inode.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/fs/isofs/inode.c
   4 *
   5 *  (C) 1991  Linus Torvalds - minix filesystem
   6 *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
   7 *      1994  Eberhard Mönkeberg - multi session handling.
   8 *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
   9 *	1997  Gordon Chaffee - Joliet CDs
  10 *	1998  Eric Lammerts - ISO 9660 Level 3
  11 *	2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
  12 *	2004  Paul Serice - NFS Export Operations
  13 */
  14
  15#include <linux/init.h>
  16#include <linux/module.h>
  17
  18#include <linux/slab.h>
  19#include <linux/cred.h>
  20#include <linux/nls.h>
  21#include <linux/ctype.h>
  22#include <linux/statfs.h>
  23#include <linux/cdrom.h>
  24#include <linux/mpage.h>
  25#include <linux/user_namespace.h>
  26#include <linux/seq_file.h>
  27#include <linux/blkdev.h>
  28#include <linux/fs_context.h>
  29#include <linux/fs_parser.h>
  30
  31#include "isofs.h"
  32#include "zisofs.h"
  33
  34/* max tz offset is 13 hours */
  35#define MAX_TZ_OFFSET (52*15*60)
  36
  37#define BEQUIET
  38
  39static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
  40static int isofs_dentry_cmpi(const struct dentry *dentry,
  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, struct qstr *qstr);
  45static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
  46static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
  47		unsigned int len, const char *str, const struct qstr *name);
  48static int isofs_dentry_cmp_ms(const struct dentry *dentry,
  49		unsigned int len, const char *str, const struct qstr *name);
  50#endif
  51
  52static void isofs_put_super(struct super_block *sb)
  53{
  54	struct isofs_sb_info *sbi = ISOFS_SB(sb);
  55
  56#ifdef CONFIG_JOLIET
  57	unload_nls(sbi->s_nls_iocharset);
  58#endif
  59
  60	kfree(sbi);
  61	sb->s_fs_info = NULL;
  62	return;
  63}
  64
  65static int isofs_read_inode(struct inode *, int relocated);
  66static int isofs_statfs (struct dentry *, struct kstatfs *);
  67static int isofs_show_options(struct seq_file *, struct dentry *);
  68
  69static struct kmem_cache *isofs_inode_cachep;
  70
  71static struct inode *isofs_alloc_inode(struct super_block *sb)
  72{
  73	struct iso_inode_info *ei;
  74	ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
  75	if (!ei)
  76		return NULL;
  77	return &ei->vfs_inode;
  78}
  79
  80static void isofs_free_inode(struct inode *inode)
  81{
  82	kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  83}
  84
  85static void init_once(void *foo)
  86{
  87	struct iso_inode_info *ei = foo;
  88
  89	inode_init_once(&ei->vfs_inode);
  90}
  91
  92static int __init init_inodecache(void)
  93{
  94	isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  95					sizeof(struct iso_inode_info),
  96					0, (SLAB_RECLAIM_ACCOUNT|
  97					SLAB_ACCOUNT),
  98					init_once);
  99	if (!isofs_inode_cachep)
 100		return -ENOMEM;
 101	return 0;
 102}
 103
 104static void destroy_inodecache(void)
 105{
 106	/*
 107	 * Make sure all delayed rcu free inodes are flushed before we
 108	 * destroy cache.
 109	 */
 110	rcu_barrier();
 111	kmem_cache_destroy(isofs_inode_cachep);
 112}
 113
 114static int isofs_reconfigure(struct fs_context *fc)
 115{
 116	sync_filesystem(fc->root->d_sb);
 117	if (!(fc->sb_flags & SB_RDONLY))
 118		return -EROFS;
 119	return 0;
 120}
 121
 122static const struct super_operations isofs_sops = {
 123	.alloc_inode	= isofs_alloc_inode,
 124	.free_inode	= isofs_free_inode,
 125	.put_super	= isofs_put_super,
 126	.statfs		= isofs_statfs,
 127	.show_options	= isofs_show_options,
 128};
 129
 130
 131static const struct dentry_operations isofs_dentry_ops[] = {
 132	{
 133		.d_hash		= isofs_hashi,
 134		.d_compare	= isofs_dentry_cmpi,
 135	},
 136#ifdef CONFIG_JOLIET
 137	{
 138		.d_hash		= isofs_hash_ms,
 139		.d_compare	= isofs_dentry_cmp_ms,
 140	},
 141	{
 142		.d_hash		= isofs_hashi_ms,
 143		.d_compare	= isofs_dentry_cmpi_ms,
 144	},
 145#endif
 146};
 147
 148struct isofs_options{
 149	unsigned int rock:1;
 150	unsigned int joliet:1;
 151	unsigned int cruft:1;
 152	unsigned int hide:1;
 153	unsigned int showassoc:1;
 154	unsigned int nocompress:1;
 155	unsigned int overriderockperm:1;
 156	unsigned int uid_set:1;
 157	unsigned int gid_set:1;
 158	unsigned char map;
 159	unsigned char check;
 160	unsigned int blocksize;
 161	umode_t fmode;
 162	umode_t dmode;
 163	kgid_t gid;
 164	kuid_t uid;
 165	char *iocharset;
 166	/* LVE */
 167	s32 session;
 168	s32 sbsector;
 169};
 170
 171/*
 172 * Compute the hash for the isofs name corresponding to the dentry.
 173 */
 174static int
 175isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 176{
 177	const char *name;
 178	int len;
 179	char c;
 180	unsigned long hash;
 181
 182	len = qstr->len;
 183	name = qstr->name;
 184	if (ms) {
 185		while (len && name[len-1] == '.')
 186			len--;
 187	}
 188
 189	hash = init_name_hash(dentry);
 190	while (len--) {
 191		c = tolower(*name++);
 192		hash = partial_name_hash(c, hash);
 193	}
 194	qstr->hash = end_name_hash(hash);
 195
 196	return 0;
 197}
 198
 199/*
 200 * Compare of two isofs names.
 201 */
 202static int isofs_dentry_cmp_common(
 203		unsigned int len, const char *str,
 204		const struct qstr *name, int ms, int ci)
 205{
 206	int alen, blen;
 207
 208	/* A filename cannot end in '.' or we treat it like it has none */
 209	alen = name->len;
 210	blen = len;
 211	if (ms) {
 212		while (alen && name->name[alen-1] == '.')
 213			alen--;
 214		while (blen && str[blen-1] == '.')
