fs/ceph/super.c

   1
   2 #include "ceph_debug.h"
   3
   4 #include <linux/backing-dev.h>
   5 #include <linux/fs.h>
   6 #include <linux/inet.h>
   7 #include <linux/in6.h>
   8 #include <linux/module.h>
   9 #include <linux/mount.h>
  10 #include <linux/parser.h>
  11 #include <linux/sched.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/slab.h>
  14 #include <linux/statfs.h>
  15 #include <linux/string.h>
  16
  17 #include "decode.h"
  18 #include "super.h"
  19 #include "mon_client.h"
  20 #include "auth.h"
  21
  22 /*
  23  * Ceph superblock operations
  24  *
  25  * Handle the basics of mounting, unmounting.
  26  */
  27
  28
  29 /*
  30  * find filename portion of a path (/foo/bar/baz -> baz)
  31  */
  32 const char *ceph_file_part(const char *s, int len)
  33 {
  34         const char *e = s + len;
  35
  36         while (e != s && *(e-1) != '/')
  37                 e--;
  38         return e;
  39 }
  40
  41
  42 /*
  43  * super ops
  44  */
  45 static void ceph_put_super(struct super_block *s)
  46 {
  47         struct ceph_client *client = ceph_sb_to_client(s);
  48
  49         dout("put_super\n");
  50         ceph_mdsc_close_sessions(&client->mdsc);
  51
  52         /*
  53          * ensure we release the bdi before put_anon_super releases
  54          * the device name.
  55          */
  56         if (s->s_bdi == &client->backing_dev_info) {
  57                 bdi_unregister(&client->backing_dev_info);
  58                 s->s_bdi = NULL;
  59         }
  60
  61         return;
  62 }
  63
  64 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
  65 {
  66         struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
  67         struct ceph_monmap *monmap = client->monc.monmap;
  68         struct ceph_statfs st;
  69         u64 fsid;
  70         int err;
  71
  72         dout("statfs\n");
  73         err = ceph_monc_do_statfs(&client->monc, &st);
  74         if (err < 0)
  75                 return err;
  76
  77         /* fill in kstatfs */
  78         buf->f_type = CEPH_SUPER_MAGIC;  /* ?? */
  79
  80         /*
  81          * express utilization in terms of large blocks to avoid
  82          * overflow on 32-bit machines.
  83          */
  84         buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
  85         buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
  86         buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
  87                 (CEPH_BLOCK_SHIFT-10);
  88         buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
  89
  90         buf->f_files = le64_to_cpu(st.num_objects);
  91         buf->f_ffree = -1;
  92         buf->f_namelen = NAME_MAX;
  93         buf->f_frsize = PAGE_CACHE_SIZE;
  94
  95         /* leave fsid little-endian, regardless of host endianness */
  96         fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
  97         buf->f_fsid.val[0] = fsid & 0xffffffff;
  98         buf->f_fsid.val[1] = fsid >> 32;
  99
 100         return 0;
 101 }
 102
 103
 104 static int ceph_syncfs(struct super_block *sb, int wait)
 105 {
 106         dout("sync_fs %d\n", wait);
 107         ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
 108         ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
 109         dout("sync_fs %d done\n", wait);
 110         return 0;
 111 }
 112
 113 static int default_congestion_kb(void)
 114 {
 115         int congestion_kb;
 116
 117         /*
 118          * Copied from NFS
 119          *
 120          * congestion size, scale with available memory.
 121          *
 122          *  64MB:    8192k
 123          * 128MB:   11585k
 124          * 256MB:   16384k
 125          * 512MB:   23170k
 126          *   1GB:   32768k
 127          *   2GB:   46340k
 128          *   4GB:   65536k
 129          *   8GB:   92681k
 130          *  16GB:  131072k
 131          *
 132          * This allows larger machines to have larger/more transfers.
