595 lines
16 KiB
C
595 lines
16 KiB
C
/* $NetBSD: filecore_vfsops.c,v 1.83 2020/03/16 21:20:10 pgoyette Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 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.
|
|
*
|
|
* filecore_vfsops.c 1.1 1998/6/26
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1998 Andrew McMurry
|
|
*
|
|
* 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 the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*
|
|
* filecore_vfsops.c 1.1 1998/6/26
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: filecore_vfsops.c,v 1.83 2020/03/16 21:20:10 pgoyette Exp $");
|
|
|
|
#if defined(_KERNEL_OPT)
|
|
#include "opt_compat_netbsd.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <miscfs/genfs/genfs.h>
|
|
#include <miscfs/specfs/specdev.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/file.h>
|
|
#include <sys/device.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/pool.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/kauth.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <fs/filecorefs/filecore.h>
|
|
#include <fs/filecorefs/filecore_extern.h>
|
|
#include <fs/filecorefs/filecore_node.h>
|
|
#include <fs/filecorefs/filecore_mount.h>
|
|
|
|
MODULE(MODULE_CLASS_VFS, filecore, NULL);
|
|
|
|
extern const struct vnodeopv_desc filecore_vnodeop_opv_desc;
|
|
|
|
const struct vnodeopv_desc * const filecore_vnodeopv_descs[] = {
|
|
&filecore_vnodeop_opv_desc,
|
|
NULL,
|
|
};
|
|
|
|
struct vfsops filecore_vfsops = {
|
|
.vfs_name = MOUNT_FILECORE,
|
|
.vfs_min_mount_data = sizeof (struct filecore_args),
|
|
.vfs_mount = filecore_mount,
|
|
.vfs_start = filecore_start,
|
|
.vfs_unmount = filecore_unmount,
|
|
.vfs_root = filecore_root,
|
|
.vfs_quotactl = (void *)eopnotsupp,
|
|
.vfs_statvfs = filecore_statvfs,
|
|
.vfs_sync = filecore_sync,
|
|
.vfs_vget = filecore_vget,
|
|
.vfs_loadvnode = filecore_loadvnode,
|
|
.vfs_fhtovp = filecore_fhtovp,
|
|
.vfs_vptofh = filecore_vptofh,
|
|
.vfs_init = filecore_init,
|
|
.vfs_reinit = filecore_reinit,
|
|
.vfs_done = filecore_done,
|
|
.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 = filecore_vnodeopv_descs
|
|
};
|
|
|
|
SYSCTL_SETUP(filecore_sysctl_setup, "filecore fs sysctl")
|
|
{
|
|
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "filecore",
|
|
SYSCTL_DESCR("Acorn FILECORE file system"),
|
|
NULL, 0, NULL, 0,
|
|
CTL_VFS, 19, CTL_EOL);
|
|
/*
|
|
* XXX the "19" above could be dynamic, thereby eliminating
|
|
* one more instance of the "number to vfs" mapping problem,
|
|
* but "19" is the order as taken from sys/mount.h
|
|
*/
|
|
}
|
|
|
|
static int
|
|
filecore_modcmd(modcmd_t cmd, void *arg)
|
|
{
|
|
int error;
|
|
|
|
switch (cmd) {
|
|
case MODULE_CMD_INIT:
|
|
error = vfs_attach(&filecore_vfsops);
|
|
if (error != 0)
|
|
break;
|
|
break;
|
|
case MODULE_CMD_FINI:
|
|
error = vfs_detach(&filecore_vfsops);
|
|
if (error != 0)
|
|
break;
|
|
break;
|
|
default:
|
|
error = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Called by vfs_mountroot when iso is going to be mounted as root.
|
|
*
|
|
* Name is updated by mount(8) after booting.
|
|
*/
|
|
|
|
static int filecore_mountfs(struct vnode *devvp, struct mount *mp,
|
|
struct lwp *l, struct filecore_args *argp);
|
|
|
|
#if 0
|
|
int
|
|
filecore_mountroot(void)
|
|
{
|
|
struct mount *mp;
|
|
extern struct vnode *rootvp;
|
|
struct proc *p = curproc; /* XXX */
|
|
int error;
|
|
struct filecore_args args;
|
|
|
|
if (device_class(root_device) != DV_DISK)
|
|
return (ENODEV);
|
|
|
|
/*
|
|
* Get vnodes for swapdev and rootdev.
|
|
*/
|
|
if (bdevvp(rootdev, &rootvp))
|
|
panic("filecore_mountroot: can't setup rootvp");
|
|
|
|
if ((error = vfs_rootmountalloc(MOUNT_FILECORE, "root_device", &mp)) != 0)
|
|
return (error);
|
|
|
|
args.flags = FILECOREMNT_ROOT;
|
|
if ((error = filecore_mountfs(rootvp, mp, p, &args)) != 0) {
|
|
vfs_unbusy(mp);
|
|
vfs_rele(mp);
|
|
return (error);
|
|
}
|
|
mountlist_append(mp);
|
|
(void)filecore_statvfs(mp, &mp->mnt_stat, p);
|
|
vfs_unbusy(mp);
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* VFS Operations.
|
|
*
|
|
* mount system call
|
|
*/
|
|
int
|
|
filecore_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
|
|
{
|
|
struct lwp *l = curlwp;
|
|
struct vnode *devvp;
|
|
struct filecore_args *args = data;
|
|
int error;
|
|
struct filecore_mnt *fcmp = NULL;
|
|
|
|
if (args == NULL)
|
|
return EINVAL;
|
|
if (*data_len < sizeof *args)
|
|
return EINVAL;
|
|
|
|
if (mp->mnt_flag & MNT_GETARGS) {
|
|
fcmp = VFSTOFILECORE(mp);
|
|
if (fcmp == NULL)
|
|
return EIO;
|
|
args->flags = fcmp->fc_mntflags;
|
|
args->uid = fcmp->fc_uid;
|
|
args->gid = fcmp->fc_gid;
|
|
args->fspec = NULL;
|
|
*data_len = sizeof *args;
|
|
return 0;
|
|
}
|
|
|
|
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
|
return (EROFS);
|
|
|
|
if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL)
|
|
return EINVAL;
|
|
|
|
/*
|
|
* Not an update, or updating the name: look up the name
|
|
* and verify that it refers to a sensible block device.
|
|
*/
|
|
error = namei_simple_user(args->fspec,
|
|
NSM_FOLLOW_NOEMULROOT, &devvp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (devvp->v_type != VBLK) {
|
|
vrele(devvp);
|
|
return ENOTBLK;
|
|
}
|
|
if (bdevsw_lookup(devvp->v_rdev) == NULL) {
|
|
vrele(devvp);
|
|
return ENXIO;
|
|
}
|
|
/*
|
|
* If mount by non-root, then verify that user has necessary
|
|
* permissions on the device.
|
|
*/
|
|
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(VREAD));
|
|
VOP_UNLOCK(devvp);
|
|
if (error) {
|
|
vrele(devvp);
|
|
return (error);
|
|
}
|
|
if ((mp->mnt_flag & MNT_UPDATE) == 0)
|
|
error = filecore_mountfs(devvp, mp, l, args);
|
|
else {
|
|
fcmp = VFSTOFILECORE(mp);
|
|
if (devvp != fcmp->fc_devvp)
|
|
error = EINVAL; /* needs translation */
|
|
else
|
|
vrele(devvp);
|
|
}
|
|
if (error) {
|
|
vrele(devvp);
|
|
return error;
|
|
}
|
|
fcmp = VFSTOFILECORE(mp);
|
|
return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
|
|
mp->mnt_op->vfs_name, mp, l);
|
|
}
|
|
|
|
/*
|
|
* Common code for mount and mountroot
|
|
*/
|
|
static int
|
|
filecore_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct filecore_args *argp)
|
|
{
|
|
struct filecore_mnt *fcmp = (struct filecore_mnt *)0;
|
|
struct buf *bp = NULL;
|
|
dev_t dev = devvp->v_rdev;
|
|
int error = EINVAL;
|
|
int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
|
|
struct filecore_disc_record *fcdr;
|
|
unsigned map;
|
|
unsigned log2secsize;
|
|
|
|
if (!ronly)
|
|
return EROFS;
|
|
|
|
if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0)
|
|
return (error);
|
|
|
|
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED);
|
|
VOP_UNLOCK(devvp);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Read the filecore boot block to check FS validity and to find the map */
|
|
error = bread(devvp, FILECORE_BOOTBLOCK_BLKN,
|
|
FILECORE_BOOTBLOCK_SIZE, 0, &bp);
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp,
|
|
FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE,
|
|
bp, error);
|
|
#endif
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
KASSERT(bp != NULL);
|
|
if (filecore_bbchecksum(bp->b_data) != 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) +
|
|
FILECORE_BB_DISCREC);
