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