fs/orangefs/pvfs2-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 "pvfs2-kernel.h"
  12 #include "pvfs2-debugfs.h"
  13 #include "pvfs2-sysfs.h"
  14
  15 /* ORANGEFS_VERSION is a ./configure define */
  16 #ifndef ORANGEFS_VERSION
  17 #define ORANGEFS_VERSION "Unknown"
  18 #endif
  19
  20 /*
  21  * global variables declared here
  22  */
  23
  24 /* array of client debug keyword/mask values */
  25 struct client_debug_mask *cdm_array;
  26 int cdm_element_count;
  27
  28 char kernel_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN] = "none";
  29 char client_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN];
  30 char client_debug_array_string[ORANGEFS_MAX_DEBUG_STRING_LEN];
  31
  32 char *debug_help_string;
  33 int help_string_initialized;
  34 struct dentry *help_file_dentry;
  35 struct dentry *client_debug_dentry;
  36 struct dentry *debug_dir;
  37 int client_verbose_index;
  38 int client_all_index;
  39 struct orangefs_stats g_orangefs_stats;
  40
  41 /* the size of the hash tables for ops in progress */
  42 int hash_table_size = 509;
  43
  44 static ulong module_parm_debug_mask;
  45 __u64 gossip_debug_mask;
  46 struct client_debug_mask client_debug_mask = { NULL, 0, 0 };
  47 unsigned int kernel_mask_set_mod_init; /* implicitly false */
  48 int op_timeout_secs = ORANGEFS_DEFAULT_OP_TIMEOUT_SECS;
  49 int slot_timeout_secs = ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS;
  50
  51 MODULE_LICENSE("GPL");
  52 MODULE_AUTHOR("ORANGEFS Development Team");
  53 MODULE_DESCRIPTION("The Linux Kernel VFS interface to ORANGEFS");
  54 MODULE_PARM_DESC(module_parm_debug_mask, "debugging level (see orangefs-debug.h for values)");
  55 MODULE_PARM_DESC(op_timeout_secs, "Operation timeout in seconds");
  56 MODULE_PARM_DESC(slot_timeout_secs, "Slot timeout in seconds");
  57 MODULE_PARM_DESC(hash_table_size,
  58                  "size of hash table for operations in progress");
  59
  60 static struct file_system_type orangefs_fs_type = {
  61         .name = "pvfs2",
  62         .mount = orangefs_mount,
  63         .kill_sb = orangefs_kill_sb,
  64         .owner = THIS_MODULE,
  65 };
  66
  67 module_param(hash_table_size, int, 0);
  68 module_param(module_parm_debug_mask, ulong, 0644);
  69 module_param(op_timeout_secs, int, 0);
  70 module_param(slot_timeout_secs, int, 0);
  71
  72 /* synchronizes the request device file */
  73 struct mutex devreq_mutex;
  74
  75 /*
  76  * Blocks non-priority requests from being queued for servicing.  This
  77  * could be used for protecting the request list data structure, but
  78  * for now it's only being used to stall the op addition to the request
  79  * list
  80  */
  81 struct mutex request_mutex;
  82
  83 /* hash table for storing operations waiting for matching downcall */
  84 struct list_head *htable_ops_in_progress;
  85 DEFINE_SPINLOCK(htable_ops_in_progress_lock);
  86
  87 /* list for queueing upcall operations */
  88 LIST_HEAD(orangefs_request_list);
  89
  90 /* used to protect the above orangefs_request_list */
  91 DEFINE_SPINLOCK(orangefs_request_list_lock);
  92
  93 /* used for incoming request notification */
  94 DECLARE_WAIT_QUEUE_HEAD(orangefs_request_list_waitq);
  95
  96 static int __init orangefs_init(void)
  97 {
  98         int ret = -1;
  99         __u32 i = 0;
 100
 101         /* convert input debug mask to a 64-bit unsigned integer */
 102         gossip_debug_mask = (unsigned long long) module_parm_debug_mask;
 103
 104         /*
 105          * set the kernel's gossip debug string; invalid mask values will
 106          * be ignored.
