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SubjectRe: [PATCH v7] fs: Add VirtualBox guest shared folder (vboxsf) support
Hi Hans,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16 next-20180329]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Hans-de-Goede/fs-Add-VirtualBox-guest-shared-folder-vboxsf-support/20180331-001843
config: x86_64-randconfig-g0-04030108 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All error/warnings (new ones prefixed by >>):

fs//vboxsf/file.c: In function 'sf_readpage':
>> fs//vboxsf/file.c:236:2: error: implicit declaration of function 'page_offset' [-Werror=implicit-function-declaration]
loff_t off = page_offset(page);
^
>> fs//vboxsf/file.c:241:2: error: implicit declaration of function 'kmap' [-Werror=implicit-function-declaration]
buf = kmap(page);
^
>> fs//vboxsf/file.c:241:6: warning: assignment makes pointer from integer without a cast
buf = kmap(page);
^
>> fs//vboxsf/file.c:246:3: error: implicit declaration of function 'flush_dcache_page' [-Werror=implicit-function-declaration]
flush_dcache_page(page);
^
>> fs//vboxsf/file.c:247:3: error: implicit declaration of function 'SetPageUptodate' [-Werror=implicit-function-declaration]
SetPageUptodate(page);
^
>> fs//vboxsf/file.c:249:3: error: implicit declaration of function 'SetPageError' [-Werror=implicit-function-declaration]
SetPageError(page);
^
>> fs//vboxsf/file.c:252:2: error: implicit declaration of function 'kunmap' [-Werror=implicit-function-declaration]
kunmap(page);
^
>> fs//vboxsf/file.c:253:2: error: implicit declaration of function 'unlock_page' [-Werror=implicit-function-declaration]
unlock_page(page);
^
fs//vboxsf/file.c: In function 'sf_writepage':
fs//vboxsf/file.c:272:6: warning: assignment makes pointer from integer without a cast
buf = kmap(page);
^
>> fs//vboxsf/file.c:277:3: error: implicit declaration of function 'ClearPageError' [-Werror=implicit-function-declaration]
ClearPageError(page);
^
>> fs//vboxsf/file.c:281:3: error: implicit declaration of function 'ClearPageUptodate' [-Werror=implicit-function-declaration]
ClearPageUptodate(page);
^
fs//vboxsf/file.c: In function 'sf_write_end':
fs//vboxsf/file.c:300:6: warning: assignment makes pointer from integer without a cast
buf = kmap(page);
^
>> fs//vboxsf/file.c:311:2: error: implicit declaration of function 'PageUptodate' [-Werror=implicit-function-declaration]
if (!PageUptodate(page) && nwritten == PAGE_SIZE)
^
>> fs//vboxsf/file.c:320:2: error: implicit declaration of function 'put_page' [-Werror=implicit-function-declaration]
put_page(page);
^
fs//vboxsf/file.c: At top level:
>> fs//vboxsf/file.c:328:20: error: '__set_page_dirty_nobuffers' undeclared here (not in a function)
.set_page_dirty = __set_page_dirty_nobuffers,
^
cc1: some warnings being treated as errors

vim +/page_offset +236 fs//vboxsf/file.c

231
232 static int sf_readpage(struct file *file, struct page *page)
233 {
234 struct sf_glob_info *sf_g = GET_GLOB_INFO(file_inode(file)->i_sb);
235 struct sf_reg_info *sf_r = file->private_data;
> 236 loff_t off = page_offset(page);
237 u32 nread = PAGE_SIZE;
238 u8 *buf;
239 int err;
240
> 241 buf = kmap(page);
242
243 err = vboxsf_read(sf_g->root, sf_r->handle, off, &nread, buf, false);
244 if (err == 0) {
245 memset(&buf[nread], 0, PAGE_SIZE - nread);
> 246 flush_dcache_page(page);
> 247 SetPageUptodate(page);
248 } else {
> 249 SetPageError(page);
250 }
251
> 252 kunmap(page);
> 253 unlock_page(page);
254 return err;
255 }
256
257 static int sf_writepage(struct page *page, struct writeback_control *wbc)
258 {
259 struct inode *inode = page->mapping->host;
260 struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
261 struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
262 struct sf_reg_info *sf_r = sf_i->file->private_data;
263 loff_t off = page_offset(page);
264 loff_t size = i_size_read(inode);
265 u32 nwrite = PAGE_SIZE;
266 u8 *buf;
267 int err;
268
269 if (off + PAGE_SIZE > size)
270 nwrite = size & ~PAGE_MASK;
271
> 272 buf = kmap(page);
273 err = vboxsf_write(sf_g->root, sf_r->handle, off, &nwrite, buf, false);
274 kunmap(page);
275
276 if (err == 0) {
> 277 ClearPageError(page);
278 /* mtime changed */
279 sf_i->force_restat = 1;
280 } else {
> 281 ClearPageUptodate(page);
282 }
283
284 unlock_page(page);
285 return err;
286 }
287
288 int sf_write_end(struct file *file, struct address_space *mapping, loff_t pos,
289 unsigned int len, unsigned int copied, struct page *page,
290 void *fsdata)
291 {
292 struct inode *inode = mapping->host;
293 struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
294 struct sf_reg_info *sf_r = file->private_data;
295 unsigned int from = pos & ~PAGE_MASK;
296 u32 nwritten = len;
297 u8 *buf;
298 int err;
299
> 300 buf = kmap(page);
301 err = vboxsf_write(sf_g->root, sf_r->handle, pos, &nwritten,
302 buf + from, false);
303 kunmap(page);
304
305 if (err)
306 goto out;
307
308 /* mtime changed */
309 GET_INODE_INFO(inode)->force_restat = 1;
310
> 311 if (!PageUptodate(page) && nwritten == PAGE_SIZE)
312 SetPageUptodate(page);
313
314 pos += nwritten;
315 if (pos > inode->i_size)
316 i_size_write(inode, pos);
317
318 out:
319 unlock_page(page);
> 320 put_page(page);
321
322 return err;
323 }
324
325 const struct address_space_operations vboxsf_reg_aops = {
326 .readpage = sf_readpage,
327 .writepage = sf_writepage,
> 328 .set_page_dirty = __set_page_dirty_nobuffers,
329 .write_begin = simple_write_begin,
330 .write_end = sf_write_end,
331 };
332

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