/* $NetBSD: ext2fs.c,v 1.28 2019/06/24 13:58:24 pgoyette Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* The Mach Operating System project at Carnegie-Mellon University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* Copyright (c) 1990, 1991 Carnegie Mellon University
* All Rights Reserved.
*
* Author: David Golub
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* Stand-alone file reading package for Ext2 file system.
*/
/* #define EXT2FS_DEBUG */
#include <sys/param.h>
#include <sys/time.h>
#include <ufs/ext2fs/ext2fs_dinode.h>
#include <ufs/ext2fs/ext2fs_dir.h>
#include <ufs/ext2fs/ext2fs.h>
#ifdef _STANDALONE
#include <lib/libkern/libkern.h>
#else
#include <string.h>
#endif
#include "stand.h"
#include "ext2fs.h"
#if defined(LIBSA_FS_SINGLECOMPONENT) && !defined(LIBSA_NO_FS_SYMLINK)
#define LIBSA_NO_FS_SYMLINK
#endif
#if defined(LIBSA_NO_TWIDDLE)
#define twiddle()
#endif
#ifndef indp_t
#define indp_t int32_t
#endif
typedef uint32_t ino32_t;
#ifndef FSBTODB
#define FSBTODB(fs, indp) EXT2_FSBTODB(fs, indp)
#endif
/*
* To avoid having a lot of filesystem-block sized buffers lurking (which
* could be 32k) we only keep a few entries of the indirect block map.
* With 8k blocks, 2^8 blocks is ~500k so we reread the indirect block
* ~13 times pulling in a 6M kernel.
* The cache size must be smaller than the smallest filesystem block,
* so LN2_IND_CACHE_SZ <= 9 (UFS2 and 4k blocks).
*/
#define LN2_IND_CACHE_SZ 6
#define IND_CACHE_SZ (1 << LN2_IND_CACHE_SZ)
#define IND_CACHE_MASK (IND_CACHE_SZ - 1)
/*
* In-core open file.
*/
struct file {
off_t f_seekp; /* seek pointer */
struct m_ext2fs *f_fs; /* pointer to super-block */
struct ext2fs_dinode f_di; /* copy of on-disk inode */
uint f_nishift; /* for blocks in indirect block */
indp_t f_ind_cache_block;
indp_t f_ind_cache[IND_CACHE_SZ];
char *f_buf; /* buffer for data block */
size_t f_buf_size; /* size of data block */
daddr_t f_buf_blkno; /* block number of data block */
};
static int read_inode(ino32_t, struct open_file *);
static int block_map(struct open_file *, indp_t, indp_t *);
static int buf_read_file(struct open_file *, char **, size_t *);
static int search_directory(const char *, int, struct open_file *, ino32_t *);
static int read_sblock(struct open_file *, struct m_ext2fs *);
static int read_gdblock(struct open_file *, struct m_ext2fs *);
#ifdef EXT2FS_DEBUG
static void dump_sblock(struct m_ext2fs *);
#endif
/*
* Read a new inode into a file structure.
*/
static int
read_inode(ino32_t inumber, struct open_file *f)
{
struct file *fp = (struct file *)f->f_fsdata;
struct m_ext2fs *fs = fp->f_fs;
char *buf;
size_t rsize;
int rc;
daddr_t inode_sector;
struct ext2fs_dinode *dip;
inode_sector = FSBTODB(fs, ino_to_fsba(fs, inumber));
/*
* Read inode and save it.
*/
buf = fp->f_buf;
twiddle();
rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
inode_sector, fs->e2fs_bsize, buf, &rsize);
if (rc)
return rc;
if (rsize != (size_t)fs->e2fs_bsize)
return EIO;
dip = (struct ext2fs_dinode *)(buf +
EXT2_DINODE_SIZE(fs) * ino_to_fsbo(fs, inumber));
e2fs_iload(dip, &fp->f_di, EXT2_DINODE_SIZE(fs));
/*
* Clear out the old buffers
*/
fp->f_ind_cache_block = ~0;
fp->f_buf_blkno = -1;
return rc;
}
/*
* Given an offset in a file, find the disk block number that
* contains that block.
