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_mon_client *monc = &fsc->client->monc;
  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(monc, data_pool, &st);
  62         if (err < 0)
  63                 return err;
  64
  65         /* fill in kstatfs */
  66         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  67
  68         /*
  69          * express utilization in terms of large blocks to avoid
  70          * overflow on 32-bit machines.
  71          *
  72          * NOTE: for the time being, we make bsize == frsize to humor
  73          * not-yet-ancient versions of glibc that are broken.
  74          * Someday, we will probably want to report a real block
  75          * size...  whatever that may mean for a network file system!
  76          */
  77         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  78         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  79
  80         /*
  81          * By default use root quota for stats; fallback to overall filesystem
  82          * usage if using 'noquotadf' mount option or if the root dir doesn't
  83          * have max_bytes quota set.
  84          */
  85         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  86             !ceph_quota_update_statfs(fsc, buf)) {
  87                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  88                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  89                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  90         }
  91
  92         buf->f_files = le64_to_cpu(st.num_objects);
  93         buf->f_ffree = -1;
  94         buf->f_namelen = NAME_MAX;
  95
  96         /* Must convert the fsid, for consistent values across arches */
  97         mutex_lock(&monc->mutex);
  98         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
  99                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 100         mutex_unlock(&monc->mutex);
 101
 102         buf->f_fsid.val[0] = fsid & 0xffffffff;
 103         buf->f_fsid.val[1] = fsid >> 32;
 104
 105         return 0;
 106 }
 107
 108
 109 static int ceph_sync_fs(struct super_block *sb, int wait)
 110 {
 111         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 112
 113         if (!wait) {
 114                 dout("sync_fs (non-blocking)\n");
 115                 ceph_flush_dirty_caps(fsc->mdsc);
 116                 dout("sync_fs (non-blocking) done\n");
 117                 return 0;
 118         }
 119
 120         dout("sync_fs (blocking)\n");
 121         ceph_osdc_sync(&fsc->client->osdc);
 122         ceph_mdsc_sync(fsc->mdsc);
 123         dout("sync_fs (blocking) done\n");
 124         return 0;
 125 }
 126
 127 /*
 128  * mount options
 129  */
 130 enum {
 131         Opt_wsize,
 132         Opt_rsize,
 133         Opt_rasize,
 134         Opt_caps_wanted_delay_min,
 135         Opt_caps_wanted_delay_max,
 136         Opt_caps_max,
 137         Opt_readdir_max_entries,
 138         Opt_readdir_max_bytes,
 139         Opt_congestion_kb,
 140         Opt_last_int,
 141         /* int args above */
 142         Opt_snapdirname,
 143         Opt_mds_namespace,
 144         Opt_fscache_uniq,
 145         Opt_last_string,
 146         /* string args above */
 147         Opt_dirstat,
 148         Opt_nodirstat,
 149         Opt_rbytes,
 150         Opt_norbytes,
 151         Opt_asyncreaddir,
 152         Opt_noasyncreaddir,
 153         Opt_dcache,
 154         Opt_nodcache,
 155         Opt_ino32,
 156         Opt_noino32,
 157         Opt_fscache,
 158         Opt_nofscache,
 159         Opt_poolperm,
 160         Opt_nopoolperm,
 161         Opt_require_active_mds,
 162         Opt_norequire_active_mds,
 163 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 164         Opt_acl,
 165 #endif
 166         Opt_noacl,
 167         Opt_quotadf,
 168         Opt_noquotadf,
 169         Opt_copyfrom,
 170         Opt_nocopyfrom,
 171 };
 172
 173 static match_table_t fsopt_tokens = {
 174         {Opt_wsize, "wsize=%d"},
 175         {Opt_rsize, "rsize=%d"},
 176         {Opt_rasize, "rasize=%d"},
 177         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 178         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 179         {Opt_caps_max, "caps_max=%d"},
 180         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 181         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 182         {Opt_congestion_kb, "write_congestion_kb=%d"},
 183         /* int args above */
 184         {Opt_snapdirname, "snapdirname=%s"},
 185         {Opt_mds_namespace, "mds_namespace=%s"},
 186         {Opt_fscache_uniq, "fsc=%s"},
 187         /* string args above */
 188         {Opt_dirstat, "dirstat"},
 189         {Opt_nodirstat, "nodirstat"},
 190         {Opt_rbytes, "rbytes"},
 191         {Opt_norbytes, "norbytes"},
 192         {Opt_asyncreaddir, "asyncreaddir"},
 193         {Opt_noasyncreaddir, "noasyncreaddir"},
 194         {Opt_dcache, "dcache"},
 195         {Opt_nodcache, "nodcache"},
 196         {Opt_ino32, "ino32"},
 197         {Opt_noino32, "noino32"},
 198         {Opt_fscache, "fsc"},
 199         {Opt_nofscache, "nofsc"},
 200         {Opt_poolperm, "poolperm"},
 201         {Opt_nopoolperm, "nopoolperm"},
 202         {Opt_require_active_mds, "require_active_mds"},
 203         {Opt_norequire_active_mds, "norequire_active_mds"},
 204 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 205         {Opt_acl, "acl"},
 206 #endif
 207         {Opt_noacl, "noacl"},
 208         {Opt_quotadf, "quotadf"},
