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/* Fetching and storing the hypermetadata (superblock and cg summary info).
Copyright (C) 1994, 1995, 1996 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "ufs.h"
#include <string.h>
#include <stdio.h>
static int oldformat = 0;
vm_address_t zeroblock = 0;
struct fs *sblock = 0;
struct csum *csum = 0;
void
get_hypermetadata (void)
{
error_t err;
if (!sblock)
sblock = malloc (SBSIZE);
/* Free previous values. */
if (zeroblock)
vm_deallocate (mach_task_self (), zeroblock, sblock->fs_bsize);
if (csum)
free (csum);
err = diskfs_catch_exception ();
assert_perror (err);
bcopy (disk_image + SBOFF, sblock, SBSIZE);
diskfs_end_catch_exception ();
if (sblock->fs_magic != FS_MAGIC)
{
fprintf (stderr, "Bad magic number %#lx (should be %#x)\n",
sblock->fs_magic, FS_MAGIC);
exit (1);
}
if (sblock->fs_bsize > 8192)
{
fprintf (stderr, "Block size %ld is too big (max is 8192 bytes)\n",
sblock->fs_bsize);
exit (1);
}
if (sblock->fs_bsize < sizeof (struct fs))
{
fprintf (stderr, "Block size %ld is too small (min is %Zd bytes)\n",
sblock->fs_bsize, sizeof (struct fs));
exit (1);
}
if (sblock->fs_maxsymlinklen > (long)MAXSYMLINKLEN)
{
fprintf (stderr, "Max shortcut symlinklen %ld is too big (max is %ld)\n",
sblock->fs_maxsymlinklen, (long)MAXSYMLINKLEN);
exit (1);
}
assert ((__vm_page_size % DEV_BSIZE) == 0);
assert ((sblock->fs_bsize % DEV_BSIZE) == 0);
assert (__vm_page_size <= sblock->fs_bsize);
/* If this is an old filesystem, then we have some more
work to do; some crucial constants might not be set; we
are therefore forced to set them here. */
if (sblock->fs_npsect < sblock->fs_nsect)
sblock->fs_npsect = sblock->fs_nsect;
if (sblock->fs_interleave < 1)
sblock->fs_interleave = 1;
if (sblock->fs_postblformat == FS_42POSTBLFMT)
sblock->fs_nrpos = 8;
if (sblock->fs_inodefmt < FS_44INODEFMT)
{
quad_t sizepb = sblock->fs_bsize;
int i;
oldformat = 1;
sblock->fs_maxfilesize = sblock->fs_bsize * NDADDR - 1;
for (i = 0; i < NIADDR; i++)
{
sizepb *= NINDIR (sblock);
sblock->fs_maxfilesize += sizepb;
}
sblock->fs_qbmask = ~sblock->fs_bmask;
sblock->fs_qfmask = ~sblock->fs_fmask;
}
/* Find out if we support the 4.4 symlink/dirtype extension */
if (sblock->fs_maxsymlinklen > 0)
direct_symlink_extension = 1;
else
direct_symlink_extension = 0;
csum = malloc (fsaddr (sblock, howmany (sblock->fs_cssize,
sblock->fs_fsize)));
assert (!diskfs_catch_exception ());
bcopy (disk_image + fsaddr (sblock, sblock->fs_csaddr),
csum,
fsaddr (sblock, howmany (sblock->fs_cssize, sblock->fs_fsize)));
diskfs_end_catch_exception ();
if ((diskfs_device_size << diskfs_log2_device_block_size)
< sblock->fs_size * sblock->fs_fsize)
{
fprintf (stderr,
"Disk size (%ld) less than necessary "
"(superblock says we need %ld)\n",
diskfs_device_size << diskfs_log2_device_block_size,
sblock->fs_size * sblock->fs_fsize);
exit (1);
}
vm_allocate (mach_task_self (), &zeroblock, sblock->fs_bsize, 1);
/* If the filesystem has new features in it, don't pay attention to
the user's request not to use them. */
if ((sblock->fs_inodefmt == FS_44INODEFMT
|| direct_symlink_extension)
&& compat_mode == COMPAT_BSD42)
/* XXX should syslog to this effect */
compat_mode = COMPAT_BSD44;
}
/* Write the csum data. This isn't backed by a pager because it is
taken from ordinary data blocks and might not be an even number
of pages; in that case writing it through the pager would nuke whatever
pages came after it on the disk and were backed by file pagers. */
void
diskfs_set_hypermetadata (int wait, int clean)
{
vm_address_t buf;
vm_size_t bufsize;
error_t err;
spin_lock (&alloclock);
if (!csum_dirty)
{
spin_unlock (&alloclock);
return;
}
/* Copy into a page-aligned buffer to avoid bugs in kernel device code. */
bufsize = round_page (fragroundup (sblock, sblock->fs_cssize));
err = diskfs_device_read_sync (fsbtodb (sblock, sblock->fs_csaddr),
&buf, bufsize);
if (!err)
{
bcopy (csum, (void *) buf, sblock->fs_cssize);
diskfs_device_write_sync (fsbtodb (sblock, sblock->fs_csaddr),
buf, bufsize);
csum_dirty = 0;
vm_deallocate (mach_task_self (), buf, bufsize);
}
spin_unlock (&alloclock);
}
/* Copy the sblock into the disk */
void
copy_sblock ()
{
error_t err;
int clean = 1; /* XXX wrong... */
err = diskfs_catch_exception ();
assert_perror (err);
spin_lock (&alloclock);
if (clean && !diskfs_readonly)
{
sblock->fs_clean = 1;
sblock_dirty = 1;
}
if (sblock_dirty)
{
if (sblock->fs_postblformat == FS_42POSTBLFMT
|| oldformat)
{
char sblockcopy[SBSIZE];
struct fs *sbcopy = (struct fs *)sblockcopy;
bcopy (sblock, sblockcopy, SBSIZE);
if (sblock->fs_postblformat == FS_42POSTBLFMT)
sbcopy->fs_nrpos = -1;
if (oldformat)
{
sbcopy->fs_maxfilesize = -1;
sbcopy->fs_qbmask = -1;
sbcopy->fs_qfmask = -1;
}
bcopy (sbcopy, disk_image + SBOFF, SBSIZE);
}
else
bcopy (sblock, disk_image + SBOFF, SBSIZE);
record_poke (disk_image + SBOFF, SBSIZE);
sblock_dirty = 0;
}
if (clean && !diskfs_readonly)
{
sblock->fs_clean = 0;
sblock_dirty = 1;
}
spin_unlock (&alloclock);
diskfs_end_catch_exception ();
}
void diskfs_readonly_changed (int readonly)
{
vm_protect (mach_task_self (),
(vm_address_t)disk_image,
diskfs_device_size << diskfs_log2_device_block_size,
0, VM_PROT_READ | (readonly ? 0 : VM_PROT_WRITE));
if (readonly)
sblock_dirty = 0;
else
{
sblock->fs_clean = 0;
strcpy (sblock->fs_fsmnt, "Hurd /"); /* XXX */
sblock_dirty = 1;
diskfs_set_hypermetadata (1, 0);
}
}
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