1 /****************************************************************************
2 * fs/vfs/fs_rmdir.c
3 *
4 * Copyright (c) 2023 Huawei Device Co., Ltd. All rights reserved.
5 * Based on NuttX originally from nuttx source (nuttx/fs/ and nuttx/drivers/)
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 ****************************************************************************/
20
21 /****************************************************************************
22 * Included Files
23 ****************************************************************************/
24
25 #include "vfs_config.h"
26
27 #include "unistd.h"
28 #include "errno.h"
29 #include "stdlib.h"
30 #include "vnode.h"
31 #include "sys/stat.h"
32 #include "string.h"
33 #include "limits.h"
34 #include "fs/mount.h"
35
36 /****************************************************************************
37 * Private Functions
38 ****************************************************************************/
check_target(struct Vnode * vnode,char * name)39 static int check_target(struct Vnode *vnode, char *name)
40 {
41 if (vnode == NULL)
42 {
43 return -ENOENT;
44 }
45
46 if ((vnode->originMount) && (vnode->originMount->mountFlags & MS_RDONLY))
47 {
48 return -EROFS;
49 }
50
51 if (vnode->type != VNODE_TYPE_DIR)
52 {
53 return -ENOTDIR;
54 }
55
56 if (vnode->useCount > 0)
57 {
58 return -EBUSY;
59 }
60
61 if ((vnode->flag & VNODE_FLAG_MOUNT_ORIGIN)
62 || (vnode->flag & VNODE_FLAG_MOUNT_NEW))
63 {
64 return -EBUSY;
65 }
66
67 char cwd[PATH_MAX];
68 char *pret = getcwd(cwd, PATH_MAX);
69 if (pret != NULL)
70 {
71 struct Vnode *cwdnode = NULL;
72 int ret = VnodeLookup(cwd, &cwdnode, 0);
73 if (ret == OK && (cwdnode == vnode))
74 {
75 return -EBUSY;
76 }
77 }
78 return OK;
79 }
80 /****************************************************************************
81 * Public Functions
82 ****************************************************************************/
83
84 /****************************************************************************
85 * Name: do_rmdir
86 *
87 * Description: Remove a file managed a mountpoint
88 *
89 ****************************************************************************/
90
do_rmdir(int dirfd,const char * pathname)91 int do_rmdir(int dirfd, const char *pathname)
92 {
93 struct Vnode *vnode = NULL;
94 char *fullpath = NULL;
95 char *relativepath = NULL;
96 char *name = NULL;
97 int ret;
98
99 if (pathname == NULL)
100 {
101 ret = -EINVAL;
102 goto errout;
103 }
104
105 /* Get relative path by dirfd*/
106 ret = get_path_from_fd(dirfd, &relativepath);
107 if (ret < 0)
108 {
109 goto errout;
110 }
111
112 if (relativepath)
113 {
114 ret = vfs_normalize_path((const char *)relativepath, pathname, &fullpath);
115 free(relativepath);
116 if (ret < 0)
117 {
118 goto errout;
119 }
120
121 name = strrchr(fullpath, '/');
122 VnodeHold();
123 ret = VnodeLookup(fullpath, &vnode, 0);
124 }
125 else
126 {
127 name = strrchr(pathname, '/');
128 VnodeHold();
129 if (name == NULL)
130 {
131 name = (char *)pathname;
132 }
133 else
134 {
135 name++;
136 }
137 ret = VnodeLookup(pathname, &vnode, 0);
138 }
139
140 if (ret != OK)
141 {
142 goto errout_with_lock;
143 }
144
145 ret = check_target(vnode, name);
146 if (ret != OK) {
147 PRINT_ERR("rmdir failed err = %d\n", ret);
148 goto errout_with_lock;
149 }
150
151 if (VfsVnodePermissionCheck(vnode->parent, (WRITE_OP | EXEC_OP))) {
152 ret = -EACCES;
153 goto errout_with_lock;
154 }
155
156 if (vnode && vnode->vop && vnode->vop->Rmdir) {
157 ret = vnode->vop->Rmdir(vnode->parent, vnode, name);
158 } else {
159 ret = -ENOSYS;
160 }
161 if (ret < 0) {
162 goto errout_with_lock;
163 }
164 VnodeFree(vnode);
165 VnodeDrop();
166
167 /* Successfully unlinked */
168 if (fullpath)
169 {
170 free(fullpath);
171 }
172
173 return OK;
174
175 errout_with_lock:
176 VnodeDrop();
177
178 errout:
179 if (fullpath)
180 {
181 free(fullpath);
182 }
183
184 set_errno(-ret);
185 return VFS_ERROR;
186 }
187
188 /****************************************************************************
189 * Name: rmdir
190 *
191 * Description: Remove a file managed a mountpoint
192 *
193 ****************************************************************************/
194
rmdir(const char * pathname)195 int rmdir(const char *pathname)
196 {
197 return do_rmdir(AT_FDCWD, pathname);
198 }
199