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_fs_client(s);
  48
  49         doutc(fsc->client, "begin\n");
  50         ceph_fscrypt_free_dummy_policy(fsc);
  51         ceph_mdsc_close_sessions(fsc->mdsc);
  52         doutc(fsc->client, "done\n");
  53 }
  54
  55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  56 {
  57         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(d_inode(dentry));
  58         struct ceph_mon_client *monc = &fsc->client->monc;
  59         struct ceph_statfs st;
  60         int i, err;
  61         u64 data_pool;
  62
  63         doutc(fsc->client, "begin\n");
  64         if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  65                 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  66         } else {
  67                 data_pool = CEPH_NOPOOL;
  68         }
  69
  70         err = ceph_monc_do_statfs(monc, data_pool, &st);
  71         if (err < 0)
  72                 return err;
  73
  74         /* fill in kstatfs */
  75         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  76
  77         /*
  78          * Express utilization in terms of large blocks to avoid
  79          * overflow on 32-bit machines.
  80          */
  81         buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  82
  83         /*
  84          * By default use root quota for stats; fallback to overall filesystem
  85          * usage if using 'noquotadf' mount option or if the root dir doesn't
  86          * have max_bytes quota set.
  87          */
  88         if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  89             !ceph_quota_update_statfs(fsc, buf)) {
  90                 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  91                 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  92                 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  93         }
  94
  95         /*
  96          * NOTE: for the time being, we make bsize == frsize to humor
  97          * not-yet-ancient versions of glibc that are broken.
  98          * Someday, we will probably want to report a real block
  99          * size...  whatever that may mean for a network file system!
 100          */
 101         buf->f_bsize = buf->f_frsize;
 102
 103         buf->f_files = le64_to_cpu(st.num_objects);
 104         buf->f_ffree = -1;
 105         buf->f_namelen = NAME_MAX;
 106
 107         /* Must convert the fsid, for consistent values across arches */
 108         buf->f_fsid.val[0] = 0;
 109         mutex_lock(&monc->mutex);
 110         for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
 111                 buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
 112         mutex_unlock(&monc->mutex);
 113
 114         /* fold the fs_cluster_id into the upper bits */
 115         buf->f_fsid.val[1] = monc->fs_cluster_id;
 116
 117         doutc(fsc->client, "done\n");
 118         return 0;
 119 }
 120
 121 static int ceph_sync_fs(struct super_block *sb, int wait)
 122 {
 123         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
 124         struct ceph_client *cl = fsc->client;
 125
 126         if (!wait) {
 127                 doutc(cl, "(non-blocking)\n");
 128                 ceph_flush_dirty_caps(fsc->mdsc);
 129                 doutc(cl, "(non-blocking) done\n");
 130                 return 0;
 131         }
 132
 133         doutc(cl, "(blocking)\n");
 134         ceph_osdc_sync(&fsc->client->osdc);
 135         ceph_mdsc_sync(fsc->mdsc);
 136         doutc(cl, "(blocking) done\n");
 137         return 0;
 138 }
 139
 140 /*
 141  * mount options
 142  */
 143 enum {
 144         Opt_wsize,
 145         Opt_rsize,
 146         Opt_rasize,
 147         Opt_caps_wanted_delay_min,
 148         Opt_caps_wanted_delay_max,
 149         Opt_caps_max,
 150         Opt_readdir_max_entries,
 151         Opt_readdir_max_bytes,
 152         Opt_congestion_kb,
 153         /* int args above */
 154         Opt_snapdirname,
 155         Opt_mds_namespace,
 156         Opt_recover_session,
 157         Opt_source,
 158         Opt_mon_addr,
 159         Opt_test_dummy_encryption,
 160         /* string args above */
 161         Opt_dirstat,
 162         Opt_rbytes,
 163         Opt_asyncreaddir,
 164         Opt_dcache,
 165         Opt_ino32,
 166         Opt_fscache,
 167         Opt_poolperm,
 168         Opt_require_active_mds,
 169         Opt_acl,
 170         Opt_quotadf,
 171         Opt_copyfrom,
 172         Opt_wsync,
 173         Opt_pagecache,
 174         Opt_sparseread,
 175 };
 176
 177 enum ceph_recover_session_mode {
 178         ceph_recover_session_no,
 179         ceph_recover_session_clean
 180 };
 181
 182 static const struct constant_table ceph_param_recover[] = {
 183         { "no",         ceph_recover_session_no },
 184         { "clean",      ceph_recover_session_clean },
 185         {}
 186 };
 187
 188 static const struct fs_parameter_spec ceph_mount_parameters[] = {
 189         fsparam_flag_no ("acl",                         Opt_acl),
 190         fsparam_flag_no ("asyncreaddir",                Opt_asyncreaddir),
 191         fsparam_s32     ("caps_max",                    Opt_caps_max),
 192         fsparam_u32     ("caps_wanted_delay_max",       Opt_caps_wanted_delay_max),
 193         fsparam_u32     ("caps_wanted_delay_min",       Opt_caps_wanted_delay_min),
 194         fsparam_u32     ("write_congestion_kb",         Opt_congestion_kb),
 195         fsparam_flag_no ("copyfrom",                    Opt_copyfrom),
 196         fsparam_flag_no ("dcache",                      Opt_dcache),
 197         fsparam_flag_no ("dirstat",                     Opt_dirstat),
 198         fsparam_flag_no ("fsc",                         Opt_fscache), // fsc|nofsc
 199         fsparam_string  ("fsc",                         Opt_fscache), // fsc=...
 200         fsparam_flag_no ("ino32",                       Opt_ino32),
 201         fsparam_string  ("mds_namespace",               Opt_mds_namespace),
 202         fsparam_string  ("mon_addr",                    Opt_mon_addr),
 203         fsparam_flag_no ("poolperm",                    Opt_poolperm),
 204         fsparam_flag_no ("quotadf",                     Opt_quotadf),
 205         fsparam_u32     ("rasize",                      Opt_rasize),
 206         fsparam_flag_no ("rbytes",                      Opt_rbytes),
 207         fsparam_u32     ("readdir_max_bytes",           Opt_readdir_max_bytes),
 208         fsparam_u32     ("readdir_max_entries",         Opt_readdir_max_entries),
 209         fsparam_enum    ("recover_session",             Opt_recover_session, ceph_param_recover),
 210         fsparam_flag_no ("require_active_mds",          Opt_require_active_mds),
 211         fsparam_u32     ("rsize",                       Opt_rsize),
 212         fsparam_string  ("snapdirname",                 Opt_snapdirname),
 213         fsparam_string  ("source",                      Opt_source),
 214         fsparam_flag    ("test_dummy_encryption",       Opt_test_dummy_encryption),
 215         fsparam_string  ("test_dummy_encryption",       Opt_test_dummy_encryption),
 216         fsparam_u32     ("wsize",                       Opt_wsize),
 217         fsparam_flag_no ("wsync",                       Opt_wsync),
 218         fsparam_flag_no ("pagecache",                   Opt_pagecache),
 219         fsparam_flag_no ("sparseread",                  Opt_sparseread),
 220         {}
 221 };
 222
 223 struct ceph_parse_opts_ctx {
 224         struct ceph_options             *copts;
 225         struct ceph_mount_options       *opts;
 226 };
 227
 228 /*
 229  * Remove adjacent slashes and then the trailing slash, unless it is
 230  * the only remaining character.
