[PATCH] Move ncpfs 32bit compat ioctl to ncpfs

The ncp specific compat ioctls are clearly local to one file system, so the
code can better live there.

This version of the patch moves everything into the generic ioctl handler
and uses it for both 32 and 64 bit calls.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 216 insertions, 29 deletions

diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index b4ee892..458b3b7 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -53,6 +53,9 @@ const struct file_operations ncp_dir_operations =
 	.read		= generic_read_dir,
 	.readdir	= ncp_readdir,
 	.ioctl		= ncp_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= ncp_compat_ioctl,
+#endif
 };
 
 struct inode_operations ncp_dir_inode_operations =
diff --git a/fs/ncpfs/file.c b/fs/ncpfs/file.c
index e6b7c67..df37524 100644
--- a/fs/ncpfs/file.c
+++ b/fs/ncpfs/file.c
@@ -289,6 +289,9 @@ const struct file_operations ncp_file_operations =
 	.read		= ncp_file_read,
 	.write		= ncp_file_write,
 	.ioctl		= ncp_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= ncp_compat_ioctl,
+#endif
 	.mmap		= ncp_mmap,
 	.release	= ncp_release,
 	.fsync		= ncp_fsync,
diff --git a/fs/ncpfs/ioctl.c b/fs/ncpfs/ioctl.c
index 42039fe..a89ac84 100644
--- a/fs/ncpfs/ioctl.c
+++ b/fs/ncpfs/ioctl.c
@@ -7,19 +7,21 @@
  *
  */
 
-
-#include <asm/uaccess.h>
 #include <linux/capability.h>
+#include <linux/compat.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/ioctl.h>
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/highuid.h>
+#include <linux/smp_lock.h>
 #include <linux/vmalloc.h>
 
 #include <linux/ncp_fs.h>
 
+#include <asm/uaccess.h>
+
 #include "ncplib_kernel.h"
 
 /* maximum limit for ncp_objectname_ioctl */
@@ -89,6 +91,82 @@ ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
 	return 0;
 }
 
+#ifdef CONFIG_COMPAT
+struct compat_ncp_objectname_ioctl
+{
+	s32		auth_type;
+	u32		object_name_len;
+	compat_caddr_t	object_name;	/* an userspace data, in most cases user name */
+};
+
+struct compat_ncp_fs_info_v2 {
+	s32 version;
+	u32 mounted_uid;
+	u32 connection;
+	u32 buffer_size;
+
+	u32 volume_number;
+	u32 directory_id;
+
+	u32 dummy1;
+	u32 dummy2;
+	u32 dummy3;
+};
+
+struct compat_ncp_ioctl_request {
+	u32 function;
+	u32 size;
+	compat_caddr_t data;
+};
+
+struct compat_ncp_privatedata_ioctl
+{
+	u32		len;
+	compat_caddr_t	data;		/* ~1000 for NDS */
+};
+
+#define NCP_IOC_GET_FS_INFO_V2_32	_IOWR('n', 4, struct compat_ncp_fs_info_v2)
+#define NCP_IOC_NCPREQUEST_32		_IOR('n', 1, struct compat_ncp_ioctl_request)
+#define NCP_IOC_GETOBJECTNAME_32	_IOWR('n', 9, struct compat_ncp_objectname_ioctl)
+#define NCP_IOC_SETOBJECTNAME_32	_IOR('n', 9, struct compat_ncp_objectname_ioctl)
+#define NCP_IOC_GETPRIVATEDATA_32	_IOWR('n', 10, struct compat_ncp_privatedata_ioctl)
+#define NCP_IOC_SETPRIVATEDATA_32	_IOR('n', 10, struct compat_ncp_privatedata_ioctl)
+
+static int
+ncp_get_compat_fs_info_v2(struct ncp_server * server, struct file *file,
+		   struct compat_ncp_fs_info_v2 __user * arg)
+{
+	struct inode *inode = file->f_dentry->d_inode;
+	struct compat_ncp_fs_info_v2 info2;
+
+	if ((file_permission(file, MAY_WRITE) != 0)
+	    && (current->uid != server->m.mounted_uid)) {
+		return -EACCES;
+	}
+	if (copy_from_user(&info2, arg, sizeof(info2)))
+		return -EFAULT;
+
+	if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
+		DPRINTK("info.version invalid: %d\n", info2.version);
+		return -EINVAL;
+	}
+	info2.mounted_uid   = server->m.mounted_uid;
+	info2.connection    = server->connection;
+	info2.buffer_size   = server->buffer_size;
+	info2.volume_number = NCP_FINFO(inode)->volNumber;
+	info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
+	info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
+
+	if (copy_to_user(arg, &info2, sizeof(info2)))
+		return -EFAULT;
+	return 0;
+}
+#endif
+
+#define NCP_IOC_GETMOUNTUID16		_IOW('n', 2, u16)
+#define NCP_IOC_GETMOUNTUID32		_IOW('n', 2, u32)
+#define NCP_IOC_GETMOUNTUID64		_IOW('n', 2, u64)
+
 #ifdef CONFIG_NCPFS_NLS
 /* Here we are select the iocharset and the codepage for NLS.
  * Thanks Petr Vandrovec for idea and many hints.
@@ -192,12 +270,24 @@ int ncp_ioctl(struct inode *inode, struct file *filp,
 	void __user *argp = (void __user *)arg;
 
