fs/ceph/super.c

   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
  21 #include <linux/ceph/decode.h>
  22 #include <linux/ceph/mon_client.h>
  23 #include <linux/ceph/auth.h>
  24 #include <linux/ceph/debugfs.h>
  25
  26 /*
  27  * Ceph superblock operations
  28  *
  29  * Handle the basics of mounting, unmounting.
  30  */
  31
  32 /*
  33  * super ops
  34  */
  35 static void ceph_put_super(struct super_block *s)
  36 {
  37         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
  38
  39         dout("put_super\n");
  40         ceph_mdsc_close_sessions(fsc->mdsc);
  41
  42         /*
  43          * ensure we release the bdi before put_anon_super releases
  44          * the device name.
  45          */
  46         if (s->s_bdi == &fsc->backing_dev_info) {
  47                 bdi_unregister(&fsc->backing_dev_info);
  48                 s->s_bdi = NULL;
  49         }
  50
  51         return;
  52 }
  53
  54 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  55 {
  56         struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode);
  57         struct ceph_monmap *monmap = fsc->client->monc.monmap;
  58         struct ceph_statfs st;
  59         u64 fsid;
  60         int err;
  61
  62         dout("statfs\n");
  63         err = ceph_monc_do_statfs(&fsc->client->monc, &st);
  64         if (err < 0)
  65                 return err;
  66
  67         /* fill in kstatfs */
  68         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  69
  70         /*
  71          * express utilization in terms of large blocks to avoid
  72          * overflow on 32-bit machines.
  73          */
  74         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  75         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  76         buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  77         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  78
  79         buf->f_files = le64_to_cpu(st.num_objects);
  80         buf->f_ffree = -1;
  81         buf->f_namelen = NAME_MAX;
  82         buf->f_frsize = PAGE_CACHE_SIZE;
  83
  84         /* leave fsid little-endian, regardless of host endianness */
  85         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  86         buf->f_fsid.val[0] = fsid & 0xffffffff;
  87         buf->f_fsid.val[1] = fsid >> 32;
  88
  89         return 0;
  90 }
  91
  92
  93 static int ceph_sync_fs(struct super_block *sb, int wait)
  94 {
  95         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
  96
  97         if (!wait) {
  98                 dout("sync_fs (non-blocking)\n");
  99                 ceph_flush_dirty_caps(fsc->mdsc);
 100                 dout("sync_fs (non-blocking) done\n");
 101                 return 0;
 102         }
 103
 104         dout("sync_fs (blocking)\n");
 105         ceph_osdc_sync(&fsc->client->osdc);
 106         ceph_mdsc_sync(fsc->mdsc);
 107         dout("sync_fs (blocking) done\n");
 108         return 0;
 109 }
 110
 111 /*
 112  * mount options
 113  */
 114 enum {
 115         Opt_wsize,
 116         Opt_rsize,
 117         Opt_rasize,
 118         Opt_caps_wanted_delay_min,
 119         Opt_caps_wanted_delay_max,
 120         Opt_cap_release_safety,
 121         Opt_readdir_max_entries,
 122         Opt_readdir_max_bytes,
 123         Opt_congestion_kb,
 124         Opt_last_int,
 125         /* int args above */
 126         Opt_snapdirname,
 127         Opt_last_string,
 128         /* string args above */
 129         Opt_dirstat,
 130         Opt_nodirstat,
 131         Opt_rbytes,
 132         Opt_norbytes,
 133         Opt_asyncreaddir,
 134         Opt_noasyncreaddir,
 135         Opt_dcache,
 136         Opt_nodcache,
 137         Opt_ino32,
 138         Opt_noino32,
 139 };
 140
 141 static match_table_t fsopt_tokens = {
 142         {Opt_wsize, "wsize=%d"},
 143         {Opt_rsize, "rsize=%d"},
 144         {Opt_rasize, "rasize=%d"},
 145         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 146         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 147         {Opt_cap_release_safety, "cap_release_safety=%d"},
 148         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 149         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 150         {Opt_congestion_kb, "write_congestion_kb=%d"},
 151         /* int args above */
 152         {Opt_snapdirname, "snapdirname=%s"},
 153         /* string args above */
 154         {Opt_dirstat, "dirstat"},
 155         {Opt_nodirstat, "nodirstat"},
