[GFS2] Move pin/unpin into lops.c, clean up locking

gfs2_pin and gfs2_unpin are only used in lops.c, despite being
defined in meta_io.c, so this patch moves them into lops.c and
makes them static. At the same time, its possible to clean up
the locking in the buf and databuf _lo_add() functions so that
we only need to grab the spinlock once. Also we have to move
lock_buffer() around the _lo_add() functions since we can't
do that in gfs2_pin() any more since we hold the spinlock
for the duration of that function.

As a result, the code shrinks by 12 lines and we do far fewer
operations when adding buffers to the log. It also makes the
code somewhat easier to read & understand.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 0 insertions, 70 deletions

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 8da343b34ae7..d762e4f7044e 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -298,76 +298,6 @@ void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
 }
 
 /**
- * gfs2_pin - Pin a buffer in memory
- * @sdp: the filesystem the buffer belongs to
- * @bh: The buffer to be pinned
- *
- */
-
-void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
-{
-        struct gfs2_bufdata *bd = bh->b_private;
-
-        gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
-
-        if (test_set_buffer_pinned(bh))
-                gfs2_assert_withdraw(sdp, 0);
-
-        wait_on_buffer(bh);
-
-        /* If this buffer is in the AIL and it has already been written
-           to in-place disk block, remove it from the AIL. */
-
-        gfs2_log_lock(sdp);
-        if (bd->bd_ail && !buffer_in_io(bh))
-                list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
-        gfs2_log_unlock(sdp);
-
-        clear_buffer_dirty(bh);
-        wait_on_buffer(bh);
-
-        if (!buffer_uptodate(bh))
-                gfs2_io_error_bh(sdp, bh);
-
-        get_bh(bh);
-}
-
-/**
- * gfs2_unpin - Unpin a buffer
- * @sdp: the filesystem the buffer belongs to
- * @bh: The buffer to unpin
- * @ai:
- *
- */
-
-void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
-                struct gfs2_ail *ai)
-{
-        struct gfs2_bufdata *bd = bh->b_private;
-
-        gfs2_assert_withdraw(sdp, buffer_uptodate(bh));
-
-        if (!buffer_pinned(bh))
-                gfs2_assert_withdraw(sdp, 0);
-
-        mark_buffer_dirty(bh);
-        clear_buffer_pinned(bh);
-
-        gfs2_log_lock(sdp);
-        if (bd->bd_ail) {
-                list_del(&bd->bd_ail_st_list);
-                brelse(bh);
-        } else {
-                struct gfs2_glock *gl = bd->bd_gl;
-                list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
-                atomic_inc(&gl->gl_ail_count);
-        }
-        bd->bd_ail = ai;
-        list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
-        gfs2_log_unlock(sdp);
-}
-
-/**
  * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
  * @ip: the inode who owns the buffers
  * @bstart: the first buffer in the run