From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753455AbdK2Ih7 (ORCPT ); Wed, 29 Nov 2017 03:37:59 -0500 Received: from victor.provo.novell.com ([137.65.250.26]:57985 "EHLO prv3-mh.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753344AbdK2Ihd (ORCPT ); Wed, 29 Nov 2017 03:37:33 -0500 From: Gang He To: mfasheh@versity.com, jlbec@evilplan.org, rgoldwyn@suse.com, hch@lst.de Cc: Gang He , linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com, akpm@linux-foundation.org Subject: [PATCH v2 2/3] ocfs2: add ocfs2_overwrite_io function Date: Wed, 29 Nov 2017 16:36:51 +0800 Message-Id: <1511944612-9629-3-git-send-email-ghe@suse.com> X-Mailer: git-send-email 1.8.5.6 In-Reply-To: <1511944612-9629-1-git-send-email-ghe@suse.com> References: <1511944612-9629-1-git-send-email-ghe@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add ocfs2_overwrite_io function, which is used to judge if overwrite allocated blocks, otherwise, the write will bring extra block allocation overhead. Signed-off-by: Gang He --- fs/ocfs2/extent_map.c | 41 +++++++++++++++++++++++++++++++++++++++++ fs/ocfs2/extent_map.h | 3 +++ 2 files changed, 44 insertions(+) diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c index e4719e0..4da33e9 100644 --- a/fs/ocfs2/extent_map.c +++ b/fs/ocfs2/extent_map.c @@ -832,6 +832,47 @@ int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, return ret; } +/* Is IO overwriting allocated blocks? */ +int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, + u64 map_start, u64 map_len) +{ + int ret = 0, is_last; + u32 mapping_end, cpos; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_extent_rec rec; + + if ((OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) && + ((map_start + map_len) <= i_size_read(inode))) + goto out; + + cpos = map_start >> osb->s_clustersize_bits; + mapping_end = ocfs2_clusters_for_bytes(inode->i_sb, + map_start + map_len); + is_last = 0; + while (cpos < mapping_end && !is_last) { + ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos, + NULL, &rec, &is_last); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (rec.e_blkno == 0ULL) + break; + + if (rec.e_flags & OCFS2_EXT_REFCOUNTED) + break; + + cpos = le32_to_cpu(rec.e_cpos) + + le16_to_cpu(rec.e_leaf_clusters); + } + + if (cpos < mapping_end) + ret = -EAGAIN; +out: + return ret; +} + int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int whence) { struct inode *inode = file->f_mapping->host; diff --git a/fs/ocfs2/extent_map.h b/fs/ocfs2/extent_map.h index 67ea57d..1057586 100644 --- a/fs/ocfs2/extent_map.h +++ b/fs/ocfs2/extent_map.h @@ -53,6 +53,9 @@ int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno, int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 map_start, u64 map_len); +int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, + u64 map_start, u64 map_len); + int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin); int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster, -- 1.8.5.6