Old version of inode reallocator (merged into e2fsprogs fork)
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/*
* bmove.c --- Move blocks around to make way for a particular filesystem structure.
* Adjusted to work correctly with bigalloc.
*
* Copyright (C) 1997 Theodore Ts'o, (C) 2014 Vitaliy Filippov.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include <stdio.h>
#include <string.h>
#include "bmove.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;
int changes;
blk64_t last, last_new;
};
static int process_block(ext2_filsys fs, blk64_t *block_nr,
e2_blkcnt_t blockcnt, blk64_t ref_block,
int ref_offset, void *priv_data)
{
struct process_block_struct *pb;
errcode_t retval;
int ret;
blk64_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_bitmap2(pb->reserve, block)) {
if (block & EXT2FS_CLUSTER_MASK(fs)) {
// This means we've already moved the cluster and just need
// to rewrite numbers of a non-first block in a cluster
if (pb->last == block-1) {
*block_nr = pb->last_new+1;
pb->last++;
pb->changes++;
return BLOCK_CHANGED;
}
return 0;
}
if (blockcnt >= 0 && (pb->ino == EXT2_BAD_INO || pb->ino == EXT2_RESIZE_INO)) {
// We obviously can't move bad blocks; and also the resize inode, because it must be in a predefined location
// But we allow to move extent blocks (blockcnt == -1) and directory index blocks (blockcnt == -2)
pb->error = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
return BLOCK_ABORT;
}
do {
if (++block >= ext2fs_blocks_count(fs->super))
block = fs->super->s_first_data_block;
if (block == orig) {
pb->error = EXT2_ET_BLOCK_ALLOC_FAIL;
return BLOCK_ABORT;
}
} while (ext2fs_test_block_bitmap2(pb->reserve, block) ||
ext2fs_test_block_bitmap2(pb->alloc_map, block));
retval = io_channel_read_blk64(fs->io, orig, EXT2FS_CLUSTER_RATIO(fs), pb->buf);
if (retval) {
pb->error = retval;
return BLOCK_ABORT;
}
retval = io_channel_write_blk64(fs->io, block, EXT2FS_CLUSTER_RATIO(fs), pb->buf);
if (retval) {
pb->error = retval;
return BLOCK_ABORT;
}
*block_nr = block;
pb->last = orig;
pb->last_new = block;
ext2fs_block_alloc_stats2(fs, orig, -1);
ext2fs_block_alloc_stats2(fs, block, +1);
ret = BLOCK_CHANGED;
pb->changes++;
if (pb->flags & EXT2_BMOVE_DEBUG)
printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
(unsigned) pb->ino, blockcnt,
(unsigned long long) orig,
(unsigned long long) block);
}
if (pb->add_dir) {
retval = ext2fs_add_dir_block2(fs->dblist, pb->ino, block, 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_array(3 + EXT2FS_CLUSTER_RATIO(fs), fs->blocksize, &block_buf);
if (retval)
return retval;
pb.buf = block_buf + fs->blocksize * 3;
pb.last = -1;
pb.changes = 0;
/*
* 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) {
if (fs->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_blocks2(fs, &inode))
goto next;
pb.ino = ino;
pb.inode = &inode;
pb.add_dir = (LINUX_S_ISDIR(inode.i_mode) && flags & EXT2_BMOVE_GET_DBLIST);
if ((inode.i_flags & EXT4_INLINE_DATA_FL) && pb.add_dir) {
/* inline data dir; update it too */
retval = ext2fs_add_dir_block2(fs->dblist, ino, 0, 0);
if (retval)
return retval;
}
retval = ext2fs_block_iterate3(fs, ino, 0, block_buf, process_block, &pb);
if (retval)
return retval;
if (pb.error)
return pb.error;
// Adjust journal backup after changing the journal inode
if (ino == EXT2_JOURNAL_INO && pb.changes) {
retval = ext2fs_read_inode(fs, ino, &inode);
if (retval)
return retval;
memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
fs->super->s_jnl_blocks[15] = inode.i_size_high;
fs->super->s_jnl_blocks[16] = inode.i_size;
fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
ext2fs_mark_super_dirty(fs);
}
next:
retval = ext2fs_get_next_inode(scan, &ino, &inode);
if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
goto next;
}
return 0;
}