[src/trunk]: src/sbin/resize_ffs Be explicit about byteswapped and ffsv2 file...

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

details:   https://anonhg.NetBSD.org/src/rev/4cf6a80d8a9a
branches:  trunk
changeset: 759676:4cf6a80d8a9a
user:      riz <riz%NetBSD.org@localhost>
date:      Tue Dec 14 20:45:22 2010 +0000

description:
Be explicit about byteswapped and ffsv2 file systems being currently
unsupported, while catching up to some changes in my local tree which
will hopefully support them at some time in the future.

Also, change "device" variable to "special", to reflect the fact
that resize_ffs will work on a plain file.

diffstat:

 sbin/resize_ffs/resize_ffs.c |  48 +++++++++++++++++++++++++++++++++-----------
 1 files changed, 36 insertions(+), 12 deletions(-)

diffs (117 lines):

diff -r 38bc0a7430f9 -r 4cf6a80d8a9a sbin/resize_ffs/resize_ffs.c
--- a/sbin/resize_ffs/resize_ffs.c      Tue Dec 14 20:09:43 2010 +0000
+++ b/sbin/resize_ffs/resize_ffs.c      Tue Dec 14 20:45:22 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: resize_ffs.c,v 1.22 2010/12/14 04:04:20 riz Exp $      */
+/*     $NetBSD: resize_ffs.c,v 1.23 2010/12/14 20:45:22 riz Exp $      */
 /* From sources sent on February 17, 2003 */
 /*-
  * As its sole author, I explicitly place this code in the public
@@ -64,7 +64,7 @@
 /* new size of filesystem, in sectors */
 static uint32_t newsize;
 
-/* fd open onto disk device */
+/* fd open onto disk device or file */
 static int fd;
 
 /* must we break up big I/O operations - see checksmallio() */
@@ -131,6 +131,10 @@
 #define NSPB(fs)       ((fs)->fs_old_nspf << (fs)->fs_fragshift)
 #define NSPF(fs)       ((fs)->fs_old_nspf)
 
+/* global flags */
+int is_ufs2 = 0;
+int needswap = 0;
+
 static void usage(void) __dead;
 
 /*
@@ -1873,7 +1877,7 @@
        int SFlag;
        size_t i;
 
-       char *device;
+       char *special;
        char reply[5];
        
        newsize = 0;
@@ -1905,10 +1909,10 @@
                usage();
        }
 
-       device = *argv;
+       special = *argv;
 
        if (ExpertFlag == 0) {
-               printf("It's required to manually run fsck on filesystem device "
+               printf("It's required to manually run fsck on filesystem "
                    "before you can resize it\n\n"
                    " Did you run fsck on your disk (Yes/No) ? ");
                fgets(reply, (int)sizeof(reply), stdin);
@@ -1918,13 +1922,13 @@
                }
        }
        
-       fd = open(device, O_RDWR, 0);
+       fd = open(special, O_RDWR, 0);
        if (fd < 0)
-               err(EXIT_FAILURE, "Can't open `%s'", device);
+               err(EXIT_FAILURE, "Can't open `%s'", special);
        checksmallio();
 
        if (SFlag == 0) {
-               newsize = get_dev_size(device);
+               newsize = get_dev_size(special);
                if (newsize == 0)
                        err(EXIT_FAILURE,
                            "Can't resize filesystem, newsize not known.");
@@ -1934,10 +1938,25 @@
        newsb = (struct fs *) (SBLOCKSIZE + (char *) &sbbuf);
        for (where = search[i = 0]; search[i] != -1; where = search[++i]) {
                readat(where / DEV_BSIZE, oldsb, SBLOCKSIZE);
-               if (where == SBLOCK_UFS2 && (oldsb->fs_magic == FS_UFS1_MAGIC))
+               switch (oldsb->fs_magic) {
+               case FS_UFS2_MAGIC:
+                       /* FALLTHROUGH */
+                       is_ufs2 = 1;
+               case FS_UFS1_MAGIC:
+                       needswap = 0;
+                       break;
+               case FS_UFS2_MAGIC_SWAPPED:
+                       is_ufs2 = 1;
+                       /* FALLTHROUGH */
+               case FS_UFS1_MAGIC_SWAPPED:
+                       needswap = 1;
+                       break;
+               default:
                        continue;
-               if (oldsb->fs_magic == FS_UFS1_MAGIC)
-                       break;
+               }
+               if (!is_ufs2 && where == SBLOCK_UFS2)
+                       continue;
+               break;
        }
        if (where == (off_t)-1)
                errx(EXIT_FAILURE, "Bad magic number");
@@ -1953,6 +1972,11 @@
                /* any others? */
                printf("Resizing with ffsv1 superblock\n");
        }
+       if (is_ufs2)
+               errx(EXIT_FAILURE, "ffsv2 file systems currently unsupported.");
+       if (needswap)
+               errx(EXIT_FAILURE, "Swapped byte order file system detected"
+                   " - currently unsupported.");
        oldsb->fs_qbmask = ~(int64_t) oldsb->fs_bmask;
        oldsb->fs_qfmask = ~(int64_t) oldsb->fs_fmask;
        if (oldsb->fs_ipg % INOPB(oldsb)) {
@@ -1982,6 +2006,6 @@
 usage(void)
 {
 
-       (void)fprintf(stderr, "usage: %s [-y] [-s size] device\n", getprogname());
+       (void)fprintf(stderr, "usage: %s [-y] [-s size] special\n", getprogname());
        exit(EXIT_FAILURE);
 }