/* $NetBSD: ext2fs_vfsops.c,v 1.229 2025/02/16 16:34:01 joe Exp $ */

/* $NetBSD: ext2fs_vfsops.c,v 1.229 2025/02/16 16:34:01 joe Exp $ */

/*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. 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.
* 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94
* Modified for ext2fs by Manuel Bouyer.
*/

/*
* Copyright (c) 1997 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.
*
* 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.
*
* @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94
* Modified for ext2fs by Manuel Bouyer.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.229 2025/02/16 16:34:01 joe Exp $");

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/pool.h>
#include <sys/lock.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <sys/module.h>

#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufs_extern.h>

#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_dir.h>
#include <ufs/ext2fs/ext2fs_extern.h>

MODULE(MODULE_CLASS_VFS, ext2fs, "ufs");

int ext2fs_sbupdate(struct ufsmount *, int);
static int ext2fs_sbfill(struct m_ext2fs *, int);

extern const struct vnodeopv_desc ext2fs_vnodeop_opv_desc;
extern const struct vnodeopv_desc ext2fs_specop_opv_desc;
extern const struct vnodeopv_desc ext2fs_fifoop_opv_desc;

const struct vnodeopv_desc * const ext2fs_vnodeopv_descs[] = {
&ext2fs_vnodeop_opv_desc,
&ext2fs_specop_opv_desc,
&ext2fs_fifoop_opv_desc,
NULL,
};

struct vfsops ext2fs_vfsops = {
.vfs_name = MOUNT_EXT2FS,
.vfs_min_mount_data = sizeof (struct ufs_args),
.vfs_mount = ext2fs_mount,
.vfs_start = ufs_start,
.vfs_unmount = ext2fs_unmount,
.vfs_root = ufs_root,
.vfs_quotactl = ufs_quotactl,
.vfs_statvfs = ext2fs_statvfs,
.vfs_sync = ext2fs_sync,
.vfs_vget = ufs_vget,
.vfs_loadvnode = ext2fs_loadvnode,
.vfs_newvnode = ext2fs_newvnode,
.vfs_fhtovp = ext2fs_fhtovp,
.vfs_vptofh = ext2fs_vptofh,
.vfs_init = ext2fs_init,
.vfs_reinit = ext2fs_reinit,
.vfs_done = ext2fs_done,
.vfs_mountroot = ext2fs_mountroot,
.vfs_snapshot = (void *)eopnotsupp,
.vfs_extattrctl = vfs_stdextattrctl,
.vfs_suspendctl = genfs_suspendctl,
.vfs_renamelock_enter = genfs_renamelock_enter,
.vfs_renamelock_exit = genfs_renamelock_exit,
.vfs_fsync = (void *)eopnotsupp,
.vfs_opv_descs = ext2fs_vnodeopv_descs
};

static const struct genfs_ops ext2fs_genfsops = {
.gop_size = genfs_size,
.gop_alloc = ext2fs_gop_alloc,
.gop_write = genfs_gop_write,
.gop_markupdate = ufs_gop_markupdate,
.gop_putrange = genfs_gop_putrange,
};

static const struct ufs_ops ext2fs_ufsops = {
.uo_itimes = ext2fs_itimes,
.uo_update = ext2fs_update,
.uo_bufrd = ext2fs_bufrd,
.uo_bufwr = ext2fs_bufwr,
};

static void
e2fs_cgload(const char *ondisk, struct ext2_gd *inmemory, int cg_size,
int shift_cg_entry_size)
{

if (shift_cg_entry_size == 6) {
memcpy(inmemory, ondisk, cg_size);
return;
}

const char *iptr = ondisk;
struct ext2_gd *optr = inmemory;
int sh = 1 << shift_cg_entry_size;
int lim = cg_size >> shift_cg_entry_size;
if (shift_cg_entry_size > 6) {
for (int i = 0; i < lim; i++, optr++, iptr += sh) {
memcpy(optr, iptr, sizeof(*optr));
}
} else {
for (int i = 0; i < lim; i++, optr++, iptr += sh) {
memcpy(optr, iptr, E2FS_REV0_GD_SIZE);
memset((char *)optr + E2FS_REV0_GD_SIZE, 0,
sizeof(*optr) - E2FS_REV0_GD_SIZE);
}
}
}

static void
e2fs_cgsave(const struct ext2_gd *inmemory, char *ondisk, int cg_size,
int shift_cg_entry_size)
{

if (shift_cg_entry_size == 6) {
memcpy(ondisk, inmemory, cg_size);
return;
}

const struct ext2_gd *iptr = inmemory;
char *optr = ondisk;
int sh = 1 << shift_cg_entry_size;
int lim = cg_size >> shift_cg_entry_size;
if (shift_cg_entry_size > 6) {
for (int i = 0; i < lim; i++, iptr++, optr += sh) {
memcpy(optr, iptr, sizeof(*iptr));
memset(optr + sizeof(*iptr), 0, sh - sizeof(*iptr));
}
} else {
for (int i = 0; i < lim; i++, iptr++, optr += sh) {
memcpy(optr, iptr, E2FS_REV0_GD_SIZE);
}
}
}

/* Fill in the inode uid/gid from ext2 halves. */
void
ext2fs_set_inode_guid(struct inode *ip)
{

ip->i_gid = ip->i_e2fs_gid;
ip->i_uid = ip->i_e2fs_uid;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) {
ip->i_gid |= ip->i_e2fs_gid_high << 16;
ip->i_uid |= ip->i_e2fs_uid_high << 16;
}
}

SYSCTL_SETUP(ext2fs_sysctl_setup, "ext2fs sysctl")
{

sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "ext2fs",
SYSCTL_DESCR("Linux EXT2FS file system"),
NULL, 0, NULL, 0,
CTL_VFS, 17, CTL_EOL);
/*
* XXX the "17" above could be dynamic, thereby eliminating
* one more instance of the "number to vfs" mapping problem,
* but "17" is the order as taken from sys/mount.h
*/
}

static int
ext2fs_modcmd(modcmd_t cmd, void *arg)
{
int error;

switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&ext2fs_vfsops);
break;
case MODULE_CMD_FINI:
error = vfs_detach(&ext2fs_vfsops);
break;
default:
error = ENOTTY;
break;
}

return error;
}

/*
* XXX Same structure as FFS inodes? Should we share a common pool?
*/
struct pool ext2fs_inode_pool;

extern u_long ext2gennumber;

void
ext2fs_init(void)
{

pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0,
"ext2fsinopl", &pool_allocator_nointr, IPL_NONE);
ufs_init();
}

void
ext2fs_reinit(void)
{
ufs_reinit();
}

void
ext2fs_done(void)
{

ufs_done();
pool_destroy(&ext2fs_inode_pool);
}

static void
ext2fs_sb_setmountinfo(struct m_ext2fs *fs, struct mount *mp)
{
(void)strlcpy(fs->e2fs_fsmnt, mp->mnt_stat.f_mntonname,
sizeof(fs->e2fs_fsmnt));
if (fs->e2fs_ronly == 0 && fs->e2fs.e2fs_rev > E2FS_REV0) {
(void)strlcpy(fs->e2fs.e2fs_fsmnt, mp->mnt_stat.f_mntonname,
sizeof(fs->e2fs.e2fs_fsmnt));

fs->e2fs.e2fs_mtime = time_second;
fs->e2fs.e2fs_mnt_count++;

fs->e2fs_fmod = 1;
}
}

/*
* Called by main() when ext2fs is going to be mounted as root.
*
* Name is updated by mount(8) after booting.
*/

int
ext2fs_mountroot(void)
{
extern struct vnode *rootvp;
struct m_ext2fs *fs;
struct mount *mp;
struct ufsmount *ump;
int error;

if (device_class(root_device) != DV_DISK)
return ENODEV;

if ((error = vfs_rootmountalloc(MOUNT_EXT2FS, "root_device", &mp))) {
vrele(rootvp);
return error;
}

if ((error = ext2fs_mountfs(rootvp, mp)) != 0) {
vfs_unbusy(mp);
vfs_rele(mp);
return error;
}
mountlist_append(mp);
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
ext2fs_sb_setmountinfo(fs, mp);
(void)ext2fs_statvfs(mp, &mp->mnt_stat);
vfs_unbusy(mp);
setrootfstime((time_t)fs->e2fs.e2fs_wtime);
return 0;
}

/*
* VFS Operations.
*
* mount system call
*/
int
ext2fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct vnode *devvp;
struct ufs_args *args = data;
struct ufsmount *ump = NULL;
struct m_ext2fs *fs;
int error = 0, flags, update;
mode_t accessmode;

if (args == NULL)
return EINVAL;
if (*data_len < sizeof *args)
return EINVAL;

if (mp->mnt_flag & MNT_GETARGS) {
ump = VFSTOUFS(mp);
if (ump == NULL)
return EIO;
memset(args, 0, sizeof *args);
args->fspec = NULL;
*data_len = sizeof *args;
return 0;
}

update = mp->mnt_flag & MNT_UPDATE;

/* Check arguments */
if (args->fspec != NULL) {
/*
* Look up the name and verify that it's sane.
*/
error = namei_simple_user(args->fspec,
NSM_FOLLOW_NOEMULROOT, &devvp);
if (error != 0)
return error;

if (!update) {
/*
* Be sure this is a valid block device
*/
if (devvp->v_type != VBLK)
error = ENOTBLK;
else if (bdevsw_lookup(devvp->v_rdev) == NULL)
error = ENXIO;
} else {
/*
* Be sure we're still naming the same device
* used for our initial mount
*/
ump = VFSTOUFS(mp);
if (devvp != ump->um_devvp) {
if (devvp->v_rdev != ump->um_devvp->v_rdev)
error = EINVAL;
else {
vrele(devvp);
devvp = ump->um_devvp;
vref(devvp);
}
}
}
} else {
if (!update) {
/* New mounts must have a filename for the device */
return EINVAL;
} else {
ump = VFSTOUFS(mp);
devvp = ump->um_devvp;
vref(devvp);
}
}

