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freebsd-dev/sys/ufs/ufs/ufs_quota.c
Warner Losh 60727d8b86 /* -> /*- for license, minor formatting changes
2005-01-07 02:29:27 +00:00

1042 lines
25 KiB
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/*-
* Copyright (c) 1982, 1986, 1990, 1993, 1995
* The 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.
* 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.
*
* @(#)ufs_quota.c 8.5 (Berkeley) 5/20/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
SYSCTL_DECL(_security_bsd);
static int unprivileged_get_quota = 0;
SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_get_quota, CTLFLAG_RW,
&unprivileged_get_quota, 0,
"Unprivileged processes may retrieve quotas for other uids and gids");
static MALLOC_DEFINE(M_DQUOT, "UFS quota", "UFS quota entries");
/*
* Quota name to error message mapping.
*/
static char *quotatypes[] = INITQFNAMES;
static int chkdqchg(struct inode *, ufs2_daddr_t, struct ucred *, int);
static int chkiqchg(struct inode *, ino_t, struct ucred *, int);
static int dqget(struct vnode *,
u_long, struct ufsmount *, int, struct dquot **);
static int dqsync(struct vnode *, struct dquot *);
static void dqflush(struct vnode *);
#ifdef DIAGNOSTIC
static void dqref(struct dquot *);
static void chkdquot(struct inode *);
#endif
/*
* 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.
*/
int
getinoquota(ip)
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.
*/
int
chkdq(ip, change, cred, flags)
struct inode *ip;
ufs2_daddr_t change;
struct ucred *cred;
int flags;
{
struct dquot *dq;
ufs2_daddr_t ncurblocks;
int i, 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;
(void) tsleep(dq, PINOD+1, "chkdq1", 0);
}
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 && suser_cred(cred, 0)) {
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
error = chkdqchg(ip, change, cred, i);
if (error)
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;
(void) tsleep(dq, PINOD+1, "chkdq2", 0);
}
/* Reset timer when crossing soft limit */
if (dq->dq_curblocks + change >= dq->dq_bsoftlimit &&
dq->dq_curblocks < dq->dq_bsoftlimit)
dq->dq_btime = time_second +
VFSTOUFS(ITOV(ip)->v_mount)->um_btime[i];
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.
*/
static int
chkdqchg(ip, change, cred, type)
struct inode *ip;
ufs2_daddr_t change;
struct ucred *cred;
int type;
{
struct dquot *dq = ip->i_dquot[type];
ufs2_daddr_t 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",
ITOV(ip)->v_mount->mnt_stat.f_mntonname,
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_second +
VFSTOUFS(ITOV(ip)->v_mount)->um_btime[type];
if (ip->i_uid == cred->cr_uid)
uprintf("\n%s: warning, %s %s\n",
ITOV(ip)->v_mount->mnt_stat.f_mntonname,
quotatypes[type], "disk quota exceeded");
return (0);
}
if (time_second > dq->dq_btime) {
if ((dq->dq_flags & DQ_BLKS) == 0 &&
ip->i_uid == cred->cr_uid) {
uprintf("\n%s: write failed, %s %s\n",
ITOV(ip)->v_mount->mnt_stat.f_mntonname,
quotatypes[type],
"disk quota exceeded for too long");
dq->dq_flags |= DQ_BLKS;
}
return (EDQUOT);
}
}
return (0);
}
/*
* Check the inode limit, applying corrective action.
*/
int
chkiq(ip, change, cred, flags)
struct inode *ip;
ino_t change;
struct ucred *cred;
int flags;
{
struct dquot *dq;
ino_t ncurinodes;
int i, error;
#ifdef DIAGNOSTIC
if ((flags & CHOWN) == 0)
chkdquot(ip);
#endif
if (change == 0)
return (0);
/* XXX: change is unsigned */
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;
(void) tsleep(dq, PINOD+1, "chkiq1", 0);
}
ncurinodes = dq->dq_curinodes + change;
/* XXX: ncurinodes is unsigned */
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 && suser_cred(cred, 0)) {
for (i = 0; i < MAXQUOTAS; i++) {
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
error = chkiqchg(ip, change, cred, i);
if (error)
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;
(void) tsleep(dq, PINOD+1, "chkiq2", 0);
}
/* Reset timer when crossing soft limit */
if (dq->dq_curinodes + change >= dq->dq_isoftlimit &&
dq->dq_curinodes < dq->dq_isoftlimit)
dq->dq_itime = time_second +
VFSTOUFS(ITOV(ip)->v_mount)->um_itime[i];
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.
*/
static int
chkiqchg(ip, change, cred, type)
struct inode *ip;
ino_t change;
struct ucred *cred;
int type;
{
struct dquot *dq = ip->i_dquot[type];
ino_t 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",
ITOV(ip)->v_mount->mnt_stat.f_mntonname,
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_second +
VFSTOUFS(ITOV(ip)->v_mount)->um_itime[type];
if (ip->i_uid == cred->cr_uid)
uprintf("\n%s: warning, %s %s\n",
ITOV(ip)->v_mount->mnt_stat.f_mntonname,
quotatypes[type], "inode quota exceeded");
return (0);
}
if (time_second > dq->dq_itime) {
if ((dq->dq_flags & DQ_INODS) == 0 &&
ip->i_uid == cred->cr_uid) {
uprintf("\n%s: write failed, %s %s\n",
ITOV(ip)->v_mount->mnt_stat.f_mntonname,
quotatypes[type],
"inode quota exceeded for 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.
*/
static void
chkdquot(ip)
struct inode *ip;
{
struct ufsmount *ump = VFSTOUFS(ITOV(ip)->v_mount);
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("chkdquot: missing dquot");
}
}
}
#endif
/*
* Code to process quotactl commands.
*/
/*
* Q_QUOTAON - set up a quota file for a particular filesystem.
*/
int
quotaon(td, mp, type, fname)
struct thread *td;
struct mount *mp;
int type;
caddr_t fname;
{
struct ufsmount *ump = VFSTOUFS(mp);
struct vnode *vp, **vpp;
struct vnode *nvp;
struct dquot *dq;
int error, flags;
struct nameidata nd;
error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL);
if (error)
return (error);
vpp = &ump->um_quotas[type];
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, td);
flags = FREAD | FWRITE;
error = vn_open(&nd, &flags, 0, -1);
if (error)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
vp = nd.ni_vp;
VOP_UNLOCK(vp, 0, td);
if (vp->v_type != VREG) {
(void) vn_close(vp, FREAD|FWRITE, td->td_ucred, td);
return (EACCES);
}
if (*vpp != vp)
quotaoff(td, mp, type);
ump->um_qflags[type] |= QTF_OPENING;
mp->mnt_flag |= MNT_QUOTA;
ASSERT_VOP_LOCKED(vp, "quotaon");
vp->v_vflag |= VV_SYSTEM;
*vpp = vp;
/*
* Save the credential of the process that turned on quotas.
* Set up the time limits for this quota.
*/
ump->um_cred[type] = crhold(td->td_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.
*/
MNT_ILOCK(mp);
again:
MNT_VNODE_FOREACH(vp, mp, nvp) {
VI_LOCK(vp);
MNT_IUNLOCK(mp);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
MNT_ILOCK(mp);
goto again;
}
if (vp->v_type == VNON || vp->v_writecount == 0) {
VOP_UNLOCK(vp, 0, td);
vrele(vp);
MNT_ILOCK(mp);
continue;
}
error = getinoquota(VTOI(vp));
VOP_UNLOCK(vp, 0, td);
vrele(vp);
MNT_ILOCK(mp);
if (error)
break;
}
MNT_IUNLOCK(mp);
ump->um_qflags[type] &= ~QTF_OPENING;
if (error)
quotaoff(td, mp, type);
return (error);
}
/*
* Q_QUOTAOFF - turn off disk quotas for a filesystem.
*/
int
quotaoff(td, mp, type)
struct thread *td;
struct mount *mp;
int type;
{
struct vnode *vp;
struct vnode *qvp, *nvp;
struct ufsmount *ump = VFSTOUFS(mp);
struct dquot *dq;
struct inode *ip;
int error;
error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL);
if (error)
return (error);
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.
