lustre/include/linux/lustre_compat25.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2003 Cluster File Systems, Inc.
   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  */
  22
  23 #ifndef _LINUX_COMPAT25_H
  24 #define _LINUX_COMPAT25_H
  25
  26 #ifdef __KERNEL__
  27
  28 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,9)
  29 #error sorry, lustre requires at least linux kernel 2.6.9 or later
  30 #endif
  31
  32 #include <libcfs/linux/portals_compat25.h>
  33
  34 #include <linux/lustre_patchless_compat.h>
  35
  36 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
  37 struct ll_iattr {
  38         struct iattr    iattr;
  39         unsigned int    ia_attr_flags;
  40 };
  41 #else
  42 #define ll_iattr iattr
  43 #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14) */
  44
  45 #ifndef HAVE_SET_FS_PWD
  46 static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
  47                 struct dentry *dentry)
  48 {
  49         struct dentry *old_pwd;
  50         struct vfsmount *old_pwdmnt;
  51
  52         write_lock(&fs->lock);
  53         old_pwd = fs->pwd;
  54         old_pwdmnt = fs->pwdmnt;
  55         fs->pwdmnt = mntget(mnt);
  56         fs->pwd = dget(dentry);
  57         write_unlock(&fs->lock);
  58
  59         if (old_pwd) {
  60                 dput(old_pwd);
  61                 mntput(old_pwdmnt);
  62         }
  63 }
  64 #else
  65 #define ll_set_fs_pwd set_fs_pwd
  66 #endif /* HAVE_SET_FS_PWD */
  67
  68 /*
  69  * set ATTR_BLOCKS to a high value to avoid any risk of collision with other
  70  * ATTR_* attributes (see bug 13828)
  71  */
  72 #define ATTR_BLOCKS    (1 << 27)
  73
  74 #if HAVE_INODE_I_MUTEX
  75 #define UNLOCK_INODE_MUTEX(inode) do {mutex_unlock(&(inode)->i_mutex); } while(0)
  76 #define LOCK_INODE_MUTEX(inode) do {mutex_lock(&(inode)->i_mutex); } while(0)
  77 #define TRYLOCK_INODE_MUTEX(inode) mutex_trylock(&(inode)->i_mutex)
  78 #else
  79 #define UNLOCK_INODE_MUTEX(inode) do {up(&(inode)->i_sem); } while(0)
  80 #define LOCK_INODE_MUTEX(inode) do {down(&(inode)->i_sem); } while(0)
  81 #define TRYLOCK_INODE_MUTEX(inode) (!down_trylock(&(inode)->i_sem))
  82 #endif /* HAVE_INODE_I_MUTEX */
  83
  84 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)
  85 #define d_child d_u.d_child
  86 #define d_rcu d_u.d_rcu
  87 #endif
  88
  89 #ifdef HAVE_DQUOTOFF_MUTEX
  90 #define UNLOCK_DQONOFF_MUTEX(dqopt) do {mutex_unlock(&(dqopt)->dqonoff_mutex); } while(0)
  91 #define LOCK_DQONOFF_MUTEX(dqopt) do {mutex_lock(&(dqopt)->dqonoff_mutex); } while(0)
  92 #else
  93 #define UNLOCK_DQONOFF_MUTEX(dqopt) do {up(&(dqopt)->dqonoff_sem); } while(0)
  94 #define LOCK_DQONOFF_MUTEX(dqopt) do {down(&(dqopt)->dqonoff_sem); } while(0)
  95 #endif /* HAVE_DQUOTOFF_MUTEX */
  96
  97 #define current_ngroups current->group_info->ngroups
  98 #define current_groups current->group_info->small_block
  99
 100 #ifndef page_private
 101 #define page_private(page) ((page)->private)
 102 #define set_page_private(page, v) ((page)->private = (v))
 103 #endif
 104
 105 #ifndef HAVE_GFP_T
 106 #define gfp_t int
 107 #endif
 108
 109 #define lock_dentry(___dentry)          spin_lock(&(___dentry)->d_lock)
 110 #define unlock_dentry(___dentry)        spin_unlock(&(___dentry)->d_lock)
 111
 112 #define ll_kernel_locked()      kernel_locked()
 113
 114 /*
 115  * OBD need working random driver, thus all our
 116  * initialization routines must be called after device
 117  * driver initialization
 118  */
 119 #ifndef MODULE
 120 #undef module_init