 231  *
 232  * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
 233  */
 234 static void canonicalize_path(char *path)
 235 {
 236         int i, j = 0;
 237
 238         for (i = 0; path[i] != '\0'; i++) {
 239                 if (path[i] != '/' || j < 1 || path[j - 1] != '/')
 240                         path[j++] = path[i];
 241         }
 242
 243         if (j > 1 && path[j - 1] == '/')
 244                 j--;
 245         path[j] = '\0';
 246 }
 247
 248 /*
 249  * Check if the mds namespace in ceph_mount_options matches
 250  * the passed in namespace string. First time match (when
 251  * ->mds_namespace is NULL) is treated specially, since
 252  * ->mds_namespace needs to be initialized by the caller.
 253  */
 254 static int namespace_equals(struct ceph_mount_options *fsopt,
 255                             const char *namespace, size_t len)
 256 {
 257         return !(fsopt->mds_namespace &&
 258                  (strlen(fsopt->mds_namespace) != len ||
 259                   strncmp(fsopt->mds_namespace, namespace, len)));
 260 }
 261
 262 static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
 263                                  struct fs_context *fc)
 264 {
 265         int r;
 266         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 267         struct ceph_mount_options *fsopt = pctx->opts;
 268
 269         if (*dev_name_end != ':')
 270                 return invalfc(fc, "separator ':' missing in source");
 271
 272         r = ceph_parse_mon_ips(dev_name, dev_name_end - dev_name,
 273                                pctx->copts, fc->log.log, ',');
 274         if (r)
 275                 return r;
 276
 277         fsopt->new_dev_syntax = false;
 278         return 0;
 279 }
 280
 281 static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
 282                                  struct fs_context *fc)
 283 {
 284         size_t len;
 285         struct ceph_fsid fsid;
 286         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 287         struct ceph_mount_options *fsopt = pctx->opts;
 288         char *fsid_start, *fs_name_start;
 289
 290         if (*dev_name_end != '=') {
 291                 dout("separator '=' missing in source");
 292                 return -EINVAL;
 293         }
 294
 295         fsid_start = strchr(dev_name, '@');
 296         if (!fsid_start)
 297                 return invalfc(fc, "missing cluster fsid");
 298         ++fsid_start; /* start of cluster fsid */
 299
 300         fs_name_start = strchr(fsid_start, '.');
 301         if (!fs_name_start)
 302                 return invalfc(fc, "missing file system name");
 303
 304         if (ceph_parse_fsid(fsid_start, &fsid))
 305                 return invalfc(fc, "Invalid FSID");
 306
 307         ++fs_name_start; /* start of file system name */
 308         len = dev_name_end - fs_name_start;
 309
 310         if (!namespace_equals(fsopt, fs_name_start, len))
 311                 return invalfc(fc, "Mismatching mds_namespace");
 312         kfree(fsopt->mds_namespace);
 313         fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
 314         if (!fsopt->mds_namespace)
 315                 return -ENOMEM;
 316         dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
 317
 318         fsopt->new_dev_syntax = true;
 319         return 0;
 320 }
 321
 322 /*
 323  * Parse the source parameter for new device format. Distinguish the device
 324  * spec from the path. Try parsing new device format and fallback to old
 325  * format if needed.
 326  *
 327  * New device syntax will looks like:
 328  *     <device_spec>=/<path>
 329  * where
 330  *     <device_spec> is name@fsid.fsname
 331  *     <path> is optional, but if present must begin with '/'
 332  * (monitor addresses are passed via mount option)
 333  *
 334  * Old device syntax is:
 335  *     <server_spec>[,<server_spec>...]:[<path>]
 336  * where
 337  *     <server_spec> is <ip>[:<port>]
 338  *     <path> is optional, but if present must begin with '/'
 339  */
 340 static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
 341 {
 342         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 343         struct ceph_mount_options *fsopt = pctx->opts;
 344         char *dev_name = param->string, *dev_name_end;
 345         int ret;
 346
 347         dout("'%s'\n", dev_name);
 348         if (!dev_name || !*dev_name)
 349                 return invalfc(fc, "Empty source");
 350
 351         dev_name_end = strchr(dev_name, '/');
 352         if (dev_name_end) {
 353                 /*
 354                  * The server_path will include the whole chars from userland
 355                  * including the leading '/'.
 356                  */
 357                 kfree(fsopt->server_path);
 358                 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 359                 if (!fsopt->server_path)
 360                         return -ENOMEM;
 361
 362                 canonicalize_path(fsopt->server_path);
 363         } else {
 364                 dev_name_end = dev_name + strlen(dev_name);
 365         }
 366
 367         dev_name_end--;         /* back up to separator */
 368         if (dev_name_end < dev_name)
 369                 return invalfc(fc, "Path missing in source");
 370
 371         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 372         if (fsopt->server_path)
 373                 dout("server path '%s'\n", fsopt->server_path);
 374
 375         dout("trying new device syntax");
 376         ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
 377         if (ret) {
 378                 if (ret != -EINVAL)
 379                         return ret;
 380                 dout("trying old device syntax");
 381                 ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
 382                 if (ret)
 383                         return ret;
 384         }
 385
 386         fc->source = param->string;
 387         param->string = NULL;
 388         return 0;
 389 }
 390
 391 static int ceph_parse_mon_addr(struct fs_parameter *param,
 392                                struct fs_context *fc)
 393 {
 394         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 395         struct ceph_mount_options *fsopt = pctx->opts;
 396
 397         kfree(fsopt->mon_addr);
 398         fsopt->mon_addr = param->string;
 399         param->string = NULL;
 400
 401         return ceph_parse_mon_ips(fsopt->mon_addr, strlen(fsopt->mon_addr),
 402                                   pctx->copts, fc->log.log, '/');
 403 }
 404
 405 static int ceph_parse_mount_param(struct fs_context *fc,
 406                                   struct fs_parameter *param)
 407 {
 408         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 409         struct ceph_mount_options *fsopt = pctx->opts;
 410         struct fs_parse_result result;
 411         unsigned int mode;
 412         int token, ret;
 413
 414         ret = ceph_parse_param(param, pctx->copts, fc->log.log);
 415         if (ret != -ENOPARAM)
 416                 return ret;
 417
 418         token = fs_parse(fc, ceph_mount_parameters, param, &result);
 419         dout("%s: fs_parse '%s' token %d\n",__func__, param->key, token);
 420         if (token < 0)
 421                 return token;
 422
 423         switch (token) {
 424         case Opt_snapdirname:
 425                 kfree(fsopt->snapdir_name);
 426                 fsopt->snapdir_name = param->string;
 427                 param->string = NULL;
 428                 break;
 429         case Opt_mds_namespace:
 430                 if (!namespace_equals(fsopt, param->string, strlen(param->string)))
 431                         return invalfc(fc, "Mismatching mds_namespace");
 432                 kfree(fsopt->mds_namespace);
 433                 fsopt->mds_namespace = param->string;
 434                 param->string = NULL;
 435                 break;
 436         case Opt_recover_session:
 437                 mode = result.uint_32;
 438                 if (mode == ceph_recover_session_no)
 439                         fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 440                 else if (mode == ceph_recover_session_clean)
 441                         fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 442                 else
 443                         BUG();
 444                 break;
 445         case Opt_source:
 446                 if (fc->source)