*/
MNT_ILOCK(mp);
again:
MNT_VNODE_FOREACH(vp, mp, nvp) {
VI_LOCK(vp);
MNT_IUNLOCK(mp);
if (vp->v_type == VNON) {
VI_UNLOCK(vp);
MNT_ILOCK(mp);
continue;
}
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
MNT_ILOCK(mp);
goto again;
}
ip = VTOI(vp);
dq = ip->i_dquot[type];
ip->i_dquot[type] = NODQUOT;
dqrele(vp, dq);
VOP_UNLOCK(vp, 0, td);
vrele(vp);
MNT_ILOCK(mp);
}
MNT_IUNLOCK(mp);
dqflush(qvp);
ASSERT_VOP_LOCKED(qvp, "quotaoff");
qvp->v_vflag &= ~VV_SYSTEM;
error = vn_close(qvp, FREAD|FWRITE, td->td_ucred, td);
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.
*/
int
getquota(td, mp, id, type, addr)
struct thread *td;
struct mount *mp;
u_long id;
int type;
caddr_t addr;
{
struct dquot *dq;
int error;
switch (type) {
case USRQUOTA:
if ((td->td_ucred->cr_uid != id) && !unprivileged_get_quota) {
error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL);
if (error)
return (error);
}
break;
case GRPQUOTA:
if (!groupmember(id, td->td_ucred) && !unprivileged_get_quota) {
error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL);
if (error)
return (error);
}
break;
default:
return (EINVAL);
}
error = dqget(NULLVP, id, VFSTOUFS(mp), type, &dq);
if (error)
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.
*/
int
setquota(td, mp, id, type, addr)
struct thread *td;
struct mount *mp;
u_long id;
int type;
caddr_t addr;
{
struct dquot *dq;
struct dquot *ndq;
struct ufsmount *ump = VFSTOUFS(mp);
struct dqblk newlim;
int error;
error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL);
if (error)
return (error);
error = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk));
if (error)
return (error);
error = dqget(NULLVP, id, ump, type, &ndq);
if (error)
return (error);
dq = ndq;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "setqta", 0);
}
/*
* 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_second + 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_second + 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.
*/
int
setuse(td, mp, id, type, addr)
struct thread *td;
struct mount *mp;
u_long id;
int type;
caddr_t addr;
{
struct dquot *dq;
struct ufsmount *ump = VFSTOUFS(mp);
struct dquot *ndq;
struct dqblk usage;
int error;
error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL);
if (error)
return (error);
error = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk));
if (error)
return (error);
error = dqget(NULLVP, id, ump, type, &ndq);
if (error)
return (error);
dq = ndq;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "setuse", 0);
}
/*
* 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_second + ump->um_btime[type];
if (dq->dq_isoftlimit && dq->dq_curinodes < dq->dq_isoftlimit &&
usage.dqb_curinodes >= dq->dq_isoftlimit)
dq->dq_itime = time_second + 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.
*/
int
qsync(mp)
struct mount *mp;
{
struct ufsmount *ump = VFSTOUFS(mp);
struct thread *td = curthread; /* XXX */
struct vnode *vp, *nvp;
struct dquot *dq;
int i, error;
/*
* Check if the mount point has any quotas.
* If not, simply return.
*/
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.
*/
MNT_ILOCK(mp);
again:
MNT_VNODE_FOREACH(vp, mp, nvp) {
VI_LOCK(vp);
MNT_IUNLOCK(mp);
if (vp->v_type == VNON) {
VI_UNLOCK(vp);
MNT_ILOCK(mp);
continue;
}
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
if (error) {
MNT_ILOCK(mp);
if (error == ENOENT)
goto again;
continue;
}
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);
MNT_ILOCK(mp);
}
MNT_IUNLOCK(mp);
return (0);
}
/*
* Code pertaining to management of the in-core dquot data structures.
*/
#define DQHASH(dqvp, id) \
(&dqhashtbl[((((intptr_t)(dqvp)) >> 8) + id) & dqhash])
static LIST_HEAD(dqhash, dquot) *dqhashtbl;
static u_long dqhash;
/*
* Dquot free list.
*/
#define DQUOTINC 5 /* minimum free dquots desired */
static TAILQ_HEAD(dqfreelist, dquot) dqfreelist;
static long numdquot, desireddquot = DQUOTINC;
/*
* Initialize the quota system.
