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NetBSD/sys/fs/puffs/puffs_vnops.c

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/* $NetBSD: puffs_vnops.c,v 1.65 2007/05/06 19:43:14 pooka Exp $ */
/*
* Copyright (c) 2005, 2006, 2007 Antti Kantee. All Rights Reserved.
*
* Development of this software was supported by the
* Google Summer of Code program and the Ulla Tuominen Foundation.
* The Google SoC project was mentored by Bill Studenmund.
*
* 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. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* 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 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>
__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.65 2007/05/06 19:43:14 pooka Exp $");
#include <sys/param.h>
#include <sys/fstrans.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <uvm/uvm.h>
#include <fs/puffs/puffs_msgif.h>
#include <fs/puffs/puffs_sys.h>
#include <miscfs/fifofs/fifo.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
int puffs_lookup(void *);
int puffs_create(void *);
int puffs_access(void *);
int puffs_mknod(void *);
int puffs_open(void *);
int puffs_close(void *);
int puffs_getattr(void *);
int puffs_setattr(void *);
int puffs_reclaim(void *);
int puffs_readdir(void *);
int puffs_poll(void *);
int puffs_fsync(void *);
int puffs_seek(void *);
int puffs_remove(void *);
int puffs_mkdir(void *);
int puffs_rmdir(void *);
int puffs_link(void *);
int puffs_readlink(void *);
int puffs_symlink(void *);
int puffs_rename(void *);
int puffs_read(void *);
int puffs_write(void *);
int puffs_fcntl(void *);
int puffs_ioctl(void *);
int puffs_inactive(void *);
int puffs_print(void *);
int puffs_pathconf(void *);
int puffs_advlock(void *);
int puffs_strategy(void *);
int puffs_bmap(void *);
int puffs_mmap(void *);
int puffs_getpages(void *);
int puffs_spec_read(void *);
int puffs_spec_write(void *);
int puffs_fifo_read(void *);
int puffs_fifo_write(void *);
int puffs_checkop(void *);
/* VOP_LEASE() not included */
int puffs_generic(void *);
#if 0
#define puffs_lock genfs_lock
#define puffs_unlock genfs_unlock
#define puffs_islocked genfs_islocked
#else
int puffs_lock(void *);
int puffs_unlock(void *);
int puffs_islocked(void *);
#endif
int (**puffs_vnodeop_p)(void *);
const struct vnodeopv_entry_desc puffs_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, puffs_lookup }, /* REAL lookup */
{ &vop_create_desc, puffs_checkop }, /* create */
{ &vop_mknod_desc, puffs_checkop }, /* mknod */
{ &vop_open_desc, puffs_open }, /* REAL open */
{ &vop_close_desc, puffs_checkop }, /* close */
{ &vop_access_desc, puffs_access }, /* REAL access */
{ &vop_getattr_desc, puffs_checkop }, /* getattr */
{ &vop_setattr_desc, puffs_checkop }, /* setattr */
{ &vop_read_desc, puffs_checkop }, /* read */
{ &vop_write_desc, puffs_checkop }, /* write */
{ &vop_fcntl_desc, puffs_checkop }, /* fcntl */
{ &vop_ioctl_desc, puffs_checkop }, /* ioctl */
{ &vop_fsync_desc, puffs_fsync }, /* REAL fsync */
{ &vop_seek_desc, puffs_checkop }, /* seek */
{ &vop_remove_desc, puffs_checkop }, /* remove */
{ &vop_link_desc, puffs_checkop }, /* link */
{ &vop_rename_desc, puffs_checkop }, /* rename */
{ &vop_mkdir_desc, puffs_checkop }, /* mkdir */
{ &vop_rmdir_desc, puffs_checkop }, /* rmdir */
{ &vop_symlink_desc, puffs_checkop }, /* symlink */
{ &vop_readdir_desc, puffs_checkop }, /* readdir */
{ &vop_readlink_desc, puffs_checkop }, /* readlink */
{ &vop_getpages_desc, puffs_checkop }, /* getpages */
{ &vop_putpages_desc, genfs_putpages }, /* REAL putpages */
{ &vop_pathconf_desc, puffs_checkop }, /* pathconf */
{ &vop_advlock_desc, puffs_checkop }, /* advlock */
{ &vop_strategy_desc, puffs_strategy }, /* REAL strategy */
{ &vop_revoke_desc, genfs_revoke }, /* REAL revoke */
{ &vop_abortop_desc, genfs_abortop }, /* REAL abortop */
{ &vop_inactive_desc, puffs_inactive }, /* REAL inactive */
{ &vop_reclaim_desc, puffs_reclaim }, /* REAL reclaim */
{ &vop_lock_desc, puffs_lock }, /* REAL lock */
{ &vop_unlock_desc, puffs_unlock }, /* REAL unlock */
{ &vop_bmap_desc, puffs_bmap }, /* REAL bmap */
{ &vop_print_desc, puffs_print }, /* REAL print */
{ &vop_islocked_desc, puffs_islocked }, /* REAL islocked */
{ &vop_bwrite_desc, genfs_nullop }, /* REAL bwrite */
{ &vop_mmap_desc, puffs_mmap }, /* REAL mmap */
{ &vop_poll_desc, genfs_eopnotsupp }, /* poll XXX */
{ &vop_poll_desc, genfs_eopnotsupp }, /* kqfilter XXX */
{ NULL, NULL }
};
const struct vnodeopv_desc puffs_vnodeop_opv_desc =
{ &puffs_vnodeop_p, puffs_vnodeop_entries };
int (**puffs_specop_p)(void *);
const struct vnodeopv_entry_desc puffs_specop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, spec_lookup }, /* lookup, ENOTDIR */
{ &vop_create_desc, spec_create }, /* genfs_badop */
{ &vop_mknod_desc, spec_mknod }, /* genfs_badop */
{ &vop_open_desc, spec_open }, /* spec_open */
{ &vop_close_desc, spec_close }, /* spec_close */
{ &vop_access_desc, puffs_checkop }, /* access */
{ &vop_getattr_desc, puffs_checkop }, /* getattr */
{ &vop_setattr_desc, puffs_checkop }, /* setattr */
{ &vop_read_desc, puffs_spec_read }, /* update, read */
{ &vop_write_desc, puffs_spec_write }, /* update, write */
{ &vop_lease_desc, spec_lease_check }, /* genfs_nullop */
{ &vop_ioctl_desc, spec_ioctl }, /* spec_ioctl */
{ &vop_fcntl_desc, genfs_fcntl }, /* dummy */
{ &vop_poll_desc, spec_poll }, /* spec_poll */
{ &vop_kqfilter_desc, spec_kqfilter }, /* spec_kqfilter */
{ &vop_revoke_desc, spec_revoke }, /* genfs_revoke */
{ &vop_mmap_desc, spec_mmap }, /* genfs_mmap (dummy) */
{ &vop_fsync_desc, spec_fsync }, /* vflushbuf */
{ &vop_seek_desc, spec_seek }, /* genfs_nullop */
{ &vop_remove_desc, spec_remove }, /* genfs_badop */
{ &vop_link_desc, spec_link }, /* genfs_badop */
{ &vop_rename_desc, spec_rename }, /* genfs_badop */
{ &vop_mkdir_desc, spec_mkdir }, /* genfs_badop */
{ &vop_rmdir_desc, spec_rmdir }, /* genfs_badop */
{ &vop_symlink_desc, spec_symlink }, /* genfs_badop */
{ &vop_readdir_desc, spec_readdir }, /* genfs_badop */
{ &vop_readlink_desc, spec_readlink }, /* genfs_badop */
{ &vop_abortop_desc, spec_abortop }, /* genfs_badop */
{ &vop_inactive_desc, puffs_inactive }, /* REAL inactive */
{ &vop_reclaim_desc, puffs_reclaim }, /* REAL reclaim */
{ &vop_lock_desc, puffs_lock }, /* REAL lock */
{ &vop_unlock_desc, puffs_unlock }, /* REAL unlock */
{ &vop_bmap_desc, spec_bmap }, /* dummy */
{ &vop_strategy_desc, spec_strategy }, /* dev strategy */
{ &vop_print_desc, puffs_print }, /* REAL print */
{ &vop_islocked_desc, puffs_islocked }, /* REAL islocked */
{ &vop_pathconf_desc, spec_pathconf }, /* pathconf */
{ &vop_advlock_desc, spec_advlock }, /* lf_advlock */
{ &vop_bwrite_desc, vn_bwrite }, /* bwrite */
{ &vop_getpages_desc, spec_getpages }, /* genfs_getpages */
{ &vop_putpages_desc, spec_putpages }, /* genfs_putpages */
#if 0
{ &vop_openextattr_desc, _openextattr }, /* openextattr */
{ &vop_closeextattr_desc, _closeextattr }, /* closeextattr */
{ &vop_getextattr_desc, _getextattr }, /* getextattr */
{ &vop_setextattr_desc, _setextattr }, /* setextattr */
{ &vop_listextattr_desc, _listextattr }, /* listextattr */
{ &vop_deleteextattr_desc, _deleteextattr }, /* deleteextattr */
#endif
{ NULL, NULL }
};
const struct vnodeopv_desc puffs_specop_opv_desc =
{ &puffs_specop_p, puffs_specop_entries };
int (**puffs_fifoop_p)(void *);
const struct vnodeopv_entry_desc puffs_fifoop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, fifo_lookup }, /* lookup, ENOTDIR */
{ &vop_create_desc, fifo_create }, /* genfs_badop */
{ &vop_mknod_desc, fifo_mknod }, /* genfs_badop */