/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*
* Permission to update a mount is checked higher, so here we presume
* updating the mount is okay (for example, as far as securelevel goes)
* which leaves us with the normal check.
*/
if (error == 0) {
accessmode = VREAD;
if (update ?
(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
(mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
KAUTH_ARG(accessmode));
VOP_UNLOCK(devvp);
}

if (error) {
vrele(devvp);
return error;
}

if (!update) {
int xflags;

if (mp->mnt_flag & MNT_RDONLY)
xflags = FREAD;
else
xflags = FREAD|FWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_OPEN(devvp, xflags, FSCRED);
VOP_UNLOCK(devvp);
if (error)
goto fail;
error = ext2fs_mountfs(devvp, mp);
if (error) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
(void)VOP_CLOSE(devvp, xflags, NOCRED);
VOP_UNLOCK(devvp);
goto fail;
}

ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
} else {
/*
* Update the mount.
*/

/*
* The initial mount got a reference on this
* device, so drop the one obtained via
* namei(), above.
*/
vrele(devvp);

ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
/*
* Changing from r/w to r/o
*/
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = ext2fs_flushfiles(mp, flags);
if (error == 0 &&
ext2fs_cgupdate(ump, MNT_WAIT) == 0 &&
(fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) {
fs->e2fs.e2fs_state = E2FS_ISCLEAN;
(void) ext2fs_sbupdate(ump, MNT_WAIT);
}
if (error)
return error;
fs->e2fs_ronly = 1;
}

if (mp->mnt_flag & MNT_RELOAD) {
error = ext2fs_reload(mp, l->l_cred, l);
if (error)
return error;
}

if (fs->e2fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) {
/*
* Changing from read-only to read/write
*/
fs->e2fs_ronly = 0;
if (fs->e2fs.e2fs_state == E2FS_ISCLEAN)
fs->e2fs.e2fs_state = 0;
else
fs->e2fs.e2fs_state = E2FS_ERRORS;
fs->e2fs_fmod = 1;
}
if (args->fspec == NULL)
return 0;
}

error = set_statvfs_info(path, UIO_USERSPACE, args->fspec,
UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
if (error == 0)
ext2fs_sb_setmountinfo(fs, mp);

if (fs->e2fs_fmod != 0) { /* XXX */
fs->e2fs_fmod = 0;
if (fs->e2fs.e2fs_state == 0)
fs->e2fs.e2fs_wtime = time_second;
else
printf("%s: file system not clean; please fsck(8)\n",
mp->mnt_stat.f_mntfromname);
(void) ext2fs_cgupdate(ump, MNT_WAIT);
}
return error;

fail:
vrele(devvp);
return error;
}

/*
* Sanity check the disk vnode content, and copy it over to inode structure.
*/
static int
ext2fs_loadvnode_content(struct m_ext2fs *fs, ino_t ino, struct buf *bp, struct inode *ip)
{
struct ext2fs_dinode *din;
int error = 0;

din = (struct ext2fs_dinode *)((char *)bp->b_data +
(ino_to_fsbo(fs, ino) * EXT2_DINODE_SIZE(fs)));

/* sanity checks - inode data NOT byteswapped at this point */
if (EXT2_DINODE_FITS(din, e2di_extra_isize, EXT2_DINODE_SIZE(fs))
&& (EXT2_DINODE_SIZE(fs) - EXT2_REV0_DINODE_SIZE)
< fs2h16(din->e2di_extra_isize))
{
printf("ext2fs: inode %"PRIu64" bad extra_isize %u",
ino, din->e2di_extra_isize);
error = EINVAL;
goto bad;
}

/* everything alright, proceed with copy */
if (ip->i_din.e2fs_din == NULL)
ip->i_din.e2fs_din = kmem_alloc(EXT2_DINODE_SIZE(fs), KM_SLEEP);

e2fs_iload(din, ip->i_din.e2fs_din, EXT2_DINODE_SIZE(fs));

ext2fs_set_inode_guid(ip);

bad:
return error;
}

/*
* Reload all incore data for a filesystem (used after running fsck on
* the root filesystem and finding things to fix). The filesystem must
* be mounted read-only.
*
* Things to do to update the mount:
* 1) invalidate all cached meta-data.
* 2) re-read superblock from disk.
* 3) re-read summary information from disk.
* 4) invalidate all inactive vnodes.
* 5) invalidate all cached file data.
* 6) re-read inode data for all active vnodes.
*/
int
ext2fs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l)
{
struct vnode *vp, *devvp;
struct inode *ip;
struct buf *bp;
struct m_ext2fs *fs;
struct ext2fs *newfs;
int i, error;
struct ufsmount *ump;
struct vnode_iterator *marker;

if ((mp->mnt_flag & MNT_RDONLY) == 0)
return EINVAL;

ump = VFSTOUFS(mp);
/*
* Step 1: invalidate all cached meta-data.
*/
devvp = ump->um_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = vinvalbuf(devvp, 0, cred, l, 0, 0);
VOP_UNLOCK(devvp);
if (error)
panic("ext2fs_reload: dirty1");

fs = ump->um_e2fs;
/*
* Step 2: re-read superblock from disk. Copy in new superblock, and
* compute in-memory values.
*/
error = bread(devvp, SBLOCK, SBSIZE, 0, &bp);
if (error)
return error;
newfs = (struct ext2fs *)bp->b_data;
e2fs_sbload(newfs, &fs->e2fs);

brelse(bp, 0);

error = ext2fs_sbfill(fs, (mp->mnt_flag & MNT_RDONLY) != 0);
if (error)
return error;

