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authorAl Viro <viro@zeniv.linux.org.uk>2012-05-30 20:17:35 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-06-01 10:37:18 -0400
commiteb36c5873b96e8c7376768d3906da74aae6e3839 (patch)
tree01c5290ed4c55fea85e0dc3f8d70eeaab44678cf /mm
parentdc982501d9643ab0c117e7d87562857ce234652d (diff)
downloadlinux-eb36c5873b96e8c7376768d3906da74aae6e3839.tar.gz
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: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm')
-rw-r--r--mm/internal.h4
-rw-r--r--mm/mmap.c30
-rw-r--r--mm/nommu.c29
-rw-r--r--mm/util.c30
4 files changed, 36 insertions, 57 deletions
diff --git a/mm/internal.h b/mm/internal.h
index aee4761cf9a..5307a022731 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -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);
diff --git a/mm/mmap.c b/mm/mmap.c
index 538c905d6d9..98ef8a6c2cd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -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:
diff --git a/mm/nommu.c b/mm/nommu.c
index e6123a5b2cc..c4acfbc0997 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -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);
diff --git a/mm/util.c b/mm/util.c
index ae962b31de8..8c7265afa29 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -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);