lustre/include/linux/lustre_compat25.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef _LINUX_COMPAT25_H
  38 #define _LINUX_COMPAT25_H
  39
  40 #include <linux/fs_struct.h>
  41 #include <linux/namei.h>
  42 #include <libcfs/linux/portals_compat25.h>
  43
  44 #include <linux/lustre_patchless_compat.h>
  45
  46 #ifdef HAVE_FS_STRUCT_RWLOCK
  47 # define LOCK_FS_STRUCT(fs)     write_lock(&(fs)->lock)
  48 # define UNLOCK_FS_STRUCT(fs)   write_unlock(&(fs)->lock)
  49 #else
  50 # define LOCK_FS_STRUCT(fs)     spin_lock(&(fs)->lock)
  51 # define UNLOCK_FS_STRUCT(fs)   spin_unlock(&(fs)->lock)
  52 #endif
  53
  54 #ifdef HAVE_FS_STRUCT_USE_PATH
  55 static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
  56                                  struct dentry *dentry)
  57 {
  58         struct path path;
  59         struct path old_pwd;
  60
  61         path.mnt = mnt;
  62         path.dentry = dentry;
  63         LOCK_FS_STRUCT(fs);
  64         old_pwd = fs->pwd;
  65         path_get(&path);
  66         fs->pwd = path;
  67         UNLOCK_FS_STRUCT(fs);
  68
  69         if (old_pwd.dentry)
  70                 path_put(&old_pwd);
  71 }
  72
  73 #else
  74
  75 static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
  76                 struct dentry *dentry)
  77 {
  78         struct dentry *old_pwd;
  79         struct vfsmount *old_pwdmnt;
  80
  81         LOCK_FS_STRUCT(fs);
  82         old_pwd = fs->pwd;
  83         old_pwdmnt = fs->pwdmnt;
  84         fs->pwdmnt = mntget(mnt);
  85         fs->pwd = dget(dentry);
  86         UNLOCK_FS_STRUCT(fs);
  87
  88         if (old_pwd) {
  89                 dput(old_pwd);
  90                 mntput(old_pwdmnt);
  91         }
  92 }
  93 #endif
  94
  95 /*
  96  * set ATTR_BLOCKS to a high value to avoid any risk of collision with other
  97  * ATTR_* attributes (see bug 13828)
  98  */
  99 #define ATTR_BLOCKS    (1 << 27)
 100
 101 #define current_ngroups current_cred()->group_info->ngroups
 102 #define current_groups current_cred()->group_info->small_block
 103
 104 /*
 105  * OBD need working random driver, thus all our
 106  * initialization routines must be called after device
 107  * driver initialization
 108  */
 109 #ifndef MODULE
 110 #undef module_init
 111 #define module_init(a)     late_initcall(a)
 112 #endif
 113
 114 #define LTIME_S(time)                   (time.tv_sec)
 115
 116 #ifdef HAVE_GENERIC_PERMISSION_2ARGS
 117 # define ll_generic_permission(inode, mask, flags, check_acl) \
 118          generic_permission(inode, mask)
 119 #elif defined HAVE_GENERIC_PERMISSION_4ARGS
 120 # define ll_generic_permission(inode, mask, flags, check_acl) \
 121          generic_permission(inode, mask, flags, check_acl)
 122 #else
 123 # define ll_generic_permission(inode, mask, flags, check_acl) \
 124          generic_permission(inode, mask, check_acl)
 125 #endif
 126
 127 #ifdef HAVE_BLKDEV_PUT_2ARGS
 128 #define ll_blkdev_put(a, b) blkdev_put(a, b)
 129 #else
 130 #define ll_blkdev_put(a, b) blkdev_put(a)
 131 #endif
 132
 133 #ifdef HAVE_DENTRY_OPEN_USE_PATH
 134 #define ll_dentry_open(a,b,c)   dentry_open(a,b,c)
 135 #else
 136 /*
 137  * dentry_open handles its own reference counting since Linux v3.6
 138  * (commit 765927b2). Callers should free their own references.
