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[86.101.169.67]) by smtp.gmail.com with ESMTPSA id r4sm9793117ejd.125.2021.03.22.07.49.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Mar 2021 07:49:24 -0700 (PDT) From: Miklos Szeredi To: linux-fsdevel@vger.kernel.org Cc: Al Viro , linux-kernel@vger.kernel.org, Christoph Hellwig , Jan Kara Subject: [PATCH v2 05/18] ext2: convert to miscattr Date: Mon, 22 Mar 2021 15:49:03 +0100 Message-Id: <20210322144916.137245-6-mszeredi@redhat.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210322144916.137245-1-mszeredi@redhat.com> References: <20210322144916.137245-1-mszeredi@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use the miscattr API to let the VFS handle locking, permission checking and conversion. Signed-off-by: Miklos Szeredi Cc: Jan Kara --- fs/ext2/ext2.h | 7 ++-- fs/ext2/file.c | 2 ++ fs/ext2/ioctl.c | 88 ++++++++++++++++++------------------------------- fs/ext2/namei.c | 2 ++ 4 files changed, 39 insertions(+), 60 deletions(-) diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h index 3309fb2d327a..b58f27b1412b 100644 --- a/fs/ext2/ext2.h +++ b/fs/ext2/ext2.h @@ -283,8 +283,6 @@ static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) /* * ioctl commands */ -#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS -#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) @@ -293,8 +291,6 @@ static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) /* * ioctl commands in 32 bit emulation */ -#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS -#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION @@ -772,6 +768,9 @@ extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len); /* ioctl.c */ +extern int ext2_miscattr_get(struct dentry *dentry, struct miscattr *ma); +extern int ext2_miscattr_set(struct user_namespace *mnt_userns, + struct dentry *dentry, struct miscattr *ma); extern long ext2_ioctl(struct file *, unsigned int, unsigned long); extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); diff --git a/fs/ext2/file.c b/fs/ext2/file.c index 96044f5dbc0e..096c03612129 100644 --- a/fs/ext2/file.c +++ b/fs/ext2/file.c @@ -204,4 +204,6 @@ const struct inode_operations ext2_file_inode_operations = { .get_acl = ext2_get_acl, .set_acl = ext2_set_acl, .fiemap = ext2_fiemap, + .miscattr_get = ext2_miscattr_get, + .miscattr_set = ext2_miscattr_set, }; diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c index b399cbb7022d..f841d4439c62 100644 --- a/fs/ext2/ioctl.c +++ b/fs/ext2/ioctl.c @@ -16,69 +16,51 @@ #include #include #include +#include - -long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +int ext2_miscattr_get(struct dentry *dentry, struct miscattr *ma) { - struct inode *inode = file_inode(filp); - struct ext2_inode_info *ei = EXT2_I(inode); - unsigned int flags; - unsigned short rsv_window_size; - int ret; + struct ext2_inode_info *ei = EXT2_I(d_inode(dentry)); - ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); + miscattr_fill_flags(ma, ei->i_flags & EXT2_FL_USER_VISIBLE); - switch (cmd) { - case EXT2_IOC_GETFLAGS: - flags = ei->i_flags & EXT2_FL_USER_VISIBLE; - return put_user(flags, (int __user *) arg); - case EXT2_IOC_SETFLAGS: { - unsigned int oldflags; + return 0; +} - ret = mnt_want_write_file(filp); - if (ret) - return ret; +int ext2_miscattr_set(struct user_namespace *mnt_userns, + struct dentry *dentry, struct miscattr *ma) +{ + struct inode *inode = d_inode(dentry); + struct ext2_inode_info *ei = EXT2_I(inode); - if (!inode_owner_or_capable(&init_user_ns, inode)) { - ret = -EACCES; - goto setflags_out; - } + if (miscattr_has_xattr(ma)) + return -EOPNOTSUPP; - if (get_user(flags, (int __user *) arg)) { - ret = -EFAULT; - goto setflags_out; - } + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) + return -EPERM; - flags = ext2_mask_flags(inode->i_mode, flags); + ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) | + (ma->flags & EXT2_FL_USER_MODIFIABLE); - inode_lock(inode); - /* Is it quota file? Do not allow user to mess with it */ - if (IS_NOQUOTA(inode)) { - inode_unlock(inode); - ret = -EPERM; - goto setflags_out; - } - oldflags = ei->i_flags; + ext2_set_inode_flags(inode); + inode->i_ctime = current_time(inode); + mark_inode_dirty(inode); - ret = vfs_ioc_setflags_prepare(inode, oldflags, flags); - if (ret) { - inode_unlock(inode); - goto setflags_out; - } + return 0; +} - flags = flags & EXT2_FL_USER_MODIFIABLE; - flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; - ei->i_flags = flags; - ext2_set_inode_flags(inode); - inode->i_ctime = current_time(inode); - inode_unlock(inode); +long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = file_inode(filp); + struct ext2_inode_info *ei = EXT2_I(inode); + unsigned short rsv_window_size; + int ret; - mark_inode_dirty(inode); -setflags_out: - mnt_drop_write_file(filp); - return ret; - } + ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); + + switch (cmd) { case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *) arg); case EXT2_IOC_SETVERSION: { @@ -163,12 +145,6 @@ long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { /* These are just misnamed, they actually get/put from/to user an int */ switch (cmd) { - case EXT2_IOC32_GETFLAGS: - cmd = EXT2_IOC_GETFLAGS; - break; - case EXT2_IOC32_SETFLAGS: - cmd = EXT2_IOC_SETFLAGS; - break; case EXT2_IOC32_GETVERSION: cmd = EXT2_IOC_GETVERSION; break; diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c index 3367384d344d..c0fd2e025d49 100644 --- a/fs/ext2/namei.c +++ b/fs/ext2/namei.c @@ -427,6 +427,8 @@ const struct inode_operations ext2_dir_inode_operations = { .get_acl = ext2_get_acl, .set_acl = ext2_set_acl, .tmpfile = ext2_tmpfile, + .miscattr_get = ext2_miscattr_get, + .miscattr_set = ext2_miscattr_set, }; const struct inode_operations ext2_special_inode_operations = { -- 2.30.2