linux/fs/ceph/super.c
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   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
  30static DEFINE_SPINLOCK(ceph_fsc_lock);
  31static LIST_HEAD(ceph_fsc_list);
  32
  33/*
  34 * Ceph superblock operations
  35 *
  36 * Handle the basics of mounting, unmounting.
  37 */
  38
  39/*
  40 * super ops
  41 */
  42static void ceph_put_super(struct super_block *s)
  43{
  44        struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  45
  46        dout("put_super\n");
  47        ceph_mdsc_close_sessions(fsc->mdsc);
  48}
  49
  50static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  51{
  52        struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  53        struct ceph_mon_client *monc = &fsc->client->monc;
  54        struct ceph_statfs st;
  55        u64 fsid;
  56        int err;
  57        u64 data_pool;
  58
  59        if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
  60                data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
  61        } else {
  62                data_pool = CEPH_NOPOOL;
  63        }
  64
  65        dout("statfs\n");
  66        err = ceph_monc_do_statfs(monc, data_pool, &st);
  67        if (err < 0)
  68                return err;
  69
  70        /* fill in kstatfs */
  71        buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  72
  73        /*
  74         * express utilization in terms of large blocks to avoid
  75         * overflow on 32-bit machines.
  76         *
  77         * NOTE: for the time being, we make bsize == frsize to humor
  78         * not-yet-ancient versions of glibc that are broken.
  79         * Someday, we will probably want to report a real block
  80         * size...  whatever that may mean for a network file system!
  81         */
  82        buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  83        buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  84
  85        /*
  86         * By default use root quota for stats; fallback to overall filesystem
  87         * usage if using 'noquotadf' mount option or if the root dir doesn't
  88         * have max_bytes quota set.
  89         */
  90        if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
  91            !ceph_quota_update_statfs(fsc, buf)) {
  92                buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  93                buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  94                buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  95        }
  96
  97        buf->f_files = le64_to_cpu(st.num_objects);
  98        buf->f_ffree = -1;
  99        buf->f_namelen = NAME_MAX;
 100
 101        /* Must convert the fsid, for consistent values across arches */
 102        mutex_lock(&monc->mutex);
 103        fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
 104               le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
 105        mutex_unlock(&monc->mutex);
 106
 107        buf->f_fsid = u64_to_fsid(fsid);
 108
 109        return 0;
 110}
 111
 112static int ceph_sync_fs(struct super_block *sb, int wait)
 113{
 114        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 115
 116        if (!wait) {
 117                dout("sync_fs (non-blocking)\n");
 118                ceph_flush_dirty_caps(fsc->mdsc);
 119                dout("sync_fs (non-blocking) done\n");
 120                return 0;
 121        }
 122
 123        dout("sync_fs (blocking)\n");
 124        ceph_osdc_sync(&fsc->client->osdc);
 125        ceph_mdsc_sync(fsc->mdsc);
 126        dout("sync_fs (blocking) done\n");
 127        return 0;
 128}
 129
 130/*
 131 * mount options
 132 */
 133enum {
 134        Opt_wsize,
 135        Opt_rsize,
 136        Opt_rasize,
 137        Opt_caps_wanted_delay_min,
 138        Opt_caps_wanted_delay_max,
 139        Opt_caps_max,
 140        Opt_readdir_max_entries,
 141        Opt_readdir_max_bytes,
 142        Opt_congestion_kb,
 143        /* int args above */
 144        Opt_snapdirname,
 145        Opt_mds_namespace,
 146        Opt_recover_session,
 147        Opt_source,
 148        /* string args above */
 149        Opt_dirstat,
 150        Opt_rbytes,
 151        Opt_asyncreaddir,
 152        Opt_dcache,
 153        Opt_ino32,
 154        Opt_fscache,
 155        Opt_poolperm,
 156        Opt_require_active_mds,
 157        Opt_acl,
 158        Opt_quotadf,
 159        Opt_copyfrom,
 160        Opt_wsync,
 161};
 162
 163enum ceph_recover_session_mode {
 164        ceph_recover_session_no,
 165        ceph_recover_session_clean
 166};
 167
 168static const struct constant_table ceph_param_recover[] = {
 169        { "no",         ceph_recover_session_no },
 170        { "clean",      ceph_recover_session_clean },
 171        {}
 172};
 173
 174static const struct fs_parameter_spec ceph_mount_parameters[] = {
 175        fsparam_flag_no ("acl",                         Opt_acl),
 176        fsparam_flag_no ("asyncreaddir",                Opt_asyncreaddir),
 177        fsparam_s32     ("caps_max",                    Opt_caps_max),
 178        fsparam_u32     ("caps_wanted_delay_max",       Opt_caps_wanted_delay_max),
 179        fsparam_u32     ("caps_wanted_delay_min",       Opt_caps_wanted_delay_min),
 180        fsparam_u32     ("write_congestion_kb",         Opt_congestion_kb),
 181        fsparam_flag_no ("copyfrom",                    Opt_copyfrom),
 182        fsparam_flag_no ("dcache",                      Opt_dcache),
 183        fsparam_flag_no ("dirstat",                     Opt_dirstat),
 184        fsparam_flag_no ("fsc",                         Opt_fscache), // fsc|nofsc
 185        fsparam_string  ("fsc",                         Opt_fscache), // fsc=...
 186        fsparam_flag_no ("ino32",                       Opt_ino32),
 187        fsparam_string  ("mds_namespace",               Opt_mds_namespace),
 188        fsparam_flag_no ("poolperm",                    Opt_poolperm),
 189        fsparam_flag_no ("quotadf",                     Opt_quotadf),
 190        fsparam_u32     ("rasize",                      Opt_rasize),
 191        fsparam_flag_no ("rbytes",                      Opt_rbytes),
 192        fsparam_u32     ("readdir_max_bytes",           Opt_readdir_max_bytes),
 193        fsparam_u32     ("readdir_max_entries",         Opt_readdir_max_entries),
 194        fsparam_enum    ("recover_session",             Opt_recover_session, ceph_param_recover),
 195        fsparam_flag_no ("require_active_mds",          Opt_require_active_mds),
 196        fsparam_u32     ("rsize",                       Opt_rsize),
 197        fsparam_string  ("snapdirname",                 Opt_snapdirname),
 198        fsparam_string  ("source",                      Opt_source),
 199        fsparam_u32     ("wsize",                       Opt_wsize),
 200        fsparam_flag_no ("wsync",                       Opt_wsync),
 201        {}
 202};
 203
 204struct ceph_parse_opts_ctx {
 205        struct ceph_options             *copts;
 206        struct ceph_mount_options       *opts;
 207};
 208
 209/*
 210 * Remove adjacent slashes and then the trailing slash, unless it is
 211 * the only remaining character.
 212 *
 213 * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
 214 */
 215static void canonicalize_path(char *path)
 216{
 217        int i, j = 0;
 218
 219        for (i = 0; path[i] != '\0'; i++) {
 220                if (path[i] != '/' || j < 1 || path[j - 1] != '/')
 221                        path[j++] = path[i];
 222        }
 223
 224        if (j > 1 && path[j - 1] == '/')
 225                j--;
 226        path[j] = '\0';
 227}
 228
 229/*
 230 * Parse the source parameter.  Distinguish the server list from the path.
 231 *
 232 * The source will look like:
 233 *     <server_spec>[,<server_spec>...]:[<path>]
 234 * where
 235 *     <server_spec> is <ip>[:<port>]
 236 *     <path> is optional, but if present must begin with '/'
 237 */
 238static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
 239{
 240        struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 241        struct ceph_mount_options *fsopt = pctx->opts;
 242        char *dev_name = param->string, *dev_name_end;
 243        int ret;
 244
 245        dout("%s '%s'\n", __func__, dev_name);
 246        if (!dev_name || !*dev_name)
 247                return invalfc(fc, "Empty source");
 248
 249        dev_name_end = strchr(dev_name, '/');
 250        if (dev_name_end) {
 251                /*
 252                 * The server_path will include the whole chars from userland
 253                 * including the leading '/'.
 254                 */
 255                kfree(fsopt->server_path);
 256                fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 257                if (!fsopt->server_path)
 258                        return -ENOMEM;
 259
 260                canonicalize_path(fsopt->server_path);
 261        } else {
 262                dev_name_end = dev_name + strlen(dev_name);
 263        }
 264
 265        dev_name_end--;         /* back up to ':' separator */
 266        if (dev_name_end < dev_name || *dev_name_end != ':')
 267                return invalfc(fc, "No path or : separator in source");
 268
 269        dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 270        if (fsopt->server_path)
 271                dout("server path '%s'\n", fsopt->server_path);
 272
 273        ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
 274                                 pctx->copts, fc->log.log);
 275        if (ret)
 276                return ret;
 277
 278        fc->source = param->string;
 279        param->string = NULL;
 280        return 0;
 281}
 282
 283static int ceph_parse_mount_param(struct fs_context *fc,
 284                                  struct fs_parameter *param)
 285{
 286        struct ceph_parse_opts_ctx *pctx = fc->fs_private;
 287        struct ceph_mount_options *fsopt = pctx->opts;
 288        struct fs_parse_result result;
 289        unsigned int mode;
 290        int token, ret;
 291
 292        ret = ceph_parse_param(param, pctx->copts, fc->log.log);
 293        if (ret != -ENOPARAM)
 294                return ret;
 295
 296        token = fs_parse(fc, ceph_mount_parameters, param, &result);
 297        dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
 298        if (token < 0)
 299                return token;
 300
 301        switch (token) {
 302        case Opt_snapdirname:
 303                kfree(fsopt->snapdir_name);
 304                fsopt->snapdir_name = param->string;
 305                param->string = NULL;
 306                break;
 307        case Opt_mds_namespace:
 308                kfree(fsopt->mds_namespace);
 309                fsopt->mds_namespace = param->string;
 310                param->string = NULL;
 311                break;
 312        case Opt_recover_session:
 313                mode = result.uint_32;
 314                if (mode == ceph_recover_session_no)
 315                        fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
 316                else if (mode == ceph_recover_session_clean)
 317                        fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
 318                else
 319                        BUG();
 320                break;
 321        case Opt_source:
 322                if (fc->source)
 323                        return invalfc(fc, "Multiple sources specified");
 324                return ceph_parse_source(param, fc);
 325        case Opt_wsize:
 326                if (result.uint_32 < PAGE_SIZE ||
 327                    result.uint_32 > CEPH_MAX_WRITE_SIZE)
 328                        goto out_of_range;
 329                fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
 330                break;
 331        case Opt_rsize:
 332                if (result.uint_32 < PAGE_SIZE ||
 333                    result.uint_32 > CEPH_MAX_READ_SIZE)
 334                        goto out_of_range;
 335                fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
 336                break;
 337        case Opt_rasize:
 338                fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
 339                break;
 340        case Opt_caps_wanted_delay_min:
 341                if (result.uint_32 < 1)
 342                        goto out_of_range;
 343                fsopt->caps_wanted_delay_min = result.uint_32;
 344                break;
 345        case Opt_caps_wanted_delay_max:
 346                if (result.uint_32 < 1)
 347                        goto out_of_range;
 348                fsopt->caps_wanted_delay_max = result.uint_32;
 349                break;
 350        case Opt_caps_max:
 351                if (result.int_32 < 0)
 352                        goto out_of_range;
 353                fsopt->caps_max = result.int_32;
 354                break;
 355        case Opt_readdir_max_entries:
 356                if (result.uint_32 < 1)
 357                        goto out_of_range;
 358                fsopt->max_readdir = result.uint_32;
 359                break;
 360        case Opt_readdir_max_bytes:
 361                if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
 362                        goto out_of_range;
 363                fsopt->max_readdir_bytes = result.uint_32;
 364                break;
 365        case Opt_congestion_kb:
 366                if (result.uint_32 < 1024) /* at least 1M */
 367                        goto out_of_range;
 368                fsopt->congestion_kb = result.uint_32;
 369                break;
 370        case Opt_dirstat:
 371                if (!result.negated)
 372                        fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 373                else
 374                        fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 375                break;
 376        case Opt_rbytes:
 377                if (!result.negated)
 378                        fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 379                else
 380                        fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 381                break;
 382        case Opt_asyncreaddir:
 383                if (!result.negated)
 384                        fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 385                else
 386                        fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 387                break;
 388        case Opt_dcache:
 389                if (!result.negated)
 390                        fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 391                else
 392                        fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 393                break;
 394        case Opt_ino32:
 395                if (!result.negated)
 396                        fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 397                else
 398                        fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 399                break;
 400
 401        case Opt_fscache:
 402#ifdef CONFIG_CEPH_FSCACHE
 403                kfree(fsopt->fscache_uniq);
 404                fsopt->fscache_uniq = NULL;
 405                if (result.negated) {
 406                        fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 407                } else {
 408                        fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 409                        fsopt->fscache_uniq = param->string;
 410                        param->string = NULL;
 411                }
 412                break;
 413#else
 414                return invalfc(fc, "fscache support is disabled");
 415#endif
 416        case Opt_poolperm:
 417                if (!result.negated)
 418                        fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 419                else
 420                        fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 421                break;
 422        case Opt_require_active_mds:
 423                if (!result.negated)
 424                        fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 425                else
 426                        fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 427                break;
 428        case Opt_quotadf:
 429                if (!result.negated)
 430                        fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
 431                else
 432                        fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
 433                break;
 434        case Opt_copyfrom:
 435                if (!result.negated)
 436                        fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
 437                else
 438                        fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
 439                break;
 440        case Opt_acl:
 441                if (!result.negated) {
 442#ifdef CONFIG_CEPH_FS_POSIX_ACL
 443                        fc->sb_flags |= SB_POSIXACL;
 444#else
 445                        return invalfc(fc, "POSIX ACL support is disabled");
 446#endif
 447                } else {
 448                        fc->sb_flags &= ~SB_POSIXACL;
 449                }
 450                break;
 451        case Opt_wsync:
 452                if (!result.negated)
 453                        fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
 454                else
 455                        fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
 456                break;
 457        default:
 458                BUG();
 459        }
 460        return 0;
 461
 462out_of_range:
 463        return invalfc(fc, "%s out of range", param->key);
 464}
 465
 466static void destroy_mount_options(struct ceph_mount_options *args)
 467{
 468        dout("destroy_mount_options %p\n", args);
 469        if (!args)
 470                return;
 471
 472        kfree(args->snapdir_name);
 473        kfree(args->mds_namespace);
 474        kfree(args->server_path);
 475        kfree(args->fscache_uniq);
 476        kfree(args);
 477}
 478
 479static int strcmp_null(const char *s1, const char *s2)
 480{
 481        if (!s1 && !s2)
 482                return 0;
 483        if (s1 && !s2)
 484                return -1;
 485        if (!s1 && s2)
 486                return 1;
 487        return strcmp(s1, s2);
 488}
 489
 490static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 491                                 struct ceph_options *new_opt,
 492                                 struct ceph_fs_client *fsc)
 493{
 494        struct ceph_mount_options *fsopt1 = new_fsopt;
 495        struct ceph_mount_options *fsopt2 = fsc->mount_options;
 496        int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 497        int ret;
 498
 499        ret = memcmp(fsopt1, fsopt2, ofs);
 500        if (ret)
 501                return ret;
 502
 503        ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 504        if (ret)
 505                return ret;
 506
 507        ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 508        if (ret)
 509                return ret;
 510
 511        ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 512        if (ret)
 513                return ret;
 514
 515        ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
 516        if (ret)
 517                return ret;
 518
 519        return ceph_compare_options(new_opt, fsc->client);
 520}
 521
 522/**
 523 * ceph_show_options - Show mount options in /proc/mounts
 524 * @m: seq_file to write to
 525 * @root: root of that (sub)tree
 526 */
 527static int ceph_show_options(struct seq_file *m, struct dentry *root)
 528{
 529        struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 530        struct ceph_mount_options *fsopt = fsc->mount_options;
 531        size_t pos;
 532        int ret;
 533
 534        /* a comma between MNT/MS and client options */
 535        seq_putc(m, ',');
 536        pos = m->count;
 537
 538        ret = ceph_print_client_options(m, fsc->client, false);
 539        if (ret)
 540                return ret;
 541
 542        /* retract our comma if no client options */
 543        if (m->count == pos)
 544                m->count--;
 545
 546        if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 547                seq_puts(m, ",dirstat");
 548        if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 549                seq_puts(m, ",rbytes");
 550        if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 551                seq_puts(m, ",noasyncreaddir");
 552        if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 553                seq_puts(m, ",nodcache");
 554        if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
 555                seq_puts(m, ",ino32");
 556        if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
 557                seq_show_option(m, "fsc", fsopt->fscache_uniq);
 558        }
 559        if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 560                seq_puts(m, ",nopoolperm");
 561        if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
 562                seq_puts(m, ",noquotadf");
 563
 564#ifdef CONFIG_CEPH_FS_POSIX_ACL
 565        if (root->d_sb->s_flags & SB_POSIXACL)
 566                seq_puts(m, ",acl");
 567        else
 568                seq_puts(m, ",noacl");
 569#endif
 570
 571        if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
 572                seq_puts(m, ",copyfrom");
 573
 574        if (fsopt->mds_namespace)
 575                seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
 576
 577        if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
 578                seq_show_option(m, "recover_session", "clean");
 579
 580        if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
 581                seq_puts(m, ",nowsync");
 582
 583        if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 584                seq_printf(m, ",wsize=%u", fsopt->wsize);
 585        if (fsopt->rsize != CEPH_MAX_READ_SIZE)
 586                seq_printf(m, ",rsize=%u", fsopt->rsize);
 587        if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 588                seq_printf(m, ",rasize=%u", fsopt->rasize);
 589        if (fsopt->congestion_kb != default_congestion_kb())
 590                seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
 591        if (fsopt->caps_max)
 592                seq_printf(m, ",caps_max=%d", fsopt->caps_max);
 593        if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 594                seq_printf(m, ",caps_wanted_delay_min=%u",
 595                         fsopt->caps_wanted_delay_min);
 596        if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 597                seq_printf(m, ",caps_wanted_delay_max=%u",
 598                           fsopt->caps_wanted_delay_max);
 599        if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 600                seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
 601        if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 602                seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
 603        if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 604                seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 605
 606        return 0;
 607}
 608
 609/*
 610 * handle any mon messages the standard library doesn't understand.
 611 * return error if we don't either.
 612 */
 613static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 614{
 615        struct ceph_fs_client *fsc = client->private;
 616        int type = le16_to_cpu(msg->hdr.type);
 617
 618        switch (type) {
 619        case CEPH_MSG_MDS_MAP:
 620                ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 621                return 0;
 622        case CEPH_MSG_FS_MAP_USER:
 623                ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 624                return 0;
 625        default:
 626                return -1;
 627        }
 628}
 629
 630/*
 631 * create a new fs client
 632 *
 633 * Success or not, this function consumes @fsopt and @opt.
 634 */
 635static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 636                                        struct ceph_options *opt)
 637{
 638        struct ceph_fs_client *fsc;
 639        int err;
 640
 641        fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 642        if (!fsc) {
 643                err = -ENOMEM;
 644                goto fail;
 645        }
 646
 647        fsc->client = ceph_create_client(opt, fsc);
 648        if (IS_ERR(fsc->client)) {
 649                err = PTR_ERR(fsc->client);
 650                goto fail;
 651        }
 652        opt = NULL; /* fsc->client now owns this */
 653
 654        fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 655        ceph_set_opt(fsc->client, ABORT_ON_FULL);
 656
 657        if (!fsopt->mds_namespace) {
 658                ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 659                                   0, true);
 660        } else {
 661                ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 662                                   0, false);
 663        }
 664
 665        fsc->mount_options = fsopt;
 666
 667        fsc->sb = NULL;
 668        fsc->mount_state = CEPH_MOUNT_MOUNTING;
 669        fsc->filp_gen = 1;
 670        fsc->have_copy_from2 = true;
 671
 672        atomic_long_set(&fsc->writeback_count, 0);
 673
 674        err = -ENOMEM;
 675        /*
 676         * The number of concurrent works can be high but they don't need
 677         * to be processed in parallel, limit concurrency.
