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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext2/namei.c
4 *
5 * Rewrite to pagecache. Almost all code had been changed, so blame me
6 * if the things go wrong. Please, send bug reports to
7 * viro@parcelfarce.linux.theplanet.co.uk
8 *
9 * Stuff here is basically a glue between the VFS and generic UNIXish
10 * filesystem that keeps everything in pagecache. All knowledge of the
11 * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
12 * and it's easier to debug that way. In principle we might want to
13 * generalize that a bit and turn it into a library. Or not.
14 *
15 * The only non-static object here is ext2_dir_inode_operations.
16 *
17 * TODO: get rid of kmap() use, add readahead.
18 *
19 * Copyright (C) 1992, 1993, 1994, 1995
20 * Remy Card (card@masi.ibp.fr)
21 * Laboratoire MASI - Institut Blaise Pascal
22 * Universite Pierre et Marie Curie (Paris VI)
23 *
24 * from
25 *
26 * linux/fs/minix/namei.c
27 *
28 * Copyright (C) 1991, 1992 Linus Torvalds
29 *
30 * Big-endian to little-endian byte-swapping/bitmaps by
31 * David S. Miller (davem@caip.rutgers.edu), 1995
32 */
33
34#include <linux/pagemap.h>
35#include <linux/quotaops.h>
36#include "ext2.h"
37#include "xattr.h"
38#include "acl.h"
39
40static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
41{
42 int err = ext2_add_link(dentry, inode);
43 if (!err) {
44 d_instantiate_new(dentry, inode);
45 return 0;
46 }
47 inode_dec_link_count(inode);
48 discard_new_inode(inode);
49 return err;
50}
51
52/*
53 * Methods themselves.
54 */
55
56static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
57{
58 struct inode * inode;
59 ino_t ino;
60
61 if (dentry->d_name.len > EXT2_NAME_LEN)
62 return ERR_PTR(-ENAMETOOLONG);
63
64 ino = ext2_inode_by_name(dir, &dentry->d_name);
65 inode = NULL;
66 if (ino) {
67 inode = ext2_iget(dir->i_sb, ino);
68 if (inode == ERR_PTR(-ESTALE)) {
69 ext2_error(dir->i_sb, __func__,
70 "deleted inode referenced: %lu",
71 (unsigned long) ino);
72 return ERR_PTR(-EIO);
73 }
74 }
75 return d_splice_alias(inode, dentry);
76}
77
78struct dentry *ext2_get_parent(struct dentry *child)
79{
80 struct qstr dotdot = QSTR_INIT("..", 2);
81 unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
82 if (!ino)
83 return ERR_PTR(-ENOENT);
84 return d_obtain_alias(ext2_iget(child->d_sb, ino));
85}
86
87/*
88 * By the time this is called, we already have created
89 * the directory cache entry for the new file, but it
90 * is so far negative - it has no inode.
91 *
92 * If the create succeeds, we fill in the inode information
93 * with d_instantiate().
94 */
95static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
96{
97 struct inode *inode;
98 int err;
99
100 err = dquot_initialize(dir);
101 if (err)
102 return err;
103
104 inode = ext2_new_inode(dir, mode, &dentry->d_name);
105 if (IS_ERR(inode))
106 return PTR_ERR(inode);
107
108 ext2_set_file_ops(inode);
109 mark_inode_dirty(inode);
110 return ext2_add_nondir(dentry, inode);
111}
112
113static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
114{
115 struct inode *inode = ext2_new_inode(dir, mode, NULL);
116 if (IS_ERR(inode))
117 return PTR_ERR(inode);
118
119 ext2_set_file_ops(inode);
120 mark_inode_dirty(inode);
121 d_tmpfile(dentry, inode);
122 unlock_new_inode(inode);
123 return 0;
124}
125
126static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
127{
128 struct inode * inode;
129 int err;
130
131 err = dquot_initialize(dir);
132 if (err)
133 return err;
134
135 inode = ext2_new_inode (dir, mode, &dentry->d_name);
136 err = PTR_ERR(inode);
137 if (!IS_ERR(inode)) {
138 init_special_inode(inode, inode->i_mode, rdev);
