If vma is shared and the file was opened for writing,
we should also create writeback fid because vma may be
mprotected writable even if now readonly.
Signed-off-by: Chengguang Xu <[email protected]>
---
fs/9p/vfs_file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index b177fd3b1eb3..e4256dbcb754 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -517,7 +517,7 @@ v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
mutex_lock(&v9inode->v_mutex);
if (!v9inode->writeback_fid &&
(vma->vm_flags & VM_SHARED) &&
- (vma->vm_flags & VM_WRITE)) {
+ (vma->vm_flags & VM_MAYWRITE)) {
/*
* clone a fid and add it to writeback_fid
* we do it during mmap instead of
--
2.26.2