 678         */
 679        fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
 680        if (!fsc->inode_wq)
 681                goto fail_client;
 682        fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
 683        if (!fsc->cap_wq)
 684                goto fail_inode_wq;
 685
 686        spin_lock(&ceph_fsc_lock);
 687        list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
 688        spin_unlock(&ceph_fsc_lock);
 689
 690        return fsc;
 691
 692fail_inode_wq:
 693        destroy_workqueue(fsc->inode_wq);
 694fail_client:
 695        ceph_destroy_client(fsc->client);
 696fail:
 697        kfree(fsc);
 698        if (opt)
 699                ceph_destroy_options(opt);
 700        destroy_mount_options(fsopt);
 701        return ERR_PTR(err);
 702}
 703
 704static void flush_fs_workqueues(struct ceph_fs_client *fsc)
 705{
 706        flush_workqueue(fsc->inode_wq);
 707        flush_workqueue(fsc->cap_wq);
 708}
 709
 710static void destroy_fs_client(struct ceph_fs_client *fsc)
 711{
 712        dout("destroy_fs_client %p\n", fsc);
 713
 714        spin_lock(&ceph_fsc_lock);
 715        list_del(&fsc->metric_wakeup);
 716        spin_unlock(&ceph_fsc_lock);
 717
 718        ceph_mdsc_destroy(fsc);
 719        destroy_workqueue(fsc->inode_wq);
 720        destroy_workqueue(fsc->cap_wq);
 721
 722        destroy_mount_options(fsc->mount_options);
 723
 724        ceph_destroy_client(fsc->client);
 725
 726        kfree(fsc);
 727        dout("destroy_fs_client %p done\n", fsc);
 728}
 729
 730/*
 731 * caches
 732 */
 733struct kmem_cache *ceph_inode_cachep;
 734struct kmem_cache *ceph_cap_cachep;
 735struct kmem_cache *ceph_cap_flush_cachep;
 736struct kmem_cache *ceph_dentry_cachep;
 737struct kmem_cache *ceph_file_cachep;
 738struct kmem_cache *ceph_dir_file_cachep;
 739struct kmem_cache *ceph_mds_request_cachep;
 740mempool_t *ceph_wb_pagevec_pool;
 741
 742static void ceph_inode_init_once(void *foo)
 743{
 744        struct ceph_inode_info *ci = foo;
 745        inode_init_once(&ci->vfs_inode);
 746}
 747
 748static int __init init_caches(void)
 749{
 750        int error = -ENOMEM;
 751
 752        ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 753                                      sizeof(struct ceph_inode_info),
 754                                      __alignof__(struct ceph_inode_info),
 755                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 756                                      SLAB_ACCOUNT, ceph_inode_init_once);
 757        if (!ceph_inode_cachep)
 758                return -ENOMEM;
 759
 760        ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
 761        if (!ceph_cap_cachep)
 762                goto bad_cap;
 763        ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 764                                           SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 765        if (!ceph_cap_flush_cachep)
 766                goto bad_cap_flush;
 767
 768        ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 769                                        SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 770        if (!ceph_dentry_cachep)
 771                goto bad_dentry;
 772
 773        ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 774        if (!ceph_file_cachep)
 775                goto bad_file;
 776
 777        ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
 778        if (!ceph_dir_file_cachep)
 779                goto bad_dir_file;
 780
 781        ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
 782        if (!ceph_mds_request_cachep)
 783                goto bad_mds_req;
 784
 785        ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
 786        if (!ceph_wb_pagevec_pool)
 787                goto bad_pagevec_pool;
 788
 789        error = ceph_fscache_register();
 790        if (error)
 791                goto bad_fscache;
 792
 793        return 0;
 794
 795bad_fscache:
 796        kmem_cache_destroy(ceph_mds_request_cachep);
 797bad_pagevec_pool:
 798        mempool_destroy(ceph_wb_pagevec_pool);
 799bad_mds_req:
 800        kmem_cache_destroy(ceph_dir_file_cachep);
 801bad_dir_file:
 802        kmem_cache_destroy(ceph_file_cachep);
 803bad_file:
 804        kmem_cache_destroy(ceph_dentry_cachep);
 805bad_dentry:
 806        kmem_cache_destroy(ceph_cap_flush_cachep);
 807bad_cap_flush:
 808        kmem_cache_destroy(ceph_cap_cachep);
 809bad_cap:
 810        kmem_cache_destroy(ceph_inode_cachep);
 811        return error;
 812}
 813
 814static void destroy_caches(void)
 815{
 816        /*
 817         * Make sure all delayed rcu free inodes are flushed before we
 818         * destroy cache.
 819         */
 820        rcu_barrier();
 821
 822        kmem_cache_destroy(ceph_inode_cachep);
 823        kmem_cache_destroy(ceph_cap_cachep);
 824        kmem_cache_destroy(ceph_cap_flush_cachep);
 825        kmem_cache_destroy(ceph_dentry_cachep);
 826        kmem_cache_destroy(ceph_file_cachep);
 827        kmem_cache_destroy(ceph_dir_file_cachep);
 828        kmem_cache_destroy(ceph_mds_request_cachep);
 829        mempool_destroy(ceph_wb_pagevec_pool);
 830
 831        ceph_fscache_unregister();
 832}
 833
 834static void __ceph_umount_begin(struct ceph_fs_client *fsc)
 835{
 836        ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 837        ceph_mdsc_force_umount(fsc->mdsc);
 838        fsc->filp_gen++; // invalidate open files
 839}
 840
 841/*
 842 * ceph_umount_begin - initiate forced umount.  Tear down the
 843 * mount, skipping steps that may hang while waiting for server(s).
