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   1/*
   2 * Copyright (C) 2005, 2006
   3 * Avishay Traeger (avishay@gmail.com)
   4 * Copyright (C) 2008, 2009
   5 * Boaz Harrosh <bharrosh@panasas.com>
   6 *
   7 * Copyrights for code taken from ext2:
   8 *     Copyright (C) 1992, 1993, 1994, 1995
   9 *     Remy Card (card@masi.ibp.fr)
  10 *     Laboratoire MASI - Institut Blaise Pascal
  11 *     Universite Pierre et Marie Curie (Paris VI)
  12 *     from
  13 *     linux/fs/minix/inode.c
  14 *     Copyright (C) 1991, 1992  Linus Torvalds
  15 *
  16 * This file is part of exofs.
  17 *
  18 * exofs is free software; you can redistribute it and/or modify
  19 * it under the terms of the GNU General Public License as published by
  20 * the Free Software Foundation.  Since it is based on ext2, and the only
  21 * valid version of GPL for the Linux kernel is version 2, the only valid
  22 * version of GPL for exofs is version 2.
  23 *
  24 * exofs is distributed in the hope that it will be useful,
  25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 * GNU General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License
  30 * along with exofs; if not, write to the Free Software
  31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  32 */
  33
  34#include <linux/string.h>
  35#include <linux/parser.h>
  36#include <linux/vfs.h>
  37#include <linux/random.h>
  38#include <linux/module.h>
  39#include <linux/exportfs.h>
  40#include <linux/slab.h>
  41
  42#include "exofs.h"
  43
  44#define EXOFS_DBGMSG2(M...) do {} while (0)
  45
  46/******************************************************************************
  47 * MOUNT OPTIONS
  48 *****************************************************************************/
  49
  50/*
  51 * struct to hold what we get from mount options
  52 */
  53struct exofs_mountopt {
  54	bool is_osdname;
  55	const char *dev_name;
  56	uint64_t pid;
  57	int timeout;
  58};
  59
  60/*
  61 * exofs-specific mount-time options.
  62 */
  63enum { Opt_name, Opt_pid, Opt_to, Opt_err };
  64
  65/*
  66 * Our mount-time options.  These should ideally be 64-bit unsigned, but the
  67 * kernel's parsing functions do not currently support that.  32-bit should be
  68 * sufficient for most applications now.
  69 */
  70static match_table_t tokens = {
  71	{Opt_name, "osdname=%s"},
  72	{Opt_pid, "pid=%u"},
  73	{Opt_to, "to=%u"},
  74	{Opt_err, NULL}
  75};
  76
  77/*
  78 * The main option parsing method.  Also makes sure that all of the mandatory
  79 * mount options were set.
  80 */
  81static int parse_options(char *options, struct exofs_mountopt *opts)
  82{
  83	char *p;
  84	substring_t args[MAX_OPT_ARGS];
  85	int option;
  86	bool s_pid = false;
  87
  88	EXOFS_DBGMSG("parse_options %s\n", options);
  89	/* defaults */
  90	memset(opts, 0, sizeof(*opts));
  91	opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
  92
  93	while ((p = strsep(&options, ",")) != NULL) {
  94		int token;
  95		char str[32];
  96
  97		if (!*p)
  98			continue;
  99
 100		token = match_token(p, tokens, args);
 101		switch (token) {
 102		case Opt_name:
 103			opts->dev_name = match_strdup(&args[0]);
 104			if (unlikely(!opts->dev_name)) {
 105				EXOFS_ERR("Error allocating dev_name");
 106				return -ENOMEM;
 107			}
 108			opts->is_osdname = true;
 109			break;
 110		case Opt_pid:
 111			if (0 == match_strlcpy(str, &args[0], sizeof(str)))
 112				return -EINVAL;
 113			opts->pid = simple_strtoull(str, NULL, 0);
 114			if (opts->pid < EXOFS_MIN_PID) {
 115				EXOFS_ERR("Partition ID must be >= %u",
 116					  EXOFS_MIN_PID);
 117				return -EINVAL;
 118			}
 119			s_pid = 1;
 120			break;
 121		case Opt_to:
 122			if (match_int(&args[0], &option))
 123				return -EINVAL;
 124			if (option <= 0) {
 125				EXOFS_ERR("Timout must be > 0");
 126				return -EINVAL;
 127			}
 128			opts->timeout = option * HZ;
 129			break;
 130		}
 131	}
 132
 133	if (!s_pid) {
 134		EXOFS_ERR("Need to specify the following options:\n");
 135		EXOFS_ERR("    -o pid=pid_no_to_use\n");
 136		return -EINVAL;
 137	}
 138
 139	return 0;
 140}
 141
 142/******************************************************************************
 143 * INODE CACHE
 144 *****************************************************************************/
 145
 146/*
 147 * Our inode cache.  Isn't it pretty?
 148 */
 149static struct kmem_cache *exofs_inode_cachep;
 150
 151/*
 152 * Allocate an inode in the cache
 153 */
 154static struct inode *exofs_alloc_inode(struct super_block *sb)
 155{
 156	struct exofs_i_info *oi;
 157
 158	oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
 159	if (!oi)
 160		return NULL;
 161
 162	oi->vfs_inode.i_version = 1;
 163	return &oi->vfs_inode;
 164}
 165
 166static void exofs_i_callback(struct rcu_head *head)
 167{
 168	struct inode *inode = container_of(head, struct inode, i_rcu);
 169	kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
 170}
 171
 172/*
 173 * Remove an inode from the cache
 174 */
 175static void exofs_destroy_inode(struct inode *inode)
 176{
 177	call_rcu(&inode->i_rcu, exofs_i_callback);
 178}
 179
 180/*
 181 * Initialize the inode
 182 */
 183static void exofs_init_once(void *foo)
 184{
 185	struct exofs_i_info *oi = foo;
 186
 187	inode_init_once(&oi->vfs_inode);
 188}
 189
 190/*
 191 * Create and initialize the inode cache
 192 */
 193static int init_inodecache(void)
 194{
 195	exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
 196				sizeof(struct exofs_i_info), 0,
 197				SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
 198				exofs_init_once);
 199	if (exofs_inode_cachep == NULL)
 200		return -ENOMEM;
 201	return 0;
 202}
 203
 204/*
 205 * Destroy the inode cache
 206 */
 207static void destroy_inodecache(void)
 208{
 209	kmem_cache_destroy(exofs_inode_cachep);
 210}
 211
 212/******************************************************************************
 213 * Some osd helpers
 214 *****************************************************************************/
 215void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
 216{
 217	osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
 218}
 219
 220static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
 221		    u64 offset, void *p, unsigned length)
 222{
 223	struct osd_request *or = osd_start_request(od, GFP_KERNEL);
 224/*	struct osd_sense_info osi = {.key = 0};*/
 225	int ret;
 226
 227	if (unlikely(!or)) {
 228		EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
 229		return -ENOMEM;
 230	}
 231	ret = osd_req_read_kern(or, obj, offset, p, length);
 232	if (unlikely(ret)) {
 233		EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
 234		goto out;
 235	}
 236
 237	ret = osd_finalize_request(or, 0, cred, NULL);
 238	if (unlikely(ret)) {
 239		EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret);
 240		goto out;
 241	}
 242
 243	ret = osd_execute_request(or);
 244	if (unlikely(ret))
 245		EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
 246	/* osd_req_decode_sense(or, ret); */
 247
 248out:
 249	osd_end_request(or);
 250	EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
 251		      "length=0x%llx dev=%p ret=>%d\n",
 252		      _LLU(obj->id), _LLU(offset), _LLU(length), od, ret);
 253	return ret;
 254}
 255
 256static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
 257	EXOFS_APAGE_SB_DATA,
 258	EXOFS_ATTR_SB_STATS,
 259	sizeof(struct exofs_sb_stats));
 260
 261static int __sbi_read_stats(struct exofs_sb_info *sbi)
 262{
 263	struct osd_attr attrs[] = {
 264		[0] = g_attr_sb_stats,
 265	};
 266	struct ore_io_state *ios;
 267	int ret;
 268
 269	ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
 270	if (unlikely(ret)) {
 271		EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
 272		return ret;
 273	}
 274
 275	ios->in_attr = attrs;
 276	ios->in_attr_len = ARRAY_SIZE(attrs);
 277
 278	ret = ore_read(ios);
 279	if (unlikely(ret)) {
 280		EXOFS_ERR("Error reading super_block stats => %d\n", ret);
 281		goto out;
 282	}
 283
 284	ret = extract_attr_from_ios(ios, &attrs[0]);
 285	if (ret) {
 286		EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
 287		goto out;
 288	}
 289	if (attrs[0].len) {
 290		struct exofs_sb_stats *ess;
 291
 292		if (unlikely(attrs[0].len != sizeof(*ess))) {
 293			EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
 294				  "size(%d) != expected(%zd)\n",
 295				  __func__, attrs[0].len, sizeof(*ess));
 296			goto out;
 297		}
 298
 299		ess = attrs[0].val_ptr;
 300		sbi->s_nextid = le64_to_cpu(ess->s_nextid);
 301		sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