/*
* Step 3: re-read summary information from disk.
*/
for (i = 0; i < fs->e2fs_ngdb; i++) {
error = bread(devvp ,
EXT2_FSBTODB(fs, fs->e2fs.e2fs_first_dblock +
1 /* superblock */ + i),
fs->e2fs_bsize, 0, &bp);
if (error) {
return error;
}
e2fs_cgload(bp->b_data,
&fs->e2fs_gd[i *
(fs->e2fs_bsize >> fs->e2fs_group_desc_shift)],
fs->e2fs_bsize, fs->e2fs_group_desc_shift);
brelse(bp, 0);
}

vfs_vnode_iterator_init(mp, &marker);
while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) {
/*
* Step 4: invalidate all inactive vnodes.
*/
if (vrecycle(vp))
continue;
/*
* Step 5: invalidate all cached file data.
*/
if (vn_lock(vp, LK_EXCLUSIVE)) {
vrele(vp);
continue;
}
if (vinvalbuf(vp, 0, cred, l, 0, 0))
panic("ext2fs_reload: dirty2");
/*
* Step 6: re-read inode data for all active vnodes.
*/
ip = VTOI(vp);
error = bread(devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)),
(int)fs->e2fs_bsize, 0, &bp);
if (error) {
vput(vp);
break;
}
error = ext2fs_loadvnode_content(fs, ip->i_number, bp, ip);
brelse(bp, 0);
if (error) {
vput(vp);
break;
}

vput(vp);
}
vfs_vnode_iterator_destroy(marker);
return error;
}

/*
* Common code for mount and mountroot
*/
int
ext2fs_mountfs(struct vnode *devvp, struct mount *mp)
{
struct lwp *l = curlwp;
struct ufsmount *ump;
struct buf *bp;
struct ext2fs *fs;
struct m_ext2fs *m_fs;
dev_t dev;
int error, i, ronly;
kauth_cred_t cred;

dev = devvp->v_rdev;
cred = l->l_cred;

/* Flush out any old buffers remaining from a previous use. */
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0);
VOP_UNLOCK(devvp);
if (error)
return error;

ronly = (mp->mnt_flag & MNT_RDONLY) != 0;

bp = NULL;
ump = NULL;

/* Read the superblock from disk, and swap it directly. */
error = bread(devvp, SBLOCK, SBSIZE, 0, &bp);
if (error)
goto out;
fs = (struct ext2fs *)bp->b_data;
m_fs = kmem_zalloc(sizeof(*m_fs), KM_SLEEP);
e2fs_sbload(fs, &m_fs->e2fs);

brelse(bp, 0);
bp = NULL;

/* Once swapped, validate and fill in the superblock. */
error = ext2fs_sbfill(m_fs, ronly);
if (error) {
kmem_free(m_fs, sizeof(*m_fs));
goto out;
}
m_fs->e2fs_ronly = ronly;

ump = kmem_zalloc(sizeof(*ump), KM_SLEEP);
ump->um_fstype = UFS1;
ump->um_ops = &ext2fs_ufsops;
ump->um_e2fs = m_fs;

if (ronly == 0) {
if (m_fs->e2fs.e2fs_state == E2FS_ISCLEAN)
m_fs->e2fs.e2fs_state = 0;
else
m_fs->e2fs.e2fs_state = E2FS_ERRORS;
m_fs->e2fs_fmod = 1;
}

int32_t sh = m_fs->e2fs_bsize >> m_fs->e2fs_group_desc_shift;
/* XXX: should be added in ext2fs_sbfill()? */
m_fs->e2fs_gd = kmem_alloc(m_fs->e2fs_ngdb * sh
* sizeof(struct ext2_gd), KM_SLEEP);
for (i = 0; i < m_fs->e2fs_ngdb; i++) {
error = bread(devvp,
EXT2_FSBTODB(m_fs, m_fs->e2fs.e2fs_first_dblock +
1 /* superblock */ + i),
m_fs->e2fs_bsize, 0, &bp);
if (error)
goto out1;
e2fs_cgload(bp->b_data, &m_fs->e2fs_gd[i *
(m_fs->e2fs_bsize >> m_fs->e2fs_group_desc_shift)],
m_fs->e2fs_bsize, m_fs->e2fs_group_desc_shift);
brelse(bp, 0);
bp = NULL;
}

error = ext2fs_cg_verify_and_initialize(devvp, m_fs, ronly);
if (error)
goto out1;

mp->mnt_data = ump;
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_EXT2FS);
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
mp->mnt_stat.f_namemax = EXT2FS_MAXNAMLEN;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_dev_bshift = DEV_BSHIFT; /* XXX */
mp->mnt_fs_bshift = m_fs->e2fs_bshift;
mp->mnt_iflag |= IMNT_DTYPE | IMNT_SHRLOOKUP;
ump->um_flags = 0;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_nindir = EXT2_NINDIR(m_fs);
ump->um_lognindir = ffs(EXT2_NINDIR(m_fs)) - 1;
ump->um_bptrtodb = m_fs->e2fs_fsbtodb;
ump->um_seqinc = 1; /* no frags */
ump->um_maxsymlinklen = EXT2_MAXSYMLINKLEN;
ump->um_dirblksiz = m_fs->e2fs_bsize;
ump->um_maxfilesize = ((uint64_t)0x80000000 * m_fs->e2fs_bsize - 1);
spec_node_setmountedfs(devvp, mp);
return 0;

out1:
kmem_free(m_fs->e2fs_gd, m_fs->e2fs_ngdb * sh * sizeof(struct ext2_gd));
out:
if (bp != NULL)
brelse(bp, 0);
if (ump) {
kmem_free(ump->um_e2fs, sizeof(*m_fs));
kmem_free(ump, sizeof(*ump));
mp->mnt_data = NULL;
}
return error;
}

