From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 5 Feb 2008 15:20:17 +0000 (-0500)
Subject: Btrfs: Add checks for last byte in disk to allocator grouping
X-Git-Tag: firefly_0821_release~15789^2~11^2~55^2~56^2~30^2~293
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=068fe39fa18e8921062e2e16e6aa2b46768b2a35;p=firefly-linux-kernel-4.4.55.git

Btrfs: Add checks for last byte in disk to allocator grouping

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a340eeedd6c7..9e0869959cde 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1611,8 +1611,13 @@ check_pending:
 	}
 	ins->offset = num_bytes;
 	btrfs_free_path(path);
-	if (last_ptr)
+	if (last_ptr) {
 		*last_ptr = ins->objectid + ins->offset;
+		if (*last_ptr ==
+		    btrfs_super_total_bytes(&root->fs_info->super_copy)) {
+			*last_ptr = 0;
+		}
+	}
 	return 0;
 
 new_group: