File: [local] / src / sys / kern / vfs_subr.c (download)
Revision 1.58, Thu Mar 22 00:31:56 2001 UTC (23 years, 2 months ago) by art
Branch: MAIN
CVS Tags: OPENBSD_2_9_BASE
Branch point for: OPENBSD_2_9
Changes since 1.57: +7 -3 lines
Use pool for allocating vnodes.
Even though vnodes are never freed (could be) this gives us big memory and
kmem_map savings.
|
/* $OpenBSD: vfs_subr.c,v 1.58 2001/03/22 00:31:56 art Exp $ */
/* $NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*
* @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94
*/
/*
* External virtual filesystem routines
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/time.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#include <sys/namei.h>
#include <sys/ucred.h>
#include <sys/buf.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/syscallargs.h>
#include <sys/pool.h>
#include <vm/vm.h>
#include <sys/sysctl.h>
#include <miscfs/specfs/specdev.h>
#if defined(UVM)
#include <uvm/uvm_extern.h>
#endif
enum vtype iftovt_tab[16] = {
VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
};
int vttoif_tab[9] = {
0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
S_IFSOCK, S_IFIFO, S_IFMT,
};
int doforce = 1; /* 1 => permit forcible unmounting */
int prtactive = 0; /* 1 => print out reclaim of active vnodes */
int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */
/*
* Insq/Remq for the vnode usage lists.
*/
#define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs)
#define bufremvn(bp) { \
LIST_REMOVE(bp, b_vnbufs); \
(bp)->b_vnbufs.le_next = NOLIST; \
}
struct freelst vnode_hold_list; /* list of vnodes referencing buffers */
struct freelst vnode_free_list; /* vnode free list */
struct mntlist mountlist; /* mounted filesystem list */
struct simplelock mountlist_slock;
static struct simplelock mntid_slock;
struct simplelock mntvnode_slock;
struct simplelock vnode_free_list_slock;
struct simplelock spechash_slock;
void vclean __P((struct vnode *, int, struct proc *));
void insmntque __P((struct vnode *, struct mount *));
int getdevvp __P((dev_t, struct vnode **, enum vtype));
int vfs_hang_addrlist __P((struct mount *, struct netexport *,
struct export_args *));
int vfs_free_netcred __P((struct radix_node *, void *));
void vfs_free_addrlist __P((struct netexport *));
static __inline__ void vputonfreelist __P((struct vnode *));
#ifdef DEBUG
void printlockedvnodes __P((void));
#endif
struct pool vnode_pool;
/*
* Initialize the vnode management data structures.
*/
void
vntblinit()
{
pool_init(&vnode_pool, sizeof(struct vnode), 0, 0, 0, "vnodes",
0, pool_page_alloc_nointr, pool_page_free_nointr, M_VNODE);
simple_lock_init(&mntvnode_slock);
simple_lock_init(&mntid_slock);
simple_lock_init(&spechash_slock);
TAILQ_INIT(&vnode_hold_list);
TAILQ_INIT(&vnode_free_list);
simple_lock_init(&vnode_free_list_slock);
CIRCLEQ_INIT(&mountlist);
simple_lock_init(&mountlist_slock);
/*
* Initialize the filesystem syncer.
*/
vn_initialize_syncerd();
}
/*
* Mark a mount point as busy. Used to synchronize access and to delay
* unmounting. Interlock is not released on failure.
*/
int
vfs_busy(mp, flags, interlkp, p)
struct mount *mp;
int flags;
struct simplelock *interlkp;
struct proc *p;
{
int lkflags;
if (mp->mnt_flag & MNT_UNMOUNT) {
if (flags & LK_NOWAIT)
return (ENOENT);
mp->mnt_flag |= MNT_MWAIT;
if (interlkp)
simple_unlock(interlkp);
/*
* Since all busy locks are shared except the exclusive
* lock granted when unmounting, the only place that a
* wakeup needs to be done is at the release of the
* exclusive lock at the end of dounmount.
*/
sleep((caddr_t)mp, PVFS);
if (interlkp)
simple_lock(interlkp);
return (ENOENT);
}
lkflags = LK_SHARED;
if (interlkp)
lkflags |= LK_INTERLOCK;
if (lockmgr(&mp->mnt_lock, lkflags, interlkp, p))
panic("vfs_busy: unexpected lock failure");
return (0);
}
/*
* Free a busy file system
*/
void
vfs_unbusy(mp, p)
struct mount *mp;
struct proc *p;
{
lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, p);
}
/*
* Lookup a filesystem type, and if found allocate and initialize
* a mount structure for it.
*
* Devname is usually updated by mount(8) after booting.
*/
int
vfs_rootmountalloc(fstypename, devname, mpp)
char *fstypename;
char *devname;
struct mount **mpp;
{
struct proc *p = curproc; /* XXX */
struct vfsconf *vfsp;
struct mount *mp;
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (!strcmp(vfsp->vfc_name, fstypename))
break;
if (vfsp == NULL)
return (ENODEV);
mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
bzero((char *)mp, (u_long)sizeof(struct mount));
lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
(void)vfs_busy(mp, LK_NOWAIT, 0, p);
LIST_INIT(&mp->mnt_vnodelist);
mp->mnt_vfc = vfsp;
mp->mnt_op = vfsp->vfc_vfsops;
mp->mnt_flag = MNT_RDONLY;
mp->mnt_vnodecovered = NULLVP;
vfsp->vfc_refcount++;
mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
mp->mnt_stat.f_mntonname[0] = '/';
(void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0);
*mpp = mp;
return (0);
}
/*
* Find an appropriate filesystem to use for the root. If a filesystem
* has not been preselected, walk through the list of known filesystems
* trying those that have mountroot routines, and try them until one
* works or we have tried them all.
*/
int
vfs_mountroot()
{
struct vfsconf *vfsp;
extern int (*mountroot)(void);
int error;
if (mountroot != NULL)
return ((*mountroot)());
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
if (vfsp->vfc_mountroot == NULL)
continue;
if ((error = (*vfsp->vfc_mountroot)()) == 0)
return (0);
printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error);
}
return (ENODEV);
}
/*
* Lookup a mount point by filesystem identifier.
*/
struct mount *
vfs_getvfs(fsid)
fsid_t *fsid;
{
register struct mount *mp;
simple_lock(&mountlist_slock);
CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) {
if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) {
simple_unlock(&mountlist_slock);
return (mp);
}
}
simple_unlock(&mountlist_slock);
return ((struct mount *)0);
}
/*
* Get a new unique fsid
*/
void
vfs_getnewfsid(mp)
struct mount *mp;
{
static u_short xxxfs_mntid;
fsid_t tfsid;
int mtype;
simple_lock(&mntid_slock);
mtype = mp->mnt_vfc->vfc_typenum;
mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0);
mp->mnt_stat.f_fsid.val[1] = mtype;
if (xxxfs_mntid == 0)
++xxxfs_mntid;
tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid);
tfsid.val[1] = mtype;
if (!CIRCLEQ_EMPTY(&mountlist)) {
while (vfs_getvfs(&tfsid)) {
tfsid.val[0]++;
xxxfs_mntid++;
}
}
mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
simple_unlock(&mntid_slock);
}
/*
* Make a 'unique' number from a mount type name.
* Note that this is no longer used for ffs which
* now has an on-disk filesystem id.
*/
long
makefstype(type)
char *type;
{
long rv;
for (rv = 0; *type; type++) {
rv <<= 2;
rv ^= *type;
}
return rv;
}
/*
* Set vnode attributes to VNOVAL
*/
void
vattr_null(vap)
register struct vattr *vap;
{
vap->va_type = VNON;
/* XXX These next two used to be one line, but for a GCC bug. */
vap->va_size = VNOVAL;
vap->va_bytes = VNOVAL;
vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid =
vap->va_fsid = vap->va_fileid =
vap->va_blocksize = vap->va_rdev =
vap->va_atime.tv_sec = vap->va_atime.tv_nsec =
vap->va_mtime.tv_sec = vap->va_mtime.tv_nsec =
vap->va_ctime.tv_sec = vap->va_ctime.tv_nsec =
vap->va_flags = vap->va_gen = VNOVAL;
vap->va_vaflags = 0;
}
/*
* Routines having to do with the management of the vnode table.
*/
extern int (**dead_vnodeop_p) __P((void *));
long numvnodes;
/*
* Return the next vnode from the free list.
*/
int
getnewvnode(tag, mp, vops, vpp)
enum vtagtype tag;
struct mount *mp;
int (**vops) __P((void *));
struct vnode **vpp;
{
struct proc *p = curproc; /* XXX */
struct freelst *listhd;
static int toggle;
struct vnode *vp;
int s;
/*
* We must choose whether to allocate a new vnode or recycle an
* existing one. The criterion for allocating a new one is that
* the total number of vnodes is less than the number desired or
* there are no vnodes on either free list. Generally we only
* want to recycle vnodes that have no buffers associated with
* them, so we look first on the vnode_free_list. If it is empty,
* we next consider vnodes with referencing buffers on the
* vnode_hold_list. The toggle ensures that half the time we
* will use a buffer from the vnode_hold_list, and half the time
* we will allocate a new one unless the list has grown to twice
* the desired size. We are reticent to recycle vnodes from the
* vnode_hold_list because we will lose the identity of all its
* referencing buffers.
*/
toggle ^= 1;
if (numvnodes > 2 * desiredvnodes)
toggle = 0;
simple_lock(&vnode_free_list_slock);
s = splbio();
if ((numvnodes < desiredvnodes) ||
((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) &&
((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) {
splx(s);
simple_unlock(&vnode_free_list_slock);
vp = pool_get(&vnode_pool, PR_WAITOK);
bzero((char *)vp, sizeof *vp);
numvnodes++;
} else {
for (vp = TAILQ_FIRST(listhd); vp != NULLVP;
vp = TAILQ_NEXT(vp, v_freelist)) {
if (simple_lock_try(&vp->v_interlock))
break;
}
/*
* Unless this is a bad time of the month, at most
* the first NCPUS items on the free list are
* locked, so this is close enough to being empty.
*/
if (vp == NULLVP) {
splx(s);
simple_unlock(&vnode_free_list_slock);
tablefull("vnode");
*vpp = 0;
return (ENFILE);
}
if (vp->v_usecount) {
vprint("free vnode", vp);
panic("free vnode isn't");
}
TAILQ_REMOVE(listhd, vp, v_freelist);
vp->v_bioflag &= ~VBIOONFREELIST;
splx(s);
simple_unlock(&vnode_free_list_slock);
if (vp->v_type != VBAD)
vgonel(vp, p);
else
simple_unlock(&vp->v_interlock);
#ifdef DIAGNOSTIC
if (vp->v_data) {
vprint("cleaned vnode", vp);
panic("cleaned vnode isn't");
}
s = splbio();
if (vp->v_numoutput)
panic("Clean vnode has pending I/O's");
splx(s);
#endif
vp->v_flag = 0;
vp->v_bioflag = 0;
vp->v_socket = 0;
}
vp->v_type = VNON;
cache_purge(vp);
vp->v_tag = tag;
vp->v_op = vops;
insmntque(vp, mp);
*vpp = vp;
vp->v_usecount = 1;
vp->v_data = 0;
#ifdef UVM
simple_lock_init(&vp->v_uvm.u_obj.vmobjlock);
#endif
return (0);
}
/*
* Move a vnode from one mount queue to another.
*/
void
insmntque(vp, mp)
register struct vnode *vp;
register struct mount *mp;
{
simple_lock(&mntvnode_slock);
/*
* Delete from old mount point vnode list, if on one.
*/
if (vp->v_mount != NULL)
LIST_REMOVE(vp, v_mntvnodes);
/*
* Insert into list of vnodes for the new mount point, if available.
*/
if ((vp->v_mount = mp) != NULL)
LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
simple_unlock(&mntvnode_slock);
}
/*
* Create a vnode for a block device.
* Used for root filesystem, argdev, and swap areas.
* Also used for memory file system special devices.
*/
int
bdevvp(dev, vpp)
dev_t dev;
struct vnode **vpp;
{
return (getdevvp(dev, vpp, VBLK));
}
/*
* Create a vnode for a character device.
* Used for kernfs and some console handling.
*/
int
cdevvp(dev, vpp)
dev_t dev;
struct vnode **vpp;
{
return (getdevvp(dev, vpp, VCHR));
}
/*
* Create a vnode for a device.
* Used by bdevvp (block device) for root file system etc.,
* and by cdevvp (character device) for console and kernfs.
*/
int
getdevvp(dev, vpp, type)
dev_t dev;
struct vnode **vpp;
enum vtype type;
{
register struct vnode *vp;
struct vnode *nvp;
int error;
if (dev == NODEV) {
*vpp = NULLVP;
return (0);
}
error = getnewvnode(VT_NON, NULL, spec_vnodeop_p, &nvp);
if (error) {
*vpp = NULLVP;
return (error);
}
vp = nvp;
vp->v_type = type;
if ((nvp = checkalias(vp, dev, NULL)) != 0) {
vput(vp);
vp = nvp;
}
*vpp = vp;
return (0);
}
/*
* Check to see if the new vnode represents a special device
* for which we already have a vnode (either because of
* bdevvp() or because of a different vnode representing
* the same block device). If such an alias exists, deallocate
* the existing contents and return the aliased vnode. The
* caller is responsible for filling it with its new contents.
