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btrfs: use device_list_mutex when removing stale devices

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btrfs_free_stale_devices() finds a stale (not opened) device matching
path in the fs_uuid list. We are already under uuid_mutex so when we
check for each fs_devices, hold the device_list_mutex too.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2018-05-29 17:23:20 +08:00 committed by David Sterba
parent fa6d2ae540
commit 7bcb8164ad
1 changed files with 15 additions and 10 deletions
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25
fs/btrfs/volumes.c
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@ -637,8 +637,11 @@ static void btrfs_free_stale_devices(const char *path,
struct btrfs_device *device, *tmp_device;
list_for_each_entry_safe(fs_devices, tmp_fs_devices, &fs_uuids, fs_list) {
if (fs_devices->opened)
mutex_lock(&fs_devices->device_list_mutex);
if (fs_devices->opened) {
mutex_unlock(&fs_devices->device_list_mutex);
continue;
}
list_for_each_entry_safe(device, tmp_device,
&fs_devices->devices, dev_list) {
@ -658,16 +661,18 @@ static void btrfs_free_stale_devices(const char *path,
continue;
/* delete the stale device */
if (fs_devices->num_devices == 1) {
btrfs_sysfs_remove_fsid(fs_devices);
list_del(&fs_devices->fs_list);
free_fs_devices(fs_devices);
fs_devices->num_devices--;
list_del(&device->dev_list);
btrfs_free_device(device);
if (fs_devices->num_devices == 0)
break;
} else {
fs_devices->num_devices--;
list_del(&device->dev_list);
btrfs_free_device(device);
}
}
mutex_unlock(&fs_devices->device_list_mutex);
if (fs_devices->num_devices == 0) {
btrfs_sysfs_remove_fsid(fs_devices);
list_del(&fs_devices->fs_list);
free_fs_devices(fs_devices);
}
}
}