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/fs_context.h>
  13 #include <linux/fs_parser.h>
  14 #include <linux/sched.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/slab.h>
  17 #include <linux/statfs.h>
  18 #include <linux/string.h>
  19
  20 #include "super.h"
  21 #include "mds_client.h"
  22 #include "cache.h"
  23 #include "crypto.h"
  24
  25 #include <linux/ceph/ceph_features.h>
  26 #include <linux/ceph/decode.h>
  27 #include <linux/ceph/mon_client.h>
  28 #include <linux/ceph/auth.h>
  29 #include <linux/ceph/debugfs.h>
  30
  31 #include <uapi/linux/magic.h>
  32
  33 static DEFINE_SPINLOCK(ceph_fsc_lock);
  34 static LIST_HEAD(ceph_fsc_list);
  35
  36 /*
  37  * Ceph superblock operations
  38  *
  39  * Handle the basics of mounting, unmounting.
  40  */
  41
  42 /*
  43  * super ops
  44  */
  45 static void ceph_put_super(struct super_block *s)
  46 {
  47         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  48
  49         dout("put_super\n");
  50         ceph_fscrypt_free_dummy_policy(fsc);
  51         ceph_mdsc_close_sessions(fsc->mdsc);
  52 }
  53
  54 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  55 {
  56         struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  57         struct ceph_mon_client *monc = &fsc->client->monc;
  58         struct ceph_statfs st;
  59         int i, err;
  60         u64 data_pool;
  61
  62         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  63                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  64         } else {
  65                 data_pool = CEPH_NOPOOL;
  66         }
  67
  68         dout("statfs\n");
  69         err = ceph_monc_do_statfs(monc, data_pool, &st);
  70         if (err < 0)
  71                 return err;
  72
  73         /* fill in kstatfs */
  74         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  75
  76         /*
  77          * Express utilization in terms of large blocks to avoid
  78          * overflow on 32-bit machines.
  79          */
  80         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  81
  82         /*
  83          * By default use root quota for stats; fallback to overall filesystem
  84          * usage if using 'noquotadf' mount option or if the root dir doesn't
  85          * have max_bytes quota set.
  86          */
  87         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  88             !ceph_quota_update_statfs(fsc, buf)) {
  89                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  90                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  91                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  92         }
  93
  94         /*
  95          * NOTE: for the time being, we make bsize == frsize to humor
  96          * not-yet-ancient versions of glibc that are broken.
  97          * Someday, we will probably want to report a real block
  98          * size...  whatever that may mean for a network file system!
  99          */
 100         buf->f_bsize = buf->f_frsize;
 101
 102         buf->f_files = le64_to_cpu(st.num_objects);
 103         buf->f_ffree = -1;
 104         buf->f_namelen = NAME_MAX;
 105
 106         /* Must convert the fsid, for consistent values across arches */
 107         buf->f_fsid.val[0] = 0;
 108         mutex_lock(&monc->mutex);
 109         for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
 110                 buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
 111         mutex_unlock(&monc->mutex);
 112
 113         /* fold the fs_cluster_id into the upper bits */
 114         buf->f_fsid.val[1] = monc->fs_cluster_id;
 115
 116         return 0;
 117 }
 118
 119 static int ceph_sync_fs(struct super_block *sb, int wait)
 120 {
 121         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 122
 123         if (!wait) {
 124                 dout("sync_fs (non-blocking)\n");
 125                 ceph_flush_dirty_caps(fsc->mdsc);
 126                 dout("sync_fs (non-blocking) done\n");
 127                 return 0;
 128         }
 129
 130         dout("sync_fs (blocking)\n");
 131         ceph_osdc_sync(&fsc->client->osdc);
 132         ceph_mdsc_sync(fsc->mdsc);
 133         dout("sync_fs (blocking) done\n");
 134         return 0;
 135 }
 136
 137 /*
 138  * mount options
 139  */
 140 enum {
 141         Opt_wsize,
 142         Opt_rsize,
 143         Opt_rasize,
 144         Opt_caps_wanted_delay_min,
 145         Opt_caps_wanted_delay_max,
 146         Opt_caps_max,
 147         Opt_readdir_max_entries,
 148         Opt_readdir_max_bytes,
 149         Opt_congestion_kb,
 150         /* int args above */
 151         Opt_snapdirname,
 152         Opt_mds_namespace,
 153         Opt_recover_session,
 154         Opt_source,
 155         Opt_mon_addr,
 156         Opt_test_dummy_encryption,
 157         /* string args above */
 158         Opt_dirstat,
 159         Opt_rbytes,
 160         Opt_asyncreaddir,
 161         Opt_dcache,
 162         Opt_ino32,
 163         Opt_fscache,
 164         Opt_poolperm,
 165         Opt_require_active_mds,
 166         Opt_acl,
 167         Opt_quotadf,
 168         Opt_copyfrom,
 169         Opt_wsync,
 170         Opt_pagecache,
 171         Opt_sparseread,
 172 };
 173
 174 enum ceph_recover_session_mode {
 175         ceph_recover_session_no,
 176         ceph_recover_session_clean
 177 };
 178
 179 static const struct constant_table ceph_param_recover[] = {
 180         { "no",         ceph_recover_session_no },
 181         { "clean",      ceph_recover_session_clean },
 182         {}
 183 };
 184
 185 static const struct fs_parameter_spec ceph_mount_parameters[] = {
 186         fsparam_flag_no ("acl",                         Opt_acl),
 187         fsparam_flag_no ("asyncreaddir",                Opt_asyncreaddir),
 188         fsparam_s32     ("caps_max",                    Opt_caps_max),
 189         fsparam_u32     ("caps_wanted_delay_max",       Opt_caps_wanted_delay_max),
 190         fsparam_u32     ("caps_wanted_delay_min",       Opt_caps_wanted_delay_min),
 191         fsparam_u32     ("write_congestion_kb",         Opt_congestion_kb),
 192         fsparam_flag_no ("copyfrom",                    Opt_copyfrom),
 193         fsparam_flag_no ("dcache",                      Opt_dcache),
 194         fsparam_flag_no ("dirstat",                     Opt_dirstat),
 195         fsparam_flag_no ("fsc",                         Opt_fscache), // fsc|nofsc
 196         fsparam_string  ("fsc",                         Opt_fscache), // fsc=...
