lustre/lmv/lmv_objmgr.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef EXPORT_SYMTAB
  23 # define EXPORT_SYMTAB
  24 #endif
  25 #define DEBUG_SUBSYSTEM S_LMV
  26 #ifdef __KERNEL__
  27 #include <linux/slab.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/pagemap.h>
  32 #include <asm/div64.h>
  33 #include <linux/seq_file.h>
  34 #else
  35 #include <liblustre.h>
  36 #endif
  37
  38 #include <linux/obd_support.h>
  39 #include <linux/lustre_lib.h>
  40 #include <linux/lustre_net.h>
  41 #include <linux/lustre_idl.h>
  42 #include <linux/lustre_dlm.h>
  43 #include <linux/lustre_mds.h>
  44 #include <linux/obd_class.h>
  45 #include <linux/obd_ost.h>
  46 #include <linux/lprocfs_status.h>
  47 #include <linux/lustre_fsfilt.h>
  48 #include <linux/obd_lmv.h>
  49 #include "lmv_internal.h"
  50
  51
  52 LIST_HEAD(lmv_obj_list);
  53 spinlock_t lmv_obj_list_lock = SPIN_LOCK_UNLOCKED;
  54
  55 struct lmv_obj *lmv_grab_obj(struct obd_device *obd,
  56                              struct ll_fid *fid, int create)
  57 {
  58         struct lmv_obd *lmv = &obd->u.lmv;
  59         struct list_head *cur;
  60         struct lmv_obj *obj, *obj2;
  61
  62         spin_lock(&lmv_obj_list_lock);
  63         list_for_each(cur, &lmv_obj_list) {
  64                 obj = list_entry(cur, struct lmv_obj, list);
  65                 if (obj->fid.mds == fid->mds && obj->fid.id == fid->id &&
  66                                 obj->fid.generation == fid->generation) {
  67                         atomic_inc(&obj->count);
  68                         spin_unlock(&lmv_obj_list_lock);
  69                         RETURN(obj);
  70                 }
  71         }
  72         spin_unlock(&lmv_obj_list_lock);
  73
  74         if (!create)
  75                 RETURN(NULL);
  76
  77         /* no such object yet, allocate and initialize them */
  78         OBD_ALLOC(obj, sizeof(*obj));
  79         if (!obj)
  80                 RETURN(NULL);
  81         atomic_set(&obj->count, 0);
  82         obj->fid = *fid;
  83         obj->obd = obd;
  84
  85         OBD_ALLOC(obj->objs, sizeof(struct lmv_inode) * lmv->desc.ld_tgt_count);
  86         if (!obj->objs) {
  87                 OBD_FREE(obj, sizeof(*obj));
  88                 RETURN(NULL);
  89         }
  90         memset(obj->objs, 0,  sizeof(struct lmv_inode) * lmv->desc.ld_tgt_count);
  91
  92         spin_lock(&lmv_obj_list_lock);
  93         list_for_each(cur, &lmv_obj_list) {
  94                 obj2 = list_entry(cur, struct lmv_obj, list);
  95                 if (obj2->fid.mds == fid->mds && obj2->fid.id == fid->id &&
  96                                 obj2->fid.generation == fid->generation) {
  97                         /* someone created it already */
  98                         OBD_FREE(obj->objs,
  99                                   sizeof(struct lmv_inode) * lmv->desc.ld_tgt_count);
 100                         OBD_FREE(obj, sizeof(*obj));
 101
 102                         atomic_inc(&obj2->count);
 103                         spin_unlock(&lmv_obj_list_lock);
 104                         RETURN(obj2);
 105                 }
 106         }
 107         list_add(&obj->list, &lmv_obj_list);
 108         CDEBUG(D_OTHER, "new obj in lmv cache: %lu/%lu/%lu\n",
 109                (unsigned long) fid->mds, (unsigned long) fid->id,
 110                (unsigned long) fid->generation);
 111         spin_unlock(&lmv_obj_list_lock);
 112
 113         RETURN(obj);
 114
 115 }
 116
 117 void lmv_put_obj(struct lmv_obj *obj)
 118 {
 119         if (!obj)
 120                 return;
 121         if (atomic_dec_and_test(&obj->count)) {
 122                 CDEBUG(D_OTHER, "last reference to %lu/%lu/%lu\n",
 123                        (unsigned long) obj->fid.mds,
 124                        (unsigned long) obj->fid.id,
 125                        (unsigned long) obj->fid.generation);
 126         }
 127 }
 128
 129 void lmv_cleanup_objs(struct obd_device *obd)
 130 {
 131         struct lmv_obd *lmv = &obd->u.lmv;
 132         struct list_head *cur, *tmp;
 133         struct lmv_obj *obj;
 134
 135         spin_lock(&lmv_obj_list_lock);
 136         list_for_each_safe(cur, tmp, &lmv_obj_list) {
 137                 obj = list_entry(cur, struct lmv_obj, list);
 138                 if (obj->obd != obd)
 139                         continue;
 140
 141                 list_del(&obj->list);
 142                 OBD_FREE(obj->objs,
 143                          sizeof(struct lmv_inode) * lmv->desc.ld_tgt_count);
 144                 OBD_FREE(obj, sizeof(*obj));
 145         }
 146         spin_unlock(&lmv_obj_list_lock);
 147 }
 148
 149 int lmv_create_obj_from_attrs(struct obd_export *exp,
 150                               struct ll_fid *fid, struct mea *mea)
 151 {
 152         struct obd_device *obd = exp->exp_obd;
 153         struct lmv_obd *lmv = &obd->u.lmv;
 154         struct ptlrpc_request *req = NULL;
 155         struct lmv_obj *obj;
 156         struct lustre_md md;
 157         int mealen, i, rc = 0;
 158         ENTRY;
 159
 160         CDEBUG(D_OTHER, "get mea for %lu/%lu/%lu and create lmv obj\n",
 161                (unsigned long) fid->mds, (unsigned long) fid->id,
 162                (unsigned long) fid->generation);
 163
 164         if (!mea) {
 165                 unsigned long valid;
 166
 167                 CDEBUG(D_OTHER, "mea isn't passed in, get it now\n");
 168                 mealen = MEA_SIZE_LMV(lmv);
 169
 170                 /* time to update mea of parent fid */
 171                 i = fid->mds;
 172                 md.mea = NULL;
 173
 174                 valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA;
 175                 rc = md_getattr(lmv->tgts[fid->mds].ltd_exp, fid,
 176                                 valid, mealen, &req);
 177                 if (rc) {
 178                         CERROR("md_getattr() failed, rc = %d\n", rc);
 179                         GOTO(cleanup, rc);
 180                 }
 181
 182                 rc = mdc_req2lustre_md(exp, req, 0, NULL, &md);
 183                 if (rc) {
 184                         CERROR("mdc_req2lustre_md() failed, rc = %d\n", rc);
 185                         GOTO(cleanup, rc);
 186                 }
 187
 188                 if (md.mea == NULL)
 189                         GOTO(cleanup, rc = -ENODATA);
 190
 191                 mea = md.mea;
 192         }
 193
 194         /* got mea, now create obj for it */
 195         obj = lmv_grab_obj(obd, fid, 1);
 196         if (!obj)
 197                 GOTO(cleanup, rc = -ENOMEM);
 198
 199         obj->objcount = mea->mea_count;
 200         /* put all fids in */
 201         for (i = 0; i < mea->mea_count; i++) {
 202                 CDEBUG(D_OTHER, "subobj %lu/%lu/%lu\n",
 203                        (unsigned long) mea->mea_fids[i].mds,
 204                        (unsigned long) mea->mea_fids[i].id,
 205                        (unsigned long) mea->mea_fids[i].generation);
 206                 obj->objs[i].fid = mea->mea_fids[i];
 207         }
 208
 209 cleanup:
 210         if (req)
 211                 ptlrpc_req_finished(req);
 212         RETURN(rc);
 213 }
 214
 215