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bcachefs: support FS_IOC_SETFSLABEL

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Implement support for FS_IOC_SETFSLABEL ioctl to set filesystem
label.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Hongbo Li 2024-06-03 21:26:20 +08:00 committed by Kent Overstreet
parent 81bce3cf2b
commit 7a254053a5
1 changed files with 40 additions and 0 deletions
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40
fs/bcachefs/fs-ioctl.c
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@ -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;
@ -539,6 +574,10 @@ 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;
@ -584,6 +623,7 @@ 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;