iomap: iomap_write_failed fix

stable inclusion
from stable-v5.10.121
commit f40549ce20e81c8e1df28db41ba1a76a4b8ab034
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f40549ce20e81c8e1df28db41ba1a76a4b8ab034

--------------------------------

[ Upstream commit b71450e2 ]

The @lend parameter of truncate_pagecache_range() should be the offset
of the last byte of the hole, not the first byte beyond it.

Fixes: ae259a9c ("fs: introduce iomap infrastructure")
Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: NDarrick J. Wong <djwong@kernel.org>
Signed-off-by: NDarrick J. Wong <djwong@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

fs/iomap/buffered-io.c

@@ -528,7 +528,8 @@ iomap_write_failed(struct inode *inode, loff_t pos, unsigned len)
 	 * write started inside the existing inode size.
 	 */
 	if (pos + len > i_size)
-		truncate_pagecache_range(inode, max(pos, i_size), pos + len);
+		truncate_pagecache_range(inode, max(pos, i_size),
+					 pos + len - 1);
 }
 
 static int