[07/11] ubifs: Add support for FS_IOC_FS[SG]ETXATTR ioctls
diff mbox series

Message ID 20190814121834.13983-8-s.hauer@pengutronix.de
State Changes Requested
Headers show
Series
  • Add quota support to UBIFS
Related show

Commit Message

Sascha Hauer Aug. 14, 2019, 12:18 p.m. UTC
The FS_IOC_FS[SG]ETXATTR ioctls are an alternative to FS_IOC_[GS]ETFLAGS
with additional features. This patch adds support for these ioctls.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 fs/ubifs/ioctl.c | 89 +++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 84 insertions(+), 5 deletions(-)

Comments

Mainz, Roland Aug. 14, 2019, 2:11 p.m. UTC | #1
> -----Original Message-----
> From: linux-mtd [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of
> Sascha Hauer
> Sent: Wednesday, August 14, 2019 2:19 PM
> To: linux-fsdevel@vger.kernel.org
> Cc: Richard Weinberger <richard@nod.at>; Sascha Hauer
> <s.hauer@pengutronix.de>; linux-mtd@lists.infradead.org;
> kernel@pengutronix.de; Jan Kara <jack@suse.com>
> Subject: [PATCH 07/11] ubifs: Add support for FS_IOC_FS[SG]ETXATTR ioctls
> 
> The FS_IOC_FS[SG]ETXATTR ioctls are an alternative to FS_IOC_[GS]ETFLAGS
> with additional features. This patch adds support for these ioctls.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  fs/ubifs/ioctl.c | 89
> +++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 84 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c index
> b9c4a51bceea..121aa1003e24 100644
> --- a/fs/ubifs/ioctl.c
> +++ b/fs/ubifs/ioctl.c
> @@ -95,9 +95,39 @@ static int ubifs2ioctl(int ubifs_flags)
>  	return ioctl_flags;
>  }
> 
> -static int setflags(struct file *file, int flags)
> +/* Transfer xflags flags to internal */ static inline unsigned long
> +ubifs_xflags_to_iflags(__u32 xflags)
>  {
> -	int oldflags, err, release;
> +	unsigned long iflags = 0;
> +
> +	if (xflags & FS_XFLAG_SYNC)
> +		iflags |= UBIFS_APPEND_FL;

Erm... what does |FS_XFLAG_SYNC| have to do with |*APPEND| ? Is this a typo ?

----

Bye,
Roland
Sascha Hauer Aug. 15, 2019, 7:31 a.m. UTC | #2
On Wed, Aug 14, 2019 at 02:11:08PM +0000, Mainz, Roland wrote:
> 
> 
> 
> > -----Original Message-----
> > From: linux-mtd [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of
> > Sascha Hauer
> > Sent: Wednesday, August 14, 2019 2:19 PM
> > To: linux-fsdevel@vger.kernel.org
> > Cc: Richard Weinberger <richard@nod.at>; Sascha Hauer
> > <s.hauer@pengutronix.de>; linux-mtd@lists.infradead.org;
> > kernel@pengutronix.de; Jan Kara <jack@suse.com>
> > Subject: [PATCH 07/11] ubifs: Add support for FS_IOC_FS[SG]ETXATTR ioctls
> > 
> > The FS_IOC_FS[SG]ETXATTR ioctls are an alternative to FS_IOC_[GS]ETFLAGS
> > with additional features. This patch adds support for these ioctls.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> > ---
> >  fs/ubifs/ioctl.c | 89
> > +++++++++++++++++++++++++++++++++++++++++++++---
> >  1 file changed, 84 insertions(+), 5 deletions(-)
> > 
> > diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c index
> > b9c4a51bceea..121aa1003e24 100644
> > --- a/fs/ubifs/ioctl.c
> > +++ b/fs/ubifs/ioctl.c
> > @@ -95,9 +95,39 @@ static int ubifs2ioctl(int ubifs_flags)
> >  	return ioctl_flags;
> >  }
> > 
> > -static int setflags(struct file *file, int flags)
> > +/* Transfer xflags flags to internal */ static inline unsigned long
> > +ubifs_xflags_to_iflags(__u32 xflags)
> >  {
> > -	int oldflags, err, release;
> > +	unsigned long iflags = 0;
> > +
> > +	if (xflags & FS_XFLAG_SYNC)
> > +		iflags |= UBIFS_APPEND_FL;
> 
> Erm... what does |FS_XFLAG_SYNC| have to do with |*APPEND| ? Is this a typo ?

Hm, some copy-paste accident probably. That's rubbish of course.

