[PATCH 1/2] btrfs-progs: block group: do not exclude bytenr adjacent to block group

[damenly.su@gmail.com]

From: Su Yue <Damenly_Su@gmx.com>

While checking the image provided by the reporter, the btrfsck aborts:
======================================================================
Opening filesystem to check...
extent_io.c:158: insert_state: BUG_ON `end < start` triggered, value 1
btrfs check(+0xa3fa8)[0x5614c14c7fa8]
btrfs check(+0xa4046)[0x5614c14c8046]
btrfs check(+0xa45f1)[0x5614c14c85f1]
btrfs check(set_extent_bits+0x83)[0x5614c14c8c63]
btrfs check(+0xbfb90)[0x5614c14e3b90]
btrfs check(exclude_super_stripes+0x1fc)[0x5614c14e3de9]
btrfs check(+0xbd85d)[0x5614c14e185d]
btrfs check(btrfs_read_block_groups+0xd3)[0x5614c14e19f5]
btrfs check(btrfs_setup_all_roots+0x454)[0x5614c14d7740]
btrfs check(+0xb4219)[0x5614c14d8219]
btrfs check(open_ctree_fs_info+0x177)[0x5614c14d8415]
btrfs check(+0x693dd)[0x5614c148d3dd]
btrfs check(+0x14dc7)[0x5614c1438dc7]
btrfs check(main+0x126)[0x5614c1439713]
/usr/lib/libc.so.6(__libc_start_main+0xf3)[0x7fe3f1ecf153]
btrfs check(_start+0x2e)[0x5614c1438cce]
[1]    6196 abort (core dumped)
======================================================================

It's excluding super stripes from one block group, the bytenr equals
block group's start + len, so the @num_bytes is 0. Then
add_exclude_extent() calculates the @end is less than the @start
which trigers the abort.

Anyway, the logical bytenr should not be excluded if the block group's
start + len equals it, because it's not belong to the block group.

Link: https://github.com/kdave/btrfs-progs/issues/210
Signed-off-by: Su Yue <Damenly_Su@gmx.com>
---
 extent-tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/extent-tree.c b/extent-tree.c
index f690ae999f37..848fb72f90a4 100644
--- a/extent-tree.c
+++ b/extent-tree.c
@@ -3630,7 +3630,7 @@ int exclude_super_stripes(struct btrfs_fs_info *fs_info,
 		while (nr--) {
 			u64 start, len;
 
-			if (logical[nr] > cache->key.objectid +
+			if (logical[nr] >= cache->key.objectid +
 			    cache->key.offset)
 				continue;
 
-- 
2.23.0