*/
struct vnode *
checkalias(nvp, nvp_rdev, mp)
register struct vnode *nvp;
dev_t nvp_rdev;
struct mount *mp;
{
struct proc *p = curproc;
register struct vnode *vp;
struct vnode **vpp;
if (nvp->v_type != VBLK && nvp->v_type != VCHR)
return (NULLVP);
vpp = &speclisth[SPECHASH(nvp_rdev)];
loop:
simple_lock(&spechash_slock);
for (vp = *vpp; vp; vp = vp->v_specnext) {
simple_lock(&vp->v_interlock);
if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) {
simple_unlock(&vp->v_interlock);
continue;
}
/*
* Alias, but not in use, so flush it out.
*/
if (vp->v_usecount == 0) {
simple_unlock(&spechash_slock);
vgonel(vp, p);
goto loop;
}
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) {
simple_unlock(&spechash_slock);
goto loop;
}
break;
}
/*
* Common case is actually in the if statement
*/
if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) {
MALLOC(nvp->v_specinfo, struct specinfo *,
sizeof(struct specinfo), M_VNODE, M_WAITOK);
nvp->v_rdev = nvp_rdev;
nvp->v_hashchain = vpp;
nvp->v_specnext = *vpp;
nvp->v_specmountpoint = NULL;
nvp->v_speclockf = NULL;
simple_unlock(&spechash_slock);
*vpp = nvp;
if (vp != NULLVP) {
nvp->v_flag |= VALIASED;
vp->v_flag |= VALIASED;
vput(vp);
}
return (NULLVP);
}
/*
* This code is the uncommon case. It is called in case
* we found an alias that was VT_NON && vtype of VBLK
* This means we found a block device that was created
* using bdevvp.
* An example of such a vnode is the root partition device vnode
* craeted in ffs_mountroot.
*
* The vnodes created by bdevvp should not be aliased (why?).
*/
simple_unlock(&spechash_slock);
VOP_UNLOCK(vp, 0, p);
simple_lock(&vp->v_interlock);
vclean(vp, 0, p);
vp->v_op = nvp->v_op;
vp->v_tag = nvp->v_tag;
nvp->v_type = VNON;
insmntque(vp, mp);
return (vp);
}
/*
* Grab a particular vnode from the free list, increment its
* reference count and lock it. The vnode lock bit is set the
* vnode is being eliminated in vgone. The process is awakened
* when the transition is completed, and an error returned to
* indicate that the vnode is no longer usable (possibly having
* been changed to a new file system type).
*/
int
vget(vp, flags, p)
struct vnode *vp;
int flags;
struct proc *p;
{
int error;
int s;
/*
* If the vnode is in the process of being cleaned out for
* another use, we wait for the cleaning to finish and then
* return failure. Cleaning is determined by checking that
* the VXLOCK flag is set.
*/
if ((flags & LK_INTERLOCK) == 0) {
simple_lock(&vp->v_interlock);
flags |= LK_INTERLOCK;
}
if (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
simple_unlock(&vp->v_interlock);
tsleep((caddr_t)vp, PINOD, "vget", 0);
return (ENOENT);
}
if (vp->v_usecount == 0 &&
(vp->v_bioflag & VBIOONFREELIST)) {
s = splbio();
simple_lock(&vnode_free_list_slock);
if (vp->v_holdcnt > 0)
TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
else
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
simple_unlock(&vnode_free_list_slock);
vp->v_bioflag &= ~VBIOONFREELIST;
splx(s);
}
vp->v_usecount++;
if (flags & LK_TYPE_MASK) {
if ((error = vn_lock(vp, flags, p)) != 0) {
vp->v_usecount--;
if (vp->v_usecount == 0)
vputonfreelist(vp);
simple_unlock(&vp->v_interlock);
}
return (error);
}
simple_unlock(&vp->v_interlock);
return (0);
}
#ifdef DIAGNOSTIC
/*
* Vnode reference.
*/
void
vref(vp)
struct vnode *vp;
{
simple_lock(&vp->v_interlock);
if (vp->v_usecount == 0)
panic("vref used where vget required");
vp->v_usecount++;
simple_unlock(&vp->v_interlock);
}
#endif /* DIAGNOSTIC */
/*
* Must be called at splbio
*/
static __inline__ void
vputonfreelist(vp)
struct vnode *vp;
{
int s;
struct freelst *lst;
s = splbio();
#ifdef DIAGNOSTIC
if (vp->v_usecount != 0)
panic("Use count is not zero!");
if (vp->v_bioflag & VBIOONFREELIST) {
vprint ("vnode already on free list: ", vp);
panic ("vnode already on free list");
}
#endif
vp->v_bioflag |= VBIOONFREELIST;
if (vp->v_holdcnt > 0)
lst = &vnode_hold_list;
else
lst = &vnode_free_list;
if (vp->v_type == VBAD)
TAILQ_INSERT_HEAD(lst, vp, v_freelist);
else
TAILQ_INSERT_TAIL(lst, vp, v_freelist);
splx(s);
}
/*
* vput(), just unlock and vrele()
*/
void
vput(vp)
register struct vnode *vp;
{
struct proc *p = curproc; /* XXX */
#ifdef DIAGNOSTIC
if (vp == NULL)
panic("vput: null vp");
#endif
simple_lock(&vp->v_interlock);
#ifdef DIAGNOSTIC
if (vp->v_usecount == 0) {
vprint("vrele: bad ref count", vp);
panic("vrele: ref cnt");
}
#endif
vp->v_usecount--;
if (vp->v_usecount > 0) {
simple_unlock(&vp->v_interlock);
VOP_UNLOCK(vp, 0, p);
return;
}
#ifdef DIAGNOSTIC
if (vp->v_writecount != 0) {
vprint("vrele: bad writecount", vp);
panic("vrele: v_writecount != 0");
}
#endif
vputonfreelist(vp);
simple_unlock(&vp->v_interlock);
VOP_INACTIVE(vp, p);
}
/*
* Vnode release - use for active VNODES.
* If count drops to zero, call inactive routine and return to freelist.
*/
void
vrele(vp)
register struct vnode *vp;
{
struct proc *p = curproc; /* XXX */
#ifdef DIAGNOSTIC
if (vp == NULL)
panic("vrele: null vp");
#endif
simple_lock(&vp->v_interlock);
#ifdef DIAGNOSTIC
if (vp->v_usecount == 0) {
vprint("vrele: bad ref count", vp);
panic("vrele: ref cnt");
}
#endif
vp->v_usecount--;
if (vp->v_usecount > 0) {
simple_unlock(&vp->v_interlock);
return;
}
#ifdef DIAGNOSTIC
if (vp->v_writecount != 0) {
vprint("vrele: bad writecount", vp);
panic("vrele: v_writecount != 0");
}
#endif
vputonfreelist(vp);
if (vn_lock(vp, LK_EXCLUSIVE|LK_INTERLOCK, p) == 0)
VOP_INACTIVE(vp, p);
}
void vhold __P((struct vnode *vp));
/*
* Page or buffer structure gets a reference.
