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/buffer_head.h>
  47 # include <linux/workqueue.h>
  48 # include <linux/mount.h>
  49 #else /* __KERNEL__ */
  50 # include <liblustre.h>
  51 #endif
  52
  53 #include <obd_class.h>
  54 #include <lustre_mds.h>
  55 #include <lustre_dlm.h>
  56 #include <lustre_cfg.h>
  57 #include <obd_ost.h>
  58 #include <lustre_fsfilt.h>
  59 #include <linux/lustre_quota.h>
  60 #include "quota_internal.h"
  61
  62 #ifdef __KERNEL__
  63 /**
  64  * This function is charge of recording lqs_ino_rec and
  65  * lqs_blk_rec. when a lquota slave checks a quota
  66  * request(check_cur_qunit) and finishes a quota
  67  * request(dqacq_completion), it will be called.
  68  * is_chk: whether it is checking quota; otherwise, it is finishing
  69  * is_acq: whether it is acquiring; otherwise, it is releasing
  70  */
  71 void quota_compute_lqs(struct qunit_data *qdata, struct lustre_qunit_size *lqs,
  72                        int is_chk, int is_acq)
  73 {
  74         long long *rec;
  75
  76         LASSERT(qdata && lqs);
  77         LASSERT_SPIN_LOCKED(&lqs->lqs_lock);
  78
  79         rec = QDATA_IS_BLK(qdata) ? &lqs->lqs_blk_rec : &lqs->lqs_ino_rec;
  80
  81         if (!!is_chk + !!is_acq == 1)
  82                 *rec -= qdata->qd_count;
  83         else
  84                 *rec += qdata->qd_count;
  85
  86 }
  87
  88 struct lustre_qunit_size *quota_search_lqs(unsigned long long lqs_key,
  89                                            struct lustre_quota_ctxt *qctxt,
  90                                            int create)
  91 {
  92         struct lustre_qunit_size *lqs;
  93         struct lustre_qunit_size *lqs2;
  94         cfs_hash_t *hs = NULL;
  95         int rc = 0;
  96
  97         cfs_spin_lock(&qctxt->lqc_lock);
  98         if (qctxt->lqc_valid) {
  99                 LASSERT(qctxt->lqc_lqs_hash != NULL);
 100                 hs = cfs_hash_getref(qctxt->lqc_lqs_hash);
 101         }
 102         cfs_spin_unlock(&qctxt->lqc_lock);
 103
 104         if (hs == NULL) {
 105                 rc = -EBUSY;
 106                 goto out;
 107         }
 108
 109         /* cfs_hash_lookup will +1 refcount for caller */
 110         lqs = cfs_hash_lookup(qctxt->lqc_lqs_hash, &lqs_key);
 111         if (lqs != NULL) /* found */
 112                 goto out_put;
 113
 114         if (!create)
 115                 goto out_put;
 116
 117         OBD_ALLOC_PTR(lqs);
 118         if (!lqs) {
 119                 rc = -ENOMEM;
 120                 goto out_put;
 121         }
 122
 123         lqs->lqs_key = lqs_key;
 124
 125         cfs_spin_lock_init(&lqs->lqs_lock);
 126
 127         lqs->lqs_bwrite_pending = 0;
 128         lqs->lqs_iwrite_pending = 0;
 129         lqs->lqs_ino_rec = 0;
 130         lqs->lqs_blk_rec = 0;
 131         lqs->lqs_id = LQS_KEY_ID(lqs->lqs_key);
 132         lqs->lqs_flags = LQS_KEY_GRP(lqs->lqs_key) ? LQUOTA_FLAGS_GRP : 0;
 133         lqs->lqs_bunit_sz = qctxt->lqc_bunit_sz;
 134         lqs->lqs_iunit_sz = qctxt->lqc_iunit_sz;
 135         lqs->lqs_btune_sz = qctxt->lqc_btune_sz;
 136         lqs->lqs_itune_sz = qctxt->lqc_itune_sz;
 137         if (qctxt->lqc_handler) {
 138                 lqs->lqs_last_bshrink  = 0;
 139                 lqs->lqs_last_ishrink  = 0;
 140         }
 141
 142         lqs->lqs_ctxt = qctxt; /* must be called before lqs_initref */
 143         cfs_atomic_set(&lqs->lqs_refcount, 1); /* 1 for caller */
 144         cfs_atomic_inc(&lqs->lqs_ctxt->lqc_lqs);
 145
 146         /* lqc_lqs_hash will take +1 refcount on lqs on adding */
 147         lqs2 = cfs_hash_findadd_unique(qctxt->lqc_lqs_hash,
 148                                        &lqs->lqs_key, &lqs->lqs_hash);
 149         if (lqs2 == lqs) /* added to hash */
 150                 goto out_put;
 151
 152         create = 0;
 153         lqs_putref(lqs);
 154         lqs = lqs2;
 155
 156  out_put:
 157         cfs_hash_putref(hs);
 158  out:
 159         if (rc != 0) { /* error */
 160                 CERROR("get lqs error(rc: %d)\n", rc);
 161                 return ERR_PTR(rc);
 162         }
 163
 164         if (lqs != NULL) {
 165                 LQS_DEBUG(lqs, "%s\n",
 166                           (create == 1 ? "create lqs" : "search lqs"));
 167         }
 168         return lqs;
 169 }
 170
 171 int quota_adjust_slave_lqs(struct quota_adjust_qunit *oqaq,
 172                            struct lustre_quota_ctxt *qctxt)
 173 {
 174         struct lustre_qunit_size *lqs = NULL;
