[PATCH 2/5] f2fs: disable extent_cache for fcollapse/finsert inodes

[Jaegeuk Kim]

This reduces the elapsed time to do xfstests/generic/017.

Before: 458 s
After:  390 s

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/extent_cache.c | 13 +++++++++++++
 fs/f2fs/f2fs.h         |  1 +
 fs/f2fs/file.c         |  5 +++++
 3 files changed, 19 insertions(+)

diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 5b4b6d4..2b06d4f 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -631,6 +631,19 @@ unsigned int f2fs_destroy_extent_node(struct inode *inode)
        return node_cnt;
 }
 
+void f2fs_drop_extent_tree(struct inode *inode)
+{
+       struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+       struct extent_tree *et = F2FS_I(inode)->extent_tree;
+
+       set_inode_flag(inode, FI_NO_EXTENT);
+
+       write_lock(&et->lock);
+       __free_extent_tree(sbi, et);
+       __drop_largest_extent(inode, 0, UINT_MAX);
+       write_unlock(&et->lock);
+}
+
 void f2fs_destroy_extent_tree(struct inode *inode)
 {
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1190c04..2b8bf50 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2317,6 +2317,7 @@ void f2fs_leave_shrinker(struct f2fs_sb_info *);
  */
 unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *, int);
 bool f2fs_init_extent_tree(struct inode *, struct f2fs_extent *);
+void f2fs_drop_extent_tree(struct inode *);
 unsigned int f2fs_destroy_extent_node(struct inode *);
 void f2fs_destroy_extent_tree(struct inode *);
 bool f2fs_lookup_extent_cache(struct inode *, pgoff_t, struct extent_info *);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 0d4f1dd..dd399b3 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1083,6 +1083,9 @@ static int f2fs_do_collapse(struct inode *inode, pgoff_t 
start, pgoff_t end)
 
        f2fs_balance_fs(sbi, true);
        f2fs_lock_op(sbi);
+
+       f2fs_drop_extent_tree(inode);
+
        ret = __exchange_data_block(inode, inode, end, start, nrpages - end, 
true);
        f2fs_unlock_op(sbi);
        return ret;
@@ -1317,6 +1320,8 @@ static int f2fs_insert_range(struct inode *inode, loff_t 
offset, loff_t len)
                idx -= nr;
 
                f2fs_lock_op(sbi);
+               f2fs_drop_extent_tree(inode);
+
                ret = __exchange_data_block(inode, inode, idx,
                                        idx + delta, nr, false);
                f2fs_unlock_op(sbi);
-- 
2.8.3