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nilfs2: add support for FS_IOC_SETFSLABEL

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Implement support for FS_IOC_SETFSLABEL ioctl to write filesystem label.

Link: https://lkml.kernel.org/r/20240815074408.5550-5-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ryusuke Konishi
2024-08-15 16:44:08 +09:00
committed by Andrew Morton
parent 4b901256a7
commit 79785f7801
1 changed files with 65 additions and 0 deletions
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65
fs/nilfs2/ioctl.c
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@@ -1290,6 +1290,68 @@ static int nilfs_ioctl_get_fslabel(struct super_block *sb, void __user *argp)
return 0;
}
/**
* nilfs_ioctl_set_fslabel - set the volume name of the file system
* @sb: super block instance
* @filp: file object
* @argp: pointer to userspace memory that contains the volume name
*
* Return: 0 on success, or the following negative error code on failure.
* * %-EFAULT - Error copying input data.
* * %-EINVAL - Label length exceeds record size in superblock.
* * %-EIO - I/O error.
* * %-EPERM - Operation not permitted (insufficient permissions).
* * %-EROFS - Read only file system.
*/
static int nilfs_ioctl_set_fslabel(struct super_block *sb, struct file *filp,
void __user *argp)
{
char label[NILFS_MAX_VOLUME_NAME + 1];
struct the_nilfs *nilfs = sb->s_fs_info;
struct nilfs_super_block **sbp;
size_t len;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = mnt_want_write_file(filp);
if (ret)
return ret;
if (copy_from_user(label, argp, NILFS_MAX_VOLUME_NAME + 1)) {
ret = -EFAULT;
goto out_drop_write;
}
len = strnlen(label, NILFS_MAX_VOLUME_NAME + 1);
if (len > NILFS_MAX_VOLUME_NAME) {
nilfs_err(sb, "unable to set label with more than %zu bytes",
NILFS_MAX_VOLUME_NAME);
ret = -EINVAL;
goto out_drop_write;
}
down_write(&nilfs->ns_sem);
sbp = nilfs_prepare_super(sb, false);
if (unlikely(!sbp)) {
ret = -EIO;
goto out_unlock;
}
strtomem_pad(sbp[0]->s_volume_name, label, 0);
if (sbp[1])
strtomem_pad(sbp[1]->s_volume_name, label, 0);
ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
out_unlock:
up_write(&nilfs->ns_sem);
out_drop_write:
mnt_drop_write_file(filp);
return ret;
}
long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -1334,6 +1396,8 @@ long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return nilfs_ioctl_trim_fs(inode, argp);
case FS_IOC_GETFSLABEL:
return nilfs_ioctl_get_fslabel(inode->i_sb, argp);
case FS_IOC_SETFSLABEL:
return nilfs_ioctl_set_fslabel(inode->i_sb, filp, argp);
default:
return -ENOTTY;
}
@@ -1361,6 +1425,7 @@ long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case NILFS_IOCTL_SET_ALLOC_RANGE:
case FITRIM:
case FS_IOC_GETFSLABEL:
case FS_IOC_SETFSLABEL:
break;
default:
return -ENOIOCTLCMD;