 133          * Limit the default to 256M
 134          */
 135         congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
 136         if (congestion_kb > 256*1024)
 137                 congestion_kb = 256*1024;
 138
 139         return congestion_kb;
 140 }
 141
 142 /**
 143  * ceph_show_options - Show mount options in /proc/mounts
 144  * @m: seq_file to write to
 145  * @mnt: mount descriptor
 146  */
 147 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
 148 {
 149         struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
 150         struct ceph_mount_args *args = client->mount_args;
 151
 152         if (args->flags & CEPH_OPT_FSID)
 153                 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu",
 154                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
 155                            le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
 156         if (args->flags & CEPH_OPT_NOSHARE)
 157                 seq_puts(m, ",noshare");
 158         if (args->flags & CEPH_OPT_DIRSTAT)
 159                 seq_puts(m, ",dirstat");
 160         if ((args->flags & CEPH_OPT_RBYTES) == 0)
 161                 seq_puts(m, ",norbytes");
 162         if (args->flags & CEPH_OPT_NOCRC)
 163                 seq_puts(m, ",nocrc");
 164         if (args->flags & CEPH_OPT_NOASYNCREADDIR)
 165                 seq_puts(m, ",noasyncreaddir");
 166
 167         if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
 168                 seq_printf(m, ",mount_timeout=%d", args->mount_timeout);
 169         if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
 170                 seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl);
 171         if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
 172                 seq_printf(m, ",osdtimeout=%d", args->osd_timeout);
 173         if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
 174                 seq_printf(m, ",osdkeepalivetimeout=%d",
 175                          args->osd_keepalive_timeout);
 176         if (args->wsize)
 177                 seq_printf(m, ",wsize=%d", args->wsize);
 178         if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT)
 179                 seq_printf(m, ",rsize=%d", args->rsize);
 180         if (args->congestion_kb != default_congestion_kb())
 181                 seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb);
 182         if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
 183                 seq_printf(m, ",caps_wanted_delay_min=%d",
 184                          args->caps_wanted_delay_min);
 185         if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
 186                 seq_printf(m, ",caps_wanted_delay_max=%d",
 187                            args->caps_wanted_delay_max);
 188         if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
 189                 seq_printf(m, ",cap_release_safety=%d",
 190                            args->cap_release_safety);
 191         if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT)
 192                 seq_printf(m, ",readdir_max_entries=%d", args->max_readdir);
 193         if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
 194                 seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes);
 195         if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
 196                 seq_printf(m, ",snapdirname=%s", args->snapdir_name);
 197         if (args->name)
 198                 seq_printf(m, ",name=%s", args->name);
 199         if (args->secret)
 200                 seq_puts(m, ",secret=<hidden>");
 201         return 0;
 202 }
 203
 204 /*
 205  * caches
 206  */
 207 struct kmem_cache *ceph_inode_cachep;
 208 struct kmem_cache *ceph_cap_cachep;
 209 struct kmem_cache *ceph_dentry_cachep;
 210 struct kmem_cache *ceph_file_cachep;
 211
 212 static void ceph_inode_init_once(void *foo)
 213 {
 214         struct ceph_inode_info *ci = foo;
 215         inode_init_once(&ci->vfs_inode);
 216 }
 217
 218 static int __init init_caches(void)
 219 {
 220         ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
 221                                       sizeof(struct ceph_inode_info),
 222                                       __alignof__(struct ceph_inode_info),
 223                                       (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
 224                                       ceph_inode_init_once);
 225         if (ceph_inode_cachep == NULL)
 226                 return -ENOMEM;
 227
 228         ceph_cap_cachep = KMEM_CACHE(ceph_cap,
 229                                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 230         if (ceph_cap_cachep == NULL)
 231                 goto bad_cap;
 232
 233         ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
 234                                         SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 235         if (ceph_dentry_cachep == NULL)
 236                 goto bad_dentry;
 237
 238         ceph_file_cachep = KMEM_CACHE(ceph_file_info,
 239                                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
 240         if (ceph_file_cachep == NULL)
 241                 goto bad_file;
 242
 243         return 0;
 244
 245 bad_file:
 246         kmem_cache_destroy(ceph_dentry_cachep);
 247 bad_dentry:
 248         kmem_cache_destroy(ceph_cap_cachep);
 249 bad_cap:
 250         kmem_cache_destroy(ceph_inode_cachep);
 251         return -ENOMEM;
 252 }
 253
 254 static void destroy_caches(void)
 255 {
 256         kmem_cache_destroy(ceph_inode_cachep);
 257         kmem_cache_destroy(ceph_cap_cachep);
 258         kmem_cache_destroy(ceph_dentry_cachep);
 259         kmem_cache_destroy(ceph_file_cachep);
 260 }
 261
 262
 263 /*
 264  * ceph_umount_begin - initiate forced umount.  Tear down down the
 265  * mount, skipping steps that may hang while waiting for server(s).
 266  */
 267 static void ceph_umount_begin(struct super_block *sb)
 268 {
 269         struct ceph_client *client = ceph_sb_to_client(sb);
 270
 271         dout("ceph_umount_begin - starting forced umount\n");
 272         if (!client)
 273                 return;
 274         client->mount_state = CEPH_MOUNT_SHUTDOWN;
 275         return;
 276 }
 277
 278 static const struct super_operations ceph_super_ops = {
 279         .alloc_inode    = ceph_alloc_inode,
 280         .destroy_inode  = ceph_destroy_inode,
 281         .write_inode    = ceph_write_inode,
 282         .sync_fs        = ceph_syncfs,
 283         .put_super      = ceph_put_super,
 284         .show_options   = ceph_show_options,
 285         .statfs         = ceph_statfs,
 286         .umount_begin   = ceph_umount_begin,
 287 };
 288
 289
 290 const char *ceph_msg_type_name(int type)
 291 {
 292         switch (type) {
 293         case CEPH_MSG_SHUTDOWN: return "shutdown";
 294         case CEPH_MSG_PING: return "ping";
 295         case CEPH_MSG_AUTH: return "auth";
 296         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
 297         case CEPH_MSG_MON_MAP: return "mon_map";
 298         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
 299         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
 300         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
 301         case CEPH_MSG_STATFS: return "statfs";
 302         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
 303         case CEPH_MSG_MDS_MAP: return "mds_map";
 304         case CEPH_MSG_CLIENT_SESSION: return "client_session";
 305         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
 306         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
 307         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
 308         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
 309         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
 310         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
 311         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
 312         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
 313         case CEPH_MSG_OSD_MAP: return "osd_map";
 314         case CEPH_MSG_OSD_OP: return "osd_op";
 315         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
 316         default: return "unknown";
 317         }
 318 }
 319
 320
 321 /*
 322  * mount options
 323  */
 324 enum {
 325         Opt_fsidmajor,
 326         Opt_fsidminor,
 327         Opt_monport,
 328         Opt_wsize,
 329         Opt_rsize,
 330         Opt_osdtimeout,
 331         Opt_osdkeepalivetimeout,
 332         Opt_mount_timeout,
 333         Opt_osd_idle_ttl,
 334         Opt_caps_wanted_delay_min,
 335         Opt_caps_wanted_delay_max,
 336         Opt_cap_release_safety,
 337         Opt_readdir_max_entries,
 338         Opt_readdir_max_bytes,
 339         Opt_congestion_kb,
 340         Opt_last_int,
 341         /* int args above */
 342         Opt_snapdirname,
 343         Opt_name,
 344         Opt_secret,
 345         Opt_last_string,
 346         /* string args above */
 347         Opt_ip,
 348         Opt_noshare,
 349         Opt_dirstat,
 350         Opt_nodirstat,
 351         Opt_rbytes,
 352         Opt_norbytes,
 353         Opt_nocrc,
 354         Opt_noasyncreaddir,
 355 };
 356
 357 static match_table_t arg_tokens = {
 358         {Opt_fsidmajor, "fsidmajor=%ld"},
 359         {Opt_fsidminor, "fsidminor=%ld"},
 360         {Opt_monport, "monport=%d"},
 361         {Opt_wsize, "wsize=%d"},
 362         {Opt_rsize, "rsize=%d"},
 363         {Opt_osdtimeout, "osdtimeout=%d"},
 364         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
 365         {Opt_mount_timeout, "mount_timeout=%d"},
 366         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
 367         {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
 368         {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
 369         {Opt_cap_release_safety, "cap_release_safety=%d"},
 370         {Opt_readdir_max_entries, "readdir_max_entries=%d"},
 371         {Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
 372         {Opt_congestion_kb, "write_congestion_kb=%d"},
 373         /* int args above */
 374         {Opt_snapdirname, "snapdirname=%s"},
 375         {Opt_name, "name=%s"},
 376         {Opt_secret, "secret=%s"},
 377         /* string args above */
 378         {Opt_ip, "ip=%s"},
 379         {Opt_noshare, "noshare"},
 380         {Opt_dirstat, "dirstat"},
 381         {Opt_nodirstat, "nodirstat"},
 382         {Opt_rbytes, "rbytes"},
 383         {Opt_norbytes, "norbytes"},
 384         {Opt_nocrc, "nocrc"},
 385         {Opt_noasyncreaddir, "noasyncreaddir"},
 386         {-1, NULL}
 387 };
 388
 389
 390 static struct ceph_mount_args *parse_mount_args(int flags, char *options,
 391                                                 const char *dev_name,
 392                                                 const char **path)
 393 {
 394         struct ceph_mount_args *args;
 395         const char *c;
 396         int err = -ENOMEM;
 397         substring_t argstr[MAX_OPT_ARGS];
 398
 399         args = kzalloc(sizeof(*args), GFP_KERNEL);
 400         if (!args)
 401                 return ERR_PTR(-ENOMEM);
 402         args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
 403                                  GFP_KERNEL);
 404         if (!args->mon_addr)
 405                 goto out;
 406
