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