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30#include <linux/time.h>
31#include <linux/fs.h>
32#include <linux/smp_lock.h>
33
34#include "ufs_fs.h"
35#include "ufs.h"
36#include "util.h"
37
38static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
39{
40 int err = ufs_add_link(dentry, inode);
41 if (!err) {
42 d_instantiate(dentry, inode);
43 return 0;
44 }
45 inode_dec_link_count(inode);
46 iput(inode);
47 return err;
48}
49
50static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
51{
52 struct inode * inode = NULL;
53 ino_t ino;
54
55 if (dentry->d_name.len > UFS_MAXNAMLEN)
56 return ERR_PTR(-ENAMETOOLONG);
57
58 lock_kernel();
59 ino = ufs_inode_by_name(dir, dentry);
60 if (ino) {
61 inode = ufs_iget(dir->i_sb, ino);
62 if (IS_ERR(inode)) {
63 unlock_kernel();
64 return ERR_CAST(inode);
65 }
66 }
67 unlock_kernel();
68 d_add(dentry, inode);
69 return NULL;
70}
71
72
73
74
75
76
77
78
79
80static int ufs_create (struct inode * dir, struct dentry * dentry, int mode,
81 struct nameidata *nd)
82{
83 struct inode *inode;
84 int err;
85
86 UFSD("BEGIN\n");
87 inode = ufs_new_inode(dir, mode);
88 err = PTR_ERR(inode);
89
90 if (!IS_ERR(inode)) {
91 inode->i_op = &ufs_file_inode_operations;
92 inode->i_fop = &ufs_file_operations;
93 inode->i_mapping->a_ops = &ufs_aops;
94 mark_inode_dirty(inode);
95 lock_kernel();
96 err = ufs_add_nondir(dentry, inode);
97 unlock_kernel();
98 }
99 UFSD("END: err=%d\n", err);
100 return err;
101}
102
103static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
104{
105 struct inode *inode;
106 int err;
107
108 if (!old_valid_dev(rdev))
109 return -EINVAL;
110 inode = ufs_new_inode(dir, mode);
111 err = PTR_ERR(inode);
112 if (!IS_ERR(inode)) {
113 init_special_inode(inode, mode, rdev);
114 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
115 mark_inode_dirty(inode);
116 lock_kernel();
117 err = ufs_add_nondir(dentry, inode);
118 unlock_kernel();
119 }
120 return err;
121}
122
123static int ufs_symlink (struct inode * dir, struct dentry * dentry,
124 const char * symname)
125{
126 struct super_block * sb = dir->i_sb;
127 int err = -ENAMETOOLONG;
128 unsigned l = strlen(symname)+1;
129 struct inode * inode;
130
131 if (l > sb->s_blocksize)
132 goto out_notlocked;
133
134 lock_kernel();
135 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
136 err = PTR_ERR(inode);
137 if (IS_ERR(inode))
138 goto out;
139
140 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
141
142 inode->i_op = &page_symlink_inode_operations;
143 inode->i_mapping->a_ops = &ufs_aops;
144 err = page_symlink(inode, symname, l);
145 if (err)
146 goto out_fail;
147 } else {
148
149 inode->i_op = &ufs_fast_symlink_inode_operations;
150 memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l);
151 inode->i_size = l-1;
152 }
153 mark_inode_dirty(inode);
154
155 err = ufs_add_nondir(dentry, inode);
156out:
157 unlock_kernel();
158out_notlocked:
159 return err;
160
161out_fail:
162 inode_dec_link_count(inode);
163 iput(inode);
164 goto out;
165}
166
167static int ufs_link (struct dentry * old_dentry, struct inode * dir,
168 struct dentry *dentry)
169{
170 struct inode *inode = old_dentry->d_inode;
171 int error;
172
173 lock_kernel();
174 if (inode->i_nlink >= UFS_LINK_MAX) {
175 unlock_kernel();
176 return -EMLINK;
177 }
178
179 inode->i_ctime = CURRENT_TIME_SEC;
180 inode_inc_link_count(inode);
181 atomic_inc(&inode->i_count);
182
183 error = ufs_add_nondir(dentry, inode);
184 unlock_kernel();
185 return error;
186}
187
188static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
189{
190 struct inode * inode;
191 int err = -EMLINK;
192
193 if (dir->i_nlink >= UFS_LINK_MAX)
194 goto out;
195
196 lock_kernel();
197 inode_inc_link_count(dir);
198
199 inode = ufs_new_inode(dir, S_IFDIR|mode);
200 err = PTR_ERR(inode);
201 if (IS_ERR(inode))
202 goto out_dir;
203
204 inode->i_op = &ufs_dir_inode_operations;
205 inode->i_fop = &ufs_dir_operations;
206 inode->i_mapping->a_ops = &ufs_aops;
207
208 inode_inc_link_count(inode);
209
210 err = ufs_make_empty(inode, dir);
211 if (err)
212 goto out_fail;
213
214 err = ufs_add_link(dentry, inode);
215 if (err)
216 goto out_fail;
217 unlock_kernel();
218
219 d_instantiate(dentry, inode);
220out:
221 return err;
222
223out_fail:
224 inode_dec_link_count(inode);
225 inode_dec_link_count(inode);
226 iput (inode);
227out_dir:
228 inode_dec_link_count(dir);
229 unlock_kernel();
230 goto out;
231}
232
233static int ufs_unlink(struct inode *dir, struct dentry *dentry)
234{
235 struct inode * inode = dentry->d_inode;
236 struct ufs_dir_entry *de;
237 struct page *page;
238 int err = -ENOENT;
239
240 de = ufs_find_entry(dir, dentry, &page);
241 if (!de)
242 goto out;
243
244 err = ufs_delete_entry(dir, de, page);
245 if (err)
246 goto out;
247
248 inode->i_ctime = dir->i_ctime;
249 inode_dec_link_count(inode);
250 err = 0;
251out:
252 return err;
253}
254
255static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
256{
257 struct inode * inode = dentry->d_inode;
258 int err= -ENOTEMPTY;
259
260 lock_kernel();
261 if (ufs_empty_dir (inode)) {
262 err = ufs_unlink(dir, dentry);
263 if (!err) {
264 inode->i_size = 0;
265 inode_dec_link_count(inode);
266 inode_dec_link_count(dir);
267 }
268 }
269 unlock_kernel();
270 return err;
271}
272
273static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
274 struct inode *new_dir, struct dentry *new_dentry)
275{
276 struct inode *old_inode = old_dentry->d_inode;
277 struct inode *new_inode = new_dentry->d_inode;
278 struct page *dir_page = NULL;
279 struct ufs_dir_entry * dir_de = NULL;
280 struct page *old_page;
281 struct ufs_dir_entry *old_de;
282 int err = -ENOENT;
283
284 old_de = ufs_find_entry(old_dir, old_dentry, &old_page);
285 if (!old_de)
286 goto out;
287
288 if (S_ISDIR(old_inode->i_mode)) {
289 err = -EIO;
290 dir_de = ufs_dotdot(old_inode, &dir_page);
291 if (!dir_de)
292 goto out_old;
293 }
294
295 if (new_inode) {
296 struct page *new_page;
297 struct ufs_dir_entry *new_de;
298
299 err = -ENOTEMPTY;
300 if (dir_de && !ufs_empty_dir(new_inode))
301 goto out_dir;
302
303 err = -ENOENT;
304 new_de = ufs_find_entry(new_dir, new_dentry, &new_page);
305 if (!new_de)
306 goto out_dir;
307 inode_inc_link_count(old_inode);
308 ufs_set_link(new_dir, new_de, new_page, old_inode);
309 new_inode->i_ctime = CURRENT_TIME_SEC;
310 if (dir_de)
311 drop_nlink(new_inode);
312 inode_dec_link_count(new_inode);
313 } else {
314 if (dir_de) {
315 err = -EMLINK;
316 if (new_dir->i_nlink >= UFS_LINK_MAX)
317 goto out_dir;
318 }
319 inode_inc_link_count(old_inode);
320 err = ufs_add_link(new_dentry, old_inode);
321 if (err) {
322 inode_dec_link_count(old_inode);
323 goto out_dir;
324 }
325 if (dir_de)
326 inode_inc_link_count(new_dir);
327 }
328
329
330
331
332
333
334 old_inode->i_ctime = CURRENT_TIME_SEC;
335
336 ufs_delete_entry(old_dir, old_de, old_page);
337 inode_dec_link_count(old_inode);
338
339 if (dir_de) {
340 ufs_set_link(old_inode, dir_de, dir_page, new_dir);
341 inode_dec_link_count(old_dir);
342 }
343 return 0;
344
345
346out_dir:
347 if (dir_de) {
348 kunmap(dir_page);
349 page_cache_release(dir_page);
350 }
351out_old:
352 kunmap(old_page);
353 page_cache_release(old_page);
354out:
355 return err;
356}
357
358const struct inode_operations ufs_dir_inode_operations = {
359 .create = ufs_create,
360 .lookup = ufs_lookup,
361 .link = ufs_link,
362 .unlink = ufs_unlink,
363 .symlink = ufs_symlink,
364 .mkdir = ufs_mkdir,
365 .rmdir = ufs_rmdir,
366 .mknod = ufs_mknod,
367 .rename = ufs_rename,
368};
369
