drivers/staging/lustre/lustre/lov/lov_merge.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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  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_LOV
  38
  39 #include <linux/libcfs/libcfs.h>
  40
  41 #include <obd_class.h>
  42 #include <obd_lov.h>
  43
  44 #include "lov_internal.h"
  45
  46 /** Merge the lock value block(&lvb) attributes and KMS from each of the
  47  * stripes in a file into a single lvb. It is expected that the caller
  48  * initializes the current atime, mtime, ctime to avoid regressing a more
  49  * uptodate time on the local client.
  50  */
  51 int lov_merge_lvb_kms(struct lov_stripe_md *lsm,
  52                       struct ost_lvb *lvb, __u64 *kms_place)
  53 {
  54         __u64 size = 0;
  55         __u64 kms = 0;
  56         __u64 blocks = 0;
  57         obd_time current_mtime = lvb->lvb_mtime;
  58         obd_time current_atime = lvb->lvb_atime;
  59         obd_time current_ctime = lvb->lvb_ctime;
  60         int i;
  61         int rc = 0;
  62
  63         LASSERT(spin_is_locked(&lsm->lsm_lock));
  64         LASSERT(lsm->lsm_lock_owner == current_pid());
  65
  66         CDEBUG(D_INODE, "MDT ID "DOSTID" initial value: s="LPU64" m="LPU64
  67                " a="LPU64" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi),
  68                lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime,
  69                lvb->lvb_blocks);
  70         for (i = 0; i < lsm->lsm_stripe_count; i++) {
  71                 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
  72                 obd_size lov_size, tmpsize;
  73
  74                 if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks)) {
  75                         rc = OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
  76                         continue;
  77                 }
  78
  79                 tmpsize = loi->loi_kms;
  80                 lov_size = lov_stripe_size(lsm, tmpsize, i);
  81                 if (lov_size > kms)
  82                         kms = lov_size;
  83
  84                 if (loi->loi_lvb.lvb_size > tmpsize)
  85                         tmpsize = loi->loi_lvb.lvb_size;
  86
  87                 lov_size = lov_stripe_size(lsm, tmpsize, i);
  88                 if (lov_size > size)
  89                         size = lov_size;
  90                 /* merge blocks, mtime, atime */
  91                 blocks += loi->loi_lvb.lvb_blocks;
  92                 if (loi->loi_lvb.lvb_mtime > current_mtime)
  93                         current_mtime = loi->loi_lvb.lvb_mtime;
  94                 if (loi->loi_lvb.lvb_atime > current_atime)
  95                         current_atime = loi->loi_lvb.lvb_atime;
  96                 if (loi->loi_lvb.lvb_ctime > current_ctime)
  97                         current_ctime = loi->loi_lvb.lvb_ctime;
  98
  99                 CDEBUG(D_INODE, "MDT ID "DOSTID" on OST[%u]: s="LPU64" m="LPU64
 100                        " a="LPU64" c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi),
 101                        loi->loi_ost_idx, loi->loi_lvb.lvb_size,
 102                        loi->loi_lvb.lvb_mtime, loi->loi_lvb.lvb_atime,
 103                        loi->loi_lvb.lvb_ctime, loi->loi_lvb.lvb_blocks);
 104         }
 105
 106         *kms_place = kms;
 107         lvb->lvb_size = size;
 108         lvb->lvb_blocks = blocks;
 109         lvb->lvb_mtime = current_mtime;
 110         lvb->lvb_atime = current_atime;
 111         lvb->lvb_ctime = current_ctime;
 112         RETURN(rc);
 113 }
 114
 115 /** Merge the lock value block(&lvb) attributes from each of the stripes in a
 116  * file into a single lvb. It is expected that the caller initializes the
 117  * current atime, mtime, ctime to avoid regressing a more uptodate time on
 118  * the local client.
