blob: 6f671f1ac27122ee1ae3a9b289958d88f39ac604 [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>
Nick Piggin82b9d1d2007-10-16 01:25:19 -070021#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Mike Frysingere5420592008-02-08 04:21:31 -080023#include "ufs_fs.h"
Christoph Hellwigbcd6d4e2007-10-16 23:26:51 -070024#include "ufs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "swab.h"
26#include "util.h"
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028/*
29 * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure.
30 *
31 * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller.
32 */
33static inline int ufs_match(struct super_block *sb, int len,
34 const char * const name, struct ufs_dir_entry * de)
35{
36 if (len != ufs_get_de_namlen(sb, de))
37 return 0;
38 if (!de->d_ino)
39 return 0;
40 return !memcmp(name, de->d_name, len);
41}
42
Nick Piggin82b9d1d2007-10-16 01:25:19 -070043static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
Nick Piggin82b9d1d2007-10-16 01:25:19 -070045 struct address_space *mapping = page->mapping;
46 struct inode *dir = mapping->host;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070047 int err = 0;
Nick Piggin82b9d1d2007-10-16 01:25:19 -070048
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070049 dir->i_version++;
Nick Piggin82b9d1d2007-10-16 01:25:19 -070050 block_write_end(NULL, mapping, pos, len, len, page, NULL);
51 if (pos+len > dir->i_size) {
52 i_size_write(dir, pos+len);
53 mark_inode_dirty(dir);
54 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070055 if (IS_DIRSYNC(dir))
56 err = write_one_page(page, 1);
57 else
58 unlock_page(page);
59 return err;
60}
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070062static inline void ufs_put_page(struct page *page)
63{
64 kunmap(page);
65 page_cache_release(page);
66}
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070068static inline unsigned long ufs_dir_pages(struct inode *inode)
69{
70 return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
71}
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070073ino_t ufs_inode_by_name(struct inode *dir, struct dentry *dentry)
74{
75 ino_t res = 0;
76 struct ufs_dir_entry *de;
77 struct page *page;
78
79 de = ufs_find_entry(dir, dentry, &page);
80 if (de) {
81 res = fs32_to_cpu(dir->i_sb, de->d_ino);
82 ufs_put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070084 return res;
85}
86
87
88/* Releases the page */
89void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de,
90 struct page *page, struct inode *inode)
91{
Nick Piggin82b9d1d2007-10-16 01:25:19 -070092 loff_t pos = page_offset(page) +
93 (char *) de - (char *) page_address(page);
94 unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -070095 int err;
96
97 lock_page(page);
Nick Piggin82b9d1d2007-10-16 01:25:19 -070098 err = __ufs_write_begin(NULL, page->mapping, pos, len,
99 AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700100 BUG_ON(err);
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700101
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700102 de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino);
103 ufs_set_de_type(dir->i_sb, de, inode->i_mode);
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700104
105 err = ufs_commit_chunk(page, pos, len);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700106 ufs_put_page(page);
107 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
108 mark_inode_dirty(dir);
109}
110
111
112static void ufs_check_page(struct page *page)
113{
114 struct inode *dir = page->mapping->host;
115 struct super_block *sb = dir->i_sb;
116 char *kaddr = page_address(page);
117 unsigned offs, rec_len;
118 unsigned limit = PAGE_CACHE_SIZE;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800119 const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700120 struct ufs_dir_entry *p;
121 char *error;
122
123 if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
124 limit = dir->i_size & ~PAGE_CACHE_MASK;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800125 if (limit & chunk_mask)
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700126 goto Ebadsize;
127 if (!limit)
128 goto out;
129 }
130 for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
131 p = (struct ufs_dir_entry *)(kaddr + offs);
132 rec_len = fs16_to_cpu(sb, p->d_reclen);
133
134 if (rec_len < UFS_DIR_REC_LEN(1))
135 goto Eshort;
136 if (rec_len & 3)
137 goto Ealign;