{ &vop_open_desc, fifo_open }, /* open */
{ &vop_close_desc, fifo_close }, /* close */
{ &vop_access_desc, puffs_checkop }, /* access */
{ &vop_getattr_desc, puffs_checkop }, /* getattr */
{ &vop_setattr_desc, puffs_checkop }, /* setattr */
{ &vop_read_desc, puffs_fifo_read }, /* read, update */
{ &vop_write_desc, puffs_fifo_write }, /* write, update */
{ &vop_lease_desc, fifo_lease_check }, /* genfs_nullop */
{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
{ &vop_fcntl_desc, genfs_fcntl }, /* dummy */
{ &vop_poll_desc, fifo_poll }, /* poll */
{ &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, fifo_revoke }, /* genfs_revoke */
{ &vop_mmap_desc, fifo_mmap }, /* genfs_badop */
{ &vop_fsync_desc, fifo_fsync }, /* genfs_nullop*/
{ &vop_seek_desc, fifo_seek }, /* genfs_badop */
{ &vop_remove_desc, fifo_remove }, /* genfs_badop */
{ &vop_link_desc, fifo_link }, /* genfs_badop */
{ &vop_rename_desc, fifo_rename }, /* genfs_badop */
{ &vop_mkdir_desc, fifo_mkdir }, /* genfs_badop */
{ &vop_rmdir_desc, fifo_rmdir }, /* genfs_badop */
{ &vop_symlink_desc, fifo_symlink }, /* genfs_badop */
{ &vop_readdir_desc, fifo_readdir }, /* genfs_badop */
{ &vop_readlink_desc, fifo_readlink }, /* genfs_badop */
{ &vop_abortop_desc, fifo_abortop }, /* genfs_badop */
{ &vop_inactive_desc, puffs_inactive }, /* REAL inactive */
{ &vop_reclaim_desc, puffs_reclaim }, /* REAL reclaim */
{ &vop_lock_desc, puffs_lock }, /* REAL lock */
{ &vop_unlock_desc, puffs_unlock }, /* REAL unlock */
{ &vop_bmap_desc, fifo_bmap }, /* dummy */
{ &vop_strategy_desc, fifo_strategy }, /* genfs_badop */
{ &vop_print_desc, puffs_print }, /* REAL print */
{ &vop_islocked_desc, puffs_islocked }, /* REAL islocked */
{ &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
{ &vop_advlock_desc, fifo_advlock }, /* genfs_einval */
{ &vop_bwrite_desc, vn_bwrite }, /* bwrite */
{ &vop_putpages_desc, fifo_putpages }, /* genfs_null_putpages*/
#if 0
{ &vop_openextattr_desc, _openextattr }, /* openextattr */
{ &vop_closeextattr_desc, _closeextattr }, /* closeextattr */
{ &vop_getextattr_desc, _getextattr }, /* getextattr */
{ &vop_setextattr_desc, _setextattr }, /* setextattr */
{ &vop_listextattr_desc, _listextattr }, /* listextattr */
{ &vop_deleteextattr_desc, _deleteextattr }, /* deleteextattr */
#endif
{ NULL, NULL }
};
const struct vnodeopv_desc puffs_fifoop_opv_desc =
{ &puffs_fifoop_p, puffs_fifoop_entries };
/* "real" vnode operations */
int (**puffs_msgop_p)(void *);
const struct vnodeopv_entry_desc puffs_msgop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_create_desc, puffs_create }, /* create */
{ &vop_mknod_desc, puffs_mknod }, /* mknod */
{ &vop_open_desc, puffs_open }, /* open */
{ &vop_close_desc, puffs_close }, /* close */
{ &vop_access_desc, puffs_access }, /* access */
{ &vop_getattr_desc, puffs_getattr }, /* getattr */
{ &vop_setattr_desc, puffs_setattr }, /* setattr */
{ &vop_read_desc, puffs_read }, /* read */
{ &vop_write_desc, puffs_write }, /* write */
{ &vop_fcntl_desc, puffs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, puffs_ioctl }, /* ioctl */
{ &vop_seek_desc, puffs_seek }, /* seek */
{ &vop_remove_desc, puffs_remove }, /* remove */
{ &vop_link_desc, puffs_link }, /* link */
{ &vop_rename_desc, puffs_rename }, /* rename */
{ &vop_mkdir_desc, puffs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, puffs_rmdir }, /* rmdir */
{ &vop_symlink_desc, puffs_symlink }, /* symlink */
{ &vop_readdir_desc, puffs_readdir }, /* readdir */
{ &vop_readlink_desc, puffs_readlink }, /* readlink */
{ &vop_print_desc, puffs_print }, /* print */
{ &vop_islocked_desc, puffs_islocked }, /* islocked */
{ &vop_pathconf_desc, puffs_pathconf }, /* pathconf */
{ &vop_advlock_desc, puffs_advlock }, /* advlock */
{ &vop_getpages_desc, puffs_getpages }, /* getpages */
{ NULL, NULL }
};
const struct vnodeopv_desc puffs_msgop_opv_desc =
{ &puffs_msgop_p, puffs_msgop_entries };
#define LOCKEDVP(a) (VOP_ISLOCKED(a) ? (a) : NULL)
/*
* This is a generic vnode operation handler. It checks if the necessary
* operations for the called vnode operation are implemented by userspace
* and either returns a dummy return value or proceeds to call the real
* vnode operation from puffs_msgop_v.
*
* XXX: this should described elsewhere and autogenerated, the complexity
* of the vnode operations vectors and their interrelationships is also
* getting a bit out of hand. Another problem is that we need this same
* information in the fs server code, so keeping the two in sync manually
* is not a viable (long term) plan.
*/
/* not supported, handle locking protocol */
#define CHECKOP_NOTSUPP(op) \
case VOP_##op##_DESCOFFSET: \
if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \
return genfs_eopnotsupp(v); \
break
/* always succeed, no locking */
#define CHECKOP_SUCCESS(op) \
case VOP_##op##_DESCOFFSET: \
if (pmp->pmp_vnopmask[PUFFS_VN_##op] == 0) \
return 0; \
break
int
puffs_checkop(void *v)
{
struct vop_generic_args /* {
struct vnodeop_desc *a_desc;
spooky mystery contents;
} */ *ap = v;
struct vnodeop_desc *desc = ap->a_desc;
struct puffs_mount *pmp;
struct vnode *vp;
int offset;
DPRINTF_VERBOSE(("checkop call %s (%d)\n",
ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset));
offset = ap->a_desc->vdesc_vp_offsets[0];
#ifdef DIAGNOSTIC
if (offset == VDESC_NO_OFFSET)
panic("puffs_checkop: no vnode, why did you call me?");
#endif
vp = *VOPARG_OFFSETTO(struct vnode **, offset, ap);
pmp = MPTOPUFFSMP(vp->v_mount);
if ((pmp->pmp_flags & PUFFS_KFLAG_ALLOPS) == 0) {
switch (desc->vdesc_offset) {
CHECKOP_NOTSUPP(CREATE);
CHECKOP_NOTSUPP(MKNOD);
CHECKOP_NOTSUPP(GETATTR);
CHECKOP_NOTSUPP(SETATTR);
CHECKOP_NOTSUPP(READ);
CHECKOP_NOTSUPP(WRITE);
CHECKOP_NOTSUPP(FCNTL);
CHECKOP_NOTSUPP(IOCTL);
CHECKOP_NOTSUPP(REMOVE);
CHECKOP_NOTSUPP(LINK);
CHECKOP_NOTSUPP(RENAME);
CHECKOP_NOTSUPP(MKDIR);
CHECKOP_NOTSUPP(RMDIR);
CHECKOP_NOTSUPP(SYMLINK);
CHECKOP_NOTSUPP(READDIR);
CHECKOP_NOTSUPP(READLINK);
CHECKOP_NOTSUPP(PRINT);
CHECKOP_NOTSUPP(PATHCONF);
CHECKOP_NOTSUPP(ADVLOCK);
CHECKOP_SUCCESS(ACCESS);
CHECKOP_SUCCESS(CLOSE);
CHECKOP_SUCCESS(SEEK);
case VOP_GETPAGES_DESCOFFSET:
if (!EXISTSOP(pmp, READ))
return genfs_eopnotsupp(v);
break;
default:
panic("puffs_checkop: unhandled vnop %d",
desc->vdesc_offset);
}
}
return VOCALL(puffs_msgop_p, ap->a_desc->vdesc_offset, v);
}
int
puffs_lookup(void *v)
{
struct vop_lookup_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap = v;
struct puffs_mount *pmp;
struct componentname *cnp;
struct vnode *vp, *dvp;
struct puffs_node *dpn;
int isdot;
int error;
PUFFS_VNREQ(lookup);
pmp = MPTOPUFFSMP(ap->a_dvp->v_mount);
cnp = ap->a_cnp;
dvp = ap->a_dvp;
*ap->a_vpp = NULL;
/* first things first: check access */
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp);
if (error)
return error;
isdot = cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.';
DPRINTF(("puffs_lookup: \"%s\", parent vnode %p, op: %lx\n",
cnp->cn_nameptr, dvp, cnp->cn_nameiop));
/*
* Check if someone fed it into the cache
*/
if (PUFFS_DOCACHE(pmp)) {
error = cache_lookup(dvp, ap->a_vpp, cnp);
if (error >= 0)
return error;
}
if (isdot) {
vp = ap->a_dvp;
vref(vp);
*ap->a_vpp = vp;
return 0;
}
puffs_makecn(&lookup_arg.pvnr_cn, cnp);
if (cnp->cn_flags & ISDOTDOT)
VOP_UNLOCK(dvp, 0);
error = puffs_vntouser(pmp, PUFFS_VN_LOOKUP,
&lookup_arg, sizeof(lookup_arg), 0, VPTOPNC(dvp),
LOCKEDVP(dvp), NULL);
DPRINTF(("puffs_lookup: return of the userspace, part %d\n", error));
/*
* In case of error, there is no new vnode to play with, so be
* happy with the NULL value given to vpp in the beginning.