 197         fsparam_flag_no ("ino32",                       Opt_ino32),
 198         fsparam_string  ("mds_namespace",               Opt_mds_namespace),
 199         fsparam_string  ("mon_addr",                    Opt_mon_addr),
 200         fsparam_flag_no ("poolperm",                    Opt_poolperm),
 201         fsparam_flag_no ("quotadf",                     Opt_quotadf),
 202         fsparam_u32     ("rasize",                      Opt_rasize),
 203         fsparam_flag_no ("rbytes",                      Opt_rbytes),
 204         fsparam_u32     ("readdir_max_bytes",           Opt_readdir_max_bytes),
 205         fsparam_u32     ("readdir_max_entries",         Opt_readdir_max_entries),
 206         fsparam_enum    ("recover_session",             Opt_recover_session, ceph_param_recover),
 207         fsparam_flag_no ("require_active_mds",          Opt_require_active_mds),
 208         fsparam_u32     ("rsize",                       Opt_rsize),
 209         fsparam_string  ("snapdirname",                 Opt_snapdirname),
 210         fsparam_string  ("source",                      Opt_source),
 211         fsparam_flag    ("test_dummy_encryption",       Opt_test_dummy_encryption),
 212         fsparam_string  ("test_dummy_encryption",       Opt_test_dummy_encryption),
 213         fsparam_u32     ("wsize",                       Opt_wsize),
 214         fsparam_flag_no ("wsync",                       Opt_wsync),
 215         fsparam_flag_no ("pagecache",                   Opt_pagecache),
 216         fsparam_flag_no ("sparseread",                  Opt_sparseread),
 217         {}
 218 };
 219
 220 struct ceph_parse_opts_ctx {
 221         struct ceph_options             *copts;
 222         struct ceph_mount_options       *opts;
 223 };
 224
 225 /*
 226  * Remove adjacent slashes and then the trailing slash, unless it is
 227  * the only remaining character.
 228  *
 229  * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
 230  */
 231 static void canonicalize_path(char *path)
 232 {
 233         int i, j = 0;
 234
 235         for (i = 0; path[i] != '\0'; i++) {
 236                 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
 237                         path[j++] = path[i];
 238         }
 239
 240         if (j > 1 && path[j - 1] == '/')
 241                 j--;
 242         path[j] = '\0';
 243 }
 244
 245 /*
 246  * Check if the mds namespace in ceph_mount_options matches
 247  * the passed in namespace string. First time match (when
 248  * ->mds_namespace is NULL) is treated specially, since
 249  * ->mds_namespace needs to be initialized by the caller.
 250  */
 251 static int namespace_equals(struct ceph_mount_options *fsopt,
 252                             const char *namespace, size_t len)
 253 {
 254         return !(fsopt->mds_namespace &&
 255                  (strlen(fsopt->mds_namespace) != len ||
 256                   strncmp(fsopt->mds_namespace, namespace, len)));
 257 }
 258
 259 static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
 260                                  struct fs_context *fc)
 261 {
 262         int r;
 263         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 264         struct ceph_mount_options *fsopt = pctx->opts;
 265
 266         if (*dev_name_end != ':')
 267                 return invalfc(fc, "separator ':' missing in source");
 268
 269         r = ceph_parse_mon_ips(dev_name, dev_name_end - dev_name,
 270                                pctx->copts, fc->log.log, ',');
 271         if (r)
 272                 return r;
 273
 274         fsopt->new_dev_syntax = false;
 275         return 0;
 276 }
 277
 278 static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
 279                                  struct fs_context *fc)
 280 {
 281         size_t len;
 282         struct ceph_fsid fsid;
 283         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 284         struct ceph_mount_options *fsopt = pctx->opts;
 285         char *fsid_start, *fs_name_start;
 286
 287         if (*dev_name_end != '=') {
 288                 dout("separator '=' missing in source");
 289                 return -EINVAL;
 290         }
 291
 292         fsid_start = strchr(dev_name, '@');
 293         if (!fsid_start)
 294                 return invalfc(fc, "missing cluster fsid");
 295         ++fsid_start; /* start of cluster fsid */
 296
 297         fs_name_start = strchr(fsid_start, '.');
 298         if (!fs_name_start)
 299                 return invalfc(fc, "missing file system name");
 300
 301         if (ceph_parse_fsid(fsid_start, &fsid))
 302                 return invalfc(fc, "Invalid FSID");
 303
 304         ++fs_name_start; /* start of file system name */
 305         len = dev_name_end - fs_name_start;
 306
 307         if (!namespace_equals(fsopt, fs_name_start, len))
 308                 return invalfc(fc, "Mismatching mds_namespace");
 309         kfree(fsopt->mds_namespace);
 310         fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
 311         if (!fsopt->mds_namespace)
 312                 return -ENOMEM;
 313         dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
 314
 315         fsopt->new_dev_syntax = true;
 316         return 0;
 317 }
 318
 319 /*
 320  * Parse the source parameter for new device format. Distinguish the device
 321  * spec from the path. Try parsing new device format and fallback to old
 322  * format if needed.
 323  *
 324  * New device syntax will looks like:
 325  *     <device_spec>=/<path>
 326  * where
 327  *     <device_spec> is [email protected]
 328  *     <path> is optional, but if present must begin with '/'
 329  * (monitor addresses are passed via mount option)
 330  *
 331  * Old device syntax is:
 332  *     <server_spec>[,<server_spec>...]:[<path>]
 333  * where
 334  *     <server_spec> is <ip>[:<port>]
 335  *     <path> is optional, but if present must begin with '/'
 336  */
 337 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
 338 {
 339         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 340         struct ceph_mount_options *fsopt = pctx->opts;
 341         char *dev_name = param->string, *dev_name_end;
 342         int ret;
 343
 344         dout("%s '%s'\n", __func__, dev_name);
 345         if (!dev_name || !*dev_name)
 346                 return invalfc(fc, "Empty source");
 347
 348         dev_name_end = strchr(dev_name, '/');
 349         if (dev_name_end) {
 350                 /*
 351                  * The server_path will include the whole chars from userland
 352                  * including the leading '/'.
