lustre/include/linux/lustre_lib.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001 Cluster File Systems, Inc. <braam@clusterfs.com>
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  * Basic Lustre library routines.
  22  *
  23  */
  24
  25 #ifndef _LUSTRE_LIB_H
  26 #define _LUSTRE_LIB_H
  27
  28 #ifndef __KERNEL__
  29 # include <string.h>
  30 #else
  31 # include <asm/semaphore.h>
  32 #endif
  33 #include <linux/portals_lib.h>
  34 #include <linux/lustre_idl.h>
  35
  36 #ifdef __KERNEL__
  37 /* l_net.c */
  38 struct ptlrpc_request;
  39 struct obd_device;
  40 int target_handle_connect(struct ptlrpc_request *req);
  41 int target_handle_disconnect(struct ptlrpc_request *req);
  42 int client_obd_connect(struct lustre_handle *conn, struct obd_device *obd);
  43 int client_obd_disconnect(struct lustre_handle *conn);
  44 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf);
  45 int client_obd_cleanup(struct obd_device * obddev);
  46 struct client_obd *client_conn2cli(struct lustre_handle *conn);
  47
  48 /* l_lock.c */
  49 struct lustre_lock {
  50         int l_depth;
  51         struct task_struct *l_owner;
  52         struct semaphore l_sem;
  53         spinlock_t l_spin;
  54 };
  55
  56 void l_lock_init(struct lustre_lock *);
  57 void l_lock(struct lustre_lock *);
  58 void l_unlock(struct lustre_lock *);
  59
  60
  61 /* page.c */
  62 inline void lustre_put_page(struct page *page);
  63 struct page *lustre_get_page_read(struct inode *dir, unsigned long index);
  64 struct page *lustre_get_page_write(struct inode *dir, unsigned long index);
  65 int lustre_commit_write(struct page *page, unsigned from, unsigned to);
  66 void set_page_clean(struct page *page);
  67 void set_page_dirty(struct page *page);
  68
  69 /* simple.c */
  70 struct obd_run_ctxt;
  71 void push_ctxt(struct obd_run_ctxt *save, struct obd_run_ctxt *new);
  72 void pop_ctxt(struct obd_run_ctxt *saved);
  73 #ifdef OBD_CTXT_DEBUG
  74 #define OBD_SET_CTXT_MAGIC(ctxt) (ctxt)->magic = OBD_RUN_CTXT_MAGIC
  75 #else
  76 #define OBD_SET_CTXT_MAGIC(ctxt) do {} while(0)
  77 #endif
  78 struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode);
  79 int lustre_fread(struct file *file, char *str, int len, loff_t *off);
  80 int lustre_fwrite(struct file *file, const char *str, int len, loff_t *off);
  81 int lustre_fsync(struct file *file);
  82
  83 static inline void l_dput(struct dentry *de)
  84 {
  85         if (!de || IS_ERR(de))
  86                 return;
  87         shrink_dcache_parent(de);
  88         dput(de);
  89 }
  90
  91 static inline void ll_sleep(int t)
  92 {
  93         set_current_state(TASK_INTERRUPTIBLE);
  94         schedule_timeout(t * HZ);
  95         set_current_state(TASK_RUNNING);
  96 }
  97 #endif
  98
  99 /* FIXME: This needs to validate pointers and cookies */
 100 static inline void *lustre_handle2object(struct lustre_handle *handle)
 101 {
 102         if (handle)
 103                 return (void *)(unsigned long)(handle->addr);
 104         return NULL;
 105 }
 106
 107 static inline void ldlm_object2handle(void *object, struct lustre_handle *handle)
 108 {
 109         handle->addr = (__u64)(unsigned long)object;
 110 }
 111
 112 struct obd_statfs;
 113 struct statfs;
 114 void obd_statfs_pack(struct obd_statfs *osfs, struct statfs *sfs);
 115 void obd_statfs_unpack(struct obd_statfs *osfs, struct statfs *sfs);
 116
 117 #include <linux/portals_lib.h>
 118
 119 /*
 120  *   OBD IOCTLS
 121  */
 122 #define OBD_IOCTL_VERSION 0x00010001
 123
 124 struct obd_ioctl_data {
 125         uint32_t ioc_len;
 126         uint32_t ioc_version;
 127
 128         uint64_t ioc_addr;
 129         uint64_t ioc_cookie;
 130         uint32_t ioc_conn1;
 131         uint32_t ioc_conn2;
 132
