diff mbox series

[2/4] vfs: create a generic checking function for FS_IOC_FSSETXATTR

Message ID 156116138952.1664814.16552129914959122837.stgit@magnolia (mailing list archive)
State New, archived
Headers show
Series vfs: clean up SETFLAGS and FSSETXATTR option processing | expand

Commit Message

Darrick J. Wong June 21, 2019, 11:56 p.m. UTC 
From: Darrick J. Wong <darrick.wong@oracle.com>

Create a generic checking function for the incoming FS_IOC_FSSETXATTR
fsxattr values so that we can standardize some of the implementation
behaviors.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/btrfs/ioctl.c   |   21 +++++++++-------
 fs/ext4/ioctl.c    |   27 ++++++++++++++------
 fs/f2fs/file.c     |   26 ++++++++++++++-----
 fs/inode.c         |   17 +++++++++++++
 fs/xfs/xfs_ioctl.c |   70 ++++++++++++++++++++++++++++++----------------------
 include/linux/fs.h |    3 ++
 6 files changed, 111 insertions(+), 53 deletions(-)

Comments

Christoph Hellwig June 25, 2019, 10:57 a.m. UTC | #1 
On Fri, Jun 21, 2019 at 04:56:29PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Create a generic checking function for the incoming FS_IOC_FSSETXATTR
> fsxattr values so that we can standardize some of the implementation
> behaviors.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> Reviewed-by: Jan Kara <jack@suse.cz>
> ---
>  fs/btrfs/ioctl.c   |   21 +++++++++-------
>  fs/ext4/ioctl.c    |   27 ++++++++++++++------
>  fs/f2fs/file.c     |   26 ++++++++++++++-----
>  fs/inode.c         |   17 +++++++++++++
>  fs/xfs/xfs_ioctl.c |   70 ++++++++++++++++++++++++++++++----------------------
>  include/linux/fs.h |    3 ++
>  6 files changed, 111 insertions(+), 53 deletions(-)
> 
> 
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index f408aa93b0cf..7ddda5b4b6a6 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -366,6 +366,13 @@ static int check_xflags(unsigned int flags)
>  	return 0;
>  }
>  
> +static void __btrfs_ioctl_fsgetxattr(struct btrfs_inode *binode,
> +				     struct fsxattr *fa)
> +{
> +	memset(fa, 0, sizeof(*fa));
> +	fa->fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);

Is there really much of a point in this helper? Epeciall as
the zeroing could easily be done in the variable declaration
line using

	struct fsxattr fa = { };

> +	memset(fa, 0, sizeof(struct fsxattr));
> +	fa->fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);

Overly lone line.

> +	if (ext4_has_feature_project(inode->i_sb)) {
> +		fa->fsx_projid = (__u32)from_kprojid(&init_user_ns,
> +				ei->i_projid);

The cast here looks bogus.  Same comment for f2fs.
David Sterba June 25, 2019, 5:02 p.m. UTC | #2 
On Tue, Jun 25, 2019 at 03:57:25AM -0700, Christoph Hellwig wrote:
> On Fri, Jun 21, 2019 at 04:56:29PM -0700, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@oracle.com>
> > 
> > Create a generic checking function for the incoming FS_IOC_FSSETXATTR
> > fsxattr values so that we can standardize some of the implementation
> > behaviors.
> > 
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > Reviewed-by: Jan Kara <jack@suse.cz>
> > ---
> >  fs/btrfs/ioctl.c   |   21 +++++++++-------
> >  fs/ext4/ioctl.c    |   27 ++++++++++++++------
> >  fs/f2fs/file.c     |   26 ++++++++++++++-----
> >  fs/inode.c         |   17 +++++++++++++
> >  fs/xfs/xfs_ioctl.c |   70 ++++++++++++++++++++++++++++++----------------------
> >  include/linux/fs.h |    3 ++
> >  6 files changed, 111 insertions(+), 53 deletions(-)
> > 
> > 
> > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> > index f408aa93b0cf..7ddda5b4b6a6 100644
> > --- a/fs/btrfs/ioctl.c
> > +++ b/fs/btrfs/ioctl.c
> > @@ -366,6 +366,13 @@ static int check_xflags(unsigned int flags)
> >  	return 0;
> >  }
> >  
> > +static void __btrfs_ioctl_fsgetxattr(struct btrfs_inode *binode,
> > +				     struct fsxattr *fa)
> > +{
> > +	memset(fa, 0, sizeof(*fa));
> > +	fa->fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
> 
> Is there really much of a point in this helper? Epeciall as
> the zeroing could easily be done in the variable declaration
> line using
> 
> 	struct fsxattr fa = { };

Agreed, not counting the initialization the wrapper is merely another
name for btrfs_inode_flags_to_xflags. I also find it slightly confusing
that __btrfs_ioctl_fsgetxattr name is too close to the ioctl callback
implementation btrfs_ioctl_fsgetxattr but only does some initialization.
Darrick J. Wong June 25, 2019, 5:16 p.m. UTC | #3 
On Tue, Jun 25, 2019 at 07:02:48PM +0200, David Sterba wrote:
> On Tue, Jun 25, 2019 at 03:57:25AM -0700, Christoph Hellwig wrote:
> > On Fri, Jun 21, 2019 at 04:56:29PM -0700, Darrick J. Wong wrote:
> > > From: Darrick J. Wong <darrick.wong@oracle.com>
> > > 
> > > Create a generic checking function for the incoming FS_IOC_FSSETXATTR
> > > fsxattr values so that we can standardize some of the implementation
> > > behaviors.
> > > 
> > > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > > Reviewed-by: Jan Kara <jack@suse.cz>
> > > ---
> > >  fs/btrfs/ioctl.c   |   21 +++++++++-------
> > >  fs/ext4/ioctl.c    |   27 ++++++++++++++------
> > >  fs/f2fs/file.c     |   26 ++++++++++++++-----
> > >  fs/inode.c         |   17 +++++++++++++
> > >  fs/xfs/xfs_ioctl.c |   70 ++++++++++++++++++++++++++++++----------------------
> > >  include/linux/fs.h |    3 ++
> > >  6 files changed, 111 insertions(+), 53 deletions(-)
> > > 
> > > 
> > > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> > > index f408aa93b0cf..7ddda5b4b6a6 100644
> > > --- a/fs/btrfs/ioctl.c
> > > +++ b/fs/btrfs/ioctl.c
> > > @@ -366,6 +366,13 @@ static int check_xflags(unsigned int flags)
> > >  	return 0;
> > >  }
> > >  
> > > +static void __btrfs_ioctl_fsgetxattr(struct btrfs_inode *binode,
> > > +				     struct fsxattr *fa)
> > > +{
> > > +	memset(fa, 0, sizeof(*fa));
> > > +	fa->fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
> > 
> > Is there really much of a point in this helper? Epeciall as
> > the zeroing could easily be done in the variable declaration
> > line using
> > 
> > 	struct fsxattr fa = { };
> 
> Agreed, not counting the initialization the wrapper is merely another
> name for btrfs_inode_flags_to_xflags. I also find it slightly confusing
> that __btrfs_ioctl_fsgetxattr name is too close to the ioctl callback
> implementation btrfs_ioctl_fsgetxattr but only does some initialization.

Ok; it's easily enough changed to:

	struct fsxattr old_fa = {
		.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags),
	};

--D
diff mbox series

Patch

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index f408aa93b0cf..7ddda5b4b6a6 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -366,6 +366,13 @@  static int check_xflags(unsigned int flags)
 	return 0;
 }
 
+static void __btrfs_ioctl_fsgetxattr(struct btrfs_inode *binode,
+				     struct fsxattr *fa)
+{
+	memset(fa, 0, sizeof(*fa));
+	fa->fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
+}
+
 /*
  * Set the xflags from the internal inode flags. The remaining items of fsxattr
  * are zeroed.
@@ -375,8 +382,7 @@  static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
 	struct btrfs_inode *binode = BTRFS_I(file_inode(file));
 	struct fsxattr fa;
 
-	memset(&fa, 0, sizeof(fa));
-	fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
+	__btrfs_ioctl_fsgetxattr(binode, &fa);
 
 	if (copy_to_user(arg, &fa, sizeof(fa)))
 		return -EFAULT;
@@ -390,7 +396,7 @@  static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
 	struct btrfs_inode *binode = BTRFS_I(inode);
 	struct btrfs_root *root = binode->root;
 	struct btrfs_trans_handle *trans;
-	struct fsxattr fa;
+	struct fsxattr fa, old_fa;
 	unsigned old_flags;
 	unsigned old_i_flags;
 	int ret = 0;
@@ -421,13 +427,10 @@  static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
 	old_flags = binode->flags;
 	old_i_flags = inode->i_flags;
 
-	/* We need the capabilities to change append-only or immutable inode */
-	if (((old_flags & (BTRFS_INODE_APPEND | BTRFS_INODE_IMMUTABLE)) ||
-	     (fa.fsx_xflags & (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE))) &&
-	    !capable(CAP_LINUX_IMMUTABLE)) {
-		ret = -EPERM;
+	__btrfs_ioctl_fsgetxattr(binode, &old_fa);
+	ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
+	if (ret)
 		goto out_unlock;
-	}
 
 	if (fa.fsx_xflags & FS_XFLAG_SYNC)
 		binode->flags |= BTRFS_INODE_SYNC;
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 5126ee351a84..c2f48c90ca45 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -721,6 +721,19 @@  static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 	return 0;
 }
 
+static void ext4_fsgetxattr(struct inode *inode, struct fsxattr *fa)
+{
+	struct ext4_inode_info *ei = EXT4_I(inode);
+
+	memset(fa, 0, sizeof(struct fsxattr));
+	fa->fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
+
+	if (ext4_has_feature_project(inode->i_sb)) {
+		fa->fsx_projid = (__u32)from_kprojid(&init_user_ns,
+				ei->i_projid);
+	}
+}
+
 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
@@ -1089,13 +1102,7 @@  long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	{
 		struct fsxattr fa;
 
-		memset(&fa, 0, sizeof(struct fsxattr));
-		fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
-
-		if (ext4_has_feature_project(inode->i_sb)) {
-			fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
-				EXT4_I(inode)->i_projid);
-		}
+		ext4_fsgetxattr(inode, &fa);
 
 		if (copy_to_user((struct fsxattr __user *)arg,
 				 &fa, sizeof(fa)))
@@ -1104,7 +1111,7 @@  long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	}
 	case EXT4_IOC_FSSETXATTR:
 	{
-		struct fsxattr fa;
+		struct fsxattr fa, old_fa;
 		int err;
 
 		if (copy_from_user(&fa, (struct fsxattr __user *)arg,
@@ -1127,7 +1134,11 @@  long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			return err;
 
 		inode_lock(inode);
+		ext4_fsgetxattr(inode, &old_fa);
 		err = ext4_ioctl_check_project(inode, &fa);
+		if (err)
+			goto out;
+		err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
 		if (err)
 			goto out;
 		flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index a969d5497e03..f707de6bd4a8 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2773,19 +2773,26 @@  static inline unsigned long f2fs_xflags_to_iflags(__u32 xflags)
 	return iflags;
 }
 
-static int f2fs_ioc_fsgetxattr(struct file *filp, unsigned long arg)
+static void __f2fs_ioc_fsgetxattr(struct inode *inode,
+				  struct fsxattr *fa)
 {
-	struct inode *inode = file_inode(filp);
 	struct f2fs_inode_info *fi = F2FS_I(inode);
-	struct fsxattr fa;
 
-	memset(&fa, 0, sizeof(struct fsxattr));
-	fa.fsx_xflags = f2fs_iflags_to_xflags(fi->i_flags &
+	memset(fa, 0, sizeof(struct fsxattr));
+	fa->fsx_xflags = f2fs_iflags_to_xflags(fi->i_flags &
 				F2FS_FL_USER_VISIBLE);
 
 	if (f2fs_sb_has_project_quota(F2FS_I_SB(inode)))
-		fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
+		fa->fsx_projid = (__u32)from_kprojid(&init_user_ns,
 							fi->i_projid);
+}
+
+static int f2fs_ioc_fsgetxattr(struct file *filp, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct fsxattr fa;
+
+	__f2fs_ioc_fsgetxattr(inode, &fa);
 
 	if (copy_to_user((struct fsxattr __user *)arg, &fa, sizeof(fa)))
 		return -EFAULT;
@@ -2820,7 +2827,7 @@  static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
 	struct f2fs_inode_info *fi = F2FS_I(inode);
-	struct fsxattr fa;
+	struct fsxattr fa, old_fa;
 	unsigned int flags;
 	int err;
 
@@ -2844,6 +2851,11 @@  static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
 
 	inode_lock(inode);
 	err = f2fs_ioctl_check_project(inode, &fa);
+	if (err)
+		goto out;
+
+	__f2fs_ioc_fsgetxattr(inode, &old_fa);
+	err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
 	if (err)
 		goto out;
 	flags = (fi->i_flags & ~F2FS_FL_XFLAG_VISIBLE) |
diff --git a/fs/inode.c b/fs/inode.c
index 403ddbb81335..ddfe60679b53 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2207,3 +2207,20 @@  int vfs_ioc_setflags_check(struct inode *inode, int oldflags, int flags)
 	return 0;
 }
 EXPORT_SYMBOL(vfs_ioc_setflags_check);
+
+/* Generic function to check FS_IOC_FSSETXATTR values. */
+int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
+			     struct fsxattr *fa)
+{
+	/*
+	 * Can't modify an immutable/append-only file unless we have
+	 * appropriate permission.
+	 */
+	if ((old_fa->fsx_xflags ^ fa->fsx_xflags) &
+			(FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND) &&
+	    !capable(CAP_LINUX_IMMUTABLE))
+		return -EPERM;
+
+	return 0;
+}
+EXPORT_SYMBOL(vfs_ioc_fssetxattr_check);
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index d7dfc13f30f5..08c24f2f55c3 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -879,37 +879,45 @@  xfs_di2lxflags(
 	return flags;
 }
 
-STATIC int
-xfs_ioc_fsgetxattr(
-	xfs_inode_t		*ip,
-	int			attr,
-	void			__user *arg)
+static void
+__xfs_ioc_fsgetxattr(
+	struct xfs_inode	*ip,
+	bool			attr,
+	struct fsxattr		*fa)
 {
-	struct fsxattr		fa;
-
-	memset(&fa, 0, sizeof(struct fsxattr));
-
-	xfs_ilock(ip, XFS_ILOCK_SHARED);
-	fa.fsx_xflags = xfs_ip2xflags(ip);
-	fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
-	fa.fsx_cowextsize = ip->i_d.di_cowextsize <<
+	memset(fa, 0, sizeof(struct fsxattr));
+	fa->fsx_xflags = xfs_ip2xflags(ip);
+	fa->fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;
+	fa->fsx_cowextsize = ip->i_d.di_cowextsize <<
 			ip->i_mount->m_sb.sb_blocklog;
-	fa.fsx_projid = xfs_get_projid(ip);
+	fa->fsx_projid = xfs_get_projid(ip);
 
 	if (attr) {
 		if (ip->i_afp) {
 			if (ip->i_afp->if_flags & XFS_IFEXTENTS)
-				fa.fsx_nextents = xfs_iext_count(ip->i_afp);
+				fa->fsx_nextents = xfs_iext_count(ip->i_afp);
 			else
-				fa.fsx_nextents = ip->i_d.di_anextents;
+				fa->fsx_nextents = ip->i_d.di_anextents;
 		} else
-			fa.fsx_nextents = 0;
+			fa->fsx_nextents = 0;
 	} else {
 		if (ip->i_df.if_flags & XFS_IFEXTENTS)
-			fa.fsx_nextents = xfs_iext_count(&ip->i_df);
+			fa->fsx_nextents = xfs_iext_count(&ip->i_df);
 		else
-			fa.fsx_nextents = ip->i_d.di_nextents;
+			fa->fsx_nextents = ip->i_d.di_nextents;
 	}
+}
+
+STATIC int
+xfs_ioc_fsgetxattr(
+	xfs_inode_t		*ip,
+	int			attr,
+	void			__user *arg)
+{
+	struct fsxattr		fa;
+
+	xfs_ilock(ip, XFS_ILOCK_SHARED);
+	__xfs_ioc_fsgetxattr(ip, attr, &fa);
 	xfs_iunlock(ip, XFS_ILOCK_SHARED);
 
 	if (copy_to_user(arg, &fa, sizeof(fa)))
@@ -1035,15 +1043,6 @@  xfs_ioctl_setattr_xflags(
 	if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip))
 		return -EINVAL;
 
-	/*
-	 * Can't modify an immutable/append-only file unless
-	 * we have appropriate permission.
-	 */
-	if (((ip->i_d.di_flags & (XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND)) ||
-	     (fa->fsx_xflags & (FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND))) &&
-	    !capable(CAP_LINUX_IMMUTABLE))
-		return -EPERM;
-
 	/* diflags2 only valid for v3 inodes. */
 	di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags);
 	if (di_flags2 && ip->i_d.di_version < 3)
@@ -1323,6 +1322,7 @@  xfs_ioctl_setattr(
 	xfs_inode_t		*ip,
 	struct fsxattr		*fa)
 {
+	struct fsxattr		old_fa;
 	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_trans	*tp;
 	struct xfs_dquot	*udqp = NULL;
@@ -1370,7 +1370,6 @@  xfs_ioctl_setattr(
 		goto error_free_dquots;
 	}
 
-
 	if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) &&
 	    xfs_get_projid(ip) != fa->fsx_projid) {
 		code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp,
@@ -1379,6 +1378,11 @@  xfs_ioctl_setattr(
 			goto error_trans_cancel;
 	}
 
+	__xfs_ioc_fsgetxattr(ip, false, &old_fa);
+	code = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, fa);
+	if (code)
+		goto error_trans_cancel;
+
 	code = xfs_ioctl_setattr_check_extsize(ip, fa);
 	if (code)
 		goto error_trans_cancel;
@@ -1489,6 +1493,7 @@  xfs_ioc_setxflags(
 {
 	struct xfs_trans	*tp;
 	struct fsxattr		fa;
+	struct fsxattr		old_fa;
 	unsigned int		flags;
 	int			join_flags = 0;
 	int			error;
@@ -1524,6 +1529,13 @@  xfs_ioc_setxflags(
 		goto out_drop_write;
 	}
 
+	__xfs_ioc_fsgetxattr(ip, false, &old_fa);
+	error = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, &fa);
+	if (error) {
+		xfs_trans_cancel(tp);
+		goto out_drop_write;
+	}
+
 	error = xfs_ioctl_setattr_xflags(tp, ip, &fa);
 	if (error) {
 		xfs_trans_cancel(tp);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4d6feee18778..0c3ef24afe22 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3557,4 +3557,7 @@  static inline struct sock *io_uring_get_socket(struct file *file)
 
 int vfs_ioc_setflags_check(struct inode *inode, int oldflags, int flags);
 
+int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
+			     struct fsxattr *fa);
+
 #endif /* _LINUX_FS_H */