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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 17:13:58 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 17:29:13 -0700 |
commit | 6be5ceb02e98eaf6cfc4f8b12a896d04023f340d (patch) | |
tree | f34de1392300bbf63549f4eeb20f7606d6f7b1f9 /include | |
parent | a46ef99d80817a167477ed1c8b4d90ee0c2e726f (diff) | |
download | linux-3.10-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.tar.gz linux-3.10-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.tar.bz2 linux-3.10-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.zip |
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>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/mm.h | 23 |
1 files changed, 6 insertions, 17 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index cb61950a3aa..86a692c3b23 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1393,31 +1393,20 @@ extern int install_special_mapping(struct mm_struct *mm, extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); -extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, - unsigned long len, unsigned long prot, - unsigned long flag, unsigned long pgoff); extern unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long len, unsigned long flags, vm_flags_t vm_flags, unsigned long pgoff); - -static inline unsigned long do_mmap(struct file *file, unsigned long addr, - unsigned long len, unsigned long prot, - unsigned long flag, unsigned long offset) -{ - unsigned long ret = -EINVAL; - if ((offset + PAGE_ALIGN(len)) < offset) - goto out; - if (!(offset & ~PAGE_MASK)) - ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); -out: - return ret; -} - +extern unsigned long do_mmap(struct file *, unsigned long, + unsigned long, unsigned long, + unsigned long, unsigned long); extern int do_munmap(struct mm_struct *, unsigned long, size_t); /* These take the mm semaphore themselves */ extern unsigned long vm_brk(unsigned long, unsigned long); extern int vm_munmap(struct mm_struct *, unsigned long, size_t); +extern unsigned long vm_mmap(struct file *, unsigned long, + unsigned long, unsigned long, + unsigned long, unsigned long); /* truncate.c */ extern void truncate_inode_pages(struct address_space *, loff_t); |