 133         struct obdo ioc_obdo1;
 134         struct obdo ioc_obdo2;
 135
 136         obd_size         ioc_count;
 137         obd_off          ioc_offset;
 138         uint32_t         ioc_dev;
 139         uint32_t         ____padding;
 140
 141         /* buffers the kernel will treat as user pointers */
 142         uint32_t ioc_plen1;
 143         char    *ioc_pbuf1;
 144         uint32_t ioc_plen2;
 145         char    *ioc_pbuf2;
 146
 147         /* two inline buffers */
 148         uint32_t ioc_inllen1;
 149         char    *ioc_inlbuf1;
 150         uint32_t ioc_inllen2;
 151         char    *ioc_inlbuf2;
 152         uint32_t ioc_inllen3;
 153         char    *ioc_inlbuf3;
 154
 155         char    ioc_bulk[0];
 156 };
 157
 158 struct obd_ioctl_hdr {
 159         uint32_t ioc_len;
 160         uint32_t ioc_version;
 161 };
 162
 163 static inline int obd_ioctl_packlen(struct obd_ioctl_data *data)
 164 {
 165         int len = size_round(sizeof(struct obd_ioctl_data));
 166         len += size_round(data->ioc_inllen1);
 167         len += size_round(data->ioc_inllen2);
 168         len += size_round(data->ioc_inllen3);
 169         return len;
 170 }
 171
 172
 173 static inline int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
 174 {
 175         if (data->ioc_len > (1<<30)) {
 176                 printk("OBD ioctl: ioc_len larger than 1<<30\n");
 177                 return 1;
 178         }
 179         if (data->ioc_inllen1 > (1<<30)) {
 180                 printk("OBD ioctl: ioc_inllen1 larger than 1<<30\n");
 181                 return 1;
 182         }
 183         if (data->ioc_inllen2 > (1<<30)) {
 184                 printk("OBD ioctl: ioc_inllen2 larger than 1<<30\n");
 185                 return 1;
 186         }
 187
 188         if (data->ioc_inllen3 > (1<<30)) {
 189                 printk("OBD ioctl: ioc_inllen3 larger than 1<<30\n");
 190                 return 1;
 191         }
 192         if (data->ioc_inlbuf1 && !data->ioc_inllen1) {
 193                 printk("OBD ioctl: inlbuf1 pointer but 0 length\n");
 194                 return 1;
 195         }
 196         if (data->ioc_inlbuf2 && !data->ioc_inllen2) {
 197                 printk("OBD ioctl: inlbuf2 pointer but 0 length\n");
 198                 return 1;
 199         }
 200         if (data->ioc_inlbuf3 && !data->ioc_inllen3) {
 201                 printk("OBD ioctl: inlbuf3 pointer but 0 length\n");
 202                 return 1;
 203         }
 204         if (data->ioc_pbuf1 && !data->ioc_plen1) {
 205                 printk("OBD ioctl: pbuf1 pointer but 0 length\n");
 206                 return 1;
 207         }
 208         if (data->ioc_pbuf2 && !data->ioc_plen2) {
 209                 printk("OBD ioctl: pbuf2 pointer but 0 length\n");
 210                 return 1;
 211         }
 212         /*
 213         if (data->ioc_inllen1 && !data->ioc_inlbuf1) {
 214                 printk("OBD ioctl: inllen1 set but NULL pointer\n");
 215                 return 1;
 216         }
 217         if (data->ioc_inllen2 && !data->ioc_inlbuf2) {
 218                 printk("OBD ioctl: inllen2 set but NULL pointer\n");
 219                 return 1;
 220         }
 221         if (data->ioc_inllen3 && !data->ioc_inlbuf3) {
 222                 printk("OBD ioctl: inllen3 set but NULL pointer\n");
 223                 return 1;
 224         }
 225         */
 226         if (data->ioc_plen1 && !data->ioc_pbuf1) {
 227                 printk("OBD ioctl: plen1 set but NULL pointer\n");
 228                 return 1;
 229         }
 230         if (data->ioc_plen2 && !data->ioc_pbuf2) {
 231                 printk("OBD ioctl: plen2 set but NULL pointer\n");
 232                 return 1;
 233         }
 234         if (obd_ioctl_packlen(data) != data->ioc_len ) {