 156         {Opt_rbytes, "rbytes"},
 157         {Opt_norbytes, "norbytes"},
 158         {Opt_asyncreaddir, "asyncreaddir"},
 159         {Opt_noasyncreaddir, "noasyncreaddir"},
 160         {Opt_dcache, "dcache"},
 161         {Opt_nodcache, "nodcache"},
 162         {Opt_ino32, "ino32"},
 163         {Opt_noino32, "noino32"},
 164         {-1, NULL}
 165 };
 166
 167 static int parse_fsopt_token(char *c, void *private)
 168 {
 169         struct ceph_mount_options *fsopt = private;
 170         substring_t argstr[MAX_OPT_ARGS];
 171         int token, intval, ret;
 172
 173         token = match_token((char *)c, fsopt_tokens, argstr);
 174         if (token < 0)
 175                 return -EINVAL;
 176
 177         if (token < Opt_last_int) {
 178                 ret = match_int(&argstr[0], &intval);
 179                 if (ret < 0) {
 180                         pr_err("bad mount option arg (not int) "
 181                                "at '%s'\n", c);
 182                         return ret;
 183                 }
 184                 dout("got int token %d val %d\n", token, intval);
 185         } else if (token > Opt_last_int && token < Opt_last_string) {
 186                 dout("got string token %d val %s\n", token,
 187                      argstr[0].from);
 188         } else {
 189                 dout("got token %d\n", token);
 190         }
 191
 192         switch (token) {
 193         case Opt_snapdirname:
 194                 kfree(fsopt->snapdir_name);
 195                 fsopt->snapdir_name = kstrndup(argstr[0].from,
 196                                                argstr[0].to-argstr[0].from,
 197                                                GFP_KERNEL);
 198                 if (!fsopt->snapdir_name)
 199                         return -ENOMEM;
 200                 break;
 201
 202                 /* misc */
 203         case Opt_wsize:
 204                 fsopt->wsize = intval;
 205                 break;
 206         case Opt_rsize:
 207                 fsopt->rsize = intval;
 208                 break;
 209         case Opt_rasize:
 210                 fsopt->rasize = intval;
 211                 break;
 212         case Opt_caps_wanted_delay_min:
 213                 fsopt->caps_wanted_delay_min = intval;
 214                 break;
 215         case Opt_caps_wanted_delay_max:
 216                 fsopt->caps_wanted_delay_max = intval;
 217                 break;
 218         case Opt_readdir_max_entries:
 219                 fsopt->max_readdir = intval;
 220                 break;
 221         case Opt_readdir_max_bytes:
 222                 fsopt->max_readdir_bytes = intval;
 223                 break;
 224         case Opt_congestion_kb:
 225                 fsopt->congestion_kb = intval;
 226                 break;
 227         case Opt_dirstat:
 228                 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
 229                 break;
 230         case Opt_nodirstat:
 231                 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
 232                 break;
 233         case Opt_rbytes:
 234                 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
 235                 break;
 236         case Opt_norbytes:
 237                 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
 238                 break;
 239         case Opt_asyncreaddir:
 240                 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
 241                 break;
 242         case Opt_noasyncreaddir:
 243                 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
 244                 break;
 245         case Opt_dcache:
 246                 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
 247                 break;
 248         case Opt_nodcache:
 249                 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
 250                 break;
 251         case Opt_ino32:
 252                 fsopt->flags |= CEPH_MOUNT_OPT_INO32;
 253                 break;
 254         case Opt_noino32:
 255                 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
 256                 break;
 257         default:
 258                 BUG_ON(token);
 259         }
 260         return 0;
 261 }
 262
 263 static void destroy_mount_options(struct ceph_mount_options *args)
 264 {
 265         dout("destroy_mount_options %p\n", args);
 266         kfree(args->snapdir_name);
 267         kfree(args);
 268 }
 269
 270 static int strcmp_null(const char *s1, const char *s2)
 271 {
