src/afs/LINUX/osi_compat.h

   1 /* Kernel compatibility routines
   2  *
   3  * This file contains definitions to provide compatibility between different
   4  * versions of the Linux kernel. It is an ifdef maze, but the idea is that
   5  * by concentrating the horror here, the rest of the tree may remaing a
   6  * little cleaner...
   7  */
   8
   9 #ifndef AFS_LINUX_OSI_COMPAT_H
  10 #define AFS_LINUX_OSI_COMPAT_H
  11
  12 #if defined(HAVE_LINUX_FREEZER_H)
  13 # include <linux/freezer.h>
  14 #endif
  15
  16 #if defined(LINUX_KEYRING_SUPPORT)
  17 # include <linux/rwsem.h>
  18 # include <linux/key.h>
  19 # if defined(HAVE_LINUX_KEY_TYPE_H)
  20 #  include <linux/key-type.h>
  21 # endif
  22 # ifndef KEY_ALLOC_IN_QUOTA
  23 /* Before these flags were added in Linux commit v2.6.18-rc1~816,
  24  * key_alloc just took a boolean not_in_quota */
  25 #  define KEY_ALLOC_IN_QUOTA 0
  26 #  define KEY_ALLOC_NOT_IN_QUOTA 1
  27 # endif
  28 #endif
  29
  30 #if defined(STRUCT_DENTRY_OPERATIONS_HAS_D_AUTOMOUNT) && !defined(DCACHE_NEED_AUTOMOUNT)
  31 # define DCACHE_NEED_AUTOMOUNT DMANAGED_AUTOMOUNT
  32 #endif
  33
  34 #ifdef HAVE_LINUX_STRUCT_VFS_PATH
  35 typedef struct vfs_path afs_linux_path_t;
  36 #else
  37 typedef struct path afs_linux_path_t;
  38 #endif
  39
  40 #if defined(STRUCT_DENTRY_HAS_D_U_D_ALIAS)
  41 # define d_alias d_u.d_alias
  42 #endif
  43
  44 #if defined(STRUCT_FILE_HAS_F_PATH)
  45 # if !defined(f_dentry)
  46 #  define f_dentry f_path.dentry
  47 # endif
  48 #endif
  49
  50 #ifndef HAVE_LINUX_FILE_DENTRY
  51 #define file_dentry(file) ((file)->f_dentry)
  52 #endif
  53
  54 #if defined(HAVE_LINUX_LOCKS_LOCK_FILE_WAIT)
  55 # define flock_lock_file_wait locks_lock_file_wait
  56 #endif
  57
  58 #if !defined(HAVE_LINUX_DO_SYNC_READ) && !defined(STRUCT_FILE_OPERATIONS_HAS_READ_ITER)
  59 static inline int
  60 do_sync_read(struct file *fp, char *buf, size_t count, loff_t *offp) {
  61     return generic_file_read(fp, buf, count, offp);
  62 }
  63
  64 static inline int
  65 do_sync_write(struct file *fp, char *buf, size_t count, loff_t *offp) {
  66     return generic_file_write(fp, buf, count, offp);
  67 }
  68
  69 #endif /* DO_SYNC_READ */
  70
  71 static inline int
  72 afs_posix_lock_file(struct file *fp, struct file_lock *flp) {
  73 #ifdef POSIX_LOCK_FILE_WAIT_ARG
  74     return posix_lock_file(fp, flp, NULL);
  75 #else
  76     flp->fl_flags &=~ FL_SLEEP;
  77     return posix_lock_file(fp, flp);
  78 #endif
  79 }
  80
  81 static inline void
  82 afs_posix_test_lock(struct file *fp, struct file_lock *flp) {
  83 #if defined(POSIX_TEST_LOCK_CONFLICT_ARG)
  84     struct file_lock conflict;
  85     if (posix_test_lock(fp, flp, &conflict)) {
  86         locks_copy_lock(flp, &conflict);
  87         flp->fl_type = F_UNLCK;
  88     }
  89 #elif defined(POSIX_TEST_LOCK_RETURNS_CONFLICT)
  90     struct file_lock *conflict;
  91     conflict = posix_test_lock(fp, flp);
  92     if (conflict) {
  93         locks_copy_lock(flp, conflict);
  94         flp->fl_type = F_UNLCK;
  95     }
  96 #else
  97     posix_test_lock(fp, flp);
  98 #endif
  99 }
 100
 101 #ifdef DCACHE_NFSFS_RENAMED
 102 static inline void
