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NetBSD/sys/ufs/ufs_quota.c

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/*
* Copyright (c) 1982, 1986, 1990 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Robert Elz at The University of Melbourne.
*
* 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.
*
* from: @(#)ufs_quota.c 7.11 (Berkeley) 6/21/91
* $Id: ufs_quota.c,v 1.2 1993/05/20 03:53:41 cgd Exp $
*/
#include "param.h"
#include "kernel.h"
#include "systm.h"
#include "namei.h"
#include "malloc.h"
#include "file.h"
#include "proc.h"
#include "vnode.h"
#include "mount.h"
#include "fs.h"
#include "quota.h"
#include "inode.h"
#include "ufsmount.h"
/*
* Quota name to error message mapping.
*/
static char *quotatypes[] = INITQFNAMES;
/*
* Set up the quotas for an inode.
*
* This routine completely defines the semantics of quotas.
* If other criterion want to be used to establish quotas, the
* MAXQUOTAS value in quotas.h should be increased, and the
* additional dquots set up here.
*/
getinoquota(ip)
register struct inode *ip;
{
struct ufsmount *ump;
struct vnode *vp = ITOV(ip);
int error;
ump = VFSTOUFS(vp->v_mount);
/*
* Set up the user quota based on file uid.
* EINVAL means that quotas are not enabled.
*/
if (ip->i_dquot[USRQUOTA] == NODQUOT &&
(error =
dqget(vp, ip->i_uid, ump, USRQUOTA, &ip->i_dquot[USRQUOTA])) &&
error != EINVAL)
return (error);
/*
* Set up the group quota based on file gid.
* EINVAL means that quotas are not enabled.
*/
if (ip->i_dquot[GRPQUOTA] == NODQUOT &&
(error =
dqget(vp, ip->i_gid, ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
error != EINVAL)
return (error);
return (0);
}
/*
* Update disk usage, and take corrective action.
*/
chkdq(ip, change, cred, flags)
register struct inode *ip;
long change;
struct ucred *cred;
int flags;
{
register struct dquot *dq;
register int i;
int ncurblocks, error;
#ifdef DIAGNOSTIC
if ((flags & CHOWN) == 0)
chkdquot(ip);
#endif
if (change == 0)
return (0);
if (change < 0) {
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+1);
}
ncurblocks = dq->dq_curblocks + change;
if (ncurblocks >= 0)
dq->dq_curblocks = ncurblocks;
else
dq->dq_curblocks = 0;
dq->dq_flags &= ~DQ_BLKS;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
if (error = chkdqchg(ip, change, cred, i))
return (error);
}
}
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+1);
}
dq->dq_curblocks += change;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
/*
* Check for a valid change to a users allocation.
* Issue an error message if appropriate.
*/
chkdqchg(ip, change, cred, type)
struct inode *ip;
long change;
struct ucred *cred;
int type;
{
register struct dquot *dq = ip->i_dquot[type];
long ncurblocks = dq->dq_curblocks + change;
/*
* If user would exceed their hard limit, disallow space allocation.
*/
if (ncurblocks >= dq->dq_bhardlimit && dq->dq_bhardlimit) {
if ((dq->dq_flags & DQ_BLKS) == 0 &&
ip->i_uid == cred->cr_uid) {
uprintf("\n%s: write failed, %s disk limit reached\n",
ip->i_fs->fs_fsmnt, quotatypes[type]);
dq->dq_flags |= DQ_BLKS;
}
return (EDQUOT);
}
/*
* If user is over their soft limit for too long, disallow space
* allocation. Reset time limit as they cross their soft limit.
*/
if (ncurblocks >= dq->dq_bsoftlimit && dq->dq_bsoftlimit) {
if (dq->dq_curblocks < dq->dq_bsoftlimit) {
dq->dq_btime = time.tv_sec +
VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type];
if (ip->i_uid == cred->cr_uid)
uprintf("\n%s: warning, %s %s\n",
ip->i_fs->fs_fsmnt, quotatypes[type],
"disk quota exceeded");
return (0);
}
if (time.tv_sec > dq->dq_btime) {
if ((dq->dq_flags & DQ_BLKS) == 0 &&
ip->i_uid == cred->cr_uid) {
uprintf("\n%s: write failed, %s %s\n",
ip->i_fs->fs_fsmnt, quotatypes[type],
"disk quota exceeded too long");
dq->dq_flags |= DQ_BLKS;
}
return (EDQUOT);
}
}
return (0);
}
/*
* Check the inode limit, applying corrective action.
