mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 18:26:39 +07:00
a7963eb7f4
Pull ext3 improvements, cleanups, reiserfs fix from Jan Kara: "various cleanups for ext2, ext3, udf, isofs, a documentation update for quota, and a fix of a race in reiserfs readdir implementation" * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: reiserfs: fix race in readdir ext2: acl: remove unneeded include of linux/capability.h ext3: explicitly remove inode from orphan list after failed direct io fs/isofs/inode.c add __init to init_inodecache() ext3: Speedup WB_SYNC_ALL pass fs/quota/Kconfig: Update filesystems ext3: Update outdated comment before ext3_ordered_writepage() ext3: Update PF_MEMALLOC handling in ext3_write_inode() ext2/3: use prandom_u32() instead of get_random_bytes() ext3: remove an unneeded check in ext3_new_blocks() ext3: remove unneeded check in ext3_ordered_writepage() fs: Mark function as static in ext3/xattr_security.c fs: Mark function as static in ext3/dir.c fs: Mark function as static in ext2/xattr_security.c ext3: Add __init macro to init_inodecache ext2: Add __init macro to init_inodecache udf: Add __init macro to init_inodecache fs: udf: parse_options: blocksize check
1577 lines
39 KiB
C
1577 lines
39 KiB
C
/*
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* linux/fs/isofs/inode.c
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*
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* (C) 1991 Linus Torvalds - minix filesystem
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* 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
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* 1994 Eberhard Mönkeberg - multi session handling.
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* 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
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* 1997 Gordon Chaffee - Joliet CDs
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* 1998 Eric Lammerts - ISO 9660 Level 3
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* 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
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* 2004 Paul Serice - NFS Export Operations
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/nls.h>
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#include <linux/ctype.h>
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#include <linux/statfs.h>
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#include <linux/cdrom.h>
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#include <linux/parser.h>
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#include <linux/mpage.h>
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#include <linux/user_namespace.h>
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#include "isofs.h"
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#include "zisofs.h"
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#define BEQUIET
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static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
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static int isofs_hash(const struct dentry *parent, struct qstr *qstr);
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static int isofs_dentry_cmpi(const struct dentry *parent,
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const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name);
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static int isofs_dentry_cmp(const struct dentry *parent,
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const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name);
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#ifdef CONFIG_JOLIET
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static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
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static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
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static int isofs_dentry_cmpi_ms(const struct dentry *parent,
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const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name);
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static int isofs_dentry_cmp_ms(const struct dentry *parent,
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const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name);
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#endif
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static void isofs_put_super(struct super_block *sb)
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{
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struct isofs_sb_info *sbi = ISOFS_SB(sb);
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#ifdef CONFIG_JOLIET
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unload_nls(sbi->s_nls_iocharset);
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#endif
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kfree(sbi);
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sb->s_fs_info = NULL;
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return;
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}
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static int isofs_read_inode(struct inode *);
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static int isofs_statfs (struct dentry *, struct kstatfs *);
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static struct kmem_cache *isofs_inode_cachep;
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static struct inode *isofs_alloc_inode(struct super_block *sb)
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{
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struct iso_inode_info *ei;
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ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
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if (!ei)
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return NULL;
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return &ei->vfs_inode;
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}
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static void isofs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
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}
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static void isofs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, isofs_i_callback);
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}
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static void init_once(void *foo)
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{
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struct iso_inode_info *ei = foo;
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inode_init_once(&ei->vfs_inode);
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}
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static int __init init_inodecache(void)
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{
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isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
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sizeof(struct iso_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD),
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init_once);
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if (isofs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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/*
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* Make sure all delayed rcu free inodes are flushed before we
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* destroy cache.
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*/
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rcu_barrier();
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kmem_cache_destroy(isofs_inode_cachep);
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}
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static int isofs_remount(struct super_block *sb, int *flags, char *data)
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{
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sync_filesystem(sb);
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if (!(*flags & MS_RDONLY))
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return -EROFS;
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return 0;
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}
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static const struct super_operations isofs_sops = {
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.alloc_inode = isofs_alloc_inode,
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.destroy_inode = isofs_destroy_inode,
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.put_super = isofs_put_super,
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.statfs = isofs_statfs,
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.remount_fs = isofs_remount,
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.show_options = generic_show_options,
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};
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static const struct dentry_operations isofs_dentry_ops[] = {
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{
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.d_hash = isofs_hash,
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.d_compare = isofs_dentry_cmp,
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},
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{
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.d_hash = isofs_hashi,
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.d_compare = isofs_dentry_cmpi,
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},
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#ifdef CONFIG_JOLIET
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{
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.d_hash = isofs_hash_ms,
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.d_compare = isofs_dentry_cmp_ms,
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},
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{
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.d_hash = isofs_hashi_ms,
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.d_compare = isofs_dentry_cmpi_ms,
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},
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#endif
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};
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struct iso9660_options{
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unsigned int rock:1;
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unsigned int joliet:1;
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unsigned int cruft:1;
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unsigned int hide:1;
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unsigned int showassoc:1;
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unsigned int nocompress:1;
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unsigned int overriderockperm:1;
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unsigned int uid_set:1;
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unsigned int gid_set:1;
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unsigned int utf8:1;
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unsigned char map;
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unsigned char check;
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unsigned int blocksize;
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umode_t fmode;
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umode_t dmode;
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kgid_t gid;
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kuid_t uid;
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char *iocharset;
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/* LVE */
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s32 session;
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s32 sbsector;
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};
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/*
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* Compute the hash for the isofs name corresponding to the dentry.
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*/
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static int
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isofs_hash_common(struct qstr *qstr, int ms)
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{
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const char *name;
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int len;
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len = qstr->len;
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name = qstr->name;
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if (ms) {
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while (len && name[len-1] == '.')
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len--;
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}
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qstr->hash = full_name_hash(name, len);
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return 0;
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}
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/*
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* Compute the hash for the isofs name corresponding to the dentry.
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*/
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static int
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isofs_hashi_common(struct qstr *qstr, int ms)
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{
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const char *name;
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int len;
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char c;
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unsigned long hash;
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len = qstr->len;
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name = qstr->name;
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if (ms) {
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while (len && name[len-1] == '.')
