X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fllite%2Fcrypto.c;h=cc80aea8cfbd3ec1641aa944cb59ff10f683c37f;hb=fdbf2ffd41fa5660782d5ca8489ec2eb644c8113;hp=89917c71a553d31a713918b707dff77dcaf56e95;hpb=ed4a625d88567a2498c3fe32fd340ae7985e6ad0;p=fs%2Flustre-release.git

diff --git a/lustre/llite/crypto.c b/lustre/llite/crypto.c
index 89917c7..cc80aea 100644
--- a/lustre/llite/crypto.c
+++ b/lustre/llite/crypto.c
@@ -34,10 +34,26 @@
 static int ll_get_context(struct inode *inode, void *ctx, size_t len)
 {
 	struct dentry *dentry = d_find_any_alias(inode);
+	struct lu_env *env;
+	__u16 refcheck;
 	int rc;
 
+	env = cl_env_get(&refcheck);
+	if (IS_ERR(env))
+		return PTR_ERR(env);
+
+	/* Set lcc_getencctx=1 to allow this thread to read
+	 * LL_XATTR_NAME_ENCRYPTION_CONTEXT xattr, as requested by llcrypt.
+	 */
+	ll_cl_add(inode, env, NULL, LCC_RW);
+	ll_env_info(env)->lti_io_ctx.lcc_getencctx = 1;
+
 	rc = ll_vfs_getxattr(dentry, inode, LL_XATTR_NAME_ENCRYPTION_CONTEXT,
 			     ctx, len);
+
+	ll_cl_remove(inode, env);
+	cl_env_put(env, &refcheck);
+
 	if (dentry)
 		dput(dentry);
 
@@ -115,6 +131,34 @@ static int ll_set_context(struct inode *inode, const void *ctx, size_t len,
 	return ll_set_encflags(inode, (void *)ctx, len, false);
 }
 
+/**
+ * ll_file_open_encrypt() - overlay to llcrypt_file_open
+ * @inode: the inode being opened
+ * @filp: the struct file being set up
+ *
+ * This overlay function is necessary to handle encrypted file open without
+ * the key. We allow this access pattern to applications that know what they
+ * are doing, by using the specific flag O_FILE_ENC.
+ * This flag is only compatible with O_DIRECT IOs, to make sure ciphertext
+ * data is wiped from page cache once IOs are finished.
+ */
+int ll_file_open_encrypt(struct inode *inode, struct file *filp)
+{
+	int rc;
+
+	rc = llcrypt_file_open(inode, filp);
+	if (likely(rc != -ENOKEY))
+		return rc;
+
+	if (rc == -ENOKEY &&
+	    (filp->f_flags & O_FILE_ENC) == O_FILE_ENC &&
+	    filp->f_flags & O_DIRECT)
+		/* allow file open with O_FILE_ENC flag when we have O_DIRECT */
+		rc = 0;
+
+	return rc;
+}
+
 void llcrypt_free_ctx(void *encctx, __u32 size)
 {
 	if (encctx)
@@ -123,7 +167,7 @@ void llcrypt_free_ctx(void *encctx, __u32 size)
 
 bool ll_sbi_has_test_dummy_encryption(struct ll_sb_info *sbi)
 {
-	return unlikely(sbi->ll_flags & LL_SBI_TEST_DUMMY_ENCRYPTION);
+	return unlikely(test_bit(LL_SBI_TEST_DUMMY_ENCRYPTION, sbi->ll_flags));
 }
 
 static bool ll_dummy_context(struct inode *inode)
@@ -135,16 +179,17 @@ static bool ll_dummy_context(struct inode *inode)
 
 bool ll_sbi_has_encrypt(struct ll_sb_info *sbi)
 {
-	return sbi->ll_flags & LL_SBI_ENCRYPT;
+	return test_bit(LL_SBI_ENCRYPT, sbi->ll_flags);
 }
 
 void ll_sbi_set_encrypt(struct ll_sb_info *sbi, bool set)
 {
-	if (set)
-		sbi->ll_flags |= LL_SBI_ENCRYPT;
-	else
-		sbi->ll_flags &=
-			~(LL_SBI_ENCRYPT | LL_SBI_TEST_DUMMY_ENCRYPTION);
+	if (set) {
+		set_bit(LL_SBI_ENCRYPT, sbi->ll_flags);
+	} else {
+		clear_bit(LL_SBI_ENCRYPT, sbi->ll_flags);
+		clear_bit(LL_SBI_TEST_DUMMY_ENCRYPTION, sbi->ll_flags);
+	}
 }
 
 static bool ll_empty_dir(struct inode *inode)
@@ -201,6 +246,17 @@ int ll_setup_filename(struct inode *dir, const struct qstr *iname,
 		fid->f_ver = 0;
 	}
 	rc = llcrypt_setup_filename(dir, &dname, lookup, fname);
+	if (rc == -ENOENT && lookup &&
+	    !llcrypt_has_encryption_key(dir) &&
+	    unlikely(filename_is_volatile(iname->name, iname->len, NULL))) {
+		/* For purpose of migration or mirroring without enc key, we
+		 * allow lookup of volatile file without enc context.
+		 */
+		memset(fname, 0, sizeof(struct llcrypt_name));
+		fname->disk_name.name = (unsigned char *)iname->name;
+		fname->disk_name.len = iname->len;
+		rc = 0;
+	}
 	if (rc)
 		return rc;
 
@@ -401,6 +457,11 @@ int ll_set_encflags(struct inode *inode, void *encctx, __u32 encctxlen,
 	return 0;
 }
 
+int ll_file_open_encrypt(struct inode *inode, struct file *filp)
+{
+	return llcrypt_file_open(inode, filp);
+}
+
 void llcrypt_free_ctx(void *encctx, __u32 size)
 {
 }