 103 afs_linux_clear_nfsfs_renamed(struct dentry *dp) {
 104     spin_lock(&dp->d_lock);
 105     dp->d_flags &= ~DCACHE_NFSFS_RENAMED;
 106     spin_unlock(&dp->d_lock);
 107 }
 108
 109 static inline void
 110 afs_linux_set_nfsfs_renamed(struct dentry *dp) {
 111     spin_lock(&dp->d_lock);
 112     dp->d_flags |= DCACHE_NFSFS_RENAMED;
 113     spin_unlock(&dp->d_lock);
 114 }
 115
 116 static inline int
 117 afs_linux_nfsfs_renamed(struct dentry *dp) {
 118     return dp->d_flags & DCACHE_NFSFS_RENAMED;
 119 }
 120
 121 #else
 122 static inline void afs_linux_clear_nfsfs_renamed(void) { return; }
 123 static inline void afs_linux_set_nfsfs_renamed(void) { return; }
 124 #endif
 125
 126 #ifndef HAVE_LINUX_HLIST_UNHASHED
 127 static void
 128 hlist_unhashed(const struct hlist_node *h) {
 129     return (!h->pprev == NULL);
 130 }
 131 #endif
 132
 133 #if defined(WRITEPAGE_ACTIVATE)
 134 #define AOP_WRITEPAGE_ACTIVATE WRITEPAGE_ACTIVATE
 135 #endif
 136
 137 #if defined(STRUCT_ADDRESS_SPACE_OPERATIONS_HAS_WRITE_BEGIN) && !defined(HAVE_LINUX_GRAB_CACHE_PAGE_WRITE_BEGIN)
 138 static inline struct page *
 139 grab_cache_page_write_begin(struct address_space *mapping, pgoff_t index,
 140                             unsigned int flags) {
 141     return __grab_cache_page(mapping, index);
 142 }
 143 #endif
 144
 145 #if defined(HAVE_KMEM_CACHE_T)
 146 #define afs_kmem_cache_t kmem_cache_t
 147 #else
 148 #define afs_kmem_cache_t struct kmem_cache
 149 #endif
 150
 151 extern void init_once(void *);
 152 #if defined(HAVE_KMEM_CACHE_T)
 153 static inline void
 154 init_once_func(void * foo, kmem_cache_t * cachep, unsigned long flags) {
 155 #if defined(SLAB_CTOR_VERIFY)
 156     if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 157         SLAB_CTOR_CONSTRUCTOR)
 158 #endif
 159     init_once(foo);
 160 }
 161 #elif defined(KMEM_CACHE_INIT)
 162 static inline void
 163 init_once_func(struct kmem_cache * cachep, void * foo) {
 164     init_once(foo);
 165 }
 166 #elif !defined(KMEM_CACHE_CTOR_TAKES_VOID)
 167 static inline void
 168 init_once_func(void * foo, struct kmem_cache * cachep, unsigned long flags) {
 169 #if defined(SLAB_CTOR_VERIFY)
 170     if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 171         SLAB_CTOR_CONSTRUCTOR)
 172 #endif
 173     init_once(foo);
 174 }
 175 #else
 176 static inline void
 177 init_once_func(void * foo) {
 178     init_once(foo);
 179 }
 180 #endif
 181
 182 #ifndef SLAB_RECLAIM_ACCOUNT
 183 #define SLAB_RECLAIM_ACCOUNT 0
 184 #endif
 185
 186 #if defined(SLAB_KERNEL)
 187 #define KALLOC_TYPE SLAB_KERNEL
 188 #else
 189 #define KALLOC_TYPE GFP_KERNEL
 190 #endif
 191
 192 #ifdef LINUX_KEYRING_SUPPORT
 193 static inline struct key *
 194 afs_linux_key_alloc(struct key_type *type, const char *desc, afs_kuid_t uid,
 195                     afs_kgid_t gid, key_perm_t perm, unsigned long flags)
 196 {
 197 # if defined(KEY_ALLOC_BYPASS_RESTRICTION)
 198     return key_alloc(type, desc, uid, gid, current_cred(), perm, flags, NULL);
 199 # elif defined(KEY_ALLOC_NEEDS_STRUCT_TASK)
 200     return key_alloc(type, desc, uid, gid, current, perm, flags);
 201 # elif defined(KEY_ALLOC_NEEDS_CRED)
 202     return key_alloc(type, desc, uid, gid, current_cred(), perm, flags);
