[PATCH] madvise() does not always return -EBADF on non-file mapped area
The madvise() system call returns -EBADF for areas which does not map to
files, only for *behaviour* request MADV_WILLNEED.
According to man pages, madvise returns :
EBADF - the map exists, but the area maps something that isn't a file.
Fixes bug 2995.
Signed-off-by: Suzuki K P <suzuki@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/madvise.c b/mm/madvise.c
index 73180a2..c8c01a1 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -83,9 +83,6 @@
{
struct file *file = vma->vm_file;
- if (!file)
- return -EBADF;
-
if (file->f_mapping->a_ops->get_xip_page) {
/* no bad return value, but ignore advice */
return 0;
@@ -140,11 +137,16 @@
return 0;
}
-static long madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
- unsigned long start, unsigned long end, int behavior)
+static long
+madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
+ unsigned long start, unsigned long end, int behavior)
{
+ struct file *filp = vma->vm_file;
long error = -EBADF;
+ if (!filp)
+ goto out;
+
switch (behavior) {
case MADV_NORMAL:
case MADV_SEQUENTIAL:
@@ -165,6 +167,7 @@
break;
}
+out:
return error;
}