|
|
map = ((((8 << fcdr->log2secsize) - fcdr->zone_spare)
|
|
* (fcdr->nzones / 2) - 8 * FILECORE_DISCREC_SIZE)
|
|
<< fcdr->log2bpmb) >> fcdr->log2secsize;
|
|
log2secsize = fcdr->log2secsize;
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) vf1\n", bp);
|
|
#endif
|
|
brelse(bp, BC_AGE);
|
|
bp = NULL;
|
|
|
|
/* Read the bootblock in the map */
|
|
error = bread(devvp, map, 1 << log2secsize, 0, &bp);
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp,
|
|
map, 1 << log2secsize, bp, error);
|
|
#endif
|
|
if (error != 0)
|
|
goto out;
|
|
fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 4);
|
|
fcmp = kmem_zalloc(sizeof(*fcmp), KM_SLEEP);
|
|
if (fcdr->log2bpmb > fcdr->log2secsize)
|
|
fcmp->log2bsize = fcdr->log2bpmb;
|
|
else fcmp->log2bsize = fcdr->log2secsize;
|
|
fcmp->blksize = 1 << fcmp->log2bsize;
|
|
memcpy(&fcmp->drec, fcdr, sizeof(*fcdr));
|
|
fcmp->map = map;
|
|
fcmp->idspz = ((8 << fcdr->log2secsize) - fcdr->zone_spare)
|
|
/ (fcdr->idlen + 1);
|
|
fcmp->mask = (1 << fcdr->idlen) - 1;
|
|
if (fcdr->big_flag & 1) {
|
|
fcmp->nblks = ((((u_int64_t)fcdr->disc_size_2) << 32)
|
|
+ fcdr->disc_size) / fcmp->blksize;
|
|
} else {
|
|
fcmp->nblks=fcdr->disc_size / fcmp->blksize;
|
|
}
|
|
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) vf2\n", bp);
|
|
#endif
|
|
brelse(bp, BC_AGE);
|
|
bp = NULL;
|
|
|
|
mp->mnt_data = fcmp;
|
|
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
|
|
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FILECORE);
|
|
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
|
|
mp->mnt_stat.f_namemax = 10;
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
mp->mnt_dev_bshift = fcdr->log2secsize;
|
|
mp->mnt_fs_bshift = fcmp->log2bsize;
|
|
|
|
fcmp->fc_mountp = mp;
|
|
fcmp->fc_dev = dev;
|
|
fcmp->fc_devvp = devvp;
|
|
fcmp->fc_mntflags = argp->flags;
|
|
if (argp->flags & FILECOREMNT_USEUID) {
|
|
fcmp->fc_uid = kauth_cred_getuid(l->l_cred);
|
|
fcmp->fc_gid = kauth_cred_getgid(l->l_cred);
|
|
} else {
|
|
fcmp->fc_uid = argp->uid;
|
|
fcmp->fc_gid = argp->gid;
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
if (bp) {
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) vf3\n", bp);
|
|
#endif
|
|
brelse(bp, 0);
|
|
}
|
|
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
|
|
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED);
|
|
VOP_UNLOCK(devvp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Make a filesystem operational.
|
|
* Nothing to do at the moment.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_start(struct mount *mp, int flags)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* unmount system call
|
|
*/
|
|
int
|
|
filecore_unmount(struct mount *mp, int mntflags)
|
|
{
|
|
struct filecore_mnt *fcmp;
|
|
int error, flags = 0;
|
|
|
|
if (mntflags & MNT_FORCE)
|
|
flags |= FORCECLOSE;
|
|
if ((error = vflush(mp, NULLVP, flags)) != 0)
|
|
return (error);
|
|
|
|
fcmp = VFSTOFILECORE(mp);
|
|
|
|
if (fcmp->fc_devvp->v_type != VBAD)
|
|
spec_node_setmountedfs(fcmp->fc_devvp, NULL);
|
|
vn_lock(fcmp->fc_devvp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_CLOSE(fcmp->fc_devvp, FREAD, NOCRED);
|
|
vput(fcmp->fc_devvp);
|
|
kmem_free(fcmp, sizeof(*fcmp));
|
|
mp->mnt_data = NULL;
|
|
mp->mnt_flag &= ~MNT_LOCAL;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return root of a filesystem
|
|
*/
|
|
int
|
|
filecore_root(struct mount *mp, int lktype, struct vnode **vpp)
|
|
{
|
|
struct vnode *nvp;
|
|
int error;
|
|
|
|
if ((error = VFS_VGET(mp, FILECORE_ROOTINO, lktype, &nvp)) != 0)
|
|
return (error);
|
|
*vpp = nvp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Get file system statistics.
