114a8cff43
to be allocated at boot time. This is an expensive option, as they consume physical ram and are not pageable etc. In certain situations, this kind of option is quite useful, especially for news servers that access a large number of directories at random and torture the name cache. Defining 5000 or 10000 extra vnodes should cut down the amount of vnode recycling somewhat, which should allow better name and directory caching etc. This is a "your mileage may vary" option, with no real indication of what works best for your machine except trial and error. Too many will cost you ram that you could otherwise use for disk buffers etc. This is based on something John Dyson mentioned to me a while ago.
1548 lines
35 KiB
C
1548 lines
35 KiB
C
/*
|
|
* 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
|
|
* $Id: vfs_subr.c,v 1.53 1996/03/09 06:43:19 dyson Exp $
|
|
*/
|
|
|
|
/*
|
|
* External virtual filesystem routines
|
|
*/
|
|
#include "opt_ddb.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/file.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/time.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 <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <miscfs/specfs/specdev.h>
|
|
|
|
#ifdef DDB
|
|
extern void printlockedvnodes __P((void));
|
|
#endif
|
|
extern void vclean __P((struct vnode *vp, int flags));
|
|
extern void vfs_unmountroot __P((struct mount *rootfs));
|
|
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* 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; \
|
|
}
|
|
|
|
TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */
|
|
u_long freevnodes = 0;
|
|
|
|
struct mntlist mountlist; /* mounted filesystem list */
|
|
|
|
int desiredvnodes;
|
|
SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RD, &desiredvnodes, 0, "");
|
|
|
|
static void vfs_free_addrlist __P((struct netexport *nep));
|
|
static int vfs_free_netcred __P((struct radix_node *rn, void *w));
|
|
static int vfs_hang_addrlist __P((struct mount *mp, struct netexport *nep,
|
|
struct export_args *argp));
|
|
|
|
/*
|
|
* Initialize the vnode management data structures.
|
|
*/
|
|
void
|
|
vntblinit()
|
|
{
|
|
desiredvnodes = maxproc + vm_object_cache_max + extravnodes;
|
|
|
|
TAILQ_INIT(&vnode_free_list);
|
|
CIRCLEQ_INIT(&mountlist);
|
|
}
|
|
|
|
/*
|
|
* Lock a filesystem.
|
|
* Used to prevent access to it while mounting and unmounting.
|
|
*/
|
|
int
|
|
vfs_lock(mp)
|
|
register struct mount *mp;
|
|
{
|
|
|
|
while (mp->mnt_flag & MNT_MLOCK) {
|
|
mp->mnt_flag |= MNT_MWAIT;
|
|
(void) tsleep((caddr_t) mp, PVFS, "vfslck", 0);
|
|
}
|
|
mp->mnt_flag |= MNT_MLOCK;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unlock a locked filesystem.
|
|
* Panic if filesystem is not locked.
|
|
*/
|
|
void
|
|
vfs_unlock(mp)
|
|
register struct mount *mp;
|
|
{
|
|
|
|
if ((mp->mnt_flag & MNT_MLOCK) == 0)
|
|
panic("vfs_unlock: not locked");
|
|
mp->mnt_flag &= ~MNT_MLOCK;
|
|
if (mp->mnt_flag & MNT_MWAIT) {
|
|
mp->mnt_flag &= ~MNT_MWAIT;
|
|
wakeup((caddr_t) mp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Mark a mount point as busy.
|
|
* Used to synchronize access and to delay unmounting.
|
|
*/
|
|
int
|
|
vfs_busy(mp)
|
|
register struct mount *mp;
|
|
{
|
|
|
|
while (mp->mnt_flag & MNT_MPBUSY) {
|
|
mp->mnt_flag |= MNT_MPWANT;
|
|
(void) tsleep((caddr_t) &mp->mnt_flag, PVFS, "vfsbsy", 0);
|
|
}
|
|
if (mp->mnt_flag & MNT_UNMOUNT)
|
|
return (1);
|
|
mp->mnt_flag |= MNT_MPBUSY;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a busy filesystem.
|
|
* Panic if filesystem is not busy.
