1/*
   2 *  linux/fs/isofs/inode.c
   3 *
   4 *  (C) 1991  Linus Torvalds - minix filesystem
   5 *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
   6 *      1994  Eberhard Mönkeberg - multi session handling.
   7 *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
   8 *	1997  Gordon Chaffee - Joliet CDs
   9 *	1998  Eric Lammerts - ISO 9660 Level 3
  10 *	2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
  11 *	2004  Paul Serice - NFS Export Operations
  12 */
  13
  14#include <linux/init.h>
  15#include <linux/module.h>
  16
  17#include <linux/slab.h>
  18#include <linux/nls.h>
  19#include <linux/ctype.h>
  20#include <linux/statfs.h>
  21#include <linux/cdrom.h>
  22#include <linux/parser.h>
  23#include <linux/mpage.h>
  24
  25#include "isofs.h"
  26#include "zisofs.h"
  27
  28#define BEQUIET
  29
  30static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
  31		struct qstr *qstr);
  32static int isofs_hash(const struct dentry *parent, const struct inode *inode,
  33		struct qstr *qstr);
  34static int isofs_dentry_cmpi(const struct dentry *parent,
  35		const struct inode *pinode,
  36		const struct dentry *dentry, const struct inode *inode,
  37		unsigned int len, const char *str, const struct qstr *name);
  38static int isofs_dentry_cmp(const struct dentry *parent,
  39		const struct inode *pinode,
  40		const struct dentry *dentry, const struct inode *inode,
  41		unsigned int len, const char *str, const struct qstr *name);
  42
  43#ifdef CONFIG_JOLIET
  44static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
  45		struct qstr *qstr);
  46static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
  47		struct qstr *qstr);
  48static int isofs_dentry_cmpi_ms(const struct dentry *parent,
  49		const struct inode *pinode,
  50		const struct dentry *dentry, const struct inode *inode,
  51		unsigned int len, const char *str, const struct qstr *name);
  52static int isofs_dentry_cmp_ms(const struct dentry *parent,
  53		const struct inode *pinode,
  54		const struct dentry *dentry, const struct inode *inode,
  55		unsigned int len, const char *str, const struct qstr *name);
  56#endif
  57
  58static void isofs_put_super(struct super_block *sb)
  59{
  60	struct isofs_sb_info *sbi = ISOFS_SB(sb);
  61
  62#ifdef CONFIG_JOLIET
  63	unload_nls(sbi->s_nls_iocharset);
  64#endif
  65
  66	kfree(sbi);
  67	sb->s_fs_info = NULL;
  68	return;
  69}
  70
  71static int isofs_read_inode(struct inode *);
  72static int isofs_statfs (struct dentry *, struct kstatfs *);
  73
  74static struct kmem_cache *isofs_inode_cachep;
  75
  76static struct inode *isofs_alloc_inode(struct super_block *sb)
  77{
  78	struct iso_inode_info *ei;
  79	ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  80	if (!ei)
  81		return NULL;
  82	return &ei->vfs_inode;
  83}
  84
  85static void isofs_i_callback(struct rcu_head *head)
  86{
  87	struct inode *inode = container_of(head, struct inode, i_rcu);
 
  88	kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  89}
  90
  91static void isofs_destroy_inode(struct inode *inode)
  92{
  93	call_rcu(&inode->i_rcu, isofs_i_callback);
  94}
  95
  96static void init_once(void *foo)
  97{
  98	struct iso_inode_info *ei = foo;
  99
 100	inode_init_once(&ei->vfs_inode);
 101}
 102
 103static int init_inodecache(void)
 104{
 105	isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
 106					sizeof(struct iso_inode_info),
 107					0, (SLAB_RECLAIM_ACCOUNT|
 108					SLAB_MEM_SPREAD),
 109					init_once);
 110	if (isofs_inode_cachep == NULL)
 111		return -ENOMEM;
 112	return 0;
 113}
 114
 115static void destroy_inodecache(void)
 116{
 117	kmem_cache_destroy(isofs_inode_cachep);
 118}
 119
 120static int isofs_remount(struct super_block *sb, int *flags, char *data)
 121{
 122	/* we probably want a lot more here */
 123	*flags |= MS_RDONLY;
 124	return 0;
 125}
 126
 127static const struct super_operations isofs_sops = {
 128	.alloc_inode	= isofs_alloc_inode,
 129	.destroy_inode	= isofs_destroy_inode,
 130	.put_super	= isofs_put_super,
 131	.statfs		= isofs_statfs,
 132	.remount_fs	= isofs_remount,
 133	.show_options	= generic_show_options,
 134};
 135
 136
 137static const struct dentry_operations isofs_dentry_ops[] = {
 138	{
 139		.d_hash		= isofs_hash,
 140		.d_compare	= isofs_dentry_cmp,
 141	},
 142	{
 143		.d_hash		= isofs_hashi,
 144		.d_compare	= isofs_dentry_cmpi,
 145	},
 146#ifdef CONFIG_JOLIET
 147	{
 148		.d_hash		= isofs_hash_ms,
 149		.d_compare	= isofs_dentry_cmp_ms,
 150	},
 151	{
 152		.d_hash		= isofs_hashi_ms,
 153		.d_compare	= isofs_dentry_cmpi_ms,
 154	},
 155#endif
 156};
 157
 158struct iso9660_options{
 159	unsigned int rock:1;
 160	unsigned int joliet:1;
 161	unsigned int cruft:1;
 162	unsigned int hide:1;
 163	unsigned int showassoc:1;
 164	unsigned int nocompress:1;
 165	unsigned int overriderockperm:1;
 166	unsigned int uid_set:1;
 167	unsigned int gid_set:1;
 168	unsigned int utf8:1;
 169	unsigned char map;
 170	unsigned char check;
 171	unsigned int blocksize;
 172	umode_t fmode;
 173	umode_t dmode;
 174	gid_t gid;
 175	uid_t uid;
 176	char *iocharset;
 177	/* LVE */
 178	s32 session;
 179	s32 sbsector;
 180};
 181
 182/*
 183 * Compute the hash for the isofs name corresponding to the dentry.
 184 */
 185static int
 186isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 187{
 188	const char *name;
 189	int len;
 190
 191	len = qstr->len;
 192	name = qstr->name;
 193	if (ms) {
 194		while (len && name[len-1] == '.')
 195			len--;
 196	}
 197
 198	qstr->hash = full_name_hash(name, len);
 199
 200	return 0;
 201}
 202
 203/*
 204 * Compute the hash for the isofs name corresponding to the dentry.