*/
void
vhold(vp)
register struct vnode *vp;
{
/*
* If it is on the freelist and the hold count is currently
* zero, move it to the hold list.
*/
simple_lock(&vp->v_interlock);
if ((vp->v_bioflag & VBIOONFREELIST) &&
vp->v_holdcnt == 0 && vp->v_usecount == 0) {
simple_lock(&vnode_free_list_slock);
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist);
simple_unlock(&vnode_free_list_slock);
}
vp->v_holdcnt++;
simple_unlock(&vp->v_interlock);
}
/*
* Remove any vnodes in the vnode table belonging to mount point mp.
*
* If MNT_NOFORCE is specified, there should not be any active ones,
* return error if any are found (nb: this is a user error, not a
* system error). If MNT_FORCE is specified, detach any active vnodes
* that are found.
*/
#ifdef DEBUG
int busyprt = 0; /* print out busy vnodes */
struct ctldebug debug1 = { "busyprt", &busyprt };
#endif
int
vflush(mp, skipvp, flags)
struct mount *mp;
struct vnode *skipvp;
int flags;
{
struct proc *p = curproc;
register struct vnode *vp, *nvp;
int busy = 0;
simple_lock(&mntvnode_slock);
loop:
for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) {
if (vp->v_mount != mp)
goto loop;
nvp = vp->v_mntvnodes.le_next;
/*
* Skip over a selected vnode.
*/
if (vp == skipvp)
continue;
simple_lock(&vp->v_interlock);
/*
* Skip over a vnodes marked VSYSTEM.
*/
if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) {
simple_unlock(&vp->v_interlock);
continue;
}
/*
* If WRITECLOSE is set, only flush out regular file
* vnodes open for writing.
*/
if ((flags & WRITECLOSE) &&
(vp->v_writecount == 0 || vp->v_type != VREG)) {
simple_unlock(&vp->v_interlock);
continue;
}
/*
* With v_usecount == 0, all we need to do is clear
* out the vnode data structures and we are done.
*/
if (vp->v_usecount == 0) {
simple_unlock(&mntvnode_slock);
vgonel(vp, p);
simple_lock(&mntvnode_slock);
continue;
}
/*
* If FORCECLOSE is set, forcibly close the vnode.
* For block or character devices, revert to an
* anonymous device. For all other files, just kill them.
*/
if (flags & FORCECLOSE) {
simple_unlock(&mntvnode_slock);
if (vp->v_type != VBLK && vp->v_type != VCHR) {
vgonel(vp, p);
} else {
vclean(vp, 0, p);
vp->v_op = spec_vnodeop_p;
insmntque(vp, (struct mount *)0);
}
simple_lock(&mntvnode_slock);
continue;
}
#ifdef DEBUG
if (busyprt)
vprint("vflush: busy vnode", vp);
#endif
simple_unlock(&vp->v_interlock);
busy++;
}
simple_unlock(&mntvnode_slock);
if (busy)
return (EBUSY);
return (0);
}
/*
* Disassociate the underlying file system from a vnode.
* The vnode interlock is held on entry.
*/
void
vclean(vp, flags, p)
register struct vnode *vp;
int flags;
struct proc *p;
{
int active;
/*
* Check to see if the vnode is in use.
* If so we have to reference it before we clean it out
* so that its count cannot fall to zero and generate a
* race against ourselves to recycle it.
*/
if ((active = vp->v_usecount) != 0)
vp->v_usecount++;
/*
* Prevent the vnode from being recycled or
* brought into use while we clean it out.
*/
if (vp->v_flag & VXLOCK)
panic("vclean: deadlock");
vp->v_flag |= VXLOCK;
/*
* Even if the count is zero, the VOP_INACTIVE routine may still
* have the object locked while it cleans it out. The VOP_LOCK
* ensures that the VOP_INACTIVE routine is done with its work.
* For active vnodes, it ensures that no other activity can
* occur while the underlying object is being cleaned out.
*/
VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, p);
#ifdef UVM
/*
* clean out any VM data associated with the vnode.
*/
uvm_vnp_terminate(vp);
#endif
/*
* Clean out any buffers associated with the vnode.
*/
if (flags & DOCLOSE)
vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0);
/*
* If purging an active vnode, it must be closed and
* deactivated before being reclaimed. Note that the
* VOP_INACTIVE will unlock the vnode
*/
if (active) {
if (flags & DOCLOSE)
VOP_CLOSE(vp, FNONBLOCK, NOCRED, p);
VOP_INACTIVE(vp, p);
} else {
/*
* Any other processes trying to obtain this lock must first
* wait for VXLOCK to clear, then call the new lock operation.
*/
VOP_UNLOCK(vp, 0, p);
}
/*
* Reclaim the vnode.
*/
if (VOP_RECLAIM(vp, p))
panic("vclean: cannot reclaim");
if (active) {
simple_lock(&vp->v_interlock);
vp->v_usecount--;
if (vp->v_usecount == 0) {
if (vp->v_holdcnt > 0)
panic("vclean: not clean");
vputonfreelist(vp);
}
simple_unlock(&vp->v_interlock);
}
cache_purge(vp);
if (vp->v_vnlock) {
if ((vp->v_vnlock->lk_flags & LK_DRAINED) == 0)
vprint("vclean: lock not drained", vp);
FREE(vp->v_vnlock, M_VNODE);
vp->v_vnlock = NULL;
}
/*
* Done with purge, notify sleepers of the grim news.
*/
vp->v_op = dead_vnodeop_p;
vp->v_tag = VT_NON;
vp->v_flag &= ~VXLOCK;
#ifdef DIAGNOSTIC
vp->v_flag &= ~VLOCKSWORK;
#endif
if (vp->v_flag & VXWANT) {
vp->v_flag &= ~VXWANT;
wakeup((caddr_t)vp);
}
}
/*
* Recycle an unused vnode to the front of the free list.
* Release the passed interlock if the vnode will be recycled.
*/
int
vrecycle(vp, inter_lkp, p)
struct vnode *vp;
struct simplelock *inter_lkp;
struct proc *p;
{
simple_lock(&vp->v_interlock);
if (vp->v_usecount == 0) {
if (inter_lkp)
simple_unlock(inter_lkp);
vgonel(vp, p);
return (1);
}
simple_unlock(&vp->v_interlock);
return (0);
}
/*
* Eliminate all activity associated with a vnode
* in preparation for reuse.
*/
void
vgone(vp)
register struct vnode *vp;
{
struct proc *p = curproc;
simple_lock (&vp->v_interlock);
vgonel(vp, p);
}
/*
* vgone, with the vp interlock held.
*/
void
vgonel(vp, p)
struct vnode *vp;
struct proc *p;
{
register struct vnode *vq;
struct vnode *vx;
/*
* If a vgone (or vclean) is already in progress,
* wait until it is done and return.
*/
if (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
simple_unlock(&vp->v_interlock);
tsleep((caddr_t)vp, PINOD, "vgone", 0);
return;
}
/*
* Clean out the filesystem specific data.
*/
vclean(vp, DOCLOSE, p);
/*
* Delete from old mount point vnode list, if on one.
*/
if (vp->v_mount != NULL)
insmntque(vp, (struct mount *)0);
/*
* If special device, remove it from special device alias list
* if it is on one.
*/
if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) {
simple_lock(&spechash_slock);
if (*vp->v_hashchain == vp) {
*vp->v_hashchain = vp->v_specnext;
} else {
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_specnext != vp)
continue;
vq->v_specnext = vp->v_specnext;
break;
}
if (vq == NULL)
panic("missing bdev");
}
if (vp->v_flag & VALIASED) {
vx = NULL;
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type)
continue;
if (vx)
break;
vx = vq;
}
if (vx == NULL)
panic("missing alias");
if (vq == NULL)
vx->v_flag &= ~VALIASED;
vp->v_flag &= ~VALIASED;
}
simple_unlock(&spechash_slock);
FREE(vp->v_specinfo, M_VNODE);
vp->v_specinfo = NULL;
}
/*
* If it is on the freelist and not already at the head,
* move it to the head of the list.
*/
vp->v_type = VBAD;
/*
* Move onto the free list, unless we were called from
* getnewvnode and we're not on any free list
*/
if (vp->v_usecount == 0 &&
(vp->v_bioflag & VBIOONFREELIST)) {
int s;
simple_lock(&vnode_free_list_slock);
s = splbio();
if (vp->v_holdcnt > 0)
panic("vgonel: not clean");
if (TAILQ_FIRST(&vnode_free_list) != vp) {
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
}
splx(s);
simple_unlock(&vnode_free_list_slock);
}
}
/*
* Lookup a vnode by device number.
*/
int
vfinddev(dev, type, vpp)
dev_t dev;
enum vtype type;
struct vnode **vpp;
{
register struct vnode *vp;
int rc =0;
simple_lock(&spechash_slock);
for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
if (dev != vp->v_rdev || type != vp->v_type)
continue;
*vpp = vp;
rc = 1;
break;
}
simple_unlock(&spechash_slock);
return (rc);
}
/*
* Revoke all the vnodes corresponding to the specified minor number
* range (endpoints inclusive) of the specified major.
*/
void
vdevgone(maj, minl, minh, type)
int maj, minl, minh;
enum vtype type;
{
struct vnode *vp;
int mn;
for (mn = minl; mn <= minh; mn++)
if (vfinddev(makedev(maj, mn), type, &vp))
VOP_REVOKE(vp, REVOKEALL);
}
/*
* Calculate the total number of references to a special device.
*/
int
vcount(vp)
struct vnode *vp;
{
struct vnode *vq, *vnext;
int count;
loop:
if ((vp->v_flag & VALIASED) == 0)
return (vp->v_usecount);
simple_lock(&spechash_slock);
for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) {
vnext = vq->v_specnext;
if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type)
continue;
/*
* Alias, but not in use, so flush it out.
*/
if (vq->v_usecount == 0 && vq != vp) {
simple_unlock(&spechash_slock);
vgone(vq);
goto loop;
}
count += vq->v_usecount;
}
simple_unlock(&spechash_slock);
return (count);
}
/*
* Print out a description of a vnode.
*/
static char *typename[] =
{ "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
void
vprint(label, vp)
char *label;
register struct vnode *vp;
{
char buf[64];
if (label != NULL)
printf("%s: ", label);
printf("type %s, usecount %u, writecount %u, holdcount %u,",
typename[vp->v_type], vp->v_usecount, vp->v_writecount,
vp->v_holdcnt);
buf[0] = '\0';
if (vp->v_flag & VROOT)
strcat(buf, "|VROOT");
if (vp->v_flag & VTEXT)
strcat(buf, "|VTEXT");
if (vp->v_flag & VSYSTEM)
strcat(buf, "|VSYSTEM");
if (vp->v_flag & VXLOCK)
strcat(buf, "|VXLOCK");
if (vp->v_flag & VXWANT)
strcat(buf, "|VXWANT");
if (vp->v_bioflag & VBIOWAIT)
strcat(buf, "| VBIOWAIT");
if (vp->v_flag & VALIASED)
strcat(buf, "|VALIASED");
if (buf[0] != '\0')
printf(" flags (%s)", &buf[1]);
if (vp->v_data == NULL) {
printf("\n");
} else {
printf("\n\t");
VOP_PRINT(vp);
}
}
#ifdef DEBUG
/*
* List all of the locked vnodes in the system.
* Called when debugging the kernel.
*/
void
printlockedvnodes()
{
struct proc *p = curproc;
register struct mount *mp, *nmp;
register struct vnode *vp;
printf("Locked vnodes\n");
simple_lock(&mountlist_slock);
for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
nmp = CIRCLEQ_NEXT(mp, mnt_list);
continue;
}
for (vp = mp->mnt_vnodelist.lh_first;
vp != NULL;
vp = vp->v_mntvnodes.le_next) {
if (VOP_ISLOCKED(vp))
vprint((char *)0, vp);
}
simple_lock(&mountlist_slock);
nmp = CIRCLEQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, p);
}
simple_unlock(&mountlist_slock);
}
#endif
/*
* Top level filesystem related information gathering.
*/
int
vfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
struct vfsconf *vfsp;
/* all sysctl names at this level are at least name and field */
if (namelen < 2)
return (ENOTDIR); /* overloaded */
if (name[0] != VFS_GENERIC) {
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (vfsp->vfc_typenum == name[0])
break;
if (vfsp == NULL)
return (EOPNOTSUPP);
return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
oldp, oldlenp, newp, newlen, p));
}
switch (name[1]) {
case VFS_MAXTYPENUM:
return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
case VFS_CONF:
if (namelen < 3)
return (ENOTDIR); /* overloaded */
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (vfsp->vfc_typenum == name[2])
break;
if (vfsp == NULL)
return (EOPNOTSUPP);
return (sysctl_rdstruct(oldp, oldlenp, newp, vfsp,
sizeof(struct vfsconf)));
}
return (EOPNOTSUPP);
}
int kinfo_vdebug = 1;
int kinfo_vgetfailed;
#define KINFO_VNODESLOP 10
/*
* Dump vnode list (via sysctl).
* Copyout address of vnode followed by vnode.
*/
/* ARGSUSED */
int
sysctl_vnode(where, sizep, p)
char *where;
size_t *sizep;
struct proc *p;
{
register struct mount *mp, *nmp;
struct vnode *vp, *nvp;
register char *bp = where, *savebp;
char *ewhere;
int error;
#define VPTRSZ sizeof (struct vnode *)
#define VNODESZ sizeof (struct vnode)
if (where == NULL) {
*sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ);
return (0);
}
ewhere = where + *sizep;
simple_lock(&mountlist_slock);
for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
mp = nmp) {
if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
nmp = CIRCLEQ_NEXT(mp, mnt_list);
continue;
}
savebp = bp;
again:
for (vp = mp->mnt_vnodelist.lh_first;
vp != NULL;
vp = nvp) {
/*
* Check that the vp is still associated with
* this filesystem. RACE: could have been
* recycled onto the same filesystem.
