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 _COMPAT25_H
  24 #define _COMPAT25_H
  25
  26 #ifdef __KERNEL__
  27
  28 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) && LINUX_VERSION_CODE < KERNEL_VERSION(2,5,69)
  29 #error sorry, lustre requires at least 2.5.69
  30 #endif
  31
  32 #include <libcfs/linux/portals_compat25.h>
  33
  34 /*
  35  * groups_info related staff
  36  */
  37 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,4)
  38
  39 #define NGROUPS_SMALL           NGROUPS
  40 #define NGROUPS_PER_BLOCK       ((int)(EXEC_PAGESIZE / sizeof(gid_t)))
  41 struct group_info {
  42         int        ngroups;
  43         atomic_t   usage;
  44         gid_t      small_block[NGROUPS_SMALL];
  45         int        nblocks;
  46         gid_t     *blocks[0];
  47 };
  48 #define current_ngroups current->ngroups
  49
  50 struct group_info *groups_alloc(int gidsetsize);
  51 void groups_free(struct group_info *ginfo);
  52 int groups_search(struct group_info *ginfo, gid_t grp);
  53
  54 #define get_group_info(group_info)                              \
  55         do {                                                    \
  56                 atomic_inc(&(group_info)->usage);               \
  57         } while (0)
  58
  59 #define put_group_info(group_info)                              \
  60         do {                                                    \
  61                 if (atomic_dec_and_test(&(group_info)->usage))  \
  62                         groups_free(group_info);                \
  63         } while (0)
  64
  65 #define groups_sort(gi) do {} while (0)
  66 #define GROUP_AT(gi, i) ((gi)->small_block[(i)])
  67
  68 static inline int cleanup_group_info(void)
  69 {
  70         /* Get rid of unneeded supplementary groups */
  71         current->ngroups = 0;
  72         memset(current->groups, 0, sizeof(current->groups));
  73         return 0;
  74 }
  75
  76 #else /* >= 2.6.4 */
  77
  78 #define current_ngroups current->group_info->ngroups
  79
  80 void groups_sort(struct group_info *ginfo);
  81 int groups_search(struct group_info *ginfo, gid_t grp);
  82
  83 static inline int cleanup_group_info(void)
  84 {
  85         struct group_info *ginfo;
  86
  87         ginfo = groups_alloc(0);
  88         if (!ginfo)
  89                 return -ENOMEM;
  90
  91         set_current_groups(ginfo);
  92         put_group_info(ginfo);
  93
  94         return 0;
  95 }
  96 #endif /* end of groups_info stuff */
  97
  98
  99 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
 100
 101 /* New (actually old) intent naming */
 102 #define lookup_intent open_intent
 103
 104 /* And internals */
 105 #define it_flags flags
 106 #define it_op op
 107 #define it_magic magic
 108 #define it_op_release op_release
 109 #define it_create_mode create_mode
 110
 111 /*
 112  * OBD need working random driver, thus all our
 113  * initialization routines must be called after device
 114  * driver initialization
 115  */
 116 #ifndef MODULE
 117 #undef module_init
 118 #define module_init(a)     late_initcall(a)
 119 #endif
 120
 121 /* XXX our code should be using the 2.6 calls, not the other way around */
 122 #define TryLockPage(page)                TestSetPageLocked(page)
 123 #define Page_Uptodate(page)              PageUptodate(page)
 124
 125 #define KDEVT_INIT(val)                 (val)
 126
 127 #define LTIME_S(time)                   (time.tv_sec)
 128 #define ll_path_lookup                  path_lookup
 129 #define ll_permission(inode,mask,nd)    permission(inode,mask,nd)
 130
 131 #define ll_pgcache_lock(mapping)          spin_lock(&mapping->page_lock)
 132 #define ll_pgcache_unlock(mapping)        spin_unlock(&mapping->page_lock)
 133 #define ll_call_writepage(inode, page)  \
 134                                 (inode)->i_mapping->a_ops->writepage(page, NULL)
 135 #define ll_invalidate_inode_pages(inode) \
 136                                 invalidate_inode_pages((inode)->i_mapping)
 137 #define ll_truncate_complete_page(page) \
 138                                 truncate_complete_page(page->mapping, page)
 139
 140 #define ll_vfs_create(a,b,c,d)              vfs_create(a,b,c,d)
 141
 142 #define ll_dev_t                        dev_t
 143 #define kdev_t                          dev_t
