/* $OpenBSD: ufs_quota.c,v 1.28 2007/08/03 18:41:44 millert Exp $ */
/* $NetBSD: ufs_quota.c,v 1.8 1996/02/09 22:36:09 christos Exp $ */
/*
* 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.
* 3. 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) 8/19/94
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <sys/queue.h>
/*
* The following structure records disk usage for a user or group on a
* filesystem. There is one allocated for each quota that exists on any
* filesystem for the current user or group. A cache is kept of recently
* used entries.
*/
struct dquot {
LIST_ENTRY(dquot) dq_hash; /* hash list */
TAILQ_ENTRY(dquot) dq_freelist; /* free list */
u_int16_t dq_flags; /* flags, see below */
u_int16_t dq_type; /* quota type of this dquot */
u_int32_t dq_cnt; /* count of active references */
u_int32_t dq_id; /* identifier this applies to */
struct vnode *dq_vp; /* file backing this quota */
struct ucred *dq_cred; /* credentials for writing file */
struct dqblk dq_dqb; /* actual usage & quotas */
};
/*
* Flag values.
*/
#define DQ_LOCK 0x01 /* this quota locked (no MODS) */
#define DQ_WANT 0x02 /* wakeup on unlock */
#define DQ_MOD 0x04 /* this quota modified since read */
#define DQ_FAKE 0x08 /* no limits here, just usage */
#define DQ_BLKS 0x10 /* has been warned about blk limit */
#define DQ_INODS 0x20 /* has been warned about inode limit */
/*
* Shorthand notation.
*/
#define dq_bhardlimit dq_dqb.dqb_bhardlimit
#define dq_bsoftlimit dq_dqb.dqb_bsoftlimit
#define dq_curblocks dq_dqb.dqb_curblocks
#define dq_ihardlimit dq_dqb.dqb_ihardlimit
#define dq_isoftlimit dq_dqb.dqb_isoftlimit
#define dq_curinodes dq_dqb.dqb_curinodes
#define dq_btime dq_dqb.dqb_btime
#define dq_itime dq_dqb.dqb_itime
/*
* If the system has never checked for a quota for this file, then it is
* set to NODQUOT. Once a write attempt is made the inode pointer is set
* to reference a dquot structure.
*/
#define NODQUOT NULL
void dqref(struct dquot *);
void dqrele(struct vnode *, struct dquot *);
int dqsync(struct vnode *, struct dquot *);
#ifdef DIAGNOSTIC
void chkdquot(struct inode *);
#endif
int getquota(struct mount *, u_long, int, caddr_t);
int quotaon(struct proc *, struct mount *, int, caddr_t);
int setquota(struct mount *, u_long, int, caddr_t);
int setuse(struct mount *, u_long, int, caddr_t);
int chkdqchg(struct inode *, long, struct ucred *, int);
int chkiqchg(struct inode *, long, struct ucred *, int);
int dqget(struct vnode *, u_long, struct ufsmount *, int,
struct dquot **);
int quotaon_vnode(struct vnode *, void *);
int quotaoff_vnode(struct vnode *, void *);
int qsync_vnode(struct vnode *, void *);
/*
* Quota name to error message mapping.
*/
static char *quotatypes[] = INITQFNAMES;
/*
* Obtain a reference to a dquot.
*/
void
dqref(struct dquot *dq)
{
dq->dq_cnt++;
}
/*
* 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(struct inode *ip)
{
struct ufsmount *ump;
struct vnode *vp = ITOV(ip);
int error;
ump = ip->i_ump;
/*
* 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, DIP(ip, 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, DIP(ip, gid), ump, GRPQUOTA, &ip->i_dquot[GRPQUOTA])) &&
error != EINVAL)
return (error);
return (0);
}
/*
* Update disk usage, and take corrective action.
*/
int
ufs_quota_alloc_blocks2(struct inode *ip, int32_t change,
struct ucred *cred, enum ufs_quota_flags flags)
{
struct dquot *dq;
int i;
int error;
#ifdef DIAGNOSTIC
chkdquot(ip);
#endif
if (change == 0)
return (0);
if ((flags & UFS_QUOTA_FORCE) == 0 &&
(cred != NOCRED && cred->cr_uid != 0)) {
for (i = 0; i < MAXQUOTAS; i++) {
if (flags & (1 << i))
continue;
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
if ((error = chkdqchg(ip, change, cred, i)) != 0)
return (error);
}
}
for (i = 0; i < MAXQUOTAS; i++) {
if (flags & (1 << i))
continue;
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "chkdq", 0);
}
dq->dq_curblocks += change;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
int
ufs_quota_free_blocks2(struct inode *ip, int32_t change,
struct ucred *cred, enum ufs_quota_flags flags)
{
struct dquot *dq;
int i;
#ifdef DIAGNOSTIC
if (!VOP_ISLOCKED(ITOV(ip)))
panic ("ufs_quota_free_blocks2: vnode is not locked");
#endif
if (change == 0)
return (0);
for (i = 0; i < MAXQUOTAS; i++) {
if (flags & (1 << i))
continue;
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "chkdq", 0);
}
if (dq->dq_curblocks >= change)
dq->dq_curblocks -= change;
else
dq->dq_curblocks = 0;
dq->dq_flags &= ~DQ_BLKS;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
/*
* Check for a valid change to a users allocation.
* Issue an error message if appropriate.
*/
int
chkdqchg(struct inode *ip, long change, struct ucred *cred, int type)
{
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 &&
DIP(ip, 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 +
ip->i_ump->um_btime[type];
if (DIP(ip, 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 &&
DIP(ip, 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
ufs_quota_alloc_inode2(struct inode *ip, struct ucred *cred,
enum ufs_quota_flags flags)
{
struct dquot *dq;
int i;
int error;
#ifdef DIAGNOSTIC
chkdquot(ip);
#endif
if ((flags & UFS_QUOTA_FORCE) == 0 && cred->cr_uid != 0) {
for (i = 0; i < MAXQUOTAS; i++) {
if (flags & (1 << i))
continue;
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
if ((error = chkiqchg(ip, 1, cred, i)) != 0)
return (error);
}
}
for (i = 0; i < MAXQUOTAS; i++) {
if (flags & (1 << i))
continue;
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "chkiq", 0);
}
dq->dq_curinodes++;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
int
ufs_quota_free_inode2(struct inode *ip, struct ucred *cred,
enum ufs_quota_flags flags)
{
struct dquot *dq;
int i;
#ifdef DIAGNOSTIC
if (!VOP_ISLOCKED(ITOV(ip)))
panic ("ufs_quota_free_blocks2: vnode is not locked");
#endif
for (i = 0; i < MAXQUOTAS; i++) {
if (flags & (1 << i))
continue;
if ((dq = ip->i_dquot[i]) == NODQUOT)
continue;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "chkiq", 0);
}
if (dq->dq_curinodes > 0)
dq->dq_curinodes--;
dq->dq_flags &= ~DQ_INODS;
dq->dq_flags |= DQ_MOD;
}
return (0);
}
/*
* Check for a valid change to a users allocation.
* Issue an error message if appropriate.
*/
int
chkiqchg(struct inode *ip, long change, struct ucred *cred, int type)
{
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 &&
DIP(ip, 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 +
ip->i_ump->um_itime[type];
if (DIP(ip, 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 &&
DIP(ip, 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.
*/
void
chkdquot(struct inode *ip)
{
struct ufsmount *ump = ip->i_ump;
int i;
struct vnode *vp = ITOV(ip);
if (!VOP_ISLOCKED(vp))
panic ("chkdquot: vnode is not locked");
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
/*
* Code to process quotactl commands.
*/
int
quotaon_vnode(struct vnode *vp, void *arg)
{
int error;
struct proc *p = (struct proc *)arg;
if (vp->v_type == VNON || vp->v_writecount == 0)
return (0);
if (vget(vp, LK_EXCLUSIVE, p)) {
return (0);
}
error = getinoquota(VTOI(vp));
vput(vp);
return (error);
}
/*
* Q_QUOTAON - set up a quota file for a particular file system.
*/
int
quotaon(struct proc *p, struct mount *mp, int type, caddr_t fname)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct vnode *vp, **vpp;
struct dquot *dq;
int error;
struct nameidata nd;
#ifdef DIAGNOSTIC
if (!vfs_isbusy(mp))
panic ("quotaon: mount point not busy");
#endif
vpp = &ump->um_quotas[type];
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p);
if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0)
return (error);
vp = nd.ni_vp;
VOP_UNLOCK(vp, 0, p);
if (vp->v_type != VREG) {
(void) vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
return (EACCES);
}
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.
*/
error = vfs_mount_foreach_vnode(mp, quotaon_vnode, p);
ump->um_qflags[type] &= ~QTF_OPENING;
if (error)
quotaoff(p, mp, type);
return (error);
}
struct quotaoff_arg {
struct proc *p;
int type;
};
int
quotaoff_vnode(struct vnode *vp, void *arg)
{
struct quotaoff_arg *qa = (struct quotaoff_arg *)arg;
struct inode *ip;
struct dquot *dq;
if (vp->v_type == VNON)
return (0);
if (vget(vp, LK_EXCLUSIVE, qa->p))
return (0);
ip = VTOI(vp);
dq = ip->i_dquot[qa->type];
ip->i_dquot[qa->type] = NODQUOT;
dqrele(vp, dq);
vput(vp);
return (0);
}
/*
* Q_QUOTAOFF - turn off disk quotas for a filesystem.
*/
int
quotaoff(struct proc *p, struct mount *mp, int type)
{
struct vnode *qvp;
struct ufsmount *ump = VFSTOUFS(mp);
struct quotaoff_arg qa;
int error;
#ifdef DIAGNOSTIC
if (!vfs_isbusy(mp))
panic ("quotaoff: mount point not busy");
#endif
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.
*/
qa.p = p;
qa.type = type;
vfs_mount_foreach_vnode(mp, quotaoff_vnode, &qa);
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.
*/
int
getquota(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)) != 0)
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(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 = copyin(addr, (caddr_t)&newlim, sizeof (struct dqblk));
if (error)
return (error);
if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0)
return (error);
dq = ndq;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_WANT;
(void) tsleep(dq, PINOD+1, "setquota", 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(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 = copyin(addr, (caddr_t)&usage, sizeof (struct dqblk));
if (error)
return (error);
if ((error = dqget(NULLVP, id, ump, type, &ndq)) != 0)
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);
}
int
qsync_vnode(struct vnode *vp, void *arg)
{
int i;
struct proc *p = curproc;
struct dquot *dq;
if (vp->v_type == VNON)
return (0);
if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT, p))
return (0);
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);
return (0);
}
/*
* Q_SYNC - sync quota files to disk.
*/
int
qsync(struct mount *mp)
{
struct ufsmount *ump = VFSTOUFS(mp);
int i;
/*
* 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.
*/
vfs_mount_foreach_vnode(mp, qsync_vnode, NULL);
return (0);
}
/*
* Code pertaining to management of the in-core dquot data structures.
*/
#define DQHASH(dqvp, id) \
(&dqhashtbl[((((long)(dqvp)) >> 8) + id) & dqhash])
LIST_HEAD(dqhash, dquot) *dqhashtbl;
u_long dqhash;
/*
* Dquot free list.
*/
#define DQUOTINC 5 /* minimum free dquots desired */
TAILQ_HEAD(dqfreelist, dquot) dqfreelist;
long numdquot, desireddquot = DQUOTINC;
/*
* Initialize the quota system.
*/
void
ufs_quota_init(void)
{
dqhashtbl = hashinit(desiredvnodes, M_DQUOT, M_WAITOK, &dqhash);
TAILQ_INIT(&dqfreelist);
}
/*
* Obtain a dquot structure for the specified identifier and quota file
* reading the information from the file if necessary.
*/
int
dqget(struct vnode *vp, u_long id, struct ufsmount *ump, int type,
struct dquot **dqp)
{
struct proc *p = curproc;
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_vp != 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);
bzero((char *)dq, sizeof *dq);
numdquot++;
} else {
if ((dq = TAILQ_FIRST(&dqfreelist)) == NULL) {
tablefull("dquot");
*dqp = NODQUOT;
return (EUSERS);
}
if (dq->dq_cnt || (dq->dq_flags & DQ_MOD))
panic("free dquot isn't");
TAILQ_REMOVE(&dqfreelist, dq, dq_freelist);
LIST_REMOVE(dq, dq_hash);
crfree(dq->dq_cred);
dq->dq_cred = NOCRED;
}
/*
* Initialize the contents of the dquot structure.
*/
if (vp != dqvp)
vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, p);
LIST_INSERT_HEAD(dqh, dq, dq_hash);
dqref(dq);
dq->dq_flags = DQ_LOCK;
dq->dq_id = id;
dq->dq_vp = dqvp;
dq->dq_type = type;
crhold(ump->um_cred[type]);
dq->dq_cred = ump->um_cred[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, dq->dq_cred);
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, p);
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);
}
/*
* Release a reference to a dquot.
*/
void
dqrele(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.
*/
int
dqsync(struct vnode *vp, struct dquot *dq)
{
struct proc *p = curproc;
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_vp) == NULLVP)
panic("dqsync: file");
if (vp != dqvp)
vn_lock(dqvp, LK_EXCLUSIVE | LK_RETRY, p);
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, p);
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_cred);
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, p);
return (error);
}
int
ufs_quota_delete(struct inode *ip)
{
struct vnode *vp = ITOV(ip);
int i;
for (i = 0; i < MAXQUOTAS; i++) {
if (ip->i_dquot[i] != NODQUOT) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
}
return (0);
}
/*
* Do operations associated with quotas
*/
int
ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
struct proc *p)
{
int cmd, type, error;
if (uid == -1)
uid = p->p_cred->p_ruid;
cmd = cmds >> SUBCMDSHIFT;
switch (cmd) {
case Q_SYNC:
break;
case Q_GETQUOTA:
if (uid == p->p_cred->p_ruid)
break;
/* FALLTHROUGH */
default:
if ((error = suser(p, 0)) != 0)
return (error);
}
type = cmds & SUBCMDMASK;
if ((u_int)type >= MAXQUOTAS)
return (EINVAL);
if (vfs_busy(mp, VB_READ|VB_NOWAIT))
return (0);
switch (cmd) {
case Q_QUOTAON:
error = quotaon(p, mp, type, arg);
break;
case Q_QUOTAOFF:
error = quotaoff(p, mp, type);
break;
case Q_SETQUOTA:
error = setquota(mp, uid, type, arg) ;
break;
case Q_SETUSE:
error = setuse(mp, uid, type, arg);
break;
case Q_GETQUOTA:
error = getquota(mp, uid, type, arg);
break;
case Q_SYNC:
error = qsync(mp);
break;
default:
error = EINVAL;
break;
}
vfs_unbusy(mp);
return (error);
}
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