 215			blen--;
 216	}
 217	if (alen == blen) {
 218		if (ci) {
 219			if (strncasecmp(name->name, str, alen) == 0)
 220				return 0;
 221		} else {
 222			if (strncmp(name->name, str, alen) == 0)
 223				return 0;
 224		}
 225	}
 226	return 1;
 227}
 228
 229static int
 230isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
 231{
 232	return isofs_hashi_common(dentry, qstr, 0);
 233}
 234
 235static int
 236isofs_dentry_cmpi(const struct dentry *dentry,
 237		unsigned int len, const char *str, const struct qstr *name)
 238{
 239	return isofs_dentry_cmp_common(len, str, name, 0, 1);
 240}
 241
 242#ifdef CONFIG_JOLIET
 243/*
 244 * Compute the hash for the isofs name corresponding to the dentry.
 245 */
 246static int
 247isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 248{
 249	const char *name;
 250	int len;
 251
 252	len = qstr->len;
 253	name = qstr->name;
 254	if (ms) {
 255		while (len && name[len-1] == '.')
 256			len--;
 257	}
 258
 259	qstr->hash = full_name_hash(dentry, name, len);
 260
 261	return 0;
 262}
 263
 264static int
 265isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
 266{
 267	return isofs_hash_common(dentry, qstr, 1);
 268}
 269
 270static int
 271isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
 272{
 273	return isofs_hashi_common(dentry, qstr, 1);
 274}
 275
 276static int
 277isofs_dentry_cmp_ms(const struct dentry *dentry,
 278		unsigned int len, const char *str, const struct qstr *name)
 279{
 280	return isofs_dentry_cmp_common(len, str, name, 1, 0);
 281}
 282
 283static int
 284isofs_dentry_cmpi_ms(const struct dentry *dentry,
 285		unsigned int len, const char *str, const struct qstr *name)
 286{
 287	return isofs_dentry_cmp_common(len, str, name, 1, 1);
 288}
 289#endif
 290
 291enum {
 292	Opt_block, Opt_check, Opt_cruft, Opt_gid, Opt_ignore, Opt_iocharset,
 293	Opt_map, Opt_mode, Opt_nojoliet, Opt_norock, Opt_sb, Opt_session,
 294	Opt_uid, Opt_unhide, Opt_utf8, Opt_err, Opt_nocompress, Opt_hide,
 295	Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 296};
 297
 298static const struct constant_table isofs_param_map[] = {
 299	{"acorn",	'a'},
 300	{"a",		'a'},
 301	{"normal",	'n'},
 302	{"n",		'n'},
 303	{"off",		'o'},
 304	{"o",		'o'},
 305	{}
 306};
 307
 308static const struct constant_table isofs_param_check[] = {
 309	{"relaxed",	'r'},
 310	{"r",		'r'},
 311	{"strict",	's'},
 312	{"s",		's'},
 313	{}
 314};
 315
 316static const struct fs_parameter_spec isofs_param_spec[] = {
 317	fsparam_flag	("norock",		Opt_norock),
 318	fsparam_flag	("nojoliet",		Opt_nojoliet),
 319	fsparam_flag	("unhide",		Opt_unhide),
 320	fsparam_flag	("hide",		Opt_hide),
 321	fsparam_flag	("showassoc",		Opt_showassoc),
 322	fsparam_flag	("cruft",		Opt_cruft),
 323	fsparam_flag	("utf8",		Opt_utf8),
 324	fsparam_string	("iocharset",		Opt_iocharset),
 325	fsparam_enum	("map",			Opt_map, isofs_param_map),
 326	fsparam_u32	("session",		Opt_session),
 327	fsparam_u32	("sbsector",		Opt_sb),
 328	fsparam_enum	("check",		Opt_check, isofs_param_check),
 329	fsparam_uid	("uid",			Opt_uid),
 330	fsparam_gid	("gid",			Opt_gid),
 331	/* Note: mode/dmode historically accepted %u not strictly %o */
 332	fsparam_u32	("mode",		Opt_mode),
 333	fsparam_u32	("dmode",		Opt_dmode),
 334	fsparam_flag	("overriderockperm",	Opt_overriderockperm),
 335	fsparam_u32	("block",		Opt_block),
 336	fsparam_string	("conv",		Opt_ignore),
 337	fsparam_flag	("nocompress",		Opt_nocompress),
 338	{}
 339};
 340
 341static int isofs_parse_param(struct fs_context *fc,
 342			       struct fs_parameter *param)
 343{
 344	struct isofs_options *popt = fc->fs_private;
 345	struct fs_parse_result result;
 346	int opt;
 347	unsigned int n;
 348
 349	/* There are no remountable options */
 350	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
 351		return 0;
 352
 353	opt = fs_parse(fc, isofs_param_spec, param, &result);
 354	if (opt < 0)
 355		return opt;
 356
 357	switch (opt) {
 358	case Opt_norock:
 359		popt->rock = 0;
 360		break;
 361	case Opt_nojoliet:
 362		popt->joliet = 0;
 363		break;
 364	case Opt_hide:
 365		popt->hide = 1;
 366		break;
 367	case Opt_unhide:
 368	case Opt_showassoc:
 369		popt->showassoc = 1;
 370		break;
 371	case Opt_cruft:
 372		popt->cruft = 1;
 373		break;
 374#ifdef CONFIG_JOLIET
 375	case Opt_utf8:
 376		kfree(popt->iocharset);
 377		popt->iocharset = kstrdup("utf8", GFP_KERNEL);
 378		if (!popt->iocharset)
 379			return -ENOMEM;
 380		break;
 381	case Opt_iocharset:
 382		kfree(popt->iocharset);
 383		popt->iocharset = kstrdup(param->string, GFP_KERNEL);
 384		if (!popt->iocharset)
 385			return -ENOMEM;
 386		break;
 387#endif
 388	case Opt_map:
 389		popt->map = result.uint_32;
 390		break;
 391	case Opt_session:
 392		n = result.uint_32;
 393		/*
 394		 * Track numbers are supposed to be in range 1-99, the
 395		 * mount option starts indexing at 0.
 396		 */
 397		if (n >= 99)
 398			return -EINVAL;
 399		popt->session = n + 1;
 400		break;
 401	case Opt_sb:
 402		popt->sbsector = result.uint_32;
 403		break;
 404	case Opt_check:
 405		popt->check = result.uint_32;
 406		break;
 407	case Opt_ignore:
 408		break;
 409	case Opt_uid:
 410		popt->uid = result.uid;
 411		popt->uid_set = 1;
 412		break;
 413	case Opt_gid:
 414		popt->gid = result.gid;
 415		popt->gid_set = 1;
 416		break;
 417	case Opt_mode:
 418		popt->fmode = result.uint_32;
 419		break;
 420	case Opt_dmode:
 421		popt->dmode = result.uint_32;
 422		break;
 423	case Opt_overriderockperm:
 424		popt->overriderockperm = 1;
 425		break;
 426	case Opt_block:
 427		n = result.uint_32;
 428		if (n != 512 && n != 1024 && n != 2048)
 429			return -EINVAL;
 430		popt->blocksize = n;
 431		break;
 432	case Opt_nocompress:
 433		popt->nocompress = 1;
 434		break;
 435	default:
 436		return -EINVAL;
 437	}
 438	return 0;
 439}
 440
 441/*
 442 * Display the mount options in /proc/mounts.
