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         des->lb_async_windows = le16_to_cpu(src->lb_async_windows);
  52         fid_le_to_cpu(&des->lb_lpf_fid, &src->lb_lpf_fid);
  53         fid_le_to_cpu(&des->lb_last_fid, &src->lb_last_fid);
  54 }
  55
  56 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         des->lb_async_windows = cpu_to_le16(src->lb_async_windows);
  64         fid_cpu_to_le(&des->lb_lpf_fid, &src->lb_lpf_fid);
  65         fid_cpu_to_le(&des->lb_last_fid, &src->lb_last_fid);
  66 }
  67
  68 static int lfsck_bookmark_load(const struct lu_env *env,
  69                                struct lfsck_instance *lfsck)
  70 {
  71         loff_t pos = 0;
  72         int    len = sizeof(struct lfsck_bookmark);
  73         int    rc;
  74
  75         rc = dt_record_read(env, lfsck->li_bookmark_obj,
  76                             lfsck_buf_get(env, &lfsck->li_bookmark_disk, len),
  77                             &pos);
  78         if (rc == 0) {
  79                 struct lfsck_bookmark *bm = &lfsck->li_bookmark_ram;
  80
  81                 lfsck_bookmark_le_to_cpu(bm, &lfsck->li_bookmark_disk);
  82                 if (bm->lb_magic != LFSCK_BOOKMARK_MAGIC) {
  83                         CWARN("%s: invalid lfsck_bookmark magic %#x != %#x\n",
  84                               lfsck_lfsck2name(lfsck), bm->lb_magic,
  85                               LFSCK_BOOKMARK_MAGIC);
  86                         /* Process it as new lfsck_bookmark. */
  87                         rc = -ENODATA;
  88                 }
  89         } else {
  90                 if (rc == -EFAULT && pos == 0)
  91                         /* return -ENODATA for empty lfsck_bookmark. */
  92                         rc = -ENODATA;
  93                 else
  94                         CERROR("%s: fail to load lfsck_bookmark: "
  95                                "expected = %d, rc = %d\n",
  96                                lfsck_lfsck2name(lfsck), len, rc);
  97         }
  98         return rc;
  99 }
 100
 101 int lfsck_bookmark_store(const struct lu_env *env, struct lfsck_instance *lfsck)
 102 {
 103         struct thandle    *handle;
 104         struct dt_object  *obj    = lfsck->li_bookmark_obj;
 105         loff_t             pos    = 0;
 106         int                len    = sizeof(struct lfsck_bookmark);
 107         int                rc;
 108         ENTRY;
 109
 110         lfsck_bookmark_cpu_to_le(&lfsck->li_bookmark_disk,
 111                                  &lfsck->li_bookmark_ram);
 112         handle = dt_trans_create(env, lfsck->li_bottom);
 113         if (IS_ERR(handle)) {
 114                 rc = PTR_ERR(handle);
 115                 CERROR("%s: fail to create trans for storing lfsck_bookmark: "
 116                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 117                 RETURN(rc);
 118         }
 119
 120         rc = dt_declare_record_write(env, obj, len, 0, handle);
 121         if (rc != 0) {
 122                 CERROR("%s: fail to declare trans for storing lfsck_bookmark: "
 123                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 124                 GOTO(out, rc);
 125         }
 126
 127         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 128         if (rc != 0) {
 129                 CERROR("%s: fail to start trans for storing lfsck_bookmark: "
 130                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 131                 GOTO(out, rc);
 132         }
 133
 134         rc = dt_record_write(env, obj,
 135                              lfsck_buf_get(env, &lfsck->li_bookmark_disk, len),
 136                              &pos, handle);
 137         if (rc != 0)
 138                 CERROR("%s: fail to store lfsck_bookmark: expected = %d, "
 139                        "rc = %d\n", lfsck_lfsck2name(lfsck), len, rc);
 140
 141         GOTO(out, rc);
 142
 143 out:
 144         dt_trans_stop(env, lfsck->li_bottom, handle);
 145         return rc;
 146 }
 147
 148 static int lfsck_bookmark_init(const struct lu_env *env,
 149                                struct lfsck_instance *lfsck)
 150 {
 151         struct lfsck_bookmark *mb = &lfsck->li_bookmark_ram;
 152         int rc;
 153
 154         memset(mb, 0, sizeof(*mb));
 155         mb->lb_magic = LFSCK_BOOKMARK_MAGIC;
 156         mb->lb_version = LFSCK_VERSION_V2;
 157         mb->lb_async_windows = LFSCK_ASYNC_WIN_DEFAULT;
 158         mutex_lock(&lfsck->li_mutex);
 159         rc = lfsck_bookmark_store(env, lfsck);
 160         mutex_unlock(&lfsck->li_mutex);
 161         return rc;
 162 }
 163
 164 int lfsck_bookmark_setup(const struct lu_env *env,
 165                          struct lfsck_instance *lfsck)
 166 {
 167         struct dt_object *root;
 168         struct dt_object *obj;
 169         int               rc;
 170         ENTRY;
 171
 172         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
 173         if (IS_ERR(root))
 174                 RETURN(PTR_ERR(root));
 175
 176         if (unlikely(!dt_try_as_dir(env, root))) {
 177                 lu_object_put(env, &root->do_lu);
 178
 179                 RETURN(-ENOTDIR);
 180         }
 181
 182         obj = local_file_find_or_create(env, lfsck->li_los, root,
 183                                         lfsck_bookmark_name,
 184                                         S_IFREG | S_IRUGO | S_IWUSR);
 185         lu_object_put(env, &root->do_lu);
 186         if (IS_ERR(obj))
 187                 RETURN(PTR_ERR(obj));
 188
 189         lfsck->li_bookmark_obj = obj;
 190         rc = lfsck_bookmark_load(env, lfsck);
 191         if (rc == -ENODATA)
 192                 rc = lfsck_bookmark_init(env, lfsck);
 193
 194         RETURN(rc);
 195 }