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(i222-151-34-139.s42.a014.ap.plala.or.jp. [222.151.34.139]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7127add721dsm584767b3a.42.2024.08.15.00.45.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Aug 2024 00:45:14 -0700 (PDT) From: Ryusuke Konishi To: Andrew Morton Cc: linux-nilfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/4] nilfs2: add support for FS_IOC_SETFSLABEL Date: Thu, 15 Aug 2024 16:44:08 +0900 Message-Id: <20240815074408.5550-5-konishi.ryusuke@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240815074408.5550-1-konishi.ryusuke@gmail.com> References: <20240815074408.5550-1-konishi.ryusuke@gmail.com> Precedence: bulk X-Mailing-List: linux-nilfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement support for FS_IOC_SETFSLABEL ioctl to write filesystem label. Signed-off-by: Ryusuke Konishi --- fs/nilfs2/ioctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index b5c6a50d6d5d..297989e51ee6 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -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; -- 2.34.1