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1/*
2 * linux/fs/sysv/namei.c
3 *
4 * minix/namei.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * coh/namei.c
8 * Copyright (C) 1993 Pascal Haible, Bruno Haible
9 *
10 * sysv/namei.c
11 * Copyright (C) 1993 Bruno Haible
12 * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
13 */
14
15#include <linux/pagemap.h>
16#include "sysv.h"
17
18static int add_nondir(struct dentry *dentry, struct inode *inode)
19{
20 int err = sysv_add_link(dentry, inode);
21 if (!err) {
22 d_instantiate(dentry, inode);
23 return 0;
24 }
25 inode_dec_link_count(inode);
26 iput(inode);
27 return err;
28}
29
30static int sysv_hash(const struct dentry *dentry, struct qstr *qstr)
31{
32 /* Truncate the name in place, avoids having to define a compare
33 function. */
34 if (qstr->len > SYSV_NAMELEN) {
35 qstr->len = SYSV_NAMELEN;
36 qstr->hash = full_name_hash(qstr->name, qstr->len);
37 }
38 return 0;
39}
40
41const struct dentry_operations sysv_dentry_operations = {
42 .d_hash = sysv_hash,
43};
44
45static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
46{
47 struct inode * inode = NULL;
48 ino_t ino;
49
50 if (dentry->d_name.len > SYSV_NAMELEN)
51 return ERR_PTR(-ENAMETOOLONG);
52 ino = sysv_inode_by_name(dentry);
53
54 if (ino) {
55 inode = sysv_iget(dir->i_sb, ino);
56 if (IS_ERR(inode))
57 return ERR_CAST(inode);
58 }
59 d_add(dentry, inode);
60 return NULL;
61}
62
63static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev)
64{
65 struct inode * inode;
66 int err;
67
68 if (!old_valid_dev(rdev))
69 return -EINVAL;
70
71 inode = sysv_new_inode(dir, mode);
72 err = PTR_ERR(inode);
73
74 if (!IS_ERR(inode)) {
75 sysv_set_inode(inode, rdev);
76 mark_inode_dirty(inode);
77 err = add_nondir(dentry, inode);
78 }
79 return err;
80}
81
82static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
83{
84 return sysv_mknod(dir, dentry, mode, 0);
85}
86
87static int sysv_symlink(struct inode * dir, struct dentry * dentry,
88 const char * symname)
89{
90 int err = -ENAMETOOLONG;
91 int l = strlen(symname)+1;
92 struct inode * inode;
93
94 if (l > dir->i_sb->s_blocksize)
95 goto out;
96
97 inode = sysv_new_inode(dir, S_IFLNK|0777);
98 err = PTR_ERR(inode);
99 if (IS_ERR(inode))
100 goto out;
101
102 sysv_set_inode(inode, 0);
103 err = page_symlink(inode, symname, l);
104 if (err)
105 goto out_fail;
106
107 mark_inode_dirty(inode);
108 err = add_nondir(dentry, inode);
109out:
110 return err;
111
112out_fail:
113 inode_dec_link_count(inode);
114 iput(inode);
115 goto out;
116}
117
118static int sysv_link(struct dentry * old_dentry, struct inode * dir,
119 struct dentry * dentry)
120{
121 struct inode *inode = old_dentry->d_inode;
122
123 inode->i_ctime = CURRENT_TIME_SEC;
124 inode_inc_link_count(inode);
125 ihold(inode);
126
127 return add_nondir(dentry, inode);
128}
129
130static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
131{
132 struct inode * inode;
133 int err;
134
135 inode_inc_link_count(dir);
136
137 inode = sysv_new_inode(dir, S_IFDIR|mode);
138 err = PTR_ERR(inode);
139 if (IS_ERR(inode))