 844 */
 845static void ceph_umount_begin(struct super_block *sb)
 846{
 847        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 848
 849        dout("ceph_umount_begin - starting forced umount\n");
 850        if (!fsc)
 851                return;
 852        fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 853        __ceph_umount_begin(fsc);
 854}
 855
 856static const struct super_operations ceph_super_ops = {
 857        .alloc_inode    = ceph_alloc_inode,
 858        .free_inode     = ceph_free_inode,
 859        .write_inode    = ceph_write_inode,
 860        .drop_inode     = generic_delete_inode,
 861        .evict_inode    = ceph_evict_inode,
 862        .sync_fs        = ceph_sync_fs,
 863        .put_super      = ceph_put_super,
 864        .show_options   = ceph_show_options,
 865        .statfs         = ceph_statfs,
 866        .umount_begin   = ceph_umount_begin,
 867};
 868
 869/*
 870 * Bootstrap mount by opening the root directory.  Note the mount
 871 * @started time from caller, and time out if this takes too long.
 872 */
 873static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 874                                       const char *path,
 875                                       unsigned long started)
 876{
 877        struct ceph_mds_client *mdsc = fsc->mdsc;
 878        struct ceph_mds_request *req = NULL;
 879        int err;
 880        struct dentry *root;
 881
 882        /* open dir */
 883        dout("open_root_inode opening '%s'\n", path);
 884        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 885        if (IS_ERR(req))
 886                return ERR_CAST(req);
 887        req->r_path1 = kstrdup(path, GFP_NOFS);
 888        if (!req->r_path1) {
 889                root = ERR_PTR(-ENOMEM);
 890                goto out;
 891        }
 892
 893        req->r_ino1.ino = CEPH_INO_ROOT;
 894        req->r_ino1.snap = CEPH_NOSNAP;
 895        req->r_started = started;
 896        req->r_timeout = fsc->client->options->mount_timeout;
 897        req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 898        req->r_num_caps = 2;
 899        err = ceph_mdsc_do_request(mdsc, NULL, req);
 900        if (err == 0) {
 901                struct inode *inode = req->r_target_inode;
 902                req->r_target_inode = NULL;
 903                dout("open_root_inode success\n");
 904                root = d_make_root(inode);
 905                if (!root) {
 906                        root = ERR_PTR(-ENOMEM);
 907                        goto out;
 908                }
 909                dout("open_root_inode success, root dentry is %p\n", root);
 910        } else {
 911                root = ERR_PTR(err);
 912        }
 913out:
 914        ceph_mdsc_put_request(req);
 915        return root;
 916}
 917
 918/*
 919 * mount: join the ceph cluster, and open root directory.
 920 */
 921static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 922                                      struct fs_context *fc)
 923{
 924        int err;
 925        unsigned long started = jiffies;  /* note the start time */
 926        struct dentry *root;
 927
 928        dout("mount start %p\n", fsc);
 929        mutex_lock(&fsc->client->mount_mutex);
 930
 931        if (!fsc->sb->s_root) {
 932                const char *path = fsc->mount_options->server_path ?
 933                                     fsc->mount_options->server_path + 1 : "";
 934
 935                err = __ceph_open_session(fsc->client, started);
 936                if (err < 0)
 937                        goto out;
 938
 939                /* setup fscache */
 940                if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
 941                        err = ceph_fscache_register_fs(fsc, fc);
 942                        if (err < 0)
 943                                goto out;
 944                }
 945
 946                dout("mount opening path '%s'\n", path);
 947
 948                ceph_fs_debugfs_init(fsc);
 949
 950                root = open_root_dentry(fsc, path, started);
 951                if (IS_ERR(root)) {
 952                        err = PTR_ERR(root);
 953                        goto out;
 954                }
 955                fsc->sb->s_root = dget(root);
 956        } else {
 957                root = dget(fsc->sb->s_root);
 958        }
 959
 960        fsc->mount_state = CEPH_MOUNT_MOUNTED;
 961        dout("mount success\n");
 962        mutex_unlock(&fsc->client->mount_mutex);
 963        return root;
 964
 965out:
 966        mutex_unlock(&fsc->client->mount_mutex);
 967        return ERR_PTR(err);
 968}
 969
 970static int ceph_set_super(struct super_block *s, struct fs_context *fc)
 971{
 972        struct ceph_fs_client *fsc = s->s_fs_info;
 973        int ret;
 974
 975        dout("set_super %p\n", s);
 976
 977        s->s_maxbytes = MAX_LFS_FILESIZE;
 978
 979        s->s_xattr = ceph_xattr_handlers;
 980        fsc->sb = s;
 981        fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
 982
 983        s->s_op = &ceph_super_ops;
 984        s->s_d_op = &ceph_dentry_ops;
 985        s->s_export_op = &ceph_export_ops;
 986
 987        s->s_time_gran = 1;
 988        s->s_time_min = 0;
 989        s->s_time_max = U32_MAX;
 990
 991        ret = set_anon_super_fc(s, fc);
 992        if (ret != 0)
 993                fsc->sb = NULL;
 994        return ret;
 995}
 996
 997/*
 998 * share superblock if same fs AND options
 999 */
1000static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
1001{
1002        struct ceph_fs_client *new = fc->s_fs_info;
1003        struct ceph_mount_options *fsopt = new->mount_options;
1004        struct ceph_options *opt = new->client->options;
1005        struct ceph_fs_client *other = ceph_sb_to_client(sb);
1006
1007        dout("ceph_compare_super %p\n", sb);
1008
1009        if (compare_mount_options(fsopt, opt, other)) {
1010                dout("monitor(s)/mount options don't match\n");
1011                return 0;
1012        }
1013        if ((opt->flags & CEPH_OPT_FSID) &&
1014            ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
1015                dout("fsid doesn't match\n");
1016                return 0;
1017        }
1018        if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
1019                dout("flags differ\n");
1020                return 0;
1021        }
1022        return 1;
1023}
1024
1025/*
1026 * construct our own bdi so we can control readahead, etc.
