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Add cleaner ext2 filesystem implementation

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Signed-off-by: Laurent Vivier <Laurent@vivier.eu>



git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@627 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Laurent Vivier
2009-11-22 09:47:08 +00:00
parent d2cc5db789
commit 26c129730b
21 changed files with 1381 additions and 2 deletions
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1
fs/build.xml
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@@ -9,5 +9,6 @@
<include href="hfs/build.xml"/>
<include href="hfsplus/build.xml"/>
<include href="iso9660/build.xml"/>
<include href="ext2/build.xml"/>
</build>

14
fs/ext2/build.xml Normal file
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@@ -0,0 +1,14 @@
<build>
<library name="fs" type="static" target="target">
<object source="ext2_close.c" condition="EXT2"/>
<object source="ext2_closedir.c" condition="EXT2"/>
<object source="ext2_fs.c" condition="EXT2"/>
<object source="ext2_lseek.c" condition="EXT2"/>
<object source="ext2_mount.c" condition="EXT2"/>
<object source="ext2_open.c" condition="EXT2"/>
<object source="ext2_opendir.c" condition="EXT2"/>
<object source="ext2_read.c" condition="EXT2"/>
<object source="ext2_readdir.c" condition="EXT2"/>
<object source="ext2_utils.c" condition="EXT2"/>
</library>
</build>

33
fs/ext2/ext2.h Normal file
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@@ -0,0 +1,33 @@
/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#ifndef __EXT2_H__
#define __EXT2_H__
#include "ext2_fs.h"
typedef struct ext2_VOLUME {
int fd;
struct ext2_super_block *super;
unsigned int current;
char *buffer;
} ext2_VOLUME;
typedef struct ext2_DIR {
ext2_VOLUME *volume;
struct ext2_inode *inode;
off_t index;
} ext2_DIR;
typedef struct ext2_FILE {
ext2_VOLUME *volume;
struct ext2_inode *inode;
off_t offset;
char *path;
} ext2_FILE;
#endif /* __LIBEXT2_H__ */

18
fs/ext2/ext2_close.c Normal file
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@@ -0,0 +1,18 @@
/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
void ext2_close(ext2_FILE *file)
{
if (file == NULL)
return;
free(file->inode);
free(file->path);
free(file);
}

18
fs/ext2/ext2_closedir.c Normal file
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@@ -0,0 +1,18 @@
/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2.h"
void ext2_closedir(ext2_DIR *dir)
{
if (dir == NULL)
return;
free(dir->inode);
free(dir);
}

96
fs/ext2/ext2_fs.c Normal file
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@@ -0,0 +1,96 @@
/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2_utils.h"
#include "openbios/fs.h"
static void
umount( fs_ops_t *fs )
{
ext2_VOLUME *volume = (ext2_VOLUME *)fs->fs_data;
ext2_umount( volume );
}
static file_desc_t *
open_path( fs_ops_t *fs, const char *path )
{
ext2_VOLUME *volume = (ext2_VOLUME *)fs->fs_data;
ext2_FILE *file;
file = ext2_open(volume, path);
return (file_desc_t *)file;
}
static char *
get_path( file_desc_t *fd, char *buf, int size )
{
ext2_FILE *file = (ext2_FILE *)fd;
strncpy(buf, file->path, size);
return buf;
}
static int
file_lseek( file_desc_t *fd, off_t offs, int whence )
{
ext2_FILE *file = (ext2_FILE *)fd;
return ext2_lseek(file, offs, whence);
}
static void
file_close( file_desc_t *fd )
{
ext2_FILE *file = (ext2_FILE *)fd;
ext2_close(file);
}
static int
file_read( file_desc_t *fd, void *buf, size_t count )
{
ext2_FILE *file = (ext2_FILE *)fd;
return ext2_read(file, buf, count);
}
static const char *
get_fstype( fs_ops_t *fs)
{
return "EXT2";
}
static const fs_ops_t ext2_ops = {
.close_fs = umount,
.open_path = open_path,
.get_path = get_path,
.close = file_close,
.read = file_read,
.lseek = file_lseek,
.get_fstype = get_fstype,
};
int fs_ext2_open(int fd, fs_ops_t *fs)
{
ext2_VOLUME *volume;
volume = ext2_mount(fd);
if (volume == NULL)
return -1;
*fs = ext2_ops;
fs->fs_data = volume;
return 0;
}