 272         if (!s1 && !s2)
 273                 return 0;
 274         if (s1 && !s2)
 275                 return -1;
 276         if (!s1 && s2)
 277                 return 1;
 278         return strcmp(s1, s2);
 279 }
 280
 281 static int compare_mount_options(struct ceph_mount_options *new_fsopt,
 282                                  struct ceph_options *new_opt,
 283                                  struct ceph_fs_client *fsc)
 284 {
 285         struct ceph_mount_options *fsopt1 = new_fsopt;
 286         struct ceph_mount_options *fsopt2 = fsc->mount_options;
 287         int ofs = offsetof(struct ceph_mount_options, snapdir_name);
 288         int ret;
 289
 290         ret = memcmp(fsopt1, fsopt2, ofs);
 291         if (ret)
 292                 return ret;
 293
 294         ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
 295         if (ret)
 296                 return ret;
 297
 298         return ceph_compare_options(new_opt, fsc->client);
 299 }
 300
 301 static int parse_mount_options(struct ceph_mount_options **pfsopt,
 302                                struct ceph_options **popt,
 303                                int flags, char *options,
 304                                const char *dev_name,
 305                                const char **path)
 306 {
 307         struct ceph_mount_options *fsopt;
 308         const char *dev_name_end;
 309         int err = -ENOMEM;
 310
 311         fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL);
 312         if (!fsopt)
 313                 return -ENOMEM;
 314
 315         dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name);
 316
 317         fsopt->sb_flags = flags;
 318         fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
 319
 320         fsopt->rsize = CEPH_RSIZE_DEFAULT;
 321         fsopt->rasize = CEPH_RASIZE_DEFAULT;
 322         fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 323         fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 324         fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 325         fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
 326         fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 327         fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 328         fsopt->congestion_kb = default_congestion_kb();
 329
 330         /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
 331         err = -EINVAL;
 332         if (!dev_name)
 333                 goto out;
 334         *path = strstr(dev_name, ":/");
 335         if (*path == NULL) {
 336                 pr_err("device name is missing path (no :/ in %s)\n",
 337                                 dev_name);
 338                 goto out;
 339         }
 340         dev_name_end = *path;
 341         dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
 342
 343         /* path on server */
 344         *path += 2;
 345         dout("server path '%s'\n", *path);
 346
 347         *popt = ceph_parse_options(options, dev_name, dev_name_end,
 348                                  parse_fsopt_token, (void *)fsopt);
 349         if (IS_ERR(*popt)) {
 350                 err = PTR_ERR(*popt);
 351                 goto out;
 352         }
 353
 354         /* success */
 355         *pfsopt = fsopt;
 356         return 0;
 357
 358 out:
 359         destroy_mount_options(fsopt);
 360         return err;
 361 }
 362
 363 /**
 364  * ceph_show_options - Show mount options in /proc/mounts
 365  * @m: seq_file to write to
 366  * @root: root of that (sub)tree
 367  */
 368 static int ceph_show_options(struct seq_file *m, struct dentry *root)
 369 {
 370         struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
 371         struct ceph_mount_options *fsopt = fsc->mount_options;
 372         struct ceph_options *opt = fsc->client->options;
 373
 374         if (opt->flags & CEPH_OPT_FSID)
 375                 seq_printf(m, ",fsid=%pU", &opt->fsid);
 376         if (opt->flags & CEPH_OPT_NOSHARE)
 377                 seq_puts(m, ",noshare");
 378         if (opt->flags & CEPH_OPT_NOCRC)
 379                 seq_puts(m, ",nocrc");
 380
 381         if (opt->name)
 382                 seq_printf(m, ",name=%s", opt->name);
 383         if (opt->key)
 384                 seq_puts(m, ",secret=<hidden>");
 385
 386         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
 387                 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout);
 388         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
