minix/sys/ufs/lfs/ulfs_quota.c

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/* $NetBSD: ulfs_quota.c,v 1.10 2013/11/22 02:02:35 dholland Exp $ */
/* from NetBSD: ufs_quota.c,v 1.115 2013/11/16 17:04:53 dholland 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) 5/20/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ulfs_quota.c,v 1.10 2013/11/22 02:02:35 dholland Exp $");
#if defined(_KERNEL_OPT)
#include "opt_quota.h"
#endif
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kauth.h>
#include <sys/quotactl.h>
#include <ufs/lfs/ulfs_quotacommon.h>
#include <ufs/lfs/ulfs_inode.h>
#include <ufs/lfs/ulfsmount.h>
#include <ufs/lfs/ulfs_extern.h>
#include <ufs/lfs/ulfs_quota.h>
kmutex_t lfs_dqlock;
kcondvar_t lfs_dqcv;
const char *lfs_quotatypes[ULFS_MAXQUOTAS] = INITQFNAMES;
/*
* Code pertaining to management of the in-core dquot data structures.
*/
#define DQHASH(dqvp, id) \
(((((long)(dqvp)) >> 8) + id) & dqhash)
static LIST_HEAD(dqhashhead, dquot) *dqhashtbl;
static u_long dqhash;
static pool_cache_t dquot_cache;
static int quota_handle_cmd_stat(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_idtypestat(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_objtypestat(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_get(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_put(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_cursorget(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_delete(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_quotaon(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_quotaoff(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_cursoropen(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_cursorclose(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_cursorskipidtype(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_cursoratend(struct mount *, struct lwp *,
struct quotactl_args *args);
static int quota_handle_cmd_cursorrewind(struct mount *, struct lwp *,
struct quotactl_args *args);
/*
* Initialize the quota fields of an inode.
*/
void
ulfsquota_init(struct inode *ip)
{
int i;
for (i = 0; i < ULFS_MAXQUOTAS; i++)
ip->i_dquot[i] = NODQUOT;
}
/*
* Release the quota fields from an inode.
*/
void
ulfsquota_free(struct inode *ip)
{
int i;
for (i = 0; i < ULFS_MAXQUOTAS; i++) {
lfs_dqrele(ITOV(ip), ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
}
/*
* Update disk usage, and take corrective action.
*/
int
lfs_chkdq(struct inode *ip, int64_t change, kauth_cred_t cred, int flags)
{
/* do not track snapshot usage, or we will deadlock */
if ((ip->i_flags & SF_SNAPSHOT) != 0)
return 0;
#ifdef LFS_QUOTA
if (ip->i_lfs->um_flags & ULFS_QUOTA)
return lfs_chkdq1(ip, change, cred, flags);
#endif
#ifdef LFS_QUOTA2
if (ip->i_lfs->um_flags & ULFS_QUOTA2)
return lfs_chkdq2(ip, change, cred, flags);
#endif
return 0;
}
/*
* Check the inode limit, applying corrective action.
*/
int
lfs_chkiq(struct inode *ip, int32_t change, kauth_cred_t cred, int flags)
{
/* do not track snapshot usage, or we will deadlock */
if ((ip->i_flags & SF_SNAPSHOT) != 0)
return 0;
#ifdef LFS_QUOTA
if (ip->i_lfs->um_flags & ULFS_QUOTA)
return lfs_chkiq1(ip, change, cred, flags);
#endif
#ifdef LFS_QUOTA2
if (ip->i_lfs->um_flags & ULFS_QUOTA2)
return lfs_chkiq2(ip, change, cred, flags);
#endif
return 0;
}
int
lfsquota_handle_cmd(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
int error = 0;
switch (args->qc_op) {
case QUOTACTL_STAT:
error = quota_handle_cmd_stat(mp, l, args);
break;
case QUOTACTL_IDTYPESTAT:
error = quota_handle_cmd_idtypestat(mp, l, args);
break;
case QUOTACTL_OBJTYPESTAT:
error = quota_handle_cmd_objtypestat(mp, l, args);
break;
case QUOTACTL_QUOTAON:
error = quota_handle_cmd_quotaon(mp, l, args);
break;
case QUOTACTL_QUOTAOFF:
error = quota_handle_cmd_quotaoff(mp, l, args);
break;
case QUOTACTL_GET:
error = quota_handle_cmd_get(mp, l, args);
break;
case QUOTACTL_PUT:
error = quota_handle_cmd_put(mp, l, args);
break;
case QUOTACTL_CURSORGET:
error = quota_handle_cmd_cursorget(mp, l, args);
break;
case QUOTACTL_DELETE:
error = quota_handle_cmd_delete(mp, l, args);
break;
case QUOTACTL_CURSOROPEN:
error = quota_handle_cmd_cursoropen(mp, l, args);
break;
case QUOTACTL_CURSORCLOSE:
error = quota_handle_cmd_cursorclose(mp, l, args);
break;
case QUOTACTL_CURSORSKIPIDTYPE:
error = quota_handle_cmd_cursorskipidtype(mp, l, args);
break;
case QUOTACTL_CURSORATEND:
error = quota_handle_cmd_cursoratend(mp, l, args);
break;
case QUOTACTL_CURSORREWIND:
error = quota_handle_cmd_cursorrewind(mp, l, args);
break;
default:
panic("Invalid quotactl operation %d\n", args->qc_op);
}
return error;
}
static int
quota_handle_cmd_stat(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
KASSERT(args->qc_op == QUOTACTL_STAT);
if ((fs->um_flags & (ULFS_QUOTA|ULFS_QUOTA2)) == 0)
return EOPNOTSUPP;
#ifdef LFS_QUOTA
if (fs->um_flags & ULFS_QUOTA) {
struct quotastat *info = args->u.stat.qc_info;
strcpy(info->qs_implname, "lfs quota v1");
info->qs_numidtypes = ULFS_MAXQUOTAS;
/* XXX no define for this */
info->qs_numobjtypes = 2;
info->qs_restrictions = 0;
info->qs_restrictions |= QUOTA_RESTRICT_NEEDSQUOTACHECK;
info->qs_restrictions |= QUOTA_RESTRICT_UNIFORMGRACE;
info->qs_restrictions |= QUOTA_RESTRICT_32BIT;
} else
#endif
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotastat *info = args->u.stat.qc_info;
strcpy(info->qs_implname, "lfs quota v2");
info->qs_numidtypes = ULFS_MAXQUOTAS;
info->qs_numobjtypes = N_QL;
info->qs_restrictions = 0;
} else
#endif
return EOPNOTSUPP;
return 0;
}
static int
quota_handle_cmd_idtypestat(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
int idtype;
struct quotaidtypestat *info;
const char *name;
KASSERT(args->qc_op == QUOTACTL_IDTYPESTAT);
idtype = args->u.idtypestat.qc_idtype;
info = args->u.idtypestat.qc_info;
if ((fs->um_flags & (ULFS_QUOTA|ULFS_QUOTA2)) == 0)
return EOPNOTSUPP;
/*
* These are the same for both QUOTA and QUOTA2.
*/
switch (idtype) {
case QUOTA_IDTYPE_USER:
name = "user";
break;
case QUOTA_IDTYPE_GROUP:
name = "group";
break;
default:
return EINVAL;
}
strlcpy(info->qis_name, name, sizeof(info->qis_name));
return 0;
}
static int
quota_handle_cmd_objtypestat(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
int objtype;
struct quotaobjtypestat *info;
const char *name;
int isbytes;
KASSERT(args->qc_op == QUOTACTL_OBJTYPESTAT);
objtype = args->u.objtypestat.qc_objtype;
info = args->u.objtypestat.qc_info;
if ((fs->um_flags & (ULFS_QUOTA|ULFS_QUOTA2)) == 0)
return EOPNOTSUPP;
/*
* These are the same for both QUOTA and QUOTA2.
*/
switch (objtype) {
case QUOTA_OBJTYPE_BLOCKS:
name = "block";
isbytes = 1;
break;
case QUOTA_OBJTYPE_FILES:
name = "file";
isbytes = 0;
break;
default:
return EINVAL;
}
strlcpy(info->qos_name, name, sizeof(info->qos_name));
info->qos_isbytes = isbytes;
return 0;
}
/* XXX shouldn't all this be in kauth ? */
static int
quota_get_auth(struct mount *mp, struct lwp *l, uid_t id) {
/* The user can always query about his own quota. */
if (id == kauth_cred_geteuid(l->l_cred))
return 0;
return kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, KAUTH_ARG(id), NULL);
}
static int
quota_handle_cmd_get(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
int error;
const struct quotakey *qk;
KASSERT(args->qc_op == QUOTACTL_GET);
qk = args->u.get.qc_key;
if ((fs->um_flags & (ULFS_QUOTA|ULFS_QUOTA2)) == 0)
return EOPNOTSUPP;
error = quota_get_auth(mp, l, qk->qk_id);
if (error != 0)
return error;
#ifdef LFS_QUOTA
if (fs->um_flags & ULFS_QUOTA) {
struct quotaval *qv = args->u.get.qc_val;
error = lfsquota1_handle_cmd_get(ump, qk, qv);
} else
#endif
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotaval *qv = args->u.get.qc_val;
error = lfsquota2_handle_cmd_get(ump, qk, qv);
} else
#endif
panic("quota_handle_cmd_get: no support ?");
if (error != 0)
return error;
return error;
}
static int
quota_handle_cmd_put(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
const struct quotakey *qk;
id_t kauth_id;
int error;
KASSERT(args->qc_op == QUOTACTL_PUT);
qk = args->u.put.qc_key;
if ((fs->um_flags & (ULFS_QUOTA|ULFS_QUOTA2)) == 0)
return EOPNOTSUPP;
kauth_id = qk->qk_id;
if (kauth_id == QUOTA_DEFAULTID) {
kauth_id = 0;
}
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_MANAGE, mp, KAUTH_ARG(kauth_id),
NULL);
if (error != 0) {
return error;
}
#ifdef LFS_QUOTA
if (fs->um_flags & ULFS_QUOTA) {
const struct quotaval *qv = args->u.put.qc_val;
error = lfsquota1_handle_cmd_put(ump, qk, qv);
} else
#endif
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
const struct quotaval *qv = args->u.put.qc_val;
error = lfsquota2_handle_cmd_put(ump, qk, qv);
} else
#endif
panic("quota_handle_cmd_get: no support ?");
if (error == ENOENT) {
error = 0;
}
return error;
}
static int
quota_handle_cmd_delete(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
const struct quotakey *qk;
id_t kauth_id;
int error;
KASSERT(args->qc_op == QUOTACTL_DELETE);
qk = args->u.delete.qc_key;
kauth_id = qk->qk_id;
if (kauth_id == QUOTA_DEFAULTID) {
kauth_id = 0;
}
if ((fs->um_flags & ULFS_QUOTA2) == 0)
return EOPNOTSUPP;
/* avoid whitespace changes */
{
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_MANAGE, mp, KAUTH_ARG(kauth_id),
NULL);
if (error != 0)
goto err;
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
error = lfsquota2_handle_cmd_delete(ump, qk);
} else
#endif
panic("quota_handle_cmd_get: no support ?");
if (error && error != ENOENT)
goto err;
}
return 0;
err:
return error;
}
static int
quota_handle_cmd_cursorget(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
int error;
KASSERT(args->qc_op == QUOTACTL_CURSORGET);
if ((fs->um_flags & ULFS_QUOTA2) == 0)
return EOPNOTSUPP;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, NULL, NULL);
if (error)
return error;
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotakcursor *cursor = args->u.cursorget.qc_cursor;
struct quotakey *keys = args->u.cursorget.qc_keys;
struct quotaval *vals = args->u.cursorget.qc_vals;
unsigned maxnum = args->u.cursorget.qc_maxnum;
unsigned *ret = args->u.cursorget.qc_ret;
error = lfsquota2_handle_cmd_cursorget(ump, cursor, keys, vals,
maxnum, ret);
} else
#endif
panic("quota_handle_cmd_cursorget: no support ?");
return error;
}
static int
quota_handle_cmd_cursoropen(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
#ifdef LFS_QUOTA2
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
struct quotakcursor *cursor;
#endif
int error;
KASSERT(args->qc_op == QUOTACTL_CURSOROPEN);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, NULL, NULL);
if (error)
return error;
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
cursor = args->u.cursoropen.qc_cursor;
error = lfsquota2_handle_cmd_cursoropen(ump, cursor);
} else
#endif
error = EOPNOTSUPP;
return error;
}
static int
quota_handle_cmd_cursorclose(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
#ifdef LFS_QUOTA2
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
#endif
int error;
KASSERT(args->qc_op == QUOTACTL_CURSORCLOSE);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, NULL, NULL);
if (error)
return error;
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotakcursor *cursor = args->u.cursorclose.qc_cursor;
error = lfsquota2_handle_cmd_cursorclose(ump, cursor);
} else
#endif
error = EOPNOTSUPP;
return error;
}
static int
quota_handle_cmd_cursorskipidtype(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
#ifdef LFS_QUOTA2
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
#endif
int error;
KASSERT(args->qc_op == QUOTACTL_CURSORSKIPIDTYPE);
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotakcursor *cursor = args->u.cursorskipidtype.qc_cursor;
int idtype = args->u.cursorskipidtype.qc_idtype;
error = lfsquota2_handle_cmd_cursorskipidtype(ump, cursor, idtype);
} else
#endif
error = EOPNOTSUPP;
return error;
}
static int
quota_handle_cmd_cursoratend(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
#ifdef LFS_QUOTA2
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
#endif
int error;
KASSERT(args->qc_op == QUOTACTL_CURSORATEND);
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotakcursor *cursor = args->u.cursoratend.qc_cursor;
int *ret = args->u.cursoratend.qc_ret;
error = lfsquota2_handle_cmd_cursoratend(ump, cursor, ret);
} else
#endif
error = EOPNOTSUPP;
return error;
}
static int
quota_handle_cmd_cursorrewind(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
#ifdef LFS_QUOTA2
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
#endif
int error;
KASSERT(args->qc_op == QUOTACTL_CURSORREWIND);
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
struct quotakcursor *cursor = args->u.cursorrewind.qc_cursor;
error = lfsquota2_handle_cmd_cursorrewind(ump, cursor);
} else
#endif
error = EOPNOTSUPP;
return error;
}
static int
quota_handle_cmd_quotaon(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
int error;
KASSERT(args->qc_op == QUOTACTL_QUOTAON);
if ((fs->um_flags & ULFS_QUOTA2) != 0)
return EBUSY;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_ONOFF, mp, NULL, NULL);
if (error != 0) {
return error;
}
#ifdef LFS_QUOTA
int idtype = args->u.quotaon.qc_idtype;
const char *qfile = args->u.quotaon.qc_quotafile;
error = lfsquota1_handle_cmd_quotaon(l, ump, idtype, qfile);
#else
error = EOPNOTSUPP;
#endif
return error;
}
static int
quota_handle_cmd_quotaoff(struct mount *mp, struct lwp *l,
struct quotactl_args *args)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
int error;
KASSERT(args->qc_op == QUOTACTL_QUOTAOFF);
if ((fs->um_flags & ULFS_QUOTA2) != 0)
return EOPNOTSUPP;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
KAUTH_REQ_SYSTEM_FS_QUOTA_ONOFF, mp, NULL, NULL);
if (error != 0) {
return error;
}
#ifdef LFS_QUOTA
int idtype = args->u.quotaoff.qc_idtype;
error = lfsquota1_handle_cmd_quotaoff(l, ump, idtype);
#else
error = EOPNOTSUPP;
#endif
return error;
}
/*
* Initialize the quota system.
*/
void
lfs_dqinit(void)
{
mutex_init(&lfs_dqlock, MUTEX_DEFAULT, IPL_NONE);
cv_init(&lfs_dqcv, "quota");
dqhashtbl = hashinit(desiredvnodes, HASH_LIST, true, &dqhash);
dquot_cache = pool_cache_init(sizeof(struct dquot), 0, 0, 0, "lfsdq",
NULL, IPL_NONE, NULL, NULL, NULL);
}
void
lfs_dqreinit(void)
{
struct dquot *dq;
struct dqhashhead *oldhash, *hash;
struct vnode *dqvp;
u_long oldmask, mask, hashval;
int i;
hash = hashinit(desiredvnodes, HASH_LIST, true, &mask);
mutex_enter(&lfs_dqlock);
oldhash = dqhashtbl;
oldmask = dqhash;
dqhashtbl = hash;
dqhash = mask;
for (i = 0; i <= oldmask; i++) {
while ((dq = LIST_FIRST(&oldhash[i])) != NULL) {
dqvp = dq->dq_ump->um_quotas[dq->dq_type];
LIST_REMOVE(dq, dq_hash);
hashval = DQHASH(dqvp, dq->dq_id);
LIST_INSERT_HEAD(&dqhashtbl[hashval], dq, dq_hash);
}
}
mutex_exit(&lfs_dqlock);
hashdone(oldhash, HASH_LIST, oldmask);
}
/*
* Free resources held by quota system.
*/
void
lfs_dqdone(void)
{
pool_cache_destroy(dquot_cache);
hashdone(dqhashtbl, HASH_LIST, dqhash);
cv_destroy(&lfs_dqcv);
mutex_destroy(&lfs_dqlock);
}
/*
* Set up the quotas for an inode.
*
* This routine completely defines the semantics of quotas.
* If other criteria want to be used to establish quotas, the
* ULFS_MAXQUOTAS value in quotas.h should be increased, and the
* additional dquots set up here.
*/
int
lfs_getinoquota(struct inode *ip)
{
struct ulfsmount *ump = ip->i_ump;
//struct lfs *fs = ump->um_lfs; // notyet
struct vnode *vp = ITOV(ip);
int i, error;
u_int32_t ino_ids[ULFS_MAXQUOTAS];
/*
* To avoid deadlocks never update quotas for quota files
* on the same file system
*/
for (i = 0; i < ULFS_MAXQUOTAS; i++)
if (vp == ump->um_quotas[i])
return 0;
ino_ids[ULFS_USRQUOTA] = ip->i_uid;
ino_ids[ULFS_GRPQUOTA] = ip->i_gid;
for (i = 0; i < ULFS_MAXQUOTAS; i++) {
/*
* If the file id changed the quota needs update.
*/
if (ip->i_dquot[i] != NODQUOT &&
ip->i_dquot[i]->dq_id != ino_ids[i]) {
lfs_dqrele(ITOV(ip), ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
/*
* Set up the quota based on file id.
* ENODEV means that quotas are not enabled.
*/
if (ip->i_dquot[i] == NODQUOT &&
(error = lfs_dqget(vp, ino_ids[i], ump, i, &ip->i_dquot[i])) &&
error != ENODEV)
return (error);
}
return 0;
}
/*
* Obtain a dquot structure for the specified identifier and quota file
* reading the information from the file if necessary.
*/
int
lfs_dqget(struct vnode *vp, u_long id, struct ulfsmount *ump, int type,
struct dquot **dqp)
{
struct lfs *fs = ump->um_lfs;
struct dquot *dq, *ndq;
struct dqhashhead *dqh;
struct vnode *dqvp;
int error = 0; /* XXX gcc */
/* Lock to see an up to date value for QTF_CLOSING. */
mutex_enter(&lfs_dqlock);
if ((fs->um_flags & (ULFS_QUOTA|ULFS_QUOTA2)) == 0) {
mutex_exit(&lfs_dqlock);
*dqp = NODQUOT;
return (ENODEV);
}
dqvp = ump->um_quotas[type];
#ifdef LFS_QUOTA
if (fs->um_flags & ULFS_QUOTA) {
if (dqvp == NULLVP || (ump->umq1_qflags[type] & QTF_CLOSING)) {
mutex_exit(&lfs_dqlock);
*dqp = NODQUOT;
return (ENODEV);
}
}
#endif
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2) {
if (dqvp == NULLVP) {
mutex_exit(&lfs_dqlock);
*dqp = NODQUOT;
return (ENODEV);
}
}
#endif
KASSERT(dqvp != vp);
/*
* Check the cache first.
*/
dqh = &dqhashtbl[DQHASH(dqvp, id)];
LIST_FOREACH(dq, dqh, dq_hash) {
if (dq->dq_id != id ||
dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
continue;
KASSERT(dq->dq_cnt > 0);
lfs_dqref(dq);
mutex_exit(&lfs_dqlock);
*dqp = dq;
return (0);
}
/*
* Not in cache, allocate a new one.
*/
mutex_exit(&lfs_dqlock);
ndq = pool_cache_get(dquot_cache, PR_WAITOK);
/*
* Initialize the contents of the dquot structure.
*/
memset((char *)ndq, 0, sizeof *ndq);
ndq->dq_flags = 0;
ndq->dq_id = id;
ndq->dq_ump = ump;
ndq->dq_type = type;
mutex_init(&ndq->dq_interlock, MUTEX_DEFAULT, IPL_NONE);
mutex_enter(&lfs_dqlock);
dqh = &dqhashtbl[DQHASH(dqvp, id)];
LIST_FOREACH(dq, dqh, dq_hash) {
if (dq->dq_id != id ||
dq->dq_ump->um_quotas[dq->dq_type] != dqvp)
continue;
/*
* Another thread beat us allocating this dquot.
*/
KASSERT(dq->dq_cnt > 0);
lfs_dqref(dq);
mutex_exit(&lfs_dqlock);
mutex_destroy(&ndq->dq_interlock);
pool_cache_put(dquot_cache, ndq);
*dqp = dq;
return 0;
}
dq = ndq;
LIST_INSERT_HEAD(dqh, dq, dq_hash);
lfs_dqref(dq);
mutex_enter(&dq->dq_interlock);
mutex_exit(&lfs_dqlock);
#ifdef LFS_QUOTA
if (fs->um_flags & ULFS_QUOTA)
error = lfs_dq1get(dqvp, id, ump, type, dq);
#endif
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2)
error = lfs_dq2get(dqvp, id, ump, type, dq);
#endif
/*
* I/O error in reading quota file, release
* quota structure and reflect problem to caller.
*/
if (error) {
mutex_enter(&lfs_dqlock);
LIST_REMOVE(dq, dq_hash);
mutex_exit(&lfs_dqlock);
mutex_exit(&dq->dq_interlock);
lfs_dqrele(vp, dq);
*dqp = NODQUOT;
return (error);
}
mutex_exit(&dq->dq_interlock);
*dqp = dq;
return (0);
}
/*
* Obtain a reference to a dquot.
*/
void
lfs_dqref(struct dquot *dq)
{
KASSERT(mutex_owned(&lfs_dqlock));
dq->dq_cnt++;
KASSERT(dq->dq_cnt > 0);
}
/*
* Release a reference to a dquot.
*/
void
lfs_dqrele(struct vnode *vp, struct dquot *dq)
{
if (dq == NODQUOT)
return;
mutex_enter(&dq->dq_interlock);
for (;;) {
mutex_enter(&lfs_dqlock);
if (dq->dq_cnt > 1) {
dq->dq_cnt--;
mutex_exit(&lfs_dqlock);
mutex_exit(&dq->dq_interlock);
return;
}
if ((dq->dq_flags & DQ_MOD) == 0)
break;
mutex_exit(&lfs_dqlock);
#ifdef LFS_QUOTA
if (dq->dq_ump->um_lfs->um_flags & ULFS_QUOTA)
(void) lfs_dq1sync(vp, dq);
#endif
#ifdef LFS_QUOTA2
if (dq->dq_ump->um_lfs->um_flags & ULFS_QUOTA2)
(void) lfs_dq2sync(vp, dq);
#endif
}
KASSERT(dq->dq_cnt == 1 && (dq->dq_flags & DQ_MOD) == 0);
LIST_REMOVE(dq, dq_hash);
mutex_exit(&lfs_dqlock);
mutex_exit(&dq->dq_interlock);
mutex_destroy(&dq->dq_interlock);
pool_cache_put(dquot_cache, dq);
}
int
lfs_qsync(struct mount *mp)
{
struct ulfsmount *ump = VFSTOULFS(mp);
struct lfs *fs = ump->um_lfs;
/* avoid compiler warning when quotas aren't enabled */
(void)ump;
(void)fs;
#ifdef LFS_QUOTA
if (fs->um_flags & ULFS_QUOTA)
return lfs_q1sync(mp);
#endif
#ifdef LFS_QUOTA2
if (fs->um_flags & ULFS_QUOTA2)
return lfs_q2sync(mp);
#endif
return 0;
}
#ifdef DIAGNOSTIC
/*
* Check the hash chains for stray dquot's.
*/
void
lfs_dqflush(struct vnode *vp)
{
struct dquot *dq;
int i;
mutex_enter(&lfs_dqlock);
for (i = 0; i <= dqhash; i++)
LIST_FOREACH(dq, &dqhashtbl[i], dq_hash)
KASSERT(dq->dq_ump->um_quotas[dq->dq_type] != vp);
mutex_exit(&lfs_dqlock);
}
#endif