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| author | Josef Bacik | 2012-06-21 22:03:58 +0200 |
|---|---|---|
| committer | Chris Mason | 2012-07-23 22:27:42 +0200 |
| commit | 02db0844beffc1c4e99d750be58ffb3ed95d6d62 (patch) | |
| tree | ee82fa926f2900e24a1ca76eab6a85a32f453898 /fs/btrfs/super.c | |
| parent | Btrfs: flush delayed inodes if we're short on space (diff) | |
| download | kernel-qcow2-linux-02db0844beffc1c4e99d750be58ffb3ed95d6d62.tar.gz kernel-qcow2-linux-02db0844beffc1c4e99d750be58ffb3ed95d6d62.tar.xz kernel-qcow2-linux-02db0844beffc1c4e99d750be58ffb3ed95d6d62.zip | |
Btrfs: add DEVICE_READY ioctl
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>
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 88a2d2bb2d75..26da344231ac 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1462,6 +1462,13 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, ret = btrfs_scan_one_device(vol->name, FMODE_READ, &btrfs_fs_type, &fs_devices); break; + case BTRFS_IOC_DEVICES_READY: + ret = btrfs_scan_one_device(vol->name, FMODE_READ, + &btrfs_fs_type, &fs_devices); + if (ret) + break; + ret = !(fs_devices->num_devices == fs_devices->total_devices); + break; } kfree(vol); |