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 /*
  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
  67 #define GROUP_AT(gi, i) ((gi)->small_block[(i)])
  68
  69 static inline int cleanup_group_info(void)
  70 {
  71         /* Get rid of unneeded supplementary groups */
  72         current->ngroups = 0;
  73         memset(current->groups, 0, sizeof(current->groups));
  74         return 0;
  75 }
  76
  77 #else /* >= 2.6.4 */
  78
  79 #define current_ngroups current->group_info->ngroups
  80
  81 void groups_sort(struct group_info *ginfo);
  82 int groups_search(struct group_info *ginfo, gid_t grp);
  83
  84 static inline int cleanup_group_info(void)
  85 {
  86         struct group_info *ginfo;
  87
  88         ginfo = groups_alloc(0);
  89         if (!ginfo)
  90                 return -ENOMEM;
  91
  92         set_current_groups(ginfo);
  93         put_group_info(ginfo);
  94
  95         return 0;
  96 }
  97 #endif /* end of groups_info stuff */
  98
  99
 100 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
 101
 102 /*
 103  * OBD need working random driver, thus all our
 104  * initialization routines must be called after device
 105  * driver initialization
 106  */
 107 #ifndef MODULE
 108 #undef module_init
 109 #define module_init(a)     late_initcall(a)
 110 #endif
 111
 112 /* XXX our code should be using the 2.6 calls, not the other way around */
 113 #define TryLockPage(page)                TestSetPageLocked(page)
 114 #define filemap_fdatasync(mapping)       filemap_fdatawrite(mapping)
 115 #define Page_Uptodate(page)              PageUptodate(page)
 116
 117 #define KDEVT_INIT(val)                 (val)
 118
 119 #define LTIME_S(time)                   (time.tv_sec)
 120 #define ll_path_lookup                  path_lookup
 121 #define ll_permission(inode,mask,nd)    permission(inode,mask,nd)
 122
 123 #define ll_pgcache_lock(mapping)          spin_lock(&mapping->page_lock)
 124 #define ll_pgcache_unlock(mapping)        spin_unlock(&mapping->page_lock)
 125 #define ll_call_writepage(inode, page)  \
 126                                 (inode)->i_mapping->a_ops->writepage(page, NULL)
 127 #define ll_invalidate_inode_pages(inode) \
 128                                 invalidate_inode_pages((inode)->i_mapping)
 129 #define ll_truncate_complete_page(page) \
 130                                 truncate_complete_page(page->mapping, page)
 131
 132 #define ll_vfs_create(a,b,c,d)              vfs_create(a,b,c,d)
 133
 134 #define ll_dev_t                        dev_t
 135 #define kdev_t                          dev_t
 136 #define to_kdev_t(dev)                  (dev)
 137 #define kdev_t_to_nr(dev)               (dev)
 138 #define val_to_kdev(dev)                (dev)
 139 #define ILOOKUP(sb, ino, test, data)    ilookup5(sb, ino, test, data);
 140
 141 #include <linux/writeback.h>
 142
 143 static inline void lustre_daemonize_helper(void)
 144 {
 145         LASSERT(current->signal != NULL);
 146         current->signal->session = 1;
 147         if (current->group_leader)
 148                 current->group_leader->signal->pgrp = 1;
 149         else
 150                 CERROR("we aren't group leader\n");
 151         current->signal->tty = NULL;
 152 }
 153
 154 #define smp_num_cpus    NR_CPUS
 155
 156 #include <linux/proc_fs.h>
 157
 158 #else /* 2.4.. */
 159
 160 #define ll_vfs_create(a,b,c,d)              vfs_create(a,b,c)
 161 #define ll_permission(inode,mask,nd)        permission(inode,mask)
 162 #define ILOOKUP(sb, ino, test, data)        ilookup4(sb, ino, test, data);
 163 #define DCACHE_DISCONNECTED                 DCACHE_NFSD_DISCONNECTED
 164 #define ll_dev_t                            int
 165
 166 static inline void clear_page_dirty(struct page *page)
 167 {
 168         if (PageDirty(page))
 169                 ClearPageDirty(page);
 170 }
 171
 172 /* 2.5 uses hlists for some things, like the d_hash.  we'll treat them