 203 # else
 204     return key_alloc(type, desc, uid, gid, perm, flags);
 205 # endif
 206 }
 207
 208 # if defined(STRUCT_TASK_STRUCT_HAS_CRED)
 209 static inline struct key *
 210 afs_session_keyring(afs_ucred_t *cred)
 211 {
 212 #  if defined(STRUCT_CRED_HAS_SESSION_KEYRING)
 213     return cred->session_keyring;
 214 #  else
 215     return cred->tgcred->session_keyring;
 216 #  endif
 217 }
 218
 219 static inline struct key*
 220 afs_linux_search_keyring(afs_ucred_t *cred, struct key_type *type)
 221 {
 222     key_ref_t key_ref;
 223
 224     if (afs_session_keyring(cred)) {
 225 #  if defined(KEYRING_SEARCH_TAKES_RECURSE)
 226         key_ref = keyring_search(
 227                       make_key_ref(afs_session_keyring(cred), 1),
 228                       type, "_pag", 1);
 229 #  else
 230         key_ref = keyring_search(
 231                       make_key_ref(afs_session_keyring(cred), 1),
 232                       type, "_pag");
 233 #  endif
 234         if (IS_ERR(key_ref))
 235             return ERR_CAST(key_ref);
 236
 237         return key_ref_to_ptr(key_ref);
 238     }
 239
 240     return ERR_PTR(-ENOKEY);
 241 }
 242 # else
 243 static inline struct key*
 244 afs_linux_search_keyring(afs_ucred_t *cred, struct key_type *type)
 245 {
 246     return request_key(type, "_pag", NULL);
 247 }
 248 # endif /* STRUCT_TASK_STRUCT_HAS_CRED */
 249
 250 static_inline struct key *
 251 afs_set_session_keyring(struct key *keyring)
 252 {
 253     struct key *old;
 254 #if defined(STRUCT_CRED_HAS_SESSION_KEYRING)
 255     struct cred *new_creds;
 256     old = current_session_keyring();
 257     new_creds = prepare_creds();
 258     rcu_assign_pointer(new_creds->session_keyring, keyring);
 259     commit_creds(new_creds);
 260 #else
 261     spin_lock_irq(&current->sighand->siglock);
 262     old = task_session_keyring(current);
 263     smp_wmb();
 264     task_session_keyring(current) = keyring;
 265     spin_unlock_irq(&current->sighand->siglock);
 266 #endif
 267     return old;
 268 }
 269 #endif /* LINUX_KEYRING_SUPPORT */
 270
 271 #ifdef STRUCT_TASK_STRUCT_HAS_CRED
 272 static inline int
 273 afs_linux_cred_is_current(afs_ucred_t *cred)
 274 {
 275     return (cred == current_cred());
 276 }
 277 #else
 278 static inline int
 279 afs_linux_cred_is_current(afs_ucred_t *cred)
 280 {
 281     return 1;
 282 }
 283 #endif
 284
 285 #ifndef HAVE_LINUX_PAGE_OFFSET
 286 static inline loff_t
 287 page_offset(struct page *pp)
 288 {
 289     return (((loff_t) pp->index) << PAGE_SHIFT);
 290 }
 291 #endif
 292
 293 #ifndef HAVE_LINUX_ZERO_USER_SEGMENTS
 294 static inline void
 295 zero_user_segments(struct page *pp, unsigned int from1, unsigned int to1,
 296                    unsigned int from2, unsigned int to2)
 297 {
 298     void *base = kmap_atomic(pp, KM_USER0);
 299
 300     if (to1 > from1)
 301         memset(base + from1, 0, to1 - from1);
 302
 303     if (to2 > from2)
 304         memset(base + from2, 0, to2 - from2);
 305
 306     flush_dcache_page(pp);
 307     kunmap_atomic(base, KM_USER0);
 308 }
 309
 310 static inline void
 311 zero_user_segment(struct page *pp, unsigned int from1, unsigned int to1)
