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Message-ID: <496605AF.7020002@gmx.net>
Date: Thu, 08 Jan 2009 14:54:55 +0100
From: Cyrus Massoumi <cyrusm@....net>
To: linux-ext4@...r.kernel.org
CC: tytso@....edu, akpm@...ux-foundation.org, adilger@....com
Subject: [PATCH] ext3: remove the BKL in ext3/ioctl.c
(Please CC me on all replies)
Reformat ext3/ioctl.c to make it look more like ext4/ioctl.c and remove the BKL around ext3_ioctl().
Patch is against 2.6.28. Compile tested only.
Please review and consider applying!
Signed-off-by: Cyrus Massoumi <cyrusm@....net>
---
diff -uNr linux-2.6.28/fs/ext3/dir.c linux-2.6.28-old/fs/ext3/dir.c
--- linux-2.6.28/fs/ext3/dir.c 2008-12-25 00:26:37.000000000 +0100
+++ linux-2.6.28-old/fs/ext3/dir.c 2009-01-07 21:15:41.000000000 +0100
@@ -42,7 +42,7 @@
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext3_readdir, /* we take BKL. needed?*/
- .ioctl = ext3_ioctl, /* BKL held */
+ .unlocked_ioctl = ext3_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext3_compat_ioctl,
#endif
diff -uNr linux-2.6.28/fs/ext3/file.c linux-2.6.28-old/fs/ext3/file.c
--- linux-2.6.28/fs/ext3/file.c 2008-12-25 00:26:37.000000000 +0100
+++ linux-2.6.28-old/fs/ext3/file.c 2009-01-07 21:15:42.000000000 +0100
@@ -112,7 +112,7 @@
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = ext3_file_write,
- .ioctl = ext3_ioctl,
+ .unlocked_ioctl = ext3_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext3_compat_ioctl,
#endif
diff -uNr linux-2.6.28/fs/ext3/ioctl.c linux-2.6.28-old/fs/ext3/ioctl.c
--- linux-2.6.28/fs/ext3/ioctl.c 2008-12-25 00:26:37.000000000 +0100
+++ linux-2.6.28-old/fs/ext3/ioctl.c 2009-01-07 22:01:56.000000000 +0100
@@ -15,12 +15,11 @@
#include <linux/mount.h>
#include <linux/time.h>
#include <linux/compat.h>
-#include <linux/smp_lock.h>
#include <asm/uaccess.h>
-int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
- unsigned long arg)
+long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
+ struct inode *inode = filp->f_dentry->d_inode;
struct ext3_inode_info *ei = EXT3_I(inode);
unsigned int flags;
unsigned short rsv_window_size;
@@ -39,30 +38,25 @@
unsigned int oldflags;
unsigned int jflag;
+ if (!is_owner_or_cap(inode))
+ return -EACCES;
+
+ if (get_user(flags, (int __user *) arg))
+ return -EFAULT;
+
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
- if (!is_owner_or_cap(inode)) {
- err = -EACCES;
- goto flags_out;
- }
-
- if (get_user(flags, (int __user *) arg)) {
- err = -EFAULT;
- goto flags_out;
- }
-
if (!S_ISDIR(inode->i_mode))
flags &= ~EXT3_DIRSYNC_FL;
+ err = -EPERM;
mutex_lock(&inode->i_mutex);
/* Is it quota file? Do not allow user to mess with it */
- if (IS_NOQUOTA(inode)) {
- mutex_unlock(&inode->i_mutex);
- err = -EPERM;
+ if (IS_NOQUOTA(inode))
goto flags_out;
- }
+
oldflags = ei->i_flags;
/* The JOURNAL_DATA flag is modifiable only by root */
@@ -75,11 +69,8 @@
* This test looks nicer. Thanks to Pauline Middelink
*/
if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
- if (!capable(CAP_LINUX_IMMUTABLE)) {
- mutex_unlock(&inode->i_mutex);
- err = -EPERM;
+ if (!capable(CAP_LINUX_IMMUTABLE))
goto flags_out;
- }
}
/*
@@ -87,17 +78,12 @@
* the relevant capability.
*/
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
- if (!capable(CAP_SYS_RESOURCE)) {
- mutex_unlock(&inode->i_mutex);
- err = -EPERM;
+ if (!capable(CAP_SYS_RESOURCE))
goto flags_out;
- }
}
-
handle = ext3_journal_start(inode, 1);
if (IS_ERR(handle)) {
- mutex_unlock(&inode->i_mutex);
err = PTR_ERR(handle);
goto flags_out;
}
@@ -117,15 +103,13 @@
err = ext3_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
ext3_journal_stop(handle);
- if (err) {
- mutex_unlock(&inode->i_mutex);
- return err;
- }
+ if (err)
+ goto flags_out;
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
err = ext3_change_inode_journal_flag(inode, jflag);
- mutex_unlock(&inode->i_mutex);
flags_out:
+ mutex_unlock(&inode->i_mutex);
mnt_drop_write(filp->f_path.mnt);
return err;
}
@@ -141,6 +125,7 @@
if (!is_owner_or_cap(inode))
return -EPERM;
+
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
@@ -148,6 +133,7 @@
err = -EFAULT;
goto setversion_out;
}
+
handle = ext3_journal_start(inode, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
@@ -300,9 +286,6 @@
#ifdef CONFIG_COMPAT
long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct inode *inode = file->f_path.dentry->d_inode;
- int ret;
-
/* These are just misnamed, they actually get/put from/to user an int */
switch (cmd) {
case EXT3_IOC32_GETFLAGS:
@@ -342,9 +325,6 @@
default:
return -ENOIOCTLCMD;
}
- lock_kernel();
- ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
- unlock_kernel();
- return ret;
+ return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif
diff -uNr linux-2.6.28/include/linux/ext3_fs.h linux-2.6.28-old/include/linux/ext3_fs.h
--- linux-2.6.28/include/linux/ext3_fs.h 2008-12-25 00:26:37.000000000 +0100
+++ linux-2.6.28-old/include/linux/ext3_fs.h 2009-01-07 21:15:42.000000000 +0100
@@ -843,9 +843,8 @@
u64 start, u64 len);
/* ioctl.c */
-extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
- unsigned long);
-extern long ext3_compat_ioctl (struct file *, unsigned int, unsigned long);
+extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
+extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
/* namei.c */
extern int ext3_orphan_add(handle_t *, struct inode *);
--
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