[PATCH] fs/devfs.c: disallow write and erase if a partition is read-only

[PATCH] fs/devfs.c: disallow write and erase if a partition is read-only

[Jan Luebbe]

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 fs/devfs.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/devfs.c b/fs/devfs.c
index ae48451..074bb34 100644
--- a/fs/devfs.c
+++ b/fs/devfs.c
@@ -49,6 +49,9 @@ static int devfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t s
 {
 	struct cdev *cdev = f->inode;
 
+	if (cdev->flags & DEVFS_PARTITION_READONLY)
+		return -EPERM;
+
 	return cdev_write(cdev, buf, size, f->pos, f->flags);
 }
 
@@ -70,6 +73,9 @@ static int devfs_erase(struct device_d *_dev, FILE *f, size_t count, unsigned lo
 {
 	struct cdev *cdev = f->inode;
 
+	if (cdev->flags & DEVFS_PARTITION_READONLY)
+		return -EPERM;
+
 	if (!cdev->ops->erase)
 		return -ENOSYS;
 
-- 
1.7.10


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Re: [PATCH] fs/devfs.c: disallow write and erase if a partition is read-only

[Sascha Hauer]

On Mon, Jun 25, 2012 at 02:03:27PM +0200, Jan Luebbe wrote:
> Signed-off-by: Jan Luebbe <jlu@pengutronix.de>

Applied, thanks.

Sascha

> ---
>  fs/devfs.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/devfs.c b/fs/devfs.c
> index ae48451..074bb34 100644
> --- a/fs/devfs.c
> +++ b/fs/devfs.c
> @@ -49,6 +49,9 @@ static int devfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t s
>  {
>  	struct cdev *cdev = f->inode;
>  
> +	if (cdev->flags & DEVFS_PARTITION_READONLY)
> +		return -EPERM;
> +
>  	return cdev_write(cdev, buf, size, f->pos, f->flags);
>  }
>  
> @@ -70,6 +73,9 @@ static int devfs_erase(struct device_d *_dev, FILE *f, size_t count, unsigned lo
>  {
>  	struct cdev *cdev = f->inode;
>  
> +	if (cdev->flags & DEVFS_PARTITION_READONLY)
> +		return -EPERM;
> +
>  	if (!cdev->ops->erase)
>  		return -ENOSYS;
>  
> -- 
> 1.7.10
> 
> 
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> 

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