mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 16:31:24 +00:00
156 lines
3.5 KiB
C
156 lines
3.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* bmove.c --- Move blocks around to make way for a particular
|
|
* filesystem structure.
|
|
*
|
|
* Copyright (C) 1997 Theodore Ts'o. This file may be redistributed
|
|
* under the terms of the GNU Public License.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#if HAVE_SYS_TYPES_H
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
#include "ext2_fs.h"
|
|
#include "ext2fsP.h"
|
|
|
|
struct process_block_struct {
|
|
ext2_ino_t ino;
|
|
struct ext2_inode * inode;
|
|
ext2fs_block_bitmap reserve;
|
|
ext2fs_block_bitmap alloc_map;
|
|
errcode_t error;
|
|
char *buf;
|
|
int add_dir;
|
|
int flags;
|
|
};
|
|
|
|
static int process_block(ext2_filsys fs, blk_t *block_nr,
|
|
e2_blkcnt_t blockcnt, blk_t ref_block,
|
|
int ref_offset, void *priv_data)
|
|
{
|
|
struct process_block_struct *pb;
|
|
errcode_t retval;
|
|
int ret;
|
|
blk_t block, orig;
|
|
|
|
pb = (struct process_block_struct *) priv_data;
|
|
block = orig = *block_nr;
|
|
ret = 0;
|
|
|
|
/*
|
|
* Let's see if this is one which we need to relocate
|
|
*/
|
|
if (ext2fs_test_block_bitmap(pb->reserve, block)) {
|
|
do {
|
|
if (++block >= fs->super->s_blocks_count)
|
|
block = fs->super->s_first_data_block;
|
|
if (block == orig) {
|
|
pb->error = EXT2_ET_BLOCK_ALLOC_FAIL;
|
|
return BLOCK_ABORT;
|
|
}
|
|
} while (ext2fs_test_block_bitmap(pb->reserve, block) ||
|
|
ext2fs_test_block_bitmap(pb->alloc_map, block));
|
|
|
|
retval = io_channel_read_blk(fs->io, orig, 1, pb->buf);
|
|
if (retval) {
|
|
pb->error = retval;
|
|
return BLOCK_ABORT;
|
|
}
|
|
retval = io_channel_write_blk(fs->io, block, 1, pb->buf);
|
|
if (retval) {
|
|
pb->error = retval;
|
|
return BLOCK_ABORT;
|
|
}
|
|
*block_nr = block;
|
|
ext2fs_mark_block_bitmap(pb->alloc_map, block);
|
|
ret = BLOCK_CHANGED;
|
|
if (pb->flags & EXT2_BMOVE_DEBUG)
|
|
printf("ino=%ld, blockcnt=%lld, %d->%d\n", pb->ino,
|
|
blockcnt, orig, block);
|
|
}
|
|
if (pb->add_dir) {
|
|
retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
|
|
block, (int) blockcnt);
|
|
if (retval) {
|
|
pb->error = retval;
|
|
ret |= BLOCK_ABORT;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
errcode_t ext2fs_move_blocks(ext2_filsys fs,
|
|
ext2fs_block_bitmap reserve,
|
|
ext2fs_block_bitmap alloc_map,
|
|
int flags)
|
|
{
|
|
ext2_ino_t ino;
|
|
struct ext2_inode inode;
|
|
errcode_t retval;
|
|
struct process_block_struct pb;
|
|
ext2_inode_scan scan;
|
|
char *block_buf;
|
|
|
|
retval = ext2fs_open_inode_scan(fs, 0, &scan);
|
|
if (retval)
|
|
return retval;
|
|
|
|
pb.reserve = reserve;
|
|
pb.error = 0;
|
|
pb.alloc_map = alloc_map ? alloc_map : fs->block_map;
|
|
pb.flags = flags;
|
|
|
|
retval = ext2fs_get_mem(fs->blocksize * 4, &block_buf);
|
|
if (retval)
|
|
return retval;
|
|
pb.buf = block_buf + fs->blocksize * 3;
|
|
|
|
/*
|
|
* If GET_DBLIST is set in the flags field, then we should
|
|
* gather directory block information while we're doing the
|
|
* block move.
|
|
*/
|
|
if (flags & EXT2_BMOVE_GET_DBLIST) {
|
|
ext2fs_free_dblist(fs->dblist);
|
|
fs->dblist = NULL;
|
|
retval = ext2fs_init_dblist(fs, 0);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
retval = ext2fs_get_next_inode(scan, &ino, &inode);
|
|
if (retval)
|
|
return retval;
|
|
|
|
while (ino) {
|
|
if ((inode.i_links_count == 0) ||
|
|
!ext2fs_inode_has_valid_blocks(&inode))
|
|
goto next;
|
|
|
|
pb.ino = ino;
|
|
pb.inode = &inode;
|
|
|
|
pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) &&
|
|
flags & EXT2_BMOVE_GET_DBLIST);
|
|
|
|
retval = ext2fs_block_iterate2(fs, ino, 0, block_buf,
|
|
process_block, &pb);
|
|
if (retval)
|
|
return retval;
|
|
if (pb.error)
|
|
return pb.error;
|
|
|
|
next:
|
|
retval = ext2fs_get_next_inode(scan, &ino, &inode);
|
|
if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
|
|
goto next;
|
|
}
|
|
return 0;
|
|
}
|