 312 {
 313     zero_user_segments(pp, from1, to1, 0, 0);
 314 }
 315 #endif
 316
 317 #ifndef HAVE_LINUX_KERNEL_SETSOCKOPT
 318 /* Available from 2.6.19 */
 319
 320 static inline int
 321 kernel_setsockopt(struct socket *sockp, int level, int name, char *val,
 322                   unsigned int len) {
 323     mm_segment_t old_fs = get_fs();
 324     int ret;
 325
 326     set_fs(get_ds());
 327     ret = sockp->ops->setsockopt(sockp, level, name, val, len);
 328     set_fs(old_fs);
 329
 330     return ret;
 331 }
 332
 333 static inline int
 334 kernel_getsockopt(struct socket *sockp, int level, int name, char *val,
 335                   int *len) {
 336     mm_segment_t old_fs = get_fs();
 337     int ret;
 338
 339     set_fs(get_ds());
 340     ret = sockp->ops->getsockopt(sockp, level, name, val, len);
 341     set_fs(old_fs);
 342
 343     return ret;
 344 }
 345 #endif
 346
 347 #ifdef HAVE_TRY_TO_FREEZE
 348 static inline int
 349 afs_try_to_freeze(void) {
 350 # ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
 351     return try_to_freeze(PF_FREEZE);
 352 # else
 353     return try_to_freeze();
 354 # endif
 355 }
 356 #else
 357 static inline int
 358 afs_try_to_freeze(void) {
 359 # ifdef CONFIG_PM
 360     if (current->flags & PF_FREEZE) {
 361         refrigerator(PF_FREEZE);
 362         return 1;
 363     }
 364 # endif
 365     return 0;
 366 }
 367 #endif
 368
 369 /* The commit which changed refrigerator so that it takes no arguments
 370  * also added freezing(), so if LINUX_REFRIGERATOR_TAKES_PF_FREEZE is
 371  * true, the kernel doesn't have a freezing() function.
 372  */
 373 #ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
 374 static inline int
 375 freezing(struct task_struct *p)
 376 {
 377 # ifdef CONFIG_PM
 378     return p->flags & PF_FREEZE;
 379 # else
 380     return 0;
 381 # endif
 382 }
 383 #endif
 384
 385 #if !defined(HAVE_LINUX_PAGECHECKED)
 386 # if defined(HAVE_LINUX_PAGEFSMISC)
 387 #  include <linux/page-flags.h>
 388
 389 #  define PageChecked(p)            PageFsMisc((p))
 390 #  define SetPageChecked(p)         SetPageFsMisc((p))
 391 #  define ClearPageChecked(p)       ClearPageFsMisc((p))
 392
 393 # endif
 394 #endif
 395
 396 #if !defined(NEW_EXPORT_OPS)
 397 extern struct export_operations export_op_default;
 398 #endif
 399
 400 static inline struct dentry *
 401 afs_get_dentry_from_fh(struct super_block *afs_cacheSBp, afs_dcache_id_t *ainode,
 402                 int cache_fh_len, int cache_fh_type,
 403                 int (*afs_fh_acceptable)(void *, struct dentry *)) {
 404 #if defined(NEW_EXPORT_OPS)
 405     return afs_cacheSBp->s_export_op->fh_to_dentry(afs_cacheSBp, &ainode->ufs.fh,
 406                 cache_fh_len, cache_fh_type);
 407 #else
 408     if (afs_cacheSBp->s_export_op && afs_cacheSBp->s_export_op->decode_fh)
 409         return afs_cacheSBp->s_export_op->decode_fh(afs_cacheSBp, ainode->ufs.raw,
 410                         cache_fh_len, cache_fh_type, afs_fh_acceptable, NULL);
 411     else
 412         return export_op_default.decode_fh(afs_cacheSBp, ainode->ufs.raw,
 413                         cache_fh_len, cache_fh_type, afs_fh_acceptable, NULL);
 414 #endif
 415 }
 416
