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-rw-r--r--fs/ufs/namei.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
new file mode 100644
index 000000000000..2958cde7d3d6
--- /dev/null
+++ b/fs/ufs/namei.c
@@ -0,0 +1,375 @@
1/*
2 * linux/fs/ufs/namei.c
3 *
4 * Copyright (C) 1998
5 * Daniel Pirkl <daniel.pirkl@email.cz>
6 * Charles University, Faculty of Mathematics and Physics
7 *
8 * from
9 *
10 * linux/fs/ext2/namei.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/namei.c
20 *
21 * Copyright (C) 1991, 1992 Linus Torvalds
22 *
23 * Big-endian to little-endian byte-swapping/bitmaps by
24 * David S. Miller (davem@caip.rutgers.edu), 1995
25 */
26
27#include <linux/time.h>
28#include <linux/fs.h>
29#include <linux/ufs_fs.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
32#include "swab.h" /* will go away - see comment in mknod() */
33#include "util.h"
34
35/*
36#undef UFS_NAMEI_DEBUG
37*/
38#define UFS_NAMEI_DEBUG
39
40#ifdef UFS_NAMEI_DEBUG
41#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
42#else
43#define UFSD(x)
44#endif
45
46static inline void ufs_inc_count(struct inode *inode)
47{
48 inode->i_nlink++;
49 mark_inode_dirty(inode);
50}
51
52static inline void ufs_dec_count(struct inode *inode)
53{
54 inode->i_nlink--;
55 mark_inode_dirty(inode);
56}
57
58static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
59{
60 int err = ufs_add_link(dentry, inode);
61 if (!err) {
62 d_instantiate(dentry, inode);
63 return 0;
64 }
65 ufs_dec_count(inode);
66 iput(inode);
67 return err;
68}
69
70static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
71{
72 struct inode * inode = NULL;
73 ino_t ino;
74
75 if (dentry->d_name.len > UFS_MAXNAMLEN)
76 return ERR_PTR(-ENAMETOOLONG);
77
78 lock_kernel();
79 ino = ufs_inode_by_name(dir, dentry);
80 if (ino) {
81 inode = iget(dir->i_sb, ino);
82 if (!inode) {
83 unlock_kernel();
84 return ERR_PTR(-EACCES);
85 }
86 }
87 unlock_kernel();
88 d_add(dentry, inode);
89 return NULL;
90}
91
92/*
93 * By the time this is called, we already have created
94 * the directory cache entry for the new file, but it
95 * is so far negative - it has no inode.
96 *
97 * If the create succeeds, we fill in the inode information
98 * with d_instantiate().
99 */
100static int ufs_create (struct inode * dir, struct dentry * dentry, int mode,
101 struct nameidata *nd)
102{
103 struct inode * inode = ufs_new_inode(dir, mode);
104 int err = PTR_ERR(inode);
105 if (!IS_ERR(inode)) {
106 inode->i_op = &ufs_file_inode_operations;
107 inode->i_fop = &ufs_file_operations;
108 inode->i_mapping->a_ops = &ufs_aops;
109 mark_inode_dirty(inode);
110 lock_kernel();
111 err = ufs_add_nondir(dentry, inode);
112 unlock_kernel();
113 }
114 return err;
115}
116
117static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
118{
119 struct inode *inode;
120 int err;
121
122 if (!old_valid_dev(rdev))
123 return -EINVAL;
124 inode = ufs_new_inode(dir, mode);
125 err = PTR_ERR(inode);
126 if (!IS_ERR(inode)) {
127 init_special_inode(inode, mode, rdev);
128 /* NOTE: that'll go when we get wide dev_t */
129 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
130 mark_inode_dirty(inode);
131 lock_kernel();
132 err = ufs_add_nondir(dentry, inode);
133 unlock_kernel();
134 }
135 return err;
136}
137
138static int ufs_symlink (struct inode * dir, struct dentry * dentry,
139 const char * symname)
140{
141 struct super_block * sb = dir->i_sb;
142 int err = -ENAMETOOLONG;
143 unsigned l = strlen(symname)+1;
144 struct inode * inode;
145
146 if (l > sb->s_blocksize)
147 goto out;
148
149 lock_kernel();
150 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
151 err = PTR_ERR(inode);
152 if (IS_ERR(inode))
153 goto out;
154
155 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
156 /* slow symlink */
157 inode->i_op = &page_symlink_inode_operations;
158 inode->i_mapping->a_ops = &ufs_aops;
159 err = page_symlink(inode, symname, l);
160 if (err)
161 goto out_fail;
162 } else {
163 /* fast symlink */
164 inode->i_op = &ufs_fast_symlink_inode_operations;
165 memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l);
166 inode->i_size = l-1;
167 }
168 mark_inode_dirty(inode);
169
170 err = ufs_add_nondir(dentry, inode);
171out:
172 unlock_kernel();
173 return err;
174
175out_fail:
176 ufs_dec_count(inode);
177 iput(inode);
178 goto out;
179}
180
