linux-kernel - Re: [PATCH 16/21] sysfs: implement bin

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <a781481a0705010725t310ecb31yde475412f620d6d6@mail.gmail.com>
Date:	Tue, 1 May 2007 19:55:38 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Tejun Heo" <htejun@...il.com>
Cc:	gregkh@...e.de, dmitry.torokhov@...il.com,
	cornelia.huck@...ibm.com, oneukum@...e.de, rpurdie@...ys.net,
	stern@...land.harvard.edu, maneesh@...ibm.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/21] sysfs: implement bin_buffer

On 4/28/07, Tejun Heo <htejun@...il.com> wrote:
> Implement bin_buffer which contains a mutex and pointer to PAGE_SIZE
> buffer to properly synchronize accesses to per-openfile buffer and
> prepare for immediate-kobj-disconnect.
>
> Signed-off-by: Tejun Heo <htejun@...il.com>
> ---
> [...]
> @@ -135,14 +160,22 @@ static int open(struct inode * inode, struct file * file)
>                 goto Error;
>
>         error = -ENOMEM;
> -       file->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
> -       if (!file->private_data)
> +       bb = kzalloc(sizeof(*bb), GFP_KERNEL);
> +       if (!bb)
>                 goto Error;
>
> +       bb->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);

You could simply do a __get_free_page() here instead of a kmalloc(PAGE_SIZE).

> @@ -155,11 +188,12 @@ static int release(struct inode * inode, struct file * file)
>         struct kobject * kobj = to_kobj(file->f_path.dentry->d_parent);
>         struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
>         struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
> -       u8 * buffer = file->private_data;
> +       struct bin_buffer *bb = file->private_data;
>
>         kobject_put(kobj);
>         module_put(attr->attr.owner);
> -       kfree(buffer);
> +       kfree(bb->buffer);

And so this would become free_page().
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/