 235                 printk("OBD ioctl: packlen exceeds ioc_len\n");
 236                 return 1;
 237         }
 238 #if 0
 239         if (data->ioc_inllen1 &&
 240             data->ioc_bulk[data->ioc_inllen1 - 1] != '\0') {
 241                 printk("OBD ioctl: inlbuf1 not 0 terminated\n");
 242                 return 1;
 243         }
 244         if (data->ioc_inllen2 &&
 245             data->ioc_bulk[size_round(data->ioc_inllen1) + data->ioc_inllen2 - 1] != '\0') {
 246                 printk("OBD ioctl: inlbuf2 not 0 terminated\n");
 247                 return 1;
 248         }
 249         if (data->ioc_inllen3 &&
 250             data->ioc_bulk[size_round(data->ioc_inllen1) + size_round(data->ioc_inllen2)
 251                            + data->ioc_inllen3 - 1] != '\0') {
 252                 printk("OBD ioctl: inlbuf3 not 0 terminated\n");
 253                 return 1;
 254         }
 255 #endif
 256         return 0;
 257 }
 258
 259 #ifndef __KERNEL__
 260 static inline int obd_ioctl_pack(struct obd_ioctl_data *data, char **pbuf,
 261                                  int max)
 262 {
 263         char *ptr;
 264         struct obd_ioctl_data *overlay;
 265         data->ioc_len = obd_ioctl_packlen(data);
 266         data->ioc_version = OBD_IOCTL_VERSION;
 267
 268         if (*pbuf && obd_ioctl_packlen(data) > max)
 269                 return 1;
 270         if (*pbuf == NULL) {
 271                 *pbuf = malloc(data->ioc_len);
 272         }
 273         if (!*pbuf)
 274                 return 1;
 275         overlay = (struct obd_ioctl_data *)*pbuf;
 276         memcpy(*pbuf, data, sizeof(*data));
 277
 278         ptr = overlay->ioc_bulk;
 279         if (data->ioc_inlbuf1)
 280                 LOGL(data->ioc_inlbuf1, data->ioc_inllen1, ptr);
 281         if (data->ioc_inlbuf2)
 282                 LOGL(data->ioc_inlbuf2, data->ioc_inllen2, ptr);
 283         if (data->ioc_inlbuf3)
 284                 LOGL(data->ioc_inlbuf3, data->ioc_inllen3, ptr);
 285         if (obd_ioctl_is_invalid(overlay))
 286                 return 1;
 287
 288         return 0;
 289 }
 290
 291 #else
 292
 293 #include <linux/obd_support.h>
 294
 295 /* buffer MUST be at least the size of obd_ioctl_hdr */
 296 static inline int obd_ioctl_getdata(char **buf, int *len, void *arg)
 297 {
 298         struct obd_ioctl_hdr hdr;
 299         struct obd_ioctl_data *data;
 300         int err;
 301         ENTRY;
 302
 303
 304         err = copy_from_user(&hdr, (void *)arg, sizeof(hdr));
 305         if ( err ) {
 306                 EXIT;
 307                 return err;
 308         }
 309
 310         if (hdr.ioc_version != OBD_IOCTL_VERSION) {
 311                 printk("OBD: version mismatch kernel vs application\n");
 312                 return -EINVAL;
 313         }
 314
 315         if (hdr.ioc_len > 8192) {
 316                 printk("OBD: user buffer exceeds 8192 max buffer\n");
 317                 return -EINVAL;
 318         }
 319
 320         if (hdr.ioc_len < sizeof(struct obd_ioctl_data)) {
 321                 printk("OBD: user buffer too small for ioctl\n");
 322                 return -EINVAL;
 323         }
 324
 325         OBD_ALLOC(*buf, hdr.ioc_len);
 326         if (!*buf) {
 327                 CERROR("Cannot allocate control buffer of len %d\n",
 328                        hdr.ioc_len);
 329                 RETURN(-EINVAL);
 330         }
 331         *len = hdr.ioc_len;
 332         data = (struct obd_ioctl_data *)*buf;
 333
 334         err = copy_from_user(*buf, (void *)arg, hdr.ioc_len);
 335         if ( err ) {
 336                 EXIT;
 337                 return err;
 338         }
 339
 340         if (obd_ioctl_is_invalid(data)) {
 341                 printk("OBD: ioctl not correctly formatted\n");
