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minix/sys/fs/puffs/puffs_vnops.c
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC) 
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

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/* $NetBSD: puffs_vnops.c,v 1.177 2013/10/17 21:03:27 christos 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.
*
* 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 1.177 2013/10/17 21:03:27 christos Exp $");
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/lockf.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/kernel.h> /* For hz, hardclock_ticks */
#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_vnop_lookup(void *);
int puffs_vnop_create(void *);
int puffs_vnop_access(void *);
int puffs_vnop_mknod(void *);
int puffs_vnop_open(void *);
int puffs_vnop_close(void *);
int puffs_vnop_getattr(void *);
int puffs_vnop_setattr(void *);
int puffs_vnop_reclaim(void *);
int puffs_vnop_readdir(void *);
int puffs_vnop_poll(void *);
int puffs_vnop_fsync(void *);
int puffs_vnop_seek(void *);
int puffs_vnop_remove(void *);
int puffs_vnop_mkdir(void *);
int puffs_vnop_rmdir(void *);
int puffs_vnop_link(void *);
int puffs_vnop_readlink(void *);
int puffs_vnop_symlink(void *);
int puffs_vnop_rename(void *);
int puffs_vnop_read(void *);
int puffs_vnop_write(void *);
int puffs_vnop_fcntl(void *);
int puffs_vnop_ioctl(void *);
int puffs_vnop_inactive(void *);
int puffs_vnop_print(void *);
int puffs_vnop_pathconf(void *);
int puffs_vnop_advlock(void *);
int puffs_vnop_strategy(void *);
int puffs_vnop_bmap(void *);
int puffs_vnop_mmap(void *);
int puffs_vnop_getpages(void *);
int puffs_vnop_abortop(void *);
int puffs_vnop_getextattr(void *);
int puffs_vnop_setextattr(void *);
int puffs_vnop_listextattr(void *);
int puffs_vnop_deleteextattr(void *);
int puffs_vnop_spec_read(void *);
int puffs_vnop_spec_write(void *);
int puffs_vnop_fifo_read(void *);
int puffs_vnop_fifo_write(void *);
int puffs_vnop_checkop(void *);
#define puffs_vnop_lock genfs_lock
#define puffs_vnop_unlock genfs_unlock
#define puffs_vnop_islocked genfs_islocked
int (**puffs_vnodeop_p)(void *);
const struct vnodeopv_entry_desc puffs_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, puffs_vnop_lookup }, /* REAL lookup */
{ &vop_create_desc, puffs_vnop_checkop }, /* create */
{ &vop_mknod_desc, puffs_vnop_checkop }, /* mknod */
{ &vop_open_desc, puffs_vnop_open }, /* REAL open */
{ &vop_close_desc, puffs_vnop_checkop }, /* close */
{ &vop_access_desc, puffs_vnop_access }, /* REAL access */
{ &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */
{ &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */
{ &vop_read_desc, puffs_vnop_checkop }, /* read */
{ &vop_write_desc, puffs_vnop_checkop }, /* write */
{ &vop_fsync_desc, puffs_vnop_fsync }, /* REAL fsync */
{ &vop_seek_desc, puffs_vnop_checkop }, /* seek */
{ &vop_remove_desc, puffs_vnop_checkop }, /* remove */
{ &vop_link_desc, puffs_vnop_checkop }, /* link */
{ &vop_rename_desc, puffs_vnop_checkop }, /* rename */
{ &vop_mkdir_desc, puffs_vnop_checkop }, /* mkdir */
{ &vop_rmdir_desc, puffs_vnop_checkop }, /* rmdir */
{ &vop_symlink_desc, puffs_vnop_checkop }, /* symlink */
{ &vop_readdir_desc, puffs_vnop_checkop }, /* readdir */
{ &vop_readlink_desc, puffs_vnop_checkop }, /* readlink */
{ &vop_getpages_desc, puffs_vnop_checkop }, /* getpages */
{ &vop_putpages_desc, genfs_putpages }, /* REAL putpages */
{ &vop_pathconf_desc, puffs_vnop_checkop }, /* pathconf */
{ &vop_advlock_desc, puffs_vnop_advlock }, /* advlock */
{ &vop_strategy_desc, puffs_vnop_strategy }, /* REAL strategy */
{ &vop_revoke_desc, genfs_revoke }, /* REAL revoke */
{ &vop_abortop_desc, puffs_vnop_abortop }, /* REAL abortop */
{ &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */
{ &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */
{ &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */
{ &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */
{ &vop_bmap_desc, puffs_vnop_bmap }, /* REAL bmap */
{ &vop_print_desc, puffs_vnop_print }, /* REAL print */
{ &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */
{ &vop_bwrite_desc, genfs_nullop }, /* REAL bwrite */
{ &vop_mmap_desc, puffs_vnop_mmap }, /* REAL mmap */
{ &vop_poll_desc, puffs_vnop_poll }, /* REAL poll */
{ &vop_getextattr_desc, puffs_vnop_getextattr }, /* getextattr */
{ &vop_setextattr_desc, puffs_vnop_setextattr }, /* setextattr */
{ &vop_listextattr_desc, puffs_vnop_listextattr }, /* listextattr */
{ &vop_deleteextattr_desc, puffs_vnop_deleteextattr },/* deleteextattr */
#if 0
{ &vop_openextattr_desc, puffs_vnop_checkop }, /* openextattr */
{ &vop_closeextattr_desc, puffs_vnop_checkop }, /* closeextattr */
#endif
{ &vop_kqfilter_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_vnop_checkop }, /* access */
{ &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */
{ &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */
{ &vop_read_desc, puffs_vnop_spec_read }, /* update, read */
{ &vop_write_desc, puffs_vnop_spec_write }, /* update, write */
{ &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 }, /* spec_mmap */
{ &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_vnop_inactive }, /* REAL inactive */
{ &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */
{ &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */
{ &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */
{ &vop_bmap_desc, spec_bmap }, /* dummy */
{ &vop_strategy_desc, spec_strategy }, /* dev strategy */
{ &vop_print_desc, puffs_vnop_print }, /* REAL print */
{ &vop_islocked_desc, puffs_vnop_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 */
{ &vop_getextattr_desc, puffs_vnop_checkop }, /* getextattr */
{ &vop_setextattr_desc, puffs_vnop_checkop }, /* setextattr */
{ &vop_listextattr_desc, puffs_vnop_checkop }, /* listextattr */
{ &vop_deleteextattr_desc, puffs_vnop_checkop },/* deleteextattr */
#if 0
{ &vop_openextattr_desc, _openextattr }, /* openextattr */
{ &vop_closeextattr_desc, _closeextattr }, /* closeextattr */
#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, vn_fifo_bypass }, /* lookup, ENOTDIR */
{ &vop_create_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_mknod_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_open_desc, vn_fifo_bypass }, /* open */
{ &vop_close_desc, vn_fifo_bypass }, /* close */
{ &vop_access_desc, puffs_vnop_checkop }, /* access */
{ &vop_getattr_desc, puffs_vnop_checkop }, /* getattr */
{ &vop_setattr_desc, puffs_vnop_checkop }, /* setattr */
{ &vop_read_desc, puffs_vnop_fifo_read }, /* read, update */
{ &vop_write_desc, puffs_vnop_fifo_write }, /* write, update */
{ &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */
{ &vop_fcntl_desc, genfs_fcntl }, /* dummy */
{ &vop_poll_desc, vn_fifo_bypass }, /* poll */
{ &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */
{ &vop_revoke_desc, vn_fifo_bypass }, /* genfs_revoke */
{ &vop_mmap_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_fsync_desc, vn_fifo_bypass }, /* genfs_nullop*/
{ &vop_seek_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_remove_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_link_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_rename_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_mkdir_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_rmdir_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_symlink_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_readdir_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_readlink_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_abortop_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_inactive_desc, puffs_vnop_inactive }, /* REAL inactive */
{ &vop_reclaim_desc, puffs_vnop_reclaim }, /* REAL reclaim */
{ &vop_lock_desc, puffs_vnop_lock }, /* REAL lock */
{ &vop_unlock_desc, puffs_vnop_unlock }, /* REAL unlock */
{ &vop_bmap_desc, vn_fifo_bypass }, /* dummy */
{ &vop_strategy_desc, vn_fifo_bypass }, /* genfs_badop */
{ &vop_print_desc, puffs_vnop_print }, /* REAL print */
{ &vop_islocked_desc, puffs_vnop_islocked }, /* REAL islocked */
{ &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */
{ &vop_advlock_desc, vn_fifo_bypass }, /* genfs_einval */
{ &vop_bwrite_desc, vn_bwrite }, /* bwrite */
{ &vop_putpages_desc, vn_fifo_bypass }, /* genfs_null_putpages*/
#if 0
{ &vop_openextattr_desc, _openextattr }, /* openextattr */
{ &vop_closeextattr_desc, _closeextattr }, /* closeextattr */
#endif
{ &vop_getextattr_desc, puffs_vnop_checkop }, /* getextattr */
{ &vop_setextattr_desc, puffs_vnop_checkop }, /* setextattr */
{ &vop_listextattr_desc, puffs_vnop_checkop }, /* listextattr */
{ &vop_deleteextattr_desc, puffs_vnop_checkop }, /* deleteextattr */
{ 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_vnop_create }, /* create */
{ &vop_mknod_desc, puffs_vnop_mknod }, /* mknod */
{ &vop_open_desc, puffs_vnop_open }, /* open */
{ &vop_close_desc, puffs_vnop_close }, /* close */
{ &vop_access_desc, puffs_vnop_access }, /* access */
{ &vop_getattr_desc, puffs_vnop_getattr }, /* getattr */
{ &vop_setattr_desc, puffs_vnop_setattr }, /* setattr */
{ &vop_read_desc, puffs_vnop_read }, /* read */
{ &vop_write_desc, puffs_vnop_write }, /* write */
{ &vop_seek_desc, puffs_vnop_seek }, /* seek */
{ &vop_remove_desc, puffs_vnop_remove }, /* remove */
{ &vop_link_desc, puffs_vnop_link }, /* link */
{ &vop_rename_desc, puffs_vnop_rename }, /* rename */
{ &vop_mkdir_desc, puffs_vnop_mkdir }, /* mkdir */
{ &vop_rmdir_desc, puffs_vnop_rmdir }, /* rmdir */
{ &vop_symlink_desc, puffs_vnop_symlink }, /* symlink */
{ &vop_readdir_desc, puffs_vnop_readdir }, /* readdir */
{ &vop_readlink_desc, puffs_vnop_readlink }, /* readlink */
{ &vop_print_desc, puffs_vnop_print }, /* print */
{ &vop_islocked_desc, puffs_vnop_islocked }, /* islocked */
{ &vop_pathconf_desc, puffs_vnop_pathconf }, /* pathconf */
{ &vop_getpages_desc, puffs_vnop_getpages }, /* getpages */
{ NULL, NULL }
};
const struct vnodeopv_desc puffs_msgop_opv_desc =
{ &puffs_msgop_p, puffs_msgop_entries };
/*
* for dosetattr / update_va
*/
#define SETATTR_CHSIZE 0x01
#define SETATTR_ASYNC 0x02
#define ERROUT(err) \
do { \
error = err; \
goto out; \
} while (/*CONSTCOND*/0)
/*
* 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_vnop_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, rv;
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);
DPRINTF_VERBOSE(("checkop call %s (%d), vp %p\n",
ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp));
if (!ALLOPS(pmp)) {
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(GETEXTATTR);
CHECKOP_NOTSUPP(SETEXTATTR);
CHECKOP_NOTSUPP(LISTEXTATTR);
CHECKOP_NOTSUPP(DELETEEXTATTR);
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);
}
}
rv = VOCALL(puffs_msgop_p, ap->a_desc->vdesc_offset, v);
DPRINTF_VERBOSE(("checkop return %s (%d), vp %p: %d\n",
ap->a_desc->vdesc_name, ap->a_desc->vdesc_offset, vp, rv));
return rv;
}
static int callremove(struct puffs_mount *, puffs_cookie_t, puffs_cookie_t,
struct componentname *);
static int callrmdir(struct puffs_mount *, puffs_cookie_t, puffs_cookie_t,
struct componentname *);
static void callinactive(struct puffs_mount *, puffs_cookie_t, int);
static void callreclaim(struct puffs_mount *, puffs_cookie_t, int);
static int flushvncache(struct vnode *, off_t, off_t, bool);
static void update_va(struct vnode *, struct vattr *, struct vattr *,
struct timespec *, struct timespec *, int);
static void update_parent(struct vnode *, struct vnode *);
#define PUFFS_ABORT_LOOKUP 1
#define PUFFS_ABORT_CREATE 2
#define PUFFS_ABORT_MKNOD 3
#define PUFFS_ABORT_MKDIR 4
#define PUFFS_ABORT_SYMLINK 5
/*
* Press the pani^Wabort button! Kernel resource allocation failed.
*/
static void
puffs_abortbutton(struct puffs_mount *pmp, int what,
puffs_cookie_t dck, puffs_cookie_t ck, struct componentname *cnp)
{
switch (what) {
case PUFFS_ABORT_CREATE:
case PUFFS_ABORT_MKNOD:
case PUFFS_ABORT_SYMLINK:
callremove(pmp, dck, ck, cnp);
break;
case PUFFS_ABORT_MKDIR:
callrmdir(pmp, dck, ck, cnp);
break;
}
callinactive(pmp, ck, 0);
callreclaim(pmp, ck, 1);
}
/*
* Begin vnode operations.
*
* A word from the keymaster about locks: generally we don't want
* to use the vnode locks at all: it creates an ugly dependency between
* the userlandia file server and the kernel. But we'll play along with
* the kernel vnode locks for now. However, even currently we attempt
* to release locks as early as possible. This is possible for some
* operations which a) don't need a locked vnode after the userspace op
* and b) return with the vnode unlocked. Theoretically we could
* unlock-do op-lock for others and order the graph in userspace, but I
* don't want to think of the consequences for the time being.
*/
#define TTL_TO_TIMEOUT(ts) \
(hardclock_ticks + (ts->tv_sec * hz) + (ts->tv_nsec * hz / 1000000000))
#define TTL_VALID(ts) \
((ts != NULL) && !((ts->tv_sec == 0) && (ts->tv_nsec == 0)))
#define TIMED_OUT(expire) \
((int)((unsigned int)hardclock_ticks - (unsigned int)expire) > 0)
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, lookup);
struct puffs_mount *pmp;
struct componentname *cnp;
struct vnode *vp, *dvp, *cvp;
struct puffs_node *dpn, *cpn;
int isdot;
int error;
pmp = MPTOPUFFSMP(ap->a_dvp->v_mount);
cnp = ap->a_cnp;
dvp = ap->a_dvp;
cvp = NULL;
cpn = NULL;
*ap->a_vpp = NULL;
/* r/o fs? we check create later to handle EEXIST */
if ((cnp->cn_flags & ISLASTCN)
&& (dvp->v_mount->mnt_flag & MNT_RDONLY)
&& (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return EROFS;
isdot = cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.';
DPRINTF(("puffs_lookup: \"%s\", parent vnode %p, op: %x\n",
cnp->cn_nameptr, dvp, cnp->cn_nameiop));
/*
* If dotdot cache is enabled, unlock parent, lock ..
* (grand-parent) and relock parent.
*/
if (PUFFS_USE_DOTDOTCACHE(pmp) && (cnp->cn_flags & ISDOTDOT)) {
VOP_UNLOCK(dvp);
vp = VPTOPP(ap->a_dvp)->pn_parent;
vref(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
*ap->a_vpp = vp;
return 0;
}
/*
* Check if someone fed it into the cache
*/
if (!isdot && PUFFS_USE_NAMECACHE(pmp)) {
int found, iswhiteout;
found = cache_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_nameiop, cnp->cn_flags,
&iswhiteout, ap->a_vpp);
if (iswhiteout) {
cnp->cn_flags |= ISWHITEOUT;
}
if (found && *ap->a_vpp != NULLVP && PUFFS_USE_FS_TTL(pmp)) {
cvp = *ap->a_vpp;
cpn = VPTOPP(cvp);
if (TIMED_OUT(cpn->pn_cn_timeout)) {
cache_purge(cvp);
/*
* cached vnode (cvp) is still locked
* so that we can reuse it upon a new
* successful lookup.
*/
*ap->a_vpp = NULL;
found = 0;
}
}
/*
* Do not use negative caching, since the filesystem
* provides no TTL for it.
*/
if (found && *ap->a_vpp == NULLVP && PUFFS_USE_FS_TTL(pmp))
found = 0;
if (found) {
return *ap->a_vpp == NULLVP ? ENOENT : 0;
}
/*
* This is what would have been left in ERROR before
* the rearrangement of cache_lookup(). What with all
* the macros, I am not sure if this is a dead value
* below or not.
*/
error = -1;
}
if (isdot) {
/* deal with rename lookup semantics */
if (cnp->cn_nameiop == RENAME && (cnp->cn_flags & ISLASTCN))
return EISDIR;
vp = ap->a_dvp;
vref(vp);
*ap->a_vpp = vp;
return 0;
}
if (cvp != NULL)
mutex_enter(&cpn->pn_sizemtx);
PUFFS_MSG_ALLOC(vn, lookup);
puffs_makecn(&lookup_msg->pvnr_cn, &lookup_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
if (cnp->cn_flags & ISDOTDOT)
VOP_UNLOCK(dvp);
puffs_msg_setinfo(park_lookup, PUFFSOP_VN,
PUFFS_VN_LOOKUP, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_lookup, dvp->v_data, NULL, error);
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) {
error = checkerr(pmp, error, __func__);
if (error == ENOENT) {
/* don't allow to create files on r/o fs */
if ((dvp->v_mount->mnt_flag & MNT_RDONLY)
&& cnp->cn_nameiop == CREATE) {
error = EROFS;
/* adjust values if we are creating */
} else if ((cnp->cn_flags & ISLASTCN)
&& (cnp->cn_nameiop == CREATE
|| cnp->cn_nameiop == RENAME)) {
error = EJUSTRETURN;
/* save negative cache entry */
} else {
if (PUFFS_USE_NAMECACHE(pmp) &&
!PUFFS_USE_FS_TTL(pmp))
cache_enter(dvp, NULL, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_flags);
}
}
goto out;
}
/*
* Check that we don't get our parent node back, that would cause
* a pretty obvious deadlock.
*/
dpn = dvp->v_data;
if (lookup_msg->pvnr_newnode == dpn->pn_cookie) {
puffs_senderr(pmp, PUFFS_ERR_LOOKUP, EINVAL,
"lookup produced parent cookie", lookup_msg->pvnr_newnode);
error = EPROTO;
goto out;
}
/*
* Check if we looked up the cached vnode
*/
vp = NULL;
if (cvp && (VPTOPP(cvp)->pn_cookie == lookup_msg->pvnr_newnode)) {
int grace;
/*
* Bump grace time of this node so that it does not get
* reclaimed too fast. We try to increase a bit more the
* lifetime of busiest * nodes - with some limits.
*/
grace = 10 * puffs_sopreq_expire_timeout;
cpn->pn_cn_grace = hardclock_ticks + grace;
vp = cvp;
}
/*
* No cached vnode available, or the cached vnode does not
* match the userland cookie anymore: is the node known?
*/
if (vp == NULL) {
error = puffs_cookie2vnode(pmp, lookup_msg->pvnr_newnode,
1, 1, &vp);
}
if (error == PUFFS_NOSUCHCOOKIE) {
error = puffs_getvnode(dvp->v_mount,
lookup_msg->pvnr_newnode, lookup_msg->pvnr_vtype,
lookup_msg->pvnr_size, lookup_msg->pvnr_rdev, &vp);
if (error) {
puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP,
VPTOPNC(dvp), lookup_msg->pvnr_newnode,
ap->a_cnp);
goto out;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
} else if (error) {
puffs_abortbutton(pmp, PUFFS_ABORT_LOOKUP, VPTOPNC(dvp),
lookup_msg->pvnr_newnode, ap->a_cnp);
goto out;
}
/*
* Update cache and TTL
*/
if (PUFFS_USE_FS_TTL(pmp)) {
struct timespec *va_ttl = &lookup_msg->pvnr_va_ttl;
struct timespec *cn_ttl = &lookup_msg->pvnr_cn_ttl;
update_va(vp, NULL, &lookup_msg->pvnr_va,
va_ttl, cn_ttl, SETATTR_CHSIZE);
}
KASSERT(lookup_msg->pvnr_newnode == VPTOPP(vp)->pn_cookie);
*ap->a_vpp = vp;
if (PUFFS_USE_NAMECACHE(pmp))
cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_flags);
/* XXX */
if ((lookup_msg->pvnr_cn.pkcn_flags & REQUIREDIR) == 0)
cnp->cn_flags &= ~REQUIREDIR;
if (lookup_msg->pvnr_cn.pkcn_consume)
cnp->cn_consume = MIN(lookup_msg->pvnr_cn.pkcn_consume,
strlen(cnp->cn_nameptr) - cnp->cn_namelen);
VPTOPP(vp)->pn_nlookup++;
if (PUFFS_USE_DOTDOTCACHE(pmp) &&
(VPTOPP(vp)->pn_parent != dvp))
update_parent(vp, dvp);
out:
if (cvp != NULL) {
mutex_exit(&cpn->pn_sizemtx);
if (error || (cvp != vp))
vput(cvp);
}
if (cnp->cn_flags & ISDOTDOT)
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
DPRINTF(("puffs_lookup: returning %d %p\n", error, *ap->a_vpp));
PUFFS_MSG_RELEASE(lookup);
return error;
}
#define REFPN_AND_UNLOCKVP(a, b) \
do { \
mutex_enter(&b->pn_mtx); \
puffs_referencenode(b); \
mutex_exit(&b->pn_mtx); \
VOP_UNLOCK(a); \
} while (/*CONSTCOND*/0)
#define REFPN(b) \
do { \
mutex_enter(&b->pn_mtx); \
puffs_referencenode(b); \
mutex_exit(&b->pn_mtx); \
} while (/*CONSTCOND*/0)
#define RELEPN_AND_VP(a, b) \
do { \
puffs_releasenode(b); \
vrele(a); \
} while (/*CONSTCOND*/0)
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, create);
struct vnode *dvp = ap->a_dvp;
struct puffs_node *dpn = VPTOPP(dvp);
struct componentname *cnp = ap->a_cnp;
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(mp);
int error;
DPRINTF(("puffs_create: dvp %p, cnp: %s\n",
dvp, ap->a_cnp->cn_nameptr));
PUFFS_MSG_ALLOC(vn, create);
puffs_makecn(&create_msg->pvnr_cn, &create_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
create_msg->pvnr_va = *ap->a_vap;
puffs_msg_setinfo(park_create, PUFFSOP_VN,
PUFFS_VN_CREATE, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_create, dvp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
error = puffs_newnode(mp, dvp, ap->a_vpp,
create_msg->pvnr_newnode, cnp, ap->a_vap->va_type, 0);
if (error) {
puffs_abortbutton(pmp, PUFFS_ABORT_CREATE, dpn->pn_cookie,
create_msg->pvnr_newnode, cnp);
goto out;
}
if (PUFFS_USE_FS_TTL(pmp)) {
struct timespec *va_ttl = &create_msg->pvnr_va_ttl;
struct timespec *cn_ttl = &create_msg->pvnr_cn_ttl;
struct vattr *rvap = &create_msg->pvnr_va;
update_va(*ap->a_vpp, NULL, rvap,
va_ttl, cn_ttl, SETATTR_CHSIZE);
}
VPTOPP(*ap->a_vpp)->pn_nlookup++;
if (PUFFS_USE_DOTDOTCACHE(pmp) &&
(VPTOPP(*ap->a_vpp)->pn_parent != dvp))
update_parent(*ap->a_vpp, dvp);
out:
vput(dvp);
DPRINTF(("puffs_create: return %d\n", error));
PUFFS_MSG_RELEASE(create);
return error;
}
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, mknod);
struct vnode *dvp = ap->a_dvp;
struct puffs_node *dpn = VPTOPP(dvp);
struct componentname *cnp = ap->a_cnp;
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(mp);
int error;
PUFFS_MSG_ALLOC(vn, mknod);
puffs_makecn(&mknod_msg->pvnr_cn, &mknod_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
mknod_msg->pvnr_va = *ap->a_vap;
puffs_msg_setinfo(park_mknod, PUFFSOP_VN,
PUFFS_VN_MKNOD, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mknod, dvp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
error = puffs_newnode(mp, dvp, ap->a_vpp,
mknod_msg->pvnr_newnode, cnp, ap->a_vap->va_type,
ap->a_vap->va_rdev);
if (error) {
puffs_abortbutton(pmp, PUFFS_ABORT_MKNOD, dpn->pn_cookie,
mknod_msg->pvnr_newnode, cnp);
goto out;
}
if (PUFFS_USE_FS_TTL(pmp)) {
struct timespec *va_ttl = &mknod_msg->pvnr_va_ttl;
struct timespec *cn_ttl = &mknod_msg->pvnr_cn_ttl;
struct vattr *rvap = &mknod_msg->pvnr_va;
update_va(*ap->a_vpp, NULL, rvap,
va_ttl, cn_ttl, SETATTR_CHSIZE);
}
VPTOPP(*ap->a_vpp)->pn_nlookup++;
if (PUFFS_USE_DOTDOTCACHE(pmp) &&
(VPTOPP(*ap->a_vpp)->pn_parent != dvp))
update_parent(*ap->a_vpp, dvp);
out:
vput(dvp);
PUFFS_MSG_RELEASE(mknod);
return error;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, open);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int mode = ap->a_mode;
int error;
DPRINTF(("puffs_open: vp %p, mode 0x%x\n", vp, mode));
if (vp->v_type == VREG && mode & FWRITE && !EXISTSOP(pmp, WRITE))
ERROUT(EROFS);
if (!EXISTSOP(pmp, OPEN))
ERROUT(0);
PUFFS_MSG_ALLOC(vn, open);
open_msg->pvnr_mode = mode;
puffs_credcvt(&open_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_open, PUFFSOP_VN,
PUFFS_VN_OPEN, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_open, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
out:
DPRINTF(("puffs_open: returning %d\n", error));
PUFFS_MSG_RELEASE(open);
return error;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, close);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
PUFFS_MSG_ALLOC(vn, close);
puffs_msg_setfaf(park_close);
close_msg->pvnr_fflag = ap->a_fflag;
puffs_credcvt(&close_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_close, PUFFSOP_VN,
PUFFS_VN_CLOSE, VPTOPNC(vp));
puffs_msg_enqueue(pmp, park_close);
PUFFS_MSG_RELEASE(close);
return 0;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, access);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int mode = ap->a_mode;
int error;
if (mode & VWRITE) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
if ((vp->v_mount->mnt_flag & MNT_RDONLY)
|| !EXISTSOP(pmp, WRITE))
return EROFS;
break;
default:
break;
}
}
if (!EXISTSOP(pmp, ACCESS))
return 0;
PUFFS_MSG_ALLOC(vn, access);
access_msg->pvnr_mode = ap->a_mode;
puffs_credcvt(&access_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_access, PUFFSOP_VN,
PUFFS_VN_ACCESS, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_access, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
PUFFS_MSG_RELEASE(access);
return error;
}
static void
update_va(struct vnode *vp, struct vattr *vap, struct vattr *rvap,
struct timespec *va_ttl, struct timespec *cn_ttl, int flags)
{
struct puffs_node *pn = VPTOPP(vp);
if (TTL_VALID(cn_ttl)) {
pn->pn_cn_timeout = TTL_TO_TIMEOUT(cn_ttl);
pn->pn_cn_grace = MAX(pn->pn_cn_timeout, pn->pn_cn_grace);
}
/*
* Don't listen to the file server regarding special device
* size info, the file server doesn't know anything about them.
*/
if (vp->v_type == VBLK || vp->v_type == VCHR)
rvap->va_size = vp->v_size;
/* Ditto for blocksize (ufs comment: this doesn't belong here) */
if (vp->v_type == VBLK)
rvap->va_blocksize = BLKDEV_IOSIZE;
else if (vp->v_type == VCHR)
rvap->va_blocksize = MAXBSIZE;
if (vap != NULL) {
(void) memcpy(vap, rvap, sizeof(struct vattr));
vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0];
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;
}
if (!(pn->pn_stat & PNODE_METACACHE_SIZE) && (flags & SETATTR_CHSIZE)) {
if (rvap->va_size != VNOVAL
&& vp->v_type != VBLK && vp->v_type != VCHR) {
uvm_vnp_setsize(vp, rvap->va_size);
pn->pn_serversize = rvap->va_size;
}
}
if ((va_ttl != NULL) && TTL_VALID(va_ttl)) {
if (pn->pn_va_cache == NULL)
pn->pn_va_cache = pool_get(&puffs_vapool, PR_WAITOK);
(void)memcpy(pn->pn_va_cache, rvap, sizeof(*rvap));
pn->pn_va_timeout = TTL_TO_TIMEOUT(va_ttl);
}
}
static void
update_parent(struct vnode *vp, struct vnode *dvp)
{
struct puffs_node *pn = VPTOPP(vp);
if (pn->pn_parent != NULL) {
KASSERT(pn->pn_parent != dvp);
vrele(pn->pn_parent);
}
vref(dvp);
pn->pn_parent = dvp;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, getattr);
struct vnode *vp = ap->a_vp;
struct mount *mp = vp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(mp);
struct vattr *vap, *rvap;
struct puffs_node *pn = VPTOPP(vp);
struct timespec *va_ttl = NULL;
int error = 0;
/*
* A lock is required so that we do not race with
* setattr, write and fsync when changing vp->v_size.
* This is critical, since setting a stall smaler value
* triggers a file truncate in uvm_vnp_setsize(), which
* most of the time means data corruption (a chunk of
* data is replaced by zeroes). This can be removed if
* we decide one day that VOP_GETATTR must operate on
* a locked vnode.
*
* XXX Should be useless now that VOP_GETATTR has been
* fixed to always require a shared lock at least.
