1 /****************************************************************************
2 * fs/vfs/fs_rmdir.c
3 *
4 * Copyright (C) 2007-2009, 2014, 2017 Gregory Nutt. All rights reserved.
5 * Author: Gregory Nutt <gnutt@nuttx.org>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name NuttX nor the names of its contributors may be
18 * used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
28 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 *
34 ****************************************************************************/
35
36 /****************************************************************************
37 * Included Files
38 ****************************************************************************/
39
40 #include "vfs_config.h"
41
42 #include "unistd.h"
43 #include "errno.h"
44 #include "stdlib.h"
45 #include "vnode.h"
46 #include "sys/stat.h"
47 #include "string.h"
48 #include "limits.h"
49 #include "fs/mount.h"
50
51 /****************************************************************************
52 * Private Functions
53 ****************************************************************************/
check_target(struct Vnode * vnode,char * name)54 static int check_target(struct Vnode *vnode, char *name)
55 {
56 if (vnode == NULL)
57 {
58 return -ENOENT;
59 }
60
61 if ((vnode->originMount) && (vnode->originMount->mountFlags & MS_RDONLY))
62 {
63 return -EROFS;
64 }
65
66 if (vnode->type != VNODE_TYPE_DIR)
67 {
68 return -ENOTDIR;
69 }
70
71 if (vnode->useCount > 0)
72 {
73 return -EBUSY;
74 }
75
76 if ((vnode->flag & VNODE_FLAG_MOUNT_ORIGIN)
77 || (vnode->flag & VNODE_FLAG_MOUNT_NEW))
78 {
79 return -EBUSY;
80 }
81
82 char cwd[PATH_MAX];
83 char *pret = getcwd(cwd, PATH_MAX);
84 if (pret != NULL)
85 {
86 struct Vnode *cwdnode = NULL;
87 int ret = VnodeLookup(cwd, &cwdnode, 0);
88 if (ret == OK && (cwdnode == vnode))
89 {
90 return -EBUSY;
91 }
92 }
93 return OK;
94 }
95 /****************************************************************************
96 * Public Functions
97 ****************************************************************************/
98
99 /****************************************************************************
100 * Name: do_rmdir
101 *
102 * Description: Remove a file managed a mountpoint
103 *
104 ****************************************************************************/
105
do_rmdir(int dirfd,const char * pathname)106 int do_rmdir(int dirfd, const char *pathname)
107 {
108 struct Vnode *vnode = NULL;
109 char *fullpath = NULL;
110 char *relativepath = NULL;
111 char *name = NULL;
112 int ret;
113
114 if (pathname == NULL)
115 {
116 ret = -EINVAL;
117 goto errout;
118 }
119
120 /* Get relative path by dirfd*/
121 ret = get_path_from_fd(dirfd, &relativepath);
122 if (ret < 0)
123 {
124 goto errout;
125 }
126
127 if (relativepath)
128 {
129 ret = vfs_normalize_path((const char *)relativepath, pathname, &fullpath);
130 free(relativepath);
131 if (ret < 0)
132 {
133 goto errout;
134 }
135
136 name = strrchr(fullpath, '/');
137 VnodeHold();
138 ret = VnodeLookup(fullpath, &vnode, 0);
139 }
140 else
141 {
142 name = strrchr(pathname, '/');
143 VnodeHold();
144 if (name == NULL)
145 {
146 name = (char *)pathname;
147 }
148 else
149 {
150 name++;
151 }
152 ret = VnodeLookup(pathname, &vnode, 0);
153 }
154
155 if (ret != OK)
156 {
157 goto errout_with_lock;
158 }
159
160 ret = check_target(vnode, name);
161 if (ret != OK) {
162 PRINT_ERR("rmdir failed err = %d\n", ret);
163 goto errout_with_lock;
164 }
165
166 if (VfsVnodePermissionCheck(vnode->parent, (WRITE_OP | EXEC_OP))) {
167 ret = -EACCES;
168 goto errout_with_lock;
169 }
170
171 if (vnode && vnode->vop && vnode->vop->Rmdir) {
172 ret = vnode->vop->Rmdir(vnode->parent, vnode, name);
173 } else {
174 ret = -ENOSYS;
175 }
176 if (ret < 0) {
177 goto errout_with_lock;
178 }
179 VnodeFree(vnode);
180 VnodeDrop();
181
182 /* Successfully unlinked */
183 if (fullpath)
184 {
185 free(fullpath);
186 }
187
188 return OK;
189
190 errout_with_lock:
191 VnodeDrop();
192
193 errout:
194 if (fullpath)
195 {
196 free(fullpath);
197 }
198
199 set_errno(-ret);
200 return VFS_ERROR;
201 }
202
203 /****************************************************************************
204 * Name: rmdir
205 *
206 * Description: Remove a file managed a mountpoint
207 *
208 ****************************************************************************/
209
rmdir(const char * pathname)210 int rmdir(const char *pathname)
211 {
212 return do_rmdir(AT_FDCWD, pathname);
213 }
214