Memfds are identified by their underlying inode. Implement get_id for memfd_luo to return the inode pointer. This prevents the same memfd from being managed twice by LUO if the same inode is pointed by multiple file objects.
Signed-off-by: Pasha Tatashin <[email protected]> --- mm/memfd_luo.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index b8edb9f981d7..6629ab4d8e30 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -529,6 +529,11 @@ static bool memfd_luo_can_preserve(struct liveupdate_file_handler *handler, return shmem_file(file) && !inode->i_nlink; } +static unsigned long memfd_luo_get_id(struct file *file) +{ + return (unsigned long)file_inode(file); +} + static const struct liveupdate_file_ops memfd_luo_file_ops = { .freeze = memfd_luo_freeze, .finish = memfd_luo_finish, @@ -536,6 +541,7 @@ static const struct liveupdate_file_ops memfd_luo_file_ops = { .preserve = memfd_luo_preserve, .unpreserve = memfd_luo_unpreserve, .can_preserve = memfd_luo_can_preserve, + .get_id = memfd_luo_get_id, .owner = THIS_MODULE, }; -- 2.43.0
