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Date: Wed, 13 Jul 2022 06:42:31 -0400
From: Jeff Layton <jlayton@...nel.org>
To: xiubli@...hat.com, ceph-devel@...r.kernel.org, idryomov@...il.com
Cc: vshankar@...hat.com, linux-kernel@...r.kernel.org,
Eric Biggers <ebiggers@...nel.org>
Subject: Re: [PATCH] ceph: fix up test_dummy_encryption handling for new
mount API
On Wed, 2022-07-13 at 16:56 +0800, xiubli@...hat.com wrote:
> From: Xiubo Li <xiubli@...hat.com>
>
> From Eric the "fscrypt_set_test_dummy_encryption()" will be removed
> in the next circle. Switch it to new APIs.
>
> Cc: Eric Biggers <ebiggers@...nel.org>
> Cc: Jeff Layton <jlayton@...nel.org>
> Signed-off-by: Xiubo Li <xiubli@...hat.com>
> ---
> fs/ceph/crypto.c | 4 +--
> fs/ceph/super.c | 94 ++++++++++++++++++++++++------------------------
> fs/ceph/super.h | 5 ++-
> 3 files changed, 52 insertions(+), 51 deletions(-)
>
> diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
> index 7e0c48e12554..5b807f8f4c69 100644
> --- a/fs/ceph/crypto.c
> +++ b/fs/ceph/crypto.c
> @@ -127,7 +127,7 @@ static bool ceph_crypt_empty_dir(struct inode *inode)
>
> static const union fscrypt_policy *ceph_get_dummy_policy(struct super_block *sb)
> {
> - return ceph_sb_to_client(sb)->dummy_enc_policy.policy;
> + return ceph_sb_to_client(sb)->fsc_dummy_enc_policy.policy;
> }
>
> static struct fscrypt_operations ceph_fscrypt_ops = {
> @@ -144,7 +144,7 @@ void ceph_fscrypt_set_ops(struct super_block *sb)
>
> void ceph_fscrypt_free_dummy_policy(struct ceph_fs_client *fsc)
> {
> - fscrypt_free_dummy_policy(&fsc->dummy_enc_policy);
> + fscrypt_free_dummy_policy(&fsc->fsc_dummy_enc_policy);
> }
>
> int ceph_fscrypt_prepare_context(struct inode *dir, struct inode *inode,
> diff --git a/fs/ceph/super.c b/fs/ceph/super.c
> index fa59a804b32c..4ac4a90755a2 100644
> --- a/fs/ceph/super.c
> +++ b/fs/ceph/super.c
> @@ -591,10 +591,16 @@ static int ceph_parse_mount_param(struct fs_context *fc,
> break;
> case Opt_test_dummy_encryption:
> #ifdef CONFIG_FS_ENCRYPTION
> - kfree(fsopt->test_dummy_encryption);
> - fsopt->test_dummy_encryption = param->string;
> - param->string = NULL;
> - fsopt->flags |= CEPH_MOUNT_OPT_TEST_DUMMY_ENC;
> + fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
> + ret = fscrypt_parse_test_dummy_encryption(param,
> + &fsopt->dummy_enc_policy);
> + if (ret == -EINVAL) {
> + warnfc(fc, "Value of option \"%s\" is unrecognized",
> + param->key);
> + } else if (ret == -EEXIST) {
> + warnfc(fc, "Conflicting test_dummy_encryption options");
> + ret = -EINVAL;
> + }
> #else
> warnfc(fc,
> "FS encryption not supported: test_dummy_encryption mount option ignored");
> @@ -620,7 +626,7 @@ static void destroy_mount_options(struct ceph_mount_options *args)
> kfree(args->server_path);
> kfree(args->fscache_uniq);
> kfree(args->mon_addr);
> - kfree(args->test_dummy_encryption);
> + fscrypt_free_dummy_policy(&args->dummy_enc_policy);
> kfree(args);
> }
>
> @@ -1080,51 +1086,47 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
> return root;
> }
>
> -#ifdef CONFIG_FS_ENCRYPTION
> -static int ceph_set_test_dummy_encryption(struct super_block *sb, struct fs_context *fc,
> - struct ceph_mount_options *fsopt)
> +static int ceph_apply_test_dummy_encryption(struct super_block *sb,
> + struct fs_context *fc,
> + struct ceph_mount_options *fsopt)
> {
> - /*
> - * No changing encryption context on remount. Note that
> - * fscrypt_set_test_dummy_encryption will validate the version
> - * string passed in (if any).