 443 */
 444static int isofs_show_options(struct seq_file *m, struct dentry *root)
 445{
 446	struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
 447
 448	if (!sbi->s_rock)		seq_puts(m, ",norock");
 449	else if (!sbi->s_joliet_level)	seq_puts(m, ",nojoliet");
 450	if (sbi->s_cruft)		seq_puts(m, ",cruft");
 451	if (sbi->s_hide)		seq_puts(m, ",hide");
 452	if (sbi->s_nocompress)		seq_puts(m, ",nocompress");
 453	if (sbi->s_overriderockperm)	seq_puts(m, ",overriderockperm");
 454	if (sbi->s_showassoc)		seq_puts(m, ",showassoc");
 455
 456	if (sbi->s_check)		seq_printf(m, ",check=%c", sbi->s_check);
 457	if (sbi->s_mapping)		seq_printf(m, ",map=%c", sbi->s_mapping);
 458	if (sbi->s_session != 255)	seq_printf(m, ",session=%u", sbi->s_session - 1);
 459	if (sbi->s_sbsector != -1)	seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
 460
 461	if (root->d_sb->s_blocksize != 1024)
 462		seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
 463
 464	if (sbi->s_uid_set)
 465		seq_printf(m, ",uid=%u",
 466			   from_kuid_munged(&init_user_ns, sbi->s_uid));
 467	if (sbi->s_gid_set)
 468		seq_printf(m, ",gid=%u",
 469			   from_kgid_munged(&init_user_ns, sbi->s_gid));
 470
 471	if (sbi->s_dmode != ISOFS_INVALID_MODE)
 472		seq_printf(m, ",dmode=%o", sbi->s_dmode);
 473	if (sbi->s_fmode != ISOFS_INVALID_MODE)
 474		seq_printf(m, ",fmode=%o", sbi->s_fmode);
 475
 476#ifdef CONFIG_JOLIET
 477	if (sbi->s_nls_iocharset)
 478		seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
 479	else
 480		seq_puts(m, ",iocharset=utf8");
 481#endif
 482	return 0;
 483}
 484
 485/*
 486 * look if the driver can tell the multi session redirection value
 487 *
 488 * don't change this if you don't know what you do, please!
 489 * Multisession is legal only with XA disks.
 490 * A non-XA disk with more than one volume descriptor may do it right, but
 491 * usually is written in a nowhere standardized "multi-partition" manner.
 492 * Multisession uses absolute addressing (solely the first frame of the whole
 493 * track is #0), multi-partition uses relative addressing (each first frame of
 494 * each track is #0), and a track is not a session.
 495 *
 496 * A broken CDwriter software or drive firmware does not set new standards,
 497 * at least not if conflicting with the existing ones.
 498 *
 499 * emoenke@gwdg.de
 500 */
 501#define WE_OBEY_THE_WRITTEN_STANDARDS 1
 502
 503static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 504{
 505	struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
 506	unsigned int vol_desc_start = 0;
 507
 508	if (session > 0) {
 509		struct cdrom_tocentry te;
 510
 511		if (!cdi)
 512			return 0;
 513
 514		te.cdte_track = session;
 515		te.cdte_format = CDROM_LBA;
 516		if (cdrom_read_tocentry(cdi, &te) == 0) {
 517			printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 518				session, te.cdte_addr.lba,
 519				te.cdte_ctrl & CDROM_DATA_TRACK);
 520			if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
 521				return te.cdte_addr.lba;
 522		}
 523
 524		printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 525	}
 526
 527	if (cdi) {
 528		struct cdrom_multisession ms_info;
 529
 530		ms_info.addr_format = CDROM_LBA;
 531		if (cdrom_multisession(cdi, &ms_info) == 0) {
 532#if WE_OBEY_THE_WRITTEN_STANDARDS
 533			/* necessary for a valid ms_info.addr */
 534			if (ms_info.xa_flag)
 535#endif
 536				vol_desc_start = ms_info.addr.lba;
 537		}
 538	}
 539
 540	return vol_desc_start;
 541}
 542
 543/*
 544 * Check if root directory is empty (has less than 3 files).
 545 *
 546 * Used to detect broken CDs where ISO root directory is empty but Joliet root
 547 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
 548 * (and Joliet used instead) or else no files would be visible.
 549 */
 550static bool rootdir_empty(struct super_block *sb, unsigned long block)
 551{
 552	int offset = 0, files = 0, de_len;
 553	struct iso_directory_record *de;
 554	struct buffer_head *bh;
 555
 556	bh = sb_bread(sb, block);
 557	if (!bh)
 558		return true;
 559	while (files < 3) {
 560		de = (struct iso_directory_record *) (bh->b_data + offset);
 561		de_len = *(unsigned char *) de;
 562		if (de_len == 0)
 563			break;
 564		files++;
 565		offset += de_len;
 566	}
 567	brelse(bh);
 568	return files < 3;
 569}
 570
 571/*
 572 * Initialize the superblock and read the root inode.
 573 */
 574static int isofs_fill_super(struct super_block *s, struct fs_context *fc)
 575{
 576	struct buffer_head *bh = NULL, *pri_bh = NULL;
 577	struct hs_primary_descriptor *h_pri = NULL;
 578	struct iso_primary_descriptor *pri = NULL;
 579	struct iso_supplementary_descriptor *sec = NULL;
 580	struct iso_directory_record *rootp;
 581	struct inode *inode;
 582	struct isofs_options *opt = fc->fs_private;
 583	struct isofs_sb_info *sbi;
 584	unsigned long first_data_zone;
 585	int joliet_level = 0;
 586	int iso_blknum, block;
 587	int orig_zonesize;
 588	int table, error = -EINVAL;
 589	unsigned int vol_desc_start;
 590	int silent = fc->sb_flags & SB_SILENT;
 591
 592	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 593	if (!sbi)
 594		return -ENOMEM;
 595	s->s_fs_info = sbi;
 596
 597	/*
 598	 * First of all, get the hardware blocksize for this device.
 599	 * If we don't know what it is, or the hardware blocksize is
 600	 * larger than the blocksize the user specified, then use
 601	 * that value.
 602	 */
 603	/*
 604	 * What if bugger tells us to go beyond page size?