 353                  */
 354                 kfree(fsopt->server_path);
 355                 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 356                 if (!fsopt->server_path)
 357                         return -ENOMEM;
 358
 359                 canonicalize_path(fsopt->server_path);
 360         } else {
 361                 dev_name_end = dev_name + strlen(dev_name);
 362         }
 363
 364         dev_name_end--;         /* back up to separator */
 365         if (dev_name_end < dev_name)
 366                 return invalfc(fc, "Path missing in source");
 367
 368         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 369         if (fsopt->server_path)
 370                 dout("server path '%s'\n", fsopt->server_path);
 371
 372         dout("trying new device syntax");
 373         ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
 374         if (ret) {
 375                 if (ret != -EINVAL)
 376                         return ret;
 377                 dout("trying old device syntax");
 378                 ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
 379                 if (ret)
 380                         return ret;
 381         }
 382
 383         fc->source = param->string;
 384         param->string = NULL;
 385         return 0;
 386 }
 387
 388 static int ceph_parse_mon_addr(struct fs_parameter *param,
 389                                struct fs_context *fc)
 390 {
 391         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 392         struct ceph_mount_options *fsopt = pctx->opts;
 393
 394         kfree(fsopt->mon_addr);
 395         fsopt->mon_addr = param->string;
 396         param->string = NULL;
 397
 398         return ceph_parse_mon_ips(fsopt->mon_addr, strlen(fsopt->mon_addr),
 399                                   pctx->copts, fc->log.log, '/');
 400 }
 401
 402 static int ceph_parse_mount_param(struct fs_context *fc,
 403                                   struct fs_parameter *param)
 404 {
 405         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 406         struct ceph_mount_options *fsopt = pctx->opts;
 407         struct fs_parse_result result;
 408         unsigned int mode;
 409         int token, ret;
 410
 411         ret = ceph_parse_param(param, pctx->copts, fc->log.log);
 412         if (ret != -ENOPARAM)
 413                 return ret;
 414
 415         token = fs_parse(fc, ceph_mount_parameters, param, &result);
 416         dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
 417         if (token < 0)
 418                 return token;
 419
 420         switch (token) {
 421         case Opt_snapdirname:
 422                 kfree(fsopt->snapdir_name);
 423                 fsopt->snapdir_name = param->string;
 424                 param->string = NULL;
 425                 break;
 426         case Opt_mds_namespace:
 427                 if (!namespace_equals(fsopt, param->string, strlen(param->string)))
 428                         return invalfc(fc, "Mismatching mds_namespace");
 429                 kfree(fsopt->mds_namespace);
 430                 fsopt->mds_namespace = param->string;
 431                 param->string = NULL;
 432                 break;
 433         case Opt_recover_session:
 434                 mode = result.uint_32;
 435                 if (mode == ceph_recover_session_no)
 436                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 437                 else if (mode == ceph_recover_session_clean)
 438                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 439                 else
 440                         BUG();
 441                 break;
 442         case Opt_source:
 443                 if (fc->source)
 444                         return invalfc(fc, "Multiple sources specified");
 445                 return ceph_parse_source(param, fc);
 446         case Opt_mon_addr:
 447                 return ceph_parse_mon_addr(param, fc);
 448         case Opt_wsize:
 449                 if (result.uint_32 < PAGE_SIZE ||
 450                     result.uint_32 > CEPH_MAX_WRITE_SIZE)
 451                         goto out_of_range;
 452                 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
 453                 break;
 454         case Opt_rsize:
 455                 if (result.uint_32 < PAGE_SIZE ||
 456                     result.uint_32 > CEPH_MAX_READ_SIZE)
 457                         goto out_of_range;
 458                 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
 459                 break;
 460         case Opt_rasize:
 461                 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
 462                 break;
 463         case Opt_caps_wanted_delay_min:
 464                 if (result.uint_32 < 1)
 465                         goto out_of_range;
 466                 fsopt->caps_wanted_delay_min = result.uint_32;
 467                 break;
 468         case Opt_caps_wanted_delay_max:
 469                 if (result.uint_32 < 1)
 470                         goto out_of_range;
 471                 fsopt->caps_wanted_delay_max = result.uint_32;
 472                 break;
 473         case Opt_caps_max:
 474                 if (result.int_32 < 0)
 475                         goto out_of_range;
 476                 fsopt->caps_max = result.int_32;
 477                 break;
 478         case Opt_readdir_max_entries:
 479                 if (result.uint_32 < 1)
 480                         goto out_of_range;
 481                 fsopt->max_readdir = result.uint_32;
 482                 break;
 483         case Opt_readdir_max_bytes:
 484                 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
 485                         goto out_of_range;
 486                 fsopt->max_readdir_bytes = result.uint_32;
 487                 break;
 488         case Opt_congestion_kb:
 489                 if (result.uint_32 < 1024) /* at least 1M */
 490                         goto out_of_range;
 491                 fsopt->congestion_kb = result.uint_32;
 492                 break;
 493         case Opt_dirstat:
 494                 if (!result.negated)
 495                         fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 496                 else
 497                         fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 498                 break;
 499         case Opt_rbytes:
 500                 if (!result.negated)
 501                         fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 502                 else
 503                         fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 504                 break;
 505         case Opt_asyncreaddir:
 506                 if (!result.negated)
 507                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 508                 else
 509                         fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 510                 break;
 511         case Opt_dcache:
 512                 if (!result.negated)
 513                         fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 514                 else
 515                         fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 516                 break;
 517         case Opt_ino32:
 518                 if (!result.negated)
 519                         fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 520                 else
 521                         fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 522                 break;
 523
 524         case Opt_fscache:
 525 #ifdef CONFIG_CEPH_FSCACHE
 526                 kfree(fsopt->fscache_uniq);
 527                 fsopt->fscache_uniq = NULL;
 528                 if (result.negated) {
 529                         fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 530                 } else {
 531                         fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 532                         fsopt->fscache_uniq = param->string;
 533                         param->string = NULL;
 534                 }
 535                 break;
 536 #else
 537                 return invalfc(fc, "fscache support is disabled");
 538 #endif
 539         case Opt_poolperm:
 540                 if (!result.negated)
 541                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 542                 else
 543                         fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 544                 break;
 545         case Opt_require_active_mds:
 546                 if (!result.negated)
 547                         fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 548                 else
 549                         fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 550                 break;
 551         case Opt_quotadf:
 552                 if (!result.negated)
 553                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 554                 else
 555                         fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 556                 break;
 557         case Opt_copyfrom:
 558                 if (!result.negated)
 559                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 560                 else
 561                         fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 562                 break;
 563         case Opt_acl:
 564                 if (!result.negated) {
 565 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 566                         fc->sb_flags |= SB_POSIXACL;
 567 #else
 568                         return invalfc(fc, "POSIX ACL support is disabled");
 569 #endif
 570                 } else {
 571                         fc->sb_flags &= ~SB_POSIXACL;
 572                 }
 573                 break;
 574         case Opt_wsync:
 575                 if (!result.negated)
 576                         fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
 577                 else
 578                         fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
 579                 break;
 580         case Opt_pagecache:
 581                 if (result.negated)
 582                         fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
 583                 else
 584                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
