blob: 4890ddf1518e347a45ef00bc451b55891022ff10 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ufs/ufs_dir.c
3 *
4 * Copyright (C) 1996
5 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
6 * Laboratory for Computer Science Research Computing Facility
7 * Rutgers, The State University of New Jersey
8 *
9 * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406
10 *
11 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
12 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
13 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070014 *
15 * Migration to usage of "page cache" on May 2006 by
16 * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18
19#include <linux/time.h>
20#include <linux/fs.h>
21#include <linux/ufs_fs.h>
22#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include "swab.h"
25#include "util.h"
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027/*
28 * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
29 *
30 * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
31 */
32static inline int ufs_match(struct super_block *sb, int len,
33 const char * const name, struct ufs_dir_entry * de)
34{
35 if (len != ufs_get_de_namlen(sb, de))
36 return 0;
37 if (!de->d_ino)
38 return 0;
39 return !memcmp(name, de->d_name, len);
40}
41
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070042static int ufs_commit_chunk(struct page *page, unsigned from, unsigned to)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070044 struct inode *dir = page->mapping->host;
45 int err = 0;
46 dir->i_version++;
47 page->mapping->a_ops->commit_write(NULL, page, from, to);
48 if (IS_DIRSYNC(dir))
49 err = write_one_page(page, 1);
50 else
51 unlock_page(page);
52 return err;
53}
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070055static inline void ufs_put_page(struct page *page)
56{
57 kunmap(page);
58 page_cache_release(page);
59}
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070061static inline unsigned long ufs_dir_pages(struct inode *inode)
62{
63 return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
64}
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070066ino_t ufs_inode_by_name(struct inode *dir, struct dentry *dentry)
67{
68 ino_t res = 0;
69 struct ufs_dir_entry *de;
70 struct page *page;
71
72 de = ufs_find_entry(dir, dentry, &page);
73 if (de) {
74 res = fs32_to_cpu(dir->i_sb, de->d_ino);
75 ufs_put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070077 return res;
78}
79
80
81/* Releases the page */
82void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
83 struct page *page, struct inode *inode)
84{
85 unsigned from = (char *) de - (char *) page_address(page);
86 unsigned to = from + fs16_to_cpu(dir->i_sb, de->d_reclen);
87 int err;
88
89 lock_page(page);
90 err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
91 BUG_ON(err);
92 de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
93 ufs_set_de_type(dir->i_sb, de, inode->i_mode);
94 err = ufs_commit_chunk(page, from, to);
95 ufs_put_page(page);
96 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
97 mark_inode_dirty(dir);
98}
99
100
101static void ufs_check_page(struct page *page)
102{
103 struct inode *dir = page->mapping->host;
104 struct super_block *sb = dir->i_sb;
105 char *kaddr = page_address(page);
106 unsigned offs, rec_len;
107 unsigned limit = PAGE_CACHE_SIZE;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800108 const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700109 struct ufs_dir_entry *p;
110 char *error;
111
112 if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
113 limit = dir->i_size & ~PAGE_CACHE_MASK;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800114 if (limit & chunk_mask)
