[src/netbsd-3]: src/sbin/resize_lfs Apply patch (requested by perseant in tic...

[tron <tron%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9ffbd9c2b7f6
branches:  netbsd-3
changeset: 575733:9ffbd9c2b7f6
user:      tron <tron%NetBSD.org@localhost>
date:      Sat May 07 15:18:05 2005 +0000

description:
Apply patch (requested by perseant in ticket #242):
* fsck_lfs buffer cache fixes, including PR #29151
* Change fsck_lfs phase 0 message to reflect reality
* fsck_lfs: check phase 5 (cleanerinfo accounting) even on
  roll-forward
* Keep better track of the free list during roll-forward, avoiding
  a core dump
* Improve hash table use for fsck_lfs buffer and vnode cache
* Document fsck_lfs flag -f, and implement -q
* Add resize_lfs, including kernel support
* Add LFS to mountd's list of exportable filesystem types
* Make the LFS lkm work again [christos@]
* Add MP locking to the LFS kernel subsystem
* Fix pager_map deadlock in lfs_putpages()
* Avoid incomplete file extension that looks like "partial
  truncation" to fsck
* Use lfs_malloc for cleaner malloc, since the cleaner often runs
  in low-memory conditions.
* Use splay trees, not hash table, to track page allocation for
  write.
* Fix mkdir panic on full fs
* Fix page accounting leak by counting differently.
* Use rightly named structure for lfs_getattr [skrll@]
* Cosmetic changes for readability.

diffstat:

 sbin/resize_lfs/Makefile     |    6 +
 sbin/resize_lfs/resize_lfs.8 |   91 ++++++++++++++++++++++
 sbin/resize_lfs/resize_lfs.c |  172 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 269 insertions(+), 0 deletions(-)

diffs (281 lines):

