[PATCH] fs/ext4: add missing ext4_resize_end

[PATCH] fs/ext4: add missing ext4_resize_end

[Djalal Harouni]

Online resize ioctls 'EXT4_IOC_GROUP_EXTEND' and 'EXT4_IOC_GROUP_ADD'
call ext4_resize_begin() to check permissions and to set the
EXT4_RESIZING bit lock, they do their work and they must finish with
ext4_resize_end() which calls clear_bit_unlock() to unlock and to
avoid -EBUSY errors for the next resize operations.

This patch adds the missing ext4_resize_end() calls on error paths.

Patch tested.

Cc: stable@vger.kernel.org
Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
---
 fs/ext4/ioctl.c |   28 ++++++++++++++++++----------
 1 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index a567968..ab25f57 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -182,19 +182,22 @@ setversion_out:
 		if (err)
 			return err;
 
-		if (get_user(n_blocks_count, (__u32 __user *)arg))
-			return -EFAULT;
+		if (get_user(n_blocks_count, (__u32 __user *)arg)) {
+			err = -EFAULT;
+			goto group_extend_out;
+		}
 
 		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 			ext4_msg(sb, KERN_ERR,
 				 "Online resizing not supported with bigalloc");
-			return -EOPNOTSUPP;
+			err = -EOPNOTSUPP;
+			goto group_extend_out;
 		}
 
 		err = mnt_want_write(filp->f_path.mnt);
 		if (err)
-			return err;
+			goto group_extend_out;
 
 		err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 		if (EXT4_SB(sb)->s_journal) {
@@ -204,9 +207,10 @@ setversion_out:
 		}
 		if (err == 0)
 			err = err2;
+
 		mnt_drop_write(filp->f_path.mnt);
+group_extend_out:
 		ext4_resize_end(sb);
-
 		return err;
 	}
 
@@ -267,19 +271,22 @@ mext_out:
 			return err;
 
 		if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
-				sizeof(input)))
-			return -EFAULT;
+				sizeof(input))) {
+			err = -EFAULT;
+			goto group_add_out;
+		}
 
 		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 			       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 			ext4_msg(sb, KERN_ERR,
 				 "Online resizing not supported with bigalloc");
-			return -EOPNOTSUPP;
+			err = -EOPNOTSUPP;
+			goto group_add_out;
 		}
 
 		err = mnt_want_write(filp->f_path.mnt);
 		if (err)
-			return err;
+			goto group_add_out;
 
 		err = ext4_group_add(sb, &input);
 		if (EXT4_SB(sb)->s_journal) {
@@ -289,9 +296,10 @@ mext_out:
 		}
 		if (err == 0)
 			err = err2;
+
 		mnt_drop_write(filp->f_path.mnt);
+group_add_out:
 		ext4_resize_end(sb);
-
 		return err;
 	}
 
-- 
1.7.1

Re: [PATCH] fs/ext4: add missing ext4_resize_end

[Yongqiang Yang]

Thanks.

The patch looks good.   I have to update the new resize patch too.

Yongqiang.

On Thu, Dec 22, 2011 at 11:00 PM, Djalal Harouni <tixxdz@opendz.org> wrote:
> Online resize ioctls 'EXT4_IOC_GROUP_EXTEND' and 'EXT4_IOC_GROUP_ADD'
> call ext4_resize_begin() to check permissions and to set the
> EXT4_RESIZING bit lock, they do their work and they must finish with
> ext4_resize_end() which calls clear_bit_unlock() to unlock and to
> avoid -EBUSY errors for the next resize operations.
>
> This patch adds the missing ext4_resize_end() calls on error paths.
>
> Patch tested.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
> ---
>  fs/ext4/ioctl.c |   28 ++++++++++++++++++----------
>  1 files changed, 18 insertions(+), 10 deletions(-)
>
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index a567968..ab25f57 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -182,19 +182,22 @@ setversion_out:
>                if (err)
>                        return err;
>
> -               if (get_user(n_blocks_count, (__u32 __user *)arg))
> -                       return -EFAULT;
> +               if (get_user(n_blocks_count, (__u32 __user *)arg)) {
> +                       err = -EFAULT;
> +                       goto group_extend_out;
> +               }
>
>                if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
>                               EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
>                        ext4_msg(sb, KERN_ERR,
>                                 "Online resizing not supported with bigalloc");
> -                       return -EOPNOTSUPP;
> +                       err = -EOPNOTSUPP;
> +                       goto group_extend_out;
>                }
>
>                err = mnt_want_write(filp->f_path.mnt);
>                if (err)
> -                       return err;
> +                       goto group_extend_out;
>
>                err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
>                if (EXT4_SB(sb)->s_journal) {
> @@ -204,9 +207,10 @@ setversion_out:
>                }
>                if (err == 0)
>                        err = err2;
> +
>                mnt_drop_write(filp->f_path.mnt);
> +group_extend_out:
>                ext4_resize_end(sb);
> -
>                return err;
>        }
>
> @@ -267,19 +271,22 @@ mext_out:
>                        return err;
>
>                if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
> -                               sizeof(input)))
> -                       return -EFAULT;
> +                               sizeof(input))) {
> +                       err = -EFAULT;
> +                       goto group_add_out;
> +               }
>
>                if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
>                               EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
>                        ext4_msg(sb, KERN_ERR,
>                                 "Online resizing not supported with bigalloc");
> -                       return -EOPNOTSUPP;
> +                       err = -EOPNOTSUPP;
> +                       goto group_add_out;
>                }
>
>                err = mnt_want_write(filp->f_path.mnt);
>                if (err)
> -                       return err;
> +                       goto group_add_out;
>
>                err = ext4_group_add(sb, &input);
>                if (EXT4_SB(sb)->s_journal) {
> @@ -289,9 +296,10 @@ mext_out:
>                }
>                if (err == 0)
>                        err = err2;
> +
>                mnt_drop_write(filp->f_path.mnt);
> +group_add_out:
>                ext4_resize_end(sb);
> -
>                return err;
>        }
>
> --
> 1.7.1
> --
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-- 
Best Wishes
Yongqiang Yang
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Re: [PATCH] fs/ext4: add missing ext4_resize_end

[Djalal Harouni]

On Fri, Dec 23, 2011 at 09:14:20AM +0800, Yongqiang Yang wrote:
> Thanks.
> 
> The patch looks good.   I have to update the new resize patch too.
> 
> Yongqiang.
> 
> On Thu, Dec 22, 2011 at 11:00 PM, Djalal Harouni <tixxdz@opendz.org> wrote:
> > Online resize ioctls 'EXT4_IOC_GROUP_EXTEND' and 'EXT4_IOC_GROUP_ADD'
> > call ext4_resize_begin() to check permissions and to set the
> > EXT4_RESIZING bit lock, they do their work and they must finish with
> > ext4_resize_end() which calls clear_bit_unlock() to unlock and to
> > avoid -EBUSY errors for the next resize operations.
> >
> > This patch adds the missing ext4_resize_end() calls on error paths.
Any news on this one ?

If we call EXT4_IOC_GROUP_EXTEND ioctl and get_user() fails with -EFAULT
then any new call will return -EBUSY, unless we unmount/mount the fs.

In rare situations this can lead to a corrupt filesystem, I've experienced
this, but I'm not sure what I did. fsck fix it.

Thanks.

-- 
tixxdz
http://opendz.org

Re: [PATCH] fs/ext4: add missing ext4_resize_end

[Ted Ts'o]

On Thu, Dec 22, 2011 at 04:00:57PM +0100, Djalal Harouni wrote:
> Online resize ioctls 'EXT4_IOC_GROUP_EXTEND' and 'EXT4_IOC_GROUP_ADD'
> call ext4_resize_begin() to check permissions and to set the
> EXT4_RESIZING bit lock, they do their work and they must finish with
> ext4_resize_end() which calls clear_bit_unlock() to unlock and to
> avoid -EBUSY errors for the next resize operations.
> 
> This patch adds the missing ext4_resize_end() calls on error paths.
> 
> Patch tested.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Djalal Harouni <tixxdz@opendz.org>

Applied, thanks.

					- Ted