 175         unsigned long *unit, *tune;
 176         signed long tmp = 0;
 177         cfs_time_t time_limit = 0, *shrink;
 178         int i, rc = 0;
 179         ENTRY;
 180
 181         LASSERT(qctxt);
 182         lqs = quota_search_lqs(LQS_KEY(QAQ_IS_GRP(oqaq), oqaq->qaq_id),
 183                                qctxt, QAQ_IS_CREATE_LQS(oqaq) ? 1 : 0);
 184         if (lqs == NULL || IS_ERR(lqs)){
 185                 CERROR("fail to find a lqs for %sid %u!\n",
 186                        QAQ_IS_GRP(oqaq) ? "g" : "u", oqaq->qaq_id);
 187                 RETURN(PTR_ERR(lqs));
 188         }
 189
 190         CDEBUG(D_QUOTA, "before: bunit: %lu, iunit: %lu.\n",
 191                lqs->lqs_bunit_sz, lqs->lqs_iunit_sz);
 192         cfs_spin_lock(&lqs->lqs_lock);
 193         for (i = 0; i < 2; i++) {
 194                 if (i == 0 && !QAQ_IS_ADJBLK(oqaq))
 195                         continue;
 196
 197                 if (i == 1 && !QAQ_IS_ADJINO(oqaq))
 198                         continue;
 199
 200                 tmp = i ? (lqs->lqs_iunit_sz - oqaq->qaq_iunit_sz) :
 201                           (lqs->lqs_bunit_sz - oqaq->qaq_bunit_sz);
 202                 shrink = i ? &lqs->lqs_last_ishrink :
 203                              &lqs->lqs_last_bshrink;
 204                 time_limit = cfs_time_add(i ? lqs->lqs_last_ishrink :
 205                                               lqs->lqs_last_bshrink,
 206                                    cfs_time_seconds(qctxt->lqc_switch_seconds));
 207                 unit = i ? &lqs->lqs_iunit_sz : &lqs->lqs_bunit_sz;
 208                 tune = i ? &lqs->lqs_itune_sz : &lqs->lqs_btune_sz;
 209
 210                 /* quota master shrinks */
 211                 if (qctxt->lqc_handler && tmp > 0)
 212                         *shrink = cfs_time_current();
 213
 214                 /* quota master enlarges */
 215                 if (qctxt->lqc_handler && tmp < 0) {
 216                         /* in case of ping-pong effect, don't enlarge lqs
 217                          * in a short time */
 218                         if (*shrink &&
 219                             cfs_time_before(cfs_time_current(), time_limit))
 220                                 tmp = 0;
 221                 }
 222
 223                 /* when setquota, don't enlarge lqs b=18616 */
 224                 if (QAQ_IS_CREATE_LQS(oqaq) && tmp < 0)
 225                         tmp = 0;
 226
 227                 if (tmp != 0) {
 228                         *unit = i ? oqaq->qaq_iunit_sz : oqaq->qaq_bunit_sz;
 229                         *tune = (*unit) / 2;
 230                 }
 231
 232
 233                 if (tmp > 0)
 234                         rc |= i ? LQS_INO_DECREASE : LQS_BLK_DECREASE;
 235                 if (tmp < 0)
 236                         rc |= i ? LQS_INO_INCREASE : LQS_BLK_INCREASE;
 237         }
 238         cfs_spin_unlock(&lqs->lqs_lock);
 239         CDEBUG(D_QUOTA, "after: bunit: %lu, iunit: %lu.\n",
 240                lqs->lqs_bunit_sz, lqs->lqs_iunit_sz);
 241
 242         lqs_putref(lqs);
 243
 244         RETURN(rc);
 245 }
 246
 247 int filter_quota_adjust_qunit(struct obd_export *exp,
 248                               struct quota_adjust_qunit *oqaq,
 249                               struct lustre_quota_ctxt *qctxt,
 250                               struct ptlrpc_request_set *rqset)
 251 {
 252         struct obd_device *obd = exp->exp_obd;
 253         unsigned int id[MAXQUOTAS] = { 0, 0 };
 254         int rc = 0;
 255         ENTRY;
 256
 257         LASSERT(oqaq);
 258         LASSERT(QAQ_IS_ADJBLK(oqaq));
 259         rc = quota_adjust_slave_lqs(oqaq, qctxt);
 260         if (rc < 0) {
 261                 CERROR("adjust mds slave's qunit size failed!(rc:%d)\n", rc);
 262                 RETURN(rc);
 263         }
 264         if (QAQ_IS_GRP(oqaq))
 265                 id[GRPQUOTA] = oqaq->qaq_id;
 266         else
 267                 id[USRQUOTA] = oqaq->qaq_id;
 268
 269         if (rc > 0) {
 270                 rc = qctxt_adjust_qunit(obd, qctxt, id, 1, 0, NULL);
 271                 if (rc == -EDQUOT || rc == -EBUSY ||
 272                     rc == QUOTA_REQ_RETURNED || rc == -EAGAIN) {
 273                         CDEBUG(D_QUOTA, "rc: %d.\n", rc);
 274                         rc = 0;
 275                 }
 276                 if (rc)
 277                         CERROR("slave adjust block quota failed!(rc:%d)\n", rc);
 278         }
 279         RETURN(rc);
 280 }
 281 #endif /* __KERNEL__ */