[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.
 * Copyright (C) 2015 Jörg Thalheim.
 */

#ifndef _ZFS_VFS_H
#define	_ZFS_VFS_H

#include <sys/taskq.h>
#include <sys/cred.h>
#include <linux/backing-dev.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 */

/*
 * 2.6.32 - 2.6.33, bdi_setup_and_register() is not available.
 * 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
 * 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
 * 4.12 - x.y, super_setup_bdi_name() new interface.
 */
#if defined(HAVE_SUPER_SETUP_BDI_NAME)
extern atomic_long_t zfs_bdi_seq;

static inline int
zpl_bdi_setup(struct super_block *sb, char *name)
{
	return super_setup_bdi_name(sb, "%.28s-%ld", name,
	    atomic_long_inc_return(&zfs_bdi_seq));
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
}
#elif defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
static inline int
zpl_bdi_setup(struct super_block *sb, char *name)
{
	struct backing_dev_info *bdi;
	int error;

	bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
	error = bdi_setup_and_register(bdi, name);
	if (error) {
		kmem_free(bdi, sizeof (struct backing_dev_info));
		return (error);
	}

	sb->s_bdi = bdi;

	return (0);
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
	struct backing_dev_info *bdi = sb->s_bdi;

	bdi_destroy(bdi);
	kmem_free(bdi, sizeof (struct backing_dev_info));
	sb->s_bdi = NULL;
}
#elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
static inline int
zpl_bdi_setup(struct super_block *sb, char *name)
{
	struct backing_dev_info *bdi;
	int error;

	bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
	error = bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY);
	if (error) {
		kmem_free(sb->s_bdi, sizeof (struct backing_dev_info));
		return (error);
	}

	sb->s_bdi = bdi;

	return (0);
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
	struct backing_dev_info *bdi = sb->s_bdi;

	bdi_destroy(bdi);
	kmem_free(bdi, sizeof (struct backing_dev_info));
	sb->s_bdi = NULL;
}
#else
extern atomic_long_t zfs_bdi_seq;

static inline int
zpl_bdi_setup(struct super_block *sb, char *name)
{
	struct backing_dev_info *bdi;
	int error;

	bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
	bdi->name = name;
	bdi->capabilities = BDI_CAP_MAP_COPY;

	error = bdi_init(bdi);
	if (error) {
		kmem_free(bdi, sizeof (struct backing_dev_info));
		return (error);
	}

	error = bdi_register(bdi, NULL, "%.28s-%ld", name,
	    atomic_long_inc_return(&zfs_bdi_seq));
	if (error) {
		bdi_destroy(bdi);
		kmem_free(bdi, sizeof (struct backing_dev_info));
		return (error);
	}

	sb->s_bdi = bdi;

	return (0);
}
static inline void
zpl_bdi_destroy(struct super_block *sb)
{
	struct backing_dev_info *bdi = sb->s_bdi;

	bdi_destroy(bdi);
	kmem_free(bdi, sizeof (struct backing_dev_info));
	sb->s_bdi = NULL;
}
#endif

/*
 * 2.6.38 API change,
 * LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
 */
#ifndef LOOKUP_RCU
#define	LOOKUP_RCU	0x0
#endif /* LOOKUP_RCU */

/*
 * 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_MKDIR_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 */

#if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
static inline loff_t
lseek_execute(
	struct file *filp,
	struct inode *inode,
	loff_t offset,
	loff_t maxsize)
{
	if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
		return (-EINVAL);

	if (offset > maxsize)
		return (-EINVAL);

	if (offset != filp->f_pos) {
		spin_lock(&filp->f_lock);
		filp->f_pos = offset;
		filp->f_version = 0;
		spin_unlock(&filp->f_lock);
	}

	return (offset);
}
#endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */

#if defined(CONFIG_FS_POSIX_ACL)
/*
 * These functions safely approximates the behavior of posix_acl_release()
 * which cannot be used because it calls the GPL-only symbol kfree_rcu().
 * The in-kernel version, which can access the RCU, frees the ACLs after
 * the grace period expires.  Because we're unsure how long that grace
 * period may be this implementation conservatively delays for 60 seconds.
 * This is several orders of magnitude larger than expected grace period.
 * At 60 seconds the kernel will also begin issuing RCU stall warnings.
 */
#ifdef refcount_t
#undef refcount_t
#endif

#include <linux/posix_acl.h>

#if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
#define	zpl_posix_acl_release(arg)		posix_acl_release(arg)
#else
void zpl_posix_acl_release_impl(struct posix_acl *);

static inline void
zpl_posix_acl_release(struct posix_acl *acl)
{
	if ((acl == NULL) || (acl == ACL_NOT_CACHED))
		return;
#ifdef HAVE_ACL_REFCOUNT
	if (refcount_dec_and_test(&acl->a_refcount))
		zpl_posix_acl_release_impl(acl);
#else
	if (atomic_dec_and_test(&acl->a_refcount))
		zpl_posix_acl_release_impl(acl);
#endif
}
#endif /* HAVE_POSIX_ACL_RELEASE */

#ifdef HAVE_SET_CACHED_ACL_USABLE
#define	zpl_set_cached_acl(ip, ty, n)		set_cached_acl(ip, ty, n)
#define	zpl_forget_cached_acl(ip, ty)		forget_cached_acl(ip, ty)
#else
static inline void
zpl_set_cached_acl(struct inode *ip, int type, struct posix_acl *newer)
{
	struct posix_acl *older = NULL;

	spin_lock(&ip->i_lock);

	if ((newer != ACL_NOT_CACHED) && (newer != NULL))
		posix_acl_dup(newer);

	switch (type) {
	case ACL_TYPE_ACCESS:
		older = ip->i_acl;
		rcu_assign_pointer(ip->i_acl, newer);
		break;
	case ACL_TYPE_DEFAULT:
		older = ip->i_default_acl;
		rcu_assign_pointer(ip->i_default_acl, newer);
		break;
	}

	spin_unlock(&ip->i_lock);

	zpl_posix_acl_release(older);
}

static inline void
zpl_forget_cached_acl(struct inode *ip, int type)
{
	zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED);
}
#endif /* HAVE_SET_CACHED_ACL_USABLE */

#ifndef HAVE___POSIX_ACL_CHMOD
#ifdef HAVE_POSIX_ACL_CHMOD
#define	__posix_acl_chmod(acl, gfp, mode)	posix_acl_chmod(acl, gfp, mode)
#define	__posix_acl_create(acl, gfp, mode)	posix_acl_create(acl, gfp, mode)
#else
static inline int
__posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode)
{
	struct posix_acl *oldacl = *acl;
	mode_t mode = umode;
	int error;

	*acl = posix_acl_clone(*acl, flags);
	zpl_posix_acl_release(oldacl);

	if (!(*acl))
		return (-ENOMEM);

	error = posix_acl_chmod_masq(*acl, mode);
	if (error) {
		zpl_posix_acl_release(*acl);
		*acl = NULL;
	}

	return (error);
}

static inline int
__posix_acl_create(struct posix_acl **acl, int flags, umode_t *umodep)
{
	struct posix_acl *oldacl = *acl;
	mode_t mode = *umodep;
	int error;

	*acl = posix_acl_clone(*acl, flags);
	zpl_posix_acl_release(oldacl);

	if (!(*acl))
		return (-ENOMEM);

	error = posix_acl_create_masq(*acl, &mode);
	*umodep = mode;

	if (error < 0) {
		zpl_posix_acl_release(*acl);
		*acl = NULL;
	}

	return (error);
}
#endif /* HAVE_POSIX_ACL_CHMOD */
#endif /* HAVE___POSIX_ACL_CHMOD */

#ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T
typedef umode_t zpl_equivmode_t;
#else
typedef mode_t zpl_equivmode_t;
#endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */

/*
 * 4.8 API change,
 * posix_acl_valid() now must be passed a namespace, the namespace from
 * from super block associated with the given inode is used for this purpose.
 */
#ifdef HAVE_POSIX_ACL_VALID_WITH_NS
#define	zpl_posix_acl_valid(ip, acl)  posix_acl_valid(ip->i_sb->s_user_ns, acl)
#else
#define	zpl_posix_acl_valid(ip, acl)  posix_acl_valid(acl)
#endif

#define	refcount_t	zfs_refcount_t

#endif /* CONFIG_FS_POSIX_ACL */

/*
 * 2.6.38 API change,
 * The is_owner_or_cap() function was renamed to inode_owner_or_capable().
 */
#ifdef HAVE_INODE_OWNER_OR_CAPABLE
#define	zpl_inode_owner_or_capable(ip)		inode_owner_or_capable(ip)
#else
#define	zpl_inode_owner_or_capable(ip)		is_owner_or_cap(ip)
#endif /* HAVE_INODE_OWNER_OR_CAPABLE */

/*
 * 3.19 API change
 * struct access f->f_dentry->d_inode was replaced by accessor function
 * file_inode(f)
 */
#ifndef HAVE_FILE_INODE
static inline struct inode *file_inode(const struct file *f)
{
	return (f->f_dentry->d_inode);
}
#endif /* HAVE_FILE_INODE */

/*
 * 4.1 API change
 * struct access file->f_path.dentry was replaced by accessor function
 * file_dentry(f)
 */
#ifndef HAVE_FILE_DENTRY
static inline struct dentry *file_dentry(const struct file *f)
{
	return (f->f_path.dentry);
}
#endif /* HAVE_FILE_DENTRY */

#ifdef HAVE_KUID_HELPERS
static inline uid_t zfs_uid_read_impl(struct inode *ip)
{
#ifdef HAVE_SUPER_USER_NS
	return (from_kuid(ip->i_sb->s_user_ns, ip->i_uid));
#else
	return (from_kuid(kcred->user_ns, ip->i_uid));
#endif
}

static inline uid_t zfs_uid_read(struct inode *ip)
{
	return (zfs_uid_read_impl(ip));
}

static inline gid_t zfs_gid_read_impl(struct inode *ip)
{
#ifdef HAVE_SUPER_USER_NS
	return (from_kgid(ip->i_sb->s_user_ns, ip->i_gid));
#else
	return (from_kgid(kcred->user_ns, ip->i_gid));
#endif
}

static inline gid_t zfs_gid_read(struct inode *ip)
{
	return (zfs_gid_read_impl(ip));
}

static inline void zfs_uid_write(struct inode *ip, uid_t uid)
{
#ifdef HAVE_SUPER_USER_NS
	ip->i_uid = make_kuid(ip->i_sb->s_user_ns, uid);
#else
	ip->i_uid = make_kuid(kcred->user_ns, uid);
#endif
}

static inline void zfs_gid_write(struct inode *ip, gid_t gid)
{
#ifdef HAVE_SUPER_USER_NS
	ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid);
#else
	ip->i_gid = make_kgid(kcred->user_ns, gid);
#endif
}

#else
static inline uid_t zfs_uid_read(struct inode *ip)
{
	return (ip->i_uid);
}

static inline gid_t zfs_gid_read(struct inode *ip)
{
	return (ip->i_gid);
}

static inline void zfs_uid_write(struct inode *ip, uid_t uid)
{
	ip->i_uid = uid;
}

static inline void zfs_gid_write(struct inode *ip, gid_t gid)
{
	ip->i_gid = gid;
}
#endif

/*
 * 2.6.38 API change
 */
#ifdef HAVE_FOLLOW_DOWN_ONE
#define	zpl_follow_down_one(path)		follow_down_one(path)
#define	zpl_follow_up(path)			follow_up(path)
#else
#define	zpl_follow_down_one(path)		follow_down(path)
#define	zpl_follow_up(path)			follow_up(path)
#endif

/*
 * 4.9 API change
 */
#ifndef HAVE_SETATTR_PREPARE
static inline int
setattr_prepare(struct dentry *dentry, struct iattr *ia)
{
	return (inode_change_ok(dentry->d_inode, ia));
}
#endif

/*
 * 4.11 API change
 * These macros are defined by kernel 4.11.  We define them so that the same
 * code builds under kernels < 4.11 and >= 4.11.  The macros are set to 0 so
 * that it will create obvious failures if they are accidentally used when built
 * against a kernel >= 4.11.
 */

#ifndef STATX_BASIC_STATS
#define	STATX_BASIC_STATS	0
#endif

#ifndef AT_STATX_SYNC_AS_STAT
#define	AT_STATX_SYNC_AS_STAT	0
#endif

/*
 * 4.11 API change
 * 4.11 takes struct path *, < 4.11 takes vfsmount *
 */

#ifdef HAVE_VFSMOUNT_IOPS_GETATTR
#define	ZPL_GETATTR_WRAPPER(func)					\
static int								\
func(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)	\
{									\
	struct path path = { .mnt = mnt, .dentry = dentry };		\
	return func##_impl(&path, stat, STATX_BASIC_STATS,		\
	    AT_STATX_SYNC_AS_STAT);					\
}
#elif defined(HAVE_PATH_IOPS_GETATTR)
#define	ZPL_GETATTR_WRAPPER(func)					\
static int								\
func(const struct path *path, struct kstat *stat, u32 request_mask,	\
    unsigned int query_flags)						\
{									\
	return (func##_impl(path, stat, request_mask, query_flags));	\
}
#else
#error
#endif

/*
 * 4.9 API change
 * Preferred interface to get the current FS time.
 */
#if !defined(HAVE_CURRENT_TIME)
static inline struct timespec
current_time(struct inode *ip)
{
	return (timespec_trunc(current_kernel_time(), ip->i_sb->s_time_gran));
}
#endif

/*
 * 4.16 API change
 * Added iversion interface for managing inode version field.
 */
#ifdef HAVE_INODE_SET_IVERSION
#include <linux/iversion.h>
#else
static inline void
inode_set_iversion(struct inode *ip, u64 val)
{
	ip->i_version = val;
}
#endif

#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.
534759fa	24	* Copyright (C) 2015 Jörg Thalheim.
7268e1be BB	25	*/
	26
	27	#ifndef _ZFS_VFS_H
d1d7e268	28	#define _ZFS_VFS_H
7268e1be	29
194e5623	30	#include <sys/taskq.h>
82a1b2d6	31	#include <sys/cred.h>
e80da864	32	#include <linux/backing-dev.h>
194e5623	33
bdf4328b BB	34	/*
	35	* 2.6.28 API change,
	36	* Added insert_inode_locked() helper function, prior to this most callers
	37	* used insert_inode_hash(). The older method doesn't check for collisions
	38	* in the inode_hashtable but it still acceptible for use.
	39	*/
	40	#ifndef HAVE_INSERT_INODE_LOCKED
	41	static inline int
	42	insert_inode_locked(struct inode *ip)
	43	{
	44	insert_inode_hash(ip);
	45	return (0);
	46	}
	47	#endif /* HAVE_INSERT_INODE_LOCKED */
7268e1be	48
b3129792 PJ	49	/*
	50	* 2.6.35 API change,
	51	* Add truncate_setsize() if it is not exported by the Linux kernel.
	52	*
	53	* Truncate the inode and pages associated with the inode. The pages are
	54	* unmapped and removed from cache.
	55	*/
	56	#ifndef HAVE_TRUNCATE_SETSIZE
	57	static inline void
	58	truncate_setsize(struct inode *ip, loff_t new)
	59	{
	60	struct address_space *mapping = ip->i_mapping;
	61
	62	i_size_write(ip, new);
	63
	64	unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
	65	truncate_inode_pages(mapping, new);
	66	unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
	67	}
	68	#endif /* HAVE_TRUNCATE_SETSIZE */
	69
76659dc1	70	/*
8c45def2 BB	71	* 2.6.32 - 2.6.33, bdi_setup_and_register() is not available.
8c45def2 BB	72	* 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
7dae2c81 BB	73	* 4.0 - 4.11, bdi_setup_and_register() takes 2 arguments.
7dae2c81 BB	74	* 4.12 - x.y, super_setup_bdi_name() new interface.
76659dc1	75	*/
7dae2c81	76	#if defined(HAVE_SUPER_SETUP_BDI_NAME)
3e6c9433	77	extern atomic_long_t zfs_bdi_seq;
3e6c9433	78
8c45def2	79	static inline int
7dae2c81	80	zpl_bdi_setup(struct super_block sb, char name)
8c45def2	81	{
3e6c9433	82	return super_setup_bdi_name(sb, "%.28s-%ld", name,
3e6c9433	83	atomic_long_inc_return(&zfs_bdi_seq));
7dae2c81 BB	84	}
	85	static inline void
	86	zpl_bdi_destroy(struct super_block *sb)
	87	{
	88	}
	89	#elif defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER)
	90	static inline int
	91	zpl_bdi_setup(struct super_block sb, char name)
	92	{
	93	struct backing_dev_info *bdi;
	94	int error;
	95
	96	bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
	97	error = bdi_setup_and_register(bdi, name);
	98	if (error) {
	99	kmem_free(bdi, sizeof (struct backing_dev_info));
	100	return (error);
	101	}
	102
	103	sb->s_bdi = bdi;
	104
	105	return (0);
	106	}
	107	static inline void
	108	zpl_bdi_destroy(struct super_block *sb)
	109	{
	110	struct backing_dev_info *bdi = sb->s_bdi;
	111
	112	bdi_destroy(bdi);
	113	kmem_free(bdi, sizeof (struct backing_dev_info));
	114	sb->s_bdi = NULL;
8c45def2 BB	115	}
	116	#elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER)
	117	static inline int
7dae2c81 BB	118	zpl_bdi_setup(struct super_block sb, char name)
	119	{
	120	struct backing_dev_info *bdi;
	121	int error;
	122
	123	bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
	124	error = bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY);
	125	if (error) {
	126	kmem_free(sb->s_bdi, sizeof (struct backing_dev_info));
	127	return (error);
	128	}
	129
	130	sb->s_bdi = bdi;
	131
	132	return (0);
	133	}
	134	static inline void
	135	zpl_bdi_destroy(struct super_block *sb)
8c45def2	136	{
7dae2c81 BB	137	struct backing_dev_info *bdi = sb->s_bdi;
	138
	139	bdi_destroy(bdi);
	140	kmem_free(bdi, sizeof (struct backing_dev_info));
	141	sb->s_bdi = NULL;
8c45def2 BB	142	}
8c45def2 BB	143	#else
5547c2f1 BB	144	extern atomic_long_t zfs_bdi_seq;
	145
	146	static inline int
7dae2c81	147	zpl_bdi_setup(struct super_block sb, char name)
5547c2f1	148	{
7dae2c81	149	struct backing_dev_info *bdi;