 139  *
 140  * Prior versions expected the caller to increment the references.
 141  * The references are retained on success and freed on error.
 142  */
 143 static inline struct file *ll_dentry_open(struct path *path, int flags,
 144                                           const struct cred *cred)
 145 {
 146         mntget(path->mnt);
 147         dget(path->dentry);
 148         return dentry_open(path->dentry, path->mnt, flags, cred);
 149 }
 150 #endif
 151
 152 #ifdef HAVE_SECURITY_PLUG
 153 #define ll_vfs_symlink(dir, dentry, mnt, path, mode) \
 154                 vfs_symlink(dir, dentry, mnt, path, mode)
 155 #else
 156 #ifdef HAVE_4ARGS_VFS_SYMLINK
 157 #define ll_vfs_symlink(dir, dentry, mnt, path, mode) \
 158                 vfs_symlink(dir, dentry, path, mode)
 159 #else
 160 #define ll_vfs_symlink(dir, dentry, mnt, path, mode) \
 161                        vfs_symlink(dir, dentry, path)
 162 #endif
 163
 164 #endif
 165
 166 #if !defined(HAVE_FILE_LLSEEK_SIZE) || defined(HAVE_FILE_LLSEEK_SIZE_5ARGS)
 167 #define ll_generic_file_llseek_size(file, offset, origin, maxbytes, eof) \
 168                 generic_file_llseek_size(file, offset, origin, maxbytes, eof);
 169 #else
 170 #define ll_generic_file_llseek_size(file, offset, origin, maxbytes, eof) \
 171                 generic_file_llseek_size(file, offset, origin, maxbytes);
 172 #endif
 173
 174 #ifdef HAVE_INODE_DIO_WAIT
 175 /* inode_dio_wait(i) use as-is for write lock */
 176 # define inode_dio_write_done(i)        do {} while (0) /* for write unlock */
 177 # define inode_dio_read(i)              atomic_inc(&(i)->i_dio_count)
 178 /* inode_dio_done(i) use as-is for read unlock */
 179 #else
 180 # define inode_dio_wait(i)              down_write(&(i)->i_alloc_sem)
 181 # define inode_dio_write_done(i)        up_write(&(i)->i_alloc_sem)
 182 # define inode_dio_read(i)              down_read(&(i)->i_alloc_sem)
 183 # define inode_dio_done(i)              up_read(&(i)->i_alloc_sem)
 184 #endif
 185
 186 #ifdef HAVE_RW_TREE_LOCK
 187 #define TREE_READ_LOCK_IRQ(mapping)     read_lock_irq(&(mapping)->tree_lock)
 188 #define TREE_READ_UNLOCK_IRQ(mapping)   read_unlock_irq(&(mapping)->tree_lock)
 189 #else
 190 #define TREE_READ_LOCK_IRQ(mapping)     spin_lock_irq(&(mapping)->tree_lock)
 191 #define TREE_READ_UNLOCK_IRQ(mapping)   spin_unlock_irq(&(mapping)->tree_lock)
 192 #endif
 193
 194 #ifdef HAVE_UNREGISTER_BLKDEV_RETURN_INT
 195 #define ll_unregister_blkdev(a,b)       unregister_blkdev((a),(b))
 196 #else
 197 static inline
 198 int ll_unregister_blkdev(unsigned int dev, const char *name)
 199 {
 200         unregister_blkdev(dev, name);
 201         return 0;
 202 }
 203 #endif
 204
 205 #ifdef HAVE_INVALIDATE_BDEV_2ARG
 206 #define ll_invalidate_bdev(a,b)         invalidate_bdev((a),(b))
 207 #else
 208 #define ll_invalidate_bdev(a,b)         invalidate_bdev((a))
 209 #endif
 210
 211 #ifndef FS_HAS_FIEMAP
 212 #define FS_HAS_FIEMAP                   (0)
 213 #endif
 214
 215 #ifndef HAVE_FS_RENAME_DOES_D_MOVE
 216 #define FS_RENAME_DOES_D_MOVE           FS_ODD_RENAME
