fs/ceph/super.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/ceph/ceph_debug.h>
   4
   5 #include <linux/backing-dev.h>
   6 #include <linux/ctype.h>
   7 #include <linux/fs.h>
   8 #include <linux/inet.h>
   9 #include <linux/in6.h>
  10 #include <linux/module.h>
  11 #include <linux/mount.h>
  12 #include <linux/parser.h>
  13 #include <linux/sched.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/slab.h>
  16 #include <linux/statfs.h>
  17 #include <linux/string.h>
  18
  19 #include "super.h"
  20 #include "mds_client.h"
  21 #include "cache.h"
  22
  23 #include <linux/ceph/ceph_features.h>
  24 #include <linux/ceph/decode.h>
  25 #include <linux/ceph/mon_client.h>
  26 #include <linux/ceph/auth.h>
  27 #include <linux/ceph/debugfs.h>
  28
  29 /*
  30  * Ceph superblock operations
  31  *
  32  * Handle the basics of mounting, unmounting.
  33  */
  34
  35 /*
  36  * super ops
  37  */
  38 static void ceph_put_super(struct super_block *s)
  39 {
  40         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  41
  42         dout("put_super\n");
  43         ceph_mdsc_close_sessions(fsc->mdsc);
  44 }
  45
  46 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  47 {
  48         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  49         struct ceph_mon_client *monc = &fsc->client->monc;
  50         struct ceph_statfs st;
  51         u64 fsid;
  52         int err;
  53         u64 data_pool;
  54
  55         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  56                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  57         } else {
  58                 data_pool = CEPH_NOPOOL;
  59         }
  60
  61         dout("statfs\n");
  62         err = ceph_monc_do_statfs(monc, data_pool, &st);
  63         if (err < 0)
  64                 return err;
  65
  66         /* fill in kstatfs */
  67         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  68
  69         /*
  70          * express utilization in terms of large blocks to avoid
  71          * overflow on 32-bit machines.
  72          *
  73          * NOTE: for the time being, we make bsize == frsize to humor
  74          * not-yet-ancient versions of glibc that are broken.
  75          * Someday, we will probably want to report a real block
  76          * size...  whatever that may mean for a network file system!
  77          */
  78         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  79         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  80
  81         /*
  82          * By default use root quota for stats; fallback to overall filesystem
  83          * usage if using 'noquotadf' mount option or if the root dir doesn't
  84          * have max_bytes quota set.
  85          */
  86         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  87             !ceph_quota_update_statfs(fsc, buf)) {
  88                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  89                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  90                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  91         }
  92
  93         buf->f_files = le64_to_cpu(st.num_objects);
  94         buf->f_ffree = -1;
  95         buf->f_namelen = NAME_MAX;
  96
  97         /* Must convert the fsid, for consistent values across arches */
  98         mutex_lock(&monc->mutex);
  99         fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
 100                le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 101         mutex_unlock(&monc->mutex);
 102
 103         buf->f_fsid.val[0] = fsid & 0xffffffff;
 104         buf->f_fsid.val[1] = fsid >> 32;
 105
 106         return 0;
 107 }
 108
 109
 110 static int ceph_sync_fs(struct super_block *sb, int wait)
 111 {
 112         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 113
 114         if (!wait) {
 115                 dout("sync_fs (non-blocking)\n");
 116                 ceph_flush_dirty_caps(fsc->mdsc);
 117                 dout("sync_fs (non-blocking) done\n");
 118                 return 0;
 119         }
 120
 121         dout("sync_fs (blocking)\n");
 122         ceph_osdc_sync(&fsc->client->osdc);
 123         ceph_mdsc_sync(fsc->mdsc);
 124         dout("sync_fs (blocking) done\n");
 125         return 0;
 126 }
 127
 128 /*
 129  * mount options
 130  */
 131 enum {
 132         Opt_wsize,
 133         Opt_rsize,
 134         Opt_rasize,
 135         Opt_caps_wanted_delay_min,
 136         Opt_caps_wanted_delay_max,
 137         Opt_caps_max,
 138         Opt_readdir_max_entries,
 139         Opt_readdir_max_bytes,
 140         Opt_congestion_kb,
 141         Opt_last_int,
 142         /* int args above */
 143         Opt_snapdirname,
 144         Opt_mds_namespace,
 145         Opt_fscache_uniq,
 146         Opt_recover_session,
 147         Opt_last_string,
 148         /* string args above */
 149         Opt_dirstat,
 150         Opt_nodirstat,
 151         Opt_rbytes,
 152         Opt_norbytes,
 153         Opt_asyncreaddir,
 154         Opt_noasyncreaddir,
 155         Opt_dcache,
 156         Opt_nodcache,
 157         Opt_ino32,
 158         Opt_noino32,
 159         Opt_fscache,
 160         Opt_nofscache,
 161         Opt_poolperm,
 162         Opt_nopoolperm,
 163         Opt_require_active_mds,
 164         Opt_norequire_active_mds,
 165 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 166         Opt_acl,
 167 #endif
 168         Opt_noacl,
 169         Opt_quotadf,
 170         Opt_noquotadf,
 171         Opt_copyfrom,
 172         Opt_nocopyfrom,
 173 };
 174
 175 static match_table_t fsopt_tokens = {
 176         {Opt_wsize, "wsize=%d"},
 177         {Opt_rsize, "rsize=%d"},
 178         {Opt_rasize, "rasize=%d"},
 179         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 180         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 181         {Opt_caps_max, "caps_max=%d"},
 182         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 183         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 184         {Opt_congestion_kb, "write_congestion_kb=%d"},
 185         /* int args above */
 186         {Opt_snapdirname, "snapdirname=%s"},
 187         {Opt_mds_namespace, "mds_namespace=%s"},
 188         {Opt_recover_session, "recover_session=%s"},