534
fs/ext2/ext2_fs.h Normal file
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@@ -0,0 +1,534 @@
/*
* This file has been copied from
* linux/include/linux/ext2_fs.h
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/include/linux/minix_fs.h
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#ifndef _EXT2_FS_H
#define _EXT2_FS_H
/* from /usr/include/linux/magic.h */
#define EXT2_SUPER_MAGIC 0xEF53
/*
* The second extended filesystem constants/structures
*/
/*
* Define EXT2FS_DEBUG to produce debug messages
*/
#undef EXT2FS_DEBUG
/*
* Define EXT2_RESERVATION to reserve data blocks for expanding files
*/
#define EXT2_DEFAULT_RESERVE_BLOCKS 8
/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
#define EXT2_MAX_RESERVE_BLOCKS 1027
#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
/*
* The second extended file system version
*/
#define EXT2FS_DATE "95/08/09"
#define EXT2FS_VERSION "0.5b"
/*
* Debug code
*/
#ifdef EXT2FS_DEBUG
# define ext2_debug(f, a...) { \
printk ("EXT2-fs DEBUG (%s, %d): %s:", \
__FILE__, __LINE__, __FUNCTION__); \
printk (f, ## a); \
}
#else
# define ext2_debug(f, a...) /**/
#endif
/*
* Special inode numbers
*/
#define EXT2_BAD_INO 1 /* Bad blocks inode */
#define EXT2_ROOT_INO 2 /* Root inode */
#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
/* First non-reserved inode for old ext2 filesystems */
#define EXT2_GOOD_OLD_FIRST_INO 11
/* Assume that user mode programs are passing in an ext2fs superblock, not
* a kernel struct super_block. This will allow us to call the feature-test
* macros from user land. */
#define EXT2_SB(sb) (sb)
/*
* Maximal count of links to a file
*/
#define EXT2_LINK_MAX 32000
/*
* Macro-instructions used to manage several block sizes
*/
#define EXT2_MIN_BLOCK_SIZE 1024
#define EXT2_MAX_BLOCK_SIZE 4096
#define EXT2_MIN_BLOCK_LOG_SIZE 10
# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (uint32_t))
# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
EXT2_GOOD_OLD_INODE_SIZE : \
(s)->s_inode_size)
#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
EXT2_GOOD_OLD_FIRST_INO : \
(s)->s_first_ino)
/*
* Macro-instructions used to manage fragments
*/
#define EXT2_MIN_FRAG_SIZE 1024
#define EXT2_MAX_FRAG_SIZE 4096
#define EXT2_MIN_FRAG_LOG_SIZE 10
# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
/*
* Structure of a blocks group descriptor
*/
struct ext2_group_desc
{
uint32_t bg_block_bitmap; /* Blocks bitmap block */
uint32_t bg_inode_bitmap; /* Inodes bitmap block */
uint32_t bg_inode_table; /* Inodes table block */
uint16_t bg_free_blocks_count; /* Free blocks count */
uint16_t bg_free_inodes_count; /* Free inodes count */
uint16_t bg_used_dirs_count; /* Directories count */
uint16_t bg_pad;
uint32_t bg_reserved[3];
};
/*
* Macro-instructions used to manage group descriptors
*/
# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
/*
* Constants relative to the data blocks
*/
#define EXT2_NDIR_BLOCKS 12
#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
/*
* Inode flags (GETFLAGS/SETFLAGS)
*/
#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
/* Reserved for compression usage... */
#define EXT2_DIRTY_FL FS_DIRTY_FL
#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
/* End compression flags --- maybe not all used */
#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
/*
* ioctl commands
*/
#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
/*
* ioctl commands in 32 bit emulation
*/
#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
/*
* Structure of an inode on the disk
*/
struct ext2_inode {
uint16_t i_mode; /* File mode */
uint16_t i_uid; /* Low 16 bits of Owner Uid */
uint32_t i_size; /* Size in bytes */
uint32_t i_atime; /* Access time */
uint32_t i_ctime; /* Creation time */
uint32_t i_mtime; /* Modification time */
uint32_t i_dtime; /* Deletion Time */
uint16_t i_gid; /* Low 16 bits of Group Id */
uint16_t i_links_count; /* Links count */
uint32_t i_blocks; /* Blocks count */
uint32_t i_flags; /* File flags */
union {
struct {
uint32_t l_i_reserved1;
} linux1;
struct {
uint32_t h_i_translator;
} hurd1;
struct {
uint32_t m_i_reserved1;
} masix1;
} osd1; /* OS dependent 1 */
uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
uint32_t i_generation; /* File version (for NFS) */
uint32_t i_file_acl; /* File ACL */
uint32_t i_dir_acl; /* Directory ACL */
uint32_t i_faddr; /* Fragment address */
union {
struct {
uint8_t l_i_frag; /* Fragment number */
uint8_t l_i_fsize; /* Fragment size */
uint16_t i_pad1;
uint16_t l_i_uid_high; /* these 2 fields */
uint16_t l_i_gid_high; /* were reserved2[0] */
uint32_t l_i_reserved2;
} linux2;
struct {
uint8_t h_i_frag; /* Fragment number */
uint8_t h_i_fsize; /* Fragment size */
uint16_t h_i_mode_high;
uint16_t h_i_uid_high;
uint16_t h_i_gid_high;
uint32_t h_i_author;
} hurd2;
struct {
uint8_t m_i_frag; /* Fragment number */
uint8_t m_i_fsize; /* Fragment size */
uint16_t m_pad1;
uint32_t m_i_reserved2[2];
} masix2;
} osd2; /* OS dependent 2 */
};
#define i_size_high i_dir_acl
#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1 osd1.linux1.l_i_reserved1
#define i_frag osd2.linux2.l_i_frag
#define i_fsize osd2.linux2.l_i_fsize
#define i_uid_low i_uid
#define i_gid_low i_gid
#define i_uid_high osd2.linux2.l_i_uid_high
#define i_gid_high osd2.linux2.l_i_gid_high
#define i_reserved2 osd2.linux2.l_i_reserved2
#endif
#ifdef __hurd__
#define i_translator osd1.hurd1.h_i_translator
#define i_frag osd2.hurd2.h_i_frag;
#define i_fsize osd2.hurd2.h_i_fsize;
#define i_uid_high osd2.hurd2.h_i_uid_high
#define i_gid_high osd2.hurd2.h_i_gid_high
#define i_author osd2.hurd2.h_i_author
#endif
#ifdef __masix__
#define i_reserved1 osd1.masix1.m_i_reserved1
#define i_frag osd2.masix2.m_i_frag
#define i_fsize osd2.masix2.m_i_fsize
#define i_reserved2 osd2.masix2.m_i_reserved2
#endif
/*
* File system states
*/
#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
#define EXT2_ERROR_FS 0x0002 /* Errors detected */
/*
* Mount flags
*/
#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
EXT2_MOUNT_##opt)
/*
* Maximal mount counts between two filesystem checks
*/
#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
/*
* Behaviour when detecting errors
*/
#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
#define EXT2_ERRORS_PANIC 3 /* Panic */
#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
/*
* Structure of the super block
*/
struct ext2_super_block {
uint32_t s_inodes_count; /* Inodes count */
uint32_t s_blocks_count; /* Blocks count */
uint32_t s_r_blocks_count; /* Reserved blocks count */
uint32_t s_free_blocks_count; /* Free blocks count */
uint32_t s_free_inodes_count; /* Free inodes count */
uint32_t s_first_data_block; /* First Data Block */
uint32_t s_log_block_size; /* Block size */
uint32_t s_log_frag_size; /* Fragment size */
uint32_t s_blocks_per_group; /* # Blocks per group */
uint32_t s_frags_per_group; /* # Fragments per group */
uint32_t s_inodes_per_group; /* # Inodes per group */
uint32_t s_mtime; /* Mount time */
uint32_t s_wtime; /* Write time */
uint16_t s_mnt_count; /* Mount count */
uint16_t s_max_mnt_count; /* Maximal mount count */
uint16_t s_magic; /* Magic signature */
uint16_t s_state; /* File system state */
uint16_t s_errors; /* Behaviour when detecting errors */
uint16_t s_minor_rev_level; /* minor revision level */
uint32_t s_lastcheck; /* time of last check */
uint32_t s_checkinterval; /* max. time between checks */
uint32_t s_creator_os; /* OS */
uint32_t s_rev_level; /* Revision level */
uint16_t s_def_resuid; /* Default uid for reserved blocks */
uint16_t s_def_resgid; /* Default gid for reserved blocks */
/*
* These fields are for EXT2_DYNAMIC_REV superblocks only.
*
* Note: the difference between the compatible feature set and
* the incompatible feature set is that if there is a bit set
* in the incompatible feature set that the kernel doesn't
* know about, it should refuse to mount the filesystem.
*
* e2fsck's requirements are more strict; if it doesn't know
* about a feature in either the compatible or incompatible
* feature set, it must abort and not try to meddle with
* things it doesn't understand...
*/
uint32_t s_first_ino; /* First non-reserved inode */
uint16_t s_inode_size; /* size of inode structure */
uint16_t s_block_group_nr; /* block group # of this superblock */
uint32_t s_feature_compat; /* compatible feature set */
uint32_t s_feature_incompat; /* incompatible feature set */
uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
uint8_t s_uuid[16]; /* 128-bit uuid for volume */
char s_volume_name[16]; /* volume name */
char s_last_mounted[64]; /* directory where last mounted */
uint32_t s_algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT2_COMPAT_PREALLOC flag is on.
*/
uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
uint16_t s_padding1;
/*
* Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
*/
uint8_t s_journal_uuid[16]; /* uuid of journal superblock */
uint32_t s_journal_inum; /* inode number of journal file */
uint32_t s_journal_dev; /* device number of journal file */
uint32_t s_last_orphan; /* start of list of inodes to delete */
uint32_t s_hash_seed[4]; /* HTREE hash seed */
uint8_t s_def_hash_version; /* Default hash version to use */
uint8_t s_reserved_char_pad;
uint16_t s_reserved_word_pad;
uint32_t s_default_mount_opts;
uint32_t s_first_meta_bg; /* First metablock block group */
uint32_t s_reserved[190]; /* Padding to the end of the block */
};
/*
* Codes for operating systems
*/
#define EXT2_OS_LINUX 0
#define EXT2_OS_HURD 1
#define EXT2_OS_MASIX 2
#define EXT2_OS_FREEBSD 3
#define EXT2_OS_LITES 4
/*
* Revision levels
*/
#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
#define EXT2_GOOD_OLD_INODE_SIZE 128
/*
* Feature set definitions
*/
#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
#define EXT2_SET_COMPAT_FEATURE(sb,mask) \
EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT2_FEATURE_COMPAT_ANY 0xffffffff
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
EXT2_FEATURE_INCOMPAT_META_BG)
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
/*
* Default values for user and/or group using reserved blocks
*/
#define EXT2_DEF_RESUID 0
#define EXT2_DEF_RESGID 0
/*
* Default mount options
*/
#define EXT2_DEFM_DEBUG 0x0001
#define EXT2_DEFM_BSDGROUPS 0x0002
#define EXT2_DEFM_XATTR_USER 0x0004
#define EXT2_DEFM_ACL 0x0008
#define EXT2_DEFM_UID16 0x0010
/* Not used by ext2, but reserved for use by ext3 */
#define EXT3_DEFM_JMODE 0x0060
#define EXT3_DEFM_JMODE_DATA 0x0020
#define EXT3_DEFM_JMODE_ORDERED 0x0040
#define EXT3_DEFM_JMODE_WBACK 0x0060
/*
* Structure of a directory entry
*/
#define EXT2_NAME_LEN 255
struct ext2_dir_entry {
uint32_t inode; /* Inode number */
uint16_t rec_len; /* Directory entry length */
uint16_t name_len; /* Name length */
char name[EXT2_NAME_LEN]; /* File name */
};
/*
* The new version of the directory entry. Since EXT2 structures are
* stored in intel byte order, and the name_len field could never be
* bigger than 255 chars, it's safe to reclaim the extra byte for the
* file_type field.
*/
struct ext2_dir_entry_2 {
uint32_t inode; /* Inode number */
uint16_t rec_len; /* Directory entry length */
uint8_t name_len; /* Name length */
uint8_t file_type;
char name[EXT2_NAME_LEN]; /* File name */
};
/*
* Ext2 directory file types. Only the low 3 bits are used. The
* other bits are reserved for now.
*/
enum {
EXT2_FT_UNKNOWN,
EXT2_FT_REG_FILE,
EXT2_FT_DIR,
EXT2_FT_CHRDEV,
EXT2_FT_BLKDEV,
EXT2_FT_FIFO,
EXT2_FT_SOCK,
EXT2_FT_SYMLINK,
EXT2_FT_MAX
};
/*
* EXT2_DIR_PAD defines the directory entries boundaries
*
* NOTE: It must be a multiple of 4
*/
#define EXT2_DIR_PAD 4
#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
~EXT2_DIR_ROUND)
#define EXT2_MAX_REC_LEN ((1<<16)-1)
#endif /* _EXT2_FS_H */

38
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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2.h"
int ext2_lseek(ext2_FILE *file, long offset, int whence)
{
long new_offset;
switch(whence)
{
case SEEK_SET:
new_offset = offset;
break;
case SEEK_CUR:
new_offset = file->offset + offset;
break;
case SEEK_END:
new_offset = file->inode->i_size + offset;
break;
default:
return -1;
}
if ( (new_offset < 0) ||
(new_offset > file->inode->i_size) )
return -1;
file->offset = new_offset;
return new_offset;
}

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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2.h"
#include "ext2_utils.h"
#define SB_OFFSET (2)
ext2_VOLUME* ext2_mount(int fd)
{
ext2_VOLUME *volume;
struct ext2_super_block *super;
char *buffer;
super = (struct ext2_super_block*)malloc(sizeof(struct ext2_super_block));
if (super == NULL)
return NULL;
ext2_get_super(fd, super);
if (super->s_magic != EXT2_SUPER_MAGIC) {
free(super);
return NULL;
}
buffer = (char*)malloc(EXT2_BLOCK_SIZE(super));
if (buffer == NULL) {
free(super);
return NULL;
}
volume = (ext2_VOLUME*)malloc(sizeof(ext2_VOLUME));
if (volume == NULL) {
free(super);
free(buffer);
return NULL;
}
volume->buffer = buffer;
volume->fd = fd;
volume->super = super;
volume->current = -1;
ext2_read_block(volume, 0);
return volume;
}
int ext2_umount(ext2_VOLUME* volume)
{
if (volume == NULL)
return -1;
free(volume->super);
free(volume->buffer);
free(volume);
return 0;
}

