diff options
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 23fb033e596d..cbbc13774819 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -826,6 +826,11 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long vmpglen; + /* suppress VMA sharing for shared regions */ + if (vm_flags & VM_SHARED && + capabilities & BDI_CAP_MAP_DIRECT) + goto dont_share_VMAs; + for (rb = rb_first(&nommu_vma_tree); rb; rb = rb_next(rb)) { vma = rb_entry(rb, struct vm_area_struct, vm_rb); @@ -859,6 +864,7 @@ unsigned long do_mmap_pgoff(struct file *file, goto shared; } + dont_share_VMAs: vma = NULL; /* obtain the address at which to make a shared mapping @@ -1193,6 +1199,28 @@ void unmap_mapping_range(struct address_space *mapping, EXPORT_SYMBOL(unmap_mapping_range); /* + * ask for an unmapped area at which to create a mapping on a file + */ +unsigned long get_unmapped_area(struct file *file, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + unsigned long (*get_area)(struct file *, unsigned long, unsigned long, + unsigned long, unsigned long); + + get_area = current->mm->get_unmapped_area; + if (file && file->f_op && file->f_op->get_unmapped_area) + get_area = file->f_op->get_unmapped_area; + + if (!get_area) + return -ENOSYS; + + return get_area(file, addr, len, pgoff, flags); +} + +EXPORT_SYMBOL(get_unmapped_area); + +/* * Check that a process has enough memory to allocate a new virtual * mapping. 0 means there is enough memory for the allocation to * succeed and -ENOMEM implies there is not. |