138 if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
139 goto Enamelen;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800140 if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700141 goto Espan;
142 if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
143 UFS_SB(sb)->s_uspi->s_ncg))
144 goto Einumber;
145 }
146 if (offs != limit)
147 goto Eend;
148out:
149 SetPageChecked(page);
150 return;
151
152 /* Too bad, we had an error */
153
154Ebadsize:
155 ufs_error(sb, "ufs_check_page",
156 "size of directory #%lu is not a multiple of chunk size",
157 dir->i_ino
158 );
159 goto fail;
160Eshort:
161 error = "rec_len is smaller than minimal";
162 goto bad_entry;
163Ealign:
164 error = "unaligned directory entry";
165 goto bad_entry;
166Enamelen:
167 error = "rec_len is too small for name_len";
168 goto bad_entry;
169Espan:
170 error = "directory entry across blocks";
171 goto bad_entry;
172Einumber:
173 error = "inode out of bounds";
174bad_entry:
175 ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
176 "offset=%lu, rec_len=%d, name_len=%d",
177 dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
178 rec_len, ufs_get_de_namlen(sb, p));
179 goto fail;
180Eend:
181 p = (struct ufs_dir_entry *)(kaddr + offs);
Harvey Harrison9746077a72008-04-28 02:16:17 -0700182 ufs_error(sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700183 "entry in directory #%lu spans the page boundary"
184 "offset=%lu",
185 dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs);
186fail:
187 SetPageChecked(page);
188 SetPageError(page);
189}
190
191static struct page *ufs_get_page(struct inode *dir, unsigned long n)
192{
193 struct address_space *mapping = dir->i_mapping;
Nick Piggin6fe69002007-05-06 14:49:04 -0700194 struct page *page = read_mapping_page(mapping, n, NULL);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700195 if (!IS_ERR(page)) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700196 kmap(page);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700197 if (!PageChecked(page))
198 ufs_check_page(page);
199 if (PageError(page))
200 goto fail;
201 }
202 return page;
203
204fail:
205 ufs_put_page(page);
206 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
209/*
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700210 * Return the offset into page `page_nr' of the last valid
211 * byte in that page, plus one.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700213static unsigned
214ufs_last_byte(struct inode *inode, unsigned long page_nr)
215{
216 unsigned last_byte = inode->i_size;
217
218 last_byte -= page_nr << PAGE_CACHE_SHIFT;
219 if (last_byte > PAGE_CACHE_SIZE)
220 last_byte = PAGE_CACHE_SIZE;
221 return last_byte;
222}
223
224static inline struct ufs_dir_entry *
225ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p)
226{
227 return (struct ufs_dir_entry *)((char *)p +
228 fs16_to_cpu(sb, p->d_reclen));
229}
230
231struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
232{
233 struct page *page = ufs_get_page(dir, 0);
234 struct ufs_dir_entry *de = NULL;
235
236 if (!IS_ERR(page)) {
237 de = ufs_next_entry(dir->i_sb,
238 (struct ufs_dir_entry *)page_address(page));
239 *p = page;
240 }
241 return de;
242}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244/*
245 * ufs_find_entry()
246 *
247 * finds an entry in the specified directory with the wanted name. It
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700248 * returns the page in which the entry was found, and the entry itself
249 * (as a parameter - res_dir). Page is returned mapped and unlocked.
250 * Entry is guaranteed to be valid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700252struct ufs_dir_entry *ufs_find_entry(struct inode *dir, struct dentry *dentry,
253 struct page **res_page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 struct super_block *sb = dir->i_sb;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700256 const char *name = dentry->d_name.name;
257 int namelen = dentry->d_name.len;
258 unsigned reclen = UFS_DIR_REC_LEN(namelen);
259 unsigned long start, n;
260 unsigned long npages = ufs_dir_pages(dir);
261 struct page *page = NULL;
Evgeniy Dushistovdd187a22006-06-25 05:47:25 -0700262 struct ufs_inode_info *ui = UFS_I(dir);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700263 struct ufs_dir_entry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700265 UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700267 if (npages == 0 || namelen > UFS_MAXNAMLEN)
