 840         dout("mount start %p\n", fsc);
 841         mutex_lock(&fsc->client->mount_mutex);
 842
 843         if (!fsc->sb->s_root) {
 844                 const char *path;
 845                 err = __ceph_open_session(fsc->client, started);
 846                 if (err < 0)
 847                         goto out;
 848
 849                 /* setup fscache */
 850                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 851                         err = ceph_fscache_register_fs(fsc);
 852                         if (err < 0)
 853                                 goto out;
 854                 }
 855
 856                 if (!fsc->mount_options->server_path) {
 857                         path = "";
 858                         dout("mount opening path \\t\n");
 859                 } else {
 860                         path = fsc->mount_options->server_path + 1;
 861                         dout("mount opening path %s\n", path);
 862                 }
 863                 root = open_root_dentry(fsc, path, started);
 864                 if (IS_ERR(root)) {
 865                         err = PTR_ERR(root);
 866                         goto out;
 867                 }
 868                 fsc->sb->s_root = dget(root);
 869                 first = 1;
 870
 871                 err = ceph_fs_debugfs_init(fsc);
 872                 if (err < 0)
 873                         goto fail;
 874         } else {
 875                 root = dget(fsc->sb->s_root);
 876         }
 877
 878         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 879         dout("mount success\n");
 880         mutex_unlock(&fsc->client->mount_mutex);
 881         return root;
 882
 883 fail:
 884         if (first) {
 885                 dput(fsc->sb->s_root);
 886                 fsc->sb->s_root = NULL;
 887         }
 888 out:
 889         mutex_unlock(&fsc->client->mount_mutex);
 890         return ERR_PTR(err);
 891 }
 892
 893 static int ceph_set_super(struct super_block *s, void *data)
 894 {
 895         struct ceph_fs_client *fsc = data;
 896         int ret;
 897
 898         dout("set_super %p data %p\n", s, data);
 899
 900         s->s_flags = fsc->mount_options->sb_flags;
 901         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 902
 903         s->s_xattr = ceph_xattr_handlers;
 904         s->s_fs_info = fsc;
 905         fsc->sb = s;
 906
 907         s->s_op = &ceph_super_ops;
 908         s->s_d_op = &ceph_dentry_ops;
 909         s->s_export_op = &ceph_export_ops;
 910
 911         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 912
 913         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 914         if (ret != 0)
 915                 goto fail;
 916
 917         return ret;
 918
 919 fail:
 920         s->s_fs_info = NULL;
 921         fsc->sb = NULL;
 922         return ret;
 923 }
 924
 925 /*
 926  * share superblock if same fs AND options
 927  */
 928 static int ceph_compare_super(struct super_block *sb, void *data)
 929 {
 930         struct ceph_fs_client *new = data;
 931         struct ceph_mount_options *fsopt = new->mount_options;
 932         struct ceph_options *opt = new->client->options;
 933         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 934
 935         dout("ceph_compare_super %p\n", sb);
 936
 937         if (compare_mount_options(fsopt, opt, other)) {
 938                 dout("monitor(s)/mount options don't match\n");
 939                 return 0;
 940         }
 941         if ((opt->flags & CEPH_OPT_FSID) &&
 942             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 943                 dout("fsid doesn't match\n");
 944                 return 0;
 945         }
 946         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 947                 dout("flags differ\n");
 948                 return 0;
 949         }
 950         return 1;
 951 }
 952
 953 /*
 954  * construct our own bdi so we can control readahead, etc.
