659 lines
13 KiB
C
659 lines
13 KiB
C
/*-
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed
|
|
* to Berkeley by John Heidemann of the UCLA Ficus project.
|
|
*
|
|
* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
|
|
*
|
|
* 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.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/event.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/poll.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/vnode_pager.h>
|
|
|
|
static int vop_nolookup(struct vop_lookup_args *);
|
|
static int vop_nostrategy(struct vop_strategy_args *);
|
|
|
|
/*
|
|
* This vnode table stores what we want to do if the filesystem doesn't
|
|
* implement a particular VOP.
|
|
*
|
|
* If there is no specific entry here, we will return EOPNOTSUPP.
|
|
*
|
|
*/
|
|
|
|
struct vop_vector default_vnodeops = {
|
|
.vop_default = NULL,
|
|
.vop_bypass = VOP_EOPNOTSUPP,
|
|
|
|
.vop_advlock = VOP_EINVAL,
|
|
.vop_bmap = vop_stdbmap,
|
|
.vop_close = VOP_NULL,
|
|
.vop_fsync = VOP_NULL,
|
|
.vop_getpages = vop_stdgetpages,
|
|
.vop_getwritemount = vop_stdgetwritemount,
|
|
.vop_inactive = VOP_NULL,
|
|
.vop_ioctl = VOP_ENOTTY,
|
|
.vop_kqfilter = vop_stdkqfilter,
|
|
.vop_islocked = vop_stdislocked,
|
|
.vop_lease = VOP_NULL,
|
|
.vop_lock = vop_stdlock,
|
|
.vop_lookup = vop_nolookup,
|
|
.vop_open = VOP_NULL,
|
|
.vop_pathconf = VOP_EINVAL,
|
|
.vop_poll = vop_nopoll,
|
|
.vop_putpages = vop_stdputpages,
|
|
.vop_readlink = VOP_EINVAL,
|
|
.vop_revoke = VOP_PANIC,
|
|
.vop_strategy = vop_nostrategy,
|
|
.vop_unlock = vop_stdunlock,
|
|
};
|
|
|
|
/*
|
|
* Series of placeholder functions for various error returns for
|
|
* VOPs.
|
|
*/
|
|
|
|
int
|
|
vop_eopnotsupp(struct vop_generic_args *ap)
|
|
{
|
|
/*
|
|
printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
|
|
*/
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vop_ebadf(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
int
|
|
vop_enotty(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (ENOTTY);
|
|
}
|
|
|
|
int
|
|
vop_einval(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
|
|
int
|
|
vop_null(struct vop_generic_args *ap)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Helper function to panic on some bad VOPs in some filesystems.
|
|
*/
|
|
int
|
|
vop_panic(struct vop_generic_args *ap)
|
|
{
|
|
|
|
panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
|
|
}
|
|
|
|
/*
|
|
* vop_std<something> and vop_no<something> are default functions for use by
|
|
* filesystems that need the "default reasonable" implementation for a
|
|
* particular operation.
|
|
*
|
|
* The documentation for the operations they implement exists (if it exists)
|
|
* in the VOP_<SOMETHING>(9) manpage (all uppercase).
|
|
*/
|
|
|
|
/*
|
|
* Default vop for filesystems that do not support name lookup
|
|
*/
|
|
static int
|
|
vop_nolookup(ap)
|
|
struct vop_lookup_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
|
|
*ap->a_vpp = NULL;
|
|
return (ENOTDIR);
|
|
}
|
|
|
|
/*
|
|
* vop_nostrategy:
|
|
*
|
|
* Strategy routine for VFS devices that have none.
|
|
*
|
|
* BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
|
|
* routine. Typically this is done for a BIO_READ strategy call.
|
|
* Typically B_INVAL is assumed to already be clear prior to a write
|
|
* and should not be cleared manually unless you just made the buffer
|
|
* invalid. BIO_ERROR should be cleared either way.
|
|
*/
|
|
|
|
static int
|
|
vop_nostrategy (struct vop_strategy_args *ap)
|
|
{
|
|
printf("No strategy for buffer at %p\n", ap->a_bp);
|
|
vprint("vnode", ap->a_vp);
|
|
ap->a_bp->b_ioflags |= BIO_ERROR;
|
|
ap->a_bp->b_error = EOPNOTSUPP;
|
|
bufdone(ap->a_bp);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* vop_stdpathconf:
|
|
*
|
|
* Standard implementation of POSIX pathconf, to get information about limits
|
|
* for a filesystem.
