[PATCH 6.6.y 3/4] f2fs: drop inode from the donation list when the last file is closed

[Sasha Levin <sashal@kernel.org>]

From: Jaegeuk Kim <jaegeuk@kernel.org>

[ Upstream commit 078cad8212ce4f4ebbafcc0936475b8215e1ca2a ]

Let's drop the inode from the donation list when there is no other
open file.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Stable-dep-of: 10b591e7fb7c ("f2fs: fix to avoid updating compression context during writeback")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/f2fs.h  | 2 ++
 fs/f2fs/file.c  | 8 +++++++-
 fs/f2fs/inode.c | 2 +-
 fs/f2fs/super.c | 1 +
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 460c29f95c17..4b295671df8b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -835,6 +835,7 @@ struct f2fs_inode_info {
 	/* linked in global inode list for cache donation */
 	struct list_head gdonate_list;
 	pgoff_t donate_start, donate_end; /* inclusive */
+	atomic_t open_count;		/* # of open files */
 
 	struct task_struct *atomic_write_task;	/* store atomic write task */
 	struct extent_tree *extent_tree[NR_EXTENT_CACHES];
@@ -3554,6 +3555,7 @@ int f2fs_try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink);
 void f2fs_update_inode(struct inode *inode, struct page *node_page);
 void f2fs_update_inode_page(struct inode *inode);
 int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc);
+void f2fs_remove_donate_inode(struct inode *inode);
 void f2fs_evict_inode(struct inode *inode);
 void f2fs_handle_failed_inode(struct inode *inode);
 
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 564d83e67043..7bdf0da5ba69 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -621,7 +621,10 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
 	if (err)
 		return err;
 
-	return finish_preallocate_blocks(inode);
+	err = finish_preallocate_blocks(inode);
+	if (!err)
+		atomic_inc(&F2FS_I(inode)->open_count);
+	return err;
 }
 
 void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
@@ -1963,6 +1966,9 @@ static long f2fs_fallocate(struct file *file, int mode,
 
 static int f2fs_release_file(struct inode *inode, struct file *filp)
 {
+	if (atomic_dec_and_test(&F2FS_I(inode)->open_count))
+		f2fs_remove_donate_inode(inode);
+
 	/*
 	 * f2fs_release_file is called at every close calls. So we should
 	 * not drop any inmemory pages by close called by other process.
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 7a961672737e..4ba5642148b5 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -811,7 +811,7 @@ int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 	return 0;
 }
 
-static void f2fs_remove_donate_inode(struct inode *inode)
+void f2fs_remove_donate_inode(struct inode *inode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ffff81caa244..0523e21fa951 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1409,6 +1409,7 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
 	/* Initialize f2fs-specific inode info */
 	atomic_set(&fi->dirty_pages, 0);
 	atomic_set(&fi->i_compr_blocks, 0);
+	atomic_set(&fi->open_count, 0);
 	init_f2fs_rwsem(&fi->i_sem);
 	spin_lock_init(&fi->i_size_lock);
 	INIT_LIST_HEAD(&fi->dirty_list);
-- 
2.51.0