|
|
*/
|
|
void
|
|
vfs_unbusy(mp)
|
|
register struct mount *mp;
|
|
{
|
|
|
|
if ((mp->mnt_flag & MNT_MPBUSY) == 0)
|
|
panic("vfs_unbusy: not busy");
|
|
mp->mnt_flag &= ~MNT_MPBUSY;
|
|
if (mp->mnt_flag & MNT_MPWANT) {
|
|
mp->mnt_flag &= ~MNT_MPWANT;
|
|
wakeup((caddr_t) &mp->mnt_flag);
|
|
}
|
|
}
|
|
|
|
void
|
|
vfs_unmountroot(struct mount *rootfs)
|
|
{
|
|
struct mount *mp = rootfs;
|
|
int error;
|
|
|
|
if (vfs_busy(mp)) {
|
|
printf("failed to unmount root\n");
|
|
return;
|
|
}
|
|
mp->mnt_flag |= MNT_UNMOUNT;
|
|
if ((error = vfs_lock(mp))) {
|
|
printf("lock of root filesystem failed (%d)\n", error);
|
|
return;
|
|
}
|
|
vnode_pager_umount(mp); /* release cached vnodes */
|
|
cache_purgevfs(mp); /* remove cache entries for this file sys */
|
|
|
|
if ((error = VFS_SYNC(mp, MNT_WAIT, initproc->p_ucred, initproc)))
|
|
printf("sync of root filesystem failed (%d)\n", error);
|
|
|
|
if ((error = VFS_UNMOUNT(mp, MNT_FORCE, initproc))) {
|
|
printf("unmount of root filesystem failed (");
|
|
if (error == EBUSY)
|
|
printf("BUSY)\n");
|
|
else
|
|
printf("%d)\n", error);
|
|
}
|
|
mp->mnt_flag &= ~MNT_UNMOUNT;
|
|
vfs_unbusy(mp);
|
|
}
|
|
|
|
/*
|
|
* Unmount all filesystems. Should only be called by halt().
|
|
*/
|
|
void
|
|
vfs_unmountall()
|
|
{
|
|
struct mount *mp, *nmp, *rootfs = NULL;
|
|
int error;
|
|
|
|
/* unmount all but rootfs */
|
|
for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) {
|
|
nmp = mp->mnt_list.cqe_prev;
|
|
|
|
if (mp->mnt_flag & MNT_ROOTFS) {
|
|
rootfs = mp;
|
|
continue;
|
|
}
|
|
error = dounmount(mp, MNT_FORCE, initproc);
|
|
if (error) {
|
|
printf("unmount of %s failed (", mp->mnt_stat.f_mntonname);
|
|
if (error == EBUSY)
|
|
printf("BUSY)\n");
|
|
else
|
|
printf("%d)\n", error);
|
|
}
|
|
}
|
|
|
|
/* and finally... */
|
|
if (rootfs) {
|
|
vfs_unmountroot(rootfs);
|
|
} else {
|
|
printf("no root filesystem\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lookup a mount point by filesystem identifier.
|
|
*/
|
|
struct mount *
|
|
getvfs(fsid)
|
|
fsid_t *fsid;
|
|
{
|
|
register struct mount *mp;
|
|
|
|
for (mp = mountlist.cqh_first; mp != (void *)&mountlist;
|
|
mp = mp->mnt_list.cqe_next) {
|
|
if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
|
|
mp->mnt_stat.f_fsid.val[1] == fsid->val[1])
|
|
return (mp);
|
|
}
|
|
return ((struct mount *) 0);
|
|
}
|
|
|
|
/*
|
|
* Get a new unique fsid
|
|
*/
|
|
void
|
|
getnewfsid(mp, mtype)
|
|
struct mount *mp;
|
|
int mtype;
|
|
{
|
|
static u_short xxxfs_mntid;
|
|
|
|
fsid_t tfsid;
|
|
|
|
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 (mountlist.cqh_first != (void *)&mountlist) {
|
|
while (getvfs(&tfsid)) {
|
|
tfsid.val[0]++;
|
|
xxxfs_mntid++;
|
|
}
|
|
}
|
|
mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
|
|
}
|
|
|
|
/*
|
|
* Set vnode attributes to VNOVAL
|
|
*/
|
|
void
|
|
vattr_null(vap)
|
|
register struct vattr *vap;
|
|
{
|
|
|
|
vap->va_type = VNON;
|
|
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.ts_sec = vap->va_atime.ts_nsec =
|
|
vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec =
|
|
vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec =
|
|
vap->va_flags = vap->va_gen = VNOVAL;
|
|
vap->va_vaflags = 0;
|
|
}
|
|
|
|
/*
|
|
* Routines having to do with the management of the vnode table.