 	switch (cmd) {
+#ifdef CONFIG_COMPAT
+	case NCP_IOC_NCPREQUEST_32:
+#endif
 	case NCP_IOC_NCPREQUEST:
-
 		if ((file_permission(filp, MAY_WRITE) != 0)
 		    && (current->uid != server->m.mounted_uid)) {
 			return -EACCES;
 		}
+#ifdef CONFIG_COMPAT
+		if (cmd == NCP_IOC_NCPREQUEST_32) {
+			struct compat_ncp_ioctl_request request32;
+			if (copy_from_user(&request32, argp, sizeof(request32)))
+				return -EFAULT;
+			request.function = request32.function;
+			request.size = request32.size;
+			request.data = compat_ptr(request32.data);
+		} else
+#endif
 		if (copy_from_user(&request, argp, sizeof(request)))
 			return -EFAULT;
 
@@ -254,19 +344,35 @@ int ncp_ioctl(struct inode *inode, struct file *filp,
 	case NCP_IOC_GET_FS_INFO_V2:
 		return ncp_get_fs_info_v2(server, filp, argp);
 
-	case NCP_IOC_GETMOUNTUID2:
-		{
-			unsigned long tmp = server->m.mounted_uid;
-
-			if ((file_permission(filp, MAY_READ) != 0)
-			    && (current->uid != server->m.mounted_uid))
-			{
-				return -EACCES;
-			}
-			if (put_user(tmp, (unsigned long __user *)argp)) 
+#ifdef CONFIG_COMPAT
+	case NCP_IOC_GET_FS_INFO_V2_32:
+		return ncp_get_compat_fs_info_v2(server, filp, argp);
+#endif
+	/* we have too many combinations of CONFIG_COMPAT,
+	 * CONFIG_64BIT and CONFIG_UID16, so just handle
+	 * any of the possible ioctls */
+	case NCP_IOC_GETMOUNTUID16:
+	case NCP_IOC_GETMOUNTUID32:
+	case NCP_IOC_GETMOUNTUID64:
+		if ((file_permission(filp, MAY_READ) != 0)
+			&& (current->uid != server->m.mounted_uid)) {
+			return -EACCES;
+		}
+		if (cmd == NCP_IOC_GETMOUNTUID16) {
+			u16 uid;
+			SET_UID(uid, server->m.mounted_uid);
+			if (put_user(uid, (u16 __user *)argp))
+				return -EFAULT;
+		} else if (cmd == NCP_IOC_GETMOUNTUID32) {
+			if (put_user(server->m.mounted_uid,
+						(u32 __user *)argp))
+				return -EFAULT;
+		} else {
+			if (put_user(server->m.mounted_uid,
+						(u64 __user *)argp))
 				return -EFAULT;
-			return 0;
 		}
+		return 0;
 
 	case NCP_IOC_GETROOT:
 		{
@@ -476,6 +582,32 @@ outrel:
 		}
 #endif	/* CONFIG_NCPFS_IOCTL_LOCKING */
 
+#ifdef CONFIG_COMPAT
+	case NCP_IOC_GETOBJECTNAME_32:
+		if (current->uid != server->m.mounted_uid) {
+			return -EACCES;
+		}
+		{
+			struct compat_ncp_objectname_ioctl user;
+			size_t outl;
+
+			if (copy_from_user(&user, argp, sizeof(user)))
+				return -EFAULT;
+			user.auth_type = server->auth.auth_type;
+			outl = user.object_name_len;
+			user.object_name_len = server->auth.object_name_len;
+			if (outl > user.object_name_len)
+				outl = user.object_name_len;
+			if (outl) {
+				if (copy_to_user(compat_ptr(user.object_name),
+						 server->auth.object_name,
+						 outl)) return -EFAULT;
+			}
+			if (copy_to_user(argp, &user, sizeof(user)))
+				return -EFAULT;
+			return 0;
+		}
+#endif
 	case NCP_IOC_GETOBJECTNAME:
 		if (current->uid != server->m.mounted_uid) {
 			return -EACCES;
@@ -500,6 +632,9 @@ outrel:
 				return -EFAULT;
 			return 0;
 		}
+#ifdef CONFIG_COMPAT
+	case NCP_IOC_SETOBJECTNAME_32:
+#endif
 	case NCP_IOC_SETOBJECTNAME:
 		if (current->uid != server->m.mounted_uid) {
 			return -EACCES;
@@ -512,8 +647,19 @@ outrel:
 			void* oldprivate;
 			size_t oldprivatelen;
 
