linux/fs/ceph/super.c
<<
>>
Prefs
   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#ifdef CONFIG_CEPH_FS_POSIX_ACL
 141        Opt_acl,
 142#endif
 143        Opt_noacl,
 144};
 145
 146static match_table_t fsopt_tokens = {
 147        {Opt_wsize, "wsize=%d"},
 148        {Opt_rsize, "rsize=%d"},
 149        {Opt_rasize, "rasize=%d"},
 150        {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 151        {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 152        {Opt_cap_release_safety, "cap_release_safety=%d"},
 153        {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 154        {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 155        {Opt_congestion_kb, "write_congestion_kb=%d"},
 156        /* int args above */
 157        {Opt_snapdirname, "snapdirname=%s"},
 158        {Opt_mds_namespace, "mds_namespace=%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        case Opt_mds_namespace:
 216                fsopt->mds_namespace = kstrndup(argstr[0].from,
 217                                                argstr[0].to-argstr[0].from,
 218                                                GFP_KERNEL);
 219                if (!fsopt->mds_namespace)
 220                        return -ENOMEM;
 221                break;
 222                /* misc */
 223        case Opt_wsize:
 224                fsopt->wsize = intval;
 225                break;
 226        case Opt_rsize:
 227                fsopt->rsize = intval;
 228                break;
 229        case Opt_rasize:
 230                fsopt->rasize = intval;
 231                break;
 232        case Opt_caps_wanted_delay_min:
 233                fsopt->caps_wanted_delay_min = intval;
 234                break;
 235        case Opt_caps_wanted_delay_max:
 236                fsopt->caps_wanted_delay_max = intval;
 237                break;
 238        case Opt_readdir_max_entries:
 239                fsopt->max_readdir = intval;
 240                break;
 241        case Opt_readdir_max_bytes:
 242                fsopt->max_readdir_bytes = intval;
 243                break;
 244        case Opt_congestion_kb:
 245                fsopt->congestion_kb = intval;
 246                break;
 247        case Opt_dirstat:
 248                fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 249                break;
 250        case Opt_nodirstat:
 251                fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 252                break;
 253        case Opt_rbytes:
 254                fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 255                break;
 256        case Opt_norbytes:
 257                fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 258                break;
 259        case Opt_asyncreaddir:
 260                fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 261                break;
 262        case Opt_noasyncreaddir:
 263                fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 264                break;
 265        case Opt_dcache:
 266                fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 267                break;
 268        case Opt_nodcache:
 269                fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 270                break;
 271        case Opt_ino32:
 272                fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 273                break;
 274        case Opt_noino32:
 275                fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 276                break;
 277        case Opt_fscache:
 278                fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
 279                break;
 280        case Opt_nofscache:
 281                fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
 282                break;
 283        case Opt_poolperm:
 284                fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
 285                printk ("pool perm");
 286                break;
 287        case Opt_nopoolperm:
 288                fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
 289                break;
 290#ifdef CONFIG_CEPH_FS_POSIX_ACL
 291        case Opt_acl:
 292                fsopt->sb_flags |= MS_POSIXACL;
 293                break;
 294#endif
 295        case Opt_noacl:
 296                fsopt->sb_flags &= ~MS_POSIXACL;
 297                break;
 298        default:
 299                BUG_ON(token);
 300        }
 301        return 0;
 302}
 303
 304static void destroy_mount_options(struct ceph_mount_options *args)
 305{
 306        dout("destroy_mount_options %p\n", args);
 307        kfree(args->snapdir_name);
 308        kfree(args->mds_namespace);
 309        kfree(args->server_path);
 310        kfree(args);
 311}
 312
 313static int strcmp_null(const char *s1, const char *s2)
 314{
 315        if (!s1 && !s2)
 316                return 0;
 317        if (s1 && !s2)
 318                return -1;
 319        if (!s1 && s2)
 320                return 1;
 321        return strcmp(s1, s2);
 322}
 323
