linux-ext4 - [PATCH v8 04/20] fscrypt: add ->ci_inode to fscrypt

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Message-Id: <20190805162521.90882-5-ebiggers@kernel.org>
Date:   Mon,  5 Aug 2019 09:25:05 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-fscrypt@...r.kernel.org
Cc:     linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-crypto@...r.kernel.org, keyrings@...r.kernel.org,
        linux-api@...r.kernel.org, Satya Tangirala <satyat@...gle.com>,
        Paul Crowley <paulcrowley@...gle.com>,
        Theodore Ts'o <tytso@....edu>, Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH v8 04/20] fscrypt: add ->ci_inode to fscrypt_info

From: Eric Biggers <ebiggers@...gle.com>

Add an inode back-pointer to 'struct fscrypt_info', such that
inode->i_crypt_info->ci_inode == inode.

This will be useful for:

1. Evicting the inodes when a fscrypt key is removed, since we'll track
   the inodes using a given key by linking their fscrypt_infos together,
   rather than the inodes directly.  This avoids bloating 'struct inode'
   with a new list_head.

2. Simplifying the per-file key setup, since the inode pointer won't
   have to be passed around everywhere just in case something goes wrong
   and it's needed for fscrypt_warn().

Reviewed-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/crypto/fscrypt_private.h | 3 +++
 fs/crypto/keyinfo.c         | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index fae411b2f78dcb..d345a7d28df8c2 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -73,6 +73,9 @@ struct fscrypt_info {
 	 */
 	struct fscrypt_mode *ci_mode;
 
+	/* Back-pointer to the inode */
+	struct inode *ci_inode;
+
 	/*
 	 * If non-NULL, then this inode uses a master key directly rather than a
 	 * derived key, and ci_ctfm will equal ci_master_key->mk_ctfm.
diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 22345ddede1199..2d45a86f09db25 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -556,6 +556,8 @@ int fscrypt_get_encryption_info(struct inode *inode)
 	if (!crypt_info)
 		return -ENOMEM;
 
+	crypt_info->ci_inode = inode;
+
 	crypt_info->ci_flags = ctx.flags;
 	crypt_info->ci_data_mode = ctx.contents_encryption_mode;
 	crypt_info->ci_filename_mode = ctx.filenames_encryption_mode;
-- 
2.22.0.770.g0f2c4a37fd-goog