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, 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 (offset) 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 } 99 100