268 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700270 /* OFFSET_CACHE */
271 *res_page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Evgeniy Dushistovdd187a22006-06-25 05:47:25 -0700273 start = ui->i_dir_start_lookup;
274
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700275 if (start >= npages)
276 start = 0;
277 n = start;
278 do {
279 char *kaddr;
280 page = ufs_get_page(dir, n);
281 if (!IS_ERR(page)) {
282 kaddr = page_address(page);
283 de = (struct ufs_dir_entry *) kaddr;
284 kaddr += ufs_last_byte(dir, n) - reclen;
285 while ((char *) de <= kaddr) {
286 if (de->d_reclen == 0) {
Harvey Harrison9746077a72008-04-28 02:16:17 -0700287 ufs_error(dir->i_sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700288 "zero-length directory entry");
289 ufs_put_page(page);
290 goto out;
291 }
292 if (ufs_match(sb, namelen, name, de))
293 goto found;
294 de = ufs_next_entry(sb, de);
295 }
296 ufs_put_page(page);
297 }
298 if (++n >= npages)
299 n = 0;
300 } while (n != start);
301out:
302 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700304found:
305 *res_page = page;
Evgeniy Dushistovdd187a22006-06-25 05:47:25 -0700306 ui->i_dir_start_lookup = n;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700307 return de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308}
309
310/*
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700311 * Parent is locked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 */
313int ufs_add_link(struct dentry *dentry, struct inode *inode)
314{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 struct inode *dir = dentry->d_parent->d_inode;
316 const char *name = dentry->d_name.name;
317 int namelen = dentry->d_name.len;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700318 struct super_block *sb = dir->i_sb;
319 unsigned reclen = UFS_DIR_REC_LEN(namelen);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800320 const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700321 unsigned short rec_len, name_len;
322 struct page *page = NULL;
323 struct ufs_dir_entry *de;
324 unsigned long npages = ufs_dir_pages(dir);
325 unsigned long n;
326 char *kaddr;
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700327 loff_t pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 int err;
329
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700330 UFSD("ENTER, name %s, namelen %u\n", name, namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700332 /*
333 * We take care of directory expansion in the same loop.
334 * This code plays outside i_size, so it locks the page
335 * to protect that region.
336 */
337 for (n = 0; n <= npages; n++) {
338 char *dir_end;
339
340 page = ufs_get_page(dir, n);
341 err = PTR_ERR(page);
342 if (IS_ERR(page))
343 goto out;
344 lock_page(page);
345 kaddr = page_address(page);
346 dir_end = kaddr + ufs_last_byte(dir, n);
347 de = (struct ufs_dir_entry *)kaddr;
348 kaddr += PAGE_CACHE_SIZE - reclen;
349 while ((char *)de <= kaddr) {
350 if ((char *)de == dir_end) {
351 /* We hit i_size */
352 name_len = 0;
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800353 rec_len = chunk_size;
354 de->d_reclen = cpu_to_fs16(sb, chunk_size);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700355 de->d_ino = 0;
356 goto got_it;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700358 if (de->d_reclen == 0) {
Harvey Harrison9746077a72008-04-28 02:16:17 -0700359 ufs_error(dir->i_sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700360 "zero-length directory entry");
361 err = -EIO;
362 goto out_unlock;
363 }
364 err = -EEXIST;
365 if (ufs_match(sb, namelen, name, de))
366 goto out_unlock;
367 name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de));
368 rec_len = fs16_to_cpu(sb, de->d_reclen);
369 if (!de->d_ino && rec_len >= reclen)
370 goto got_it;
371 if (rec_len >= name_len + reclen)
372 goto got_it;
373 de = (struct ufs_dir_entry *) ((char *) de + rec_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700375 unlock_page(page);
376 ufs_put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700378 BUG();
379 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700381got_it:
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700382 pos = page_offset(page) +
383 (char*)de - (char*)page_address(page);
384 err = __ufs_write_begin(NULL, page->mapping, pos, rec_len,
385 AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700386 if (err)