* Also, check if this really was an error or the target was not
* present. Either treat it as a non-error for CREATE/RENAME or
* enter the component into the negative name cache (if desired).
*/
if (error) {
if (error == ENOENT) {
if ((cnp->cn_flags & ISLASTCN)
&& (cnp->cn_nameiop == CREATE
|| cnp->cn_nameiop == RENAME)) {
cnp->cn_flags |= SAVENAME;
error = EJUSTRETURN;
} else {
if ((cnp->cn_flags & MAKEENTRY)
&& PUFFS_DOCACHE(pmp))
cache_enter(dvp, NULL, cnp);
}
} else if (error < 0) {
error = EINVAL;
}
goto errout;
}
/*
* Check that we don't get our parent node back, that would cause
* a pretty obvious deadlock.
*/
dpn = dvp->v_data;
if (lookup_arg.pvnr_newnode == dpn->pn_cookie) {
error = EINVAL;
goto errout;
}
/* XXX: race here */
/* XXX2: this check for node existence twice */
vp = puffs_pnode2vnode(pmp, lookup_arg.pvnr_newnode, 1);
if (!vp) {
error = puffs_getvnode(dvp->v_mount,
lookup_arg.pvnr_newnode, lookup_arg.pvnr_vtype,
lookup_arg.pvnr_size, lookup_arg.pvnr_rdev, &vp);
if (error) {
goto errout;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
}
*ap->a_vpp = vp;
if ((cnp->cn_flags & MAKEENTRY) != 0 && PUFFS_DOCACHE(pmp))
cache_enter(dvp, vp, cnp);
errout:
if (cnp->cn_flags & ISDOTDOT)
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
DPRINTF(("puffs_lookup: returning %d %p\n", error, *ap->a_vpp));
return error;
}
int
puffs_create(void *v)
{
struct vop_create_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
int error;
PUFFS_VNREQ(create);
DPRINTF(("puffs_create: dvp %p, cnp: %s\n",
ap->a_dvp, ap->a_cnp->cn_nameptr));
puffs_makecn(&create_arg.pvnr_cn, ap->a_cnp);
create_arg.pvnr_va = *ap->a_vap;
error = puffs_vntouser(MPTOPUFFSMP(ap->a_dvp->v_mount), PUFFS_VN_CREATE,
&create_arg, sizeof(create_arg), 0, VPTOPNC(ap->a_dvp),
ap->a_dvp, NULL);
if (error)
goto out;
error = puffs_newnode(ap->a_dvp->v_mount, ap->a_dvp, ap->a_vpp,
create_arg.pvnr_newnode, ap->a_cnp, ap->a_vap->va_type, 0);
/* XXX: in case of error, need to uncommit userspace transaction */
out:
if (error || (ap->a_cnp->cn_flags & SAVESTART) == 0)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
vput(ap->a_dvp);
DPRINTF(("puffs_create: return %d\n", error));
return error;
}
int
puffs_mknod(void *v)
{
struct vop_mknod_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
int error;
PUFFS_VNREQ(mknod);
puffs_makecn(&mknod_arg.pvnr_cn, ap->a_cnp);
mknod_arg.pvnr_va = *ap->a_vap;
error = puffs_vntouser(MPTOPUFFSMP(ap->a_dvp->v_mount), PUFFS_VN_MKNOD,
&mknod_arg, sizeof(mknod_arg), 0, VPTOPNC(ap->a_dvp),
ap->a_dvp, NULL);
if (error)
goto out;
error = puffs_newnode(ap->a_dvp->v_mount, ap->a_dvp, ap->a_vpp,
mknod_arg.pvnr_newnode, ap->a_cnp, ap->a_vap->va_type,
ap->a_vap->va_rdev);
out:
if (error || (ap->a_cnp->cn_flags & SAVESTART) == 0)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
vput(ap->a_dvp);
return error;
}
int
puffs_open(void *v)
{
struct vop_open_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int mode = ap->a_mode;
int rv;
PUFFS_VNREQ(open);
DPRINTF(("puffs_open: vp %p, mode 0x%x\n", vp, mode));
if (vp->v_type == VREG && mode & FWRITE && !EXISTSOP(pmp, WRITE)) {
rv = EROFS;
goto out;
}
if (!EXISTSOP(pmp, OPEN)) {
rv = 0;
goto out;
}
open_arg.pvnr_mode = mode;
puffs_credcvt(&open_arg.pvnr_cred, ap->a_cred);
open_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
rv = puffs_vntouser(MPTOPUFFSMP(vp->v_mount), PUFFS_VN_OPEN,
&open_arg, sizeof(open_arg), 0, VPTOPNC(vp), vp, NULL);
out:
DPRINTF(("puffs_open: returning %d\n", rv));
return rv;
}
int
puffs_close(void *v)
{
struct vop_close_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct puffs_vnreq_close *close_argp;
close_argp = malloc(sizeof(struct puffs_vnreq_close),
M_PUFFS, M_WAITOK | M_ZERO);
close_argp->pvnr_fflag = ap->a_fflag;
puffs_credcvt(&close_argp->pvnr_cred, ap->a_cred);
close_argp->pvnr_pid = puffs_lwp2pid(ap->a_l);
puffs_vntouser_faf(MPTOPUFFSMP(ap->a_vp->v_mount), PUFFS_VN_CLOSE,
close_argp, sizeof(struct puffs_vnreq_close), VPTOPNC(ap->a_vp));
return 0;
}
int
puffs_access(void *v)
{
struct vop_access_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int mode = ap->a_mode;
PUFFS_VNREQ(access);
if (vp->v_type == VREG && mode & VWRITE && !EXISTSOP(pmp, WRITE))
return EROFS;
if (!EXISTSOP(pmp, ACCESS))
return 0;
access_arg.pvnr_mode = ap->a_mode;
access_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
puffs_credcvt(&access_arg.pvnr_cred, ap->a_cred);
return puffs_vntouser(MPTOPUFFSMP(vp->v_mount), PUFFS_VN_ACCESS,
&access_arg, sizeof(access_arg), 0, VPTOPNC(vp), vp, NULL);
}
int
puffs_getattr(void *v)
{
struct vop_getattr_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct mount *mp;
struct vnode *vp;
struct vattr *vap;
struct puffs_node *pn;
int error;
PUFFS_VNREQ(getattr);
vp = ap->a_vp;
mp = vp->v_mount;
vap = ap->a_vap;
vattr_null(&getattr_arg.pvnr_va);
puffs_credcvt(&getattr_arg.pvnr_cred, ap->a_cred);
getattr_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
/*
* XXX + XX (dos equis): this can't go through the unlock/lock
* cycle, since it can be called from uvn_attach(), which fiddles
* around with VXLOCK and therefore breaks vn_lock(). Proper
* fix pending.
*/
error = puffs_vntouser(MPTOPUFFSMP(vp->v_mount), PUFFS_VN_GETATTR,
&getattr_arg, sizeof(getattr_arg), 0, VPTOPNC(vp),
NULL /* XXXseeabove: should be LOCKEDVP(vp) */, NULL);
if (error)
return error;
(void) memcpy(vap, &getattr_arg.pvnr_va, sizeof(struct vattr));
vap->va_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
pn = VPTOPP(vp);
if (pn->pn_stat & PNODE_METACACHE_ATIME)
vap->va_atime = pn->pn_mc_atime;
if (pn->pn_stat & PNODE_METACACHE_CTIME)
vap->va_ctime = pn->pn_mc_ctime;
if (pn->pn_stat & PNODE_METACACHE_MTIME)
vap->va_mtime = pn->pn_mc_mtime;
if (pn->pn_stat & PNODE_METACACHE_SIZE) {
vap->va_size = pn->pn_mc_size;
} else {
if (getattr_arg.pvnr_va.va_size != VNOVAL)
uvm_vnp_setsize(vp, getattr_arg.pvnr_va.va_size);
}
return 0;
}
int
puffs_setattr(void *v)
{
struct vop_getattr_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
int error;
struct vattr *vap = ap->a_vap;
struct puffs_node *pn = ap->a_vp->v_data;
PUFFS_VNREQ(setattr);
/*
* Flush metacache first. If we are called with some explicit
* parameters, treat them as information overriding metacache
* information.
