lustre/quota/quota_adjust_qunit.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  *
  32  * Copyright (c) 2012, Whamcloud, Inc.
  33  */
  34 /*
  35  * This file is part of Lustre, http://www.lustre.org/
  36  * Lustre is a trademark of Sun Microsystems, Inc.
  37  */
  38 #ifndef EXPORT_SYMTAB
  39 # define EXPORT_SYMTAB
  40 #endif
  41 #define DEBUG_SUBSYSTEM S_LQUOTA
  42
  43 #ifdef __KERNEL__
  44 # include <linux/version.h>
  45 # include <linux/module.h>
  46 # include <linux/init.h>
  47 # include <linux/fs.h>
  48 # include <linux/jbd.h>
  49 # include <linux/quota.h>
  50 # include <linux/smp_lock.h>
  51 # include <linux/buffer_head.h>
  52 # include <linux/workqueue.h>
  53 # include <linux/mount.h>
  54 #else /* __KERNEL__ */
  55 # include <liblustre.h>
  56 #endif
  57
  58 #include <obd_class.h>
  59 #include <lustre_mds.h>
  60 #include <lustre_dlm.h>
  61 #include <lustre_cfg.h>
  62 #include <obd_ost.h>
  63 #include <lustre_fsfilt.h>
  64 #include <linux/lustre_quota.h>
  65 #include "quota_internal.h"
  66
  67 #ifdef HAVE_QUOTA_SUPPORT
  68
  69 #ifdef __KERNEL__
  70 /**
  71  * This function is charge of recording lqs_ino_rec and
  72  * lqs_blk_rec. when a lquota slave checks a quota
  73  * request(check_cur_qunit) and finishes a quota
  74  * request(dqacq_completion), it will be called.
  75  * is_chk: whether it is checking quota; otherwise, it is finishing
  76  * is_acq: whether it is acquiring; otherwise, it is releasing
  77  */
  78 void quota_compute_lqs(struct qunit_data *qdata, struct lustre_qunit_size *lqs,
  79                        int is_chk, int is_acq)
  80 {
  81         long long *rec;
  82
  83         LASSERT(qdata && lqs);
  84         LASSERT_SPIN_LOCKED(&lqs->lqs_lock);
  85
  86         rec = QDATA_IS_BLK(qdata) ? &lqs->lqs_blk_rec : &lqs->lqs_ino_rec;
  87
  88         if (!!is_chk + !!is_acq == 1)
  89                 *rec -= qdata->qd_count;
  90         else
  91                 *rec += qdata->qd_count;
  92
  93 }
  94
  95 struct lustre_qunit_size *quota_search_lqs(unsigned long long lqs_key,
  96                                            struct lustre_quota_ctxt *qctxt,
  97                                            int create)
  98 {
  99         struct lustre_qunit_size *lqs;
 100         struct lustre_qunit_size *lqs2;
 101         cfs_hash_t *hs = NULL;
 102         int rc = 0;
 103
 104         cfs_spin_lock(&qctxt->lqc_lock);
 105         if (qctxt->lqc_valid) {
 106                 LASSERT(qctxt->lqc_lqs_hash != NULL);
 107                 hs = cfs_hash_getref(qctxt->lqc_lqs_hash);
 108         }
 109         cfs_spin_unlock(&qctxt->lqc_lock);
 110
 111         if (hs == NULL) {
 112                 rc = -EBUSY;
 113                 goto out;
 114         }
 115
 116         /* cfs_hash_lookup will +1 refcount for caller */
 117         lqs = cfs_hash_lookup(qctxt->lqc_lqs_hash, &lqs_key);
 118         if (lqs != NULL) /* found */
 119                 goto out_put;
 120
 121         if (!create)
 122                 goto out_put;
 123
 124         OBD_ALLOC_PTR(lqs);
 125         if (!lqs) {
 126                 rc = -ENOMEM;
 127                 goto out_put;
 128         }
 129
 130         lqs->lqs_key = lqs_key;