 119  *
 120  * If \a kms_only is set then we do not consider the recently seen size (rss)
 121  * when updating the known minimum size (kms).  Even when merging RSS, we will
 122  * take the KMS value if it's larger.  This prevents getattr from stomping on
 123  * dirty cached pages which extend the file size. */
 124 int lov_merge_lvb(struct obd_export *exp,
 125                   struct lov_stripe_md *lsm, struct ost_lvb *lvb, int kms_only)
 126 {
 127         int   rc;
 128         __u64 kms;
 129
 130         ENTRY;
 131         lov_stripe_lock(lsm);
 132         rc = lov_merge_lvb_kms(lsm, lvb, &kms);
 133         lov_stripe_unlock(lsm);
 134         if (kms_only)
 135                 lvb->lvb_size = kms;
 136
 137         CDEBUG(D_INODE, "merged for ID "DOSTID" s="LPU64" m="LPU64" a="LPU64
 138                " c="LPU64" b="LPU64"\n", POSTID(&lsm->lsm_oi), lvb->lvb_size,
 139                lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime, lvb->lvb_blocks);
 140         RETURN(rc);
 141 }
 142
 143 /* Must be called under the lov_stripe_lock() */
 144 int lov_adjust_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
 145                    obd_off size, int shrink)
 146 {
 147         struct lov_oinfo *loi;
 148         int stripe = 0;
 149         __u64 kms;
 150         ENTRY;
 151
 152         LASSERT(spin_is_locked(&lsm->lsm_lock));
 153         LASSERT(lsm->lsm_lock_owner == current_pid());
 154
 155         if (shrink) {
 156                 for (; stripe < lsm->lsm_stripe_count; stripe++) {
 157                         struct lov_oinfo *loi = lsm->lsm_oinfo[stripe];
 158                         kms = lov_size_to_stripe(lsm, size, stripe);
 159                         CDEBUG(D_INODE,
 160                                "stripe %d KMS %sing "LPU64"->"LPU64"\n",
 161                                stripe, kms > loi->loi_kms ? "increas":"shrink",
 162                                loi->loi_kms, kms);
 163                         loi_kms_set(loi, loi->loi_lvb.lvb_size = kms);
 164                 }
 165                 RETURN(0);
 166         }
 167
 168         if (size > 0)
 169                 stripe = lov_stripe_number(lsm, size - 1);
 170         kms = lov_size_to_stripe(lsm, size, stripe);
 171         loi = lsm->lsm_oinfo[stripe];
 172
 173         CDEBUG(D_INODE, "stripe %d KMS %sincreasing "LPU64"->"LPU64"\n",
 174                stripe, kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms);
 175         if (kms > loi->loi_kms)
 176                 loi_kms_set(loi, kms);
 177
 178         RETURN(0);
 179 }
 180
 181 void lov_merge_attrs(struct obdo *tgt, struct obdo *src, obd_valid valid,
 182                      struct lov_stripe_md *lsm, int stripeno, int *set)
 183 {
 184         valid &= src->o_valid;
 185
 186         if (*set) {
 187                 if (valid & OBD_MD_FLSIZE) {
 188                         /* this handles sparse files properly */
 189                         obd_size lov_size;
 190
 191                         lov_size = lov_stripe_size(lsm, src->o_size, stripeno);
 192                         if (lov_size > tgt->o_size)
 193                                 tgt->o_size = lov_size;
 194                 }
 195                 if (valid & OBD_MD_FLBLOCKS)
 196                         tgt->o_blocks += src->o_blocks;
 197                 if (valid & OBD_MD_FLBLKSZ)
 198                         tgt->o_blksize += src->o_blksize;
 199                 if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime)
 200                         tgt->o_ctime = src->o_ctime;
 201                 if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime)
 202                         tgt->o_mtime = src->o_mtime;
 203                 if (valid & OBD_MD_FLDATAVERSION)
 204                         tgt->o_data_version += src->o_data_version;
 205         } else {
 206                 memcpy(tgt, src, sizeof(*tgt));
 207                 tgt->o_oi = lsm->lsm_oi;
 208                 if (valid & OBD_MD_FLSIZE)
 209                         tgt->o_size = lov_stripe_size(lsm, src->o_size,
 210                                                       stripeno);
 211         }
 212
 213         /* data_version needs to be valid on all stripes to be correct! */
 214         if (!(valid & OBD_MD_FLDATAVERSION))
 215                 tgt->o_valid &= ~OBD_MD_FLDATAVERSION;
 216
 217         *set += 1;
 218 }