fs/orangefs/orangefs-mod.c

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * Changes by Acxiom Corporation to add proc file handler for pvfs2 client
   5  * parameters, Copyright Acxiom Corporation, 2005.
   6  *
   7  * See COPYING in top-level directory.
   8  */
   9
  10 #include "protocol.h"
  11 #include "orangefs-kernel.h"
  12 #include "orangefs-debugfs.h"
  13 #include "orangefs-sysfs.h"
  14
  15 /* ORANGEFS_VERSION is a ./configure define */
  16 #ifndef ORANGEFS_VERSION
  17 #define ORANGEFS_VERSION "upstream"
  18 #endif
  19
  20 /*
  21  * global variables declared here
  22  */
  23
  24 struct orangefs_stats orangefs_stats;
  25
  26 /* the size of the hash tables for ops in progress */
  27 int hash_table_size = 509;
  28
  29 static ulong module_parm_debug_mask;
  30 __u64 orangefs_gossip_debug_mask;
  31 int op_timeout_secs = ORANGEFS_DEFAULT_OP_TIMEOUT_SECS;
  32 int slot_timeout_secs = ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS;
  33 int orangefs_dcache_timeout_msecs = 50;
  34 int orangefs_getattr_timeout_msecs = 50;
  35
  36 MODULE_LICENSE("GPL");
  37 MODULE_AUTHOR("ORANGEFS Development Team");
  38 MODULE_DESCRIPTION("The Linux Kernel VFS interface to ORANGEFS");
  39 MODULE_PARM_DESC(module_parm_debug_mask, "debugging level (see orangefs-debug.h for values)");
  40 MODULE_PARM_DESC(op_timeout_secs, "Operation timeout in seconds");
  41 MODULE_PARM_DESC(slot_timeout_secs, "Slot timeout in seconds");
  42 MODULE_PARM_DESC(hash_table_size,
  43                  "size of hash table for operations in progress");
  44
  45 static struct file_system_type orangefs_fs_type = {
  46         .name = "pvfs2",
  47         .mount = orangefs_mount,
  48         .kill_sb = orangefs_kill_sb,
  49         .owner = THIS_MODULE,
  50 };
  51
  52 module_param(hash_table_size, int, 0);
  53 module_param(module_parm_debug_mask, ulong, 0644);
  54 module_param(op_timeout_secs, int, 0);
  55 module_param(slot_timeout_secs, int, 0);
  56
  57 /*
  58  * Blocks non-priority requests from being queued for servicing.  This
  59  * could be used for protecting the request list data structure, but
  60  * for now it's only being used to stall the op addition to the request
  61  * list
  62  */
  63 DEFINE_MUTEX(orangefs_request_mutex);
  64
  65 /* hash table for storing operations waiting for matching downcall */
  66 struct list_head *orangefs_htable_ops_in_progress;
  67 DEFINE_SPINLOCK(orangefs_htable_ops_in_progress_lock);
  68
  69 /* list for queueing upcall operations */
  70 LIST_HEAD(orangefs_request_list);
  71
  72 /* used to protect the above orangefs_request_list */
  73 DEFINE_SPINLOCK(orangefs_request_list_lock);
  74
  75 /* used for incoming request notification */
  76 DECLARE_WAIT_QUEUE_HEAD(orangefs_request_list_waitq);
  77
  78 static int __init orangefs_init(void)
  79 {
  80         int ret = -1;
  81         __u32 i = 0;
  82
  83         ret = bdi_init(&orangefs_backing_dev_info);
  84
  85         if (ret)
  86                 return ret;
  87
  88         if (op_timeout_secs < 0)
  89                 op_timeout_secs = 0;
  90
  91         if (slot_timeout_secs < 0)
  92                 slot_timeout_secs = 0;
  93
  94         /* initialize global book keeping data structures */
  95         ret = op_cache_initialize();
  96         if (ret < 0)
  97                 goto err;
  98
  99         ret = orangefs_inode_cache_initialize();
 100         if (ret < 0)
 101                 goto cleanup_op;
 102
 103         orangefs_htable_ops_in_progress =
 104             kcalloc(hash_table_size, sizeof(struct list_head), GFP_KERNEL);
 105         if (!orangefs_htable_ops_in_progress) {
 106                 gossip_err("Failed to initialize op hashtable");
 107                 ret = -ENOMEM;
 108                 goto cleanup_inode;
 109         }
 110
 111         /* initialize a doubly linked at each hash table index */
 112         for (i = 0; i < hash_table_size; i++)
 113                 INIT_LIST_HEAD(&orangefs_htable_ops_in_progress[i]);
 114
 115         ret = fsid_key_table_initialize();
 116         if (ret < 0)
 117                 goto cleanup_progress_table;
 118
 119         /*
 120          * Build the contents of /sys/kernel/debug/orangefs/debug-help
 121          * from the keywords in the kernel keyword/mask array.