*/
mutex_enter(&pn->pn_sizemtx);
REFPN(pn);
vap = ap->a_vap;
if (PUFFS_USE_FS_TTL(pmp)) {
if (!TIMED_OUT(pn->pn_va_timeout)) {
update_va(vp, vap, pn->pn_va_cache,
NULL, NULL, SETATTR_CHSIZE);
goto out2;
}
}
PUFFS_MSG_ALLOC(vn, getattr);
vattr_null(&getattr_msg->pvnr_va);
puffs_credcvt(&getattr_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_getattr, PUFFSOP_VN,
PUFFS_VN_GETATTR, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_getattr, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
rvap = &getattr_msg->pvnr_va;
if (PUFFS_USE_FS_TTL(pmp))
va_ttl = &getattr_msg->pvnr_va_ttl;
update_va(vp, vap, rvap, va_ttl, NULL, SETATTR_CHSIZE);
out:
PUFFS_MSG_RELEASE(getattr);
out2:
puffs_releasenode(pn);
mutex_exit(&pn->pn_sizemtx);
return error;
}
static int
dosetattr(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, int flags)
{
PUFFS_MSG_VARS(vn, setattr);
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct puffs_node *pn = vp->v_data;
int error = 0;
KASSERT(!(flags & SETATTR_CHSIZE) || mutex_owned(&pn->pn_sizemtx));
if ((vp->v_mount->mnt_flag & MNT_RDONLY) &&
(vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL
|| vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL
|| vap->va_mode != (mode_t)VNOVAL))
return EROFS;
if ((vp->v_mount->mnt_flag & MNT_RDONLY)
&& vp->v_type == VREG && vap->va_size != VNOVAL)
return EROFS;
/*
* 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;
}
/*
* Flush attribute cache so that another thread do
* not get a stale value during the operation.
*/
if (PUFFS_USE_FS_TTL(pmp))
pn->pn_va_timeout = 0;
PUFFS_MSG_ALLOC(vn, setattr);
(void)memcpy(&setattr_msg->pvnr_va, vap, sizeof(struct vattr));
puffs_credcvt(&setattr_msg->pvnr_cred, cred);
puffs_msg_setinfo(park_setattr, PUFFSOP_VN,
PUFFS_VN_SETATTR, VPTOPNC(vp));
if (flags & SETATTR_ASYNC)
puffs_msg_setfaf(park_setattr);
puffs_msg_enqueue(pmp, park_setattr);
if ((flags & SETATTR_ASYNC) == 0)
error = puffs_msg_wait2(pmp, park_setattr, vp->v_data, NULL);
if ((error == 0) && PUFFS_USE_FS_TTL(pmp)) {
struct timespec *va_ttl = &setattr_msg->pvnr_va_ttl;
struct vattr *rvap = &setattr_msg->pvnr_va;
update_va(vp, NULL, rvap, va_ttl, NULL, flags);
}
PUFFS_MSG_RELEASE(setattr);
if ((flags & SETATTR_ASYNC) == 0) {
error = checkerr(pmp, error, __func__);
if (error)
return error;
} else {
error = 0;
}
if (vap->va_size != VNOVAL) {
pn->pn_serversize = vap->va_size;
if (flags & SETATTR_CHSIZE)
uvm_vnp_setsize(vp, vap->va_size);
}
return 0;
}
int
puffs_vnop_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;
} */ *ap = v;
struct puffs_node *pn = ap->a_vp->v_data;
int error;
mutex_enter(&pn->pn_sizemtx);
error = dosetattr(ap->a_vp, ap->a_vap, ap->a_cred, SETATTR_CHSIZE);
mutex_exit(&pn->pn_sizemtx);
return error;
}
static __inline int
doinact(struct puffs_mount *pmp, int iaflag)
{
if (EXISTSOP(pmp, INACTIVE))
if (pmp->pmp_flags & PUFFS_KFLAG_IAONDEMAND)
if (iaflag || ALLOPS(pmp))
return 1;
else
return 0;
else
return 1;
else
return 0;
}
static void
callinactive(struct puffs_mount *pmp, puffs_cookie_t ck, int iaflag)
{
PUFFS_MSG_VARS(vn, inactive);
if (doinact(pmp, iaflag)) {
PUFFS_MSG_ALLOC(vn, inactive);
puffs_msg_setinfo(park_inactive, PUFFSOP_VN,
PUFFS_VN_INACTIVE, ck);
PUFFS_MSG_ENQUEUEWAIT_NOERROR(pmp, park_inactive);
PUFFS_MSG_RELEASE(inactive);
}
}
/* XXX: callinactive can't setback */
int
puffs_vnop_inactive(void *v)
{
struct vop_inactive_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
} */ *ap = v;
PUFFS_MSG_VARS(vn, inactive);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct puffs_node *pnode;
bool recycle = false;
pnode = vp->v_data;
mutex_enter(&pnode->pn_sizemtx);
if (doinact(pmp, pnode->pn_stat & PNODE_DOINACT)) {
flushvncache(vp, 0, 0, false);
PUFFS_MSG_ALLOC(vn, inactive);
puffs_msg_setinfo(park_inactive, PUFFSOP_VN,
PUFFS_VN_INACTIVE, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2_NOERROR(pmp, park_inactive, vp->v_data,
NULL);
PUFFS_MSG_RELEASE(inactive);
}
pnode->pn_stat &= ~PNODE_DOINACT;
/*
* file server thinks it's gone? then don't be afraid care,
* node's life was already all it would ever be
*/
if (pnode->pn_stat & PNODE_NOREFS) {
pnode->pn_stat |= PNODE_DYING;
recycle = true;
}
/*
* Handle node TTL.
* If grace has already timed out, make it reclaimed.
* Otherwise, we queue its expiration by sop thread, so
* that it does not remain for ages in the freelist,
* holding memory in userspace, while we will have
* to look it up again anyway.
*/
if (PUFFS_USE_FS_TTL(pmp) && !(vp->v_vflag & VV_ROOT) && !recycle) {
bool incache = !TIMED_OUT(pnode->pn_cn_timeout);
bool ingrace = !TIMED_OUT(pnode->pn_cn_grace);
bool reclaimqueued = pnode->pn_stat & PNODE_SOPEXP;
if (!incache && !ingrace && !reclaimqueued) {
pnode->pn_stat |= PNODE_DYING;
recycle = true;
}
if (!recycle && !reclaimqueued) {
struct puffs_sopreq *psopr;
int at = MAX(pnode->pn_cn_grace, pnode->pn_cn_timeout);
KASSERT(curlwp != uvm.pagedaemon_lwp);
psopr = kmem_alloc(sizeof(*psopr), KM_SLEEP);
psopr->psopr_ck = VPTOPNC(pnode->pn_vp);
psopr->psopr_sopreq = PUFFS_SOPREQ_EXPIRE;
psopr->psopr_at = at;
mutex_enter(&pmp->pmp_sopmtx);
/*
* If thread has disapeared, just give up. The
* fs is being unmounted and the node will be
* be reclaimed anyway.
*
* Otherwise, we queue the request but do not
* immediatly signal the thread, as the node
* has not been expired yet.
*/
if (pmp->pmp_sopthrcount == 0) {
kmem_free(psopr, sizeof(*psopr));
} else {
TAILQ_INSERT_TAIL(&pmp->pmp_sopnodereqs,
psopr, psopr_entries);
pnode->pn_stat |= PNODE_SOPEXP;
}
mutex_exit(&pmp->pmp_sopmtx);
}
}
*ap->a_recycle = recycle;
mutex_exit(&pnode->pn_sizemtx);
VOP_UNLOCK(vp);
return 0;
}
static void
callreclaim(struct puffs_mount *pmp, puffs_cookie_t ck, int nlookup)
{
PUFFS_MSG_VARS(vn, reclaim);
if (!EXISTSOP(pmp, RECLAIM))
return;
PUFFS_MSG_ALLOC(vn, reclaim);
reclaim_msg->pvnr_nlookup = nlookup;
puffs_msg_setfaf(park_reclaim);
puffs_msg_setinfo(park_reclaim, PUFFSOP_VN, PUFFS_VN_RECLAIM, ck);
puffs_msg_enqueue(pmp, park_reclaim);
PUFFS_MSG_RELEASE(reclaim);
return;
}
/*
* always FAF, we don't really care if the server wants to fail to
* reclaim the node or not
*/
int
puffs_vnop_reclaim(void *v)
{
struct vop_reclaim_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct puffs_node *pnode = vp->v_data;
bool notifyserver = true;
/*
* 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 (vp->v_vflag & VV_ROOT) {
mutex_enter(&pmp->pmp_lock);
KASSERT(pmp->pmp_root != NULL);
pmp->pmp_root = NULL;
mutex_exit(&pmp->pmp_lock);
notifyserver = false;
}
/*
* purge info from kernel before issueing FAF, since we
* don't really know when we'll get around to it after
* that and someone might race us into node creation
*/
mutex_enter(&pmp->pmp_lock);
LIST_REMOVE(pnode, pn_hashent);
if (PUFFS_USE_NAMECACHE(pmp))
cache_purge(vp);
mutex_exit(&pmp->pmp_lock);
if (notifyserver) {
int nlookup = VPTOPP(vp)->pn_nlookup;
callreclaim(MPTOPUFFSMP(vp->v_mount), VPTOPNC(vp), nlookup);
}
if (PUFFS_USE_DOTDOTCACHE(pmp)) {
if (__predict_true(VPTOPP(vp)->pn_parent != NULL))
vrele(VPTOPP(vp)->pn_parent);
else
KASSERT(vp->v_vflag & VV_ROOT);
}
puffs_putvnode(vp);
vp->v_data = NULL;
return 0;
}
#define CSIZE sizeof(**ap->a_cookies)
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, readdir);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
size_t argsize, tomove, cookiemem, cookiesmax;
struct uio *uio = ap->a_uio;
size_t howmuch, resid;
int error;
/*
* ok, so we need: resid + cookiemem = maxreq
* => resid + cookiesize * (resid/minsize) = maxreq
* => resid + cookiesize/minsize * resid = maxreq
* => (cookiesize/minsize + 1) * resid = maxreq
* => resid = maxreq / (cookiesize/minsize + 1)
*
* Since cookiesize <= minsize and we're not very big on floats,
* we approximate that to be 1. Therefore:
*
* resid = maxreq / 2;
*
* Well, at least we didn't have to use differential equations
* or the Gram-Schmidt process.
