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1/*
2 * linux/fs/hpfs/namei.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * adding & removing files & directories
7 */
8#include <linux/sched.h>
9#include "hpfs_fn.h"
10
11static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
12{
13 const unsigned char *name = dentry->d_name.name;
14 unsigned len = dentry->d_name.len;
15 struct quad_buffer_head qbh0;
16 struct buffer_head *bh;
17 struct hpfs_dirent *de;
18 struct fnode *fnode;
19 struct dnode *dnode;
20 struct inode *result;
21 fnode_secno fno;
22 dnode_secno dno;
23 int r;
24 struct hpfs_dirent dee;
25 int err;
26 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
27 hpfs_lock(dir->i_sb);
28 err = -ENOSPC;
29 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
30 if (!fnode)
31 goto bail;
32 dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0);
33 if (!dnode)
34 goto bail1;
35 memset(&dee, 0, sizeof dee);
36 dee.directory = 1;
37 if (!(mode & 0222)) dee.read_only = 1;
38 /*dee.archive = 0;*/
39 dee.hidden = name[0] == '.';
40 dee.fnode = cpu_to_le32(fno);
41 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
42 result = new_inode(dir->i_sb);
43 if (!result)
44 goto bail2;
45 hpfs_init_inode(result);
46 result->i_ino = fno;
47 hpfs_i(result)->i_parent_dir = dir->i_ino;
48 hpfs_i(result)->i_dno = dno;
49 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
50 result->i_ctime.tv_nsec = 0;
51 result->i_mtime.tv_nsec = 0;
52 result->i_atime.tv_nsec = 0;
53 hpfs_i(result)->i_ea_size = 0;
54 result->i_mode |= S_IFDIR;
55 result->i_op = &hpfs_dir_iops;
56 result->i_fop = &hpfs_dir_ops;
57 result->i_blocks = 4;
58 result->i_size = 2048;
59 set_nlink(result, 2);
60 if (dee.read_only)
61 result->i_mode &= ~0222;
62
63 r = hpfs_add_dirent(dir, name, len, &dee);
64 if (r == 1)
65 goto bail3;
66 if (r == -1) {
67 err = -EEXIST;
68 goto bail3;
69 }
70 fnode->len = len;
71 memcpy(fnode->name, name, len > 15 ? 15 : len);
72 fnode->up = cpu_to_le32(dir->i_ino);
73 fnode->flags |= FNODE_dir;
74 fnode->btree.n_free_nodes = 7;
75 fnode->btree.n_used_nodes = 1;
76 fnode->btree.first_free = cpu_to_le16(0x14);
77 fnode->u.external[0].disk_secno = cpu_to_le32(dno);
78 fnode->u.external[0].file_secno = cpu_to_le32(-1);
79 dnode->root_dnode = 1;
80 dnode->up = cpu_to_le32(fno);
81 de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0);
82 de->creation_date = de->write_date = de->read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
83 if (!(mode & 0222)) de->read_only = 1;
84 de->first = de->directory = 1;
85 /*de->hidden = de->system = 0;*/
86 de->fnode = cpu_to_le32(fno);
87 mark_buffer_dirty(bh);
88 brelse(bh);
89 hpfs_mark_4buffers_dirty(&qbh0);
90 hpfs_brelse4(&qbh0);
91 inc_nlink(dir);
92 insert_inode_hash(result);
93
94 if (result->i_uid != current_fsuid() ||
95 result->i_gid != current_fsgid() ||
96 result->i_mode != (mode | S_IFDIR)) {
97 result->i_uid = current_fsuid();
98 result->i_gid = current_fsgid();
99 result->i_mode = mode | S_IFDIR;
100 hpfs_write_inode_nolock(result);
101 }
102 d_instantiate(dentry, result);
103 hpfs_unlock(dir->i_sb);
104 return 0;
105bail3:
106 iput(result);
107bail2:
108 hpfs_brelse4(&qbh0);
109 hpfs_free_dnode(dir->i_sb, dno);
110bail1:
111 brelse(bh);
112 hpfs_free_sectors(dir->i_sb, fno, 1);
113bail:
114 hpfs_unlock(dir->i_sb);
