32  * v9fs_fid_readpage - read an entire page in from 9P
34  * @page: structure to page
37 static int v9fs_fid_readpage(void *data, struct page *page)  in v9fs_fid_readpage()  argument
40 	struct inode *inode = page->mapping->host;  in v9fs_fid_readpage()
41 	struct bio_vec bvec = {.bv_page = page, .bv_len = PAGE_SIZE};  in v9fs_fid_readpage()
47 	BUG_ON(!PageLocked(page));  in v9fs_fid_readpage()
49 	retval = v9fs_readpage_from_fscache(inode, page);  in v9fs_fid_readpage()
55 	retval = p9_client_read(fid, page_offset(page), &to, &err);  in v9fs_fid_readpage()
57 		v9fs_uncache_page(inode, page);  in v9fs_fid_readpage()
62 	zero_user(page, retval, PAGE_SIZE - retval);  in v9fs_fid_readpage()
63 	flush_dcache_page(page);  in v9fs_fid_readpage()
64 	SetPageUptodate(page);  in v9fs_fid_readpage()
66 	v9fs_readpage_to_fscache(inode, page);  in v9fs_fid_readpage()
70 	unlock_page(page);  in v9fs_fid_readpage()
75  * v9fs_vfs_readpage - read an entire page in from 9P
78  * @page: structure to page
82 static int v9fs_vfs_readpage(struct file *filp, struct page *page)  in v9fs_vfs_readpage()  argument
84 	return v9fs_fid_readpage(filp->private_data, page);  in v9fs_vfs_readpage()
117  * v9fs_release_page - release the private state associated with a page
118  * @page: The page to be released
121  * Returns 1 if the page can be released, false otherwise.
124 static int v9fs_release_page(struct page *page, gfp_t gfp)  in v9fs_release_page()  argument
126 	if (PagePrivate(page))  in v9fs_release_page()
128 	return v9fs_fscache_release_page(page, gfp);  in v9fs_release_page()
132  * v9fs_invalidate_page - Invalidate a page completely or partially
133  * @page: The page to be invalidated
138 static void v9fs_invalidate_page(struct page *page, unsigned int offset,  in v9fs_invalidate_page()  argument
143 	 * the private state assocated with the page  in v9fs_invalidate_page()
146 		v9fs_fscache_invalidate_page(page);  in v9fs_invalidate_page()
149 static int v9fs_vfs_writepage_locked(struct page *page)  in v9fs_vfs_writepage_locked()  argument
151 	struct inode *inode = page->mapping->host;  in v9fs_vfs_writepage_locked()
158 	if (page->index == size >> PAGE_SHIFT)  in v9fs_vfs_writepage_locked()
163 	bvec.bv_page = page;  in v9fs_vfs_writepage_locked()
171 	set_page_writeback(page);  in v9fs_vfs_writepage_locked()
173 	p9_client_write(v9inode->writeback_fid, page_offset(page), &from, &err);  in v9fs_vfs_writepage_locked()
175 	end_page_writeback(page);  in v9fs_vfs_writepage_locked()
179 static int v9fs_vfs_writepage(struct page *page, struct writeback_control *wbc)  in v9fs_vfs_writepage()  argument
183 	p9_debug(P9_DEBUG_VFS, "page %p\n", page);  in v9fs_vfs_writepage()
185 	retval = v9fs_vfs_writepage_locked(page);  in v9fs_vfs_writepage()
188 			redirty_page_for_writepage(wbc, page);  in v9fs_vfs_writepage()
191 			SetPageError(page);  in v9fs_vfs_writepage()
192 			mapping_set_error(page->mapping, retval);  in v9fs_vfs_writepage()
197 	unlock_page(page);  in v9fs_vfs_writepage()
202  * v9fs_launder_page - Writeback a dirty page
203  * @page: The page to be cleaned up
208 static int v9fs_launder_page(struct page *page)  in v9fs_launder_page()  argument
211 	struct inode *inode = page->mapping->host;  in v9fs_launder_page()
213 	v9fs_fscache_wait_on_page_write(inode, page);  in v9fs_launder_page()
214 	if (clear_page_dirty_for_io(page)) {  in v9fs_launder_page()
215 		retval = v9fs_vfs_writepage_locked(page);  in v9fs_launder_page()
261 			    struct page **pagep, void **fsdata)  in v9fs_write_begin()
264 	struct page *page;  in v9fs_write_begin()  local
274 	page = grab_cache_page_write_begin(mapping, index, flags);  in v9fs_write_begin()
275 	if (!page) {  in v9fs_write_begin()
280 	if (PageUptodate(page))  in v9fs_write_begin()
286 	retval = v9fs_fid_readpage(v9inode->writeback_fid, page);  in v9fs_write_begin()
287 	put_page(page);  in v9fs_write_begin()
291 	*pagep = page;  in v9fs_write_begin()
297 			  struct page *page, void *fsdata)  in v9fs_write_end()  argument
300 	struct inode *inode = page->mapping->host;  in v9fs_write_end()
304 	if (!PageUptodate(page)) {  in v9fs_write_end()
309 			SetPageUptodate(page);  in v9fs_write_end()
320 	set_page_dirty(page);  in v9fs_write_end()
322 	unlock_page(page);  in v9fs_write_end()
323 	put_page(page);  in v9fs_write_end()