linux-kernel - Re: [PATCH] fs: export vfs_stat() and vfs

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Date:   Thu, 26 Nov 2020 17:48:25 +0800
From:   Yicong Yang <yangyicong@...ilicon.com>
To:     Christoph Hellwig <hch@....de>
CC:     <viro@...iv.linux.org.uk>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <prime.zeng@...wei.com>,
        <linuxarm@...wei.com>
Subject: Re: [PATCH] fs: export vfs_stat() and vfs_fstatat()

On 2020/11/26 17:15, Christoph Hellwig wrote:
> On Thu, Nov 26, 2020 at 05:08:26PM +0800, Yicong Yang wrote:
>>> And why would you want to use them in kernel module?  Please explain
>>> that in the patch that exports them, and please send that patch in the
>>> same series as the patches adding the users.
>> we're using it in the modules for testing our crypto driver on our CI system.
>> is it mandatory to upstream it if we want to use this function?
> Yes.  And chances are that you do not actaully need these functions
> either, but to suggest a better placement I need to actually see the
> code.
> .

Sorry for not describing the issues I met correctly in the commit message.
Actually we're using inline function vfs_stat() for getting the
attributes, which calls vfs_fstatat():

static inline int vfs_stat(const char __user *filename, struct kstat *stat)
{
	return vfs_fstatat(AT_FDCWD, filename, stat, 0);
}

after the vfs_fstatat is out-of-line it will make the moduler user of vfs_stat()
broken:

[ 5328.903677] crypto_zip_perf_test: Unknown symbol vfs_fstatat (err -2)

so the simplest way i think is directly export the vfs_fstatat().

Thanks,
Yicong




>