 447                         return invalfc(fc, "Multiple sources specified");
 448                 return ceph_parse_source(param, fc);
 449         case Opt_mon_addr:
 450                 return ceph_parse_mon_addr(param, fc);
 451         case Opt_wsize:
 452                 if (result.uint_32 < PAGE_SIZE ||
 453                     result.uint_32 > CEPH_MAX_WRITE_SIZE)
 454                         goto out_of_range;
 455                 fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
 456                 break;
 457         case Opt_rsize:
 458                 if (result.uint_32 < PAGE_SIZE ||
 459                     result.uint_32 > CEPH_MAX_READ_SIZE)
 460                         goto out_of_range;
 461                 fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
 462                 break;
 463         case Opt_rasize:
 464                 fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
 465                 break;
 466         case Opt_caps_wanted_delay_min:
 467                 if (result.uint_32 < 1)
 468                         goto out_of_range;
 469                 fsopt->caps_wanted_delay_min = result.uint_32;
 470                 break;
 471         case Opt_caps_wanted_delay_max:
 472                 if (result.uint_32 < 1)
 473                         goto out_of_range;
 474                 fsopt->caps_wanted_delay_max = result.uint_32;
 475                 break;
 476         case Opt_caps_max:
 477                 if (result.int_32 < 0)
 478                         goto out_of_range;
 479                 fsopt->caps_max = result.int_32;
 480                 break;
 481         case Opt_readdir_max_entries:
 482                 if (result.uint_32 < 1)
 483                         goto out_of_range;
 484                 fsopt->max_readdir = result.uint_32;
 485                 break;
 486         case Opt_readdir_max_bytes:
 487                 if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
 488                         goto out_of_range;
 489                 fsopt->max_readdir_bytes = result.uint_32;
 490                 break;
 491         case Opt_congestion_kb:
 492                 if (result.uint_32 < 1024) /* at least 1M */
 493                         goto out_of_range;
 494                 fsopt->congestion_kb = result.uint_32;
 495                 break;
 496         case Opt_dirstat:
 497                 if (!result.negated)
 498                         fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 499                 else
 500                         fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 501                 break;
 502         case Opt_rbytes:
 503                 if (!result.negated)
 504                         fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 505                 else
 506                         fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 507                 break;
 508         case Opt_asyncreaddir:
 509                 if (!result.negated)
 510                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 511                 else
 512                         fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 513                 break;
 514         case Opt_dcache:
 515                 if (!result.negated)
 516                         fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 517                 else
 518                         fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 519                 break;
 520         case Opt_ino32:
 521                 if (!result.negated)
 522                         fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 523                 else
 524                         fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 525                 break;
 526
 527         case Opt_fscache:
 528 #ifdef CONFIG_CEPH_FSCACHE
 529                 kfree(fsopt->fscache_uniq);
 530                 fsopt->fscache_uniq = NULL;
 531                 if (result.negated) {
 532                         fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 533                 } else {
 534                         fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 535                         fsopt->fscache_uniq = param->string;
 536                         param->string = NULL;
 537                 }
 538                 break;
 539 #else
 540                 return invalfc(fc, "fscache support is disabled");
 541 #endif
 542         case Opt_poolperm:
 543                 if (!result.negated)
 544                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 545                 else
 546                         fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 547                 break;
 548         case Opt_require_active_mds:
 549                 if (!result.negated)
 550                         fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 551                 else
 552                         fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 553                 break;
 554         case Opt_quotadf:
 555                 if (!result.negated)
 556                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 557                 else
 558                         fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 559                 break;
 560         case Opt_copyfrom:
 561                 if (!result.negated)
 562                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 563                 else
 564                         fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 565                 break;
 566         case Opt_acl:
 567                 if (!result.negated) {
 568 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 569                         fc->sb_flags |= SB_POSIXACL;
 570 #else
 571                         return invalfc(fc, "POSIX ACL support is disabled");
 572 #endif
 573                 } else {
 574                         fc->sb_flags &= ~SB_POSIXACL;
 575                 }
 576                 break;
 577         case Opt_wsync:
 578                 if (!result.negated)
 579                         fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
 580                 else
 581                         fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
 582                 break;
 583         case Opt_pagecache:
 584                 if (result.negated)
 585                         fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
 586                 else
 587                         fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
 588                 break;
 589         case Opt_sparseread:
 590                 if (result.negated)
 591                         fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD;
 592                 else
 593                         fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
 594                 break;
 595         case Opt_test_dummy_encryption:
 596 #ifdef CONFIG_FS_ENCRYPTION
 597                 fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
 598                 ret = fscrypt_parse_test_dummy_encryption(param,
 599                                                 &fsopt->dummy_enc_policy);
 600                 if (ret == -EINVAL) {
 601                         warnfc(fc, "Value of option \"%s\" is unrecognized",
 602                                param->key);
 603                 } else if (ret == -EEXIST) {
 604                         warnfc(fc, "Conflicting test_dummy_encryption options");
 605                         ret = -EINVAL;
 606                 }
 607 #else
 608                 warnfc(fc,
 609                        "FS encryption not supported: test_dummy_encryption mount option ignored");
 610 #endif
 611                 break;
 612         default:
 613                 BUG();
 614         }
 615         return 0;
 616
 617 out_of_range:
 618         return invalfc(fc, "%s out of range", param->key);
 619 }
 620
 621 static void destroy_mount_options(struct ceph_mount_options *args)
 622 {
 623         dout("destroy_mount_options %p\n", args);
 624         if (!args)
 625                 return;
 626
 627         kfree(args->snapdir_name);
 628         kfree(args->mds_namespace);
 629         kfree(args->server_path);
 630         kfree(args->fscache_uniq);
 631         kfree(args->mon_addr);
 632         fscrypt_free_dummy_policy(&args->dummy_enc_policy);
 633         kfree(args);
 634 }