*/
if (vp->v_mount != mp) {
simple_unlock(&mntvnode_slock);
if (kinfo_vdebug)
printf("kinfo: vp changed\n");
bp = savebp;
goto again;
}
nvp = vp->v_mntvnodes.le_next;
if (bp + VPTRSZ + VNODESZ > ewhere) {
simple_unlock(&mntvnode_slock);
*sizep = bp - where;
return (ENOMEM);
}
if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) ||
(error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ)))
return (error);
bp += VPTRSZ + VNODESZ;
simple_lock(&mntvnode_slock);
}
simple_unlock(&mntvnode_slock);
simple_lock(&mountlist_slock);
nmp = CIRCLEQ_NEXT(mp, mnt_list);
vfs_unbusy(mp, p);
}
simple_unlock(&mountlist_slock);
*sizep = bp - where;
return (0);
}
/*
* Check to see if a filesystem is mounted on a block device.
*/
int
vfs_mountedon(vp)
register struct vnode *vp;
{
register struct vnode *vq;
int error = 0;
if (vp->v_specmountpoint != NULL)
return (EBUSY);
if (vp->v_flag & VALIASED) {
simple_lock(&spechash_slock);
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type)
continue;
if (vq->v_specmountpoint != NULL) {
error = EBUSY;
break;
}
}
simple_unlock(&spechash_slock);
}
return (error);
}
/*
* Build hash lists of net addresses and hang them off the mount point.
* Called by ufs_mount() to set up the lists of export addresses.
*/
int
vfs_hang_addrlist(mp, nep, argp)
struct mount *mp;
struct netexport *nep;
struct export_args *argp;
{
register struct netcred *np;
register struct radix_node_head *rnh;
register int i;
struct radix_node *rn;
struct sockaddr *saddr, *smask = 0;
struct domain *dom;
int error;
if (argp->ex_addrlen == 0) {
if (mp->mnt_flag & MNT_DEFEXPORTED)
return (EPERM);
np = &nep->ne_defexported;
np->netc_exflags = argp->ex_flags;
np->netc_anon = argp->ex_anon;
np->netc_anon.cr_ref = 1;
mp->mnt_flag |= MNT_DEFEXPORTED;
return (0);
}
i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
np = (struct netcred *)malloc(i, M_NETADDR, M_WAITOK);
bzero((caddr_t)np, i);
saddr = (struct sockaddr *)(np + 1);
error = copyin(argp->ex_addr, (caddr_t)saddr, argp->ex_addrlen);
if (error)
goto out;
if (saddr->sa_len > argp->ex_addrlen)
saddr->sa_len = argp->ex_addrlen;
if (argp->ex_masklen) {
smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen);
if (error)
goto out;
if (smask->sa_len > argp->ex_masklen)
smask->sa_len = argp->ex_masklen;
}
i = saddr->sa_family;
if ((rnh = nep->ne_rtable[i]) == 0) {
/*
* Seems silly to initialize every AF when most are not
* used, do so on demand here
*/
for (dom = domains; dom; dom = dom->dom_next)
if (dom->dom_family == i && dom->dom_rtattach) {
dom->dom_rtattach((void **)&nep->ne_rtable[i],
dom->dom_rtoffset);
break;
}
if ((rnh = nep->ne_rtable[i]) == 0) {
error = ENOBUFS;
goto out;
}
}
rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh,
np->netc_rnodes);
if (rn == 0 || np != (struct netcred *)rn) { /* already exists */
error = EPERM;
goto out;
}
np->netc_exflags = argp->ex_flags;
np->netc_anon = argp->ex_anon;
np->netc_anon.cr_ref = 1;
return (0);
out:
free(np, M_NETADDR);
return (error);
}
/* ARGSUSED */
int
vfs_free_netcred(rn, w)
struct radix_node *rn;
void *w;
{
register struct radix_node_head *rnh = (struct radix_node_head *)w;
(*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh);
free((caddr_t)rn, M_NETADDR);
return (0);
}
/*
* Free the net address hash lists that are hanging off the mount points.
*/
void
vfs_free_addrlist(nep)
struct netexport *nep;
{
register int i;
register struct radix_node_head *rnh;
for (i = 0; i <= AF_MAX; i++)
if ((rnh = nep->ne_rtable[i]) != NULL) {
(*rnh->rnh_walktree)(rnh, vfs_free_netcred, rnh);
free((caddr_t)rnh, M_RTABLE);
nep->ne_rtable[i] = 0;
}
}
int
vfs_export(mp, nep, argp)
struct mount *mp;
struct netexport *nep;
struct export_args *argp;
{
int error;
if (argp->ex_flags & MNT_DELEXPORT) {
vfs_free_addrlist(nep);
mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
}
if (argp->ex_flags & MNT_EXPORTED) {
if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0)
return (error);
mp->mnt_flag |= MNT_EXPORTED;
}
return (0);
}
struct netcred *
vfs_export_lookup(mp, nep, nam)
register struct mount *mp;
struct netexport *nep;
struct mbuf *nam;
{
register struct netcred *np;
register struct radix_node_head *rnh;
struct sockaddr *saddr;
np = NULL;
if (mp->mnt_flag & MNT_EXPORTED) {
/*
* Lookup in the export list first.
*/
if (nam != NULL) {
saddr = mtod(nam, struct sockaddr *);
rnh = nep->ne_rtable[saddr->sa_family];
if (rnh != NULL) {
np = (struct netcred *)
(*rnh->rnh_matchaddr)((caddr_t)saddr,
rnh);
if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
np = NULL;
}
}
/*
* If no address match, use the default if it exists.
*/
if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
np = &nep->ne_defexported;
}
return (np);
}
/*
* Do the usual access checking.
* file_mode, uid and gid are from the vnode in question,
* while acc_mode and cred are from the VOP_ACCESS parameter list
*/
int
vaccess(file_mode, uid, gid, acc_mode, cred)
mode_t file_mode;
uid_t uid;
gid_t gid;
mode_t acc_mode;
struct ucred *cred;
{
mode_t mask;
/* User id 0 always gets access. */
if (cred->cr_uid == 0)
return 0;
mask = 0;
/* Otherwise, check the owner. */
if (cred->cr_uid == uid) {
if (acc_mode & VEXEC)
mask |= S_IXUSR;
if (acc_mode & VREAD)
mask |= S_IRUSR;
if (acc_mode & VWRITE)
mask |= S_IWUSR;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/* Otherwise, check the groups. */
if (cred->cr_gid == gid || groupmember(gid, cred)) {
if (acc_mode & VEXEC)
mask |= S_IXGRP;
if (acc_mode & VREAD)
mask |= S_IRGRP;
if (acc_mode & VWRITE)
mask |= S_IWGRP;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/* Otherwise, check everyone else. */
if (acc_mode & VEXEC)
mask |= S_IXOTH;
if (acc_mode & VREAD)
mask |= S_IROTH;
if (acc_mode & VWRITE)
mask |= S_IWOTH;
return (file_mode & mask) == mask ? 0 : EACCES;
}
/*
* Unmount all file systems.