 302	}
 303
 304out:
 305	ore_put_io_state(ios);
 306	return ret;
 307}
 308
 309static void stats_done(struct ore_io_state *ios, void *p)
 310{
 311	ore_put_io_state(ios);
 312	/* Good thanks nothing to do anymore */
 313}
 314
 315/* Asynchronously write the stats attribute */
 316int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
 317{
 318	struct osd_attr attrs[] = {
 319		[0] = g_attr_sb_stats,
 320	};
 321	struct ore_io_state *ios;
 322	int ret;
 323
 324	ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
 325	if (unlikely(ret)) {
 326		EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
 327		return ret;
 328	}
 329
 330	sbi->s_ess.s_nextid   = cpu_to_le64(sbi->s_nextid);
 331	sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
 332	attrs[0].val_ptr = &sbi->s_ess;
 333
 334
 335	ios->done = stats_done;
 336	ios->private = sbi;
 337	ios->out_attr = attrs;
 338	ios->out_attr_len = ARRAY_SIZE(attrs);
 339
 340	ret = ore_write(ios);
 341	if (unlikely(ret)) {
 342		EXOFS_ERR("%s: ore_write failed.\n", __func__);
 343		ore_put_io_state(ios);
 344	}
 345
 346	return ret;
 347}
 348
 349/******************************************************************************
 350 * SUPERBLOCK FUNCTIONS
 351 *****************************************************************************/
 352static const struct super_operations exofs_sops;
 353static const struct export_operations exofs_export_ops;
 354
 355/*
 356 * Write the superblock to the OSD
 357 */
 358static int exofs_sync_fs(struct super_block *sb, int wait)
 359{
 360	struct exofs_sb_info *sbi;
 361	struct exofs_fscb *fscb;
 362	struct ore_comp one_comp;
 363	struct ore_components oc;
 364	struct ore_io_state *ios;
 365	int ret = -ENOMEM;
 366
 367	fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
 368	if (unlikely(!fscb))
 369		return -ENOMEM;
 370
 371	sbi = sb->s_fs_info;
 372
 373	/* NOTE: We no longer dirty the super_block anywhere in exofs. The
 374	 * reason we write the fscb here on unmount is so we can stay backwards
 375	 * compatible with fscb->s_version == 1. (What we are not compatible
 376	 * with is if a new version FS crashed and then we try to mount an old
 377	 * version). Otherwise the exofs_fscb is read-only from mkfs time. All
 378	 * the writeable info is set in exofs_sbi_write_stats() above.
 379	 */
 380
 381	exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID);
 382
 383	ret = ore_get_io_state(&sbi->layout, &oc, &ios);
 384	if (unlikely(ret))
 385		goto out;
 386
 387	lock_super(sb);
 388
 389	ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
 390	memset(fscb, 0, ios->length);
 391	fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
 392	fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles);
 393	fscb->s_magic = cpu_to_le16(sb->s_magic);
 394	fscb->s_newfs = 0;
 395	fscb->s_version = EXOFS_FSCB_VER;
 396
 397	ios->offset = 0;
 398	ios->kern_buff = fscb;
 399
 400	ret = ore_write(ios);
 401	if (unlikely(ret))
 402		EXOFS_ERR("%s: ore_write failed.\n", __func__);
 403	else
 404		sb->s_dirt = 0;
 405
 406
 407	unlock_super(sb);
 408out:
 409	EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
 410	ore_put_io_state(ios);
 411	kfree(fscb);
 412	return ret;
 413}
 414
 415static void exofs_write_super(struct super_block *sb)
 416{
 417	if (!(sb->s_flags & MS_RDONLY))
 418		exofs_sync_fs(sb, 1);
 419	else
 420		sb->s_dirt = 0;
 421}
 422
 423static void _exofs_print_device(const char *msg, const char *dev_path,
 424				struct osd_dev *od, u64 pid)
 425{
 426	const struct osd_dev_info *odi = osduld_device_info(od);
 427
 428	printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
 429		msg, dev_path ?: "", odi->osdname, _LLU(pid));
 430}
 431
 432static void exofs_free_sbi(struct exofs_sb_info *sbi)
 433{
 434	unsigned numdevs = sbi->oc.numdevs;
 435
 436	while (numdevs) {
 437		unsigned i = --numdevs;
 438		struct osd_dev *od = ore_comp_dev(&sbi->oc, i);
 439
 440		if (od) {
 441			ore_comp_set_dev(&sbi->oc, i, NULL);
 442			osduld_put_device(od);
 443		}
 444	}
 445	kfree(sbi->oc.ods);
 446	kfree(sbi);
 447}
 448
 449/*
 450 * This function is called when the vfs is freeing the superblock.  We just
 451 * need to free our own part.
