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split mmap 

This is a straightforward split of do_mmap_pgoff() into two functions:

 - do_mmap_pgoff() checks the parameters, and calculates the vma
   flags.  Then it calls

 - mmap_region(), which does the actual mapping

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2007-07-15 23:38:26 -07:00 committed by Linus Torvalds
parent c44939ecb6
commit 0165ab4435
2 changed files with 23 additions and 6 deletions
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4
include/linux/mm.h
View File

@ -1071,6 +1071,10 @@ extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned lo
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,
unsigned int vm_flags, unsigned long pgoff,
int accountable);
static inline unsigned long do_mmap(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,

25
mm/mmap.c
View File

@ -894,14 +894,11 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
unsigned long flags, unsigned long pgoff)
{
struct mm_struct * mm = current->mm;
struct vm_area_struct * vma, * prev;
struct inode *inode;
unsigned int vm_flags;
int correct_wcount = 0;
int error;
struct rb_node ** rb_link, * rb_parent;
int accountable = 1;
unsigned long charged = 0, reqprot = prot;
unsigned long reqprot = prot;
/*
* Does the application expect PROT_READ to imply PROT_EXEC?
@ -1027,6 +1024,24 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
if (error)
return error;
return mmap_region(file, addr, len, flags, vm_flags, pgoff,
accountable);
}
EXPORT_SYMBOL(do_mmap_pgoff);
unsigned long mmap_region(struct file *file, unsigned long addr,
unsigned long len, unsigned long flags,
unsigned int vm_flags, unsigned long pgoff,
int accountable)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev;
int correct_wcount = 0;
int error;
struct rb_node **rb_link, *rb_parent;
unsigned long charged = 0;
struct inode *inode = file ? file->f_path.dentry->d_inode : NULL;
/* Clear old maps */
error = -ENOMEM;
munmap_back:
@ -1175,8 +1190,6 @@ unacct_error:
return error;
}
EXPORT_SYMBOL(do_mmap_pgoff);
/* Get an address range which is currently unmapped.
* For shmat() with addr=0.
*