*/
chkiq(ip, change, cred, flags)
register struct inode *ip;
long change;
struct ucred *cred;
int flags;
{
register struct dquot *dq;
register int i;
int ncurinodes, error;
#ifdef DIAGNOSTIC
if ((flags & CHOWN) == 0)
chkdquot(ip);
#endif
if (change == 0)
return (0);
if (change < 0) {
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+1);
}
ncurinodes = dq->dq_curinodes + change;
if (ncurinodes >= 0)
dq->dq_curinodes = ncurinodes;
else
dq->dq_curinodes = 0;
dq->dq_flags &= ~DQ_INODS;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
if ((flags & FORCE) == 0 && cred->cr_uid != 0) {
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
if (error = chkiqchg(ip, change, cred, i))
return (error);
}
}
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+1);
}
dq->dq_curinodes += change;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
/*
* Check for a valid change to a users allocation.
* Issue an error message if appropriate.
*/
chkiqchg(ip, change, cred, type)
struct inode *ip;
long change;
struct ucred *cred;
int type;
{
register struct dquot *dq = ip->i_dquot[type];
long ncurinodes = dq->dq_curinodes + change;
/*
* If user would exceed their hard limit, disallow inode allocation.
*/
if (ncurinodes >= dq->dq_ihardlimit && dq->dq_ihardlimit) {
if ((dq->dq_flags & DQ_INODS) == 0 &&
ip->i_uid == cred->cr_uid) {
uprintf("\n%s: write failed, %s inode limit reached\n",
ip->i_fs->fs_fsmnt, quotatypes[type]);
dq->dq_flags |= DQ_INODS;
}
return (EDQUOT);
}
/*
* If user is over their soft limit for too long, disallow inode
* allocation. Reset time limit as they cross their soft limit.
*/
if (ncurinodes >= dq->dq_isoftlimit && dq->dq_isoftlimit) {
if (dq->dq_curinodes < dq->dq_isoftlimit) {
dq->dq_itime = time.tv_sec +
VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type];
if (ip->i_uid == cred->cr_uid)
uprintf("\n%s: warning, %s %s\n",
ip->i_fs->fs_fsmnt, quotatypes[type],
"inode quota exceeded");
return (0);
}
if (time.tv_sec > dq->dq_itime) {
if ((dq->dq_flags & DQ_INODS) == 0 &&
ip->i_uid == cred->cr_uid) {
uprintf("\n%s: write failed, %s %s\n",
ip->i_fs->fs_fsmnt, quotatypes[type],
"inode quota exceeded too long");
dq->dq_flags |= DQ_INODS;
}
return (EDQUOT);
}
}
return (0);
}
#ifdef DIAGNOSTIC
/*
* On filesystems with quotas enabled,
* it is an error for a file to change size and not
* to have a dquot structure associated with it.
*/
chkdquot(ip)
register struct inode *ip;
{
struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount);
register int i;
for (i = 0; i < MAXQUOTAS; i++) {
if (ump->um_quotas[i] == NULLVP ||
(ump->um_qflags[i] & (QTF_OPENING|QTF_CLOSING)))
continue;
if (ip->i_dquot[i] == NODQUOT) {
vprint("chkdquot: missing dquot", ITOV(ip));
panic("missing dquot");
}
}
}
#endif /* DIAGNOSTIC */
/*
* Code to process quotactl commands.
*/
/*
* Q_QUOTAON - set up a quota file for a particular file system.
*/
quotaon(p, mp, type, fname)
struct proc *p;
struct mount *mp;
register int type;
caddr_t fname;
{
register struct ufsmount *ump = VFSTOUFS(mp);
register struct vnode *vp, **vpp;
struct vnode *nextvp;
struct dquot *dq;
int error;
struct nameidata nd;
vpp = &ump->um_quotas[type];
nd.ni_segflg = UIO_USERSPACE;
nd.ni_dirp = fname;
if (error = vn_open(&nd, p, FREAD|FWRITE, 0))
return (error);
vp = nd.ni_vp;
VOP_UNLOCK(vp);
if (vp->v_type != VREG) {
(void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
return (EACCES);
}
if (vfs_busy(mp)) {
(void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
return (EBUSY);
}
if (*vpp != vp)
quotaoff(p, mp, type);
ump->um_qflags[type] |= QTF_OPENING;
mp->mnt_flag |= MNT_QUOTA;
vp->v_flag |= VSYSTEM;
*vpp = vp;
/*
* Save the credential of the process that turned on quotas.