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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2.h"
#include "ext2_utils.h"
ext2_FILE* ext2_open(ext2_VOLUME *volume, const char* pathname)
{
ext2_FILE *file;
struct ext2_inode *inode;
int ino;
int ret;
ino = ext2_seek_name(volume, pathname);
if (ino == 0)
return NULL;
inode = (struct ext2_inode*)malloc(sizeof(struct ext2_inode));
if (inode == NULL)
return NULL;
ret = ext2_get_inode(volume, ino, inode);
if (ret == -1) {
free(inode);
return NULL;
}
if (S_ISLNK(inode->i_mode)) {
static char buffer[1024];
int i, last = 0;
strcpy(buffer, pathname);
for (i = 0; buffer[i]; i++)
if (buffer[i] == '\\')
last = i;
buffer[last] = '\\';
strcpy(buffer + last + 1, (char*)inode->i_block);
ino = ext2_seek_name((ext2_VOLUME*)volume, buffer);
if (ino == 0) {
free(inode);
return NULL;
}
ret = ext2_get_inode((ext2_VOLUME*)volume, ino, inode);
if (ret == -1) {
free(inode);
return NULL;
}
}
file = (ext2_FILE*)malloc(sizeof(ext2_FILE));
if (file == NULL) {
free(inode);
return NULL;
}
file->volume = volume;
file->inode = inode;
file->offset = 0;
file->path = strdup(pathname);
return file;
}

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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2.h"
#include "ext2_utils.h"
ext2_DIR* ext2_opendir(ext2_VOLUME *volume, const char *name)
{
ext2_DIR* dir;
int ino;
struct ext2_inode *inode;
int ret;
ino = ext2_seek_name(volume, name);
if (ino == 0)
return NULL;
inode = (struct ext2_inode*)malloc(sizeof(struct ext2_inode));
if (inode == NULL)
return NULL;
ret = ext2_get_inode(volume, ino, inode);
if (ret == -1) {
free(inode);
return NULL;
}
if (!S_ISDIR(inode->i_mode)) {
free(inode);
return NULL;
}
dir = (ext2_DIR*)malloc(sizeof(ext2_DIR));
if (dir == NULL) {
free(inode);
return NULL;
}
dir->volume = (ext2_VOLUME*)volume;
dir->inode = inode;
dir->index = 0;
return dir;
}

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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2.h"
#include "ext2_utils.h"
size_t ext2_read(ext2_FILE *file, void *buf, size_t count)
{
int ret;
ret = ext2_read_data(file->volume, file->inode, file->offset,
buf, count);
if (ret == -1)
return -1;
file->offset += ret;
return ret;
}

25
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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2_utils.h"
static struct ext2_dir_entry_2 entry;
struct ext2_dir_entry_2 *ext2_readdir(ext2_DIR *dir)
{
int ret;
ret = ext2_dir_entry(dir->volume, dir->inode, dir->index, &entry);
if (ret == -1)
return NULL;
dir->index = ret;
entry.name[entry.name_len] = 0;
return &entry;
}

