Commit eb36c587 authored by Al Viro's avatar Al Viro
Browse files

new helper: vm_mmap_pgoff() 



take it to mm/util.c, convert vm_mmap() to use of that one and
take it to mm/util.c as well, convert both sys_mmap_pgoff() to
use of vm_mmap_pgoff()

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent dc982501

mm/internal.h

+4 −0
Original line number Diff line number Diff line
@@ -342,3 +342,7 @@ extern u64 hwpoison_filter_flags_mask; 
extern u64 hwpoison_filter_flags_value;

extern u64 hwpoison_filter_memcg;

extern u32 hwpoison_filter_enable;



extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,

        unsigned long, unsigned long,

        unsigned long, unsigned long);

mm/mmap.c

+1 −29
Original line number Diff line number Diff line
@@ -1102,28 +1102,6 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, 
	return mmap_region(file, addr, len, flags, vm_flags, pgoff);

}



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;



	if (unlikely(offset + PAGE_ALIGN(len) < offset))

		return -EINVAL;

	if (unlikely(offset & ~PAGE_MASK))

		return -EINVAL;



	ret = security_mmap_file(file, prot, flag);

	if (!ret) {

		down_write(&mm->mmap_sem);

		ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);

		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,

		unsigned long, fd, unsigned long, pgoff)
@@ -1155,13 +1133,7 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, 


	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);



	retval = security_mmap_file(file, prot, flags);

	if (!retval) {

		down_write(&current->mm->mmap_sem);

		retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);

		up_write(&current->mm->mmap_sem);

	}



	retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);

	if (file)

		fput(file);

out:

mm/nommu.c

+1 −28
Original line number Diff line number Diff line
@@ -1470,28 +1470,6 @@ error_getting_region: 
	return -ENOMEM;

}



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;



	if (unlikely(offset + PAGE_ALIGN(len) < offset))

		return -EINVAL;

	if (unlikely(offset & ~PAGE_MASK))

		return -EINVAL;



	ret = security_mmap_file(file, prot, flag);

	if (!ret) {

		down_write(&mm->mmap_sem);

		ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);

		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,

		unsigned long, fd, unsigned long, pgoff)
@@ -1508,12 +1486,7 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, 


	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);



	ret = security_mmap_file(file, prot, flags);

	if (!ret) {

		down_write(&current->mm->mmap_sem);

		retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);

		up_write(&current->mm->mmap_sem);

	}

	ret = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);



	if (file)

		fput(file);

mm/util.c

+30 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#include <linux/export.h>

#include <linux/err.h>

#include <linux/sched.h>

#include <linux/security.h>

#include <asm/uaccess.h>



#include "internal.h"
@@ -341,6 +342,35 @@ int __attribute__((weak)) get_user_pages_fast(unsigned long start, 
}

EXPORT_SYMBOL_GPL(get_user_pages_fast);



unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,

	unsigned long len, unsigned long prot,

	unsigned long flag, unsigned long pgoff)

{

	unsigned long ret;

	struct mm_struct *mm = current->mm;



	ret = security_mmap_file(file, prot, flag);

	if (!ret) {

		down_write(&mm->mmap_sem);

		ret = do_mmap_pgoff(file, addr, len, prot, flag, pgoff);

		up_write(&mm->mmap_sem);

	}

	return ret;

}



unsigned long vm_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 vm_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);

}

EXPORT_SYMBOL(vm_mmap);



/* Tracepoints definitions. */

EXPORT_TRACEPOINT_SYMBOL(kmalloc);

EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);

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