|
|
*/
|
|
extern vop_t **dead_vnodeop_p;
|
|
|
|
/*
|
|
* Return the next vnode from the free list.
|
|
*/
|
|
int
|
|
getnewvnode(tag, mp, vops, vpp)
|
|
enum vtagtype tag;
|
|
struct mount *mp;
|
|
vop_t **vops;
|
|
struct vnode **vpp;
|
|
{
|
|
register struct vnode *vp;
|
|
|
|
retry:
|
|
vp = vnode_free_list.tqh_first;
|
|
/*
|
|
* we allocate a new vnode if
|
|
* 1. we don't have any free
|
|
* Pretty obvious, we actually used to panic, but that
|
|
* is a silly thing to do.
|
|
* 2. we havn't filled our pool yet
|
|
* We don't want to trash the incore (VM-)vnodecache.
|
|
* 3. if less that 1/4th of our vnodes are free.
|
|
* We don't want to trash the namei cache either.
|
|
*/
|
|
if (freevnodes < (numvnodes >> 2) ||
|
|
numvnodes < desiredvnodes ||
|
|
vp == NULL) {
|
|
vp = (struct vnode *) malloc((u_long) sizeof *vp,
|
|
M_VNODE, M_WAITOK);
|
|
bzero((char *) vp, sizeof *vp);
|
|
numvnodes++;
|
|
} else {
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
if (vp->v_usage > 0) {
|
|
--vp->v_usage;
|
|
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
|
goto retry;
|
|
}
|
|
freevnodes--;
|
|
if (vp->v_usecount)
|
|
panic("free vnode isn't");
|
|
|
|
/* see comment on why 0xdeadb is set at end of vgone (below) */
|
|
vp->v_freelist.tqe_prev = (struct vnode **) 0xdeadb;
|
|
vp->v_lease = NULL;
|
|
if (vp->v_type != VBAD)
|
|
vgone(vp);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
{
|
|
int s;
|
|
|
|
if (vp->v_data)
|
|
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_lastr = 0;
|
|
vp->v_ralen = 0;
|
|
vp->v_maxra = 0;
|
|
vp->v_lastw = 0;
|
|
vp->v_lasta = 0;
|
|
vp->v_cstart = 0;
|
|
vp->v_clen = 0;
|
|
vp->v_socket = 0;
|
|
vp->v_writecount = 0; /* XXX */
|
|
vp->v_usage = 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;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Move a vnode from one mount queue to another.
|
|
*/
|
|
void
|
|
insmntque(vp, mp)
|
|
register struct vnode *vp;
|
|
register struct mount *mp;
|
|
{
|
|
|
|
/*
|
|
* 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)
|
|
return;
|
|
LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
|
|
}
|
|
|
|
/*
|
|
* Update outstanding I/O count and do wakeup if requested.
|
|
*/
|
|
void
|
|
vwakeup(bp)
|
|
register struct buf *bp;
|
|
{
|
|
register struct vnode *vp;
|
|
|
|
bp->b_flags &= ~B_WRITEINPROG;
|
|
if ((vp = bp->b_vp)) {
|
|
vp->v_numoutput--;
|
|
if (vp->v_numoutput < 0)
|
|
panic("vwakeup: neg numoutput");
|
|
if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) {
|
|
vp->v_flag &= ~VBWAIT;
|
|
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;
|
|
vm_object_t object;
|
|
|
|
if (flags & V_SAVE) {
|
|
if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)))
|
|
return (error);
|
|
if (vp->v_dirtyblkhd.lh_first != NULL)
|
|
panic("vinvalbuf: dirty bufs");
|
|
}
|
|
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;
|
|
s = splbio();
|
|
if (bp->b_flags & B_BUSY) {
|
|
bp->b_flags |= B_WANTED;
|
|
error = tsleep((caddr_t) bp,
|
|
slpflag | (PRIBIO + 1), "vinvalbuf",
|
|
slptimeo);
|
|
splx(s);
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
}
|
|
bremfree(bp);
|
|
bp->b_flags |= B_BUSY;
|
|
splx(s);
|
|
/*
|
|
* 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)) {
|
|
(void) VOP_BWRITE(bp);
|
|
break;
|
|
}
|
|
bp->b_flags |= (B_INVAL|B_NOCACHE|B_RELBUF);
|
|
brelse(bp);
|
|
}
|
|
}
|
|
|
|
s = splbio();
|
|
while (vp->v_numoutput > 0) {
|
|
vp->v_flag |= VBWAIT;
|
|
tsleep(&vp->v_numoutput, PVM, "vnvlbv", 0);
|
|
}
|
|
splx(s);
|
|
|
|
/*
|
|
* Destroy the copy in the VM cache, too.
