lustre/include/linux/lustre_patchless_compat.h

   1 #ifndef LUSTRE_PATCHLESS_COMPAT_H
   2 #define LUSTRE_PATCHLESS_COMPAT_H
   3
   4 #include <linux/lustre_version.h>
   5 #ifndef LUSTRE_KERNEL_VERSION
   6 #include <linux/fs.h>
   7
   8 #ifndef HAVE_TRUNCATE_COMPLETE_PAGE
   9 #include <linux/list.h>
  10 #include <linux/mm.h>
  11 #include <linux/hash.h>
  12
  13 /* XXX copy & paste from 2.6.15 kernel */
  14 static inline void ll_remove_from_page_cache(struct page *page)
  15 {
  16         struct address_space *mapping = page->mapping;
  17
  18         BUG_ON(!PageLocked(page));
  19
  20 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
  21         write_lock_irq(&mapping->tree_lock);
  22 #else
  23         spin_lock_irq(&mapping->tree_lock);
  24 #endif
  25         radix_tree_delete(&mapping->page_tree, page->index);
  26         page->mapping = NULL;
  27         mapping->nrpages--;
  28 #ifdef HAVE_NR_PAGECACHE
  29         atomic_add(-1, &nr_pagecache); // XXX pagecache_acct(-1);
  30 #else
  31         __dec_zone_page_state(page, NR_FILE_PAGES);
  32 #endif
  33 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
  34         write_unlock_irq(&mapping->tree_lock);
  35 #else
  36         spin_unlock_irq(&mapping->tree_lock);
  37 #endif
  38 }
  39
  40 static inline void
  41 truncate_complete_page(struct address_space *mapping, struct page *page)
  42 {
  43         if (page->mapping != mapping)
  44                 return;
  45
  46         if (PagePrivate(page))
  47                 page->mapping->a_ops->invalidatepage(page, 0);
  48
  49         clear_page_dirty(page);
  50         ClearPageUptodate(page);
  51         ClearPageMappedToDisk(page);
  52         ll_remove_from_page_cache(page);
  53         page_cache_release(page);       /* pagecache ref */
  54 }
  55 #endif
  56
  57 /* megahack */
  58 static inline void d_rehash_cond(struct dentry * entry, int lock)
  59 {
  60         if (!lock)
  61                 spin_unlock(&dcache_lock);
  62
  63         d_rehash(entry);
  64
  65         if (!lock)
  66                 spin_lock(&dcache_lock);
  67 }
  68
  69 #define __d_rehash(dentry, lock) d_rehash_cond(dentry, lock)
  70
  71 #define LUSTRE_PATCHLESS
  72
  73 #ifndef ATTR_FROM_OPEN
  74 #define ATTR_FROM_OPEN 0
  75 #endif
  76 #ifndef ATTR_RAW
  77 #define ATTR_RAW 0
  78 #endif
  79
  80 #endif /* LUSTRE_KERNEL_VERSION */
  81
  82 #endif