|
|
* Override per filesystem for the case where the filesystem has smaller
|
|
* limits.
|
|
*/
|
|
int
|
|
vop_stdpathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_NAME_MAX:
|
|
*ap->a_retval = NAME_MAX;
|
|
return (0);
|
|
case _PC_PATH_MAX:
|
|
*ap->a_retval = PATH_MAX;
|
|
return (0);
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_MAX_CANON:
|
|
*ap->a_retval = MAX_CANON;
|
|
return (0);
|
|
case _PC_MAX_INPUT:
|
|
*ap->a_retval = MAX_INPUT;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
case _PC_VDISABLE:
|
|
*ap->a_retval = _POSIX_VDISABLE;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Standard lock, unlock and islocked functions.
|
|
*/
|
|
int
|
|
vop_stdlock(ap)
|
|
struct vop_lock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
return (lockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), ap->a_td));
|
|
}
|
|
|
|
/* See above. */
|
|
int
|
|
vop_stdunlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp),
|
|
ap->a_td));
|
|
}
|
|
|
|
/* See above. */
|
|
int
|
|
vop_stdislocked(ap)
|
|
struct vop_islocked_args /* {
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (lockstatus(ap->a_vp->v_vnlock, ap->a_td));
|
|
}
|
|
|
|
/*
|
|
* Return true for select/poll.
|
|
*/
|
|
int
|
|
vop_nopoll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
/*
|
|
* Return true for read/write. If the user asked for something
|
|
* special, return POLLNVAL, so that clients have a way of
|
|
* determining reliably whether or not the extended
|
|
* functionality is present without hard-coding knowledge
|
|
* of specific filesystem implementations.
|
|
* Stay in sync with kern_conf.c::no_poll().
|
|
*/
|
|
if (ap->a_events & ~POLLSTANDARD)
|
|
return (POLLNVAL);
|
|
|
|
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
|
|
}
|
|
|
|
/*
|
|
* Implement poll for local filesystems that support it.
|
|
*/
|
|
int
|
|
vop_stdpoll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
if (ap->a_events & ~POLLSTANDARD)
|
|
return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
|
|
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
|
|
}
|
|
|
|
/*
|
|
* Return our mount point, as we will take charge of the writes.
|
|
*/
|
|
int
|
|
vop_stdgetwritemount(ap)
|
|
struct vop_getwritemount_args /* {
|
|
struct vnode *a_vp;
|
|
struct mount **a_mpp;
|
|
} */ *ap;
|
|
{
|
|
|
|
*(ap->a_mpp) = ap->a_vp->v_mount;
|
|
return (0);
|
|
}
|
|
|
|
/* XXX Needs good comment and VOP_BMAP(9) manpage */
|
|
int
|
|
vop_stdbmap(ap)
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct bufobj **a_bop;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
int *a_runb;
|
|
} */ *ap;
|
|
{
|
|
|
|
if (ap->a_bop != NULL)
|
|
*ap->a_bop = &ap->a_vp->v_bufobj;
|
|
if (ap->a_bnp != NULL)
|
|
*ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
|
|
if (ap->a_runp != NULL)
|
|
*ap->a_runp = 0;
|
|
if (ap->a_runb != NULL)
|
|
*ap->a_runb = 0;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vop_stdfsync(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct buf *bp;
|
|
struct bufobj *bo;
|
|
struct buf *nbp;
|
|
int error = 0;
|
|
int maxretry = 1000; /* large, arbitrarily chosen */
|
|
|
|
VI_LOCK(vp);
|
|
loop1:
|
|
/*
|
|
* MARK/SCAN initialization to avoid infinite loops.
|
|
*/
|
|
TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) {
|
|
bp->b_vflags &= ~BV_SCANNED;
|
|
bp->b_error = 0;
|
|
}
|
|
|
|
/*
|
|
* Flush all dirty buffers associated with a vnode.
