linux/fs/ceph/super.c
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   1
   2#include <linux/ceph/ceph_debug.h>
   3
   4#include <linux/backing-dev.h>
   5#include <linux/ctype.h>
   6#include <linux/fs.h>
   7#include <linux/inet.h>
   8#include <linux/in6.h>
   9#include <linux/module.h>
  10#include <linux/mount.h>
  11#include <linux/parser.h>
  12#include <linux/sched.h>
  13#include <linux/seq_file.h>
  14#include <linux/slab.h>
  15#include <linux/statfs.h>
  16#include <linux/string.h>
  17
  18#include "super.h"
  19#include "mds_client.h"
  20#include "cache.h"
  21
  22#include <linux/ceph/ceph_features.h>
  23#include <linux/ceph/decode.h>
  24#include <linux/ceph/mon_client.h>
  25#include <linux/ceph/auth.h>
  26#include <linux/ceph/debugfs.h>
  27
  28/*
  29 * Ceph superblock operations
  30 *
  31 * Handle the basics of mounting, unmounting.
  32 */
  33
  34/*
  35 * super ops
  36 */
  37static void ceph_put_super(struct super_block *s)
  38{
  39        struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  40
  41        dout("put_super\n");
  42        ceph_mdsc_close_sessions(fsc->mdsc);
  43}
  44
  45static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  46{
  47        struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
  48        struct ceph_monmap *monmap = fsc->client->monc.monmap;
  49        struct ceph_statfs st;
  50        u64 fsid;
  51        int err;
  52
  53        dout("statfs\n");
  54        err = ceph_monc_do_statfs(&fsc->client->monc, &st);
  55        if (err < 0)
  56                return err;
  57
  58        /* fill in kstatfs */
  59        buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  60
  61        /*
  62         * express utilization in terms of large blocks to avoid
  63         * overflow on 32-bit machines.
  64         *
  65         * NOTE: for the time being, we make bsize == frsize to humor
  66         * not-yet-ancient versions of glibc that are broken.
  67         * Someday, we will probably want to report a real block
  68         * size...  whatever that may mean for a network file system!
  69         */
  70        buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  71        buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
  72        buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  73        buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  74        buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  75
  76        buf->f_files = le64_to_cpu(st.num_objects);
  77        buf->f_ffree = -1;
  78        buf->f_namelen = NAME_MAX;
  79
  80        /* leave fsid little-endian, regardless of host endianness */
  81        fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  82        buf->f_fsid.val[0] = fsid & 0xffffffff;
  83        buf->f_fsid.val[1] = fsid >> 32;
  84
  85        return 0;
  86}
  87
  88
  89static int ceph_sync_fs(struct super_block *sb, int wait)
  90{
  91        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
  92
  93        if (!wait) {
  94                dout("sync_fs (non-blocking)\n");
  95                ceph_flush_dirty_caps(fsc->mdsc);
  96                dout("sync_fs (non-blocking) done\n");
  97                return 0;
  98        }
  99
 100        dout("sync_fs (blocking)\n");
 101        ceph_osdc_sync(&fsc->client->osdc);
 102        ceph_mdsc_sync(fsc->mdsc);
 103        dout("sync_fs (blocking) done\n");
 104        return 0;
 105}
 106
 107/*
 108 * mount options
 109 */
 110enum {
 111        Opt_wsize,
 112        Opt_rsize,
 113        Opt_rasize,
 114        Opt_caps_wanted_delay_min,
 115        Opt_caps_wanted_delay_max,
 116        Opt_cap_release_safety,
 117        Opt_readdir_max_entries,
 118        Opt_readdir_max_bytes,
 119        Opt_congestion_kb,
 120        Opt_last_int,
 121        /* int args above */
 122        Opt_snapdirname,
 123        Opt_mds_namespace,
 124        Opt_last_string,
 125        /* string args above */
 126        Opt_dirstat,
 127        Opt_nodirstat,
 128        Opt_rbytes,
 129        Opt_norbytes,
 130        Opt_asyncreaddir,
 131        Opt_noasyncreaddir,
 132        Opt_dcache,
 133        Opt_nodcache,
 134        Opt_ino32,
 135        Opt_noino32,
 136        Opt_fscache,
 137        Opt_nofscache,
 138        Opt_poolperm,
 139        Opt_nopoolperm,
 140        Opt_require_active_mds,
 141        Opt_norequire_active_mds,
 142#ifdef CONFIG_CEPH_FS_POSIX_ACL
 143        Opt_acl,
 144#endif
 145        Opt_noacl,
 146};
 147
 148static match_table_t fsopt_tokens = {
 149        {Opt_wsize, "wsize=%d"},
 150        {Opt_rsize, "rsize=%d"},
 151        {Opt_rasize, "rasize=%d"},
 152        {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 153        {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 154        {Opt_cap_release_safety, "cap_release_safety=%d"},