 189         {Opt_fscache_uniq, "fsc=%s"},
 190         /* string args above */
 191         {Opt_dirstat, "dirstat"},
 192         {Opt_nodirstat, "nodirstat"},
 193         {Opt_rbytes, "rbytes"},
 194         {Opt_norbytes, "norbytes"},
 195         {Opt_asyncreaddir, "asyncreaddir"},
 196         {Opt_noasyncreaddir, "noasyncreaddir"},
 197         {Opt_dcache, "dcache"},
 198         {Opt_nodcache, "nodcache"},
 199         {Opt_ino32, "ino32"},
 200         {Opt_noino32, "noino32"},
 201         {Opt_fscache, "fsc"},
 202         {Opt_nofscache, "nofsc"},
 203         {Opt_poolperm, "poolperm"},
 204         {Opt_nopoolperm, "nopoolperm"},
 205         {Opt_require_active_mds, "require_active_mds"},
 206         {Opt_norequire_active_mds, "norequire_active_mds"},
 207 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 208         {Opt_acl, "acl"},
 209 #endif
 210         {Opt_noacl, "noacl"},
 211         {Opt_quotadf, "quotadf"},
 212         {Opt_noquotadf, "noquotadf"},
 213         {Opt_copyfrom, "copyfrom"},
 214         {Opt_nocopyfrom, "nocopyfrom"},
 215         {-1, NULL}
 216 };
 217
 218 static int parse_fsopt_token(char *c, void *private)
 219 {
 220         struct ceph_mount_options *fsopt = private;
 221         substring_t argstr[MAX_OPT_ARGS];
 222         int token, intval, ret;
 223
 224         token = match_token((char *)c, fsopt_tokens, argstr);
 225         if (token < 0)
 226                 return -EINVAL;
 227
 228         if (token < Opt_last_int) {
 229                 ret = match_int(&argstr[0], &intval);
 230                 if (ret < 0) {
 231                         pr_err("bad option arg (not int) at '%s'\n", c);
 232                         return ret;
 233                 }
 234                 dout("got int token %d val %d\n", token, intval);
 235         } else if (token > Opt_last_int && token < Opt_last_string) {
 236                 dout("got string token %d val %s\n", token,
 237                      argstr[0].from);
 238         } else {
 239                 dout("got token %d\n", token);
 240         }
 241
 242         switch (token) {
 243         case Opt_snapdirname:
 244                 kfree(fsopt->snapdir_name);
 245                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 246                                                argstr[0].to-argstr[0].from,
 247                                                GFP_KERNEL);
 248                 if (!fsopt->snapdir_name)
 249                         return -ENOMEM;
 250                 break;
 251         case Opt_mds_namespace:
 252                 kfree(fsopt->mds_namespace);
 253                 fsopt->mds_namespace = kstrndup(argstr[0].from,
 254                                                 argstr[0].to-argstr[0].from,
 255                                                 GFP_KERNEL);
 256                 if (!fsopt->mds_namespace)
 257                         return -ENOMEM;
 258                 break;
 259         case Opt_recover_session:
 260                 if (!strncmp(argstr[0].from, "no",
 261                              argstr[0].to - argstr[0].from)) {
 262                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 263                 } else if (!strncmp(argstr[0].from, "clean",
 264                                     argstr[0].to - argstr[0].from)) {
 265                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 266                 } else {
 267                         return -EINVAL;
 268                 }
 269                 break;
 270         case Opt_fscache_uniq:
 271                 kfree(fsopt->fscache_uniq);
 272                 fsopt->fscache_uniq = kstrndup(argstr[0].from,
 273                                                argstr[0].to-argstr[0].from,
 274                                                GFP_KERNEL);
 275                 if (!fsopt->fscache_uniq)
 276                         return -ENOMEM;
 277                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 278                 break;
 279                 /* misc */
 280         case Opt_wsize:
 281                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE)
 282                         return -EINVAL;
 283                 fsopt->wsize = ALIGN(intval, PAGE_SIZE);
 284                 break;
 285         case Opt_rsize:
 286                 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE)
 287                         return -EINVAL;
 288                 fsopt->rsize = ALIGN(intval, PAGE_SIZE);
 289                 break;
 290         case Opt_rasize:
 291                 if (intval < 0)
 292                         return -EINVAL;
 293                 fsopt->rasize = ALIGN(intval, PAGE_SIZE);
 294                 break;
 295         case Opt_caps_wanted_delay_min:
 296                 if (intval < 1)
 297                         return -EINVAL;
 298                 fsopt->caps_wanted_delay_min = intval;
 299                 break;
 300         case Opt_caps_wanted_delay_max:
 301                 if (intval < 1)
 302                         return -EINVAL;
 303                 fsopt->caps_wanted_delay_max = intval;
 304                 break;
 305         case Opt_caps_max:
 306                 if (intval < 0)
 307                         return -EINVAL;
 308                 fsopt->caps_max = intval;
 309                 break;
 310         case Opt_readdir_max_entries:
 311                 if (intval < 1)
 312                         return -EINVAL;
 313                 fsopt->max_readdir = intval;
 314                 break;
 315         case Opt_readdir_max_bytes:
 316                 if (intval < (int)PAGE_SIZE && intval != 0)
 317                         return -EINVAL;
 318                 fsopt->max_readdir_bytes = intval;
 319                 break;
 320         case Opt_congestion_kb:
 321                 if (intval < 1024) /* at least 1M */
 322                         return -EINVAL;
 323                 fsopt->congestion_kb = intval;
 324                 break;
 325         case Opt_dirstat:
 326                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 327                 break;
 328         case Opt_nodirstat:
 329                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 330                 break;