 389                 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl);
 390         if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
 391                 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout);
 392         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
 393                 seq_printf(m, ",osdkeepalivetimeout=%d",
 394                            opt->osd_keepalive_timeout);
 395
 396         if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
 397                 seq_puts(m, ",dirstat");
 398         if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0)
 399                 seq_puts(m, ",norbytes");
 400         if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
 401                 seq_puts(m, ",noasyncreaddir");
 402         if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE)
 403                 seq_puts(m, ",dcache");
 404         else
 405                 seq_puts(m, ",nodcache");
 406
 407         if (fsopt->wsize)
 408                 seq_printf(m, ",wsize=%d", fsopt->wsize);
 409         if (fsopt->rsize != CEPH_RSIZE_DEFAULT)
 410                 seq_printf(m, ",rsize=%d", fsopt->rsize);
 411         if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
 412                 seq_printf(m, ",rasize=%d", fsopt->rasize);
 413         if (fsopt->congestion_kb != default_congestion_kb())
 414                 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
 415         if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 416                 seq_printf(m, ",caps_wanted_delay_min=%d",
 417                          fsopt->caps_wanted_delay_min);
 418         if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 419                 seq_printf(m, ",caps_wanted_delay_max=%d",
 420                            fsopt->caps_wanted_delay_max);
 421         if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 422                 seq_printf(m, ",cap_release_safety=%d",
 423                            fsopt->cap_release_safety);
 424         if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 425                 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir);
 426         if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 427                 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes);
 428         if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 429                 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name);
 430         return 0;
 431 }
 432
 433 /*
 434  * handle any mon messages the standard library doesn't understand.
 435  * return error if we don't either.
 436  */
 437 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
 438 {
 439         struct ceph_fs_client *fsc = client->private;
 440         int type = le16_to_cpu(msg->hdr.type);
 441
 442         switch (type) {
 443         case CEPH_MSG_MDS_MAP:
 444                 ceph_mdsc_handle_map(fsc->mdsc, msg);
 445                 return 0;
 446
 447         default:
 448                 return -1;
 449         }
 450 }
 451
 452 /*
 453  * create a new fs client
 454  */
 455 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 456                                         struct ceph_options *opt)
 457 {
 458         struct ceph_fs_client *fsc;
 459         const unsigned supported_features =
 460                 CEPH_FEATURE_FLOCK |
 461                 CEPH_FEATURE_DIRLAYOUTHASH;
 462         const unsigned required_features = 0;
 463         int err = -ENOMEM;
 464
 465         fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
 466         if (!fsc)
 467                 return ERR_PTR(-ENOMEM);
 468
 469         fsc->client = ceph_create_client(opt, fsc, supported_features,
 470                                          required_features);
 471         if (IS_ERR(fsc->client)) {
 472                 err = PTR_ERR(fsc->client);
 473                 goto fail;
 474         }
 475         fsc->client->extra_mon_dispatch = extra_mon_dispatch;
 476         fsc->client->monc.want_mdsmap = 1;
 477
 478         fsc->mount_options = fsopt;
 479
 480         fsc->sb = NULL;
 481         fsc->mount_state = CEPH_MOUNT_MOUNTING;
 482
 483         atomic_long_set(&fsc->writeback_count, 0);
 484
 485         err = bdi_init(&fsc->backing_dev_info);
 486         if (err < 0)
 487                 goto fail_client;
 488
 489         err = -ENOMEM;
 490         /*
 491          * The number of concurrent works can be high but they don't need
 492          * to be processed in parallel, limit concurrency.