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len--;
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}
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hash = init_name_hash();
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while (len--) {
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c = tolower(*name++);
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hash = partial_name_hash(c, hash);
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}
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qstr->hash = end_name_hash(hash);
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return 0;
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}
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/*
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* Compare of two isofs names.
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*/
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static int isofs_dentry_cmp_common(
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unsigned int len, const char *str,
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const struct qstr *name, int ms, int ci)
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{
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int alen, blen;
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/* A filename cannot end in '.' or we treat it like it has none */
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alen = name->len;
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blen = len;
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if (ms) {
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while (alen && name->name[alen-1] == '.')
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alen--;
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while (blen && str[blen-1] == '.')
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blen--;
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}
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if (alen == blen) {
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if (ci) {
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if (strnicmp(name->name, str, alen) == 0)
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return 0;
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} else {
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if (strncmp(name->name, str, alen) == 0)
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return 0;
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}
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}
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return 1;
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}
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static int
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isofs_hash(const struct dentry *dentry, struct qstr *qstr)
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{
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return isofs_hash_common(qstr, 0);
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}
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static int
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isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
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{
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return isofs_hashi_common(qstr, 0);
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}
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static int
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isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name)
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{
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return isofs_dentry_cmp_common(len, str, name, 0, 0);
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}
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static int
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isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name)
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{
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return isofs_dentry_cmp_common(len, str, name, 0, 1);
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}
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#ifdef CONFIG_JOLIET
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static int
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isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
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{
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return isofs_hash_common(qstr, 1);
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}
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static int
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isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
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{
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return isofs_hashi_common(qstr, 1);
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}
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static int
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isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name)
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{
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return isofs_dentry_cmp_common(len, str, name, 1, 0);
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}
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static int
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isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name)
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{
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return isofs_dentry_cmp_common(len, str, name, 1, 1);
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}
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#endif
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enum {
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Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
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Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
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Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
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Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
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};
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static const match_table_t tokens = {
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{Opt_norock, "norock"},
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{Opt_nojoliet, "nojoliet"},
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{Opt_unhide, "unhide"},
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{Opt_hide, "hide"},
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{Opt_showassoc, "showassoc"},
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{Opt_cruft, "cruft"},
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{Opt_utf8, "utf8"},
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{Opt_iocharset, "iocharset=%s"},
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{Opt_map_a, "map=acorn"},
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{Opt_map_a, "map=a"},
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{Opt_map_n, "map=normal"},
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{Opt_map_n, "map=n"},
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{Opt_map_o, "map=off"},
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{Opt_map_o, "map=o"},
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{Opt_session, "session=%u"},
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{Opt_sb, "sbsector=%u"},
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{Opt_check_r, "check=relaxed"},
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{Opt_check_r, "check=r"},
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{Opt_check_s, "check=strict"},
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{Opt_check_s, "check=s"},
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_mode, "mode=%u"},
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{Opt_dmode, "dmode=%u"},
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{Opt_overriderockperm, "overriderockperm"},
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{Opt_block, "block=%u"},
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{Opt_ignore, "conv=binary"},
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{Opt_ignore, "conv=b"},
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{Opt_ignore, "conv=text"},
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{Opt_ignore, "conv=t"},
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{Opt_ignore, "conv=mtext"},
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{Opt_ignore, "conv=m"},
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{Opt_ignore, "conv=auto"},
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{Opt_ignore, "conv=a"},
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{Opt_nocompress, "nocompress"},
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{Opt_err, NULL}
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};
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static int parse_options(char *options, struct iso9660_options *popt)
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{
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char *p;
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int option;
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popt->map = 'n';
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popt->rock = 1;
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popt->joliet = 1;
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popt->cruft = 0;
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popt->hide = 0;
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popt->showassoc = 0;
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popt->check = 'u'; /* unset */
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popt->nocompress = 0;
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popt->blocksize = 1024;
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popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
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popt->uid_set = 0;
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popt->gid_set = 0;
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popt->gid = GLOBAL_ROOT_GID;
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popt->uid = GLOBAL_ROOT_UID;
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popt->iocharset = NULL;
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popt->utf8 = 0;
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popt->overriderockperm = 0;
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popt->session=-1;
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popt->sbsector=-1;
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if (!options)
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return 1;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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substring_t args[MAX_OPT_ARGS];
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unsigned n;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_norock:
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popt->rock = 0;
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break;
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case Opt_nojoliet:
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popt->joliet = 0;
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break;
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case Opt_hide:
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popt->hide = 1;
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break;
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case Opt_unhide:
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case Opt_showassoc:
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popt->showassoc = 1;
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break;
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case Opt_cruft:
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popt->cruft = 1;
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break;
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case Opt_utf8:
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popt->utf8 = 1;
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break;
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#ifdef CONFIG_JOLIET
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case Opt_iocharset:
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popt->iocharset = match_strdup(&args[0]);
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break;
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#endif
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case Opt_map_a:
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popt->map = 'a';
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break;
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case Opt_map_o:
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popt->map = 'o';
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break;
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case Opt_map_n:
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popt->map = 'n';
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break;
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case Opt_session:
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if (match_int(&args[0], &option))
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return 0;
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n = option;
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if (n > 99)
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return 0;
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popt->session = n + 1;
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break;
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case Opt_sb:
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if (match_int(&args[0], &option))
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return 0;
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popt->sbsector = option;
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break;
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case Opt_check_r:
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popt->check = 'r';
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break;
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case Opt_check_s:
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popt->check = 's';
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break;
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case Opt_ignore:
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break;
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case Opt_uid:
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if (match_int(&args[0], &option))
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return 0;
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popt->uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(popt->uid))
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return 0;
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popt->uid_set = 1;
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break;
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case Opt_gid:
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if (match_int(&args[0], &option))
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return 0;
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popt->gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(popt->gid))
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return 0;
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popt->gid_set = 1;
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break;
|
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case Opt_mode:
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if (match_int(&args[0], &option))
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return 0;
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popt->fmode = option;
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break;
|
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case Opt_dmode:
|
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if (match_int(&args[0], &option))
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return 0;
|
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popt->dmode = option;
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break;
|
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case Opt_overriderockperm:
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popt->overriderockperm = 1;
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break;
|
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case Opt_block:
|
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if (match_int(&args[0], &option))
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return 0;
|
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n = option;
|
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if (n != 512 && n != 1024 && n != 2048)
|
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return 0;
|
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popt->blocksize = n;
|
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break;
|
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case Opt_nocompress:
|
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popt->nocompress = 1;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
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return 1;
|
|
}
|
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|
|
/*
|
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* look if the driver can tell the multi session redirection value
|
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*
|
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* don't change this if you don't know what you do, please!
|
|
* Multisession is legal only with XA disks.
|
|
* A non-XA disk with more than one volume descriptor may do it right, but
|
|
* usually is written in a nowhere standardized "multi-partition" manner.
|
|
* Multisession uses absolute addressing (solely the first frame of the whole
|
|
* track is #0), multi-partition uses relative addressing (each first frame of
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|
* each track is #0), and a track is not a session.