 417 static inline int
 418 afs_get_fh_from_dentry(struct dentry *dp, afs_ufs_dcache_id_t *ainode, int *max_lenp) {
 419     if (dp->d_sb->s_export_op->encode_fh)
 420 #if defined(EXPORT_OP_ENCODE_FH_TAKES_INODES)
 421         return dp->d_sb->s_export_op->encode_fh(dp->d_inode, &ainode->raw[0], max_lenp, NULL);
 422 #else
 423         return dp->d_sb->s_export_op->encode_fh(dp, &ainode->raw[0], max_lenp, 0);
 424 #endif
 425 #if defined(NEW_EXPORT_OPS)
 426     /* If fs doesn't provide an encode_fh method, assume the default INO32 type */
 427     *max_lenp = sizeof(struct fid)/4;
 428     ainode->fh.i32.ino = dp->d_inode->i_ino;
 429     ainode->fh.i32.gen = dp->d_inode->i_generation;
 430     return FILEID_INO32_GEN;
 431 #else
 432     /* or call the default encoding function for the old API */
 433     return export_op_default.encode_fh(dp, &ainode->raw[0], max_lenp, 0);
 434 #endif
 435 }
 436
 437 static inline void
 438 afs_init_sb_export_ops(struct super_block *sb) {
 439 #if !defined(NEW_EXPORT_OPS)
 440     /*
 441      * decode_fh will call this function.  If not defined for this FS, make
 442      * sure it points to the default
 443      */
 444     if (!sb->s_export_op->find_exported_dentry) {
 445         /* Some kernels (at least 2.6.9) do not prototype find_exported_dentry,
 446          * even though it is exported, so prototype it ourselves. Newer
 447          * kernels do prototype it, but as long as our protoype matches the
 448          * real one (the signature never changed before NEW_EXPORT_OPS came
 449          * into play), there should be no problems. */
 450         extern struct dentry * find_exported_dentry(struct super_block *sb, void *obj, void *parent,
 451                                                     int (*acceptable)(void *context, struct dentry *de),
 452                                                     void *context);
 453         sb->s_export_op->find_exported_dentry = find_exported_dentry;
 454     }
 455 #endif
 456 }
 457
 458 static inline void
 459 afs_linux_lock_inode(struct inode *ip) {
 460 #if defined(HAVE_LINUX_INODE_LOCK)
 461     inode_lock(ip);
 462 #elif defined(STRUCT_INODE_HAS_I_MUTEX)
 463     mutex_lock(&ip->i_mutex);
 464 #else
 465     down(&ip->i_sem);
 466 #endif
 467 }
 468
 469 static inline void
 470 afs_linux_unlock_inode(struct inode *ip) {
 471 #if defined(HAVE_LINUX_INODE_LOCK)
 472     inode_unlock(ip);
 473 #elif defined(STRUCT_INODE_HAS_I_MUTEX)
 474     mutex_unlock(&ip->i_mutex);
 475 #else
 476     up(&ip->i_sem);
 477 #endif
 478 }
 479
 480 /* Use these to lock or unlock an inode for processing
 481  * its dentry aliases en masse.
 482  */
 483 #if defined(HAVE_DCACHE_LOCK)
 484 #define afs_d_alias_lock(ip)        spin_lock(&dcache_lock)
 485 #define afs_d_alias_unlock(ip)      spin_unlock(&dcache_lock)
 486 #else
 487 #define afs_d_alias_lock(ip)        spin_lock(&(ip)->i_lock)
 488 #define afs_d_alias_unlock(ip)      spin_unlock(&(ip)->i_lock)
 489 #endif
 490
 491
 492 /* Use this instead of dget for dentry operations
 493  * that occur under a higher lock (e.g. alias processing).
 494  * Requires that the higher lock (e.g. dcache_lock or
 495  * inode->i_lock) is already held.
