From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f53.google.com ([74.125.83.53]:35592 "EHLO mail-pg0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751711AbdFODpY (ORCPT ); Wed, 14 Jun 2017 23:45:24 -0400 Received: by mail-pg0-f53.google.com with SMTP id k71so1640524pgd.2 for ; Wed, 14 Jun 2017 20:45:24 -0700 (PDT) From: Jens Axboe To: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org Cc: adilger@dilger.ca, hch@infradead.org, martin.petersen@oracle.com, Jens Axboe Subject: [PATCH 03/11] fs: add support for an inode to carry stream related data Date: Wed, 14 Jun 2017 21:45:04 -0600 Message-Id: <1497498312-17704-4-git-send-email-axboe@kernel.dk> In-Reply-To: <1497498312-17704-1-git-send-email-axboe@kernel.dk> References: <1497498312-17704-1-git-send-email-axboe@kernel.dk> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: No functional changes in this patch, just in preparation for allowing applications to pass in hints about data life times for writes. Pack the i_write_hint field into a 2-byte hole, so we don't grow the size of the inode. Reviewed-by: Andreas Dilger Signed-off-by: Jens Axboe --- fs/inode.c | 1 + include/linux/fs.h | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/fs/inode.c b/fs/inode.c index db5914783a71..bd8bf44f3f31 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -149,6 +149,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) inode->i_blocks = 0; inode->i_bytes = 0; inode->i_generation = 0; + inode->i_write_hint = 0; inode->i_pipe = NULL; inode->i_bdev = NULL; inode->i_cdev = NULL; diff --git a/include/linux/fs.h b/include/linux/fs.h index 803e5a9b2654..f4f9df8ed059 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -591,6 +591,7 @@ struct inode { struct timespec i_ctime; spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ unsigned short i_bytes; + unsigned short i_write_hint; unsigned int i_blkbits; blkcnt_t i_blocks; @@ -655,6 +656,14 @@ struct inode { void *i_private; /* fs or device private pointer */ }; +static inline unsigned int inode_write_hint(struct inode *inode) +{ + if (inode) + return inode->i_write_hint; + + return 0; +} + static inline unsigned int i_blocksize(const struct inode *node) { return (1 << node->i_blkbits); -- 2.7.4