[PATCH v2] f2fs: fix fdatasync

[Chao Yu]

For below two cases, we can't guarantee data consistence:

a)
1. xfs_io "pwrite 0 4195328" "fsync"
2. xfs_io "pwrite 4195328 1024" "fdatasync"
3. godown
4. umount & mount
--> isize we updated before fdatasync won't be recovered

b)
1. xfs_io "pwrite -S 0xcc 0 4202496" "fsync"
2. xfs_io "fpunch 4194304 4096" "fdatasync"
3. godown
4. umount & mount
--> dnode we punched before fdatasync won't be recovered

The reason is that normally fdatasync won't be aware of modification
of metadata in file, e.g. isize changing, dnode updating, so in ->fsync
we will skip flushing node pages for above cases, result in making
fdatasynced file being lost during recovery.

Currently we have introduced DIRTY_META global list in sbi for tracking
dirty inode selectively, so in fdatasync we can choose to flush nodes
depend on dirty state of current inode in the list.

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
 fs/f2fs/f2fs.h | 11 ++++++++++-
 fs/f2fs/file.c |  2 +-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index cf74ec6..4ddcf75 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1722,8 +1722,17 @@ static inline void f2fs_i_size_write(struct inode *inode, loff_t i_size)
 		set_inode_flag(inode, FI_AUTO_RECOVER);
 }
 
-static inline bool f2fs_skip_inode_update(struct inode *inode)
+static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
 {
+	if (dsync) {
+		struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+		bool ret;
+
+		spin_lock(&sbi->inode_lock[DIRTY_META]);
+		ret = list_empty(&F2FS_I(inode)->gdirty_list);
+		spin_unlock(&sbi->inode_lock[DIRTY_META]);
+		return ret;
+	}
 	if (!is_inode_flag_set(inode, FI_AUTO_RECOVER))
 		return false;
 	return F2FS_I(inode)->last_disk_size == i_size_read(inode);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 47b7b13..2957d1f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -210,7 +210,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
 	}
 
 	/* if the inode is dirty, let's recover all the time */
-	if (!datasync && !f2fs_skip_inode_update(inode)) {
+	if (!f2fs_skip_inode_update(inode, datasync)) {
 		f2fs_write_inode(inode, NULL);
 		goto go_write;
 	}
-- 
2.8.2.311.gee88674