|
|
*/
|
|
object = vp->v_object;
|
|
if (object != NULL) {
|
|
vm_object_page_remove(object, 0, object->size,
|
|
(flags & V_SAVE) ? TRUE : FALSE);
|
|
}
|
|
if (!(flags & V_SAVEMETA) &&
|
|
(vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first))
|
|
panic("vinvalbuf: flush failed");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Associate a buffer with a vnode.
|
|
*/
|
|
void
|
|
bgetvp(vp, bp)
|
|
register struct vnode *vp;
|
|
register struct buf *bp;
|
|
{
|
|
int s;
|
|
|
|
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.
|
|
*/
|
|
s = splbio();
|
|
bufinsvn(bp, &vp->v_cleanblkhd);
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Disassociate a buffer from a vnode.
|
|
*/
|
|
void
|
|
brelvp(bp)
|
|
register struct buf *bp;
|
|
{
|
|
struct vnode *vp;
|
|
int s;
|
|
|
|
if (bp->b_vp == (struct vnode *) 0)
|
|
panic("brelvp: NULL");
|
|
/*
|
|
* Delete from old vnode list, if on one.
|
|
*/
|
|
s = splbio();
|
|
if (bp->b_vnbufs.le_next != NOLIST)
|
|
bufremvn(bp);
|
|
splx(s);
|
|
|
|
vp = bp->b_vp;
|
|
bp->b_vp = (struct vnode *) 0;
|
|
HOLDRELE(vp);
|
|
}
|
|
|
|
/*
|
|
* Associate a p-buffer with a vnode.
|
|
*/
|
|
void
|
|
pbgetvp(vp, bp)
|
|
register struct vnode *vp;
|
|
register struct buf *bp;
|
|
{
|
|
if (bp->b_vp)
|
|
panic("pbgetvp: 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;
|
|
}
|
|
|
|
/*
|
|
* Disassociate a p-buffer from a vnode.
|
|
*/
|
|
void
|
|
pbrelvp(bp)
|
|
register struct buf *bp;
|
|
{
|
|
struct vnode *vp;
|
|
|
|
if (bp->b_vp == (struct vnode *) 0)
|
|
panic("brelvp: NULL");
|
|
|
|
vp = bp->b_vp;
|
|
bp->b_vp = (struct vnode *) 0;
|
|
HOLDRELE(vp);
|
|
}
|
|
|
|
/*
|
|
* Reassign a buffer from one vnode to another.
|
|
* Used to assign file specific control information
|
|
* (indirect blocks) to the vnode to which they belong.
|
|
*/
|
|
void
|
|
reassignbuf(bp, newvp)
|
|
register struct buf *bp;
|
|
register struct vnode *newvp;
|
|
{
|
|
register struct buflists *listheadp;
|
|
|
|
if (newvp == 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) {
|
|
struct buf *tbp;
|
|
|
|
tbp = newvp->v_dirtyblkhd.lh_first;
|
|
if (!tbp || (tbp->b_lblkno > bp->b_lblkno)) {
|
|
bufinsvn(bp, &newvp->v_dirtyblkhd);
|
|
} else {
|
|
while (tbp->b_vnbufs.le_next &&
|
|
(tbp->b_vnbufs.le_next->b_lblkno < bp->b_lblkno)) {
|
|
tbp = tbp->b_vnbufs.le_next;
|
|
}
|
|
LIST_INSERT_AFTER(tbp, bp, b_vnbufs);
|
|
}
|
|
} else {
|
|
listheadp = &newvp->v_cleanblkhd;
|
|
bufinsvn(bp, listheadp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
register struct vnode *vp;
|
|
struct vnode *nvp;
|
|
int error;
|
|
|
|
if (dev == NODEV)
|
|
return (0);
|
|
error = getnewvnode(VT_NON, (struct mount *) 0, spec_vnodeop_p, &nvp);
|
|
if (error) {
|
|
*vpp = 0;
|
|
return (error);
|
|
}
|
|
vp = nvp;
|
|
vp->v_type = VBLK;
|
|
if ((nvp = checkalias(vp, dev, (struct mount *) 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;
|
|
{
|
|
register struct vnode *vp;
|
|
struct vnode **vpp;
|
|
|
|
if (nvp->v_type != VBLK && nvp->v_type != VCHR)
|
|
return (NULLVP);
|
|
|
|
vpp = &speclisth[SPECHASH(nvp_rdev)];
|
|
loop:
|
|
for (vp = *vpp; vp; vp = vp->v_specnext) {
|
|
if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type)
|
|
continue;
|
|
/*
|
|
* Alias, but not in use, so flush it out.
|
|
*/
|
|
if (vp->v_usecount == 0) {
|
|
vgone(vp);
|
|
goto loop;
|
|
}
|
|
if (vget(vp, 1))
|
|
goto loop;
|
|
break;
|
|
}
|
|
if (vp == NULL || vp->v_tag != VT_NON) {
|
|
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_specflags = 0;
|
|
*vpp = nvp;
|
|
if (vp != NULL) {
|
|
nvp->v_flag |= VALIASED;
|
|
vp->v_flag |= VALIASED;
|
|
vput(vp);
|
|
}
|
|
return (NULLVP);
|
|
}
|
|
VOP_UNLOCK(vp);
|
|
vclean(vp, 0);
|
|
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, lockflag)
|
|
register struct vnode *vp;
|
|
int lockflag;
|
|
{
|
|
|
|
/*
|
|
* 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 either by checking that the VXLOCK flag is
|
|
* set, or that the use count is zero with the back pointer set to
|
|
* show that it has been removed from the free list by getnewvnode.
|
|
* The VXLOCK flag may not have been set yet because vclean is blocked
|
|
* in the VOP_LOCK call waiting for the VOP_INACTIVE to complete.
|
|
*/
|
|
if ((vp->v_flag & VXLOCK) ||
|
|
(vp->v_usecount == 0 &&
|
|
vp->v_freelist.tqe_prev == (struct vnode **) 0xdeadb)) {
|
|
vp->v_flag |= VXWANT;
|
|
(void) tsleep((caddr_t) vp, PINOD, "vget", 0);
|
|
return (1);
|
|
}
|
|
if (vp->v_usecount == 0) {
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
freevnodes--;
|
|
}
|
|
vp->v_usecount++;
|
|
if (lockflag)
|
|
VOP_LOCK(vp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode reference, just increment the count
|
|
*/
|
|
void
|
|
vref(vp)
|
|
struct vnode *vp;
|
|
{
|
|
|
|
if (vp->v_usecount <= 0)
|
|
panic("vref used where vget required");
|
|
vp->v_usecount++;
|
|
}
|
|
|
|
/*
|
|
* vput(), just unlock and vrele()
|
|
*/
|
|
void
|
|
vput(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
|
|
VOP_UNLOCK(vp);
|
|
vrele(vp);
|
|
}
|
|
|
|
/*
|
|
* Vnode release.
|
|
* If count drops to zero, call inactive routine and return to freelist.