 217 #endif
 218
 219 /* add a lustre compatible layer for crypto API */
 220 #include <linux/crypto.h>
 221 #define ll_crypto_hash          crypto_hash
 222 #define ll_crypto_cipher        crypto_blkcipher
 223 #define ll_crypto_alloc_hash(name, type, mask)  crypto_alloc_hash(name, type, mask)
 224 #define ll_crypto_hash_setkey(tfm, key, keylen) crypto_hash_setkey(tfm, key, keylen)
 225 #define ll_crypto_hash_init(desc)               crypto_hash_init(desc)
 226 #define ll_crypto_hash_update(desc, sl, bytes)  crypto_hash_update(desc, sl, bytes)
 227 #define ll_crypto_hash_final(desc, out)         crypto_hash_final(desc, out)
 228 #define ll_crypto_blkcipher_setkey(tfm, key, keylen) \
 229                 crypto_blkcipher_setkey(tfm, key, keylen)
 230 #define ll_crypto_blkcipher_set_iv(tfm, src, len) \
 231                 crypto_blkcipher_set_iv(tfm, src, len)
 232 #define ll_crypto_blkcipher_get_iv(tfm, dst, len) \
 233                 crypto_blkcipher_get_iv(tfm, dst, len)
 234 #define ll_crypto_blkcipher_encrypt(desc, dst, src, bytes) \
 235                 crypto_blkcipher_encrypt(desc, dst, src, bytes)
 236 #define ll_crypto_blkcipher_decrypt(desc, dst, src, bytes) \
 237                 crypto_blkcipher_decrypt(desc, dst, src, bytes)
 238 #define ll_crypto_blkcipher_encrypt_iv(desc, dst, src, bytes) \
 239                 crypto_blkcipher_encrypt_iv(desc, dst, src, bytes)
 240 #define ll_crypto_blkcipher_decrypt_iv(desc, dst, src, bytes) \
 241                 crypto_blkcipher_decrypt_iv(desc, dst, src, bytes)
 242
 243 static inline
 244 struct ll_crypto_cipher *ll_crypto_alloc_blkcipher(const char *name,
 245                                                    u32 type, u32 mask)
 246 {
 247         struct ll_crypto_cipher *rtn = crypto_alloc_blkcipher(name, type, mask);
 248
 249         return (rtn == NULL ? ERR_PTR(-ENOMEM) : rtn);
 250 }
 251
 252 static inline int ll_crypto_hmac(struct ll_crypto_hash *tfm,
 253                                  u8 *key, unsigned int *keylen,
 254                                  struct scatterlist *sg,
 255                                  unsigned int size, u8 *result)
 256 {
 257         struct hash_desc desc;
 258         int              rv;
 259         desc.tfm   = tfm;
 260         desc.flags = 0;
 261         rv = crypto_hash_setkey(desc.tfm, key, *keylen);
 262         if (rv) {
 263                 CERROR("failed to hash setkey: %d\n", rv);
 264                 return rv;
 265         }
 266         return crypto_hash_digest(&desc, sg, size, result);
 267 }
 268 static inline
 269 unsigned int ll_crypto_tfm_alg_max_keysize(struct crypto_blkcipher *tfm)
 270 {
 271         return crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher.max_keysize;
 272 }
 273 static inline
 274 unsigned int ll_crypto_tfm_alg_min_keysize(struct crypto_blkcipher *tfm)
 275 {
 276         return crypto_blkcipher_tfm(tfm)->__crt_alg->cra_blkcipher.min_keysize;
 277 }
 278
 279 #define ll_crypto_hash_blocksize(tfm)       crypto_hash_blocksize(tfm)