 635
 636 static int strcmp_null(const char *s1, const char *s2)
 637 {
 638         if (!s1 && !s2)
 639                 return 0;
 640         if (s1 && !s2)
 641                 return -1;
 642         if (!s1 && s2)
 643                 return 1;
 644         return strcmp(s1, s2);
 645 }
 646
 647 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 648                                  struct ceph_options *new_opt,
 649                                  struct ceph_fs_client *fsc)
 650 {
 651         struct ceph_mount_options *fsopt1 = new_fsopt;
 652         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 653         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 654         int ret;
 655
 656         ret = memcmp(fsopt1, fsopt2, ofs);
 657         if (ret)
 658                 return ret;
 659
 660         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 661         if (ret)
 662                 return ret;
 663
 664         ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 665         if (ret)
 666                 return ret;
 667
 668         ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 669         if (ret)
 670                 return ret;
 671
 672         ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 673         if (ret)
 674                 return ret;
 675
 676         ret = strcmp_null(fsopt1->mon_addr, fsopt2->mon_addr);
 677         if (ret)
 678                 return ret;
 679
 680         return ceph_compare_options(new_opt, fsc->client);
 681 }
 682
 683 /**
 684  * ceph_show_options - Show mount options in /proc/mounts
 685  * @m: seq_file to write to
 686  * @root: root of that (sub)tree
 687  */
 688 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 689 {
 690         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(root->d_sb);
 691         struct ceph_mount_options *fsopt = fsc->mount_options;
 692         size_t pos;
 693         int ret;
 694
 695         /* a comma between MNT/MS and client options */
 696         seq_putc(m, ',');
 697         pos = m->count;
 698
 699         ret = ceph_print_client_options(m, fsc->client, false);
 700         if (ret)
 701                 return ret;
 702
 703         /* retract our comma if no client options */
 704         if (m->count == pos)
 705                 m->count--;
 706
 707         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 708                 seq_puts(m, ",dirstat");
 709         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 710                 seq_puts(m, ",rbytes");
 711         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 712                 seq_puts(m, ",noasyncreaddir");
 713         if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 714                 seq_puts(m, ",nodcache");
 715         if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 716                 seq_puts(m, ",ino32");
 717         if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 718                 seq_show_option(m, "fsc", fsopt->fscache_uniq);
 719         }
 720         if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 721                 seq_puts(m, ",nopoolperm");
 722         if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 723                 seq_puts(m, ",noquotadf");
 724
 725 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 726         if (root->d_sb->s_flags & SB_POSIXACL)
 727                 seq_puts(m, ",acl");
 728         else
 729                 seq_puts(m, ",noacl");
 730 #endif
 731
 732         if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 733                 seq_puts(m, ",copyfrom");
 734
 735         /* dump mds_namespace when old device syntax is in use */
 736         if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
 737                 seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 738
 739         if (fsopt->mon_addr)
 740                 seq_printf(m, ",mon_addr=%s", fsopt->mon_addr);
 741
 742         if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 743                 seq_show_option(m, "recover_session", "clean");
 744
 745         if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS))
 746                 seq_puts(m, ",wsync");
 747         if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
 748                 seq_puts(m, ",nopagecache");
 749         if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
 750                 seq_puts(m, ",sparseread");
 751
 752         fscrypt_show_test_dummy_encryption(m, ',', root->d_sb);
 753
 754         if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 755                 seq_printf(m, ",wsize=%u", fsopt->wsize);
 756         if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 757                 seq_printf(m, ",rsize=%u", fsopt->rsize);
 758         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 759                 seq_printf(m, ",rasize=%u", fsopt->rasize);
 760         if (fsopt->congestion_kb != default_congestion_kb())
 761                 seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
 762         if (fsopt->caps_max)
 763                 seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 764         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 765                 seq_printf(m, ",caps_wanted_delay_min=%u",
 766                          fsopt->caps_wanted_delay_min);
 767         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 768                 seq_printf(m, ",caps_wanted_delay_max=%u",
 769                            fsopt->caps_wanted_delay_max);
 770         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 771                 seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
 772         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 773                 seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
 774         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 775                 seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 776
 777         return 0;
 778 }
 779
 780 /*
 781  * handle any mon messages the standard library doesn't understand.
 782  * return error if we don't either.
 783  */
 784 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 785 {
 786         struct ceph_fs_client *fsc = client->private;
 787         int type = le16_to_cpu(msg->hdr.type);
 788
 789         switch (type) {
 790         case CEPH_MSG_MDS_MAP:
 791                 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 792                 return 0;
 793         case CEPH_MSG_FS_MAP_USER:
 794                 ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 795                 return 0;
 796         default:
 797                 return -1;
 798         }
 799 }
 800
 801 /*
 802  * create a new fs client
 803  *
 804  * Success or not, this function consumes @fsopt and @opt.
 805  */
 806 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 807                                         struct ceph_options *opt)
 808 {
 809         struct ceph_fs_client *fsc;
 810         int err;
 811
 812         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 813         if (!fsc) {
 814                 err = -ENOMEM;
 815                 goto fail;
 816         }
 817
 818         fsc->client = ceph_create_client(opt, fsc);
 819         if (IS_ERR(fsc->client)) {
 820                 err = PTR_ERR(fsc->client);
 821                 goto fail;
 822         }
 823         opt = NULL; /* fsc->client now owns this */
 824
 825         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 826         ceph_set_opt(fsc->client, ABORT_ON_FULL);
 827
 828         if (!fsopt->mds_namespace) {
 829                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 830                                    0, true);
 831         } else {
 832                 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 833                                    0, false);
 834         }
 835
 836         fsc->mount_options = fsopt;
 837
 838         fsc->sb = NULL;
 839         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 840         fsc->filp_gen = 1;
 841         fsc->have_copy_from2 = true;
 842
 843         atomic_long_set(&fsc->writeback_count, 0);
 844         fsc->write_congested = false;
 845
 846         err = -ENOMEM;
 847         /*
 848          * The number of concurrent works can be high but they don't need
 849          * to be processed in parallel, limit concurrency.