 605	 */
 606	if (bdev_logical_block_size(s->s_bdev) > 2048) {
 607		printk(KERN_WARNING
 608		       "ISOFS: unsupported/invalid hardware sector size %d\n",
 609			bdev_logical_block_size(s->s_bdev));
 610		goto out_freesbi;
 611	}
 612	opt->blocksize = sb_min_blocksize(s, opt->blocksize);
 613	if (!opt->blocksize) {
 614		printk(KERN_ERR
 615		       "ISOFS: unable to set blocksize\n");
 616		goto out_freesbi;
 617	}
 618
 619	sbi->s_high_sierra = 0; /* default is iso9660 */
 620	sbi->s_session = opt->session;
 621	sbi->s_sbsector = opt->sbsector;
 622
 623	vol_desc_start = (opt->sbsector != -1) ?
 624		opt->sbsector : isofs_get_last_session(s, opt->session);
 625
 626	for (iso_blknum = vol_desc_start+16;
 627		iso_blknum < vol_desc_start+100; iso_blknum++) {
 628		struct hs_volume_descriptor *hdp;
 629		struct iso_volume_descriptor  *vdp;
 630
 631		block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 632		if (!(bh = sb_bread(s, block)))
 633			goto out_no_read;
 634
 635		vdp = (struct iso_volume_descriptor *)bh->b_data;
 636		hdp = (struct hs_volume_descriptor *)bh->b_data;
 637
 638		/*
 639		 * Due to the overlapping physical location of the descriptors,
 640		 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 641		 * proper identification in this case, we first check for ISO.
 642		 */
 643		if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 644			if (isonum_711(vdp->type) == ISO_VD_END)
 645				break;
 646			if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 647				if (!pri) {
 648					pri = (struct iso_primary_descriptor *)vdp;
 649					/* Save the buffer in case we need it ... */
 650					pri_bh = bh;
 651					bh = NULL;
 652				}
 653			}
 654#ifdef CONFIG_JOLIET
 655			else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 656				sec = (struct iso_supplementary_descriptor *)vdp;
 657				if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 658					if (opt->joliet) {
 659						if (sec->escape[2] == 0x40)
 660							joliet_level = 1;
 661						else if (sec->escape[2] == 0x43)
 662							joliet_level = 2;
 663						else if (sec->escape[2] == 0x45)
 664							joliet_level = 3;
 665
 666						printk(KERN_DEBUG "ISO 9660 Extensions: "
 667							"Microsoft Joliet Level %d\n",
 668							joliet_level);
 669					}
 670					goto root_found;
 671				} else {
 672				/* Unknown supplementary volume descriptor */
 673				sec = NULL;
 674				}
 675			}
 676#endif
 677		} else {
 678			if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 679				if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 680					goto out_freebh;
 681
 682				sbi->s_high_sierra = 1;
 683				opt->rock = 0;
 684				h_pri = (struct hs_primary_descriptor *)vdp;
 685				goto root_found;
 686			}
 687		}
 688
 689		/* Just skip any volume descriptors we don't recognize */
 690
 691		brelse(bh);
 692		bh = NULL;
 693	}
 694	/*
 695	 * If we fall through, either no volume descriptor was found,
 696	 * or else we passed a primary descriptor looking for others.
 697	 */
 698	if (!pri)
 699		goto out_unknown_format;
 700	brelse(bh);
 701	bh = pri_bh;
 702	pri_bh = NULL;
 703
 704root_found:
 705	/* We don't support read-write mounts */
 706	if (!sb_rdonly(s)) {
 707		error = -EACCES;
 708		goto out_freebh;
 709	}
 710
 711	if (joliet_level && (!pri || !opt->rock)) {
 712		/* This is the case of Joliet with the norock mount flag.
 713		 * A disc with both Joliet and Rock Ridge is handled later
 714		 */
 715		pri = (struct iso_primary_descriptor *) sec;
 716	}
 717
 718	if(sbi->s_high_sierra){
 719		rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 720		sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 721		sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 722		sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 723	} else {
 724		if (!pri)
 725			goto out_freebh;
 726		rootp = (struct iso_directory_record *) pri->root_directory_record;
 727		sbi->s_nzones = isonum_733(pri->volume_space_size);
 728		sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 729		sbi->s_max_size = isonum_733(pri->volume_space_size);
 730	}
 731
 732	sbi->s_ninodes = 0; /* No way to figure this out easily */
 733
 734	orig_zonesize = sbi->s_log_zone_size;
 735	/*
 736	 * If the zone size is smaller than the hardware sector size,
 737	 * this is a fatal error.  This would occur if the disc drive
 738	 * had sectors that were 2048 bytes, but the filesystem had
 739	 * blocks that were 512 bytes (which should only very rarely
 740	 * happen.)
 741	 */
 742	if (orig_zonesize < opt->blocksize)
 743		goto out_bad_size;
 744
 745	/* RDE: convert log zone size to bit shift */
 746	switch (sbi->s_log_zone_size) {
 747	case  512: sbi->s_log_zone_size =  9; break;
 748	case 1024: sbi->s_log_zone_size = 10; break;
 749	case 2048: sbi->s_log_zone_size = 11; break;
 750
 751	default:
 752		goto out_bad_zone_size;
 753	}
 754
 755	s->s_magic = ISOFS_SUPER_MAGIC;
 756
 757	/*
 758	 * With multi-extent files, file size is only limited by the maximum
 759	 * size of a file system, which is 8 TB.
 760	 */
 761	s->s_maxbytes = 0x80000000000LL;
 762
 763	/* ECMA-119 timestamp from 1900/1/1 with tz offset */
 764	s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
 765	s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
 766
 767	/* Set this for reference. Its not currently used except on write
 768	   which we don't have .. */
 769
 770	first_data_zone = isonum_733(rootp->extent) +
 771			  isonum_711(rootp->ext_attr_length);
 772	sbi->s_firstdatazone = first_data_zone;
 773#ifndef BEQUIET
 774	printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 775		sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 776	printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 777	if(sbi->s_high_sierra)
 778		printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 779#endif
 780
 781	/*
 782	 * If the Joliet level is set, we _may_ decide to use the
 783	 * secondary descriptor, but can't be sure until after we
 784	 * read the root inode. But before reading the root inode
 785	 * we may need to change the device blocksize, and would
 786	 * rather release the old buffer first. So, we cache the
 787	 * first_data_zone value from the secondary descriptor.
 788	 */
 789	if (joliet_level) {
 790		pri = (struct iso_primary_descriptor *) sec;
 791		rootp = (struct iso_directory_record *)
 792			pri->root_directory_record;
 793		first_data_zone = isonum_733(rootp->extent) +
 794				isonum_711(rootp->ext_attr_length);
 795	}
 796
 797	/*
 798	 * We're all done using the volume descriptor, and may need
 799	 * to change the device blocksize, so release the buffer now.
