diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2012-05-30 20:17:35 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-06-01 10:37:18 -0400 |
commit | eb36c5873b96e8c7376768d3906da74aae6e3839 (patch) | |
tree | 01c5290ed4c55fea85e0dc3f8d70eeaab44678cf /mm/util.c | |
parent | dc982501d9643ab0c117e7d87562857ce234652d (diff) | |
download | lwn-eb36c5873b96e8c7376768d3906da74aae6e3839.tar.gz lwn-eb36c5873b96e8c7376768d3906da74aae6e3839.zip |
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/util.c')
-rw-r--r-- | mm/util.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index ae962b31de88..8c7265afa29f 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); |