 331         case Opt_rbytes:
 332                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 333                 break;
 334         case Opt_norbytes:
 335                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 336                 break;
 337         case Opt_asyncreaddir:
 338                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 339                 break;
 340         case Opt_noasyncreaddir:
 341                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 342                 break;
 343         case Opt_dcache:
 344                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 345                 break;
 346         case Opt_nodcache:
 347                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 348                 break;
 349         case Opt_ino32:
 350                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 351                 break;
 352         case Opt_noino32:
 353                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 354                 break;
 355         case Opt_fscache:
 356                 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 357                 kfree(fsopt->fscache_uniq);
 358                 fsopt->fscache_uniq = NULL;
 359                 break;
 360         case Opt_nofscache:
 361                 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 362                 kfree(fsopt->fscache_uniq);
 363                 fsopt->fscache_uniq = NULL;
 364                 break;
 365         case Opt_poolperm:
 366                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 367                 break;
 368         case Opt_nopoolperm:
 369                 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 370                 break;
 371         case Opt_require_active_mds:
 372                 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 373                 break;
 374         case Opt_norequire_active_mds:
 375                 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 376                 break;
 377         case Opt_quotadf:
 378                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 379                 break;
 380         case Opt_noquotadf:
 381                 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 382                 break;
 383         case Opt_copyfrom:
 384                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 385                 break;
 386         case Opt_nocopyfrom:
 387                 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 388                 break;
 389 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 390         case Opt_acl:
 391                 fsopt->sb_flags |= SB_POSIXACL;
 392                 break;
 393 #endif
 394         case Opt_noacl:
 395                 fsopt->sb_flags &= ~SB_POSIXACL;
 396                 break;
 397         default:
 398                 BUG_ON(token);
 399         }
 400         return 0;
 401 }
 402
 403 static void destroy_mount_options(struct ceph_mount_options *args)
 404 {
 405         dout("destroy_mount_options %p\n", args);
 406         kfree(args->snapdir_name);
 407         kfree(args->mds_namespace);
 408         kfree(args->server_path);
 409         kfree(args->fscache_uniq);
 410         kfree(args);
 411 }
 412
 413 static int strcmp_null(const char *s1, const char *s2)
 414 {
 415         if (!s1 && !s2)
 416                 return 0;
 417         if (s1 && !s2)
 418                 return -1;
 419         if (!s1 && s2)
 420                 return 1;
 421         return strcmp(s1, s2);
 422 }
 423
 424 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 425                                  struct ceph_options *new_opt,
 426                                  struct ceph_fs_client *fsc)
 427 {
 428         struct ceph_mount_options *fsopt1 = new_fsopt;
 429         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 430         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 431         int ret;
 432
 433         ret = memcmp(fsopt1, fsopt2, ofs);
 434         if (ret)
 435                 return ret;
 436
 437         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 438         if (ret)
 439                 return ret;
 440         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 441         if (ret)
 442                 return ret;
 443         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 444         if (ret)
 445                 return ret;
 446         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 447         if (ret)
 448                 return ret;
 449
 450         return ceph_compare_options(new_opt, fsc->client);
 451 }
 452
 453 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 454                                struct ceph_options **popt,
 455                                int flags, char *options,
 456                                const char *dev_name)
 457 {
 458         struct ceph_mount_options *fsopt;
 459         const char *dev_name_end;
 460         int err;
 461
 462         if (!dev_name || !*dev_name)
 463                 return -EINVAL;
 464
 465         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 466         if (!fsopt)
 467                 return -ENOMEM;
 468
 469         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 470
 471         fsopt->sb_flags = flags;
 472         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 473
 474         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
 475         fsopt->rsize = CEPH_MAX_READ_SIZE;
 476         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 477         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 478         if (!fsopt->snapdir_name) {
 479                 err = -ENOMEM;
 480                 goto out;
 481         }
 482
 483         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 484         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 485         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 486         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 487         fsopt->congestion_kb = default_congestion_kb();
 488
 489         /*
 490          * Distinguish the server list from the path in "dev_name".