*/
if (pn->pn_stat & PNODE_METACACHE_MASK) {
if ((pn->pn_stat & PNODE_METACACHE_ATIME)
&& vap->va_atime.tv_sec == VNOVAL)
vap->va_atime = pn->pn_mc_atime;
if ((pn->pn_stat & PNODE_METACACHE_CTIME)
&& vap->va_ctime.tv_sec == VNOVAL)
vap->va_ctime = pn->pn_mc_ctime;
if ((pn->pn_stat & PNODE_METACACHE_MTIME)
&& vap->va_mtime.tv_sec == VNOVAL)
vap->va_mtime = pn->pn_mc_mtime;
if ((pn->pn_stat & PNODE_METACACHE_SIZE)
&& vap->va_size == VNOVAL)
vap->va_size = pn->pn_mc_size;
pn->pn_stat &= ~PNODE_METACACHE_MASK;
}
(void)memcpy(&setattr_arg.pvnr_va, vap, sizeof(struct vattr));
puffs_credcvt(&setattr_arg.pvnr_cred, ap->a_cred);
setattr_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
error = puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount), PUFFS_VN_SETATTR,
&setattr_arg, sizeof(setattr_arg), 0, VPTOPNC(ap->a_vp),
ap->a_vp, NULL);
if (error)
return error;
if (vap->va_size != VNOVAL)
uvm_vnp_setsize(ap->a_vp, vap->va_size);
return 0;
}
int
puffs_inactive(void *v)
{
struct vop_inactive_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct lwp *a_l;
} */ *ap = v;
struct puffs_mount *pmp;
struct puffs_node *pnode;
int rv, vnrefs;
PUFFS_VNREQ(inactive);
/*
* XXX: think about this after we really start unlocking
* when going to userspace
*/
pnode = ap->a_vp->v_data;
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
inactive_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
if (EXISTSOP(pmp, INACTIVE))
rv = puffs_vntouser(pmp, PUFFS_VN_INACTIVE,
&inactive_arg, sizeof(inactive_arg), 0, VPTOPNC(ap->a_vp),
ap->a_vp, NULL);
else
rv = 1; /* see below */
/* can't trust userspace return value? simulate safe answer */
if (rv)
vnrefs = 1;
else
vnrefs = inactive_arg.pvnr_backendrefs;
VOP_UNLOCK(ap->a_vp, 0);
/*
* user server thinks it's gone? then don't be afraid care,
* node's life was already all it would ever be
*/
if (vnrefs == 0) {
pnode->pn_stat |= PNODE_NOREFS;
vrecycle(ap->a_vp, NULL, ap->a_l);
}
return 0;
}
/*
* always FAF, we don't really care if the server wants to fail to
* reclaim the node or not
*/
int
puffs_reclaim(void *v)
{
struct vop_reclaim_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct lwp *a_l;
} */ *ap = v;
struct puffs_mount *pmp;
struct puffs_vnreq_reclaim *reclaim_argp;
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
/*
* first things first: check if someone is trying to reclaim the
* root vnode. do not allow that to travel to userspace.
* Note that we don't need to take the lock similarly to
* puffs_root(), since there is only one of us.
*/
if (ap->a_vp->v_flag & VROOT) {
mutex_enter(&pmp->pmp_lock);
KASSERT(pmp->pmp_root != NULL);
pmp->pmp_root = NULL;
mutex_exit(&pmp->pmp_lock);
goto out;
}
if (!EXISTSOP(pmp, RECLAIM))
goto out;
reclaim_argp = malloc(sizeof(struct puffs_vnreq_reclaim),
M_PUFFS, M_WAITOK | M_ZERO);
reclaim_argp->pvnr_pid = puffs_lwp2pid(ap->a_l);
puffs_vntouser_faf(pmp, PUFFS_VN_RECLAIM,
reclaim_argp, sizeof(struct puffs_vnreq_reclaim),
VPTOPNC(ap->a_vp));
out:
if (PUFFS_DOCACHE(pmp))
cache_purge(ap->a_vp);
puffs_putvnode(ap->a_vp);
return 0;
}
#define CSIZE sizeof(**ap->a_cookies)
int
puffs_readdir(void *v)
{
struct vop_readdir_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
int *a_eofflag;
off_t **a_cookies;
int *a_ncookies;
} */ *ap = v;
struct puffs_mount *pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
struct puffs_vnreq_readdir *readdir_argp;
size_t argsize, tomove, cookiemem, cookiesmax;
struct uio *uio = ap->a_uio;
size_t howmuch;
int error;
if (ap->a_cookies) {
KASSERT(ap->a_ncookies != NULL);
if (pmp->pmp_args.pa_fhsize == 0)
return EOPNOTSUPP;
cookiesmax = uio->uio_resid/_DIRENT_MINSIZE((struct dirent *)0);
cookiemem = ALIGN(cookiesmax*CSIZE); /* play safe */
} else {
cookiesmax = 0;
cookiemem = 0;
}
argsize = sizeof(struct puffs_vnreq_readdir);
tomove = uio->uio_resid + cookiemem;
readdir_argp = malloc(argsize + tomove, M_PUFFS, M_ZERO | M_WAITOK);
puffs_credcvt(&readdir_argp->pvnr_cred, ap->a_cred);
readdir_argp->pvnr_offset = uio->uio_offset;
readdir_argp->pvnr_resid = uio->uio_resid;
readdir_argp->pvnr_ncookies = cookiesmax;
readdir_argp->pvnr_eofflag = 0;
readdir_argp->pvnr_dentoff = cookiemem;
error = puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount),
PUFFS_VN_READDIR, readdir_argp, argsize, tomove,
VPTOPNC(ap->a_vp), ap->a_vp, NULL);
if (error)
goto out;
/* userspace is cheating? */
if (readdir_argp->pvnr_resid > uio->uio_resid
|| readdir_argp->pvnr_ncookies > cookiesmax) {
error = EINVAL;
goto out;
}
/* check eof */
if (readdir_argp->pvnr_eofflag)
*ap->a_eofflag = 1;
/* bouncy-wouncy with the directory data */
howmuch = uio->uio_resid - readdir_argp->pvnr_resid;
/* force eof if no data was returned (getcwd() needs this) */
if (howmuch == 0) {
*ap->a_eofflag = 1;
goto out;
}
error = uiomove(readdir_argp->pvnr_data + cookiemem, howmuch, uio);
if (error)
goto out;
/* provide cookies to caller if so desired */
if (ap->a_cookies) {
*ap->a_cookies = malloc(readdir_argp->pvnr_ncookies*CSIZE,
M_TEMP, M_WAITOK);
*ap->a_ncookies = readdir_argp->pvnr_ncookies;
memcpy(*ap->a_cookies, readdir_argp->pvnr_data,
*ap->a_ncookies*CSIZE);
}
/* next readdir starts here */
uio->uio_offset = readdir_argp->pvnr_offset;
out:
free(readdir_argp, M_PUFFS);
return error;
}
#undef CSIZE
int
puffs_poll(void *v)
{
struct vop_poll_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_events;
struct lwp *a_l;
}<7D>*/ *ap = v;
PUFFS_VNREQ(poll);
poll_arg.pvnr_events = ap->a_events;
poll_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
return puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount), PUFFS_VN_POLL,
&poll_arg, sizeof(poll_arg), 0, VPTOPNC(ap->a_vp), NULL, NULL);
}
int
puffs_fsync(void *v)
{
struct vop_fsync_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
kauth_cred_t a_cred;
int a_flags;
off_t a_offlo;
off_t a_offhi;
struct lwp *a_l;
} */ *ap = v;
struct vattr va;
struct puffs_mount *pmp;
struct puffs_vnreq_fsync *fsync_argp;
struct vnode *vp;
struct puffs_node *pn;
int pflags, error, dofaf;
PUFFS_VNREQ(fsync);
vp = ap->a_vp;
pn = VPTOPP(vp);
pmp = MPTOPUFFSMP(vp->v_mount);
/* flush out information from our metacache, see vop_setattr */
if (pn->pn_stat & PNODE_METACACHE_MASK) {
vattr_null(&va);
error = VOP_SETATTR(vp, &va, FSCRED, NULL);
if (error)
return error;
}
/*
* flush pages to avoid being overly dirty
*/
pflags = PGO_CLEANIT;
if (ap->a_flags & FSYNC_WAIT)
pflags |= PGO_SYNCIO;
simple_lock(&vp->v_interlock);
error = VOP_PUTPAGES(vp, trunc_page(ap->a_offlo),
round_page(ap->a_offhi), pflags);
if (error)
return error;
/*
* HELLO! We exit already here if the user server does not
* support fsync OR if we should call fsync for a node which
* has references neither in the kernel or the fs server.
