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 /*
  98  * 3.2-rc1 API change,
  99  * Add set_nlink() if it is not exported by the Linux kernel.
 100  *
 101  * i_nlink is read-only in Linux 3.2, but it can be set directly in
 102  * earlier kernels.
 103  */
 104 #ifndef HAVE_SET_NLINK
 105 static inline void
 106 set_nlink(struct inode *inode, unsigned int nlink)
 107 {
 108         inode->i_nlink = nlink;
 109 }
 110 #endif /* HAVE_SET_NLINK */
 111
 112 /*
 113  * 3.3 API change,
 114  * The VFS .create, .mkdir and .mknod callbacks were updated to take a
 115  * umode_t type rather than an int.  To cleanly handle both definitions
 116  * the zpl_umode_t type is introduced and set accordingly.
 117  */
 118 #ifdef HAVE_CREATE_UMODE_T
 119 typedef umode_t         zpl_umode_t;
 120 #else
 121 typedef int             zpl_umode_t;
 122 #endif
 123
 124 /*
 125  * 3.5 API change,
 126  * The clear_inode() function replaces end_writeback() and introduces an
 127  * ordering change regarding when the inode_sync_wait() occurs.  See the
 128  * configure check in config/kernel-clear-inode.m4 for full details.
 129  */
 130 #if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
 131 #define clear_inode(ip)         end_writeback(ip)
 132 #endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
 133
 134 /*
 135  * 3.6 API change,
 136  * The sget() helper function now takes the mount flags as an argument.
 137  */
 138 #ifdef HAVE_5ARG_SGET
 139 #define zpl_sget(type, cmp, set, fl, mtd)       sget(type, cmp, set, fl, mtd)
 140 #else
 141 #define zpl_sget(type, cmp, set, fl, mtd)       sget(type, cmp, set, mtd)
 142 #endif /* HAVE_5ARG_SGET */
 143
 144 #endif /* _ZFS_VFS_H */