freebsd-dev/sys/geom/label/g_label_ufs.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2002, 2003 Gordon Tetlow
* Copyright (c) 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ffs/ffs_extern.h>
#include <geom/geom.h>
#include <geom/label/g_label.h>
#define G_LABEL_UFS_VOLUME_DIR "ufs"
#define G_LABEL_UFS_ID_DIR "ufsid"
#define G_LABEL_UFS_VOLUME 0
#define G_LABEL_UFS_ID 1
/*
* G_LABEL_UFS_CMP returns true if difference between provider mediasize
* and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors
*/
#define G_LABEL_UFS_CMP(prov, fsys, size) \
( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \
< G_LABEL_UFS_MAXDIFF )
#define G_LABEL_UFS_MAXDIFF 0x100
/*
* Try to find a superblock on the provider. If successful, then
* check that the size in the superblock corresponds to the size
* of the underlying provider. Finally, look for a volume label
* and create an appropriate provider based on that.
*/
static void
g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what)
{
struct g_provider *pp;
struct fs *fs;
g_topology_assert_not();
pp = cp->provider;
label[0] = '\0';
fs = NULL;
if (SBLOCKSIZE % pp->sectorsize != 0 ||
This change is some refactoring of Mark Johnston's changes in r329375 to fix the memory leak that I introduced in r328426. Instead of trying to clear up the possible memory leak in all the clients, I ensure that it gets cleaned up in the source (e.g., ffs_sbget ensures that memory is always freed if it returns an error). The original change in r328426 was a bit sparse in its description. So I am expanding on its description here (thanks cem@ and rgrimes@ for your encouragement for my longer commit messages). In preparation for adding check hashing to superblocks, r328426 is a refactoring of the code to get the reading/writing of the superblock into one place. Unlike the cylinder group reading/writing which ends up in two places (ffs_getcg/ffs_geom_strategy in the kernel and cgget/cgput in libufs), I have the core superblock functions just in the kernel (ffs_sbfetch/ffs_sbput in ffs_subr.c which is already imported into utilities like fsck_ffs as well as libufs to implement sbget/sbput). The ffs_sbfetch and ffs_sbput functions take a function pointer to do the actual I/O for which there are four variants: ffs_use_bread / ffs_use_bwrite for the in-kernel filesystem g_use_g_read_data / g_use_g_write_data for kernel geom clients ufs_use_sa_read for the standalone code (stand/libsa/ufs.c but not stand/libsa/ufsread.c which is size constrained) use_pread / use_pwrite for libufs Uses of these interfaces are in the UFS filesystem, geoms journal & label, libsa changes, and libufs. They also permeate out into the filesystem utilities fsck_ffs, newfs, growfs, clri, dump, quotacheck, fsirand, fstyp, and quot. Some of these utilities should probably be converted to directly use libufs (like dumpfs was for example), but there does not seem to be much win in doing so. Tested by: Peter Holm (pho@)
2018-03-02 04:34:53 +00:00
ffs_sbget(cp, &fs, -1, M_GEOM, g_use_g_read_data) != 0) {
KASSERT(fs == NULL,
("g_label_ufs_taste_common: non-NULL fs %p\n", fs));
2006-02-18 03:04:26 +00:00
return;
}
/*
* Check for magic. We also need to check if file system size
* is almost equal to providers size, because sysinstall(8)
* used to bogusly put first partition at offset 0
* instead of 16, and glabel/ufs would find file system on slice
* instead of partition.
*
* In addition, media size can be a bit bigger than file system
* size. For instance, mkuzip can append bytes to align data
* to large sector size (it improves compression rates).
*/
if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
( G_LABEL_UFS_CMP(pp, fs, fs_old_size)
|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
/* Valid UFS1. */
} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
( G_LABEL_UFS_CMP(pp, fs, fs_size)
|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
/* Valid UFS2. */
} else {
goto out;
}
G_LABEL_DEBUG(1, "%s file system detected on %s.",
fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name);
switch (what) {
case G_LABEL_UFS_VOLUME:
/* Check for volume label */
if (fs->fs_volname[0] != '\0')
strlcpy(label, fs->fs_volname, size);
break;
case G_LABEL_UFS_ID:
if (fs->fs_id[0] != 0 || fs->fs_id[1] != 0)
snprintf(label, size, "%08x%08x", fs->fs_id[0],
fs->fs_id[1]);
break;
}
out:
g_free(fs->fs_csp);
g_free(fs);
}
static void
g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size)
{
g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME);
}
static void
g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size)
{
g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID);
}
struct g_label_desc g_label_ufs_volume = {
.ld_taste = g_label_ufs_volume_taste,
.ld_dir = G_LABEL_UFS_VOLUME_DIR,
.ld_enabled = 1
};
struct g_label_desc g_label_ufs_id = {
.ld_taste = g_label_ufs_id_taste,
.ld_dir = G_LABEL_UFS_ID_DIR,
.ld_enabled = 1
};
G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs");
G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names");
MODULE_DEPEND(g_label, ufs, 1, 1, 1);