[PATCH v13 35/59] ceph: add a new ceph.fscrypt.auth vxattr

Jeff Layton
2022-04-05T22:09:18Z

Give the client a way to get at the xattr from userland, mostly for
future debugging purposes.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/ceph/xattr.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 58628cef4207..e080116608b2 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -352,6 +352,23 @@ static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci,
return ret;
}

+#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
+static bool ceph_vxattrcb_fscrypt_auth_exists(struct ceph_inode_info *ci)
+{
+ return ci->fscrypt_auth_len;
+}
+
+static ssize_t ceph_vxattrcb_fscrypt_auth(struct ceph_inode_info *ci, char *val, size_t size)
+{
+ if (size) {
+ if (size < ci->fscrypt_auth_len)
+ return -ERANGE;
+ memcpy(val, ci->fscrypt_auth, ci->fscrypt_auth_len);
+ }
+ return ci->fscrypt_auth_len;
+}
+#endif /* CONFIG_FS_ENCRYPTION */
+
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
#define CEPH_XATTR_NAME2(_type, _name, _name2) \
XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@@ -500,6 +517,15 @@ static struct ceph_vxattr ceph_common_vxattrs[] = {
.exists_cb = NULL,
.flags = VXATTR_FLAG_READONLY,
},
+#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
+ {
+ .name = "ceph.fscrypt.auth",
+ .name_size = sizeof("ceph.fscrypt.auth"),
+ .getxattr_cb = ceph_vxattrcb_fscrypt_auth,
+ .exists_cb = ceph_vxattrcb_fscrypt_auth_exists,
+ .flags = VXATTR_FLAG_READONLY,
+ },
+#endif /* CONFIG_FS_ENCRYPTION */
{ .name = NULL, 0 } /* Required table terminator */
};

--
2.35.1