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700115 goto Ebadsize;
116 if (!limit)
117 goto out;
118 }
119 for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
120 p = (struct ufs_dir_entry *)(kaddr + offs);
121 rec_len = fs16_to_cpu(sb, p->d_reclen);
122
123 if (rec_len < UFS_DIR_REC_LEN(1))
124 goto Eshort;
125 if (rec_len & 3)
126 goto Ealign;
127 if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
128 goto Enamelen;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800129 if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700130 goto Espan;
131 if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
132 UFS_SB(sb)->s_uspi->s_ncg))
133 goto Einumber;
134 }
135 if (offs != limit)
136 goto Eend;
137out:
138 SetPageChecked(page);
139 return;
140
141 /* Too bad, we had an error */
142
143Ebadsize:
144 ufs_error(sb, "ufs_check_page",
145 "size of directory #%lu is not a multiple of chunk size",
146 dir->i_ino
147 );
148 goto fail;
149Eshort:
150 error = "rec_len is smaller than minimal";
151 goto bad_entry;
152Ealign:
153 error = "unaligned directory entry";
154 goto bad_entry;
155Enamelen:
156 error = "rec_len is too small for name_len";
157 goto bad_entry;
158Espan:
159 error = "directory entry across blocks";
160 goto bad_entry;
161Einumber:
162 error = "inode out of bounds";
163bad_entry:
164 ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
165 "offset=%lu, rec_len=%d, name_len=%d",
166 dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
167 rec_len, ufs_get_de_namlen(sb, p));
168 goto fail;
169Eend:
170 p = (struct ufs_dir_entry *)(kaddr + offs);
171 ufs_error (sb, "ext2_check_page",
172 "entry in directory #%lu spans the page boundary"
173 "offset=%lu",
174 dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs);
175fail:
176 SetPageChecked(page);
177 SetPageError(page);
178}
179
180static struct page *ufs_get_page(struct inode *dir, unsigned long n)
181{
182 struct address_space *mapping = dir->i_mapping;
183 struct page *page = read_cache_page(mapping, n,
184 (filler_t*)mapping->a_ops->readpage, NULL);
185 if (!IS_ERR(page)) {
186 wait_on_page_locked(page);
187 kmap(page);
188 if (!PageUptodate(page))
189 goto fail;
190 if (!PageChecked(page))
191 ufs_check_page(page);
192 if (PageError(page))
193 goto fail;
194 }
195 return page;
196
197fail:
198 ufs_put_page(page);
199 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
202/*
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700203 * Return the offset into page `page_nr' of the last valid
204 * byte in that page, plus one.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700206static unsigned
207ufs_last_byte(struct inode *inode, unsigned long page_nr)
208{
209 unsigned last_byte = inode->i_size;
210
211 last_byte -= page_nr << PAGE_CACHE_SHIFT;
212 if (last_byte > PAGE_CACHE_SIZE)
213 last_byte = PAGE_CACHE_SIZE;
214 return last_byte;
215}
216
217static inline struct ufs_dir_entry *
218ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
219{
220 return (struct ufs_dir_entry *)((char *)p +
221 fs16_to_cpu(sb, p->d_reclen));
222}
223
224struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
225{
226 struct page *page = ufs_get_page(dir, 0);
227 struct ufs_dir_entry *de = NULL;
228
229 if (!IS_ERR(page)) {
230 de = ufs_next_entry(dir->i_sb,
231 (struct ufs_dir_entry *)page_address(page));
232 *p = page;
233 }
234 return de;
235}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237/*
238 * ufs_find_entry()
239 *
240 * finds an entry in the specified directory with the wanted name. It
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700241 * returns the page in which the entry was found, and the entry itself
242 * (as a parameter - res_dir). Page is returned mapped and unlocked.