* Otherwise we continue to issue fsync() forward.
*/
if (!EXISTSOP(pmp, FSYNC) || (pn->pn_stat & PNODE_NOREFS))
return 0;
dofaf = (ap->a_flags & FSYNC_WAIT) == 0 || ap->a_flags == FSYNC_LAZY;
/*
* We abuse VXLOCK to mean "vnode is going to die", so we issue
* only FAFs for those. Otherwise there's a danger of deadlock,
* since the execution context here might be the user server
* doing some operation on another fs, which in turn caused a
* vnode to be reclaimed from the freelist for this fs.
*/
if (dofaf == 0) {
simple_lock(&vp->v_interlock);
if (vp->v_flag & VXLOCK)
dofaf = 1;
simple_unlock(&vp->v_interlock);
}
if (dofaf == 0) {
fsync_argp = &fsync_arg;
} else {
fsync_argp = malloc(sizeof(struct puffs_vnreq_fsync),
M_PUFFS, M_ZERO | M_NOWAIT);
if (fsync_argp == NULL)
return ENOMEM;
}
puffs_credcvt(&fsync_argp->pvnr_cred, ap->a_cred);
fsync_argp->pvnr_flags = ap->a_flags;
fsync_argp->pvnr_offlo = ap->a_offlo;
fsync_argp->pvnr_offhi = ap->a_offhi;
fsync_argp->pvnr_pid = puffs_lwp2pid(ap->a_l);
/*
* XXX: see comment at puffs_getattr about locking
*
* If we are not required to wait, do a FAF operation.
* Otherwise block here.
*/
if (dofaf == 0) {
error = puffs_vntouser(MPTOPUFFSMP(vp->v_mount),
PUFFS_VN_FSYNC, fsync_argp, sizeof(*fsync_argp), 0,
VPTOPNC(vp), NULL /* XXXshouldbe: vp */, NULL);
} else {
/* FAF is always "succesful" */
error = 0;
puffs_vntouser_faf(MPTOPUFFSMP(vp->v_mount),
PUFFS_VN_FSYNC, fsync_argp, sizeof(*fsync_argp),
VPTOPNC(vp));
}
return error;
}
int
puffs_seek(void *v)
{
struct vop_seek_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
off_t a_oldoff;
off_t a_newoff;
kauth_cred_t a_cred;
} */ *ap = v;
PUFFS_VNREQ(seek);
seek_arg.pvnr_oldoff = ap->a_oldoff;
seek_arg.pvnr_newoff = ap->a_newoff;
puffs_credcvt(&seek_arg.pvnr_cred, ap->a_cred);
/*
* XXX: seems like seek is called with an unlocked vp, but
* it can't hurt to play safe
*/
return puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount), PUFFS_VN_SEEK,
&seek_arg, sizeof(seek_arg), 0, VPTOPNC(ap->a_vp),
LOCKEDVP(ap->a_vp), NULL);
}
int
puffs_remove(void *v)
{
struct vop_remove_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
int error;
PUFFS_VNREQ(remove);
remove_arg.pvnr_cookie_targ = VPTOPNC(ap->a_vp);
puffs_makecn(&remove_arg.pvnr_cn, ap->a_cnp);
error = puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount), PUFFS_VN_REMOVE,
&remove_arg, sizeof(remove_arg), 0, VPTOPNC(ap->a_dvp),
ap->a_dvp, ap->a_vp);
vput(ap->a_vp);
if (ap->a_dvp == ap->a_vp)
vrele(ap->a_dvp);
else
vput(ap->a_dvp);
return error;
}
int
puffs_mkdir(void *v)
{
struct vop_mkdir_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
int error;
PUFFS_VNREQ(mkdir);
puffs_makecn(&mkdir_arg.pvnr_cn, ap->a_cnp);
mkdir_arg.pvnr_va = *ap->a_vap;
/* XXX: wouldn't need to relock dvp, but that's life */
error = puffs_vntouser(MPTOPUFFSMP(ap->a_dvp->v_mount), PUFFS_VN_MKDIR,
&mkdir_arg, sizeof(mkdir_arg), 0, VPTOPNC(ap->a_dvp),
ap->a_dvp, NULL);
if (error)
goto out;
error = puffs_newnode(ap->a_dvp->v_mount, ap->a_dvp, ap->a_vpp,
mkdir_arg.pvnr_newnode, ap->a_cnp, VDIR, 0);
out:
if (error || (ap->a_cnp->cn_flags & SAVESTART) == 0)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
vput(ap->a_dvp);
return error;
}
int
puffs_rmdir(void *v)
{
struct vop_rmdir_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
int error;
PUFFS_VNREQ(rmdir);
rmdir_arg.pvnr_cookie_targ = VPTOPNC(ap->a_vp);
puffs_makecn(&rmdir_arg.pvnr_cn, ap->a_cnp);
error = puffs_vntouser(MPTOPUFFSMP(ap->a_dvp->v_mount), PUFFS_VN_RMDIR,
&rmdir_arg, sizeof(rmdir_arg), 0, VPTOPNC(ap->a_dvp),
ap->a_dvp, ap->a_vp);
/* XXX: some call cache_purge() *for both vnodes* here, investigate */
vput(ap->a_dvp);
vput(ap->a_vp);
return error;
}
int
puffs_link(void *v)
{
struct vop_link_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
}<7D>*/ *ap = v;
int error;
PUFFS_VNREQ(link);
link_arg.pvnr_cookie_targ = VPTOPNC(ap->a_vp);
puffs_makecn(&link_arg.pvnr_cn, ap->a_cnp);
error = puffs_vntouser(MPTOPUFFSMP(ap->a_dvp->v_mount), PUFFS_VN_LINK,
&link_arg, sizeof(link_arg), 0, VPTOPNC(ap->a_dvp),
ap->a_dvp, NULL);
/*
* XXX: stay in touch with the cache. I don't like this, but
* don't have a better solution either. See also puffs_rename().
*/
if (error == 0)
puffs_updatenode(ap->a_vp, PUFFS_UPDATECTIME);
vput(ap->a_dvp);
return error;
}
int
puffs_symlink(void *v)
{
struct vop_symlink_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
}<7D>*/ *ap = v;
int error;
PUFFS_VNREQ(symlink); /* XXX: large structure */
*ap->a_vpp = NULL;
puffs_makecn(&symlink_arg.pvnr_cn, ap->a_cnp);
symlink_arg.pvnr_va = *ap->a_vap;
(void)strlcpy(symlink_arg.pvnr_link, ap->a_target,
sizeof(symlink_arg.pvnr_link));
/* XXX: don't need to relock parent */
error = puffs_vntouser(MPTOPUFFSMP(ap->a_dvp->v_mount),
PUFFS_VN_SYMLINK, &symlink_arg, sizeof(symlink_arg), 0,
VPTOPNC(ap->a_dvp), ap->a_dvp, NULL);
if (error)
goto out;
error = puffs_newnode(ap->a_dvp->v_mount, ap->a_dvp, ap->a_vpp,
symlink_arg.pvnr_newnode, ap->a_cnp, VLNK, 0);
out:
if (error || (ap->a_cnp->cn_flags & SAVESTART) == 0)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
vput(ap->a_dvp);
return error;
}
int
puffs_readlink(void *v)
{
struct vop_readlink_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
} */ *ap = v;
size_t linklen;
int error;
PUFFS_VNREQ(readlink);
puffs_credcvt(&readlink_arg.pvnr_cred, ap->a_cred);
linklen = sizeof(readlink_arg.pvnr_link);
readlink_arg.pvnr_linklen = linklen;
error = puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount),
PUFFS_VN_READLINK, &readlink_arg, sizeof(readlink_arg), 0,
VPTOPNC(ap->a_vp), ap->a_vp, NULL);
if (error)
return error;
/* bad bad user file server */
if (readlink_arg.pvnr_linklen > linklen)
return EINVAL;
return uiomove(&readlink_arg.pvnr_link, readlink_arg.pvnr_linklen,
ap->a_uio);
}
/* XXXXXXX: think about locking & userspace op delocking... */
int
puffs_rename(void *v)
{
struct vop_rename_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
}<7D>*/ *ap = v;
int error;
PUFFS_VNREQ(rename);
if (ap->a_fvp->v_mount != ap->a_tdvp->v_mount) {
error = EXDEV;
goto out;
}
rename_arg.pvnr_cookie_src = VPTOPNC(ap->a_fvp);
rename_arg.pvnr_cookie_targdir = VPTOPNC(ap->a_tdvp);
if (ap->a_tvp)
rename_arg.pvnr_cookie_targ = VPTOPNC(ap->a_tvp);
else
rename_arg.pvnr_cookie_targ = NULL;
puffs_makecn(&rename_arg.pvnr_cn_src, ap->a_fcnp);
puffs_makecn(&rename_arg.pvnr_cn_targ, ap->a_tcnp);
error = puffs_vntouser(MPTOPUFFSMP(ap->a_fdvp->v_mount),
PUFFS_VN_RENAME, &rename_arg, sizeof(rename_arg), 0,
VPTOPNC(ap->a_fdvp), NULL, NULL);
/*
* XXX: stay in touch with the cache. I don't like this, but
* don't have a better solution either. See also puffs_link().