 452 */
 453static void exofs_put_super(struct super_block *sb)
 454{
 455	int num_pend;
 456	struct exofs_sb_info *sbi = sb->s_fs_info;
 457
 458	/* make sure there are no pending commands */
 459	for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
 460	     num_pend = atomic_read(&sbi->s_curr_pending)) {
 461		wait_queue_head_t wq;
 462
 463		printk(KERN_NOTICE "%s: !!Pending operations in flight. "
 464		       "This is a BUG. please report to osd-dev@open-osd.org\n",
 465		       __func__);
 466		init_waitqueue_head(&wq);
 467		wait_event_timeout(wq,
 468				  (atomic_read(&sbi->s_curr_pending) == 0),
 469				  msecs_to_jiffies(100));
 470	}
 471
 472	_exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0),
 473			    sbi->one_comp.obj.partition);
 474
 475	exofs_sysfs_sb_del(sbi);
 476	bdi_destroy(&sbi->bdi);
 477	exofs_free_sbi(sbi);
 478	sb->s_fs_info = NULL;
 479}
 480
 481static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
 482				    struct exofs_device_table *dt)
 483{
 484	int ret;
 485
 486	sbi->layout.stripe_unit =
 487				le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
 488	sbi->layout.group_width =
 489				le32_to_cpu(dt->dt_data_map.cb_group_width);
 490	sbi->layout.group_depth =
 491				le32_to_cpu(dt->dt_data_map.cb_group_depth);
 492	sbi->layout.mirrors_p1  =
 493				le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;
 494	sbi->layout.raid_algorithm  =
 495				le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
 496
 497	ret = ore_verify_layout(numdevs, &sbi->layout);
 498
 499	EXOFS_DBGMSG("exofs: layout: "
 500		"num_comps=%u stripe_unit=0x%x group_width=%u "
 501		"group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n",
 502		numdevs,
 503		sbi->layout.stripe_unit,
 504		sbi->layout.group_width,
 505		_LLU(sbi->layout.group_depth),
 506		sbi->layout.mirrors_p1,
 507		sbi->layout.raid_algorithm);
 508	return ret;
 509}
 510
 511static unsigned __ra_pages(struct ore_layout *layout)
 512{
 513	const unsigned _MIN_RA = 32; /* min 128K read-ahead */
 514	unsigned ra_pages = layout->group_width * layout->stripe_unit /
 515				PAGE_SIZE;
 516	unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
 517
 518	ra_pages *= 2; /* two stripes */
 519	if (ra_pages < _MIN_RA)
 520		ra_pages = roundup(_MIN_RA, ra_pages / 2);
 521
 522	if (ra_pages > max_io_pages)
 523		ra_pages = max_io_pages;
 524
 525	return ra_pages;
 526}
 527
 528/* @odi is valid only as long as @fscb_dev is valid */
 529static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
 530			     struct osd_dev_info *odi)
 531{
 532	odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
 533	if (likely(odi->systemid_len))
 534		memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN);
 535
 536	odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
 537	odi->osdname = dt_dev->osdname;
 538
 539	/* FIXME support long names. Will need a _put function */
 540	if (dt_dev->long_name_offset)
 541		return -EINVAL;
 542
 543	/* Make sure osdname is printable!
 544	 * mkexofs should give us space for a null-terminator else the
 545	 * device-table is invalid.
