simple_write_end(): don't zero in short copy into uptodate (04fff641) · Commits · e / devices / android_kernel_oneplus_sm7250

fs/libfs.c

+8 −6

Original line number	Diff line number	Diff line
		@@ -465,6 +465,8 @@ EXPORT_SYMBOL(simple_write_begin);
		* is not called, so a filesystem that actually does store data in .write_inode
		* should extend on what's done here with a call to mark_inode_dirty() in the
		* case that i_size has changed.
		*
		* Use ONLY with simple_readpage()
		*/
		int simple_write_end(struct file file, struct address_space mapping,
		loff_t pos, unsigned len, unsigned copied,
		@@ -474,14 +476,14 @@ int simple_write_end(struct file file, struct address_space mapping,
		loff_t last_pos = pos + copied;

		/* zero the stale part of the page if we did a short copy */
		if (!PageUptodate(page)) {
		if (copied < len) {
		unsigned from = pos & (PAGE_SIZE - 1);

		zero_user(page, from + copied, len - copied);
		}

		if (!PageUptodate(page))
		SetPageUptodate(page);
		}
		/*
		* No need to use i_size_read() here, the i_size
		* cannot change under us because we hold the i_mutex.