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*
|
|
* A broken CDwriter software or drive firmware does not set new standards,
|
|
* at least not if conflicting with the existing ones.
|
|
*
|
|
* emoenke@gwdg.de
|
|
*/
|
|
#define WE_OBEY_THE_WRITTEN_STANDARDS 1
|
|
|
|
static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
|
|
{
|
|
struct cdrom_multisession ms_info;
|
|
unsigned int vol_desc_start;
|
|
struct block_device *bdev = sb->s_bdev;
|
|
int i;
|
|
|
|
vol_desc_start=0;
|
|
ms_info.addr_format=CDROM_LBA;
|
|
if(session >= 0 && session <= 99) {
|
|
struct cdrom_tocentry Te;
|
|
Te.cdte_track=session;
|
|
Te.cdte_format=CDROM_LBA;
|
|
i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
|
|
if (!i) {
|
|
printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
|
|
session, Te.cdte_addr.lba,
|
|
Te.cdte_ctrl&CDROM_DATA_TRACK);
|
|
if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
|
|
return Te.cdte_addr.lba;
|
|
}
|
|
|
|
printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
|
|
}
|
|
i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
|
|
if (session > 0)
|
|
printk(KERN_ERR "ISOFS: Invalid session number\n");
|
|
#if 0
|
|
printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
|
|
if (i==0) {
|
|
printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
|
|
printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
|
|
}
|
|
#endif
|
|
if (i==0)
|
|
#if WE_OBEY_THE_WRITTEN_STANDARDS
|
|
if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
|
|
#endif
|
|
vol_desc_start=ms_info.addr.lba;
|
|
return vol_desc_start;
|
|
}
|
|
|
|
/*
|
|
* Check if root directory is empty (has less than 3 files).
|
|
*
|
|
* Used to detect broken CDs where ISO root directory is empty but Joliet root
|
|
* directory is OK. If such CD has Rock Ridge extensions, they will be disabled
|
|
* (and Joliet used instead) or else no files would be visible.
|
|
*/
|
|
static bool rootdir_empty(struct super_block *sb, unsigned long block)
|
|
{
|
|
int offset = 0, files = 0, de_len;
|
|
struct iso_directory_record *de;
|
|
struct buffer_head *bh;
|
|
|
|
bh = sb_bread(sb, block);
|
|
if (!bh)
|
|
return true;
|
|
while (files < 3) {
|
|
de = (struct iso_directory_record *) (bh->b_data + offset);
|
|
de_len = *(unsigned char *) de;
|
|
if (de_len == 0)
|
|
break;
|
|
files++;
|
|
offset += de_len;
|
|
}
|
|
brelse(bh);
|
|
return files < 3;
|
|
}
|
|
|
|
/*
|
|
* Initialize the superblock and read the root inode.
|
|
*
|
|
* Note: a check_disk_change() has been done immediately prior
|
|
* to this call, so we don't need to check again.
|
|
*/
|
|
static int isofs_fill_super(struct super_block *s, void *data, int silent)
|
|
{
|
|
struct buffer_head *bh = NULL, *pri_bh = NULL;
|
|
struct hs_primary_descriptor *h_pri = NULL;
|
|
struct iso_primary_descriptor *pri = NULL;
|
|
struct iso_supplementary_descriptor *sec = NULL;
|
|
struct iso_directory_record *rootp;
|
|
struct inode *inode;
|
|
struct iso9660_options opt;
|
|
struct isofs_sb_info *sbi;
|
|
unsigned long first_data_zone;
|
|
int joliet_level = 0;
|
|
int iso_blknum, block;
|
|
int orig_zonesize;
|
|
int table, error = -EINVAL;
|
|
unsigned int vol_desc_start;
|
|
|
|
save_mount_options(s, data);
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
s->s_fs_info = sbi;
|
|
|
|
if (!parse_options((char *)data, &opt))
|
|
goto out_freesbi;
|
|
|
|
/*
|
|
* First of all, get the hardware blocksize for this device.
|
|
* If we don't know what it is, or the hardware blocksize is
|
|
* larger than the blocksize the user specified, then use
|
|
* that value.
|
|
*/
|
|
/*
|
|
* What if bugger tells us to go beyond page size?
|
|
*/
|
|
opt.blocksize = sb_min_blocksize(s, opt.blocksize);
|
|
|
|
sbi->s_high_sierra = 0; /* default is iso9660 */
|
|
|
|
vol_desc_start = (opt.sbsector != -1) ?
|
|
opt.sbsector : isofs_get_last_session(s,opt.session);
|
|
|
|
for (iso_blknum = vol_desc_start+16;
|
|
iso_blknum < vol_desc_start+100; iso_blknum++) {
|
|
struct hs_volume_descriptor *hdp;
|
|
struct iso_volume_descriptor *vdp;
|
|
|
|
block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
|
|
if (!(bh = sb_bread(s, block)))
|
|
goto out_no_read;
|
|
|
|
vdp = (struct iso_volume_descriptor *)bh->b_data;
|
|
hdp = (struct hs_volume_descriptor *)bh->b_data;
|
|
|
|
/*
|
|
* Due to the overlapping physical location of the descriptors,
|
|
* ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
|
|
* proper identification in this case, we first check for ISO.