387 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (de->d_ino) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700389 struct ufs_dir_entry *de1 =
390 (struct ufs_dir_entry *) ((char *) de + name_len);
391 de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len);
392 de->d_reclen = cpu_to_fs16(sb, name_len);
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 de = de1;
395 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 ufs_set_de_namlen(sb, de, namelen);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700398 memcpy(de->d_name, name, namelen + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 de->d_ino = cpu_to_fs32(sb, inode->i_ino);
400 ufs_set_de_type(sb, de, inode->i_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700402 err = ufs_commit_chunk(page, pos, rec_len);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700403 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
404
405 mark_inode_dirty(dir);
406 /* OFFSET_CACHE */
407out_put:
408 ufs_put_page(page);
409out:
410 return err;
411out_unlock:
412 unlock_page(page);
413 goto out_put;
414}
415
416static inline unsigned
417ufs_validate_entry(struct super_block *sb, char *base,
418 unsigned offset, unsigned mask)
419{
420 struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset);
421 struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask));
422 while ((char*)p < (char*)de) {
423 if (p->d_reclen == 0)
424 break;
425 p = ufs_next_entry(sb, p);
426 }
427 return (char *)p - base;
428}
429
430
431/*
432 * This is blatantly stolen from ext2fs
433 */
434static int
435ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
436{
437 loff_t pos = filp->f_pos;
Josef Sipek763454d2006-12-08 02:37:45 -0800438 struct inode *inode = filp->f_path.dentry->d_inode;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700439 struct super_block *sb = inode->i_sb;
440 unsigned int offset = pos & ~PAGE_CACHE_MASK;
441 unsigned long n = pos >> PAGE_CACHE_SHIFT;
442 unsigned long npages = ufs_dir_pages(inode);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800443 unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700444 int need_revalidate = filp->f_version != inode->i_version;
445 unsigned flags = UFS_SB(sb)->s_flags;
446
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700447 UFSD("BEGIN\n");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700448
449 if (pos > inode->i_size - UFS_DIR_REC_LEN(1))
450 return 0;
451
452 for ( ; n < npages; n++, offset = 0) {
453 char *kaddr, *limit;
454 struct ufs_dir_entry *de;
455
456 struct page *page = ufs_get_page(inode, n);
457
458 if (IS_ERR(page)) {
Harvey Harrison9746077a72008-04-28 02:16:17 -0700459 ufs_error(sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700460 "bad page in #%lu",
461 inode->i_ino);
462 filp->f_pos += PAGE_CACHE_SIZE - offset;
463 return -EIO;
464 }
465 kaddr = page_address(page);
466 if (unlikely(need_revalidate)) {
467 if (offset) {
468 offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
469 filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
470 }
471 filp->f_version = inode->i_version;
472 need_revalidate = 0;
473 }
474 de = (struct ufs_dir_entry *)(kaddr+offset);
475 limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1);
476 for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) {
477 if (de->d_reclen == 0) {
Harvey Harrison9746077a72008-04-28 02:16:17 -0700478 ufs_error(sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700479 "zero-length directory entry");
480 ufs_put_page(page);
481 return -EIO;
482 }
483 if (de->d_ino) {
484 int over;
485 unsigned char d_type = DT_UNKNOWN;
486
487 offset = (char *)de - kaddr;
488
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700489 UFSD("filldir(%s,%u)\n", de->d_name,
490 fs32_to_cpu(sb, de->d_ino));
491 UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700492
493 if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
494 d_type = de->d_u.d_44.d_type;
495
496 over = filldir(dirent, de->d_name,
497 ufs_get_de_namlen(sb, de),
498 (n<<PAGE_CACHE_SHIFT) | offset,
499 fs32_to_cpu(sb, de->d_ino), d_type);
500 if (over) {
501 ufs_put_page(page);
502 return 0;
503 }
504 }
505 filp->f_pos += fs16_to_cpu(sb, de->d_reclen);
506 }
507 ufs_put_page(page);
508 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return 0;
510}
511
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513/*
514 * ufs_delete_entry deletes a directory entry by merging it with the
515 * previous entry.
