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Message-id: <007b01d0a25b$ff2a99d0$fd7fcd70$@samsung.com>
Date: Tue, 09 Jun 2015 10:27:39 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>,
Changman Lee <cm224.lee@...sung.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] f2fs: do not trim preallocated blocks when truncating after
i_size
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 <chao2.yu@...sung.com>
---
v2:
* adjust code style pointed out by Jaegeuk Kim.
fs/f2fs/file.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4d42d66..ec47c4a 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -651,16 +651,15 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
f2fs_get_encryption_info(inode))
return -EACCES;
- if (attr->ia_size != i_size_read(inode)) {
- truncate_setsize(inode, attr->ia_size);
+ truncate_setsize(inode, attr->ia_size);
+
+ /*
+ * do not trim all preallocated blocks after i_size if target
+ * size is larger than i_size.
+ */
+ if (attr->ia_size <= i_size_read(inode)) {
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.
- */
- f2fs_truncate(inode);
}
}
--
2.4.2
--
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