* We traverse the list in reverse order under the assumption that doing so
* will avoid needing to worry about dependencies.
*/
void
vfs_unmountall()
{
register struct mount *mp, *nmp;
int allerror, error, again = 1;
retry:
allerror = 0;
for (mp = CIRCLEQ_LAST(&mountlist); mp != CIRCLEQ_END(&mountlist);
mp = nmp) {
nmp = CIRCLEQ_PREV(mp, mnt_list);
if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) {
printf("unmount of %s failed with error %d\n",
mp->mnt_stat.f_mntonname, error);
allerror = 1;
}
}
if (allerror) {
printf("WARNING: some file systems would not unmount\n");
if (again) {
printf("retrying\n");
again = 0;
goto retry;
}
}
}
/*
* Sync and unmount file systems before shutting down.
*/
void
vfs_shutdown()
{
/* XXX Should suspend scheduling. */
(void) spl0();
printf("syncing disks... ");
if (panicstr == 0) {
/* Release inodes held by texts before update. */
#if !defined(UVM)
vnode_pager_umount(NULL);
#endif
#ifdef notdef
vnshutdown();
#endif
/* Sync before unmount, in case we hang on something. */
sys_sync(&proc0, (void *)0, (register_t *)0);
/* Unmount file systems. */
vfs_unmountall();
}
if (vfs_syncwait(1))
printf("giving up\n");
else
printf("done\n");
}
/*
* perform sync() operation and wait for buffers to flush.
* assumtions: called w/ scheduler disabled and physical io enabled
* for now called at spl0() XXX
*/
int
vfs_syncwait(verbose)
int verbose;
{
register struct buf *bp;
int iter, nbusy, dcount, s;
struct proc *p;
p = curproc? curproc : &proc0;
sys_sync(p, (void *)0, (register_t *)0);
/* Wait for sync to finish. */
dcount = 10000;
for (iter = 0; iter < 20; iter++) {
nbusy = 0;
for (bp = &buf[nbuf]; --bp >= buf; ) {
if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY)
nbusy++;
/*
* With soft updates, some buffers that are
* written will be remarked as dirty until other
* buffers are written.
*/
if (bp->b_flags & B_DELWRI) {
s = splbio();
bremfree(bp);
bp->b_flags |= B_BUSY;
splx(s);
nbusy++;
bawrite(bp);
if (dcount-- <= 0) {
if (verbose)
printf("softdep ");
return 1;
}
}
}
if (nbusy == 0)
break;
if (verbose)
printf("%d ", nbusy);
DELAY(40000 * iter);
}
return nbusy;
}
/*
* posix file system related system variables.
*/
int
fs_posix_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
/* all sysctl names at this level are terminal */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case FS_POSIX_SETUID:
if (newp && securelevel > 0)
return (EPERM);
return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear));
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
/*
* file system related system variables.
*/
int
fs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
sysctlfn *fn;
switch (name[0]) {
case FS_POSIX:
fn = fs_posix_sysctl;
break;
default:
return (EOPNOTSUPP);
}
return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p);
}
/*
* Routines dealing with vnodes and buffers
*/
/*
* Wait for all outstanding I/Os to complete
*
* Manipulates v_numoutput. Must be called at splbio()
*/
int
vwaitforio(vp, slpflag, wmesg, timeo)
struct vnode *vp;
int slpflag, timeo;
char *wmesg;
{
int error = 0;
while (vp->v_numoutput) {
vp->v_bioflag |= VBIOWAIT;
error = tsleep((caddr_t)&vp->v_numoutput,
slpflag | (PRIBIO + 1), wmesg, timeo);
if (error)
break;
}
return (error);
}
/*
* Update outstanding I/O count and do wakeup if requested.
*
* Manipulates v_numoutput. Must be called at splbio()
*/
void
vwakeup(vp)
struct vnode *vp;
{
if (vp != NULL) {
if (vp->v_numoutput-- == 0)
panic("vwakeup: neg numoutput");
if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) {
vp->v_bioflag &= ~VBIOWAIT;
wakeup((caddr_t)&vp->v_numoutput);
}
}
}
/*
* Flush out and invalidate all buffers associated with a vnode.
* Called with the underlying object locked.
*/
int
vinvalbuf(vp, flags, cred, p, slpflag, slptimeo)
register struct vnode *vp;
int flags;
struct ucred *cred;
struct proc *p;
int slpflag, slptimeo;
{
register struct buf *bp;
struct buf *nbp, *blist;
int s, error;
if (flags & V_SAVE) {
s = splbio();
vwaitforio(vp, 0, "vinvalbuf", 0);
if (vp->v_dirtyblkhd.lh_first != NULL) {
splx(s);
if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0)
return (error);
s = splbio();
if (vp->v_numoutput > 0 ||
vp->v_dirtyblkhd.lh_first != NULL)
panic("vinvalbuf: dirty bufs");
}
splx(s);
}
loop:
s = splbio();
for (;;) {
if ((blist = vp->v_cleanblkhd.lh_first) &&
(flags & V_SAVEMETA))
while (blist && blist->b_lblkno < 0)
blist = blist->b_vnbufs.le_next;
if (!blist && (blist = vp->v_dirtyblkhd.lh_first) &&
(flags & V_SAVEMETA))
while (blist && blist->b_lblkno < 0)
blist = blist->b_vnbufs.le_next;
if (!blist)
break;
for (bp = blist; bp; bp = nbp) {
nbp = bp->b_vnbufs.le_next;
if (flags & V_SAVEMETA && bp->b_lblkno < 0)
continue;
if (bp->b_flags & B_BUSY) {
bp->b_flags |= B_WANTED;
error = tsleep((caddr_t)bp,
slpflag | (PRIBIO + 1), "vinvalbuf",
slptimeo);
if (error) {
splx(s);
return (error);
}
break;
}
bp->b_flags |= B_BUSY | B_VFLUSH;
/*
* XXX Since there are no node locks for NFS, I believe
* there is a slight chance that a delayed write will
* occur while sleeping just above, so check for it.