 546	 */
 547	if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
 548		odi->osdname_len = sizeof(dt_dev->osdname) - 1;
 549	dt_dev->osdname[odi->osdname_len] = 0;
 550
 551	/* If it's all zeros something is bad we read past end-of-obj */
 552	return !(odi->systemid_len || odi->osdname_len);
 553}
 554
 555int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs,
 556		      struct exofs_dev **peds)
 557{
 558	struct __alloc_ore_devs_and_exofs_devs {
 559		/* Twice bigger table: See exofs_init_comps() and comment at
 560		 * exofs_read_lookup_dev_table()
 561		 */
 562		struct ore_dev *oreds[numdevs * 2 - 1];
 563		struct exofs_dev eds[numdevs];
 564	} *aoded;
 565	struct exofs_dev *eds;
 566	unsigned i;
 567
 568	aoded = kzalloc(sizeof(*aoded), GFP_KERNEL);
 569	if (unlikely(!aoded)) {
 570		EXOFS_ERR("ERROR: failed allocating Device array[%d]\n",
 571			  numdevs);
 572		return -ENOMEM;
 573	}
 574
 575	sbi->oc.ods = aoded->oreds;
 576	*peds = eds = aoded->eds;
 577	for (i = 0; i < numdevs; ++i)
 578		aoded->oreds[i] = &eds[i].ored;
 579	return 0;
 580}
 581
 582static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi,
 583				       struct osd_dev *fscb_od,
 584				       unsigned table_count)
 585{
 586	struct ore_comp comp;
 587	struct exofs_device_table *dt;
 588	struct exofs_dev *eds;
 589	unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
 590					     sizeof(*dt);
 591	unsigned numdevs, i;
 592	int ret;
 593
 594	dt = kmalloc(table_bytes, GFP_KERNEL);
 595	if (unlikely(!dt)) {
 596		EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
 597			  table_bytes);
 598		return -ENOMEM;
 599	}
 600
 601	sbi->oc.numdevs = 0;
 602
 603	comp.obj.partition = sbi->one_comp.obj.partition;
 604	comp.obj.id = EXOFS_DEVTABLE_ID;
 605	exofs_make_credential(comp.cred, &comp.obj);
 606
 607	ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt,
 608			      table_bytes);
 609	if (unlikely(ret)) {
 610		EXOFS_ERR("ERROR: reading device table\n");
 611		goto out;
 612	}
 613
 614	numdevs = le64_to_cpu(dt->dt_num_devices);
 615	if (unlikely(!numdevs)) {
 616		ret = -EINVAL;
 617		goto out;
 618	}
 619	WARN_ON(table_count != numdevs);
 620
 621	ret = _read_and_match_data_map(sbi, numdevs, dt);
 622	if (unlikely(ret))
 623		goto out;
 624
 625	ret = __alloc_dev_table(sbi, numdevs, &eds);
 626	if (unlikely(ret))
 627		goto out;
 628	/* exofs round-robins the device table view according to inode
 629	 * number. We hold a: twice bigger table hence inodes can point
 630	 * to any device and have a sequential view of the table
 631	 * starting at this device. See exofs_init_comps()
 632	 */
 633	memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0],
 634		(numdevs - 1) * sizeof(sbi->oc.ods[0]));
 635
 636	/* create sysfs subdir under which we put the device table
 637	 * And cluster layout. A Superblock is identified by the string:
 638	 *	"dev[0].osdname"_"pid"
 639	 */
 640	exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]);
 641
 642	for (i = 0; i < numdevs; i++) {
 643		struct exofs_fscb fscb;
 644		struct osd_dev_info odi;
 645		struct osd_dev *od;
 646
 647		if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
 648			EXOFS_ERR("ERROR: Read all-zeros device entry\n");
 649			ret = -EINVAL;
 650			goto out;
 651		}
 652
 653		printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
 654		       i, odi.osdname);
 655
 656		/* the exofs id is currently the table index */
 657		eds[i].did = i;
 658
 659		/* On all devices the device table is identical. The user can
 660		 * specify any one of the participating devices on the command
 661		 * line. We always keep them in device-table order.
