fs/ufs/dir.c

16  * Migration to usage of "page cache" on May 2006 by
45 static void ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
47 	struct address_space *mapping = page->mapping;
51 	block_write_end(NULL, mapping, pos, len, len, page, NULL);
56 	unlock_page(page);
69 static inline void ufs_put_page(struct page *page)
71 	kunmap(page);
72 	put_page(page);
79 	struct page *page;
81 	de = ufs_find_entry(dir, qstr, &page);
84 		ufs_put_page(page);
90 /* Releases the page */
92 		  struct page *page, struct inode *inode,
95 	loff_t pos = page_offset(page) +
96 			(char *) de - (char *) page_address(page);
100 	lock_page(page);
101 	err = ufs_prepare_chunk(page, pos, len);
107 	ufs_commit_chunk(page, pos, len);
108 	ufs_put_page(page);
116 static bool ufs_check_page(struct page *page)
118 	struct inode *dir = page->mapping->host;
120 	char *kaddr = page_address(page);
127 	if ((dir->i_size >> PAGE_SHIFT) == page->index) {
153 	SetPageChecked(page);
181 		   dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
187 		   "entry in directory #%lu spans the page boundary"
189 		   dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
191 	SetPageError(page);
195 static struct page *ufs_get_page(struct inode *dir, unsigned long n)
198 	struct page *page = read_mapping_page(mapping, n, NULL);
199 	if (!IS_ERR(page)) {
200 		kmap(page);
201 		if (unlikely(!PageChecked(page))) {
202 			if (!ufs_check_page(page))
206 	return page;
209 	ufs_put_page(page);
214  * Return the offset into page `page_nr' of the last valid
215  * byte in that page, plus one.
235 struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p)
237 	struct page *page = ufs_get_page(dir, 0);
240 	if (!IS_ERR(page)) {
242 				    (struct ufs_dir_entry *)page_address(page));
243 		*p = page;
252  * returns the page in which the entry was found, and the entry itself
257 				     struct page **res_page)
265 	struct page *page = NULL;
284 		page = ufs_get_page(dir, n);
285 		if (!IS_ERR(page)) {
286 			kaddr = page_address(page);
294 			ufs_put_page(page);
303 	*res_page = page;
320 	struct page *page = NULL;
332 	 * This code plays outside i_size, so it locks the page
338 		page = ufs_get_page(dir, n);
339 		err = PTR_ERR(page);
340 		if (IS_ERR(page))
342 		lock_page(page);
343 		kaddr = page_address(page);
373 		unlock_page(page);
374 		ufs_put_page(page);
380 	pos = page_offset(page) +
381 			(char*)de - (char*)page_address(page);
382 	err = ufs_prepare_chunk(page, pos, rec_len);
399 	ufs_commit_chunk(page, pos, rec_len);
406 	ufs_put_page(page);
410 	unlock_page(page);
451 		struct page *page = ufs_get_page(inode, n);
453 		if (IS_ERR(page)) {
455 				  "bad page in #%lu",
460 		kaddr = page_address(page);
486 					ufs_put_page(page);
492 		ufs_put_page(page);
503 		     struct page * page)
506 	char *kaddr = page_address(page);
532 		from = (char*)pde - (char*)page_address(page);
534 	pos = page_offset(page) + from;
535 	lock_page(page);
536 	err = ufs_prepare_chunk(page, pos, to - from);
541 	ufs_commit_chunk(page, pos, to - from);
546 	ufs_put_page(page);
555 	struct page *page = grab_cache_page(mapping, 0);
561 	if (!page)
564 	err = ufs_prepare_chunk(page, 0, chunk_size);
566 		unlock_page(page);
570 	kmap(page);
571 	base = (char*)page_address(page);
588 	kunmap(page);
590 	ufs_commit_chunk(page, 0, chunk_size);
593 	put_page(page);
603 	struct page *page = NULL;
609 		page = ufs_get_page(inode, i);
611 		if (IS_ERR(page))
614 		kaddr = page_address(page);
641 		ufs_put_page(page);
646 	ufs_put_page(page);