 121 #define module_init(a)     late_initcall(a)
 122 #endif
 123
 124 /* XXX our code should be using the 2.6 calls, not the other way around */
 125 #define TryLockPage(page)               TestSetPageLocked(page)
 126 #define Page_Uptodate(page)             PageUptodate(page)
 127 #define ll_redirty_page(page)           set_page_dirty(page)
 128
 129 #define KDEVT_INIT(val)                 (val)
 130
 131 #define LTIME_S(time)                   (time.tv_sec)
 132 #define ll_path_lookup                  path_lookup
 133 #define ll_permission(inode,mask,nd)    permission(inode,mask,nd)
 134
 135 #define ll_pgcache_lock(mapping)          spin_lock(&mapping->page_lock)
 136 #define ll_pgcache_unlock(mapping)        spin_unlock(&mapping->page_lock)
 137 #define ll_call_writepage(inode, page)  \
 138                                 (inode)->i_mapping->a_ops->writepage(page, NULL)
 139 #define ll_invalidate_inode_pages(inode) \
 140                                 invalidate_inode_pages((inode)->i_mapping)
 141 #define ll_truncate_complete_page(page) \
 142                                 truncate_complete_page(page->mapping, page)
 143
 144 #define ll_vfs_create(a,b,c,d)          vfs_create(a,b,c,d)
 145 #define ll_dev_t                        dev_t
 146 #define kdev_t                          dev_t
 147 #define to_kdev_t(dev)                  (dev)
 148 #define kdev_t_to_nr(dev)               (dev)
 149 #define val_to_kdev(dev)                (dev)
 150 #define ILOOKUP(sb, ino, test, data)    ilookup5(sb, ino, test, data);
 151
 152 #include <linux/writeback.h>
 153
 154 static inline int cleanup_group_info(void)
 155 {
 156         struct group_info *ginfo;
 157
 158         ginfo = groups_alloc(0);
 159         if (!ginfo)
 160                 return -ENOMEM;
 161
 162         set_current_groups(ginfo);
 163         put_group_info(ginfo);
 164
 165         return 0;
 166 }
 167
 168 #define __set_page_ll_data(page, llap) \
 169         do {       \
 170                 page_cache_get(page); \
 171                 SetPagePrivate(page); \
 172                 set_page_private(page, (unsigned long)llap); \
 173         } while (0)
 174 #define __clear_page_ll_data(page) \
 175         do {       \
 176                 ClearPagePrivate(page); \
 177                 set_page_private(page, 0); \
 178                 page_cache_release(page); \
 179         } while(0)
 180
 181 #define kiobuf bio
 182
 183 #include <linux/proc_fs.h>
 184
 185 #if !defined(HAVE_D_REHASH_COND) && defined(HAVE___D_REHASH)
 186 #define d_rehash_cond(dentry, lock) __d_rehash(dentry, lock)
 187 extern void __d_rehash(struct dentry *dentry, int lock);
 188 #endif
 189
 190 #if !defined(HAVE_D_MOVE_LOCKED) && defined(HAVE___D_MOVE)
 191 #define d_move_locked(dentry, target) __d_move(dentry, target)
 192 extern void __d_move(struct dentry *dentry, struct dentry *target);
 193 #endif
 194
 195 #ifdef HAVE_CAN_SLEEP_ARG
 196 #define ll_flock_lock_file_wait(file, lock, can_sleep) \
 197         flock_lock_file_wait(file, lock, can_sleep)
 198 #else
 199 #define ll_flock_lock_file_wait(file, lock, can_sleep) \
 200         flock_lock_file_wait(file, lock)
 201 #endif
 202
 203 #define CheckWriteback(page, cmd) \
 204         ((!PageWriteback(page) && (cmd & OBD_BRW_READ)) || \
 205          (PageWriteback(page) && (cmd & OBD_BRW_WRITE)))
 206
 207 #ifdef HAVE_PAGE_LIST
 208 static inline int mapping_has_pages(struct address_space *mapping)
 209 {
 210         int rc = 1;
 211
 212         ll_pgcache_lock(mapping);
 213         if (list_empty(&mapping->dirty_pages) &&
