f2fs: don't keep meta pages used for block migration

For migration of encrypted inode's block, we load data of encrypted block
into meta inode's page cache, after checkpoint, those all intermediate
pages should be clean, and no one will read them again, so let's just
release them for more memory.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index f3fabf992727a7d61e83b0175557776ae5262738..3c3429a99475cde7d6eb406f7cd29f92f2cdc6f9 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1408,6 +1408,14 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
        commit_checkpoint(sbi, ckpt, start_blk);
        wait_on_all_pages_writeback(sbi);
 
+       /*
+        * invalidate intermediate page cache borrowed from meta inode
+        * which are used for migration of encrypted inode's blocks.
+        */
+       if (f2fs_sb_has_encrypt(sbi->sb))
+               invalidate_mapping_pages(META_MAPPING(sbi),
+                               MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
+
        f2fs_release_ino_entry(sbi, false);
 
        clear_sbi_flag(sbi, SBI_IS_DIRTY);