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/*
* ext2_block_move.c --- ext2resizer block mover
*
* Copyright (C) 1997 Theodore Ts'o
*
* %Begin-Header%
* All rights reserved.
* %End-Header%
*/
#include "resize2fs.h"
struct process_block_struct {
ino_t ino;
struct ext2_inode * inode;
ext2_extent bmap;
errcode_t error;
int is_dir;
int flags;
};
static int process_block(ext2_filsys fs, blk_t *block_nr,
int blockcnt, blk_t ref_block,
int ref_offset, void *priv_data)
{
struct process_block_struct *pb;
errcode_t retval;
blk_t block, new_block;
int ret = 0;
pb = (struct process_block_struct *) priv_data;
block = *block_nr;
new_block = ext2fs_extent_translate(pb->bmap, block);
if (new_block) {
*block_nr = new_block;
ret |= BLOCK_CHANGED;
#ifdef RESIZE2FS_DEBUG
if (pb->flags & RESIZE_DEBUG_BMOVE)
printf("ino=%ld, blockcnt=%d, %u->%u\n", pb->ino,
blockcnt, block, new_block);
#endif
}
if (pb->is_dir) {
retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
*block_nr, blockcnt);
if (retval) {
pb->error = retval;
ret |= BLOCK_ABORT;
}
}
return ret;
}
errcode_t ext2fs_block_move(ext2_resize_t rfs)
{
ext2_extent bmap;
blk_t blk, old_blk, new_blk;
ext2_filsys fs = rfs->new_fs;
ext2_filsys old_fs = rfs->old_fs;
ino_t ino;
struct ext2_inode inode;
errcode_t retval;
struct process_block_struct pb;
ext2_inode_scan scan = 0;
char *block_buf = 0;
int size, c;
int to_move, moved;
new_blk = fs->super->s_first_data_block;
if (!rfs->itable_buf) {
retval = ext2fs_get_mem(fs->blocksize *
fs->inode_blocks_per_group,
(void **) &rfs->itable_buf);
if (retval)
return retval;
}
retval = ext2fs_create_extent_table(&bmap, 0);
if (retval)
return retval;
/*
* The first step is to figure out where all of the blocks
* will go.
*/
to_move = moved = 0;
for (blk = old_fs->super->s_first_data_block;
blk < old_fs->super->s_blocks_count; blk++) {
if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
continue;
if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
continue;
while (1) {
if (new_blk >= fs->super->s_blocks_count) {
retval = ENOSPC;
goto errout;
}
if (!ext2fs_test_block_bitmap(fs->block_map, new_blk) &&
!ext2fs_test_block_bitmap(rfs->reserve_blocks,
new_blk))
break;
new_blk++;
}
ext2fs_mark_block_bitmap(fs->block_map, new_blk);
ext2fs_add_extent_entry(bmap, blk, new_blk);
to_move++;
}
if (to_move == 0)
return 0;
/*
* Step two is to actually move the blocks
*/
retval = ext2fs_iterate_extent(bmap, 0, 0, 0);
if (retval) goto errout;
if (rfs->progress)
(rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS, 0, to_move);
while (1) {
retval = ext2fs_iterate_extent(bmap, &old_blk, &new_blk, &size);
if (retval) goto errout;
if (!size)
break;
#ifdef RESIZE2FS_DEBUG
if (rfs->flags & RESIZE_DEBUG_BMOVE)
printf("Moving %d blocks %u->%u\n", size,
old_blk, new_blk);
#endif
do {
c = size;
if (c > fs->inode_blocks_per_group)
c = fs->inode_blocks_per_group;
retval = io_channel_read_blk(fs->io, old_blk, c,
rfs->itable_buf);
if (retval) goto errout;
retval = io_channel_write_blk(fs->io, new_blk, c,
rfs->itable_buf);
if (retval) goto errout;
size -= c;
new_blk += c;
old_blk += c;
moved += c;
io_channel_flush(fs->io);
if (rfs->progress)
(rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
moved, to_move);
} while (size > 0);
io_channel_flush(fs->io);
}
/*
* Step 3 is where we update the block pointers
*/
retval = ext2fs_open_inode_scan(old_fs, 0, &scan);
if (retval) goto errout;
pb.error = 0;
pb.bmap = bmap;
pb.flags = rfs->flags;
retval = ext2fs_get_mem(old_fs->blocksize * 3, (void **) &block_buf);
if (retval)
goto errout;
/*
* We're going to initialize the dblist while we're at it.
*/
if (old_fs->dblist) {
ext2fs_free_dblist(old_fs->dblist);
old_fs->dblist = NULL;
}
retval = ext2fs_init_dblist(old_fs, 0);
if (retval)
return retval;
retval = ext2fs_get_next_inode(scan, &ino, &inode);
if (retval) goto errout;
if (rfs->progress)
(rfs->progress)(rfs, E2_RSZ_BLOCK_REF_UPD_PASS,
0, old_fs->super->s_inodes_count);
while (ino) {
if ((inode.i_links_count == 0) ||
!ext2fs_inode_has_valid_blocks(&inode))
goto next;
pb.ino = ino;
pb.inode = &inode;
pb.is_dir = LINUX_S_ISDIR(inode.i_mode);
retval = ext2fs_block_iterate2(old_fs, ino, 0, block_buf,
process_block, &pb);
if (retval)
goto errout;
if (pb.error) {
retval = pb.error;
goto errout;
}
next:
if (rfs->progress)
(rfs->progress)(rfs, E2_RSZ_BLOCK_REF_UPD_PASS,
ino, old_fs->super->s_inodes_count);
retval = ext2fs_get_next_inode(scan, &ino, &inode);
if (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE)
goto next;
}
retval = 0;
errout:
ext2fs_free_extent_table(bmap);
if (scan)
ext2fs_close_inode_scan(scan);
if (block_buf)
ext2fs_free_mem((void **) &block_buf);
return retval;
}
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