android-5.4/FROMLIST-f2fs-add-support-for-IV_INO_LBLK_64-encryption-policies.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Thu, 24 Oct 2019 14:43:37 -0700
Subject: FROMLIST: f2fs: add support for IV_INO_LBLK_64 encryption policies

f2fs inode numbers are stable across filesystem resizing, and f2fs inode
and file logical block numbers are always 32-bit.  So f2fs can always
support IV_INO_LBLK_64 encryption policies.  Wire up the needed
fscrypt_operations to declare support.

Signed-off-by: Eric Biggers <ebiggers@google.com>

Change-Id: I15c9b0f277df106701c4aacdf9456dbb3f8876a1
Signed-off-by: Satya Tangirala <satyat@google.com>
Link: https://patchwork.kernel.org/patch/11210903/
---
 fs/f2fs/super.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 1443cee15863..851ac9522926 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2308,13 +2308,27 @@ static bool f2fs_dummy_context(struct inode *inode)
 	return DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(inode));
 }
 
+static bool f2fs_has_stable_inodes(struct super_block *sb)
+{
+	return true;
+}
+
+static void f2fs_get_ino_and_lblk_bits(struct super_block *sb,
+				       int *ino_bits_ret, int *lblk_bits_ret)
+{
+	*ino_bits_ret = 8 * sizeof(nid_t);
+	*lblk_bits_ret = 8 * sizeof(block_t);
+}
+
 static const struct fscrypt_operations f2fs_cryptops = {
-	.key_prefix	= "f2fs:",
-	.get_context	= f2fs_get_context,
-	.set_context	= f2fs_set_context,
-	.dummy_context	= f2fs_dummy_context,
-	.empty_dir	= f2fs_empty_dir,
-	.max_namelen	= F2FS_NAME_LEN,
+	.key_prefix		= "f2fs:",
+	.get_context		= f2fs_get_context,
+	.set_context		= f2fs_set_context,
+	.dummy_context		= f2fs_dummy_context,
+	.empty_dir		= f2fs_empty_dir,
+	.max_namelen		= F2FS_NAME_LEN,
+	.has_stable_inodes	= f2fs_has_stable_inodes,
+	.get_ino_and_lblk_bits	= f2fs_get_ino_and_lblk_bits,
 };
 #endif