 131
 132         cfs_spin_lock_init(&lqs->lqs_lock);
 133
 134         lqs->lqs_bwrite_pending = 0;
 135         lqs->lqs_iwrite_pending = 0;
 136         lqs->lqs_ino_rec = 0;
 137         lqs->lqs_blk_rec = 0;
 138         lqs->lqs_id = LQS_KEY_ID(lqs->lqs_key);
 139         lqs->lqs_flags = LQS_KEY_GRP(lqs->lqs_key) ? LQUOTA_FLAGS_GRP : 0;
 140         lqs->lqs_bunit_sz = qctxt->lqc_bunit_sz;
 141         lqs->lqs_iunit_sz = qctxt->lqc_iunit_sz;
 142         lqs->lqs_btune_sz = qctxt->lqc_btune_sz;
 143         lqs->lqs_itune_sz = qctxt->lqc_itune_sz;
 144         if (qctxt->lqc_handler) {
 145                 lqs->lqs_last_bshrink  = 0;
 146                 lqs->lqs_last_ishrink  = 0;
 147         }
 148
 149         lqs->lqs_ctxt = qctxt; /* must be called before lqs_initref */
 150         cfs_atomic_set(&lqs->lqs_refcount, 1); /* 1 for caller */
 151         cfs_atomic_inc(&lqs->lqs_ctxt->lqc_lqs);
 152
 153         /* lqc_lqs_hash will take +1 refcount on lqs on adding */
 154         lqs2 = cfs_hash_findadd_unique(qctxt->lqc_lqs_hash,
 155                                        &lqs->lqs_key, &lqs->lqs_hash);
 156         if (lqs2 == lqs) /* added to hash */
 157                 goto out_put;
 158
 159         create = 0;
 160         lqs_putref(lqs);
 161         lqs = lqs2;
 162
 163  out_put:
 164         cfs_hash_putref(hs);
 165  out:
 166         if (rc != 0) { /* error */
 167                 CERROR("get lqs error(rc: %d)\n", rc);
 168                 return ERR_PTR(rc);
 169         }
 170
 171         if (lqs != NULL) {
 172                 LQS_DEBUG(lqs, "%s\n",
 173                           (create == 1 ? "create lqs" : "search lqs"));
 174         }
 175         return lqs;
 176 }
 177
 178 int quota_adjust_slave_lqs(struct quota_adjust_qunit *oqaq,
 179                            struct lustre_quota_ctxt *qctxt)
 180 {
 181         struct lustre_qunit_size *lqs = NULL;
 182         unsigned long *unit, *tune;
 183         signed long tmp = 0;
 184         cfs_time_t time_limit = 0, *shrink;
 185         int i, rc = 0;
 186         ENTRY;
 187
 188         LASSERT(qctxt);
 189         lqs = quota_search_lqs(LQS_KEY(QAQ_IS_GRP(oqaq), oqaq->qaq_id),
 190                                qctxt, QAQ_IS_CREATE_LQS(oqaq) ? 1 : 0);
 191         if (lqs == NULL || IS_ERR(lqs)){
 192                 CERROR("fail to find a lqs for %sid %u!\n",
 193                        QAQ_IS_GRP(oqaq) ? "g" : "u", oqaq->qaq_id);
 194                 RETURN(PTR_ERR(lqs));
 195         }
 196
 197         CDEBUG(D_QUOTA, "before: bunit: %lu, iunit: %lu.\n",
 198                lqs->lqs_bunit_sz, lqs->lqs_iunit_sz);
 199         cfs_spin_lock(&lqs->lqs_lock);
 200         for (i = 0; i < 2; i++) {
 201                 if (i == 0 && !QAQ_IS_ADJBLK(oqaq))
 202                         continue;
 203
 204                 if (i == 1 && !QAQ_IS_ADJINO(oqaq))
 205                         continue;
 206
 207                 tmp = i ? (lqs->lqs_iunit_sz - oqaq->qaq_iunit_sz) :
 208                           (lqs->lqs_bunit_sz - oqaq->qaq_bunit_sz);
 209                 shrink = i ? &lqs->lqs_last_ishrink :
 210                              &lqs->lqs_last_bshrink;