181static int ufs_link (struct dentry * old_dentry, struct inode * dir,
182 struct dentry *dentry)
183{
184 struct inode *inode = old_dentry->d_inode;
185 int error;
186
187 lock_kernel();
188 if (inode->i_nlink >= UFS_LINK_MAX) {
189 unlock_kernel();
190 return -EMLINK;
191 }
192
193 inode->i_ctime = CURRENT_TIME_SEC;
194 ufs_inc_count(inode);
195 atomic_inc(&inode->i_count);
196
197 error = ufs_add_nondir(dentry, inode);
198 unlock_kernel();
199 return error;
200}
201
202static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
203{
204 struct inode * inode;
205 int err = -EMLINK;
206
207 if (dir->i_nlink >= UFS_LINK_MAX)
208 goto out;
209
210 lock_kernel();
211 ufs_inc_count(dir);
212
213 inode = ufs_new_inode(dir, S_IFDIR|mode);
214 err = PTR_ERR(inode);
215 if (IS_ERR(inode))
216 goto out_dir;
217
218 inode->i_op = &ufs_dir_inode_operations;
219 inode->i_fop = &ufs_dir_operations;
220
221 ufs_inc_count(inode);
222
223 err = ufs_make_empty(inode, dir);
224 if (err)
225 goto out_fail;
226
227 err = ufs_add_link(dentry, inode);
228 if (err)
229 goto out_fail;
230 unlock_kernel();
231
232 d_instantiate(dentry, inode);
233out:
234 return err;
235
236out_fail:
237 ufs_dec_count(inode);
238 ufs_dec_count(inode);
239 iput (inode);
240out_dir:
241 ufs_dec_count(dir);
242 unlock_kernel();
243 goto out;
244}
245
246static int ufs_unlink(struct inode * dir, struct dentry *dentry)
247{
248 struct inode * inode = dentry->d_inode;
249 struct buffer_head * bh;
250 struct ufs_dir_entry * de;
251 int err = -ENOENT;
252
253 lock_kernel();
254 de = ufs_find_entry (dentry, &bh);
255 if (!de)
256 goto out;
257
258 err = ufs_delete_entry (dir, de, bh);
259 if (err)
260 goto out;
261
262 inode->i_ctime = dir->i_ctime;
263 ufs_dec_count(inode);
264 err = 0;
265out:
266 unlock_kernel();
267 return err;
268}
269
270static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
271{
272 struct inode * inode = dentry->d_inode;
273 int err= -ENOTEMPTY;
274
275 lock_kernel();
276 if (ufs_empty_dir (inode)) {
277 err = ufs_unlink(dir, dentry);
278 if (!err) {
279 inode->i_size = 0;
280 ufs_dec_count(inode);
281 ufs_dec_count(dir);
282 }
283 }
284 unlock_kernel();
285 return err;
286}
287
288static int ufs_rename (struct inode * old_dir, struct dentry * old_dentry,
289 struct inode * new_dir, struct dentry * new_dentry )
290{
291 struct inode *old_inode = old_dentry->d_inode;
292 struct inode *new_inode = new_dentry->d_inode;
293 struct buffer_head *dir_bh = NULL;
294 struct ufs_dir_entry *dir_de = NULL;
295 struct buffer_head *old_bh;
296 struct ufs_dir_entry *old_de;
297 int err = -ENOENT;
298
299 lock_kernel();
300 old_de = ufs_find_entry (old_dentry, &old_bh);
301 if (!old_de)
302 goto out;
303
304 if (S_ISDIR(old_inode->i_mode)) {
305 err = -EIO;
306 dir_de = ufs_dotdot(old_inode, &dir_bh);
307 if (!dir_de)
308 goto out_old;
309 }
310
311 if (new_inode) {
312 struct buffer_head *new_bh;
313 struct ufs_dir_entry *new_de;
314
315 err = -ENOTEMPTY;
316 if (dir_de && !ufs_empty_dir (new_inode))
317 goto out_dir;
318 err = -ENOENT;
319 new_de = ufs_find_entry (new_dentry, &new_bh);
320 if (!new_de)
321 goto out_dir;
322 ufs_inc_count(old_inode);
323 ufs_set_link(new_dir, new_de, new_bh, old_inode);
324 new_inode->i_ctime = CURRENT_TIME_SEC;
325 if (dir_de)
326 new_inode->i_nlink--;
327 ufs_dec_count(new_inode);
328 } else {
329 if (dir_de) {
330 err = -EMLINK;
331 if (new_dir->i_nlink >= UFS_LINK_MAX)
332 goto out_dir;
333 }
334 ufs_inc_count(old_inode);
335 err = ufs_add_link(new_dentry, old_inode);
336 if (err) {
337 ufs_dec_count(old_inode);
338 goto out_dir;
339 }
340 if (dir_de)
341 ufs_inc_count(new_dir);
342 }
343
344 ufs_delete_entry (old_dir, old_de, old_bh);
345
346 ufs_dec_count(old_inode);
347
348 if (dir_de) {
349 ufs_set_link(old_inode, dir_de, dir_bh, new_dir);
350 ufs_dec_count(old_dir);
351 }
352 unlock_kernel();
353 return 0;
354
355out_dir:
356 if (dir_de)
357 brelse(dir_bh);
358out_old:
359 brelse (old_bh);
360out:
361 unlock_kernel();
362 return err;
363}
364
365struct inode_operations ufs_dir_inode_operations = {
366 .create = ufs_create,
367 .lookup = ufs_lookup,
368 .link = ufs_link,
369 .unlink = ufs_unlink,
370 .symlink = ufs_symlink,
371 .mkdir = ufs_mkdir,
372 .rmdir = ufs_rmdir,
373 .mknod = ufs_mknod,
374 .rename = ufs_rename,
375};
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-31 21:06:15 -0400