 491          * Internally we do not include the leading '/' in the path.
 492          *
 493          * "dev_name" will look like:
 494          *     <server_spec>[,<server_spec>...]:[<path>]
 495          * where
 496          *     <server_spec> is <ip>[:<port>]
 497          *     <path> is optional, but if present must begin with '/'
 498          */
 499         dev_name_end = strchr(dev_name, '/');
 500         if (dev_name_end) {
 501                 if (strlen(dev_name_end) > 1) {
 502                         fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 503                         if (!fsopt->server_path) {
 504                                 err = -ENOMEM;
 505                                 goto out;
 506                         }
 507                 }
 508         } else {
 509                 dev_name_end = dev_name + strlen(dev_name);
 510         }
 511         err = -EINVAL;
 512         dev_name_end--;         /* back up to ':' separator */
 513         if (dev_name_end < dev_name || *dev_name_end != ':') {
 514                 pr_err("device name is missing path (no : separator in %s)\n",
 515                                 dev_name);
 516                 goto out;
 517         }
 518         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 519         if (fsopt->server_path)
 520                 dout("server path '%s'\n", fsopt->server_path);
 521
 522         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 523                                  parse_fsopt_token, (void *)fsopt);
 524         if (IS_ERR(*popt)) {
 525                 err = PTR_ERR(*popt);
 526                 goto out;
 527         }
 528
 529         /* success */
 530         *pfsopt = fsopt;
 531         return 0;
 532
 533 out:
 534         destroy_mount_options(fsopt);
 535         return err;
 536 }
 537
 538 /**
 539  * ceph_show_options - Show mount options in /proc/mounts
 540  * @m: seq_file to write to
 541  * @root: root of that (sub)tree
 542  */
 543 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 544 {
 545         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 546         struct ceph_mount_options *fsopt = fsc->mount_options;
 547         size_t pos;
 548         int ret;
 549
 550         /* a comma between MNT/MS and client options */
 551         seq_putc(m, ',');
 552         pos = m->count;
 553
 554         ret = ceph_print_client_options(m, fsc->client, false);
 555         if (ret)
 556                 return ret;
 557
 558         /* retract our comma if no client options */
 559         if (m->count == pos)
 560                 m->count--;
 561
 562         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 563                 seq_puts(m, ",dirstat");
 564         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 565                 seq_puts(m, ",rbytes");
 566         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 567                 seq_puts(m, ",noasyncreaddir");
 568         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 569                 seq_puts(m, ",nodcache");
 570         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 571                 seq_puts(m, ",ino32");
 572         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 573                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 574         }
 575         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 576                 seq_puts(m, ",nopoolperm");
 577         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 578                 seq_puts(m, ",noquotadf");
 579
 580 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 581         if (fsopt->sb_flags & SB_POSIXACL)
 582                 seq_puts(m, ",acl");
 583         else
 584                 seq_puts(m, ",noacl");
 585 #endif
 586
 587         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 588                 seq_puts(m, ",copyfrom");
 589
 590         if (fsopt->mds_namespace)
 591                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 592
 593         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 594                 seq_show_option(m, "recover_session", "clean");
 595
 596         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 597                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 598         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 599                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 600         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 601                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 602         if (fsopt->congestion_kb != default_congestion_kb())
 603                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 604         if (fsopt->caps_max)
 605                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 606         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 607                 seq_printf(m, ",caps_wanted_delay_min=%d",
 608                          fsopt->caps_wanted_delay_min);
 609         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 610                 seq_printf(m, ",caps_wanted_delay_max=%d",
 611                            fsopt->caps_wanted_delay_max);
 612         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 613                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 614         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 615                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 616         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 617                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 618
 619         return 0;
 620 }
 621
 622 /*
 623  * handle any mon messages the standard library doesn't understand.
 624  * return error if we don't either.
 625  */
 626 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 627 {
 628         struct ceph_fs_client *fsc = client->private;
 629         int type = le16_to_cpu(msg->hdr.type);
 630
 631         switch (type) {
 632         case CEPH_MSG_MDS_MAP:
 633                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 634                 return 0;
 635         case CEPH_MSG_FS_MAP_USER:
 636                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 637                 return 0;
 638         default:
 639                 return -1;
 640         }
 641 }
 642
 643 /*
 644  * create a new fs client
 645  *
 646  * Success or not, this function consumes @fsopt and @opt.
 647  */
 648 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 649                                         struct ceph_options *opt)
 650 {
 651         struct ceph_fs_client *fsc;
 652         int page_count;
 653         size_t size;
 654         int err;
 655
 656         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 657         if (!fsc) {
 658                 err = -ENOMEM;
 659                 goto fail;
 660         }
 661
 662         fsc->client = ceph_create_client(opt, fsc);
 663         if (IS_ERR(fsc->client)) {
 664                 err = PTR_ERR(fsc->client);
 665                 goto fail;
 666         }
 667         opt = NULL; /* fsc->client now owns this */
 668
 669         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 670         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 671
 672         if (!fsopt->mds_namespace) {
 673                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 674                                    0, true);
 675         } else {
 676                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 677                                    0, false);
 678         }
 679
 680         fsc->mount_options = fsopt;
 681
 682         fsc->sb = NULL;
 683         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 684         fsc->filp_gen = 1;
 685
 686         atomic_long_set(&fsc->writeback_count, 0);
 687
 688         err = -ENOMEM;
 689         /*
 690          * The number of concurrent works can be high but they don't need
 691          * to be processed in parallel, limit concurrency.
 692          */
 693         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 694         if (!fsc->inode_wq)
 695                 goto fail_client;
 696         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 697         if (!fsc->cap_wq)
 698                 goto fail_inode_wq;
 699
 700         /* set up mempools */
 701         err = -ENOMEM;
 702         page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 703         size = sizeof (struct page *) * (page_count ? page_count : 1);
 704         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 705         if (!fsc->wb_pagevec_pool)
 706                 goto fail_cap_wq;
 707
 708         return fsc;
 709
 710 fail_cap_wq:
 711         destroy_workqueue(fsc->cap_wq);
 712 fail_inode_wq:
 713         destroy_workqueue(fsc->inode_wq);
 714 fail_client:
 715         ceph_destroy_client(fsc->client);
 716 fail:
 717         kfree(fsc);
 718         if (opt)
 719                 ceph_destroy_options(opt);
 720         destroy_mount_options(fsopt);
 721         return ERR_PTR(err);
 722 }
 723
 724 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 725 {
 726         flush_workqueue(fsc->inode_wq);
 727         flush_workqueue(fsc->cap_wq);
 728 }
 729
 730 static void destroy_fs_client(struct ceph_fs_client *fsc)
 731 {
 732         dout("destroy_fs_client %p\n", fsc);
 733
 734         ceph_mdsc_destroy(fsc);
 735         destroy_workqueue(fsc->inode_wq);
 736         destroy_workqueue(fsc->cap_wq);
 737
 738         mempool_destroy(fsc->wb_pagevec_pool);
 739
 740         destroy_mount_options(fsc->mount_options);
 741
 742         ceph_destroy_client(fsc->client);
 743
 744         kfree(fsc);
 745         dout("destroy_fs_client %p done\n", fsc);
 746 }
 747
 748 /*
 749  * caches
 750  */
 751 struct kmem_cache *ceph_inode_cachep;
 752 struct kmem_cache *ceph_cap_cachep;
 753 struct kmem_cache *ceph_cap_flush_cachep;
 754 struct kmem_cache *ceph_dentry_cachep;
 755 struct kmem_cache *ceph_file_cachep;
 756 struct kmem_cache *ceph_dir_file_cachep;
 757
 758 static void ceph_inode_init_once(void *foo)
 759 {
 760         struct ceph_inode_info *ci = foo;
 761         inode_init_once(&ci->vfs_inode);
 762 }
 763
 764 static int __init init_caches(void)
 765 {
 766         int error = -ENOMEM;
 767
 768         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 769                                       sizeof(struct ceph_inode_info),
 770                                       __alignof__(struct ceph_inode_info),
 771                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 772                                       SLAB_ACCOUNT, ceph_inode_init_once);
 773         if (!ceph_inode_cachep)
 774                 return -ENOMEM;
 775
 776         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 777         if (!ceph_cap_cachep)
 778                 goto bad_cap;