 585                 break;
 586         case Opt_sparseread:
 587                 if (result.negated)
 588                         fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD;
 589                 else
 590                         fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
 591                 break;
 592         case Opt_test_dummy_encryption:
 593 #ifdef CONFIG_FS_ENCRYPTION
 594                 fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
 595                 ret = fscrypt_parse_test_dummy_encryption(param,
 596                                                 &fsopt->dummy_enc_policy);
 597                 if (ret == -EINVAL) {
 598                         warnfc(fc, "Value of option \"%s\" is unrecognized",
 599                                param->key);
 600                 } else if (ret == -EEXIST) {
 601                         warnfc(fc, "Conflicting test_dummy_encryption options");
 602                         ret = -EINVAL;
 603                 }
 604 #else
 605                 warnfc(fc,
 606                        "FS encryption not supported: test_dummy_encryption mount option ignored");
 607 #endif
 608                 break;
 609         default:
 610                 BUG();
 611         }
 612         return 0;
 613
 614 out_of_range:
 615         return invalfc(fc, "%s out of range", param->key);
 616 }
 617
 618 static void destroy_mount_options(struct ceph_mount_options *args)
 619 {
 620         dout("destroy_mount_options %p\n", args);
 621         if (!args)
 622                 return;
 623
 624         kfree(args->snapdir_name);
 625         kfree(args->mds_namespace);
 626         kfree(args->server_path);
 627         kfree(args->fscache_uniq);
 628         kfree(args->mon_addr);
 629         fscrypt_free_dummy_policy(&args->dummy_enc_policy);
 630         kfree(args);
 631 }
 632
 633 static int strcmp_null(const char *s1, const char *s2)
 634 {
 635         if (!s1 && !s2)
 636                 return 0;
 637         if (s1 && !s2)
 638                 return -1;
 639         if (!s1 && s2)
 640                 return 1;
 641         return strcmp(s1, s2);
 642 }
 643
 644 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 645                                  struct ceph_options *new_opt,
 646                                  struct ceph_fs_client *fsc)
 647 {
 648         struct ceph_mount_options *fsopt1 = new_fsopt;
 649         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 650         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 651         int ret;
 652
 653         ret = memcmp(fsopt1, fsopt2, ofs);
 654         if (ret)
 655                 return ret;
 656
 657         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 658         if (ret)
 659                 return ret;
 660
 661         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 662         if (ret)
 663                 return ret;
 664
 665         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 666         if (ret)
 667                 return ret;
 668
 669         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 670         if (ret)
 671                 return ret;
 672
 673         ret = strcmp_null(fsopt1->mon_addr, fsopt2->mon_addr);
 674         if (ret)
 675                 return ret;
 676
 677         return ceph_compare_options(new_opt, fsc->client);
 678 }
 679
 680 /**
 681  * ceph_show_options - Show mount options in /proc/mounts
 682  * @m: seq_file to write to
 683  * @root: root of that (sub)tree
 684  */
 685 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 686 {
 687         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 688         struct ceph_mount_options *fsopt = fsc->mount_options;
 689         size_t pos;
 690         int ret;
 691
 692         /* a comma between MNT/MS and client options */
 693         seq_putc(m, ',');
 694         pos = m->count;
 695
 696         ret = ceph_print_client_options(m, fsc->client, false);
 697         if (ret)
 698                 return ret;
 699
 700         /* retract our comma if no client options */
 701         if (m->count == pos)
 702                 m->count--;
 703
 704         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 705                 seq_puts(m, ",dirstat");
 706         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 707                 seq_puts(m, ",rbytes");
 708         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 709                 seq_puts(m, ",noasyncreaddir");
 710         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 711                 seq_puts(m, ",nodcache");
 712         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 713                 seq_puts(m, ",ino32");
 714         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 715                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 716         }
 717         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 718                 seq_puts(m, ",nopoolperm");
 719         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 720                 seq_puts(m, ",noquotadf");
 721
 722 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 723         if (root->d_sb->s_flags & SB_POSIXACL)
 724                 seq_puts(m, ",acl");
 725         else
 726                 seq_puts(m, ",noacl");
 727 #endif
 728
 729         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 730                 seq_puts(m, ",copyfrom");
 731
 732         /* dump mds_namespace when old device syntax is in use */
 733         if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
 734                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 735
 736         if (fsopt->mon_addr)
 737                 seq_printf(m, ",mon_addr=%s", fsopt->mon_addr);
 738
 739         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 740                 seq_show_option(m, "recover_session", "clean");
 741
 742         if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS))
 743                 seq_puts(m, ",wsync");
 744         if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
 745                 seq_puts(m, ",nopagecache");
 746         if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
 747                 seq_puts(m, ",sparseread");
 748
 749         fscrypt_show_test_dummy_encryption(m, ',', root->d_sb);
 750
 751         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 752                 seq_printf(m, ",wsize=%u", fsopt->wsize);
 753         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 754                 seq_printf(m, ",rsize=%u", fsopt->rsize);
 755         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 756                 seq_printf(m, ",rasize=%u", fsopt->rasize);
 757         if (fsopt->congestion_kb != default_congestion_kb())
 758                 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
 759         if (fsopt->caps_max)
 760                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 761         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 762                 seq_printf(m, ",caps_wanted_delay_min=%u",
 763                          fsopt->caps_wanted_delay_min);
 764         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 765                 seq_printf(m, ",caps_wanted_delay_max=%u",
 766                            fsopt->caps_wanted_delay_max);
 767         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 768                 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
 769         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 770                 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
 771         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 772                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 773
 774         return 0;
 775 }
 776
 777 /*
 778  * handle any mon messages the standard library doesn't understand.
 779  * return error if we don't either.
 780  */
 781 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 782 {
 783         struct ceph_fs_client *fsc = client->private;
 784         int type = le16_to_cpu(msg->hdr.type);
 785
 786         switch (type) {
 787         case CEPH_MSG_MDS_MAP:
 788                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 789                 return 0;
 790         case CEPH_MSG_FS_MAP_USER:
 791                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 792                 return 0;
 793         default:
 794                 return -1;
 795         }
 796 }
 797
 798 /*
 799  * create a new fs client
 800  *
 801  * Success or not, this function consumes @fsopt and @opt.
 802  */
 803 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 804                                         struct ceph_options *opt)
 805 {
 806         struct ceph_fs_client *fsc;
 807         int err;
 808
 809         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 810         if (!fsc) {
 811                 err = -ENOMEM;
 812                 goto fail;
 813         }
 814
 815         fsc->client = ceph_create_client(opt, fsc);
 816         if (IS_ERR(fsc->client)) {
 817                 err = PTR_ERR(fsc->client);
 818                 goto fail;
 819         }
 820         opt = NULL; /* fsc->client now owns this */
 821
 822         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 823         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 824
 825         if (!fsopt->mds_namespace) {
 826                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 827                                    0, true);
 828         } else {
 829                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 830                                    0, false);
 831         }
 832
 833         fsc->mount_options = fsopt;
 834
 835         fsc->sb = NULL;
 836         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 837         fsc->filp_gen = 1;
 838         fsc->have_copy_from2 = true;
 839
 840         atomic_long_set(&fsc->writeback_count, 0);
 841         fsc->write_congested = false;
 842
 843         err = -ENOMEM;
 844         /*
 845          * The number of concurrent works can be high but they don't need
 846          * to be processed in parallel, limit concurrency.
 847          */
 848         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 849         if (!fsc->inode_wq)
 850                 goto fail_client;
 851         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 852         if (!fsc->cap_wq)
 853                 goto fail_inode_wq;
 854
 855         hash_init(fsc->async_unlink_conflict);
 856         spin_lock_init(&fsc->async_unlink_conflict_lock);
 857
 858         spin_lock(&ceph_fsc_lock);
 859         list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
 860         spin_unlock(&ceph_fsc_lock);
 861
 862         return fsc;
 863
 864 fail_inode_wq:
 865         destroy_workqueue(fsc->inode_wq);
 866 fail_client:
 867         ceph_destroy_client(fsc->client);
 868 fail:
 869         kfree(fsc);
 870         if (opt)
 871                 ceph_destroy_options(opt);
 872         destroy_mount_options(fsopt);
 873         return ERR_PTR(err);
 874 }
 875
 876 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 877 {
 878         flush_workqueue(fsc->inode_wq);
 879         flush_workqueue(fsc->cap_wq);
 880 }
 881
 882 static void destroy_fs_client(struct ceph_fs_client *fsc)
 883 {
 884         dout("destroy_fs_client %p\n", fsc);
 885
 886         spin_lock(&ceph_fsc_lock);
 887         list_del(&fsc->metric_wakeup);
 888         spin_unlock(&ceph_fsc_lock);
 889
 890         ceph_mdsc_destroy(fsc);
 891         destroy_workqueue(fsc->inode_wq);
 892         destroy_workqueue(fsc->cap_wq);
 893
 894         destroy_mount_options(fsc->mount_options);
 895
 896         ceph_destroy_client(fsc->client);
 897
 898         kfree(fsc);
 899         dout("destroy_fs_client %p done\n", fsc);
 900 }
 901
 902 /*
 903  * caches
 904  */
 905 struct kmem_cache *ceph_inode_cachep;
 906 struct kmem_cache *ceph_cap_cachep;
 907 struct kmem_cache *ceph_cap_snap_cachep;
 908 struct kmem_cache *ceph_cap_flush_cachep;
 909 struct kmem_cache *ceph_dentry_cachep;
 910 struct kmem_cache *ceph_file_cachep;
 911 struct kmem_cache *ceph_dir_file_cachep;
 912 struct kmem_cache *ceph_mds_request_cachep;
 913 mempool_t *ceph_wb_pagevec_pool;
 914
 915 static void ceph_inode_init_once(void *foo)
 916 {
 917         struct ceph_inode_info *ci = foo;
 918         inode_init_once(&ci->netfs.inode);
 919 }
 920
 921 static int __init init_caches(void)
 922 {
 923         int error = -ENOMEM;
 924
 925         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 926                                       sizeof(struct ceph_inode_info),
 927                                       __alignof__(struct ceph_inode_info),
 928                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 929                                       SLAB_ACCOUNT, ceph_inode_init_once);
 930         if (!ceph_inode_cachep)
 931                 return -ENOMEM;
 932
 933         ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 934         if (!ceph_cap_cachep)
 935                 goto bad_cap;
 936         ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, SLAB_MEM_SPREAD);
 937         if (!ceph_cap_snap_cachep)
 938                 goto bad_cap_snap;
 939         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 940                                            SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 941         if (!ceph_cap_flush_cachep)
 942                 goto bad_cap_flush;
 943
 944         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 945                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 946         if (!ceph_dentry_cachep)
 947                 goto bad_dentry;
 948
 949         ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 950         if (!ceph_file_cachep)
 951                 goto bad_file;
 952
 953         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 954         if (!ceph_dir_file_cachep)
 955                 goto bad_dir_file;
 956
 957         ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
 958         if (!ceph_mds_request_cachep)
 959                 goto bad_mds_req;
 960
 961         ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
 962         if (!ceph_wb_pagevec_pool)
 963                 goto bad_pagevec_pool;
 964
 965         return 0;
 966
 967 bad_pagevec_pool:
 968         kmem_cache_destroy(ceph_mds_request_cachep);
 969 bad_mds_req:
 970         kmem_cache_destroy(ceph_dir_file_cachep);
 971 bad_dir_file:
 972         kmem_cache_destroy(ceph_file_cachep);
 973 bad_file:
 974         kmem_cache_destroy(ceph_dentry_cachep);
 975 bad_dentry:
 976         kmem_cache_destroy(ceph_cap_flush_cachep);
 977 bad_cap_flush:
 978         kmem_cache_destroy(ceph_cap_snap_cachep);
 979 bad_cap_snap:
 980         kmem_cache_destroy(ceph_cap_cachep);
 981 bad_cap:
 982         kmem_cache_destroy(ceph_inode_cachep);
 983         return error;
 984 }
 985
 986 static void destroy_caches(void)
 987 {
 988         /*
 989          * Make sure all delayed rcu free inodes are flushed before we
 990          * destroy cache.
 991          */
 992         rcu_barrier();
 993
 994         kmem_cache_destroy(ceph_inode_cachep);
 995         kmem_cache_destroy(ceph_cap_cachep);
 996         kmem_cache_destroy(ceph_cap_snap_cachep);
 997         kmem_cache_destroy(ceph_cap_flush_cachep);
 998         kmem_cache_destroy(ceph_dentry_cachep);
 999         kmem_cache_destroy(ceph_file_cachep);
1000         kmem_cache_destroy(ceph_dir_file_cachep);
1001         kmem_cache_destroy(ceph_mds_request_cachep);
1002         mempool_destroy(ceph_wb_pagevec_pool);
1003 }
1004
1005 static void __ceph_umount_begin(struct ceph_fs_client *fsc)
1006 {
1007         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
1008         ceph_mdsc_force_umount(fsc->mdsc);
1009         fsc->filp_gen++; // invalidate open files
1010 }
1011
1012 /*
1013  * ceph_umount_begin - initiate forced umount.  Tear down the
1014  * mount, skipping steps that may hang while waiting for server(s).
1015  */
1016 void ceph_umount_begin(struct super_block *sb)
1017 {
1018         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1019
1020         dout("ceph_umount_begin - starting forced umount\n");
1021         if (!fsc)
1022                 return;
1023         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
1024         __ceph_umount_begin(fsc);
1025 }
1026
1027 static const struct super_operations ceph_super_ops = {
1028         .alloc_inode    = ceph_alloc_inode,
1029         .free_inode     = ceph_free_inode,
1030         .write_inode    = ceph_write_inode,
1031         .drop_inode     = generic_delete_inode,
1032         .evict_inode    = ceph_evict_inode,
1033         .sync_fs        = ceph_sync_fs,
1034         .put_super      = ceph_put_super,
1035         .show_options   = ceph_show_options,
1036         .statfs         = ceph_statfs,
1037         .umount_begin   = ceph_umount_begin,
1038 };
1039
1040 /*
1041  * Bootstrap mount by opening the root directory.  Note the mount
1042  * @started time from caller, and time out if this takes too long.