 107          */
 108         debug_mask_to_string(&gossip_debug_mask, 0);
 109
 110         /* remove any invalid values from the mask */
 111         debug_string_to_mask(kernel_debug_string, &gossip_debug_mask, 0);
 112
 113         /*
 114          * if the mask has a non-zero value, then indicate that the mask
 115          * was set when the kernel module was loaded.  The orangefs dev ioctl
 116          * command will look at this boolean to determine if the kernel's
 117          * debug mask should be overwritten when the client-core is started.
 118          */
 119         if (gossip_debug_mask != 0)
 120                 kernel_mask_set_mod_init = true;
 121
 122         /* print information message to the system log */
 123         pr_info("orangefs: orangefs_init called with debug mask: :%s: :%llx:\n",
 124                kernel_debug_string,
 125                (unsigned long long)gossip_debug_mask);
 126
 127         ret = bdi_init(&orangefs_backing_dev_info);
 128
 129         if (ret)
 130                 return ret;
 131
 132         if (op_timeout_secs < 0)
 133                 op_timeout_secs = 0;
 134
 135         if (slot_timeout_secs < 0)
 136                 slot_timeout_secs = 0;
 137
 138         /* initialize global book keeping data structures */
 139         ret = op_cache_initialize();
 140         if (ret < 0)
 141                 goto err;
 142
 143         ret = dev_req_cache_initialize();
 144         if (ret < 0)
 145                 goto cleanup_op;
 146
 147         ret = orangefs_inode_cache_initialize();
 148         if (ret < 0)
 149                 goto cleanup_req;
 150
 151         ret = kiocb_cache_initialize();
 152         if (ret  < 0)
 153                 goto cleanup_inode;
 154
 155         /* Initialize the pvfsdev subsystem. */
 156         ret = orangefs_dev_init();
 157         if (ret < 0) {
 158                 gossip_err("orangefs: could not initialize device subsystem %d!\n",
 159                            ret);
 160                 goto cleanup_kiocb;
 161         }
 162
 163         mutex_init(&devreq_mutex);
 164         mutex_init(&request_mutex);
 165
 166         htable_ops_in_progress =
 167             kcalloc(hash_table_size, sizeof(struct list_head), GFP_KERNEL);
 168         if (!htable_ops_in_progress) {
 169                 gossip_err("Failed to initialize op hashtable");
 170                 ret = -ENOMEM;
 171                 goto cleanup_device;
 172         }
 173
 174         /* initialize a doubly linked at each hash table index */
 175         for (i = 0; i < hash_table_size; i++)
 176                 INIT_LIST_HEAD(&htable_ops_in_progress[i]);
 177
 178         ret = fsid_key_table_initialize();
 179         if (ret < 0)
 180                 goto cleanup_progress_table;
 181
 182         /*
 183          * Build the contents of /sys/kernel/debug/orangefs/debug-help
 184          * from the keywords in the kernel keyword/mask array.
 185          *
 186          * The keywords in the client keyword/mask array are
 187          * unknown at boot time.
 188          *
 189          * orangefs_prepare_debugfs_help_string will be used again
 190          * later to rebuild the debug-help file after the client starts
 191          * and passes along the needed info. The argument signifies
 192          * which time orangefs_prepare_debugfs_help_string is being
 193          * called.