*/
static int
block_map(struct open_file *f, indp_t file_block, indp_t *disk_block_p)
{
struct file *fp = (struct file *)f->f_fsdata;
struct m_ext2fs *fs = fp->f_fs;
uint level;
indp_t ind_cache;
indp_t ind_block_num;
size_t rsize;
int rc;
indp_t *buf = (void *)fp->f_buf;
/*
* Index structure of an inode:
*
* e2di_blocks[0..EXT2FS_NDADDR-1]
* hold block numbers for blocks
* 0..EXT2FS_NDADDR-1
*
* e2di_blocks[EXT2FS_NDADDR+0]
* block EXT2FS_NDADDR+0 is the single indirect block
* holds block numbers for blocks
* EXT2FS_NDADDR .. EXT2FS_NDADDR + EXT2_NINDIR(fs)-1
*
* e2di_blocks[EXT2FS_NDADDR+1]
* block EXT2FS_NDADDR+1 is the double indirect block
* holds block numbers for INDEX blocks for blocks
* EXT2FS_NDADDR + EXT2_NINDIR(fs) ..
* EXT2FS_NDADDR + EXT2_NINDIR(fs) + EXT2_NINDIR(fs)**2 - 1
*
* e2di_blocks[EXT2FS_NDADDR+2]
* block EXT2FS_NDADDR+2 is the triple indirect block
* holds block numbers for double-indirect
* blocks for blocks
* EXT2FS_NDADDR + EXT2_NINDIR(fs) + EXT2_NINDIR(fs)**2 ..
* EXT2FS_NDADDR + EXT2_NINDIR(fs) + EXT2_NINDIR(fs)**2
* + EXT2_NINDIR(fs)**3 - 1
*/
if (file_block < EXT2FS_NDADDR) {
/* Direct block. */
*disk_block_p = fs2h32(fp->f_di.e2di_blocks[file_block]);
return 0;
}
file_block -= EXT2FS_NDADDR;
ind_cache = file_block >> LN2_IND_CACHE_SZ;
if (ind_cache == fp->f_ind_cache_block) {
*disk_block_p =
fs2h32(fp->f_ind_cache[file_block & IND_CACHE_MASK]);
return 0;
}
for (level = 0;;) {
level += fp->f_nishift;
if (file_block < (indp_t)1 << level)
break;
if (level > EXT2FS_NIADDR * fp->f_nishift)
/* Block number too high */
return EFBIG;
file_block -= (indp_t)1 << level;
}
ind_block_num =
fs2h32(fp->f_di.e2di_blocks[EXT2FS_NDADDR +
(level / fp->f_nishift - 1)]);
for (;;) {
level -= fp->f_nishift;
if (ind_block_num == 0) {
*disk_block_p = 0; /* missing */
return 0;
}
twiddle();
/*
* If we were feeling brave, we could work out the number
* of the disk sector and read a single disk sector instead
* of a filesystem block.
* However we don't do this very often anyway...
*/
rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
FSBTODB(fp->f_fs, ind_block_num), fs->e2fs_bsize,
buf, &rsize);
if (rc)
return rc;
if (rsize != (size_t)fs->e2fs_bsize)
return EIO;
ind_block_num = fs2h32(buf[file_block >> level]);
if (level == 0)
break;
file_block &= (1 << level) - 1;
}
/* Save the part of the block that contains this sector */
memcpy(fp->f_ind_cache, &buf[file_block & ~IND_CACHE_MASK],
IND_CACHE_SZ * sizeof fp->f_ind_cache[0]);
fp->f_ind_cache_block = ind_cache;
*disk_block_p = ind_block_num;
return 0;
}
/*
* Read a portion of a file into an internal buffer.
* Return the location in the buffer and the amount in the buffer.
*/
static int
buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
{
struct file *fp = (struct file *)f->f_fsdata;
struct m_ext2fs *fs = fp->f_fs;
long off;
indp_t file_block;
indp_t disk_block = 0; /* XXX: gcc */
size_t block_size, tsz;
int rc;
off = ext2_blkoff(fs, fp->f_seekp);
file_block = ext2_lblkno(fs, fp->f_seekp);
block_size = fs->e2fs_bsize; /* no fragment */
if (file_block != fp->f_buf_blkno) {
rc = block_map(f, file_block, &disk_block);
if (rc)
return rc;
if (disk_block == 0) {
memset(fp->f_buf, 0, block_size);
fp->f_buf_size = block_size;
} else {
twiddle();
rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
FSBTODB(fs, disk_block),
block_size, fp->f_buf, &fp->f_buf_size);
if (rc)
return rc;
}
fp->f_buf_blkno = file_block;
}
/*
* Return address of byte in buffer corresponding to
* offset, and size of remainder of buffer after that
* byte.
*/
*buf_p = fp->f_buf + off;
*size_p = block_size - off;
/*
* But truncate buffer at end of file.
*/
/* XXX should handle LARGEFILE */
tsz = (size_t)(fp->f_di.e2di_size - fp->f_seekp);
if (*size_p > tsz)
*size_p = tsz;
return 0;
}
/*
* Search a directory for a name and return its
* inode number.
*/
static int
search_directory(const char *name, int length, struct open_file *f,
ino32_t *inumber_p)
{
struct file *fp = (struct file *)f->f_fsdata;
struct ext2fs_direct *dp;
struct ext2fs_direct *edp;
char *buf;
size_t buf_size;
int namlen;
int rc;
fp->f_seekp = 0;
/* XXX should handle LARGEFILE */
while (fp->f_seekp < (off_t)fp->f_di.e2di_size) {
rc = buf_read_file(f, &buf, &buf_size);
if (rc)
return rc;
dp = (struct ext2fs_direct *)buf;
edp = (struct ext2fs_direct *)(buf + buf_size);
for (; dp < edp;
dp = (void *)((char *)dp + fs2h16(dp->e2d_reclen))) {
if (fs2h16(dp->e2d_reclen) <= 0)
break;
if (fs2h32(dp->e2d_ino) == (ino32_t)0)
continue;
namlen = dp->e2d_namlen;
if (namlen == length &&
!memcmp(name, dp->e2d_name, length)) {
/* found entry */
*inumber_p = fs2h32(dp->e2d_ino);
return 0;
}
}
fp->f_seekp += buf_size;
}
return ENOENT;
}
int
read_sblock(struct open_file *f, struct m_ext2fs *fs)
{
static uint8_t sbbuf[SBSIZE];
struct ext2fs ext2fs;
size_t buf_size;
int rc;
rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
SBOFF / DEV_BSIZE, SBSIZE, sbbuf, &buf_size);
if (rc)
return rc;
if (buf_size != SBSIZE)
return EIO;
e2fs_sbload((void *)sbbuf, &ext2fs);
if (ext2fs.e2fs_magic != E2FS_MAGIC)
return EINVAL;
if (ext2fs.e2fs_rev > E2FS_REV1 ||
(ext2fs.e2fs_rev == E2FS_REV1 &&
(ext2fs.e2fs_first_ino != EXT2_FIRSTINO ||
(ext2fs.e2fs_inode_size != 128 && ext2fs.e2fs_inode_size != 256) ||
ext2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP))) {
return ENODEV;
}
e2fs_sbload((void *)sbbuf, &fs->e2fs);
/* compute in-memory m_ext2fs values */
fs->e2fs_ncg =
howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
fs->e2fs.e2fs_bpg);
/* XXX assume hw bsize = 512 */
fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
fs->e2fs_bsize = MINBSIZE << fs->e2fs.e2fs_log_bsize;
fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
fs->e2fs_qbmask = fs->e2fs_bsize - 1;
fs->e2fs_bmask = ~fs->e2fs_qbmask;
fs->e2fs_ngdb =
howmany(fs->e2fs_ncg, fs->e2fs_bsize / sizeof(struct ext2_gd));
fs->e2fs_ipb = fs->e2fs_bsize / ext2fs.e2fs_inode_size;
fs->e2fs_itpg = fs->e2fs.e2fs_ipg / fs->e2fs_ipb;
return 0;
}
int
read_gdblock(struct open_file *f, struct m_ext2fs *fs)
{
struct file *fp = (struct file *)f->f_fsdata;
size_t rsize;
uint gdpb;
int i, rc;
gdpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
for (i = 0; i < fs->e2fs_ngdb; i++) {
rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
FSBTODB(fs, fs->e2fs.e2fs_first_dblock +
1 /* superblock */ + i),
fs->e2fs_bsize, fp->f_buf, &rsize);
if (rc)
return rc;
if (rsize != (size_t)fs->e2fs_bsize)
return EIO;
e2fs_cgload((struct ext2_gd *)fp->f_buf,
&fs->e2fs_gd[i * gdpb],
(i == (fs->e2fs_ngdb - 1)) ?
(fs->e2fs_ncg - gdpb * i) * sizeof(struct ext2_gd):
(size_t)fs->e2fs_bsize);
}
return 0;
}
/*
* Open a file.
*/
__compactcall int
ext2fs_open(const char *path, struct open_file *f)
{
#ifndef LIBSA_FS_SINGLECOMPONENT
const char *cp, *ncp;
int c;
#endif
ino32_t inumber;
struct file *fp;
struct m_ext2fs *fs;
int rc;
#ifndef LIBSA_NO_FS_SYMLINK
ino32_t parent_inumber;
int nlinks = 0;
char namebuf[MAXPATHLEN+1];
char *buf;
#endif
/* allocate file system specific data structure */
fp = alloc(sizeof(struct file));
memset(fp, 0, sizeof(struct file));
f->f_fsdata = (void *)fp;
/* allocate space and read super block */
fs = alloc(sizeof(*fs));
memset(fs, 0, sizeof(*fs));
fp->f_fs = fs;
twiddle();
rc = read_sblock(f, fs);
if (rc)
goto out;
#ifdef EXT2FS_DEBUG
dump_sblock(fs);
#endif
/* alloc a block sized buffer used for all fs transfers */
fp->f_buf = alloc(fs->e2fs_bsize);
/* read group descriptor blocks */
fs->e2fs_gd = alloc(sizeof(struct ext2_gd) * fs->e2fs_ncg);
rc = read_gdblock(f, fs);
if (rc)
goto out;
/*
* Calculate indirect block levels.
*/
{
indp_t mult;
int ln2;
/*
* We note that the number of indirect blocks is always
* a power of 2. This lets us use shifts and masks instead
* of divide and remainder and avoinds pulling in the
* 64bit division routine into the boot code.
*/
mult = EXT2_NINDIR(fs);
#ifdef DEBUG
if (!powerof2(mult)) {
/* Hummm was't a power of 2 */
rc = EINVAL;
goto out;
}
#endif
for (ln2 = 0; mult != 1; ln2++)
mult >>= 1;
fp->f_nishift = ln2;
}
inumber = EXT2_ROOTINO;
if ((rc = read_inode(inumber, f)) != 0)
goto out;
#ifndef LIBSA_FS_SINGLECOMPONENT
cp = path;
while (*cp) {
/*
* Remove extra separators
*/
while (*cp == '/')
cp++;
if (*cp == '\0')
break;
/*
* Check that current node is a directory.
*/
if ((fp->f_di.e2di_mode & EXT2_IFMT) != EXT2_IFDIR) {
rc = ENOTDIR;
goto out;
}
/*
* Get next component of path name.
*/
ncp = cp;
while ((c = *cp) != '\0' && c != '/')
cp++;
/*
* Look up component in current directory.
* Save directory inumber in case we find a
* symbolic link.
*/
#ifndef LIBSA_NO_FS_SYMLINK
parent_inumber = inumber;
#endif
rc = search_directory(ncp, cp - ncp, f, &inumber);
if (rc)
goto out;
/*
* Open next component.
*/
if ((rc = read_inode(inumber, f)) != 0)
goto out;
#ifndef LIBSA_NO_FS_SYMLINK
/*
* Check for symbolic link.
*/
if ((fp->f_di.e2di_mode & EXT2_IFMT) == EXT2_IFLNK) {
/* XXX should handle LARGEFILE */
size_t link_len = fp->f_di.e2di_size;
size_t len;
len = strlen(cp);
if (link_len + len > MAXPATHLEN ||
++nlinks > MAXSYMLINKS) {
rc = ENOENT;
goto out;
}
memmove(&namebuf[link_len], cp, len + 1);
if (link_len < EXT2_MAXSYMLINKLEN) {
memcpy(namebuf, fp->f_di.e2di_blocks, link_len);
} else {
/*
* Read file for symbolic link
*/
size_t buf_size;
indp_t disk_block;
buf = fp->f_buf;
rc = block_map(f, (indp_t)0, &disk_block);
if (rc)
goto out;
twiddle();
rc = DEV_STRATEGY(f->f_dev)(f->f_devdata,
F_READ, FSBTODB(fs, disk_block),
fs->e2fs_bsize, buf, &buf_size);
if (rc)
goto out;
memcpy(namebuf, buf, link_len);
}
/*
* If relative pathname, restart at parent directory.
* If absolute pathname, restart at root.
