Re: [PATCH] ceph: fix up test_dummy_encryption handling for new mount API
From: Xiubo Li
Date: Wed Jul 13 2022 - 06:49:54 EST
On 7/13/22 6:42 PM, Jeff Layton wrote:
On Wed, 2022-07-13 at 16:56 +0800, xiubli@xxxxxxxxxx wrote:
From: Xiubo Li <xiubli@xxxxxxxxxx>
From Eric the "fscrypt_set_test_dummy_encryption()" will be removed
in the next circle. Switch it to new APIs.
Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
---
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@xxxxxxxxxx>
Thanks Jeff.
I will fold this into the previous commit.
-- Xiubo