115 return err;
116}
117
118static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *nd)
119{
120 const unsigned char *name = dentry->d_name.name;
121 unsigned len = dentry->d_name.len;
122 struct inode *result = NULL;
123 struct buffer_head *bh;
124 struct fnode *fnode;
125 fnode_secno fno;
126 int r;
127 struct hpfs_dirent dee;
128 int err;
129 if ((err = hpfs_chk_name(name, &len)))
130 return err==-ENOENT ? -EINVAL : err;
131 hpfs_lock(dir->i_sb);
132 err = -ENOSPC;
133 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
134 if (!fnode)
135 goto bail;
136 memset(&dee, 0, sizeof dee);
137 if (!(mode & 0222)) dee.read_only = 1;
138 dee.archive = 1;
139 dee.hidden = name[0] == '.';
140 dee.fnode = cpu_to_le32(fno);
141 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
142
143 result = new_inode(dir->i_sb);
144 if (!result)
145 goto bail1;
146
147 hpfs_init_inode(result);
148 result->i_ino = fno;
149 result->i_mode |= S_IFREG;
150 result->i_mode &= ~0111;
151 result->i_op = &hpfs_file_iops;
152 result->i_fop = &hpfs_file_ops;
153 set_nlink(result, 1);
154 hpfs_i(result)->i_parent_dir = dir->i_ino;
155 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
156 result->i_ctime.tv_nsec = 0;
157 result->i_mtime.tv_nsec = 0;
158 result->i_atime.tv_nsec = 0;
159 hpfs_i(result)->i_ea_size = 0;
160 if (dee.read_only)
161 result->i_mode &= ~0222;
162 result->i_blocks = 1;
163 result->i_size = 0;
164 result->i_data.a_ops = &hpfs_aops;
165 hpfs_i(result)->mmu_private = 0;
166
167 r = hpfs_add_dirent(dir, name, len, &dee);
168 if (r == 1)
169 goto bail2;
170 if (r == -1) {
171 err = -EEXIST;
172 goto bail2;
173 }
174 fnode->len = len;
175 memcpy(fnode->name, name, len > 15 ? 15 : len);
176 fnode->up = cpu_to_le32(dir->i_ino);
177 mark_buffer_dirty(bh);
178 brelse(bh);
179
180 insert_inode_hash(result);
181
182 if (result->i_uid != current_fsuid() ||
183 result->i_gid != current_fsgid() ||
184 result->i_mode != (mode | S_IFREG)) {
185 result->i_uid = current_fsuid();
186 result->i_gid = current_fsgid();
187 result->i_mode = mode | S_IFREG;
188 hpfs_write_inode_nolock(result);
189 }
190 d_instantiate(dentry, result);
191 hpfs_unlock(dir->i_sb);
192 return 0;
193
194bail2:
195 iput(result);
196bail1:
197 brelse(bh);
198 hpfs_free_sectors(dir->i_sb, fno, 1);
199bail:
200 hpfs_unlock(dir->i_sb);
201 return err;
202}
203
204static int hpfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
205{
206 const unsigned char *name = dentry->d_name.name;
207 unsigned len = dentry->d_name.len;
208 struct buffer_head *bh;
209 struct fnode *fnode;
210 fnode_secno fno;
211 int r;
212 struct hpfs_dirent dee;
213 struct inode *result = NULL;
214 int err;
215 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
216 if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
217 if (!new_valid_dev(rdev))
218 return -EINVAL;
219 hpfs_lock(dir->i_sb);
220 err = -ENOSPC;
221 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
222 if (!fnode)
223 goto bail;
224 memset(&dee, 0, sizeof dee);
225 if (!(mode & 0222)) dee.read_only = 1;
226 dee.archive = 1;
227 dee.hidden = name[0] == '.';
228 dee.fnode = cpu_to_le32(fno);
229 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
230
231 result = new_inode(dir->i_sb);
232 if (!result)
233 goto bail1;
234
235 hpfs_init_inode(result);
236 result->i_ino = fno;