 209         {Opt_noquotadf, "noquotadf"},
 210         {Opt_copyfrom, "copyfrom"},
 211         {Opt_nocopyfrom, "nocopyfrom"},
 212         {-1, NULL}
 213 };
 214
 215 static int parse_fsopt_token(char *c, void *private)
 216 {
 217         struct ceph_mount_options *fsopt = private;
 218         substring_t argstr[MAX_OPT_ARGS];
 219         int token, intval, ret;
 220
 221         token = match_token((char *)c, fsopt_tokens, argstr);
 222         if (token < 0)
 223                 return -EINVAL;
 224
 225         if (token < Opt_last_int) {
 226                 ret = match_int(&argstr[0], &intval);
 227                 if (ret < 0) {
 228                         pr_err("bad option arg (not int) at '%s'\n", c);
 229                         return ret;
 230                 }
 231                 dout("got int token %d val %d\n", token, intval);
 232         } else if (token > Opt_last_int && token < Opt_last_string) {
 233                 dout("got string token %d val %s\n", token,
 234                      argstr[0].from);
 235         } else {
 236                 dout("got token %d\n", token);
 237         }
 238
 239         switch (token) {
 240         case Opt_snapdirname:
 241                 kfree(fsopt->snapdir_name);
 242                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 243                                                argstr[0].to-argstr[0].from,
 244                                                GFP_KERNEL);
 245                 if (!fsopt->snapdir_name)
 246                         return -ENOMEM;
 247                 break;
 248         case Opt_mds_namespace:
 249                 kfree(fsopt->mds_namespace);
 250                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 251                                                 argstr[0].to-argstr[0].from,
 252                                                 GFP_KERNEL);
 253                 if (!fsopt->mds_namespace)
 254                         return -ENOMEM;
 255                 break;
 256         case Opt_fscache_uniq:
 257                 kfree(fsopt->fscache_uniq);
 258                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 259                                                argstr[0].to-argstr[0].from,
 260                                                GFP_KERNEL);
 261                 if (!fsopt->fscache_uniq)
 262                         return -ENOMEM;
 263                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 264                 break;
 265                 /* misc */
 266         case Opt_wsize:
 267                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 268                         return -EINVAL;
 269                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 270                 break;
 271         case Opt_rsize:
 272                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 273                         return -EINVAL;
 274                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 275                 break;
 276         case Opt_rasize:
 277                 if (intval < 0)
 278                         return -EINVAL;
 279                 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
 280                 break;
 281         case Opt_caps_wanted_delay_min:
 282                 if (intval < 1)
 283                         return -EINVAL;
 284                 fsopt->caps_wanted_delay_min = intval;
 285                 break;
 286         case Opt_caps_wanted_delay_max:
 287                 if (intval < 1)
 288                         return -EINVAL;
 289                 fsopt->caps_wanted_delay_max = intval;
 290                 break;
 291         case Opt_caps_max:
 292                 if (intval < 0)
 293                         return -EINVAL;
 294                 fsopt->caps_max = intval;
 295                 break;
 296         case Opt_readdir_max_entries:
 297                 if (intval < 1)
 298                         return -EINVAL;
 299                 fsopt->max_readdir = intval;
 300                 break;
 301         case Opt_readdir_max_bytes:
 302                 if (intval < (int)PAGE_SIZE && intval != 0)
 303                         return -EINVAL;
 304                 fsopt->max_readdir_bytes = intval;
 305                 break;
 306         case Opt_congestion_kb:
 307                 if (intval < 1024) /* at least 1M */
 308                         return -EINVAL;
 309                 fsopt->congestion_kb = intval;
 310                 break;
 311         case Opt_dirstat:
 312                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 313                 break;
 314         case Opt_nodirstat:
 315                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 316                 break;
 317         case Opt_rbytes:
 318                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 319                 break;
 320         case Opt_norbytes:
 321                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 322                 break;
 323         case Opt_asyncreaddir:
 324                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 325                 break;
 326         case Opt_noasyncreaddir:
 327                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 328                 break;
 329         case Opt_dcache:
 330                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 331                 break;
 332         case Opt_nodcache:
 333                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 334                 break;
 335         case Opt_ino32:
 336                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 337                 break;
 338         case Opt_noino32:
 339                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 340                 break;
 341         case Opt_fscache:
 342                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 343                 kfree(fsopt->fscache_uniq);
 344                 fsopt->fscache_uniq = NULL;
 345                 break;
 346         case Opt_nofscache:
 347                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 348                 kfree(fsopt->fscache_uniq);
 349                 fsopt->fscache_uniq = NULL;
 350                 break;
 351         case Opt_poolperm:
 352                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 353                 break;
 354         case Opt_nopoolperm:
 355                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 356                 break;
 357         case Opt_require_active_mds:
 358                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 359                 break;
 360         case Opt_norequire_active_mds:
 361                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 362                 break;
 363         case Opt_quotadf:
 364                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 365                 break;
 366         case Opt_noquotadf:
 367                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 368                 break;
 369         case Opt_copyfrom:
 370                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 371                 break;
 372         case Opt_nocopyfrom:
 373                 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 374                 break;
 375 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 376         case Opt_acl:
 377                 fsopt->sb_flags |= SB_POSIXACL;
 378                 break;
 379 #endif
 380         case Opt_noacl:
 381                 fsopt->sb_flags &= ~SB_POSIXACL;
 382                 break;
 383         default:
 384                 BUG_ON(token);
 385         }
 386         return 0;
 387 }
 388
 389 static void destroy_mount_options(struct ceph_mount_options *args)
 390 {
 391         dout("destroy_mount_options %p\n", args);
 392         kfree(args->snapdir_name);
 393         kfree(args->mds_namespace);
 394         kfree(args->server_path);
 395         kfree(args->fscache_uniq);
 396         kfree(args);
 397 }
 398
 399 static int strcmp_null(const char *s1, const char *s2)
 400 {
 401         if (!s1 && !s2)
 402                 return 0;
 403         if (s1 && !s2)
 404                 return -1;
 405         if (!s1 && s2)
 406                 return 1;
 407         return strcmp(s1, s2);
 408 }
 409
 410 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 411                                  struct ceph_options *new_opt,
 412                                  struct ceph_fs_client *fsc)
 413 {
 414         struct ceph_mount_options *fsopt1 = new_fsopt;
 415         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 416         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 417         int ret;
 418
 419         ret = memcmp(fsopt1, fsopt2, ofs);
 420         if (ret)
 421                 return ret;
 422
 423         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 424         if (ret)
 425                 return ret;
 426         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 427         if (ret)
 428                 return ret;
 429         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 430         if (ret)
 431                 return ret;
 432         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 433         if (ret)
 434                 return ret;
 435
 436         return ceph_compare_options(new_opt, fsc->client);
 437 }
 438
 439 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 440                                struct ceph_options **popt,
 441                                int flags, char *options,
 442                                const char *dev_name)
 443 {
 444         struct ceph_mount_options *fsopt;
 445         const char *dev_name_end;
 446         int err;
 447
 448         if (!dev_name || !*dev_name)
 449                 return -EINVAL;
 450
 451         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 452         if (!fsopt)
 453                 return -ENOMEM;
 454
 455         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 456
 457         fsopt->sb_flags = flags;
 458         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 459
 460         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 461         fsopt->rsize = CEPH_MAX_READ_SIZE;
 462         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 463         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 464         if (!fsopt->snapdir_name) {
 465                 err = -ENOMEM;
 466                 goto out;
 467         }
 468
 469         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 470         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 471         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 472         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 473         fsopt->congestion_kb = default_congestion_kb();
 474
 475         /*
 476          * Distinguish the server list from the path in "dev_name".
 477          * Internally we do not include the leading '/' in the path.