243 * Entry is guaranteed to be valid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700245struct ufs_dir_entry *ufs_find_entry(struct inode *dir, struct dentry *dentry,
246 struct page **res_page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
248 struct super_block *sb = dir->i_sb;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700249 const char *name = dentry->d_name.name;
250 int namelen = dentry->d_name.len;
251 unsigned reclen = UFS_DIR_REC_LEN(namelen);
252 unsigned long start, n;
253 unsigned long npages = ufs_dir_pages(dir);
254 struct page *page = NULL;
Evgeniy Dushistovdd187a22006-06-25 05:47:25 -0700255 struct ufs_inode_info *ui = UFS_I(dir);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700256 struct ufs_dir_entry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700258 UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700260 if (npages == 0 || namelen > UFS_MAXNAMLEN)
261 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700263 /* OFFSET_CACHE */
264 *res_page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Evgeniy Dushistovdd187a22006-06-25 05:47:25 -0700266 start = ui->i_dir_start_lookup;
267
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700268 if (start >= npages)
269 start = 0;
270 n = start;
271 do {
272 char *kaddr;
273 page = ufs_get_page(dir, n);
274 if (!IS_ERR(page)) {
275 kaddr = page_address(page);
276 de = (struct ufs_dir_entry *) kaddr;
277 kaddr += ufs_last_byte(dir, n) - reclen;
278 while ((char *) de <= kaddr) {
279 if (de->d_reclen == 0) {
280 ufs_error(dir->i_sb, __FUNCTION__,
281 "zero-length directory entry");
282 ufs_put_page(page);
283 goto out;
284 }
285 if (ufs_match(sb, namelen, name, de))
286 goto found;
287 de = ufs_next_entry(sb, de);
288 }
289 ufs_put_page(page);
290 }
291 if (++n >= npages)
292 n = 0;
293 } while (n != start);
294out:
295 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700297found:
298 *res_page = page;
Evgeniy Dushistovdd187a22006-06-25 05:47:25 -0700299 ui->i_dir_start_lookup = n;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700300 return de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303/*
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700304 * Parent is locked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 */
306int ufs_add_link(struct dentry *dentry, struct inode *inode)
307{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 struct inode *dir = dentry->d_parent->d_inode;
309 const char *name = dentry->d_name.name;
310 int namelen = dentry->d_name.len;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700311 struct super_block *sb = dir->i_sb;
312 unsigned reclen = UFS_DIR_REC_LEN(namelen);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800313 const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700314 unsigned short rec_len, name_len;
315 struct page *page = NULL;
316 struct ufs_dir_entry *de;
317 unsigned long npages = ufs_dir_pages(dir);
318 unsigned long n;
319 char *kaddr;
320 unsigned from, to;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 int err;
322
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700323 UFSD("ENTER, name %s, namelen %u\n", name, namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700325 /*
326 * We take care of directory expansion in the same loop.
327 * This code plays outside i_size, so it locks the page
328 * to protect that region.
329 */
330 for (n = 0; n <= npages; n++) {
331 char *dir_end;
332
333 page = ufs_get_page(dir, n);
334 err = PTR_ERR(page);
335 if (IS_ERR(page))
336 goto out;
337 lock_page(page);
338 kaddr = page_address(page);
339 dir_end = kaddr + ufs_last_byte(dir, n);
340 de = (struct ufs_dir_entry *)kaddr;
341 kaddr += PAGE_CACHE_SIZE - reclen;
342 while ((char *)de <= kaddr) {
343 if ((char *)de == dir_end) {
344 /* We hit i_size */
345 name_len = 0;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800346 rec_len = chunk_size;
347 de->d_reclen = cpu_to_fs16(sb, chunk_size);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700348 de->d_ino = 0;
349 goto got_it;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700351 if (de->d_reclen == 0) {
352 ufs_error(dir->i_sb, __FUNCTION__,
353 "zero-length directory entry");
354 err = -EIO;
355 goto out_unlock;
356 }
357 err = -EEXIST;
358 if (ufs_match(sb, namelen, name, de))
359 goto out_unlock;
360 name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
361 rec_len = fs16_to_cpu(sb, de->d_reclen);
362 if (!de->d_ino && rec_len >= reclen)
363 goto got_it;
364 if (rec_len >= name_len + reclen)
365 goto got_it;