 324static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 325                                 struct ceph_options *new_opt,
 326                                 struct ceph_fs_client *fsc)
 327{
 328        struct ceph_mount_options *fsopt1 = new_fsopt;
 329        struct ceph_mount_options *fsopt2 = fsc->mount_options;
 330        int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 331        int ret;
 332
 333        ret = memcmp(fsopt1, fsopt2, ofs);
 334        if (ret)
 335                return ret;
 336
 337        ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 338        if (ret)
 339                return ret;
 340        ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
 341        if (ret)
 342                return ret;
 343
 344        ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
 345        if (ret)
 346                return ret;
 347
 348        return ceph_compare_options(new_opt, fsc->client);
 349}
 350
 351static int parse_mount_options(struct ceph_mount_options **pfsopt,
 352                               struct ceph_options **popt,
 353                               int flags, char *options,
 354                               const char *dev_name)
 355{
 356        struct ceph_mount_options *fsopt;
 357        const char *dev_name_end;
 358        int err;
 359
 360        if (!dev_name || !*dev_name)
 361                return -EINVAL;
 362
 363        fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 364        if (!fsopt)
 365                return -ENOMEM;
 366
 367        dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 368
 369        fsopt->sb_flags = flags;
 370        fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 371
 372        fsopt->rsize = CEPH_RSIZE_DEFAULT;
 373        fsopt->rasize = CEPH_RASIZE_DEFAULT;
 374        fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 375        if (!fsopt->snapdir_name) {
 376                err = -ENOMEM;
 377                goto out;
 378        }
 379
 380        fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 381        fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 382        fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
 383        fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 384        fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 385        fsopt->congestion_kb = default_congestion_kb();
 386
 387        /*
 388         * Distinguish the server list from the path in "dev_name".
 389         * Internally we do not include the leading '/' in the path.
 390         *
 391         * "dev_name" will look like:
 392         *     <server_spec>[,<server_spec>...]:[<path>]
 393         * where
 394         *     <server_spec> is <ip>[:<port>]
 395         *     <path> is optional, but if present must begin with '/'
 396         */
 397        dev_name_end = strchr(dev_name, '/');
 398        if (dev_name_end) {
 399                if (strlen(dev_name_end) > 1) {
 400                        fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
 401                        if (!fsopt->server_path) {
 402                                err = -ENOMEM;
 403                                goto out;
 404                        }
 405                }
 406        } else {
 407                dev_name_end = dev_name + strlen(dev_name);
 408        }
 409        err = -EINVAL;
 410        dev_name_end--;         /* back up to ':' separator */
 411        if (dev_name_end < dev_name || *dev_name_end != ':') {
 412                pr_err("device name is missing path (no : separator in %s)\n",
 413                                dev_name);
 414                goto out;
 415        }
 416        dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 417        if (fsopt->server_path)
 418                dout("server path '%s'\n", fsopt->server_path);
 419
 420        *popt = ceph_parse_options(options, dev_name, dev_name_end,
 421                                 parse_fsopt_token, (void *)fsopt);
 422        if (IS_ERR(*popt)) {
 423                err = PTR_ERR(*popt);
 424                goto out;
 425        }
 426
 427        /* success */
 428        *pfsopt = fsopt;
 429        return 0;
 430
 431out:
 432        destroy_mount_options(fsopt);
 433        return err;
 434}
 435
 436/**
 437 * ceph_show_options - Show mount options in /proc/mounts
 438 * @m: seq_file to write to
 439 * @root: root of that (sub)tree
 440 */
 441static int ceph_show_options(struct seq_file *m, struct dentry *root)
 442{
 443        struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 444        struct ceph_mount_options *fsopt = fsc->mount_options;
 445        size_t pos;
 446        int ret;
 447
 448        /* a comma between MNT/MS and client options */
 449        seq_putc(m, ',');
 450        pos = m->count;
 451
 452        ret = ceph_print_client_options(m, fsc->client);
 453        if (ret)
 454                return ret;
 455
 456        /* retract our comma if no client options */
 457        if (m->count == pos)
 458                m->count--;
 459