140 goto out_dir;
141
142 sysv_set_inode(inode, 0);
143
144 inode_inc_link_count(inode);
145
146 err = sysv_make_empty(inode, dir);
147 if (err)
148 goto out_fail;
149
150 err = sysv_add_link(dentry, inode);
151 if (err)
152 goto out_fail;
153
154 d_instantiate(dentry, inode);
155out:
156 return err;
157
158out_fail:
159 inode_dec_link_count(inode);
160 inode_dec_link_count(inode);
161 iput(inode);
162out_dir:
163 inode_dec_link_count(dir);
164 goto out;
165}
166
167static int sysv_unlink(struct inode * dir, struct dentry * dentry)
168{
169 struct inode * inode = dentry->d_inode;
170 struct page * page;
171 struct sysv_dir_entry * de;
172 int err = -ENOENT;
173
174 de = sysv_find_entry(dentry, &page);
175 if (!de)
176 goto out;
177
178 err = sysv_delete_entry (de, page);
179 if (err)
180 goto out;
181
182 inode->i_ctime = dir->i_ctime;
183 inode_dec_link_count(inode);
184out:
185 return err;
186}
187
188static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
189{
190 struct inode *inode = dentry->d_inode;
191 int err = -ENOTEMPTY;
192
193 if (sysv_empty_dir(inode)) {
194 err = sysv_unlink(dir, dentry);
195 if (!err) {
196 inode->i_size = 0;
197 inode_dec_link_count(inode);
198 inode_dec_link_count(dir);
199 }
200 }
201 return err;
202}
203
204/*
205 * Anybody can rename anything with this: the permission checks are left to the
206 * higher-level routines.
207 */
208static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
209 struct inode * new_dir, struct dentry * new_dentry)
210{
211 struct inode * old_inode = old_dentry->d_inode;
212 struct inode * new_inode = new_dentry->d_inode;
213 struct page * dir_page = NULL;
214 struct sysv_dir_entry * dir_de = NULL;
215 struct page * old_page;
216 struct sysv_dir_entry * old_de;
217 int err = -ENOENT;
218
219 old_de = sysv_find_entry(old_dentry, &old_page);
220 if (!old_de)
221 goto out;
222
223 if (S_ISDIR(old_inode->i_mode)) {
224 err = -EIO;
225 dir_de = sysv_dotdot(old_inode, &dir_page);
226 if (!dir_de)
227 goto out_old;
228 }
229
230 if (new_inode) {
231 struct page * new_page;
232 struct sysv_dir_entry * new_de;
233
234 err = -ENOTEMPTY;
235 if (dir_de && !sysv_empty_dir(new_inode))
236 goto out_dir;
237
238 err = -ENOENT;
239 new_de = sysv_find_entry(new_dentry, &new_page);
240 if (!new_de)
241 goto out_dir;
242 sysv_set_link(new_de, new_page, old_inode);
243 new_inode->i_ctime = CURRENT_TIME_SEC;
244 if (dir_de)
245 drop_nlink(new_inode);
246 inode_dec_link_count(new_inode);
247 } else {
248 err = sysv_add_link(new_dentry, old_inode);
249 if (err)
250 goto out_dir;
251 if (dir_de)
252 inode_inc_link_count(new_dir);
253 }
254
255 sysv_delete_entry(old_de, old_page);
256 mark_inode_dirty(old_inode);
257
258 if (dir_de) {
259 sysv_set_link(dir_de, dir_page, new_dir);
260 inode_dec_link_count(old_dir);
261 }
262 return 0;
263
264out_dir:
265 if (dir_de) {
266 kunmap(dir_page);
267 page_cache_release(dir_page);
268 }
269out_old:
270 kunmap(old_page);
271 page_cache_release(old_page);
272out:
273 return err;
274}
275
276/*
277 * directories can handle most operations...
