From: Chris Mason <chris.mason@oracle.com>
Date: Mon, 21 Apr 2008 12:28:10 +0000 (-0400)
Subject: Btrfs: Add 1MB to the min_free in alloc_chunk
X-Git-Tag: firefly_0821_release~15789^2~11^2~55^2~56^2~30^2~214
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ad5bd91ecee2b687071da00094564fd075f934ee;p=firefly-linux-kernel-4.4.55.git

Btrfs: Add 1MB to the min_free in alloc_chunk

This properly reflects the first 1MB we skip at the start of the device

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

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index fe5b00986d22..4fc92cf813d8 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -746,6 +746,9 @@ again:
 	else
 		min_free = calc_size;
 
+	/* we add 1MB because we never use the first 1MB of the device */
+	min_free += 1024 * 1024;
+
 	/* build a private list of devices we will allocate from */
 	while(index < num_stripes) {
 		device = list_entry(cur, struct btrfs_device, dev_list);