From: Chao Yu <yuch...@huawei.com>
[ Upstream commit 46085f37fc9e12d5c3539fb768b5ad7951e72acf ]
fsstress + fault injection test case reports a warning message as
below:
WARNING: CPU: 13 PID: 6226 at fs/inode.c:361 inc_nlink+0x32/0x40
Call Trace:
f2fs_init_inode_metadata+0x25c/0x4a0 [f2fs]
f2fs_add_inline_entry+0x153/0x3b0 [f2fs]
f2fs_add_dentry+0x75/0x80 [f2fs]
f2fs_do_add_link+0x108/0x160 [f2fs]
f2fs_rename2+0x6ab/0x14f0 [f2fs]
vfs_rename+0x70c/0x940
do_renameat2+0x4d8/0x4f0
__x64_sys_renameat2+0x4b/0x60
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Following race case can cause this:
Thread A Kworker
- f2fs_rename
- f2fs_create_whiteout
- __f2fs_tmpfile
- f2fs_i_links_write
- f2fs_mark_inode_dirty_sync
- mark_inode_dirty_sync
- writeback_single_inode
- __writeback_single_inode
- spin_lock(&inode->i_lock)
- inode->i_state |= I_LINKABLE
- inode->i_state &= ~dirty
- spin_unlock(&inode->i_lock)
- f2fs_add_link
- f2fs_do_add_link
- f2fs_add_dentry
- f2fs_add_inline_entry
- f2fs_init_inode_metadata
- f2fs_i_links_write
- inc_nlink
- WARN_ON(!(inode->i_state & I_LINKABLE))
Fix to add i_lock to avoid i_state update race condition.
Signed-off-by: Chao Yu <yuch...@huawei.com>
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
fs/f2fs/namei.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 8617e742d087..e20a0f9e6845 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -772,7 +772,11 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry
*dentry,
if (whiteout) {
f2fs_i_links_write(inode, false);
+
+ spin_lock(&inode->i_lock);
inode->i_state |= I_LINKABLE;
+ spin_unlock(&inode->i_lock);
+
*whiteout = inode;
} else {
d_tmpfile(dentry, inode);
@@ -966,7 +970,11 @@ static int f2fs_rename(struct inode *old_dir, struct
dentry *old_dentry,
err = f2fs_add_link(old_dentry, whiteout);
if (err)
goto put_out_dir;
+
+ spin_lock(&whiteout->i_lock);
whiteout->i_state &= ~I_LINKABLE;
+ spin_unlock(&whiteout->i_lock);
+
iput(whiteout);
}
--
2.30.1
