Matthew,
----- Ursprüngliche Mail -----
> Von: "Matthew Wilcox" <willy@xxxxxxxxxxxxx>
> -static int do_writepage(struct page *page, int len)
> +static int do_writepage(struct folio *folio, size_t len)
> {
> int err = 0, i, blen;
> unsigned int block;
> void *addr;
> + size_t offset = 0;
> union ubifs_key key;
> - struct inode *inode = page->mapping->host;
> + struct inode *inode = folio->mapping->host;
> struct ubifs_info *c = inode->i_sb->s_fs_info;
>
> #ifdef UBIFS_DEBUG
> struct ubifs_inode *ui = ubifs_inode(inode);
> spin_lock(&ui->ui_lock);
> - ubifs_assert(c, page->index <= ui->synced_i_size >> PAGE_SHIFT);
> + ubifs_assert(c, folio->index <= ui->synced_i_size >> PAGE_SHIFT);
> spin_unlock(&ui->ui_lock);
> #endif
>
> - /* Update radix tree tags */
> - set_page_writeback(page);
> + folio_start_writeback(folio);
>
> - addr = kmap(page);
> - block = page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
> + addr = kmap_local_folio(folio, offset);
> + block = folio->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
> i = 0;
> - while (len) {
> - blen = min_t(int, len, UBIFS_BLOCK_SIZE);
> + for (;;) {
This change will cause a file system corruption.
If len is zero (it can be) then a zero length data node will be written.
The while(len) made sure that upon zero length nothing is written.
Thanks,
//richard