|
|
*/
|
|
void
|
|
vrele(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vp == NULL)
|
|
panic("vrele: null vp");
|
|
#endif
|
|
vp->v_usecount--;
|
|
if (vp->v_usecount > 0)
|
|
return;
|
|
if (vp->v_usecount < 0 /* || vp->v_writecount < 0 */ ) {
|
|
#ifdef DIAGNOSTIC
|
|
vprint("vrele: negative ref count", vp);
|
|
#endif
|
|
panic("vrele: negative reference cnt");
|
|
}
|
|
if (vp->v_flag & VAGE) {
|
|
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
|
vp->v_flag &= ~VAGE;
|
|
vp->v_usage = 0;
|
|
} else {
|
|
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
|
}
|
|
freevnodes++;
|
|
|
|
VOP_INACTIVE(vp);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* Page or buffer structure gets a reference.
|
|
*/
|
|
void
|
|
vhold(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
|
|
vp->v_holdcnt++;
|
|
}
|
|
|
|
/*
|
|
* Page or buffer structure frees a reference.
|
|
*/
|
|
void
|
|
holdrele(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
|
|
if (vp->v_holdcnt <= 0)
|
|
panic("holdrele: holdcnt");
|
|
vp->v_holdcnt--;
|
|
}
|
|
#endif /* DIAGNOSTIC */
|
|
|
|
/*
|
|
* 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 DIAGNOSTIC
|
|
static int busyprt = 0; /* print out busy vnodes */
|
|
SYSCTL_INT(_debug, 1, busyprt, CTLFLAG_RW, &busyprt, 0, "");
|
|
#endif
|
|
|
|
int
|
|
vflush(mp, skipvp, flags)
|
|
struct mount *mp;
|
|
struct vnode *skipvp;
|
|
int flags;
|
|
{
|
|
register struct vnode *vp, *nvp;
|
|
int busy = 0;
|
|
|
|
if ((mp->mnt_flag & MNT_MPBUSY) == 0)
|
|
panic("vflush: not busy");
|
|
loop:
|
|
for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) {
|
|
/*
|
|
* Make sure this vnode wasn't reclaimed in getnewvnode().
|
|
* Start over if it has (it won't be on the list anymore).
|
|
*/
|
|
if (vp->v_mount != mp)
|
|
goto loop;
|
|
nvp = vp->v_mntvnodes.le_next;
|
|
/*
|
|
* Skip over a selected vnode.
|
|
*/
|
|
if (vp == skipvp)
|
|
continue;
|
|
/*
|
|
* Skip over a vnodes marked VSYSTEM.
|
|
*/
|
|
if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM))
|
|
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))
|
|
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) {
|
|
vgone(vp);
|
|
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) {
|
|
if (vp->v_type != VBLK && vp->v_type != VCHR) {
|
|
vgone(vp);
|
|
} else {
|
|
vclean(vp, 0);
|
|
vp->v_op = spec_vnodeop_p;
|
|
insmntque(vp, (struct mount *) 0);
|
|
}
|
|
continue;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (busyprt)
|
|
vprint("vflush: busy vnode", vp);
|
|
#endif
|
|
busy++;
|
|
}
|
|
if (busy)
|
|
return (EBUSY);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Disassociate the underlying file system from a vnode.
|
|
*/
|
|
void
|
|
vclean(struct vnode *vp, int flags)
|
|
{
|
|
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))
|
|
VREF(vp);
|
|
/*
|
|
* 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);
|
|
/*
|
|
* 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;
|
|
/*
|
|
* Clean out any buffers associated with the vnode.
|
|
*/
|
|
if (flags & DOCLOSE)
|
|
vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0);
|
|
/*
|
|
* Any other processes trying to obtain this lock must first wait for
|
|
* VXLOCK to clear, then call the new lock operation.
|
|
*/
|
|
VOP_UNLOCK(vp);
|
|
/*
|
|
* If purging an active vnode, it must be closed and deactivated
|
|
* before being reclaimed.
|
|
*/
|
|
if (active) {
|
|
if (flags & DOCLOSE)
|
|
VOP_CLOSE(vp, FNONBLOCK, NOCRED, NULL);
|
|
VOP_INACTIVE(vp);
|
|
}
|
|
/*
|
|
* Reclaim the vnode.
|
|
*/
|
|
if (VOP_RECLAIM(vp))
|
|
panic("vclean: cannot reclaim");
|
|
if (active)
|
|
vrele(vp);
|
|
|
|
/*
|
|
* Done with purge, notify sleepers of the grim news.
