FreeBSD-5.3/sys/fs/hpfs/hpfs_vfsops.c
/*-
* Copyright (c) 1998, 1999 Semen Ustimenko (semenu@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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD: src/sys/fs/hpfs/hpfs_vfsops.c,v 1.39 2004/07/30 22:08:49 phk Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <fs/hpfs/hpfs.h>
#include <fs/hpfs/hpfsmount.h>
#include <fs/hpfs/hpfs_subr.h>
MALLOC_DEFINE(M_HPFSMNT, "HPFS mount", "HPFS mount structure");
MALLOC_DEFINE(M_HPFSNO, "HPFS node", "HPFS node structure");
struct sockaddr;
static int hpfs_mountfs(register struct vnode *, struct mount *,
struct hpfs_args *, struct thread *);
static vfs_init_t hpfs_init;
static vfs_uninit_t hpfs_uninit;
static vfs_fhtovp_t hpfs_fhtovp;
static vfs_vget_t hpfs_vget;
static vfs_omount_t hpfs_omount;
static vfs_root_t hpfs_root;
static vfs_statfs_t hpfs_statfs;
static vfs_unmount_t hpfs_unmount;
static vfs_vptofh_t hpfs_vptofh;
static int
hpfs_init (
struct vfsconf *vcp )
{
dprintf(("hpfs_init():\n"));
hpfs_hphashinit();
return 0;
}
static int
hpfs_uninit (vfsp)
struct vfsconf *vfsp;
{
hpfs_hphashdestroy();
return 0;;
}
static int
hpfs_omount (
struct mount *mp,
char *path,
caddr_t data,
struct thread *td )
{
size_t size;
int err = 0;
struct vnode *devvp;
struct hpfs_args args;
struct hpfsmount *hpmp = 0;
struct nameidata ndp;
dprintf(("hpfs_omount():\n"));
/*
***
* Mounting non-root filesystem or updating a filesystem
***
*/
/* copy in user arguments*/
err = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
if (err)
goto error_1; /* can't get arguments*/
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
dprintf(("hpfs_omount: MNT_UPDATE: "));
hpmp = VFSTOHPFS(mp);
if (args.fspec == 0) {
dprintf(("export 0x%x\n",args.export.ex_flags));
err = vfs_export(mp, &args.export);
if (err) {
printf("hpfs_omount: vfs_export failed %d\n",
err);
}
goto success;
} else {
dprintf(("name [FAILED]\n"));
err = EINVAL;
goto success;
}
dprintf(("\n"));
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
NDINIT(&ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td);
err = namei(&ndp);
if (err) {
/* can't get devvp!*/
goto error_1;
}
devvp = ndp.ni_vp;
if (!vn_isdisk(devvp, &err))
goto error_2;
/*
********************
* NEW MOUNT
********************
*/
/*
* Since this is a new mount, we want the names for
* the device and the mount point copied in. If an
* error occurs, the mountpoint is discarded by the
* upper level code. Note that vfs_omount() handles
* copying the mountpoint f_mntonname for us, so we
* don't have to do it here unless we want to set it
* to something other than "path" for some rason.
*/
/* Save "mounted from" info for mount point (NULL pad)*/
copyinstr( args.fspec, /* device name*/
mp->mnt_stat.f_mntfromname, /* save area*/
MNAMELEN - 1, /* max size*/
&size); /* real size*/
bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
err = hpfs_mountfs(devvp, mp, &args, td);
if (err)
goto error_2;
/*
* Initialize FS stat information in mount struct; uses both
* mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
*
* This code is common to root and non-root mounts
*/
(void)VFS_STATFS(mp, &mp->mnt_stat, td);
goto success;
error_2: /* error with devvp held*/
/* release devvp before failing*/
vrele(devvp);
error_1: /* no state to back out*/
/* XXX: Missing NDFREE(&ndp, ...) */
success:
return( err);
}
/*
* Common code for mount and mountroot
*/
int
hpfs_mountfs(devvp, mp, argsp, td)
register struct vnode *devvp;
struct mount *mp;
struct hpfs_args *argsp;
struct thread *td;
{
int error, ncount, ronly;
struct sublock *sup;
struct spblock *spp;
struct hpfsmount *hpmp;
struct buf *bp = NULL;
struct vnode *vp;
struct cdev *dev = devvp->v_rdev;
dprintf(("hpfs_mountfs():\n"));
/*
* Disallow multiple mounts of the same device.
* Disallow mounting of a device that is currently in use
* (except for root, which might share swap device for miniroot).
* Flush out any old buffers remaining from a previous use.