 493          */
 494         fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
 495         if (fsc->wb_wq == NULL)
 496                 goto fail_bdi;
 497         fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
 498         if (fsc->pg_inv_wq == NULL)
 499                 goto fail_wb_wq;
 500         fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
 501         if (fsc->trunc_wq == NULL)
 502                 goto fail_pg_inv_wq;
 503
 504         /* set up mempools */
 505         err = -ENOMEM;
 506         fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
 507                               fsc->mount_options->wsize >> PAGE_CACHE_SHIFT);
 508         if (!fsc->wb_pagevec_pool)
 509                 goto fail_trunc_wq;
 510
 511         /* caps */
 512         fsc->min_caps = fsopt->max_readdir;
 513
 514         return fsc;
 515
 516 fail_trunc_wq:
 517         destroy_workqueue(fsc->trunc_wq);
 518 fail_pg_inv_wq:
 519         destroy_workqueue(fsc->pg_inv_wq);
 520 fail_wb_wq:
 521         destroy_workqueue(fsc->wb_wq);
 522 fail_bdi:
 523         bdi_destroy(&fsc->backing_dev_info);
 524 fail_client:
 525         ceph_destroy_client(fsc->client);
 526 fail:
 527         kfree(fsc);
 528         return ERR_PTR(err);
 529 }
 530
 531 static void destroy_fs_client(struct ceph_fs_client *fsc)
 532 {
 533         dout("destroy_fs_client %p\n", fsc);
 534
 535         destroy_workqueue(fsc->wb_wq);
 536         destroy_workqueue(fsc->pg_inv_wq);
 537         destroy_workqueue(fsc->trunc_wq);
 538
 539         bdi_destroy(&fsc->backing_dev_info);
 540
 541         mempool_destroy(fsc->wb_pagevec_pool);
 542
 543         destroy_mount_options(fsc->mount_options);
 544
 545         ceph_fs_debugfs_cleanup(fsc);
 546
 547         ceph_destroy_client(fsc->client);
 548
 549         kfree(fsc);
 550         dout("destroy_fs_client %p done\n", fsc);
 551 }
 552
 553 /*
 554  * caches
 555  */
 556 struct kmem_cache *ceph_inode_cachep;
 557 struct kmem_cache *ceph_cap_cachep;
 558 struct kmem_cache *ceph_dentry_cachep;
 559 struct kmem_cache *ceph_file_cachep;
 560
 561 static void ceph_inode_init_once(void *foo)
 562 {
 563         struct ceph_inode_info *ci = foo;
 564         inode_init_once(&ci->vfs_inode);
 565 }
 566
 567 static int __init init_caches(void)
 568 {
 569         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 570                                       sizeof(struct ceph_inode_info),
 571                                       __alignof__(struct ceph_inode_info),
 572                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 573                                       ceph_inode_init_once);
 574         if (ceph_inode_cachep == NULL)
 575                 return -ENOMEM;
 576
 577         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 578                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 579         if (ceph_cap_cachep == NULL)
 580                 goto bad_cap;
 581
 582         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 583                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 584         if (ceph_dentry_cachep == NULL)
 585                 goto bad_dentry;
 586
 587         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 588                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 589         if (ceph_file_cachep == NULL)
 590                 goto bad_file;
 591
 592         return 0;
 593
 594 bad_file:
 595         kmem_cache_destroy(ceph_dentry_cachep);
 596 bad_dentry:
 597         kmem_cache_destroy(ceph_cap_cachep);
 598 bad_cap:
 599         kmem_cache_destroy(ceph_inode_cachep);
 600         return -ENOMEM;
 601 }
 602
 603 static void destroy_caches(void)
 604 {
 605         kmem_cache_destroy(ceph_inode_cachep);
 606         kmem_cache_destroy(ceph_cap_cachep);
 607         kmem_cache_destroy(ceph_dentry_cachep);
 608         kmem_cache_destroy(ceph_file_cachep);
 609 }
 610
 611
 612 /*
 613  * ceph_umount_begin - initiate forced umount.  Tear down down the
 614  * mount, skipping steps that may hang while waiting for server(s).
