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Subject[PATCH] Convert ext3_ioctl() to an unlocked_ioctl
Date
Signed-off-by: Mathieu Segaud <mathieu.segaud@regala.cx>
---
fs/ext3/dir.c | 2 +-
fs/ext3/file.c | 2 +-
fs/ext3/ioctl.c | 159 ++++++++++++++++++++++++++++++++--------------
include/linux/ext3_fs.h | 3 +-
4 files changed, 113 insertions(+), 53 deletions(-)
diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c
index 8ca3bfd..5ab6b88 100644
--- a/fs/ext3/dir.c
+++ b/fs/ext3/dir.c
@@ -42,7 +42,7 @@ const struct file_operations ext3_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext3_readdir, /* we take BKL. needed?*/
- .ioctl = ext3_ioctl, /* BKL held */
+ .unlocked_ioctl = ext3_ioctl, /* BKL held */
#ifdef CONFIG_COMPAT
.compat_ioctl = ext3_compat_ioctl,
#endif
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index acc4913..49798ed 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -112,7 +112,7 @@ const struct file_operations ext3_file_operations = {
.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 --git a/fs/ext3/ioctl.c b/fs/ext3/ioctl.c
index 023a070..9d57d47 100644
--- a/fs/ext3/ioctl.c
+++ b/fs/ext3/ioctl.c
@@ -17,12 +17,19 @@
#include <linux/smp_lock.h>
#include <asm/uaccess.h>

-int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
+long ext3_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
- struct ext3_inode_info *ei = EXT3_I(inode);
+ struct ext3_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 = EXT3_I(inode);

ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);

@@ -30,7 +37,8 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
case EXT3_IOC_GETFLAGS:
ext3_get_inode_flags(ei);
flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
- return put_user(flags, (int __user *) arg);
+ retval = put_user(flags, (int __user *) arg);
+ goto out;
case EXT3_IOC_SETFLAGS: {
handle_t *handle = NULL;
int err;
@@ -38,14 +46,20 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
unsigned int oldflags;
unsigned int jflag;

- 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 &= ~EXT3_DIRSYNC_FL;
@@ -54,7 +68,8 @@ int ext3_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;

@@ -70,7 +85,8 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ retval = -EPERM;
+ goto out;
}
}

@@ -81,7 +97,8 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
if (!capable(CAP_SYS_RESOURCE)) {
mutex_unlock(&inode->i_mutex);
- return -EPERM;
+ retval = -EPERM;
+ goto out;
}
}

@@ -89,7 +106,8 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
handle = ext3_journal_start(inode, 1);
if (IS_ERR(handle)) {
mutex_unlock(&inode->i_mutex);
- return PTR_ERR(handle);
+ retval = PTR_ERR(handle);
+ goto out;
}
if (IS_SYNC(inode))
handle->h_sync = 1;
@@ -109,17 +127,20 @@ flags_err:
ext3_journal_stop(handle);
if (err) {
mutex_unlock(&inode->i_mutex);
- return err;
+ retval = err;
+ goto out;
}

if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
err = ext3_change_inode_journal_flag(inode, jflag);
mutex_unlock(&inode->i_mutex);
- return err;
+ retval = err;
+ goto out;
}
case EXT3_IOC_GETVERSION:
case EXT3_IOC_GETVERSION_OLD:
- return put_user(inode->i_generation, (int __user *) arg);
+ retval = put_user(inode->i_generation, (int __user *) arg);
+ goto out;
case EXT3_IOC_SETVERSION:
case EXT3_IOC_SETVERSION_OLD: {
handle_t *handle;
@@ -127,16 +148,24 @@ flags_err:
__u32 generation;
int err;

- if (!is_owner_or_cap(inode))
- return -EPERM;
- if (IS_RDONLY(inode))
- return -EROFS;
- if (get_user(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(generation, (int __user *) arg)) {
+ retval = -EFAULT;
+ goto out;
+ }

handle = ext3_journal_start(inode, 1);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
+ if (IS_ERR(handle)) {
+ retval = PTR_ERR(handle);
+ goto out;
+ }
err = ext3_reserve_inode_write(handle, inode, &iloc);
if (err == 0) {
inode->i_ctime = CURRENT_TIME_SEC;
@@ -144,7 +173,8 @@ flags_err:
err = ext3_mark_iloc_dirty(handle, inode, &iloc);
}
ext3_journal_stop(handle);
- return err;
+ retval = err;
+ goto out;
}
#ifdef CONFIG_JBD_DEBUG
case EXT3_IOC_WAIT_FOR_READONLY:
@@ -158,7 +188,7 @@ flags_err:
{
struct super_block *sb = inode->i_sb;
DECLARE_WAITQUEUE(wait, current);
- int ret = 0;
+ long ret = 0;

set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
@@ -167,6 +197,7 @@ flags_err:
ret = 1;
}
remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
+ unlock_kernel();
return ret;
}
#endif
@@ -175,22 +206,33 @@ flags_err:
&& 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 EXT3_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 (!is_owner_or_cap(inode))
- return -EACCES;
+ if (!is_owner_or_cap(inode)) {
+ 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 > EXT3_MAX_RESERVE_BLOCKS)
rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
@@ -208,27 +250,34 @@ flags_err:
rsv->rsv_goal_size = rsv_window_size;
}
mutex_unlock(&ei->truncate_mutex);
- return 0;
+ goto out;
}
case EXT3_IOC_GROUP_EXTEND: {
ext3_fsblk_t n_blocks_count;
struct super_block *sb = inode->i_sb;
int err;

- if (!capable(CAP_SYS_RESOURCE))
- return -EPERM;
+ if (!capable(CAP_SYS_RESOURCE)) {
+ retval = -EPERM;
+ goto out;
+ }

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

- if (get_user(n_blocks_count, (__u32 __user *)arg))
- return -EFAULT;
+ if (get_user(n_blocks_count, (__u32 __user *)arg)) {
+ retval = -EFAULT;
+ goto out;
+ }

err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
journal_lock_updates(EXT3_SB(sb)->s_journal);
journal_flush(EXT3_SB(sb)->s_journal);
journal_unlock_updates(EXT3_SB(sb)->s_journal);

+ unlock_kernel();
return err;
}
case EXT3_IOC_GROUP_ADD: {
@@ -236,28 +285,40 @@ flags_err:
struct super_block *sb = inode->i_sb;
int err;

- if (!capable(CAP_SYS_RESOURCE))
- return -EPERM;
+ if (!capable(CAP_SYS_RESOURCE)) {
+ retval = -EPERM;
+ goto out;
+ }

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

if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
- sizeof(input)))
- return -EFAULT;
+ sizeof(input))) {
+ retval = -EFAULT;
+ goto out;
+ }

err = ext3_group_add(sb, &input);
journal_lock_updates(EXT3_SB(sb)->s_journal);
journal_flush(EXT3_SB(sb)->s_journal);
journal_unlock_updates(EXT3_SB(sb)->s_journal);

+ unlock_kernel();
return err;
}


default:
+ unlock_kernel();
return -ENOTTY;
}
+
+out:
+ unlock_kernel();
+ return retval;
}

#ifdef CONFIG_COMPAT
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 241c01c..1c925eb 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -838,8 +838,7 @@ extern void ext3_get_inode_flags(struct ext3_inode_info *);
extern void ext3_set_aops(struct inode *inode);

/* ioctl.c */
-extern int ext3_ioctl (struct inode *, 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 */
--
1.5.3.8


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