lustre/fld/lproc_fld.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/fld/lproc_fld.c
   5  *  FLD (FIDs Location Database)
   6  *
   7  *  Copyright (c) 2006 Cluster File Systems, Inc.
   8  *   Author: Yury Umanets <umka@clusterfs.com>
   9  *
  10  *   This file is part of the Lustre file system, http://www.lustre.org
  11  *   Lustre is a trademark of Cluster File Systems, Inc.
  12  *
  13  *   You may have signed or agreed to another license before downloading
  14  *   this software.  If so, you are bound by the terms and conditions
  15  *   of that agreement, and the following does not apply to you.  See the
  16  *   LICENSE file included with this distribution for more information.
  17  *
  18  *   If you did not agree to a different license, then this copy of Lustre
  19  *   is open source software; you can redistribute it and/or modify it
  20  *   under the terms of version 2 of the GNU General Public License as
  21  *   published by the Free Software Foundation.
  22  *
  23  *   In either case, Lustre is distributed in the hope that it will be
  24  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  25  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *   license text for more details.
  27  */
  28
  29 #ifndef EXPORT_SYMTAB
  30 # define EXPORT_SYMTAB
  31 #endif
  32 #define DEBUG_SUBSYSTEM S_FLD
  33
  34 #ifdef __KERNEL__
  35 # include <libcfs/libcfs.h>
  36 # include <linux/module.h>
  37 #else /* __KERNEL__ */
  38 # include <liblustre.h>
  39 #endif
  40
  41 #include <obd.h>
  42 #include <obd_class.h>
  43 #include <dt_object.h>
  44 #include <md_object.h>
  45 #include <obd_support.h>
  46 #include <lustre_req_layout.h>
  47 #include <lustre_fld.h>
  48 #include "fld_internal.h"
  49
  50 #ifdef LPROCFS
  51 static int
  52 fld_proc_read_targets(char *page, char **start, off_t off,
  53                       int count, int *eof, void *data)
  54 {
  55         struct lu_client_fld *fld = (struct lu_client_fld *)data;
  56         struct lu_fld_target *target;
  57         int total = 0, rc;
  58         ENTRY;
  59
  60         LASSERT(fld != NULL);
  61
  62         spin_lock(&fld->lcf_lock);
  63         list_for_each_entry(target,
  64                             &fld->lcf_targets, ft_chain)
  65         {
  66                 rc = snprintf(page, count, "%s\n",
  67                               fld_target_name(target));
  68                 page += rc;
  69                 count -= rc;
  70                 total += rc;
  71                 if (count == 0)
  72                         break;
  73         }
  74         spin_unlock(&fld->lcf_lock);
  75         RETURN(total);
  76 }
  77
  78 static int
  79 fld_proc_read_hash(char *page, char **start, off_t off,
  80                    int count, int *eof, void *data)
  81 {
  82         struct lu_client_fld *fld = (struct lu_client_fld *)data;
  83         int rc;
  84         ENTRY;
  85
  86         LASSERT(fld != NULL);
  87
  88         spin_lock(&fld->lcf_lock);
  89         rc = snprintf(page, count, "%s\n",
  90                       fld->lcf_hash->fh_name);
  91         spin_unlock(&fld->lcf_lock);
  92
  93         RETURN(rc);
  94 }
  95
  96 static int
  97 fld_proc_write_hash(struct file *file, const char *buffer,
  98                     unsigned long count, void *data)
  99 {
 100         struct lu_client_fld *fld = (struct lu_client_fld *)data;
 101         struct lu_fld_hash *hash = NULL;
 102         int i;
 103         ENTRY;
 104
 105         LASSERT(fld != NULL);
 106
 107         for (i = 0; fld_hash[i].fh_name != NULL; i++) {
 108                 if (count != strlen(fld_hash[i].fh_name))
 109                         continue;
 110
 111                 if (!strncmp(fld_hash[i].fh_name, buffer, count)) {
 112                         hash = &fld_hash[i];
 113                         break;
 114                 }
 115         }
 116
 117         if (hash != NULL) {
 118                 spin_lock(&fld->lcf_lock);
 119                 fld->lcf_hash = hash;
 120                 spin_unlock(&fld->lcf_lock);
 121
 122                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 123                        fld->lcf_name, hash->fh_name);
 124         }
 125
 126         RETURN(count);
 127 }
 128
 129 static int
 130 fld_proc_write_cache_flush(struct file *file, const char *buffer,
 131                            unsigned long count, void *data)
 132 {
 133         struct lu_client_fld *fld = (struct lu_client_fld *)data;
 134         ENTRY;
 135
 136         LASSERT(fld != NULL);
 137
 138         fld_cache_flush(fld->lcf_cache);
 139
 140         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 141
 142         RETURN(count);
 143 }
 144
 145 struct lprocfs_vars fld_server_proc_list[] = {
 146         { NULL }};
 147
 148 struct lprocfs_vars fld_client_proc_list[] = {
 149         { "targets",     fld_proc_read_targets, NULL, NULL },
 150         { "hash",        fld_proc_read_hash, fld_proc_write_hash, NULL },
 151         { "cache_flush", NULL, fld_proc_write_cache_flush, NULL },
 152         { NULL }};
 153 #endif