[mirror_zfs.git] / include / linux / vfs_compat.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
 */

#ifndef _ZFS_VFS_H
#define _ZFS_VFS_H

/*
 * 2.6.28 API change,
 * Added insert_inode_locked() helper function, prior to this most callers
 * used insert_inode_hash().  The older method doesn't check for collisions
 * in the inode_hashtable but it still acceptible for use.
 */
#ifndef HAVE_INSERT_INODE_LOCKED
static inline int
insert_inode_locked(struct inode *ip)
{
	insert_inode_hash(ip);
	return (0);
}
#endif /* HAVE_INSERT_INODE_LOCKED */

/*
 * 2.6.35 API change,
 * Add truncate_setsize() if it is not exported by the Linux kernel.
 *
 * Truncate the inode and pages associated with the inode. The pages are
 * unmapped and removed from cache.
 */
#ifndef HAVE_TRUNCATE_SETSIZE
static inline void
truncate_setsize(struct inode *ip, loff_t new)
{
	struct address_space *mapping = ip->i_mapping;

	i_size_write(ip, new);

	unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
	truncate_inode_pages(mapping, new);
	unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
}
#endif /* HAVE_TRUNCATE_SETSIZE */

#if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER)
/*
 * 2.6.34 API change,
 * Add bdi_setup_and_register() function if not yet provided by kernel.
 * It is used to quickly initialize and register a BDI for the filesystem.
 */
extern atomic_long_t zfs_bdi_seq;

static inline int
bdi_setup_and_register(struct backing_dev_info *bdi,char *name,unsigned int cap)
{
	char tmp[32];
	int error;

	bdi->name = name;
	bdi->capabilities = cap;
	error = bdi_init(bdi);
	if (error)
		return (error);

	sprintf(tmp, "%.28s%s", name, "-%d");
	error = bdi_register(bdi, NULL, tmp,
	    atomic_long_inc_return(&zfs_bdi_seq));
	if (error) {
		bdi_destroy(bdi);
		return (error);
	}

	return (error);
}
#endif /* HAVE_BDI && !HAVE_BDI_SETUP_AND_REGISTER */

/*
 * 3.2-rc1 API change,
 * Add set_nlink() if it is not exported by the Linux kernel.
 *
 * i_nlink is read-only in Linux 3.2, but it can be set directly in
 * earlier kernels.
 */
#ifndef HAVE_SET_NLINK
static inline void
set_nlink(struct inode *inode, unsigned int nlink)
{
	inode->i_nlink = nlink;
}
#endif /* HAVE_SET_NLINK */

/*
 * 3.3 API change,
 * The VFS .create, .mkdir and .mknod callbacks were updated to take a
 * umode_t type rather than an int.  To cleanly handle both definitions
 * the zpl_umode_t type is introduced and set accordingly.
 */
#ifdef HAVE_CREATE_UMODE_T
typedef	umode_t		zpl_umode_t;
#else
typedef	int		zpl_umode_t;
#endif

/*
 * 3.5 API change,
 * The clear_inode() function replaces end_writeback() and introduces an
 * ordering change regarding when the inode_sync_wait() occurs.  See the
 * configure check in config/kernel-clear-inode.m4 for full details.
 */
#if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
#define clear_inode(ip)		end_writeback(ip)
#endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */

/*
 * 3.6 API change,
 * The sget() helper function now takes the mount flags as an argument.
 */
#ifdef HAVE_5ARG_SGET
#define zpl_sget(type, cmp, set, fl, mtd)	sget(type, cmp, set, fl, mtd)
#else
#define zpl_sget(type, cmp, set, fl, mtd)	sget(type, cmp, set, mtd)
#endif /* HAVE_5ARG_SGET */

#endif /* _ZFS_VFS_H */
Commit	Line	Data
7268e1be BB	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
bdf4328b BB	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 */
7268e1be	43
b3129792 PJ	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
5547c2f1	65	#if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER)
76659dc1	66	/*
5547c2f1 BB	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.
76659dc1	70	*/
5547c2f1 BB	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 */
76659dc1	96
28eb9213 DH	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
b39d3b9f BB	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
739a1a82 RY	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
3c203610 YS	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
7268e1be	144	#endif /* _ZFS_VFS_H */