139#ifdef CONFIG_EXT2_FS_XATTR
140 inode->i_op = &ext2_special_inode_operations;
141#endif
142 mark_inode_dirty(inode);
143 err = ext2_add_nondir(dentry, inode);
144 }
145 return err;
146}
147
148static int ext2_symlink (struct inode * dir, struct dentry * dentry,
149 const char * symname)
150{
151 struct super_block * sb = dir->i_sb;
152 int err = -ENAMETOOLONG;
153 unsigned l = strlen(symname)+1;
154 struct inode * inode;
155
156 if (l > sb->s_blocksize)
157 goto out;
158
159 err = dquot_initialize(dir);
160 if (err)
161 goto out;
162
163 inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
164 err = PTR_ERR(inode);
165 if (IS_ERR(inode))
166 goto out;
167
168 if (l > sizeof (EXT2_I(inode)->i_data)) {
169 /* slow symlink */
170 inode->i_op = &ext2_symlink_inode_operations;
171 inode_nohighmem(inode);
172 if (test_opt(inode->i_sb, NOBH))
173 inode->i_mapping->a_ops = &ext2_nobh_aops;
174 else
175 inode->i_mapping->a_ops = &ext2_aops;
176 err = page_symlink(inode, symname, l);
177 if (err)
178 goto out_fail;
179 } else {
180 /* fast symlink */
181 inode->i_op = &ext2_fast_symlink_inode_operations;
182 inode->i_link = (char*)EXT2_I(inode)->i_data;
183 memcpy(inode->i_link, symname, l);
184 inode->i_size = l-1;
185 }
186 mark_inode_dirty(inode);
187
188 err = ext2_add_nondir(dentry, inode);
189out:
190 return err;
191
192out_fail:
193 inode_dec_link_count(inode);
194 discard_new_inode(inode);
195 goto out;
196}
197
198static int ext2_link (struct dentry * old_dentry, struct inode * dir,
199 struct dentry *dentry)
200{
201 struct inode *inode = d_inode(old_dentry);
202 int err;
203
204 err = dquot_initialize(dir);
205 if (err)
206 return err;
207
208 inode->i_ctime = current_time(inode);
209 inode_inc_link_count(inode);
210 ihold(inode);
211
212 err = ext2_add_link(dentry, inode);
213 if (!err) {
214 d_instantiate(dentry, inode);
215 return 0;
216 }
217 inode_dec_link_count(inode);
218 iput(inode);
219 return err;
220}
221
222static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
223{
224 struct inode * inode;
225 int err;
226
227 err = dquot_initialize(dir);
228 if (err)
229 return err;
230
231 inode_inc_link_count(dir);
232
233 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
234 err = PTR_ERR(inode);
235 if (IS_ERR(inode))
236 goto out_dir;
237
238 inode->i_op = &ext2_dir_inode_operations;
239 inode->i_fop = &ext2_dir_operations;
240 if (test_opt(inode->i_sb, NOBH))
241 inode->i_mapping->a_ops = &ext2_nobh_aops;
242 else
243 inode->i_mapping->a_ops = &ext2_aops;
244
245 inode_inc_link_count(inode);
246
247 err = ext2_make_empty(inode, dir);
248 if (err)
249 goto out_fail;
250
251 err = ext2_add_link(dentry, inode);
252 if (err)
253 goto out_fail;
254
255 d_instantiate_new(dentry, inode);
256out:
257 return err;
258
259out_fail:
260 inode_dec_link_count(inode);
261 inode_dec_link_count(inode);
262 discard_new_inode(inode);
263out_dir:
264 inode_dec_link_count(dir);
265 goto out;
266}
267
268static int ext2_unlink(struct inode * dir, struct dentry *dentry)
269{
270 struct inode * inode = d_inode(dentry);
271 struct ext2_dir_entry_2 * de;
272 struct page * page;
273 int err;
274
275 err = dquot_initialize(dir);
276 if (err)
277 goto out;
278
279 de = ext2_find_entry (dir, &dentry->d_name, &page);
280 if (!de) {
281 err = -ENOENT;
282 goto out;
283 }
284
285 err = ext2_delete_entry (de, page);
286 if (err)
287 goto out;
288
289 inode->i_ctime = dir->i_ctime;
290 inode_dec_link_count(inode);
291 err = 0;
292out:
293 return err;
294}
295
296static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
297{
298 struct inode * inode = d_inode(dentry);
299 int err = -ENOTEMPTY;
300