 144 #define to_kdev_t(dev)                  (dev)
 145 #define kdev_t_to_nr(dev)               (dev)
 146 #define val_to_kdev(dev)                (dev)
 147 #define ILOOKUP(sb, ino, test, data)    ilookup5(sb, ino, test, data);
 148
 149 #include <linux/writeback.h>
 150
 151 static inline void lustre_daemonize_helper(void)
 152 {
 153         LASSERT(current->signal != NULL);
 154         current->signal->session = 1;
 155         if (current->group_leader)
 156                 current->group_leader->signal->pgrp = 1;
 157         else
 158                 CERROR("we aren't group leader\n");
 159         current->signal->tty = NULL;
 160 }
 161
 162 #define __set_page_ll_data(page, llap) \
 163         do {       \
 164                 page_cache_get(page); \
 165                 SetPagePrivate(page); \
 166                 page->private = (unsigned long)llap; \
 167         } while (0)
 168 #define __clear_page_ll_data(page) \
 169         do {       \
 170                 ClearPagePrivate(page); \
 171                 page_cache_release(page); \
 172                 page->private = 0; \
 173         } while(0)
 174
 175 #ifndef smp_num_cpus
 176 #define smp_num_cpus    num_online_cpus()
 177 #endif
 178
 179 #define kiobuf bio
 180
 181 #include <linux/proc_fs.h>
 182
 183 #else /* 2.4.. */
 184
 185 #define ll_vfs_create(a,b,c,d)              vfs_create(a,b,c)
 186 #define ll_permission(inode,mask,nd)        permission(inode,mask)
 187 #define ILOOKUP(sb, ino, test, data)        ilookup4(sb, ino, test, data);
 188 #define DCACHE_DISCONNECTED                 DCACHE_NFSD_DISCONNECTED
 189 #define ll_dev_t                            int
 190
 191 static inline void clear_page_dirty(struct page *page)
 192 {
 193         if (PageDirty(page))
 194                 ClearPageDirty(page);
 195 }
 196
 197 /* 2.5 uses hlists for some things, like the d_hash.  we'll treat them
 198  * as 2.5 and let macros drop back.. */
 199 #ifndef HLIST_HEAD /* until we get a kernel newer than l28 */
 200 #define hlist_entry                     list_entry
 201 #define hlist_head                      list_head
 202 #define hlist_node                      list_head
 203 #define HLIST_HEAD                      LIST_HEAD
 204 #define INIT_HLIST_HEAD                 INIT_LIST_HEAD
 205 #define hlist_del_init                  list_del_init
 206 #define hlist_add_head                  list_add
 207 #define hlist_for_each_safe             list_for_each_safe
 208 #endif
 209 #define KDEVT_INIT(val)                 (val)
 210 #define ext3_xattr_set_handle           ext3_xattr_set
 211 #define extN_xattr_set_handle           extN_xattr_set
 212 #define try_module_get                  __MOD_INC_USE_COUNT
 213 #define module_put                      __MOD_DEC_USE_COUNT
 214 #define LTIME_S(time)                   (time)
 215 #if !defined(CONFIG_RH_2_4_20) && !defined(cpu_online)
 216 #define cpu_online(cpu)                 (cpu_online_map & (1<<cpu))
 217 #endif
 218
 219 static inline int ll_path_lookup(const char *path, unsigned flags,
 220                                  struct nameidata *nd)
 221 {
 222         int error = 0;
 223         if (path_init(path, flags, nd))
 224                 error = path_walk(path, nd);
 225         return error;
 226 }
 227 #define ll_permission(inode,mask,nd)    permission(inode,mask)
 228 typedef long sector_t;
 229
 230 #define ll_pgcache_lock(mapping)        spin_lock(&pagecache_lock)
 231 #define ll_pgcache_unlock(mapping)      spin_unlock(&pagecache_lock)
 232 #define ll_call_writepage(inode, page)  \
 233                                (inode)->i_mapping->a_ops->writepage(page)
 234 #define filemap_fdatawrite(mapping)      filemap_fdatasync(mapping)
 235 #define ll_invalidate_inode_pages(inode) invalidate_inode_pages(inode)
 236 #define ll_truncate_complete_page(page) truncate_complete_page(page)
 237
 238 static inline void __d_drop(struct dentry *dentry)
 239 {
 240         list_del(&dentry->d_hash);
 241         INIT_LIST_HEAD(&dentry->d_hash);
 242 }
 243
 244 static inline void lustre_daemonize_helper(void)
 245 {
 246         current->session = 1;
 247         current->pgrp = 1;
 248         current->tty = NULL;
 249 }
 250
 251 #ifndef HAVE_COND_RESCHED
 252 static inline void cond_resched(void)
 253 {
 254         if (unlikely(need_resched())) {
