This patch provide a method to user to create a qgroup
in a specified type.
It use a byte of the ->create in btrfs_ioctl_qgroup_create_args
to pass the type of qgroup to kernel. Then there is a macro
named as BTRFS_QGROUP_TYPE_SHIFT to help kernel get the type
of qgroup user want to creat.
Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 12 ++++++++++--
fs/btrfs/qgroup.h | 6 ++++++
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a50f295..b1f46e8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4675,8 +4675,16 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
/* FIXME: check if the IDs really exist */
if (sa->create) {
- ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
- BTRFS_QGROUP_TYPE_DEFAULT);
+ u8 type = (sa->create >> BTRFS_QGROUP_TYPE_SHIFT);
+ if (type) {
+ if (!btrfs_fs_incompat(root->fs_info, QGROUP_TYPE)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ } else {
+ type = BTRFS_QGROUP_TYPE_DEFAULT;
+ }
+ ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, type);
} else {
ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
}
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index 75d0bb6..0be0548 100644
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -30,6 +30,12 @@
#define BTRFS_QGROUP_TYPE_DEFAULT BTRFS_QGROUP_TYPE_MIXED
/*
+ * We are using the first byte in ->create of btrfs_ioctl_qgroup_create_args
+ * to specify the type of the qgroup to be created.
+ */
+#define BTRFS_QGROUP_TYPE_SHIFT 56
+
+/*
* A description of the operations, all of these operations only happen when we
* are adding the 1st reference for that subvolume in the case of adding space
* or on the last reference delete in the case of subtraction. The only
--
1.8.4.2
--
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