 779         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 780                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 781         if (!ceph_cap_flush_cachep)
 782                 goto bad_cap_flush;
 783
 784         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 785                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 786         if (!ceph_dentry_cachep)
 787                 goto bad_dentry;
 788
 789         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 790         if (!ceph_file_cachep)
 791                 goto bad_file;
 792
 793         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 794         if (!ceph_dir_file_cachep)
 795                 goto bad_dir_file;
 796
 797         error = ceph_fscache_register();
 798         if (error)
 799                 goto bad_fscache;
 800
 801         return 0;
 802
 803 bad_fscache:
 804         kmem_cache_destroy(ceph_dir_file_cachep);
 805 bad_dir_file:
 806         kmem_cache_destroy(ceph_file_cachep);
 807 bad_file:
 808         kmem_cache_destroy(ceph_dentry_cachep);
 809 bad_dentry:
 810         kmem_cache_destroy(ceph_cap_flush_cachep);
 811 bad_cap_flush:
 812         kmem_cache_destroy(ceph_cap_cachep);
 813 bad_cap:
 814         kmem_cache_destroy(ceph_inode_cachep);
 815         return error;
 816 }
 817
 818 static void destroy_caches(void)
 819 {
 820         /*
 821          * Make sure all delayed rcu free inodes are flushed before we
 822          * destroy cache.
 823          */
 824         rcu_barrier();
 825
 826         kmem_cache_destroy(ceph_inode_cachep);
 827         kmem_cache_destroy(ceph_cap_cachep);
 828         kmem_cache_destroy(ceph_cap_flush_cachep);
 829         kmem_cache_destroy(ceph_dentry_cachep);
 830         kmem_cache_destroy(ceph_file_cachep);
 831         kmem_cache_destroy(ceph_dir_file_cachep);
 832
 833         ceph_fscache_unregister();
 834 }
 835
 836
 837 /*
 838  * ceph_umount_begin - initiate forced umount.  Tear down down the
 839  * mount, skipping steps that may hang while waiting for server(s).
 840  */
 841 static void ceph_umount_begin(struct super_block *sb)
 842 {
 843         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 844
 845         dout("ceph_umount_begin - starting forced umount\n");
 846         if (!fsc)
 847                 return;
 848         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 849         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 850         ceph_mdsc_force_umount(fsc->mdsc);
 851         fsc->filp_gen++; // invalidate open files
 852 }
 853
 854 static int ceph_remount(struct super_block *sb, int *flags, char *data)
 855 {
 856         sync_filesystem(sb);
 857         return 0;
 858 }
 859
 860 static const struct super_operations ceph_super_ops = {
 861         .alloc_inode    = ceph_alloc_inode,
 862         .free_inode     = ceph_free_inode,
 863         .write_inode    = ceph_write_inode,
 864         .drop_inode     = generic_delete_inode,
 865         .evict_inode    = ceph_evict_inode,
 866         .sync_fs        = ceph_sync_fs,
 867         .put_super      = ceph_put_super,
 868         .remount_fs     = ceph_remount,
 869         .show_options   = ceph_show_options,
 870         .statfs         = ceph_statfs,
 871         .umount_begin   = ceph_umount_begin,
 872 };
 873
 874 /*
 875  * Bootstrap mount by opening the root directory.  Note the mount
 876  * @started time from caller, and time out if this takes too long.
 877  */
 878 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 879                                        const char *path,
 880                                        unsigned long started)
 881 {
 882         struct ceph_mds_client *mdsc = fsc->mdsc;
 883         struct ceph_mds_request *req = NULL;
 884         int err;
 885         struct dentry *root;
 886
 887         /* open dir */
 888         dout("open_root_inode opening '%s'\n", path);
 889         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 890         if (IS_ERR(req))
 891                 return ERR_CAST(req);
 892         req->r_path1 = kstrdup(path, GFP_NOFS);
 893         if (!req->r_path1) {
 894                 root = ERR_PTR(-ENOMEM);
 895                 goto out;
 896         }
 897
 898         req->r_ino1.ino = CEPH_INO_ROOT;
 899         req->r_ino1.snap = CEPH_NOSNAP;
 900         req->r_started = started;
 901         req->r_timeout = fsc->client->options->mount_timeout;
 902         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 903         req->r_num_caps = 2;
 904         err = ceph_mdsc_do_request(mdsc, NULL, req);
 905         if (err == 0) {
 906                 struct inode *inode = req->r_target_inode;
 907                 req->r_target_inode = NULL;
 908                 dout("open_root_inode success\n");
 909                 root = d_make_root(inode);
 910                 if (!root) {
 911                         root = ERR_PTR(-ENOMEM);
 912                         goto out;
 913                 }
 914                 dout("open_root_inode success, root dentry is %p\n", root);
 915         } else {
 916                 root = ERR_PTR(err);
 917         }
 918 out:
 919         ceph_mdsc_put_request(req);
 920         return root;
 921 }
 922
 923
 924
 925
 926 /*
 927  * mount: join the ceph cluster, and open root directory.
