GFS2: Introduce new gfs2_log_header_v2

This patch adds a new structure called gfs2_log_header_v2 which is used
to store expanded fields into previously unused areas of the log headers
(i.e., this change is backwards compatible).  Some of these are used for
debug purposes so we can backtrack when problems occur.  Others are
reserved for future expansion.

This patch is based on a prototype from Steve Whitehouse.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index cdd1c5f06f45..2daab13a9e0b 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -107,7 +107,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
         __gfs2_ail_flush(gl, 0, tr.tr_revokes);
 
         gfs2_trans_end(sdp);
-        gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
+        gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL);
 }
 
 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
@@ -128,7 +128,7 @@ void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
                 return;
         __gfs2_ail_flush(gl, fsync, max_revokes);
         gfs2_trans_end(sdp);
-        gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
+        gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL);
 }
 
 /**
@@ -157,7 +157,7 @@ static void rgrp_go_sync(struct gfs2_glock *gl)
                 return;
         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 
-        gfs2_log_flush(sdp, gl, NORMAL_FLUSH);
+        gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL);
         filemap_fdatawrite_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
         error = filemap_fdatawait_range(mapping, gl->gl_vm.start, gl->gl_vm.end);
         mapping_set_error(mapping, error);
@@ -252,7 +252,7 @@ static void inode_go_sync(struct gfs2_glock *gl)
 
         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 
-        gfs2_log_flush(gl->gl_name.ln_sbd, gl, NORMAL_FLUSH);
+        gfs2_log_flush(gl->gl_name.ln_sbd, gl, GFS2_LOG_HEAD_FLUSH_NORMAL);
         filemap_fdatawrite(metamapping);
         if (isreg) {
                 struct address_space *mapping = ip->i_inode.i_mapping;
@@ -303,7 +303,8 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
         }
 
         if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
-                gfs2_log_flush(gl->gl_name.ln_sbd, NULL, NORMAL_FLUSH);
+                gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
+                               GFS2_LOG_HEAD_FLUSH_NORMAL);
                 gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
         }
         if (ip && S_ISREG(ip->i_inode.i_mode))
@@ -495,7 +496,7 @@ static void freeze_go_sync(struct gfs2_glock *gl)
                         gfs2_assert_withdraw(sdp, 0);
                 }
                 queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
-                gfs2_log_flush(sdp, NULL, FREEZE_FLUSH);
+                gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE);
         }
 }