include/linux/vfs_compat.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
  24  */
  25
  26 #ifndef _ZFS_VFS_H
  27 #define _ZFS_VFS_H
  28
  29 /*
  30  * 2.6.28 API change,
  31  * Added insert_inode_locked() helper function, prior to this most callers
  32  * used insert_inode_hash().  The older method doesn't check for collisions
  33  * in the inode_hashtable but it still acceptible for use.
  34  */
  35 #ifndef HAVE_INSERT_INODE_LOCKED
  36 static inline int
  37 insert_inode_locked(struct inode *ip)
  38 {
  39         insert_inode_hash(ip);
  40         return (0);
  41 }
  42 #endif /* HAVE_INSERT_INODE_LOCKED */
  43
  44 /*
  45  * 2.6.35 API change,
  46  * Add truncate_setsize() if it is not exported by the Linux kernel.
  47  *
  48  * Truncate the inode and pages associated with the inode. The pages are
  49  * unmapped and removed from cache.
  50  */
  51 #ifndef HAVE_TRUNCATE_SETSIZE
  52 static inline void
  53 truncate_setsize(struct inode *ip, loff_t new)
  54 {
  55         struct address_space *mapping = ip->i_mapping;
  56
  57         i_size_write(ip, new);
  58
  59         unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
  60         truncate_inode_pages(mapping, new);
  61         unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
  62 }
  63 #endif /* HAVE_TRUNCATE_SETSIZE */
  64
  65 #if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER)
  66 /*
  67  * 2.6.34 API change,
  68  * Add bdi_setup_and_register() function if not yet provided by kernel.
  69  * It is used to quickly initialize and register a BDI for the filesystem.
  70  */
  71 extern atomic_long_t zfs_bdi_seq;
  72
  73 static inline int
  74 bdi_setup_and_register(struct backing_dev_info *bdi,char *name,unsigned int cap)
  75 {
  76         char tmp[32];
  77         int error;
  78
  79         bdi->name = name;
  80         bdi->capabilities = cap;
  81         error = bdi_init(bdi);
  82         if (error)
  83                 return (error);
  84
  85         sprintf(tmp, "%.28s%s", name, "-%d");
  86         error = bdi_register(bdi, NULL, tmp,
  87             atomic_long_inc_return(&zfs_bdi_seq));
  88         if (error) {
  89                 bdi_destroy(bdi);
  90                 return (error);
  91         }
  92
  93         return (error);
  94 }
  95 #endif /* HAVE_BDI && !HAVE_BDI_SETUP_AND_REGISTER */
  96
  97 #endif /* _ZFS_VFS_H */