Implement support for FS_IOC_SETFSLABEL ioctl to set filesystem
label.
Signed-off-by: Hongbo Li <[email protected]>
---
fs/bcachefs/fs-ioctl.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/fs/bcachefs/fs-ioctl.c b/fs/bcachefs/fs-ioctl.c
index dace11ae1931..23427a877b9a 100644
--- a/fs/bcachefs/fs-ioctl.c
+++ b/fs/bcachefs/fs-ioctl.c
@@ -301,6 +301,41 @@ static int bch2_ioc_getlabel(struct bch_fs *c, char __user
*user_label)
return ret ? -EFAULT : 0;
}
+static int bch2_ioc_setlabel(struct bch_fs *c,
+ struct file *file,
+ struct bch_inode_info *inode,
+ const char __user *user_label)
+{
+ int ret;
+ char label[BCH_SB_LABEL_SIZE];
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(label, user_label, sizeof(label)))
+ return -EFAULT;
+
+ if (strnlen(label, BCH_SB_LABEL_SIZE) == BCH_SB_LABEL_SIZE) {
+ bch_err(c,
+ "unable to set label with more than %d bytes",
+ BCH_SB_LABEL_SIZE - 1);
+ return -EINVAL;
+ }
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
+ mutex_lock(&c->sb_lock);
+ strscpy(c->disk_sb.sb->label, label, BCH_SB_LABEL_SIZE);
+ mutex_unlock(&c->sb_lock);
+
+ ret = bch2_write_super(c);
+
+ mnt_drop_write_file(file);
+ return ret;
+}
+
static int bch2_ioc_goingdown(struct bch_fs *c, u32 __user *arg)
{
u32 flags;
@@ -546,6 +581,10 @@ long bch2_fs_file_ioctl(struct file *file, unsigned cmd,
unsigned long arg)
ret = bch2_ioc_getlabel(c, (void __user *) arg);
break;
+ case FS_IOC_SETFSLABEL:
+ ret = bch2_ioc_setlabel(c, file, inode, (const void __user *)
arg);
+ break;
+
case FS_IOC_GOINGDOWN:
ret = bch2_ioc_goingdown(c, (u32 __user *) arg);
break;
@@ -591,6 +630,7 @@ long bch2_compat_fs_ioctl(struct file *file, unsigned cmd,
unsigned long arg)
cmd = FS_IOC_GETVERSION;
break;
case FS_IOC_GETFSLABEL:
+ case FS_IOC_SETFSLABEL:
break;
default:
return -ENOIOCTLCMD;
--
2.34.1
