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Subject[PATCH] Convert EXT2 to use unlocked_ioctl
Date
Change ext_ioctl() to be an unlocked_ioctl(), explicitly
exposing BKL's uses.

Signed-off-by: Mathieu Segaud <mathieu.segaud@regala.cx>
---
fs/ext2/dir.c | 2 +-
fs/ext2/ext2.h | 3 +-
fs/ext2/file.c | 4 +-
fs/ext2/ioctl.c | 101 +++++++++++++++++++++++++++++++++++++-----------------
4 files changed, 73 insertions(+), 37 deletions(-)
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index d868e26..dbee3c9 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -703,7 +703,7 @@ const struct file_operations ext2_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext2_readdir,
- .ioctl = ext2_ioctl,
+ .unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,
#endif
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index c87ae29..bb9948c 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -139,8 +139,7 @@ int __ext2_write_begin(struct file *file, struct address_space *mapping,
struct page **pagep, void **fsdata);

/* ioctl.c */
-extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
- unsigned long);
+extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);

/* namei.c */
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index c051798..17fe628 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -48,7 +48,7 @@ const struct file_operations ext2_file_operations = {
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
- .ioctl = ext2_ioctl,
+ .unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,
#endif
@@ -65,7 +65,7 @@ const struct file_operations ext2_xip_file_operations = {
.llseek = generic_file_llseek,
.read = xip_file_read,
.write = xip_file_write,
- .ioctl = ext2_ioctl,
+ .unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,
#endif
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 320b2cb..02ba8e4 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -17,12 +17,18 @@
#include <asm/uaccess.h>


-int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
+long ext2_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
- struct ext2_inode_info *ei = EXT2_I(inode);
+ struct ext2_inode_info *ei;
+ struct inode *inode;
unsigned int flags;
unsigned short rsv_window_size;
+ long retval = 0;
+
+ lock_kernel();
+ inode = filp->f_dentry->d_inode;
+ ei = EXT2_I(inode);

ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);

@@ -30,18 +36,25 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
case EXT2_IOC_GETFLAGS:
ext2_get_inode_flags(ei);
flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
- return put_user(flags, (int __user *) arg);
+ retval = put_user(flags, (int __user *) arg);
+ goto out;
case EXT2_IOC_SETFLAGS: {
unsigned int oldflags;

- if (IS_RDONLY(inode))
- return -EROFS;
+ if (IS_RDONLY(inode)) {
+ retval = -EROFS;
+ goto out;
+ }

- if (!is_owner_or_cap(inode))
- return -EACCES;
+ if (!is_owner_or_cap(inode)) {
+ retval = -EACCES;
+ goto out;
+ }

- if (get_user(flags, (int __user *) arg))
- return -EFAULT;
+ if (get_user(flags, (int __user *) arg)) {
+ retval = -EFAULT;
+ goto out;
+ }

if (!S_ISDIR(inode->i_mode))
flags &= ~EXT2_DIRSYNC_FL;
@@ -50,7 +63,8 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
/* Is it quota file? Do not allow user to mess with it */
if (IS_NOQUOTA(inode)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ retval = -EPERM;
+ goto out;
}
oldflags = ei->i_flags;

@@ -63,7 +77,8 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ retval = -EPERM;
+ goto out;
}
}

@@ -75,41 +90,59 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
ext2_set_inode_flags(inode);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+ goto out;
}
case EXT2_IOC_GETVERSION:
- return put_user(inode->i_generation, (int __user *) arg);
+ retval = put_user(inode->i_generation, (int __user *) arg);
+ goto out;
case EXT2_IOC_SETVERSION:
- if (!is_owner_or_cap(inode))
- return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(inode->i_generation, (int __user *) arg))
- return -EFAULT;
+ if (!is_owner_or_cap(inode)) {
+ retval = -EPERM;
+ goto out;
+ }
+ if (IS_RDONLY(inode)) {
+ retval = -EROFS;
+ goto out;
+ }
+ if (get_user(inode->i_generation, (int __user *) arg)) {
+ retval = -EFAULT;
+ goto out;
+ }
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- return 0;
+ goto out;
case EXT2_IOC_GETRSVSZ:
if (test_opt(inode->i_sb, RESERVATION)
&& S_ISREG(inode->i_mode)
&& ei->i_block_alloc_info) {
rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
- return put_user(rsv_window_size, (int __user *)arg);
+ retval = put_user(rsv_window_size, (int __user *)arg);
+ goto out;
}
- return -ENOTTY;
+ retval = -ENOTTY;
+ goto out;
case EXT2_IOC_SETRSVSZ: {

- if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
- return -ENOTTY;
+ if (!test_opt(inode->i_sb, RESERVATION) ||
+ !S_ISREG(inode->i_mode)) {
+ retval = -ENOTTY;
+ goto out;
+ }

- if (IS_RDONLY(inode))
- return -EROFS;
+ if (IS_RDONLY(inode)) {
+ retval = -EROFS;
+ goto out;
+ }

- if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
- return -EACCES;
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) {
+ retval = -EACCES;
+ goto out;
+ }

- if (get_user(rsv_window_size, (int __user *)arg))
- return -EFAULT;
+ if (get_user(rsv_window_size, (int __user *)arg)) {
+ retval = -EFAULT;
+ goto out;
+ }

if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
@@ -131,11 +164,15 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
rsv->rsv_goal_size = rsv_window_size;
}
mutex_unlock(&ei->truncate_mutex);
- return 0;
+ goto out;
}
default:
- return -ENOTTY;
+ retval = -ENOTTY;
+ goto out;
}
+out:
+ unlock_kernel();
+ return retval;
}

#ifdef CONFIG_COMPAT
--
1.5.3.8


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