 478          *
 479          * "dev_name" will look like:
 480          *     <server_spec>[,<server_spec>...]:[<path>]
 481          * where
 482          *     <server_spec> is <ip>[:<port>]
 483          *     <path> is optional, but if present must begin with '/'
 484          */
 485         dev_name_end = strchr(dev_name, '/');
 486         if (dev_name_end) {
 487                 if (strlen(dev_name_end) > 1) {
 488                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 489                         if (!fsopt->server_path) {
 490                                 err = -ENOMEM;
 491                                 goto out;
 492                         }
 493                 }
 494         } else {
 495                 dev_name_end = dev_name + strlen(dev_name);
 496         }
 497         err = -EINVAL;
 498         dev_name_end--;         /* back up to ':' separator */
 499         if (dev_name_end < dev_name || *dev_name_end != ':') {
 500                 pr_err("device name is missing path (no : separator in %s)\n",
 501                                 dev_name);
 502                 goto out;
 503         }
 504         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 505         if (fsopt->server_path)
 506                 dout("server path '%s'\n", fsopt->server_path);
 507
 508         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 509                                  parse_fsopt_token, (void *)fsopt);
 510         if (IS_ERR(*popt)) {
 511                 err = PTR_ERR(*popt);
 512                 goto out;
 513         }
 514
 515         /* success */
 516         *pfsopt = fsopt;
 517         return 0;
 518
 519 out:
 520         destroy_mount_options(fsopt);
 521         return err;
 522 }
 523
 524 /**
 525  * ceph_show_options - Show mount options in /proc/mounts
 526  * @m: seq_file to write to
 527  * @root: root of that (sub)tree
 528  */
 529 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 530 {
 531         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 532         struct ceph_mount_options *fsopt = fsc->mount_options;
 533         size_t pos;
 534         int ret;
 535
 536         /* a comma between MNT/MS and client options */
 537         seq_putc(m, ',');
 538         pos = m->count;
 539
 540         ret = ceph_print_client_options(m, fsc->client, false);
 541         if (ret)
 542                 return ret;
 543
 544         /* retract our comma if no client options */
 545         if (m->count == pos)
 546                 m->count--;
 547
 548         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 549                 seq_puts(m, ",dirstat");
 550         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 551                 seq_puts(m, ",rbytes");
 552         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 553                 seq_puts(m, ",noasyncreaddir");
 554         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 555                 seq_puts(m, ",nodcache");
 556         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 557                 seq_puts(m, ",ino32");
 558         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 559                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 560         }
 561         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 562                 seq_puts(m, ",nopoolperm");
 563         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 564                 seq_puts(m, ",noquotadf");
 565
 566 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 567         if (fsopt->sb_flags & SB_POSIXACL)
 568                 seq_puts(m, ",acl");
 569         else
 570                 seq_puts(m, ",noacl");
 571 #endif
 572
 573         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 574                 seq_puts(m, ",copyfrom");
 575
 576         if (fsopt->mds_namespace)
 577                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 578         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 579                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 580         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 581                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 582         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 583                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 584         if (fsopt->congestion_kb != default_congestion_kb())
 585                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 586         if (fsopt->caps_max)
 587                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 588         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 589                 seq_printf(m, ",caps_wanted_delay_min=%d",
 590                          fsopt->caps_wanted_delay_min);
 591         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 592                 seq_printf(m, ",caps_wanted_delay_max=%d",
 593                            fsopt->caps_wanted_delay_max);
 594         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 595                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 596         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 597                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 598         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 599                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 600
 601         return 0;
 602 }
 603
 604 /*
 605  * handle any mon messages the standard library doesn't understand.
 606  * return error if we don't either.
 607  */
 608 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 609 {
 610         struct ceph_fs_client *fsc = client->private;
 611         int type = le16_to_cpu(msg->hdr.type);
 612
 613         switch (type) {
 614         case CEPH_MSG_MDS_MAP:
 615                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 616                 return 0;
 617         case CEPH_MSG_FS_MAP_USER:
 618                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 619                 return 0;
 620         default:
 621                 return -1;
 622         }
 623 }
 624
 625 /*
 626  * create a new fs client
 627  *
 628  * Success or not, this function consumes @fsopt and @opt.