*
* (yes, I'm very afraid of this)
*/
KASSERT(CSIZE <= _DIRENT_MINSIZE((struct dirent *)0));
if (ap->a_cookies) {
KASSERT(ap->a_ncookies != NULL);
if (pmp->pmp_args.pa_fhsize == 0)
return EOPNOTSUPP;
resid = PUFFS_TOMOVE(uio->uio_resid, pmp) / 2;
cookiesmax = resid/_DIRENT_MINSIZE((struct dirent *)0);
cookiemem = ALIGN(cookiesmax*CSIZE); /* play safe */
} else {
resid = PUFFS_TOMOVE(uio->uio_resid, pmp);
cookiesmax = 0;
cookiemem = 0;
}
argsize = sizeof(struct puffs_vnmsg_readdir);
tomove = resid + cookiemem;
puffs_msgmem_alloc(argsize + tomove, &park_readdir,
(void *)&readdir_msg, 1);
puffs_credcvt(&readdir_msg->pvnr_cred, ap->a_cred);
readdir_msg->pvnr_offset = uio->uio_offset;
readdir_msg->pvnr_resid = resid;
readdir_msg->pvnr_ncookies = cookiesmax;
readdir_msg->pvnr_eofflag = 0;
readdir_msg->pvnr_dentoff = cookiemem;
puffs_msg_setinfo(park_readdir, PUFFSOP_VN,
PUFFS_VN_READDIR, VPTOPNC(vp));
puffs_msg_setdelta(park_readdir, tomove);
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readdir, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
/* userspace is cheating? */
if (readdir_msg->pvnr_resid > resid) {
puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG,
"resid grew", VPTOPNC(vp));
ERROUT(EPROTO);
}
if (readdir_msg->pvnr_ncookies > cookiesmax) {
puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG,
"too many cookies", VPTOPNC(vp));
ERROUT(EPROTO);
}
/* check eof */
if (readdir_msg->pvnr_eofflag)
*ap->a_eofflag = 1;
/* bouncy-wouncy with the directory data */
howmuch = resid - readdir_msg->pvnr_resid;
/* force eof if no data was returned (getcwd() needs this) */
if (howmuch == 0) {
*ap->a_eofflag = 1;
goto out;
}
error = uiomove(readdir_msg->pvnr_data + cookiemem, howmuch, uio);
if (error)
goto out;
/* provide cookies to caller if so desired */
if (ap->a_cookies) {
KASSERT(curlwp != uvm.pagedaemon_lwp);
*ap->a_cookies = malloc(readdir_msg->pvnr_ncookies*CSIZE,
M_TEMP, M_WAITOK);
*ap->a_ncookies = readdir_msg->pvnr_ncookies;
memcpy(*ap->a_cookies, readdir_msg->pvnr_data,
*ap->a_ncookies*CSIZE);
}
/* next readdir starts here */
uio->uio_offset = readdir_msg->pvnr_offset;
out:
puffs_msgmem_release(park_readdir);
return error;
}
#undef CSIZE
/*
* poll works by consuming the bitmask in pn_revents. If there are
* events available, poll returns immediately. If not, it issues a
* poll to userspace, selrecords itself and returns with no available
* events. When the file server returns, it executes puffs_parkdone_poll(),
* where available events are added to the bitmask. selnotify() is
* then also executed by that function causing us to enter here again
* and hopefully find the missing bits (unless someone got them first,
* in which case it starts all over again).
*/
int
puffs_vnop_poll(void *v)
{
struct vop_poll_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_events;
} */ *ap = v;
PUFFS_MSG_VARS(vn, poll);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct puffs_node *pn = vp->v_data;
int events;
if (EXISTSOP(pmp, POLL)) {
mutex_enter(&pn->pn_mtx);
events = pn->pn_revents & ap->a_events;
if (events & ap->a_events) {
pn->pn_revents &= ~ap->a_events;
mutex_exit(&pn->pn_mtx);
return events;
} else {
puffs_referencenode(pn);
mutex_exit(&pn->pn_mtx);
PUFFS_MSG_ALLOC(vn, poll);
poll_msg->pvnr_events = ap->a_events;
puffs_msg_setinfo(park_poll, PUFFSOP_VN,
PUFFS_VN_POLL, VPTOPNC(vp));
puffs_msg_setcall(park_poll, puffs_parkdone_poll, pn);
selrecord(curlwp, &pn->pn_sel);
PUFFS_MSG_ENQUEUEWAIT2_NOERROR(pmp, park_poll,
vp->v_data, NULL);
PUFFS_MSG_RELEASE(poll);
return 0;
}
} else {
return genfs_poll(v);
}
}
static int
flushvncache(struct vnode *vp, off_t offlo, off_t offhi, bool wait)
{
struct puffs_node *pn = VPTOPP(vp);
struct vattr va;
int pflags, error;
/* flush out information from our metacache, see vop_setattr */
if (pn->pn_stat & PNODE_METACACHE_MASK
&& (pn->pn_stat & PNODE_DYING) == 0) {
vattr_null(&va);
error = dosetattr(vp, &va, FSCRED,
SETATTR_CHSIZE | (wait ? 0 : SETATTR_ASYNC));
if (error)
return error;
}
/*
* flush pages to avoid being overly dirty
*/
pflags = PGO_CLEANIT;
if (wait)
pflags |= PGO_SYNCIO;
mutex_enter(vp->v_interlock);
return VOP_PUTPAGES(vp, trunc_page(offlo), round_page(offhi), pflags);
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, fsync);
struct vnode *vp;
struct puffs_node *pn;
struct puffs_mount *pmp;
int error, dofaf;
vp = ap->a_vp;
KASSERT(vp != NULL);
pn = VPTOPP(vp);
KASSERT(pn != NULL);
pmp = MPTOPUFFSMP(vp->v_mount);
if (ap->a_flags & FSYNC_WAIT) {
mutex_enter(&pn->pn_sizemtx);
} else {
if (mutex_tryenter(&pn->pn_sizemtx) == 0)
return EDEADLK;
}
error = flushvncache(vp, ap->a_offlo, ap->a_offhi,
(ap->a_flags & FSYNC_WAIT) == FSYNC_WAIT);
if (error)
goto out;
/*
* 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.
*/
error = 0;
if (!EXISTSOP(pmp, FSYNC) || (pn->pn_stat & PNODE_DYING))
goto out;
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) {
mutex_enter(vp->v_interlock);
if (vp->v_iflag & VI_XLOCK)
dofaf = 1;
mutex_exit(vp->v_interlock);
}
PUFFS_MSG_ALLOC(vn, fsync);
if (dofaf)
puffs_msg_setfaf(park_fsync);
puffs_credcvt(&fsync_msg->pvnr_cred, ap->a_cred);
fsync_msg->pvnr_flags = ap->a_flags;
fsync_msg->pvnr_offlo = ap->a_offlo;
fsync_msg->pvnr_offhi = ap->a_offhi;
puffs_msg_setinfo(park_fsync, PUFFSOP_VN,
PUFFS_VN_FSYNC, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_fsync, vp->v_data, NULL, error);
PUFFS_MSG_RELEASE(fsync);
error = checkerr(pmp, error, __func__);
out:
mutex_exit(&pn->pn_sizemtx);
return error;
}
int
puffs_vnop_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_MSG_VARS(vn, seek);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int error;
PUFFS_MSG_ALLOC(vn, seek);
seek_msg->pvnr_oldoff = ap->a_oldoff;
seek_msg->pvnr_newoff = ap->a_newoff;
puffs_credcvt(&seek_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_seek, PUFFSOP_VN,
PUFFS_VN_SEEK, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_seek, vp->v_data, NULL, error);
PUFFS_MSG_RELEASE(seek);
return checkerr(pmp, error, __func__);
}
static int
callremove(struct puffs_mount *pmp, puffs_cookie_t dck, puffs_cookie_t ck,
struct componentname *cnp)
{
PUFFS_MSG_VARS(vn, remove);
int error;
PUFFS_MSG_ALLOC(vn, remove);
remove_msg->pvnr_cookie_targ = ck;
puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setinfo(park_remove, PUFFSOP_VN, PUFFS_VN_REMOVE, dck);
PUFFS_MSG_ENQUEUEWAIT(pmp, park_remove, error);
PUFFS_MSG_RELEASE(remove);
return checkerr(pmp, error, __func__);
}
/*
* XXX: can't use callremove now because can't catch setbacks with
* it due to lack of a pnode argument.
*/
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, remove);
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct puffs_node *dpn = VPTOPP(dvp);
struct puffs_node *pn = VPTOPP(vp);
struct componentname *cnp = ap->a_cnp;
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(mp);
int error;
PUFFS_MSG_ALLOC(vn, remove);
remove_msg->pvnr_cookie_targ = VPTOPNC(vp);
puffs_makecn(&remove_msg->pvnr_cn, &remove_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setinfo(park_remove, PUFFSOP_VN,
PUFFS_VN_REMOVE, VPTOPNC(dvp));
puffs_msg_enqueue(pmp, park_remove);
REFPN_AND_UNLOCKVP(dvp, dpn);
if (dvp == vp)
REFPN(pn);
else
REFPN_AND_UNLOCKVP(vp, pn);
error = puffs_msg_wait2(pmp, park_remove, dpn, pn);
PUFFS_MSG_RELEASE(remove);
RELEPN_AND_VP(dvp, dpn);
RELEPN_AND_VP(vp, pn);
error = checkerr(pmp, error, __func__);
return error;
}
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, mkdir);
struct vnode *dvp = ap->a_dvp;
struct puffs_node *dpn = VPTOPP(dvp);
struct componentname *cnp = ap->a_cnp;
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(mp);
int error;
PUFFS_MSG_ALLOC(vn, mkdir);
puffs_makecn(&mkdir_msg->pvnr_cn, &mkdir_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
mkdir_msg->pvnr_va = *ap->a_vap;
puffs_msg_setinfo(park_mkdir, PUFFSOP_VN,
PUFFS_VN_MKDIR, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mkdir, dvp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
error = puffs_newnode(mp, dvp, ap->a_vpp,
mkdir_msg->pvnr_newnode, cnp, VDIR, 0);
if (error) {
puffs_abortbutton(pmp, PUFFS_ABORT_MKDIR, dpn->pn_cookie,
mkdir_msg->pvnr_newnode, cnp);
goto out;
}
if (PUFFS_USE_FS_TTL(pmp)) {
struct timespec *va_ttl = &mkdir_msg->pvnr_va_ttl;
struct timespec *cn_ttl = &mkdir_msg->pvnr_cn_ttl;
struct vattr *rvap = &mkdir_msg->pvnr_va;
update_va(*ap->a_vpp, NULL, rvap,
va_ttl, cn_ttl, SETATTR_CHSIZE);
}
VPTOPP(*ap->a_vpp)->pn_nlookup++;
if (PUFFS_USE_DOTDOTCACHE(pmp) &&
(VPTOPP(*ap->a_vpp)->pn_parent != dvp))
update_parent(*ap->a_vpp, dvp);
out:
vput(dvp);
PUFFS_MSG_RELEASE(mkdir);
return error;
}
static int
callrmdir(struct puffs_mount *pmp, puffs_cookie_t dck, puffs_cookie_t ck,
struct componentname *cnp)
{
PUFFS_MSG_VARS(vn, rmdir);
int error;
PUFFS_MSG_ALLOC(vn, rmdir);
rmdir_msg->pvnr_cookie_targ = ck;
puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setinfo(park_rmdir, PUFFSOP_VN, PUFFS_VN_RMDIR, dck);
PUFFS_MSG_ENQUEUEWAIT(pmp, park_rmdir, error);
PUFFS_MSG_RELEASE(rmdir);
return checkerr(pmp, error, __func__);
}
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, rmdir);
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct puffs_node *dpn = VPTOPP(dvp);
struct puffs_node *pn = VPTOPP(vp);
struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount);
struct componentname *cnp = ap->a_cnp;
int error;
PUFFS_MSG_ALLOC(vn, rmdir);
rmdir_msg->pvnr_cookie_targ = VPTOPNC(vp);
puffs_makecn(&rmdir_msg->pvnr_cn, &rmdir_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setinfo(park_rmdir, PUFFSOP_VN,
PUFFS_VN_RMDIR, VPTOPNC(dvp));
puffs_msg_enqueue(pmp, park_rmdir);
REFPN_AND_UNLOCKVP(dvp, dpn);
REFPN_AND_UNLOCKVP(vp, pn);
error = puffs_msg_wait2(pmp, park_rmdir, dpn, pn);
PUFFS_MSG_RELEASE(rmdir);
/* XXX: some call cache_purge() *for both vnodes* here, investigate */
RELEPN_AND_VP(dvp, dpn);
RELEPN_AND_VP(vp, pn);
return error;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, link);
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct puffs_node *dpn = VPTOPP(dvp);
struct puffs_node *pn = VPTOPP(vp);
struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount);
struct componentname *cnp = ap->a_cnp;
int error;
PUFFS_MSG_ALLOC(vn, link);
link_msg->pvnr_cookie_targ = VPTOPNC(vp);
puffs_makecn(&link_msg->pvnr_cn, &link_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setinfo(park_link, PUFFSOP_VN,
PUFFS_VN_LINK, VPTOPNC(dvp));
puffs_msg_enqueue(pmp, park_link);
REFPN_AND_UNLOCKVP(dvp, dpn);
REFPN(pn);
error = puffs_msg_wait2(pmp, park_link, dpn, pn);
PUFFS_MSG_RELEASE(link);
error = checkerr(pmp, error, __func__);
/*
* 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(pn, PUFFS_UPDATECTIME, 0);
RELEPN_AND_VP(dvp, dpn);
puffs_releasenode(pn);
return error;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, symlink);
struct vnode *dvp = ap->a_dvp;
struct puffs_node *dpn = VPTOPP(dvp);
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount);
struct componentname *cnp = ap->a_cnp;
int error;
*ap->a_vpp = NULL;
PUFFS_MSG_ALLOC(vn, symlink);
puffs_makecn(&symlink_msg->pvnr_cn, &symlink_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
symlink_msg->pvnr_va = *ap->a_vap;
(void)strlcpy(symlink_msg->pvnr_link, ap->a_target,
sizeof(symlink_msg->pvnr_link));
puffs_msg_setinfo(park_symlink, PUFFSOP_VN,
PUFFS_VN_SYMLINK, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_symlink, dvp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
error = puffs_newnode(mp, dvp, ap->a_vpp,
symlink_msg->pvnr_newnode, cnp, VLNK, 0);
if (error) {
puffs_abortbutton(pmp, PUFFS_ABORT_SYMLINK, dpn->pn_cookie,
symlink_msg->pvnr_newnode, cnp);
goto out;
}
if (PUFFS_USE_FS_TTL(pmp)) {
struct timespec *va_ttl = &symlink_msg->pvnr_va_ttl;
struct timespec *cn_ttl = &symlink_msg->pvnr_cn_ttl;
struct vattr *rvap = &symlink_msg->pvnr_va;
update_va(*ap->a_vpp, NULL, rvap,
va_ttl, cn_ttl, SETATTR_CHSIZE);
}
VPTOPP(*ap->a_vpp)->pn_nlookup++;
if (PUFFS_USE_DOTDOTCACHE(pmp) &&
(VPTOPP(*ap->a_vpp)->pn_parent != dvp))
update_parent(*ap->a_vpp, dvp);
out:
vput(dvp);
PUFFS_MSG_RELEASE(symlink);
return error;
}
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, readlink);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(ap->a_vp->v_mount);
size_t linklen;
int error;
PUFFS_MSG_ALLOC(vn, readlink);
puffs_credcvt(&readlink_msg->pvnr_cred, ap->a_cred);
linklen = sizeof(readlink_msg->pvnr_link);
readlink_msg->pvnr_linklen = linklen;
puffs_msg_setinfo(park_readlink, PUFFSOP_VN,
PUFFS_VN_READLINK, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readlink, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
/* bad bad user file server */
if (readlink_msg->pvnr_linklen > linklen) {
puffs_senderr(pmp, PUFFS_ERR_READLINK, E2BIG,
"linklen too big", VPTOPNC(ap->a_vp));
error = EPROTO;
goto out;
}
error = uiomove(&readlink_msg->pvnr_link, readlink_msg->pvnr_linklen,
ap->a_uio);
out:
PUFFS_MSG_RELEASE(readlink);
return error;
}
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, rename);
struct vnode *fdvp = ap->a_fdvp, *fvp = ap->a_fvp;
struct vnode *tdvp = ap->a_tdvp, *tvp = ap->a_tvp;
struct puffs_node *fpn = ap->a_fvp->v_data;
struct puffs_mount *pmp = MPTOPUFFSMP(fdvp->v_mount);
int error;
bool doabort = true;
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
ERROUT(EXDEV);
}
PUFFS_MSG_ALLOC(vn, rename);
rename_msg->pvnr_cookie_src = VPTOPNC(fvp);
rename_msg->pvnr_cookie_targdir = VPTOPNC(tdvp);
if (tvp)
rename_msg->pvnr_cookie_targ = VPTOPNC(tvp);
else
rename_msg->pvnr_cookie_targ = NULL;
puffs_makecn(&rename_msg->pvnr_cn_src, &rename_msg->pvnr_cn_src_cred,
ap->a_fcnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_makecn(&rename_msg->pvnr_cn_targ, &rename_msg->pvnr_cn_targ_cred,
ap->a_tcnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setinfo(park_rename, PUFFSOP_VN,
PUFFS_VN_RENAME, VPTOPNC(fdvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rename, fdvp->v_data, NULL, error);
doabort = false;
PUFFS_MSG_RELEASE(rename);
error = checkerr(pmp, error, __func__);
/*
* 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(fpn, PUFFS_UPDATECTIME, 0);
if (PUFFS_USE_DOTDOTCACHE(pmp) &&
(VPTOPP(fvp)->pn_parent != tdvp))
update_parent(fvp, tdvp);
}
out:
if (doabort)
VOP_ABORTOP(tdvp, ap->a_tcnp);
if (tvp != NULL)
vput(tvp);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (doabort)
VOP_ABORTOP(fdvp, ap->a_fcnp);
vrele(fdvp);
vrele(fvp);
return error;
}
#define RWARGS(cont, iofl, move, offset, creds) \
(cont)->pvnr_ioflag = (iofl); \
(cont)->pvnr_resid = (move); \
(cont)->pvnr_offset = (offset); \
puffs_credcvt(&(cont)->pvnr_cred, creds)
int
puffs_vnop_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_MSG_VARS(vn, read);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct uio *uio = ap->a_uio;
size_t tomove, argsize;
vsize_t bytelen;
int error;
read_msg = NULL;
error = 0;
/* std sanity */
if (uio->uio_resid == 0)
return 0;
if (uio->uio_offset < 0)
return EINVAL;
if (vp->v_type == VREG && PUFFS_USE_PAGECACHE(pmp)) {
const int advice = IO_ADV_DECODE(ap->a_ioflag);
while (uio->uio_resid > 0) {
if (vp->v_size <= uio->uio_offset) {
break;
}
bytelen = MIN(uio->uio_resid,
vp->v_size - uio->uio_offset);
if (bytelen == 0)
break;
error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
if (error)
break;
}
if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
puffs_updatenode(VPTOPP(vp), PUFFS_UPDATEATIME, 0);
} 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_vnmsg_read);
puffs_msgmem_alloc(argsize + tomove, &park_read,
(void *)&read_msg, 1);
error = 0;
while (uio->uio_resid > 0) {
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
memset(read_msg, 0, argsize); /* XXX: touser KASSERT */
RWARGS(read_msg, ap->a_ioflag, tomove,
uio->uio_offset, ap->a_cred);
puffs_msg_setinfo(park_read, PUFFSOP_VN,
PUFFS_VN_READ, VPTOPNC(vp));
puffs_msg_setdelta(park_read, tomove);
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_read, vp->v_data,
NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
break;
if (read_msg->pvnr_resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_READ,
E2BIG, "resid grew", VPTOPNC(ap->a_vp));
error = EPROTO;
break;
}
error = uiomove(read_msg->pvnr_data,
tomove - read_msg->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_msg->pvnr_resid)
break;
}
puffs_msgmem_release(park_read);
}
return error;
}
/*
* XXX: in case of a failure, this leaves uio in a bad state.
* We could theoretically copy the uio and iovecs and "replay"
* them the right amount after the userspace trip, but don't
* bother for now.
*/
int
puffs_vnop_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;
} */ *ap = v;
PUFFS_MSG_VARS(vn, write);
struct vnode *vp = ap->a_vp;
struct puffs_node *pn = VPTOPP(vp);
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct uio *uio = ap->a_uio;
size_t tomove, argsize;
off_t oldoff, newoff, origoff;
vsize_t bytelen;
int error, uflags;
int ubcflags;
error = uflags = 0;
write_msg = NULL;
mutex_enter(&pn->pn_sizemtx);
if (vp->v_type == VREG && PUFFS_USE_PAGECACHE(pmp)) {
ubcflags = UBC_WRITE | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp);
/*
* 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) {
if (vp->v_mount->mnt_flag & MNT_RELATIME)
uflags |= PUFFS_UPDATEATIME;
uflags |= PUFFS_UPDATECTIME;
uflags |= PUFFS_UPDATEMTIME;
oldoff = uio->uio_offset;
bytelen = uio->uio_resid;
newoff = oldoff + bytelen;
if (vp->v_size < newoff) {
uvm_vnp_setwritesize(vp, newoff);
}
error = ubc_uiomove(&vp->v_uobj, uio, bytelen,
UVM_ADV_RANDOM, ubcflags);
/*
* In case of a ubc_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.
*/
if (vp->v_size < newoff) {
if (error == 0) {
uflags |= PUFFS_UPDATESIZE;
uvm_vnp_setsize(vp, newoff);
} else {
uvm_vnp_setwritesize(vp, vp->v_size);
}
}
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) {
mutex_enter(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) {
mutex_enter(vp->v_interlock);
error = VOP_PUTPAGES(vp, trunc_page(origoff),
round_page(uio->uio_offset),
PGO_CLEANIT | PGO_SYNCIO);
/* write through page cache? */
} else if (error == 0 && pmp->pmp_flags & PUFFS_KFLAG_WTCACHE) {
mutex_enter(vp->v_interlock);
error = VOP_PUTPAGES(vp, trunc_page(origoff),
round_page(uio->uio_offset), PGO_CLEANIT);
}
puffs_updatenode(VPTOPP(vp), uflags, vp->v_size);
} else {
/* tomove is non-increasing */
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
argsize = sizeof(struct puffs_vnmsg_write) + tomove;
puffs_msgmem_alloc(argsize, &park_write, (void *)&write_msg,1);
while (uio->uio_resid > 0) {
/* move data to buffer */
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
memset(write_msg, 0, argsize); /* XXX: touser KASSERT */
RWARGS(write_msg, ap->a_ioflag, tomove,
uio->uio_offset, ap->a_cred);
error = uiomove(write_msg->pvnr_data, tomove, uio);
if (error)
break;
/* move buffer to userspace */
puffs_msg_setinfo(park_write, PUFFSOP_VN,
PUFFS_VN_WRITE, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_write, vp->v_data,
NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
break;
if (write_msg->pvnr_resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_WRITE,
E2BIG, "resid grew", VPTOPNC(ap->a_vp));
error = EPROTO;
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_msg->pvnr_resid != 0) {
error = EIO;
break;
}
}
puffs_msgmem_release(park_write);
}
mutex_exit(&pn->pn_sizemtx);
return error;
}
int
puffs_vnop_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
PUFFS_MSG_VARS(vn, print);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct puffs_node *pn = vp->v_data;
/* kernel portion */
printf("tag VT_PUFFS, vnode %p, puffs node: %p,\n"
"\tuserspace cookie: %p", vp, pn, pn->pn_cookie);
if (vp->v_type == VFIFO)
VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v);
printf("\n");
/* userspace portion */
if (EXISTSOP(pmp, PRINT)) {
PUFFS_MSG_ALLOC(vn, print);
puffs_msg_setinfo(park_print, PUFFSOP_VN,
PUFFS_VN_PRINT, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2_NOERROR(pmp, park_print, vp->v_data,
NULL);
PUFFS_MSG_RELEASE(print);
}
return 0;
}
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, pathconf);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int error;
PUFFS_MSG_ALLOC(vn, pathconf);
pathconf_msg->pvnr_name = ap->a_name;
puffs_msg_setinfo(park_pathconf, PUFFSOP_VN,
PUFFS_VN_PATHCONF, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_pathconf, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (!error)
*ap->a_retval = pathconf_msg->pvnr_retval;
PUFFS_MSG_RELEASE(pathconf);
return error;
}
int
puffs_vnop_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;
PUFFS_MSG_VARS(vn, advlock);
struct vnode *vp = ap->a_vp;
struct puffs_node *pn = VPTOPP(vp);
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int error;
if (!EXISTSOP(pmp, ADVLOCK))
return lf_advlock(ap, &pn->pn_lockf, vp->v_size);
PUFFS_MSG_ALLOC(vn, advlock);
(void)memcpy(&advlock_msg->pvnr_fl, ap->a_fl,
sizeof(advlock_msg->pvnr_fl));
advlock_msg->pvnr_id = ap->a_id;
advlock_msg->pvnr_op = ap->a_op;
advlock_msg->pvnr_flags = ap->a_flags;
puffs_msg_setinfo(park_advlock, PUFFSOP_VN,
PUFFS_VN_ADVLOCK, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_advlock, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
PUFFS_MSG_RELEASE(advlock);
return error;
}
int
puffs_vnop_abortop(void *v)
{
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
}; */ *ap = v;
PUFFS_MSG_VARS(vn, abortop);
struct vnode *dvp = ap->a_dvp;
struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount);
struct componentname *cnp = ap->a_cnp;
if (EXISTSOP(pmp, ABORTOP)) {
PUFFS_MSG_ALLOC(vn, abortop);
puffs_makecn(&abortop_msg->pvnr_cn, &abortop_msg->pvnr_cn_cred,
cnp, PUFFS_USE_FULLPNBUF(pmp));
puffs_msg_setfaf(park_abortop);
puffs_msg_setinfo(park_abortop, PUFFSOP_VN,
PUFFS_VN_ABORTOP, VPTOPNC(dvp));
puffs_msg_enqueue(pmp, park_abortop);
PUFFS_MSG_RELEASE(abortop);
}
return genfs_abortop(v);
}
#define BIOASYNC(bp) (bp->b_flags & B_ASYNC)
/*
* This maps itself to PUFFS_VN_READ/WRITE for data transfer.
*/
int
puffs_vnop_strategy(void *v)
{
struct vop_strategy_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct buf *a_bp;
} */ *ap = v;
PUFFS_MSG_VARS(vn, rw);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
struct puffs_node *pn;
struct buf *bp;
size_t argsize;
size_t tomove, moved;
int error, dofaf, cansleep, dobiodone;
pmp = MPTOPUFFSMP(vp->v_mount);
bp = ap->a_bp;
error = 0;
dofaf = 0;
cansleep = 0;
pn = VPTOPP(vp);
park_rw = NULL; /* explicit */
dobiodone = 1;
if ((BUF_ISREAD(bp) && !EXISTSOP(pmp, READ))
|| (BUF_ISWRITE(bp) && !EXISTSOP(pmp, WRITE)))
ERROUT(EOPNOTSUPP);
/*
* 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_DYING) {
KASSERT(BUF_ISWRITE(bp));
bp->b_resid = 0;
goto out;
}
#ifdef DIAGNOSTIC
if (bp->b_bcount > pmp->pmp_msg_maxsize - PUFFS_MSGSTRUCT_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()
*/
if (BUF_ISWRITE(bp)) {
mutex_enter(vp->v_interlock);
if (vp->v_iflag & VI_XLOCK)
dofaf = 1;
if (pn->pn_stat & PNODE_FAF)
dofaf = 1;
mutex_exit(vp->v_interlock);
}
cansleep = (curlwp == uvm.pagedaemon_lwp || dofaf) ? 0 : 1;
KASSERT(curlwp != uvm.pagedaemon_lwp || dofaf || BIOASYNC(bp));
/* allocate transport structure */
tomove = PUFFS_TOMOVE(bp->b_bcount, pmp);
argsize = sizeof(struct puffs_vnmsg_rw);
error = puffs_msgmem_alloc(argsize + tomove, &park_rw,
(void *)&rw_msg, cansleep);
if (error)
goto out;
RWARGS(rw_msg, 0, tomove, bp->b_blkno << DEV_BSHIFT, FSCRED);
/* 2x2 cases: read/write, faf/nofaf */
if (BUF_ISREAD(bp)) {
puffs_msg_setinfo(park_rw, PUFFSOP_VN,
PUFFS_VN_READ, VPTOPNC(vp));
puffs_msg_setdelta(park_rw, tomove);
if (BIOASYNC(bp)) {
puffs_msg_setcall(park_rw,
puffs_parkdone_asyncbioread, bp);
puffs_msg_enqueue(pmp, park_rw);
dobiodone = 0;
} else {
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data,
NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
if (rw_msg->pvnr_resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_READ,
E2BIG, "resid grew", VPTOPNC(vp));
ERROUT(EPROTO);
}
moved = tomove - rw_msg->pvnr_resid;
(void)memcpy(bp->b_data, rw_msg->pvnr_data, moved);
bp->b_resid = bp->b_bcount - moved;
}
} else {
puffs_msg_setinfo(park_rw, PUFFSOP_VN,
PUFFS_VN_WRITE, VPTOPNC(vp));
/*
* 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));
mutex_enter(uobj->vmobjlock);
vmp->flags |= PG_RDONLY;
pmap_page_protect(vmp, VM_PROT_READ);
mutex_exit(uobj->vmobjlock);
}
}
(void)memcpy(&rw_msg->pvnr_data, bp->b_data, tomove);
if (dofaf) {
puffs_msg_setfaf(park_rw);
} else if (BIOASYNC(bp)) {
puffs_msg_setcall(park_rw,
puffs_parkdone_asyncbiowrite, bp);
dobiodone = 0;
}
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rw, vp->v_data, NULL, error);
if (dobiodone == 0)
goto out;
/*
* XXXXXXXX: wrong, but kernel can't survive strategy
* failure currently. Here, have one more X: X.
*/
if (error != ENOMEM)
error = 0;
error = checkerr(pmp, error, __func__);
if (error)
goto out;
if (rw_msg->pvnr_resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_WRITE,
E2BIG, "resid grew", VPTOPNC(vp));
ERROUT(EPROTO);
}
/*
* FAF moved everything. Frankly, we don't
* really have a choice.