* Set up the time limits for this quota.
*/
crhold(p->p_ucred);
ump->um_cred[type] = p->p_ucred;
ump->um_btime[type] = MAX_DQ_TIME;
ump->um_itime[type] = MAX_IQ_TIME;
if (dqget(NULLVP, 0, ump, type, &dq) == 0) {
if (dq->dq_btime > 0)
ump->um_btime[type] = dq->dq_btime;
if (dq->dq_itime > 0)
ump->um_itime[type] = dq->dq_itime;
dqrele(NULLVP, dq);
}
/*
* Search vnodes associated with this mount point,
* adding references to quota file being opened.
* NB: only need to add dquot's for inodes being modified.
*/
again:
for (vp = mp->mnt_mounth; vp; vp = nextvp) {
nextvp = vp->v_mountf;
if (vp->v_writecount == 0)
continue;
if (vget(vp))
goto again;
if (error = getinoquota(VTOI(vp))) {
vput(vp);
break;
}
vput(vp);
if (vp->v_mountf != nextvp || vp->v_mount != mp)
goto again;
}
ump->um_qflags[type] &= ~QTF_OPENING;
if (error)
quotaoff(p, mp, type);
vfs_unbusy(mp);
return (error);
}
/*
* Q_QUOTAOFF - turn off disk quotas for a filesystem.
*/
quotaoff(p, mp, type)
struct proc *p;
struct mount *mp;
register int type;
{
register struct vnode *vp;
struct vnode *qvp, *nextvp;
struct ufsmount *ump = VFSTOUFS(mp);
register struct dquot *dq;
register struct inode *ip;
int error;
if ((mp->mnt_flag & MNT_MPBUSY) == 0)
panic("quotaoff: not busy");
if ((qvp = ump->um_quotas[type]) == NULLVP)
return (0);
ump->um_qflags[type] |= QTF_CLOSING;
/*
* Search vnodes associated with this mount point,
* deleting any references to quota file being closed.
*/
again:
for (vp = mp->mnt_mounth; vp; vp = nextvp) {
nextvp = vp->v_mountf;
if (vget(vp))
goto again;
ip = VTOI(vp);
dq = ip->i_dquot[type];
ip->i_dquot[type] = NODQUOT;
dqrele(vp, dq);
vput(vp);
if (vp->v_mountf != nextvp || vp->v_mount != mp)
goto again;
}
dqflush(qvp);
qvp->v_flag &= ~VSYSTEM;
error = vn_close(qvp, FREAD|FWRITE, p->p_ucred, p);
ump->um_quotas[type] = NULLVP;
crfree(ump->um_cred[type]);
ump->um_cred[type] = NOCRED;
ump->um_qflags[type] &= ~QTF_CLOSING;
for (type = 0; type < MAXQUOTAS; type++)
if (ump->um_quotas[type] != NULLVP)
break;
if (type == MAXQUOTAS)
mp->mnt_flag &= ~MNT_QUOTA;
return (error);
}
/*
* Q_GETQUOTA - return current values in a dqblk structure.
*/
getquota(mp, id, type, addr)
struct mount *mp;
u_long id;
int type;
caddr_t addr;
{
struct dquot *dq;
int error;
if (error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq))
return (error);
error = copyout((caddr_t)&dq->dq_dqb, addr, sizeof (struct dqblk));
dqrele(NULLVP, dq);
return (error);
}
/*
* Q_SETQUOTA - assign an entire dqblk structure.
*/
setquota(mp, id, type, addr)
struct mount *mp;
u_long id;
int type;
caddr_t addr;
{
register struct dquot *dq;
struct dquot *ndq;
struct ufsmount *ump = VFSTOUFS(mp);
struct dqblk newlim;
int error;
if (error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk)))
return (error);
if (error = dqget(NULLVP, id, ump, type, &ndq))
return (error);
dq = ndq;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+1);
}
/*
* Copy all but the current values.