237 hpfs_i(result)->i_parent_dir = dir->i_ino;
238 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
239 result->i_ctime.tv_nsec = 0;
240 result->i_mtime.tv_nsec = 0;
241 result->i_atime.tv_nsec = 0;
242 hpfs_i(result)->i_ea_size = 0;
243 result->i_uid = current_fsuid();
244 result->i_gid = current_fsgid();
245 set_nlink(result, 1);
246 result->i_size = 0;
247 result->i_blocks = 1;
248 init_special_inode(result, mode, rdev);
249
250 r = hpfs_add_dirent(dir, name, len, &dee);
251 if (r == 1)
252 goto bail2;
253 if (r == -1) {
254 err = -EEXIST;
255 goto bail2;
256 }
257 fnode->len = len;
258 memcpy(fnode->name, name, len > 15 ? 15 : len);
259 fnode->up = cpu_to_le32(dir->i_ino);
260 mark_buffer_dirty(bh);
261
262 insert_inode_hash(result);
263
264 hpfs_write_inode_nolock(result);
265 d_instantiate(dentry, result);
266 brelse(bh);
267 hpfs_unlock(dir->i_sb);
268 return 0;
269bail2:
270 iput(result);
271bail1:
272 brelse(bh);
273 hpfs_free_sectors(dir->i_sb, fno, 1);
274bail:
275 hpfs_unlock(dir->i_sb);
276 return err;
277}
278
279static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink)
280{
281 const unsigned char *name = dentry->d_name.name;
282 unsigned len = dentry->d_name.len;
283 struct buffer_head *bh;
284 struct fnode *fnode;
285 fnode_secno fno;
286 int r;
287 struct hpfs_dirent dee;
288 struct inode *result;
289 int err;
290 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
291 hpfs_lock(dir->i_sb);
292 if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
293 hpfs_unlock(dir->i_sb);
294 return -EPERM;
295 }
296 err = -ENOSPC;
297 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
298 if (!fnode)
299 goto bail;
300 memset(&dee, 0, sizeof dee);
301 dee.archive = 1;
302 dee.hidden = name[0] == '.';
303 dee.fnode = cpu_to_le32(fno);
304 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
305
306 result = new_inode(dir->i_sb);
307 if (!result)
308 goto bail1;
309 result->i_ino = fno;
310 hpfs_init_inode(result);
311 hpfs_i(result)->i_parent_dir = dir->i_ino;
312 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
313 result->i_ctime.tv_nsec = 0;
314 result->i_mtime.tv_nsec = 0;
315 result->i_atime.tv_nsec = 0;
316 hpfs_i(result)->i_ea_size = 0;
317 result->i_mode = S_IFLNK | 0777;
318 result->i_uid = current_fsuid();
319 result->i_gid = current_fsgid();
320 result->i_blocks = 1;
321 set_nlink(result, 1);
322 result->i_size = strlen(symlink);
323 result->i_op = &page_symlink_inode_operations;
324 result->i_data.a_ops = &hpfs_symlink_aops;
325
326 r = hpfs_add_dirent(dir, name, len, &dee);
327 if (r == 1)
328 goto bail2;
329 if (r == -1) {
330 err = -EEXIST;
331 goto bail2;
332 }
333 fnode->len = len;
334 memcpy(fnode->name, name, len > 15 ? 15 : len);
335 fnode->up = cpu_to_le32(dir->i_ino);
336 hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink));
337 mark_buffer_dirty(bh);
338 brelse(bh);
339
340 insert_inode_hash(result);
341
342 hpfs_write_inode_nolock(result);
343 d_instantiate(dentry, result);
344 hpfs_unlock(dir->i_sb);
345 return 0;
346bail2:
347 iput(result);
348bail1:
349 brelse(bh);
350 hpfs_free_sectors(dir->i_sb, fno, 1);
351bail:
352 hpfs_unlock(dir->i_sb);
353 return err;
354}
355
356static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
357{
358 const unsigned char *name = dentry->d_name.name;
359 unsigned len = dentry->d_name.len;
