Add gjournal specific code to the UFS file system:

- Add FS_GJOURNAL flag which enables gjournal support on a file system.
- Add cg_unrefs field to the cylinder group structure which holds
  number of unreferenced (orphaned) inodes in the given cylinder group.
- Add fs_unrefs field to the super block structure which holds
  total number of unreferenced (orphaned) inodes.
- When file or a directory is orphaned (last reference is removed, but
  object is still open), increase fs_unrefs and cg_unrefs fields,
  which is a hint for fsck in which cylinder groups looks for such
  (orphaned) objects.
- When file is last closed, decrease {fs,cg}_unrefs fields.
- Add VV_DELETED vnode flag which points at orphaned objects.

Sponsored by:	home.pl

sys/kern/vfs_subr.c

@@ -2530,6 +2530,8 @@ vn_printf(struct vnode *vp, const char *fmt, ...)
 		strcat(buf, "|VV_TEXT");
 	if (vp->v_vflag & VV_SYSTEM)
 		strcat(buf, "|VV_SYSTEM");
+	if (vp->v_vflag & VV_DELETED)
+		strcat(buf, "|VV_DELETED");
 	if (vp->v_iflag & VI_DOOMED)
 		strcat(buf, "|VI_DOOMED");
 	if (vp->v_iflag & VI_FREE)

sys/sys/vnode.h

@@ -253,6 +253,7 @@ struct xvnode {
 #define	VV_SYSTEM	0x0080	/* vnode being used by kernel */
 #define	VV_PROCDEP	0x0100	/* vnode is process dependent */
 #define	VV_NOKNOTE	0x0200	/* don't activate knotes on this vnode */
+#define	VV_DELETED	0x0400	/* should be removed */
 
 /*
  * Vnode attributes.  A field value of VNOVAL represents a field whose value

sys/ufs/ffs/ffs_extern.h

@@ -72,6 +72,7 @@ int	ffs_mountroot(void);
 int	ffs_reallocblks(struct vop_reallocblks_args *);
 int	ffs_realloccg(struct inode *, ufs2_daddr_t, ufs2_daddr_t,
 	    ufs2_daddr_t, int, int, struct ucred *, struct buf **);
+int	ffs_sbupdate(struct ufsmount *, int, int);
 void	ffs_setblock(struct fs *, u_char *, ufs1_daddr_t);
 int	ffs_snapblkfree(struct fs *, struct vnode *, ufs2_daddr_t, long, ino_t);
 void	ffs_snapremove(struct vnode *vp);

sys/ufs/ffs/ffs_vfsops.c

@@ -54,6 +54,7 @@ __FBSDID("$FreeBSD$");
 #include <security/mac/mac_framework.h>
 
 #include <ufs/ufs/extattr.h>
+#include <ufs/ufs/gjournal.h>
 #include <ufs/ufs/quota.h>
 #include <ufs/ufs/ufsmount.h>
 #include <ufs/ufs/inode.h>
@@ -71,7 +72,6 @@ __FBSDID("$FreeBSD$");
 
 static uma_zone_t uma_inode, uma_ufs1, uma_ufs2;
 
-static int	ffs_sbupdate(struct ufsmount *, int, int);
 static int	ffs_reload(struct mount *, struct thread *);
 static int	ffs_mountfs(struct vnode *, struct mount *, struct thread *);
 static void	ffs_oldfscompat_read(struct fs *, struct ufsmount *,
@@ -696,6 +696,35 @@ ffs_mountfs(devvp, mp, td)
 		fs->fs_pendingblocks = 0;
 		fs->fs_pendinginodes = 0;
 	}
+	if ((fs->fs_flags & FS_GJOURNAL) != 0) {
+#ifdef UFS_GJOURNAL
+		/*
+		 * Get journal provider name.
+		 */
+		size = 1024;
+		mp->mnt_gjprovider = malloc(size, M_UFSMNT, M_WAITOK);
+		if (g_io_getattr("GJOURNAL::provider", cp, &size,
+		    mp->mnt_gjprovider) == 0) {
+			mp->mnt_gjprovider = realloc(mp->mnt_gjprovider, size,
+			    M_UFSMNT, M_WAITOK);
+			MNT_ILOCK(mp);
+			mp->mnt_flag |= MNT_GJOURNAL;
+			MNT_IUNLOCK(mp);
+		} else {
+			printf(
+"WARNING: %s: GJOURNAL flag on fs but no gjournal provider below\n",
+			    mp->mnt_stat.f_mntonname);
+			free(mp->mnt_gjprovider, M_UFSMNT);
+			mp->mnt_gjprovider = NULL;
+		}
+#else
+		printf(
+"WARNING: %s: GJOURNAL flag on fs but no UFS_GJOURNAL support\n",
+		    mp->mnt_stat.f_mntonname);
+#endif
+	} else {
+		mp->mnt_gjprovider = NULL;
+	}
 	ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO);
 	ump->um_cp = cp;
 	ump->um_bo = &devvp->v_bufobj;
@@ -871,6 +900,10 @@ out:
 	}
 	if (ump) {
 		mtx_destroy(UFS_MTX(ump));
+		if (mp->mnt_gjprovider != NULL) {
+			free(mp->mnt_gjprovider, M_UFSMNT);
+			mp->mnt_gjprovider = NULL;
+		}
 		free(ump->um_fs, M_UFSMNT);
 		free(ump, M_UFSMNT);
 		mp->mnt_data = (qaddr_t)0;
@@ -1030,6 +1063,10 @@ ffs_unmount(mp, mntflags, td)
 	PICKUP_GIANT();
 	vrele(ump->um_devvp);
 	mtx_destroy(UFS_MTX(ump));
+	if (mp->mnt_gjprovider != NULL) {
+		free(mp->mnt_gjprovider, M_UFSMNT);
+		mp->mnt_gjprovider = NULL;
+	}
 	free(fs->fs_csp, M_UFSMNT);
 	free(fs, M_UFSMNT);
 	free(ump, M_UFSMNT);
@@ -1514,7 +1551,7 @@ ffs_uninit(vfsp)
 /*
  * Write a superblock and associated information back to disk.
  */
-static int
+int
 ffs_sbupdate(mp, waitfor, suspended)
 	struct ufsmount *mp;
 	int waitfor;