315
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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#include "libext2.h"
#include "ext2_utils.h"
#include "openbios/bindings.h"
#include "libc/diskio.h"
#include "libc/byteorder.h"
void ext2_get_super(int fd, struct ext2_super_block *super)
{
seek_io(fd, 2 * 512);
read_io(fd, super, sizeof (*super));
super->s_inodes_count = __le32_to_cpu(super->s_inodes_count);
super->s_blocks_count = __le32_to_cpu(super->s_blocks_count);
super->s_r_blocks_count = __le32_to_cpu(super->s_r_blocks_count);
super->s_free_blocks_count = __le32_to_cpu(super->s_free_blocks_count);
super->s_free_inodes_count = __le32_to_cpu(super->s_free_inodes_count);
super->s_first_data_block = __le32_to_cpu(super->s_first_data_block);
super->s_log_block_size = __le32_to_cpu(super->s_log_block_size);
super->s_log_frag_size = __le32_to_cpu(super->s_log_frag_size);
super->s_blocks_per_group = __le32_to_cpu(super->s_blocks_per_group);
super->s_frags_per_group = __le32_to_cpu(super->s_frags_per_group);
super->s_inodes_per_group = __le32_to_cpu(super->s_inodes_per_group);
super->s_mtime = __le32_to_cpu(super->s_mtime);
super->s_wtime = __le32_to_cpu(super->s_wtime);
super->s_mnt_count = __le16_to_cpu(super->s_mnt_count);
super->s_max_mnt_count = __le16_to_cpu(super->s_max_mnt_count);
super->s_magic = __le16_to_cpu(super->s_magic);
super->s_state = __le16_to_cpu(super->s_state);
super->s_errors = __le16_to_cpu(super->s_errors);
super->s_minor_rev_level = __le16_to_cpu(super->s_minor_rev_level);
super->s_lastcheck = __le32_to_cpu(super->s_lastcheck);
super->s_checkinterval = __le32_to_cpu(super->s_checkinterval);
super->s_creator_os = __le32_to_cpu(super->s_creator_os);
super->s_rev_level = __le32_to_cpu(super->s_rev_level);
super->s_def_resuid = __le16_to_cpu(super->s_def_resuid);
super->s_def_resgid = __le16_to_cpu(super->s_def_resgid);
super->s_first_ino = __le32_to_cpu(super->s_first_ino);
super->s_inode_size = __le16_to_cpu(super->s_inode_size);
super->s_block_group_nr = __le16_to_cpu(super->s_block_group_nr);
super->s_feature_compat = __le32_to_cpu(super->s_feature_compat);
super->s_feature_incompat = __le32_to_cpu(super->s_feature_incompat);
super->s_feature_ro_compat = __le32_to_cpu(super->s_feature_ro_compat);
super->s_algorithm_usage_bitmap =
__le32_to_cpu(super->s_algorithm_usage_bitmap);
super->s_journal_inum = __le32_to_cpu(super->s_journal_inum);
super->s_journal_dev = __le32_to_cpu(super->s_journal_dev);
super->s_last_orphan = __le32_to_cpu(super->s_last_orphan);
super->s_hash_seed[0] = __le32_to_cpu(super->s_hash_seed[0]);
super->s_hash_seed[1] = __le32_to_cpu(super->s_hash_seed[1]);
super->s_hash_seed[2] = __le32_to_cpu(super->s_hash_seed[2]);
super->s_hash_seed[3] = __le32_to_cpu(super->s_hash_seed[3]);
super->s_default_mount_opts =
__le32_to_cpu(super->s_default_mount_opts);
super->s_first_meta_bg = __le32_to_cpu(super->s_first_meta_bg);
}
void ext2_read_block(ext2_VOLUME* volume, unsigned int fsblock)
{
llong offset;
if (fsblock == volume->current)
return;
volume->current = fsblock;
offset = fsblock * EXT2_BLOCK_SIZE(volume->super);
seek_io(volume->fd, offset);
read_io(volume->fd, volume->buffer, EXT2_BLOCK_SIZE(volume->super));
}
void ext2_get_group_desc(ext2_VOLUME* volume,
int group_id, struct ext2_group_desc *gdp)
{
unsigned int block, offset;
struct ext2_group_desc *le_gdp;
block = 1 + volume->super->s_first_data_block;
block += group_id / EXT2_DESC_PER_BLOCK(volume->super);
ext2_read_block(volume, block);
offset = group_id % EXT2_DESC_PER_BLOCK(volume->super);
offset *= sizeof(*gdp);
le_gdp = (struct ext2_group_desc *)(volume->buffer + offset);
gdp->bg_block_bitmap = __le32_to_cpu(le_gdp->bg_block_bitmap);
gdp->bg_inode_bitmap = __le32_to_cpu(le_gdp->bg_inode_bitmap);
gdp->bg_inode_table = __le32_to_cpu(le_gdp->bg_inode_table);
gdp->bg_free_blocks_count = __le16_to_cpu(le_gdp->bg_free_blocks_count);
gdp->bg_free_inodes_count = __le16_to_cpu(le_gdp->bg_free_inodes_count);
gdp->bg_used_dirs_count = __le16_to_cpu(le_gdp->bg_used_dirs_count);
}
int ext2_get_inode(ext2_VOLUME* volume,
unsigned int ino, struct ext2_inode *inode)
{
struct ext2_group_desc desc;
unsigned int block;
unsigned int group_id;
unsigned int offset;
struct ext2_inode *le_inode;
int i;
ino--;
group_id = ino / EXT2_INODES_PER_GROUP(volume->super);
ext2_get_group_desc(volume, group_id, &desc);
ino %= EXT2_INODES_PER_GROUP(volume->super);
block = desc.bg_inode_table;
block += ino / (EXT2_BLOCK_SIZE(volume->super) /
EXT2_INODE_SIZE(volume->super));
ext2_read_block(volume, block);
offset = ino % (EXT2_BLOCK_SIZE(volume->super) /
EXT2_INODE_SIZE(volume->super));
offset *= EXT2_INODE_SIZE(volume->super);
le_inode = (struct ext2_inode *)(volume->buffer + offset);