*/
if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) {
splx(s);
(void) VOP_BWRITE(bp);
goto loop;
}
bp->b_flags |= B_INVAL;
brelse(bp);
}
}
if (!(flags & V_SAVEMETA) &&
(vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first))
panic("vinvalbuf: flush failed");
splx(s);
return (0);
}
void
vflushbuf(vp, sync)
register struct vnode *vp;
int sync;
{
register struct buf *bp, *nbp;
int s;
loop:
s = splbio();
for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) {
nbp = bp->b_vnbufs.le_next;
if ((bp->b_flags & B_BUSY))
continue;
if ((bp->b_flags & B_DELWRI) == 0)
panic("vflushbuf: not dirty");
bp->b_flags |= B_BUSY | B_VFLUSH;
splx(s);
/*
* Wait for I/O associated with indirect blocks to complete,
* since there is no way to quickly wait for them below.
*/
if (bp->b_vp == vp || sync == 0)
(void) bawrite(bp);
else
(void) bwrite(bp);
goto loop;
}
if (sync == 0) {
splx(s);
return;
}
vwaitforio(vp, 0, "vflushbuf", 0);
if (vp->v_dirtyblkhd.lh_first != NULL) {
splx(s);
vprint("vflushbuf: dirty", vp);
goto loop;
}
splx(s);
}
/*
* Associate a buffer with a vnode.
*
* Manipulates buffer vnode queues. Must be called at splbio().
*/
void
bgetvp(vp, bp)
register struct vnode *vp;
register struct buf *bp;
{
if (bp->b_vp)
panic("bgetvp: not free");
vhold(vp);
bp->b_vp = vp;
if (vp->v_type == VBLK || vp->v_type == VCHR)
bp->b_dev = vp->v_rdev;
else
bp->b_dev = NODEV;
/*
* Insert onto list for new vnode.
*/
bufinsvn(bp, &vp->v_cleanblkhd);
}
/*
* Disassociate a buffer from a vnode.
*
* Manipulates vnode buffer queues. Must be called at splbio().
*/
void
brelvp(bp)
register struct buf *bp;
{
struct vnode *vp;
if ((vp = bp->b_vp) == (struct vnode *) 0)
panic("brelvp: NULL");
/*
* Delete from old vnode list, if on one.
*/
if (bp->b_vnbufs.le_next != NOLIST)
bufremvn(bp);
if ((vp->v_bioflag & VBIOONSYNCLIST) &&
LIST_FIRST(&vp->v_dirtyblkhd) == NULL) {
vp->v_bioflag &= ~VBIOONSYNCLIST;
LIST_REMOVE(vp, v_synclist);
}
bp->b_vp = (struct vnode *) 0;
simple_lock(&vp->v_interlock);
#ifdef DIAGNOSTIC
if (vp->v_holdcnt == 0)
panic("brelvp: holdcnt");
#endif
vp->v_holdcnt--;
/*
* If it is on the holdlist and the hold count drops to
* zero, move it to the free list.
*/
if ((vp->v_bioflag & VBIOONFREELIST) &&
vp->v_holdcnt == 0 && vp->v_usecount == 0) {
simple_lock(&vnode_free_list_slock);
TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
simple_unlock(&vnode_free_list_slock);
}
simple_unlock(&vp->v_interlock);
}
/*
* Replaces the current vnode associated with the buffer, if any
* with a new vnode.
*
* If an output I/O is pending on the buffer, the old vnode is
* I/O count is adjusted.
*
* Ignores vnode buffer queues. Must be called at splbio().
*/
void
buf_replacevnode(bp, newvp)
struct buf *bp;
struct vnode *newvp;
{
struct vnode *oldvp = bp->b_vp;
if (oldvp)
brelvp(bp);
if ((bp->b_flags & (B_READ | B_DONE)) == 0) {
newvp->v_numoutput++; /* put it on swapdev */
vwakeup(oldvp);
}
bgetvp(newvp, bp);
bufremvn(bp);
}
/*
* Used to assign buffers to the appropriate clean or dirty list on
* the vnode and to add newly dirty vnodes to the appropriate
* filesystem syncer list.
*
* Manipulates vnode buffer queues. Must be called at splbio().
*/
void
reassignbuf(bp)
register struct buf *bp;
{
struct buflists *listheadp;
int delay;
struct vnode *vp = bp->b_vp;
if (vp == NULL) {
printf("reassignbuf: NULL");
return;
}
/*
* Delete from old vnode list, if on one.
*/
if (bp->b_vnbufs.le_next != NOLIST)
bufremvn(bp);
/*
* If dirty, put on list of dirty buffers;
* otherwise insert onto list of clean buffers.
*/
if ((bp->b_flags & B_DELWRI) == 0) {
listheadp = &vp->v_cleanblkhd;
if ((vp->v_bioflag & VBIOONSYNCLIST) &&
LIST_FIRST(&vp->v_dirtyblkhd) == NULL) {
vp->v_bioflag &= ~VBIOONSYNCLIST;
LIST_REMOVE(vp, v_synclist);
}
} else {
listheadp = &vp->v_dirtyblkhd;
if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) {
switch (vp->v_type) {
case VDIR:
delay = syncdelay / 2;
break;
case VBLK:
if (vp->v_specmountpoint != NULL) {
delay = syncdelay / 3;
break;
}
/* fall through */
default:
delay = syncdelay;
}
vn_syncer_add_to_worklist(vp, delay);
}
}
bufinsvn(bp, listheadp);
}
int
vfs_register(vfs)
struct vfsconf *vfs;
{
struct vfsconf *vfsp;
struct vfsconf **vfspp;
#ifdef DIAGNOSTIC
/* Paranoia? */
if (vfs->vfc_refcount != 0)
printf("vfs_register called with vfc_refcount > 0\n");
#endif
/* Check if filesystem already known */
for (vfspp = &vfsconf, vfsp = vfsconf;
vfsp;
vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next)
if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0)
return (EEXIST);
if (vfs->vfc_typenum > maxvfsconf)
maxvfsconf = vfs->vfc_typenum;
vfs->vfc_next = NULL;
/* Add to the end of the list */
*vfspp = vfs;
/* Call vfs_init() */
if (vfs->vfc_vfsops->vfs_init)
(*(vfs->vfc_vfsops->vfs_init))(vfs);
return 0;
}
int
vfs_unregister(vfs)
struct vfsconf *vfs;
{
struct vfsconf *vfsp;
struct vfsconf **vfspp;
int maxtypenum;
/* Find our vfsconf struct */
for (vfspp = &vfsconf, vfsp = vfsconf;
vfsp;
vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) {
if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0)
break;
}
if (!vfsp) /* Not found */
return (ENOENT);
if (vfsp->vfc_refcount) /* In use */
return (EBUSY);
/* Remove from list and free */
*vfspp = vfsp->vfc_next;
maxtypenum = 0;
for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
if (vfsp->vfc_typenum > maxtypenum)
maxtypenum = vfsp->vfc_typenum;
maxvfsconf = maxtypenum;
return 0;
}
/*
* Check if vnode represents a disk device
*/
int
vn_isdisk(vp, errp)
struct vnode *vp;
int *errp;
{
if (vp->v_type != VBLK && vp->v_type != VCHR)
return (0);
return (1);
}
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