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btrfs: do btrfs_free_stale_devices outside of device_list_add 

btrfs_free_stale_devices() looks for device path reused for another
filesystem, and deletes the older fs_devices::device entry.

In preparation to handle locking in device_list_add, move
btrfs_free_stale_devices outside as these two functions serve a
different purpose.

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 12:28:37 +08:00 committed by David Sterba
parent 959b1c0467
commit 4306a97449
1 changed files with 10 additions and 5 deletions
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15
fs/btrfs/volumes.c
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@ -747,7 +747,8 @@ error_brelse:
* error pointer when failed
*/
static noinline struct btrfs_device *device_list_add(const char *path,
struct btrfs_super_block *disk_super)
struct btrfs_super_block *disk_super,
bool *new_device_added)
{
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices;
@ -793,7 +794,7 @@ static noinline struct btrfs_device *device_list_add(const char *path,
mutex_unlock(&fs_devices->device_list_mutex);
device->fs_devices = fs_devices;
btrfs_free_stale_devices(path, device);
*new_device_added = true;
if (disk_super->label[0])
pr_info("BTRFS: device label %s devid %llu transid %llu %s\n",
@ -1204,6 +1205,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
struct btrfs_fs_devices **fs_devices_ret)
{
struct btrfs_super_block *disk_super;
bool new_device_added = false;
struct btrfs_device *device;
struct block_device *bdev;
struct page *page;
@ -1229,11 +1231,14 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
}
mutex_lock(&uuid_mutex);
device = device_list_add(path, disk_super);
if (IS_ERR(device))
device = device_list_add(path, disk_super, &new_device_added);
if (IS_ERR(device)) {
ret = PTR_ERR(device);
else
} else {
*fs_devices_ret = device->fs_devices;
if (new_device_added)
btrfs_free_stale_devices(path, device);
}
mutex_unlock(&uuid_mutex);
btrfs_release_disk_super(page);