 460        if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 461                seq_puts(m, ",dirstat");
 462        if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
 463                seq_puts(m, ",rbytes");
 464        if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 465                seq_puts(m, ",noasyncreaddir");
 466        if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
 467                seq_puts(m, ",nodcache");
 468        if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)
 469                seq_puts(m, ",fsc");
 470        if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
 471                seq_puts(m, ",nopoolperm");
 472
 473#ifdef CONFIG_CEPH_FS_POSIX_ACL
 474        if (fsopt->sb_flags & MS_POSIXACL)
 475                seq_puts(m, ",acl");
 476        else
 477                seq_puts(m, ",noacl");
 478#endif
 479
 480        if (fsopt->mds_namespace)
 481                seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace);
 482        if (fsopt->wsize)
 483                seq_printf(m, ",wsize=%d", fsopt->wsize);
 484        if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
 485                seq_printf(m, ",rsize=%d", fsopt->rsize);
 486        if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 487                seq_printf(m, ",rasize=%d", fsopt->rasize);
 488        if (fsopt->congestion_kb != default_congestion_kb())
 489                seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 490        if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 491                seq_printf(m, ",caps_wanted_delay_min=%d",
 492                         fsopt->caps_wanted_delay_min);
 493        if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 494                seq_printf(m, ",caps_wanted_delay_max=%d",
 495                           fsopt->caps_wanted_delay_max);
 496        if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 497                seq_printf(m, ",cap_release_safety=%d",
 498                           fsopt->cap_release_safety);
 499        if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 500                seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 501        if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 502                seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 503        if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 504                seq_show_option(m, "snapdirname", fsopt->snapdir_name);
 505
 506        return 0;
 507}
 508
 509/*
 510 * handle any mon messages the standard library doesn't understand.
 511 * return error if we don't either.
 512 */
 513static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 514{
 515        struct ceph_fs_client *fsc = client->private;
 516        int type = le16_to_cpu(msg->hdr.type);
 517
 518        switch (type) {
 519        case CEPH_MSG_MDS_MAP:
 520                ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
 521                return 0;
 522        case CEPH_MSG_FS_MAP_USER:
 523                ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
 524                return 0;
 525        default:
 526                return -1;
 527        }
 528}
 529
 530/*
 531 * create a new fs client
 532 */
 533static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 534                                        struct ceph_options *opt)
 535{
 536        struct ceph_fs_client *fsc;
 537        const u64 supported_features =
 538                CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH |
 539                CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA;
 540        const u64 required_features = 0;
 541        int page_count;
 542        size_t size;
 543        int err = -ENOMEM;
 544
 545        fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 546        if (!fsc)
 547                return ERR_PTR(-ENOMEM);
 548
 549        fsc->client = ceph_create_client(opt, fsc, supported_features,
 550                                         required_features);
 551        if (IS_ERR(fsc->client)) {
 552                err = PTR_ERR(fsc->client);
 553                goto fail;
 554        }
 555        fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 556
 557        if (fsopt->mds_namespace == NULL) {
 558                ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
 559                                   0, true);
 560        } else {
 561                ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
 562                                   0, false);
 563        }
 564
 565        fsc->mount_options = fsopt;
 566
 567        fsc->sb = NULL;
 568        fsc->mount_state = CEPH_MOUNT_MOUNTING;
 569
 570        atomic_long_set(&fsc->writeback_count, 0);
 571
 572        err = bdi_init(&fsc->backing_dev_info);
 573        if (err < 0)
 574                goto fail_client;
 575
 576        err = -ENOMEM;
 577        /*
 578         * The number of concurrent works can be high but they don't need
 579         * to be processed in parallel, limit concurrency.