 615  */
 616 static void ceph_umount_begin(struct super_block *sb)
 617 {
 618         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 619
 620         dout("ceph_umount_begin - starting forced umount\n");
 621         if (!fsc)
 622                 return;
 623         fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 624         return;
 625 }
 626
 627 static const struct super_operations ceph_super_ops = {
 628         .alloc_inode    = ceph_alloc_inode,
 629         .destroy_inode  = ceph_destroy_inode,
 630         .write_inode    = ceph_write_inode,
 631         .sync_fs        = ceph_sync_fs,
 632         .put_super      = ceph_put_super,
 633         .show_options   = ceph_show_options,
 634         .statfs         = ceph_statfs,
 635         .umount_begin   = ceph_umount_begin,
 636 };
 637
 638 /*
 639  * Bootstrap mount by opening the root directory.  Note the mount
 640  * @started time from caller, and time out if this takes too long.
 641  */
 642 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
 643                                        const char *path,
 644                                        unsigned long started)
 645 {
 646         struct ceph_mds_client *mdsc = fsc->mdsc;
 647         struct ceph_mds_request *req = NULL;
 648         int err;
 649         struct dentry *root;
 650
 651         /* open dir */
 652         dout("open_root_inode opening '%s'\n", path);
 653         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 654         if (IS_ERR(req))
 655                 return ERR_CAST(req);
 656         req->r_path1 = kstrdup(path, GFP_NOFS);
 657         req->r_ino1.ino = CEPH_INO_ROOT;
 658         req->r_ino1.snap = CEPH_NOSNAP;
 659         req->r_started = started;
 660         req->r_timeout = fsc->client->options->mount_timeout * HZ;
 661         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 662         req->r_num_caps = 2;
 663         err = ceph_mdsc_do_request(mdsc, NULL, req);
 664         if (err == 0) {
 665                 struct inode *inode = req->r_target_inode;
 666                 req->r_target_inode = NULL;
 667                 dout("open_root_inode success\n");
 668                 if (ceph_ino(inode) == CEPH_INO_ROOT &&
 669                     fsc->sb->s_root == NULL) {
 670                         root = d_make_root(inode);
 671                         if (!root) {
 672                                 root = ERR_PTR(-ENOMEM);
 673                                 goto out;
 674                         }
 675                 } else {
 676                         root = d_obtain_alias(inode);
 677                 }
 678                 ceph_init_dentry(root);
 679                 dout("open_root_inode success, root dentry is %p\n", root);
 680         } else {
 681                 root = ERR_PTR(err);
 682         }
 683 out:
 684         ceph_mdsc_put_request(req);
 685         return root;
 686 }
 687
 688
 689
 690
 691 /*
 692  * mount: join the ceph cluster, and open root directory.
