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Date: Mon, 16 Nov 2009 00:27:01 +0000
From: Arnd Bergmann <arnd@...db.de>
To: linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Nick Piggin <npiggin@...e.de>
Subject: [PATCH 06/12] smbfs: do compat_ioctl handling in place
Handling SMB_IOC_GETMOUNTUID emulation directly in smbfs avoids
extra code in fs/compat_ioctl.c and can be optimized away by
the compiler in architectures where SMB_IOC_GETMOUNTUID and
COMPAT_SMB_IOC_GETMOUNTUID are identical.
As a positive side-effect, this pushes the BKL into the
ioctl method.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nick Piggin <npiggin@...e.de>
---
fs/compat_ioctl.c | 25 -------------------------
fs/smbfs/dir.c | 5 ++++-
fs/smbfs/file.c | 3 ++-
fs/smbfs/ioctl.c | 48 ++++++++++++++++++++++++++++++++++++++++++++----
fs/smbfs/proto.h | 3 ++-
5 files changed, 52 insertions(+), 32 deletions(-)
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 376d907..a762fb1 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -520,25 +520,6 @@ static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, void __user *argp)
#endif /* CONFIG_BLOCK */
-static int do_smb_getmountuid(unsigned int fd, unsigned int cmd,
- compat_uid_t __user *argp)
-{
- mm_segment_t old_fs = get_fs();
- __kernel_uid_t kuid;
- int err;
-
- cmd = SMB_IOC_GETMOUNTUID;
-
- set_fs(KERNEL_DS);
- err = sys_ioctl(fd, cmd, (unsigned long)&kuid);
- set_fs(old_fs);
-
- if (err >= 0)
- err = put_user(kuid, argp);
-
- return err;
-}
-
/* Bluetooth ioctls */
#define HCIUARTSETPROTO _IOW('U', 200, int)
#define HCIUARTGETPROTO _IOR('U', 201, int)
@@ -1264,8 +1245,6 @@ COMPATIBLE_IOCTL(OSS_GETVERSION)
/* Raw devices */
COMPATIBLE_IOCTL(RAW_SETBIND)
COMPATIBLE_IOCTL(RAW_GETBIND)
-/* SMB ioctls which do not need any translations */
-COMPATIBLE_IOCTL(SMB_IOC_NEWCONN)
/* Watchdog */
COMPATIBLE_IOCTL(WDIOC_GETSUPPORT)
COMPATIBLE_IOCTL(WDIOC_GETSTATUS)
@@ -1543,10 +1522,6 @@ static long do_ioctl_trans(int fd, unsigned int cmd,
case MTIOCPOS32:
return mt_ioctl_trans(fd, cmd, argp);
#endif
- /* One SMB ioctl needs translations. */
-#define SMB_IOC_GETMOUNTUID_32 _IOR('u', 1, compat_uid_t)
- case SMB_IOC_GETMOUNTUID_32:
- return do_smb_getmountuid(fd, cmd, argp);
/* Serial */
case TIOCGSERIAL:
case TIOCSSERIAL:
diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c
index 3e4803b..9607ff1 100644
--- a/fs/smbfs/dir.c
+++ b/fs/smbfs/dir.c
@@ -39,7 +39,10 @@ const struct file_operations smb_dir_operations =
{
.read = generic_read_dir,
.readdir = smb_readdir,
- .ioctl = smb_ioctl,
+ .unlocked_ioctl = smb_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = smb_ioctl,
+#endif
.open = smb_dir_open,
};
diff --git a/fs/smbfs/file.c b/fs/smbfs/file.c
index 92d5e8f..02f2bf8 100644
--- a/fs/smbfs/file.c
+++ b/fs/smbfs/file.c
@@ -438,7 +438,8 @@ const struct file_operations smb_file_operations =
.aio_read = smb_file_aio_read,
.write = do_sync_write,
.aio_write = smb_file_aio_write,
- .ioctl = smb_ioctl,
+ .unlocked_ioctl = smb_ioctl,
+ .compat_ioctl = smb_ioctl,
.mmap = smb_file_mmap,
.open = smb_file_open,
.release = smb_file_release,
diff --git a/fs/smbfs/ioctl.c b/fs/smbfs/ioctl.c
index dbae1f8..0c28305 100644
--- a/fs/smbfs/ioctl.c
+++ b/fs/smbfs/ioctl.c
@@ -14,6 +14,8 @@
#include <linux/mm.h>
#include <linux/highuid.h>
#include <linux/net.h>
+#include <linux/smp_lock.h>
+#include <linux/compat.h>
#include <linux/smb_fs.h>
#include <linux/smb_mount.h>
@@ -22,11 +24,9 @@
#include "proto.h"
-int
-smb_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
+static long
+smb_locked_ioctl(struct smb_sb_info *server, unsigned int cmd, void __user *arg)
{
- struct smb_sb_info *server = server_from_inode(inode);
struct smb_conn_opt opt;
int result = -EINVAL;
@@ -65,3 +65,43 @@ smb_ioctl(struct inode *inode, struct file *filp,
return result;
}
+
+long
+smb_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct smb_sb_info *server;
+ int ret;
+
+ lock_kernel();
+ server = server_from_inode(filp->f_path.dentry->d_inode);
+ ret = smb_locked_ioctl(server, cmd, (void __user *)arg);
+ unlock_kernel();
+
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+#define COMPAT_SMB_IOC_GETMOUNTUID _IOR('u', 1, compat_uid_t)
+long
+smb_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct smb_sb_info *server;
+ void __user *argp = compat_ptr(arg);
+ int ret;
+
+ lock_kernel();
+ server = server_from_inode(filp->f_path.dentry->d_inode);
+ if (cmd == COMPAT_SMB_IOC_GETMOUNTUID &&
+ sizeof (compat_uid_t) < sizeof (__kernel_old_uid_t)) {
+ uid_t uid = server->mnt->mounted_uid;
+ if (uid > 65535)
+ uid = (compat_uid_t)overflowuid;
+ ret = put_user(uid, (compat_uid_t __user *) argp);
+ } else {
+ ret = smb_locked_ioctl(server, cmd, argp);
+ }
+ unlock_kernel();
+
+ return ret;
+}
+#endif
diff --git a/fs/smbfs/proto.h b/fs/smbfs/proto.h
index 03f456c..34bc708 100644
--- a/fs/smbfs/proto.h
+++ b/fs/smbfs/proto.h
@@ -67,7 +67,8 @@ extern const struct address_space_operations smb_file_aops;
extern const struct file_operations smb_file_operations;
extern const struct inode_operations smb_file_inode_operations;
/* ioctl.c */
-extern int smb_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
+extern long smb_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+extern long smb_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
/* smbiod.c */
extern void smbiod_wake_up(void);
extern int smbiod_register_server(struct smb_sb_info *server);
--
1.6.3.3
--
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