sys/ufs/ffs/fs.h

@@ -323,7 +323,8 @@ struct fs {
 	u_int	*fs_active;		/* (u) used by snapshots to track fs */
 	int32_t	 fs_old_cpc;		/* cyl per cycle in postbl */
 	int32_t	 fs_maxbsize;		/* maximum blocking factor permitted */
-	int64_t	 fs_sparecon64[17];	/* old rotation block list head */
+	int64_t	 fs_unrefs;		/* number of unreferenced inodes */
+	int64_t	 fs_sparecon64[16];	/* old rotation block list head */
 	int64_t	 fs_sblockloc;		/* byte offset of standard superblock */
 	struct	csum_total fs_cstotal;	/* (u) cylinder summary information */
 	ufs_time_t fs_time;		/* last time written */
@@ -406,6 +407,7 @@ CTASSERT(sizeof(struct fs) == 1376);
 #define FS_INDEXDIRS  0x08	/* kernel supports indexed directories */
 #define FS_ACLS       0x10	/* file system has ACLs enabled */
 #define FS_MULTILABEL 0x20	/* file system is MAC multi-label */
+#define FS_GJOURNAL   0x40	/* gjournaled file system */
 #define FS_FLAGS_UPDATED 0x80	/* flags have been moved to new location */
 
 /*
@@ -475,7 +477,8 @@ struct cg {
 	int32_t	 cg_nclusterblks;	/* number of clusters this cg */
 	int32_t  cg_niblk;		/* number of inode blocks this cg */
 	int32_t	 cg_initediblk;		/* last initialized inode */
-	int32_t	 cg_sparecon32[3];	/* reserved for future use */
+	int32_t	 cg_unrefs;		/* number of unreferenced inodes */
+	int32_t	 cg_sparecon32[2];	/* reserved for future use */
 	ufs_time_t cg_time;		/* time last written */
 	int64_t	 cg_sparecon64[3];	/* reserved for future use */
 	u_int8_t cg_space[1];		/* space for cylinder group maps */

sys/ufs/ufs/gjournal.h

@@ -0,0 +1,37 @@
+/*-
+ * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _UFS_UFS_GJOURNAL_H_
+#define _UFS_UFS_GJOURNAL_H_
+
+/*
+ * GEOM journal function prototypes.
+ */
+void	ufs_gjournal_orphan(struct vnode *fvp);
+void	ufs_gjournal_close(struct vnode *vp);
+#endif /* !_UFS_UFS_GJOURNAL_H_ */