diff -r 7f46d87a41e9 -r 9ffbd9c2b7f6 sbin/resize_lfs/Makefile
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sbin/resize_lfs/Makefile  Sat May 07 15:18:05 2005 +0000
@@ -0,0 +1,6 @@
+#      $NetBSD: Makefile,v 1.1.2.2 2005/05/07 15:18:05 tron Exp $
+
+PROG=resize_lfs
+MAN=resize_lfs.8
+
+.include <bsd.prog.mk>
diff -r 7f46d87a41e9 -r 9ffbd9c2b7f6 sbin/resize_lfs/resize_lfs.8
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sbin/resize_lfs/resize_lfs.8      Sat May 07 15:18:05 2005 +0000
@@ -0,0 +1,91 @@
+.\"     $NetBSD: resize_lfs.8,v 1.2.2.2 2005/05/07 15:18:05 tron Exp $
+.\"
+.\" Copyright (c) 2005 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Konrad E. Schroder <perseant%hhhh.org@localhost>.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"        This product includes software developed by the NetBSD
+.\"        Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd April 20, 2005
+.Dt RESIZE_LFS 8
+.Sh NAME
+.Nm resize_lfs
+.Nd resize a mounted log-structured filesystem
+.Sh SYNOPSIS
+.Nm
+.Op Fl v
+.Op Fl n Ar new-size
+.Ar mounted-file-system
+.Sh DESCRIPTION
+.Nm
+grows or shrinks a mounted log-structured filesystem to the specified size.
+.Ar mounted-file-system
+is the name of the filesystem to be resized, and
+.Ar new-size
+is the desired new filesystem size, in sectors.
+If
+.Ar new-size
+is not specified,
+.Nm
+will default to the current size of the partition containing the filesystem
+in question.
+.Pp
+When growing, the partition must be large enough to contain a filesystem
+of the specified size; when shrinking,
+.Nm
+must first
+.Dq clean
+the segments that will be invalid when the filesystem is shrunk.
+If this cleaning process results in these segments becoming redirtied,
+this indicates that the given new size is not large enough to contain the
+existing filesystem data, and
+.Nm
+will return an error.
+.Sh EXAMPLES
+To resize the file system mounted at
+.Pa /home
+to 32576 sectors:
+.Dl resize_lfs -n 32576 /home
+.Sh SEE ALSO
+.Xr fsck_lfs 8 ,
+.Xr lfs_cleanerd 8 ,
+.Xr newfs_lfs 8
+.Sh HISTORY
+The
+.Nm
+command first appeared in
+.Nx 3.0 .
+.Sh AUTHORS
+.An Konrad Schroder
+.Aq perseant%NetBSD.org@localhost
+.Sh BUGS
+.Nm
+should be able to resize an unmounted filesystem as well.
diff -r 7f46d87a41e9 -r 9ffbd9c2b7f6 sbin/resize_lfs/resize_lfs.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sbin/resize_lfs/resize_lfs.c      Sat May 07 15:18:05 2005 +0000
@@ -0,0 +1,172 @@
+/*     $NetBSD: resize_lfs.c,v 1.1.2.2 2005/05/07 15:18:05 tron Exp $  */
+/*-
+ * Copyright (c) 2005 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Konrad E. Schroder <perseant%hhhh.org@localhost>.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/disklabel.h>
+#include <sys/file.h>
+#include <sys/mount.h>
+#include <sys/statvfs.h>
+
+#include <ufs/ufs/dinode.h>
+#include <ufs/lfs/lfs.h>
+
+#include <disktab.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void
+usage(void)
+{
+       errx(1, "usage: resize_lfs [-v] [-s new-size] [filesystem]\n");
+}
+
+int
+main(int argc, char **argv)
+{
+       char *cp, *rdev, *fsname, buf[LFS_SBPAD];
+       daddr_t newsize, newnsegs;
+       int devfd, rootfd;
+       int ch, i, verbose;
+       off_t secsize, sboff;
+       struct disklabel lbl;
+       struct lfs *fs;
+       struct partition *pp;
+       struct statvfs vfs;
+
+       /* Initialize and parse arguments */
+       newsize = 0;
+       while ((ch = getopt(argc, argv, "s:v")) != -1) {
+               switch(ch) {
+               case 's':       /* New size, in sectors */
+                       newsize = strtoll(optarg, NULL, 10);
+                       break;
+               case 'v':
+                       ++verbose;
+                       break;
+               default:
+                       usage();
+               }
+       }
+       fsname = argv[optind];
+
+       if (fsname == NULL)
+               usage();
+
+       /*
+        * If the user did not supply a filesystem size, use the
+        * length of the mounted partition.
+        */
+       if (statvfs(fsname, &vfs) < 0)
+               err(1, "%s", fsname);
+       rdev = (char *)malloc(strlen(vfs.f_mntfromname + 2));
+       sprintf(rdev, "/dev/r%s", vfs.f_mntfromname + 5);
+       devfd = open(rdev, O_RDONLY);
+       if (devfd < 0)
+               err(1, "open raw device");
+
+       /*
+        * Read the disklabel to find the sector size.  Check the
+        * given size against the partition size.  We can skip some
+        * error checking here since we know the fs is mountable.
+        */
+       if (ioctl(devfd, DIOCGDINFO, &lbl) < 0)
+               err(1, "%s: ioctl (GDINFO)", rdev);
+       secsize = lbl.d_secsize;
+       cp = strchr(rdev, '\0') - 1;
+       pp = &lbl.d_partitions[*cp - 'a'];
+       if (newsize > pp->p_size)
+               errx(1, "new size must be <= the partition size");
+       if (newsize == 0)
+               newsize = pp->p_size;
+
+       /* Open the root of the filesystem so we can fcntl() it */
+       rootfd = open(fsname, O_RDONLY);
+       if (rootfd < 0)
+               err(1, "open filesystem root");
+
+       /* Read the superblock, finding alternates if necessary */
+       fs = (struct lfs *)malloc(sizeof(*fs));
+       for (sboff = LFS_LABELPAD;;) {
+               pread(devfd, buf, sboff, LFS_SBPAD);
+               memcpy(&fs->lfs_dlfs, buf, sizeof(struct dlfs));
+               if (sboff == LFS_LABELPAD && fsbtob(fs, 1) > LFS_LABELPAD)
+                       sboff = fsbtob(fs, (off_t)fs->lfs_sboffs[0]);
+               else
+                       break;
+       }
+       close(devfd);
+
+       /* Calculate new number of segments. */
+       newnsegs = (newsize * secsize) / fs->lfs_ssize;
+       if (newnsegs == fs->lfs_nseg) {
+               errx(0, "the filesystem is unchanged.");
+       }
+
+       /*
+        * If the new filesystem is smaller than the old, we have to
+        * invalidate the segments that extend beyond the new boundary.
+        * Make the cleaner do this for us.
+        * (XXX make the kernel able to do this instead?)
+        */
+       for (i = fs->lfs_nseg - 1; i >= newnsegs; --i) {
+               char cmd[80];
+
+               /* If it's already empty, don't call the cleaner */
+               if (fcntl(rootfd, LFCNINVAL, &i) == 0)
+                       continue;
+
+               sprintf(cmd, "/usr/libexec/lfs_cleanerd -q -i %d %s", i, fsname);
+               if (system(cmd) != 0)
+                       err(1, "invalidating segment %d", i);
+       }
+
+       /* Tell the filesystem to resize itself. */
+       if (fcntl(rootfd, LFCNRESIZE, &newnsegs) == -1) {
+               err(1, "resizing");
+       }
+
+       if (verbose)
+               printf("Successfully resized %s from %d to %lld segments\n",
+                       fsname, fs->lfs_nseg, (long long)newnsegs);
+       return 0;
+}