linux-kernel - [PATCH 5/6] fscrypt: Deplay bounce page pool allocation until needed

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Message-Id: <1480630498-19201-6-git-send-email-richard@nod.at>
Date:   Thu,  1 Dec 2016 23:14:57 +0100
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     david@...ma-star.at, tytso@....edu, dedekind1@...il.com,
        ebiggers@...gle.com, mhalcrow@...gle.com, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, hch@...radead.org,
        linux-fsdevel@...r.kernel.org, jaegeuk@...nel.org,
        dengler@...utronix.de, sbabic@...x.de, wd@...x.de,
        Richard Weinberger <richard@....at>
Subject: [PATCH 5/6] fscrypt: Deplay bounce page pool allocation until needed

From: David Gstir <david@...ma-star.at>

Since fscrypt users can now indicated if fscrypt_encrypt_page() should
use a bounce page, we can delay the bounce page pool initialization util
it is really needed. That is until fscrypt_operations has no
FS_CFLG_OWN_PAGES flag set.

Signed-off-by: David Gstir <david@...ma-star.at>
Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/crypto/crypto.c       | 7 +++++--
 fs/crypto/keyinfo.c      | 2 +-
 include/linux/fscrypto.h | 2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index 2f41eee963e1..d694a3a93eb3 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -521,17 +521,20 @@ static void fscrypt_destroy(void)
 
 /**
  * fscrypt_initialize() - allocate major buffers for fs encryption.
+ * @cop_flags:  fscrypt operations flags
  *
  * We only call this when we start accessing encrypted files, since it
  * results in memory getting allocated that wouldn't otherwise be used.
  *
  * Return: Zero on success, non-zero otherwise.
  */
-int fscrypt_initialize(void)
+int fscrypt_initialize(unsigned int cop_flags)
 {
 	int i, res = -ENOMEM;
 
-	if (fscrypt_bounce_page_pool)
+	/* No need to allocate a bounce page pool if there already is one or
+	 * this FS won't use it. */
+	if (cop_flags & FS_CFLG_OWN_PAGES || fscrypt_bounce_page_pool)
 		return 0;
 
 	mutex_lock(&fscrypt_init_mutex);
diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 67fb6d8876d0..5951f4ebf2a9 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -188,7 +188,7 @@ int get_crypt_info(struct inode *inode)
 	u8 *raw_key = NULL;
 	int res;
 
-	res = fscrypt_initialize();
+	res = fscrypt_initialize(inode->i_sb->s_cop->flags);
 	if (res)
 		return res;
 
diff --git a/include/linux/fscrypto.h b/include/linux/fscrypto.h
index 65be74f3afb6..6f5c7e8fbd55 100644
--- a/include/linux/fscrypto.h
+++ b/include/linux/fscrypto.h
@@ -244,7 +244,7 @@ static inline void fscrypt_set_d_op(struct dentry *dentry)
 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
 /* crypto.c */
 extern struct kmem_cache *fscrypt_info_cachep;
-int fscrypt_initialize(void);
+int fscrypt_initialize(unsigned int);
 
 extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t);
 extern void fscrypt_release_ctx(struct fscrypt_ctx *);
-- 
2.7.3