 205 */
 206static int
 207isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 208{
 209	const char *name;
 210	int len;
 211	char c;
 212	unsigned long hash;
 213
 214	len = qstr->len;
 215	name = qstr->name;
 216	if (ms) {
 217		while (len && name[len-1] == '.')
 218			len--;
 219	}
 220
 221	hash = init_name_hash();
 222	while (len--) {
 223		c = tolower(*name++);
 224		hash = partial_name_hash(c, hash);
 225	}
 226	qstr->hash = end_name_hash(hash);
 227
 228	return 0;
 229}
 230
 231/*
 232 * Compare of two isofs names.
 233 */
 234static int isofs_dentry_cmp_common(
 235		unsigned int len, const char *str,
 236		const struct qstr *name, int ms, int ci)
 237{
 238	int alen, blen;
 239
 240	/* A filename cannot end in '.' or we treat it like it has none */
 241	alen = name->len;
 242	blen = len;
 243	if (ms) {
 244		while (alen && name->name[alen-1] == '.')
 245			alen--;
 246		while (blen && str[blen-1] == '.')
 247			blen--;
 248	}
 249	if (alen == blen) {
 250		if (ci) {
 251			if (strnicmp(name->name, str, alen) == 0)
 252				return 0;
 253		} else {
 254			if (strncmp(name->name, str, alen) == 0)
 255				return 0;
 256		}
 257	}
 258	return 1;
 259}
 260
 261static int
 262isofs_hash(const struct dentry *dentry, const struct inode *inode,
 263		struct qstr *qstr)
 264{
 265	return isofs_hash_common(dentry, qstr, 0);
 266}
 267
 268static int
 269isofs_hashi(const struct dentry *dentry, const struct inode *inode,
 270		struct qstr *qstr)
 271{
 272	return isofs_hashi_common(dentry, qstr, 0);
 273}
 274
 275static int
 276isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
 277		const struct dentry *dentry, const struct inode *inode,
 278		unsigned int len, const char *str, const struct qstr *name)
 279{
 280	return isofs_dentry_cmp_common(len, str, name, 0, 0);
 281}
 282
 283static int
 284isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
 285		const struct dentry *dentry, const struct inode *inode,
 286		unsigned int len, const char *str, const struct qstr *name)
 287{
 288	return isofs_dentry_cmp_common(len, str, name, 0, 1);
 289}
 290
 291#ifdef CONFIG_JOLIET
 292static int
 293isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
 294		struct qstr *qstr)
 295{
 296	return isofs_hash_common(dentry, qstr, 1);
 297}
 298
 299static int
 300isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
 301		struct qstr *qstr)
 302{
 303	return isofs_hashi_common(dentry, qstr, 1);
 304}
 305
 306static int
 307isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
 308		const struct dentry *dentry, const struct inode *inode,
 309		unsigned int len, const char *str, const struct qstr *name)
 310{
 311	return isofs_dentry_cmp_common(len, str, name, 1, 0);
 312}
 313
 314static int
 315isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
 316		const struct dentry *dentry, const struct inode *inode,
 317		unsigned int len, const char *str, const struct qstr *name)
 318{
 319	return isofs_dentry_cmp_common(len, str, name, 1, 1);
 320}
 321#endif
 322
 323enum {
 324	Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 325	Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 326	Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 327	Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 328};
 329
 330static const match_table_t tokens = {
 331	{Opt_norock, "norock"},
 332	{Opt_nojoliet, "nojoliet"},
 333	{Opt_unhide, "unhide"},
 334	{Opt_hide, "hide"},
 335	{Opt_showassoc, "showassoc"},
 336	{Opt_cruft, "cruft"},
 337	{Opt_utf8, "utf8"},
 338	{Opt_iocharset, "iocharset=%s"},
 339	{Opt_map_a, "map=acorn"},
 340	{Opt_map_a, "map=a"},
 341	{Opt_map_n, "map=normal"},
 342	{Opt_map_n, "map=n"},
 343	{Opt_map_o, "map=off"},
 344	{Opt_map_o, "map=o"},
 345	{Opt_session, "session=%u"},
 346	{Opt_sb, "sbsector=%u"},
 347	{Opt_check_r, "check=relaxed"},
 348	{Opt_check_r, "check=r"},
 349	{Opt_check_s, "check=strict"},
 350	{Opt_check_s, "check=s"},
 351	{Opt_uid, "uid=%u"},
 352	{Opt_gid, "gid=%u"},
 353	{Opt_mode, "mode=%u"},
 354	{Opt_dmode, "dmode=%u"},
 355	{Opt_overriderockperm, "overriderockperm"},
 356	{Opt_block, "block=%u"},
 357	{Opt_ignore, "conv=binary"},
 358	{Opt_ignore, "conv=b"},
 359	{Opt_ignore, "conv=text"},
 360	{Opt_ignore, "conv=t"},
 361	{Opt_ignore, "conv=mtext"},
 362	{Opt_ignore, "conv=m"},
 363	{Opt_ignore, "conv=auto"},
 364	{Opt_ignore, "conv=a"},
 365	{Opt_nocompress, "nocompress"},
 366	{Opt_err, NULL}
 367};
 368
 369static int parse_options(char *options, struct iso9660_options *popt)
 370{
 371	char *p;
 372	int option;
 373
 374	popt->map = 'n';
 375	popt->rock = 1;
 376	popt->joliet = 1;
 377	popt->cruft = 0;
 378	popt->hide = 0;
 379	popt->showassoc = 0;
 380	popt->check = 'u';		/* unset */
 381	popt->nocompress = 0;
 382	popt->blocksize = 1024;
 383	popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 384	popt->uid_set = 0;
 385	popt->gid_set = 0;
 386	popt->gid = 0;
 387	popt->uid = 0;
 388	popt->iocharset = NULL;
 389	popt->utf8 = 0;
 390	popt->overriderockperm = 0;
 391	popt->session=-1;
 392	popt->sbsector=-1;
 393	if (!options)
 394		return 1;
 395
 396	while ((p = strsep(&options, ",")) != NULL) {
 397		int token;
 398		substring_t args[MAX_OPT_ARGS];
 399		unsigned n;
 400
 401		if (!*p)
 402			continue;
 403
 404		token = match_token(p, tokens, args);
 405		switch (token) {
 406		case Opt_norock:
 407			popt->rock = 0;
 408			break;
 409		case Opt_nojoliet:
 410			popt->joliet = 0;
 411			break;
 412		case Opt_hide:
 413			popt->hide = 1;
 414			break;
 415		case Opt_unhide:
 416		case Opt_showassoc:
 417			popt->showassoc = 1;
 418			break;
 419		case Opt_cruft:
 420			popt->cruft = 1;
 421			break;
 422		case Opt_utf8:
 423			popt->utf8 = 1;
 424			break;
 425#ifdef CONFIG_JOLIET
 426		case Opt_iocharset:
 427			popt->iocharset = match_strdup(&args[0]);
 428			break;
 429#endif
 430		case Opt_map_a:
 431			popt->map = 'a';
 432			break;
 433		case Opt_map_o:
 434			popt->map = 'o';
 435			break;
 436		case Opt_map_n:
 437			popt->map = 'n';
 438			break;
 439		case Opt_session:
 440			if (match_int(&args[0], &option))
 441				return 0;
 442			n = option;
 443			if (n > 99)
 444				return 0;
 445			popt->session = n + 1;
 446			break;
 447		case Opt_sb:
 448			if (match_int(&args[0], &option))
 449				return 0;
 450			popt->sbsector = option;
 451			break;
 452		case Opt_check_r:
 453			popt->check = 'r';
 454			break;
 455		case Opt_check_s:
 456			popt->check = 's';
 457			break;
 458		case Opt_ignore:
 459			break;
 460		case Opt_uid:
 461			if (match_int(&args[0], &option))
 462				return 0;
 463			popt->uid = option;
 464			popt->uid_set = 1;
 465			break;
 466		case Opt_gid:
 467			if (match_int(&args[0], &option))
 468				return 0;
 469			popt->gid = option;
 470			popt->gid_set = 1;
 471			break;
 472		case Opt_mode:
 473			if (match_int(&args[0], &option))
 474				return 0;
 475			popt->fmode = option;
 476			break;
 477		case Opt_dmode:
 478			if (match_int(&args[0], &option))
 479				return 0;
 480			popt->dmode = option;
 481			break;
 482		case Opt_overriderockperm:
 483			popt->overriderockperm = 1;
 484			break;
 485		case Opt_block:
 486			if (match_int(&args[0], &option))
 487				return 0;
 488			n = option;
 489			if (n != 512 && n != 1024 && n != 2048)
 490				return 0;
 491			popt->blocksize = n;
 492			break;
 493		case Opt_nocompress:
 494			popt->nocompress = 1;
 495			break;
 496		default:
 497			return 0;
 498		}
 499	}
 500	return 1;
 501}
 502
 503/*
 504 * look if the driver can tell the multi session redirection value
 505 *
 506 * don't change this if you don't know what you do, please!
 507 * Multisession is legal only with XA disks.
 508 * A non-XA disk with more than one volume descriptor may do it right, but
 509 * usually is written in a nowhere standardized "multi-partition" manner.
 510 * Multisession uses absolute addressing (solely the first frame of the whole
 511 * track is #0), multi-partition uses relative addressing (each first frame of
 512 * each track is #0), and a track is not a session.
 513 *
 514 * A broken CDwriter software or drive firmware does not set new standards,
 515 * at least not if conflicting with the existing ones.
 516 *
 517 * emoenke@gwdg.de
 518 */
 519#define WE_OBEY_THE_WRITTEN_STANDARDS 1
 520
 521static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 522{
 523	struct cdrom_multisession ms_info;
 524	unsigned int vol_desc_start;
 525	struct block_device *bdev = sb->s_bdev;
 526	int i;
 527
 528	vol_desc_start=0;
 529	ms_info.addr_format=CDROM_LBA;
 530	if(session >= 0 && session <= 99) {
 531		struct cdrom_tocentry Te;
 532		Te.cdte_track=session;
 533		Te.cdte_format=CDROM_LBA;
 534		i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 535		if (!i) {
 536			printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 537				session, Te.cdte_addr.lba,
 538				Te.cdte_ctrl&CDROM_DATA_TRACK);
 539			if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 540				return Te.cdte_addr.lba;
 541		}
 542
 543		printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 544	}
 545	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 546	if (session > 0)
 547		printk(KERN_ERR "ISOFS: Invalid session number\n");
 548#if 0
 549	printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 550	if (i==0) {
 551		printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 552		printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 553	}
 554#endif
 555	if (i==0)
 556#if WE_OBEY_THE_WRITTEN_STANDARDS
 557		if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 558#endif
 559			vol_desc_start=ms_info.addr.lba;
 560	return vol_desc_start;
 561}
 562
 563/*
 564 * Check if root directory is empty (has less than 3 files).
 565 *
 566 * Used to detect broken CDs where ISO root directory is empty but Joliet root
 567 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
 568 * (and Joliet used instead) or else no files would be visible.
 569 */
 570static bool rootdir_empty(struct super_block *sb, unsigned long block)
 571{
 572	int offset = 0, files = 0, de_len;
 573	struct iso_directory_record *de;
 574	struct buffer_head *bh;
 575
 576	bh = sb_bread(sb, block);
 577	if (!bh)
 578		return true;
 579	while (files < 3) {
 580		de = (struct iso_directory_record *) (bh->b_data + offset);
 581		de_len = *(unsigned char *) de;
 582		if (de_len == 0)
 583			break;
 584		files++;
 585		offset += de_len;
 586	}
 587	brelse(bh);
 588	return files < 3;
 589}
 590
 591/*
 592 * Initialize the superblock and read the root inode.
 593 *
 594 * Note: a check_disk_change() has been done immediately prior
 595 * to this call, so we don't need to check again.
 596 */
 597static int isofs_fill_super(struct super_block *s, void *data, int silent)
 598{
 599	struct buffer_head *bh = NULL, *pri_bh = NULL;
 600	struct hs_primary_descriptor *h_pri = NULL;
 601	struct iso_primary_descriptor *pri = NULL;
 602	struct iso_supplementary_descriptor *sec = NULL;
 603	struct iso_directory_record *rootp;
 604	struct inode *inode;
 605	struct iso9660_options opt;
 606	struct isofs_sb_info *sbi;
 607	unsigned long first_data_zone;
 608	int joliet_level = 0;
 609	int iso_blknum, block;
 610	int orig_zonesize;
 611	int table, error = -EINVAL;
 612	unsigned int vol_desc_start;
 613
 614	save_mount_options(s, data);
 615
 616	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 617	if (!sbi)
 618		return -ENOMEM;
 619	s->s_fs_info = sbi;
 620
 621	if (!parse_options((char *)data, &opt))
 622		goto out_freesbi;
 623
 624	/*
 625	 * First of all, get the hardware blocksize for this device.
