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NetBSD/sys/ufs/ffs/ffs_bswap.c
hannken 8c21bc6224 Add ffs internal snapshots. Written by Marshall Kirk McKusick for FreeBSD. 
- Not enabled by default. Needs kernel option FFS_SNAPSHOT.
- Change parameters of ffs_blkfree.
- Let the copy-on-write functions return an error so spec_strategy
    may fail if the copy-on-write fails.
- Change genfs_*lock*() to use vp->v_vnlock instead of &vp->v_lock.
- Add flag B_METAONLY to VOP_BALLOC to return indirect block buffer.
- Add a function ffs_checkfreefile needed for snapshot creation.
- Add special handling of snapshot files:
    Snapshots may not be opened for writing and the attributes are read-only.
    Use the mtime as the time this snapshot was taken.
    Deny mtime updates for snapshot files.
- Add function transferlockers to transfer any waiting processes from
  one lock to another.
- Add vfsop VFS_SNAPSHOT to take a snapshot and make it accessible through
  a vnode.
- Add snapshot support to ls, fsck_ffs and dump.

Welcome to 2.0F.

Approved by: Jason R. Thorpe <thorpej@netbsd.org>
2004-05-25 14:54:55 +00:00

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/* $NetBSD: ffs_bswap.c,v 1.28 2004/05/25 14:54:59 hannken Exp $ */
/*
* Copyright (c) 1998 Manuel Bouyer.
*
* 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 Manuel Bouyer.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_bswap.c,v 1.28 2004/05/25 14:54:59 hannken Exp $");
#include <sys/param.h>
#if defined(_KERNEL)
#include <sys/systm.h>
#endif
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#if !defined(_KERNEL)
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define panic(x) printf("%s\n", (x)), abort()
#endif
void
ffs_sb_swap(struct fs *o, struct fs *n)
{
int i;
u_int32_t *o32, *n32;
/*
* In order to avoid a lot of lines, as the first N fields (52)
* of the superblock up to fs_fmod are u_int32_t, we just loop
* here to convert them.
*/
o32 = (u_int32_t *)o;
n32 = (u_int32_t *)n;
for (i = 0; i < offsetof(struct fs, fs_fmod) / sizeof(u_int32_t); i++)
n32[i] = bswap32(o32[i]);
n->fs_swuid = bswap64(o->fs_swuid);
n->fs_cgrotor = bswap32(o->fs_cgrotor); /* Unused */
n->fs_old_cpc = bswap32(o->fs_old_cpc);
/* These fields overlap with a possible location for the
* historic FS_DYNAMICPOSTBLFMT postbl table, and with the
* first half of the historic FS_42POSTBLFMT postbl table.
*/
n->fs_maxbsize = bswap32(o->fs_maxbsize);
n->fs_sblockloc = bswap64(o->fs_sblockloc);
ffs_csumtotal_swap(&o->fs_cstotal, &n->fs_cstotal);
n->fs_time = bswap64(o->fs_time);
n->fs_size = bswap64(o->fs_size);
n->fs_dsize = bswap64(o->fs_dsize);
n->fs_csaddr = bswap64(o->fs_csaddr);
n->fs_pendingblocks = bswap64(o->fs_pendingblocks);
n->fs_pendinginodes = bswap32(o->fs_pendinginodes);
/* These fields overlap with the second half of the
* historic FS_42POSTBLFMT postbl table
*/
for (i = 0; i < FSMAXSNAP; i++)
n->fs_snapinum[i] = bswap32(o->fs_snapinum[i]);
n->fs_avgfilesize = bswap32(o->fs_avgfilesize);
n->fs_avgfpdir = bswap32(o->fs_avgfpdir);
/* fs_sparecon[28] - ignore for now */
n->fs_flags = bswap32(o->fs_flags);
n->fs_contigsumsize = bswap32(o->fs_contigsumsize);
n->fs_maxsymlinklen = bswap32(o->fs_maxsymlinklen);
n->fs_old_inodefmt = bswap32(o->fs_old_inodefmt);
n->fs_maxfilesize = bswap64(o->fs_maxfilesize);
n->fs_qbmask = bswap64(o->fs_qbmask);
n->fs_qfmask = bswap64(o->fs_qfmask);
n->fs_state = bswap32(o->fs_state);
n->fs_old_postblformat = bswap32(o->fs_old_postblformat);
n->fs_old_nrpos = bswap32(o->fs_old_nrpos);
n->fs_old_postbloff = bswap32(o->fs_old_postbloff);
n->fs_old_rotbloff = bswap32(o->fs_old_rotbloff);
n->fs_magic = bswap32(o->fs_magic);
}
void
ffs_dinode1_swap(struct ufs1_dinode *o, struct ufs1_dinode *n)
{
n->di_mode = bswap16(o->di_mode);
n->di_nlink = bswap16(o->di_nlink);
n->di_u.oldids[0] = bswap16(o->di_u.oldids[0]);
n->di_u.oldids[1] = bswap16(o->di_u.oldids[1]);
n->di_size = bswap64(o->di_size);
n->di_atime = bswap32(o->di_atime);
n->di_atimensec = bswap32(o->di_atimensec);
n->di_mtime = bswap32(o->di_mtime);
n->di_mtimensec = bswap32(o->di_mtimensec);
n->di_ctime = bswap32(o->di_ctime);
n->di_ctimensec = bswap32(o->di_ctimensec);
memcpy(n->di_db, o->di_db, (NDADDR + NIADDR) * sizeof(u_int32_t));
n->di_flags = bswap32(o->di_flags);
n->di_blocks = bswap32(o->di_blocks);
n->di_gen = bswap32(o->di_gen);
n->di_uid = bswap32(o->di_uid);
n->di_gid = bswap32(o->di_gid);
}
void
ffs_dinode2_swap(struct ufs2_dinode *o, struct ufs2_dinode *n)
{
n->di_mode = bswap16(o->di_mode);
n->di_nlink = bswap16(o->di_nlink);
n->di_uid = bswap32(o->di_uid);
n->di_gid = bswap32(o->di_gid);
n->di_blksize = bswap32(o->di_blksize);
n->di_size = bswap64(o->di_size);
n->di_blocks = bswap64(o->di_blocks);
n->di_atime = bswap64(o->di_atime);
n->di_atimensec = bswap32(o->di_atimensec);
n->di_mtime = bswap64(o->di_mtime);
n->di_mtimensec = bswap32(o->di_mtimensec);
n->di_ctime = bswap64(o->di_ctime);
n->di_ctimensec = bswap32(o->di_ctimensec);
n->di_birthtime = bswap64(o->di_ctime);
n->di_birthnsec = bswap32(o->di_ctimensec);
n->di_gen = bswap32(o->di_gen);
n->di_kernflags = bswap32(o->di_kernflags);
n->di_flags = bswap32(o->di_flags);
n->di_extsize = bswap32(o->di_extsize);
memcpy(n->di_extb, o->di_extb, (NXADDR + NDADDR + NIADDR) * 8);
}
void
ffs_csum_swap(struct csum *o, struct csum *n, int size)
{
int i;
u_int32_t *oint, *nint;
oint = (u_int32_t*)o;
nint = (u_int32_t*)n;
for (i = 0; i < size / sizeof(u_int32_t); i++)
nint[i] = bswap32(oint[i]);
}
void
ffs_csumtotal_swap(struct csum_total *o, struct csum_total *n)
{
n->cs_ndir = bswap64(o->cs_ndir);
n->cs_nbfree = bswap64(o->cs_nbfree);
n->cs_nifree = bswap64(o->cs_nifree);
n->cs_nffree = bswap64(o->cs_nffree);
}
/*
* Note that ffs_cg_swap may be called with o == n.