sys/ufs/ufs/ufs_gjournal.c

@@ -0,0 +1,150 @@
+/*-
+ * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_ufs.h"
+
+#ifdef UFS_GJOURNAL
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/vnode.h>
+#include <sys/lock.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+
+#include <ufs/ufs/extattr.h>
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+#include <ufs/ufs/ufsmount.h>
+#include <ufs/ufs/gjournal.h>
+
+#include <ufs/ffs/fs.h>
+#include <ufs/ffs/ffs_extern.h>
+
+/*
+ * Change the number of unreferenced inodes.
+ */
+static int
+ufs_gjournal_modref(struct vnode *vp, int count)
+{
+	struct cg *cgp;
+	struct buf *bp;
+	ufs2_daddr_t cgbno;
+	int error, cg;
+	struct cdev *dev;
+	struct inode *ip;
+	struct ufsmount *ump;
+	struct fs *fs;
+	struct vnode *devvp;
+	ino_t ino;
+
+	ip = VTOI(vp);
+	ump = ip->i_ump;
+	fs = ip->i_fs;
+	devvp = ip->i_devvp;
+	ino = ip->i_number;
+
+	cg = ino_to_cg(fs, ino);
+	if (devvp->v_type != VCHR) {
+		/* devvp is a snapshot */
+		dev = VTOI(devvp)->i_devvp->v_rdev;
+		cgbno = fragstoblks(fs, cgtod(fs, cg));
+	} else {
+		/* devvp is a normal disk device */
+		dev = devvp->v_rdev;
+		cgbno = fsbtodb(fs, cgtod(fs, cg));
+	}
+	if ((u_int)ino >= fs->fs_ipg * fs->fs_ncg)
+		panic("ffs_freefile: range: dev = %s, ino = %lu, fs = %s",
+		    devtoname(dev), (u_long)ino, fs->fs_fsmnt);
+	if ((error = bread(devvp, cgbno, (int)fs->fs_cgsize, NOCRED, &bp))) {
+		brelse(bp);
+		return (error);
+	}
+	cgp = (struct cg *)bp->b_data;
+	if (!cg_chkmagic(cgp)) {
+		brelse(bp);
+		return (0);
+	}
+	bp->b_xflags |= BX_BKGRDWRITE;
+	cgp->cg_unrefs += count;
+	UFS_LOCK(ump);
+	fs->fs_unrefs += count;
+	fs->fs_fmod = 1;
+	ACTIVECLEAR(fs, cg);
+	UFS_UNLOCK(ump);
+	bdwrite(bp);
+	return (0);
+}
+
+void
+ufs_gjournal_orphan(struct vnode *fvp)
+{
+	struct mount *mp;
+	struct inode *ip;
+
+	mp = fvp->v_mount;
+	if (mp->mnt_gjprovider == NULL)
+		return;
+	VI_LOCK(fvp);
+	if (fvp->v_usecount < 2 || (fvp->v_vflag & VV_DELETED)) {
+		VI_UNLOCK(fvp);
+		return;
+	}
+	ip = VTOI(fvp);
+	if ((fvp->v_type == VDIR && ip->i_nlink > 2) ||
+	    (fvp->v_type != VDIR && ip->i_nlink > 1)) {
+		VI_UNLOCK(fvp);
+		return;
+	}
+	fvp->v_vflag |= VV_DELETED;
+	VI_UNLOCK(fvp);
+
+	ufs_gjournal_modref(fvp, 1);
+}
+
+void
+ufs_gjournal_close(struct vnode *vp)
+{
+	struct mount *mp;
+	struct inode *ip;
+
+	mp = vp->v_mount;
+	if (mp->mnt_gjprovider == NULL)
+		return;
+	if (!(vp->v_vflag & VV_DELETED))
+		return;
+	ip = VTOI(vp);
+	if (ip->i_nlink > 0)
+		return;
+	ufs_gjournal_modref(vp, -1);
+}
+
+#endif /* UFS_GJOURNAL */

sys/ufs/ufs/ufs_inode.c

@@ -57,6 +57,9 @@ __FBSDID("$FreeBSD$");
 #include <ufs/ufs/dir.h>
 #include <ufs/ufs/dirhash.h>
 #endif
+#ifdef UFS_GJOURNAL
+#include <ufs/ufs/gjournal.h>
+#endif
 
 /*
  * Last reference to an inode.  If necessary, write or delete it.
@@ -83,6 +86,9 @@ ufs_inactive(ap)
 	 */
 	if (ip->i_mode == 0)
 		goto out;
+#ifdef UFS_GJOURNAL
+	ufs_gjournal_close(vp);
+#endif
 	if ((ip->i_effnlink == 0 && DOINGSOFTDEP(vp)) ||
 	    (ip->i_nlink <= 0 &&
 	     (vp->v_mount->mnt_flag & MNT_RDONLY) == 0)) {

sys/ufs/ufs/ufs_vnops.c

@@ -83,6 +83,9 @@ __FBSDID("$FreeBSD$");
 #ifdef UFS_DIRHASH
 #include <ufs/ufs/dirhash.h>
 #endif
+#ifdef UFS_GJOURNAL
+#include <ufs/ufs/gjournal.h>
+#endif
 
 #include <ufs/ffs/ffs_extern.h>
 
@@ -803,6 +806,9 @@ ufs_remove(ap)
 		error = EPERM;
 		goto out;
 	}
+#ifdef UFS_GJOURNAL
+	ufs_gjournal_orphan(vp);
+#endif
 	error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
 	if (ip->i_nlink <= 0)
 		vp->v_vflag |= VV_NOSYNC;
@@ -1709,6 +1715,9 @@ ufs_rmdir(ap)
 		error = EINVAL;
 		goto out;
 	}
+#ifdef UFS_GJOURNAL
+	ufs_gjournal_orphan(vp);
+#endif
 	/*
 	 * Delete reference to directory before purging
 	 * inode.  If we crash in between, the directory