 626	 * If we don't know what it is, or the hardware blocksize is
 627	 * larger than the blocksize the user specified, then use
 628	 * that value.
 629	 */
 630	/*
 631	 * What if bugger tells us to go beyond page size?
 632	 */
 633	opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 634
 635	sbi->s_high_sierra = 0; /* default is iso9660 */
 636
 637	vol_desc_start = (opt.sbsector != -1) ?
 638		opt.sbsector : isofs_get_last_session(s,opt.session);
 639
 640	for (iso_blknum = vol_desc_start+16;
 641		iso_blknum < vol_desc_start+100; iso_blknum++) {
 642		struct hs_volume_descriptor *hdp;
 643		struct iso_volume_descriptor  *vdp;
 644
 645		block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 646		if (!(bh = sb_bread(s, block)))
 647			goto out_no_read;
 648
 649		vdp = (struct iso_volume_descriptor *)bh->b_data;
 650		hdp = (struct hs_volume_descriptor *)bh->b_data;
 651
 652		/*
 653		 * Due to the overlapping physical location of the descriptors,
 654		 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 655		 * proper identification in this case, we first check for ISO.
 656		 */
 657		if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 658			if (isonum_711(vdp->type) == ISO_VD_END)
 659				break;
 660			if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 661				if (pri == NULL) {
 662					pri = (struct iso_primary_descriptor *)vdp;
 663					/* Save the buffer in case we need it ... */
 664					pri_bh = bh;
 665					bh = NULL;
 666				}
 667			}
 668#ifdef CONFIG_JOLIET
 669			else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 670				sec = (struct iso_supplementary_descriptor *)vdp;
 671				if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 672					if (opt.joliet) {
 673						if (sec->escape[2] == 0x40)
 674							joliet_level = 1;
 675						else if (sec->escape[2] == 0x43)
 676							joliet_level = 2;
 677						else if (sec->escape[2] == 0x45)
 678							joliet_level = 3;
 679
 680						printk(KERN_DEBUG "ISO 9660 Extensions: "
 681							"Microsoft Joliet Level %d\n",
 682							joliet_level);
 683					}
 684					goto root_found;
 685				} else {
 686				/* Unknown supplementary volume descriptor */
 687				sec = NULL;
 688				}
 689			}
 690#endif
 691		} else {
 692			if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 693				if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 694					goto out_freebh;
 695
 696				sbi->s_high_sierra = 1;
 697				opt.rock = 0;
 698				h_pri = (struct hs_primary_descriptor *)vdp;
 699				goto root_found;
 700			}
 701		}
 702
 703		/* Just skip any volume descriptors we don't recognize */
 704
 705		brelse(bh);
 706		bh = NULL;
 707	}
 708	/*
 709	 * If we fall through, either no volume descriptor was found,
 710	 * or else we passed a primary descriptor looking for others.
 711	 */
 712	if (!pri)
 713		goto out_unknown_format;
 714	brelse(bh);
 715	bh = pri_bh;
 716	pri_bh = NULL;
 717
 718root_found:
 719
 720	if (joliet_level && (pri == NULL || !opt.rock)) {
 721		/* This is the case of Joliet with the norock mount flag.
 722		 * A disc with both Joliet and Rock Ridge is handled later
 723		 */
 724		pri = (struct iso_primary_descriptor *) sec;
 725	}
 726
 727	if(sbi->s_high_sierra){
 728		rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 729		sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 730		sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 731		sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 732	} else {
 733		if (!pri)
 734			goto out_freebh;
 735		rootp = (struct iso_directory_record *) pri->root_directory_record;
 736		sbi->s_nzones = isonum_733(pri->volume_space_size);
 737		sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 738		sbi->s_max_size = isonum_733(pri->volume_space_size);
 739	}
 740
 741	sbi->s_ninodes = 0; /* No way to figure this out easily */
 742
 743	orig_zonesize = sbi->s_log_zone_size;
 744	/*
 745	 * If the zone size is smaller than the hardware sector size,
 746	 * this is a fatal error.  This would occur if the disc drive
 747	 * had sectors that were 2048 bytes, but the filesystem had
 748	 * blocks that were 512 bytes (which should only very rarely
 749	 * happen.)
 750	 */
 751	if (orig_zonesize < opt.blocksize)
 752		goto out_bad_size;
 753
 754	/* RDE: convert log zone size to bit shift */
 755	switch (sbi->s_log_zone_size) {
 756	case  512: sbi->s_log_zone_size =  9; break;
 757	case 1024: sbi->s_log_zone_size = 10; break;
 758	case 2048: sbi->s_log_zone_size = 11; break;
 759
 760	default:
 761		goto out_bad_zone_size;
 762	}
 763
 764	s->s_magic = ISOFS_SUPER_MAGIC;
 765
 766	/*
 767	 * With multi-extent files, file size is only limited by the maximum
 768	 * size of a file system, which is 8 TB.
 769	 */
 770	s->s_maxbytes = 0x80000000000LL;
 771
 772	/*
 773	 * The CDROM is read-only, has no nodes (devices) on it, and since
 774	 * all of the files appear to be owned by root, we really do not want
 775	 * to allow suid.  (suid or devices will not show up unless we have
 776	 * Rock Ridge extensions)
 777	 */
 778
 779	s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 780
 781	/* Set this for reference. Its not currently used except on write
 782	   which we don't have .. */
 783
 784	first_data_zone = isonum_733(rootp->extent) +
 785			  isonum_711(rootp->ext_attr_length);
 786	sbi->s_firstdatazone = first_data_zone;
 787#ifndef BEQUIET
 788	printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 789		sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 790	printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 791	if(sbi->s_high_sierra)
 792		printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 793#endif
 794
 795	/*
 796	 * If the Joliet level is set, we _may_ decide to use the
 797	 * secondary descriptor, but can't be sure until after we
 798	 * read the root inode. But before reading the root inode
 799	 * we may need to change the device blocksize, and would
 800	 * rather release the old buffer first. So, we cache the
 801	 * first_data_zone value from the secondary descriptor.
 802	 */
 803	if (joliet_level) {
 804		pri = (struct iso_primary_descriptor *) sec;
 805		rootp = (struct iso_directory_record *)
 806			pri->root_directory_record;
 807		first_data_zone = isonum_733(rootp->extent) +
 808				isonum_711(rootp->ext_attr_length);
 809	}
 810
 811	/*
 812	 * We're all done using the volume descriptor, and may need
 813	 * to change the device blocksize, so release the buffer now.