 155        {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 156        {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 157        {Opt_congestion_kb, "write_congestion_kb=%d"},
 158        /* int args above */
 159        {Opt_snapdirname, "snapdirname=%s"},
 160        {Opt_mds_namespace, "mds_namespace=%s"},
 161        /* string args above */
 162        {Opt_dirstat, "dirstat"},
 163        {Opt_nodirstat, "nodirstat"},
 164        {Opt_rbytes, "rbytes"},
 165        {Opt_norbytes, "norbytes"},
 166        {Opt_asyncreaddir, "asyncreaddir"},
 167        {Opt_noasyncreaddir, "noasyncreaddir"},
 168        {Opt_dcache, "dcache"},
 169        {Opt_nodcache, "nodcache"},
 170        {Opt_ino32, "ino32"},
 171        {Opt_noino32, "noino32"},
 172        {Opt_fscache, "fsc"},
 173        {Opt_nofscache, "nofsc"},
 174        {Opt_poolperm, "poolperm"},
 175        {Opt_nopoolperm, "nopoolperm"},
 176        {Opt_require_active_mds, "require_active_mds"},
 177        {Opt_norequire_active_mds, "norequire_active_mds"},
 178#ifdef CONFIG_CEPH_FS_POSIX_ACL
 179        {Opt_acl, "acl"},
 180#endif
 181        {Opt_noacl, "noacl"},
 182        {-1, NULL}
 183};
 184
 185static int parse_fsopt_token(char *c, void *private)
 186{
 187        struct ceph_mount_options *fsopt = private;
 188        substring_t argstr[MAX_OPT_ARGS];
 189        int token, intval, ret;
 190
 191        token = match_token((char *)c, fsopt_tokens, argstr);
 192        if (token < 0)
 193                return -EINVAL;
 194
 195        if (token < Opt_last_int) {
 196                ret = match_int(&argstr[0], &intval);
 197                if (ret < 0) {
 198                        pr_err("bad mount option arg (not int) "
 199                               "at '%s'\n", c);
 200                        return ret;
 201                }
 202                dout("got int token %d val %d\n", token, intval);
 203        } else if (token > Opt_last_int && token < Opt_last_string) {
 204                dout("got string token %d val %s\n", token,
 205                     argstr[0].from);
 206        } else {
 207                dout("got token %d\n", token);
 208        }
 209
 210        switch (token) {
 211        case Opt_snapdirname:
 212                kfree(fsopt->snapdir_name);
 213                fsopt->snapdir_name = kstrndup(argstr[0].from,
 214                                               argstr[0].to-argstr[0].from,
 215                                               GFP_KERNEL);
 216                if (!fsopt->snapdir_name)
 217                        return -ENOMEM;
 218                break;
 219        case Opt_mds_namespace:
 220                fsopt->mds_namespace = kstrndup(argstr[0].from,
 221                                                argstr[0].to-argstr[0].from,
 222                                                GFP_KERNEL);
 223                if (!fsopt->mds_namespace)
 224                        return -ENOMEM;
 225                break;
 226                /* misc */
 227        case Opt_wsize:
 228                fsopt->wsize = intval;
 229                break;
 230        case Opt_rsize:
 231                fsopt->rsize = intval;
 232                break;
 233        case Opt_rasize:
 234                fsopt->rasize = intval;
 235                break;
 236        case Opt_caps_wanted_delay_min:
 237                fsopt->caps_wanted_delay_min = intval;
 238                break;
 239        case Opt_caps_wanted_delay_max:
 240                fsopt->caps_wanted_delay_max = intval;
 241                break;
 242        case Opt_readdir_max_entries:
 243                fsopt->max_readdir = intval;
 244                break;
 245        case Opt_readdir_max_bytes:
 246                fsopt->max_readdir_bytes = intval;
 247                break;
 248        case Opt_congestion_kb:
 249                fsopt->congestion_kb = intval;
 250                break;
 251        case Opt_dirstat:
 252                fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 253                break;
 254        case Opt_nodirstat:
 255                fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 256                break;
 257        case Opt_rbytes:
 258                fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 259                break;
 260        case Opt_norbytes:
 261                fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 262                break;
 263        case Opt_asyncreaddir:
 264                fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 265                break;
 266        case Opt_noasyncreaddir:
 267                fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 268                break;
 269        case Opt_dcache:
 270                fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 271                break;
 272        case Opt_nodcache:
 273                fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 274                break;
 275        case Opt_ino32:
 276                fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 277                break;
 278        case Opt_noino32:
 279                fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 280                break;
 281        case Opt_fscache:
 282                fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 283                break;
 284        case Opt_nofscache:
 285                fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 286                break;
 287        case Opt_poolperm:
 288                fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 289                printk ("pool perm");
 290                break;
 291        case Opt_nopoolperm:
 292                fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 293                break;
 294        case Opt_require_active_mds:
 295                fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
 296                break;
 297        case Opt_norequire_active_mds:
 298                fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
 299                break;
 300#ifdef CONFIG_CEPH_FS_POSIX_ACL
 301        case Opt_acl:
 302                fsopt->sb_flags |= MS_POSIXACL;
 303                break;
 304#endif
 305        case Opt_noacl:
 306                fsopt->sb_flags &= ~MS_POSIXACL;
 307                break;
 308        default:
 309                BUG_ON(token);
 310        }
 311        return 0;
 312}
 313
 314static void destroy_mount_options(struct ceph_mount_options *args)
 315{
 316        dout("destroy_mount_options %p\n", args);
 317        kfree(args->snapdir_name);
 318        kfree(args->mds_namespace);
 319        kfree(args->server_path);
 320        kfree(args);
 321}
 322
 323static int strcmp_null(const char *s1, const char *s2)
 324{
 325        if (!s1 && !s2)
 326                return 0;
 327        if (s1 && !s2)
 328                return -1;
 329        if (!s1 && s2)
 330                return 1;
 331        return strcmp(s1, s2);
 332}
 333
 334static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 335                                 struct ceph_options *new_opt,
 336                                 struct ceph_fs_client *fsc)
 337{
 338        struct ceph_mount_options *fsopt1 = new_fsopt;
 339        struct ceph_mount_options *fsopt2 = fsc->mount_options;
 340        int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 341        int ret;
 342
 343        ret = memcmp(fsopt1, fsopt2, ofs);
 344        if (ret)
 345                return ret;
 346
 347        ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 348        if (ret)
 349                return ret;
 350        ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 351        if (ret)
 352                return ret;
 353
 354        ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 355        if (ret)
 356                return ret;
 357
 358        return ceph_compare_options(new_opt, fsc->client);
 359}
 360
 361static int parse_mount_options(struct ceph_mount_options **pfsopt,
 362                               struct ceph_options **popt,
 363                               int flags, char *options,
 364                               const char *dev_name)
 365{
 366        struct ceph_mount_options *fsopt;
 367        const char *dev_name_end;
 368        int err;
 369
 370        if (!dev_name || !*dev_name)
 371                return -EINVAL;
 372
 373        fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 374        if (!fsopt)
 375                return -ENOMEM;
 376
 377        dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 378
 379        fsopt->sb_flags = flags;
 380        fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 381
 382        fsopt->rsize = CEPH_RSIZE_DEFAULT;
 383        fsopt->rasize = CEPH_RASIZE_DEFAULT;
 384        fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 385        if (!fsopt->snapdir_name) {
 386                err = -ENOMEM;
 387                goto out;
 388        }
 389
 390        fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 391        fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 392        fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
 393        fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 394        fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 395        fsopt->congestion_kb = default_congestion_kb();
 396
 397        /*
 398         * Distinguish the server list from the path in "dev_name".
 399         * Internally we do not include the leading '/' in the path.