 214             list_empty(&mapping->clean_pages) &&
 215             list_empty(&mapping->locked_pages)) {
 216                 rc = 0;
 217         }
 218         ll_pgcache_unlock(mapping);
 219
 220         return rc;
 221 }
 222 #else
 223 static inline int mapping_has_pages(struct address_space *mapping)
 224 {
 225         return mapping->nrpages > 0;
 226 }
 227 #endif
 228
 229 #ifdef HAVE_KIOBUF_KIO_BLOCKS
 230 #define KIOBUF_GET_BLOCKS(k) ((k)->kio_blocks)
 231 #else
 232 #define KIOBUF_GET_BLOCKS(k) ((k)->blocks)
 233 #endif
 234
 235 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,7))
 236 #define ll_set_dflags(dentry, flags) do { dentry->d_vfs_flags |= flags; } while(0)
 237 #define ll_vfs_symlink(dir, dentry, path, mode) vfs_symlink(dir, dentry, path)
 238 #else
 239 #define ll_set_dflags(dentry, flags) do { \
 240                 spin_lock(&dentry->d_lock); \
 241                 dentry->d_flags |= flags; \
 242                 spin_unlock(&dentry->d_lock); \
 243         } while(0)
 244 #define ll_vfs_symlink(dir, dentry, path, mode) vfs_symlink(dir, dentry, path, mode)
 245 #endif
 246
 247 #ifndef container_of
 248 #define container_of(ptr, type, member) ({                      \
 249                 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
 250                 (type *)( (char *)__mptr - offsetof(type,member) );})
 251 #endif
 252
 253 #ifdef HAVE_I_ALLOC_SEM
 254 #define UP_WRITE_I_ALLOC_SEM(i)   do { up_write(&(i)->i_alloc_sem); } while (0)
 255 #define DOWN_WRITE_I_ALLOC_SEM(i) do { down_write(&(i)->i_alloc_sem); } while(0)
 256 #define LASSERT_I_ALLOC_SEM_WRITE_LOCKED(i) LASSERT(down_read_trylock(&(i)->i_alloc_sem) == 0)
 257
 258 #define UP_READ_I_ALLOC_SEM(i)    do { up_read(&(i)->i_alloc_sem); } while (0)
 259 #define DOWN_READ_I_ALLOC_SEM(i)  do { down_read(&(i)->i_alloc_sem); } while (0)
 260 #define LASSERT_I_ALLOC_SEM_READ_LOCKED(i) LASSERT(down_write_trylock(&(i)->i_alloc_sem) == 0)
 261 #else
 262 #define UP_READ_I_ALLOC_SEM(i)              do { } while (0)
 263 #define DOWN_READ_I_ALLOC_SEM(i)            do { } while (0)
 264 #define LASSERT_I_ALLOC_SEM_READ_LOCKED(i)  do { } while (0)
 265
 266 #define UP_WRITE_I_ALLOC_SEM(i)             do { } while (0)
 267 #define DOWN_WRITE_I_ALLOC_SEM(i)           do { } while (0)
 268 #define LASSERT_I_ALLOC_SEM_WRITE_LOCKED(i) do { } while (0)
 269 #endif
 270
 271 #ifndef HAVE_GRAB_CACHE_PAGE_NOWAIT_GFP
 272 #define grab_cache_page_nowait_gfp(x, y, z) grab_cache_page_nowait((x), (y))
 273 #endif
 274
 275 #ifndef HAVE_FILEMAP_FDATAWRITE
 276 #define filemap_fdatawrite(mapping)      filemap_fdatasync(mapping)
 277 #endif
 278
 279 #ifdef HAVE_VFS_KERN_MOUNT
 280 static inline
 281 struct vfsmount *
 282 ll_kern_mount(const char *fstype, int flags, const char *name, void *data)
 283 {
 284         struct file_system_type *type = get_fs_type(fstype);
 285         struct vfsmount *mnt;
 286         if (!type)
 287                 return ERR_PTR(-ENODEV);
 288         mnt = vfs_kern_mount(type, flags, name, data);
 289         module_put(type->owner);
 290         return mnt;
 291 }
 292 #else
 293 #define ll_kern_mount(fstype, flags, name, data) do_kern_mount((fstype), (flags), (name), (data))
 294 #endif
 295
 296 #ifndef HAVE_GENERIC_FILE_READ
 297 static inline
 298 ssize_t
 299 generic_file_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
 300 {
 301         struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
 302         struct kiocb kiocb;
 303         ssize_t ret;
 304
