Btrfs-progs: Don't free the devices when close the ctree

Some commands(such as btrfs-convert) access the devices again after we close
the ctree, so it is better that we don't free the devices objects when the ctree
is closed, or we need re-allocate the memory for the devices. We needn't worry
the memory leak problem, because all the memory will be freed after the taskes
die.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/volumes.c b/volumes.c
index b88385bb..0f6a35ba 100644
--- a/volumes.c
+++ b/volumes.c
@@ -163,6 +163,9 @@ again:
 	list_for_each(cur, &fs_devices->devices) {
 		device = list_entry(cur, struct btrfs_device, dev_list);
 		if (device->fd != -1) {
+			fsync(device->fd);
+			if (posix_fadvise(device->fd, 0, 0, POSIX_FADV_DONTNEED))
+				fprintf(stderr, "Warning, could not drop caches\n");
 			close(device->fd);
 			device->fd = -1;
 		}