 407         dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
 408
 409         /* start with defaults */
 410         args->sb_flags = flags;
 411         args->flags = CEPH_OPT_DEFAULT;
 412         args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
 413         args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
 414         args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
 415         args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */
 416         args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
 417         args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
 418         args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
 419         args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
 420         args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
 421         args->max_readdir = CEPH_MAX_READDIR_DEFAULT;
 422         args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
 423         args->congestion_kb = default_congestion_kb();
 424
 425         /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
 426         err = -EINVAL;
 427         if (!dev_name)
 428                 goto out;
 429         *path = strstr(dev_name, ":/");
 430         if (*path == NULL) {
 431                 pr_err("device name is missing path (no :/ in %s)\n",
 432                        dev_name);
 433                 goto out;
 434         }
 435
 436         /* get mon ip(s) */
 437         err = ceph_parse_ips(dev_name, *path, args->mon_addr,
 438                              CEPH_MAX_MON, &args->num_mon);
 439         if (err < 0)
 440                 goto out;
 441
 442         /* path on server */
 443         *path += 2;
 444         dout("server path '%s'\n", *path);
 445
 446         /* parse mount options */
 447         while ((c = strsep(&options, ",")) != NULL) {
 448                 int token, intval, ret;
 449                 if (!*c)
 450                         continue;
 451                 err = -EINVAL;
 452                 token = match_token((char *)c, arg_tokens, argstr);
 453                 if (token < 0) {
 454                         pr_err("bad mount option at '%s'\n", c);
 455                         goto out;
 456                 }
 457                 if (token < Opt_last_int) {
 458                         ret = match_int(&argstr[0], &intval);
 459                         if (ret < 0) {
 460                                 pr_err("bad mount option arg (not int) "
 461                                        "at '%s'\n", c);
 462                                 continue;
 463                         }
 464                         dout("got int token %d val %d\n", token, intval);
 465                 } else if (token > Opt_last_int && token < Opt_last_string) {
 466                         dout("got string token %d val %s\n", token,
 467                              argstr[0].from);
 468                 } else {
 469                         dout("got token %d\n", token);
 470                 }
 471                 switch (token) {
 472                 case Opt_fsidmajor:
 473                         *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
 474                         break;
 475                 case Opt_fsidminor:
 476                         *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
 477                         break;
 478                 case Opt_ip:
 479                         err = ceph_parse_ips(argstr[0].from,
 480                                              argstr[0].to,
 481                                              &args->my_addr,
 482                                              1, NULL);
 483                         if (err < 0)
 484                                 goto out;
 485                         args->flags |= CEPH_OPT_MYIP;
 486                         break;
 487
 488                 case Opt_snapdirname:
 489                         kfree(args->snapdir_name);
 490                         args->snapdir_name = kstrndup(argstr[0].from,
 491                                               argstr[0].to-argstr[0].from,
 492                                               GFP_KERNEL);
 493                         break;
 494                 case Opt_name:
 495                         args->name = kstrndup(argstr[0].from,
 496                                               argstr[0].to-argstr[0].from,
 497                                               GFP_KERNEL);
 498                         break;
 499                 case Opt_secret:
 500                         args->secret = kstrndup(argstr[0].from,
 501                                                 argstr[0].to-argstr[0].from,
 502                                                 GFP_KERNEL);
 503                         break;
 504
 505                         /* misc */
 506                 case Opt_wsize:
 507                         args->wsize = intval;
 508                         break;
 509                 case Opt_rsize:
 510                         args->rsize = intval;
 511                         break;
 512                 case Opt_osdtimeout:
 513                         args->osd_timeout = intval;
 514                         break;
 515                 case Opt_osdkeepalivetimeout:
 516                         args->osd_keepalive_timeout = intval;
 517                         break;
 518                 case Opt_mount_timeout:
 519                         args->mount_timeout = intval;
 520                         break;
 521                 case Opt_caps_wanted_delay_min:
 522                         args->caps_wanted_delay_min = intval;
 523                         break;
 524                 case Opt_caps_wanted_delay_max:
 525                         args->caps_wanted_delay_max = intval;
 526                         break;
 527                 case Opt_readdir_max_entries:
 528                         args->max_readdir = intval;
 529                         break;
 530                 case Opt_readdir_max_bytes:
 531                         args->max_readdir_bytes = intval;
 532                         break;
 533                 case Opt_congestion_kb:
 534                         args->congestion_kb = intval;
 535                         break;
 536
 537                 case Opt_noshare:
 538                         args->flags |= CEPH_OPT_NOSHARE;
 539                         break;
 540
 541                 case Opt_dirstat:
 542                         args->flags |= CEPH_OPT_DIRSTAT;
 543                         break;
 544                 case Opt_nodirstat:
 545                         args->flags &= ~CEPH_OPT_DIRSTAT;
 546                         break;
 547                 case Opt_rbytes:
 548                         args->flags |= CEPH_OPT_RBYTES;
 549                         break;
 550                 case Opt_norbytes:
 551                         args->flags &= ~CEPH_OPT_RBYTES;
 552                         break;
 553                 case Opt_nocrc:
 554                         args->flags |= CEPH_OPT_NOCRC;
 555                         break;
 556                 case Opt_noasyncreaddir:
 557                         args->flags |= CEPH_OPT_NOASYNCREADDIR;
 558                         break;
 559
 560                 default:
 561                         BUG_ON(token);
 562                 }
 563         }
 564         return args;
 565
 566 out:
 567         kfree(args->mon_addr);
 568         kfree(args);
 569         return ERR_PTR(err);
 570 }
 571
 572 static void destroy_mount_args(struct ceph_mount_args *args)
 573 {
 574         dout("destroy_mount_args %p\n", args);
 575         kfree(args->snapdir_name);
 576         args->snapdir_name = NULL;
 577         kfree(args->name);
 578         args->name = NULL;
 579         kfree(args->secret);
 580         args->secret = NULL;
 581         kfree(args);
 582 }
 583
 584 /*
 585  * create a fresh client instance
 586  */
 587 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
 588 {
 589         struct ceph_client *client;
 590         int err = -ENOMEM;
 591
 592         client = kzalloc(sizeof(*client), GFP_KERNEL);
 593         if (client == NULL)
 594                 return ERR_PTR(-ENOMEM);
 595
 596         mutex_init(&client->mount_mutex);
 597
 598         init_waitqueue_head(&client->auth_wq);
 599
 600         client->sb = NULL;
 601         client->mount_state = CEPH_MOUNT_MOUNTING;
 602         client->mount_args = args;
 603
 604         client->msgr = NULL;
 605
 606         client->auth_err = 0;
 607         atomic_long_set(&client->writeback_count, 0);
 608
 609         err = bdi_init(&client->backing_dev_info);
 610         if (err < 0)
 611                 goto fail;
 612
 613         err = -ENOMEM;
 614         client->wb_wq = create_workqueue("ceph-writeback");
 615         if (client->wb_wq == NULL)
 616                 goto fail_bdi;
 617         client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
 618         if (client->pg_inv_wq == NULL)
 619                 goto fail_wb_wq;
 620         client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
 621         if (client->trunc_wq == NULL)
 622                 goto fail_pg_inv_wq;
 623
 624         /* set up mempools */
 625         err = -ENOMEM;
 626         client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
 627                               client->mount_args->wsize >> PAGE_CACHE_SHIFT);
 628         if (!client->wb_pagevec_pool)
 629                 goto fail_trunc_wq;
 630
 631         /* caps */
 632         client->min_caps = args->max_readdir;
 633         ceph_adjust_min_caps(client->min_caps);
 634
 635         /* subsystems */
 636         err = ceph_monc_init(&client->monc, client);
 637         if (err < 0)
 638                 goto fail_mempool;
 639         err = ceph_osdc_init(&client->osdc, client);
 640         if (err < 0)
 641                 goto fail_monc;
 642         err = ceph_mdsc_init(&client->mdsc, client);
 643         if (err < 0)
 644                 goto fail_osdc;
 645         return client;
 646
 647 fail_osdc:
 648         ceph_osdc_stop(&client->osdc);
 649 fail_monc:
 650         ceph_monc_stop(&client->monc);
 651 fail_mempool:
 652         mempool_destroy(client->wb_pagevec_pool);
 653 fail_trunc_wq:
 654         destroy_workqueue(client->trunc_wq);
 655 fail_pg_inv_wq:
 656         destroy_workqueue(client->pg_inv_wq);
 657 fail_wb_wq:
 658         destroy_workqueue(client->wb_wq);
 659 fail_bdi:
 660         bdi_destroy(&client->backing_dev_info);
 661 fail:
 662         kfree(client);
 663         return ERR_PTR(err);
 664 }
 665
 666 static void ceph_destroy_client(struct ceph_client *client)
 667 {
 668         dout("destroy_client %p\n", client);
 669
 670         /* unmount */
 671         ceph_mdsc_stop(&client->mdsc);
 672         ceph_osdc_stop(&client->osdc);
 673
 674         /*
 675          * make sure mds and osd connections close out before destroying
 676          * the auth module, which is needed to free those connections'
 677          * ceph_authorizers.
