diff options
Diffstat (limited to 'fs/nilfs2/ioctl.c')
| -rw-r--r-- | fs/nilfs2/ioctl.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index 8be471ce4f19..b5c6a50d6d5d 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -17,6 +17,7 @@ #include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */ #include <linux/buffer_head.h> #include <linux/fileattr.h> +#include <linux/string.h> #include "nilfs.h" #include "segment.h" #include "bmap.h" @@ -1266,6 +1267,29 @@ out: return ret; } +/** + * nilfs_ioctl_get_fslabel - get the volume name of the file system + * @sb: super block instance + * @argp: pointer to userspace memory where the volume name should be stored + * + * Return: 0 on success, %-EFAULT if copying to userspace memory fails. + */ +static int nilfs_ioctl_get_fslabel(struct super_block *sb, void __user *argp) +{ + struct the_nilfs *nilfs = sb->s_fs_info; + char label[NILFS_MAX_VOLUME_NAME + 1]; + + BUILD_BUG_ON(NILFS_MAX_VOLUME_NAME >= FSLABEL_MAX); + + down_read(&nilfs->ns_sem); + memtostr_pad(label, nilfs->ns_sbp[0]->s_volume_name); + up_read(&nilfs->ns_sem); + + if (copy_to_user(argp, label, sizeof(label))) + return -EFAULT; + return 0; +} + long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); @@ -1308,6 +1332,8 @@ long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return nilfs_ioctl_set_alloc_range(inode, argp); case FITRIM: return nilfs_ioctl_trim_fs(inode, argp); + case FS_IOC_GETFSLABEL: + return nilfs_ioctl_get_fslabel(inode->i_sb, argp); default: return -ENOTTY; } @@ -1334,6 +1360,7 @@ long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) case NILFS_IOCTL_RESIZE: case NILFS_IOCTL_SET_ALLOC_RANGE: case FITRIM: + case FS_IOC_GETFSLABEL: break; default: return -ENOIOCTLCMD; |