1043  */
1044 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
1045                                        const char *path,
1046                                        unsigned long started)
1047 {
1048         struct ceph_mds_client *mdsc = fsc->mdsc;
1049         struct ceph_mds_request *req = NULL;
1050         int err;
1051         struct dentry *root;
1052
1053         /* open dir */
1054         dout("open_root_inode opening '%s'\n", path);
1055         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1056         if (IS_ERR(req))
1057                 return ERR_CAST(req);
1058         req->r_path1 = kstrdup(path, GFP_NOFS);
1059         if (!req->r_path1) {
1060                 root = ERR_PTR(-ENOMEM);
1061                 goto out;
1062         }
1063
1064         req->r_ino1.ino = CEPH_INO_ROOT;
1065         req->r_ino1.snap = CEPH_NOSNAP;
1066         req->r_started = started;
1067         req->r_timeout = fsc->client->options->mount_timeout;
1068         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
1069         req->r_num_caps = 2;
1070         err = ceph_mdsc_do_request(mdsc, NULL, req);
1071         if (err == 0) {
1072                 struct inode *inode = req->r_target_inode;
1073                 req->r_target_inode = NULL;
1074                 dout("open_root_inode success\n");
1075                 root = d_make_root(inode);
1076                 if (!root) {
1077                         root = ERR_PTR(-ENOMEM);
1078                         goto out;
1079                 }
1080                 dout("open_root_inode success, root dentry is %p\n", root);
1081         } else {
1082                 root = ERR_PTR(err);
1083         }
1084 out:
1085         ceph_mdsc_put_request(req);
1086         return root;
1087 }
1088
1089 #ifdef CONFIG_FS_ENCRYPTION
1090 static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1091                                             struct fs_context *fc,
1092                                             struct ceph_mount_options *fsopt)
1093 {
1094         struct ceph_fs_client *fsc = sb->s_fs_info;
1095
1096         if (!fscrypt_is_dummy_policy_set(&fsopt->dummy_enc_policy))
1097                 return 0;
1098
1099         /* No changing encryption context on remount. */
1100         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
1101             !fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1102                 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1103                                                  &fsc->fsc_dummy_enc_policy))
1104                         return 0;
1105                 errorfc(fc, "Can't set test_dummy_encryption on remount");
1106                 return -EINVAL;
1107         }
1108
1109         /* Also make sure fsopt doesn't contain a conflicting value. */
1110         if (fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1111                 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1112                                                  &fsc->fsc_dummy_enc_policy))
1113                         return 0;
1114                 errorfc(fc, "Conflicting test_dummy_encryption options");
1115                 return -EINVAL;
1116         }
1117
1118         fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
1119         memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
1120
1121         warnfc(fc, "test_dummy_encryption mode enabled");
1122         return 0;
1123 }
1124 #else
1125 static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1126                                             struct fs_context *fc,
1127                                             struct ceph_mount_options *fsopt)
1128 {
1129         return 0;
1130 }
1131 #endif
1132
1133 /*
1134  * mount: join the ceph cluster, and open root directory.
1135  */
1136 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
1137                                       struct fs_context *fc)
1138 {
1139         int err;
1140         unsigned long started = jiffies;  /* note the start time */
1141         struct dentry *root;
1142
1143         dout("mount start %p\n", fsc);
1144         mutex_lock(&fsc->client->mount_mutex);
1145
1146         if (!fsc->sb->s_root) {
1147                 const char *path = fsc->mount_options->server_path ?
1148                                      fsc->mount_options->server_path + 1 : "";
1149
1150                 err = __ceph_open_session(fsc->client, started);
1151                 if (err < 0)
1152                         goto out;
1153
1154                 /* setup fscache */
1155                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
1156                         err = ceph_fscache_register_fs(fsc, fc);
1157                         if (err < 0)
1158                                 goto out;
1159                 }
1160
1161                 err = ceph_apply_test_dummy_encryption(fsc->sb, fc,
1162                                                        fsc->mount_options);
1163                 if (err)
1164                         goto out;
1165
1166                 dout("mount opening path '%s'\n", path);
1167
1168                 ceph_fs_debugfs_init(fsc);
1169
1170                 root = open_root_dentry(fsc, path, started);
1171                 if (IS_ERR(root)) {
1172                         err = PTR_ERR(root);
1173                         goto out;
1174                 }
1175                 fsc->sb->s_root = dget(root);
1176         } else {
1177                 root = dget(fsc->sb->s_root);
1178         }
1179
1180         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1181         dout("mount success\n");
1182         mutex_unlock(&fsc->client->mount_mutex);
1183         return root;
1184
1185 out:
1186         mutex_unlock(&fsc->client->mount_mutex);
1187         ceph_fscrypt_free_dummy_policy(fsc);
1188         return ERR_PTR(err);
1189 }
1190
1191 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1192 {
1193         struct ceph_fs_client *fsc = s->s_fs_info;
1194         int ret;
1195
1196         dout("set_super %p\n", s);
1197
1198         s->s_maxbytes = MAX_LFS_FILESIZE;
1199
1200         s->s_xattr = ceph_xattr_handlers;
1201         fsc->sb = s;
1202         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1203
1204         s->s_op = &ceph_super_ops;
1205         s->s_d_op = &ceph_dentry_ops;
1206         s->s_export_op = &ceph_export_ops;
1207
1208         s->s_time_gran = 1;
1209         s->s_time_min = 0;
1210         s->s_time_max = U32_MAX;
1211         s->s_flags |= SB_NODIRATIME | SB_NOATIME;
1212
1213         ceph_fscrypt_set_ops(s);
1214
1215         ret = set_anon_super_fc(s, fc);
1216         if (ret != 0)
1217                 fsc->sb = NULL;
1218         return ret;
1219 }
1220
1221 /*
1222  * share superblock if same fs AND options
1223  */
1224 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1225 {
1226         struct ceph_fs_client *new = fc->s_fs_info;
1227         struct ceph_mount_options *fsopt = new->mount_options;
1228         struct ceph_options *opt = new->client->options;
1229         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1230
1231         dout("ceph_compare_super %p\n", sb);
1232
1233         if (compare_mount_options(fsopt, opt, fsc)) {
1234                 dout("monitor(s)/mount options don't match\n");
1235                 return 0;
1236         }
1237         if ((opt->flags & CEPH_OPT_FSID) &&
1238             ceph_fsid_compare(&opt->fsid, &fsc->client->fsid)) {
1239                 dout("fsid doesn't match\n");
1240                 return 0;
1241         }
1242         if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1243                 dout("flags differ\n");
1244                 return 0;
1245         }
1246
1247         if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
1248                 dout("client is blocklisted (and CLEANRECOVER is not set)\n");
1249                 return 0;
1250         }
1251
1252         if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
1253                 dout("client has been forcibly unmounted\n");
1254                 return 0;
1255         }
1256
1257         return 1;
1258 }
1259
1260 /*
1261  * construct our own bdi so we can control readahead, etc.