 580         */
 581        fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 582        if (fsc->wb_wq == NULL)
 583                goto fail_bdi;
 584        fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 585        if (fsc->pg_inv_wq == NULL)
 586                goto fail_wb_wq;
 587        fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 588        if (fsc->trunc_wq == NULL)
 589                goto fail_pg_inv_wq;
 590
 591        /* set up mempools */
 592        err = -ENOMEM;
 593        page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
 594        size = sizeof (struct page *) * (page_count ? page_count : 1);
 595        fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
 596        if (!fsc->wb_pagevec_pool)
 597                goto fail_trunc_wq;
 598
 599        /* setup fscache */
 600        if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
 601            (ceph_fscache_register_fs(fsc) != 0))
 602                goto fail_fscache;
 603
 604        /* caps */
 605        fsc->min_caps = fsopt->max_readdir;
 606
 607        return fsc;
 608
 609fail_fscache:
 610        ceph_fscache_unregister_fs(fsc);
 611fail_trunc_wq:
 612        destroy_workqueue(fsc->trunc_wq);
 613fail_pg_inv_wq:
 614        destroy_workqueue(fsc->pg_inv_wq);
 615fail_wb_wq:
 616        destroy_workqueue(fsc->wb_wq);
 617fail_bdi:
 618        bdi_destroy(&fsc->backing_dev_info);
 619fail_client:
 620        ceph_destroy_client(fsc->client);
 621fail:
 622        kfree(fsc);
 623        return ERR_PTR(err);
 624}
 625
 626static void destroy_fs_client(struct ceph_fs_client *fsc)
 627{
 628        dout("destroy_fs_client %p\n", fsc);
 629
 630        ceph_fscache_unregister_fs(fsc);
 631
 632        destroy_workqueue(fsc->wb_wq);
 633        destroy_workqueue(fsc->pg_inv_wq);
 634        destroy_workqueue(fsc->trunc_wq);
 635
 636        bdi_destroy(&fsc->backing_dev_info);
 637
 638        mempool_destroy(fsc->wb_pagevec_pool);
 639
 640        destroy_mount_options(fsc->mount_options);
 641
 642        ceph_fs_debugfs_cleanup(fsc);
 643
 644        ceph_destroy_client(fsc->client);
 645
 646        kfree(fsc);
 647        dout("destroy_fs_client %p done\n", fsc);
 648}
 649
 650/*
 651 * caches
 652 */
 653struct kmem_cache *ceph_inode_cachep;
 654struct kmem_cache *ceph_cap_cachep;
 655struct kmem_cache *ceph_cap_flush_cachep;
 656struct kmem_cache *ceph_dentry_cachep;
 657struct kmem_cache *ceph_file_cachep;
 658
 659static void ceph_inode_init_once(void *foo)
 660{
 661        struct ceph_inode_info *ci = foo;
 662        inode_init_once(&ci->vfs_inode);
 663}
 664
 665static int __init init_caches(void)
 666{
 667        int error = -ENOMEM;
 668
 669        ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 670                                      sizeof(struct ceph_inode_info),
 671                                      __alignof__(struct ceph_inode_info),
 672                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
 673                                      SLAB_ACCOUNT, ceph_inode_init_once);
 674        if (ceph_inode_cachep == NULL)
 675                return -ENOMEM;
 676
 677        ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 678                                     SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 679        if (ceph_cap_cachep == NULL)
 680                goto bad_cap;
 681        ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
 682                                           SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 683        if (ceph_cap_flush_cachep == NULL)
 684                goto bad_cap_flush;
 685
 686        ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 687                                        SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 688        if (ceph_dentry_cachep == NULL)
 689                goto bad_dentry;
 690
 691        ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
 692
 693        if (ceph_file_cachep == NULL)
 694                goto bad_file;
 695
 696        if ((error = ceph_fscache_register()))
 697                goto bad_file;
 698
 699        return 0;
 700bad_file:
 701        kmem_cache_destroy(ceph_dentry_cachep);
 702bad_dentry:
 703        kmem_cache_destroy(ceph_cap_flush_cachep);
 704bad_cap_flush:
 705        kmem_cache_destroy(ceph_cap_cachep);
 706bad_cap:
 707        kmem_cache_destroy(ceph_inode_cachep);
 708        return error;
 709}
 710
 711static void destroy_caches(void)
 712{
 713        /*
 714         * Make sure all delayed rcu free inodes are flushed before we
 715         * destroy cache.