301 if (ext2_empty_dir(inode)) {
302 err = ext2_unlink(dir, dentry);
303 if (!err) {
304 inode->i_size = 0;
305 inode_dec_link_count(inode);
306 inode_dec_link_count(dir);
307 }
308 }
309 return err;
310}
311
312static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
313 struct inode * new_dir, struct dentry * new_dentry,
314 unsigned int flags)
315{
316 struct inode * old_inode = d_inode(old_dentry);
317 struct inode * new_inode = d_inode(new_dentry);
318 struct page * dir_page = NULL;
319 struct ext2_dir_entry_2 * dir_de = NULL;
320 struct page * old_page;
321 struct ext2_dir_entry_2 * old_de;
322 int err;
323
324 if (flags & ~RENAME_NOREPLACE)
325 return -EINVAL;
326
327 err = dquot_initialize(old_dir);
328 if (err)
329 goto out;
330
331 err = dquot_initialize(new_dir);
332 if (err)
333 goto out;
334
335 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
336 if (!old_de) {
337 err = -ENOENT;
338 goto out;
339 }
340
341 if (S_ISDIR(old_inode->i_mode)) {
342 err = -EIO;
343 dir_de = ext2_dotdot(old_inode, &dir_page);
344 if (!dir_de)
345 goto out_old;
346 }
347
348 if (new_inode) {
349 struct page *new_page;
350 struct ext2_dir_entry_2 *new_de;
351
352 err = -ENOTEMPTY;
353 if (dir_de && !ext2_empty_dir (new_inode))
354 goto out_dir;
355
356 err = -ENOENT;
357 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
358 if (!new_de)
359 goto out_dir;
360 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
361 new_inode->i_ctime = current_time(new_inode);
362 if (dir_de)
363 drop_nlink(new_inode);
364 inode_dec_link_count(new_inode);
365 } else {
366 err = ext2_add_link(new_dentry, old_inode);
367 if (err)
368 goto out_dir;
369 if (dir_de)
370 inode_inc_link_count(new_dir);
371 }
372
373 /*
374 * Like most other Unix systems, set the ctime for inodes on a
375 * rename.
376 */
377 old_inode->i_ctime = current_time(old_inode);
378 mark_inode_dirty(old_inode);
379
380 ext2_delete_entry (old_de, old_page);
381
382 if (dir_de) {
383 if (old_dir != new_dir)
384 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
385 else {
386 kunmap(dir_page);
387 put_page(dir_page);
388 }
389 inode_dec_link_count(old_dir);
390 }
391 return 0;
392
393
394out_dir:
395 if (dir_de) {
396 kunmap(dir_page);
397 put_page(dir_page);
398 }
399out_old:
400 kunmap(old_page);
401 put_page(old_page);
402out:
403 return err;
404}
405
406const struct inode_operations ext2_dir_inode_operations = {
407 .create = ext2_create,
408 .lookup = ext2_lookup,
409 .link = ext2_link,
410 .unlink = ext2_unlink,
411 .symlink = ext2_symlink,
412 .mkdir = ext2_mkdir,
413 .rmdir = ext2_rmdir,
414 .mknod = ext2_mknod,
415 .rename = ext2_rename,
416#ifdef CONFIG_EXT2_FS_XATTR
417 .listxattr = ext2_listxattr,
418#endif
419 .getattr = ext2_getattr,
420 .setattr = ext2_setattr,
421 .get_acl = ext2_get_acl,
422 .set_acl = ext2_set_acl,
423 .tmpfile = ext2_tmpfile,
424};
425
426const struct inode_operations ext2_special_inode_operations = {
427#ifdef CONFIG_EXT2_FS_XATTR
428 .listxattr = ext2_listxattr,
429#endif
430 .getattr = ext2_getattr,
431 .setattr = ext2_setattr,
432 .get_acl = ext2_get_acl,
433 .set_acl = ext2_set_acl,
434};
1/*
2 * linux/fs/ext2/namei.c
3 *
4 * Rewrite to pagecache. Almost all code had been changed, so blame me
5 * if the things go wrong. Please, send bug reports to
6 * viro@parcelfarce.linux.theplanet.co.uk
7 *
8 * Stuff here is basically a glue between the VFS and generic UNIXish
9 * filesystem that keeps everything in pagecache. All knowledge of the
10 * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
11 * and it's easier to debug that way. In principle we might want to
12 * generalize that a bit and turn it into a library. Or not.