 693  */
 694 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
 695                       const char *path)
 696 {
 697         int err;
 698         unsigned long started = jiffies;  /* note the start time */
 699         struct dentry *root;
 700         int first = 0;   /* first vfsmount for this super_block */
 701
 702         dout("mount start\n");
 703         mutex_lock(&fsc->client->mount_mutex);
 704
 705         err = __ceph_open_session(fsc->client, started);
 706         if (err < 0)
 707                 goto out;
 708
 709         dout("mount opening root\n");
 710         root = open_root_dentry(fsc, "", started);
 711         if (IS_ERR(root)) {
 712                 err = PTR_ERR(root);
 713                 goto out;
 714         }
 715         if (fsc->sb->s_root) {
 716                 dput(root);
 717         } else {
 718                 fsc->sb->s_root = root;
 719                 first = 1;
 720
 721                 err = ceph_fs_debugfs_init(fsc);
 722                 if (err < 0)
 723                         goto fail;
 724         }
 725
 726         if (path[0] == 0) {
 727                 dget(root);
 728         } else {
 729                 dout("mount opening base mountpoint\n");
 730                 root = open_root_dentry(fsc, path, started);
 731                 if (IS_ERR(root)) {
 732                         err = PTR_ERR(root);
 733                         goto fail;
 734                 }
 735         }
 736
 737         fsc->mount_state = CEPH_MOUNT_MOUNTED;
 738         dout("mount success\n");
 739         mutex_unlock(&fsc->client->mount_mutex);
 740         return root;
 741
 742 out:
 743         mutex_unlock(&fsc->client->mount_mutex);
 744         return ERR_PTR(err);
 745
 746 fail:
 747         if (first) {
 748                 dput(fsc->sb->s_root);
 749                 fsc->sb->s_root = NULL;
 750         }
 751         goto out;
 752 }
 753
 754 static int ceph_set_super(struct super_block *s, void *data)
 755 {
 756         struct ceph_fs_client *fsc = data;
 757         int ret;
 758
 759         dout("set_super %p data %p\n", s, data);
 760
 761         s->s_flags = fsc->mount_options->sb_flags;
 762         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 763
 764         s->s_fs_info = fsc;
 765         fsc->sb = s;
 766
 767         s->s_op = &ceph_super_ops;
 768         s->s_export_op = &ceph_export_ops;
 769
 770         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 771
 772         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 773         if (ret != 0)
 774                 goto fail;
 775
 776         return ret;
 777
 778 fail:
 779         s->s_fs_info = NULL;
 780         fsc->sb = NULL;
 781         return ret;
 782 }
 783
 784 /*
 785  * share superblock if same fs AND options
 786  */
 787 static int ceph_compare_super(struct super_block *sb, void *data)
 788 {
 789         struct ceph_fs_client *new = data;
 790         struct ceph_mount_options *fsopt = new->mount_options;
 791         struct ceph_options *opt = new->client->options;
 792         struct ceph_fs_client *other = ceph_sb_to_client(sb);
 793
 794         dout("ceph_compare_super %p\n", sb);
 795
 796         if (compare_mount_options(fsopt, opt, other)) {
 797                 dout("monitor(s)/mount options don't match\n");
 798                 return 0;
 799         }
 800         if ((opt->flags & CEPH_OPT_FSID) &&
 801             ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
 802                 dout("fsid doesn't match\n");
 803                 return 0;
 804         }
 805         if (fsopt->sb_flags != other->mount_options->sb_flags) {
 806                 dout("flags differ\n");
 807                 return 0;
 808         }
 809         return 1;
 810 }
 811
 812 /*
 813  * construct our own bdi so we can control readahead, etc.
 814  */
 815 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 816
 817 static int ceph_register_bdi(struct super_block *sb,
 818                              struct ceph_fs_client *fsc)
 819 {
 820         int err;
 821
 822         /* set ra_pages based on rasize mount option? */
 823         if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE)
 824                 fsc->backing_dev_info.ra_pages =
 825                         (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1)
 826                         >> PAGE_SHIFT;
 827         else
 828                 fsc->backing_dev_info.ra_pages =
 829                         default_backing_dev_info.ra_pages;
 830
 831         err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