1262  */
1263 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1264
1265 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1266 {
1267         int err;
1268
1269         err = super_setup_bdi_name(sb, "ceph-%ld",
1270                                    atomic_long_inc_return(&bdi_seq));
1271         if (err)
1272                 return err;
1273
1274         /* set ra_pages based on rasize mount option? */
1275         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1276
1277         /* set io_pages based on max osd read size */
1278         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1279
1280         return 0;
1281 }
1282
1283 static int ceph_get_tree(struct fs_context *fc)
1284 {
1285         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1286         struct ceph_mount_options *fsopt = pctx->opts;
1287         struct super_block *sb;
1288         struct ceph_fs_client *fsc;
1289         struct dentry *res;
1290         int (*compare_super)(struct super_block *, struct fs_context *) =
1291                 ceph_compare_super;
1292         int err;
1293
1294         dout("ceph_get_tree\n");
1295
1296         if (!fc->source)
1297                 return invalfc(fc, "No source");
1298         if (fsopt->new_dev_syntax && !fsopt->mon_addr)
1299                 return invalfc(fc, "No monitor address");
1300
1301         /* create client (which we may/may not use) */
1302         fsc = create_fs_client(pctx->opts, pctx->copts);
1303         pctx->opts = NULL;
1304         pctx->copts = NULL;
1305         if (IS_ERR(fsc)) {
1306                 err = PTR_ERR(fsc);
1307                 goto out_final;
1308         }
1309
1310         err = ceph_mdsc_init(fsc);
1311         if (err < 0)
1312                 goto out;
1313
1314         if (ceph_test_opt(fsc->client, NOSHARE))
1315                 compare_super = NULL;
1316
1317         fc->s_fs_info = fsc;
1318         sb = sget_fc(fc, compare_super, ceph_set_super);
1319         fc->s_fs_info = NULL;
1320         if (IS_ERR(sb)) {
1321                 err = PTR_ERR(sb);
1322                 goto out;
1323         }
1324
1325         if (ceph_sb_to_client(sb) != fsc) {
1326                 destroy_fs_client(fsc);
1327                 fsc = ceph_sb_to_client(sb);
1328                 dout("get_sb got existing client %p\n", fsc);
1329         } else {
1330                 dout("get_sb using new client %p\n", fsc);
1331                 err = ceph_setup_bdi(sb, fsc);
1332                 if (err < 0)
1333                         goto out_splat;
1334         }
1335
1336         res = ceph_real_mount(fsc, fc);
1337         if (IS_ERR(res)) {
1338                 err = PTR_ERR(res);
1339                 goto out_splat;
1340         }
1341         dout("root %p inode %p ino %llx.%llx\n", res,
1342              d_inode(res), ceph_vinop(d_inode(res)));
1343         fc->root = fsc->sb->s_root;
1344         return 0;
1345
1346 out_splat:
1347         if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1348                 pr_info("No mds server is up or the cluster is laggy\n");
1349                 err = -EHOSTUNREACH;
1350         }
1351
1352         ceph_mdsc_close_sessions(fsc->mdsc);
1353         deactivate_locked_super(sb);
1354         goto out_final;
1355
1356 out:
1357         destroy_fs_client(fsc);
1358 out_final:
1359         dout("ceph_get_tree fail %d\n", err);
1360         return err;
1361 }
1362
1363 static void ceph_free_fc(struct fs_context *fc)
1364 {
1365         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1366
1367         if (pctx) {
1368                 destroy_mount_options(pctx->opts);
1369                 ceph_destroy_options(pctx->copts);
1370                 kfree(pctx);
1371         }
1372 }
1373
1374 static int ceph_reconfigure_fc(struct fs_context *fc)
1375 {
1376         int err;
1377         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1378         struct ceph_mount_options *fsopt = pctx->opts;
1379         struct super_block *sb = fc->root->d_sb;
1380         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1381
1382         err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
1383         if (err)
1384                 return err;
1385
1386         if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1387                 ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1388         else
1389                 ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1390
1391         if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
1392                 ceph_set_mount_opt(fsc, SPARSEREAD);
1393         else
1394                 ceph_clear_mount_opt(fsc, SPARSEREAD);
1395
1396         if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
1397                 kfree(fsc->mount_options->mon_addr);
1398                 fsc->mount_options->mon_addr = fsopt->mon_addr;
1399                 fsopt->mon_addr = NULL;
1400                 pr_notice("ceph: monitor addresses recorded, but not used for reconnection");
1401         }
1402
1403         sync_filesystem(sb);
1404         return 0;
1405 }
1406
1407 static const struct fs_context_operations ceph_context_ops = {
1408         .free           = ceph_free_fc,
1409         .parse_param    = ceph_parse_mount_param,
1410         .get_tree       = ceph_get_tree,
1411         .reconfigure    = ceph_reconfigure_fc,
1412 };
1413
1414 /*
1415  * Set up the filesystem mount context.
1416  */
1417 static int ceph_init_fs_context(struct fs_context *fc)
1418 {
1419         struct ceph_parse_opts_ctx *pctx;
1420         struct ceph_mount_options *fsopt;
1421
1422         pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1423         if (!pctx)
1424                 return -ENOMEM;
1425
1426         pctx->copts = ceph_alloc_options();
1427         if (!pctx->copts)
1428                 goto nomem;
1429
1430         pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1431         if (!pctx->opts)
1432                 goto nomem;
1433
1434         fsopt = pctx->opts;
1435         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1436
1437         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1438         fsopt->rsize = CEPH_MAX_READ_SIZE;
1439         fsopt->rasize = CEPH_RASIZE_DEFAULT;
1440         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1441         if (!fsopt->snapdir_name)
1442                 goto nomem;
1443
1444         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1445         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1446         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1447         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1448         fsopt->congestion_kb = default_congestion_kb();
1449
1450 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1451         fc->sb_flags |= SB_POSIXACL;
1452 #endif
1453
1454         fc->fs_private = pctx;
1455         fc->ops = &ceph_context_ops;
1456         return 0;
1457
1458 nomem:
1459         destroy_mount_options(pctx->opts);
1460         ceph_destroy_options(pctx->copts);
1461         kfree(pctx);
1462         return -ENOMEM;
1463 }
1464
1465 /*
1466  * Return true if it successfully increases the blocker counter,
1467  * or false if the mdsc is in stopping and flushed state.