* Reset time limit if previously had no soft limit or were
* under it, but now have a soft limit and are over it.
*/
newlim.dqb_curblocks = dq->dq_curblocks;
newlim.dqb_curinodes = dq->dq_curinodes;
if (dq->dq_id != 0) {
newlim.dqb_btime = dq->dq_btime;
newlim.dqb_itime = dq->dq_itime;
}
if (newlim.dqb_bsoftlimit &&
dq->dq_curblocks >= newlim.dqb_bsoftlimit &&
(dq->dq_bsoftlimit == 0 || dq->dq_curblocks < dq->dq_bsoftlimit))
newlim.dqb_btime = time.tv_sec + ump->um_btime[type];
if (newlim.dqb_isoftlimit &&
dq->dq_curinodes >= newlim.dqb_isoftlimit &&
(dq->dq_isoftlimit == 0 || dq->dq_curinodes < dq->dq_isoftlimit))
newlim.dqb_itime = time.tv_sec + ump->um_itime[type];
dq->dq_dqb = newlim;
if (dq->dq_curblocks < dq->dq_bsoftlimit)
dq->dq_flags &= ~DQ_BLKS;
if (dq->dq_curinodes < dq->dq_isoftlimit)
dq->dq_flags &= ~DQ_INODS;
if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
dq->dq_flags |= DQ_FAKE;
else
dq->dq_flags &= ~DQ_FAKE;
dq->dq_flags |= DQ_MOD;
dqrele(NULLVP, dq);
return (0);
}
/*
* Q_SETUSE - set current inode and block usage.
*/
setuse(mp, id, type, addr)
struct mount *mp;
u_long id;
int type;
caddr_t addr;
{
register struct dquot *dq;
struct ufsmount *ump = VFSTOUFS(mp);
struct dquot *ndq;
struct dqblk usage;
int error;
if (error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk)))
return (error);
if (error = dqget(NULLVP, id, ump, type, &ndq))
return (error);
dq = ndq;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+1);
}
/*
* Reset time limit if have a soft limit and were
* previously under it, but are now over it.
*/
if (dq->dq_bsoftlimit && dq->dq_curblocks < dq->dq_bsoftlimit &&
usage.dqb_curblocks >= dq->dq_bsoftlimit)
dq->dq_btime = time.tv_sec + ump->um_btime[type];
if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
usage.dqb_curinodes >= dq->dq_isoftlimit)
dq->dq_itime = time.tv_sec + ump->um_itime[type];
dq->dq_curblocks = usage.dqb_curblocks;
dq->dq_curinodes = usage.dqb_curinodes;
if (dq->dq_curblocks < dq->dq_bsoftlimit)
dq->dq_flags &= ~DQ_BLKS;
if (dq->dq_curinodes < dq->dq_isoftlimit)
dq->dq_flags &= ~DQ_INODS;
dq->dq_flags |= DQ_MOD;
dqrele(NULLVP, dq);
return (0);
}
/*
* Q_SYNC - sync quota files to disk.
*/
qsync(mp)
struct mount *mp;
{
struct ufsmount *ump = VFSTOUFS(mp);
register struct vnode *vp, *nextvp;
register struct dquot *dq;
register int i;
/*
* Check if the mount point has any quotas.
* If not, simply return.
*/
if ((mp->mnt_flag & MNT_MPBUSY) == 0)
panic("qsync: not busy");
for (i = 0; i < MAXQUOTAS; i++)
if (ump->um_quotas[i] != NULLVP)
break;
if (i == MAXQUOTAS)
return (0);
/*
* Search vnodes associated with this mount point,
* synchronizing any modified dquot structures.
*/
again:
for (vp = mp->mnt_mounth; vp; vp = nextvp) {
nextvp = vp->v_mountf;
if (VOP_ISLOCKED(vp))
continue;
if (vget(vp))
goto again;
for (i = 0; i < MAXQUOTAS; i++) {
dq = VTOI(vp)->i_dquot[i];
if (dq != NODQUOT && (dq->dq_flags & DQ_MOD))
dqsync(vp, dq);
}
vput(vp);
if (vp->v_mountf != nextvp || vp->v_mount != mp)
goto again;
}
return (0);
}
/*
* Code pertaining to management of the in-core dquot data structures.