1027 */
1028static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
1029
1030static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
1031{
1032        int err;
1033
1034        err = super_setup_bdi_name(sb, "ceph-%ld",
1035                                   atomic_long_inc_return(&bdi_seq));
1036        if (err)
1037                return err;
1038
1039        /* set ra_pages based on rasize mount option? */
1040        sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
1041
1042        /* set io_pages based on max osd read size */
1043        sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
1044
1045        return 0;
1046}
1047
1048static int ceph_get_tree(struct fs_context *fc)
1049{
1050        struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1051        struct super_block *sb;
1052        struct ceph_fs_client *fsc;
1053        struct dentry *res;
1054        int (*compare_super)(struct super_block *, struct fs_context *) =
1055                ceph_compare_super;
1056        int err;
1057
1058        dout("ceph_get_tree\n");
1059
1060        if (!fc->source)
1061                return invalfc(fc, "No source");
1062
1063        /* create client (which we may/may not use) */
1064        fsc = create_fs_client(pctx->opts, pctx->copts);
1065        pctx->opts = NULL;
1066        pctx->copts = NULL;
1067        if (IS_ERR(fsc)) {
1068                err = PTR_ERR(fsc);
1069                goto out_final;
1070        }
1071
1072        err = ceph_mdsc_init(fsc);
1073        if (err < 0)
1074                goto out;
1075
1076        if (ceph_test_opt(fsc->client, NOSHARE))
1077                compare_super = NULL;
1078
1079        fc->s_fs_info = fsc;
1080        sb = sget_fc(fc, compare_super, ceph_set_super);
1081        fc->s_fs_info = NULL;
1082        if (IS_ERR(sb)) {
1083                err = PTR_ERR(sb);
1084                goto out;
1085        }
1086
1087        if (ceph_sb_to_client(sb) != fsc) {
1088                destroy_fs_client(fsc);
1089                fsc = ceph_sb_to_client(sb);
1090                dout("get_sb got existing client %p\n", fsc);
1091        } else {
1092                dout("get_sb using new client %p\n", fsc);
1093                err = ceph_setup_bdi(sb, fsc);
1094                if (err < 0)
1095                        goto out_splat;
1096        }
1097
1098        res = ceph_real_mount(fsc, fc);
1099        if (IS_ERR(res)) {
1100                err = PTR_ERR(res);
1101                goto out_splat;
1102        }
1103        dout("root %p inode %p ino %llx.%llx\n", res,
1104             d_inode(res), ceph_vinop(d_inode(res)));
1105        fc->root = fsc->sb->s_root;
1106        return 0;
1107
1108out_splat:
1109        if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
1110                pr_info("No mds server is up or the cluster is laggy\n");
1111                err = -EHOSTUNREACH;
1112        }
1113
1114        ceph_mdsc_close_sessions(fsc->mdsc);
1115        deactivate_locked_super(sb);
1116        goto out_final;
1117
1118out:
1119        destroy_fs_client(fsc);
1120out_final:
1121        dout("ceph_get_tree fail %d\n", err);
1122        return err;
1123}
1124
1125static void ceph_free_fc(struct fs_context *fc)
1126{
1127        struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1128
1129        if (pctx) {
1130                destroy_mount_options(pctx->opts);
1131                ceph_destroy_options(pctx->copts);
1132                kfree(pctx);
1133        }
1134}
1135
1136static int ceph_reconfigure_fc(struct fs_context *fc)
1137{
1138        struct ceph_parse_opts_ctx *pctx = fc->fs_private;
1139        struct ceph_mount_options *fsopt = pctx->opts;
1140        struct ceph_fs_client *fsc = ceph_sb_to_client(fc->root->d_sb);
1141
1142        if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
1143                ceph_set_mount_opt(fsc, ASYNC_DIROPS);
1144        else
1145                ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
1146
1147        sync_filesystem(fc->root->d_sb);
1148        return 0;
1149}
1150
1151static const struct fs_context_operations ceph_context_ops = {
1152        .free           = ceph_free_fc,
1153        .parse_param    = ceph_parse_mount_param,
1154        .get_tree       = ceph_get_tree,
1155        .reconfigure    = ceph_reconfigure_fc,
1156};
1157
1158/*
1159 * Set up the filesystem mount context.