 629  */
 630 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 631                                         struct ceph_options *opt)
 632 {
 633         struct ceph_fs_client *fsc;
 634         int page_count;
 635         size_t size;
 636         int err;
 637
 638         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 639         if (!fsc) {
 640                 err = -ENOMEM;
 641                 goto fail;
 642         }
 643
 644         fsc->client = ceph_create_client(opt, fsc);
 645         if (IS_ERR(fsc->client)) {
 646                 err = PTR_ERR(fsc->client);
 647                 goto fail;
 648         }
 649         opt = NULL; /* fsc->client now owns this */
 650
 651         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 652         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 653
 654         if (!fsopt->mds_namespace) {
 655                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 656                                    0, true);
 657         } else {
 658                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 659                                    0, false);
 660         }
 661
 662         fsc->mount_options = fsopt;
 663
 664         fsc->sb = NULL;
 665         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 666
 667         atomic_long_set(&fsc->writeback_count, 0);
 668
 669         err = -ENOMEM;
 670         /*
 671          * The number of concurrent works can be high but they don't need
 672          * to be processed in parallel, limit concurrency.
 673          */
 674         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 675         if (!fsc->wb_wq)
 676                 goto fail_client;
 677         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 678         if (!fsc->pg_inv_wq)
 679                 goto fail_wb_wq;
 680         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 681         if (!fsc->trunc_wq)
 682                 goto fail_pg_inv_wq;
 683         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 684         if (!fsc->cap_wq)
 685                 goto fail_trunc_wq;
 686
 687         /* set up mempools */
 688         err = -ENOMEM;
 689         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 690         size = sizeof (struct page *) * (page_count ? page_count : 1);
 691         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 692         if (!fsc->wb_pagevec_pool)
 693                 goto fail_cap_wq;
 694
 695         return fsc;
 696
 697 fail_cap_wq:
 698         destroy_workqueue(fsc->cap_wq);
 699 fail_trunc_wq:
 700         destroy_workqueue(fsc->trunc_wq);
 701 fail_pg_inv_wq:
 702         destroy_workqueue(fsc->pg_inv_wq);
 703 fail_wb_wq:
 704         destroy_workqueue(fsc->wb_wq);
 705 fail_client:
 706         ceph_destroy_client(fsc->client);
 707 fail:
 708         kfree(fsc);
 709         if (opt)
 710                 ceph_destroy_options(opt);
 711         destroy_mount_options(fsopt);
 712         return ERR_PTR(err);
 713 }
 714
 715 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 716 {
 717         flush_workqueue(fsc->wb_wq);
 718         flush_workqueue(fsc->pg_inv_wq);
 719         flush_workqueue(fsc->trunc_wq);
 720         flush_workqueue(fsc->cap_wq);
 721 }
 722
 723 static void destroy_fs_client(struct ceph_fs_client *fsc)
 724 {
 725         dout("destroy_fs_client %p\n", fsc);
 726
 727         destroy_workqueue(fsc->wb_wq);
 728         destroy_workqueue(fsc->pg_inv_wq);
 729         destroy_workqueue(fsc->trunc_wq);
 730         destroy_workqueue(fsc->cap_wq);
 731
 732         mempool_destroy(fsc->wb_pagevec_pool);
 733
 734         destroy_mount_options(fsc->mount_options);
 735
 736         ceph_destroy_client(fsc->client);
 737
 738         kfree(fsc);
 739         dout("destroy_fs_client %p done\n", fsc);
 740 }
 741
 742 /*
 743  * caches
 744  */
 745 struct kmem_cache *ceph_inode_cachep;
 746 struct kmem_cache *ceph_cap_cachep;
 747 struct kmem_cache *ceph_cap_flush_cachep;
 748 struct kmem_cache *ceph_dentry_cachep;
 749 struct kmem_cache *ceph_file_cachep;
 750 struct kmem_cache *ceph_dir_file_cachep;
 751
 752 static void ceph_inode_init_once(void *foo)
 753 {
 754         struct ceph_inode_info *ci = foo;
 755         inode_init_once(&ci->vfs_inode);
 756 }
 757
 758 static int __init init_caches(void)
 759 {
 760         int error = -ENOMEM;
 761
 762         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 763                                       sizeof(struct ceph_inode_info),
 764                                       __alignof__(struct ceph_inode_info),
 765                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 766                                       SLAB_ACCOUNT, ceph_inode_init_once);
 767         if (!ceph_inode_cachep)
 768                 return -ENOMEM;
 769
 770         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 771         if (!ceph_cap_cachep)
 772                 goto bad_cap;
 773         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 774                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 775         if (!ceph_cap_flush_cachep)
 776                 goto bad_cap_flush;
 777
 778         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 779                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 780         if (!ceph_dentry_cachep)
 781                 goto bad_dentry;
 782
 783         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 784         if (!ceph_file_cachep)
 785                 goto bad_file;
 786
 787         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 788         if (!ceph_dir_file_cachep)
 789                 goto bad_dir_file;
 790
 791         error = ceph_fscache_register();
 792         if (error)
 793                 goto bad_fscache;
 794
 795         return 0;
 796
 797 bad_fscache:
 798         kmem_cache_destroy(ceph_dir_file_cachep);
 799 bad_dir_file:
 800         kmem_cache_destroy(ceph_file_cachep);
 801 bad_file:
 802         kmem_cache_destroy(ceph_dentry_cachep);
 803 bad_dentry:
 804         kmem_cache_destroy(ceph_cap_flush_cachep);
 805 bad_cap_flush:
 806         kmem_cache_destroy(ceph_cap_cachep);
 807 bad_cap:
 808         kmem_cache_destroy(ceph_inode_cachep);
 809         return error;
 810 }
 811
 812 static void destroy_caches(void)
 813 {
 814         /*
 815          * Make sure all delayed rcu free inodes are flushed before we
 816          * destroy cache.