 662		 */
 663		if (fscb_od && osduld_device_same(fscb_od, &odi)) {
 664			eds[i].ored.od = fscb_od;
 665			++sbi->oc.numdevs;
 666			fscb_od = NULL;
 667			exofs_sysfs_odev_add(&eds[i], sbi);
 668			continue;
 669		}
 670
 671		od = osduld_info_lookup(&odi);
 672		if (IS_ERR(od)) {
 673			ret = PTR_ERR(od);
 674			EXOFS_ERR("ERROR: device requested is not found "
 675				  "osd_name-%s =>%d\n", odi.osdname, ret);
 676			goto out;
 677		}
 678
 679		eds[i].ored.od = od;
 680		++sbi->oc.numdevs;
 681
 682		/* Read the fscb of the other devices to make sure the FS
 683		 * partition is there.
 684		 */
 685		ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb,
 686				      sizeof(fscb));
 687		if (unlikely(ret)) {
 688			EXOFS_ERR("ERROR: Malformed participating device "
 689				  "error reading fscb osd_name-%s\n",
 690				  odi.osdname);
 691			goto out;
 692		}
 693		exofs_sysfs_odev_add(&eds[i], sbi);
 694
 695		/* TODO: verify other information is correct and FS-uuid
 696		 *	 matches. Benny what did you say about device table
 697		 *	 generation and old devices?
 698		 */
 699	}
 700
 701out:
 702	kfree(dt);
 703	if (unlikely(fscb_od && !ret)) {
 704			EXOFS_ERR("ERROR: Bad device-table container device not present\n");
 705			osduld_put_device(fscb_od);
 706			return -EINVAL;
 707	}
 708	return ret;
 709}
 710
 711/*
 712 * Read the superblock from the OSD and fill in the fields
 713 */
 714static int exofs_fill_super(struct super_block *sb, void *data, int silent)
 715{
 716	struct inode *root;
 717	struct exofs_mountopt *opts = data;
 718	struct exofs_sb_info *sbi;	/*extended info                  */
 719	struct osd_dev *od;		/* Master device                 */
 720	struct exofs_fscb fscb;		/*on-disk superblock info        */
 721	struct ore_comp comp;
 722	unsigned table_count;
 723	int ret;
 724
 725	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 726	if (!sbi)
 727		return -ENOMEM;
 728
 729	/* use mount options to fill superblock */
 730	if (opts->is_osdname) {
 731		struct osd_dev_info odi = {.systemid_len = 0};
 732
 733		odi.osdname_len = strlen(opts->dev_name);
 734		odi.osdname = (u8 *)opts->dev_name;
 735		od = osduld_info_lookup(&odi);
 736		kfree(opts->dev_name);
 737		opts->dev_name = NULL;
 738	} else {
 739		od = osduld_path_lookup(opts->dev_name);
 740	}
 741	if (IS_ERR(od)) {
 742		ret = -EINVAL;
 743		goto free_sbi;
 744	}
 745
 746	/* Default layout in case we do not have a device-table */
 747	sbi->layout.stripe_unit = PAGE_SIZE;
 748	sbi->layout.mirrors_p1 = 1;
 749	sbi->layout.group_width = 1;
 750	sbi->layout.group_depth = -1;
 751	sbi->layout.group_count = 1;
 752	sbi->s_timeout = opts->timeout;
 753
 754	sbi->one_comp.obj.partition = opts->pid;
 755	sbi->one_comp.obj.id = 0;
 756	exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj);
 757	sbi->oc.single_comp = EC_SINGLE_COMP;
 758	sbi->oc.comps = &sbi->one_comp;
 759
 760	/* fill in some other data by hand */
 761	memset(sb->s_id, 0, sizeof(sb->s_id));
 762	strcpy(sb->s_id, "exofs");
 763	sb->s_blocksize = EXOFS_BLKSIZE;
 764	sb->s_blocksize_bits = EXOFS_BLKSHIFT;
 765	sb->s_maxbytes = MAX_LFS_FILESIZE;
 766	sb->s_max_links = EXOFS_LINK_MAX;
 767	atomic_set(&sbi->s_curr_pending, 0);
 768	sb->s_bdev = NULL;
 769	sb->s_dev = 0;
 770
 771	comp.obj.partition = sbi->one_comp.obj.partition;
 772	comp.obj.id = EXOFS_SUPER_ID;
 773	exofs_make_credential(comp.cred, &comp.obj);
 774
