[821] | 1 | /*
|
---|
| 2 | * unlink.c --- delete links in a ext2fs directory
|
---|
| 3 | *
|
---|
| 4 | * Copyright (C) 1993, 1994, 1997 Theodore Ts'o.
|
---|
| 5 | *
|
---|
| 6 | * %Begin-Header%
|
---|
| 7 | * This file may be redistributed under the terms of the GNU Public
|
---|
| 8 | * License.
|
---|
| 9 | * %End-Header%
|
---|
| 10 | */
|
---|
| 11 |
|
---|
| 12 | #include <stdio.h>
|
---|
| 13 | #include <string.h>
|
---|
| 14 | #if HAVE_UNISTD_H
|
---|
| 15 | #include <unistd.h>
|
---|
| 16 | #endif
|
---|
| 17 |
|
---|
| 18 | #include "ext2_fs.h"
|
---|
| 19 | #include "ext2fs.h"
|
---|
| 20 |
|
---|
| 21 | struct link_struct {
|
---|
| 22 | const char *name;
|
---|
| 23 | int namelen;
|
---|
| 24 | ext2_ino_t inode;
|
---|
| 25 | int flags;
|
---|
| 26 | struct ext2_dir_entry *prev;
|
---|
| 27 | int done;
|
---|
| 28 | };
|
---|
| 29 |
|
---|
| 30 | #ifdef __TURBOC__
|
---|
| 31 | # pragma argsused
|
---|
| 32 | #endif
|
---|
| 33 | static int unlink_proc(struct ext2_dir_entry *dirent,
|
---|
| 34 | int offset EXT2FS_ATTR((unused)),
|
---|
| 35 | int blocksize EXT2FS_ATTR((unused)),
|
---|
| 36 | char *buf EXT2FS_ATTR((unused)),
|
---|
| 37 | void *priv_data)
|
---|
| 38 | {
|
---|
| 39 | struct link_struct *ls = (struct link_struct *) priv_data;
|
---|
| 40 | struct ext2_dir_entry *prev;
|
---|
| 41 |
|
---|
| 42 | prev = ls->prev;
|
---|
| 43 | ls->prev = dirent;
|
---|
| 44 |
|
---|
| 45 | if (ls->name) {
|
---|
| 46 | if ((dirent->name_len & 0xFF) != ls->namelen)
|
---|
| 47 | return 0;
|
---|
| 48 | if (strncmp(ls->name, dirent->name, dirent->name_len & 0xFF))
|
---|
| 49 | return 0;
|
---|
| 50 | }
|
---|
| 51 | if (ls->inode) {
|
---|
| 52 | if (dirent->inode != ls->inode)
|
---|
| 53 | return 0;
|
---|
| 54 | } else {
|
---|
| 55 | if (!dirent->inode)
|
---|
| 56 | return 0;
|
---|
| 57 | }
|
---|
| 58 |
|
---|
| 59 | if (prev)
|
---|
| 60 | prev->rec_len += dirent->rec_len;
|
---|
| 61 | else
|
---|
| 62 | dirent->inode = 0;
|
---|
| 63 | ls->done++;
|
---|
| 64 | return DIRENT_ABORT|DIRENT_CHANGED;
|
---|
| 65 | }
|
---|
| 66 |
|
---|
| 67 | #ifdef __TURBOC__
|
---|
| 68 | #pragma argsused
|
---|
| 69 | #endif
|
---|
| 70 | errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
|
---|
| 71 | const char *name, ext2_ino_t ino,
|
---|
| 72 | int flags EXT2FS_ATTR((unused)))
|
---|
| 73 | {
|
---|
| 74 | errcode_t retval;
|
---|
| 75 | struct link_struct ls;
|
---|
| 76 |
|
---|
| 77 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
---|
| 78 |
|
---|
| 79 | if (!name && !ino)
|
---|
| 80 | return EXT2_ET_INVALID_ARGUMENT;
|
---|
| 81 |
|
---|
| 82 | if (!(fs->flags & EXT2_FLAG_RW))
|
---|
| 83 | return EXT2_ET_RO_FILSYS;
|
---|
| 84 |
|
---|
| 85 | ls.name = name;
|
---|
| 86 | ls.namelen = name ? strlen(name) : 0;
|
---|
| 87 | ls.inode = ino;
|
---|
| 88 | ls.flags = 0;
|
---|
| 89 | ls.done = 0;
|
---|
| 90 | ls.prev = 0;
|
---|
| 91 |
|
---|
| 92 | retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
|
---|
| 93 | 0, unlink_proc, &ls);
|
---|
| 94 | if (retval)
|
---|
| 95 | return retval;
|
---|
| 96 |
|
---|
| 97 | return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
|
---|
| 98 | }
|
---|
| 99 |
|
---|