1160 */
1161static int ceph_init_fs_context(struct fs_context *fc)
1162{
1163        struct ceph_parse_opts_ctx *pctx;
1164        struct ceph_mount_options *fsopt;
1165
1166        pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
1167        if (!pctx)
1168                return -ENOMEM;
1169
1170        pctx->copts = ceph_alloc_options();
1171        if (!pctx->copts)
1172                goto nomem;
1173
1174        pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
1175        if (!pctx->opts)
1176                goto nomem;
1177
1178        fsopt = pctx->opts;
1179        fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
1180
1181        fsopt->wsize = CEPH_MAX_WRITE_SIZE;
1182        fsopt->rsize = CEPH_MAX_READ_SIZE;
1183        fsopt->rasize = CEPH_RASIZE_DEFAULT;
1184        fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
1185        if (!fsopt->snapdir_name)
1186                goto nomem;
1187
1188        fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
1189        fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
1190        fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
1191        fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
1192        fsopt->congestion_kb = default_congestion_kb();
1193
1194#ifdef CONFIG_CEPH_FS_POSIX_ACL
1195        fc->sb_flags |= SB_POSIXACL;
1196#endif
1197
1198        fc->fs_private = pctx;
1199        fc->ops = &ceph_context_ops;
1200        return 0;
1201
1202nomem:
1203        destroy_mount_options(pctx->opts);
1204        ceph_destroy_options(pctx->copts);
1205        kfree(pctx);
1206        return -ENOMEM;
1207}
1208
1209static void ceph_kill_sb(struct super_block *s)
1210{
1211        struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1212
1213        dout("kill_sb %p\n", s);
1214
1215        ceph_mdsc_pre_umount(fsc->mdsc);
1216        flush_fs_workqueues(fsc);
1217
1218        kill_anon_super(s);
1219
1220        fsc->client->extra_mon_dispatch = NULL;
1221        ceph_fs_debugfs_cleanup(fsc);
1222
1223        ceph_fscache_unregister_fs(fsc);
1224
1225        destroy_fs_client(fsc);
1226}
1227
1228static struct file_system_type ceph_fs_type = {
1229        .owner          = THIS_MODULE,
1230        .name           = "ceph",
1231        .init_fs_context = ceph_init_fs_context,
1232        .kill_sb        = ceph_kill_sb,
1233        .fs_flags       = FS_RENAME_DOES_D_MOVE,
1234};
1235MODULE_ALIAS_FS("ceph");
1236
1237int ceph_force_reconnect(struct super_block *sb)
1238{
1239        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1240        int err = 0;
1241
1242        fsc->mount_state = CEPH_MOUNT_RECOVER;
1243        __ceph_umount_begin(fsc);
1244
1245        /* Make sure all page caches get invalidated.
1246         * see remove_session_caps_cb() */
1247        flush_workqueue(fsc->inode_wq);
1248
1249        /* In case that we were blocklisted. This also reset
1250         * all mon/osd connections */
1251        ceph_reset_client_addr(fsc->client);
1252
1253        ceph_osdc_clear_abort_err(&fsc->client->osdc);
1254
1255        fsc->blocklisted = false;
1256        fsc->mount_state = CEPH_MOUNT_MOUNTED;
1257
1258        if (sb->s_root) {
1259                err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
1260                                        CEPH_STAT_CAP_INODE, true);
1261        }
1262        return err;
1263}
1264
1265static int __init init_ceph(void)
1266{
1267        int ret = init_caches();
1268        if (ret)
1269                goto out;
1270
1271        ceph_flock_init();
1272        ret = register_filesystem(&ceph_fs_type);
1273        if (ret)
1274                goto out_caches;
1275
1276        pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1277
1278        return 0;
1279
1280out_caches:
1281        destroy_caches();
1282out:
1283        return ret;
1284}
1285
1286static void __exit exit_ceph(void)
1287{
1288        dout("exit_ceph\n");
1289        unregister_filesystem(&ceph_fs_type);
1290        destroy_caches();
1291}
1292
1293static int param_set_metrics(const char *val, const struct kernel_param *kp)
1294{
1295        struct ceph_fs_client *fsc;
1296        int ret;
1297
1298        ret = param_set_bool(val, kp);
1299        if (ret) {
1300                pr_err("Failed to parse sending metrics switch value '%s'\n",
1301                       val);
1302                return ret;
1303        } else if (!disable_send_metrics) {
1304                // wake up all the mds clients
1305                spin_lock(&ceph_fsc_lock);
1306                list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
1307                        metric_schedule_delayed(&fsc->mdsc->metric);
1308                }
1309                spin_unlock(&ceph_fsc_lock);
1310        }
1311
1312        return 0;
1313}
1314
1315static const struct kernel_param_ops param_ops_metrics = {
1316        .set = param_set_metrics,
1317        .get = param_get_bool,
1318};
1319
1320bool disable_send_metrics = false;
1321module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
1322MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
1323
1324module_init(init_ceph);
1325module_exit(exit_ceph);
1326
1327MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1328MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1329MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1330MODULE_DESCRIPTION("Ceph filesystem for Linux");
1331MODULE_LICENSE("GPL");
1332