360 struct quad_buffer_head qbh;
361 struct hpfs_dirent *de;
362 struct inode *inode = dentry->d_inode;
363 dnode_secno dno;
364 int r;
365 int rep = 0;
366 int err;
367
368 hpfs_lock(dir->i_sb);
369 hpfs_adjust_length(name, &len);
370again:
371 err = -ENOENT;
372 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
373 if (!de)
374 goto out;
375
376 err = -EPERM;
377 if (de->first)
378 goto out1;
379
380 err = -EISDIR;
381 if (de->directory)
382 goto out1;
383
384 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
385 switch (r) {
386 case 1:
387 hpfs_error(dir->i_sb, "there was error when removing dirent");
388 err = -EFSERROR;
389 break;
390 case 2: /* no space for deleting, try to truncate file */
391
392 err = -ENOSPC;
393 if (rep++)
394 break;
395
396 dentry_unhash(dentry);
397 if (!d_unhashed(dentry)) {
398 hpfs_unlock(dir->i_sb);
399 return -ENOSPC;
400 }
401 if (generic_permission(inode, MAY_WRITE) ||
402 !S_ISREG(inode->i_mode) ||
403 get_write_access(inode)) {
404 d_rehash(dentry);
405 } else {
406 struct iattr newattrs;
407 /*printk("HPFS: truncating file before delete.\n");*/
408 newattrs.ia_size = 0;
409 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
410 err = notify_change(dentry, &newattrs);
411 put_write_access(inode);
412 if (!err)
413 goto again;
414 }
415 hpfs_unlock(dir->i_sb);
416 return -ENOSPC;
417 default:
418 drop_nlink(inode);
419 err = 0;
420 }
421 goto out;
422
423out1:
424 hpfs_brelse4(&qbh);
425out:
426 hpfs_unlock(dir->i_sb);
427 return err;
428}
429
430static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
431{
432 const unsigned char *name = dentry->d_name.name;
433 unsigned len = dentry->d_name.len;
434 struct quad_buffer_head qbh;
435 struct hpfs_dirent *de;
436 struct inode *inode = dentry->d_inode;
437 dnode_secno dno;
438 int n_items = 0;
439 int err;
440 int r;
441
442 hpfs_adjust_length(name, &len);
443 hpfs_lock(dir->i_sb);
444 err = -ENOENT;
445 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
446 if (!de)
447 goto out;
448
449 err = -EPERM;
450 if (de->first)
451 goto out1;
452
453 err = -ENOTDIR;
454 if (!de->directory)
455 goto out1;
456
457 hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items);
458 err = -ENOTEMPTY;
459 if (n_items)
460 goto out1;
461
462 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
463 switch (r) {
464 case 1:
465 hpfs_error(dir->i_sb, "there was error when removing dirent");
466 err = -EFSERROR;
467 break;
468 case 2:
469 err = -ENOSPC;
470 break;
471 default:
472 drop_nlink(dir);
473 clear_nlink(inode);
474 err = 0;
475 }
476 goto out;
477out1:
478 hpfs_brelse4(&qbh);
479out:
480 hpfs_unlock(dir->i_sb);
481 return err;
482}
483
484static int hpfs_symlink_readpage(struct file *file, struct page *page)
485{
486 char *link = kmap(page);
487 struct inode *i = page->mapping->host;
488 struct fnode *fnode;
489 struct buffer_head *bh;
490 int err;
491
492 err = -EIO;
493 hpfs_lock(i->i_sb);
494 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
495 goto fail;
496 err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
497 brelse(bh);
498 if (err)
499 goto fail;
500 hpfs_unlock(i->i_sb);
501 SetPageUptodate(page);
502 kunmap(page);
503 unlock_page(page);
504 return 0;
505
506fail:
507 hpfs_unlock(i->i_sb);
508 SetPageError(page);
509 kunmap(page);
510 unlock_page(page);
511 return err;
512}
513