 850          */
 851         fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 852         if (!fsc->inode_wq)
 853                 goto fail_client;
 854         fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 855         if (!fsc->cap_wq)
 856                 goto fail_inode_wq;
 857
 858         hash_init(fsc->async_unlink_conflict);
 859         spin_lock_init(&fsc->async_unlink_conflict_lock);
 860
 861         spin_lock(&ceph_fsc_lock);
 862         list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
 863         spin_unlock(&ceph_fsc_lock);
 864
 865         return fsc;
 866
 867 fail_inode_wq:
 868         destroy_workqueue(fsc->inode_wq);
 869 fail_client:
 870         ceph_destroy_client(fsc->client);
 871 fail:
 872         kfree(fsc);
 873         if (opt)
 874                 ceph_destroy_options(opt);
 875         destroy_mount_options(fsopt);
 876         return ERR_PTR(err);
 877 }
 878
 879 static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 880 {
 881         flush_workqueue(fsc->inode_wq);
 882         flush_workqueue(fsc->cap_wq);
 883 }
 884
 885 static void destroy_fs_client(struct ceph_fs_client *fsc)
 886 {
 887         doutc(fsc->client, "%p\n", fsc);
 888
 889         spin_lock(&ceph_fsc_lock);
 890         list_del(&fsc->metric_wakeup);
 891         spin_unlock(&ceph_fsc_lock);
 892
 893         ceph_mdsc_destroy(fsc);
 894         destroy_workqueue(fsc->inode_wq);
 895         destroy_workqueue(fsc->cap_wq);
 896
 897         destroy_mount_options(fsc->mount_options);
 898
 899         ceph_destroy_client(fsc->client);
 900
 901         kfree(fsc);
 902         dout("%s: %p done\n", __func__, fsc);
 903 }
 904
 905 /*
 906  * caches
 907  */
 908 struct kmem_cache *ceph_inode_cachep;
 909 struct kmem_cache *ceph_cap_cachep;
 910 struct kmem_cache *ceph_cap_snap_cachep;
 911 struct kmem_cache *ceph_cap_flush_cachep;
 912 struct kmem_cache *ceph_dentry_cachep;
 913 struct kmem_cache *ceph_file_cachep;
 914 struct kmem_cache *ceph_dir_file_cachep;
 915 struct kmem_cache *ceph_mds_request_cachep;
 916 mempool_t *ceph_wb_pagevec_pool;
 917
 918 static void ceph_inode_init_once(void *foo)
 919 {
 920         struct ceph_inode_info *ci = foo;
 921         inode_init_once(&ci->netfs.inode);
 922 }
 923
 924 static int __init init_caches(void)
 925 {
 926         int error = -ENOMEM;
 927
 928         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 929                                       sizeof(struct ceph_inode_info),
 930                                       __alignof__(struct ceph_inode_info),
 931                                       SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
 932                                       ceph_inode_init_once);
 933         if (!ceph_inode_cachep)
 934                 return -ENOMEM;
 935
 936         ceph_cap_cachep = KMEM_CACHE(ceph_cap, 0);
 937         if (!ceph_cap_cachep)
 938                 goto bad_cap;
 939         ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, 0);
 940         if (!ceph_cap_snap_cachep)
 941                 goto bad_cap_snap;
 942         ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 943                                            SLAB_RECLAIM_ACCOUNT);
 944         if (!ceph_cap_flush_cachep)
 945                 goto bad_cap_flush;
 946
 947         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 948                                         SLAB_RECLAIM_ACCOUNT);
 949         if (!ceph_dentry_cachep)
 950                 goto bad_dentry;
 951
 952         ceph_file_cachep = KMEM_CACHE(ceph_file_info, 0);
 953         if (!ceph_file_cachep)
 954                 goto bad_file;
 955
 956         ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, 0);
 957         if (!ceph_dir_file_cachep)
 958                 goto bad_dir_file;
 959
 960         ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, 0);
 961         if (!ceph_mds_request_cachep)
 962                 goto bad_mds_req;
 963
 964         ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
 965         if (!ceph_wb_pagevec_pool)
 966                 goto bad_pagevec_pool;
 967
 968         return 0;
 969
 970 bad_pagevec_pool:
 971         kmem_cache_destroy(ceph_mds_request_cachep);
 972 bad_mds_req:
 973         kmem_cache_destroy(ceph_dir_file_cachep);
 974 bad_dir_file:
 975         kmem_cache_destroy(ceph_file_cachep);
 976 bad_file:
 977         kmem_cache_destroy(ceph_dentry_cachep);
 978 bad_dentry:
 979         kmem_cache_destroy(ceph_cap_flush_cachep);
 980 bad_cap_flush:
 981         kmem_cache_destroy(ceph_cap_snap_cachep);
 982 bad_cap_snap:
 983         kmem_cache_destroy(ceph_cap_cachep);
 984 bad_cap:
 985         kmem_cache_destroy(ceph_inode_cachep);
 986         return error;
 987 }
 988
 989 static void destroy_caches(void)
 990 {
 991         /*
 992          * Make sure all delayed rcu free inodes are flushed before we
 993          * destroy cache.
 994          */
 995         rcu_barrier();
 996
 997         kmem_cache_destroy(ceph_inode_cachep);
 998         kmem_cache_destroy(ceph_cap_cachep);
 999         kmem_cache_destroy(ceph_cap_snap_cachep);
1000         kmem_cache_destroy(ceph_cap_flush_cachep);
1001         kmem_cache_destroy(ceph_dentry_cachep);
1002         kmem_cache_destroy(ceph_file_cachep);
1003         kmem_cache_destroy(ceph_dir_file_cachep);
1004         kmem_cache_destroy(ceph_mds_request_cachep);
1005         mempool_destroy(ceph_wb_pagevec_pool);
1006 }
1007
1008 static void __ceph_umount_begin(struct ceph_fs_client *fsc)
1009 {
1010         ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
1011         ceph_mdsc_force_umount(fsc->mdsc);
1012         fsc->filp_gen++; // invalidate open files
1013 }
1014
1015 /*
1016  * ceph_umount_begin - initiate forced umount.  Tear down the
1017  * mount, skipping steps that may hang while waiting for server(s).
1018  */
1019 void ceph_umount_begin(struct super_block *sb)
1020 {
1021         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1022
1023         doutc(fsc->client, "starting forced umount\n");
1024         if (!fsc)
1025                 return;
1026         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
1027         __ceph_umount_begin(fsc);
1028 }
1029
1030 static const struct super_operations ceph_super_ops = {
1031         .alloc_inode    = ceph_alloc_inode,
1032         .free_inode     = ceph_free_inode,
1033         .write_inode    = ceph_write_inode,
1034         .drop_inode     = generic_delete_inode,
1035         .evict_inode    = ceph_evict_inode,
1036         .sync_fs        = ceph_sync_fs,
1037         .put_super      = ceph_put_super,
1038         .show_options   = ceph_show_options,
1039         .statfs         = ceph_statfs,
1040         .umount_begin   = ceph_umount_begin,
1041 };
1042
1043 /*
1044  * Bootstrap mount by opening the root directory.  Note the mount
1045  * @started time from caller, and time out if this takes too long.