5547c2f1 BB	150	int error;
5547c2f1 BB	151
7dae2c81	152	bdi = kmem_zalloc(sizeof (struct backing_dev_info), KM_SLEEP);
5547c2f1	153	bdi->name = name;
8c45def2 BB	154	bdi->capabilities = BDI_CAP_MAP_COPY;
8c45def2 BB	155
5547c2f1	156	error = bdi_init(bdi);
7dae2c81 BB	157	if (error) {
7dae2c81 BB	158	kmem_free(bdi, sizeof (struct backing_dev_info));
5547c2f1	159	return (error);
7dae2c81	160	}
5547c2f1	161
3e6c9433	162	error = bdi_register(bdi, NULL, "%.28s-%ld", name,
5547c2f1 BB	163	atomic_long_inc_return(&zfs_bdi_seq));
	164	if (error) {
	165	bdi_destroy(bdi);
7dae2c81	166	kmem_free(bdi, sizeof (struct backing_dev_info));
5547c2f1 BB	167	return (error);
	168	}
	169
7dae2c81 BB	170	sb->s_bdi = bdi;
	171
	172	return (0);
	173	}
	174	static inline void
	175	zpl_bdi_destroy(struct super_block *sb)
	176	{
	177	struct backing_dev_info *bdi = sb->s_bdi;
	178
	179	bdi_destroy(bdi);
	180	kmem_free(bdi, sizeof (struct backing_dev_info));
	181	sb->s_bdi = NULL;
5547c2f1	182	}
8c45def2	183	#endif
76659dc1	184
7b3e34ba BB	185	/*
	186	* 2.6.38 API change,
	187	* LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases.
	188	*/
	189	#ifndef LOOKUP_RCU
d1d7e268	190	#define LOOKUP_RCU 0x0
7b3e34ba BB	191	#endif /* LOOKUP_RCU */
7b3e34ba BB	192
28eb9213 DH	193	/*
	194	* 3.2-rc1 API change,
	195	* Add set_nlink() if it is not exported by the Linux kernel.
	196	*
	197	* i_nlink is read-only in Linux 3.2, but it can be set directly in
	198	* earlier kernels.
	199	*/
	200	#ifndef HAVE_SET_NLINK
	201	static inline void
	202	set_nlink(struct inode *inode, unsigned int nlink)
	203	{
	204	inode->i_nlink = nlink;
	205	}
	206	#endif /* HAVE_SET_NLINK */
	207
b39d3b9f BB	208	/*
	209	* 3.3 API change,
	210	* The VFS .create, .mkdir and .mknod callbacks were updated to take a
	211	* umode_t type rather than an int. To cleanly handle both definitions
	212	* the zpl_umode_t type is introduced and set accordingly.
	213	*/
95f5c63b	214	#ifdef HAVE_MKDIR_UMODE_T
b39d3b9f BB	215	typedef umode_t zpl_umode_t;
	216	#else
	217	typedef int zpl_umode_t;
	218	#endif
	219
739a1a82 RY	220	/*
	221	* 3.5 API change,
	222	* The clear_inode() function replaces end_writeback() and introduces an
	223	* ordering change regarding when the inode_sync_wait() occurs. See the
	224	* configure check in config/kernel-clear-inode.m4 for full details.
	225	*/
	226	#if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE)
d1d7e268	227	#define clear_inode(ip) end_writeback(ip)
739a1a82 RY	228	#endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */
739a1a82 RY	229
3c203610 YS	230	/*
	231	* 3.6 API change,
	232	* The sget() helper function now takes the mount flags as an argument.
	233	*/
	234	#ifdef HAVE_5ARG_SGET
d1d7e268	235	#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, fl, mtd)
3c203610	236	#else
d1d7e268	237	#define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, mtd)
3c203610 YS	238	#endif /* HAVE_5ARG_SGET */
3c203610 YS	239
802e7b5f LD	240	#if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE)
802e7b5f LD	241	static inline loff_t
d1d7e268 MK	242	lseek_execute(
	243	struct file *filp,
	244	struct inode *inode,
	245	loff_t offset,
	246	loff_t maxsize)
802e7b5f LD	247	{
	248	if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET))
	249	return (-EINVAL);
	250
	251	if (offset > maxsize)
	252	return (-EINVAL);
	253
	254	if (offset != filp->f_pos) {
	255	spin_lock(&filp->f_lock);
	256	filp->f_pos = offset;
	257	filp->f_version = 0;
	258	spin_unlock(&filp->f_lock);
	259	}
	260
	261	return (offset);
	262	}
	263	#endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */
	264
b695c34e	265	#if defined(CONFIG_FS_POSIX_ACL)
023699cd MM	266	/*
	267	* These functions safely approximates the behavior of posix_acl_release()
	268	* which cannot be used because it calls the GPL-only symbol kfree_rcu().