 280 #define ll_crypto_hash_digestsize(tfm)      crypto_hash_digestsize(tfm)
 281 #define ll_crypto_blkcipher_ivsize(tfm)     crypto_blkcipher_ivsize(tfm)
 282 #define ll_crypto_blkcipher_blocksize(tfm)  crypto_blkcipher_blocksize(tfm)
 283 #define ll_crypto_free_hash(tfm)            crypto_free_hash(tfm)
 284 #define ll_crypto_free_blkcipher(tfm)       crypto_free_blkcipher(tfm)
 285
 286 #ifdef HAVE_SECURITY_PLUG
 287 #define ll_vfs_rmdir(dir,entry,mnt)             vfs_rmdir(dir,entry,mnt)
 288 #define ll_vfs_mkdir(inode,dir,mnt,mode)        vfs_mkdir(inode,dir,mnt,mode)
 289 #define ll_vfs_link(old,mnt,dir,new,mnt1)       vfs_link(old,mnt,dir,new,mnt1)
 290 #define ll_vfs_unlink(inode,entry,mnt)          vfs_unlink(inode,entry,mnt)
 291 #define ll_vfs_mknod(dir,entry,mnt,mode,dev)            \
 292                 vfs_mknod(dir,entry,mnt,mode,dev)
 293 #define ll_vfs_rename(old,old_dir,mnt,new,new_dir,mnt1) \
 294                 vfs_rename(old,old_dir,mnt,new,new_dir,mnt1)
 295 #else
 296 #define ll_vfs_rmdir(dir,entry,mnt)             vfs_rmdir(dir,entry)
 297 #define ll_vfs_mkdir(inode,dir,mnt,mode)        vfs_mkdir(inode,dir,mode)
 298 #define ll_vfs_link(old,mnt,dir,new,mnt1)       vfs_link(old,dir,new)
 299 #define ll_vfs_unlink(inode,entry,mnt)          vfs_unlink(inode,entry)
 300 #define ll_vfs_mknod(dir,entry,mnt,mode,dev)    vfs_mknod(dir,entry,mode,dev)
 301 #define ll_vfs_rename(old,old_dir,mnt,new,new_dir,mnt1) \
 302                 vfs_rename(old,old_dir,new,new_dir)
 303 #endif /* HAVE_SECURITY_PLUG */
 304
 305 #ifdef for_each_possible_cpu
 306 #define cfs_for_each_possible_cpu(cpu) for_each_possible_cpu(cpu)
 307 #elif defined(for_each_cpu)
 308 #define cfs_for_each_possible_cpu(cpu) for_each_cpu(cpu)
 309 #endif
 310
 311 #ifdef HAVE_BIO_ENDIO_2ARG
 312 #define cfs_bio_io_error(a,b)   bio_io_error((a))
 313 #define cfs_bio_endio(a,b,c)    bio_endio((a),(c))
 314 #else
 315 #define cfs_bio_io_error(a,b)   bio_io_error((a),(b))
 316 #define cfs_bio_endio(a,b,c)    bio_endio((a),(b),(c))
 317 #endif
 318
 319 #ifdef HAVE_FS_STRUCT_USE_PATH
 320 #define cfs_fs_pwd(fs)       ((fs)->pwd.dentry)
 321 #define cfs_fs_mnt(fs)       ((fs)->pwd.mnt)
 322 #define cfs_path_put(nd)     path_put(&(nd)->path)
 323 #else
 324 #define cfs_fs_pwd(fs)       ((fs)->pwd)
 325 #define cfs_fs_mnt(fs)       ((fs)->pwdmnt)
 326 #define cfs_path_put(nd)     path_release(nd)
 327 #endif
 328
 329 #ifndef HAVE_SIMPLE_SETATTR
 330 #define simple_setattr(dentry, ops) inode_setattr((dentry)->d_inode, ops)
 331 #endif
 332
 333 #ifndef SLAB_DESTROY_BY_RCU
 334 #define SLAB_DESTROY_BY_RCU 0
 335 #endif
 336
 337 static inline int
 338 ll_quota_on(struct super_block *sb, int off, int ver, char *name, int remount)
 339 {
 340         int rc;
 341
 342         if (sb->s_qcop->quota_on) {
 343 #ifdef HAVE_QUOTA_ON_USE_PATH
 344                 struct path path;
 345
 346                 rc = kern_path(name, LOOKUP_FOLLOW, &path);
 347                 if (!rc)
 348                         return rc;
 349 #endif
 350                 rc = sb->s_qcop->quota_on(sb, off, ver