 211                 time_limit = cfs_time_add(i ? lqs->lqs_last_ishrink :
 212                                               lqs->lqs_last_bshrink,
 213                                    cfs_time_seconds(qctxt->lqc_switch_seconds));
 214                 unit = i ? &lqs->lqs_iunit_sz : &lqs->lqs_bunit_sz;
 215                 tune = i ? &lqs->lqs_itune_sz : &lqs->lqs_btune_sz;
 216
 217                 /* quota master shrinks */
 218                 if (qctxt->lqc_handler && tmp > 0)
 219                         *shrink = cfs_time_current();
 220
 221                 /* quota master enlarges */
 222                 if (qctxt->lqc_handler && tmp < 0) {
 223                         /* in case of ping-pong effect, don't enlarge lqs
 224                          * in a short time */
 225                         if (*shrink &&
 226                             cfs_time_before(cfs_time_current(), time_limit))
 227                                 tmp = 0;
 228                 }
 229
 230                 /* when setquota, don't enlarge lqs b=18616 */
 231                 if (QAQ_IS_CREATE_LQS(oqaq) && tmp < 0)
 232                         tmp = 0;
 233
 234                 if (tmp != 0) {
 235                         *unit = i ? oqaq->qaq_iunit_sz : oqaq->qaq_bunit_sz;
 236                         *tune = (*unit) / 2;
 237                 }
 238
 239
 240                 if (tmp > 0)
 241                         rc |= i ? LQS_INO_DECREASE : LQS_BLK_DECREASE;
 242                 if (tmp < 0)
 243                         rc |= i ? LQS_INO_INCREASE : LQS_BLK_INCREASE;
 244         }
 245         cfs_spin_unlock(&lqs->lqs_lock);
 246         CDEBUG(D_QUOTA, "after: bunit: %lu, iunit: %lu.\n",
 247                lqs->lqs_bunit_sz, lqs->lqs_iunit_sz);
 248
 249         lqs_putref(lqs);
 250
 251         RETURN(rc);
 252 }
 253
 254 int filter_quota_adjust_qunit(struct obd_export *exp,
 255                               struct quota_adjust_qunit *oqaq,
 256                               struct lustre_quota_ctxt *qctxt,
 257                               struct ptlrpc_request_set *rqset)
 258 {
 259         struct obd_device *obd = exp->exp_obd;
 260         unsigned int id[MAXQUOTAS] = { 0, 0 };
 261         int rc = 0;
 262         ENTRY;
 263
 264         LASSERT(oqaq);
 265         LASSERT(QAQ_IS_ADJBLK(oqaq));
 266         rc = quota_adjust_slave_lqs(oqaq, qctxt);
 267         if (rc < 0) {
 268                 CERROR("adjust mds slave's qunit size failed!(rc:%d)\n", rc);
 269                 RETURN(rc);
 270         }
 271         if (QAQ_IS_GRP(oqaq))
 272                 id[GRPQUOTA] = oqaq->qaq_id;
 273         else
 274                 id[USRQUOTA] = oqaq->qaq_id;
 275
 276         if (rc > 0) {
 277                 rc = qctxt_adjust_qunit(obd, qctxt, id, 1, 0, NULL);
 278                 if (rc == -EDQUOT || rc == -EBUSY ||
 279                     rc == QUOTA_REQ_RETURNED || rc == -EAGAIN) {
 280                         CDEBUG(D_QUOTA, "rc: %d.\n", rc);
 281                         rc = 0;
 282                 }
 283                 if (rc)
 284                         CERROR("slave adjust block quota failed!(rc:%d)\n", rc);
 285         }
 286         RETURN(rc);
 287 }
 288 #endif /* __KERNEL__ */
 289 #endif