 173  * as 2.5 and let macros drop back.. */
 174 #ifndef HLIST_HEAD /* until we get a kernel newer than l28 */
 175 #define hlist_entry                     list_entry
 176 #define hlist_head                      list_head
 177 #define hlist_node                      list_head
 178 #define HLIST_HEAD                      LIST_HEAD
 179 #define INIT_HLIST_HEAD                 INIT_LIST_HEAD
 180 #define hlist_del_init                  list_del_init
 181 #define hlist_add_head                  list_add
 182 #define hlist_for_each_safe             list_for_each_safe
 183 #endif
 184 #define KDEVT_INIT(val)                 (val)
 185 #define ext3_xattr_set_handle           ext3_xattr_set
 186 #define extN_xattr_set_handle           extN_xattr_set
 187 #define try_module_get                  __MOD_INC_USE_COUNT
 188 #define module_put                      __MOD_DEC_USE_COUNT
 189 #define LTIME_S(time)                   (time)
 190 #if !defined(CONFIG_RH_2_4_20) && !defined(cpu_online)
 191 #define cpu_online(cpu)                 (cpu_online_map & (1<<cpu))
 192 #endif
 193
 194 static inline int ll_path_lookup(const char *path, unsigned flags,
 195                                  struct nameidata *nd)
 196 {
 197         int error = 0;
 198         if (path_init(path, flags, nd))
 199                 error = path_walk(path, nd);
 200         return error;
 201 }
 202 #define ll_permission(inode,mask,nd)    permission(inode,mask)
 203 typedef long sector_t;
 204
 205 #define ll_pgcache_lock(mapping)        spin_lock(&pagecache_lock)
 206 #define ll_pgcache_unlock(mapping)      spin_unlock(&pagecache_lock)
 207 #define ll_call_writepage(inode, page)  \
 208                                (inode)->i_mapping->a_ops->writepage(page)
 209 #define ll_invalidate_inode_pages(inode) invalidate_inode_pages(inode)
 210 #define ll_truncate_complete_page(page) truncate_complete_page(page)
 211
 212 static inline void __d_drop(struct dentry *dentry)
 213 {
 214         list_del(&dentry->d_hash);
 215         INIT_LIST_HEAD(&dentry->d_hash);
 216 }
 217
 218 static inline void lustre_daemonize_helper(void)
 219 {
 220         current->session = 1;
 221         current->pgrp = 1;
 222         current->tty = NULL;
 223 }
 224
 225 #ifndef HAVE_COND_RESCHED
 226 static inline void cond_resched(void)
 227 {
 228         if (unlikely(need_resched())) {
 229                 set_curret_state(TASK_RUNNING);
 230                 schedule();
 231         }
 232 }
 233 #endif
 234
 235 /* to find proc_dir_entry from inode. 2.6 has native one -bzzz */
 236 #ifndef HAVE_PDE
 237 #define PDE(ii)         ((ii)->u.generic_ip)
 238 #endif
 239
 240 #endif /* end of 2.4 compat macros */
 241
 242 #ifdef HAVE_PAGE_LIST
 243 static inline int mapping_has_pages(struct address_space *mapping)
 244 {
 245         int rc = 1;
 246
 247         ll_pgcache_lock(mapping);
 248         if (list_empty(&mapping->dirty_pages) &&
 249             list_empty(&mapping->clean_pages) &&
 250             list_empty(&mapping->locked_pages)) {
 251                 rc = 0;
 252         }
 253         ll_pgcache_unlock(mapping);
 254
 255         return rc;
 256 }
 257
 258 static inline int clear_page_dirty_for_io(struct page *page)
 259 {
 260         struct address_space *mapping = page->mapping;
 261
 262         if (page->mapping && PageDirty(page)) {
 263                 ClearPageDirty(page);
 264                 ll_pgcache_lock(mapping);
 265                 list_del(&page->list);
 266                 list_add(&page->list, &mapping->locked_pages);
 267                 ll_pgcache_unlock(mapping);
 268                 return 1;
 269         }
 270         return 0;
 271 }
 272 #else
 273 static inline int mapping_has_pages(struct address_space *mapping)
 274 {
 275         return mapping->nrpages > 0;
 276 }
 277 #endif
 278
 279 #endif /* __KERNEL__ */
 280 #endif /* _COMPAT25_H */