516 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700517int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir,
518 struct page * page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700520 struct super_block *sb = inode->i_sb;
521 struct address_space *mapping = page->mapping;
522 char *kaddr = page_address(page);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800523 unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700524 unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700525 loff_t pos;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700526 struct ufs_dir_entry *pde = NULL;
527 struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
528 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700530 UFSD("ENTER\n");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700531
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700532 UFSD("ino %u, reclen %u, namlen %u, name %s\n",
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700533 fs32_to_cpu(sb, de->d_ino),
534 fs16_to_cpu(sb, de->d_reclen),
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700535 ufs_get_de_namlen(sb, de), de->d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700537 while ((char*)de < (char*)dir) {
538 if (de->d_reclen == 0) {
Harvey Harrison9746077a72008-04-28 02:16:17 -0700539 ufs_error(inode->i_sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700540 "zero-length directory entry");
541 err = -EIO;
542 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700544 pde = de;
545 de = ufs_next_entry(sb, de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700547 if (pde)
548 from = (char*)pde - (char*)page_address(page);
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700549
550 pos = page_offset(page) + from;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700551 lock_page(page);
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700552 err = __ufs_write_begin(NULL, mapping, pos, to - from,
553 AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700554 BUG_ON(err);
555 if (pde)
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700556 pde->d_reclen = cpu_to_fs16(sb, to - from);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700557 dir->d_ino = 0;
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700558 err = ufs_commit_chunk(page, pos, to - from);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700559 inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
560 mark_inode_dirty(inode);
561out:
562 ufs_put_page(page);
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -0700563 UFSD("EXIT\n");
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700564 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
566
567int ufs_make_empty(struct inode * inode, struct inode *dir)
568{
569 struct super_block * sb = dir->i_sb;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700570 struct address_space *mapping = inode->i_mapping;
571 struct page *page = grab_cache_page(mapping, 0);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800572 const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 struct ufs_dir_entry * de;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700574 char *base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 int err;
576
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700577 if (!page)
578 return -ENOMEM;
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700579
580 err = __ufs_write_begin(NULL, mapping, 0, chunk_size,
581 AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700582 if (err) {
583 unlock_page(page);
584 goto fail;
585 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700587 kmap(page);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700588 base = (char*)page_address(page);
589 memset(base, 0, PAGE_CACHE_SIZE);
590
591 de = (struct ufs_dir_entry *) base;
592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 de->d_ino = cpu_to_fs32(sb, inode->i_ino);
594 ufs_set_de_type(sb, de, inode->i_mode);
595 ufs_set_de_namlen(sb, de, 1);
596 de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1));
597 strcpy (de->d_name, ".");
598 de = (struct ufs_dir_entry *)
599 ((char *)de + fs16_to_cpu(sb, de->d_reclen));
600 de->d_ino = cpu_to_fs32(sb, dir->i_ino);
601 ufs_set_de_type(sb, de, dir->i_mode);
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800602 de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 ufs_set_de_namlen(sb, de, 2);
604 strcpy (de->d_name, "..");
Nick Piggin82b9d1d2007-10-16 01:25:19 -0700605 kunmap(page);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700606
Evgeniy Dushistovf3369532007-02-08 14:20:25 -0800607 err = ufs_commit_chunk(page, 0, chunk_size);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700608fail:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700609 page_cache_release(page);
610 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}
612
613/*
614 * routine to check that the specified directory is empty (for rmdir)
615 */
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700616int ufs_empty_dir(struct inode * inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700618 struct super_block *sb = inode->i_sb;
619 struct page *page = NULL;
620 unsigned long i, npages = ufs_dir_pages(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700622 for (i = 0; i < npages; i++) {
623 char *kaddr;
624 struct ufs_dir_entry *de;
625 page = ufs_get_page(inode, i);
626
627 if (IS_ERR(page))
628 continue;
629
630 kaddr = page_address(page);
631 de = (struct ufs_dir_entry *)kaddr;
632 kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1);
633
634 while ((char *)de <= kaddr) {
635 if (de->d_reclen == 0) {
Harvey Harrison9746077a72008-04-28 02:16:17 -0700636 ufs_error(inode->i_sb, __func__,
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700637 "zero-length directory entry: "
638 "kaddr=%p, de=%p\n", kaddr, de);
639 goto not_empty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700641 if (de->d_ino) {
642 u16 namelen=ufs_get_de_namlen(sb, de);
643 /* check for . and .. */
644 if (de->d_name[0] != '.')
645 goto not_empty;
646 if (namelen > 2)
647 goto not_empty;
648 if (namelen < 2) {
649 if (inode->i_ino !=
650 fs32_to_cpu(sb, de->d_ino))
651 goto not_empty;
652 } else if (de->d_name[1] != '.')
653 goto not_empty;
654 }
655 de = ufs_next_entry(sb, de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 }
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700657 ufs_put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 return 1;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700660
661not_empty:
662 ufs_put_page(page);
663 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664}
665
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800666const struct file_operations ufs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 .read = generic_read_dir,
668 .readdir = ufs_readdir,
Al Viroa9328012009-06-07 15:35:18 -0400669 .fsync = simple_fsync,
Christoph Hellwig3222a3e2008-09-03 21:53:01 +0200670 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671};