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Btrfs: add DEVICE_READY ioctl

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This will be used in conjunction with btrfs device ready <dev>.  This is
needed for initrd's to have a nice and lightweight way to tell if all of the
devices needed for a file system are in the cache currently.  This keeps
them from having to do mount+sleep loops waiting for devices to show up.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik
2012-06-21 16:03:58 -04:00
committed by Chris Mason
parent 96c3f4331a
commit 02db0844be
4 changed files with 18 additions and 2 deletions
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1
fs/btrfs/volumes.h
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@@ -126,6 +126,7 @@ struct btrfs_fs_devices {
u64 missing_devices;
u64 total_rw_bytes;
u64 num_can_discard;
u64 total_devices;
struct block_device *latest_bdev;
/* all of the devices in the FS, protected by a mutex