 122          *
 123          * The keywords in the client keyword/mask array are
 124          * unknown at boot time.
 125          *
 126          * orangefs_prepare_debugfs_help_string will be used again
 127          * later to rebuild the debug-help-string after the client starts
 128          * and passes along the needed info. The argument signifies
 129          * which time orangefs_prepare_debugfs_help_string is being
 130          * called.
 131          */
 132         ret = orangefs_prepare_debugfs_help_string(1);
 133         if (ret)
 134                 goto cleanup_key_table;
 135
 136         ret = orangefs_debugfs_init(module_parm_debug_mask);
 137         if (ret)
 138                 goto debugfs_init_failed;
 139
 140         ret = orangefs_sysfs_init();
 141         if (ret)
 142                 goto sysfs_init_failed;
 143
 144         /* Initialize the orangefsdev subsystem. */
 145         ret = orangefs_dev_init();
 146         if (ret < 0) {
 147                 gossip_err("%s: could not initialize device subsystem %d!\n",
 148                            __func__,
 149                            ret);
 150                 goto cleanup_device;
 151         }
 152
 153         ret = register_filesystem(&orangefs_fs_type);
 154         if (ret == 0) {
 155                 pr_info("%s: module version %s loaded\n",
 156                         __func__,
 157                         ORANGEFS_VERSION);
 158                 ret = 0;
 159                 goto out;
 160         }
 161
 162         orangefs_sysfs_exit();
 163
 164 cleanup_device:
 165         orangefs_dev_cleanup();
 166
 167 sysfs_init_failed:
 168
 169 debugfs_init_failed:
 170         orangefs_debugfs_cleanup();
 171
 172 cleanup_key_table:
 173         fsid_key_table_finalize();
 174
 175 cleanup_progress_table:
 176         kfree(orangefs_htable_ops_in_progress);
 177
 178 cleanup_inode:
 179         orangefs_inode_cache_finalize();
 180
 181 cleanup_op:
 182         op_cache_finalize();
 183
 184 err:
 185         bdi_destroy(&orangefs_backing_dev_info);
 186
 187 out:
 188         return ret;
 189 }
 190
 191 static void __exit orangefs_exit(void)
 192 {
 193         int i = 0;
 194         gossip_debug(GOSSIP_INIT_DEBUG, "orangefs: orangefs_exit called\n");
 195
 196         unregister_filesystem(&orangefs_fs_type);
 197         orangefs_debugfs_cleanup();
 198         orangefs_sysfs_exit();
 199         fsid_key_table_finalize();
 200         orangefs_dev_cleanup();
 201         BUG_ON(!list_empty(&orangefs_request_list));
 202         for (i = 0; i < hash_table_size; i++)
 203                 BUG_ON(!list_empty(&orangefs_htable_ops_in_progress[i]));
 204
 205         orangefs_inode_cache_finalize();
 206         op_cache_finalize();
 207
 208         kfree(orangefs_htable_ops_in_progress);
 209
 210         bdi_destroy(&orangefs_backing_dev_info);
 211
 212         pr_info("orangefs: module version %s unloaded\n", ORANGEFS_VERSION);
 213 }
 214
 215 /*
 216  * What we do in this function is to walk the list of operations
 217  * that are in progress in the hash table and mark them as purged as well.
 218  */
 219 void purge_inprogress_ops(void)
 220 {
 221         int i;
 222
 223         for (i = 0; i < hash_table_size; i++) {
 224                 struct orangefs_kernel_op_s *op;
 225                 struct orangefs_kernel_op_s *next;
 226
 227                 spin_lock(&orangefs_htable_ops_in_progress_lock);
 228                 list_for_each_entry_safe(op,
 229                                          next,
 230                                          &orangefs_htable_ops_in_progress[i],
 231                                          list) {
 232                         set_op_state_purged(op);
 233                         gossip_debug(GOSSIP_DEV_DEBUG,
 234                                      "%s: op:%s: op_state:%d: process:%s:\n",
 235                                      __func__,
 236                                      get_opname_string(op),
 237                                      op->op_state,
 238                                      current->comm);
 239                 }
 240                 spin_unlock(&orangefs_htable_ops_in_progress_lock);
 241         }
 242 }
 243
 244 module_init(orangefs_init);
 245 module_exit(orangefs_exit);