*/
void
ffs_cg_swap(struct cg *o, struct cg *n, struct fs *fs)
{
int i;
u_int32_t *n32, *o32;
u_int16_t *n16, *o16;
int32_t btotoff, boff, clustersumoff;
n->cg_firstfield = bswap32(o->cg_firstfield);
n->cg_magic = bswap32(o->cg_magic);
n->cg_old_time = bswap32(o->cg_old_time);
n->cg_cgx = bswap32(o->cg_cgx);
n->cg_old_ncyl = bswap16(o->cg_old_ncyl);
n->cg_old_niblk = bswap16(o->cg_old_niblk);
n->cg_ndblk = bswap32(o->cg_ndblk);
n->cg_cs.cs_ndir = bswap32(o->cg_cs.cs_ndir);
n->cg_cs.cs_nbfree = bswap32(o->cg_cs.cs_nbfree);
n->cg_cs.cs_nifree = bswap32(o->cg_cs.cs_nifree);
n->cg_cs.cs_nffree = bswap32(o->cg_cs.cs_nffree);
n->cg_rotor = bswap32(o->cg_rotor);
n->cg_frotor = bswap32(o->cg_frotor);
n->cg_irotor = bswap32(o->cg_irotor);
for (i = 0; i < MAXFRAG; i++)
n->cg_frsum[i] = bswap32(o->cg_frsum[i]);
if ((fs->fs_magic != FS_UFS2_MAGIC) &&
(fs->fs_old_postblformat == FS_42POSTBLFMT)) { /* old format */
struct ocg *on, *oo;
int j;
on = (struct ocg *)n;
oo = (struct ocg *)o;
for (i = 0; i < 32; i++) {
on->cg_btot[i] = bswap32(oo->cg_btot[i]);
for (j = 0; j < 8; j++)
on->cg_b[i][j] = bswap16(oo->cg_b[i][j]);
}
memmove(on->cg_iused, oo->cg_iused, 256);
on->cg_magic = bswap32(oo->cg_magic);
} else { /* new format */
n->cg_old_btotoff = bswap32(o->cg_old_btotoff);
n->cg_old_boff = bswap32(o->cg_old_boff);
n->cg_iusedoff = bswap32(o->cg_iusedoff);
n->cg_freeoff = bswap32(o->cg_freeoff);
n->cg_nextfreeoff = bswap32(o->cg_nextfreeoff);
n->cg_clustersumoff = bswap32(o->cg_clustersumoff);
n->cg_clusteroff = bswap32(o->cg_clusteroff);
n->cg_nclusterblks = bswap32(o->cg_nclusterblks);
n->cg_niblk = bswap32(o->cg_niblk);
n->cg_initediblk = bswap32(o->cg_initediblk);
n->cg_time = bswap64(o->cg_time);
if (fs->fs_magic == FS_UFS2_MAGIC)
return;
if (n->cg_magic == CG_MAGIC) {
btotoff = n->cg_old_btotoff;
boff = n->cg_old_boff;
clustersumoff = n->cg_clustersumoff;
} else {
btotoff = bswap32(n->cg_old_btotoff);
boff = bswap32(n->cg_old_boff);
clustersumoff = bswap32(n->cg_clustersumoff);
}
n32 = (u_int32_t *)((u_int8_t *)n + btotoff);
o32 = (u_int32_t *)((u_int8_t *)o + btotoff);
n16 = (u_int16_t *)((u_int8_t *)n + boff);
o16 = (u_int16_t *)((u_int8_t *)o + boff);
for (i = 0; i < fs->fs_old_cpg; i++)
n32[i] = bswap32(o32[i]);
for (i = 0; i < fs->fs_old_cpg * fs->fs_old_nrpos; i++)
n16[i] = bswap16(o16[i]);
n32 = (u_int32_t *)((u_int8_t *)n + clustersumoff);
o32 = (u_int32_t *)((u_int8_t *)o + clustersumoff);
for (i = 1; i < fs->fs_contigsumsize + 1; i++)
n32[i] = bswap32(o32[i]);
}
}
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