From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaegeuk Kim Subject: [PATCH 2/3] f2fs: do not issue next dnode discard redundantly Date: Mon, 11 May 2015 20:48:47 -0700 Message-ID: <1431402528-24156-2-git-send-email-jaegeuk@kernel.org> References: <1431402528-24156-1-git-send-email-jaegeuk@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Return-path: In-Reply-To: <1431402528-24156-1-git-send-email-jaegeuk@kernel.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net List-Id: linux-fsdevel.vger.kernel.org We have a discard map, so that we can avoid redundant discard issues. Signed-off-by: Jaegeuk Kim --- fs/f2fs/segment.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 2c40ce1..342e0f7 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -486,7 +486,20 @@ static int f2fs_issue_discard(struct f2fs_sb_info *sbi, void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr) { - if (f2fs_issue_discard(sbi, blkaddr, 1)) { + int err = -ENOTSUPP; + + if (test_opt(sbi, DISCARD)) { + struct seg_entry *se = get_seg_entry(sbi, + GET_SEGNO(sbi, blkaddr)); + unsigned int offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr); + + if (f2fs_test_bit(offset, se->discard_map)) + return; + + err = f2fs_issue_discard(sbi, blkaddr, 1); + } + + if (err) { struct page *page = grab_meta_page(sbi, blkaddr); /* zero-filled page */ set_page_dirty(page); -- 2.1.1 ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y