 716         */
 717        rcu_barrier();
 718
 719        kmem_cache_destroy(ceph_inode_cachep);
 720        kmem_cache_destroy(ceph_cap_cachep);
 721        kmem_cache_destroy(ceph_cap_flush_cachep);
 722        kmem_cache_destroy(ceph_dentry_cachep);
 723        kmem_cache_destroy(ceph_file_cachep);
 724
 725        ceph_fscache_unregister();
 726}
 727
 728
 729/*
 730 * ceph_umount_begin - initiate forced umount.  Tear down down the
 731 * mount, skipping steps that may hang while waiting for server(s).
 732 */
 733static void ceph_umount_begin(struct super_block *sb)
 734{
 735        struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 736
 737        dout("ceph_umount_begin - starting forced umount\n");
 738        if (!fsc)
 739                return;
 740        fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 741        ceph_mdsc_force_umount(fsc->mdsc);
 742        return;
 743}
 744
 745static const struct super_operations ceph_super_ops = {
 746        .alloc_inode    = ceph_alloc_inode,
 747        .destroy_inode  = ceph_destroy_inode,
 748        .write_inode    = ceph_write_inode,
 749        .drop_inode     = ceph_drop_inode,
 750        .evict_inode    = ceph_evict_inode,
 751        .sync_fs        = ceph_sync_fs,
 752        .put_super      = ceph_put_super,
 753        .show_options   = ceph_show_options,
 754        .statfs         = ceph_statfs,
 755        .umount_begin   = ceph_umount_begin,
 756};
 757
 758/*
 759 * Bootstrap mount by opening the root directory.  Note the mount
 760 * @started time from caller, and time out if this takes too long.
 761 */
 762static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 763                                       const char *path,
 764                                       unsigned long started)
 765{
 766        struct ceph_mds_client *mdsc = fsc->mdsc;
 767        struct ceph_mds_request *req = NULL;
 768        int err;
 769        struct dentry *root;
 770
 771        /* open dir */
 772        dout("open_root_inode opening '%s'\n", path);
 773        req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 774        if (IS_ERR(req))
 775                return ERR_CAST(req);
 776        req->r_path1 = kstrdup(path, GFP_NOFS);
 777        if (!req->r_path1) {
 778                root = ERR_PTR(-ENOMEM);
 779                goto out;
 780        }
 781
 782        req->r_ino1.ino = CEPH_INO_ROOT;
 783        req->r_ino1.snap = CEPH_NOSNAP;
 784        req->r_started = started;
 785        req->r_timeout = fsc->client->options->mount_timeout;
 786        req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 787        req->r_num_caps = 2;
 788        err = ceph_mdsc_do_request(mdsc, NULL, req);
 789        if (err == 0) {
 790                struct inode *inode = req->r_target_inode;
 791                req->r_target_inode = NULL;
 792                dout("open_root_inode success\n");
 793                root = d_make_root(inode);
 794                if (!root) {
 795                        root = ERR_PTR(-ENOMEM);
 796                        goto out;
 797                }
 798                ceph_init_dentry(root);
 799                dout("open_root_inode success, root dentry is %p\n", root);
 800        } else {
 801                root = ERR_PTR(err);
 802        }
 803out:
 804        ceph_mdsc_put_request(req);
 805        return root;
 806}
 807
 808
 809
 810
 811/*
 812 * mount: join the ceph cluster, and open root directory.
