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