|
|
*/
|
|
int
|
|
filecore_statvfs(struct mount *mp, struct statvfs *sbp)
|
|
{
|
|
struct filecore_mnt *fcmp = VFSTOFILECORE(mp);
|
|
|
|
sbp->f_bsize = fcmp->blksize;
|
|
sbp->f_frsize = sbp->f_bsize; /* XXX */
|
|
sbp->f_iosize = sbp->f_bsize; /* XXX */
|
|
sbp->f_blocks = fcmp->nblks;
|
|
sbp->f_bfree = 0; /* total free blocks */
|
|
sbp->f_bavail = 0; /* blocks free for non superuser */
|
|
sbp->f_bresvd = 0; /* reserved blocks */
|
|
sbp->f_files = 0; /* total files */
|
|
sbp->f_ffree = 0; /* free file nodes for non superuser */
|
|
sbp->f_favail = 0; /* free file nodes */
|
|
sbp->f_fresvd = 0; /* reserved file nodes */
|
|
copy_statvfs_info(sbp, mp);
|
|
return 0;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* File handle to vnode
|
|
*
|
|
* Have to be really careful about stale file handles:
|
|
* - check that the inode number is in range
|
|
* - call iget() to get the locked inode
|
|
* - check for an unallocated inode (i_mode == 0)
|
|
* - check that the generation number matches
|
|
*/
|
|
|
|
struct ifid {
|
|
ushort ifid_len;
|
|
ushort ifid_pad;
|
|
u_int32_t ifid_ino;
|
|
};
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_fhtovp(struct mount *mp, struct fid *fhp, int lktype,
|
|
struct vnode **vpp)
|
|
{
|
|
struct ifid ifh;
|
|
struct vnode *nvp;
|
|
struct filecore_node *ip;
|
|
int error;
|
|
|
|
if (fhp->fid_len != sizeof(struct ifid))
|
|
return EINVAL;
|
|
|
|
memcpy(&ifh, fhp, sizeof(ifh));
|
|
if ((error = VFS_VGET(mp, ifh.ifid_ino, lktype, &nvp)) != 0) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
ip = VTOI(nvp);
|
|
if (filecore_staleinode(ip)) {
|
|
vput(nvp);
|
|
*vpp = NULLVP;
|
|
return (ESTALE);
|
|
}
|
|
*vpp = nvp;
|
|
return (0);
|
|
}
|
|
|
|
/* This looks complicated. Look at other vgets as well as the iso9660 one.
|
|
*
|
|
* The filecore inode number is made up of 1 byte directory entry index and
|
|
* 3 bytes of the internal disc address of the directory. On a read-only
|
|
* filesystem this is unique. For a read-write version we may not be able to
|
|
* do vget, see msdosfs.
|
|
*/
|
|
|
|
int
|
|
filecore_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp)
|
|
{
|
|
int error;
|
|
|
|
error = vcache_get(mp, &ino, sizeof(ino), vpp);
|
|
if (error)
|
|
return error;
|
|
error = vn_lock(*vpp, lktype);
|
|
if (error) {
|
|
vrele(*vpp);
|
|
*vpp = NULL;
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Vnode pointer to File handle
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
|
|
{
|
|
struct filecore_node *ip = VTOI(vp);
|
|
struct ifid ifh;
|
|
|
|
if (*fh_size < sizeof(struct ifid)) {
|
|
*fh_size = sizeof(struct ifid);
|
|
return E2BIG;
|
|
}
|
|
memset(&ifh, 0, sizeof(ifh));
|
|
ifh.ifid_len = sizeof(struct ifid);
|
|
ifh.ifid_ino = ip->i_number;
|
|
memcpy(fhp, &ifh, sizeof(ifh));
|
|
return 0;
|
|
}
|