GFS2: Improve cluster mmap scalability

The mmap system call grabs a glock when an update to atime maybe
required. It does this in order to ensure that the flags on the
inode are uptodate, but since it will only mark atime for a future
update, an exclusive lock is not required here (one will be taken
later when the actual update is performed).

Also, the lock can be skipped when the mount is marked noatime in
addition to the original check which only looked at the noatime
flag for the inode itself.

This should increase the scalability of the mmap call when multiple
nodes are all mmaping the same file.

Reported-by: Scooter Morris <scooter@cgl.ucsf.edu>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 7cfdcb9133635978af945d40b2b450d52dbe5de9..216ad2774a622edc87074a83e55c44f61dbaba14 100644 (file)
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -448,15 +448,20 @@ static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
 {
        struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 
-       if (!(file->f_flags & O_NOATIME)) {
+       if (!(file->f_flags & O_NOATIME) &&
+           !IS_NOATIME(&ip->i_inode)) {
                struct gfs2_holder i_gh;
                int error;
 
-               gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
+               gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
                error = gfs2_glock_nq(&i_gh);
-               file_accessed(file);
-               if (error == 0)
-                       gfs2_glock_dq_uninit(&i_gh);
+               if (error == 0) {
+                       file_accessed(file);
+                       gfs2_glock_dq(&i_gh);
+               }
+               gfs2_holder_uninit(&i_gh);
+               if (error)
+                       return error;
        }
        vma->vm_ops = &gfs2_vm_ops;
        vma->vm_flags |= VM_CAN_NONLINEAR;