 305         init_sync_kiocb(&kiocb, filp);
 306         kiocb.ki_pos = *ppos;
 307         kiocb.ki_left = len;
 308
 309         ret = generic_file_aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
 310         *ppos = kiocb.ki_pos;
 311         return ret;
 312 }
 313 #endif
 314
 315 #ifndef HAVE_GENERIC_FILE_WRITE
 316 static inline
 317 ssize_t
 318 generic_file_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
 319 {
 320         struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
 321         struct kiocb kiocb;
 322         ssize_t ret;
 323
 324         init_sync_kiocb(&kiocb, filp);
 325         kiocb.ki_pos = *ppos;
 326         kiocb.ki_left = len;
 327
 328         ret = generic_file_aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
 329         *ppos = kiocb.ki_pos;
 330
 331         return ret;
 332 }
 333 #endif
 334
 335 #ifdef HAVE_STATFS_DENTRY_PARAM
 336 #define ll_do_statfs(sb, sfs) (sb)->s_op->statfs((sb)->s_root, (sfs))
 337 #else
 338 #define ll_do_statfs(sb, sfs) (sb)->s_op->statfs((sb), (sfs))
 339 #endif
 340
 341 /* task_struct */
 342 #ifndef HAVE_TASK_PPTR
 343 #define p_pptr parent
 344 #endif
 345
 346 #ifndef HAVE_SB_TIME_GRAN
 347 #ifndef HAVE_S_TIME_GRAN
 348 #error Need s_time_gran patch!
 349 #endif
 350 static inline u32 get_sb_time_gran(struct super_block *sb)
 351 {
 352         return sb->s_time_gran;
 353 }
 354 #endif
 355
 356 #ifdef HAVE_RW_TREE_LOCK
 357 #define TREE_READ_LOCK_IRQ(mapping)     read_lock_irq(&(mapping)->tree_lock)
 358 #define TREE_READ_UNLOCK_IRQ(mapping) read_unlock_irq(&(mapping)->tree_lock)
 359 #else
 360 #define TREE_READ_LOCK_IRQ(mapping) spin_lock_irq(&(mapping)->tree_lock)
 361 #define TREE_READ_UNLOCK_IRQ(mapping) spin_unlock_irq(&(mapping)->tree_lock)
 362 #endif
 363
 364 #ifdef HAVE_UNREGISTER_BLKDEV_RETURN_INT
 365 #define ll_unregister_blkdev(a,b)       unregister_blkdev((a),(b))
 366 #else
 367 static inline
 368 int ll_unregister_blkdev(unsigned int dev, const char *name)
 369 {
 370         unregister_blkdev(dev, name);
 371         return 0;
 372 }
 373 #endif
 374
 375 #ifdef HAVE_INVALIDATE_BDEV_2ARG
 376 #define ll_invalidate_bdev(a,b)         invalidate_bdev((a),(b))
 377 #else
 378 #define ll_invalidate_bdev(a,b)         invalidate_bdev((a))
 379 #endif
 380
 381 #ifdef HAVE_INODE_BLKSIZE
 382 #define ll_inode_blksize(a)     (a)->i_blksize
 383 #else
 384 #define ll_inode_blksize(a)     (1<<(a)->i_blkbits)
 385 #endif
 386
 387 #ifndef HAVE_EXPORT_NR_FREE_BUFFER_PAGES
 388 static inline unsigned int ll_nr_free_buffer_pages(void)
 389 {
 390         struct sysinfo si;
 391
 392         si_meminfo(&si);
 393         return (unsigned int)(si.freeram - si.freehigh);
 394 }
 395 #else
 396 #define ll_nr_free_buffer_pages()       nr_free_buffer_pages()
 397 #endif
 398
 399 #ifdef HAVE_FS_RENAME_DOES_D_MOVE
 400 #define LL_RENAME_DOES_D_MOVE   FS_RENAME_DOES_D_MOVE
 401 #else
 402 #define LL_RENAME_DOES_D_MOVE   FS_ODD_RENAME
 403 #endif
 404
 405 /* add a lustre compatible layer for crypto API */
 406 #include <linux/crypto.h>
 407 #ifdef HAVE_ASYNC_BLOCK_CIPHER
 408 #define ll_crypto_hash          crypto_hash
 409 #define ll_crypto_cipher        crypto_blkcipher
 410 #define ll_crypto_alloc_hash(name, type, mask)  crypto_alloc_hash(name, type, mask)
 411 #define ll_crypto_hash_setkey(tfm, key, keylen) crypto_hash_setkey(tfm, key, keylen)
 412 #define ll_crypto_hash_init(desc)               crypto_hash_init(desc)
 413 #define ll_crypto_hash_update(desc, sl, bytes)  crypto_hash_update(desc, sl, bytes)
