1 files changed, 7 insertions, 1 deletions

diff --git a/mm/msync.c b/mm/msync.c
index 632df4527c01..a5c673669ca6 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -58,6 +58,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
         vma = find_vma(mm, start);
         for (;;) {
                 struct file *file;
+                loff_t fstart, fend;
 
                 /* Still start < end. */
                 error = -ENOMEM;
@@ -77,12 +78,17 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
                         goto out_unlock;
                 }
                 file = vma->vm_file;
+                fstart = start + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
+                fend = fstart + (min(end, vma->vm_end) - start) - 1;
                 start = vma->vm_end;
                 if ((flags & MS_SYNC) && file &&
                                 (vma->vm_flags & VM_SHARED)) {
                         get_file(file);
                         up_read(&mm->mmap_sem);
-                        error = vfs_fsync(file, 0);
+                        if (vma->vm_flags & VM_NONLINEAR)
+                                error = vfs_fsync(file, 1);
+                        else
+                                error = vfs_fsync_range(file, fstart, fend, 1);
                         fput(file);
                         if (error || start >= end)
                                 goto out;