 194          *
 195          */
 196         ret = orangefs_prepare_debugfs_help_string(1);
 197         if (ret)
 198                 goto out;
 199
 200         orangefs_debugfs_init();
 201         orangefs_kernel_debug_init();
 202         orangefs_sysfs_init();
 203
 204         ret = register_filesystem(&orangefs_fs_type);
 205         if (ret == 0) {
 206                 pr_info("orangefs: module version %s loaded\n", ORANGEFS_VERSION);
 207                 return 0;
 208         }
 209
 210         orangefs_debugfs_cleanup();
 211         orangefs_sysfs_exit();
 212         fsid_key_table_finalize();
 213
 214 cleanup_progress_table:
 215         kfree(htable_ops_in_progress);
 216
 217 cleanup_device:
 218         orangefs_dev_cleanup();
 219
 220 cleanup_kiocb:
 221         kiocb_cache_finalize();
 222
 223 cleanup_inode:
 224         orangefs_inode_cache_finalize();
 225
 226 cleanup_req:
 227         dev_req_cache_finalize();
 228
 229 cleanup_op:
 230         op_cache_finalize();
 231
 232 err:
 233         bdi_destroy(&orangefs_backing_dev_info);
 234
 235 out:
 236         return ret;
 237 }
 238
 239 static void __exit orangefs_exit(void)
 240 {
 241         int i = 0;
 242         struct orangefs_kernel_op_s *cur_op = NULL;
 243
 244         gossip_debug(GOSSIP_INIT_DEBUG, "orangefs: orangefs_exit called\n");
 245
 246         unregister_filesystem(&orangefs_fs_type);
 247         orangefs_debugfs_cleanup();
 248         orangefs_sysfs_exit();
 249         fsid_key_table_finalize();
 250         orangefs_dev_cleanup();
 251         /* clear out all pending upcall op requests */
 252         spin_lock(&orangefs_request_list_lock);
 253         while (!list_empty(&orangefs_request_list)) {
 254                 cur_op = list_entry(orangefs_request_list.next,
 255                                     struct orangefs_kernel_op_s,
 256                                     list);
 257                 list_del(&cur_op->list);
 258                 gossip_debug(GOSSIP_INIT_DEBUG,
 259                              "Freeing unhandled upcall request type %d\n",
 260                              cur_op->upcall.type);
 261                 op_release(cur_op);
 262         }
 263         spin_unlock(&orangefs_request_list_lock);
 264
 265         for (i = 0; i < hash_table_size; i++)
 266                 while (!list_empty(&htable_ops_in_progress[i])) {
 267                         cur_op = list_entry(htable_ops_in_progress[i].next,
 268                                             struct orangefs_kernel_op_s,
 269                                             list);
 270                         op_release(cur_op);
 271                 }
 272
 273         kiocb_cache_finalize();
 274         orangefs_inode_cache_finalize();
 275         dev_req_cache_finalize();
 276         op_cache_finalize();
 277
 278         kfree(htable_ops_in_progress);
 279
 280         bdi_destroy(&orangefs_backing_dev_info);
 281
 282         pr_info("orangefs: module version %s unloaded\n", ORANGEFS_VERSION);
 283 }
 284
 285 /*
 286  * What we do in this function is to walk the list of operations
 287  * that are in progress in the hash table and mark them as purged as well.
 288  */
 289 void purge_inprogress_ops(void)
 290 {
 291         int i;
 292
 293         for (i = 0; i < hash_table_size; i++) {
 294                 struct orangefs_kernel_op_s *op;
 295                 struct orangefs_kernel_op_s *next;
 296
 297                 list_for_each_entry_safe(op,
 298                                          next,
 299                                          &htable_ops_in_progress[i],
 300                                          list) {
 301                         spin_lock(&op->lock);
 302                         gossip_debug(GOSSIP_INIT_DEBUG,
 303                                 "pvfs2-client-core: purging in-progress op tag "
 304                                 "%llu %s\n",
 305                                 llu(op->tag),
 306                                 get_opname_string(op));
 307                         set_op_state_purged(op);
 308                         spin_unlock(&op->lock);
 309                         wake_up_interruptible(&op->waitq);
 310                 }
 311         }
 312 }
 313
 314 module_init(orangefs_init);
 315 module_exit(orangefs_exit);