 678          */
 679         ceph_msgr_flush();
 680
 681         ceph_monc_stop(&client->monc);
 682
 683         ceph_adjust_min_caps(-client->min_caps);
 684
 685         ceph_debugfs_client_cleanup(client);
 686         destroy_workqueue(client->wb_wq);
 687         destroy_workqueue(client->pg_inv_wq);
 688         destroy_workqueue(client->trunc_wq);
 689
 690         bdi_destroy(&client->backing_dev_info);
 691
 692         if (client->msgr)
 693                 ceph_messenger_destroy(client->msgr);
 694         mempool_destroy(client->wb_pagevec_pool);
 695
 696         destroy_mount_args(client->mount_args);
 697
 698         kfree(client);
 699         dout("destroy_client %p done\n", client);
 700 }
 701
 702 /*
 703  * Initially learn our fsid, or verify an fsid matches.
 704  */
 705 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
 706 {
 707         if (client->have_fsid) {
 708                 if (ceph_fsid_compare(&client->fsid, fsid)) {
 709                         pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT,
 710                                PR_FSID(&client->fsid), PR_FSID(fsid));
 711                         return -1;
 712                 }
 713         } else {
 714                 pr_info("client%lld fsid " FSID_FORMAT "\n",
 715                         client->monc.auth->global_id, PR_FSID(fsid));
 716                 memcpy(&client->fsid, fsid, sizeof(*fsid));
 717                 ceph_debugfs_client_init(client);
 718                 client->have_fsid = true;
 719         }
 720         return 0;
 721 }
 722
 723 /*
 724  * true if we have the mon map (and have thus joined the cluster)
 725  */
 726 static int have_mon_and_osd_map(struct ceph_client *client)
 727 {
 728         return client->monc.monmap && client->monc.monmap->epoch &&
 729                client->osdc.osdmap && client->osdc.osdmap->epoch;
 730 }
 731
 732 /*
 733  * Bootstrap mount by opening the root directory.  Note the mount
 734  * @started time from caller, and time out if this takes too long.
 735  */
 736 static struct dentry *open_root_dentry(struct ceph_client *client,
 737                                        const char *path,
 738                                        unsigned long started)
 739 {
 740         struct ceph_mds_client *mdsc = &client->mdsc;
 741         struct ceph_mds_request *req = NULL;
 742         int err;
 743         struct dentry *root;
 744
 745         /* open dir */
 746         dout("open_root_inode opening '%s'\n", path);
 747         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
 748         if (IS_ERR(req))
 749                 return ERR_CAST(req);
 750         req->r_path1 = kstrdup(path, GFP_NOFS);
 751         req->r_ino1.ino = CEPH_INO_ROOT;
 752         req->r_ino1.snap = CEPH_NOSNAP;
 753         req->r_started = started;
 754         req->r_timeout = client->mount_args->mount_timeout * HZ;
 755         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
 756         req->r_num_caps = 2;
 757         err = ceph_mdsc_do_request(mdsc, NULL, req);
 758         if (err == 0) {
 759                 dout("open_root_inode success\n");
 760                 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
 761                     client->sb->s_root == NULL)
 762                         root = d_alloc_root(req->r_target_inode);
 763                 else
 764                         root = d_obtain_alias(req->r_target_inode);
 765                 req->r_target_inode = NULL;
 766                 dout("open_root_inode success, root dentry is %p\n", root);
 767         } else {
 768                 root = ERR_PTR(err);
 769         }
 770         ceph_mdsc_put_request(req);
 771         return root;
 772 }
 773
 774 /*
 775  * mount: join the ceph cluster, and open root directory.
 776  */
 777 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
 778                       const char *path)
 779 {
 780         struct ceph_entity_addr *myaddr = NULL;
 781         int err;
 782         unsigned long timeout = client->mount_args->mount_timeout * HZ;
 783         unsigned long started = jiffies;  /* note the start time */
 784         struct dentry *root;
 785
 786         dout("mount start\n");
 787         mutex_lock(&client->mount_mutex);
 788
 789         /* initialize the messenger */
 790         if (client->msgr == NULL) {
 791                 if (ceph_test_opt(client, MYIP))
 792                         myaddr = &client->mount_args->my_addr;
 793                 client->msgr = ceph_messenger_create(myaddr);
 794                 if (IS_ERR(client->msgr)) {
 795                         err = PTR_ERR(client->msgr);
 796                         client->msgr = NULL;
 797                         goto out;
 798                 }
 799                 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
 800         }
 801
 802         /* open session, and wait for mon, mds, and osd maps */
 803         err = ceph_monc_open_session(&client->monc);
 804         if (err < 0)
 805                 goto out;
 806
 807         while (!have_mon_and_osd_map(client)) {
 808                 err = -EIO;
 809                 if (timeout && time_after_eq(jiffies, started + timeout))
 810                         goto out;
 811
 812                 /* wait */
 813                 dout("mount waiting for mon_map\n");
 814                 err = wait_event_interruptible_timeout(client->auth_wq,
 815                        have_mon_and_osd_map(client) || (client->auth_err < 0),
 816                        timeout);
 817                 if (err == -EINTR || err == -ERESTARTSYS)
 818                         goto out;
 819                 if (client->auth_err < 0) {
 820                         err = client->auth_err;
 821                         goto out;
 822                 }
 823         }
 824
 825         dout("mount opening root\n");
 826         root = open_root_dentry(client, "", started);
 827         if (IS_ERR(root)) {
 828                 err = PTR_ERR(root);
 829                 goto out;
 830         }
 831         if (client->sb->s_root)
 832                 dput(root);
 833         else
 834                 client->sb->s_root = root;
 835
 836         if (path[0] == 0) {
 837                 dget(root);
 838         } else {
 839                 dout("mount opening base mountpoint\n");
 840                 root = open_root_dentry(client, path, started);
 841                 if (IS_ERR(root)) {
 842                         err = PTR_ERR(root);
 843                         dput(client->sb->s_root);
 844                         client->sb->s_root = NULL;
 845                         goto out;
 846                 }
 847         }
 848
 849         mnt->mnt_root = root;
 850         mnt->mnt_sb = client->sb;
 851
 852         client->mount_state = CEPH_MOUNT_MOUNTED;
 853         dout("mount success\n");
 854         err = 0;
 855
 856 out:
 857         mutex_unlock(&client->mount_mutex);
 858         return err;
 859 }
 860
 861 static int ceph_set_super(struct super_block *s, void *data)
 862 {
 863         struct ceph_client *client = data;
 864         int ret;
 865
 866         dout("set_super %p data %p\n", s, data);
 867
 868         s->s_flags = client->mount_args->sb_flags;
 869         s->s_maxbytes = 1ULL << 40;  /* temp value until we get mdsmap */
 870
 871         s->s_fs_info = client;
 872         client->sb = s;
 873
 874         s->s_op = &ceph_super_ops;
 875         s->s_export_op = &ceph_export_ops;
 876
 877         s->s_time_gran = 1000;  /* 1000 ns == 1 us */
 878
 879         ret = set_anon_super(s, NULL);  /* what is that second arg for? */
 880         if (ret != 0)
 881                 goto fail;
 882
 883         return ret;
 884
 885 fail:
 886         s->s_fs_info = NULL;
 887         client->sb = NULL;
 888         return ret;
 889 }
 890
 891 /*
 892  * share superblock if same fs AND options
 893  */
 894 static int ceph_compare_super(struct super_block *sb, void *data)
 895 {
 896         struct ceph_client *new = data;
 897         struct ceph_mount_args *args = new->mount_args;
 898         struct ceph_client *other = ceph_sb_to_client(sb);
 899         int i;
 900
 901         dout("ceph_compare_super %p\n", sb);
 902         if (args->flags & CEPH_OPT_FSID) {
 903                 if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
 904                         dout("fsid doesn't match\n");
 905                         return 0;
 906                 }
 907         } else {
 908                 /* do we share (a) monitor? */
 909                 for (i = 0; i < new->monc.monmap->num_mon; i++)
 910                         if (ceph_monmap_contains(other->monc.monmap,
 911                                          &new->monc.monmap->mon_inst[i].addr))
 912                                 break;
 913                 if (i == new->monc.monmap->num_mon) {
 914                         dout("mon ip not part of monmap\n");
 915                         return 0;
 916                 }
 917                 dout("mon ip matches existing sb %p\n", sb);
 918         }
 919         if (args->sb_flags != other->mount_args->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  */
