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