Commit 0baaea64 authored May 12, 2014 by Lukas Czerner Committed by Theodore Ts'o May 12, 2014

ext4: use EXT_MAX_BLOCKS in ext4_es_can_be_merged()



In ext4_es_can_be_merged() when checking whether we can merge two
extents we should use EXT_MAX_BLOCKS instead of defining it manually.
Also if it is really the case we should notify userspace because clearly
there is a bug in extent status tree implementation since this should
never happen.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>

parent 5d601255

fs/ext4/extents_status.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -344,8 +344,14 @@ static int ext4_es_can_be_merged(struct extent_status *es1,
		if (ext4_es_status(es1) != ext4_es_status(es2))
		return 0;

		if (((__u64) es1->es_len) + es2->es_len > 0xFFFFFFFFULL)
		if (((__u64) es1->es_len) + es2->es_len > EXT_MAX_BLOCKS) {
		pr_warn("ES assertion failed when merging extents. "
		"The sum of lengths of es1 (%d) and es2 (%d) "
		"is bigger than allowed file size (%d)\n",
		es1->es_len, es2->es_len, EXT_MAX_BLOCKS);
		WARN_ON(1);
		return 0;
		}

		if (((__u64) es1->es_lblk) + es1->es_len != es2->es_lblk)
		return 0;