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