inode->i_mode = __le16_to_cpu(le_inode->i_mode);
inode->i_uid = __le16_to_cpu(le_inode->i_uid);
inode->i_size = __le32_to_cpu(le_inode->i_size);
inode->i_atime = __le32_to_cpu(le_inode->i_atime);
inode->i_ctime = __le32_to_cpu(le_inode->i_ctime);
inode->i_mtime = __le32_to_cpu(le_inode->i_mtime);
inode->i_dtime = __le32_to_cpu(le_inode->i_dtime);
inode->i_gid = __le16_to_cpu(le_inode->i_gid);
inode->i_links_count = __le16_to_cpu(le_inode->i_links_count);
inode->i_blocks = __le32_to_cpu(le_inode->i_blocks);
inode->i_flags = __le32_to_cpu(le_inode->i_flags);
if (S_ISLNK(inode->i_mode)) {
memcpy(inode->i_block, le_inode->i_block, EXT2_N_BLOCKS * 4);
} else {
for (i = 0; i < EXT2_N_BLOCKS; i++)
inode->i_block[i] = __le32_to_cpu(le_inode->i_block[i]);
}
inode->i_generation = __le32_to_cpu(le_inode->i_generation);
inode->i_file_acl = __le32_to_cpu(le_inode->i_file_acl);
inode->i_dir_acl = __le32_to_cpu(le_inode->i_dir_acl);
inode->i_faddr = __le32_to_cpu(le_inode->i_faddr);
inode->osd2.linux2.l_i_frag = le_inode->osd2.linux2.l_i_frag;
inode->osd2.linux2.l_i_fsize = le_inode->osd2.linux2.l_i_fsize;
inode->osd2.linux2.l_i_uid_high =
__le16_to_cpu(le_inode->osd2.linux2.l_i_uid_high);
inode->osd2.linux2.l_i_gid_high =
__le16_to_cpu(le_inode->osd2.linux2.l_i_gid_high);
return 0;
}
unsigned int ext2_get_block_addr(ext2_VOLUME* volume, struct ext2_inode *inode,
unsigned int logical)
{
unsigned int physical;
unsigned int addr_per_block;
/* direct */
if (logical < EXT2_NDIR_BLOCKS) {
physical = inode->i_block[logical];
return physical;
}
/* indirect */
logical -= EXT2_NDIR_BLOCKS;
addr_per_block = EXT2_ADDR_PER_BLOCK (volume->super);
if (logical < addr_per_block) {
ext2_read_block(volume, inode->i_block[EXT2_IND_BLOCK]);
physical = __le32_to_cpu(((unsigned int *)volume->buffer)[logical]);
return physical;
}
/* double indirect */
logical -= addr_per_block;
if (logical < addr_per_block * addr_per_block) {
ext2_read_block(volume, inode->i_block[EXT2_DIND_BLOCK]);
physical = __le32_to_cpu(((unsigned int *)volume->buffer)
[logical / addr_per_block]);
ext2_read_block(volume, physical);
physical = __le32_to_cpu(((unsigned int *)volume->buffer)
[logical % addr_per_block]);
return physical;
}
/* triple indirect */
logical -= addr_per_block * addr_per_block;
ext2_read_block(volume, inode->i_block[EXT2_DIND_BLOCK]);
physical = __le32_to_cpu(((unsigned int *)volume->buffer)
[logical / (addr_per_block * addr_per_block)]);
ext2_read_block(volume, physical);
logical = logical % (addr_per_block * addr_per_block);
physical = __le32_to_cpu(((unsigned int *)volume->buffer)[logical / addr_per_block]);
ext2_read_block(volume, physical);
physical = __le32_to_cpu(((unsigned int *)volume->buffer)[logical % addr_per_block]);
return physical;
}
int ext2_read_data(ext2_VOLUME* volume, struct ext2_inode *inode,
off_t offset, char *buffer, size_t length)
{
unsigned int logical, physical;
int blocksize = EXT2_BLOCK_SIZE(volume->super);
int shift;
size_t read;
if (offset >= inode->i_size)
return -1;
if (offset + length >= inode->i_size)
length = inode->i_size - offset;
read = 0;
logical = offset / blocksize;
shift = offset % blocksize;
if (shift) {
physical = ext2_get_block_addr(volume, inode, logical);
ext2_read_block(volume, physical);
if (length < blocksize - shift) {
memcpy(buffer, volume->buffer + shift, length);
return length;
}
read += blocksize - shift;
memcpy(buffer, volume->buffer + shift, read);
buffer += read;
length -= read;
logical++;
}
while (length) {
physical = ext2_get_block_addr(volume, inode, logical);
ext2_read_block(volume, physical);
if (length < blocksize) {
memcpy(buffer, volume->buffer, length);
read += length;
return read;
}
memcpy(buffer, volume->buffer, blocksize);
buffer += blocksize;
length -= blocksize;
read += blocksize;
logical++;
}
return read;
}
off_t ext2_dir_entry(ext2_VOLUME *volume, struct ext2_inode *inode,
off_t index, struct ext2_dir_entry_2 *entry)
{
int ret;
ret = ext2_read_data(volume, inode, index,
(char*)entry, sizeof(*entry));
if (ret == -1)
return -1;
entry->inode = __le32_to_cpu(entry->inode);
entry->rec_len = __le16_to_cpu(entry->rec_len);
return index + entry->rec_len;
}
unsigned int ext2_seek_name(ext2_VOLUME *volume, const char *name)
{
struct ext2_inode inode;
int ret;
unsigned int ino;
off_t index;
struct ext2_dir_entry_2 entry;
ino = EXT2_ROOT_INO;
while(1) {
while (*name == '\\')
name++;
if (!*name)
break;
ret = ext2_get_inode(volume, ino, &inode);
if (ret == -1)
return 0;
index = 0;
while (1) {
index = ext2_dir_entry(volume, &inode, index, &entry);
if (index == -1)
return 0;
ret = strncmp(name, entry.name, entry.name_len);
if (ret == 0 &&
(name[entry.name_len] == 0 ||
name[entry.name_len] == '\\')) {
ino = entry.inode;
break;
}
}
name += entry.name_len;
}
return ino;
}