1046  */
1047 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
1048                                        const char *path,
1049                                        unsigned long started)
1050 {
1051         struct ceph_client *cl = fsc->client;
1052         struct ceph_mds_client *mdsc = fsc->mdsc;
1053         struct ceph_mds_request *req = NULL;
1054         int err;
1055         struct dentry *root;
1056
1057         /* open dir */
1058         doutc(cl, "opening '%s'\n", path);
1059         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1060         if (IS_ERR(req))
1061                 return ERR_CAST(req);
1062         req->r_path1 = kstrdup(path, GFP_NOFS);
1063         if (!req->r_path1) {
1064                 root = ERR_PTR(-ENOMEM);
1065                 goto out;
1066         }
1067
1068         req->r_ino1.ino = CEPH_INO_ROOT;
1069         req->r_ino1.snap = CEPH_NOSNAP;
1070         req->r_started = started;
1071         req->r_timeout = fsc->client->options->mount_timeout;
1072         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
1073         req->r_num_caps = 2;
1074         err = ceph_mdsc_do_request(mdsc, NULL, req);
1075         if (err == 0) {
1076                 struct inode *inode = req->r_target_inode;
1077                 req->r_target_inode = NULL;
1078                 doutc(cl, "success\n");
1079                 root = d_make_root(inode);
1080                 if (!root) {
1081                         root = ERR_PTR(-ENOMEM);
1082                         goto out;
1083                 }
1084                 doutc(cl, "success, root dentry is %p\n", root);
1085         } else {
1086                 root = ERR_PTR(err);
1087         }
1088 out:
1089         ceph_mdsc_put_request(req);
1090         return root;
1091 }
1092
1093 #ifdef CONFIG_FS_ENCRYPTION
1094 static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1095                                             struct fs_context *fc,
1096                                             struct ceph_mount_options *fsopt)
1097 {
1098         struct ceph_fs_client *fsc = sb->s_fs_info;
1099
1100         if (!fscrypt_is_dummy_policy_set(&fsopt->dummy_enc_policy))
1101                 return 0;
1102
1103         /* No changing encryption context on remount. */
1104         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
1105             !fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1106                 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1107                                                  &fsc->fsc_dummy_enc_policy))
1108                         return 0;
1109                 errorfc(fc, "Can't set test_dummy_encryption on remount");
1110                 return -EINVAL;
1111         }
1112
1113         /* Also make sure fsopt doesn't contain a conflicting value. */
1114         if (fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
1115                 if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
1116                                                  &fsc->fsc_dummy_enc_policy))
1117                         return 0;
1118                 errorfc(fc, "Conflicting test_dummy_encryption options");
1119                 return -EINVAL;
1120         }
1121
1122         fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
1123         memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
1124
1125         warnfc(fc, "test_dummy_encryption mode enabled");
1126         return 0;
1127 }
1128 #else
1129 static int ceph_apply_test_dummy_encryption(struct super_block *sb,
1130                                             struct fs_context *fc,
1131                                             struct ceph_mount_options *fsopt)
1132 {
1133         return 0;
1134 }
1135 #endif
1136
1137 /*
1138  * mount: join the ceph cluster, and open root directory.
1139  */
1140 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
1141                                       struct fs_context *fc)
1142 {
1143         struct ceph_client *cl = fsc->client;
1144         int err;
1145         unsigned long started = jiffies;  /* note the start time */
1146         struct dentry *root;
1147
1148         doutc(cl, "mount start %p\n", fsc);
1149         mutex_lock(&fsc->client->mount_mutex);
1150
1151         if (!fsc->sb->s_root) {
1152                 const char *path = fsc->mount_options->server_path ?
1153                                      fsc->mount_options->server_path + 1 : "";
1154
1155                 err = __ceph_open_session(fsc->client, started);
1156                 if (err < 0)
1157                         goto out;
1158
1159                 /* setup fscache */
1160                 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
1161                         err = ceph_fscache_register_fs(fsc, fc);
1162                         if (err < 0)
1163                                 goto out;
1164                 }
1165
1166                 err = ceph_apply_test_dummy_encryption(fsc->sb, fc,
1167                                                        fsc->mount_options);
1168                 if (err)
1169                         goto out;
1170
1171                 doutc(cl, "mount opening path '%s'\n", path);
1172
1173                 ceph_fs_debugfs_init(fsc);
1174
1175                 root = open_root_dentry(fsc, path, started);
1176                 if (IS_ERR(root)) {
1177                         err = PTR_ERR(root);
1178                         goto out;
1179                 }
1180                 fsc->sb->s_root = dget(root);
1181         } else {
1182                 root = dget(fsc->sb->s_root);
1183         }
1184
1185         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1186         doutc(cl, "mount success\n");
1187         mutex_unlock(&fsc->client->mount_mutex);
1188         return root;
1189
1190 out:
1191         mutex_unlock(&fsc->client->mount_mutex);
1192         ceph_fscrypt_free_dummy_policy(fsc);
1193         return ERR_PTR(err);
1194 }
1195
1196 static int ceph_set_super(struct super_block *s, struct fs_context *fc)
1197 {
1198         struct ceph_fs_client *fsc = s->s_fs_info;
1199         struct ceph_client *cl = fsc->client;
1200         int ret;
1201
1202         doutc(cl, "%p\n", s);
1203
1204         s->s_maxbytes = MAX_LFS_FILESIZE;
1205
1206         s->s_xattr = ceph_xattr_handlers;
1207         fsc->sb = s;
1208         fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
1209
1210         s->s_op = &ceph_super_ops;
1211         s->s_d_op = &ceph_dentry_ops;
1212         s->s_export_op = &ceph_export_ops;
1213
1214         s->s_time_gran = 1;
1215         s->s_time_min = 0;
1216         s->s_time_max = U32_MAX;
1217         s->s_flags |= SB_NODIRATIME | SB_NOATIME;
1218
1219         ceph_fscrypt_set_ops(s);
1220
1221         ret = set_anon_super_fc(s, fc);
1222         if (ret != 0)
1223                 fsc->sb = NULL;
1224         return ret;
1225 }
1226
1227 /*
1228  * share superblock if same fs AND options
1229  */
1230 static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1231 {
1232         struct ceph_fs_client *new = fc->s_fs_info;
1233         struct ceph_mount_options *fsopt = new->mount_options;
1234         struct ceph_options *opt = new->client->options;
1235         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1236         struct ceph_client *cl = fsc->client;
1237
1238         doutc(cl, "%p\n", sb);
1239
1240         if (compare_mount_options(fsopt, opt, fsc)) {
1241                 doutc(cl, "monitor(s)/mount options don't match\n");
1242                 return 0;
1243         }
1244         if ((opt->flags & CEPH_OPT_FSID) &&
1245             ceph_fsid_compare(&opt->fsid, &fsc->client->fsid)) {
1246                 doutc(cl, "fsid doesn't match\n");
1247                 return 0;
1248         }
1249         if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1250                 doutc(cl, "flags differ\n");
1251                 return 0;
1252         }
1253
1254         if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
1255                 doutc(cl, "client is blocklisted (and CLEANRECOVER is not set)\n");
1256                 return 0;
1257         }
1258
1259         if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
1260                 doutc(cl, "client has been forcibly unmounted\n");
1261                 return 0;
1262         }
1263
1264         return 1;
1265 }
1266
1267 /*
1268  * construct our own bdi so we can control readahead, etc.
