[PATCH 1/2] f2fs: treat volatile file's data as hot one

[Chao Yu]

Volatile file's data will be updated oftenly, so it'd better to place
its data into hot data segment.

In addition, for atomic file, we change to check FI_ATOMIC_FILE instead
of FI_HOT_DATA to make code readability better.

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 fs/f2fs/file.c    | 2 --
 fs/f2fs/segment.c | 5 +++--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index e88d94846d50..05b2045888a3 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1700,7 +1700,6 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
        if (ret)
                goto out;
 skip_flush:
-       set_inode_flag(inode, FI_HOT_DATA);
        set_inode_flag(inode, FI_ATOMIC_FILE);
        clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
        f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
@@ -1744,7 +1743,6 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
                ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
                if (!ret) {
                        clear_inode_flag(inode, FI_ATOMIC_FILE);
-                       clear_inode_flag(inode, FI_HOT_DATA);
                        stat_dec_atomic_write(inode);
                }
        } else {
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1fc23572067d..e339a5ff381f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -314,7 +314,6 @@ void drop_inmem_pages(struct inode *inode)
        mutex_unlock(&fi->inmem_lock);
 
        clear_inode_flag(inode, FI_ATOMIC_FILE);
-       clear_inode_flag(inode, FI_HOT_DATA);
        stat_dec_atomic_write(inode);
 }
 
@@ -1637,7 +1636,9 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
                if (is_cold_data(fio->page) || file_is_cold(inode))
                        return CURSEG_COLD_DATA;
                if (file_is_hot(inode) ||
-                               is_inode_flag_set(inode, FI_HOT_DATA))
+                               is_inode_flag_set(inode, FI_HOT_DATA) ||
+                               is_inode_flag_set(inode, FI_ATOMIC_FILE) ||
+                               is_inode_flag_set(inode, FI_VOLATILE_FILE))
                        return CURSEG_HOT_DATA;
                return rw_hint_to_seg_type(inode->i_write_hint);
        } else {
-- 
2.15.0.55.gc2ece9dc4de6