*/
if (error == 0)
puffs_updatenode(ap->a_fvp, PUFFS_UPDATECTIME);
out:
if (ap->a_tvp != NULL)
vput(ap->a_tvp);
if (ap->a_tdvp == ap->a_tvp)
vrele(ap->a_tdvp);
else
vput(ap->a_tdvp);
vrele(ap->a_fdvp);
vrele(ap->a_fvp);
return error;
}
int
puffs_read(void *v)
{
struct vop_read_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct puffs_vnreq_read *read_argp;
struct puffs_mount *pmp;
struct vnode *vp;
struct uio *uio;
void *win;
size_t tomove, argsize;
vsize_t bytelen;
int error, ubcflags;
uio = ap->a_uio;
vp = ap->a_vp;
read_argp = NULL;
error = 0;
pmp = MPTOPUFFSMP(vp->v_mount);
/* std sanity */
if (uio->uio_resid == 0)
return 0;
if (uio->uio_offset < 0)
return EINVAL;
if (vp->v_type == VREG && PUFFS_DOCACHE(pmp)) {
const int advice = IO_ADV_DECODE(ap->a_ioflag);
ubcflags = 0;
if (UBC_WANT_UNMAP(vp))
ubcflags = UBC_UNMAP;
while (uio->uio_resid > 0) {
bytelen = MIN(uio->uio_resid,
vp->v_size - uio->uio_offset);
if (bytelen == 0)
break;
win = ubc_alloc(&vp->v_uobj, uio->uio_offset,
&bytelen, advice, UBC_READ);
error = uiomove(win, bytelen, uio);
ubc_release(win, ubcflags);
if (error)
break;
}
if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
puffs_updatenode(vp, PUFFS_UPDATEATIME);
} else {
/*
* in case it's not a regular file or we're operating
* uncached, do read in the old-fashioned style,
* i.e. explicit read operations
*/
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
argsize = sizeof(struct puffs_vnreq_read);
read_argp = malloc(argsize + tomove,
M_PUFFS, M_WAITOK | M_ZERO);
error = 0;
while (uio->uio_resid > 0) {
read_argp->pvnr_ioflag = ap->a_ioflag;
read_argp->pvnr_resid = tomove;
read_argp->pvnr_offset = uio->uio_offset;
puffs_credcvt(&read_argp->pvnr_cred, ap->a_cred);
argsize = sizeof(struct puffs_vnreq_read);
error = puffs_vntouser(pmp, PUFFS_VN_READ,
read_argp, argsize, tomove,
VPTOPNC(ap->a_vp), ap->a_vp, NULL);
if (error)
break;
if (read_argp->pvnr_resid > tomove) {
error = EINVAL;
break;
}
error = uiomove(read_argp->pvnr_data,
tomove - read_argp->pvnr_resid, uio);
/*
* in case the file is out of juice, resid from
* userspace is != 0. and the error-case is
* quite obvious
*/
if (error || read_argp->pvnr_resid)
break;
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
}
}
if (read_argp)
free(read_argp, M_PUFFS);
return error;
}
int
puffs_write(void *v)
{
struct vop_write_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
}<7D>*/ *ap = v;
struct puffs_vnreq_write *write_argp;
struct puffs_mount *pmp;
struct uio *uio;
struct vnode *vp;
void *win;
size_t tomove, argsize;
off_t oldoff, newoff, origoff;
vsize_t bytelen;
int error, uflags;
int ubcflags;
vp = ap->a_vp;
uio = ap->a_uio;
error = uflags = 0;
write_argp = NULL;
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
if (vp->v_type == VREG && PUFFS_DOCACHE(pmp)) {
ubcflags = 0;
if (UBC_WANT_UNMAP(vp))
ubcflags = UBC_UNMAP;
/*
* userspace *should* be allowed to control this,
* but with UBC it's a bit unclear how to handle it
*/
if (ap->a_ioflag & IO_APPEND)
uio->uio_offset = vp->v_size;
origoff = uio->uio_offset;
while (uio->uio_resid > 0) {
uflags |= PUFFS_UPDATECTIME;
uflags |= PUFFS_UPDATEMTIME;
oldoff = uio->uio_offset;
bytelen = uio->uio_resid;
win = ubc_alloc(&vp->v_uobj, oldoff, &bytelen,
UVM_ADV_NORMAL, UBC_WRITE);
error = uiomove(win, bytelen, uio);
/*
* There is no guarantee that the faults
* generated by uiomove() succeed at all.
* Therefore, in case of an uiomove() error,
* opt to not extend the file at all and
* return an error. Otherwise, if we attempt
* to clear the memory we couldn't fault to,
* we might generate a kernel page fault.
*/
newoff = oldoff + bytelen;
if (vp->v_size < newoff && error == 0) {
uflags |= PUFFS_UPDATESIZE;
uvm_vnp_setsize(vp, newoff);
}
ubc_release(win, ubcflags);
if (error)
break;
/*
* If we're writing large files, flush to file server
* every 64k. Otherwise we can very easily exhaust
* kernel and user memory, as the file server cannot
* really keep up with our writing speed.
*
* Note: this does *NOT* honor MNT_ASYNC, because
* that gives userland too much say in the kernel.
*/
if (oldoff >> 16 != uio->uio_offset >> 16) {
simple_lock(&vp->v_interlock);
error = VOP_PUTPAGES(vp, oldoff & ~0xffff,
uio->uio_offset & ~0xffff,
PGO_CLEANIT | PGO_SYNCIO);
if (error)
break;
}
}
/* synchronous I/O? */
if (error == 0 && ap->a_ioflag & IO_SYNC) {
simple_lock(&vp->v_interlock);
error = VOP_PUTPAGES(vp, trunc_page(origoff),
round_page(uio->uio_offset),
PGO_CLEANIT | PGO_SYNCIO);
/* write though page cache? */
} else if (error == 0 && pmp->pmp_flags & PUFFS_KFLAG_WTCACHE) {
simple_lock(&vp->v_interlock);
error = VOP_PUTPAGES(vp, trunc_page(origoff),
round_page(uio->uio_offset), PGO_CLEANIT);
}
puffs_updatenode(vp, uflags);
} else {
/* tomove is non-increasing */
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
argsize = sizeof(struct puffs_vnreq_write) + tomove;
write_argp = malloc(argsize, M_PUFFS, M_WAITOK | M_ZERO);
while (uio->uio_resid > 0) {
write_argp->pvnr_ioflag = ap->a_ioflag;
write_argp->pvnr_resid = tomove;
write_argp->pvnr_offset = uio->uio_offset;
puffs_credcvt(&write_argp->pvnr_cred, ap->a_cred);
error = uiomove(write_argp->pvnr_data, tomove, uio);
if (error)
break;
error = puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount),
PUFFS_VN_WRITE, write_argp, argsize, 0,
VPTOPNC(ap->a_vp), ap->a_vp, NULL);
if (error) {
/* restore uiomove */
uio->uio_resid += tomove;
uio->uio_offset -= tomove;
break;
}
if (write_argp->pvnr_resid > tomove) {
/*
* XXX: correct file size is a mystery,
* we can only guess
*/
error = EINVAL;
break;
}
/* adjust file size */
if (vp->v_size < uio->uio_offset)
uvm_vnp_setsize(vp, uio->uio_offset);
/* didn't move everything? bad userspace. bail */
if (write_argp->pvnr_resid != 0) {
uio->uio_resid += write_argp->pvnr_resid;
uio->uio_offset -= write_argp->pvnr_resid;
error = EIO;
break;
}
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
}
}
if (write_argp)
free(write_argp, M_PUFFS);
return error;
}
static int puffs_fcnioctl(struct vop_ioctl_args * /*XXX*/, int);
#define FCNIOCTL_ARG_MAX 1<<16
int
puffs_fcnioctl(struct vop_ioctl_args *ap, int puffsop)
{
/* currently not supported */
return EOPNOTSUPP;
#if 0
/* struct vop_ioctl_args {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
u_long a_command;
void *a_data;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
}<7D>*ap = v; */
struct puffs_mount *pmp;
struct puffs_sizepark pspark;
void *kernbuf;
size_t copylen;
int error;
PUFFS_VNREQ(fcnioctl);
/*
* Since this op gives the filesystem (almost) complete control on
* how much it is allowed to copy from the calling process
* address space, do not enable it by default, since it would
* be a whopping security hole.