278 */
279const struct inode_operations sysv_dir_inode_operations = {
280 .create = sysv_create,
281 .lookup = sysv_lookup,
282 .link = sysv_link,
283 .unlink = sysv_unlink,
284 .symlink = sysv_symlink,
285 .mkdir = sysv_mkdir,
286 .rmdir = sysv_rmdir,
287 .mknod = sysv_mknod,
288 .rename = sysv_rename,
289 .getattr = sysv_getattr,
290};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/sysv/namei.c
4 *
5 * minix/namei.c
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 *
8 * coh/namei.c
9 * Copyright (C) 1993 Pascal Haible, Bruno Haible
10 *
11 * sysv/namei.c
12 * Copyright (C) 1993 Bruno Haible
13 * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
14 */
15
16#include <linux/pagemap.h>
17#include "sysv.h"
18
19static int add_nondir(struct dentry *dentry, struct inode *inode)
20{
21 int err = sysv_add_link(dentry, inode);
22 if (!err) {
23 d_instantiate(dentry, inode);
24 return 0;
25 }
26 inode_dec_link_count(inode);
27 iput(inode);
28 return err;
29}
30
31static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
32{
33 struct inode * inode = NULL;
34 ino_t ino;
35
36 if (dentry->d_name.len > SYSV_NAMELEN)
37 return ERR_PTR(-ENAMETOOLONG);
38 ino = sysv_inode_by_name(dentry);
39 if (ino)
40 inode = sysv_iget(dir->i_sb, ino);
41 return d_splice_alias(inode, dentry);
42}
43
44static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev)
45{
46 struct inode * inode;
47 int err;
48
49 if (!old_valid_dev(rdev))
50 return -EINVAL;
51
52 inode = sysv_new_inode(dir, mode);
53 err = PTR_ERR(inode);
54
55 if (!IS_ERR(inode)) {
56 sysv_set_inode(inode, rdev);
57 mark_inode_dirty(inode);
58 err = add_nondir(dentry, inode);
59 }
60 return err;
61}
62
63static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
64{
65 return sysv_mknod(dir, dentry, mode, 0);
66}
67
68static int sysv_symlink(struct inode * dir, struct dentry * dentry,
69 const char * symname)
70{
71 int err = -ENAMETOOLONG;
72 int l = strlen(symname)+1;
73 struct inode * inode;
74
75 if (l > dir->i_sb->s_blocksize)
76 goto out;
77
78 inode = sysv_new_inode(dir, S_IFLNK|0777);
79 err = PTR_ERR(inode);
80 if (IS_ERR(inode))
81 goto out;
82
83 sysv_set_inode(inode, 0);
84 err = page_symlink(inode, symname, l);
85 if (err)
86 goto out_fail;
87
88 mark_inode_dirty(inode);
89 err = add_nondir(dentry, inode);
90out:
91 return err;
92
93out_fail:
94 inode_dec_link_count(inode);
95 iput(inode);
96 goto out;
97}
98
99static int sysv_link(struct dentry * old_dentry, struct inode * dir,
100 struct dentry * dentry)
101{
102 struct inode *inode = d_inode(old_dentry);
103
104 inode->i_ctime = current_time(inode);
105 inode_inc_link_count(inode);
106 ihold(inode);
107
108 return add_nondir(dentry, inode);
109}
110
111static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
112{
113 struct inode * inode;
114 int err;
115
116 inode_inc_link_count(dir);
117
118 inode = sysv_new_inode(dir, S_IFDIR|mode);
119 err = PTR_ERR(inode);
120 if (IS_ERR(inode))
121 goto out_dir;
122
123 sysv_set_inode(inode, 0);
124
125 inode_inc_link_count(inode);
126
127 err = sysv_make_empty(inode, dir);
128 if (err)
129 goto out_fail;
130
131 err = sysv_add_link(dentry, inode);
132 if (err)
133 goto out_fail;
134
135 d_instantiate(dentry, inode);
136out:
137 return err;
138
139out_fail:
140 inode_dec_link_count(inode);
141 inode_dec_link_count(inode);
142 iput(inode);
143out_dir:
144 inode_dec_link_count(dir);
145 goto out;
146}
147
148static int sysv_unlink(struct inode * dir, struct dentry * dentry)
149{
150 struct inode * inode = d_inode(dentry);
151 struct page * page;
152 struct sysv_dir_entry * de;
153 int err = -ENOENT;
154
155 de = sysv_find_entry(dentry, &page);
156 if (!de)
157 goto out;
158
159 err = sysv_delete_entry (de, page);
160 if (err)
161 goto out;
162
163 inode->i_ctime = dir->i_ctime;
164 inode_dec_link_count(inode);
165out:
166 return err;
167}
168
169static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
170{
171 struct inode *inode = d_inode(dentry);
172 int err = -ENOTEMPTY;
173
174 if (sysv_empty_dir(inode)) {
175 err = sysv_unlink(dir, dentry);
176 if (!err) {
177 inode->i_size = 0;
178 inode_dec_link_count(inode);
179 inode_dec_link_count(dir);
180 }
181 }
182 return err;
183}
184
185/*
186 * Anybody can rename anything with this: the permission checks are left to the
187 * higher-level routines.