 929 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
 930
 931 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
 932 {
 933         int err;
 934
 935         /* set ra_pages based on rsize mount option? */
 936         if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
 937                 client->backing_dev_info.ra_pages =
 938                         (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
 939                         >> PAGE_SHIFT;
 940         err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d",
 941                            atomic_long_inc_return(&bdi_seq));
 942         if (!err)
 943                 sb->s_bdi = &client->backing_dev_info;
 944         return err;
 945 }
 946
 947 static int ceph_get_sb(struct file_system_type *fs_type,
 948                        int flags, const char *dev_name, void *data,
 949                        struct vfsmount *mnt)
 950 {
 951         struct super_block *sb;
 952         struct ceph_client *client;
 953         int err;
 954         int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
 955         const char *path = NULL;
 956         struct ceph_mount_args *args;
 957
 958         dout("ceph_get_sb\n");
 959         args = parse_mount_args(flags, data, dev_name, &path);
 960         if (IS_ERR(args)) {
 961                 err = PTR_ERR(args);
 962                 goto out_final;
 963         }
 964
 965         /* create client (which we may/may not use) */
 966         client = ceph_create_client(args);
 967         if (IS_ERR(client)) {
 968                 err = PTR_ERR(client);
 969                 goto out_final;
 970         }
 971
 972         if (client->mount_args->flags & CEPH_OPT_NOSHARE)
 973                 compare_super = NULL;
 974         sb = sget(fs_type, compare_super, ceph_set_super, client);
 975         if (IS_ERR(sb)) {
 976                 err = PTR_ERR(sb);
 977                 goto out;
 978         }
 979
 980         if (ceph_sb_to_client(sb) != client) {
 981                 ceph_destroy_client(client);
 982                 client = ceph_sb_to_client(sb);
 983                 dout("get_sb got existing client %p\n", client);
 984         } else {
 985                 dout("get_sb using new client %p\n", client);
 986                 err = ceph_register_bdi(sb, client);
 987                 if (err < 0)
 988                         goto out_splat;
 989         }
 990
 991         err = ceph_mount(client, mnt, path);
 992         if (err < 0)
 993                 goto out_splat;
 994         dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
 995              mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
 996         return 0;
 997
 998 out_splat:
 999         ceph_mdsc_close_sessions(&client->mdsc);
1000         deactivate_locked_super(sb);
1001         goto out_final;
1002
1003 out:
1004         ceph_destroy_client(client);
1005 out_final:
1006         dout("ceph_get_sb fail %d\n", err);
1007         return err;
1008 }
1009
1010 static void ceph_kill_sb(struct super_block *s)
1011 {
1012         struct ceph_client *client = ceph_sb_to_client(s);
1013         dout("kill_sb %p\n", s);
1014         ceph_mdsc_pre_umount(&client->mdsc);
1015         kill_anon_super(s);    /* will call put_super after sb is r/o */
1016         ceph_destroy_client(client);
1017 }
1018
1019 static struct file_system_type ceph_fs_type = {
1020         .owner          = THIS_MODULE,
1021         .name           = "ceph",
1022         .get_sb         = ceph_get_sb,
1023         .kill_sb        = ceph_kill_sb,
1024         .fs_flags       = FS_RENAME_DOES_D_MOVE,
1025 };
1026
1027 #define _STRINGIFY(x) #x
1028 #define STRINGIFY(x) _STRINGIFY(x)
1029
1030 static int __init init_ceph(void)
1031 {
1032         int ret = 0;
1033
1034         ret = ceph_debugfs_init();
1035         if (ret < 0)
1036                 goto out;
1037
1038         ret = ceph_msgr_init();
1039         if (ret < 0)
1040                 goto out_debugfs;
1041
1042         ret = init_caches();
1043         if (ret)
1044                 goto out_msgr;
1045
1046         ceph_caps_init();
1047
1048         ret = register_filesystem(&ceph_fs_type);
1049         if (ret)
1050                 goto out_icache;
1051
1052         pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
1053                 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
1054                 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
1055                 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
1056         return 0;
1057
1058 out_icache:
1059         destroy_caches();
1060 out_msgr:
1061         ceph_msgr_exit();
1062 out_debugfs:
1063         ceph_debugfs_cleanup();
1064 out:
1065         return ret;
1066 }
1067
1068 static void __exit exit_ceph(void)
1069 {
1070         dout("exit_ceph\n");
1071         unregister_filesystem(&ceph_fs_type);
1072         ceph_caps_finalize();
1073         destroy_caches();
1074         ceph_msgr_exit();
1075         ceph_debugfs_cleanup();
1076 }
1077
1078 module_init(init_ceph);
1079 module_exit(exit_ceph);
1080
1081 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
1082 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
1083 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
1084 MODULE_DESCRIPTION("Ceph filesystem for Linux");
1085 MODULE_LICENSE("GPL");