path: root/fs/isofs/inode.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/isofs/inode.c
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
 *      1994  Eberhard Mönkeberg - multi session handling.
 *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
 *	1997  Gordon Chaffee - Joliet CDs
 *	1998  Eric Lammerts - ISO 9660 Level 3
 *	2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
 *	2004  Paul Serice - NFS Export Operations
 */

#include <linux/init.h>
#include <linux/module.h>

#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/nls.h>
#include <linux/ctype.h>
#include <linux/statfs.h>
#include <linux/cdrom.h>
#include <linux/parser.h>
#include <linux/mpage.h>
#include <linux/user_namespace.h>
#include <linux/seq_file.h>
#include <linux/blkdev.h>

#include "isofs.h"
#include "zisofs.h"

/* max tz offset is 13 hours */
#define MAX_TZ_OFFSET (52*15*60)

#define BEQUIET

static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
static int isofs_dentry_cmpi(const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name);

#ifdef CONFIG_JOLIET
static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name);
static int isofs_dentry_cmp_ms(const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name);
#endif

static void isofs_put_super(struct super_block *sb)
{
	struct isofs_sb_info *sbi = ISOFS_SB(sb);

#ifdef CONFIG_JOLIET
	unload_nls(sbi->s_nls_iocharset);
#endif

	kfree(sbi);
	sb->s_fs_info = NULL;
	return;
}

static int isofs_read_inode(struct inode *, int relocated);
static int isofs_statfs (struct dentry *, struct kstatfs *);
static int isofs_show_options(struct seq_file *, struct dentry *);

static struct kmem_cache *isofs_inode_cachep;

static struct inode *isofs_alloc_inode(struct super_block *sb)
{
	struct iso_inode_info *ei;
	ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void isofs_free_inode(struct inode *inode)
{
	kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
}

static void init_once(void *foo)
{
	struct iso_inode_info *ei = foo;

	inode_init_once(&ei->vfs_inode);
}

static int __init init_inodecache(void)
{
	isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
					sizeof(struct iso_inode_info),
					0, (SLAB_RECLAIM_ACCOUNT|
					SLAB_MEM_SPREAD|SLAB_ACCOUNT),
					init_once);
	if (!isofs_inode_cachep)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(isofs_inode_cachep);
}

static int isofs_remount(struct super_block *sb, int *flags, char *data)
{
	sync_filesystem(sb);
	if (!(*flags & SB_RDONLY))
		return -EROFS;
	return 0;
}

static const struct super_operations isofs_sops = {
	.alloc_inode	= isofs_alloc_inode,
	.free_inode	= isofs_free_inode,
	.put_super	= isofs_put_super,
	.statfs		= isofs_statfs,
	.remount_fs	= isofs_remount,
	.show_options	= isofs_show_options,
};


static const struct dentry_operations isofs_dentry_ops[] = {
	{
		.d_hash		= isofs_hashi,
		.d_compare	= isofs_dentry_cmpi,
	},
#ifdef CONFIG_JOLIET
	{
		.d_hash		= isofs_hash_ms,
		.d_compare	= isofs_dentry_cmp_ms,
	},
	{
		.d_hash		= isofs_hashi_ms,
		.d_compare	= isofs_dentry_cmpi_ms,
	},
#endif
};

struct iso9660_options{
	unsigned int rock:1;
	unsigned int joliet:1;
	unsigned int cruft:1;
	unsigned int hide:1;
	unsigned int showassoc:1;
	unsigned int nocompress:1;
	unsigned int overriderockperm:1;
	unsigned int uid_set:1;
	unsigned int gid_set:1;
	unsigned int utf8:1;
	unsigned char map;
	unsigned char check;
	unsigned int blocksize;
	umode_t fmode;
	umode_t dmode;
	kgid_t gid;
	kuid_t uid;
	char *iocharset;
	/* LVE */
	s32 session;
	s32 sbsector;
};

/*
 * Compute the hash for the isofs name corresponding to the dentry.
 */
static int
isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
{