I checked ext4_ioctl and it looked largely safe to not be used
without BKL. So convert it over to unlocked_ioctl.
The only case where I wasn't quite sure was for the
dynamic fs grow ioctls versus umounting -- I kept the BKL for those.
Cc: sct@xxxxxxxxxx
Cc: adilger@xxxxxxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxx>
---
fs/ext4/dir.c | 2 +-
fs/ext4/file.c | 2 +-
fs/ext4/ioctl.c | 20 +++++++++++---------
include/linux/ext4_fs.h | 3 +--
4 files changed, 14 insertions(+), 13 deletions(-)
Index: linux/fs/ext4/dir.c
===================================================================
--- linux.orig/fs/ext4/dir.c
+++ linux/fs/ext4/dir.c
@@ -42,7 +42,7 @@ const struct file_operations ext4_dir_op
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext4_readdir, /* we take BKL. needed?*/
- .ioctl = ext4_ioctl, /* BKL held */
+ .unlocked_ioctl = ext4_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext4_compat_ioctl,
#endif
Index: linux/fs/ext4/file.c
===================================================================
--- linux.orig/fs/ext4/file.c
+++ linux/fs/ext4/file.c
@@ -112,7 +112,7 @@ const struct file_operations ext4_file_o
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = ext4_file_write,
- .ioctl = ext4_ioctl,
+ .unlocked_ioctl = ext4_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext4_compat_ioctl,
#endif
Index: linux/fs/ext4/ioctl.c
===================================================================
--- linux.orig/fs/ext4/ioctl.c
+++ linux/fs/ext4/ioctl.c
@@ -17,9 +17,9 @@
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
-int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
- unsigned long arg)
+long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
+ struct inode *inode = filp->f_dentry->d_inode;
struct ext4_inode_info *ei = EXT4_I(inode);
unsigned int flags;
unsigned short rsv_window_size;
@@ -224,10 +224,14 @@ flags_err:
if (get_user(n_blocks_count, (__u32 __user *)arg))
return -EFAULT;
+ /* AK: not sure the BKL is needed, but this might prevent
+ * races against umount. */
+ lock_kernel();
err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
jbd2_journal_flush(EXT4_SB(sb)->s_journal);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+ unlock_kernel();
return err;
}
@@ -246,10 +250,14 @@ flags_err:
sizeof(input)))
return -EFAULT;
+ /* AK: not sure the BKL is needed, but this might prevent
+ * races against umount. */
+ lock_kernel();
err = ext4_group_add(sb, &input);
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
jbd2_journal_flush(EXT4_SB(sb)->s_journal);
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+ unlock_kernel();
return err;
}
@@ -262,9 +270,6 @@ flags_err:
#ifdef CONFIG_COMPAT
long ext4_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 EXT4_IOC32_GETFLAGS:
@@ -304,9 +309,6 @@ long ext4_compat_ioctl(struct file *file
default:
return -ENOIOCTLCMD;
}
- lock_kernel();
- ret = ext4_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
- unlock_kernel();
- return ret;
+ return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif
Index: linux/include/linux/ext4_fs.h
===================================================================
--- linux.orig/include/linux/ext4_fs.h
+++ linux/include/linux/ext4_fs.h
@@ -939,8 +939,7 @@ extern int ext4_block_truncate_page(hand
struct address_space *mapping, loff_t from);
/* ioctl.c */
-extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
- unsigned long);
+extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
/* namei.c */
-
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