diff options
Diffstat (limited to 'mm/vma.c')
| -rw-r--r-- | mm/vma.c | 11 |
1 files changed, 9 insertions, 2 deletions
@@ -37,6 +37,8 @@ struct mmap_state { bool check_ksm_early :1; /* If we map new, hold the file rmap lock on mapping. */ bool hold_file_rmap_lock :1; + /* If .mmap_prepare changed the file, we don't need to pin. */ + bool file_doesnt_need_get :1; }; #define MMAP_STATE(name, mm_, vmi_, addr_, len_, pgoff_, vm_flags_, file_) \ @@ -2450,7 +2452,9 @@ static int __mmap_new_file_vma(struct mmap_state *map, struct vma_iterator *vmi = map->vmi; int error; - vma->vm_file = get_file(map->file); + vma->vm_file = map->file; + if (!map->file_doesnt_need_get) + get_file(map->file); if (!map->file->f_op->mmap) return 0; @@ -2638,7 +2642,10 @@ static int call_mmap_prepare(struct mmap_state *map, /* Update fields permitted to be changed. */ map->pgoff = desc->pgoff; - map->file = desc->vm_file; + if (desc->vm_file != map->file) { + map->file_doesnt_need_get = true; + map->file = desc->vm_file; + } map->vm_flags = desc->vm_flags; map->page_prot = desc->page_prot; /* User-defined fields. */ |