*/
cp = namebuf;
if (*cp != '/')
inumber = parent_inumber;
else
inumber = (ino32_t)EXT2_ROOTINO;
if ((rc = read_inode(inumber, f)) != 0)
goto out;
}
#endif /* !LIBSA_NO_FS_SYMLINK */
}
/*
* Found terminal component.
*/
rc = 0;
#else /* !LIBSA_FS_SINGLECOMPONENT */
/* look up component in the current (root) directory */
rc = search_directory(path, strlen(path), f, &inumber);
if (rc)
goto out;
/* open it */
rc = read_inode(inumber, f);
#endif /* !LIBSA_FS_SINGLECOMPONENT */
fp->f_seekp = 0; /* reset seek pointer */
out:
if (rc)
ext2fs_close(f);
else
fsmod = "ufs/ext2fs";
return rc;
}
__compactcall int
ext2fs_close(struct open_file *f)
{
struct file *fp = (struct file *)f->f_fsdata;
f->f_fsdata = NULL;
if (fp == NULL)
return 0;
if (fp->f_fs->e2fs_gd)
dealloc(fp->f_fs->e2fs_gd,
sizeof(struct ext2_gd) * fp->f_fs->e2fs_ncg);
if (fp->f_buf)
dealloc(fp->f_buf, fp->f_fs->e2fs_bsize);
dealloc(fp->f_fs, sizeof(*fp->f_fs));
dealloc(fp, sizeof(struct file));
return 0;
}
/*
* Copy a portion of a file into kernel memory.
* Cross block boundaries when necessary.
*/
__compactcall int
ext2fs_read(struct open_file *f, void *start, size_t size, size_t *resid)
{
struct file *fp = (struct file *)f->f_fsdata;
size_t csize;
char *buf;
size_t buf_size;
int rc = 0;
char *addr = start;
while (size != 0) {
/* XXX should handle LARGEFILE */
if (fp->f_seekp >= (off_t)fp->f_di.e2di_size)
break;
rc = buf_read_file(f, &buf, &buf_size);
if (rc)
break;
csize = size;
if (csize > buf_size)
csize = buf_size;
memcpy(addr, buf, csize);
fp->f_seekp += csize;
addr += csize;
size -= csize;
}
if (resid)
*resid = size;
return rc;
}
/*
* Not implemented.
*/
#ifndef LIBSA_NO_FS_WRITE
__compactcall int
ext2fs_write(struct open_file *f, void *start, size_t size, size_t *resid)
{
return EROFS;
}
#endif /* !LIBSA_NO_FS_WRITE */
#ifndef LIBSA_NO_FS_SEEK
__compactcall off_t
ext2fs_seek(struct open_file *f, off_t offset, int where)
{
struct file *fp = (struct file *)f->f_fsdata;
switch (where) {
case SEEK_SET:
fp->f_seekp = offset;
break;
case SEEK_CUR:
fp->f_seekp += offset;
break;
case SEEK_END:
/* XXX should handle LARGEFILE */
fp->f_seekp = fp->f_di.e2di_size - offset;
break;
default:
return -1;
}
return fp->f_seekp;
}
#endif /* !LIBSA_NO_FS_SEEK */
__compactcall int
ext2fs_stat(struct open_file *f, struct stat *sb)
{
struct file *fp = (struct file *)f->f_fsdata;
/* only important stuff */
memset(sb, 0, sizeof *sb);
sb->st_mode = fp->f_di.e2di_mode;
sb->st_uid = fp->f_di.e2di_uid;
sb->st_gid = fp->f_di.e2di_gid;
/* XXX should handle LARGEFILE */
sb->st_size = fp->f_di.e2di_size;
return 0;
}
#if defined(LIBSA_ENABLE_LS_OP)
#include "ls.h"
static const char *const typestr[] = {
"unknown",
"REG",
"DIR",
"CHR",
"BLK",
"FIFO",
"SOCK",
"LNK"
};
__compactcall void
ext2fs_ls(struct open_file *f, const char *pattern)
{
struct file *fp = (struct file *)f->f_fsdata;
size_t block_size = fp->f_fs->e2fs_bsize;
char *buf;
size_t buf_size;
lsentry_t *names = NULL;
fp->f_seekp = 0;
while (fp->f_seekp < (off_t)fp->f_di.e2di_size) {
struct ext2fs_direct *dp, *edp;
int rc = buf_read_file(f, &buf, &buf_size);
if (rc)
goto out;
if (buf_size != block_size || buf_size == 0)
goto out;
dp = (struct ext2fs_direct *)buf;
edp = (struct ext2fs_direct *)(buf + buf_size);
for (; dp < edp;
dp = (void *)((char *)dp + fs2h16(dp->e2d_reclen))) {
const char *t;
if (fs2h16(dp->e2d_reclen) <= 0)
goto out;
if (fs2h32(dp->e2d_ino) == 0)
continue;
if (dp->e2d_type >= NELEM(typestr) ||
!(t = typestr[dp->e2d_type])) {
/*
* This does not handle "old"
* filesystems properly. On little
* endian machines, we get a bogus
* type name if the namlen matches a
* valid type identifier. We could
* check if we read namlen "0" and
* handle this case specially, if
* there were a pressing need...
*/
printf("bad dir entry\n");
goto out;
}
lsadd(&names, pattern, dp->e2d_name,
strlen(dp->e2d_name), fs2h32(dp->e2d_ino), t);
}
fp->f_seekp += buf_size;
}
lsprint(names);
out: lsfree(names);
}
#endif
/*
* byte swap functions for big endian machines
* (ext2fs is always little endian)
*
* XXX: We should use src/sys/ufs/ext2fs/ext2fs_bswap.c
*/
/* These functions are only needed if native byte order is not big endian */
#if BYTE_ORDER == BIG_ENDIAN
void
e2fs_sb_bswap(struct ext2fs *old, struct ext2fs *new)
{
/* preserve unused fields */
memcpy(new, old, sizeof(struct ext2fs));
new->e2fs_icount = bswap32(old->e2fs_icount);
new->e2fs_bcount = bswap32(old->e2fs_bcount);
new->e2fs_rbcount = bswap32(old->e2fs_rbcount);
new->e2fs_fbcount = bswap32(old->e2fs_fbcount);
new->e2fs_ficount = bswap32(old->e2fs_ficount);
new->e2fs_first_dblock = bswap32(old->e2fs_first_dblock);
new->e2fs_log_bsize = bswap32(old->e2fs_log_bsize);
new->e2fs_fsize = bswap32(old->e2fs_fsize);
new->e2fs_bpg = bswap32(old->e2fs_bpg);
new->e2fs_fpg = bswap32(old->e2fs_fpg);
new->e2fs_ipg = bswap32(old->e2fs_ipg);
new->e2fs_mtime = bswap32(old->e2fs_mtime);
new->e2fs_wtime = bswap32(old->e2fs_wtime);
new->e2fs_mnt_count = bswap16(old->e2fs_mnt_count);
new->e2fs_max_mnt_count = bswap16(old->e2fs_max_mnt_count);
new->e2fs_magic = bswap16(old->e2fs_magic);
new->e2fs_state = bswap16(old->e2fs_state);
new->e2fs_beh = bswap16(old->e2fs_beh);
new->e2fs_minrev = bswap16(old->e2fs_minrev);
new->e2fs_lastfsck = bswap32(old->e2fs_lastfsck);
new->e2fs_fsckintv = bswap32(old->e2fs_fsckintv);
new->e2fs_creator = bswap32(old->e2fs_creator);
new->e2fs_rev = bswap32(old->e2fs_rev);
new->e2fs_ruid = bswap16(old->e2fs_ruid);
new->e2fs_rgid = bswap16(old->e2fs_rgid);
new->e2fs_first_ino = bswap32(old->e2fs_first_ino);
new->e2fs_inode_size = bswap16(old->e2fs_inode_size);
new->e2fs_block_group_nr = bswap16(old->e2fs_block_group_nr);
new->e2fs_features_compat = bswap32(old->e2fs_features_compat);
new->e2fs_features_incompat = bswap32(old->e2fs_features_incompat);
new->e2fs_features_rocompat = bswap32(old->e2fs_features_rocompat);
new->e2fs_algo = bswap32(old->e2fs_algo);
new->e2fs_reserved_ngdb = bswap16(old->e2fs_reserved_ngdb);
}
void e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new,
size_t isize)
{
/* preserve non-swapped and unused fields */
memcpy(new, old, isize);
/* swap what needs to be swapped */
new->e2di_mode = bswap16(old->e2di_mode);
new->e2di_uid = bswap16(old->e2di_uid);
new->e2di_gid = bswap16(old->e2di_gid);
new->e2di_nlink = bswap16(old->e2di_nlink);
new->e2di_size = bswap32(old->e2di_size);
new->e2di_atime = bswap32(old->e2di_atime);
new->e2di_ctime = bswap32(old->e2di_ctime);
new->e2di_mtime = bswap32(old->e2di_mtime);
new->e2di_dtime = bswap32(old->e2di_dtime);
new->e2di_nblock = bswap32(old->e2di_nblock);
new->e2di_flags = bswap32(old->e2di_flags);