 832                            atomic_long_inc_return(&bdi_seq));
 833         if (!err)
 834                 sb->s_bdi = &fsc->backing_dev_info;
 835         return err;
 836 }
 837
 838 static struct dentry *ceph_mount(struct file_system_type *fs_type,
 839                        int flags, const char *dev_name, void *data)
 840 {
 841         struct super_block *sb;
 842         struct ceph_fs_client *fsc;
 843         struct dentry *res;
 844         int err;
 845         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 846         const char *path = NULL;
 847         struct ceph_mount_options *fsopt = NULL;
 848         struct ceph_options *opt = NULL;
 849
 850         dout("ceph_mount\n");
 851         err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path);
 852         if (err < 0) {
 853                 res = ERR_PTR(err);
 854                 goto out_final;
 855         }
 856
 857         /* create client (which we may/may not use) */
 858         fsc = create_fs_client(fsopt, opt);
 859         if (IS_ERR(fsc)) {
 860                 res = ERR_CAST(fsc);
 861                 destroy_mount_options(fsopt);
 862                 ceph_destroy_options(opt);
 863                 goto out_final;
 864         }
 865
 866         err = ceph_mdsc_init(fsc);
 867         if (err < 0) {
 868                 res = ERR_PTR(err);
 869                 goto out;
 870         }
 871
 872         if (ceph_test_opt(fsc->client, NOSHARE))
 873                 compare_super = NULL;
 874         sb = sget(fs_type, compare_super, ceph_set_super, fsc);
 875         if (IS_ERR(sb)) {
 876                 res = ERR_CAST(sb);
 877                 goto out;
 878         }
 879
 880         if (ceph_sb_to_client(sb) != fsc) {
 881                 ceph_mdsc_destroy(fsc);
 882                 destroy_fs_client(fsc);
 883                 fsc = ceph_sb_to_client(sb);
 884                 dout("get_sb got existing client %p\n", fsc);
 885         } else {
 886                 dout("get_sb using new client %p\n", fsc);
 887                 err = ceph_register_bdi(sb, fsc);
 888                 if (err < 0) {
 889                         res = ERR_PTR(err);
 890                         goto out_splat;
 891                 }
 892         }
 893
 894         res = ceph_real_mount(fsc, path);
 895         if (IS_ERR(res))
 896                 goto out_splat;
 897         dout("root %p inode %p ino %llx.%llx\n", res,
 898              res->d_inode, ceph_vinop(res->d_inode));
 899         return res;
 900
 901 out_splat:
 902         ceph_mdsc_close_sessions(fsc->mdsc);
 903         deactivate_locked_super(sb);
 904         goto out_final;
 905
 906 out:
 907         ceph_mdsc_destroy(fsc);
 908         destroy_fs_client(fsc);
 909 out_final:
 910         dout("ceph_mount fail %ld\n", PTR_ERR(res));
 911         return res;
 912 }
 913
 914 static void ceph_kill_sb(struct super_block *s)
 915 {
 916         struct ceph_fs_client *fsc = ceph_sb_to_client(s);
 917         dout("kill_sb %p\n", s);
 918         ceph_mdsc_pre_umount(fsc->mdsc);
 919         kill_anon_super(s);    /* will call put_super after sb is r/o */
 920         ceph_mdsc_destroy(fsc);
 921         destroy_fs_client(fsc);
 922 }
 923
 924 static struct file_system_type ceph_fs_type = {
 925         .owner          = THIS_MODULE,
 926         .name           = "ceph",
 927         .mount          = ceph_mount,
 928         .kill_sb        = ceph_kill_sb,
 929         .fs_flags       = FS_RENAME_DOES_D_MOVE,
 930 };
 931
 932 #define _STRINGIFY(x) #x
 933 #define STRINGIFY(x) _STRINGIFY(x)
 934
 935 static int __init init_ceph(void)
 936 {
 937         int ret = init_caches();
 938         if (ret)
 939                 goto out;
 940
 941         ceph_xattr_init();
 942         ret = register_filesystem(&ceph_fs_type);
 943         if (ret)
 944                 goto out_icache;
 945
 946         pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
 947
 948         return 0;
 949
 950 out_icache:
 951         ceph_xattr_exit();
 952         destroy_caches();
 953 out:
 954         return ret;
 955 }
 956
 957 static void __exit exit_ceph(void)
 958 {
 959         dout("exit_ceph\n");
 960         unregister_filesystem(&ceph_fs_type);
 961         ceph_xattr_exit();
 962         destroy_caches();
 963 }
 964
 965 module_init(init_ceph);
 966 module_exit(exit_ceph);
 967
 968 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
 969 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
 970 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
 971 MODULE_DESCRIPTION("Ceph filesystem for Linux");
 972 MODULE_LICENSE("GPL");