|
|
*/
|
|
loop2:
|
|
TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
|
|
if ((bp->b_vflags & BV_SCANNED) != 0)
|
|
continue;
|
|
bp->b_vflags |= BV_SCANNED;
|
|
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
|
|
continue;
|
|
VI_UNLOCK(vp);
|
|
KASSERT(bp->b_bufobj == &vp->v_bufobj,
|
|
("bp %p wrong b_bufobj %p should be %p",
|
|
bp, bp->b_bufobj, &vp->v_bufobj));
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("fsync: not dirty");
|
|
if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
|
|
vfs_bio_awrite(bp);
|
|
} else {
|
|
bremfree(bp);
|
|
bawrite(bp);
|
|
}
|
|
VI_LOCK(vp);
|
|
goto loop2;
|
|
}
|
|
|
|
/*
|
|
* If synchronous the caller expects us to completely resolve all
|
|
* dirty buffers in the system. Wait for in-progress I/O to
|
|
* complete (which could include background bitmap writes), then
|
|
* retry if dirty blocks still exist.
|
|
*/
|
|
if (ap->a_waitfor == MNT_WAIT) {
|
|
bo = &vp->v_bufobj;
|
|
bufobj_wwait(bo, 0, 0);
|
|
if (bo->bo_dirty.bv_cnt > 0) {
|
|
/*
|
|
* If we are unable to write any of these buffers
|
|
* then we fail now rather than trying endlessly
|
|
* to write them out.
|
|
*/
|
|
TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
|
|
if ((error = bp->b_error) == 0)
|
|
continue;
|
|
if (error == 0 && --maxretry >= 0)
|
|
goto loop1;
|
|
error = EAGAIN;
|
|
}
|
|
}
|
|
VI_UNLOCK(vp);
|
|
if (error == EAGAIN)
|
|
vprint("fsync: giving up on dirty", vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
|
|
int
|
|
vop_stdgetpages(ap)
|
|
struct vop_getpages_args /* {
|
|
struct vnode *a_vp;
|
|
vm_page_t *a_m;
|
|
int a_count;
|
|
int a_reqpage;
|
|
vm_ooffset_t a_offset;
|
|
} */ *ap;
|
|
{
|
|
|
|
return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
|
|
ap->a_count, ap->a_reqpage);
|
|
}
|
|
|
|
int
|
|
vop_stdkqfilter(struct vop_kqfilter_args *ap)
|
|
{
|
|
return vfs_kqfilter(ap);
|
|
}
|
|
|
|
/* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
|
|
int
|
|
vop_stdputpages(ap)
|
|
struct vop_putpages_args /* {
|
|
struct vnode *a_vp;
|
|
vm_page_t *a_m;
|
|
int a_count;
|
|
int a_sync;
|
|
int *a_rtvals;
|
|
vm_ooffset_t a_offset;
|
|
} */ *ap;
|
|
{
|
|
|
|
return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
|
|
ap->a_sync, ap->a_rtvals);
|
|
}
|
|
|
|
/*
|
|
* vfs default ops
|
|
* used to fill the vfs function table to get reasonable default return values.
|
|
*/
|
|
int
|
|
vfs_stdroot (mp, flags, vpp, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstatfs (mp, sbp, td)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdvptofh (vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdquotactl (mp, cmds, uid, arg, td)
|
|
struct mount *mp;
|
|
int cmds;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsync(mp, waitfor, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp, *nvp;
|
|
int error, lockreq, allerror = 0;
|
|
|
|
lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
|
|
if (waitfor != MNT_WAIT)
|
|
lockreq |= LK_NOWAIT;
|
|
/*
|
|
* Force stale buffer cache information to be flushed.
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
loop:
|
|
MNT_VNODE_FOREACH(vp, mp, nvp) {
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
|
|
if ((error = vget(vp, lockreq, td)) != 0) {
|
|
MNT_ILOCK(mp);
|
|
if (error == ENOENT)
|
|
goto loop;
|
|
continue;
|
|
}
|
|
error = VOP_FSYNC(vp, waitfor, td);
|
|
if (error)
|
|
allerror = error;
|
|
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(vp);
|
|
MNT_ILOCK(mp);
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
return (allerror);
|
|
}
|
|
|
|
int
|
|
vfs_stdnosync (mp, waitfor, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdvget (mp, ino, flags, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdfhtovp (mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdinit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stduninit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td)
|
|
struct mount *mp;
|
|
int cmd;
|
|
struct vnode *filename_vp;
|
|
int attrnamespace;
|
|
const char *attrname;
|
|
struct thread *td;
|
|
{
|
|
|
|
if (filename_vp != NULL)
|
|
VOP_UNLOCK(filename_vp, 0, td);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsysctl(mp, op, req)
|
|
struct mount *mp;
|
|
fsctlop_t op;
|
|
struct sysctl_req *req;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/* end of vfs default ops */
|