 928  */
 929 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 930 {
 931         int err;
 932         unsigned long started = jiffies;  /* note the start time */
 933         struct dentry *root;
 934
 935         dout("mount start %p\n", fsc);
 936         mutex_lock(&fsc->client->mount_mutex);
 937
 938         if (!fsc->sb->s_root) {
 939                 const char *path;
 940                 err = __ceph_open_session(fsc->client, started);
 941                 if (err < 0)
 942                         goto out;
 943
 944                 /* setup fscache */
 945                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 946                         err = ceph_fscache_register_fs(fsc);
 947                         if (err < 0)
 948                                 goto out;
 949                 }
 950
 951                 if (!fsc->mount_options->server_path) {
 952                         path = "";
 953                         dout("mount opening path \\t\n");
 954                 } else {
 955                         path = fsc->mount_options->server_path + 1;
 956                         dout("mount opening path %s\n", path);
 957                 }
 958
 959                 ceph_fs_debugfs_init(fsc);
 960
 961                 root = open_root_dentry(fsc, path, started);
 962                 if (IS_ERR(root)) {
 963                         err = PTR_ERR(root);
 964                         goto out;
 965                 }
 966                 fsc->sb->s_root = dget(root);
 967         } else {
 968                 root = dget(fsc->sb->s_root);
 969         }
 970
 971         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 972         dout("mount success\n");
 973         mutex_unlock(&fsc->client->mount_mutex);
 974         return root;
 975
 976 out:
 977         mutex_unlock(&fsc->client->mount_mutex);
 978         return ERR_PTR(err);
 979 }
 980
 981 static int ceph_set_super(struct super_block *s, void *data)
 982 {
 983         struct ceph_fs_client *fsc = data;
 984         int ret;
 985
 986         dout("set_super %p data %p\n", s, data);
 987
 988         s->s_flags = fsc->mount_options->sb_flags;
 989         s->s_maxbytes = MAX_LFS_FILESIZE;
 990
 991         s->s_xattr = ceph_xattr_handlers;
 992         s->s_fs_info = fsc;
 993         fsc->sb = s;
 994         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 995
 996         s->s_op = &ceph_super_ops;
 997         s->s_d_op = &ceph_dentry_ops;
 998         s->s_export_op = &ceph_export_ops;
 999
1000         s->s_time_gran = 1;
1001         s->s_time_min = 0;
1002         s->s_time_max = U32_MAX;
1003
1004         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
1005         if (ret != 0)
1006                 goto fail;
1007
1008         return ret;
1009
1010 fail:
1011         s->s_fs_info = NULL;
1012         fsc->sb = NULL;
1013         return ret;
1014 }
1015
1016 /*
1017  * share superblock if same fs AND options
1018  */
1019 static int ceph_compare_super(struct super_block *sb, void *data)
1020 {
1021         struct ceph_fs_client *new = data;
1022         struct ceph_mount_options *fsopt = new->mount_options;
1023         struct ceph_options *opt = new->client->options;
1024         struct ceph_fs_client *other = ceph_sb_to_client(sb);
1025
1026         dout("ceph_compare_super %p\n", sb);
1027
1028         if (compare_mount_options(fsopt, opt, other)) {
1029                 dout("monitor(s)/mount options don't match\n");
1030                 return 0;
1031         }
1032         if ((opt->flags & CEPH_OPT_FSID) &&
1033             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1034                 dout("fsid doesn't match\n");
1035                 return 0;
1036         }
1037         if (fsopt->sb_flags != other->mount_options->sb_flags) {
1038                 dout("flags differ\n");
1039                 return 0;
1040         }
1041         return 1;
1042 }
1043
1044 /*
1045  * construct our own bdi so we can control readahead, etc.
