freebsd-dev/sys/fs/hpfs/hpfs_vfsops.c
Tor Egge 5da56ddb21 Use mount interlock to protect all changes to mnt_flag and mnt_kern_flag.
This eliminates a race where MNT_UPDATE flag could be lost when nmount()
raced against sync(), sync_fsync() or quotactl().
2006-09-26 04:12:49 +00:00

556 lines
12 KiB
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.
*
* $FreeBSD$
*/
#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 <geom/geom.h>
#include <geom/geom_vfs.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 thread *);
static vfs_fhtovp_t hpfs_fhtovp;
static vfs_vget_t hpfs_vget;
static vfs_cmount_t hpfs_cmount;
static vfs_mount_t hpfs_mount;
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_cmount (
struct mntarg *ma,
void *data,
int flags,
struct thread *td )
{
struct hpfs_args args;
int error;
error = copyin(data, (caddr_t)&args, sizeof (struct hpfs_args));
if (error)
return (error);
ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
ma = mount_arg(ma, "export", &args.export, sizeof args.export);
ma = mount_argf(ma, "uid", "%d", args.uid);
ma = mount_argf(ma, "gid", "%d", args.gid);
ma = mount_argf(ma, "mode", "%d", args.mode);
if (args.flags & HPFSMNT_TABLES) {
ma = mount_arg(ma, "d2u", args.d2u, sizeof args.d2u);
ma = mount_arg(ma, "u2d", args.u2d, sizeof args.u2d);
}
error = kernel_mount(ma, flags);
return (error);
}
static const char *hpfs_opts[] = {
"from", "export", "uid", "gid", "mode", "d2u", "u2d", NULL
};
static int
hpfs_mount (
struct mount *mp,
struct thread *td )
{
int err = 0, error;
struct vnode *devvp;
struct hpfsmount *hpmp = 0;
struct nameidata ndp;
struct export_args export;
char *from;
dprintf(("hpfs_omount():\n"));
/*
***
* Mounting non-root filesystem or updating a filesystem
***
*/
if (vfs_filteropt(mp->mnt_optnew, hpfs_opts))
return (EINVAL);
from = vfs_getopts(mp->mnt_optnew, "from", &error);
if (error)
return (error);
/*
* 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 (from == NULL) {
error = vfs_copyopt(mp->mnt_optnew, "export",
&export, sizeof export);
if (error)
return (error);
dprintf(("export 0x%x\n",args.export.ex_flags));
err = vfs_export(mp, &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 | LOCKLEAF, UIO_SYSSPACE, from, td);
err = namei(&ndp);
if (err) {
/* can't get devvp!*/
goto error_1;
}
devvp = ndp.ni_vp;
if (!vn_isdisk(devvp, &err)) {
vput(devvp);
return (err);
}
/*
********************
* 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)*/
vfs_mountedfrom(mp, from);
err = hpfs_mountfs(devvp, mp, td);
if (err) {
vrele(devvp);
goto error_1;
}
goto success;
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, td)
register struct vnode *devvp;
struct mount *mp;
struct thread *td;
{
int error, ronly, v;
struct sublock *sup;
struct spblock *spp;
struct hpfsmount *hpmp;
struct buf *bp = NULL;
struct vnode *vp;
struct cdev *dev = devvp->v_rdev;
struct g_consumer *cp;
struct bufobj *bo;
if (mp->mnt_flag & MNT_ROOTFS)
return (EOPNOTSUPP);
dprintf(("hpfs_mountfs():\n"));
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
/* XXX: use VOP_ACCESS to check FS perms */
DROP_GIANT();
g_topology_lock();
error = g_vfs_open(devvp, &cp, "hpfs", ronly ? 0 : 1);
g_topology_unlock();
PICKUP_GIANT();
VOP_UNLOCK(devvp, 0, td);
if (error)
return (error);
bo = &devvp->v_bufobj;
bo->bo_private = cp;
bo->bo_ops = g_vfs_bufops;
/*
* Do actual mount
*/
hpmp = malloc(sizeof(struct hpfsmount), M_HPFSMNT, M_WAITOK | M_ZERO);
hpmp->hpm_cp = cp;
hpmp->hpm_bo = bo;
/* 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;
if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v))
hpmp->hpm_uid = v;
if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v))
hpmp->hpm_gid = v;
if (1 == vfs_scanopt(mp->mnt_optnew, "mode", "%d", &v))
hpmp->hpm_mode = v;
error = hpfs_bminit(hpmp);
if (error)
goto failed;
error = hpfs_cpinit(mp, hpmp);
if (error) {
hpfs_bmdeinit(hpmp);
goto failed;
}
error = hpfs_root(mp, LK_EXCLUSIVE, &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;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
return (0);
failed:
if (bp)
brelse (bp);
mp->mnt_data = (qaddr_t)NULL;
g_vfs_close(cp, 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);
}
vinvalbuf(hpmp->hpm_devvp, V_SAVE, td, 0, 0);
g_vfs_close(hpmp->hpm_cp, td);
vrele(hpmp->hpm_devvp);
dprintf(("hpfs_umount: freeing memory...\n"));
hpfs_cpdeinit(hpmp);
hpfs_bmdeinit(hpmp);
mp->mnt_data = (qaddr_t)0;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp);
FREE(hpmp, M_HPFSMNT);
return (0);
}
static int
hpfs_root(
struct mount *mp,
int flags,
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;
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;
int error;
dprintf(("hpfs_vget(0x%x): ",ino));
error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
if (error || *vpp != NULL)
return (error);
*vpp = NULL;
hp = NULL;
vp = NULL;
/*
* 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_vnodeops, &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;
error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL);
if (error || *vpp != NULL)
return (error);
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_cmount = hpfs_cmount,
.vfs_mount = hpfs_mount,
.vfs_root = hpfs_root,
.vfs_statfs = hpfs_statfs,
.vfs_unmount = hpfs_unmount,
.vfs_vget = hpfs_vget,
.vfs_vptofh = hpfs_vptofh,
};
VFS_SET(hpfs_vfsops, hpfs, 0);