*/
if (dofaf && error == 0)
moved = tomove;
else
moved = tomove - rw_msg->pvnr_resid;
bp->b_resid = bp->b_bcount - moved;
if (bp->b_resid != 0) {
ERROUT(EIO);
}
}
out:
if (park_rw)
puffs_msgmem_release(park_rw);
if (error)
bp->b_error = error;
if (error || dobiodone)
biodone(bp);
return error;
}
int
puffs_vnop_mmap(void *v)
{
struct vop_mmap_args /* {
const struct vnodeop_desc *a_desc;
struct vnode *a_vp;
vm_prot_t a_prot;
kauth_cred_t a_cred;
} */ *ap = v;
PUFFS_MSG_VARS(vn, mmap);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int error;
if (!PUFFS_USE_PAGECACHE(pmp))
return genfs_eopnotsupp(v);
if (EXISTSOP(pmp, MMAP)) {
PUFFS_MSG_ALLOC(vn, mmap);
mmap_msg->pvnr_prot = ap->a_prot;
puffs_credcvt(&mmap_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_mmap, PUFFSOP_VN,
PUFFS_VN_MMAP, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mmap, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
PUFFS_MSG_RELEASE(mmap);
} 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_vnop_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_msg_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_vnop_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 puffs_node *pn;
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;
pn = vp->v_data;
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;
/*
* Check that we aren't trying to fault in pages which our file
* server doesn't know about. This happens if we extend a file by
* skipping some pages and later try to fault in pages which
* are between pn_serversize and vp_size. This check optimizes
* away the common case where a file is being extended.
*/
if (ap->a_offset >= pn->pn_serversize && ap->a_offset < vp->v_size) {
struct vattr va;
/* try again later when we can block */
if (locked)
ERROUT(EBUSY);
mutex_exit(vp->v_interlock);
vattr_null(&va);
va.va_size = vp->v_size;
error = dosetattr(vp, &va, FSCRED, 0);
if (error)
ERROUT(error);
mutex_enter(vp->v_interlock);
}
if (write && PUFFS_WCACHEINFO(pmp)) {
#ifdef notnowjohn
/* allocate worst-case memory */
runsizes = ((npages / 2) + 1) * sizeof(struct puffs_cacherun);
KASSERT(curlwp != uvm.pagedaemon_lwp || locked);
pcinfo = kmem_zalloc(sizeof(struct puffs_cacheinfo) + runsize,
locked ? KM_NOSLEEP : KM_SLEEP);
/*
* 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)
ERROUT(ENOMEM);
parkmem = puffs_park_alloc(locked == 0);
if (parkmem == NULL)
ERROUT(ENOMEM);
pcrun = pcinfo->pcache_runs;
#else
(void)parkmem;
#endif
}
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)
mutex_enter(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)
mutex_exit(vp->v_uobj.vmobjlock);
KASSERT(si <= (npages / 2) + 1);
#ifdef notnowjohn
/* send results to userspace */
if (write)
puffs_cacheop(pmp, parkmem, pcinfo,
sizeof(struct puffs_cacheinfo) + runsizes, VPTOPNC(vp));
#endif
out:
if (error) {
if (pcinfo != NULL)
kmem_free(pcinfo,
sizeof(struct puffs_cacheinfo) + runsizes);
#ifdef notnowjohn
if (parkmem != NULL)
puffs_park_release(parkmem, 1);
#endif
}
return error;
}
/*
* Extended attribute support.
*/
int
puffs_vnop_getextattr(void *v)
{
struct vop_getextattr_args /*
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
struct uio *a_uio;
size_t *a_size;
kauth_cred_t a_cred;
}; */ *ap = v;
PUFFS_MSG_VARS(vn, getextattr);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int attrnamespace = ap->a_attrnamespace;
const char *name = ap->a_name;
struct uio *uio = ap->a_uio;
size_t *sizep = ap->a_size;
size_t tomove, resid;
int error;
if (uio)
resid = uio->uio_resid;
else
resid = 0;
tomove = PUFFS_TOMOVE(resid, pmp);
if (tomove != resid) {
error = E2BIG;
goto out;
}
puffs_msgmem_alloc(sizeof(struct puffs_vnmsg_getextattr) + tomove,
&park_getextattr, (void *)&getextattr_msg, 1);
getextattr_msg->pvnr_attrnamespace = attrnamespace;
strlcpy(getextattr_msg->pvnr_attrname, name,
sizeof(getextattr_msg->pvnr_attrname));
puffs_credcvt(&getextattr_msg->pvnr_cred, ap->a_cred);
if (sizep)
getextattr_msg->pvnr_datasize = 1;
getextattr_msg->pvnr_resid = tomove;
puffs_msg_setinfo(park_getextattr,
PUFFSOP_VN, PUFFS_VN_GETEXTATTR, VPTOPNC(vp));
puffs_msg_setdelta(park_getextattr, tomove);
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_getextattr, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
resid = getextattr_msg->pvnr_resid;
if (resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_GETEXTATTR, E2BIG,
"resid grew", VPTOPNC(vp));
error = EPROTO;
goto out;
}
if (sizep)
*sizep = getextattr_msg->pvnr_datasize;
if (uio)
error = uiomove(getextattr_msg->pvnr_data, tomove - resid, uio);
out:
PUFFS_MSG_RELEASE(getextattr);
return error;
}
int
puffs_vnop_setextattr(void *v)
{
struct vop_setextattr_args /* {
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
struct uio *a_uio;
kauth_cred_t a_cred;
}; */ *ap = v;
PUFFS_MSG_VARS(vn, setextattr);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int attrnamespace = ap->a_attrnamespace;
const char *name = ap->a_name;
struct uio *uio = ap->a_uio;
size_t tomove, resid;
int error;
if (uio)
resid = uio->uio_resid;
else
resid = 0;
tomove = PUFFS_TOMOVE(resid, pmp);
if (tomove != resid) {
error = E2BIG;
goto out;
}
puffs_msgmem_alloc(sizeof(struct puffs_vnmsg_setextattr) + tomove,
&park_setextattr, (void *)&setextattr_msg, 1);
setextattr_msg->pvnr_attrnamespace = attrnamespace;
strlcpy(setextattr_msg->pvnr_attrname, name,
sizeof(setextattr_msg->pvnr_attrname));
puffs_credcvt(&setextattr_msg->pvnr_cred, ap->a_cred);
setextattr_msg->pvnr_resid = tomove;
if (uio) {
error = uiomove(setextattr_msg->pvnr_data, tomove, uio);
if (error)
goto out;
}
puffs_msg_setinfo(park_setextattr,
PUFFSOP_VN, PUFFS_VN_SETEXTATTR, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_setextattr, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
if (setextattr_msg->pvnr_resid != 0)
error = EIO;
out:
PUFFS_MSG_RELEASE(setextattr);
return error;
}
int
puffs_vnop_listextattr(void *v)
{
struct vop_listextattr_args /* {
struct vnode *a_vp;
int a_attrnamespace;
struct uio *a_uio;
size_t *a_size;
int a_flag,
kauth_cred_t a_cred;
}; */ *ap = v;
PUFFS_MSG_VARS(vn, listextattr);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int attrnamespace = ap->a_attrnamespace;
struct uio *uio = ap->a_uio;
size_t *sizep = ap->a_size;
int flag = ap->a_flag;
size_t tomove, resid;
int error;
if (uio)
resid = uio->uio_resid;
else
resid = 0;
tomove = PUFFS_TOMOVE(resid, pmp);
if (tomove != resid) {
error = E2BIG;
goto out;
}
puffs_msgmem_alloc(sizeof(struct puffs_vnmsg_listextattr) + tomove,
&park_listextattr, (void *)&listextattr_msg, 1);
listextattr_msg->pvnr_attrnamespace = attrnamespace;
listextattr_msg->pvnr_flag = flag;
puffs_credcvt(&listextattr_msg->pvnr_cred, ap->a_cred);
listextattr_msg->pvnr_resid = tomove;
if (sizep)
listextattr_msg->pvnr_datasize = 1;
puffs_msg_setinfo(park_listextattr,
PUFFSOP_VN, PUFFS_VN_LISTEXTATTR, VPTOPNC(vp));
puffs_msg_setdelta(park_listextattr, tomove);
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_listextattr, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
resid = listextattr_msg->pvnr_resid;
if (resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_LISTEXTATTR, E2BIG,
"resid grew", VPTOPNC(vp));
error = EPROTO;
goto out;
}
if (sizep)
*sizep = listextattr_msg->pvnr_datasize;
if (uio)
error = uiomove(listextattr_msg->pvnr_data, tomove-resid, uio);
out:
PUFFS_MSG_RELEASE(listextattr);
return error;
}
int
puffs_vnop_deleteextattr(void *v)
{
struct vop_deleteextattr_args /* {
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
kauth_cred_t a_cred;
}; */ *ap = v;
PUFFS_MSG_VARS(vn, deleteextattr);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
int attrnamespace = ap->a_attrnamespace;
const char *name = ap->a_name;
int error;
PUFFS_MSG_ALLOC(vn, deleteextattr);
deleteextattr_msg->pvnr_attrnamespace = attrnamespace;
strlcpy(deleteextattr_msg->pvnr_attrname, name,
sizeof(deleteextattr_msg->pvnr_attrname));
puffs_credcvt(&deleteextattr_msg->pvnr_cred, ap->a_cred);
puffs_msg_setinfo(park_deleteextattr,
PUFFSOP_VN, PUFFS_VN_DELETEEXTATTR, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_deleteextattr,
vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
PUFFS_MSG_RELEASE(deleteextattr);
return error;
}
/*
* spec & fifo. These call the miscfs spec and fifo vectors, but issue
* FAF update information for the puffs node first.
*/
int
puffs_vnop_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(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0);
return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v);
}
int
puffs_vnop_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;
} */ *ap = v;
puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0);
return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v);
}
int
puffs_vnop_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(VPTOPP(ap->a_vp), PUFFS_UPDATEATIME, 0);
return VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), v);
}
int
puffs_vnop_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;
} */ *ap = v;
puffs_updatenode(VPTOPP(ap->a_vp), PUFFS_UPDATEMTIME, 0);
return VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), v);
}
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