 955  */
 956 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 957
 958 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
 959 {
 960         int err;
 961
 962         err = super_setup_bdi_name(sb, "ceph-%ld",
 963                                    atomic_long_inc_return(&bdi_seq));
 964         if (err)
 965                 return err;
 966
 967         /* set ra_pages based on rasize mount option? */
 968         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
 969
 970         /* set io_pages based on max osd read size */
 971         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
 972
 973         return 0;
 974 }
 975
 976 static struct dentry *ceph_mount(struct file_system_type *fs_type,
 977                        int flags, const char *dev_name, void *data)
 978 {
 979         struct super_block *sb;
 980         struct ceph_fs_client *fsc;
 981         struct dentry *res;
 982         int err;
 983         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 984         struct ceph_mount_options *fsopt = NULL;
 985         struct ceph_options *opt = NULL;
 986
 987         dout("ceph_mount\n");
 988
 989 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 990         flags |= MS_POSIXACL;
 991 #endif
 992         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
 993         if (err < 0) {
 994                 res = ERR_PTR(err);
 995                 goto out_final;
 996         }
 997
 998         /* create client (which we may/may not use) */
 999         fsc = create_fs_client(fsopt, opt);
1000         if (IS_ERR(fsc)) {
1001                 res = ERR_CAST(fsc);
1002                 destroy_mount_options(fsopt);
1003                 ceph_destroy_options(opt);
1004                 goto out_final;
1005         }
1006
1007         err = ceph_mdsc_init(fsc);
1008         if (err < 0) {
1009                 res = ERR_PTR(err);
1010                 goto out;
1011         }
1012
1013         if (ceph_test_opt(fsc->client, NOSHARE))
1014                 compare_super = NULL;
1015         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1016         if (IS_ERR(sb)) {
1017                 res = ERR_CAST(sb);
1018                 goto out;
1019         }
1020
1021         if (ceph_sb_to_client(sb) != fsc) {
1022                 ceph_mdsc_destroy(fsc);
1023                 destroy_fs_client(fsc);
1024                 fsc = ceph_sb_to_client(sb);
1025                 dout("get_sb got existing client %p\n", fsc);
1026         } else {
1027                 dout("get_sb using new client %p\n", fsc);
1028                 err = ceph_setup_bdi(sb, fsc);
1029                 if (err < 0) {
1030                         res = ERR_PTR(err);
1031                         goto out_splat;
1032                 }
1033         }
1034
1035         res = ceph_real_mount(fsc);
1036         if (IS_ERR(res))
1037                 goto out_splat;
1038         dout("root %p inode %p ino %llx.%llx\n", res,
1039              d_inode(res), ceph_vinop(d_inode(res)));
1040         return res;
1041
1042 out_splat:
1043         ceph_mdsc_close_sessions(fsc->mdsc);
1044         deactivate_locked_super(sb);
1045         goto out_final;
1046
1047 out:
1048         ceph_mdsc_destroy(fsc);
1049         destroy_fs_client(fsc);
1050 out_final:
1051         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1052         return res;
1053 }
1054
1055 static void ceph_kill_sb(struct super_block *s)
1056 {
1057         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1058         dev_t dev = s->s_dev;
1059
1060         dout("kill_sb %p\n", s);
1061
1062         ceph_mdsc_pre_umount(fsc->mdsc);
1063         generic_shutdown_super(s);
1064
1065         fsc->client->extra_mon_dispatch = NULL;
1066         ceph_fs_debugfs_cleanup(fsc);
1067
1068         ceph_fscache_unregister_fs(fsc);
1069
1070         ceph_mdsc_destroy(fsc);
1071
1072         destroy_fs_client(fsc);
1073         free_anon_bdev(dev);
1074 }
1075
1076 static struct file_system_type ceph_fs_type = {
1077         .owner          = THIS_MODULE,
1078         .name           = "ceph",
1079         .mount          = ceph_mount,
1080         .kill_sb        = ceph_kill_sb,
1081         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1082 };
1083 MODULE_ALIAS_FS("ceph");
1084
1085 static int __init init_ceph(void)
1086 {
1087         int ret = init_caches();
1088         if (ret)
1089                 goto out;
1090
1091         ceph_flock_init();
1092         ceph_xattr_init();
1093         ret = register_filesystem(&ceph_fs_type);
1094         if (ret)
1095                 goto out_xattr;
1096
1097         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1098
1099         return 0;
1100
1101 out_xattr:
1102         ceph_xattr_exit();
1103         destroy_caches();
1104 out:
1105         return ret;
1106 }
1107
1108 static void __exit exit_ceph(void)
1109 {
1110         dout("exit_ceph\n");
1111         unregister_filesystem(&ceph_fs_type);
1112         ceph_xattr_exit();
1113         destroy_caches();
1114 }
1115
1116 module_init(init_ceph);
1117 module_exit(exit_ceph);
1118
1119 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1120 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1121 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1122 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1123 MODULE_LICENSE("GPL");