 817          */
 818         rcu_barrier();
 819
 820         kmem_cache_destroy(ceph_inode_cachep);
 821         kmem_cache_destroy(ceph_cap_cachep);
 822         kmem_cache_destroy(ceph_cap_flush_cachep);
 823         kmem_cache_destroy(ceph_dentry_cachep);
 824         kmem_cache_destroy(ceph_file_cachep);
 825         kmem_cache_destroy(ceph_dir_file_cachep);
 826
 827         ceph_fscache_unregister();
 828 }
 829
 830
 831 /*
 832  * ceph_umount_begin - initiate forced umount.  Tear down down the
 833  * mount, skipping steps that may hang while waiting for server(s).
 834  */
 835 static void ceph_umount_begin(struct super_block *sb)
 836 {
 837         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 838
 839         dout("ceph_umount_begin - starting forced umount\n");
 840         if (!fsc)
 841                 return;
 842         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 843         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 844         ceph_mdsc_force_umount(fsc->mdsc);
 845         return;
 846 }
 847
 848 static const struct super_operations ceph_super_ops = {
 849         .alloc_inode    = ceph_alloc_inode,
 850         .destroy_inode  = ceph_destroy_inode,
 851         .write_inode    = ceph_write_inode,
 852         .drop_inode     = ceph_drop_inode,
 853         .sync_fs        = ceph_sync_fs,
 854         .put_super      = ceph_put_super,
 855         .show_options   = ceph_show_options,
 856         .statfs         = ceph_statfs,
 857         .umount_begin   = ceph_umount_begin,
 858 };
 859
 860 /*
 861  * Bootstrap mount by opening the root directory.  Note the mount
 862  * @started time from caller, and time out if this takes too long.
 863  */
 864 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 865                                        const char *path,
 866                                        unsigned long started)
 867 {
 868         struct ceph_mds_client *mdsc = fsc->mdsc;
 869         struct ceph_mds_request *req = NULL;
 870         int err;
 871         struct dentry *root;
 872
 873         /* open dir */
 874         dout("open_root_inode opening '%s'\n", path);
 875         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 876         if (IS_ERR(req))
 877                 return ERR_CAST(req);
 878         req->r_path1 = kstrdup(path, GFP_NOFS);
 879         if (!req->r_path1) {
 880                 root = ERR_PTR(-ENOMEM);
 881                 goto out;
 882         }
 883
 884         req->r_ino1.ino = CEPH_INO_ROOT;
 885         req->r_ino1.snap = CEPH_NOSNAP;
 886         req->r_started = started;
 887         req->r_timeout = fsc->client->options->mount_timeout;
 888         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 889         req->r_num_caps = 2;
 890         err = ceph_mdsc_do_request(mdsc, NULL, req);
 891         if (err == 0) {
 892                 struct inode *inode = req->r_target_inode;
 893                 req->r_target_inode = NULL;
 894                 dout("open_root_inode success\n");
 895                 root = d_make_root(inode);
 896                 if (!root) {
 897                         root = ERR_PTR(-ENOMEM);
 898                         goto out;
 899                 }
 900                 dout("open_root_inode success, root dentry is %p\n", root);
 901         } else {
 902                 root = ERR_PTR(err);
 903         }
 904 out:
 905         ceph_mdsc_put_request(req);
 906         return root;
 907 }
 908
 909
 910
 911
 912 /*
 913  * mount: join the ceph cluster, and open root directory.
