Chris,
This patches add two IOCTLs to set and get labels for a mounted filesystem.
Thanks,
Morey
diff -r b68faa369602 ioctl.c
--- a/ioctl.c Wed Aug 06 14:41:23 2008 -0600
+++ b/ioctl.c Thu Aug 07 09:49:52 2008 -0600
@@ -749,6 +749,53 @@
return ret;
}
+long btrfs_ioctl_set_label(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_ioctl_label_args *label_args;
+ int ret = 0;
+
+ label_args = kmalloc(sizeof(*label_args), GFP_NOFS);
+
+ if (!label_args)
+ return -ENOMEM;
+
+ if (copy_from_user(label_args, arg, sizeof(*label_args)))
+ {
+ ret = -EFAULT;
+ } else
+ {
+ /* Everything looks good, so lets do a label change */
+ label_args->name[BTRFS_LABEL_SIZE] = 0x00;
+ trans = btrfs_start_transaction(root, 1);
+ strncpy(root->fs_info->super_copy.label, label_args->name,
BTRFS_LABEL_SIZE);
+ btrfs_commit_transaction(trans, root);
+ }
+
+ kfree(label_args);
+ return ret;
+}
+
+long btrfs_ioctl_get_label(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_ioctl_label_args *label_args;
+ int ret = 0;
+
+ label_args = kmalloc(sizeof(*label_args), GFP_NOFS);
+
+ if (!label_args)
+ return -ENOMEM;
+
+ strncpy(label_args->name, root->fs_info->super_copy.label,
BTRFS_LABEL_SIZE);
+ if (copy_to_user(arg, label_args, sizeof(*label_args)))
+ {
+ ret = -EFAULT;
+ }
+
+ kfree(label_args);
+ return ret;
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
@@ -773,6 +820,10 @@
return btrfs_ioctl_trans_start(file);
case BTRFS_IOC_TRANS_END:
return btrfs_ioctl_trans_end(file);
+ case BTRFS_IOC_SET_LABEL:
+ return btrfs_ioctl_set_label(root, (void __user *)arg);
+ case BTRFS_IOC_GET_LABEL:
+ return btrfs_ioctl_get_label(root, (void __user *)arg);
case BTRFS_IOC_SYNC:
btrfs_start_delalloc_inodes(root);
btrfs_sync_fs(file->f_dentry->d_sb, 1);
diff -r b68faa369602 ioctl.h
--- a/ioctl.h Wed Aug 06 14:41:23 2008 -0600
+++ b/ioctl.h Thu Aug 07 09:49:52 2008 -0600
@@ -28,6 +28,10 @@
char name[BTRFS_PATH_NAME_MAX + 1];
};
+struct btrfs_ioctl_label_args {
+ char name[BTRFS_LABEL_SIZE + 1];
+};
+
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -52,4 +56,10 @@
#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
struct btrfs_ioctl_vol_args)
+/* Used to set and get the current volume label */
+#define BTRFS_IOC_SET_LABEL _IOW(BTRFS_IOCTL_MAGIC, 13, \
+ struct btrfs_ioctl_label_args)
+#define BTRFS_IOC_GET_LABEL _IOW(BTRFS_IOCTL_MAGIC, 14, \
+ struct btrfs_ioctl_label_args)
+
#endif
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