 400         *
 401         * "dev_name" will look like:
 402         *     <server_spec>[,<server_spec>...]:[<path>]
 403         * where
 404         *     <server_spec> is <ip>[:<port>]
 405         *     <path> is optional, but if present must begin with '/'
 406         */
 407        dev_name_end = strchr(dev_name, '/');
 408        if (dev_name_end) {
 409                if (strlen(dev_name_end) > 1) {
 410                        fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 411                        if (!fsopt->server_path) {
 412                                err = -ENOMEM;
 413                                goto out;
 414                        }
 415                }
 416        } else {
 417                dev_name_end = dev_name + strlen(dev_name);
 418        }
 419        err = -EINVAL;
 420        dev_name_end--;         /* back up to ':' separator */
 421        if (dev_name_end < dev_name || *dev_name_end != ':') {
 422                pr_err("device name is missing path (no : separator in %s)\n",
 423                                dev_name);
 424                goto out;
 425        }
 426        dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 427        if (fsopt->server_path)
 428                dout("server path '%s'\n", fsopt->server_path);
 429
 430        *popt = ceph_parse_options(options, dev_name, dev_name_end,
 431                                 parse_fsopt_token, (void *)fsopt);
 432        if (IS_ERR(*popt)) {
 433                err = PTR_ERR(*popt);
 434                goto out;
 435        }
 436
 437        /* success */
 438        *pfsopt = fsopt;
 439        return 0;
 440
 441out:
 442        destroy_mount_options(fsopt);
 443        return err;
 444}
 445
 446/**
 447 * ceph_show_options - Show mount options in /proc/mounts
 448 * @m: seq_file to write to
 449 * @root: root of that (sub)tree
 450 */
 451static int ceph_show_options(struct seq_file *m, struct dentry *root)
 452{
 453        struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 454        struct ceph_mount_options *fsopt = fsc->mount_options;
 455        size_t pos;
 456        int ret;
 457
 458        /* a comma between MNT/MS and client options */
 459        seq_putc(m, ',');
 460        pos = m->count;
 461
 462        ret = ceph_print_client_options(m, fsc->client);
 463        if (ret)
 464                return ret;
 465
 466        /* retract our comma if no client options */
 467        if (m->count == pos)
 468                m->count--;
 469
 470        if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 471                seq_puts(m, ",dirstat");
 472        if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 473                seq_puts(m, ",rbytes");
 474        if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 475                seq_puts(m, ",noasyncreaddir");
 476        if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 477                seq_puts(m, ",nodcache");
 478        if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
 479                seq_puts(m, ",fsc");
 480        if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 481                seq_puts(m, ",nopoolperm");
 482
 483#ifdef CONFIG_CEPH_FS_POSIX_ACL
 484        if (fsopt->sb_flags & MS_POSIXACL)
 485                seq_puts(m, ",acl");
 486        else
 487                seq_puts(m, ",noacl");
 488#endif
 489
 490        if (fsopt->mds_namespace)
 491                seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
 492        if (fsopt->wsize)
 493                seq_printf(m, ",wsize=%d", fsopt->wsize);
 494        if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
 495                seq_printf(m, ",rsize=%d", fsopt->rsize);
 496        if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 497                seq_printf(m, ",rasize=%d", fsopt->rasize);
 498        if (fsopt->congestion_kb != default_congestion_kb())
 499                seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 500        if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 501                seq_printf(m, ",caps_wanted_delay_min=%d",
 502                         fsopt->caps_wanted_delay_min);
 503        if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 504                seq_printf(m, ",caps_wanted_delay_max=%d",
 505                           fsopt->caps_wanted_delay_max);
 506        if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 507                seq_printf(m, ",cap_release_safety=%d",
 508                           fsopt->cap_release_safety);
 509        if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 510                seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 511        if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 512                seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 513        if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 514                seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 515
 516        return 0;
 517}
 518
 519/*
 520 * handle any mon messages the standard library doesn't understand.
 521 * return error if we don't either.