/*
* unmount system call
*/
int
ext2fs_unmount(struct mount *mp, int mntflags)
{
struct ufsmount *ump;
struct m_ext2fs *fs;
int error, flags;

flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if ((error = ext2fs_flushfiles(mp, flags)) != 0)
return error;
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs_ronly == 0 &&
ext2fs_cgupdate(ump, MNT_WAIT) == 0 &&
(fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) {
fs->e2fs.e2fs_state = E2FS_ISCLEAN;
(void) ext2fs_sbupdate(ump, MNT_WAIT);
}
if (ump->um_devvp->v_type != VBAD)
spec_node_setmountedfs(ump->um_devvp, NULL);
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE,
NOCRED);
vput(ump->um_devvp);
int32_t sh = fs->e2fs_bsize >> fs->e2fs_group_desc_shift;
kmem_free(fs->e2fs_gd, fs->e2fs_ngdb * sh * sizeof(struct ext2_gd));
kmem_free(fs, sizeof(*fs));
kmem_free(ump, sizeof(*ump));
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return error;
}

/*
* Flush out all the files in a filesystem.
*/
int
ext2fs_flushfiles(struct mount *mp, int flags)
{
extern int doforce;
int error;

if (!doforce)
flags &= ~FORCECLOSE;
error = vflush(mp, NULLVP, flags);
return error;
}

/*
* Get file system statistics.
*/
int
ext2fs_statvfs(struct mount *mp, struct statvfs *sbp)
{
struct ufsmount *ump;
struct m_ext2fs *fs;
uint32_t overhead, overhead_per_group, ngdb;
int i, ngroups;

ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs.e2fs_magic != E2FS_MAGIC)
panic("ext2fs_statvfs");

/*
* Compute the overhead (FS structures)
*/
overhead_per_group =
1 /* block bitmap */ +
1 /* inode bitmap */ +
fs->e2fs_itpg;
overhead = fs->e2fs.e2fs_first_dblock +
fs->e2fs_ncg * overhead_per_group;
if (EXT2F_HAS_COMPAT_FEATURE(fs, EXT2F_COMPAT_SPARSESUPER2)) {
/*
* Superblock and group descriptions is in group zero,
* then optionally 0, 1 or 2 extra copies.
*/
ngroups = 1
+ (fs->e2fs.e4fs_backup_bgs[0] ? 1 : 0)
+ (fs->e2fs.e4fs_backup_bgs[1] ? 1 : 0);
} else if (EXT2F_HAS_ROCOMPAT_FEATURE(fs, EXT2F_ROCOMPAT_SPARSESUPER)) {
for (i = 0, ngroups = 0; i < fs->e2fs_ncg; i++) {
if (cg_has_sb(i))
ngroups++;
}
} else {
ngroups = fs->e2fs_ncg;
}
ngdb = fs->e2fs_ngdb;
if (EXT2F_HAS_COMPAT_FEATURE(fs, EXT2F_COMPAT_RESIZE))
ngdb += fs->e2fs.e2fs_reserved_ngdb;
overhead += ngroups * (1 /* superblock */ + ngdb);

sbp->f_bsize = fs->e2fs_bsize;
sbp->f_frsize = MINBSIZE << fs->e2fs.e2fs_fsize;
sbp->f_iosize = fs->e2fs_bsize;
sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead;
sbp->f_bfree = fs->e2fs.e2fs_fbcount;
sbp->f_bresvd = fs->e2fs.e2fs_rbcount;
if (sbp->f_bfree > sbp->f_bresvd)
sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd;
else
sbp->f_bavail = 0;
sbp->f_files = fs->e2fs.e2fs_icount;
sbp->f_ffree = fs->e2fs.e2fs_ficount;
sbp->f_favail = fs->e2fs.e2fs_ficount;
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
return 0;
}

static bool
ext2fs_sync_selector(void *cl, struct vnode *vp)
{
struct inode *ip;

KASSERT(mutex_owned(vp->v_interlock));

ip = VTOI(vp);
/*
* Skip the vnode/inode if inaccessible.
*/
if (ip == NULL || vp->v_type == VNON)
return false;

if (((ip->i_flag &
(IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 &&
LIST_EMPTY(&vp->v_dirtyblkhd) &&
(vp->v_iflag & VI_ONWORKLST) == 0))
return false;
return true;
}

/*
* Go through the disk queues to initiate sandbagged IO;
* go through the inodes to write those that have been modified;
* initiate the writing of the super block if it has been modified.
*/
int
ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct vnode *vp;
struct ufsmount *ump = VFSTOUFS(mp);
struct m_ext2fs *fs;
struct vnode_iterator *marker;
int error, allerror = 0;

fs = ump->um_e2fs;
if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->e2fs_fsmnt);
panic("update: rofs mod");
}

/*
* Write back each (modified) inode.
*/
vfs_vnode_iterator_init(mp, &marker);
while ((vp = vfs_vnode_iterator_next(marker, ext2fs_sync_selector,
NULL)))
{
error = vn_lock(vp, LK_EXCLUSIVE);
if (error) {
vrele(vp);
continue;
}
if (vp->v_type == VREG && waitfor == MNT_LAZY)
error = ext2fs_update(vp, NULL, NULL, 0);
else
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
}
vfs_vnode_iterator_destroy(marker);
/*
* Force stale file system control information to be flushed.
*/
if (waitfor != MNT_LAZY) {
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_FSYNC(ump->um_devvp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0)
allerror = error;
VOP_UNLOCK(ump->um_devvp);
}
/*
* Write back modified superblock.
*/
if (fs->e2fs_fmod != 0) {
fs->e2fs_fmod = 0;
fs->e2fs.e2fs_wtime = time_second;
if ((error = ext2fs_cgupdate(ump, waitfor)))
allerror = error;
}
return allerror;
}

/*
* Load inode from disk and initialize vnode.
*/
static int
ext2fs_init_vnode(struct ufsmount *ump, struct vnode *vp, ino_t ino)
{
struct m_ext2fs *fs;
struct inode *ip;
struct buf *bp;
int error;

fs = ump->um_e2fs;

/* Read in the disk contents for the inode, copy into the inode. */
error = bread(ump->um_devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ino)),
(int)fs->e2fs_bsize, 0, &bp);
if (error)
return error;

/* Allocate and initialize inode. */
ip = pool_get(&ext2fs_inode_pool, PR_WAITOK);
memset(ip, 0, sizeof(struct inode));
ip->i_vnode = vp;
ip->i_ump = ump;
ip->i_e2fs = fs;
ip->i_dev = ump->um_dev;
ip->i_number = ino;
ip->i_e2fs_last_lblk = 0;
ip->i_e2fs_last_blk = 0;

error = ext2fs_loadvnode_content(fs, ino, bp, ip);
brelse(bp, 0);
if (error) {
pool_put(&ext2fs_inode_pool, ip);
return error;
}

/* If the inode was deleted, reset all fields */
if (ip->i_e2fs_dtime != 0) {
ip->i_e2fs_mode = 0;
(void)ext2fs_setsize(ip, 0);
(void)ext2fs_setnblock(ip, 0);
memset(ip->i_e2fs_blocks, 0, sizeof(ip->i_e2fs_blocks));
}

/* Initialise vnode with this inode. */
vp->v_tag = VT_EXT2FS;
vp->v_op = ext2fs_vnodeop_p;
vp->v_data = ip;

/* Initialize genfs node. */
genfs_node_init(vp, &ext2fs_genfsops);

return 0;
}

/*
* Read an inode from disk and initialize this vnode / inode pair.
* Caller assures no other thread will try to load this inode.
*/
int
ext2fs_loadvnode(struct mount *mp, struct vnode *vp,
const void *key, size_t key_len, const void **new_key)
{
ino_t ino;
struct inode *ip;
struct ufsmount *ump;
int error;

KASSERT(key_len == sizeof(ino));
memcpy(&ino, key, key_len);
ump = VFSTOUFS(mp);

error = ext2fs_init_vnode(ump, vp, ino);
if (error)
return error;

ip = VTOI(vp);

/* Initialize the vnode from the inode. */
ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp);

/* Finish inode initialization. */
ip->i_devvp = ump->um_devvp;
vref(ip->i_devvp);

/*
* Set up a generation number for this inode if it does not
* already have one. This should only happen on old filesystems.
*/

if (ip->i_e2fs_gen == 0) {
if (++ext2gennumber < (u_long)time_second)
ext2gennumber = time_second;
ip->i_e2fs_gen = ext2gennumber;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
ip->i_flag |= IN_MODIFIED;
}
uvm_vnp_setsize(vp, ext2fs_size(ip));
*new_key = &ip->i_number;
return 0;
}

/*
* Create a new inode on disk and initialize this vnode / inode pair.
*/
int
ext2fs_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp,
struct vattr *vap, kauth_cred_t cred, void *extra,
size_t *key_len, const void **new_key)
{
ino_t ino;
struct inode *ip, *pdir;
struct m_ext2fs *fs;
struct ufsmount *ump;
int error, mode;

KASSERT(dvp->v_mount == mp);
KASSERT(vap->va_type != VNON);

*key_len = sizeof(ino);

pdir = VTOI(dvp);
fs = pdir->i_e2fs;
ump = VFSTOUFS(mp);
mode = MAKEIMODE(vap->va_type, vap->va_mode);

/* Allocate fresh inode. */
error = ext2fs_valloc(dvp, mode, cred, &ino);
if (error)
return error;

/* Attach inode to vnode. */
error = ext2fs_init_vnode(ump, vp, ino);
if (error) {
ext2fs_vfree(dvp, ino, mode);
return error;
}

ip = VTOI(vp);