 496  */
 497 static inline void
 498 afs_linux_dget(struct dentry *dp) {
 499 #if defined(HAVE_DCACHE_LOCK)
 500     dget_locked(dp);
 501 #else
 502     dget(dp);
 503 #endif
 504 }
 505
 506
 507 static inline int
 508 afs_inode_setattr(struct osi_file *afile, struct iattr *newattrs) {
 509
 510     int code = 0;
 511     struct inode *inode = OSIFILE_INODE(afile);
 512 #if !defined(HAVE_LINUX_INODE_SETATTR)
 513     code = inode->i_op->setattr(afile->filp->f_dentry, newattrs);
 514 #elif defined(INODE_SETATTR_NOT_VOID)
 515     if (inode->i_op && inode->i_op->setattr)
 516         code = inode->i_op->setattr(afile->filp->f_dentry, newattrs);
 517     else
 518         code = inode_setattr(inode, newattrs);
 519 #else
 520     inode_setattr(inode, newattrs);
 521 #endif
 522     return code;
 523 }
 524
 525 #if defined(HAVE_LINUX_PATH_LOOKUP)
 526 static inline int
 527 afs_kern_path(char *aname, int flags, struct nameidata *nd) {
 528     return path_lookup(aname, flags, nd);
 529 }
 530 #else
 531 static inline int
 532 afs_kern_path(char *aname, int flags, afs_linux_path_t *path) {
 533     return kern_path(aname, flags, path);
 534 }
 535 #endif
 536
 537 static inline void
 538 #if defined(HAVE_LINUX_PATH_LOOKUP)
 539 afs_get_dentry_ref(struct nameidata *nd, struct vfsmount **mnt, struct dentry **dpp) {
 540 #else
 541 afs_get_dentry_ref(afs_linux_path_t *path, struct vfsmount **mnt, struct dentry **dpp) {
 542 #endif
 543 #if defined(HAVE_LINUX_PATH_LOOKUP)
 544 # if defined(STRUCT_NAMEIDATA_HAS_PATH)
 545     *dpp = dget(nd->path.dentry);
 546     if (mnt)
 547         *mnt = mntget(nd->path.mnt);
 548     path_put(&nd->path);
 549 # else
 550     *dpp = dget(nd->dentry);
 551     if (mnt)
 552         *mnt = mntget(nd->mnt);
 553     path_release(nd);
 554 # endif
 555 #else
 556     *dpp = dget(path->dentry);
 557     if (mnt)
 558         *mnt = mntget(path->mnt);
 559     path_put(path);
 560 #endif
 561 }
 562
 563 /* wait_event_freezable appeared with 2.6.24 */
 564
 565 /* These implement the original AFS wait behaviour, with respect to the
 566  * refrigerator, rather than the behaviour of the current wait_event_freezable
 567  * implementation.
 568  */
 569
 570 #ifndef wait_event_freezable
 571 # define wait_event_freezable(waitqueue, condition)                             \
 572 ({                                                                              \
 573     int _ret;                                                                   \
 574     do {                                                                        \
 575         _ret = wait_event_interruptible(waitqueue,                              \
 576                                         (condition) || freezing(current));      \
 577         if (_ret && !freezing(current))                                 \
 578             break;                                                              \
 579         else if (!(condition))                                                  \
 580             _ret = -EINTR;                                                      \
 581     } while (afs_try_to_freeze());                                              \
 582     _ret;                                                                       \
 583 })
 584
 585 # define wait_event_freezable_timeout(waitqueue, condition, timeout)            \
 586 ({                                                                              \
 587      int _ret;                                                                  \
 588      do {                                                                       \
 589         _ret = wait_event_interruptible_timeout(waitqueue,                      \
 590                                                 (condition ||                   \
 591                                                  freezing(current)),            \
