[PATCH] f2fs: invalidate inode and data pages if inode is no longer used

[Jaegeuk Kim]

When a file is closed, let's deactivate inode page to mitigate further memory
pressure. We can do data pages as well in the corner case of f2fs_drop_inode.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/file.c  | 4 ++++
 fs/f2fs/super.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index e460211..5f9a6dc 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1465,6 +1465,10 @@ static int f2fs_release_file(struct inode *inode, struct file *filp)
 		filemap_fdatawrite(inode->i_mapping);
 		clear_inode_flag(inode, FI_DROP_CACHE);
 	}
+
+	/* deactivate written inode page */
+	invalidate_mapping_pages(NODE_MAPPING(F2FS_I_SB(inode)),
+					inode->i_ino, inode->i_ino);
 	return 0;
 }
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 7f863a6..f84696d 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -618,6 +618,7 @@ static int f2fs_drop_inode(struct inode *inode)
 			sb_end_intwrite(inode->i_sb);
 
 			fscrypt_put_encryption_info(inode, NULL);
+			invalidate_mapping_pages(inode->i_mapping, 0, -1);
 			spin_lock(&inode->i_lock);
 			atomic_dec(&inode->i_count);
 		}
-- 
2.8.3