13 *
14 * The only non-static object here is ext2_dir_inode_operations.
15 *
16 * TODO: get rid of kmap() use, add readahead.
17 *
18 * Copyright (C) 1992, 1993, 1994, 1995
19 * Remy Card (card@masi.ibp.fr)
20 * Laboratoire MASI - Institut Blaise Pascal
21 * Universite Pierre et Marie Curie (Paris VI)
22 *
23 * from
24 *
25 * linux/fs/minix/namei.c
26 *
27 * Copyright (C) 1991, 1992 Linus Torvalds
28 *
29 * Big-endian to little-endian byte-swapping/bitmaps by
30 * David S. Miller (davem@caip.rutgers.edu), 1995
31 */
32
33#include <linux/pagemap.h>
34#include <linux/quotaops.h>
35#include "ext2.h"
36#include "xattr.h"
37#include "acl.h"
38#include "xip.h"
39
40static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
41{
42 int err = ext2_add_link(dentry, inode);
43 if (!err) {
44 d_instantiate(dentry, inode);
45 unlock_new_inode(inode);
46 return 0;
47 }
48 inode_dec_link_count(inode);
49 unlock_new_inode(inode);
50 iput(inode);
51 return err;
52}
53
54/*
55 * Methods themselves.
56 */
57
58static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
59{
60 struct inode * inode;
61 ino_t ino;
62
63 if (dentry->d_name.len > EXT2_NAME_LEN)
64 return ERR_PTR(-ENAMETOOLONG);
65
66 ino = ext2_inode_by_name(dir, &dentry->d_name);
67 inode = NULL;
68 if (ino) {
69 inode = ext2_iget(dir->i_sb, ino);
70 if (inode == ERR_PTR(-ESTALE)) {
71 ext2_error(dir->i_sb, __func__,
72 "deleted inode referenced: %lu",
73 (unsigned long) ino);
74 return ERR_PTR(-EIO);
75 }
76 }
77 return d_splice_alias(inode, dentry);
78}
79
80struct dentry *ext2_get_parent(struct dentry *child)
81{
82 struct qstr dotdot = {.name = "..", .len = 2};
83 unsigned long ino = ext2_inode_by_name(child->d_inode, &dotdot);
84 if (!ino)
85 return ERR_PTR(-ENOENT);
86 return d_obtain_alias(ext2_iget(child->d_inode->i_sb, ino));
87}
88
89/*
90 * By the time this is called, we already have created
91 * the directory cache entry for the new file, but it
92 * is so far negative - it has no inode.
93 *
94 * If the create succeeds, we fill in the inode information
95 * with d_instantiate().