*/
error = vfs_mountedon(devvp);
if (error)
return (error);
ncount = vcount(devvp);
if (devvp->v_object)
ncount -= 1;
if (ncount > 1)
return (EBUSY);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0);
VOP_UNLOCK(devvp, 0, td);
if (error)
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td, -1);
VOP_UNLOCK(devvp, 0, td);
if (error)
return (error);
/*
* Do actual mount
*/
hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
/* Read in SuperBlock */
error = bread(devvp, SUBLOCK, SUSIZE, NOCRED, &bp);
if (error)
goto failed;
bcopy(bp->b_data, &hpmp->hpm_su, sizeof(struct sublock));
brelse(bp); bp = NULL;
/* Read in SpareBlock */
error = bread(devvp, SPBLOCK, SPSIZE, NOCRED, &bp);
if (error)
goto failed;
bcopy(bp->b_data, &hpmp->hpm_sp, sizeof(struct spblock));
brelse(bp); bp = NULL;
sup = &hpmp->hpm_su;
spp = &hpmp->hpm_sp;
/* Check magic */
if (sup->su_magic != SU_MAGIC) {
printf("hpfs_mountfs: SuperBlock MAGIC DOESN'T MATCH\n");
error = EINVAL;
goto failed;
}
if (spp->sp_magic != SP_MAGIC) {
printf("hpfs_mountfs: SpareBlock MAGIC DOESN'T MATCH\n");
error = EINVAL;
goto failed;
}
mp->mnt_data = (qaddr_t)hpmp;
hpmp->hpm_devvp = devvp;
hpmp->hpm_dev = devvp->v_rdev;
hpmp->hpm_mp = mp;
hpmp->hpm_uid = argsp->uid;
hpmp->hpm_gid = argsp->gid;
hpmp->hpm_mode = argsp->mode;
error = hpfs_bminit(hpmp);
if (error)
goto failed;
error = hpfs_cpinit(hpmp, argsp);
if (error) {
hpfs_bmdeinit(hpmp);
goto failed;
}
error = hpfs_root(mp, &vp, td);
if (error) {
hpfs_cpdeinit(hpmp);
hpfs_bmdeinit(hpmp);
goto failed;
}
vput(vp);
mp->mnt_stat.f_fsid.val[0] = (long)dev2udev(dev);
mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
mp->mnt_maxsymlinklen = 0;
mp->mnt_flag |= MNT_LOCAL;
devvp->v_rdev->si_mountpoint = mp;
return (0);
failed:
if (bp)
brelse (bp);
mp->mnt_data = (qaddr_t)NULL;
devvp->v_rdev->si_mountpoint = NULL;
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, td);
return (error);
}
static int
hpfs_unmount(
struct mount *mp,
int mntflags,
struct thread *td)
{
int error, flags, ronly;
register struct hpfsmount *hpmp = VFSTOHPFS(mp);
dprintf(("hpfs_unmount():\n"));
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
flags = 0;
if(mntflags & MNT_FORCE)
flags |= FORCECLOSE;
dprintf(("hpfs_unmount: vflushing...\n"));
error = vflush(mp, 0, flags, td);
if (error) {
printf("hpfs_unmount: vflush failed: %d\n",error);
return (error);
}
hpmp->hpm_devvp->v_rdev->si_mountpoint = NULL;
vinvalbuf(hpmp->hpm_devvp, V_SAVE, NOCRED, td, 0, 0);
error = VOP_CLOSE(hpmp->hpm_devvp, ronly ? FREAD : FREAD|FWRITE,
NOCRED, td);
vrele(hpmp->hpm_devvp);
dprintf(("hpfs_umount: freeing memory...\n"));
hpfs_cpdeinit(hpmp);
hpfs_bmdeinit(hpmp);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
FREE(hpmp, M_HPFSMNT);
return (0);
}
static int
hpfs_root(
struct mount *mp,
struct vnode **vpp,
struct thread *td )
{
int error = 0;
struct hpfsmount *hpmp = VFSTOHPFS(mp);
dprintf(("hpfs_root():\n"));
error = VFS_VGET(mp, (ino_t)hpmp->hpm_su.su_rootfno, LK_EXCLUSIVE, vpp);
if(error) {
printf("hpfs_root: VFS_VGET failed: %d\n",error);
return (error);
}
return (error);
}
static int
hpfs_statfs(
struct mount *mp,
struct statfs *sbp,
struct thread *td)
{
struct hpfsmount *hpmp = VFSTOHPFS(mp);
dprintf(("hpfs_statfs(): HPFS%d.%d\n",
hpmp->hpm_su.su_hpfsver, hpmp->hpm_su.su_fnctver));
sbp->f_type = mp->mnt_vfc->vfc_typenum;
sbp->f_bsize = DEV_BSIZE;
sbp->f_iosize = DEV_BSIZE;
sbp->f_blocks = hpmp->hpm_su.su_btotal;
sbp->f_bfree = sbp->f_bavail = hpmp->hpm_bavail;
sbp->f_ffree = 0;
sbp->f_files = 0;