*/
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
if ((pmp->pmp_flags & PUFFS_KFLAG_ALLOWCTL) == 0)
return EINVAL; /* only shoe that fits */
/* fill in sizereq and store it */
pspark.pkso_reqid = puffs_getreqid(pmp);
pspark.pkso_reqtype = PUFFS_SIZEOPREQ_BUF_IN;
pspark.pkso_copybuf = ap->a_data;
pspark.pkso_bufsize = FCNIOCTL_ARG_MAX;
TAILQ_INSERT_TAIL(&pmp->pmp_req_sizepark, &pspark, pkso_entries);
/* then fill in actual request and shoot it off */
fcnioctl_arg.pvnr_command = ap->a_command;
fcnioctl_arg.pvnr_fflag = ap->a_fflag;
puffs_credcvt(&fcnioctl_arg.pvnr_cred, ap->a_cred);
fcnioctl_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
error = puffs_vntouser_req(MPTOPUFFSMP(ap->a_vp->v_mount), puffsop,
&fcnioctl_arg, sizeof(fcnioctl_arg), 0, VPTOPNC(ap->a_vp),
pspark.pkso_reqid, NULL, NULL);
/* if we don't need to copy data, we're done */
if (error || !fcnioctl_arg.pvnr_copyback)
return error;
copylen = MIN(FCNIOCTL_ARG_MAX, fcnioctl_arg.pvnr_datalen);
kernbuf = malloc(copylen, M_PUFFS, M_WAITOK);
error = copyin(fcnioctl_arg.pvnr_data, kernbuf, copylen);
if (error)
goto out;
error = copyout(kernbuf, ap->a_data, copylen);
out:
free(kernbuf, M_PUFFS);
return error;
#endif
}
int
puffs_ioctl(void *v)
{
return puffs_fcnioctl(v, PUFFS_VN_IOCTL);
}
int
puffs_fcntl(void *v)
{
return puffs_fcnioctl(v, PUFFS_VN_FCNTL);
}
int
puffs_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct puffs_mount *pmp;
struct vnode *vp = ap->a_vp;
struct puffs_node *pn = vp->v_data;
PUFFS_VNREQ(print);
pmp = MPTOPUFFSMP(vp->v_mount);
/* kernel portion */
printf("tag VT_PUFFS, vnode %p, puffs node: %p,\n"
" userspace cookie: %p\n", vp, pn, pn->pn_cookie);
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
lockmgr_printinfo(&vp->v_lock);
/* userspace portion */
if (EXISTSOP(pmp, PRINT))
puffs_vntouser(pmp, PUFFS_VN_PRINT,
&print_arg, sizeof(print_arg), 0, VPTOPNC(ap->a_vp),
LOCKEDVP(ap->a_vp), NULL);
return 0;
}
int
puffs_pathconf(void *v)
{
struct vop_pathconf_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap = v;
int error;
PUFFS_VNREQ(pathconf);
pathconf_arg.pvnr_name = ap->a_name;
error = puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount),
PUFFS_VN_PATHCONF, &pathconf_arg, sizeof(pathconf_arg), 0,
VPTOPNC(ap->a_vp), ap->a_vp, NULL);
if (error)
return error;
*ap->a_retval = pathconf_arg.pvnr_retval;
return 0;
}
int
puffs_advlock(void *v)
{
struct vop_advlock_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
void *a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap = v;
int error;
PUFFS_VNREQ(advlock);
error = copyin(ap->a_fl, &advlock_arg.pvnr_fl, sizeof(struct flock));
if (error)
return error;
advlock_arg.pvnr_id = ap->a_id;
advlock_arg.pvnr_op = ap->a_op;
advlock_arg.pvnr_flags = ap->a_flags;
return puffs_vntouser(MPTOPUFFSMP(ap->a_vp->v_mount), PUFFS_VN_ADVLOCK,
&advlock_arg, sizeof(advlock_arg), 0, VPTOPNC(ap->a_vp),
NULL, NULL);
}
/*
* This maps itself to PUFFS_VN_READ/WRITE for data transfer.
*/
int
puffs_strategy(void *v)
{
struct vop_strategy_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct buf *a_bp;
} */ *ap = v;
struct puffs_mount *pmp;
struct vnode *vp = ap->a_vp;
struct puffs_node *pn;
struct puffs_vnreq_read *read_argp = NULL;
struct puffs_vnreq_write *write_argp = NULL;
struct buf *bp;
size_t argsize;
size_t tomove, moved;
int error, dowritefaf;
pmp = MPTOPUFFSMP(vp->v_mount);
bp = ap->a_bp;
error = 0;
dowritefaf = 0;
pn = VPTOPP(vp);
if (((bp->b_flags & B_READ) && !EXISTSOP(pmp, READ))
|| (((bp->b_flags & B_READ) == 0) && !EXISTSOP(pmp, WRITE))) {
error = EOPNOTSUPP;
goto out;
}
/*
* Short-circuit optimization: don't flush buffer in between
* VOP_INACTIVE and VOP_RECLAIM in case the node has no references.
*/
if (pn->pn_stat & PNODE_NOREFS) {
bp->b_resid = 0;
goto out;
}
#ifdef DIAGNOSTIC
if (bp->b_bcount > pmp->pmp_req_maxsize - PUFFS_REQSTRUCT_MAX)
panic("puffs_strategy: wildly inappropriate buf bcount %d",
bp->b_bcount);
#endif
/*
* See explanation for the necessity of a FAF in puffs_fsync.
*
* Also, do FAF in case we're suspending.
* See puffs_vfsops.c:pageflush()
*
* XXgoddamnX: B_WRITE is a "pseudo flag"
*/
if ((bp->b_flags & B_READ) == 0) {
simple_lock(&vp->v_interlock);
if (vp->v_flag & VXLOCK)
dowritefaf = 1;
if (pn->pn_stat & PNODE_SUSPEND)
dowritefaf = 1;
simple_unlock(&vp->v_interlock);
}
if (bp->b_flags & B_ASYNC)
dowritefaf = 1;
#ifdef DIAGNOSTIC
if (curproc == uvm.pagedaemon_proc)
KASSERT(dowritefaf);
#endif
tomove = PUFFS_TOMOVE(bp->b_bcount, pmp);
if ((bp->b_flags & (B_READ | B_ASYNC)) == (B_READ | B_ASYNC)) {
argsize = sizeof(struct puffs_vnreq_read);
read_argp = malloc(argsize + tomove,
M_PUFFS, M_NOWAIT | M_ZERO);
if (read_argp == NULL) {
error = ENOMEM;
goto out;
}
read_argp->pvnr_ioflag = 0;
read_argp->pvnr_resid = tomove;
read_argp->pvnr_offset = bp->b_blkno << DEV_BSHIFT;
puffs_credcvt(&read_argp->pvnr_cred, FSCRED);
puffs_vntouser_call(pmp, PUFFS_VN_READ, read_argp,
argsize, tomove, VPTOPNC(vp),
puffs_parkdone_asyncbioread, bp,
LOCKEDVP(vp), NULL);
error = 0;
goto wayout;
} else if (bp->b_flags & B_READ) {
argsize = sizeof(struct puffs_vnreq_read);
read_argp = malloc(argsize + tomove,
M_PUFFS, M_WAITOK | M_ZERO);
read_argp->pvnr_ioflag = 0;
read_argp->pvnr_resid = tomove;
read_argp->pvnr_offset = bp->b_blkno << DEV_BSHIFT;
puffs_credcvt(&read_argp->pvnr_cred, FSCRED);
error = puffs_vntouser(pmp, PUFFS_VN_READ,
read_argp, argsize, tomove,
VPTOPNC(vp), LOCKEDVP(vp), NULL);
if (error)
goto out;
if (read_argp->pvnr_resid > tomove) {
error = EINVAL;
goto out;
}
moved = tomove - read_argp->pvnr_resid;
(void)memcpy(bp->b_data, read_argp->pvnr_data, moved);
bp->b_resid = bp->b_bcount - moved;
} else {
/*
* make pages read-only before we write them if we want
* write caching info
*/
if (PUFFS_WCACHEINFO(pmp)) {
struct uvm_object *uobj = &vp->v_uobj;
int npages = (bp->b_bcount + PAGE_SIZE-1) >> PAGE_SHIFT;
struct vm_page *vmp;
int i;
for (i = 0; i < npages; i++) {
vmp= uvm_pageratop((vaddr_t)bp->b_data
+ (i << PAGE_SHIFT));
DPRINTF(("puffs_strategy: write-protecting "
"vp %p page %p, offset %" PRId64"\n",
vp, vmp, vmp->offset));
simple_lock(&uobj->vmobjlock);
vmp->flags |= PG_RDONLY;
pmap_page_protect(vmp, VM_PROT_READ);
simple_unlock(&uobj->vmobjlock);
}
}
argsize = sizeof(struct puffs_vnreq_write) + bp->b_bcount;
write_argp = malloc(argsize, M_PUFFS, M_NOWAIT | M_ZERO);
if (write_argp == NULL) {
error = ENOMEM;
goto out;
}
write_argp->pvnr_ioflag = 0;
write_argp->pvnr_resid = tomove;
write_argp->pvnr_offset = bp->b_blkno << DEV_BSHIFT;
puffs_credcvt(&write_argp->pvnr_cred, FSCRED);
(void)memcpy(&write_argp->pvnr_data, bp->b_data, tomove);
if (dowritefaf) {
/*
* assume FAF moves everything. frankly, we don't
* really have a choice.