 342                 return -EINVAL;
 343         }
 344
 345         if (data->ioc_inllen1) {
 346                 data->ioc_inlbuf1 = &data->ioc_bulk[0];
 347         }
 348
 349         if (data->ioc_inllen2) {
 350                 data->ioc_inlbuf2 = &data->ioc_bulk[0] + size_round(data->ioc_inllen1);
 351         }
 352
 353         if (data->ioc_inllen3) {
 354                 data->ioc_inlbuf3 = &data->ioc_bulk[0] + size_round(data->ioc_inllen1) +
 355                         size_round(data->ioc_inllen2);
 356         }
 357
 358         EXIT;
 359         return 0;
 360 }
 361 #endif
 362
 363 #define OBD_IOC_CREATE                 _IOR ('f', 101, long)
 364 #define OBD_IOC_SETUP                  _IOW ('f', 102, long)
 365 #define OBD_IOC_CLEANUP                _IO  ('f', 103      )
 366 #define OBD_IOC_DESTROY                _IOW ('f', 104, long)
 367 #define OBD_IOC_PREALLOCATE            _IOWR('f', 105, long)
 368 #define OBD_IOC_DEC_USE_COUNT          _IO  ('f', 106      )
 369 #define OBD_IOC_SETATTR                _IOW ('f', 107, long)
 370 #define OBD_IOC_GETATTR                _IOR ('f', 108, long)
 371 #define OBD_IOC_READ                   _IOWR('f', 109, long)
 372 #define OBD_IOC_WRITE                  _IOWR('f', 110, long)
 373 #define OBD_IOC_CONNECT                _IOR ('f', 111, long)
 374 #define OBD_IOC_DISCONNECT             _IOW ('f', 112, long)
 375 #define OBD_IOC_STATFS                 _IOWR('f', 113, long)
 376 #define OBD_IOC_SYNC                   _IOR ('f', 114, long)
 377 #define OBD_IOC_READ2                  _IOWR('f', 115, long)
 378 #define OBD_IOC_FORMAT                 _IOWR('f', 116, long)
 379 #define OBD_IOC_PARTITION              _IOWR('f', 117, long)
 380 #define OBD_IOC_ATTACH                 _IOWR('f', 118, long)
 381 #define OBD_IOC_DETACH                 _IOWR('f', 119, long)
 382 #define OBD_IOC_COPY                   _IOWR('f', 120, long)
 383 #define OBD_IOC_MIGR                   _IOWR('f', 121, long)
 384 #define OBD_IOC_PUNCH                  _IOWR('f', 122, long)
 385 #define OBD_IOC_DEVICE                 _IOWR('f', 123, long)
 386 #define OBD_IOC_MODULE_DEBUG           _IOWR('f', 124, long)
 387 #define OBD_IOC_BRW_READ               _IOWR('f', 125, long)
 388 #define OBD_IOC_BRW_WRITE              _IOWR('f', 126, long)
 389 #define OBD_IOC_NAME2DEV               _IOWR('f', 127, long)
 390 #define OBD_IOC_NEWDEV                 _IOWR('f', 128, long)
 391 #define OBD_IOC_LIST                   _IOWR('f', 129, long)
 392 #define OBD_IOC_UUID2DEV               _IOWR('f', 130, long)
 393
 394 #define OBD_IOC_RECOVD_NEWCONN         _IOWR('f', 131, long)
 395 #define OBD_IOC_LOV_CONFIG             _IOWR('f', 132, long)
 396
 397 #define OBD_IOC_DEC_FS_USE_COUNT       _IO  ('f', 133      )
 398
 399
 400
 401
 402
 403 /* XXX this should be one mask-check */
 404 #define l_killable_pending(task)                                               \
 405 (sigismember(&(task->pending.signal), SIGKILL) ||                              \
 406  sigismember(&(task->pending.signal), SIGINT) ||                               \
 407  sigismember(&(task->pending.signal), SIGTERM))
 408
 409 /*
 410  * Like wait_event_interruptible, but we're only interruptible by KILL, INT, or
 411  * TERM.
 412  *
 413  * XXXshaver These are going away soon, I hope.
 414  */
 415 #define __l_wait_event_killable(wq, condition, ret)                          \
 416 do {                                                                         \
 417         wait_queue_t __wait;                                                 \
 418         init_waitqueue_entry(&__wait, current);                              \
 419                                                                              \