*/
/*
* Dquot cache - hash chain headers.
*/
union dqhead {
union dqhead *dqh_head[2];
struct dquot *dqh_chain[2];
};
#define dqh_forw dqh_chain[0]
#define dqh_back dqh_chain[1]
union dqhead *dqhashtbl;
long dqhash;
/*
* Dquot free list.
*/
#define DQUOTINC 5 /* minimum free dquots desired */
struct dquot *dqfreel, **dqback = &dqfreel;
long numdquot, desireddquot = DQUOTINC;
/*
* Initialize the quota system.
*/
dqinit()
{
register union dqhead *dhp;
register long dqhashsize;
dqhashsize = roundup((desiredvnodes + 1) * sizeof *dhp / 2,
NBPG * CLSIZE);
dqhashtbl = (union dqhead *)malloc(dqhashsize, M_DQUOT, M_WAITOK);
for (dqhash = 1; dqhash <= dqhashsize / sizeof *dhp; dqhash <<= 1)
/* void */;
dqhash = (dqhash >> 1) - 1;
for (dhp = &dqhashtbl[dqhash]; dhp >= dqhashtbl; dhp--) {
dhp->dqh_head[0] = dhp;
dhp->dqh_head[1] = dhp;
}
}
/*
* Obtain a dquot structure for the specified identifier and quota file
* reading the information from the file if necessary.
*/
dqget(vp, id, ump, type, dqp)
struct vnode *vp;
u_long id;
register struct ufsmount *ump;
register int type;
struct dquot **dqp;
{
register struct dquot *dq;
register union dqhead *dh;
register struct dquot *dp;
register struct vnode *dqvp;
struct iovec aiov;
struct uio auio;
int error;
dqvp = ump->um_quotas[type];
if (dqvp == NULLVP || (ump->um_qflags[type] & QTF_CLOSING)) {
*dqp = NODQUOT;
return (EINVAL);
}
/*
* Check the cache first.
*/
dh = &dqhashtbl[((((int)(dqvp)) >> 8) + id) & dqhash];
for (dq = dh->dqh_forw; dq != (struct dquot *)dh; dq = dq->dq_forw) {
if (dq->dq_id != id ||
dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
continue;
/*
* Cache hit with no references. Take
* the structure off the free list.
*/
if (dq->dq_cnt == 0) {
dp = dq->dq_freef;
if (dp != NODQUOT)
dp->dq_freeb = dq->dq_freeb;
else
dqback = dq->dq_freeb;
*dq->dq_freeb = dp;
}
DQREF(dq);
*dqp = dq;
return (0);
}
/*
* Not in cache, allocate a new one.
*/
if (dqfreel == NODQUOT && numdquot < MAXQUOTAS * desiredvnodes)
desireddquot += DQUOTINC;
if (numdquot < desireddquot) {
dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT, M_WAITOK);
bzero((char *)dq, sizeof *dq);
numdquot++;
} else {
if ((dq = dqfreel) == NULL) {
tablefull("dquot");
*dqp = NODQUOT;
return (EUSERS);
}
if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
panic("free dquot isn't");
if ((dp = dq->dq_freef) != NODQUOT)
dp->dq_freeb = &dqfreel;
else
dqback = &dqfreel;
dqfreel = dp;
dq->dq_freef = NULL;
dq->dq_freeb = NULL;
remque(dq);
}
/*
* Initialize the contents of the dquot structure.
*/
if (vp != dqvp)
VOP_LOCK(dqvp);
insque(dq, dh);
DQREF(dq);
dq->dq_flags = DQ_LOCK;
dq->dq_id = id;
dq->dq_ump = ump;
dq->dq_type = type;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
aiov.iov_base = (caddr_t)&dq->dq_dqb;
aiov.iov_len = sizeof (struct dqblk);
auio.uio_resid = sizeof (struct dqblk);
auio.uio_offset = (off_t)(id * sizeof (struct dqblk));
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_procp = (struct proc *)0;
error = VOP_READ(dqvp, &auio, 0, ump->um_cred[type]);
if (auio.uio_resid == sizeof(struct dqblk) && error == 0)
bzero((caddr_t)&dq->dq_dqb, sizeof(struct dqblk));
if (vp != dqvp)
VOP_UNLOCK(dqvp);
if (dq->dq_flags & DQ_WANT)
wakeup((caddr_t)dq);
dq->dq_flags = 0;
/*
* I/O error in reading quota file, release
* quota structure and reflect problem to caller.
