fs/sysv/dir.c

31 static void dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
33 	struct address_space *mapping = page->mapping;
36 	block_write_end(NULL, mapping, pos, len, len, page, NULL);
41 	unlock_page(page);
61 static void *dir_get_page(struct inode *dir, unsigned long n, struct page **p)
64 	struct page *page = read_mapping_page(mapping, n, NULL);
65 	if (IS_ERR(page))
66 		return ERR_CAST(page);
67 	*p = page;
68 	return kmap_local_page(page);
90 		struct page *page;
92 		kaddr = dir_get_page(inode, n, &page);
106 				unmap_and_put_page(page, kaddr);
110 		unmap_and_put_page(page, kaddr);
139 struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
146 	struct page *page = NULL;
157 		char *kaddr = dir_get_page(dir, n, &page);
169 			unmap_and_put_page(page, kaddr);
180 	*res_page = page;
189 	struct page *page = NULL;
199 		kaddr = dir_get_page(dir, n, &page);
212 		unmap_and_put_page(page, kaddr);
218 	pos = page_offset(page) + offset_in_page(de);
219 	lock_page(page);
220 	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
226 	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
231 	unmap_and_put_page(page, kaddr);
234 	unlock_page(page);
238 int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
240 	struct inode *inode = page->mapping->host;
241 	loff_t pos = page_offset(page) + offset_in_page(de);
244 	lock_page(page);
245 	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
247 		unlock_page(page);
251 	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
259 	struct page *page = grab_cache_page(inode->i_mapping, 0);
264 	if (!page)
266 	err = sysv_prepare_chunk(page, 0, 2 * SYSV_DIRSIZE);
268 		unlock_page(page);
271 	base = kmap_local_page(page);
282 	dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
285 	put_page(page);
295 	struct page *page = NULL;
302 		kaddr = dir_get_page(inode, i, &page);
324 		unmap_and_put_page(page, kaddr);
329 	unmap_and_put_page(page, kaddr);
333 /* Releases the page */
334 int sysv_set_link(struct sysv_dir_entry *de, struct page *page,
337 	struct inode *dir = page->mapping->host;
338 	loff_t pos = page_offset(page) + offset_in_page(de);
341 	lock_page(page);
342 	err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE);
344 		unlock_page(page);
348 	dir_commit_chunk(page, pos, SYSV_DIRSIZE);
361 struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct page **p)
373 	struct page *page;
374 	struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);
379 		unmap_and_put_page(page, de);