1 // SPDX-License-Identifier: GPL-2.0-only
32  * v9fs_fid_readpage - read an entire page in from 9P
33  * @data: Opaque pointer to the fid being read
37 static int v9fs_fid_readpage(void *data, struct page *page)  in v9fs_fid_readpage()  argument
39 	struct p9_fid *fid = data;  in v9fs_fid_readpage()
40 	struct inode *inode = page->mapping->host;  in v9fs_fid_readpage()
62 	zero_user(page, retval, PAGE_SIZE - retval);  in v9fs_fid_readpage()
75  * v9fs_vfs_readpage - read an entire page in from 9P
84 	return v9fs_fid_readpage(filp->private_data, page);  in v9fs_vfs_readpage()
88  * v9fs_vfs_readpages - read a set of pages from 9P
91  * @mapping: the address space
97 static int v9fs_vfs_readpages(struct file *filp, struct address_space *mapping,  in v9fs_vfs_readpages()  argument
103 	inode = mapping->host;  in v9fs_vfs_readpages()
106 	ret = v9fs_readpages_from_fscache(inode, mapping, pages, &nr_pages);  in v9fs_vfs_readpages()
110 	ret = read_cache_pages(mapping, pages, v9fs_fid_readpage,  in v9fs_vfs_readpages()
111 			filp->private_data);  in v9fs_vfs_readpages()
117  * v9fs_release_page - release the private state associated with a page
132  * v9fs_invalidate_page - Invalidate a page completely or partially
151 	struct inode *inode = page->mapping->host;  in v9fs_vfs_writepage_locked()
158 	if (page->index == size >> PAGE_SHIFT)  in v9fs_vfs_writepage_locked()
169 	BUG_ON(!v9inode->writeback_fid);  in v9fs_vfs_writepage_locked()
173 	p9_client_write(v9inode->writeback_fid, page_offset(page), &from, &err);  in v9fs_vfs_writepage_locked()
187 		if (retval == -EAGAIN) {  in v9fs_vfs_writepage()
192 			mapping_set_error(page->mapping, retval);  in v9fs_vfs_writepage()
202  * v9fs_launder_page - Writeback a dirty page
211 	struct inode *inode = page->mapping->host;  in v9fs_launder_page()
223  * v9fs_direct_IO - 9P address space operation for direct I/O
225  * @iter: The data/buffer to use
230  * In the non-cached mode, we shunt off direct read and write requests before
241 	struct file *file = iocb->ki_filp;  in v9fs_direct_IO()
242 	loff_t pos = iocb->ki_pos;  in v9fs_direct_IO()
246 		n = p9_client_write(file->private_data, pos, iter, &err);  in v9fs_direct_IO()
251 				inode_add_bytes(inode, pos + n - i_size);  in v9fs_direct_IO()
254 		n = p9_client_read(file->private_data, pos, iter, &err);  in v9fs_direct_IO()
259 static int v9fs_write_begin(struct file *filp, struct address_space *mapping,  in v9fs_write_begin()  argument
267 	struct inode *inode = mapping->host;  in v9fs_write_begin()
270 	p9_debug(P9_DEBUG_VFS, "filp %p, mapping %p\n", filp, mapping);  in v9fs_write_begin()
274 	page = grab_cache_page_write_begin(mapping, index, flags);  in v9fs_write_begin()
276 		retval = -ENOMEM;  in v9fs_write_begin()
279 	BUG_ON(!v9inode->writeback_fid);  in v9fs_write_begin()
286 	retval = v9fs_fid_readpage(v9inode->writeback_fid, page);  in v9fs_write_begin()
295 static int v9fs_write_end(struct file *filp, struct address_space *mapping,  in v9fs_write_end()  argument
300 	struct inode *inode = page->mapping->host;  in v9fs_write_end()
302 	p9_debug(P9_DEBUG_VFS, "filp %p, mapping %p\n", filp, mapping);  in v9fs_write_end()
316 	if (last_pos > inode->i_size) {  in v9fs_write_end()
317 		inode_add_bytes(inode, last_pos - inode->i_size);  in v9fs_write_end()