VM: add "vm_mmap()" helper function

This continues the theme started with vm_brk() and vm_munmap():
vm_mmap() does the same thing as do_mmap(), but additionally does the
required VM locking.

This uninlines (and rewrites it to be clearer) do_mmap(), which sadly
duplicates it in mm/mmap.c and mm/nommu.c.  But that way we don't have
to export our internal do_mmap_pgoff() function.

Some day we hopefully don't have to export do_mmap() either, if all
modular users can become the simpler vm_mmap() instead.  We're actually
very close to that already, with the notable exception of the (broken)
use in i810, and a couple of stragglers in binfmt_elf.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 27 insertions, 2 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index 11a69b22bd4b..dd00383be2d9 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1233,7 +1233,7 @@ enomem:
 /*
  * handle mapping creation for uClinux
  */
-unsigned long do_mmap_pgoff(struct file *file,
+static unsigned long do_mmap_pgoff(struct file *file,
                             unsigned long addr,
                             unsigned long len,
                             unsigned long prot,
@@ -1470,7 +1470,32 @@ error_getting_region:
         show_free_areas(0);
         return -ENOMEM;
 }
-EXPORT_SYMBOL(do_mmap_pgoff);
+
+unsigned long do_mmap(struct file *file, unsigned long addr,
+        unsigned long len, unsigned long prot,
+        unsigned long flag, unsigned long offset)
+{
+        if (unlikely(offset + PAGE_ALIGN(len) < offset))
+                return -EINVAL;
+        if (unlikely(offset & ~PAGE_MASK))
+                return -EINVAL;
+        return do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
+}
+EXPORT_SYMBOL(do_mmap);
+
+unsigned long vm_mmap(struct file *file, unsigned long addr,
+        unsigned long len, unsigned long prot,
+        unsigned long flag, unsigned long offset)
+{
+        unsigned long ret;
+        struct mm_struct *mm = current->mm;
+
+        down_write(&mm->mmap_sem);
+        ret = do_mmap(file, addr, len, prot, flag, offset);
+        up_write(&mm->mmap_sem);
+        return ret;
+}
+EXPORT_SYMBOL(vm_mmap);
 
 SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
                 unsigned long, prot, unsigned long, flags,