[PATCH 3/4] fs: teach vfs_ioc_fssetxattr_check to check project id info

[Darrick J. Wong]

From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Standardize the project id checks for FSSETXATTR.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
---
 fs/ext4/ioctl.c    |   27 ---------------------------
 fs/f2fs/file.c     |   27 ---------------------------
 fs/inode.c         |   13 +++++++++++++
 fs/xfs/xfs_ioctl.c |   15 ---------------
 4 files changed, 13 insertions(+), 69 deletions(-)


diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index c2f48c90ca45..6aa1df1918f7 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -697,30 +697,6 @@ static long ext4_ioctl_group_add(struct file *file,
 	return err;
 }
 
-static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
-{
-	/*
-	 * Project Quota ID state is only allowed to change from within the init
-	 * namespace. Enforce that restriction only if we are trying to change
-	 * the quota ID state. Everything else is allowed in user namespaces.
-	 */
-	if (current_user_ns() == &init_user_ns)
-		return 0;
-
-	if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
-		return -EINVAL;
-
-	if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
-		if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
-			return -EINVAL;
-	} else {
-		if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
 static void ext4_fsgetxattr(struct inode *inode, struct fsxattr *fa)
 {
 	struct ext4_inode_info *ei = EXT4_I(inode);
@@ -1135,9 +1111,6 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 
 		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;
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f707de6bd4a8..183ed1ac60e1 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2799,30 +2799,6 @@ static int f2fs_ioc_fsgetxattr(struct file *filp, unsigned long arg)
 	return 0;
 }
 
-static int f2fs_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
-{
-	/*
-	 * Project Quota ID state is only allowed to change from within the init
-	 * namespace. Enforce that restriction only if we are trying to change
-	 * the quota ID state. Everything else is allowed in user namespaces.
-	 */
-	if (current_user_ns() == &init_user_ns)
-		return 0;
-
-	if (__kprojid_val(F2FS_I(inode)->i_projid) != fa->fsx_projid)
-		return -EINVAL;
-
-	if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL) {
-		if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
-			return -EINVAL;
-	} else {
-		if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
 static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
@@ -2850,9 +2826,6 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
 		return err;
 
 	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);
diff --git a/fs/inode.c b/fs/inode.c
index ddfe60679b53..f1ffa9605078 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2221,6 +2221,19 @@ int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
 	    !capable(CAP_LINUX_IMMUTABLE))
 		return -EPERM;
 
+	/*
+	 * Project Quota ID state is only allowed to change from within the init
+	 * namespace. Enforce that restriction only if we are trying to change
+	 * the quota ID state. Everything else is allowed in user namespaces.
+	 */
+	if (current_user_ns() != &init_user_ns) {
+		if (old_fa->fsx_projid != fa->fsx_projid)
+			return -EINVAL;
+		if ((old_fa->fsx_xflags ^ fa->fsx_xflags) &
+				FS_XFLAG_PROJINHERIT)
+			return -EINVAL;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL(vfs_ioc_fssetxattr_check);
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 08c24f2f55c3..82961de98900 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1299,21 +1299,6 @@ xfs_ioctl_setattr_check_projid(
 	if (fa->fsx_projid > (uint16_t)-1 &&
 	    !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
 		return -EINVAL;
-
-	/*
-	 * Project Quota ID state is only allowed to change from within the init
-	 * namespace. Enforce that restriction only if we are trying to change
-	 * the quota ID state. Everything else is allowed in user namespaces.
-	 */
-	if (current_user_ns() == &init_user_ns)
-		return 0;
-
-	if (xfs_get_projid(ip) != fa->fsx_projid)
-		return -EINVAL;
-	if ((fa->fsx_xflags & FS_XFLAG_PROJINHERIT) !=
-	    (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
-		return -EINVAL;
-
 	return 0;
 }