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/*
* expand.c --- expand an ext2fs directory
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "ext2_fs.h"
#include "ext2fs.h"
#include "ext2fsP.h"
struct expand_dir_struct {
int done;
int newblocks;
blk64_t goal;
errcode_t err;
ext2_ino_t dir;
};
static int expand_dir_proc(ext2_filsys fs,
blk64_t *blocknr,
e2_blkcnt_t blockcnt,
blk64_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
blk64_t new_blk;
char *block;
errcode_t retval;
if (*blocknr) {
if (blockcnt >= 0)
es->goal = *blocknr;
return 0;
}
if (blockcnt &&
(EXT2FS_B2C(fs, es->goal) == EXT2FS_B2C(fs, es->goal+1)))
new_blk = es->goal+1;
else {
es->goal &= ~EXT2FS_CLUSTER_MASK(fs);
retval = ext2fs_new_block2(fs, es->goal, 0, &new_blk);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
es->newblocks++;
ext2fs_block_alloc_stats2(fs, new_blk, +1);
}
if (blockcnt > 0) {
retval = ext2fs_new_dir_block(fs, 0, 0, &block);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
es->done = 1;
retval = ext2fs_write_dir_block4(fs, new_blk, block, 0,
es->dir);
ext2fs_free_mem(&block);
} else
retval = ext2fs_zero_blocks2(fs, new_blk, 1, NULL, NULL);
if (blockcnt >= 0)
es->goal = new_blk;
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
*blocknr = new_blk;
if (es->done)
return (BLOCK_CHANGED | BLOCK_ABORT);
else
return BLOCK_CHANGED;
}
errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
{
errcode_t retval;
struct expand_dir_struct es;
struct ext2_inode inode;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
if (!fs->block_map)
return EXT2_ET_NO_BLOCK_BITMAP;
retval = ext2fs_check_directory(fs, dir);
if (retval)
return retval;
retval = ext2fs_read_inode(fs, dir, &inode);
if (retval)
return retval;
es.done = 0;
es.err = 0;
es.goal = ext2fs_find_inode_goal(fs, dir, &inode, 0);
es.newblocks = 0;
es.dir = dir;
retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND,
0, expand_dir_proc, &es);
if (retval == EXT2_ET_INLINE_DATA_CANT_ITERATE)
return ext2fs_inline_data_expand(fs, dir);
if (es.err)
return es.err;
if (!es.done)
return EXT2_ET_EXPAND_DIR_ERR;
/*
* Update the size and block count fields in the inode.
*/
retval = ext2fs_read_inode(fs, dir, &inode);
if (retval)
return retval;
inode.i_size += fs->blocksize;
ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
retval = ext2fs_write_inode(fs, dir, &inode);
if (retval)
return retval;
return 0;
}
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