96 */
97static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
98{
99 struct inode *inode;
100
101 dquot_initialize(dir);
102
103 inode = ext2_new_inode(dir, mode, &dentry->d_name);
104 if (IS_ERR(inode))
105 return PTR_ERR(inode);
106
107 inode->i_op = &ext2_file_inode_operations;
108 if (ext2_use_xip(inode->i_sb)) {
109 inode->i_mapping->a_ops = &ext2_aops_xip;
110 inode->i_fop = &ext2_xip_file_operations;
111 } else if (test_opt(inode->i_sb, NOBH)) {
112 inode->i_mapping->a_ops = &ext2_nobh_aops;
113 inode->i_fop = &ext2_file_operations;
114 } else {
115 inode->i_mapping->a_ops = &ext2_aops;
116 inode->i_fop = &ext2_file_operations;
117 }
118 mark_inode_dirty(inode);
119 return ext2_add_nondir(dentry, inode);
120}
121
122static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
123{
124 struct inode * inode;
125 int err;
126
127 if (!new_valid_dev(rdev))
128 return -EINVAL;
129
130 dquot_initialize(dir);
131
132 inode = ext2_new_inode (dir, mode, &dentry->d_name);
133 err = PTR_ERR(inode);
134 if (!IS_ERR(inode)) {
135 init_special_inode(inode, inode->i_mode, rdev);
136#ifdef CONFIG_EXT2_FS_XATTR
137 inode->i_op = &ext2_special_inode_operations;
138#endif
139 mark_inode_dirty(inode);
140 err = ext2_add_nondir(dentry, inode);
141 }
142 return err;
143}
144
145static int ext2_symlink (struct inode * dir, struct dentry * dentry,
146 const char * symname)
147{
148 struct super_block * sb = dir->i_sb;
149 int err = -ENAMETOOLONG;
150 unsigned l = strlen(symname)+1;
151 struct inode * inode;
152
153 if (l > sb->s_blocksize)
154 goto out;
155
156 dquot_initialize(dir);
157
158 inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
159 err = PTR_ERR(inode);
160 if (IS_ERR(inode))
161 goto out;
162
163 if (l > sizeof (EXT2_I(inode)->i_data)) {
164 /* slow symlink */
165 inode->i_op = &ext2_symlink_inode_operations;
166 if (test_opt(inode->i_sb, NOBH))
167 inode->i_mapping->a_ops = &ext2_nobh_aops;
168 else
169 inode->i_mapping->a_ops = &ext2_aops;
170 err = page_symlink(inode, symname, l);
171 if (err)
172 goto out_fail;
173 } else {
174 /* fast symlink */
175 inode->i_op = &ext2_fast_symlink_inode_operations;
176 memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
177 inode->i_size = l-1;
178 }
179 mark_inode_dirty(inode);
180
181 err = ext2_add_nondir(dentry, inode);
182out:
183 return err;
184
185out_fail:
186 inode_dec_link_count(inode);
187 unlock_new_inode(inode);
188 iput (inode);
189 goto out;
190}
191
192static int ext2_link (struct dentry * old_dentry, struct inode * dir,
193 struct dentry *dentry)
194{
195 struct inode *inode = old_dentry->d_inode;
196 int err;
197
198 if (inode->i_nlink >= EXT2_LINK_MAX)
199 return -EMLINK;
200
201 dquot_initialize(dir);
202
203 inode->i_ctime = CURRENT_TIME_SEC;
204 inode_inc_link_count(inode);
205 ihold(inode);
206
207 err = ext2_add_link(dentry, inode);
208 if (!err) {
209 d_instantiate(dentry, inode);
210 return 0;
211 }
212 inode_dec_link_count(inode);
213 iput(inode);
214 return err;
215}
216
217static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
218{
219 struct inode * inode;
220 int err = -EMLINK;
221
222 if (dir->i_nlink >= EXT2_LINK_MAX)
223 goto out;
224
225 dquot_initialize(dir);
226
227 inode_inc_link_count(dir);
228
229 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
230 err = PTR_ERR(inode);
231 if (IS_ERR(inode))
232 goto out_dir;
233
234 inode->i_op = &ext2_dir_inode_operations;
235 inode->i_fop = &ext2_dir_operations;
236 if (test_opt(inode->i_sb, NOBH))
237 inode->i_mapping->a_ops = &ext2_nobh_aops;
238 else
239 inode->i_mapping->a_ops = &ext2_aops;
240
241 inode_inc_link_count(inode);
242
243 err = ext2_make_empty(inode, dir);
244 if (err)
245 goto out_fail;
246
247 err = ext2_add_link(dentry, inode);
248 if (err)
249 goto out_fail;
250
251 d_instantiate(dentry, inode);
252 unlock_new_inode(inode);
253out:
254 return err;
255
256out_fail:
257 inode_dec_link_count(inode);