 522 */
 523static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 524{
 525        struct ceph_fs_client *fsc = client->private;
 526        int type = le16_to_cpu(msg->hdr.type);
 527
 528        switch (type) {
 529        case CEPH_MSG_MDS_MAP:
 530                ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 531                return 0;
 532        case CEPH_MSG_FS_MAP_USER:
 533                ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 534                return 0;
 535        default:
 536                return -1;
 537        }
 538}
 539
 540/*
 541 * create a new fs client
 542 */
 543static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 544                                        struct ceph_options *opt)
 545{
 546        struct ceph_fs_client *fsc;
 547        const u64 supported_features =
 548                CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
 549                CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
 550        const u64 required_features = 0;
 551        int page_count;
 552        size_t size;
 553        int err = -ENOMEM;
 554
 555        fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 556        if (!fsc)
 557                return ERR_PTR(-ENOMEM);
 558
 559        fsc->client = ceph_create_client(opt, fsc, supported_features,
 560                                         required_features);
 561        if (IS_ERR(fsc->client)) {
 562                err = PTR_ERR(fsc->client);
 563                goto fail;
 564        }
 565        fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 566
 567        if (fsopt->mds_namespace == NULL) {
 568                ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 569                                   0, true);
 570        } else {
 571                ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 572                                   0, false);
 573        }
 574
 575        fsc->mount_options = fsopt;
 576
 577        fsc->sb = NULL;
 578        fsc->mount_state = CEPH_MOUNT_MOUNTING;
 579
 580        atomic_long_set(&fsc->writeback_count, 0);
 581
 582        err = bdi_init(&fsc->backing_dev_info);
 583        if (err < 0)
 584                goto fail_client;
 585
 586        err = -ENOMEM;
 587        /*
 588         * The number of concurrent works can be high but they don't need
 589         * to be processed in parallel, limit concurrency.
 590         */
 591        fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 592        if (fsc->wb_wq == NULL)
 593                goto fail_bdi;
 594        fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 595        if (fsc->pg_inv_wq == NULL)
 596                goto fail_wb_wq;
 597        fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 598        if (fsc->trunc_wq == NULL)
 599                goto fail_pg_inv_wq;
 600
 601        /* set up mempools */
 602        err = -ENOMEM;
 603        page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 604        size = sizeof (struct page *) * (page_count ? page_count : 1);
 605        fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 606        if (!fsc->wb_pagevec_pool)
 607                goto fail_trunc_wq;
 608
 609        /* setup fscache */
 610        if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
 611            (ceph_fscache_register_fs(fsc) != 0))
 612                goto fail_fscache;
 613
 614        /* caps */
 615        fsc->min_caps = fsopt->max_readdir;
 616
 617        return fsc;
 618
 619fail_fscache:
 620        ceph_fscache_unregister_fs(fsc);
 621fail_trunc_wq:
 622        destroy_workqueue(fsc->trunc_wq);
 623fail_pg_inv_wq:
 624        destroy_workqueue(fsc->pg_inv_wq);
 625fail_wb_wq:
 626        destroy_workqueue(fsc->wb_wq);
 627fail_bdi:
 628        bdi_destroy(&fsc->backing_dev_info);
 629fail_client:
 630        ceph_destroy_client(fsc->client);
 631fail:
 632        kfree(fsc);
 633        return ERR_PTR(err);
 634}
 635
 636static void destroy_fs_client(struct ceph_fs_client *fsc)
 637{
 638        dout("destroy_fs_client %p\n", fsc);
 639
 640        ceph_fscache_unregister_fs(fsc);
 641
 642        destroy_workqueue(fsc->wb_wq);
 643        destroy_workqueue(fsc->pg_inv_wq);
 644        destroy_workqueue(fsc->trunc_wq);
 645
 646        bdi_destroy(&fsc->backing_dev_info);
 647
 648        mempool_destroy(fsc->wb_pagevec_pool);
 649
 650        destroy_mount_options(fsc->mount_options);
 651
 652        ceph_fs_debugfs_cleanup(fsc);
 653
 654        ceph_destroy_client(fsc->client);
 655
 656        kfree(fsc);
 657        dout("destroy_fs_client %p done\n", fsc);
 658}
 659
 660/*
 661 * caches
 662 */
 663struct kmem_cache *ceph_inode_cachep;
 664struct kmem_cache *ceph_cap_cachep;
 665struct kmem_cache *ceph_cap_flush_cachep;
 666struct kmem_cache *ceph_dentry_cachep;
 667struct kmem_cache *ceph_file_cachep;
 668
 669static void ceph_inode_init_once(void *foo)
 670{
 671        struct ceph_inode_info *ci = foo;
 672        inode_init_once(&ci->vfs_inode);
 673}
 674
 675static int __init init_caches(void)
 676{
 677        int error = -ENOMEM;
 678
 679        ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 680                                      sizeof(struct ceph_inode_info),
 681                                      __alignof__(struct ceph_inode_info),
 682                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 683                                      SLAB_ACCOUNT, ceph_inode_init_once);
 684        if (ceph_inode_cachep == NULL)
 685                return -ENOMEM;
 686
 687        ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 688                                     SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 689        if (ceph_cap_cachep == NULL)
 690                goto bad_cap;
 691        ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 692                                           SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 693        if (ceph_cap_flush_cachep == NULL)
 694                goto bad_cap_flush;
 695
 696        ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 697                                        SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 698        if (ceph_dentry_cachep == NULL)
 699                goto bad_dentry;
 700
 701        ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 702
 703        if (ceph_file_cachep == NULL)
 704                goto bad_file;
 705
 706        if ((error = ceph_fscache_register()))
 707                goto bad_file;
 708
 709        return 0;
 710bad_file:
 711        kmem_cache_destroy(ceph_dentry_cachep);
 712bad_dentry:
 713        kmem_cache_destroy(ceph_cap_flush_cachep);
 714bad_cap_flush:
 715        kmem_cache_destroy(ceph_cap_cachep);
 716bad_cap:
 717        kmem_cache_destroy(ceph_inode_cachep);
 718        return error;
 719}
 720
 721static void destroy_caches(void)
 722{
 723        /*
 724         * Make sure all delayed rcu free inodes are flushed before we
 725         * destroy cache.
 726         */
 727        rcu_barrier();
 728
 729        kmem_cache_destroy(ceph_inode_cachep);
 730        kmem_cache_destroy(ceph_cap_cachep);
 731        kmem_cache_destroy(ceph_cap_flush_cachep);
 732        kmem_cache_destroy(ceph_dentry_cachep);
 733        kmem_cache_destroy(ceph_file_cachep);
 734
 735        ceph_fscache_unregister();
 736}
 737
 738
 739/*
 740 * ceph_umount_begin - initiate forced umount.  Tear down down the
 741 * mount, skipping steps that may hang while waiting for server(s).
 742 */
 743static void ceph_umount_begin(struct super_block *sb)
 744{
 745        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 746
 747        dout("ceph_umount_begin - starting forced umount\n");
 748        if (!fsc)
 749                return;
 750        fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 751        ceph_mdsc_force_umount(fsc->mdsc);
 752        return;
 753}
 754
 755static const struct super_operations ceph_super_ops = {
 756        .alloc_inode    = ceph_alloc_inode,
 757        .destroy_inode  = ceph_destroy_inode,
 758        .write_inode    = ceph_write_inode,
 759        .drop_inode     = ceph_drop_inode,
 760        .evict_inode    = ceph_evict_inode,
 761        .sync_fs        = ceph_sync_fs,
 762        .put_super      = ceph_put_super,
 763        .show_options   = ceph_show_options,
 764        .statfs         = ceph_statfs,
 765        .umount_begin   = ceph_umount_begin,
 766};
 767
 768/*
 769 * Bootstrap mount by opening the root directory.  Note the mount
 770 * @started time from caller, and time out if this takes too long.
 771 */
 772static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 773                                       const char *path,
 774                                       unsigned long started)
 775{
 776        struct ceph_mds_client *mdsc = fsc->mdsc;
 777        struct ceph_mds_request *req = NULL;
 778        int err;
 779        struct dentry *root;
 780
 781        /* open dir */
 782        dout("open_root_inode opening '%s'\n", path);
 783        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 784        if (IS_ERR(req))
 785                return ERR_CAST(req);
 786        req->r_path1 = kstrdup(path, GFP_NOFS);
 787        if (!req->r_path1) {
 788                root = ERR_PTR(-ENOMEM);
 789                goto out;
 790        }
 791
 792        req->r_ino1.ino = CEPH_INO_ROOT;
 793        req->r_ino1.snap = CEPH_NOSNAP;
 794        req->r_started = started;
 795        req->r_timeout = fsc->client->options->mount_timeout;
 796        req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 797        req->r_num_caps = 2;
 798        err = ceph_mdsc_do_request(mdsc, NULL, req);
 799        if (err == 0) {
 800                struct inode *inode = req->r_target_inode;
 801                req->r_target_inode = NULL;
 802                dout("open_root_inode success\n");
 803                root = d_make_root(inode);
 804                if (!root) {
 805                        root = ERR_PTR(-ENOMEM);
 806                        goto out;
 807                }
 808                dout("open_root_inode success, root dentry is %p\n", root);
 809        } else {
 810                root = ERR_PTR(err);
 811        }
 812out:
 813        ceph_mdsc_put_request(req);
 814        return root;
 815}
 816
 817
 818
 819
 820/*
 821 * mount: join the ceph cluster, and open root directory.
