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