|
|
*/
|
|
if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
|
|
if (isonum_711(vdp->type) == ISO_VD_END)
|
|
break;
|
|
if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
|
|
if (pri == NULL) {
|
|
pri = (struct iso_primary_descriptor *)vdp;
|
|
/* Save the buffer in case we need it ... */
|
|
pri_bh = bh;
|
|
bh = NULL;
|
|
}
|
|
}
|
|
#ifdef CONFIG_JOLIET
|
|
else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
|
|
sec = (struct iso_supplementary_descriptor *)vdp;
|
|
if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
|
|
if (opt.joliet) {
|
|
if (sec->escape[2] == 0x40)
|
|
joliet_level = 1;
|
|
else if (sec->escape[2] == 0x43)
|
|
joliet_level = 2;
|
|
else if (sec->escape[2] == 0x45)
|
|
joliet_level = 3;
|
|
|
|
printk(KERN_DEBUG "ISO 9660 Extensions: "
|
|
"Microsoft Joliet Level %d\n",
|
|
joliet_level);
|
|
}
|
|
goto root_found;
|
|
} else {
|
|
/* Unknown supplementary volume descriptor */
|
|
sec = NULL;
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
|
|
if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
|
|
goto out_freebh;
|
|
|
|
sbi->s_high_sierra = 1;
|
|
opt.rock = 0;
|
|
h_pri = (struct hs_primary_descriptor *)vdp;
|
|
goto root_found;
|
|
}
|
|
}
|
|
|
|
/* Just skip any volume descriptors we don't recognize */
|
|
|
|
brelse(bh);
|
|
bh = NULL;
|
|
}
|
|
/*
|
|
* If we fall through, either no volume descriptor was found,
|
|
* or else we passed a primary descriptor looking for others.
|
|
*/
|
|
if (!pri)
|
|
goto out_unknown_format;
|
|
brelse(bh);
|
|
bh = pri_bh;
|
|
pri_bh = NULL;
|
|
|
|
root_found:
|
|
|
|
if (joliet_level && (pri == NULL || !opt.rock)) {
|
|
/* This is the case of Joliet with the norock mount flag.
|
|
* A disc with both Joliet and Rock Ridge is handled later
|
|
*/
|
|
pri = (struct iso_primary_descriptor *) sec;
|
|
}
|
|
|
|
if(sbi->s_high_sierra){
|
|
rootp = (struct iso_directory_record *) h_pri->root_directory_record;
|
|
sbi->s_nzones = isonum_733(h_pri->volume_space_size);
|
|
sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
|
|
sbi->s_max_size = isonum_733(h_pri->volume_space_size);
|
|
} else {
|
|
if (!pri)
|
|
goto out_freebh;
|
|
rootp = (struct iso_directory_record *) pri->root_directory_record;
|
|
sbi->s_nzones = isonum_733(pri->volume_space_size);
|
|
sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
|
|
sbi->s_max_size = isonum_733(pri->volume_space_size);
|
|
}
|
|
|
|
sbi->s_ninodes = 0; /* No way to figure this out easily */
|
|
|
|
orig_zonesize = sbi->s_log_zone_size;
|
|
/*
|
|
* If the zone size is smaller than the hardware sector size,
|
|
* this is a fatal error. This would occur if the disc drive
|
|
* had sectors that were 2048 bytes, but the filesystem had
|
|
* blocks that were 512 bytes (which should only very rarely
|
|
* happen.)
|
|
*/
|
|
if (orig_zonesize < opt.blocksize)
|
|
goto out_bad_size;
|
|
|
|
/* RDE: convert log zone size to bit shift */
|
|
switch (sbi->s_log_zone_size) {
|
|
case 512: sbi->s_log_zone_size = 9; break;
|
|
case 1024: sbi->s_log_zone_size = 10; break;
|
|
case 2048: sbi->s_log_zone_size = 11; break;
|
|
|
|
default:
|
|
goto out_bad_zone_size;
|
|
}
|
|
|
|
s->s_magic = ISOFS_SUPER_MAGIC;
|
|
|
|
/*
|
|
* With multi-extent files, file size is only limited by the maximum
|
|
* size of a file system, which is 8 TB.
|
|
*/
|
|
s->s_maxbytes = 0x80000000000LL;
|
|
|
|
/* Set this for reference. Its not currently used except on write
|
|
which we don't have .. */
|
|
|
|
first_data_zone = isonum_733(rootp->extent) +
|
|
isonum_711(rootp->ext_attr_length);
|
|
sbi->s_firstdatazone = first_data_zone;
|
|
#ifndef BEQUIET
|
|
printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
|
|
sbi->s_max_size, 1UL << sbi->s_log_zone_size);
|
|
printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
|
|
if(sbi->s_high_sierra)
|
|
printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
|
|
#endif
|
|
|
|
/*
|
|
* If the Joliet level is set, we _may_ decide to use the
|
|
* secondary descriptor, but can't be sure until after we
|
|
* read the root inode. But before reading the root inode
|
|
* we may need to change the device blocksize, and would
|
|
* rather release the old buffer first. So, we cache the
|
|
* first_data_zone value from the secondary descriptor.
|
|
*/
|
|
if (joliet_level) {
|
|
pri = (struct iso_primary_descriptor *) sec;
|
|
rootp = (struct iso_directory_record *)
|
|
pri->root_directory_record;
|
|
first_data_zone = isonum_733(rootp->extent) +
|
|
isonum_711(rootp->ext_attr_length);
|
|
}
|
|
|
|
/*
|
|
* We're all done using the volume descriptor, and may need
|
|
* to change the device blocksize, so release the buffer now.
|
|
*/
|
|
brelse(pri_bh);
|
|
brelse(bh);
|
|
|
|
/*
|
|
* Force the blocksize to 512 for 512 byte sectors. The file
|
|
* read primitives really get it wrong in a bad way if we don't
|
|
* do this.
|
|
*
|
|
* Note - we should never be setting the blocksize to something
|
|
* less than the hardware sector size for the device. If we
|
|
* do, we would end up having to read larger buffers and split
|
|
* out portions to satisfy requests.
|
|
*
|
|
* Note2- the idea here is that we want to deal with the optimal
|
|
* zonesize in the filesystem. If we have it set to something less,
|
|
* then we have horrible problems with trying to piece together
|
|
* bits of adjacent blocks in order to properly read directory
|
|
* entries. By forcing the blocksize in this way, we ensure
|
|
* that we will never be required to do this.