1269  */
1270 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1271
1272 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1273 {
1274         int err;
1275
1276         err = super_setup_bdi_name(sb, "ceph-%ld",
1277                                    atomic_long_inc_return(&bdi_seq));
1278         if (err)
1279                 return err;
1280
1281         /* set ra_pages based on rasize mount option? */
1282         sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1283
1284         /* set io_pages based on max osd read size */
1285         sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1286
1287         return 0;
1288 }
1289
1290 static int ceph_get_tree(struct fs_context *fc)
1291 {
1292         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1293         struct ceph_mount_options *fsopt = pctx->opts;
1294         struct super_block *sb;
1295         struct ceph_fs_client *fsc;
1296         struct dentry *res;
1297         int (*compare_super)(struct super_block *, struct fs_context *) =
1298                 ceph_compare_super;
1299         int err;
1300
1301         dout("ceph_get_tree\n");
1302
1303         if (!fc->source)
1304                 return invalfc(fc, "No source");
1305         if (fsopt->new_dev_syntax && !fsopt->mon_addr)
1306                 return invalfc(fc, "No monitor address");
1307
1308         /* create client (which we may/may not use) */
1309         fsc = create_fs_client(pctx->opts, pctx->copts);
1310         pctx->opts = NULL;
1311         pctx->copts = NULL;
1312         if (IS_ERR(fsc)) {
1313                 err = PTR_ERR(fsc);
1314                 goto out_final;
1315         }
1316
1317         err = ceph_mdsc_init(fsc);
1318         if (err < 0)
1319                 goto out;
1320
1321         if (ceph_test_opt(fsc->client, NOSHARE))
1322                 compare_super = NULL;
1323
1324         fc->s_fs_info = fsc;
1325         sb = sget_fc(fc, compare_super, ceph_set_super);
1326         fc->s_fs_info = NULL;
1327         if (IS_ERR(sb)) {
1328                 err = PTR_ERR(sb);
1329                 goto out;
1330         }
1331
1332         if (ceph_sb_to_fs_client(sb) != fsc) {
1333                 destroy_fs_client(fsc);
1334                 fsc = ceph_sb_to_fs_client(sb);
1335                 dout("get_sb got existing client %p\n", fsc);
1336         } else {
1337                 dout("get_sb using new client %p\n", fsc);
1338                 err = ceph_setup_bdi(sb, fsc);
1339                 if (err < 0)
1340                         goto out_splat;
1341         }
1342
1343         res = ceph_real_mount(fsc, fc);
1344         if (IS_ERR(res)) {
1345                 err = PTR_ERR(res);
1346                 goto out_splat;
1347         }
1348
1349         doutc(fsc->client, "root %p inode %p ino %llx.%llx\n", res,
1350                     d_inode(res), ceph_vinop(d_inode(res)));
1351         fc->root = fsc->sb->s_root;
1352         return 0;
1353
1354 out_splat:
1355         if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1356                 pr_info("No mds server is up or the cluster is laggy\n");
1357                 err = -EHOSTUNREACH;
1358         }
1359
1360         ceph_mdsc_close_sessions(fsc->mdsc);
1361         deactivate_locked_super(sb);
1362         goto out_final;
1363
1364 out:
1365         destroy_fs_client(fsc);
1366 out_final:
1367         dout("ceph_get_tree fail %d\n", err);
1368         return err;
1369 }
1370
1371 static void ceph_free_fc(struct fs_context *fc)
1372 {
1373         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1374
1375         if (pctx) {
1376                 destroy_mount_options(pctx->opts);
1377                 ceph_destroy_options(pctx->copts);
1378                 kfree(pctx);
1379         }
1380 }
1381
1382 static int ceph_reconfigure_fc(struct fs_context *fc)
1383 {
1384         int err;
1385         struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1386         struct ceph_mount_options *fsopt = pctx->opts;
1387         struct super_block *sb = fc->root->d_sb;
1388         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1389
1390         err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
1391         if (err)
1392                 return err;
1393
1394         if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1395                 ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1396         else
1397                 ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1398
1399         if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
1400                 ceph_set_mount_opt(fsc, SPARSEREAD);
1401         else
1402                 ceph_clear_mount_opt(fsc, SPARSEREAD);
1403
1404         if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
1405                 kfree(fsc->mount_options->mon_addr);
1406                 fsc->mount_options->mon_addr = fsopt->mon_addr;
1407                 fsopt->mon_addr = NULL;
1408                 pr_notice_client(fsc->client,
1409                         "monitor addresses recorded, but not used for reconnection");
1410         }
1411
1412         sync_filesystem(sb);
1413         return 0;
1414 }
1415
1416 static const struct fs_context_operations ceph_context_ops = {
1417         .free           = ceph_free_fc,
1418         .parse_param    = ceph_parse_mount_param,
1419         .get_tree       = ceph_get_tree,
1420         .reconfigure    = ceph_reconfigure_fc,
1421 };
1422
1423 /*
1424  * Set up the filesystem mount context.
1425  */
1426 static int ceph_init_fs_context(struct fs_context *fc)
1427 {
1428         struct ceph_parse_opts_ctx *pctx;
1429         struct ceph_mount_options *fsopt;
1430
1431         pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1432         if (!pctx)
1433                 return -ENOMEM;
1434
1435         pctx->copts = ceph_alloc_options();
1436         if (!pctx->copts)
1437                 goto nomem;
1438
1439         pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1440         if (!pctx->opts)
1441                 goto nomem;
1442
1443         fsopt = pctx->opts;
1444         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1445
1446         fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1447         fsopt->rsize = CEPH_MAX_READ_SIZE;
1448         fsopt->rasize = CEPH_RASIZE_DEFAULT;
1449         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1450         if (!fsopt->snapdir_name)
1451                 goto nomem;
1452
1453         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1454         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1455         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1456         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1457         fsopt->congestion_kb = default_congestion_kb();
1458
1459 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1460         fc->sb_flags |= SB_POSIXACL;
1461 #endif
1462
1463         fc->fs_private = pctx;
1464         fc->ops = &ceph_context_ops;
1465         return 0;
1466
1467 nomem:
1468         destroy_mount_options(pctx->opts);
1469         ceph_destroy_options(pctx->copts);
1470         kfree(pctx);
1471         return -ENOMEM;
1472 }
1473
1474 /*
1475  * Return true if it successfully increases the blocker counter,
1476  * or false if the mdsc is in stopping and flushed state.
