f2fs: add a case of no need to read a page in write begin (746e2403) · Commits · 戴 / test

If the range we write cover the whole valid data in the last page, we do not need to read it. Signed-off-by:

Yunlei He <heyunlei@huawei.com> [Jaegeuk Kim: nullify the remaining area (fix: xfstests/f2fs/001)] Signed-off-by:

fs/f2fs/data.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -1715,6 +1715,11 @@ repeat:
		if (len == PAGE_SIZE \|\| PageUptodate(page))
		return 0;

		if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) {
		zero_user_segment(page, len, PAGE_SIZE);
		return 0;
		}

		if (blkaddr == NEW_ADDR) {
		zero_user_segment(page, 0, PAGE_SIZE);
		SetPageUptodate(page);
		@@ -1768,7 +1773,7 @@ static int f2fs_write_end(struct file *file,
		* let generic_perform_write() try to copy data again through copied=0.
		*/
		if (!PageUptodate(page)) {
		if (unlikely(copied != PAGE_SIZE))
		if (unlikely(copied != len))
		copied = 0;
		else
		SetPageUptodate(page);