 351 #ifdef HAVE_QUOTA_ON_USE_PATH
 352                                             , &path
 353 #else
 354                                             , name
 355 #endif
 356 #ifdef HAVE_QUOTA_ON_5ARGS
 357                                             , remount
 358 #endif
 359                                            );
 360 #ifdef HAVE_QUOTA_ON_USE_PATH
 361                 path_put(&path);
 362 #endif
 363                 return rc;
 364         }
 365         else
 366                 return -ENOSYS;
 367 }
 368
 369 static inline int ll_quota_off(struct super_block *sb, int off, int remount)
 370 {
 371         if (sb->s_qcop->quota_off) {
 372                 return sb->s_qcop->quota_off(sb, off
 373 #ifdef HAVE_QUOTA_OFF_3ARGS
 374                                              , remount
 375 #endif
 376                                             );
 377         }
 378         else
 379                 return -ENOSYS;
 380 }
 381
 382 #ifndef HAVE_DQUOT_SUSPEND
 383 # define ll_vfs_dq_init             vfs_dq_init
 384 # define ll_vfs_dq_drop             vfs_dq_drop
 385 # define ll_vfs_dq_transfer         vfs_dq_transfer
 386 # define ll_vfs_dq_off(sb, remount) vfs_dq_off(sb, remount)
 387 #else
 388 # define ll_vfs_dq_init             dquot_initialize
 389 # define ll_vfs_dq_drop             dquot_drop
 390 # define ll_vfs_dq_transfer         dquot_transfer
 391 # define ll_vfs_dq_off(sb, remount) dquot_suspend(sb, -1)
 392 #endif
 393
 394 #ifndef HAVE_BLKDEV_GET_BY_DEV
 395 # define blkdev_get_by_dev(dev, mode, holder) open_by_devnum(dev, mode)
 396 #endif
 397
 398 #ifndef HAVE_BLK_QUEUE_MAX_SEGMENTS
 399 #define blk_queue_max_segments(rq, seg)                      \
 400         do { blk_queue_max_phys_segments(rq, seg);           \
 401              blk_queue_max_hw_segments(rq, seg); } while (0)
 402 #else
 403 #define queue_max_phys_segments(rq)       queue_max_segments(rq)
 404 #define queue_max_hw_segments(rq)         queue_max_segments(rq)
 405 #endif
 406
 407 #ifdef HAVE_KMAP_ATOMIC_HAS_1ARG
 408 #define ll_kmap_atomic(a, b)    kmap_atomic(a)
 409 #define ll_kunmap_atomic(a, b)  kunmap_atomic(a)
 410 #else
 411 #define ll_kmap_atomic(a, b)    kmap_atomic(a, b)
 412 #define ll_kunmap_atomic(a, b)  kunmap_atomic(a, b)
 413 #endif
 414
 415 #ifndef HAVE_CLEAR_INODE
 416 #define clear_inode(i)          end_writeback(i)
 417 #endif
 418
 419 #ifdef HAVE_DENTRY_D_ALIAS_HLIST
 420 #define ll_d_hlist_node hlist_node
 421 #define ll_d_hlist_empty(list) hlist_empty(list)
 422 #define ll_d_hlist_entry(ptr, type, name) hlist_entry(ptr.first, type, name)
 423 #define ll_d_hlist_for_each(tmp, i_dentry) hlist_for_each(tmp, i_dentry)
 424 #define ll_d_hlist_for_each_entry(dentry, p, i_dentry, alias) \
 425         hlist_for_each_entry(dentry, p, i_dentry, alias)
 426 #else
 427 #define ll_d_hlist_node list_head
 428 #define ll_d_hlist_empty(list) list_empty(list)
 429 #define ll_d_hlist_entry(ptr, type, name) list_entry(ptr.next, type, name)
 430 #define ll_d_hlist_for_each(tmp, i_dentry) list_for_each(tmp, i_dentry)