258 inode_dec_link_count(inode);
259 unlock_new_inode(inode);
260 iput(inode);
261out_dir:
262 inode_dec_link_count(dir);
263 goto out;
264}
265
266static int ext2_unlink(struct inode * dir, struct dentry *dentry)
267{
268 struct inode * inode = dentry->d_inode;
269 struct ext2_dir_entry_2 * de;
270 struct page * page;
271 int err = -ENOENT;
272
273 dquot_initialize(dir);
274
275 de = ext2_find_entry (dir, &dentry->d_name, &page);
276 if (!de)
277 goto out;
278
279 err = ext2_delete_entry (de, page);
280 if (err)
281 goto out;
282
283 inode->i_ctime = dir->i_ctime;
284 inode_dec_link_count(inode);
285 err = 0;
286out:
287 return err;
288}
289
290static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
291{
292 struct inode * inode = dentry->d_inode;
293 int err = -ENOTEMPTY;
294
295 if (ext2_empty_dir(inode)) {
296 err = ext2_unlink(dir, dentry);
297 if (!err) {
298 inode->i_size = 0;
299 inode_dec_link_count(inode);
300 inode_dec_link_count(dir);
301 }
302 }
303 return err;
304}
305
306static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
307 struct inode * new_dir, struct dentry * new_dentry )
308{
309 struct inode * old_inode = old_dentry->d_inode;
310 struct inode * new_inode = new_dentry->d_inode;
311 struct page * dir_page = NULL;
312 struct ext2_dir_entry_2 * dir_de = NULL;
313 struct page * old_page;
314 struct ext2_dir_entry_2 * old_de;
315 int err = -ENOENT;
316
317 dquot_initialize(old_dir);
318 dquot_initialize(new_dir);
319
320 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
321 if (!old_de)
322 goto out;
323
324 if (S_ISDIR(old_inode->i_mode)) {
325 err = -EIO;
326 dir_de = ext2_dotdot(old_inode, &dir_page);
327 if (!dir_de)
328 goto out_old;
329 }
330
331 if (new_inode) {
332 struct page *new_page;
333 struct ext2_dir_entry_2 *new_de;
334
335 err = -ENOTEMPTY;
336 if (dir_de && !ext2_empty_dir (new_inode))
337 goto out_dir;
338
339 err = -ENOENT;
340 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
341 if (!new_de)
342 goto out_dir;
343 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
344 new_inode->i_ctime = CURRENT_TIME_SEC;
345 if (dir_de)
346 drop_nlink(new_inode);
347 inode_dec_link_count(new_inode);
348 } else {
349 if (dir_de) {
350 err = -EMLINK;
351 if (new_dir->i_nlink >= EXT2_LINK_MAX)
352 goto out_dir;
353 }
354 err = ext2_add_link(new_dentry, old_inode);
355 if (err)
356 goto out_dir;
357 if (dir_de)
358 inode_inc_link_count(new_dir);
359 }
360
361 /*
362 * Like most other Unix systems, set the ctime for inodes on a
363 * rename.
364 */
365 old_inode->i_ctime = CURRENT_TIME_SEC;
366 mark_inode_dirty(old_inode);
367
368 ext2_delete_entry (old_de, old_page);
369
370 if (dir_de) {
371 if (old_dir != new_dir)
372 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
373 else {
374 kunmap(dir_page);
375 page_cache_release(dir_page);
376 }
377 inode_dec_link_count(old_dir);
378 }
379 return 0;
380
381
382out_dir:
383 if (dir_de) {
384 kunmap(dir_page);
385 page_cache_release(dir_page);
386 }
387out_old:
388 kunmap(old_page);
389 page_cache_release(old_page);
390out:
391 return err;
392}
393
394const struct inode_operations ext2_dir_inode_operations = {
395 .create = ext2_create,
396 .lookup = ext2_lookup,
397 .link = ext2_link,
398 .unlink = ext2_unlink,
399 .symlink = ext2_symlink,
400 .mkdir = ext2_mkdir,
401 .rmdir = ext2_rmdir,
402 .mknod = ext2_mknod,
403 .rename = ext2_rename,
404#ifdef CONFIG_EXT2_FS_XATTR
405 .setxattr = generic_setxattr,
406 .getxattr = generic_getxattr,
407 .listxattr = ext2_listxattr,
408 .removexattr = generic_removexattr,
409#endif
410 .setattr = ext2_setattr,
411 .get_acl = ext2_get_acl,
412};
413
414const struct inode_operations ext2_special_inode_operations = {
415#ifdef CONFIG_EXT2_FS_XATTR
416 .setxattr = generic_setxattr,
417 .getxattr = generic_getxattr,
418 .listxattr = ext2_listxattr,
419 .removexattr = generic_removexattr,
420#endif
421 .setattr = ext2_setattr,
422 .get_acl = ext2_get_acl,
423};