1046  */
1047 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1048
1049 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1050 {
1051         int err;
1052
1053         err = super_setup_bdi_name(sb, "ceph-%ld",
1054                                    atomic_long_inc_return(&bdi_seq));
1055         if (err)
1056                 return err;
1057
1058         /* set ra_pages based on rasize mount option? */
1059         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1060
1061         /* set io_pages based on max osd read size */
1062         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1063
1064         return 0;
1065 }
1066
1067 static struct dentry *ceph_mount(struct file_system_type *fs_type,
1068                        int flags, const char *dev_name, void *data)
1069 {
1070         struct super_block *sb;
1071         struct ceph_fs_client *fsc;
1072         struct dentry *res;
1073         int err;
1074         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
1075         struct ceph_mount_options *fsopt = NULL;
1076         struct ceph_options *opt = NULL;
1077
1078         dout("ceph_mount\n");
1079
1080 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1081         flags |= SB_POSIXACL;
1082 #endif
1083         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
1084         if (err < 0) {
1085                 res = ERR_PTR(err);
1086                 goto out_final;
1087         }
1088
1089         /* create client (which we may/may not use) */
1090         fsc = create_fs_client(fsopt, opt);
1091         if (IS_ERR(fsc)) {
1092                 res = ERR_CAST(fsc);
1093                 goto out_final;
1094         }
1095
1096         err = ceph_mdsc_init(fsc);
1097         if (err < 0) {
1098                 res = ERR_PTR(err);
1099                 goto out;
1100         }
1101
1102         if (ceph_test_opt(fsc->client, NOSHARE))
1103                 compare_super = NULL;
1104         sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1105         if (IS_ERR(sb)) {
1106                 res = ERR_CAST(sb);
1107                 goto out;
1108         }
1109
1110         if (ceph_sb_to_client(sb) != fsc) {
1111                 destroy_fs_client(fsc);
1112                 fsc = ceph_sb_to_client(sb);
1113                 dout("get_sb got existing client %p\n", fsc);
1114         } else {
1115                 dout("get_sb using new client %p\n", fsc);
1116                 err = ceph_setup_bdi(sb, fsc);
1117                 if (err < 0) {
1118                         res = ERR_PTR(err);
1119                         goto out_splat;
1120                 }
1121         }
1122
1123         res = ceph_real_mount(fsc);
1124         if (IS_ERR(res))
1125                 goto out_splat;
1126         dout("root %p inode %p ino %llx.%llx\n", res,
1127              d_inode(res), ceph_vinop(d_inode(res)));
1128         return res;
1129
1130 out_splat:
1131         ceph_mdsc_close_sessions(fsc->mdsc);
1132         deactivate_locked_super(sb);
1133         goto out_final;
1134
1135 out:
1136         destroy_fs_client(fsc);
1137 out_final:
1138         dout("ceph_mount fail %ld\n", PTR_ERR(res));
1139         return res;
1140 }
1141
1142 static void ceph_kill_sb(struct super_block *s)
1143 {
1144         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1145         dev_t dev = s->s_dev;
1146
1147         dout("kill_sb %p\n", s);
1148
1149         ceph_mdsc_pre_umount(fsc->mdsc);
1150         flush_fs_workqueues(fsc);
1151
1152         generic_shutdown_super(s);
1153
1154         fsc->client->extra_mon_dispatch = NULL;
1155         ceph_fs_debugfs_cleanup(fsc);
1156
1157         ceph_fscache_unregister_fs(fsc);
1158
1159         destroy_fs_client(fsc);
1160         free_anon_bdev(dev);
1161 }
1162
1163 static struct file_system_type ceph_fs_type = {
1164         .owner          = THIS_MODULE,
1165         .name           = "ceph",
1166         .mount          = ceph_mount,
1167         .kill_sb        = ceph_kill_sb,
1168         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1169 };
1170 MODULE_ALIAS_FS("ceph");
1171
1172 int ceph_force_reconnect(struct super_block *sb)
1173 {
1174         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1175         int err = 0;
1176
1177         ceph_umount_begin(sb);
1178
1179         /* Make sure all page caches get invalidated.
1180          * see remove_session_caps_cb() */
1181         flush_workqueue(fsc->inode_wq);
1182
1183         /* In case that we were blacklisted. This also reset
1184          * all mon/osd connections */
1185         ceph_reset_client_addr(fsc->client);
1186
1187         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1188
1189         fsc->blacklisted = false;
1190         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1191
1192         if (sb->s_root) {
1193                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1194                                         CEPH_STAT_CAP_INODE, true);
1195         }
1196         return err;
1197 }
1198
1199 static int __init init_ceph(void)
1200 {
1201         int ret = init_caches();
1202         if (ret)
1203                 goto out;
1204
1205         ceph_flock_init();
1206         ret = register_filesystem(&ceph_fs_type);
1207         if (ret)
1208                 goto out_caches;
1209
1210         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1211
1212         return 0;
1213
1214 out_caches:
1215         destroy_caches();
1216 out:
1217         return ret;
1218 }
1219
1220 static void __exit exit_ceph(void)
1221 {
1222         dout("exit_ceph\n");
1223         unregister_filesystem(&ceph_fs_type);
1224         destroy_caches();
1225 }
1226
1227 module_init(init_ceph);
1228 module_exit(exit_ceph);
1229
1230 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1231 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1232 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1233 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1234 MODULE_LICENSE("GPL");