mirror of https://github.com/vitalif/e2fsprogs
135 lines
2.8 KiB
C
135 lines
2.8 KiB
C
/*
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* mkdir.c --- make a directory in the filesystem
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*
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* Copyright (C) 1994 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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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <time.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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errcode_t ext2fs_mkdir(ext2_filsys fs, ino_t parent, ino_t inum,
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const char *name)
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{
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errcode_t retval;
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struct ext2_inode inode;
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ino_t ino = inum;
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ino_t scratch_ino;
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blk_t blk;
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char *block = 0;
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int group;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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/*
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* Allocate an inode, if necessary
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*/
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if (!ino) {
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retval = ext2fs_new_inode(fs, parent, S_IFDIR | 0755, 0, &ino);
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if (retval)
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goto cleanup;
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}
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/*
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* Allocate a data block for the directory
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*/
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retval = ext2fs_new_block(fs, 0, 0, &blk);
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if (retval)
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goto cleanup;
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/*
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* Create a scratch template for the directory
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*/
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retval = ext2fs_new_dir_block(fs, ino, parent, &block);
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if (retval)
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goto cleanup;
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/*
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* Create the inode structure....
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*/
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memset(&inode, 0, sizeof(struct ext2_inode));
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inode.i_mode = S_IFDIR | 0755;
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inode.i_uid = inode.i_gid = 0;
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inode.i_blocks = fs->blocksize / 512;
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inode.i_block[0] = blk;
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inode.i_links_count = 2;
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inode.i_ctime = inode.i_atime = inode.i_mtime = time(NULL);
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inode.i_size = fs->blocksize;
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/*
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* Write out the inode and inode data block
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*/
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retval = io_channel_write_blk(fs->io, blk, 1, block);
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if (retval)
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goto cleanup;
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retval = ext2fs_write_inode(fs, ino, &inode);
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if (retval)
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goto cleanup;
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/*
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* Update parent inode's counts
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*/
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if (parent != ino) {
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retval = ext2fs_read_inode(fs, parent, &inode);
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if (retval)
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goto cleanup;
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inode.i_links_count++;
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retval = ext2fs_write_inode(fs, parent, &inode);
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if (retval)
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goto cleanup;
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}
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/*
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* Link the directory into the filesystem hierarchy
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*/
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if (name) {
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retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
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&scratch_ino);
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if (!retval) {
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retval = EEXIST;
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name = 0;
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goto cleanup;
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}
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if (retval != ENOENT)
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goto cleanup;
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retval = ext2fs_link(fs, parent, name, ino, 0);
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if (retval)
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goto cleanup;
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}
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/*
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* Update accounting....
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*/
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ext2fs_mark_block_bitmap(fs->block_map, blk);
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ext2fs_mark_bb_dirty(fs);
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ext2fs_mark_inode_bitmap(fs->inode_map, ino);
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ext2fs_mark_ib_dirty(fs);
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group = ext2fs_group_of_blk(fs, blk);
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fs->group_desc[group].bg_free_blocks_count--;
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group = ext2fs_group_of_ino(fs, ino);
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fs->group_desc[group].bg_free_inodes_count--;
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fs->group_desc[group].bg_used_dirs_count++;
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fs->super->s_free_blocks_count--;
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fs->super->s_free_inodes_count--;
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ext2fs_mark_super_dirty(fs);
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cleanup:
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if (block)
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free(block);
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return retval;
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}
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