 800	 */
 801	brelse(pri_bh);
 802	brelse(bh);
 803
 804	/*
 805	 * Force the blocksize to 512 for 512 byte sectors.  The file
 806	 * read primitives really get it wrong in a bad way if we don't
 807	 * do this.
 808	 *
 809	 * Note - we should never be setting the blocksize to something
 810	 * less than the hardware sector size for the device.  If we
 811	 * do, we would end up having to read larger buffers and split
 812	 * out portions to satisfy requests.
 813	 *
 814	 * Note2- the idea here is that we want to deal with the optimal
 815	 * zonesize in the filesystem.  If we have it set to something less,
 816	 * then we have horrible problems with trying to piece together
 817	 * bits of adjacent blocks in order to properly read directory
 818	 * entries.  By forcing the blocksize in this way, we ensure
 819	 * that we will never be required to do this.
 820	 */
 821	sb_set_blocksize(s, orig_zonesize);
 822
 823	sbi->s_nls_iocharset = NULL;
 824
 825#ifdef CONFIG_JOLIET
 826	if (joliet_level) {
 827		char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT;
 828		if (strcmp(p, "utf8") != 0) {
 829			sbi->s_nls_iocharset = opt->iocharset ?
 830				load_nls(opt->iocharset) : load_nls_default();
 831			if (!sbi->s_nls_iocharset)
 832				goto out_freesbi;
 833		}
 834	}
 835#endif
 836	s->s_op = &isofs_sops;
 837	s->s_export_op = &isofs_export_ops;
 838	sbi->s_mapping = opt->map;
 839	sbi->s_rock = (opt->rock ? 2 : 0);
 840	sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 841	sbi->s_cruft = opt->cruft;
 842	sbi->s_hide = opt->hide;
 843	sbi->s_showassoc = opt->showassoc;
 844	sbi->s_uid = opt->uid;
 845	sbi->s_gid = opt->gid;
 846	sbi->s_uid_set = opt->uid_set;
 847	sbi->s_gid_set = opt->gid_set;
 848	sbi->s_nocompress = opt->nocompress;
 849	sbi->s_overriderockperm = opt->overriderockperm;
 850	/*
 851	 * It would be incredibly stupid to allow people to mark every file
 852	 * on the disk as suid, so we merely allow them to set the default
 853	 * permissions.
 854	 */
 855	if (opt->fmode != ISOFS_INVALID_MODE)
 856		sbi->s_fmode = opt->fmode & 0777;
 857	else
 858		sbi->s_fmode = ISOFS_INVALID_MODE;
 859	if (opt->dmode != ISOFS_INVALID_MODE)
 860		sbi->s_dmode = opt->dmode & 0777;
 861	else
 862		sbi->s_dmode = ISOFS_INVALID_MODE;
 863
 864	/*
 865	 * Read the root inode, which _may_ result in changing
 866	 * the s_rock flag. Once we have the final s_rock value,
 867	 * we then decide whether to use the Joliet descriptor.
 868	 */
 869	inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 870
 871	/*
 872	 * Fix for broken CDs with a corrupt root inode but a correct Joliet
 873	 * root directory.
 874	 */
 875	if (IS_ERR(inode)) {
 876		if (joliet_level && sbi->s_firstdatazone != first_data_zone) {
 877			printk(KERN_NOTICE
 878			       "ISOFS: root inode is unusable. "
 879			       "Disabling Rock Ridge and switching to Joliet.");
 880			sbi->s_rock = 0;
 881			inode = NULL;
 882		} else {
 883			goto out_no_root;
 884		}
 885	}
 886
 887	/*
 888	 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
 889	 * correct Joliet root directory.
 890	 */
 891	if (sbi->s_rock == 1 && joliet_level &&
 892				rootdir_empty(s, sbi->s_firstdatazone)) {
 893		printk(KERN_NOTICE
 894			"ISOFS: primary root directory is empty. "
 895			"Disabling Rock Ridge and switching to Joliet.");
 896		sbi->s_rock = 0;
 897	}
 898
 899	/*
 900	 * If this disk has both Rock Ridge and Joliet on it, then we
 901	 * want to use Rock Ridge by default.  This can be overridden
 902	 * by using the norock mount option.  There is still one other
 903	 * possibility that is not taken into account: a Rock Ridge
 904	 * CD with Unicode names.  Until someone sees such a beast, it
 905	 * will not be supported.
 906	 */
 907	if (sbi->s_rock == 1) {
 908		joliet_level = 0;
 909	} else if (joliet_level) {
 910		sbi->s_rock = 0;
 911		if (sbi->s_firstdatazone != first_data_zone) {
 912			sbi->s_firstdatazone = first_data_zone;
 913			printk(KERN_DEBUG
 914				"ISOFS: changing to secondary root\n");
 915			iput(inode);
 916			inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 917			if (IS_ERR(inode))
 918				goto out_no_root;
 919		}
 920	}
 921
 922	if (opt->check == 'u') {
 923		/* Only Joliet is case insensitive by default */
 924		if (joliet_level)
 925			opt->check = 'r';
 926		else
 927			opt->check = 's';
 928	}
 929	sbi->s_joliet_level = joliet_level;
 930
 931	/* Make sure the root inode is a directory */
 932	if (!S_ISDIR(inode->i_mode)) {
 933		printk(KERN_WARNING
 934			"isofs_fill_super: root inode is not a directory. "
 935			"Corrupted media?\n");
 936		goto out_iput;
 937	}
 938
 939	table = 0;
 940	if (joliet_level)
 941		table += 2;
 942	if (opt->check == 'r')
 943		table++;
 944	sbi->s_check = opt->check;
 945
 946	if (table)
 947		set_default_d_op(s, &isofs_dentry_ops[table - 1]);
 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	return 0;
 957
 958	/*
 959	 * Display error messages and free resources.
 960	 */
 961out_iput:
 962	iput(inode);
 963	goto out_no_inode;
 964out_no_root:
 965	error = PTR_ERR(inode);
 966	if (error != -ENOMEM)
 967		printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 968out_no_inode:
 969#ifdef CONFIG_JOLIET
 970	unload_nls(sbi->s_nls_iocharset);
 971#endif
 972	goto out_freesbi;
 973out_no_read:
 974	printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 975		__func__, s->s_id, iso_blknum, block);
 976	goto out_freebh;
 977out_bad_zone_size:
 978	printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 979		sbi->s_log_zone_size);
 980	goto out_freebh;
 981out_bad_size:
 982	printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 983		orig_zonesize, opt->blocksize);
 984	goto out_freebh;
 985out_unknown_format:
 986	if (!silent)
 987		printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 988
 989out_freebh:
 990	brelse(bh);
 991	brelse(pri_bh);
 992out_freesbi:
 993	kfree(sbi);
 994	s->s_fs_info = NULL;
 995	return error;
 996}
 997
 998static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 999{
1000	struct super_block *sb = dentry->d_sb;
1001	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1002
1003	buf->f_type = ISOFS_SUPER_MAGIC;
1004	buf->f_bsize = sb->s_blocksize;
1005	buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1006		<< (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1007	buf->f_bfree = 0;
1008	buf->f_bavail = 0;
1009	buf->f_files = ISOFS_SB(sb)->s_ninodes;
1010	buf->f_ffree = 0;
1011	buf->f_fsid = u64_to_fsid(id);
1012	buf->f_namelen = NAME_MAX;
1013	return 0;
1014}
1015
1016/*
1017 * Get a set of blocks; filling in buffer_heads if already allocated
1018 * or getblk() if they are not.  Returns the number of blocks inserted
1019 * (-ve == error.)