|
|
*/
|
|
vp->v_op = dead_vnodeop_p;
|
|
vp->v_tag = VT_NON;
|
|
vp->v_flag &= ~VXLOCK;
|
|
if (vp->v_flag & VXWANT) {
|
|
vp->v_flag &= ~VXWANT;
|
|
wakeup((caddr_t) vp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Eliminate all activity associated with the requested vnode
|
|
* and with all vnodes aliased to the requested vnode.
|
|
*/
|
|
void
|
|
vgoneall(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
register struct vnode *vq;
|
|
|
|
if (vp->v_flag & VALIASED) {
|
|
/*
|
|
* 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;
|
|
(void) tsleep((caddr_t) vp, PINOD, "vgall", 0);
|
|
return;
|
|
}
|
|
/*
|
|
* Ensure that vp will not be vgone'd while we are eliminating
|
|
* its aliases.
|
|
*/
|
|
vp->v_flag |= VXLOCK;
|
|
while (vp->v_flag & VALIASED) {
|
|
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
|
|
if (vq->v_rdev != vp->v_rdev ||
|
|
vq->v_type != vp->v_type || vp == vq)
|
|
continue;
|
|
vgone(vq);
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* Remove the lock so that vgone below will really eliminate
|
|
* the vnode after which time vgone will awaken any sleepers.
|
|
*/
|
|
vp->v_flag &= ~VXLOCK;
|
|
}
|
|
vgone(vp);
|
|
}
|
|
|
|
/*
|
|
* Eliminate all activity associated with a vnode
|
|
* in preparation for reuse.
|
|
*/
|
|
void
|
|
vgone(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
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;
|
|
(void) tsleep((caddr_t) vp, PINOD, "vgone", 0);
|
|
return;
|
|
}
|
|
/*
|
|
* Clean out the filesystem specific data.
|
|
*/
|
|
vclean(vp, DOCLOSE);
|
|
/*
|
|
* Delete from old mount point vnode list, if on one.
|
|
*/
|
|
if (vp->v_mount != NULL) {
|
|
LIST_REMOVE(vp, v_mntvnodes);
|
|
vp->v_mount = NULL;
|
|
}
|
|
/*
|
|
* If special device, remove it from special device alias list.
|
|
*/
|
|
if (vp->v_type == VBLK || vp->v_type == VCHR) {
|
|
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;
|
|
}
|
|
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. The test of the back pointer and the
|
|
* reference count of zero is because it will be removed from the free
|
|
* list by getnewvnode, but will not have its reference count
|
|
* incremented until after calling vgone. If the reference count were
|
|
* incremented first, vgone would (incorrectly) try to close the
|
|
* previous instance of the underlying object. So, the back pointer is
|
|
* explicitly set to `0xdeadb' in getnewvnode after removing it from
|
|
* the freelist to ensure that we do not try to move it here.
|
|
*/
|
|
if (vp->v_usecount == 0 &&
|
|
vp->v_freelist.tqe_prev != (struct vnode **) 0xdeadb &&
|
|
vnode_free_list.tqh_first != vp) {
|
|
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
|
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
|
}
|
|
vp->v_type = VBAD;
|
|
}
|
|
|
|
/*
|
|
* Lookup a vnode by device number.
|
|
*/
|
|
int
|
|
vfinddev(dev, type, vpp)
|
|
dev_t dev;
|
|
enum vtype type;
|
|
struct vnode **vpp;
|
|
{
|
|
register struct vnode *vp;
|
|
|
|
for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
|
|
if (dev != vp->v_rdev || type != vp->v_type)
|
|
continue;
|
|
*vpp = vp;
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Calculate the total number of references to a special device.
|
|
*/
|
|
int
|
|
vcount(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
register struct vnode *vq, *vnext;
|
|
int count;
|
|
|
|
loop:
|
|
if ((vp->v_flag & VALIASED) == 0)
|
|
return (vp->v_usecount);
|
|
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) {
|
|
vgone(vq);
|
|
goto loop;
|
|
}
|
|
count += vq->v_usecount;
|
|
}
|
|
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 %d, writecount %d, refcount %ld,",
|
|
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_flag & VBWAIT)
|
|
strcat(buf, "|VBWAIT");
|
|
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 DDB
|
|
/*
|
|
* List all of the locked vnodes in the system.
