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 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lu_object.h>
  34 #include <dt_object.h>
  35 #include <lustre_fid.h>
  36 #include <lustre/lustre_user.h>
  37
  38 #include "lfsck_internal.h"
  39
  40 #define LFSCK_BOOKMARK_MAGIC    0x20130C1D
  41
  42 static const char lfsck_bookmark_name[] = "lfsck_bookmark";
  43
  44 static void lfsck_bookmark_le_to_cpu(struct lfsck_bookmark *des,
  45                                      struct lfsck_bookmark *src)
  46 {
  47         des->lb_magic = le32_to_cpu(src->lb_magic);
  48         des->lb_version = le16_to_cpu(src->lb_version);
  49         des->lb_param = le16_to_cpu(src->lb_param);
  50         des->lb_speed_limit = le32_to_cpu(src->lb_speed_limit);
  51 }
  52
  53 static void lfsck_bookmark_cpu_to_le(struct lfsck_bookmark *des,
  54                                      struct lfsck_bookmark *src)
  55 {
  56         des->lb_magic = cpu_to_le32(src->lb_magic);
  57         des->lb_version = cpu_to_le16(src->lb_version);
  58         des->lb_param = cpu_to_le16(src->lb_param);
  59         des->lb_speed_limit = cpu_to_le32(src->lb_speed_limit);
  60 }
  61
  62 static int lfsck_bookmark_load(const struct lu_env *env,
  63                                struct lfsck_instance *lfsck)
  64 {
  65         loff_t pos = 0;
  66         int    len = sizeof(struct lfsck_bookmark);
  67         int    rc;
  68
  69         rc = dt_record_read(env, lfsck->li_bookmark_obj,
  70                             lfsck_buf_get(env, &lfsck->li_bookmark_disk, len),
  71                             &pos);
  72         if (rc == 0) {
  73                 struct lfsck_bookmark *bm = &lfsck->li_bookmark_ram;
  74
  75                 lfsck_bookmark_le_to_cpu(bm, &lfsck->li_bookmark_disk);
  76                 if (bm->lb_magic != LFSCK_BOOKMARK_MAGIC) {
  77                         CWARN("%s: invalid lfsck_bookmark magic %#x != %#x\n",
  78                               lfsck_lfsck2name(lfsck), bm->lb_magic,
  79                               LFSCK_BOOKMARK_MAGIC);
  80                         /* Process it as new lfsck_bookmark. */
  81                         rc = -ENODATA;
  82                 }
  83         } else {
  84                 if (rc == -EFAULT && pos == 0)
  85                         /* return -ENODATA for empty lfsck_bookmark. */
  86                         rc = -ENODATA;
  87                 else
  88                         CERROR("%s: fail to load lfsck_bookmark: "
  89                                "expected = %d, rc = %d\n",
  90                                lfsck_lfsck2name(lfsck), len, rc);
  91         }
  92         return rc;
  93 }
  94
  95 int lfsck_bookmark_store(const struct lu_env *env, struct lfsck_instance *lfsck)
  96 {
  97         struct thandle    *handle;
  98         struct dt_object  *obj    = lfsck->li_bookmark_obj;
  99         loff_t             pos    = 0;
 100         int                len    = sizeof(struct lfsck_bookmark);
 101         int                rc;
 102         ENTRY;
 103
 104         lfsck_bookmark_cpu_to_le(&lfsck->li_bookmark_disk,
 105                                  &lfsck->li_bookmark_ram);
 106         handle = dt_trans_create(env, lfsck->li_bottom);
 107         if (IS_ERR(handle)) {
 108                 rc = PTR_ERR(handle);
 109                 CERROR("%s: fail to create trans for storing lfsck_bookmark: "
 110                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 111                 RETURN(rc);
 112         }
 113
 114         rc = dt_declare_record_write(env, obj, len, 0, handle);
 115         if (rc != 0) {
 116                 CERROR("%s: fail to declare trans for storing lfsck_bookmark: "
 117                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 118                 GOTO(out, rc);
 119         }
 120
 121         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 122         if (rc != 0) {
 123                 CERROR("%s: fail to start trans for storing lfsck_bookmark: "
 124                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 125                 GOTO(out, rc);
 126         }
 127
 128         rc = dt_record_write(env, obj,
 129                              lfsck_buf_get(env, &lfsck->li_bookmark_disk, len),
 130                              &pos, handle);
 131         if (rc != 0)
 132                 CERROR("%s: fail to store lfsck_bookmark: expected = %d, "
 133                        "rc = %d\n", lfsck_lfsck2name(lfsck), len, rc);
 134
 135         GOTO(out, rc);
 136
 137 out:
 138         dt_trans_stop(env, lfsck->li_bottom, handle);
 139         return rc;
 140 }
 141
 142 static int lfsck_bookmark_init(const struct lu_env *env,
 143                                struct lfsck_instance *lfsck)
 144 {
 145         struct lfsck_bookmark *mb = &lfsck->li_bookmark_ram;
 146         int rc;
 147
 148         memset(mb, 0, sizeof(*mb));
 149         mb->lb_magic = LFSCK_BOOKMARK_MAGIC;
 150         mb->lb_version = LFSCK_VERSION_V2;
 151         mutex_lock(&lfsck->li_mutex);
 152         rc = lfsck_bookmark_store(env, lfsck);
 153         mutex_unlock(&lfsck->li_mutex);
 154         return rc;
 155 }
 156
 157 int lfsck_bookmark_setup(const struct lu_env *env,
 158                          struct lfsck_instance *lfsck)
 159 {
 160         struct dt_object *root;
 161         struct dt_object *obj;
 162         int               rc;
 163         ENTRY;
 164
 165         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
 166         if (IS_ERR(root))
 167                 RETURN(PTR_ERR(root));
 168
 169         if (unlikely(!dt_try_as_dir(env, root))) {
 170                 lu_object_put(env, &root->do_lu);
 171
 172                 RETURN(-ENOTDIR);
 173         }
 174
 175         obj = local_file_find_or_create(env, lfsck->li_los, root,
 176                                         lfsck_bookmark_name,
 177                                         S_IFREG | S_IRUGO | S_IWUSR);
 178         lu_object_put(env, &root->do_lu);
 179         if (IS_ERR(obj))
 180                 RETURN(PTR_ERR(obj));
 181
 182         lfsck->li_bookmark_obj = obj;
 183         rc = lfsck_bookmark_load(env, lfsck);
 184         if (rc == -ENODATA)
 185                 rc = lfsck_bookmark_init(env, lfsck);
 186
 187         RETURN(rc);
 188 }