 822 */
 823static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 824{
 825        int err;
 826        unsigned long started = jiffies;  /* note the start time */
 827        struct dentry *root;
 828        int first = 0;   /* first vfsmount for this super_block */
 829
 830        dout("mount start %p\n", fsc);
 831        mutex_lock(&fsc->client->mount_mutex);
 832
 833        if (!fsc->sb->s_root) {
 834                const char *path;
 835                err = __ceph_open_session(fsc->client, started);
 836                if (err < 0)
 837                        goto out;
 838
 839                if (!fsc->mount_options->server_path) {
 840                        path = "";
 841                        dout("mount opening path \\t\n");
 842                } else {
 843                        path = fsc->mount_options->server_path + 1;
 844                        dout("mount opening path %s\n", path);
 845                }
 846                root = open_root_dentry(fsc, path, started);
 847                if (IS_ERR(root)) {
 848                        err = PTR_ERR(root);
 849                        goto out;
 850                }
 851                fsc->sb->s_root = dget(root);
 852                first = 1;
 853
 854                err = ceph_fs_debugfs_init(fsc);
 855                if (err < 0)
 856                        goto fail;
 857        } else {
 858                root = dget(fsc->sb->s_root);
 859        }
 860
 861        fsc->mount_state = CEPH_MOUNT_MOUNTED;
 862        dout("mount success\n");
 863        mutex_unlock(&fsc->client->mount_mutex);
 864        return root;
 865
 866fail:
 867        if (first) {
 868                dput(fsc->sb->s_root);
 869                fsc->sb->s_root = NULL;
 870        }
 871out:
 872        mutex_unlock(&fsc->client->mount_mutex);
 873        return ERR_PTR(err);
 874}
 875
 876static int ceph_set_super(struct super_block *s, void *data)
 877{
 878        struct ceph_fs_client *fsc = data;
 879        int ret;
 880
 881        dout("set_super %p data %p\n", s, data);
 882
 883        s->s_flags = fsc->mount_options->sb_flags;
 884        s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 885
 886        s->s_xattr = ceph_xattr_handlers;
 887        s->s_fs_info = fsc;
 888        fsc->sb = s;
 889
 890        s->s_op = &ceph_super_ops;
 891        s->s_d_op = &ceph_dentry_ops;
 892        s->s_export_op = &ceph_export_ops;
 893
 894        s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 895
 896        ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 897        if (ret != 0)
 898                goto fail;
 899
 900        return ret;
 901
 902fail:
 903        s->s_fs_info = NULL;
 904        fsc->sb = NULL;
 905        return ret;
 906}
 907
 908/*
 909 * share superblock if same fs AND options
 910 */
 911static int ceph_compare_super(struct super_block *sb, void *data)
 912{
 913        struct ceph_fs_client *new = data;
 914        struct ceph_mount_options *fsopt = new->mount_options;
 915        struct ceph_options *opt = new->client->options;
 916        struct ceph_fs_client *other = ceph_sb_to_client(sb);
 917
 918        dout("ceph_compare_super %p\n", sb);
 919
 920        if (compare_mount_options(fsopt, opt, other)) {
 921                dout("monitor(s)/mount options don't match\n");
 922                return 0;
 923        }
 924        if ((opt->flags & CEPH_OPT_FSID) &&
 925            ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 926                dout("fsid doesn't match\n");
 927                return 0;
 928        }
 929        if (fsopt->sb_flags != other->mount_options->sb_flags) {
 930                dout("flags differ\n");
 931                return 0;
 932        }
 933        return 1;
 934}
 935
 936/*
 937 * construct our own bdi so we can control readahead, etc.