 775	ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb));
 776	if (unlikely(ret))
 777		goto free_sbi;
 778
 779	sb->s_magic = le16_to_cpu(fscb.s_magic);
 780	/* NOTE: we read below to be backward compatible with old versions */
 781	sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
 782	sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
 783
 784	/* make sure what we read from the object store is correct */
 785	if (sb->s_magic != EXOFS_SUPER_MAGIC) {
 786		if (!silent)
 787			EXOFS_ERR("ERROR: Bad magic value\n");
 788		ret = -EINVAL;
 789		goto free_sbi;
 790	}
 791	if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
 792		EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
 793			  EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
 794		ret = -EINVAL;
 795		goto free_sbi;
 796	}
 797
 798	/* start generation numbers from a random point */
 799	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 800	spin_lock_init(&sbi->s_next_gen_lock);
 801
 802	table_count = le64_to_cpu(fscb.s_dev_table_count);
 803	if (table_count) {
 804		ret = exofs_read_lookup_dev_table(sbi, od, table_count);
 805		if (unlikely(ret))
 806			goto free_sbi;
 807	} else {
 808		struct exofs_dev *eds;
 809
 810		ret = __alloc_dev_table(sbi, 1, &eds);
 811		if (unlikely(ret))
 812			goto free_sbi;
 813
 814		ore_comp_set_dev(&sbi->oc, 0, od);
 815		sbi->oc.numdevs = 1;
 816	}
 817
 818	__sbi_read_stats(sbi);
 819
 820	/* set up operation vectors */
 821	sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
 822	sb->s_bdi = &sbi->bdi;
 823	sb->s_fs_info = sbi;
 824	sb->s_op = &exofs_sops;
 825	sb->s_export_op = &exofs_export_ops;
 826	root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
 827	if (IS_ERR(root)) {
 828		EXOFS_ERR("ERROR: exofs_iget failed\n");
 829		ret = PTR_ERR(root);
 830		goto free_sbi;
 831	}
 832	sb->s_root = d_make_root(root);
 833	if (!sb->s_root) {
 834		EXOFS_ERR("ERROR: get root inode failed\n");
 835		ret = -ENOMEM;
 836		goto free_sbi;
 837	}
 838
 839	if (!S_ISDIR(root->i_mode)) {
 840		dput(sb->s_root);
 841		sb->s_root = NULL;
 842		EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
 843		       root->i_mode);
 844		ret = -EINVAL;
 845		goto free_sbi;
 846	}
 847
 848	ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
 849	if (ret) {
 850		EXOFS_DBGMSG("Failed to bdi_setup_and_register\n");
 851		dput(sb->s_root);
 852		sb->s_root = NULL;
 853		goto free_sbi;
 854	}
 855
 856	exofs_sysfs_dbg_print();
 857	_exofs_print_device("Mounting", opts->dev_name,
 858			    ore_comp_dev(&sbi->oc, 0),
 859			    sbi->one_comp.obj.partition);
 860	return 0;
 861
 862free_sbi:
 863	EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
 864		  opts->dev_name, sbi->one_comp.obj.partition, ret);
 865	exofs_free_sbi(sbi);
 866	return ret;
 867}
 868
 869/*
 870 * Set up the superblock (calls exofs_fill_super eventually)
 871 */
 872static struct dentry *exofs_mount(struct file_system_type *type,
 873			  int flags, const char *dev_name,
 874			  void *data)
 875{
 876	struct exofs_mountopt opts;
 877	int ret;
 878
 879	ret = parse_options(data, &opts);
 880	if (ret)
 881		return ERR_PTR(ret);
 882
 883	if (!opts.dev_name)
 884		opts.dev_name = dev_name;
 885	return mount_nodev(type, flags, &opts, exofs_fill_super);
 886}
 887
 888/*
 889 * Return information about the file system state in the buffer.  This is used
 890 * by the 'df' command, for example.