366 de = (struct ufs_dir_entry *) ((char *) de + rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700368 unlock_page(page);
369 ufs_put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700371 BUG();
372 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700374got_it:
375 from = (char*)de - (char*)page_address(page);
376 to = from + rec_len;
377 err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
378 if (err)
379 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (de->d_ino) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700381 struct ufs_dir_entry *de1 =
382 (struct ufs_dir_entry *) ((char *) de + name_len);
383 de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
384 de->d_reclen = cpu_to_fs16(sb, name_len);
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 de = de1;
387 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 ufs_set_de_namlen(sb, de, namelen);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700390 memcpy(de->d_name, name, namelen + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 de->d_ino = cpu_to_fs32(sb, inode->i_ino);
392 ufs_set_de_type(sb, de, inode->i_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700394 err = ufs_commit_chunk(page, from, to);
395 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
396
397 mark_inode_dirty(dir);
398 /* OFFSET_CACHE */
399out_put:
400 ufs_put_page(page);
401out:
402 return err;
403out_unlock:
404 unlock_page(page);
405 goto out_put;
406}
407
408static inline unsigned
409ufs_validate_entry(struct super_block *sb, char *base,
410 unsigned offset, unsigned mask)
411{
412 struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
413 struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
414 while ((char*)p < (char*)de) {
415 if (p->d_reclen == 0)
416 break;
417 p = ufs_next_entry(sb, p);
418 }
419 return (char *)p - base;
420}
421
422
423/*
424 * This is blatantly stolen from ext2fs
425 */
426static int
427ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
428{
429 loff_t pos = filp->f_pos;
Josef Sipek763454d2006-12-08 02:37:45 -0800430 struct inode *inode = filp->f_path.dentry->d_inode;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700431 struct super_block *sb = inode->i_sb;
432 unsigned int offset = pos & ~PAGE_CACHE_MASK;
433 unsigned long n = pos >> PAGE_CACHE_SHIFT;
434 unsigned long npages = ufs_dir_pages(inode);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800435 unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700436 int need_revalidate = filp->f_version != inode->i_version;
437 unsigned flags = UFS_SB(sb)->s_flags;
438
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700439 UFSD("BEGIN\n");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700440
441 if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
442 return 0;
443
444 for ( ; n < npages; n++, offset = 0) {
445 char *kaddr, *limit;
446 struct ufs_dir_entry *de;
447
448 struct page *page = ufs_get_page(inode, n);
449
450 if (IS_ERR(page)) {
451 ufs_error(sb, __FUNCTION__,
452 "bad page in #%lu",
453 inode->i_ino);
454 filp->f_pos += PAGE_CACHE_SIZE - offset;
455 return -EIO;
456 }
457 kaddr = page_address(page);
458 if (unlikely(need_revalidate)) {
459 if (offset) {
460 offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
461 filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
462 }
463 filp->f_version = inode->i_version;
464 need_revalidate = 0;
465 }
466 de = (struct ufs_dir_entry *)(kaddr+offset);
467 limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
468 for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
469 if (de->d_reclen == 0) {
470 ufs_error(sb, __FUNCTION__,
471 "zero-length directory entry");
472 ufs_put_page(page);
473 return -EIO;
474 }
475 if (de->d_ino) {
476 int over;
477 unsigned char d_type = DT_UNKNOWN;
478
479 offset = (char *)de - kaddr;
480
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700481 UFSD("filldir(%s,%u)\n", de->d_name,
482 fs32_to_cpu(sb, de->d_ino));
483 UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700484
485 if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
486 d_type = de->d_u.d_44.d_type;
487
488 over = filldir(dirent, de->d_name,
489 ufs_get_de_namlen(sb, de),
490 (n<<PAGE_CACHE_SHIFT) | offset,
491 fs32_to_cpu(sb, de->d_ino), d_type);
492 if (over) {
493 ufs_put_page(page);
494 return 0;
495 }
496 }
497 filp->f_pos += fs16_to_cpu(sb, de->d_reclen);
498 }
499 ufs_put_page(page);
500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 return 0;
502}
503
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505/*
506 * ufs_delete_entry deletes a directory entry by merging it with the
507 * previous entry.