+#ifdef CONFIG_COMPAT
+			if (cmd == NCP_IOC_SETOBJECTNAME_32) {
+				struct compat_ncp_objectname_ioctl user32;
+				if (copy_from_user(&user32, argp, sizeof(user32)))
+					return -EFAULT;
+				user.auth_type = user32.auth_type;
+				user.object_name_len = user32.object_name_len;
+				user.object_name = compat_ptr(user32.object_name);
+			} else
+#endif
 			if (copy_from_user(&user, argp, sizeof(user)))
 				return -EFAULT;
+
 			if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 				return -ENOMEM;
 			if (user.object_name_len) {
@@ -544,6 +690,9 @@ outrel:
 			kfree(oldname);
 			return 0;
 		}
+#ifdef CONFIG_COMPAT
+	case NCP_IOC_GETPRIVATEDATA_32:
+#endif
 	case NCP_IOC_GETPRIVATEDATA:
 		if (current->uid != server->m.mounted_uid) {
 			return -EACCES;
@@ -552,8 +701,18 @@ outrel:
 			struct ncp_privatedata_ioctl user;
 			size_t outl;
 
+#ifdef CONFIG_COMPAT
+			if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
+				struct compat_ncp_privatedata_ioctl user32;
+				if (copy_from_user(&user32, argp, sizeof(user32)))
+					return -EFAULT;
+				user.len = user32.len;
+				user.data = compat_ptr(user32.data);
+			} else
+#endif
 			if (copy_from_user(&user, argp, sizeof(user)))
 				return -EFAULT;
+
 			outl = user.len;
 			user.len = server->priv.len;
 			if (outl > user.len) outl = user.len;
@@ -562,10 +721,23 @@ outrel:
 						 server->priv.data,
 						 outl)) return -EFAULT;
 			}
+#ifdef CONFIG_COMPAT
+			if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
+				struct compat_ncp_privatedata_ioctl user32;
+				user32.len = user.len;
+				user32.data = (unsigned long) user.data;
+				if (copy_to_user(&user32, argp, sizeof(user32)))
+					return -EFAULT;
+			} else
+#endif
 			if (copy_to_user(argp, &user, sizeof(user)))
 				return -EFAULT;
+
 			return 0;
 		}
+#ifdef CONFIG_COMPAT
+	case NCP_IOC_SETPRIVATEDATA_32:
+#endif
 	case NCP_IOC_SETPRIVATEDATA:
 		if (current->uid != server->m.mounted_uid) {
 			return -EACCES;
@@ -576,8 +748,18 @@ outrel:
 			void* old;
 			size_t oldlen;
 
+#ifdef CONFIG_COMPAT
+			if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
+				struct compat_ncp_privatedata_ioctl user32;
+				if (copy_from_user(&user32, argp, sizeof(user32)))
+					return -EFAULT;
+				user.len = user32.len;
+				user.data = compat_ptr(user32.data);
+			} else
+#endif
 			if (copy_from_user(&user, argp, sizeof(user)))
 				return -EFAULT;
+
 			if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 				return -ENOMEM;
 			if (user.len) {
@@ -636,20 +818,19 @@ outrel:
 		}
 
 	}
-/* #ifdef CONFIG_UID16 */
-	/* NCP_IOC_GETMOUNTUID may be same as NCP_IOC_GETMOUNTUID2,
-           so we have this out of switch */
-	if (cmd == NCP_IOC_GETMOUNTUID) {
-		__kernel_uid_t uid = 0;
-		if ((file_permission(filp, MAY_READ) != 0)
-		    && (current->uid != server->m.mounted_uid)) {
-			return -EACCES;
-		}
-		SET_UID(uid, server->m.mounted_uid);
-		if (put_user(uid, (__kernel_uid_t __user *)argp))
-			return -EFAULT;
-		return 0;
-	}
-/* #endif */
 	return -EINVAL;
 }
+
+#ifdef CONFIG_COMPAT
+long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct inode *inode = file->f_dentry->d_inode;
+	int ret;
+
+	lock_kernel();
+	arg = (unsigned long) compat_ptr(arg);
+	ret = ncp_ioctl(inode, file, cmd, arg);
+	unlock_kernel();
+	return ret;
+}
+#endif