|
|
*/
|
|
sb_set_blocksize(s, orig_zonesize);
|
|
|
|
sbi->s_nls_iocharset = NULL;
|
|
|
|
#ifdef CONFIG_JOLIET
|
|
if (joliet_level && opt.utf8 == 0) {
|
|
char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
|
|
sbi->s_nls_iocharset = load_nls(p);
|
|
if (! sbi->s_nls_iocharset) {
|
|
/* Fail only if explicit charset specified */
|
|
if (opt.iocharset)
|
|
goto out_freesbi;
|
|
sbi->s_nls_iocharset = load_nls_default();
|
|
}
|
|
}
|
|
#endif
|
|
s->s_op = &isofs_sops;
|
|
s->s_export_op = &isofs_export_ops;
|
|
sbi->s_mapping = opt.map;
|
|
sbi->s_rock = (opt.rock ? 2 : 0);
|
|
sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
|
|
sbi->s_cruft = opt.cruft;
|
|
sbi->s_hide = opt.hide;
|
|
sbi->s_showassoc = opt.showassoc;
|
|
sbi->s_uid = opt.uid;
|
|
sbi->s_gid = opt.gid;
|
|
sbi->s_uid_set = opt.uid_set;
|
|
sbi->s_gid_set = opt.gid_set;
|
|
sbi->s_utf8 = opt.utf8;
|
|
sbi->s_nocompress = opt.nocompress;
|
|
sbi->s_overriderockperm = opt.overriderockperm;
|
|
/*
|
|
* It would be incredibly stupid to allow people to mark every file
|
|
* on the disk as suid, so we merely allow them to set the default
|
|
* permissions.
|
|
*/
|
|
if (opt.fmode != ISOFS_INVALID_MODE)
|
|
sbi->s_fmode = opt.fmode & 0777;
|
|
else
|
|
sbi->s_fmode = ISOFS_INVALID_MODE;
|
|
if (opt.dmode != ISOFS_INVALID_MODE)
|
|
sbi->s_dmode = opt.dmode & 0777;
|
|
else
|
|
sbi->s_dmode = ISOFS_INVALID_MODE;
|
|
|
|
/*
|
|
* Read the root inode, which _may_ result in changing
|
|
* the s_rock flag. Once we have the final s_rock value,
|
|
* we then decide whether to use the Joliet descriptor.
|
|
*/
|
|
inode = isofs_iget(s, sbi->s_firstdatazone, 0);
|
|
if (IS_ERR(inode))
|
|
goto out_no_root;
|
|
|
|
/*
|
|
* Fix for broken CDs with Rock Ridge and empty ISO root directory but
|
|
* correct Joliet root directory.
|
|
*/
|
|
if (sbi->s_rock == 1 && joliet_level &&
|
|
rootdir_empty(s, sbi->s_firstdatazone)) {
|
|
printk(KERN_NOTICE
|
|
"ISOFS: primary root directory is empty. "
|
|
"Disabling Rock Ridge and switching to Joliet.");
|
|
sbi->s_rock = 0;
|
|
}
|
|
|
|
/*
|
|
* If this disk has both Rock Ridge and Joliet on it, then we
|
|
* want to use Rock Ridge by default. This can be overridden
|
|
* by using the norock mount option. There is still one other
|
|
* possibility that is not taken into account: a Rock Ridge
|
|
* CD with Unicode names. Until someone sees such a beast, it
|
|
* will not be supported.
|
|
*/
|
|
if (sbi->s_rock == 1) {
|
|
joliet_level = 0;
|
|
} else if (joliet_level) {
|
|
sbi->s_rock = 0;
|
|
if (sbi->s_firstdatazone != first_data_zone) {
|
|
sbi->s_firstdatazone = first_data_zone;
|
|
printk(KERN_DEBUG
|
|
"ISOFS: changing to secondary root\n");
|
|
iput(inode);
|
|
inode = isofs_iget(s, sbi->s_firstdatazone, 0);
|
|
if (IS_ERR(inode))
|
|
goto out_no_root;
|
|
}
|
|
}
|
|
|
|
if (opt.check == 'u') {
|
|
/* Only Joliet is case insensitive by default */
|
|
if (joliet_level)
|
|
opt.check = 'r';
|
|
else
|
|
opt.check = 's';
|
|
}
|
|
sbi->s_joliet_level = joliet_level;
|
|
|
|
/* Make sure the root inode is a directory */
|
|
if (!S_ISDIR(inode->i_mode)) {
|
|
printk(KERN_WARNING
|
|
"isofs_fill_super: root inode is not a directory. "
|
|
"Corrupted media?\n");
|
|
goto out_iput;
|
|
}
|
|
|
|
table = 0;
|
|
if (joliet_level)
|
|
table += 2;
|
|
if (opt.check == 'r')
|
|
table++;
|
|
|
|
s->s_d_op = &isofs_dentry_ops[table];
|
|
|
|
/* get the root dentry */
|
|
s->s_root = d_make_root(inode);
|
|
if (!(s->s_root)) {
|
|
error = -ENOMEM;
|
|
goto out_no_inode;
|
|
}
|
|
|
|
kfree(opt.iocharset);
|
|
|
|
return 0;
|
|
|
|
/*
|
|
* Display error messages and free resources.
|
|
*/
|
|
out_iput:
|
|
iput(inode);
|
|
goto out_no_inode;
|
|
out_no_root:
|
|
error = PTR_ERR(inode);
|
|
if (error != -ENOMEM)
|
|
printk(KERN_WARNING "%s: get root inode failed\n", __func__);
|
|
out_no_inode:
|
|
#ifdef CONFIG_JOLIET
|
|
unload_nls(sbi->s_nls_iocharset);
|
|
#endif
|
|
goto out_freesbi;
|
|
out_no_read:
|
|
printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
|
|
__func__, s->s_id, iso_blknum, block);
|
|
goto out_freebh;
|
|
out_bad_zone_size:
|
|
printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
|
|
sbi->s_log_zone_size);
|
|
goto out_freebh;
|
|
out_bad_size:
|
|
printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
|
|
orig_zonesize, opt.blocksize);
|
|
goto out_freebh;
|
|
out_unknown_format:
|
|
if (!silent)
|
|
printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
|
|
|
|
out_freebh:
|
|
brelse(bh);
|
|
brelse(pri_bh);
|
|
out_freesbi:
|
|
kfree(opt.iocharset);
|
|
kfree(sbi);
|
|
s->s_fs_info = NULL;
|
|
return error;
|
|
}
|
|
|
|
static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
buf->f_type = ISOFS_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = (ISOFS_SB(sb)->s_nzones
|
|
<< (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
|
|
buf->f_bfree = 0;
|
|
buf->f_bavail = 0;
|
|
buf->f_files = ISOFS_SB(sb)->s_ninodes;
|
|
buf->f_ffree = 0;
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
buf->f_namelen = NAME_MAX;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get a set of blocks; filling in buffer_heads if already allocated
|
|
* or getblk() if they are not. Returns the number of blocks inserted
|
|
* (-ve == error.)
|
|
*/
|
|
int isofs_get_blocks(struct inode *inode, sector_t iblock,
|
|
struct buffer_head **bh, unsigned long nblocks)
|
|
{
|
|
unsigned long b_off = iblock;
|
|
unsigned offset, sect_size;
|
|
unsigned int firstext;
|
|
unsigned long nextblk, nextoff;
|
|
int section, rv, error;
|
|
struct iso_inode_info *ei = ISOFS_I(inode);
|
|
|
|
error = -EIO;
|
|
rv = 0;
|
|
if (iblock != b_off) {
|
|
printk(KERN_DEBUG "%s: block number too large\n", __func__);
|
|
goto abort;
|
|
}
|
|
|
|
|
|
offset = 0;
|
|
firstext = ei->i_first_extent;
|
|
sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
|
|
nextblk = ei->i_next_section_block;
|
|
nextoff = ei->i_next_section_offset;
|
|
section = 0;
|
|
|
|
while (nblocks) {
|
|
/* If we are *way* beyond the end of the file, print a message.
|
|
* Access beyond the end of the file up to the next page boundary
|
|
* is normal, however because of the way the page cache works.
|
|
* In this case, we just return 0 so that we can properly fill
|
|
* the page with useless information without generating any
|
|
* I/O errors.
|
|
*/
|
|
if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
|
|
printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
|
|
__func__, b_off,
|
|
(unsigned long long)inode->i_size);
|
|
goto abort;
|
|
}
|
|
|
|
/* On the last section, nextblk == 0, section size is likely to
|
|
* exceed sect_size by a partial block, and access beyond the
|
|
* end of the file will reach beyond the section size, too.
|
|
*/
|
|
while (nextblk && (b_off >= (offset + sect_size))) {
|
|
struct inode *ninode;
|
|
|
|
offset += sect_size;
|
|
ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
|
|
if (IS_ERR(ninode)) {
|
|
error = PTR_ERR(ninode);
|
|
goto abort;
|
|
}
|
|
firstext = ISOFS_I(ninode)->i_first_extent;
|
|
sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
|
|
nextblk = ISOFS_I(ninode)->i_next_section_block;
|
|
nextoff = ISOFS_I(ninode)->i_next_section_offset;
|
|
iput(ninode);
|
|
|
|
if (++section > 100) {
|
|
printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
|
|
" aborting...\n", __func__);
|
|
printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
|
|
"nextblk=%lu nextoff=%lu\n", __func__,
|
|
b_off, firstext, (unsigned) sect_size,
|
|
nextblk, nextoff);
|
|
goto abort;
|
|
}
|
|
}
|
|
|
|
if (*bh) {
|
|
map_bh(*bh, inode->i_sb, firstext + b_off - offset);
|
|
} else {
|
|
*bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
|
|
if (!*bh)
|
|
goto abort;
|
|
}
|
|
bh++; /* Next buffer head */
|
|
b_off++; /* Next buffer offset */
|
|
nblocks--;
|
|
rv++;
|
|
}
|
|
|
|
error = 0;
|
|
abort:
|
|
return rv != 0 ? rv : error;
|
|
}
|
|
|
|
/*
|
|
* Used by the standard interfaces.
|
|
*/
|
|
static int isofs_get_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
int ret;
|
|
|
|
if (create) {
|
|
printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
|
|
return -EROFS;
|
|
}
|
|
|
|
ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static int isofs_bmap(struct inode *inode, sector_t block)
|
|
{
|
|
struct buffer_head dummy;
|
|
int error;
|
|
|
|
dummy.b_state = 0;
|
|
dummy.b_blocknr = -1000;
|
|
error = isofs_get_block(inode, block, &dummy, 0);
|
|
if (!error)
|
|
return dummy.b_blocknr;
|
|
return 0;
|
|
}
|
|
|
|
struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
|
|
{
|
|
sector_t blknr = isofs_bmap(inode, block);
|
|
if (!blknr)
|
|
return NULL;
|
|
return sb_bread(inode->i_sb, blknr);
|
|
}
|
|
|
|
static int isofs_readpage(struct file *file, struct page *page)
|
|
{
|
|
return mpage_readpage(page, isofs_get_block);
|
|
}
|
|
|
|
static int isofs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
|
|
}
|
|
|
|
static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
return generic_block_bmap(mapping,block,isofs_get_block);
|
|
}
|
|
|
|
static const struct address_space_operations isofs_aops = {
|
|
.readpage = isofs_readpage,
|
|
.readpages = isofs_readpages,
|
|
.bmap = _isofs_bmap
|
|
};
|
|
|
|
static int isofs_read_level3_size(struct inode *inode)
|
|
{
|
|
unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
|
|
int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
|
|
struct buffer_head *bh = NULL;
|
|
unsigned long block, offset, block_saved, offset_saved;
|
|
int i = 0;
|
|
int more_entries = 0;
|
|
struct iso_directory_record *tmpde = NULL;
|
|
struct iso_inode_info *ei = ISOFS_I(inode);
|
|
|
|
inode->i_size = 0;
|
|
|
|
/* The first 16 blocks are reserved as the System Area. Thus,
|
|
* no inodes can appear in block 0. We use this to flag that
|
|
* this is the last section. */
|
|
ei->i_next_section_block = 0;
|
|
ei->i_next_section_offset = 0;
|
|