1477  */
1478 static bool __inc_stopping_blocker(struct ceph_mds_client *mdsc)
1479 {
1480         spin_lock(&mdsc->stopping_lock);
1481         if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING) {
1482                 spin_unlock(&mdsc->stopping_lock);
1483                 return false;
1484         }
1485         atomic_inc(&mdsc->stopping_blockers);
1486         spin_unlock(&mdsc->stopping_lock);
1487         return true;
1488 }
1489
1490 static void __dec_stopping_blocker(struct ceph_mds_client *mdsc)
1491 {
1492         spin_lock(&mdsc->stopping_lock);
1493         if (!atomic_dec_return(&mdsc->stopping_blockers) &&
1494             mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHING)
1495                 complete_all(&mdsc->stopping_waiter);
1496         spin_unlock(&mdsc->stopping_lock);
1497 }
1498
1499 /* For metadata IO requests */
1500 bool ceph_inc_mds_stopping_blocker(struct ceph_mds_client *mdsc,
1501                                    struct ceph_mds_session *session)
1502 {
1503         mutex_lock(&session->s_mutex);
1504         inc_session_sequence(session);
1505         mutex_unlock(&session->s_mutex);
1506
1507         return __inc_stopping_blocker(mdsc);
1508 }
1509
1510 void ceph_dec_mds_stopping_blocker(struct ceph_mds_client *mdsc)
1511 {
1512         __dec_stopping_blocker(mdsc);
1513 }
1514
1515 /* For data IO requests */
1516 bool ceph_inc_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1517 {
1518         return __inc_stopping_blocker(mdsc);
1519 }
1520
1521 void ceph_dec_osd_stopping_blocker(struct ceph_mds_client *mdsc)
1522 {
1523         __dec_stopping_blocker(mdsc);
1524 }
1525
1526 static void ceph_kill_sb(struct super_block *s)
1527 {
1528         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(s);
1529         struct ceph_client *cl = fsc->client;
1530         struct ceph_mds_client *mdsc = fsc->mdsc;
1531         bool wait;
1532
1533         doutc(cl, "%p\n", s);
1534
1535         ceph_mdsc_pre_umount(mdsc);
1536         flush_fs_workqueues(fsc);
1537
1538         /*
1539          * Though the kill_anon_super() will finally trigger the
1540          * sync_filesystem() anyway, we still need to do it here and
1541          * then bump the stage of shutdown. This will allow us to
1542          * drop any further message, which will increase the inodes'
1543          * i_count reference counters but makes no sense any more,
1544          * from MDSs.
1545          *
1546          * Without this when evicting the inodes it may fail in the
1547          * kill_anon_super(), which will trigger a warning when
1548          * destroying the fscrypt keyring and then possibly trigger
1549          * a further crash in ceph module when the iput() tries to
1550          * evict the inodes later.
1551          */
1552         sync_filesystem(s);
1553
1554         spin_lock(&mdsc->stopping_lock);
1555         mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHING;
1556         wait = !!atomic_read(&mdsc->stopping_blockers);
1557         spin_unlock(&mdsc->stopping_lock);
1558
1559         if (wait && atomic_read(&mdsc->stopping_blockers)) {
1560                 long timeleft = wait_for_completion_killable_timeout(
1561                                         &mdsc->stopping_waiter,
1562                                         fsc->client->options->mount_timeout);
1563                 if (!timeleft) /* timed out */
1564                         pr_warn_client(cl, "umount timed out, %ld\n", timeleft);
1565                 else if (timeleft < 0) /* killed */
1566                         pr_warn_client(cl, "umount was killed, %ld\n", timeleft);
1567         }
1568
1569         mdsc->stopping = CEPH_MDSC_STOPPING_FLUSHED;
1570         kill_anon_super(s);
1571
1572         fsc->client->extra_mon_dispatch = NULL;
1573         ceph_fs_debugfs_cleanup(fsc);
1574
1575         ceph_fscache_unregister_fs(fsc);
1576
1577         destroy_fs_client(fsc);
1578 }
1579
1580 static struct file_system_type ceph_fs_type = {
1581         .owner          = THIS_MODULE,
1582         .name           = "ceph",
1583         .init_fs_context = ceph_init_fs_context,
1584         .kill_sb        = ceph_kill_sb,
1585         .fs_flags       = FS_RENAME_DOES_D_MOVE | FS_ALLOW_IDMAP,
1586 };
1587 MODULE_ALIAS_FS("ceph");
1588
1589 int ceph_force_reconnect(struct super_block *sb)
1590 {
1591         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(sb);
1592         int err = 0;
1593
1594         fsc->mount_state = CEPH_MOUNT_RECOVER;
1595         __ceph_umount_begin(fsc);
1596
1597         /* Make sure all page caches get invalidated.
1598          * see remove_session_caps_cb() */
1599         flush_workqueue(fsc->inode_wq);
1600
1601         /* In case that we were blocklisted. This also reset
1602          * all mon/osd connections */
1603         ceph_reset_client_addr(fsc->client);
1604
1605         ceph_osdc_clear_abort_err(&fsc->client->osdc);
1606
1607         fsc->blocklisted = false;
1608         fsc->mount_state = CEPH_MOUNT_MOUNTED;
1609
1610         if (sb->s_root) {
1611                 err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1612                                         CEPH_STAT_CAP_INODE, true);
1613         }
1614         return err;
1615 }
1616
1617 static int __init init_ceph(void)
1618 {
1619         int ret = init_caches();
1620         if (ret)
1621                 goto out;
1622
1623         ceph_flock_init();
1624         ret = register_filesystem(&ceph_fs_type);
1625         if (ret)
1626                 goto out_caches;
1627
1628         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1629
1630         return 0;
1631
1632 out_caches:
1633         destroy_caches();
1634 out:
1635         return ret;
1636 }
1637
1638 static void __exit exit_ceph(void)
1639 {
1640         dout("exit_ceph\n");
1641         unregister_filesystem(&ceph_fs_type);
1642         destroy_caches();
1643 }
1644
1645 static int param_set_metrics(const char *val, const struct kernel_param *kp)
1646 {
1647         struct ceph_fs_client *fsc;
1648         int ret;
1649
1650         ret = param_set_bool(val, kp);
1651         if (ret) {
1652                 pr_err("Failed to parse sending metrics switch value '%s'\n",
1653                        val);
1654                 return ret;
1655         } else if (!disable_send_metrics) {
1656                 // wake up all the mds clients
1657                 spin_lock(&ceph_fsc_lock);
1658                 list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1659                         metric_schedule_delayed(&fsc->mdsc->metric);
1660                 }
1661                 spin_unlock(&ceph_fsc_lock);
1662         }
1663
1664         return 0;
1665 }
1666
1667 static const struct kernel_param_ops param_ops_metrics = {
1668         .set = param_set_metrics,
1669         .get = param_get_bool,
1670 };
1671
1672 bool disable_send_metrics = false;
1673 module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
1674 MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1675
1676 /* for both v1 and v2 syntax */
1677 static bool mount_support = true;
1678 static const struct kernel_param_ops param_ops_mount_syntax = {
1679         .get = param_get_bool,
1680 };
1681 module_param_cb(mount_syntax_v1, &param_ops_mount_syntax, &mount_support, 0444);
1682 module_param_cb(mount_syntax_v2, &param_ops_mount_syntax, &mount_support, 0444);
1683
1684 bool enable_unsafe_idmap = false;
1685 module_param(enable_unsafe_idmap, bool, 0644);
1686 MODULE_PARM_DESC(enable_unsafe_idmap,
1687                  "Allow to use idmapped mounts with MDS without CEPHFS_FEATURE_HAS_OWNER_UIDGID");
1688
1689 module_init(init_ceph);
1690 module_exit(exit_ceph);
1691
1692 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1693 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1694 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1695 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1696 MODULE_LICENSE("GPL");