 938 */
 939static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 940
 941static int ceph_register_bdi(struct super_block *sb,
 942                             struct ceph_fs_client *fsc)
 943{
 944        int err;
 945
 946        /* set ra_pages based on rasize mount option? */
 947        if (fsc->mount_options->rasize >= PAGE_SIZE)
 948                fsc->backing_dev_info.ra_pages =
 949                        (fsc->mount_options->rasize + PAGE_SIZE - 1)
 950                        >> PAGE_SHIFT;
 951        else
 952                fsc->backing_dev_info.ra_pages =
 953                        VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
 954
 955        err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
 956                           atomic_long_inc_return(&bdi_seq));
 957        if (!err)
 958                sb->s_bdi = &fsc->backing_dev_info;
 959        return err;
 960}
 961
 962static struct dentry *ceph_mount(struct file_system_type *fs_type,
 963                       int flags, const char *dev_name, void *data)
 964{
 965        struct super_block *sb;
 966        struct ceph_fs_client *fsc;
 967        struct dentry *res;
 968        int err;
 969        int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 970        struct ceph_mount_options *fsopt = NULL;
 971        struct ceph_options *opt = NULL;
 972
 973        dout("ceph_mount\n");
 974
 975#ifdef CONFIG_CEPH_FS_POSIX_ACL
 976        flags |= MS_POSIXACL;
 977#endif
 978        err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
 979        if (err < 0) {
 980                res = ERR_PTR(err);
 981                goto out_final;
 982        }
 983
 984        /* create client (which we may/may not use) */
 985        fsc = create_fs_client(fsopt, opt);
 986        if (IS_ERR(fsc)) {
 987                res = ERR_CAST(fsc);
 988                destroy_mount_options(fsopt);
 989                ceph_destroy_options(opt);
 990                goto out_final;
 991        }
 992
 993        err = ceph_mdsc_init(fsc);
 994        if (err < 0) {
 995                res = ERR_PTR(err);
 996                goto out;
 997        }
 998
 999        if (ceph_test_opt(fsc->client, NOSHARE))
1000                compare_super = NULL;
1001        sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
1002        if (IS_ERR(sb)) {
1003                res = ERR_CAST(sb);
1004                goto out;
1005        }
1006
1007        if (ceph_sb_to_client(sb) != fsc) {
1008                ceph_mdsc_destroy(fsc);
1009                destroy_fs_client(fsc);
1010                fsc = ceph_sb_to_client(sb);
1011                dout("get_sb got existing client %p\n", fsc);
1012        } else {
1013                dout("get_sb using new client %p\n", fsc);
1014                err = ceph_register_bdi(sb, fsc);
1015                if (err < 0) {
1016                        res = ERR_PTR(err);
1017                        goto out_splat;
1018                }
1019        }
1020
1021        res = ceph_real_mount(fsc);
1022        if (IS_ERR(res))
1023                goto out_splat;
1024        dout("root %p inode %p ino %llx.%llx\n", res,
1025             d_inode(res), ceph_vinop(d_inode(res)));
1026        return res;
1027
1028out_splat:
1029        ceph_mdsc_close_sessions(fsc->mdsc);
1030        deactivate_locked_super(sb);
1031        goto out_final;
1032
1033out:
1034        ceph_mdsc_destroy(fsc);
1035        destroy_fs_client(fsc);
1036out_final:
1037        dout("ceph_mount fail %ld\n", PTR_ERR(res));
1038        return res;
1039}
1040
1041static void ceph_kill_sb(struct super_block *s)
1042{
1043        struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1044        dev_t dev = s->s_dev;
1045
1046        dout("kill_sb %p\n", s);
1047
1048        ceph_mdsc_pre_umount(fsc->mdsc);
1049        generic_shutdown_super(s);
1050        ceph_mdsc_destroy(fsc);
1051
1052        destroy_fs_client(fsc);
1053        free_anon_bdev(dev);
1054}
1055
1056static struct file_system_type ceph_fs_type = {
1057        .owner          = THIS_MODULE,
1058        .name           = "ceph",
1059        .mount          = ceph_mount,
1060        .kill_sb        = ceph_kill_sb,
1061        .fs_flags       = FS_RENAME_DOES_D_MOVE,
1062};
1063MODULE_ALIAS_FS("ceph");
1064
1065static int __init init_ceph(void)
1066{
1067        int ret = init_caches();
1068        if (ret)
1069                goto out;
1070
1071        ceph_flock_init();
1072        ceph_xattr_init();
1073        ret = register_filesystem(&ceph_fs_type);
1074        if (ret)
1075                goto out_xattr;
1076
1077        pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1078
1079        return 0;
1080
1081out_xattr:
1082        ceph_xattr_exit();
1083        destroy_caches();
1084out:
1085        return ret;
1086}
1087
1088static void __exit exit_ceph(void)
1089{
1090        dout("exit_ceph\n");
1091        unregister_filesystem(&ceph_fs_type);
1092        ceph_xattr_exit();
1093        destroy_caches();
1094}
1095
1096module_init(init_ceph);
1097module_exit(exit_ceph);
1098
1099MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1100MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1101MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1102MODULE_DESCRIPTION("Ceph filesystem for Linux");
1103MODULE_LICENSE("GPL");
1104
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