 420         add_wait_queue(&wq, &__wait);                                        \
 421         for (;;) {                                                           \
 422                 set_current_state(TASK_INTERRUPTIBLE);                       \
 423                 if (condition)                                               \
 424                         break;                                               \
 425                 if (!signal_pending(current) ||                              \
 426                     !l_killable_pending(current)) {                          \
 427                         schedule();                                          \
 428                         continue;                                            \
 429                 }                                                            \
 430                 ret = -ERESTARTSYS;                                          \
 431                 break;                                                       \
 432         }                                                                    \
 433         current->state = TASK_RUNNING;                                       \
 434         remove_wait_queue(&wq, &__wait);                                     \
 435 } while(0)
 436
 437 #define l_wait_event_killable(wq, condition)                            \
 438 ({                                                                      \
 439         int __ret = 0;                                                  \
 440         if (!(condition))                                               \
 441                 __l_wait_event_killable(wq, condition, __ret);          \
 442         __ret;                                                          \
 443 })
 444
 445 #define __l_wait_event_timeout(wq, condition, timeout, ret)                   \
 446 do {                                                                          \
 447         wait_queue_t __wait;                                                  \
 448         init_waitqueue_entry(&__wait, current);                               \
 449                                                                               \
 450         add_wait_queue(&wq, &__wait);                                         \
 451         for (;;) {                                                            \
 452                 set_current_state(TASK_INTERRUPTIBLE);                        \
 453                 if (condition)                                                \
 454                         break;                                                \
 455                 if (timeout)                                                  \
 456                         schedule_timeout(timeout);                            \
 457                 else                                                          \
 458                         schedule();                                           \
 459         }                                                                     \
 460         current->state = TASK_RUNNING;                                        \
 461         remove_wait_queue(&wq, &__wait);                                      \
 462 } while(0)
 463
 464 #define l_wait_event_timeout(wq, condition, timeout)                          \
 465 ({                                                                            \
 466         int __ret = 0;                                                        \
 467         if (!(condition))                                                     \
 468                 __l_wait_event_timeout(wq, condition, timeout, __ret);        \
 469         __ret;                                                                \
 470 })
 471
 472 #endif /* _LUSTRE_LIB_H */