 891 */
 892static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
 893{
 894	struct super_block *sb = dentry->d_sb;
 895	struct exofs_sb_info *sbi = sb->s_fs_info;
 896	struct ore_io_state *ios;
 897	struct osd_attr attrs[] = {
 898		ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
 899			OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
 900		ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
 901			OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
 902	};
 903	uint64_t capacity = ULLONG_MAX;
 904	uint64_t used = ULLONG_MAX;
 905	int ret;
 906
 907	ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios);
 908	if (ret) {
 909		EXOFS_DBGMSG("ore_get_io_state failed.\n");
 910		return ret;
 911	}
 912
 913	ios->in_attr = attrs;
 914	ios->in_attr_len = ARRAY_SIZE(attrs);
 915
 916	ret = ore_read(ios);
 917	if (unlikely(ret))
 918		goto out;
 919
 920	ret = extract_attr_from_ios(ios, &attrs[0]);
 921	if (likely(!ret)) {
 922		capacity = get_unaligned_be64(attrs[0].val_ptr);
 923		if (unlikely(!capacity))
 924			capacity = ULLONG_MAX;
 925	} else
 926		EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
 927
 928	ret = extract_attr_from_ios(ios, &attrs[1]);
 929	if (likely(!ret))
 930		used = get_unaligned_be64(attrs[1].val_ptr);
 931	else
 932		EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
 933
 934	/* fill in the stats buffer */
 935	buf->f_type = EXOFS_SUPER_MAGIC;
 936	buf->f_bsize = EXOFS_BLKSIZE;
 937	buf->f_blocks = capacity >> 9;
 938	buf->f_bfree = (capacity - used) >> 9;
 939	buf->f_bavail = buf->f_bfree;
 940	buf->f_files = sbi->s_numfiles;
 941	buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
 942	buf->f_namelen = EXOFS_NAME_LEN;
 943
 944out:
 945	ore_put_io_state(ios);
 946	return ret;
 947}
 948
 949static const struct super_operations exofs_sops = {
 950	.alloc_inode    = exofs_alloc_inode,
 951	.destroy_inode  = exofs_destroy_inode,
 952	.write_inode    = exofs_write_inode,
 953	.evict_inode    = exofs_evict_inode,
 954	.put_super      = exofs_put_super,
 955	.write_super    = exofs_write_super,
 956	.sync_fs	= exofs_sync_fs,
 957	.statfs         = exofs_statfs,
 958};
 959
 960/******************************************************************************
 961 * EXPORT OPERATIONS
 962 *****************************************************************************/
 963
 964static struct dentry *exofs_get_parent(struct dentry *child)
 965{
 966	unsigned long ino = exofs_parent_ino(child);
 967
 968	if (!ino)
 969		return ERR_PTR(-ESTALE);
 970
 971	return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
 972}
 973
 974static struct inode *exofs_nfs_get_inode(struct super_block *sb,
 975		u64 ino, u32 generation)
 976{
 977	struct inode *inode;
 978
 979	inode = exofs_iget(sb, ino);
 980	if (IS_ERR(inode))
 981		return ERR_CAST(inode);
 982	if (generation && inode->i_generation != generation) {
 983		/* we didn't find the right inode.. */
 984		iput(inode);
 985		return ERR_PTR(-ESTALE);
 986	}
 987	return inode;
 988}
 989
 990static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
 991				struct fid *fid, int fh_len, int fh_type)
 992{
 993	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 994				    exofs_nfs_get_inode);
 995}
 996
 997static struct dentry *exofs_fh_to_parent(struct super_block *sb,
 998				struct fid *fid, int fh_len, int fh_type)
 999{
1000	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1001				    exofs_nfs_get_inode);
1002}
1003
1004static const struct export_operations exofs_export_ops = {
1005	.fh_to_dentry = exofs_fh_to_dentry,
1006	.fh_to_parent = exofs_fh_to_parent,
1007	.get_parent = exofs_get_parent,
1008};
1009
1010/******************************************************************************
1011 * INSMOD/RMMOD
1012 *****************************************************************************/
1013
1014/*
1015 * struct that describes this file system
1016 */
1017static struct file_system_type exofs_type = {
1018	.owner          = THIS_MODULE,
1019	.name           = "exofs",
1020	.mount          = exofs_mount,
1021	.kill_sb        = generic_shutdown_super,
1022};
1023
1024static int __init init_exofs(void)
1025{
1026	int err;
1027
1028	err = init_inodecache();
1029	if (err)
1030		goto out;
1031
1032	err = register_filesystem(&exofs_type);
1033	if (err)
1034		goto out_d;
1035
1036	/* We don't fail if sysfs creation failed */
1037	exofs_sysfs_init();
1038
1039	return 0;
1040out_d:
1041	destroy_inodecache();
1042out:
1043	return err;
1044}
1045
1046static void __exit exit_exofs(void)
1047{
1048	exofs_sysfs_uninit();
1049	unregister_filesystem(&exofs_type);
1050	destroy_inodecache();
1051}
1052
1053MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
1054MODULE_DESCRIPTION("exofs");
1055MODULE_LICENSE("GPL");
1056
1057module_init(init_exofs)
1058module_exit(exit_exofs)