*/
void
dqinit()
{
dqhashtbl = hashinit(desiredvnodes, M_DQUOT, &dqhash);
TAILQ_INIT(&dqfreelist);
}
/*
* Shut down the quota system.
*/
void
dquninit()
{
struct dquot *dq;
hashdestroy(dqhashtbl, M_DQUOT, dqhash);
while ((dq = TAILQ_FIRST(&dqfreelist)) != NULL) {
TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
free(dq, M_DQUOT);
}
}
/*
* Obtain a dquot structure for the specified identifier and quota file
* reading the information from the file if necessary.
*/
static int
dqget(vp, id, ump, type, dqp)
struct vnode *vp;
u_long id;
struct ufsmount *ump;
int type;
struct dquot **dqp;
{
struct thread *td = curthread; /* XXX */
struct dquot *dq;
struct dqhash *dqh;
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.
*/
dqh = DQHASH(dqvp, id);
LIST_FOREACH(dq, dqh, dq_hash) {
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)
TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
DQREF(dq);
*dqp = dq;
return (0);
}
/*
* Not in cache, allocate a new one.
*/
if (TAILQ_FIRST(&dqfreelist) == NODQUOT &&
numdquot < MAXQUOTAS * desiredvnodes)
desireddquot += DQUOTINC;
if (numdquot < desireddquot) {
dq = (struct dquot *)malloc(sizeof *dq, M_DQUOT,
M_WAITOK | M_ZERO);
numdquot++;
} else {
if ((dq = TAILQ_FIRST(&dqfreelist)) == NULL) {
tablefull("dquot");
*dqp = NODQUOT;
return (EUSERS);
}
if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
panic("dqget: free dquot isn't");
TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
if (dq->dq_ump != NULL)
LIST_REMOVE(dq, dq_hash);
}
/*
* Initialize the contents of the dquot structure.
*/
if (vp != dqvp)
vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, td);
LIST_INSERT_HEAD(dqh, dq, dq_hash);
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_td = (struct thread *)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, 0, td);
if (dq->dq_flags & DQ_WANT)
wakeup(dq);
dq->dq_flags = 0;
/*
* I/O error in reading quota file, release
* quota structure and reflect problem to caller.
*/
if (error) {
LIST_REMOVE(dq, dq_hash);
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_second + ump->um_btime[type];
if (dq->dq_itime == 0)
dq->dq_itime = time_second + ump->um_itime[type];
}
*dqp = dq;
return (0);
}
#ifdef DIAGNOSTIC
/*
* Obtain a reference to a dquot.
*/
static void
dqref(dq)
struct dquot *dq;
{
dq->dq_cnt++;
}
#endif
/*
* Release a reference to a dquot.
*/
void
dqrele(vp, dq)
struct vnode *vp;
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;
TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist);
}
/*
* Update the disk quota in the quota file.
*/
static int
dqsync(vp, dq)
struct vnode *vp;
struct dquot *dq;
{
struct thread *td = curthread; /* XXX */
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");
(void) vn_write_suspend_wait(dqvp, NULL, V_WAIT);
if (vp != dqvp)
vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, td);
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+2, "dqsync", 0);
if ((dq->dq_flags & DQ_MOD) == 0) {
if (vp != dqvp)
VOP_UNLOCK(dqvp, 0, td);
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_td = (struct thread *)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(dq);
dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
if (vp != dqvp)
VOP_UNLOCK(dqvp, 0, td);
return (error);
}
/*
* Flush all entries from the cache for a particular vnode.
*/
static void
dqflush(vp)
struct vnode *vp;
{
struct dquot *dq, *nextdq;
struct dqhash *dqh;
/*
* 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 (dqh = &dqhashtbl[dqhash]; dqh >= dqhashtbl; dqh--) {
for (dq = LIST_FIRST(dqh); dq; dq = nextdq) {
nextdq = LIST_NEXT(dq, dq_hash);
if (dq->dq_ump->um_quotas[dq->dq_type] != vp)
continue;
if (dq->dq_cnt)
panic("dqflush: stray dquot");
LIST_REMOVE(dq, dq_hash);
dq->dq_ump = (struct ufsmount *)0;
}
}
}
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