From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org,
ebiggers@kernel.org
Subject: [RFC PATCH v2 04/18] fscrypt: add fscrypt_new_context_from_inode
Date: Fri, 4 Sep 2020 12:05:23 -0400 [thread overview]
Message-ID: <20200904160537.76663-5-jlayton@kernel.org> (raw)
In-Reply-To: <20200904160537.76663-1-jlayton@kernel.org>
CephFS will need to be able to generate a context for a new "prepared"
inode. Add a new routine for getting the context out of an in-core
inode.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/crypto/policy.c | 20 ++++++++++++++++++++
include/linux/fscrypt.h | 1 +
2 files changed, 21 insertions(+)
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index c56ad886f7d7..10eddd113a21 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -670,6 +670,26 @@ int fscrypt_set_context(struct inode *inode, void *fs_data)
}
EXPORT_SYMBOL_GPL(fscrypt_set_context);
+/**
+ * fscrypt_context_from_inode() - fetch the encryption context out of in-core inode
+ * @ctx: where context should be written
+ * @inode: inode from which to fetch context
+ *
+ * Given an in-core prepared, but not-necessarily fully-instantiated inode,
+ * generate an encryption context from its policy and write it to ctx.
+ *
+ * Returns size of the context.
+ */
+int fscrypt_new_context_from_inode(union fscrypt_context *ctx, struct inode *inode)
+{
+ struct fscrypt_info *ci = inode->i_crypt_info;
+
+ BUILD_BUG_ON(sizeof(*ctx) != FSCRYPT_SET_CONTEXT_MAX_SIZE);
+
+ return fscrypt_new_context_from_policy(ctx, &ci->ci_policy, ci->ci_nonce);
+}
+EXPORT_SYMBOL_GPL(fscrypt_new_context_from_inode);
+
/**
* fscrypt_set_test_dummy_encryption() - handle '-o test_dummy_encryption'
* @sb: the filesystem on which test_dummy_encryption is being specified
diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index 16d673c50448..0ddbd27a2e58 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -157,6 +157,7 @@ int fscrypt_ioctl_get_policy_ex(struct file *filp, void __user *arg);
int fscrypt_ioctl_get_nonce(struct file *filp, void __user *arg);
int fscrypt_has_permitted_context(struct inode *parent, struct inode *child);
int fscrypt_set_context(struct inode *inode, void *fs_data);
+int fscrypt_new_context_from_inode(union fscrypt_context *ctx, struct inode *inode);
struct fscrypt_dummy_context {
const union fscrypt_context *ctx;
--
2.26.2
next prev parent reply other threads:[~2020-09-04 16:07 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-04 16:05 [RFC PATCH v2 00/18] ceph+fscrypt: context, filename and symlink support Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 01/18] vfs: export new_inode_pseudo Jeff Layton
2020-09-08 3:38 ` Eric Biggers
2020-09-08 11:27 ` Jeff Layton
2020-09-08 22:31 ` Eric Biggers
2020-09-09 10:47 ` Jeff Layton
2020-09-09 16:12 ` Eric Biggers
2020-09-09 16:51 ` Jeff Layton
2020-09-09 18:49 ` Eric Biggers
2020-09-09 19:24 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 02/18] fscrypt: drop unused inode argument from fscrypt_fname_alloc_buffer Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 03/18] fscrypt: export fscrypt_d_revalidate Jeff Layton
2020-09-04 16:05 ` Jeff Layton [this message]
2020-09-08 3:48 ` [RFC PATCH v2 04/18] fscrypt: add fscrypt_new_context_from_inode Eric Biggers
2020-09-08 11:29 ` Jeff Layton
2020-09-08 12:29 ` Jeff Layton
2020-09-08 22:34 ` Eric Biggers
2020-09-04 16:05 ` [RFC PATCH v2 05/18] fscrypt: don't balk when inode is already marked encrypted Jeff Layton
2020-09-08 3:52 ` Eric Biggers
2020-09-08 12:54 ` Jeff Layton
2020-09-08 23:08 ` Eric Biggers
2020-09-04 16:05 ` [RFC PATCH v2 06/18] fscrypt: move nokey_name conversion to separate function and export it Jeff Layton
2020-09-08 3:55 ` Eric Biggers
2020-09-08 12:50 ` Jeff Layton
2020-09-08 22:53 ` Eric Biggers
2020-09-09 16:02 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 07/18] lib: lift fscrypt base64 conversion into lib/ Jeff Layton
2020-09-08 3:59 ` Eric Biggers
2020-09-08 12:51 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 08/18] ceph: add fscrypt ioctls Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 09/18] ceph: crypto context handling for ceph Jeff Layton
2020-09-08 4:29 ` Eric Biggers
2020-09-08 16:14 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 10/18] ceph: preallocate inode for ops that may create one Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 11/18] ceph: add routine to create context prior to RPC Jeff Layton
2020-09-08 4:43 ` Eric Biggers
2020-09-04 16:05 ` [RFC PATCH v2 12/18] ceph: set S_ENCRYPTED bit if new inode has encryption.ctx xattr Jeff Layton
2020-09-08 4:57 ` Eric Biggers
2020-09-09 12:20 ` Jeff Layton
2020-09-09 15:53 ` Jeff Layton
2020-09-09 16:33 ` Eric Biggers
2020-09-09 17:19 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 13/18] ceph: make ceph_msdc_build_path use ref-walk Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 14/18] ceph: add encrypted fname handling to ceph_mdsc_build_path Jeff Layton
2020-09-08 5:06 ` Eric Biggers
2020-09-09 12:24 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 15/18] ceph: make d_revalidate call fscrypt revalidator for encrypted dentries Jeff Layton
2020-09-08 5:12 ` Eric Biggers
2020-09-09 12:26 ` Jeff Layton
2020-09-09 16:18 ` Eric Biggers
2020-09-04 16:05 ` [RFC PATCH v2 16/18] ceph: add support to readdir for encrypted filenames Jeff Layton
2020-09-08 5:34 ` Eric Biggers
2020-09-09 13:02 ` Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 17/18] ceph: add fscrypt support to ceph_fill_trace Jeff Layton
2020-09-04 16:05 ` [RFC PATCH v2 18/18] ceph: create symlinks with encrypted and base64-encoded targets Jeff Layton
2020-09-04 16:11 ` Jeff Layton
2020-09-08 5:43 ` Eric Biggers
2020-09-08 5:54 ` [RFC PATCH v2 00/18] ceph+fscrypt: context, filename and symlink support Eric Biggers
2020-09-08 12:09 ` Jeff Layton
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