if (sbp != &mp->mnt_stat) {
bcopy((caddr_t)mp->mnt_stat.f_mntonname,
(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
}
sbp->f_flags = mp->mnt_flag;
return (0);
}
/*ARGSUSED*/
static int
hpfs_fhtovp(
struct mount *mp,
struct fid *fhp,
struct vnode **vpp)
{
struct vnode *nvp;
struct hpfid *hpfhp = (struct hpfid *)fhp;
int error;
if ((error = VFS_VGET(mp, hpfhp->hpfid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
*vpp = NULLVP;
return (error);
}
/* XXX as unlink/rmdir/mkdir/creat are not currently possible
* with HPFS, we don't need to check anything else for now */
*vpp = nvp;
return (0);
}
static int
hpfs_vptofh(
struct vnode *vp,
struct fid *fhp)
{
register struct hpfsnode *hpp;
register struct hpfid *hpfhp;
hpp = VTOHP(vp);
hpfhp = (struct hpfid *)fhp;
hpfhp->hpfid_len = sizeof(struct hpfid);
hpfhp->hpfid_ino = hpp->h_no;
/* hpfhp->hpfid_gen = hpp->h_gen; */
return (0);
}
static int
hpfs_vget(
struct mount *mp,
ino_t ino,
int flags,
struct vnode **vpp)
{
struct hpfsmount *hpmp = VFSTOHPFS(mp);
struct vnode *vp;
struct hpfsnode *hp;
struct buf *bp;
struct thread *td = curthread; /* XXX */
int error;
dprintf(("hpfs_vget(0x%x): ",ino));
*vpp = NULL;
hp = NULL;
vp = NULL;
if ((error = hpfs_hphashvget(hpmp->hpm_dev, ino, flags, vpp, td)) != 0)
return (error);
if (*vpp != NULL) {
dprintf(("hashed\n"));
return (0);
}
/*
* We have to lock node creation for a while,
* but then we have to call getnewvnode(),
* this may cause hpfs_reclaim() to be called,
* this may need to VOP_VGET() parent dir for
* update reasons, and if parent is not in
* hash, we have to lock node creation...
* To solve this, we MALLOC, getnewvnode and init while
* not locked (probability of node appearence
* at that time is little, and anyway - we'll
* check for it).
*/
MALLOC(hp, struct hpfsnode *, sizeof(struct hpfsnode),
M_HPFSNO, M_WAITOK);
error = getnewvnode("hpfs", hpmp->hpm_mp, hpfs_vnodeop_p, &vp);
if (error) {
printf("hpfs_vget: can't get new vnode\n");
FREE(hp, M_HPFSNO);
return (error);
}
dprintf(("prenew "));
vp->v_data = hp;
if (ino == (ino_t)hpmp->hpm_su.su_rootfno)
vp->v_vflag |= VV_ROOT;
mtx_init(&hp->h_interlock, "hpfsnode interlock", NULL, MTX_DEF);
hp->h_flag = H_INVAL;
hp->h_vp = vp;
hp->h_hpmp = hpmp;
hp->h_no = ino;
hp->h_dev = hpmp->hpm_dev;
hp->h_uid = hpmp->hpm_uid;
hp->h_gid = hpmp->hpm_uid;
hp->h_mode = hpmp->hpm_mode;
hp->h_devvp = hpmp->hpm_devvp;
VREF(hp->h_devvp);
error = vn_lock(vp, LK_EXCLUSIVE, td);
if (error) {
vput(vp);
return (error);
}
do {
if ((error =
hpfs_hphashvget(hpmp->hpm_dev, ino, flags, vpp, td))) {
vput(vp);
return (error);
}
if (*vpp != NULL) {
dprintf(("hashed2\n"));
vput(vp);
return (0);
}
} while(lockmgr(&hpfs_hphash_lock,LK_EXCLUSIVE|LK_SLEEPFAIL,NULL,NULL));
hpfs_hphashins(hp);
lockmgr(&hpfs_hphash_lock, LK_RELEASE, NULL, NULL);
error = bread(hpmp->hpm_devvp, ino, FNODESIZE, NOCRED, &bp);
if (error) {
printf("hpfs_vget: can't read ino %d\n",ino);
vput(vp);
return (error);
}
bcopy(bp->b_data, &hp->h_fn, sizeof(struct fnode));
brelse(bp);
if (hp->h_fn.fn_magic != FN_MAGIC) {
printf("hpfs_vget: MAGIC DOESN'T MATCH\n");
vput(vp);
return (EINVAL);
}
vp->v_type = hp->h_fn.fn_flag ? VDIR:VREG;
hp->h_flag &= ~H_INVAL;
*vpp = vp;
return (0);
}
static struct vfsops hpfs_vfsops = {
.vfs_fhtovp = hpfs_fhtovp,
.vfs_init = hpfs_init,
.vfs_omount = hpfs_omount,
.vfs_root = hpfs_root,
.vfs_statfs = hpfs_statfs,
.vfs_uninit = hpfs_uninit,
.vfs_unmount = hpfs_unmount,
.vfs_vget = hpfs_vget,
.vfs_vptofh = hpfs_vptofh,
};
VFS_SET(hpfs_vfsops, hpfs, 0);