*/
if (error) {
remque(dq);
dq->dq_forw = dq; /* on a private, unfindable hash list */
dq->dq_back = dq;
dqrele(vp, dq);
*dqp = NODQUOT;
return (error);
}
/*
* Check for no limit to enforce.
* Initialize time values if necessary.
*/
if (dq->dq_isoftlimit == 0 && dq->dq_bsoftlimit == 0 &&
dq->dq_ihardlimit == 0 && dq->dq_bhardlimit == 0)
dq->dq_flags |= DQ_FAKE;
if (dq->dq_id != 0) {
if (dq->dq_btime == 0)
dq->dq_btime = time.tv_sec + ump->um_btime[type];
if (dq->dq_itime == 0)
dq->dq_itime = time.tv_sec + ump->um_itime[type];
}
*dqp = dq;
return (0);
}
/*
* Obtain a reference to a dquot.
*/
dqref(dq)
struct dquot *dq;
{
dq->dq_cnt++;
}
/*
* Release a reference to a dquot.
*/
dqrele(vp, dq)
struct vnode *vp;
register struct dquot *dq;
{
if (dq == NODQUOT)
return;
if (dq->dq_cnt > 1) {
dq->dq_cnt--;
return;
}
if (dq->dq_flags & DQ_MOD)
(void) dqsync(vp, dq);
if (--dq->dq_cnt > 0)
return;
if (dqfreel != NODQUOT) {
*dqback = dq;
dq->dq_freeb = dqback;
} else {
dqfreel = dq;
dq->dq_freeb = &dqfreel;
}
dq->dq_freef = NODQUOT;
dqback = &dq->dq_freef;
}
/*
* Update the disk quota in the quota file.
*/
dqsync(vp, dq)
struct vnode *vp;
register struct dquot *dq;
{
struct vnode *dqvp;
struct iovec aiov;
struct uio auio;
int error;
if (dq == NODQUOT)
panic("dqsync: dquot");
if ((dq->dq_flags & DQ_MOD) == 0)
return (0);
if ((dqvp = dq->dq_ump->um_quotas[dq->dq_type]) == NULLVP)
panic("dqsync: file");
if (vp != dqvp)
VOP_LOCK(dqvp);
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
sleep((caddr_t)dq, PINOD+2);
if ((dq->dq_flags & DQ_MOD) == 0) {
if (vp != dqvp)
VOP_UNLOCK(dqvp);
return (0);
}
}
dq->dq_flags |= DQ_LOCK;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
aiov.iov_base = (caddr_t)&dq->dq_dqb;
aiov.iov_len = sizeof (struct dqblk);
auio.uio_resid = sizeof (struct dqblk);
auio.uio_offset = (off_t)(dq->dq_id * sizeof (struct dqblk));
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_procp = (struct proc *)0;
error = VOP_WRITE(dqvp, &auio, 0, dq->dq_ump->um_cred[dq->dq_type]);
if (auio.uio_resid && error == 0)
error = EIO;
if (dq->dq_flags & DQ_WANT)
wakeup((caddr_t)dq);
dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
if (vp != dqvp)
VOP_UNLOCK(dqvp);
return (error);
}
/*
* Flush all entries from the cache for a particular vnode.
*/
dqflush(vp)
register struct vnode *vp;
{
register union dqhead *dh;
register struct dquot *dq, *nextdq;
/*
* Move all dquot's that used to refer to this quota
* file off their hash chains (they will eventually
* fall off the head of the free list and be re-used).
*/
for (dh = &dqhashtbl[dqhash]; dh >= dqhashtbl; dh--) {
for (dq = dh->dqh_forw; dq != (struct dquot *)dh; dq = nextdq) {
nextdq = dq->dq_forw;
if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
continue;
if (dq->dq_cnt)
panic("dqflush: stray dquot");
remque(dq);
dq->dq_forw = dq;
dq->dq_back = dq;
dq->dq_ump = (struct ufsmount *)0;
}
}
}
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