188 */
189static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
190 struct inode * new_dir, struct dentry * new_dentry,
191 unsigned int flags)
192{
193 struct inode * old_inode = d_inode(old_dentry);
194 struct inode * new_inode = d_inode(new_dentry);
195 struct page * dir_page = NULL;
196 struct sysv_dir_entry * dir_de = NULL;
197 struct page * old_page;
198 struct sysv_dir_entry * old_de;
199 int err = -ENOENT;
200
201 if (flags & ~RENAME_NOREPLACE)
202 return -EINVAL;
203
204 old_de = sysv_find_entry(old_dentry, &old_page);
205 if (!old_de)
206 goto out;
207
208 if (S_ISDIR(old_inode->i_mode)) {
209 err = -EIO;
210 dir_de = sysv_dotdot(old_inode, &dir_page);
211 if (!dir_de)
212 goto out_old;
213 }
214
215 if (new_inode) {
216 struct page * new_page;
217 struct sysv_dir_entry * new_de;
218
219 err = -ENOTEMPTY;
220 if (dir_de && !sysv_empty_dir(new_inode))
221 goto out_dir;
222
223 err = -ENOENT;
224 new_de = sysv_find_entry(new_dentry, &new_page);
225 if (!new_de)
226 goto out_dir;
227 sysv_set_link(new_de, new_page, old_inode);
228 new_inode->i_ctime = current_time(new_inode);
229 if (dir_de)
230 drop_nlink(new_inode);
231 inode_dec_link_count(new_inode);
232 } else {
233 err = sysv_add_link(new_dentry, old_inode);
234 if (err)
235 goto out_dir;
236 if (dir_de)
237 inode_inc_link_count(new_dir);
238 }
239
240 sysv_delete_entry(old_de, old_page);
241 mark_inode_dirty(old_inode);
242
243 if (dir_de) {
244 sysv_set_link(dir_de, dir_page, new_dir);
245 inode_dec_link_count(old_dir);
246 }
247 return 0;
248
249out_dir:
250 if (dir_de) {
251 kunmap(dir_page);
252 put_page(dir_page);
253 }
254out_old:
255 kunmap(old_page);
256 put_page(old_page);
257out:
258 return err;
259}
260
261/*
262 * directories can handle most operations...
263 */
264const struct inode_operations sysv_dir_inode_operations = {
265 .create = sysv_create,
266 .lookup = sysv_lookup,
267 .link = sysv_link,
268 .unlink = sysv_unlink,
269 .symlink = sysv_symlink,
270 .mkdir = sysv_mkdir,
271 .rmdir = sysv_rmdir,
272 .mknod = sysv_mknod,
273 .rename = sysv_rename,
274 .getattr = sysv_getattr,
275};