 813 */
 814static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc)
 815{
 816        int err;
 817        unsigned long started = jiffies;  /* note the start time */
 818        struct dentry *root;
 819        int first = 0;   /* first vfsmount for this super_block */
 820
 821        dout("mount start %p\n", fsc);
 822        mutex_lock(&fsc->client->mount_mutex);
 823
 824        if (!fsc->sb->s_root) {
 825                const char *path;
 826                err = __ceph_open_session(fsc->client, started);
 827                if (err < 0)
 828                        goto out;
 829
 830                if (!fsc->mount_options->server_path) {
 831                        path = "";
 832                        dout("mount opening path \\t\n");
 833                } else {
 834                        path = fsc->mount_options->server_path + 1;
 835                        dout("mount opening path %s\n", path);
 836                }
 837                root = open_root_dentry(fsc, path, started);
 838                if (IS_ERR(root)) {
 839                        err = PTR_ERR(root);
 840                        goto out;
 841                }
 842                fsc->sb->s_root = dget(root);
 843                first = 1;
 844
 845                err = ceph_fs_debugfs_init(fsc);
 846                if (err < 0)
 847                        goto fail;
 848        } else {
 849                root = dget(fsc->sb->s_root);
 850        }
 851
 852        fsc->mount_state = CEPH_MOUNT_MOUNTED;
 853        dout("mount success\n");
 854        mutex_unlock(&fsc->client->mount_mutex);
 855        return root;
 856
 857fail:
 858        if (first) {
 859                dput(fsc->sb->s_root);
 860                fsc->sb->s_root = NULL;
 861        }
 862out:
 863        mutex_unlock(&fsc->client->mount_mutex);
 864        return ERR_PTR(err);
 865}
 866
 867static int ceph_set_super(struct super_block *s, void *data)
 868{
 869        struct ceph_fs_client *fsc = data;
 870        int ret;
 871
 872        dout("set_super %p data %p\n", s, data);
 873
 874        s->s_flags = fsc->mount_options->sb_flags;
 875        s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 876
 877        s->s_xattr = ceph_xattr_handlers;
 878        s->s_fs_info = fsc;
 879        fsc->sb = s;
 880
 881        s->s_op = &ceph_super_ops;
 882        s->s_export_op = &ceph_export_ops;
 883
 884        s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 885
 886        ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 887        if (ret != 0)
 888                goto fail;
 889
 890        return ret;
 891
 892fail:
 893        s->s_fs_info = NULL;
 894        fsc->sb = NULL;
 895        return ret;
 896}
 897
 898/*
 899 * share superblock if same fs AND options
 900 */
 901static int ceph_compare_super(struct super_block *sb, void *data)
 902{
 903        struct ceph_fs_client *new = data;
 904        struct ceph_mount_options *fsopt = new->mount_options;
 905        struct ceph_options *opt = new->client->options;
 906        struct ceph_fs_client *other = ceph_sb_to_client(sb);
 907
 908        dout("ceph_compare_super %p\n", sb);
 909
 910        if (compare_mount_options(fsopt, opt, other)) {
 911                dout("monitor(s)/mount options don't match\n");
 912                return 0;
 913        }
 914        if ((opt->flags & CEPH_OPT_FSID) &&
 915            ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 916                dout("fsid doesn't match\n");
 917                return 0;
 918        }
 919        if (fsopt->sb_flags != other->mount_options->sb_flags) {
 920                dout("flags differ\n");
 921                return 0;
 922        }
 923        return 1;
 924}
 925
 926/*
 927 * construct our own bdi so we can control readahead, etc.
 928 */
 929static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 930
 931static int ceph_register_bdi(struct super_block *sb,
 932                             struct ceph_fs_client *fsc)
 933{
 934        int err;
 935
 936        /* set ra_pages based on rasize mount option? */
 937        if (fsc->mount_options->rasize >= PAGE_SIZE)
 938                fsc->backing_dev_info.ra_pages =
 939                        (fsc->mount_options->rasize + PAGE_SIZE - 1)
 940                        >> PAGE_SHIFT;
 941        else
 942                fsc->backing_dev_info.ra_pages =
 943                        VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
 944
 945        err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
 946                           atomic_long_inc_return(&bdi_seq));
