Implement fully asynchronous partial truncation with softupdates journaling

to resolve errors which can cause corruption on recovery with the old
synchronous mechanism.

 - Append partial truncation freework structures to indirdeps while
   truncation is proceeding.  These prevent new block pointers from
   becoming valid until truncation completes and serialize truncations.
 - On completion of a partial truncate journal work waits for zeroed
   pointers to hit indirects.
 - softdep_journal_freeblocks() handles last frag allocation and last
   block zeroing.
 - vtruncbuf/ffs_page_remove moved into softdep_*_freeblocks() so it
   is only implemented in one place.
 - Block allocation failure handling moved up one level so it does not
   proceed with buf locks held.  This permits us to do more extensive
   reclaims when filesystem space is exhausted.
 - softdep_sync_metadata() is broken into two parts, the first executes
   once at the start of ffs_syncvnode() and flushes truncations and
   inode dependencies.  The second is called on each locked buf.  This
   eliminates excessive looping and rollbacks.
 - Improve the mechanism in process_worklist_item() that handles
   acquiring vnode locks for handle_workitem_remove() so that it works
   more generally and does not loop excessively over the same worklist
   items on each call.
 - Don't corrupt directories by zeroing the tail in fsck.  This is only
   done for regular files.
 - Push a fsync complete record for files that need it so the checker
   knows a truncation in the journal is no longer valid.

Discussed with:	mckusick, kib (ffs_pages_remove and ffs_truncate parts)
Tested by:	pho

1 files changed, 2 insertions, 4 deletions

diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
index 68b9619..c7e0bd1 100644
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -2034,12 +2034,10 @@ ffs_geom_strategy(struct bufobj *bo, struct buf *bp)
 static void
 db_print_ffs(struct ufsmount *ump)
 {
-	db_printf("mp %p %s devvp %p fs %p su_wl %d su_wl_in %d su_deps %d "
-		  "su_req %d\n",
+	db_printf("mp %p %s devvp %p fs %p su_wl %d su_deps %d su_req %d\n",
 	    ump->um_mountp, ump->um_mountp->mnt_stat.f_mntonname,
 	    ump->um_devvp, ump->um_fs, ump->softdep_on_worklist,
-	    ump->softdep_on_worklist_inprogress, ump->softdep_deps,
-	    ump->softdep_req);
+	    ump->softdep_deps, ump->softdep_req);
 }
 
 DB_SHOW_COMMAND(ffs, db_show_ffs)