 431 #define ll_d_hlist_for_each_entry(dentry, p, i_dentry, alias) \
 432         p = NULL; list_for_each_entry(dentry, i_dentry, alias)
 433 #endif
 434
 435
 436 #ifndef HAVE_BI_HW_SEGMENTS
 437 #define bio_hw_segments(q, bio) 0
 438 #endif
 439
 440 #ifndef QUOTA_OK
 441 # define QUOTA_OK 0
 442 #endif
 443 #ifndef NO_QUOTA
 444 # define NO_QUOTA (-EDQUOT)
 445 #endif
 446
 447 #ifndef SEEK_DATA
 448 #define SEEK_DATA      3       /* seek to the next data */
 449 #endif
 450 #ifndef SEEK_HOLE
 451 #define SEEK_HOLE      4       /* seek to the next hole */
 452 #endif
 453
 454 #ifndef FMODE_UNSIGNED_OFFSET
 455 #define FMODE_UNSIGNED_OFFSET   ((__force fmode_t)0x2000)
 456 #endif
 457
 458 #if !defined(_ASM_GENERIC_BITOPS_EXT2_NON_ATOMIC_H_) && !defined(ext2_set_bit)
 459 # define ext2_set_bit             __test_and_set_bit_le
 460 # define ext2_clear_bit           __test_and_clear_bit_le
 461 # define ext2_test_bit            test_bit_le
 462 # define ext2_find_first_zero_bit find_first_zero_bit_le
 463 # define ext2_find_next_zero_bit  find_next_zero_bit_le
 464 #endif
 465
 466 #ifdef ATTR_TIMES_SET
 467 # define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
 468 #else
 469 # define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET)
 470 #endif
 471
 472 #ifndef HAVE_LM_XXX_LOCK_MANAGER_OPS
 473 # define lm_compare_owner       fl_compare_owner
 474 #endif
 475
 476 /*
 477  * After 3.1, kernel's nameidata.intent.open.flags is different
 478  * with lustre's lookup_intent.it_flags, as lustre's it_flags'
 479  * lower bits equal to FMODE_xxx while kernel doesn't transliterate
 480  * lower bits of nameidata.intent.open.flags to FMODE_xxx.
 481  * */
 482 #include <linux/version.h>
 483 static inline int ll_namei_to_lookup_intent_flag(int flag)
 484 {
 485 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
 486         flag = (flag & ~O_ACCMODE) | OPEN_FMODE(flag);
 487 #endif
 488         return flag;
 489 }
 490
 491 #ifdef HAVE_VOID_MAKE_REQUEST_FN
 492 # define ll_mrf_ret void
 493 # define LL_MRF_RETURN(rc)
 494 #else
 495 # define ll_mrf_ret int
 496 # define LL_MRF_RETURN(rc) RETURN(rc)
 497 #endif
 498
 499 #include <linux/fs.h>
 500 #ifndef HAVE_PROTECT_I_NLINK
 501 static inline void set_nlink(struct inode *inode, unsigned int nlink)
 502 {
 503         inode->i_nlink = nlink;
 504 }
 505 #endif
 506
 507 #ifdef HAVE_INODEOPS_USE_UMODE_T
 508 # define ll_umode_t     umode_t
 509 #else
 510 # define ll_umode_t     int
 511 #endif
 512
 513 #include <linux/dcache.h>
 514 #ifndef HAVE_D_MAKE_ROOT
 515 static inline struct dentry *d_make_root(struct inode *root)
 516 {
 517         struct dentry *res = d_alloc_root(root);
 518
 519         if (res == NULL && root)
 520                 iput(root);
 521
 522         return res;
 523 }
 524 #endif
 525
 526 #ifdef HAVE_DIRTY_INODE_HAS_FLAG
 527 # define ll_dirty_inode(inode, flag)    (inode)->i_sb->s_op->dirty_inode((inode), flag)
 528 #else
 529 # define ll_dirty_inode(inode, flag)    (inode)->i_sb->s_op->dirty_inode((inode))
 530 #endif
 531
 532 #endif /* _COMPAT25_H */