 414 #define ll_crypto_hash_final(desc, out)         crypto_hash_final(desc, out)
 415 #define ll_crypto_alloc_blkcipher(name, type, mask) \
 416                 crypto_alloc_blkcipher(name ,type, mask)
 417 #define ll_crypto_blkcipher_setkey(tfm, key, keylen) \
 418                 crypto_blkcipher_setkey(tfm, key, keylen)
 419 #define ll_crypto_blkcipher_set_iv(tfm, src, len) \
 420                 crypto_blkcipher_set_iv(tfm, src, len)
 421 #define ll_crypto_blkcipher_get_iv(tfm, dst, len) \
 422                 crypto_blkcipher_get_iv(tfm, dst, len)
 423 #define ll_crypto_blkcipher_encrypt(desc, dst, src, bytes) \
 424                 crypto_blkcipher_encrypt(desc, dst, src, bytes)
 425 #define ll_crypto_blkcipher_decrypt(desc, dst, src, bytes) \
 426                 crypto_blkcipher_decrypt(desc, dst, src, bytes)
 427 #define ll_crypto_blkcipher_encrypt_iv(desc, dst, src, bytes) \
 428                 crypto_blkcipher_encrypt_iv(desc, dst, src, bytes)
 429 #define ll_crypto_blkcipher_decrypt_iv(desc, dst, src, bytes) \
 430                 crypto_blkcipher_decrypt_iv(desc, dst, src, bytes)
 431
 432 static inline int ll_crypto_hmac(struct ll_crypto_hash *tfm,
 433                                  u8 *key, unsigned int *keylen,
 434                                  struct scatterlist *sg,
 435                                  unsigned int size, u8 *result)
 436 {
 437         struct hash_desc desc;
 438         int              rv;
 439         desc.tfm   = tfm;
 440         desc.flags = 0;
 441         rv = crypto_hash_setkey(desc.tfm, key, *keylen);
 442         if (rv) {
 443                 CERROR("failed to hash setkey: %d\n", rv);
 444                 return rv;
 445         }
 446         return crypto_hash_digest(&desc, sg, size, result);
 447 }
 448 static inline
 449 unsigned int crypto_tfm_alg_max_keysize(struct crypto_blkcipher *tfm)
 450 {
 451         return crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher.max_keysize;
 452 }
 453 static inline
 454 unsigned int crypto_tfm_alg_min_keysize(struct crypto_blkcipher *tfm)
 455 {
 456         return crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher.min_keysize;
 457 }
 458
 459 #define ll_crypto_hash_blocksize(tfm)       crypto_hash_blocksize(tfm)
 460 #define ll_crypto_hash_digestsize(tfm)      crypto_hash_digestsize(tfm)
 461 #define ll_crypto_blkcipher_ivsize(tfm)     crypto_blkcipher_ivsize(tfm)
 462 #define ll_crypto_blkcipher_blocksize(tfm)  crypto_blkcipher_blocksize(tfm)
 463 #define ll_crypto_free_hash(tfm)            crypto_free_hash(tfm)
 464 #define ll_crypto_free_blkcipher(tfm)       crypto_free_blkcipher(tfm)
 465 #else /* HAVE_ASYNC_BLOCK_CIPHER */
 466 #include <linux/scatterlist.h>
 467 #define ll_crypto_hash          crypto_tfm
 468 #define ll_crypto_cipher        crypto_tfm
 469 struct hash_desc {
 470         struct ll_crypto_hash *tfm;
 471         u32                    flags;
 472 };
 473 struct blkcipher_desc {
 474         struct ll_crypto_cipher *tfm;
 475         void                    *info;
 476         u32                      flags;
 477 };
 478 #define ll_crypto_blkcipher_setkey(tfm, key, keylen) \
 479         crypto_cipher_setkey(tfm, key, keylen)
 480 #define ll_crypto_blkcipher_set_iv(tfm, src, len) \
 481         crypto_cipher_set_iv(tfm, src, len)
 482 #define ll_crypto_blkcipher_get_iv(tfm, dst, len) \
 483         crypto_cipher_get_iv(tfm, dst, len)
 484 #define ll_crypto_blkcipher_encrypt(desc, dst, src, bytes) \
 485         crypto_cipher_encrypt((desc)->tfm, dst, src, bytes)
 486 #define ll_crypto_blkcipher_decrypt(desc, dst, src, bytes) \
