From: Eric Biggers <ebiggers@kernel.org>
To: Jeff Layton <jlayton@kernel.org>
Cc: ceph-devel@vger.kernel.org, linux-fscrypt@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [RFC PATCH v3 05/16] fscrypt: make fscrypt_fname_disk_to_usr return whether result is nokey name
Date: Mon, 14 Sep 2020 17:23:18 -0700 [thread overview]
Message-ID: <20200915002318.GE899@sol.localdomain> (raw)
In-Reply-To: <20200914191707.380444-6-jlayton@kernel.org>
On Mon, Sep 14, 2020 at 03:16:56PM -0400, Jeff Layton wrote:
> Ceph will sometimes need to know whether the resulting name from this
> function is a nokey name, in order to set the dentry flags without
> racy checks on the parent inode.
>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
> fs/crypto/fname.c | 5 ++++-
> fs/crypto/hooks.c | 4 ++--
> fs/ext4/dir.c | 3 ++-
> fs/ext4/namei.c | 6 ++++--
> fs/f2fs/dir.c | 3 ++-
> fs/ubifs/dir.c | 4 +++-
> include/linux/fscrypt.h | 4 ++--
> 7 files changed, 19 insertions(+), 10 deletions(-)
>
> diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
> index 0d41eb4a5493..b97a81ccd838 100644
> --- a/fs/crypto/fname.c
> +++ b/fs/crypto/fname.c
> @@ -353,6 +353,7 @@ EXPORT_SYMBOL(fscrypt_encode_nokey_name);
> * @oname: output buffer for the user-presentable filename. The caller must
> * have allocated enough space for this, e.g. using
> * fscrypt_fname_alloc_buffer().
> + * @is_nokey: set to true if oname is a no-key name
> *
> * If the key is available, we'll decrypt the disk name. Otherwise, we'll
> * encode it for presentation in fscrypt_nokey_name format.
> @@ -363,7 +364,8 @@ EXPORT_SYMBOL(fscrypt_encode_nokey_name);
> int fscrypt_fname_disk_to_usr(const struct inode *inode,
> u32 hash, u32 minor_hash,
> const struct fscrypt_str *iname,
> - struct fscrypt_str *oname)
> + struct fscrypt_str *oname,
> + bool *is_nokey)
> {
> const struct qstr qname = FSTR_TO_QSTR(iname);
> struct fscrypt_nokey_name nokey_name;
> @@ -411,6 +413,7 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode,
> size = FSCRYPT_NOKEY_NAME_MAX;
> }
> oname->len = fscrypt_base64_encode((const u8 *)&nokey_name, size, oname->name);
> + *is_nokey = true;
> return 0;
> }
Can you do:
if (is_nokey)
*is_nokey = true;
... so that callers who don't care can just pass NULL?
Also, to make the kerneldoc clearer:
* @is_nokey: (output) if non-NULL, set to true if the key wasn't available
*
* If the key is available, we'll decrypt the disk name. Otherwise, we'll
* encode it for presentation in fscrypt_nokey_name format and set
* *is_nokey=true. See struct fscrypt_nokey_name for details.
next prev parent reply other threads:[~2020-09-15 0:23 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 19:16 [RFC PATCH v3 00/16] ceph+fscrypt: context, filename and symlink support Jeff Layton
2020-09-14 19:16 ` [RFC PATCH v3 01/16] vfs: export new_inode_pseudo Jeff Layton
2020-09-14 23:33 ` Eric Biggers
2020-09-23 3:41 ` Al Viro
2020-09-23 11:19 ` Jeff Layton
2020-09-14 19:16 ` [RFC PATCH v3 02/16] fscrypt: export fscrypt_base64_encode and fscrypt_base64_decode Jeff Layton
2020-09-14 23:44 ` Eric Biggers
2020-09-14 19:16 ` [RFC PATCH v3 03/16] fscrypt: export fscrypt_d_revalidate Jeff Layton
2020-09-15 0:04 ` Eric Biggers
2020-09-14 19:16 ` [RFC PATCH v3 04/16] fscrypt: add fscrypt_context_for_new_inode Jeff Layton
2020-09-15 0:15 ` Eric Biggers
2020-09-14 19:16 ` [RFC PATCH v3 05/16] fscrypt: make fscrypt_fname_disk_to_usr return whether result is nokey name Jeff Layton
2020-09-15 0:23 ` Eric Biggers [this message]
2020-09-14 19:16 ` [RFC PATCH v3 06/16] ceph: add fscrypt ioctls Jeff Layton
2020-09-15 0:45 ` Eric Biggers
2020-09-15 12:08 ` Jeff Layton
2020-09-14 19:16 ` [RFC PATCH v3 07/16] ceph: crypto context handling for ceph Jeff Layton
2020-09-15 1:00 ` Eric Biggers
2020-09-14 19:16 ` [RFC PATCH v3 08/16] ceph: implement -o test_dummy_encryption mount option Jeff Layton
2020-09-15 1:23 ` Eric Biggers
2020-09-16 12:49 ` Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 09/16] ceph: preallocate inode for ops that may create one Jeff Layton
2020-09-15 1:30 ` Eric Biggers
2020-09-16 12:41 ` Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 10/16] ceph: add routine to create context prior to RPC Jeff Layton
2020-09-15 1:37 ` Eric Biggers
2020-09-16 12:18 ` Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 11/16] ceph: make ceph_msdc_build_path use ref-walk Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 12/16] ceph: add encrypted fname handling to ceph_mdsc_build_path Jeff Layton
2020-09-15 1:41 ` Eric Biggers
2020-09-16 12:30 ` Jeff Layton
2020-09-16 17:36 ` Eric Biggers
2020-09-16 18:04 ` Jeff Layton
2020-09-16 18:42 ` Eric Biggers
2020-09-14 19:17 ` [RFC PATCH v3 13/16] ceph: make d_revalidate call fscrypt revalidator for encrypted dentries Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 14/16] ceph: add support to readdir for encrypted filenames Jeff Layton
2020-09-15 1:57 ` Eric Biggers
2020-09-15 13:27 ` Jeff Layton
2020-09-15 20:40 ` Eric Biggers
2020-09-16 12:16 ` Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 15/16] ceph: add fscrypt support to ceph_fill_trace Jeff Layton
2020-09-14 19:17 ` [RFC PATCH v3 16/16] ceph: create symlinks with encrypted and base64-encoded targets Jeff Layton
2020-09-15 2:07 ` Eric Biggers
2020-09-15 14:05 ` Jeff Layton
2020-09-15 20:49 ` Eric Biggers
2020-09-16 12:15 ` Jeff Layton
2020-09-15 2:13 ` [RFC PATCH v3 00/16] ceph+fscrypt: context, filename and symlink support Eric Biggers
2020-09-15 13:38 ` 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=20200915002318.GE899@sol.localdomain \
--to=ebiggers@kernel.org \
--cc=ceph-devel@vger.kernel.org \
--cc=jlayton@kernel.org \
--cc=linux-fscrypt@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
/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).