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 smp_num_cpus    NR_CPUS
 104
 105 #include <linux/proc_fs.h>
 106
 107 #else /* 2.4.. */
 108
 109 #define ll_vfs_create(a,b,c,d)              vfs_create(a,b,c)
 110 #define ll_permission(inode,mask,nd)        permission(inode,mask)
 111 #define ILOOKUP(sb, ino, test, data)        ilookup4(sb, ino, test, data);
 112 #define DCACHE_DISCONNECTED                 DCACHE_NFSD_DISCONNECTED
 113 #define ll_dev_t                            int
 114
 115 static inline void clear_page_dirty(struct page *page)
 116 {
 117         if (PageDirty(page))
 118                 ClearPageDirty(page);
 119 }
 120
 121 /* 2.5 uses hlists for some things, like the d_hash.  we'll treat them
 122  * as 2.5 and let macros drop back.. */
 123 #ifndef HLIST_HEAD /* until we get a kernel newer than l28 */
 124 #define hlist_entry                     list_entry
 125 #define hlist_head                      list_head
 126 #define hlist_node                      list_head
 127 #define HLIST_HEAD                      LIST_HEAD
 128 #define INIT_HLIST_HEAD                 INIT_LIST_HEAD
 129 #define hlist_del_init                  list_del_init
 130 #define hlist_add_head                  list_add
 131 #define hlist_for_each_safe             list_for_each_safe
 132 #endif
 133 #define KDEVT_INIT(val)                 (val)
 134 #define ext3_xattr_set_handle           ext3_xattr_set
 135 #define extN_xattr_set_handle           extN_xattr_set
 136 #define try_module_get                  __MOD_INC_USE_COUNT
 137 #define module_put                      __MOD_DEC_USE_COUNT
 138 #define LTIME_S(time)                   (time)
 139 #if !defined(CONFIG_RH_2_4_20) && !defined(cpu_online)
 140 #define cpu_online(cpu)                 (cpu_online_map & (1<<cpu))
 141 #endif
 142
 143 static inline int ll_path_lookup(const char *path, unsigned flags,
 144                                  struct nameidata *nd)
 145 {
 146         int error = 0;
 147         if (path_init(path, flags, nd))
 148                 error = path_walk(path, nd);
 149         return error;
 150 }
 151 #define ll_permission(inode,mask,nd)    permission(inode,mask)
 152 typedef long sector_t;
 153
 154 #define ll_pgcache_lock(mapping)        spin_lock(&pagecache_lock)
 155 #define ll_pgcache_unlock(mapping)      spin_unlock(&pagecache_lock)
 156 #define ll_call_writepage(inode, page)  \
 157                                (inode)->i_mapping->a_ops->writepage(page)
 158 #define ll_invalidate_inode_pages(inode) invalidate_inode_pages(inode)
 159 #define ll_truncate_complete_page(page) truncate_complete_page(page)
 160
 161 static inline void __d_drop(struct dentry *dentry)
 162 {
 163         list_del(&dentry->d_hash);
 164         INIT_LIST_HEAD(&dentry->d_hash);
 165 }
 166
 167 static inline void lustre_daemonize_helper(void)
 168 {
 169         current->session = 1;
 170         current->pgrp = 1;
 171         current->tty = NULL;
 172 }
 173
 174 static inline int cleanup_group_info(void)
 175 {
 176         /* Get rid of unneeded supplementary groups */
 177         current->ngroups = 0;
 178         memset(current->groups, 0, sizeof(current->groups));
 179         return 0;
 180 }
 181
 182 #ifndef HAVE_COND_RESCHED
 183 static inline void cond_resched(void)
 184 {
 185         if (unlikely(need_resched())) {
 186                 set_curret_state(TASK_RUNNING);
 187                 schedule();
 188         }
 189 }
 190 #endif
 191
 192 /* to find proc_dir_entry from inode. 2.6 has native one -bzzz */
 193 #ifndef HAVE_PDE
 194 #define PDE(ii)         ((ii)->u.generic_ip)
 195 #endif
 196
 197 #endif /* end of 2.4 compat macros */
 198
 199 #ifdef HAVE_PAGE_LIST
 200 static inline int mapping_has_pages(struct address_space *mapping)
 201 {
 202         int rc = 1;
 203
 204         ll_pgcache_lock(mapping);
 205         if (list_empty(&mapping->dirty_pages) &&
 206             list_empty(&mapping->clean_pages) &&
 207             list_empty(&mapping->locked_pages)) {
 208                 rc = 0;
 209         }
 210         ll_pgcache_unlock(mapping);
 211
 212         return rc;
 213 }
 214
 215 static inline int clear_page_dirty_for_io(struct page *page)
 216 {
 217         struct address_space *mapping = page->mapping;
 218
 219         if (page->mapping && PageDirty(page)) {
 220                 ClearPageDirty(page);
 221                 ll_pgcache_lock(mapping);
 222                 list_del(&page->list);
 223                 list_add(&page->list, &mapping->locked_pages);
 224                 ll_pgcache_unlock(mapping);
 225                 return 1;
 226         }
 227         return 0;
 228 }
 229 #else
 230 static inline int mapping_has_pages(struct address_space *mapping)
 231 {
 232         return mapping->nrpages > 0;
 233 }
 234 #endif
 235
 236 #endif /* __KERNEL__ */
 237 #endif /* _COMPAT25_H */