mm, dax: use i_mmap_unlock_write() in do_cow_fault() (52a2b53f) · Commits · 戴 / test

__dax_fault() takes i_mmap_lock for write. Let's pair it with write unlock on do_cow_fault() side. Signed-off-by:

mm/memory.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -3013,9 +3013,9 @@ static int do_cow_fault(struct mm_struct mm, struct vm_area_struct vma,
		} else {
		/*
		* The fault handler has no page to lock, so it holds
		* i_mmap_lock for read to protect against truncate.
		* i_mmap_lock for write to protect against truncate.
		*/
		i_mmap_unlock_read(vma->vm_file->f_mapping);
		i_mmap_unlock_write(vma->vm_file->f_mapping);
		}
		goto uncharge_out;
		}
		@@ -3029,9 +3029,9 @@ static int do_cow_fault(struct mm_struct mm, struct vm_area_struct vma,
		} else {
		/*
		* The fault handler has no page to lock, so it holds
		* i_mmap_lock for read to protect against truncate.
		* i_mmap_lock for write to protect against truncate.
		*/
		i_mmap_unlock_read(vma->vm_file->f_mapping);
		i_mmap_unlock_write(vma->vm_file->f_mapping);
		}
		return ret;
		uncharge_out: