lustre/quota/quota_adjust_qunit.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Whamcloud, Inc.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LQUOTA
  38
  39 #ifdef __KERNEL__
  40 # include <linux/version.h>
  41 # include <linux/module.h>
  42 # include <linux/init.h>
  43 # include <linux/fs.h>
  44 # include <linux/jbd.h>
  45 # include <linux/quota.h>
  46 # include <linux/smp_lock.h>
  47 # include <linux/buffer_head.h>
  48 # include <linux/workqueue.h>
  49 # include <linux/mount.h>
  50 #else /* __KERNEL__ */
  51 # include <liblustre.h>
  52 #endif
  53
  54 #include <obd_class.h>
  55 #include <lustre_mds.h>
  56 #include <lustre_dlm.h>
  57 #include <lustre_cfg.h>
  58 #include <obd_ost.h>
  59 #include <lustre_fsfilt.h>
  60 #include <linux/lustre_quota.h>
  61 #include "quota_internal.h"
  62
  63 #ifdef __KERNEL__
  64 /**
  65  * This function is charge of recording lqs_ino_rec and
  66  * lqs_blk_rec. when a lquota slave checks a quota
  67  * request(check_cur_qunit) and finishes a quota
  68  * request(dqacq_completion), it will be called.
  69  * is_chk: whether it is checking quota; otherwise, it is finishing
  70  * is_acq: whether it is acquiring; otherwise, it is releasing
  71  */
  72 void quota_compute_lqs(struct qunit_data *qdata, struct lustre_qunit_size *lqs,
  73                        int is_chk, int is_acq)
  74 {
  75         long long *rec;
  76
  77         LASSERT(qdata && lqs);
  78         LASSERT_SPIN_LOCKED(&lqs->lqs_lock);
  79
  80         rec = QDATA_IS_BLK(qdata) ? &lqs->lqs_blk_rec : &lqs->lqs_ino_rec;
  81
  82         if (!!is_chk + !!is_acq == 1)
  83                 *rec -= qdata->qd_count;
  84         else
  85                 *rec += qdata->qd_count;
  86
  87 }
  88
  89 struct lustre_qunit_size *quota_search_lqs(unsigned long long lqs_key,
  90                                            struct lustre_quota_ctxt *qctxt,
  91                                            int create)
  92 {
  93         struct lustre_qunit_size *lqs;
  94         struct lustre_qunit_size *lqs2;
  95         cfs_hash_t *hs = NULL;
  96         int rc = 0;
  97
  98         cfs_spin_lock(&qctxt->lqc_lock);
  99         if (qctxt->lqc_valid) {
 100                 LASSERT(qctxt->lqc_lqs_hash != NULL);
 101                 hs = cfs_hash_getref(qctxt->lqc_lqs_hash);
 102         }
 103         cfs_spin_unlock(&qctxt->lqc_lock);
 104
 105         if (hs == NULL) {
 106                 rc = -EBUSY;
 107                 goto out;
 108         }
 109
 110         /* cfs_hash_lookup will +1 refcount for caller */
 111         lqs = cfs_hash_lookup(qctxt->lqc_lqs_hash, &lqs_key);
 112         if (lqs != NULL) /* found */
 113                 goto out_put;
 114
 115         if (!create)
 116                 goto out_put;
 117
 118         OBD_ALLOC_PTR(lqs);
 119         if (!lqs) {
 120                 rc = -ENOMEM;
 121                 goto out_put;
 122         }
 123
 124         lqs->lqs_key = lqs_key;
 125
 126         cfs_spin_lock_init(&lqs->lqs_lock);
 127
 128         lqs->lqs_bwrite_pending = 0;
 129         lqs->lqs_iwrite_pending = 0;
 130         lqs->lqs_ino_rec = 0;
 131         lqs->lqs_blk_rec = 0;
 132         lqs->lqs_id = LQS_KEY_ID(lqs->lqs_key);
 133         lqs->lqs_flags = LQS_KEY_GRP(lqs->lqs_key) ? LQUOTA_FLAGS_GRP : 0;
 134         lqs->lqs_bunit_sz = qctxt->lqc_bunit_sz;
 135         lqs->lqs_iunit_sz = qctxt->lqc_iunit_sz;
 136         lqs->lqs_btune_sz = qctxt->lqc_btune_sz;
 137         lqs->lqs_itune_sz = qctxt->lqc_itune_sz;
 138         if (qctxt->lqc_handler) {
 139                 lqs->lqs_last_bshrink  = 0;
 140                 lqs->lqs_last_ishrink  = 0;
 141         }
 142
 143         lqs->lqs_ctxt = qctxt; /* must be called before lqs_initref */
 144         cfs_atomic_set(&lqs->lqs_refcount, 1); /* 1 for caller */
 145         cfs_atomic_inc(&lqs->lqs_ctxt->lqc_lqs);
 146
 147         /* lqc_lqs_hash will take +1 refcount on lqs on adding */
 148         lqs2 = cfs_hash_findadd_unique(qctxt->lqc_lqs_hash,
 149                                        &lqs->lqs_key, &lqs->lqs_hash);
 150         if (lqs2 == lqs) /* added to hash */
 151                 goto out_put;
 152
 153         create = 0;
 154         lqs_putref(lqs);
 155         lqs = lqs2;
 156
 157  out_put:
 158         cfs_hash_putref(hs);
 159  out:
 160         if (rc != 0) { /* error */
 161                 CERROR("get lqs error(rc: %d)\n", rc);
 162                 return ERR_PTR(rc);
 163         }
 164
 165         if (lqs != NULL) {
 166                 LQS_DEBUG(lqs, "%s\n",
 167                           (create == 1 ? "create lqs" : "search lqs"));
 168         }
 169         return lqs;
 170 }
 171
 172 int quota_adjust_slave_lqs(struct quota_adjust_qunit *oqaq,
 173                            struct lustre_quota_ctxt *qctxt)
 174 {
 175         struct lustre_qunit_size *lqs = NULL;
 176         unsigned long *unit, *tune;
 177         signed long tmp = 0;
 178         cfs_time_t time_limit = 0, *shrink;
 179         int i, rc = 0;
 180         ENTRY;
 181
 182         LASSERT(qctxt);
 183         lqs = quota_search_lqs(LQS_KEY(QAQ_IS_GRP(oqaq), oqaq->qaq_id),
 184                                qctxt, QAQ_IS_CREATE_LQS(oqaq) ? 1 : 0);
 185         if (lqs == NULL || IS_ERR(lqs)){
 186                 CERROR("fail to find a lqs for %sid %u!\n",
 187                        QAQ_IS_GRP(oqaq) ? "g" : "u", oqaq->qaq_id);
 188                 RETURN(PTR_ERR(lqs));
 189         }
 190
 191         CDEBUG(D_QUOTA, "before: bunit: %lu, iunit: %lu.\n",
 192                lqs->lqs_bunit_sz, lqs->lqs_iunit_sz);
 193         cfs_spin_lock(&lqs->lqs_lock);
 194         for (i = 0; i < 2; i++) {
 195                 if (i == 0 && !QAQ_IS_ADJBLK(oqaq))
 196                         continue;
 197
 198                 if (i == 1 && !QAQ_IS_ADJINO(oqaq))
 199                         continue;
 200
 201                 tmp = i ? (lqs->lqs_iunit_sz - oqaq->qaq_iunit_sz) :
 202                           (lqs->lqs_bunit_sz - oqaq->qaq_bunit_sz);
 203                 shrink = i ? &lqs->lqs_last_ishrink :
 204                              &lqs->lqs_last_bshrink;
 205                 time_limit = cfs_time_add(i ? lqs->lqs_last_ishrink :
 206                                               lqs->lqs_last_bshrink,
 207                                    cfs_time_seconds(qctxt->lqc_switch_seconds));
 208                 unit = i ? &lqs->lqs_iunit_sz : &lqs->lqs_bunit_sz;
 209                 tune = i ? &lqs->lqs_itune_sz : &lqs->lqs_btune_sz;
 210
 211                 /* quota master shrinks */
 212                 if (qctxt->lqc_handler && tmp > 0)
 213                         *shrink = cfs_time_current();
 214
 215                 /* quota master enlarges */
 216                 if (qctxt->lqc_handler && tmp < 0) {
 217                         /* in case of ping-pong effect, don't enlarge lqs
 218                          * in a short time */
 219                         if (*shrink &&
 220                             cfs_time_before(cfs_time_current(), time_limit))
 221                                 tmp = 0;
 222                 }
 223
 224                 /* when setquota, don't enlarge lqs b=18616 */
 225                 if (QAQ_IS_CREATE_LQS(oqaq) && tmp < 0)
 226                         tmp = 0;
 227
 228                 if (tmp != 0) {
 229                         *unit = i ? oqaq->qaq_iunit_sz : oqaq->qaq_bunit_sz;
 230                         *tune = (*unit) / 2;
 231                 }
 232
 233
 234                 if (tmp > 0)
 235                         rc |= i ? LQS_INO_DECREASE : LQS_BLK_DECREASE;
 236                 if (tmp < 0)
 237                         rc |= i ? LQS_INO_INCREASE : LQS_BLK_INCREASE;
 238         }
 239         cfs_spin_unlock(&lqs->lqs_lock);
 240         CDEBUG(D_QUOTA, "after: bunit: %lu, iunit: %lu.\n",
 241                lqs->lqs_bunit_sz, lqs->lqs_iunit_sz);
 242
 243         lqs_putref(lqs);
 244
 245         RETURN(rc);
 246 }
 247
 248 int filter_quota_adjust_qunit(struct obd_export *exp,
 249                               struct quota_adjust_qunit *oqaq,
 250                               struct lustre_quota_ctxt *qctxt,
 251                               struct ptlrpc_request_set *rqset)
 252 {
 253         struct obd_device *obd = exp->exp_obd;
 254         unsigned int id[MAXQUOTAS] = { 0, 0 };
 255         int rc = 0;
 256         ENTRY;
 257
 258         LASSERT(oqaq);
 259         LASSERT(QAQ_IS_ADJBLK(oqaq));
 260         rc = quota_adjust_slave_lqs(oqaq, qctxt);
 261         if (rc < 0) {
 262                 CERROR("adjust mds slave's qunit size failed!(rc:%d)\n", rc);
 263                 RETURN(rc);
 264         }
 265         if (QAQ_IS_GRP(oqaq))
 266                 id[GRPQUOTA] = oqaq->qaq_id;
 267         else
 268                 id[USRQUOTA] = oqaq->qaq_id;
 269
 270         if (rc > 0) {
 271                 rc = qctxt_adjust_qunit(obd, qctxt, id, 1, 0, NULL);
 272                 if (rc == -EDQUOT || rc == -EBUSY ||
 273                     rc == QUOTA_REQ_RETURNED || rc == -EAGAIN) {
 274                         CDEBUG(D_QUOTA, "rc: %d.\n", rc);
 275                         rc = 0;
 276                 }
 277                 if (rc)
 278                         CERROR("slave adjust block quota failed!(rc:%d)\n", rc);
 279         }
 280         RETURN(rc);
 281 }
 282 #endif /* __KERNEL__ */