|
|
* Called when debugging the kernel.
|
|
*/
|
|
void
|
|
printlockedvnodes(void)
|
|
{
|
|
register struct mount *mp;
|
|
register struct vnode *vp;
|
|
|
|
printf("Locked vnodes\n");
|
|
for (mp = mountlist.cqh_first; mp != (void *)&mountlist;
|
|
mp = mp->mnt_list.cqe_next) {
|
|
for (vp = mp->mnt_vnodelist.lh_first;
|
|
vp != NULL;
|
|
vp = vp->v_mntvnodes.le_next)
|
|
if (VOP_ISLOCKED(vp))
|
|
vprint((char *) 0, vp);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int kinfo_vdebug = 1;
|
|
int kinfo_vgetfailed;
|
|
|
|
#define KINFO_VNODESLOP 10
|
|
/*
|
|
* Dump vnode list (via sysctl).
|
|
* Copyout address of vnode followed by vnode.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
sysctl_vnode SYSCTL_HANDLER_ARGS
|
|
{
|
|
register struct mount *mp, *nmp;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
#define VPTRSZ sizeof (struct vnode *)
|
|
#define VNODESZ sizeof (struct vnode)
|
|
|
|
req->lock = 0;
|
|
if (!req->oldptr) /* Make an estimate */
|
|
return (SYSCTL_OUT(req, 0,
|
|
(numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ)));
|
|
|
|
for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
|
|
nmp = mp->mnt_list.cqe_next;
|
|
if (vfs_busy(mp))
|
|
continue;
|
|
again:
|
|
for (vp = mp->mnt_vnodelist.lh_first;
|
|
vp != NULL;
|
|
vp = vp->v_mntvnodes.le_next) {
|
|
/*
|
|
* Check that the vp is still associated with this
|
|
* filesystem. RACE: could have been recycled onto
|
|
* the same filesystem.
|
|
*/
|
|
if (vp->v_mount != mp) {
|
|
if (kinfo_vdebug)
|
|
printf("kinfo: vp changed\n");
|
|
goto again;
|
|
}
|
|
if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) ||
|
|
(error = SYSCTL_OUT(req, vp, VNODESZ))) {
|
|
vfs_unbusy(mp);
|
|
return (error);
|
|
}
|
|
}
|
|
vfs_unbusy(mp);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD,
|
|
0, 0, sysctl_vnode, "S,vnode", "");
|
|
|
|
/*
|
|
* Check to see if a filesystem is mounted on a block device.
|
|
*/
|
|
int
|
|
vfs_mountedon(vp)
|
|
register struct vnode *vp;
|
|
{
|
|
register struct vnode *vq;
|
|
|
|
if (vp->v_specflags & SI_MOUNTEDON)
|
|
return (EBUSY);
|
|
if (vp->v_flag & VALIASED) {
|
|
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_specflags & SI_MOUNTEDON)
|
|
return (EBUSY);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
vfs_hang_addrlist(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);
|
|
if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen)))
|
|
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_addr, (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 */
|
|
static int
|
|
vfs_free_netcred(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.
|
|
*/
|
|
static void
|
|
vfs_free_addrlist(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])) {
|
|
(*rnh->rnh_walktree) (rnh, vfs_free_netcred,
|
|
(caddr_t) 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)))
|
|
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);
|
|
}
|
|
|
|
|
|
/*
|
|
* perform msync on all vnodes under a mount point
|
|
* the mount point must be locked.
|
|
*/
|
|
void
|
|
vfs_msync(struct mount *mp, int flags) {
|
|
struct vnode *vp, *nvp;
|
|
loop:
|
|
for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
|
|
|
|
if (vp->v_mount != mp)
|
|
goto loop;
|
|
nvp = vp->v_mntvnodes.le_next;
|
|
if (VOP_ISLOCKED(vp) && (flags != MNT_WAIT))
|
|
continue;
|
|
if (vp->v_object &&
|
|
(((vm_object_t) vp->v_object)->flags & OBJ_MIGHTBEDIRTY)) {
|
|
vm_object_page_clean(vp->v_object, 0, 0, TRUE, TRUE);
|
|
}
|
|
}
|
|
}
|