new->e2di_version = bswap32(old->e2di_version);
new->e2di_gen = bswap32(old->e2di_gen);
new->e2di_facl = bswap32(old->e2di_facl);
new->e2di_size_high = bswap32(old->e2di_size_high);
new->e2di_nblock_high = bswap16(old->e2di_nblock_high);
new->e2di_facl_high = bswap16(old->e2di_facl_high);
new->e2di_uid_high = bswap16(old->e2di_uid_high);
new->e2di_gid_high = bswap16(old->e2di_gid_high);
new->e2di_checksum_low = bswap16(old->e2di_checksum_low);
/*
* Following fields are only supported for inode sizes bigger
* than the old ext2 one
*/
if (isize == EXT2_REV0_DINODE_SIZE)
return;
new->e2di_extra_isize = bswap16(old->e2di_extra_isize);
new->e2di_checksum_high = bswap16(old->e2di_checksum_high);
/* Following fields are ext4, might not be actually present */
if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize))
new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra);
if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize))
new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra);
if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize))
new->e2di_atime_extra = bswap32(old->e2di_atime_extra);
if (EXT2_DINODE_FITS(new, e2di_crtime, isize))
new->e2di_crtime = bswap32(old->e2di_crtime);
if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize))
new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra);
if (EXT2_DINODE_FITS(new, e2di_version_high, isize))
new->e2di_version_high = bswap32(old->e2di_version_high);
if (EXT2_DINODE_FITS(new, e2di_projid, isize))
new->e2di_projid = bswap32(old->e2di_projid);
}
#endif
#ifdef EXT2FS_DEBUG
void
dump_sblock(struct m_ext2fs *fs)
{
printf("fs->e2fs.e2fs_bcount = %u\n", fs->e2fs.e2fs_bcount);
printf("fs->e2fs.e2fs_first_dblock = %u\n", fs->e2fs.e2fs_first_dblock);
printf("fs->e2fs.e2fs_log_bsize = %u\n", fs->e2fs.e2fs_log_bsize);
printf("fs->e2fs.e2fs_bpg = %u\n", fs->e2fs.e2fs_bpg);
printf("fs->e2fs.e2fs_ipg = %u\n", fs->e2fs.e2fs_ipg);
printf("fs->e2fs.e2fs_magic = 0x%x\n", fs->e2fs.e2fs_magic);
printf("fs->e2fs.e2fs_rev = %u\n", fs->e2fs.e2fs_rev);
if (fs->e2fs.e2fs_rev == E2FS_REV1) {
printf("fs->e2fs.e2fs_first_ino = %u\n",
fs->e2fs.e2fs_first_ino);
printf("fs->e2fs.e2fs_inode_size = %u\n",
fs->e2fs.e2fs_inode_size);
printf("fs->e2fs.e2fs_features_compat = %u\n",
fs->e2fs.e2fs_features_compat);
printf("fs->e2fs.e2fs_features_incompat = %u\n",
fs->e2fs.e2fs_features_incompat);
printf("fs->e2fs.e2fs_features_rocompat = %u\n",
fs->e2fs.e2fs_features_rocompat);
printf("fs->e2fs.e2fs_reserved_ngdb = %u\n",
fs->e2fs.e2fs_reserved_ngdb);
}
printf("fs->e2fs_bsize = %u\n", fs->e2fs_bsize);
printf("fs->e2fs_fsbtodb = %u\n", fs->e2fs_fsbtodb);
printf("fs->e2fs_ncg = %u\n", fs->e2fs_ncg);
printf("fs->e2fs_ngdb = %u\n", fs->e2fs_ngdb);
printf("fs->e2fs_ipb = %u\n", fs->e2fs_ipb);
printf("fs->e2fs_itpg = %u\n", fs->e2fs_itpg);
}
#endif