> - */
> - if (fsopt->flags & CEPH_MOUNT_OPT_TEST_DUMMY_ENC) {
> - struct ceph_fs_client *fsc = sb->s_fs_info;
> - int err = 0;
> + struct ceph_fs_client *fsc = sb->s_fs_info;
> + int err;
>
> - if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE && !fsc->dummy_enc_policy.policy) {
> - errorfc(fc, "Can't set test_dummy_encryption on remount");
> - return -EEXIST;
> - }
> + if (!fscrypt_is_dummy_policy_set(&fsopt->dummy_enc_policy))
> + return 0;
>
> - err = fscrypt_set_test_dummy_encryption(sb,
> - fsc->mount_options->test_dummy_encryption,
> - &fsc->dummy_enc_policy);
> - if (err) {
> - if (err == -EEXIST)
> - errorfc(fc, "Can't change test_dummy_encryption on remount");
> - else if (err == -EINVAL)
> - errorfc(fc, "Value of option \"%s\" is unrecognized",
> - fsc->mount_options->test_dummy_encryption);
> - else
> - errorfc(fc, "Error processing option \"%s\" [%d]",
> - fsc->mount_options->test_dummy_encryption, err);
> - return err;
> - }
> - warnfc(fc, "test_dummy_encryption mode enabled");
> + /* No changing encryption context on remount. */
> + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE &&
> + !fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
> + if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
> + &fsc->fsc_dummy_enc_policy))
> + return 0;
> + errorfc(fc, "Can't set test_dummy_encryption on remount");
> + return -EINVAL;
> }
> +
> + /* Also make sure fsopt doesn't contain a conflicting value. */
> + if (fscrypt_is_dummy_policy_set(&fsc->fsc_dummy_enc_policy)) {
> + if (fscrypt_dummy_policies_equal(&fsopt->dummy_enc_policy,
> + &fsc->fsc_dummy_enc_policy))
> + return 0;
> + errorfc(fc, "Conflicting test_dummy_encryption options");
> + return -EINVAL;
> + }
> +
> + fsc->fsc_dummy_enc_policy = fsopt->dummy_enc_policy;
> + memset(&fsopt->dummy_enc_policy, 0, sizeof(fsopt->dummy_enc_policy));
> +
> + err = fscrypt_add_test_dummy_key(sb, &fsc->fsc_dummy_enc_policy);
> + if (err) {
> + errorfc(fc, "Error adding test dummy encryption key, %d", err);
> + return err;
> + }
> +
> + warnfc(fc, "test_dummy_encryption mode enabled");
> return 0;
> }
> -#else
> -static inline int ceph_set_test_dummy_encryption(struct super_block *sb, struct fs_context *fc,
> - struct ceph_mount_options *fsopt)
> -{
> - if (fsopt->flags & CEPH_MOUNT_OPT_TEST_DUMMY_ENC)
> - warnfc(fc, "test_dummy_encryption mode ignored");
> - return 0;
> -}
> -#endif
>
> /*
> * mount: join the ceph cluster, and open root directory.
> @@ -1154,7 +1156,7 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
> goto out;
> }
>
> - err = ceph_set_test_dummy_encryption(fsc->sb, fc, fsc->mount_options);
> + err = ceph_apply_test_dummy_encryption(fsc->sb, fc, fsc->mount_options);
> if (err)
> goto out;
>
> @@ -1373,7 +1375,7 @@ static int ceph_reconfigure_fc(struct fs_context *fc)
> struct super_block *sb = fc->root->d_sb;
> struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
>
> - err = ceph_set_test_dummy_encryption(sb, fc, fsopt);
> + err = ceph_apply_test_dummy_encryption(sb, fc, fsopt);
> if (err)
> return err;
>
> diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> index bfc8bfcea799..5ea0ac6450dd 100644
> --- a/fs/ceph/super.h
> +++ b/fs/ceph/super.h
> @@ -44,7 +44,6 @@
> #define CEPH_MOUNT_OPT_ASYNC_DIROPS (1<<15) /* allow async directory ops */
> #define CEPH_MOUNT_OPT_NOPAGECACHE (1<<16) /* bypass pagecache altogether */
> #define CEPH_MOUNT_OPT_SPARSEREAD (1<<17) /* always do sparse reads */
> -#define CEPH_MOUNT_OPT_TEST_DUMMY_ENC (1<<18) /* enable dummy encryption (for testing) */
>
> #define CEPH_MOUNT_OPT_DEFAULT \
> (CEPH_MOUNT_OPT_DCACHE | \
> @@ -101,7 +100,7 @@ struct ceph_mount_options {
> char *server_path; /* default NULL (means "/") */
> char *fscache_uniq; /* default NULL */
> char *mon_addr;
> - char *test_dummy_encryption; /* default NULL */
> + struct fscrypt_dummy_policy dummy_enc_policy;
> };
>
> #define CEPH_ASYNC_CREATE_CONFLICT_BITS 8
> @@ -148,7 +147,7 @@ struct ceph_fs_client {
> struct fscache_volume *fscache;
> #endif
> #ifdef CONFIG_FS_ENCRYPTION
> - struct fscrypt_dummy_policy dummy_enc_policy;
> + struct fscrypt_dummy_policy fsc_dummy_enc_policy;
> #endif
> };
>
LGTM
Reviewed-by: Jeff Layton <jlayton@...nel.org>
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