|
|
block = ei->i_iget5_block;
|
|
offset = ei->i_iget5_offset;
|
|
|
|
do {
|
|
struct iso_directory_record *de;
|
|
unsigned int de_len;
|
|
|
|
if (!bh) {
|
|
bh = sb_bread(inode->i_sb, block);
|
|
if (!bh)
|
|
goto out_noread;
|
|
}
|
|
de = (struct iso_directory_record *) (bh->b_data + offset);
|
|
de_len = *(unsigned char *) de;
|
|
|
|
if (de_len == 0) {
|
|
brelse(bh);
|
|
bh = NULL;
|
|
++block;
|
|
offset = 0;
|
|
continue;
|
|
}
|
|
|
|
block_saved = block;
|
|
offset_saved = offset;
|
|
offset += de_len;
|
|
|
|
/* Make sure we have a full directory entry */
|
|
if (offset >= bufsize) {
|
|
int slop = bufsize - offset + de_len;
|
|
if (!tmpde) {
|
|
tmpde = kmalloc(256, GFP_KERNEL);
|
|
if (!tmpde)
|
|
goto out_nomem;
|
|
}
|
|
memcpy(tmpde, de, slop);
|
|
offset &= bufsize - 1;
|
|
block++;
|
|
brelse(bh);
|
|
bh = NULL;
|
|
if (offset) {
|
|
bh = sb_bread(inode->i_sb, block);
|
|
if (!bh)
|
|
goto out_noread;
|
|
memcpy((void *)tmpde+slop, bh->b_data, offset);
|
|
}
|
|
de = tmpde;
|
|
}
|
|
|
|
inode->i_size += isonum_733(de->size);
|
|
if (i == 1) {
|
|
ei->i_next_section_block = block_saved;
|
|
ei->i_next_section_offset = offset_saved;
|
|
}
|
|
|
|
more_entries = de->flags[-high_sierra] & 0x80;
|
|
|
|
i++;
|
|
if (i > 100)
|
|
goto out_toomany;
|
|
} while (more_entries);
|
|
out:
|
|
kfree(tmpde);
|
|
if (bh)
|
|
brelse(bh);
|
|
return 0;
|
|
|
|
out_nomem:
|
|
if (bh)
|
|
brelse(bh);
|
|
return -ENOMEM;
|
|
|
|
out_noread:
|
|
printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
|
|
kfree(tmpde);
|
|
return -EIO;
|
|
|
|
out_toomany:
|
|
printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
|
|
"isofs_read_level3_size: inode=%lu\n",
|
|
__func__, inode->i_ino);
|
|
goto out;
|
|
}
|
|
|
|
static int isofs_read_inode(struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct isofs_sb_info *sbi = ISOFS_SB(sb);
|
|
unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
|
|
unsigned long block;
|
|
int high_sierra = sbi->s_high_sierra;
|
|
struct buffer_head *bh = NULL;
|
|
struct iso_directory_record *de;
|
|
struct iso_directory_record *tmpde = NULL;
|
|
unsigned int de_len;
|
|
unsigned long offset;
|
|
struct iso_inode_info *ei = ISOFS_I(inode);
|
|
int ret = -EIO;
|
|
|
|
block = ei->i_iget5_block;
|
|
bh = sb_bread(inode->i_sb, block);
|
|
if (!bh)
|
|
goto out_badread;
|
|
|
|
offset = ei->i_iget5_offset;
|
|
|
|
de = (struct iso_directory_record *) (bh->b_data + offset);
|
|
de_len = *(unsigned char *) de;
|
|
|
|
if (offset + de_len > bufsize) {
|
|
int frag1 = bufsize - offset;
|
|
|
|
tmpde = kmalloc(de_len, GFP_KERNEL);
|
|
if (tmpde == NULL) {
|
|
printk(KERN_INFO "%s: out of memory\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
memcpy(tmpde, bh->b_data + offset, frag1);
|
|
brelse(bh);
|
|
bh = sb_bread(inode->i_sb, ++block);
|
|
if (!bh)
|
|
goto out_badread;
|
|
memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
|
|
de = tmpde;
|
|
}
|
|
|
|
inode->i_ino = isofs_get_ino(ei->i_iget5_block,
|
|
ei->i_iget5_offset,
|
|
ISOFS_BUFFER_BITS(inode));
|
|
|
|
/* Assume it is a normal-format file unless told otherwise */
|
|
ei->i_file_format = isofs_file_normal;
|
|
|
|
if (de->flags[-high_sierra] & 2) {
|
|
if (sbi->s_dmode != ISOFS_INVALID_MODE)
|
|
inode->i_mode = S_IFDIR | sbi->s_dmode;
|
|
else
|
|
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
|
|
set_nlink(inode, 1); /*
|
|
* Set to 1. We know there are 2, but
|
|
* the find utility tries to optimize
|
|
* if it is 2, and it screws up. It is
|
|
* easier to give 1 which tells find to
|
|
* do it the hard way.
|
|
*/
|
|
} else {
|
|
if (sbi->s_fmode != ISOFS_INVALID_MODE) {
|
|
inode->i_mode = S_IFREG | sbi->s_fmode;
|
|
} else {
|
|
/*
|
|
* Set default permissions: r-x for all. The disc
|
|
* could be shared with DOS machines so virtually
|
|
* anything could be a valid executable.
|
|
*/
|
|
inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
|
|
}
|
|
set_nlink(inode, 1);
|
|
}
|
|
inode->i_uid = sbi->s_uid;
|
|
inode->i_gid = sbi->s_gid;
|
|
inode->i_blocks = 0;
|
|
|
|
ei->i_format_parm[0] = 0;
|
|
ei->i_format_parm[1] = 0;
|
|
ei->i_format_parm[2] = 0;
|
|
|
|
ei->i_section_size = isonum_733(de->size);
|
|
if (de->flags[-high_sierra] & 0x80) {
|
|
ret = isofs_read_level3_size(inode);
|
|
if (ret < 0)
|
|
goto fail;
|
|
ret = -EIO;
|
|
} else {
|
|
ei->i_next_section_block = 0;
|
|
ei->i_next_section_offset = 0;
|
|
inode->i_size = isonum_733(de->size);
|
|
}
|
|
|
|
/*
|
|
* Some dipshit decided to store some other bit of information
|
|
* in the high byte of the file length. Truncate size in case
|
|
* this CDROM was mounted with the cruft option.
|
|
*/
|
|
|
|
if (sbi->s_cruft)
|
|
inode->i_size &= 0x00ffffff;
|
|
|
|
if (de->interleave[0]) {
|
|
printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
|
|
inode->i_size = 0;
|
|
}
|
|
|
|
/* I have no idea what file_unit_size is used for, so
|
|
we will flag it for now */
|
|
if (de->file_unit_size[0] != 0) {
|
|
printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
|
|
inode->i_ino);
|
|
}
|
|
|
|
/* I have no idea what other flag bits are used for, so
|
|
we will flag it for now */
|
|
#ifdef DEBUG
|
|
if((de->flags[-high_sierra] & ~2)!= 0){
|
|
printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
|
|
"(%ld %x).\n",
|
|
inode->i_ino, de->flags[-high_sierra]);
|
|
}
|
|
#endif
|
|
|
|
inode->i_mtime.tv_sec =
|
|
inode->i_atime.tv_sec =
|
|
inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
|
|
inode->i_mtime.tv_nsec =
|
|
inode->i_atime.tv_nsec =
|
|
inode->i_ctime.tv_nsec = 0;
|
|
|
|
ei->i_first_extent = (isonum_733(de->extent) +
|
|
isonum_711(de->ext_attr_length));
|
|
|
|
/* Set the number of blocks for stat() - should be done before RR */
|
|
inode->i_blocks = (inode->i_size + 511) >> 9;
|
|
|
|
/*
|
|
* Now test for possible Rock Ridge extensions which will override
|
|
* some of these numbers in the inode structure.
|
|
*/
|
|
|
|
if (!high_sierra) {
|
|
parse_rock_ridge_inode(de, inode);
|
|
/* if we want uid/gid set, override the rock ridge setting */
|
|
if (sbi->s_uid_set)
|
|
inode->i_uid = sbi->s_uid;
|
|
if (sbi->s_gid_set)
|
|
inode->i_gid = sbi->s_gid;
|
|
}
|
|
/* Now set final access rights if overriding rock ridge setting */
|
|
if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
|
|
sbi->s_dmode != ISOFS_INVALID_MODE)
|
|
inode->i_mode = S_IFDIR | sbi->s_dmode;
|
|
if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
|
|
sbi->s_fmode != ISOFS_INVALID_MODE)
|
|
inode->i_mode = S_IFREG | sbi->s_fmode;
|
|
|
|
/* Install the inode operations vector */
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_fop = &generic_ro_fops;
|
|
switch (ei->i_file_format) {
|
|
#ifdef CONFIG_ZISOFS
|
|
case isofs_file_compressed:
|
|
inode->i_data.a_ops = &zisofs_aops;
|
|
break;
|
|
#endif
|
|
default:
|
|
inode->i_data.a_ops = &isofs_aops;
|
|
break;
|
|
}
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &isofs_dir_inode_operations;
|
|
inode->i_fop = &isofs_dir_operations;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode->i_data.a_ops = &isofs_symlink_aops;
|
|
} else
|
|
/* XXX - parse_rock_ridge_inode() had already set i_rdev. */
|
|
init_special_inode(inode, inode->i_mode, inode->i_rdev);
|
|
|
|
ret = 0;
|
|
out:
|
|
kfree(tmpde);
|
|
if (bh)
|
|
brelse(bh);
|
|
return ret;
|
|
|
|
out_badread:
|
|
printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
|
|
fail:
|
|
goto out;
|
|
}
|
|
|
|
struct isofs_iget5_callback_data {
|
|
unsigned long block;
|
|
unsigned long offset;
|
|
};
|
|
|
|
static int isofs_iget5_test(struct inode *ino, void *data)
|
|
{
|
|
struct iso_inode_info *i = ISOFS_I(ino);
|
|
struct isofs_iget5_callback_data *d =
|
|
(struct isofs_iget5_callback_data*)data;
|
|
return (i->i_iget5_block == d->block)
|
|
&& (i->i_iget5_offset == d->offset);
|
|
}
|
|
|
|
static int isofs_iget5_set(struct inode *ino, void *data)
|
|
{
|
|
struct iso_inode_info *i = ISOFS_I(ino);
|
|
struct isofs_iget5_callback_data *d =
|
|
(struct isofs_iget5_callback_data*)data;
|
|
i->i_iget5_block = d->block;
|
|
i->i_iget5_offset = d->offset;
|
|
return 0;
|
|
}
|
|
|
|
/* Store, in the inode's containing structure, the block and block
|
|
* offset that point to the underlying meta-data for the inode. The
|
|
* code below is otherwise similar to the iget() code in
|
|
* include/linux/fs.h */
|
|
struct inode *isofs_iget(struct super_block *sb,
|
|
unsigned long block,
|
|
unsigned long offset)
|
|
{
|
|
unsigned long hashval;
|
|
struct inode *inode;
|
|
struct isofs_iget5_callback_data data;
|
|
long ret;
|
|
|
|
if (offset >= 1ul << sb->s_blocksize_bits)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
data.block = block;
|
|
data.offset = offset;
|
|
|
|
hashval = (block << sb->s_blocksize_bits) | offset;
|
|
|
|
inode = iget5_locked(sb, hashval, &isofs_iget5_test,
|
|
&isofs_iget5_set, &data);
|
|
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
ret = isofs_read_inode(inode);
|
|
if (ret < 0) {
|
|
iget_failed(inode);
|
|
inode = ERR_PTR(ret);
|
|
} else {
|
|
unlock_new_inode(inode);
|
|
}
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
static struct dentry *isofs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
/* We don't support read-write mounts */
|
|
if (!(flags & MS_RDONLY))
|
|
return ERR_PTR(-EACCES);
|
|
return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type iso9660_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "iso9660",
|
|
.mount = isofs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("iso9660");
|
|
MODULE_ALIAS("iso9660");
|
|
|
|
static int __init init_iso9660_fs(void)
|
|
{
|
|
int err = init_inodecache();
|
|
if (err)
|
|
goto out;
|
|
#ifdef CONFIG_ZISOFS
|
|
err = zisofs_init();
|
|
if (err)
|
|
goto out1;
|
|
#endif
|
|
err = register_filesystem(&iso9660_fs_type);
|
|
if (err)
|
|
goto out2;
|
|
return 0;
|
|
out2:
|
|
#ifdef CONFIG_ZISOFS
|
|
zisofs_cleanup();
|
|
out1:
|
|
#endif
|
|
destroy_inodecache();
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_iso9660_fs(void)
|
|
{
|
|
unregister_filesystem(&iso9660_fs_type);
|
|
#ifdef CONFIG_ZISOFS
|
|
zisofs_cleanup();
|
|
#endif
|
|
destroy_inodecache();
|
|
}
|
|
|
|
module_init(init_iso9660_fs)
|
|
module_exit(exit_iso9660_fs)
|
|
MODULE_LICENSE("GPL");
|