514const struct address_space_operations hpfs_symlink_aops = {
515 .readpage = hpfs_symlink_readpage
516};
517
518static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
519 struct inode *new_dir, struct dentry *new_dentry)
520{
521 const unsigned char *old_name = old_dentry->d_name.name;
522 unsigned old_len = old_dentry->d_name.len;
523 const unsigned char *new_name = new_dentry->d_name.name;
524 unsigned new_len = new_dentry->d_name.len;
525 struct inode *i = old_dentry->d_inode;
526 struct inode *new_inode = new_dentry->d_inode;
527 struct quad_buffer_head qbh, qbh1;
528 struct hpfs_dirent *dep, *nde;
529 struct hpfs_dirent de;
530 dnode_secno dno;
531 int r;
532 struct buffer_head *bh;
533 struct fnode *fnode;
534 int err;
535
536 if ((err = hpfs_chk_name(new_name, &new_len))) return err;
537 err = 0;
538 hpfs_adjust_length(old_name, &old_len);
539
540 hpfs_lock(i->i_sb);
541 /* order doesn't matter, due to VFS exclusion */
542
543 /* Erm? Moving over the empty non-busy directory is perfectly legal */
544 if (new_inode && S_ISDIR(new_inode->i_mode)) {
545 err = -EINVAL;
546 goto end1;
547 }
548
549 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
550 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed");
551 err = -ENOENT;
552 goto end1;
553 }
554 copy_de(&de, dep);
555 de.hidden = new_name[0] == '.';
556
557 if (new_inode) {
558 int r;
559 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) {
560 if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) {
561 clear_nlink(new_inode);
562 copy_de(nde, &de);
563 memcpy(nde->name, new_name, new_len);
564 hpfs_mark_4buffers_dirty(&qbh1);
565 hpfs_brelse4(&qbh1);
566 goto end;
567 }
568 hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent");
569 err = -EFSERROR;
570 goto end1;
571 }
572 err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0;
573 goto end1;
574 }
575
576 if (new_dir == old_dir) hpfs_brelse4(&qbh);
577
578 if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) {
579 if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!");
580 err = r == 1 ? -ENOSPC : -EFSERROR;
581 if (new_dir != old_dir) hpfs_brelse4(&qbh);
582 goto end1;
583 }
584
585 if (new_dir == old_dir)
586 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
587 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2");
588 err = -ENOENT;
589 goto end1;
590 }
591
592 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) {
593 hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent");
594 err = r == 2 ? -ENOSPC : -EFSERROR;
595 goto end1;
596 }
597
598 end:
599 hpfs_i(i)->i_parent_dir = new_dir->i_ino;
600 if (S_ISDIR(i->i_mode)) {
601 inc_nlink(new_dir);
602 drop_nlink(old_dir);
603 }
604 if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
605 fnode->up = cpu_to_le32(new_dir->i_ino);
606 fnode->len = new_len;
607 memcpy(fnode->name, new_name, new_len>15?15:new_len);
608 if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len);
609 mark_buffer_dirty(bh);
610 brelse(bh);
611 }
612end1:
613 hpfs_unlock(i->i_sb);
614 return err;
615}
616
617const struct inode_operations hpfs_dir_iops =
618{
619 .create = hpfs_create,
620 .lookup = hpfs_lookup,
621 .unlink = hpfs_unlink,
622 .symlink = hpfs_symlink,
623 .mkdir = hpfs_mkdir,
624 .rmdir = hpfs_rmdir,
625 .mknod = hpfs_mknod,
626 .rename = hpfs_rename,
627 .setattr = hpfs_setattr,
628};