This patch fixes a long standing complaint with soft updates in

which small and/or nearly full filesystems would fail with `file
system full' messages when trying to replace a number of existing
files (for example during a system installation). When the allocation
routines are about to fail with a file system full condition, they
make a call to softdep_request_cleanup() which attempts to accelerate
the flushing of pending deletion requests in an effort to free up
space. In the face of filesystem I/O requests that exceed the
available disk transfer capacity, the cleanup request could take
an unbounded amount of time. Thus, the softdep_request_cleanup()
routine will only try for tickdelay seconds (default 2 seconds)
before giving up and returning a filesystem full error. Under typical
conditions, the softdep_request_cleanup() routine is able to free
up space in under fifty milliseconds.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/ufs/ffs/ffs_extern.h b/sys/ufs/ffs/ffs_extern.h
index 49f0279..b70f7f7 100644
--- a/sys/ufs/ffs/ffs_extern.h
+++ b/sys/ufs/ffs/ffs_extern.h
@@ -109,6 +109,7 @@ int	softdep_flushfiles __P((struct mount *, int, struct thread *));
 void	softdep_update_inodeblock __P((struct inode *, struct buf *, int));
 void	softdep_load_inodeblock __P((struct inode *));
 void	softdep_freefile __P((struct vnode *, ino_t, int));
+int	softdep_request_cleanup __P((struct fs *, struct vnode *));
 void	softdep_setup_freeblocks __P((struct inode *, off_t));
 void	softdep_setup_inomapdep __P((struct buf *, struct inode *, ino_t));
 void	softdep_setup_blkmapdep __P((struct buf *, struct fs *, ufs_daddr_t));