/* vi: set sw=4 ts=4: */ /* * 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 Public * License. * %End-Header% */ #include <stdio.h> #include <string.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #include "ext2_fs.h" #include "ext2fs.h" struct expand_dir_struct { int done; int newblocks; errcode_t err; }; static int expand_dir_proc(ext2_filsys fs, blk_t *blocknr, e2_blkcnt_t blockcnt, blk_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; blk_t new_blk; static blk_t last_blk = 0; char *block; errcode_t retval; if (*blocknr) { last_blk = *blocknr; return 0; } retval = ext2fs_new_block(fs, last_blk, 0, &new_blk); if (retval) { es->err = retval; return BLOCK_ABORT; } 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_block(fs, new_blk, block); } else { retval = ext2fs_get_mem(fs->blocksize, &block); if (retval) { es->err = retval; return BLOCK_ABORT; } memset(block, 0, fs->blocksize); retval = io_channel_write_blk(fs->io, new_blk, 1, block); } if (retval) { es->err = retval; return BLOCK_ABORT; } ext2fs_free_mem(&block); *blocknr = new_blk; ext2fs_block_alloc_stats(fs, new_blk, +1); es->newblocks++; 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; es.done = 0; es.err = 0; es.newblocks = 0; retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND, 0, expand_dir_proc, &es); 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; inode.i_blocks += (fs->blocksize / 512) * es.newblocks; retval = ext2fs_write_inode(fs, dir, &inode); if (retval) return retval; return 0; }