From: Chao Yu Subject: [PATCH] f2fs: do not trim preallocated blocks when truncating after i_size Date: Fri, 05 Jun 2015 18:34:02 +0800 Message-ID: <000101d09f7b$4a2559e0$de700da0$@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Content-language: zh-cn Sender: linux-kernel-owner@vger.kernel.org To: Jaegeuk Kim Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org List-Id: linux-f2fs-devel.lists.sourceforge.net When we perform generic/092 in xfstests, output is like below: XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 0: [0..10239]: data 0: [0..10239]: data -1: [10240..20479]: unwritten +1: [10240..14335]: unwritten This is because with this testcase, we redefine the regulation for truncate in perallocated space past i_size as below: "There was some confused about what the fs was supposed to do when you truncate at i_size with preallocated space past i_size. We decided on the following things. 1) truncate(i_size) will trim all blocks past i_size. 2) truncate(x) where x > i_size will not trim all blocks past i_size. " This method is used in xfs, and then ext4/btrfs will follow the rule. This patch fixes to follow the new rule for f2fs. Signed-off-by: Chao Yu --- fs/f2fs/file.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 4d42d66..85f97af 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -651,16 +651,16 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr) f2fs_get_encryption_info(inode)) return -EACCES; - if (attr->ia_size != i_size_read(inode)) { + if (attr->ia_size <= i_size_read(inode)) { truncate_setsize(inode, attr->ia_size); f2fs_truncate(inode); f2fs_balance_fs(F2FS_I_SB(inode)); } else { /* - * giving a chance to truncate blocks past EOF which - * are fallocated with FALLOC_FL_KEEP_SIZE. + * do not trim all blocks after i_size if target size is + * larger than i_size. */ - f2fs_truncate(inode); + truncate_setsize(inode, attr->ia_size); } } -- 2.4.2