fs/reiser4/plugin/cluster.c

   1 /* Copyright 2001, 2002, 2003 by Hans Reiser, licensing governed by reiser4/README */
   2
   3 /* Contains reiser4 cluster plugins (see
   4    http://www.namesys.com/cryptcompress_design.html
   5    "Concepts of clustering" for details). */
   6
   7 #include "plugin_header.h"
   8 #include "plugin.h"
   9 #include "../inode.h"
  10
  11 static int change_cluster(struct inode *inode,
  12                           reiser4_plugin * plugin,
  13                           pset_member memb)
  14 {
  15         assert("edward-1324", inode != NULL);
  16         assert("edward-1325", plugin != NULL);
  17         assert("edward-1326", is_reiser4_inode(inode));
  18         assert("edward-1327", plugin->h.type_id == REISER4_CLUSTER_PLUGIN_TYPE);
  19
  20         /* Can't change the cluster plugin for already existent regular files. */
  21         if (!plugin_of_group(inode_file_plugin(inode), REISER4_DIRECTORY_FILE))
  22                 return RETERR(-EINVAL);
  23
  24         /* If matches, nothing to change. */
  25         if (inode_hash_plugin(inode) != NULL &&
  26             inode_hash_plugin(inode)->h.id == plugin->h.id)
  27                 return 0;
  28
  29         return aset_set_unsafe(&reiser4_inode_data(inode)->pset,
  30                                PSET_CLUSTER, plugin);
  31 }
  32
  33 static reiser4_plugin_ops cluster_plugin_ops = {
  34         .init = NULL,
  35         .load = NULL,
  36         .save_len = NULL,
  37         .save = NULL,
  38         .change = &change_cluster
  39 };
  40
  41 #define SUPPORT_CLUSTER(SHIFT, ID, LABEL, DESC)                 \
  42         [CLUSTER_ ## ID ## _ID] = {                             \
  43                 .h = {                                          \
  44                         .type_id = REISER4_CLUSTER_PLUGIN_TYPE, \
  45                         .id = CLUSTER_ ## ID ## _ID,            \
  46                         .pops = &cluster_plugin_ops,            \
  47                         .label = LABEL,                         \
  48                         .desc = DESC,                           \
  49                         .linkage = {NULL, NULL}                 \
  50                 },                                              \
  51                 .shift = SHIFT                                  \
  52         }
  53
  54 cluster_plugin cluster_plugins[LAST_CLUSTER_ID] = {
  55         SUPPORT_CLUSTER(16, 64K, "64K", "Large"),
  56         SUPPORT_CLUSTER(15, 32K, "32K", "Big"),
  57         SUPPORT_CLUSTER(14, 16K, "16K", "Average"),
  58         SUPPORT_CLUSTER(13, 8K, "8K", "Small"),
  59         SUPPORT_CLUSTER(12, 4K, "4K", "Minimal")
  60 };
  61
  62 /*
  63   Local variables:
  64   c-indentation-style: "K&R"
  65   mode-name: "LC"
  66   c-basic-offset: 8
  67   tab-width: 8
  68   fill-column: 120
  69   scroll-step: 1
  70   End:
  71 */