From: Eric Biggers <ebiggers@kernel.org>
To: "Luís Henriques" <lhenriques@suse.de>
Cc: Xiubo Li <xiubli@redhat.com>, Jeff Layton <jlayton@kernel.org>,
"Theodore Y. Ts'o" <tytso@mit.edu>,
Jaegeuk Kim <jaegeuk@kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
linux-fscrypt@vger.kernel.org, ceph-devel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] fscrypt: new helper function - fscrypt_prepare_atomic_open()
Date: Mon, 13 Mar 2023 11:09:04 -0700 [thread overview]
Message-ID: <ZA9mwPUg7H/fq0L8@sol.localdomain> (raw)
In-Reply-To: <20230313123310.13040-2-lhenriques@suse.de>
On Mon, Mar 13, 2023 at 12:33:09PM +0000, Luís Henriques wrote:
> + * The regular open path will use fscrypt_file_open for that, but in the
> + * atomic open a different approach is required.
This should actually be fscrypt_prepare_lookup, not fscrypt_file_open, right?
> +int fscrypt_prepare_atomic_open(struct inode *dir, struct dentry *dentry)
> +{
> + int err;
> +
> + if (!IS_ENCRYPTED(dir))
> + return 0;
> +
> + err = fscrypt_get_encryption_info(dir, true);
> + if (!err && !fscrypt_has_encryption_key(dir)) {
> + spin_lock(&dentry->d_lock);
> + dentry->d_flags |= DCACHE_NOKEY_NAME;
> + spin_unlock(&dentry->d_lock);
> + }
> +
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(fscrypt_prepare_atomic_open);
[...]
> +static inline int fscrypt_prepare_atomic_open(struct inode *dir,
> + struct dentry *dentry)
> +{
> + return -EOPNOTSUPP;
> +}
This has different behavior on unencrypted directories depending on whether
CONFIG_FS_ENCRYPTION is enabled or not. That's bad.
In patch 2, the caller you are introducing has already checked IS_ENCRYPTED().
Also, your kerneldoc comment for fscrypt_prepare_atomic_open() says it is for
*encrypted* directories.
So IMO, just remove the IS_ENCRYPTED() check from the CONFIG_FS_ENCRYPTION
version of fscrypt_prepare_atomic_open().
- Eric
next prev parent reply other threads:[~2023-03-13 18:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-13 12:33 [PATCH 0/2] ceph: fscrypt: fix atomic open bug for encrypted directories Luís Henriques
2023-03-13 12:33 ` [PATCH 1/2] fscrypt: new helper function - fscrypt_prepare_atomic_open() Luís Henriques
2023-03-13 18:09 ` Eric Biggers [this message]
2023-03-14 0:53 ` Xiubo Li
2023-03-14 2:25 ` Eric Biggers
2023-03-14 4:20 ` Xiubo Li
2023-03-14 9:25 ` Luís Henriques
2023-03-14 10:15 ` Luís Henriques
2023-03-14 17:56 ` Eric Biggers
2023-03-15 11:08 ` Luís Henriques
2023-03-15 17:12 ` Eric Biggers
2023-03-15 17:59 ` Luís Henriques
2023-03-13 12:33 ` [PATCH 2/2] ceph: switch atomic open to use new fscrypt helper Luís Henriques
2023-03-13 18:11 ` Eric Biggers
2023-03-13 18:42 ` Luís Henriques
2023-03-14 0:38 ` Xiubo Li
2023-03-14 9:27 ` Luís Henriques
2023-03-13 17:11 ` [PATCH 0/2] ceph: fscrypt: fix atomic open bug for encrypted directories Jeff Layton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZA9mwPUg7H/fq0L8@sol.localdomain \
--to=ebiggers@kernel.org \
--cc=ceph-devel@vger.kernel.org \
--cc=idryomov@gmail.com \
--cc=jaegeuk@kernel.org \
--cc=jlayton@kernel.org \
--cc=lhenriques@suse.de \
--cc=linux-fscrypt@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=tytso@mit.edu \
--cc=xiubli@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).