508 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700509int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
510 struct page * page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511{
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700512 struct super_block *sb = inode->i_sb;
513 struct address_space *mapping = page->mapping;
514 char *kaddr = page_address(page);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800515 unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700516 unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
517 struct ufs_dir_entry *pde = NULL;
518 struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
519 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700521 UFSD("ENTER\n");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700522
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700523 UFSD("ino %u, reclen %u, namlen %u, name %s\n",
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700524 fs32_to_cpu(sb, de->d_ino),
525 fs16_to_cpu(sb, de->d_reclen),
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700526 ufs_get_de_namlen(sb, de), de->d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700528 while ((char*)de < (char*)dir) {
529 if (de->d_reclen == 0) {
530 ufs_error(inode->i_sb, __FUNCTION__,
531 "zero-length directory entry");
532 err = -EIO;
533 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700535 pde = de;
536 de = ufs_next_entry(sb, de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700538 if (pde)
539 from = (char*)pde - (char*)page_address(page);
540 lock_page(page);
541 err = mapping->a_ops->prepare_write(NULL, page, from, to);
542 BUG_ON(err);
543 if (pde)
544 pde->d_reclen = cpu_to_fs16(sb, to-from);
545 dir->d_ino = 0;
546 err = ufs_commit_chunk(page, from, to);
547 inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
548 mark_inode_dirty(inode);
549out:
550 ufs_put_page(page);
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700551 UFSD("EXIT\n");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700552 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
555int ufs_make_empty(struct inode * inode, struct inode *dir)
556{
557 struct super_block * sb = dir->i_sb;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700558 struct address_space *mapping = inode->i_mapping;
559 struct page *page = grab_cache_page(mapping, 0);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800560 const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 struct ufs_dir_entry * de;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700562 char *base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 int err;
564
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700565 if (!page)
566 return -ENOMEM;
567 kmap(page);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800568 err = mapping->a_ops->prepare_write(NULL, page, 0, chunk_size);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700569 if (err) {
570 unlock_page(page);
571 goto fail;
572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700574
575 base = (char*)page_address(page);
576 memset(base, 0, PAGE_CACHE_SIZE);
577
578 de = (struct ufs_dir_entry *) base;
579
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 de->d_ino = cpu_to_fs32(sb, inode->i_ino);
581 ufs_set_de_type(sb, de, inode->i_mode);
582 ufs_set_de_namlen(sb, de, 1);
583 de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
584 strcpy (de->d_name, ".");
585 de = (struct ufs_dir_entry *)
586 ((char *)de + fs16_to_cpu(sb, de->d_reclen));
587 de->d_ino = cpu_to_fs32(sb, dir->i_ino);
588 ufs_set_de_type(sb, de, dir->i_mode);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800589 de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 ufs_set_de_namlen(sb, de, 2);
591 strcpy (de->d_name, "..");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700592
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800593 err = ufs_commit_chunk(page, 0, chunk_size);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700594fail:
595 kunmap(page);
596 page_cache_release(page);
597 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
600/*
601 * routine to check that the specified directory is empty (for rmdir)
602 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700603int ufs_empty_dir(struct inode * inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700605 struct super_block *sb = inode->i_sb;
606 struct page *page = NULL;
607 unsigned long i, npages = ufs_dir_pages(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700609 for (i = 0; i < npages; i++) {
610 char *kaddr;
611 struct ufs_dir_entry *de;
612 page = ufs_get_page(inode, i);
613
614 if (IS_ERR(page))
615 continue;
616
617 kaddr = page_address(page);
618 de = (struct ufs_dir_entry *)kaddr;
619 kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
620
621 while ((char *)de <= kaddr) {
622 if (de->d_reclen == 0) {
623 ufs_error(inode->i_sb, __FUNCTION__,
624 "zero-length directory entry: "
625 "kaddr=%p, de=%p\n", kaddr, de);
626 goto not_empty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700628 if (de->d_ino) {
629 u16 namelen=ufs_get_de_namlen(sb, de);
630 /* check for . and .. */
631 if (de->d_name[0] != '.')
632 goto not_empty;
633 if (namelen > 2)
634 goto not_empty;
635 if (namelen < 2) {
636 if (inode->i_ino !=
637 fs32_to_cpu(sb, de->d_ino))
638 goto not_empty;
639 } else if (de->d_name[1] != '.')
640 goto not_empty;
641 }
642 de = ufs_next_entry(sb, de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700644 ufs_put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 return 1;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700647
648not_empty:
649 ufs_put_page(page);
650 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651}
652
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800653const struct file_operations ufs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 .read = generic_read_dir,
655 .readdir = ufs_readdir,
656 .fsync = file_fsync,
657};