 814	 */
 815	brelse(pri_bh);
 816	brelse(bh);
 817
 818	/*
 819	 * Force the blocksize to 512 for 512 byte sectors.  The file
 820	 * read primitives really get it wrong in a bad way if we don't
 821	 * do this.
 822	 *
 823	 * Note - we should never be setting the blocksize to something
 824	 * less than the hardware sector size for the device.  If we
 825	 * do, we would end up having to read larger buffers and split
 826	 * out portions to satisfy requests.
 827	 *
 828	 * Note2- the idea here is that we want to deal with the optimal
 829	 * zonesize in the filesystem.  If we have it set to something less,
 830	 * then we have horrible problems with trying to piece together
 831	 * bits of adjacent blocks in order to properly read directory
 832	 * entries.  By forcing the blocksize in this way, we ensure
 833	 * that we will never be required to do this.
 834	 */
 835	sb_set_blocksize(s, orig_zonesize);
 836
 837	sbi->s_nls_iocharset = NULL;
 838
 839#ifdef CONFIG_JOLIET
 840	if (joliet_level && opt.utf8 == 0) {
 841		char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 842		sbi->s_nls_iocharset = load_nls(p);
 843		if (! sbi->s_nls_iocharset) {
 844			/* Fail only if explicit charset specified */
 845			if (opt.iocharset)
 846				goto out_freesbi;
 847			sbi->s_nls_iocharset = load_nls_default();
 848		}
 849	}
 850#endif
 851	s->s_op = &isofs_sops;
 852	s->s_export_op = &isofs_export_ops;
 853	sbi->s_mapping = opt.map;
 854	sbi->s_rock = (opt.rock ? 2 : 0);
 855	sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 856	sbi->s_cruft = opt.cruft;
 857	sbi->s_hide = opt.hide;
 858	sbi->s_showassoc = opt.showassoc;
 859	sbi->s_uid = opt.uid;
 860	sbi->s_gid = opt.gid;
 861	sbi->s_uid_set = opt.uid_set;
 862	sbi->s_gid_set = opt.gid_set;
 863	sbi->s_utf8 = opt.utf8;
 864	sbi->s_nocompress = opt.nocompress;
 865	sbi->s_overriderockperm = opt.overriderockperm;
 866	/*
 867	 * It would be incredibly stupid to allow people to mark every file
 868	 * on the disk as suid, so we merely allow them to set the default
 869	 * permissions.
 870	 */
 871	if (opt.fmode != ISOFS_INVALID_MODE)
 872		sbi->s_fmode = opt.fmode & 0777;
 873	else
 874		sbi->s_fmode = ISOFS_INVALID_MODE;
 875	if (opt.dmode != ISOFS_INVALID_MODE)
 876		sbi->s_dmode = opt.dmode & 0777;
 877	else
 878		sbi->s_dmode = ISOFS_INVALID_MODE;
 879
 880	/*
 881	 * Read the root inode, which _may_ result in changing
 882	 * the s_rock flag. Once we have the final s_rock value,
 883	 * we then decide whether to use the Joliet descriptor.
 884	 */
 885	inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 886	if (IS_ERR(inode))
 887		goto out_no_root;
 888
 889	/*
 890	 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
 891	 * correct Joliet root directory.
 892	 */
 893	if (sbi->s_rock == 1 && joliet_level &&
 894				rootdir_empty(s, sbi->s_firstdatazone)) {
 895		printk(KERN_NOTICE
 896			"ISOFS: primary root directory is empty. "
 897			"Disabling Rock Ridge and switching to Joliet.");
 898		sbi->s_rock = 0;
 899	}
 900
 901	/*
 902	 * If this disk has both Rock Ridge and Joliet on it, then we
 903	 * want to use Rock Ridge by default.  This can be overridden
 904	 * by using the norock mount option.  There is still one other
 905	 * possibility that is not taken into account: a Rock Ridge
 906	 * CD with Unicode names.  Until someone sees such a beast, it
 907	 * will not be supported.
 908	 */
 909	if (sbi->s_rock == 1) {
 910		joliet_level = 0;
 911	} else if (joliet_level) {
 912		sbi->s_rock = 0;
 913		if (sbi->s_firstdatazone != first_data_zone) {
 914			sbi->s_firstdatazone = first_data_zone;
 915			printk(KERN_DEBUG
 916				"ISOFS: changing to secondary root\n");
 917			iput(inode);
 918			inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 919			if (IS_ERR(inode))
 920				goto out_no_root;
 921		}
 922	}
 923
 924	if (opt.check == 'u') {
 925		/* Only Joliet is case insensitive by default */
 926		if (joliet_level)
 927			opt.check = 'r';
 928		else
 929			opt.check = 's';
 930	}
 931	sbi->s_joliet_level = joliet_level;
 932
 933	/* Make sure the root inode is a directory */
 934	if (!S_ISDIR(inode->i_mode)) {
 935		printk(KERN_WARNING
 936			"isofs_fill_super: root inode is not a directory. "
 937			"Corrupted media?\n");
 938		goto out_iput;
 939	}
 940
 941	table = 0;
 942	if (joliet_level)
 943		table += 2;
 944	if (opt.check == 'r')
 945		table++;
 946
 947	s->s_d_op = &isofs_dentry_ops[table];
 948
 949	/* get the root dentry */
 950	s->s_root = d_make_root(inode);
 951	if (!(s->s_root)) {
 952		error = -ENOMEM;
 953		goto out_no_inode;
 954	}
 955
 956	kfree(opt.iocharset);
 957
 958	return 0;
 959
 960	/*
 961	 * Display error messages and free resources.