 914  */
 915 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 916 {
 917         int err;
 918         unsigned long started = jiffies;  /* note the start time */
 919         struct dentry *root;
 920
 921         dout("mount start %p\n", fsc);
 922         mutex_lock(&fsc->client->mount_mutex);
 923
 924         if (!fsc->sb->s_root) {
 925                 const char *path;
 926                 err = __ceph_open_session(fsc->client, started);
 927                 if (err < 0)
 928                         goto out;
 929
 930                 /* setup fscache */
 931                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 932                         err = ceph_fscache_register_fs(fsc);
 933                         if (err < 0)
 934                                 goto out;
 935                 }
 936
 937                 if (!fsc->mount_options->server_path) {
 938                         path = "";
 939                         dout("mount opening path \\t\n");
 940                 } else {
 941                         path = fsc->mount_options->server_path + 1;
 942                         dout("mount opening path %s\n", path);
 943                 }
 944
 945                 err = ceph_fs_debugfs_init(fsc);
 946                 if (err < 0)
 947                         goto out;
 948
 949                 root = open_root_dentry(fsc, path, started);
 950                 if (IS_ERR(root)) {
 951                         err = PTR_ERR(root);
 952                         goto out;
 953                 }
 954                 fsc->sb->s_root = dget(root);
 955         } else {
 956                 root = dget(fsc->sb->s_root);
 957         }
 958
 959         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 960         dout("mount success\n");
 961         mutex_unlock(&fsc->client->mount_mutex);
 962         return root;
 963
 964 out:
 965         mutex_unlock(&fsc->client->mount_mutex);
 966         return ERR_PTR(err);
 967 }
 968
 969 static int ceph_set_super(struct super_block *s, void *data)
 970 {
 971         struct ceph_fs_client *fsc = data;
 972         int ret;
 973
 974         dout("set_super %p data %p\n", s, data);
 975
 976         s->s_flags = fsc->mount_options->sb_flags;
 977         s->s_maxbytes = MAX_LFS_FILESIZE;
 978
 979         s->s_xattr = ceph_xattr_handlers;
 980         s->s_fs_info = fsc;
 981         fsc->sb = s;
 982         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 983
 984         s->s_op = &ceph_super_ops;
 985         s->s_d_op = &ceph_dentry_ops;
 986         s->s_export_op = &ceph_export_ops;
 987
 988         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 989
 990         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 991         if (ret != 0)
 992                 goto fail;
 993
 994         return ret;
 995
 996 fail:
 997         s->s_fs_info = NULL;
 998         fsc->sb = NULL;
 999         return ret;
1000 }
1001
1002 /*
1003  * share superblock if same fs AND options
1004  */
1005 static int ceph_compare_super(struct super_block *sb, void *data)
1006 {
1007         struct ceph_fs_client *new = data;
1008         struct ceph_mount_options *fsopt = new->mount_options;
1009         struct ceph_options *opt = new->client->options;
1010         struct ceph_fs_client *other = ceph_sb_to_client(sb);
1011
1012         dout("ceph_compare_super %p\n", sb);
1013
1014         if (compare_mount_options(fsopt, opt, other)) {
1015                 dout("monitor(s)/mount options don't match\n");
1016                 return 0;
1017         }
1018         if ((opt->flags & CEPH_OPT_FSID) &&
1019             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1020                 dout("fsid doesn't match\n");
1021                 return 0;
1022         }
1023         if (fsopt->sb_flags != other->mount_options->sb_flags) {
1024                 dout("flags differ\n");
1025                 return 0;
1026         }
1027         return 1;
1028 }
1029
1030 /*
1031  * construct our own bdi so we can control readahead, etc.