 487         crypto_cipher_decrypt((desc)->tfm, dst, src, bytes)
 488 #define ll_crypto_blkcipher_decrypt_iv(desc, dst, src, bytes) \
 489         crypto_cipher_decrypt_iv((desc)->tfm, dst, src, bytes, (desc)->info)
 490 #define ll_crypto_blkcipher_encrypt_iv(desc, dst, src, bytes) \
 491         crypto_cipher_encrypt_iv((desc)->tfm, dst, src, bytes, (desc)->info)
 492
 493 extern struct ll_crypto_cipher *ll_crypto_alloc_blkcipher(
 494                             const char * algname, u32 type, u32 mask);
 495 static inline
 496 struct ll_crypto_hash *ll_crypto_alloc_hash(const char *alg, u32 type, u32 mask)
 497 {
 498         char        buf[CRYPTO_MAX_ALG_NAME + 1];
 499         const char *pan = alg;
 500
 501         if (strncmp("hmac(", alg, 5) == 0) {
 502                 char *vp = strnchr(alg, CRYPTO_MAX_ALG_NAME, ')');
 503                 if (vp) {
 504                         memcpy(buf, alg+ 5, vp - alg- 5);
 505                         buf[vp - alg - 5] = 0x00;
 506                         pan = buf;
 507                 }
 508         }
 509         return crypto_alloc_tfm(pan, 0);
 510 }
 511 static inline int ll_crypto_hash_init(struct hash_desc *desc)
 512 {
 513        crypto_digest_init(desc->tfm); return 0;
 514 }
 515 static inline int ll_crypto_hash_update(struct hash_desc *desc,
 516                                         struct scatterlist *sg,
 517                                         unsigned int nbytes)
 518 {
 519         struct scatterlist *sl = sg;
 520         unsigned int        count;
 521                 /*
 522                  * This way is very weakness. We must ensure that
 523                  * the sum of sg[0..i]->length isn't greater than nbytes.
 524                  * In the upstream kernel the crypto_hash_update() also
 525                  * via the nbytes computed the count of sg[...].
 526                  * The old style is more safely. but it gone.
 527                  */
 528         for (count = 0; nbytes > 0; count ++, sl ++) {
 529                 nbytes -= sl->length;
 530         }
 531         crypto_digest_update(desc->tfm, sg, count); return 0;
 532 }
 533 static inline int ll_crypto_hash_final(struct hash_desc *desc, u8 *out)
 534 {
 535         crypto_digest_final(desc->tfm, out); return 0;
 536 }
 537 static inline int ll_crypto_hmac(struct crypto_tfm *tfm,
 538                                  u8 *key, unsigned int *keylen,
 539                                  struct scatterlist *sg,
 540                                  unsigned int nbytes,
 541                                  u8 *out)
 542 {
 543         struct scatterlist *sl = sg;
 544         int                 count;
 545         for (count = 0; nbytes > 0; count ++, sl ++) {
 546                 nbytes -= sl->length;
 547         }
 548         crypto_hmac(tfm, key, keylen, sg, count, out);
 549         return 0;
 550 }
 551
 552 #define ll_crypto_hash_setkey(tfm, key, keylen) crypto_digest_setkey(tfm, key, keylen)
 553 #define ll_crypto_blkcipher_blocksize(tfm)      crypto_tfm_alg_blocksize(tfm)
 554 #define ll_crypto_blkcipher_ivsize(tfm) crypto_tfm_alg_ivsize(tfm)
 555 #define ll_crypto_hash_digestsize(tfm)  crypto_tfm_alg_digestsize(tfm)
 556 #define ll_crypto_hash_blocksize(tfm)   crypto_tfm_alg_blocksize(tfm)
 557 #define ll_crypto_free_hash(tfm)        crypto_free_tfm(tfm)
 558 #define ll_crypto_free_blkcipher(tfm)   crypto_free_tfm(tfm)
 559 #endif /* HAVE_ASYNC_BLOCK_CIPHER */
 560
 561 #endif /* __KERNEL__ */
 562 #endif /* _COMPAT25_H */