[PATCH 6.12 496/567] f2fs: drop inode from the donation list when the last file is closed

Greg Kroah-Hartman
2026-01-06T17:43:30Z

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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(-)

--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -859,6 +859,7 @@ 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];
@@ -3600,6 +3601,7 @@ int f2fs_try_to_free_nats(struct f2fs_sb
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);

--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -631,7 +631,10 @@ static int f2fs_file_open(struct inode *
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)
@@ -1992,6 +1995,9 @@ out:

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.
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -807,7 +807,7 @@ int f2fs_write_inode(struct inode *inode
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);

--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1425,6 +1425,7 @@ static struct inode *f2fs_alloc_inode(st
/* 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);