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btrfs: fix in-memory value of total_devices after seed device deletion

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[ Upstream commit b4993e64f78a9605b45252fa9ba385c88a1f4ce9 ]

In case of deleting the seed device the %cur_devices (seed) and the
%fs_devices (parent) are different. Now, as the parent
fs_devices::total_devices also maintains the total number of devices
including the seed device, so decrement its in-memory value for the
successful seed delete. We are already updating its corresponding
on-disk btrfs_super_block::number_devices value.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anand Jain 2018-07-03 17:07:23 +08:00 committed by Greg Kroah-Hartman
parent 32455d96e3
commit 4c8415cf5b
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/volumes.c
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@ -2029,6 +2029,9 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
cur_devices->num_devices--;
cur_devices->total_devices--;
/* Update total_devices of the parent fs_devices if it's seed */
if (cur_devices != fs_devices)
fs_devices->total_devices--;
if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
cur_devices->missing_devices--;