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btrfs: use num_device to check for the last surviving seed device 

For both sprout and seed fsids,
 btrfs_fs_devices::num_devices provides device count including missing
 btrfs_fs_devices::open_devices provides device count excluding missing

We create a dummy struct btrfs_device for the missing device, so
num_devices != open_devices when there is a missing device.

In btrfs_rm_devices() we wrongly check for %cur_devices->open_devices
before freeing the seed fs_devices. Instead we should check for
%cur_devices->num_devices.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2021-10-05 16:12:39 -04:00 committed by David Sterba
parent 10adb1152d
commit 8e906945c0
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/volumes.c
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@ -2211,7 +2211,7 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
synchronize_rcu();
btrfs_free_device(device);
if (cur_devices->open_devices == 0) {
if (cur_devices->num_devices == 0) {
list_del_init(&cur_devices->seed_list);
close_fs_devices(cur_devices);
free_fs_devices(cur_devices);