linux-kernel - [PATCH 3.16 030/305] btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION} in btrfs

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Message-ID: <lsq.1471110171.601620181@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Josef Bacik" <jbacik@...com>,
	"Luke Dashjr" <luke@...hjr.org>,
	"Luke Dashjr" <luke-jr+git@...pios.org>,
	"David Sterba" <dsterba@...e.com>
Subject: [PATCH 3.16 030/305] btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION}
 in btrfs_ioctl

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Luke Dashjr <luke@...hjr.org>

commit 4c63c2454eff996c5e27991221106eb511f7db38 upstream.

32-bit ioctl uses these rather than the regular FS_IOC_* versions. They can
be handled in btrfs using the same code. Without this, 32-bit {ch,ls}attr
fail.

Signed-off-by: Luke Dashjr <luke-jr+git@...pios.org>
Reviewed-by: Josef Bacik <jbacik@...com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/btrfs/ctree.h |  1 +
 fs/btrfs/file.c  |  2 +-
 fs/btrfs/inode.c |  2 +-
 fs/btrfs/ioctl.c | 21 +++++++++++++++++++++
 4 files changed, 24 insertions(+), 2 deletions(-)

--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3876,6 +3876,7 @@ extern const struct dentry_operations bt
 
 /* ioctl.c */
 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 void btrfs_update_iflags(struct inode *inode);
 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
 int btrfs_is_empty_uuid(u8 *uuid);
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2739,7 +2739,7 @@ const struct file_operations btrfs_file_
 	.fallocate	= btrfs_fallocate,
 	.unlocked_ioctl	= btrfs_ioctl,
 #ifdef CONFIG_COMPAT
-	.compat_ioctl	= btrfs_ioctl,
+	.compat_ioctl	= btrfs_compat_ioctl,
 #endif
 };
 
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9102,7 +9102,7 @@ static const struct file_operations btrf
 	.iterate	= btrfs_real_readdir,
 	.unlocked_ioctl	= btrfs_ioctl,
 #ifdef CONFIG_COMPAT
-	.compat_ioctl	= btrfs_ioctl,
+	.compat_ioctl	= btrfs_compat_ioctl,
 #endif
 	.release        = btrfs_release_file,
 	.fsync		= btrfs_sync_file,
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5520,3 +5520,24 @@ long btrfs_ioctl(struct file *file, unsi
 
 	return -ENOTTY;
 }
+
+#ifdef CONFIG_COMPAT
+long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case FS_IOC32_GETFLAGS:
+		cmd = FS_IOC_GETFLAGS;
+		break;
+	case FS_IOC32_SETFLAGS:
+		cmd = FS_IOC_SETFLAGS;
+		break;
+	case FS_IOC32_GETVERSION:
+		cmd = FS_IOC_GETVERSION;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif