linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: introduce data read/write showing path info

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Message-ID: <Yjj/L5/kwc5Oo74E@gmail.com>
Date:   Mon, 21 Mar 2022 22:41:51 +0000
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce data read/write showing path
 info

On Mon, Mar 21, 2022 at 03:33:15PM -0700, Jaegeuk Kim wrote:
> This was used in Android for a long time. Let's upstream it.
> 

You still need to explain why this is useful.

> +static inline char *f2fs_get_pathname(char *buf, int len, struct inode *inode)
> +{
> +	char *path;
> +	struct dentry *d;
> +
> +	/*
> +	 * d_obtain_alias() will either iput() if it locates an existing
> +	 * dentry or transfer the reference to the new dentry created.
> +	 * So get an extra reference here.
> +	 */
> +	ihold(inode);
> +	d = d_obtain_alias(inode);

Why does this use d_obtain_alias() to get a dentry instead of just using the
dentry of the open file?

- Eric