Sascha

Patch
diff mbox series

diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c
index b9c4a51bceea..121aa1003e24 100644
--- a/fs/ubifs/ioctl.c
+++ b/fs/ubifs/ioctl.c
@@ -95,9 +95,39 @@  static int ubifs2ioctl(int ubifs_flags)
 	return ioctl_flags;
 }
 
-static int setflags(struct file *file, int flags)
+/* Transfer xflags flags to internal */
+static inline unsigned long ubifs_xflags_to_iflags(__u32 xflags)
 {
-	int oldflags, err, release;
+	unsigned long iflags = 0;
+
+	if (xflags & FS_XFLAG_SYNC)
+		iflags |= UBIFS_APPEND_FL;
+	if (xflags & FS_XFLAG_IMMUTABLE)
+		iflags |= UBIFS_IMMUTABLE_FL;
+	if (xflags & FS_XFLAG_APPEND)
+		iflags |= UBIFS_APPEND_FL;
+
+        return iflags;
+}
+
+/* Transfer internal flags to xflags */
+static inline __u32 ubifs_iflags_to_xflags(unsigned long flags)
+{
+	__u32 xflags = 0;
+
+	if (flags & UBIFS_APPEND_FL)
+		xflags |= FS_XFLAG_SYNC;
+	if (flags & UBIFS_IMMUTABLE_FL)
+		xflags |= FS_XFLAG_IMMUTABLE;
+	if (flags & UBIFS_APPEND_FL)
+		xflags |= FS_XFLAG_APPEND;
+
+        return xflags;
+}
+
+static int setflags(struct file *file, int flags, struct fsxattr *fa)
+{
+	int ubi_flags, oldflags, err, release;
 	struct inode *inode = file_inode(file);
 	struct ubifs_inode *ui = ubifs_inode(inode);
 	struct ubifs_info *c = inode->i_sb->s_fs_info;
@@ -110,6 +140,11 @@  static int setflags(struct file *file, int flags)
 	if (!inode_owner_or_capable(inode))
 		return -EACCES;
 
+	if (fa)
+		ubi_flags = ubifs_xflags_to_iflags(fa->fsx_xflags);
+	else
+		ubi_flags = ioctl2ubifs(flags);
+
 	/*
 	 * Make sure the file-system is read-write and make sure it
 	 * will not become read-only while we are changing the flags.
@@ -126,11 +161,11 @@  static int setflags(struct file *file, int flags)
 
 	mutex_lock(&ui->ui_mutex);
 	oldflags = ubifs2ioctl(ui->flags);
-	err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
+	err = vfs_ioc_setflags_prepare(inode, oldflags, ubifs2ioctl(ubi_flags));
 	if (err)
 		goto out_unlock;
 
-	ui->flags = ioctl2ubifs(flags);
+	ui->flags = ubi_flags;
 	ubifs_set_inode_flags(inode);
 	inode->i_ctime = current_time(inode);
 	release = ui->dirty;
@@ -156,6 +191,44 @@  static int setflags(struct file *file, int flags)
 	return err;
 }
 
+static int ubifs_ioc_fsgetxattr(struct file *file, void __user *arg)
+{
+	struct inode *inode = file_inode(file);
+	struct ubifs_inode *ui = ubifs_inode(inode);
+	struct fsxattr fa;
+
+	memset(&fa, 0, sizeof(fa));
+
+	fa.fsx_xflags = ubifs_iflags_to_xflags(ui->flags);
+
+	if (copy_to_user(arg, &fa, sizeof(fa)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int check_xflags(unsigned int flags)
+{
+	if (flags & ~(FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
+static int ubifs_ioc_fssetxattr(struct file *file, const void __user *arg)
+{
+	struct fsxattr fa = {};
+	int err;
+
+	if (copy_from_user(&fa, (struct fsxattr __user *)arg, sizeof(fa)))
+		return -EFAULT;
+
+	err = check_xflags(fa.fsx_xflags);
+	if (err)
+		return err;
+
+	return setflags(file, 0, &fa);
+}
+
 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	int flags, err;
@@ -179,7 +252,7 @@  long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			flags &= ~FS_DIRSYNC_FL;
 
 
-		return setflags(file, flags);
+		return setflags(file, flags, NULL);
 	}
 	case FS_IOC_SET_ENCRYPTION_POLICY: {
 		struct ubifs_info *c = inode->i_sb->s_fs_info;
@@ -193,6 +266,12 @@  long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case FS_IOC_GET_ENCRYPTION_POLICY:
 		return fscrypt_ioctl_get_policy(file, (void __user *)arg);
 
+	case FS_IOC_FSGETXATTR:
+		return ubifs_ioc_fsgetxattr(file, (void __user *)arg);
+
+	case FS_IOC_FSSETXATTR:
+		return ubifs_ioc_fssetxattr(file, (const void __user *)arg);
+
 	default:
 		return -ENOTTY;
 	}