lustre/lfsck/lfsck_bookmark.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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2012, 2013, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_bookmark.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #ifndef EXPORT_SYMTAB
  32 # define EXPORT_SYMTAB
  33 #endif
  34 #define DEBUG_SUBSYSTEM S_LFSCK
  35
  36 #include <lu_object.h>
  37 #include <dt_object.h>
  38 #include <lustre_fid.h>
  39 #include <lustre/lustre_user.h>
  40
  41 #include "lfsck_internal.h"
  42
  43 #define LFSCK_BOOKMARK_MAGIC    0x20130C1D
  44
  45 static const char lfsck_bookmark_name[] = "lfsck_bookmark";
  46
  47 static void lfsck_bookmark_le_to_cpu(struct lfsck_bookmark *des,
  48                                      struct lfsck_bookmark *src)
  49 {
  50         des->lb_magic = le32_to_cpu(src->lb_magic);
  51         des->lb_version = le16_to_cpu(src->lb_version);
  52         des->lb_param = le16_to_cpu(src->lb_param);
  53         des->lb_speed_limit = le32_to_cpu(src->lb_speed_limit);
  54 }
  55
  56 static void lfsck_bookmark_cpu_to_le(struct lfsck_bookmark *des,
  57                                      struct lfsck_bookmark *src)
  58 {
  59         des->lb_magic = cpu_to_le32(src->lb_magic);
  60         des->lb_version = cpu_to_le16(src->lb_version);
  61         des->lb_param = cpu_to_le16(src->lb_param);
  62         des->lb_speed_limit = cpu_to_le32(src->lb_speed_limit);
  63 }
  64
  65 static int lfsck_bookmark_load(const struct lu_env *env,
  66                                struct lfsck_instance *lfsck)
  67 {
  68         loff_t pos = 0;
  69         int    len = sizeof(struct lfsck_bookmark);
  70         int    rc;
  71
  72         rc = dt_record_read(env, lfsck->li_bookmark_obj,
  73                             lfsck_buf_get(env, &lfsck->li_bookmark_disk, len),
  74                             &pos);
  75         if (rc == 0) {
  76                 struct lfsck_bookmark *bm = &lfsck->li_bookmark_ram;
  77
  78                 lfsck_bookmark_le_to_cpu(bm, &lfsck->li_bookmark_disk);
  79                 if (bm->lb_magic != LFSCK_BOOKMARK_MAGIC) {
  80                         CWARN("%.16s: invalid lfsck_bookmark magic "
  81                               "0x%x != 0x%x\n", lfsck_lfsck2name(lfsck),
  82                               bm->lb_magic, LFSCK_BOOKMARK_MAGIC);
  83                         /* Process it as new lfsck_bookmark. */
  84                         rc = -ENODATA;
  85                 }
  86         } else {
  87                 if (rc == -EFAULT && pos == 0)
  88                         /* return -ENODATA for empty lfsck_bookmark. */
  89                         rc = -ENODATA;
  90                 else
  91                         CERROR("%.16s: fail to load lfsck_bookmark, "
  92                                "expected = %d, rc = %d\n",
  93                                lfsck_lfsck2name(lfsck), len, rc);
  94         }
  95         return rc;
  96 }
  97
  98 int lfsck_bookmark_store(const struct lu_env *env, struct lfsck_instance *lfsck)
  99 {
 100         struct thandle    *handle;
 101         struct dt_object  *obj    = lfsck->li_bookmark_obj;
 102         loff_t             pos    = 0;
 103         int                len    = sizeof(struct lfsck_bookmark);
 104         int                rc;
 105         ENTRY;
 106
 107         lfsck_bookmark_cpu_to_le(&lfsck->li_bookmark_disk,
 108                                  &lfsck->li_bookmark_ram);
 109         handle = dt_trans_create(env, lfsck->li_bottom);
 110         if (IS_ERR(handle)) {
 111                 rc = PTR_ERR(handle);
 112                 CERROR("%.16s: fail to create trans for storing "
 113                        "lfsck_bookmark: %d\n,", lfsck_lfsck2name(lfsck), rc);
 114                 RETURN(rc);
 115         }
 116
 117         rc = dt_declare_record_write(env, obj, len, 0, handle);
 118         if (rc != 0) {
 119                 CERROR("%.16s: fail to declare trans for storing "
 120                        "lfsck_bookmark: %d\n,", lfsck_lfsck2name(lfsck), rc);
 121                 GOTO(out, rc);
 122         }
 123
 124         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 125         if (rc != 0) {
 126                 CERROR("%.16s: fail to start trans for storing "
 127                        "lfsck_bookmark: %d\n,", lfsck_lfsck2name(lfsck), rc);
 128                 GOTO(out, rc);
 129         }
 130
 131         rc = dt_record_write(env, obj,
 132                              lfsck_buf_get(env, &lfsck->li_bookmark_disk, len),
 133                              &pos, handle);
 134         if (rc != 0)
 135                 CERROR("%.16s: fail to store lfsck_bookmark, expected = %d, "
 136                        "rc = %d\n", lfsck_lfsck2name(lfsck), len, rc);
 137
 138         GOTO(out, rc);
 139
 140 out:
 141         dt_trans_stop(env, lfsck->li_bottom, handle);
 142         return rc;
 143 }
 144
 145 static int lfsck_bookmark_init(const struct lu_env *env,
 146                                struct lfsck_instance *lfsck)
 147 {
 148         struct lfsck_bookmark *mb = &lfsck->li_bookmark_ram;
 149         int rc;
 150
 151         memset(mb, 0, sizeof(*mb));
 152         mb->lb_magic = LFSCK_BOOKMARK_MAGIC;
 153         mb->lb_version = LFSCK_VERSION_V2;
 154         mutex_lock(&lfsck->li_mutex);
 155         rc = lfsck_bookmark_store(env, lfsck);
 156         mutex_unlock(&lfsck->li_mutex);
 157         return rc;
 158 }
 159
 160 int lfsck_bookmark_setup(const struct lu_env *env,
 161                          struct lfsck_instance *lfsck)
 162 {
 163         struct dt_object *obj;
 164         int               rc;
 165         ENTRY;
 166
 167         obj = local_file_find_or_create(env, lfsck->li_los,
 168                                         lfsck->li_local_root,
 169                                         lfsck_bookmark_name,
 170                                         S_IFREG | S_IRUGO | S_IWUSR);
 171         if (IS_ERR(obj))
 172                 RETURN(PTR_ERR(obj));
 173
 174         lfsck->li_bookmark_obj = obj;
 175         rc = lfsck_bookmark_load(env, lfsck);
 176         if (rc == -ENODATA)
 177                 rc = lfsck_bookmark_init(env, lfsck);
 178
 179         RETURN(rc);
 180 }