 592                                                 timeout);                       \
 593      } while (afs_try_to_freeze());                                             \
 594      _ret;                                                                      \
 595 })
 596 #endif
 597
 598 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
 599 static inline struct file *
 600 afs_dentry_open(struct dentry *dp, struct vfsmount *mnt, int flags, const struct cred *creds) {
 601 #if defined(DENTRY_OPEN_TAKES_PATH)
 602     afs_linux_path_t path;
 603     struct file *filp;
 604     path.mnt = mnt;
 605     path.dentry = dp;
 606     /* note that dentry_open will path_get for us */
 607     filp = dentry_open(&path, flags, creds);
 608     return filp;
 609 #else
 610     return dentry_open(dget(dp), mntget(mnt), flags, creds);
 611 #endif
 612 }
 613 #endif
 614
 615 static inline int
 616 afs_truncate(struct inode *inode, int len)
 617 {
 618     int code;
 619 #if defined(STRUCT_INODE_OPERATIONS_HAS_TRUNCATE)
 620     code = vmtruncate(inode, len);
 621 #else
 622     code = inode_newsize_ok(inode, len);
 623     if (!code)
 624         truncate_setsize(inode, len);
 625 #endif
 626     return code;
 627 }
 628
 629 static inline struct proc_dir_entry *
 630 afs_proc_create(char *name, umode_t mode, struct proc_dir_entry *parent, struct file_operations *fops) {
 631 #if defined(HAVE_LINUX_PROC_CREATE)
 632     return proc_create(name, mode, parent, fops);
 633 #else
 634     struct proc_dir_entry *entry;
 635     entry = create_proc_entry(name, mode, parent);
 636     if (entry)
 637         entry->proc_fops = fops;
 638     return entry;
 639 #endif
 640 }
 641
 642 static inline int
 643 afs_dentry_count(struct dentry *dp)
 644 {
 645 #if defined(HAVE_LINUX_D_COUNT)
 646     return d_count(dp);
 647 #elif defined(D_COUNT_INT)
 648     return dp->d_count;
 649 #else
 650     return atomic_read(&dp->d_count);
 651 #endif
 652 }
 653
 654 static inline void
 655 afs_maybe_shrink_dcache(struct dentry *dp)
 656 {
 657 #if defined(HAVE_LINUX_D_COUNT) || defined(D_COUNT_INT)
 658     spin_lock(&dp->d_lock);
 659     if (afs_dentry_count(dp) > 1) {
 660         spin_unlock(&dp->d_lock);
 661         shrink_dcache_parent(dp);
 662     } else
 663         spin_unlock(&dp->d_lock);
 664 #else
 665     if (afs_dentry_count(dp) > 1)
 666         shrink_dcache_parent(dp);
 667 #endif
 668 }
 669
 670 static inline int
 671 afs_d_invalidate(struct dentry *dp)
 672 {
 673 #if defined(D_INVALIDATE_IS_VOID)
 674     d_invalidate(dp);
 675     return 0;
 676 #else
 677     return d_invalidate(dp);
 678 #endif
 679 }
 680
 681 #if defined(HAVE_LINUX___VFS_WRITE)
 682 # define AFS_FILE_NEEDS_SET_FS 1
 683 #elif defined(HAVE_LINUX_KERNEL_WRITE)
 684 /* #undef AFS_FILE_NEEDS_SET_FS */
 685 #else
 686 # define AFS_FILE_NEEDS_SET_FS 1
 687 #endif
 688
 689 static inline int
 690 afs_file_read(struct file *filp, char __user *buf, size_t len, loff_t *pos)
 691 {
 692 #if defined(HAVE_LINUX___VFS_WRITE)
 693     return __vfs_read(filp, buf, len, pos);
 694 #elif defined(HAVE_LINUX_KERNEL_WRITE)
 695 # if defined(KERNEL_READ_OFFSET_IS_LAST)
 696     return kernel_read(filp, buf, len, pos);
 697 # else
 698     return kernel_read(filp, *pos, buf, len);
 699 # endif
 700 #else
 701     return filp->f_op->read(filp, buf, len, pos);
 702 #endif
 703 }
 704
 705 static inline int
 706 afs_file_write(struct file *filp, char __user *buf, size_t len, loff_t *pos)
 707 {
 708 #if defined(HAVE_LINUX___VFS_WRITE)
 709     return __vfs_write(filp, buf, len, pos);
 710 #elif defined(HAVE_LINUX_KERNEL_WRITE)
 711 # if defined(KERNEL_READ_OFFSET_IS_LAST)
 712     return kernel_write(filp, buf, len, pos);
 713 # else
 714     return kernel_write(filp, buf, len, *pos);
 715 # endif
 716 #else
 717     return filp->f_op->write(filp, buf, len, pos);
 718 #endif
 719 }
 720
 721 #endif /* AFS_LINUX_OSI_COMPAT_H */