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