1468  */
1469 static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc)
1470 {
1471         spin_lock(&mdsc->stopping_lock);
1472         if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING) {
1473                 spin_unlock(&mdsc->stopping_lock);
1474                 return false;
1475         }
1476         atomic_inc(&mdsc->stopping_blockers);
1477         spin_unlock(&mdsc->stopping_lock);
1478         return true;
1479 }
1480
1481 static void __dec_stopping_blocker(struct ceph_mds_client *mdsc)
1482 {
1483         spin_lock(&mdsc->stopping_lock);
1484         if (!atomic_dec_return(&mdsc->stopping_blockers) &&
1485             mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING)
1486                 complete_all(&mdsc->stopping_waiter);
1487         spin_unlock(&mdsc->stopping_lock);
1488 }
1489
1490 /* For metadata IO requests */
1491 bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
1492                                    struct ceph_mds_session *session)
1493 {
1494         mutex_lock(&session->s_mutex);
1495         inc_session_sequence(session);
1496         mutex_unlock(&session->s_mutex);
1497
1498         return __inc_stopping_blocker(mdsc);
1499 }
1500
1501 void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc)
1502 {
1503         __dec_stopping_blocker(mdsc);
1504 }
1505
1506 /* For data IO requests */
1507 bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1508 {
1509         return __inc_stopping_blocker(mdsc);
1510 }
1511
1512 void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1513 {
1514         __dec_stopping_blocker(mdsc);
1515 }
1516
1517 static void ceph_kill_sb(struct super_block *s)
1518 {
1519         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1520         struct ceph_mds_client *mdsc = fsc->mdsc;
1521         bool wait;
1522
1523         dout("kill_sb %p\n", s);
1524
1525         ceph_mdsc_pre_umount(mdsc);
1526         flush_fs_workqueues(fsc);
1527
1528         /*
1529          * Though the kill_anon_super() will finally trigger the
1530          * sync_filesystem() anyway, we still need to do it here and
1531          * then bump the stage of shutdown. This will allow us to
1532          * drop any further message, which will increase the inodes'
1533          * i_count reference counters but makes no sense any more,
1534          * from MDSs.
1535          *
1536          * Without this when evicting the inodes it may fail in the
1537          * kill_anon_super(), which will trigger a warning when
1538          * destroying the fscrypt keyring and then possibly trigger
1539          * a further crash in ceph module when the iput() tries to
1540          * evict the inodes later.
1541          */
1542         sync_filesystem(s);
1543
1544         spin_lock(&mdsc->stopping_lock);
1545         mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHING;
1546         wait = !!atomic_read(&mdsc->stopping_blockers);
1547         spin_unlock(&mdsc->stopping_lock);
1548
1549         if (wait && atomic_read(&mdsc->stopping_blockers)) {
1550                 long timeleft = wait_for_completion_killable_timeout(
1551                                         &mdsc->stopping_waiter,
1552                                         fsc->client->options->mount_timeout);
1553                 if (!timeleft) /* timed out */
1554                         pr_warn("umount timed out, %ld\n", timeleft);
1555                 else if (timeleft < 0) /* killed */
1556                         pr_warn("umount was killed, %ld\n", timeleft);
1557         }
1558
1559         mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED;
1560         kill_anon_super(s);
1561
1562         fsc->client->extra_mon_dispatch = NULL;
1563         ceph_fs_debugfs_cleanup(fsc);
1564
1565         ceph_fscache_unregister_fs(fsc);
1566
1567         destroy_fs_client(fsc);
1568 }
1569
1570 static struct file_system_type ceph_fs_type = {
1571         .owner          = THIS_MODULE,
1572         .name           = "ceph",
1573         .init_fs_context = ceph_init_fs_context,
1574         .kill_sb        = ceph_kill_sb,
1575         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1576 };
1577 MODULE_ALIAS_FS("ceph");
1578
1579 int ceph_force_reconnect(struct super_block *sb)
1580 {
1581         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1582         int err = 0;
1583
1584         fsc->mount_state = CEPH_MOUNT_RECOVER;
1585         __ceph_umount_begin(fsc);
1586
1587         /* Make sure all page caches get invalidated.
1588          * see remove_session_caps_cb() */
1589         flush_workqueue(fsc->inode_wq);
1590
1591         /* In case that we were blocklisted. This also reset
1592          * all mon/osd connections */
1593         ceph_reset_client_addr(fsc->client);
1594
1595         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1596
1597         fsc->blocklisted = false;
1598         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1599
1600         if (sb->s_root) {
1601                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1602                                         CEPH_STAT_CAP_INODE, true);
1603         }
1604         return err;
1605 }
1606
1607 static int __init init_ceph(void)
1608 {
1609         int ret = init_caches();
1610         if (ret)
1611                 goto out;
1612
1613         ceph_flock_init();
1614         ret = register_filesystem(&ceph_fs_type);
1615         if (ret)
1616                 goto out_caches;
1617
1618         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1619
1620         return 0;
1621
1622 out_caches:
1623         destroy_caches();
1624 out:
1625         return ret;
1626 }
1627
1628 static void __exit exit_ceph(void)
1629 {
1630         dout("exit_ceph\n");
1631         unregister_filesystem(&ceph_fs_type);
1632         destroy_caches();
1633 }
1634
1635 static int param_set_metrics(const char *val, const struct kernel_param *kp)
1636 {
1637         struct ceph_fs_client *fsc;
1638         int ret;
1639
1640         ret = param_set_bool(val, kp);
1641         if (ret) {
1642                 pr_err("Failed to parse sending metrics switch value '%s'\n",
1643                        val);
1644                 return ret;
1645         } else if (!disable_send_metrics) {
1646                 // wake up all the mds clients
1647                 spin_lock(&ceph_fsc_lock);
1648                 list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1649                         metric_schedule_delayed(&fsc->mdsc->metric);
1650                 }
1651                 spin_unlock(&ceph_fsc_lock);
1652         }
1653
1654         return 0;
1655 }
1656
1657 static const struct kernel_param_ops param_ops_metrics = {
1658         .set = param_set_metrics,
1659         .get = param_get_bool,
1660 };
1661
1662 bool disable_send_metrics = false;
1663 module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
1664 MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1665
1666 /* for both v1 and v2 syntax */
1667 static bool mount_support = true;
1668 static const struct kernel_param_ops param_ops_mount_syntax = {
1669         .get = param_get_bool,
1670 };
1671 module_param_cb(mount_syntax_v1, &param_ops_mount_syntax, &mount_support, 0444);
1672 module_param_cb(mount_syntax_v2, &param_ops_mount_syntax, &mount_support, 0444);
1673
1674 module_init(init_ceph);
1675 module_exit(exit_ceph);
1676
1677 MODULE_AUTHOR("Sage Weil <[email protected]>");
1678 MODULE_AUTHOR("Yehuda Sadeh <[email protected]>");
1679 MODULE_AUTHOR("Patience Warnick <[email protected]>");
1680 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1681 MODULE_LICENSE("GPL");