| 1 | /*
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| 2 | * mkdir.c --- make a directory in the filesystem
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| 3 | *
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| 4 | * Copyright (C) 1994, 1995 Theodore Ts'o.
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| 5 | *
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| 6 | * %Begin-Header%
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| 7 | * This file may be redistributed under the terms of the GNU Public
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| 8 | * License.
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| 9 | * %End-Header%
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| 10 | */
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include <string.h>
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| 14 | #if HAVE_UNISTD_H
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| 15 | #include <unistd.h>
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| 16 | #endif
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| 17 | #include <fcntl.h>
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| 18 | #include <time.h>
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| 19 | #if HAVE_SYS_STAT_H
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| 20 | #include <sys/stat.h>
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| 21 | #endif
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| 22 | #if HAVE_SYS_TYPES_H
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| 23 | #include <sys/types.h>
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| 24 | #endif
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| 25 |
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| 26 | #include "ext2_fs.h"
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| 27 | #include "ext2fs.h"
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| 28 |
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| 29 | #ifndef EXT2_FT_DIR
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| 30 | #define EXT2_FT_DIR 2
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| 31 | #endif
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| 32 |
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| 33 | errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
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| 34 | const char *name)
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| 35 | {
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| 36 | errcode_t retval;
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| 37 | struct ext2_inode parent_inode, inode;
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| 38 | ext2_ino_t ino = inum;
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| 39 | ext2_ino_t scratch_ino;
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| 40 | blk_t blk;
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| 41 | char *block = 0;
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| 42 |
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| 43 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 44 |
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| 45 | /*
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| 46 | * Allocate an inode, if necessary
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| 47 | */
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| 48 | if (!ino) {
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| 49 | retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755,
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| 50 | 0, &ino);
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| 51 | if (retval)
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| 52 | goto cleanup;
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| 53 | }
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| 54 |
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| 55 | /*
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| 56 | * Allocate a data block for the directory
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| 57 | */
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| 58 | retval = ext2fs_new_block(fs, 0, 0, &blk);
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| 59 | if (retval)
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| 60 | goto cleanup;
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| 61 |
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| 62 | /*
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| 63 | * Create a scratch template for the directory
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| 64 | */
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| 65 | retval = ext2fs_new_dir_block(fs, ino, parent, &block);
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| 66 | if (retval)
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| 67 | goto cleanup;
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| 68 |
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| 69 | /*
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| 70 | * Get the parent's inode, if necessary
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| 71 | */
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| 72 | if (parent != ino) {
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| 73 | retval = ext2fs_read_inode(fs, parent, &parent_inode);
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| 74 | if (retval)
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| 75 | goto cleanup;
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| 76 | } else
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| 77 | memset(&parent_inode, 0, sizeof(parent_inode));
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| 78 |
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| 79 | /*
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| 80 | * Create the inode structure....
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| 81 | */
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| 82 | memset(&inode, 0, sizeof(struct ext2_inode));
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| 83 | inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
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| 84 | inode.i_uid = inode.i_gid = 0;
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| 85 | inode.i_blocks = fs->blocksize / 512;
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| 86 | inode.i_block[0] = blk;
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| 87 | inode.i_links_count = 2;
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| 88 | inode.i_ctime = inode.i_atime = inode.i_mtime = time(NULL);
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| 89 | inode.i_size = fs->blocksize;
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| 90 |
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| 91 | /*
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| 92 | * Write out the inode and inode data block
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| 93 | */
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| 94 | retval = ext2fs_write_dir_block(fs, blk, block);
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| 95 | if (retval)
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| 96 | goto cleanup;
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| 97 | retval = ext2fs_write_new_inode(fs, ino, &inode);
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| 98 | if (retval)
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| 99 | goto cleanup;
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| 100 |
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| 101 | /*
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| 102 | * Link the directory into the filesystem hierarchy
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| 103 | */
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| 104 | if (name) {
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| 105 | retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
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| 106 | &scratch_ino);
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| 107 | if (!retval) {
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| 108 | retval = EXT2_ET_DIR_EXISTS;
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| 109 | name = 0;
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| 110 | goto cleanup;
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| 111 | }
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| 112 | if (retval != EXT2_ET_FILE_NOT_FOUND)
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| 113 | goto cleanup;
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| 114 | retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
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| 115 | if (retval)
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| 116 | goto cleanup;
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| 117 | }
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| 118 |
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| 119 | /*
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| 120 | * Update parent inode's counts
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| 121 | */
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| 122 | if (parent != ino) {
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| 123 | parent_inode.i_links_count++;
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| 124 | retval = ext2fs_write_inode(fs, parent, &parent_inode);
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| 125 | if (retval)
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| 126 | goto cleanup;
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| 127 | }
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| 128 |
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| 129 | /*
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| 130 | * Update accounting....
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| 131 | */
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| 132 | ext2fs_block_alloc_stats(fs, blk, +1);
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| 133 | ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
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| 134 |
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| 135 | cleanup:
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| 136 | ext2fs_free_mem(&block);
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| 137 | return retval;
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| 138 |
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| 139 | }
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| 140 |
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| 141 |
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