*/
puffs_vntouser_faf(MPTOPUFFSMP(vp->v_mount),
PUFFS_VN_WRITE, write_argp, argsize, VPTOPNC(vp));
bp->b_resid = bp->b_bcount - tomove;
} else {
error = puffs_vntouser(MPTOPUFFSMP(vp->v_mount),
PUFFS_VN_WRITE, write_argp, argsize, 0, VPTOPNC(vp),
vp, NULL);
if (error)
goto out;
moved = tomove - write_argp->pvnr_resid;
if (write_argp->pvnr_resid > tomove) {
error = EINVAL;
goto out;
}
bp->b_resid = bp->b_bcount - moved;
if (write_argp->pvnr_resid != 0)
error = EIO;
}
}
out:
if (read_argp)
free(read_argp, M_PUFFS);
if (write_argp && !dowritefaf)
free(write_argp, M_PUFFS);
if (error) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
}
if ((bp->b_flags & (B_READ | B_ASYNC)) != (B_READ | B_ASYNC))
biodone(bp);
wayout:
return error;
}
int
puffs_mmap(void *v)
{
struct vop_mmap_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_fflags;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct puffs_mount *pmp;
int error;
PUFFS_VNREQ(mmap);
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
if (!PUFFS_DOCACHE(pmp))
return genfs_eopnotsupp(v);
if (EXISTSOP(pmp, MMAP)) {
mmap_arg.pvnr_fflags = ap->a_fflags;
puffs_credcvt(&mmap_arg.pvnr_cred, ap->a_cred);
mmap_arg.pvnr_pid = puffs_lwp2pid(ap->a_l);
error = puffs_vntouser(pmp, PUFFS_VN_MMAP,
&mmap_arg, sizeof(mmap_arg), 0,
VPTOPNC(ap->a_vp), NULL, NULL);
} else {
error = genfs_mmap(v);
}
return error;
}
/*
* The rest don't get a free trip to userspace and back, they
* have to stay within the kernel.
*/
/*
* bmap doesn't really make any sense for puffs, so just 1:1 map it.
* well, maybe somehow, somewhere, some day ....
*/
int
puffs_bmap(void *v)
{
struct vop_bmap_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap = v;
struct puffs_mount *pmp;
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
if (ap->a_vpp)
*ap->a_vpp = ap->a_vp;
if (ap->a_bnp)
*ap->a_bnp = ap->a_bn;
if (ap->a_runp)
*ap->a_runp
= (PUFFS_TOMOVE(pmp->pmp_req_maxsize, pmp)>>DEV_BSHIFT) - 1;
return 0;
}
/*
* Handle getpages faults in puffs. We let genfs_getpages() do most
* of the dirty work, but we come in this route to do accounting tasks.
* If the user server has specified functions for cache notifications
* about reads and/or writes, we record which type of operation we got,
* for which page range, and proceed to issue a FAF notification to the
* server about it.
*/
int
puffs_getpages(void *v)
{
struct vop_getpages_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
voff_t a_offset;
struct vm_page **a_m;
int *a_count;
int a_centeridx;
vm_prot_t a_access_type;
int a_advice;
int a_flags;
} */ *ap = v;
struct puffs_mount *pmp;
struct vnode *vp;
struct vm_page **pgs;
struct puffs_cacheinfo *pcinfo = NULL;
struct puffs_cacherun *pcrun;
void *parkmem = NULL;
size_t runsizes;
int i, npages, si, streakon;
int error, locked, write;
pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
npages = *ap->a_count;
pgs = ap->a_m;
vp = ap->a_vp;
locked = (ap->a_flags & PGO_LOCKED) != 0;
write = (ap->a_access_type & VM_PROT_WRITE) != 0;
/* ccg xnaht - gets Wuninitialized wrong */
pcrun = NULL;
runsizes = 0;
if (write && PUFFS_WCACHEINFO(pmp)) {
/* allocate worst-case memory */
runsizes = ((npages / 2) + 1) * sizeof(struct puffs_cacherun);
pcinfo = malloc(sizeof(struct puffs_cacheinfo) + runsizes,
M_PUFFS, M_ZERO | locked ? M_NOWAIT : M_WAITOK);
/*
* can't block if we're locked and can't mess up caching
* information for fs server. so come back later, please
*/
if (pcinfo == NULL) {
error = ENOMEM;
goto out;
}
parkmem = puffs_park_alloc(locked == 0);
if (parkmem == NULL) {
error = ENOMEM;
goto out;
}
pcrun = pcinfo->pcache_runs;
}
error = genfs_getpages(v);
if (error)
goto out;
if (PUFFS_WCACHEINFO(pmp) == 0)
goto out;
/*
* Let's see whose fault it was and inform the user server of
* possibly read/written pages. Map pages from read faults
* strictly read-only, since otherwise we might miss info on
* when the page is actually write-faulted to.
*/
if (!locked)
simple_lock(&vp->v_uobj.vmobjlock);
for (i = 0, si = 0, streakon = 0; i < npages; i++) {
if (pgs[i] == NULL || pgs[i] == PGO_DONTCARE) {
if (streakon && write) {
streakon = 0;
pcrun[si].pcache_runend
= trunc_page(pgs[i]->offset) + PAGE_MASK;
si++;
}
continue;
}
if (streakon == 0 && write) {
streakon = 1;
pcrun[si].pcache_runstart = pgs[i]->offset;
}
if (!write)
pgs[i]->flags |= PG_RDONLY;
}
/* was the last page part of our streak? */
if (streakon) {
pcrun[si].pcache_runend
= trunc_page(pgs[i-1]->offset) + PAGE_MASK;
si++;
}
if (!locked)
simple_unlock(&vp->v_uobj.vmobjlock);
KASSERT(si <= (npages / 2) + 1);
/* send results to userspace */
if (write)
puffs_cacheop(pmp, parkmem, pcinfo,
sizeof(struct puffs_cacheinfo) + runsizes, VPTOPNC(vp));
out:
if (error) {
if (pcinfo != NULL)
free(pcinfo, M_PUFFS);
if (parkmem != NULL)
puffs_park_release(parkmem, 1);
}
return error;
}
int
puffs_lock(void *v)
{
struct vop_lock_args /* {
struct vnode *a_vp;
int a_flags;
}<7D>*/ *ap = v;
struct vnode *vp = ap->a_vp;
struct mount *mp = vp->v_mount;
#if 0
DPRINTF(("puffs_lock: lock %p, args 0x%x\n", vp, ap->a_flags));
#endif
/*
* XXX: this avoids deadlocking when we're suspending.
* e.g. some ops holding the vnode lock might be blocked for
* the vfs transaction lock so we'd deadlock.
*
* Now once again this is skating on the thin ice of modern life,
* since we are breaking the consistency guarantee provided
* _to the user server_ by vnode locking. Hopefully this will
* get fixed soon enough by getting rid of the dependency on
* vnode locks alltogether.
*/
if (fstrans_is_owner(mp) && fstrans_getstate(mp) == FSTRANS_SUSPENDING){
if (ap->a_flags & LK_INTERLOCK)
simple_unlock(&vp->v_interlock);
return 0;
}
return lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock);
}
int
puffs_unlock(void *v)
{
struct vop_unlock_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct mount *mp = vp->v_mount;
#if 0
DPRINTF(("puffs_unlock: lock %p, args 0x%x\n", vp, ap->a_flags));
#endif
/* XXX: see puffs_lock() */
if (fstrans_is_owner(mp) && fstrans_getstate(mp) == FSTRANS_SUSPENDING){
if (ap->a_flags & LK_INTERLOCK)
simple_unlock(&vp->v_interlock);
return 0;
}
return lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock);
}
int
puffs_islocked(void *v)
{
struct vop_islocked_args *ap = v;
int rv;
rv = lockstatus(&ap->a_vp->v_lock);
return rv;
}
int
puffs_generic(void *v)
{
struct vop_generic_args *ap = v;
(void)ap;
DPRINTF(("puffs_generic: ap->a_desc = %s\n", ap->a_desc->vdesc_name));
return EOPNOTSUPP;
}
/*
* spec & fifo. These call the miscfs spec and fifo vectors, but issue
* FAF update information for the puffs node first.
*/
int
puffs_spec_read(void *v)
{
struct vop_read_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
puffs_updatenode(ap->a_vp, PUFFS_UPDATEATIME);
return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v);
}
int
puffs_spec_write(void *v)
{
struct vop_write_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
}<7D>*/ *ap = v;
puffs_updatenode(ap->a_vp, PUFFS_UPDATEMTIME);
return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v);
}
int
puffs_fifo_read(void *v)
{
struct vop_read_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
puffs_updatenode(ap->a_vp, PUFFS_UPDATEATIME);
return VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), v);
}
int
puffs_fifo_write(void *v)
{
struct vop_write_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
}<7D>*/ *ap = v;
puffs_updatenode(ap->a_vp, PUFFS_UPDATEMTIME);
return VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), v);
}
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