 947        if (!err)
 948                sb->s_bdi = &fsc->backing_dev_info;
 949        return err;
 950}
 951
 952static struct dentry *ceph_mount(struct file_system_type *fs_type,
 953                       int flags, const char *dev_name, void *data)
 954{
 955        struct super_block *sb;
 956        struct ceph_fs_client *fsc;
 957        struct dentry *res;
 958        int err;
 959        int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 960        struct ceph_mount_options *fsopt = NULL;
 961        struct ceph_options *opt = NULL;
 962
 963        dout("ceph_mount\n");
 964
 965#ifdef CONFIG_CEPH_FS_POSIX_ACL
 966        flags |= MS_POSIXACL;
 967#endif
 968        err = parse_mount_options(&fsopt, &opt, flags, data, dev_name);
 969        if (err < 0) {
 970                res = ERR_PTR(err);
 971                goto out_final;
 972        }
 973
 974        /* create client (which we may/may not use) */
 975        fsc = create_fs_client(fsopt, opt);
 976        if (IS_ERR(fsc)) {
 977                res = ERR_CAST(fsc);
 978                destroy_mount_options(fsopt);
 979                ceph_destroy_options(opt);
 980                goto out_final;
 981        }
 982
 983        err = ceph_mdsc_init(fsc);
 984        if (err < 0) {
 985                res = ERR_PTR(err);
 986                goto out;
 987        }
 988
 989        if (ceph_test_opt(fsc->client, NOSHARE))
 990                compare_super = NULL;
 991        sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc);
 992        if (IS_ERR(sb)) {
 993                res = ERR_CAST(sb);
 994                goto out;
 995        }
 996
 997        if (ceph_sb_to_client(sb) != fsc) {
 998                ceph_mdsc_destroy(fsc);
 999                destroy_fs_client(fsc);
1000                fsc = ceph_sb_to_client(sb);
1001                dout("get_sb got existing client %p\n", fsc);
1002        } else {
1003                dout("get_sb using new client %p\n", fsc);
1004                err = ceph_register_bdi(sb, fsc);
1005                if (err < 0) {
1006                        res = ERR_PTR(err);
1007                        goto out_splat;
1008                }
1009        }
1010
1011        res = ceph_real_mount(fsc);
1012        if (IS_ERR(res))
1013                goto out_splat;
1014        dout("root %p inode %p ino %llx.%llx\n", res,
1015             d_inode(res), ceph_vinop(d_inode(res)));
1016        return res;
1017
1018out_splat:
1019        ceph_mdsc_close_sessions(fsc->mdsc);
1020        deactivate_locked_super(sb);
1021        goto out_final;
1022
1023out:
1024        ceph_mdsc_destroy(fsc);
1025        destroy_fs_client(fsc);
1026out_final:
1027        dout("ceph_mount fail %ld\n", PTR_ERR(res));
1028        return res;
1029}
1030
1031static void ceph_kill_sb(struct super_block *s)
1032{
1033        struct ceph_fs_client *fsc = ceph_sb_to_client(s);
1034        dev_t dev = s->s_dev;
1035
1036        dout("kill_sb %p\n", s);
1037
1038        ceph_mdsc_pre_umount(fsc->mdsc);
1039        generic_shutdown_super(s);
1040        ceph_mdsc_destroy(fsc);
1041
1042        destroy_fs_client(fsc);
1043        free_anon_bdev(dev);
1044}
1045
1046static struct file_system_type ceph_fs_type = {
1047        .owner          = THIS_MODULE,
1048        .name           = "ceph",
1049        .mount          = ceph_mount,
1050        .kill_sb        = ceph_kill_sb,
1051        .fs_flags       = FS_RENAME_DOES_D_MOVE,
1052};
1053MODULE_ALIAS_FS("ceph");
1054
1055static int __init init_ceph(void)
1056{
1057        int ret = init_caches();
1058        if (ret)
1059                goto out;
1060
1061        ceph_flock_init();
1062        ceph_xattr_init();
1063        ret = register_filesystem(&ceph_fs_type);
1064        if (ret)
1065                goto out_xattr;
1066
1067        pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
1068
1069        return 0;
1070
1071out_xattr:
1072        ceph_xattr_exit();
1073        destroy_caches();
1074out:
1075        return ret;
1076}
1077
1078static void __exit exit_ceph(void)
1079{
1080        dout("exit_ceph\n");
1081        unregister_filesystem(&ceph_fs_type);
1082        ceph_xattr_exit();
1083        destroy_caches();
1084}
1085
1086module_init(init_ceph);
1087module_exit(exit_ceph);
1088
1089MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1090MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1091MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1092MODULE_DESCRIPTION("Ceph filesystem for Linux");
1093MODULE_LICENSE("GPL");
1094
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.