From: Chandan Rajendra Subject: [RFC PATCH V2 02/11] fs/buffer.c: Export end_buffer_async_read and create_page_buffers Date: Mon, 12 Feb 2018 15:13:38 +0530 Message-ID: <20180212094347.22071-3-chandan@linux.vnet.ibm.com> References: <20180212094347.22071-1-chandan@linux.vnet.ibm.com> Cc: Chandan Rajendra , linux-fsdevel@vger.kernel.org, ebiggers3@gmail.com, linux-fscrypt@vger.kernel.org, tytso@mit.edu To: linux-ext4@vger.kernel.org Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:47634 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753950AbeBLJmh (ORCPT ); Mon, 12 Feb 2018 04:42:37 -0500 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w1C9eLXP121459 for ; Mon, 12 Feb 2018 04:42:37 -0500 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0a-001b2d01.pphosted.com with ESMTP id 2g31etntqs-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 12 Feb 2018 04:42:36 -0500 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 12 Feb 2018 02:42:36 -0700 In-Reply-To: <20180212094347.22071-1-chandan@linux.vnet.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: The functions end_buffer_async_read() and create_page_buffers() will be required by the fscrypt module to implement decrypting encrypted blocks that have been read from the filesystem. Signed-off-by: Chandan Rajendra --- fs/buffer.c | 6 ++++-- include/linux/buffer_head.h | 3 +++ 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 551b781..663180d 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -256,7 +256,7 @@ __find_get_block_slow(struct block_device *bdev, sector_t block) * I/O completion handler for block_read_full_page() - pages * which come unlocked at the end of I/O. */ -static void end_buffer_async_read(struct buffer_head *bh, int uptodate) +void end_buffer_async_read(struct buffer_head *bh, int uptodate) { unsigned long flags; struct buffer_head *first; @@ -312,6 +312,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate) local_irq_restore(flags); return; } +EXPORT_SYMBOL(end_buffer_async_read); /* * Completion handler for block_write_full_page() - pages which are unlocked @@ -1647,7 +1648,7 @@ static inline int block_size_bits(unsigned int blocksize) return ilog2(blocksize); } -static struct buffer_head *create_page_buffers(struct page *page, struct inode *inode, unsigned int b_state) +struct buffer_head *create_page_buffers(struct page *page, struct inode *inode, unsigned int b_state) { BUG_ON(!PageLocked(page)); @@ -1656,6 +1657,7 @@ static struct buffer_head *create_page_buffers(struct page *page, struct inode * b_state); return page_buffers(page); } +EXPORT_SYMBOL(create_page_buffers); /* * NOTE! All mapped/uptodate combinations are valid: diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index f1aed01..edc0983 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -161,7 +161,10 @@ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, bool retry); void create_empty_buffers(struct page *, unsigned long, unsigned long b_state); +struct buffer_head *create_page_buffers(struct page *page, struct inode *inode, + unsigned int b_state); void end_buffer_read_sync(struct buffer_head *bh, int uptodate); +void end_buffer_async_read(struct buffer_head *bh, int uptodate); void end_buffer_write_sync(struct buffer_head *bh, int uptodate); void end_buffer_async_write(struct buffer_head *bh, int uptodate); -- 2.9.5