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/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#ifndef __EXT2_UTILS_H__
#define __EXT2_UTILS_H__
#include "ext2_fs.h"
#include "ext2.h"
/* from linux/stat.h */
#define S_IFMT 00170000
#define S_IFSOCK 0140000
#define S_IFLNK 0120000
#define S_IFREG 0100000
#define S_IFBLK 0060000
#define S_IFDIR 0040000
#define S_IFCHR 0020000
#define S_IFIFO 0010000
#define S_ISUID 0004000
#define S_ISGID 0002000
#define S_ISVTX 0001000
#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
#define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
/* utilities */
extern void ext2_get_super(int fd, struct ext2_super_block *super);
extern void ext2_read_block(ext2_VOLUME* volume, unsigned int fsblock);
extern void ext2_get_group_desc(ext2_VOLUME* volume,
int group_id, struct ext2_group_desc *gdp);
extern int ext2_get_inode(ext2_VOLUME* volume,
unsigned int ino, struct ext2_inode *inode);
extern unsigned int ext2_get_block_addr(ext2_VOLUME* volume,
struct ext2_inode *inode,
unsigned int logical);
extern int ext2_read_data(ext2_VOLUME* volume, struct ext2_inode *inode,
off_t offset, char *buffer, size_t length);
extern off_t ext2_dir_entry(ext2_VOLUME *volume, struct ext2_inode *inode,
off_t offset, struct ext2_dir_entry_2 *entry);
extern unsigned int ext2_seek_name(ext2_VOLUME *volume, const char *name);
#endif /* __EXT2_UTILS_H__ */

25
fs/ext2/libext2.h Normal file
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@@ -0,0 +1,25 @@
/*
*
* (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
*
* This file has been copied from EMILE, http://emile.sf.net
*
*/
#ifndef __LIBEXT2_H__
#define __LIBEXT2_H__
#include "openbios/config.h"
#include "ext2.h"
extern ext2_VOLUME* ext2_mount(int fd);
extern int ext2_umount(ext2_VOLUME *volume);
extern ext2_DIR* ext2_opendir(ext2_VOLUME *, const char *name);
extern struct ext2_dir_entry_2* ext2_readdir(ext2_DIR* dir);
extern void ext2_closedir(ext2_DIR *dir);
extern ext2_FILE* ext2_open(ext2_VOLUME *, const char* pathname);
extern size_t ext2_read(ext2_FILE *file, void *buf, size_t count);
extern void ext2_close(ext2_FILE *file);
extern int ext2_lseek(ext2_FILE *file, long offset, int whence);
#endif /* __LIBEXT2_H__ */