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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 12/18] ceph: set S_ENCRYPTED bit if new inode has encryption.ctx xattr
Date: Fri,  4 Sep 2020 12:05:31 -0400
Message-ID: <20200904160537.76663-13-jlayton@kernel.org> (raw)
In-Reply-To: <20200904160537.76663-1-jlayton@kernel.org>

This hack fixes a chicken-and-egg problem when fetching inodes from the
server. Once we move to a dedicated field in the inode, then this should
be able to go away.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/crypto.h |  4 ++++
 fs/ceph/inode.c  |  4 ++++
 fs/ceph/super.h  |  1 +
 fs/ceph/xattr.c  | 32 ++++++++++++++++++++++++++++++++
 4 files changed, 41 insertions(+)

diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h
index bf893bd215c3..1b11e9af165e 100644
--- a/fs/ceph/crypto.h
+++ b/fs/ceph/crypto.h
@@ -10,12 +10,16 @@
 
 #define	CEPH_XATTR_NAME_ENCRYPTION_CONTEXT	"encryption.ctx"
 
+#define DUMMY_ENCRYPTION_ENABLED(fsc) ((fsc)->dummy_enc_ctx.ctx != NULL)
+
 int ceph_fscrypt_set_ops(struct super_block *sb);
 int ceph_fscrypt_prepare_context(struct inode *dir, struct inode *inode,
 				 struct ceph_acl_sec_ctx *as);
 
 #else /* CONFIG_FS_ENCRYPTION */
 
+#define DUMMY_ENCRYPTION_ENABLED(fsc) (0)
+
 static inline int ceph_fscrypt_set_ops(struct super_block *sb)
 {
 	return 0;
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 651148194316..c1c1fe2547f9 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -964,6 +964,10 @@ int ceph_fill_inode(struct inode *inode, struct page *locked_page,
 		ceph_forget_all_cached_acls(inode);
 		ceph_security_invalidate_secctx(inode);
 		xattr_blob = NULL;
+		if ((inode->i_state & I_NEW) &&
+		    (DUMMY_ENCRYPTION_ENABLED(mdsc->fsc) ||
+		     ceph_inode_has_xattr(ci, CEPH_XATTR_NAME_ENCRYPTION_CONTEXT)))
+			inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
 	}
 
 	/* finally update i_version */
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index cf04fcd3de69..7c859824f64c 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -986,6 +986,7 @@ extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
 extern struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci);
 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 extern const struct xattr_handler *ceph_xattr_handlers[];
+bool ceph_inode_has_xattr(struct ceph_inode_info *ci, char *name);
 
 struct ceph_acl_sec_ctx {
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 3a733ac33d9b..9dcb060cba9a 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -1283,6 +1283,38 @@ void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
 		ceph_pagelist_release(as_ctx->pagelist);
 }
 
+/* Return true if inode's xattr blob has an xattr named "name" */
+bool ceph_inode_has_xattr(struct ceph_inode_info *ci, char *name)
+{
+	void *p, *end;
+	u32 numattr;
+	size_t namelen;
+
+	lockdep_assert_held(&ci->i_ceph_lock);
+
+	if (!ci->i_xattrs.blob || ci->i_xattrs.blob->vec.iov_len <= 4)
+		return false;
+
+	namelen = strlen(name);
+	p = ci->i_xattrs.blob->vec.iov_base;
+	end = p + ci->i_xattrs.blob->vec.iov_len;
+	ceph_decode_32_safe(&p, end, numattr, bad);
+
+	while (numattr--) {
+		u32 len;
+
+		ceph_decode_32_safe(&p, end, len, bad);
+		ceph_decode_need(&p, end, len, bad);
+		if (len == namelen && !memcmp(p, name, len))
+			return true;
+		p += len;
+		ceph_decode_32_safe(&p, end, len, bad);
+		ceph_decode_skip_n(&p, end, len, bad);
+	}
+bad:
+	return false;
+}
+
 /*
  * List of handlers for synthetic system.* attributes. Other
  * attributes are handled directly.
-- 
2.26.2


  parent reply index

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 ` [RFC PATCH v2 04/18] fscrypt: add fscrypt_new_context_from_inode Jeff Layton
2020-09-08  3:48   ` 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 ` Jeff Layton [this message]
2020-09-08  4:57   ` [RFC PATCH v2 12/18] ceph: set S_ENCRYPTED bit if new inode has encryption.ctx xattr 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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