 962	 */
 963out_iput:
 964	iput(inode);
 965	goto out_no_inode;
 966out_no_root:
 967	error = PTR_ERR(inode);
 968	if (error != -ENOMEM)
 969		printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 970out_no_inode:
 971#ifdef CONFIG_JOLIET
 972	unload_nls(sbi->s_nls_iocharset);
 973#endif
 974	goto out_freesbi;
 975out_no_read:
 976	printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 977		__func__, s->s_id, iso_blknum, block);
 978	goto out_freebh;
 979out_bad_zone_size:
 980	printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 981		sbi->s_log_zone_size);
 982	goto out_freebh;
 983out_bad_size:
 984	printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 985		orig_zonesize, opt.blocksize);
 986	goto out_freebh;
 987out_unknown_format:
 988	if (!silent)
 989		printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 990
 991out_freebh:
 992	brelse(bh);
 993	brelse(pri_bh);
 994out_freesbi:
 995	kfree(opt.iocharset);
 996	kfree(sbi);
 997	s->s_fs_info = NULL;
 998	return error;
 999}
1000
1001static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1002{
1003	struct super_block *sb = dentry->d_sb;
1004	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1005
1006	buf->f_type = ISOFS_SUPER_MAGIC;
1007	buf->f_bsize = sb->s_blocksize;
1008	buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1009		<< (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1010	buf->f_bfree = 0;
1011	buf->f_bavail = 0;
1012	buf->f_files = ISOFS_SB(sb)->s_ninodes;
1013	buf->f_ffree = 0;
1014	buf->f_fsid.val[0] = (u32)id;
1015	buf->f_fsid.val[1] = (u32)(id >> 32);
1016	buf->f_namelen = NAME_MAX;
1017	return 0;
1018}
1019
1020/*
1021 * Get a set of blocks; filling in buffer_heads if already allocated
1022 * or getblk() if they are not.  Returns the number of blocks inserted
1023 * (-ve == error.)
1024 */
1025int isofs_get_blocks(struct inode *inode, sector_t iblock,
1026		     struct buffer_head **bh, unsigned long nblocks)
1027{
1028	unsigned long b_off = iblock;
1029	unsigned offset, sect_size;
1030	unsigned int firstext;
1031	unsigned long nextblk, nextoff;
1032	int section, rv, error;
1033	struct iso_inode_info *ei = ISOFS_I(inode);
1034
1035	error = -EIO;
1036	rv = 0;
1037	if (iblock != b_off) {
1038		printk(KERN_DEBUG "%s: block number too large\n", __func__);
1039		goto abort;
1040	}
1041
1042
1043	offset = 0;
1044	firstext = ei->i_first_extent;
1045	sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1046	nextblk = ei->i_next_section_block;
1047	nextoff = ei->i_next_section_offset;
1048	section = 0;
1049
1050	while (nblocks) {
1051		/* If we are *way* beyond the end of the file, print a message.
1052		 * Access beyond the end of the file up to the next page boundary
1053		 * is normal, however because of the way the page cache works.
1054		 * In this case, we just return 0 so that we can properly fill
1055		 * the page with useless information without generating any
1056		 * I/O errors.
1057		 */
1058		if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1059			printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1060				__func__, b_off,
1061				(unsigned long long)inode->i_size);
1062			goto abort;
1063		}
1064
1065		/* On the last section, nextblk == 0, section size is likely to
1066		 * exceed sect_size by a partial block, and access beyond the
1067		 * end of the file will reach beyond the section size, too.
1068		 */
1069		while (nextblk && (b_off >= (offset + sect_size))) {
1070			struct inode *ninode;
1071
1072			offset += sect_size;
1073			ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1074			if (IS_ERR(ninode)) {
1075				error = PTR_ERR(ninode);
1076				goto abort;
1077			}
1078			firstext  = ISOFS_I(ninode)->i_first_extent;
1079			sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1080			nextblk   = ISOFS_I(ninode)->i_next_section_block;
1081			nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1082			iput(ninode);
1083
1084			if (++section > 100) {
1085				printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1086					" aborting...\n", __func__);
1087				printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1088					"nextblk=%lu nextoff=%lu\n", __func__,
1089					b_off, firstext, (unsigned) sect_size,
1090					nextblk, nextoff);
1091				goto abort;
1092			}
1093		}
1094
1095		if (*bh) {
1096			map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1097		} else {
1098			*bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1099			if (!*bh)
1100				goto abort;
1101		}
1102		bh++;	/* Next buffer head */
1103		b_off++;	/* Next buffer offset */
1104		nblocks--;
1105		rv++;
1106	}
1107
1108	error = 0;
1109abort:
1110	return rv != 0 ? rv : error;
1111}
1112
1113/*
1114 * Used by the standard interfaces.
1115 */
1116static int isofs_get_block(struct inode *inode, sector_t iblock,
1117		    struct buffer_head *bh_result, int create)
1118{
1119	int ret;
1120
1121	if (create) {
1122		printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1123		return -EROFS;
1124	}
1125
1126	ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1127	return ret < 0 ? ret : 0;
1128}
1129
1130static int isofs_bmap(struct inode *inode, sector_t block)
1131{
1132	struct buffer_head dummy;
1133	int error;
1134
1135	dummy.b_state = 0;
1136	dummy.b_blocknr = -1000;
1137	error = isofs_get_block(inode, block, &dummy, 0);
1138	if (!error)
1139		return dummy.b_blocknr;
1140	return 0;
1141}
1142
1143struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1144{
1145	sector_t blknr = isofs_bmap(inode, block);
1146	if (!blknr)
1147		return NULL;
1148	return sb_bread(inode->i_sb, blknr);
1149}
1150
1151static int isofs_readpage(struct file *file, struct page *page)
1152{
1153	return mpage_readpage(page, isofs_get_block);
1154}
1155
1156static int isofs_readpages(struct file *file, struct address_space *mapping,
1157			struct list_head *pages, unsigned nr_pages)
1158{
1159	return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1160}
1161
1162static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1163{
1164	return generic_block_bmap(mapping,block,isofs_get_block);
1165}
1166
1167static const struct address_space_operations isofs_aops = {
1168	.readpage = isofs_readpage,
1169	.readpages = isofs_readpages,
1170	.bmap = _isofs_bmap
1171};
1172
1173static int isofs_read_level3_size(struct inode *inode)
1174{
1175	unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1176	int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1177	struct buffer_head *bh = NULL;
1178	unsigned long block, offset, block_saved, offset_saved;
1179	int i = 0;
1180	int more_entries = 0;
1181	struct iso_directory_record *tmpde = NULL;
1182	struct iso_inode_info *ei = ISOFS_I(inode);
1183
1184	inode->i_size = 0;
1185
1186	/* The first 16 blocks are reserved as the System Area.  Thus,
1187	 * no inodes can appear in block 0.  We use this to flag that
1188	 * this is the last section. */
1189	ei->i_next_section_block = 0;
1190	ei->i_next_section_offset = 0;
1191
1192	block = ei->i_iget5_block;
1193	offset = ei->i_iget5_offset;
1194
1195	do {
1196		struct iso_directory_record *de;
1197		unsigned int de_len;
1198
1199		if (!bh) {
1200			bh = sb_bread(inode->i_sb, block);
1201			if (!bh)
1202				goto out_noread;
1203		}
1204		de = (struct iso_directory_record *) (bh->b_data + offset);
1205		de_len = *(unsigned char *) de;
1206
1207		if (de_len == 0) {
1208			brelse(bh);
1209			bh = NULL;
1210			++block;
1211			offset = 0;
1212			continue;
1213		}
1214
1215		block_saved = block;
1216		offset_saved = offset;
1217		offset += de_len;
1218
1219		/* Make sure we have a full directory entry */
1220		if (offset >= bufsize) {
1221			int slop = bufsize - offset + de_len;
1222			if (!tmpde) {
1223				tmpde = kmalloc(256, GFP_KERNEL);
1224				if (!tmpde)
1225					goto out_nomem;
1226			}
1227			memcpy(tmpde, de, slop);
1228			offset &= bufsize - 1;
1229			block++;
1230			brelse(bh);
1231			bh = NULL;
1232			if (offset) {
1233				bh = sb_bread(inode->i_sb, block);
1234				if (!bh)
1235					goto out_noread;
1236				memcpy((void *)tmpde+slop, bh->b_data, offset);
1237			}
1238			de = tmpde;
1239		}
1240
1241		inode->i_size += isonum_733(de->size);
1242		if (i == 1) {
1243			ei->i_next_section_block = block_saved;
1244			ei->i_next_section_offset = offset_saved;
1245		}
1246
1247		more_entries = de->flags[-high_sierra] & 0x80;
1248
1249		i++;
1250		if (i > 100)
1251			goto out_toomany;
1252	} while (more_entries);
1253out:
1254	kfree(tmpde);
1255	if (bh)
1256		brelse(bh);
1257	return 0;
1258
1259out_nomem:
1260	if (bh)
1261		brelse(bh);
1262	return -ENOMEM;
1263
1264out_noread:
1265	printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1266	kfree(tmpde);
1267	return -EIO;
1268
1269out_toomany:
1270	printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1271		"isofs_read_level3_size: inode=%lu\n",
1272		__func__, inode->i_ino);
1273	goto out;
1274}
1275
1276static int isofs_read_inode(struct inode *inode)
1277{
1278	struct super_block *sb = inode->i_sb;
1279	struct isofs_sb_info *sbi = ISOFS_SB(sb);
1280	unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1281	unsigned long block;
1282	int high_sierra = sbi->s_high_sierra;
1283	struct buffer_head *bh = NULL;
1284	struct iso_directory_record *de;
1285	struct iso_directory_record *tmpde = NULL;
1286	unsigned int de_len;
1287	unsigned long offset;
1288	struct iso_inode_info *ei = ISOFS_I(inode);
1289	int ret = -EIO;
1290
1291	block = ei->i_iget5_block;
1292	bh = sb_bread(inode->i_sb, block);
1293	if (!bh)
1294		goto out_badread;
1295
1296	offset = ei->i_iget5_offset;
1297
1298	de = (struct iso_directory_record *) (bh->b_data + offset);
1299	de_len = *(unsigned char *) de;
1300
1301	if (offset + de_len > bufsize) {
1302		int frag1 = bufsize - offset;
1303
1304		tmpde = kmalloc(de_len, GFP_KERNEL);
1305		if (tmpde == NULL) {
1306			printk(KERN_INFO "%s: out of memory\n", __func__);
1307			ret = -ENOMEM;
1308			goto fail;
1309		}
1310		memcpy(tmpde, bh->b_data + offset, frag1);
1311		brelse(bh);
1312		bh = sb_bread(inode->i_sb, ++block);
1313		if (!bh)
1314			goto out_badread;
1315		memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1316		de = tmpde;
1317	}
1318
1319	inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1320					ei->i_iget5_offset,
1321					ISOFS_BUFFER_BITS(inode));
1322
1323	/* Assume it is a normal-format file unless told otherwise */
1324	ei->i_file_format = isofs_file_normal;
1325
1326	if (de->flags[-high_sierra] & 2) {
1327		if (sbi->s_dmode != ISOFS_INVALID_MODE)
1328			inode->i_mode = S_IFDIR | sbi->s_dmode;
1329		else
1330			inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1331		set_nlink(inode, 1);	/*
1332					 * Set to 1.  We know there are 2, but
1333					 * the find utility tries to optimize
1334					 * if it is 2, and it screws up.  It is
1335					 * easier to give 1 which tells find to
1336					 * do it the hard way.
1337					 */
1338	} else {
1339		if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1340			inode->i_mode = S_IFREG | sbi->s_fmode;
1341		} else {
1342			/*
1343			 * Set default permissions: r-x for all.  The disc
1344			 * could be shared with DOS machines so virtually
1345			 * anything could be a valid executable.
1346			 */
1347			inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1348		}
1349		set_nlink(inode, 1);
1350	}
1351	inode->i_uid = sbi->s_uid;
1352	inode->i_gid = sbi->s_gid;
1353	inode->i_blocks = 0;
1354
1355	ei->i_format_parm[0] = 0;
1356	ei->i_format_parm[1] = 0;
1357	ei->i_format_parm[2] = 0;
1358
1359	ei->i_section_size = isonum_733(de->size);
1360	if (de->flags[-high_sierra] & 0x80) {
1361		ret = isofs_read_level3_size(inode);
1362		if (ret < 0)
1363			goto fail;
1364		ret = -EIO;
1365	} else {
1366		ei->i_next_section_block = 0;
1367		ei->i_next_section_offset = 0;
1368		inode->i_size = isonum_733(de->size);
1369	}
1370
1371	/*
1372	 * Some dipshit decided to store some other bit of information
1373	 * in the high byte of the file length.  Truncate size in case
1374	 * this CDROM was mounted with the cruft option.
1375	 */
1376
1377	if (sbi->s_cruft)
1378		inode->i_size &= 0x00ffffff;
1379
1380	if (de->interleave[0]) {
1381		printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1382		inode->i_size = 0;
1383	}
1384
1385	/* I have no idea what file_unit_size is used for, so
1386	   we will flag it for now */
1387	if (de->file_unit_size[0] != 0) {
1388		printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1389			inode->i_ino);
1390	}
1391
1392	/* I have no idea what other flag bits are used for, so
1393	   we will flag it for now */
1394#ifdef DEBUG
1395	if((de->flags[-high_sierra] & ~2)!= 0){
1396		printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1397				"(%ld %x).\n",
1398			inode->i_ino, de->flags[-high_sierra]);
1399	}
1400#endif
1401
1402	inode->i_mtime.tv_sec =
1403	inode->i_atime.tv_sec =
1404	inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1405	inode->i_mtime.tv_nsec =
1406	inode->i_atime.tv_nsec =
1407	inode->i_ctime.tv_nsec = 0;
1408
1409	ei->i_first_extent = (isonum_733(de->extent) +
1410			isonum_711(de->ext_attr_length));
1411
1412	/* Set the number of blocks for stat() - should be done before RR */
1413	inode->i_blocks = (inode->i_size + 511) >> 9;
1414
1415	/*
1416	 * Now test for possible Rock Ridge extensions which will override
1417	 * some of these numbers in the inode structure.
1418	 */
1419
1420	if (!high_sierra) {
1421		parse_rock_ridge_inode(de, inode);
1422		/* if we want uid/gid set, override the rock ridge setting */
1423		if (sbi->s_uid_set)
1424			inode->i_uid = sbi->s_uid;
1425		if (sbi->s_gid_set)
1426			inode->i_gid = sbi->s_gid;
1427	}
1428	/* Now set final access rights if overriding rock ridge setting */
1429	if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1430	    sbi->s_dmode != ISOFS_INVALID_MODE)
1431		inode->i_mode = S_IFDIR | sbi->s_dmode;
1432	if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1433	    sbi->s_fmode != ISOFS_INVALID_MODE)
1434		inode->i_mode = S_IFREG | sbi->s_fmode;
1435
1436	/* Install the inode operations vector */
1437	if (S_ISREG(inode->i_mode)) {
1438		inode->i_fop = &generic_ro_fops;
1439		switch (ei->i_file_format) {
1440#ifdef CONFIG_ZISOFS
1441		case isofs_file_compressed:
1442			inode->i_data.a_ops = &zisofs_aops;
1443			break;
1444#endif
1445		default:
1446			inode->i_data.a_ops = &isofs_aops;
1447			break;
1448		}
1449	} else if (S_ISDIR(inode->i_mode)) {
1450		inode->i_op = &isofs_dir_inode_operations;
1451		inode->i_fop = &isofs_dir_operations;
1452	} else if (S_ISLNK(inode->i_mode)) {
1453		inode->i_op = &page_symlink_inode_operations;
1454		inode->i_data.a_ops = &isofs_symlink_aops;
1455	} else
1456		/* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1457		init_special_inode(inode, inode->i_mode, inode->i_rdev);
1458
1459	ret = 0;
1460out:
1461	kfree(tmpde);
1462	if (bh)
1463		brelse(bh);
1464	return ret;
1465
1466out_badread:
1467	printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1468fail:
1469	goto out;
1470}
1471
1472struct isofs_iget5_callback_data {
1473	unsigned long block;
1474	unsigned long offset;
1475};
1476
1477static int isofs_iget5_test(struct inode *ino, void *data)
1478{
1479	struct iso_inode_info *i = ISOFS_I(ino);
1480	struct isofs_iget5_callback_data *d =
1481		(struct isofs_iget5_callback_data*)data;
1482	return (i->i_iget5_block == d->block)
1483		&& (i->i_iget5_offset == d->offset);
1484}
1485
1486static int isofs_iget5_set(struct inode *ino, void *data)
1487{
1488	struct iso_inode_info *i = ISOFS_I(ino);
1489	struct isofs_iget5_callback_data *d =
1490		(struct isofs_iget5_callback_data*)data;
1491	i->i_iget5_block = d->block;
1492	i->i_iget5_offset = d->offset;
1493	return 0;
1494}
1495
1496/* Store, in the inode's containing structure, the block and block
1497 * offset that point to the underlying meta-data for the inode.  The
1498 * code below is otherwise similar to the iget() code in
1499 * include/linux/fs.h */
1500struct inode *isofs_iget(struct super_block *sb,
1501			 unsigned long block,
1502			 unsigned long offset)
1503{
1504	unsigned long hashval;
1505	struct inode *inode;
1506	struct isofs_iget5_callback_data data;
1507	long ret;
1508
1509	if (offset >= 1ul << sb->s_blocksize_bits)
1510		return ERR_PTR(-EINVAL);
1511
1512	data.block = block;
1513	data.offset = offset;
1514
1515	hashval = (block << sb->s_blocksize_bits) | offset;
1516
1517	inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1518				&isofs_iget5_set, &data);
1519
1520	if (!inode)
1521		return ERR_PTR(-ENOMEM);
1522
1523	if (inode->i_state & I_NEW) {
1524		ret = isofs_read_inode(inode);
1525		if (ret < 0) {
1526			iget_failed(inode);
1527			inode = ERR_PTR(ret);
1528		} else {
1529			unlock_new_inode(inode);
1530		}
1531	}
1532
1533	return inode;
1534}
1535
1536static struct dentry *isofs_mount(struct file_system_type *fs_type,
1537	int flags, const char *dev_name, void *data)
1538{
1539	return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1540}
1541
1542static struct file_system_type iso9660_fs_type = {
1543	.owner		= THIS_MODULE,
1544	.name		= "iso9660",
1545	.mount		= isofs_mount,
1546	.kill_sb	= kill_block_super,
1547	.fs_flags	= FS_REQUIRES_DEV,
1548};
1549
1550static int __init init_iso9660_fs(void)
1551{
1552	int err = init_inodecache();
1553	if (err)
1554		goto out;
1555#ifdef CONFIG_ZISOFS
1556	err = zisofs_init();
1557	if (err)
1558		goto out1;
1559#endif
1560	err = register_filesystem(&iso9660_fs_type);
1561	if (err)
1562		goto out2;
1563	return 0;
1564out2:
1565#ifdef CONFIG_ZISOFS
1566	zisofs_cleanup();
1567out1:
1568#endif
1569	destroy_inodecache();
1570out:
1571	return err;
1572}
1573
1574static void __exit exit_iso9660_fs(void)
1575{
1576        unregister_filesystem(&iso9660_fs_type);
1577#ifdef CONFIG_ZISOFS
1578	zisofs_cleanup();
1579#endif
1580	destroy_inodecache();
1581}
1582
1583module_init(init_iso9660_fs)
1584module_exit(exit_iso9660_fs)
1585MODULE_LICENSE("GPL");
1586/* Actual filesystem name is iso9660, as requested in filesystems.c */
1587MODULE_ALIAS("iso9660");