Btrfs: rollback btrfs_device fields on umount

It turns out we don't properly rollback in-core btrfs_device state on
umount.  We zero out ->bdev, ->in_fs_metadata and that's about it.  In
particular, we don't zero out ->generation, and this can lead to us
refusing a mount -- a non-NULL fs_devices->latest_bdev is essential, but
btrfs_close_extra_devices will happily assign NULL to ->latest_bdev if
the first device on the dev_list happens to be missing and consequently
has no bdev attached.  This happens because since commit a6b0d5c8
btrfs_close_extra_devices adjusts ->latest_bdev, and in doing that,
relies on the ->generation.  Fix this, and possibly other problems, by
zeroing out everything except for what device_list_add sets, so that a
mount right after insmod and 'btrfs dev scan' is no different from any
later mount in this respect.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 6 insertions, 9 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d38065eca7c9..ed685991b2c1 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -674,22 +674,19 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
                 if (device->can_discard)
                         fs_devices->num_can_discard--;
 
-                new_device = kmalloc(sizeof(*new_device), GFP_NOFS);
-                BUG_ON(!new_device); /* -ENOMEM */
-                memcpy(new_device, device, sizeof(*new_device));
+                new_device = btrfs_alloc_device(NULL, &device->devid,
+                                                device->uuid);
+                BUG_ON(IS_ERR(new_device)); /* -ENOMEM */
 
                 /* Safe because we are under uuid_mutex */
                 if (device->name) {
                         name = rcu_string_strdup(device->name->str, GFP_NOFS);
-                        BUG_ON(device->name && !name); /* -ENOMEM */
+                        BUG_ON(!name); /* -ENOMEM */
                         rcu_assign_pointer(new_device->name, name);
                 }
-                new_device->bdev = NULL;
-                new_device->writeable = 0;
-                new_device->in_fs_metadata = 0;
-                new_device->can_discard = 0;
-                spin_lock_init(&new_device->io_lock);
+
                 list_replace_rcu(&device->dev_list, &new_device->dev_list);
+                new_device->fs_devices = device->fs_devices;
 
                 call_rcu(&device->rcu, free_device);
         }