1020 */
1021int isofs_get_blocks(struct inode *inode, sector_t iblock,
1022		     struct buffer_head **bh, unsigned long nblocks)
1023{
1024	unsigned long b_off = iblock;
1025	unsigned offset, sect_size;
1026	unsigned int firstext;
1027	unsigned long nextblk, nextoff;
1028	int section, rv, error;
1029	struct iso_inode_info *ei = ISOFS_I(inode);
1030
1031	error = -EIO;
1032	rv = 0;
1033	if (iblock != b_off) {
1034		printk(KERN_DEBUG "%s: block number too large\n", __func__);
1035		goto abort;
1036	}
1037
1038
1039	offset = 0;
1040	firstext = ei->i_first_extent;
1041	sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1042	nextblk = ei->i_next_section_block;
1043	nextoff = ei->i_next_section_offset;
1044	section = 0;
1045
1046	while (nblocks) {
1047		/* If we are *way* beyond the end of the file, print a message.
1048		 * Access beyond the end of the file up to the next page boundary
1049		 * is normal, however because of the way the page cache works.
1050		 * In this case, we just return 0 so that we can properly fill
1051		 * the page with useless information without generating any
1052		 * I/O errors.
1053		 */
1054		if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1055			printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1056				__func__, b_off,
1057				(unsigned long long)inode->i_size);
1058			goto abort;
1059		}
1060
1061		/* On the last section, nextblk == 0, section size is likely to
1062		 * exceed sect_size by a partial block, and access beyond the
1063		 * end of the file will reach beyond the section size, too.
1064		 */
1065		while (nextblk && (b_off >= (offset + sect_size))) {
1066			struct inode *ninode;
1067
1068			offset += sect_size;
1069			ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1070			if (IS_ERR(ninode)) {
1071				error = PTR_ERR(ninode);
1072				goto abort;
1073			}
1074			firstext  = ISOFS_I(ninode)->i_first_extent;
1075			sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1076			nextblk   = ISOFS_I(ninode)->i_next_section_block;
1077			nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1078			iput(ninode);
1079
1080			if (++section > 100) {
1081				printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1082					" aborting...\n", __func__);
1083				printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1084					"nextblk=%lu nextoff=%lu\n", __func__,
1085					b_off, firstext, (unsigned) sect_size,
1086					nextblk, nextoff);
1087				goto abort;
1088			}
1089		}
1090
1091		if (*bh) {
1092			map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1093		} else {
1094			*bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1095			if (!*bh)
1096				goto abort;
1097		}
1098		bh++;	/* Next buffer head */
1099		b_off++;	/* Next buffer offset */
1100		nblocks--;
1101		rv++;
1102	}
1103
1104	error = 0;
1105abort:
1106	return rv != 0 ? rv : error;
1107}
1108
1109/*
1110 * Used by the standard interfaces.
1111 */
1112static int isofs_get_block(struct inode *inode, sector_t iblock,
1113		    struct buffer_head *bh_result, int create)
1114{
1115	int ret;
1116
1117	if (create) {
1118		printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1119		return -EROFS;
1120	}
1121
1122	ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1123	return ret < 0 ? ret : 0;
1124}
1125
1126static int isofs_bmap(struct inode *inode, sector_t block)
1127{
1128	struct buffer_head dummy;
1129	int error;
1130
1131	dummy.b_state = 0;
1132	dummy.b_blocknr = -1000;
1133	error = isofs_get_block(inode, block, &dummy, 0);
1134	if (!error)
1135		return dummy.b_blocknr;
1136	return 0;
1137}
1138
1139struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1140{
1141	sector_t blknr = isofs_bmap(inode, block);
1142	if (!blknr)
1143		return NULL;
1144	return sb_bread(inode->i_sb, blknr);
1145}
1146
1147static int isofs_read_folio(struct file *file, struct folio *folio)
1148{
1149	return mpage_read_folio(folio, isofs_get_block);
1150}
1151
1152static void isofs_readahead(struct readahead_control *rac)
1153{
1154	mpage_readahead(rac, isofs_get_block);
1155}
1156
1157static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1158{
1159	return generic_block_bmap(mapping,block,isofs_get_block);
1160}
1161
1162static const struct address_space_operations isofs_aops = {
1163	.read_folio = isofs_read_folio,
1164	.readahead = isofs_readahead,
1165	.bmap = _isofs_bmap
1166};
1167
1168static int isofs_read_level3_size(struct inode *inode)
1169{
1170	unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1171	int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1172	struct buffer_head *bh = NULL;
1173	unsigned long block, offset, block_saved, offset_saved;
1174	int i = 0;
1175	int more_entries = 0;
1176	struct iso_directory_record *tmpde = NULL;
1177	struct iso_inode_info *ei = ISOFS_I(inode);
1178
1179	inode->i_size = 0;
1180
1181	/* The first 16 blocks are reserved as the System Area.  Thus,
1182	 * no inodes can appear in block 0.  We use this to flag that
1183	 * this is the last section. */
1184	ei->i_next_section_block = 0;
1185	ei->i_next_section_offset = 0;
1186
1187	block = ei->i_iget5_block;
1188	offset = ei->i_iget5_offset;
1189
1190	do {
1191		struct iso_directory_record *de;
1192		unsigned int de_len;
1193
1194		if (!bh) {
1195			bh = sb_bread(inode->i_sb, block);
1196			if (!bh)
1197				goto out_noread;
1198		}
1199		de = (struct iso_directory_record *) (bh->b_data + offset);
1200		de_len = *(unsigned char *) de;
1201
1202		if (de_len == 0) {
1203			brelse(bh);
1204			bh = NULL;
1205			++block;
1206			offset = 0;
1207			continue;
1208		}
1209
1210		block_saved = block;
1211		offset_saved = offset;
1212		offset += de_len;
1213
1214		/* Make sure we have a full directory entry */
1215		if (offset >= bufsize) {
1216			int slop = bufsize - offset + de_len;
1217			if (!tmpde) {
1218				tmpde = kmalloc(256, GFP_KERNEL);
1219				if (!tmpde)
1220					goto out_nomem;
1221			}
1222			memcpy(tmpde, de, slop);
1223			offset &= bufsize - 1;
1224			block++;
1225			brelse(bh);
1226			bh = NULL;
1227			if (offset) {
1228				bh = sb_bread(inode->i_sb, block);
1229				if (!bh)
1230					goto out_noread;
1231				memcpy((void *)tmpde+slop, bh->b_data, offset);
1232			}
1233			de = tmpde;
1234		}
1235
1236		inode->i_size += isonum_733(de->size);
1237		if (i == 1) {
1238			ei->i_next_section_block = block_saved;
1239			ei->i_next_section_offset = offset_saved;
1240		}
1241
1242		more_entries = de->flags[-high_sierra] & 0x80;
1243
1244		i++;
1245		if (i > 100)
1246			goto out_toomany;
1247	} while (more_entries);
1248out:
1249	kfree(tmpde);
1250	brelse(bh);
1251	return 0;
1252
1253out_nomem:
1254	brelse(bh);
1255	return -ENOMEM;
1256
1257out_noread:
1258	printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1259	kfree(tmpde);
1260	return -EIO;
1261
1262out_toomany:
1263	printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1264		"isofs_read_level3_size: inode=%lu\n",
1265		__func__, inode->i_ino);
1266	goto out;
1267}
1268
1269static int isofs_read_inode(struct inode *inode, int relocated)
1270{
1271	struct super_block *sb = inode->i_sb;
1272	struct isofs_sb_info *sbi = ISOFS_SB(sb);
1273	unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1274	unsigned long block;
1275	int high_sierra = sbi->s_high_sierra;
1276	struct buffer_head *bh;
1277	struct iso_directory_record *de;
1278	struct iso_directory_record *tmpde = NULL;
1279	unsigned int de_len;
1280	unsigned long offset;
1281	struct iso_inode_info *ei = ISOFS_I(inode);
1282	int ret = -EIO;
1283	struct timespec64 ts;
1284
1285	block = ei->i_iget5_block;
1286	bh = sb_bread(inode->i_sb, block);
1287	if (!bh)
1288		goto out_badread;
1289
1290	offset = ei->i_iget5_offset;
1291
1292	de = (struct iso_directory_record *) (bh->b_data + offset);
1293	de_len = *(unsigned char *) de;
1294	if (de_len < sizeof(struct iso_directory_record))
1295		goto fail;
1296
1297	if (offset + de_len > bufsize) {
1298		int frag1 = bufsize - offset;
1299
1300		tmpde = kmalloc(de_len, GFP_KERNEL);
1301		if (!tmpde) {
1302			ret = -ENOMEM;
1303			goto fail;
1304		}
1305		memcpy(tmpde, bh->b_data + offset, frag1);
1306		brelse(bh);
1307		bh = sb_bread(inode->i_sb, ++block);
1308		if (!bh)
1309			goto out_badread;
1310		memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1311		de = tmpde;
1312	}
1313
1314	inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1315					ei->i_iget5_offset,
1316					ISOFS_BUFFER_BITS(inode));
1317
1318	/* Assume it is a normal-format file unless told otherwise */
1319	ei->i_file_format = isofs_file_normal;
1320
1321	if (de->flags[-high_sierra] & 2) {
1322		if (sbi->s_dmode != ISOFS_INVALID_MODE)
1323			inode->i_mode = S_IFDIR | sbi->s_dmode;
1324		else
1325			inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1326		set_nlink(inode, 1);	/*
1327					 * Set to 1.  We know there are 2, but
1328					 * the find utility tries to optimize
1329					 * if it is 2, and it screws up.  It is
1330					 * easier to give 1 which tells find to
1331					 * do it the hard way.
1332					 */
1333	} else {
1334		if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1335			inode->i_mode = S_IFREG | sbi->s_fmode;
1336		} else {
1337			/*
1338			 * Set default permissions: r-x for all.  The disc
1339			 * could be shared with DOS machines so virtually
1340			 * anything could be a valid executable.
1341			 */
1342			inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1343		}
1344		set_nlink(inode, 1);
1345	}
1346	inode->i_uid = sbi->s_uid;
1347	inode->i_gid = sbi->s_gid;
1348	inode->i_blocks = 0;
1349
1350	ei->i_format_parm[0] = 0;
1351	ei->i_format_parm[1] = 0;
1352	ei->i_format_parm[2] = 0;
1353
1354	ei->i_section_size = isonum_733(de->size);
1355	if (de->flags[-high_sierra] & 0x80) {
1356		ret = isofs_read_level3_size(inode);
1357		if (ret < 0)
1358			goto fail;
1359		ret = -EIO;
1360	} else {
1361		ei->i_next_section_block = 0;
1362		ei->i_next_section_offset = 0;
1363		inode->i_size = isonum_733(de->size);
1364	}
1365
1366	/*
1367	 * Some dipshit decided to store some other bit of information
1368	 * in the high byte of the file length.  Truncate size in case
1369	 * this CDROM was mounted with the cruft option.
1370	 */
1371
1372	if (sbi->s_cruft)
1373		inode->i_size &= 0x00ffffff;
1374
1375	if (de->interleave[0]) {
1376		printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1377		inode->i_size = 0;
1378	}
1379
1380	/* I have no idea what file_unit_size is used for, so
1381	   we will flag it for now */
1382	if (de->file_unit_size[0] != 0) {
1383		printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1384			inode->i_ino);
1385	}
1386
1387	/* I have no idea what other flag bits are used for, so
1388	   we will flag it for now */
1389#ifdef DEBUG
1390	if((de->flags[-high_sierra] & ~2)!= 0){
1391		printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1392				"(%ld %x).\n",
1393			inode->i_ino, de->flags[-high_sierra]);
1394	}
1395#endif
1396	ts = iso_date(de->date, high_sierra ? ISO_DATE_HIGH_SIERRA : 0);
1397	inode_set_ctime_to_ts(inode, ts);
1398	inode_set_atime_to_ts(inode, ts);
1399	inode_set_mtime_to_ts(inode, ts);
1400
1401	ei->i_first_extent = (isonum_733(de->extent) +
1402			isonum_711(de->ext_attr_length));
1403
1404	/* Set the number of blocks for stat() - should be done before RR */
1405	inode->i_blocks = (inode->i_size + 511) >> 9;
1406
1407	/*
1408	 * Now test for possible Rock Ridge extensions which will override
1409	 * some of these numbers in the inode structure.
1410	 */
1411
1412	if (!high_sierra) {
1413		parse_rock_ridge_inode(de, inode, relocated);
1414		/* if we want uid/gid set, override the rock ridge setting */
1415		if (sbi->s_uid_set)
1416			inode->i_uid = sbi->s_uid;
1417		if (sbi->s_gid_set)
1418			inode->i_gid = sbi->s_gid;
1419	}
1420	/* Now set final access rights if overriding rock ridge setting */
1421	if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1422	    sbi->s_dmode != ISOFS_INVALID_MODE)
1423		inode->i_mode = S_IFDIR | sbi->s_dmode;
1424	if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1425	    sbi->s_fmode != ISOFS_INVALID_MODE)
1426		inode->i_mode = S_IFREG | sbi->s_fmode;
1427
1428	/* Install the inode operations vector */
1429	if (S_ISREG(inode->i_mode)) {
1430		inode->i_fop = &generic_ro_fops;
1431		switch (ei->i_file_format) {
1432#ifdef CONFIG_ZISOFS
1433		case isofs_file_compressed:
1434			inode->i_data.a_ops = &zisofs_aops;
1435			break;
1436#endif
1437		default:
1438			inode->i_data.a_ops = &isofs_aops;
1439			break;
1440		}
1441	} else if (S_ISDIR(inode->i_mode)) {
1442		inode->i_op = &isofs_dir_inode_operations;
1443		inode->i_fop = &isofs_dir_operations;
1444	} else if (S_ISLNK(inode->i_mode)) {
1445		inode->i_op = &page_symlink_inode_operations;
1446		inode_nohighmem(inode);
1447		inode->i_data.a_ops = &isofs_symlink_aops;
1448	} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
1449		   S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
1450		/* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1451		init_special_inode(inode, inode->i_mode, inode->i_rdev);
1452	} else {
1453		printk(KERN_DEBUG "ISOFS: Invalid file type 0%04o for inode %lu.\n",
1454			inode->i_mode, inode->i_ino);
1455		ret = -EIO;
1456		goto fail;
1457	}
1458
1459	ret = 0;
1460out:
1461	kfree(tmpde);
1462	brelse(bh);
1463	return ret;
1464
1465out_badread:
1466	printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1467fail:
1468	goto out;
1469}
1470
1471struct isofs_iget5_callback_data {
1472	unsigned long block;
1473	unsigned long offset;
1474};
1475
1476static int isofs_iget5_test(struct inode *ino, void *data)
1477{
1478	struct iso_inode_info *i = ISOFS_I(ino);
1479	struct isofs_iget5_callback_data *d =
1480		(struct isofs_iget5_callback_data*)data;
1481	return (i->i_iget5_block == d->block)
1482		&& (i->i_iget5_offset == d->offset);
1483}
1484
1485static int isofs_iget5_set(struct inode *ino, void *data)
1486{
1487	struct iso_inode_info *i = ISOFS_I(ino);
1488	struct isofs_iget5_callback_data *d =
1489		(struct isofs_iget5_callback_data*)data;
1490	i->i_iget5_block = d->block;
1491	i->i_iget5_offset = d->offset;
1492	return 0;
1493}
1494
1495/* Store, in the inode's containing structure, the block and block
1496 * offset that point to the underlying meta-data for the inode.  The
1497 * code below is otherwise similar to the iget() code in
1498 * include/linux/fs.h */
1499struct inode *__isofs_iget(struct super_block *sb,
1500			   unsigned long block,
1501			   unsigned long offset,
1502			   int relocated)
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_state_read_once(inode) & I_NEW) {
1524		ret = isofs_read_inode(inode, relocated);
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 int isofs_get_tree(struct fs_context *fc)
1537{
1538	return get_tree_bdev(fc, isofs_fill_super);
1539}
1540
1541static void isofs_free_fc(struct fs_context *fc)
1542{
1543	struct isofs_options *opt = fc->fs_private;
1544
1545	kfree(opt->iocharset);
1546	kfree(opt);
1547}
1548
1549static const struct fs_context_operations isofs_context_ops = {
1550	.parse_param	= isofs_parse_param,
1551	.get_tree	= isofs_get_tree,
1552	.reconfigure	= isofs_reconfigure,
1553	.free		= isofs_free_fc,
1554};
1555
1556static int isofs_init_fs_context(struct fs_context *fc)
1557{
1558	struct isofs_options *opt;
1559
1560	opt = kzalloc(sizeof(*opt), GFP_KERNEL);
1561	if (!opt)
1562		return -ENOMEM;
1563
1564	opt->map = 'n';
1565	opt->rock = 1;
1566	opt->joliet = 1;
1567	opt->cruft = 0;
1568	opt->hide = 0;
1569	opt->showassoc = 0;
1570	opt->check = 'u';		/* unset */
1571	opt->nocompress = 0;
1572	opt->blocksize = 1024;
1573	opt->fmode = opt->dmode = ISOFS_INVALID_MODE;
1574	opt->uid_set = 0;
1575	opt->gid_set = 0;
1576	opt->gid = GLOBAL_ROOT_GID;
1577	opt->uid = GLOBAL_ROOT_UID;
1578	opt->iocharset = NULL;
1579	opt->overriderockperm = 0;
1580	opt->session = -1;
1581	opt->sbsector = -1;
1582
1583	fc->fs_private = opt;
1584	fc->ops = &isofs_context_ops;
1585
1586	return 0;
1587}
1588
1589static struct file_system_type iso9660_fs_type = {
1590	.owner		= THIS_MODULE,
1591	.name		= "iso9660",
1592	.kill_sb	= kill_block_super,
1593	.fs_flags	= FS_REQUIRES_DEV,
1594	.init_fs_context = isofs_init_fs_context,
1595	.parameters	= isofs_param_spec,
1596};
1597MODULE_ALIAS_FS("iso9660");
1598MODULE_ALIAS("iso9660");
1599
1600static int __init init_iso9660_fs(void)
1601{
1602	int err = init_inodecache();
1603	if (err)
1604		goto out;
1605#ifdef CONFIG_ZISOFS
1606	err = zisofs_init();
1607	if (err)
1608		goto out1;
1609#endif
1610	err = register_filesystem(&iso9660_fs_type);
1611	if (err)
1612		goto out2;
1613	return 0;
1614out2:
1615#ifdef CONFIG_ZISOFS
1616	zisofs_cleanup();
1617out1:
1618#endif
1619	destroy_inodecache();
1620out:
1621	return err;
1622}
1623
1624static void __exit exit_iso9660_fs(void)
1625{
1626        unregister_filesystem(&iso9660_fs_type);
1627#ifdef CONFIG_ZISOFS
1628	zisofs_cleanup();
1629#endif
1630	destroy_inodecache();
1631}
1632
1633module_init(init_iso9660_fs)
1634module_exit(exit_iso9660_fs)
1635MODULE_DESCRIPTION("ISO 9660 CDROM file system support");
1636MODULE_LICENSE("GPL");