KASSERT(!E2FS_HAS_GD_CSUM(fs) ||
(fs->e2fs_gd[ino_to_cg(fs, ino)].ext2bgd_flags &
h2fs16(E2FS_BG_INODE_ZEROED)) != 0);

/* check for already used inode; makes sense only for ZEROED itable */
if (__predict_false(ip->i_e2fs_mode && ip->i_e2fs_nlink != 0)) {
printf("mode = 0%o, nlinks %d, inum = %llu, fs = %s\n",
ip->i_e2fs_mode, ip->i_e2fs_nlink,
(unsigned long long)ip->i_number, fs->e2fs_fsmnt);
panic("ext2fs_valloc: dup alloc");
}

memset(ip->i_din.e2fs_din, 0, EXT2_DINODE_SIZE(fs));

/*
* Set up a new generation number for this inode.
*/
if (++ext2gennumber < time_second)
ext2gennumber = time_second;
ip->i_e2fs_gen = ext2gennumber;

ip->i_uid = kauth_cred_geteuid(cred);
ip->i_e2fs_uid = ip->i_uid & 0xffff;
ip->i_e2fs_gid = pdir->i_e2fs_gid;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) {
ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff;
ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high;
} else {
ip->i_e2fs_uid_high = 0;
ip->i_e2fs_gid_high = 0;
}
ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16);
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_e2fs_mode = mode;
vp->v_type = IFTOVT(mode);
ip->i_e2fs_nlink = 1;

/* Authorize setting SGID if needed. */
if (ip->i_e2fs_mode & ISGID) {
error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY,
vp, NULL, genfs_can_chmod(vp, cred, ip->i_uid, ip->i_gid,
mode));
if (error)
ip->i_e2fs_mode &= ~ISGID;
}

/* Initialize extra_isize according to what is set in superblock */
if (EXT2F_HAS_ROCOMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_EXTRA_ISIZE)
&& EXT2_DINODE_SIZE(ip->i_e2fs) > EXT2_REV0_DINODE_SIZE) {
ip->i_din.e2fs_din->e2di_extra_isize =
ip->i_e2fs->e2fs.e4fs_want_extra_isize;
}

/* Set create time if possible */
if (EXT2_DINODE_FITS(ip->i_din.e2fs_din, e2di_crtime,
EXT2_DINODE_SIZE(ip->i_e2fs))) {
struct timespec now;
vfs_timestamp(&now);
EXT2_DINODE_TIME_SET(&now, ip->i_din.e2fs_din, e2di_crtime,
EXT2_DINODE_SIZE(ip->i_e2fs));
}

/* Initialize the vnode from the inode. */
ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp);

/* Finish inode initialization. */
ip->i_devvp = ump->um_devvp;
vref(ip->i_devvp);

uvm_vnp_setsize(vp, ext2fs_size(ip));
*new_key = &ip->i_number;
return 0;
}

/*
* File handle to vnode
*
* Have to be really careful about stale file handles:
* - check that the inode number is valid
* - call ext2fs_vget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
*/
int
ext2fs_fhtovp(struct mount *mp, struct fid *fhp, int lktype, struct vnode **vpp)
{
struct inode *ip;
struct vnode *nvp;
int error;
struct ufid ufh;
struct m_ext2fs *fs;

if (fhp->fid_len != sizeof(struct ufid))
return EINVAL;

memcpy(&ufh, fhp, sizeof(struct ufid));
fs = VFSTOUFS(mp)->um_e2fs;
if ((ufh.ufid_ino < EXT2_FIRSTINO && ufh.ufid_ino != EXT2_ROOTINO) ||
ufh.ufid_ino >= fs->e2fs_ncg * fs->e2fs.e2fs_ipg)
return ESTALE;

if ((error = VFS_VGET(mp, ufh.ufid_ino, lktype, &nvp)) != 0) {
*vpp = NULLVP;
return error;
}
ip = VTOI(nvp);
if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0 ||
ip->i_e2fs_gen != ufh.ufid_gen) {
vput(nvp);
*vpp = NULLVP;
return ESTALE;
}
*vpp = nvp;
return 0;
}

/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
ext2fs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
{
struct inode *ip;
struct ufid ufh;

if (*fh_size < sizeof(struct ufid)) {
*fh_size = sizeof(struct ufid);
return E2BIG;
}
*fh_size = sizeof(struct ufid);

ip = VTOI(vp);
memset(&ufh, 0, sizeof(ufh));
ufh.ufid_len = sizeof(struct ufid);
ufh.ufid_ino = ip->i_number;
ufh.ufid_gen = ip->i_e2fs_gen;
memcpy(fhp, &ufh, sizeof(ufh));
return 0;
}

