mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 16:31:24 +00:00
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* ext_attr.c --- extended attribute blocks
|
|
*
|
|
* Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
|
|
*
|
|
* Copyright (C) 2002 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "ext2_fs.h"
|
|
#include "ext2_ext_attr.h"
|
|
#include "ext2fs.h"
|
|
|
|
errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
|
|
{
|
|
errcode_t retval;
|
|
|
|
retval = io_channel_read_blk(fs->io, block, 1, buf);
|
|
if (retval)
|
|
return retval;
|
|
#if BB_BIG_ENDIAN
|
|
if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
|
|
EXT2_FLAG_SWAP_BYTES_READ)) != 0)
|
|
ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
|
|
{
|
|
errcode_t retval;
|
|
char *write_buf;
|
|
char *buf = NULL;
|
|
|
|
if (BB_BIG_ENDIAN && ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
|
|
(fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))) {
|
|
retval = ext2fs_get_mem(fs->blocksize, &buf);
|
|
if (retval)
|
|
return retval;
|
|
write_buf = buf;
|
|
ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1);
|
|
} else
|
|
write_buf = (char *) inbuf;
|
|
retval = io_channel_write_blk(fs->io, block, 1, write_buf);
|
|
if (buf)
|
|
ext2fs_free_mem(&buf);
|
|
if (!retval)
|
|
ext2fs_mark_changed(fs);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* This function adjusts the reference count of the EA block.
|
|
*/
|
|
errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
|
|
char *block_buf, int adjust,
|
|
__u32 *newcount)
|
|
{
|
|
errcode_t retval;
|
|
struct ext2_ext_attr_header *header;
|
|
char *buf = 0;
|
|
|
|
if ((blk >= fs->super->s_blocks_count) ||
|
|
(blk < fs->super->s_first_data_block))
|
|
return EXT2_ET_BAD_EA_BLOCK_NUM;
|
|
|
|
if (!block_buf) {
|
|
retval = ext2fs_get_mem(fs->blocksize, &buf);
|
|
if (retval)
|
|
return retval;
|
|
block_buf = buf;
|
|
}
|
|
|
|
retval = ext2fs_read_ext_attr(fs, blk, block_buf);
|
|
if (retval)
|
|
goto errout;
|
|
|
|
header = (struct ext2_ext_attr_header *) block_buf;
|
|
header->h_refcount += adjust;
|
|
if (newcount)
|
|
*newcount = header->h_refcount;
|
|
|
|
retval = ext2fs_write_ext_attr(fs, blk, block_buf);
|
|
if (retval)
|
|
goto errout;
|
|
|
|
errout:
|
|
if (buf)
|
|
ext2fs_free_mem(&buf);
|
|
return retval;
|
|
}
|