1032  */
1033 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1034
1035 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1036 {
1037         int err;
1038
1039         err = super_setup_bdi_name(sb, "ceph-%ld",
1040                                    atomic_long_inc_return(&bdi_seq));
1041         if (err)
1042                 return err;
1043
1044         /* set ra_pages based on rasize mount option? */
1045         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1046
1047         /* set io_pages based on max osd read size */
1048         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1049
1050         return 0;
1051 }
1052
1053 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1054                        int flags, const char *dev_name, void *data)
1055 {
1056         struct super_block *sb;
1057         struct ceph_fs_client *fsc;
1058         struct dentry *res;
1059         int err;
1060         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1061         struct ceph_mount_options *fsopt = NULL;
1062         struct ceph_options *opt = NULL;
1063
1064         dout("ceph_mount\n");
1065
1066 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1067         flags |= SB_POSIXACL;
1068 #endif
1069         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1070         if (err < 0) {
1071                 res = ERR_PTR(err);
1072                 goto out_final;
1073         }
1074
1075         /* create client (which we may/may not use) */
1076         fsc = create_fs_client(fsopt, opt);
1077         if (IS_ERR(fsc)) {
1078                 res = ERR_CAST(fsc);
1079                 goto out_final;
1080         }
1081
1082         err = ceph_mdsc_init(fsc);
1083         if (err < 0) {
1084                 res = ERR_PTR(err);
1085                 goto out;
1086         }
1087
1088         if (ceph_test_opt(fsc->client, NOSHARE))
1089                 compare_super = NULL;
1090         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1091         if (IS_ERR(sb)) {
1092                 res = ERR_CAST(sb);
1093                 goto out;
1094         }
1095
1096         if (ceph_sb_to_client(sb) != fsc) {
1097                 ceph_mdsc_destroy(fsc);
1098                 destroy_fs_client(fsc);
1099                 fsc = ceph_sb_to_client(sb);
1100                 dout("get_sb got existing client %p\n", fsc);
1101         } else {
1102                 dout("get_sb using new client %p\n", fsc);
1103                 err = ceph_setup_bdi(sb, fsc);
1104                 if (err < 0) {
1105                         res = ERR_PTR(err);
1106                         goto out_splat;
1107                 }
1108         }
1109
1110         res = ceph_real_mount(fsc);
1111         if (IS_ERR(res))
1112                 goto out_splat;
1113         dout("root %p inode %p ino %llx.%llx\n", res,
1114              d_inode(res), ceph_vinop(d_inode(res)));
1115         return res;
1116
1117 out_splat:
1118         ceph_mdsc_close_sessions(fsc->mdsc);
1119         deactivate_locked_super(sb);
1120         goto out_final;
1121
1122 out:
1123         ceph_mdsc_destroy(fsc);
1124         destroy_fs_client(fsc);
1125 out_final:
1126         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1127         return res;
1128 }
1129
1130 static void ceph_kill_sb(struct super_block *s)
1131 {
1132         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1133         dev_t dev = s->s_dev;
1134
1135         dout("kill_sb %p\n", s);
1136
1137         ceph_mdsc_pre_umount(fsc->mdsc);
1138         flush_fs_workqueues(fsc);
1139
1140         generic_shutdown_super(s);
1141
1142         fsc->client->extra_mon_dispatch = NULL;
1143         ceph_fs_debugfs_cleanup(fsc);
1144
1145         ceph_fscache_unregister_fs(fsc);
1146
1147         ceph_mdsc_destroy(fsc);
1148
1149         destroy_fs_client(fsc);
1150         free_anon_bdev(dev);
1151 }
1152
1153 static struct file_system_type ceph_fs_type = {
1154         .owner          = THIS_MODULE,
1155         .name           = "ceph",
1156         .mount          = ceph_mount,
1157         .kill_sb        = ceph_kill_sb,
1158         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1159 };
1160 MODULE_ALIAS_FS("ceph");
1161
1162 static int __init init_ceph(void)
1163 {
1164         int ret = init_caches();
1165         if (ret)
1166                 goto out;
1167
1168         ceph_flock_init();
1169         ceph_xattr_init();
1170         ret = register_filesystem(&ceph_fs_type);
1171         if (ret)
1172                 goto out_xattr;
1173
1174         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1175
1176         return 0;
1177
1178 out_xattr:
1179         ceph_xattr_exit();
1180         destroy_caches();
1181 out:
1182         return ret;
1183 }
1184
1185 static void __exit exit_ceph(void)
1186 {
1187         dout("exit_ceph\n");
1188         unregister_filesystem(&ceph_fs_type);
1189         ceph_xattr_exit();
1190         destroy_caches();
1191 }
1192
1193 module_init(init_ceph);
1194 module_exit(exit_ceph);
1195
1196 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1197 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1198 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1199 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1200 MODULE_LICENSE("GPL");