 255                 set_current_state(TASK_RUNNING);
 256                 schedule();
 257         }
 258 }
 259 #endif
 260
 261 static inline int mapping_mapped(struct address_space *mapping)
 262 {
 263         if (mapping->i_mmap_shared)
 264                 return 1;
 265         if (mapping->i_mmap)
 266                 return 1;
 267         return 0;
 268 }
 269
 270 /* to find proc_dir_entry from inode. 2.6 has native one -bzzz */
 271 #ifndef HAVE_PDE
 272 #define PDE(ii)         ((ii)->u.generic_ip)
 273 #endif
 274
 275 #define __set_page_ll_data(page, llap) page->private = (unsigned long)llap
 276 #define __clear_page_ll_data(page) page->private = 0
 277 #define PageWriteback(page) 0
 278 #define set_page_writeback(page) do {} while (0)
 279 #define end_page_writeback(page) do {} while (0)
 280
 281 #define end_page_writeback(page)
 282
 283 #ifdef ZAP_PAGE_RANGE_VMA
 284 #define ll_zap_page_range(vma, addr, len)  zap_page_range(vma, addr, len)
 285 #else
 286 #define ll_zap_page_range(vma, addr, len)  zap_page_range(vma->vm_mm, addr, len)
 287 #endif
 288
 289 #endif /* end of 2.4 compat macros */
 290
 291 #ifdef HAVE_PAGE_LIST
 292 static inline int mapping_has_pages(struct address_space *mapping)
 293 {
 294         int rc = 1;
 295
 296         ll_pgcache_lock(mapping);
 297         if (list_empty(&mapping->dirty_pages) &&
 298             list_empty(&mapping->clean_pages) &&
 299             list_empty(&mapping->locked_pages)) {
 300                 rc = 0;
 301         }
 302         ll_pgcache_unlock(mapping);
 303
 304         return rc;
 305 }
 306
 307 static inline int clear_page_dirty_for_io(struct page *page)
 308 {
 309         struct address_space *mapping = page->mapping;
 310
 311         if (page->mapping && PageDirty(page)) {
 312                 ClearPageDirty(page);
 313                 ll_pgcache_lock(mapping);
 314                 list_del(&page->list);
 315                 list_add(&page->list, &mapping->locked_pages);
 316                 ll_pgcache_unlock(mapping);
 317                 return 1;
 318         }
 319         return 0;
 320 }
 321 #else
 322 static inline int mapping_has_pages(struct address_space *mapping)
 323 {
 324         return mapping->nrpages > 0;
 325 }
 326 #endif
 327
 328 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,7))
 329 #define ll_set_dflags(dentry, flags) do { dentry->d_vfs_flags |= flags; } while(0)
 330 #define ll_vfs_symlink(dir, dentry, path, mode) vfs_symlink(dir, dentry, path)
 331 #else
 332 #define ll_set_dflags(dentry, flags) do { \
 333                 spin_lock(&dentry->d_lock); \
 334                 dentry->d_flags |= flags; \
 335                 spin_unlock(&dentry->d_lock); \
 336         } while(0)
 337 #define ll_vfs_symlink(dir, dentry, path, mode) vfs_symlink(dir, dentry, path, mode)
 338 #endif
 339
 340 #ifndef container_of
 341 #define container_of(ptr, type, member) ({                      \
 342                 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
 343                 (type *)( (char *)__mptr - offsetof(type,member) );})
 344 #endif
 345
 346 #ifdef HAVE_I_ALLOC_SEM
 347 #define UP_WRITE_I_ALLOC_SEM(i) do { up_write(&(i)->i_alloc_sem); } while (0)
 348 #define DOWN_WRITE_I_ALLOC_SEM(i) do { down_write(&(i)->i_alloc_sem); } while(0)
 349 #define LASSERT_MDS_ORPHAN_WRITE_LOCKED(i) LASSERT(down_read_trylock(&(i)->i_alloc_sem) == 0)
 350
 351 #define UP_READ_I_ALLOC_SEM(i) do { up_read(&(i)->i_alloc_sem); } while (0)
 352 #define DOWN_READ_I_ALLOC_SEM(i) do { down_read(&(i)->i_alloc_sem); } while (0)
 353 #define LASSERT_MDS_ORPHAN_READ_LOCKED(i) LASSERT(down_write_trylock(&(i)->i_alloc_sem) == 0)
 354 #define MDS_PACK_MD_LOCK 1
 355 #else
 356 #define UP_READ_I_ALLOC_SEM(i) do { up(&(i)->i_sem); } while (0)
 357 #define DOWN_READ_I_ALLOC_SEM(i) do { down(&(i)->i_sem); } while (0)
 358 #define LASSERT_MDS_ORPHAN_READ_LOCKED(i) LASSERT(down_trylock(&(i)->i_sem) != 0)
 359
 360 #define UP_WRITE_I_ALLOC_SEM(i) do { up(&(i)->i_sem); } while (0)
 361 #define DOWN_WRITE_I_ALLOC_SEM(i) do { down(&(i)->i_sem); } while (0)
 362 #define LASSERT_MDS_ORPHAN_WRITE_LOCKED(i) LASSERT(down_trylock(&(i)->i_sem) != 0)
 363 #define MDS_PACK_MD_LOCK 0
 364 #endif
 365
 366 #endif /* __KERNEL__ */
 367 #endif /* _COMPAT25_H */