/*
* Write a superblock and associated information back to disk.
*/
int
ext2fs_sbupdate(struct ufsmount *mp, int waitfor)
{
struct m_ext2fs *fs = mp->um_e2fs;
struct buf *bp;
int error = 0;

bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
e2fs_sbsave(&fs->e2fs, (struct ext2fs*)bp->b_data);
if (waitfor == MNT_WAIT)
error = bwrite(bp);
else
bawrite(bp);
return error;
}

int
ext2fs_cgupdate(struct ufsmount *mp, int waitfor)
{
struct m_ext2fs *fs = mp->um_e2fs;
struct buf *bp;
int i, error = 0, allerror = 0;

allerror = ext2fs_sbupdate(mp, waitfor);
for (i = 0; i < fs->e2fs_ngdb; i++) {
bp = getblk(mp->um_devvp, EXT2_FSBTODB(fs,
fs->e2fs.e2fs_first_dblock +
1 /* superblock */ + i), fs->e2fs_bsize, 0, 0);
e2fs_cgsave(&fs->e2fs_gd[i *
(fs->e2fs_bsize >> fs->e2fs_group_desc_shift)],
bp->b_data, fs->e2fs_bsize, fs->e2fs_group_desc_shift);
if (waitfor == MNT_WAIT)
error = bwrite(bp);
else
bawrite(bp);
}

if (!allerror && error)
allerror = error;
return allerror;
}

/*
* Fill in the m_fs structure, and validate the fields of the superblock.
* NOTE: here, the superblock is already swapped.
*/
static int
ext2fs_sbfill(struct m_ext2fs *m_fs, int ronly)
{
uint32_t u32;
struct ext2fs *fs = &m_fs->e2fs;

/*
* General sanity checks
*/
if (fs->e2fs_magic != E2FS_MAGIC)
return EINVAL;
if (fs->e2fs_rev > E2FS_REV1) {
printf("ext2fs: unsupported revision number: %#x\n",
fs->e2fs_rev);
return EINVAL;
}
if (fs->e2fs_log_bsize > 2) {
/* block size = 1024|2048|4096 */
printf("ext2fs: bad block size: %d\n", fs->e2fs_log_bsize);
return EINVAL;
}
if (fs->e2fs_bpg == 0) {
printf("ext2fs: zero blocks per group\n");
return EINVAL;
}
if (fs->e2fs_ipg == 0) {
printf("ext2fs: zero inodes per group\n");
return EINVAL;
}

if (fs->e2fs_first_dblock >= fs->e2fs_bcount) {
printf("ext2fs: invalid first data block\n");
return EINVAL;
}
if (fs->e2fs_rbcount > fs->e2fs_bcount ||
fs->e2fs_fbcount > fs->e2fs_bcount) {
printf("ext2fs: invalid block count\n");
return EINVAL;
}

/*
* Compute the fields of the superblock
*/
u32 = fs->e2fs_bcount - fs->e2fs_first_dblock; /* > 0 */
m_fs->e2fs_ncg = howmany(u32, fs->e2fs_bpg);
if (m_fs->e2fs_ncg == 0) {
printf("ext2fs: invalid number of cylinder groups\n");
return EINVAL;
}

m_fs->e2fs_fsbtodb = fs->e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT;
m_fs->e2fs_bsize = MINBSIZE << fs->e2fs_log_bsize;
m_fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs_log_bsize;
m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1;
m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask;

if (!(fs->e2fs_features_incompat & EXT2F_INCOMPAT_64BIT) ||
(fs->e2fs_rev == E2FS_REV0))
m_fs->e2fs_group_desc_shift = 5;
else {
for (m_fs->e2fs_group_desc_shift = 0;
(1 << m_fs->e2fs_group_desc_shift)
< fs->e3fs_desc_size;
m_fs->e2fs_group_desc_shift++);
}

if ((u32 = (m_fs->e2fs_bsize >> m_fs->e2fs_group_desc_shift)) == 0) {
/* Unlikely to happen */
printf("ext2fs: invalid block size\n");
return EINVAL;
}
m_fs->e2fs_ngdb = howmany(m_fs->e2fs_ncg, u32);
if (m_fs->e2fs_ngdb == 0) {
printf("ext2fs: invalid number of group descriptor blocks\n");
return EINVAL;
}

if (m_fs->e2fs_bsize < EXT2_DINODE_SIZE(m_fs)) {
printf("ext2fs: invalid inode size\n");
return EINVAL;
}
m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE(m_fs);

m_fs->e2fs_itpg = fs->e2fs_ipg / m_fs->e2fs_ipb;

/*
* Revision-specific checks
*/
if (fs->e2fs_rev > E2FS_REV0) {
char buf[256];
if (fs->e2fs_first_ino != EXT2_FIRSTINO) {
printf("ext2fs: unsupported first inode position\n");
return EINVAL;
}
u32 = fs->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP;
if (u32) {
snprintb(buf, sizeof(buf), EXT2F_INCOMPAT_BITS, u32);
printf("ext2fs: unsupported incompat features: %s\n",
buf);
#ifndef EXT2_IGNORE_INCOMPAT_FEATURES
return EINVAL;
#endif
}
u32 = fs->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP;
if (!ronly && u32) {
snprintb(buf, sizeof(buf), EXT2F_ROCOMPAT_BITS, u32);
printf("ext2fs: unsupported ro-incompat features: %s\n",
buf);
#ifndef EXT2_IGNORE_ROCOMPAT_FEATURES
return EROFS;
#endif
}
if (fs->e2fs_inode_size == 0 || !powerof2(fs->e2fs_inode_size) || fs->e2fs_inode_size > m_fs->e2fs_bsize) {
printf("ext2fs: bad inode size\n");
return EINVAL;
}
}

return 0;
}