	269	* The in-kernel version, which can access the RCU, frees the ACLs after
	270	* the grace period expires. Because we're unsure how long that grace
	271	* period may be this implementation conservatively delays for 60 seconds.
	272	* This is several orders of magnitude larger than expected grace period.
	273	* At 60 seconds the kernel will also begin issuing RCU stall warnings.
	274	*/
3713b733 BB	275	#ifdef refcount_t
	276	#undef refcount_t
	277	#endif
	278
023699cd	279	#include <linux/posix_acl.h>
023699cd MM	280
023699cd MM	281	#if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
023699cd	282	#define zpl_posix_acl_release(arg) posix_acl_release(arg)
023699cd	283	#else
8e71ab99	284	void zpl_posix_acl_release_impl(struct posix_acl *);
023699cd MM	285
	286	static inline void
	287	zpl_posix_acl_release(struct posix_acl *acl)
	288	{
	289	if ((acl == NULL) \|\| (acl == ACL_NOT_CACHED))
	290	return;
e5ba614d TH	291	#ifdef HAVE_ACL_REFCOUNT
	292	if (refcount_dec_and_test(&acl->a_refcount))
	293	zpl_posix_acl_release_impl(acl);
	294	#else
8e71ab99 CC	295	if (atomic_dec_and_test(&acl->a_refcount))
8e71ab99 CC	296	zpl_posix_acl_release_impl(acl);
e5ba614d	297	#endif
023699cd	298	}
3779913b	299	#endif /* HAVE_POSIX_ACL_RELEASE */
023699cd	300
3779913b CC	301	#ifdef HAVE_SET_CACHED_ACL_USABLE
	302	#define zpl_set_cached_acl(ip, ty, n) set_cached_acl(ip, ty, n)
	303	#define zpl_forget_cached_acl(ip, ty) forget_cached_acl(ip, ty)
	304	#else
023699cd	305	static inline void
4ea3f864 GM	306	zpl_set_cached_acl(struct inode ip, int type, struct posix_acl newer)
4ea3f864 GM	307	{
023699cd MM	308	struct posix_acl *older = NULL;
	309
	310	spin_lock(&ip->i_lock);
	311
	312	if ((newer != ACL_NOT_CACHED) && (newer != NULL))
	313	posix_acl_dup(newer);
	314
d1d7e268	315	switch (type) {
023699cd MM	316	case ACL_TYPE_ACCESS:
023699cd MM	317	older = ip->i_acl;
d1d7e268	318	rcu_assign_pointer(ip->i_acl, newer);
023699cd MM	319	break;
	320	case ACL_TYPE_DEFAULT:
	321	older = ip->i_default_acl;
d1d7e268	322	rcu_assign_pointer(ip->i_default_acl, newer);
023699cd MM	323	break;
	324	}
	325
	326	spin_unlock(&ip->i_lock);
	327
	328	zpl_posix_acl_release(older);
023699cd MM	329	}
	330
	331	static inline void
4ea3f864 GM	332	zpl_forget_cached_acl(struct inode *ip, int type)
4ea3f864 GM	333	{
023699cd MM	334	zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED);
023699cd MM	335	}
3779913b	336	#endif /* HAVE_SET_CACHED_ACL_USABLE */
023699cd	337
408ec0d2 CC	338	#ifndef HAVE___POSIX_ACL_CHMOD
	339	#ifdef HAVE_POSIX_ACL_CHMOD
	340	#define __posix_acl_chmod(acl, gfp, mode) posix_acl_chmod(acl, gfp, mode)
	341	#define __posix_acl_create(acl, gfp, mode) posix_acl_create(acl, gfp, mode)
	342	#else
023699cd	343	static inline int
4ea3f864 GM	344	__posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode)
4ea3f864 GM	345	{
023699cd MM	346	struct posix_acl oldacl = acl;
	347	mode_t mode = umode;
	348	int error;
	349
	350	acl = posix_acl_clone(acl, flags);
	351	zpl_posix_acl_release(oldacl);
	352
	353	if (!(*acl))
	354	return (-ENOMEM);
	355
	356	error = posix_acl_chmod_masq(*acl, mode);
	357	if (error) {
	358	zpl_posix_acl_release(*acl);
	359	*acl = NULL;
	360	}
	361
d1d7e268	362	return (error);
023699cd MM	363	}
	364
	365	static inline int
4ea3f864 GM	366	__posix_acl_create(struct posix_acl *acl, int flags, umode_t umodep)
4ea3f864 GM	367	{
023699cd MM	368	struct posix_acl oldacl = acl;
	369	mode_t mode = *umodep;
	370	int error;
	371
	372	acl = posix_acl_clone(acl, flags);
	373	zpl_posix_acl_release(oldacl);
	374
	375	if (!(*acl))
	376	return (-ENOMEM);
	377
	378	error = posix_acl_create_masq(*acl, &mode);
	379	*umodep = mode;
	380
	381	if (error < 0) {
	382	zpl_posix_acl_release(*acl);
	383	*acl = NULL;
	384	}
	385
	386	return (error);
	387	}
	388	#endif /* HAVE_POSIX_ACL_CHMOD */
408ec0d2	389	#endif /* HAVE___POSIX_ACL_CHMOD */
023699cd	390
62a05896 CW	391	#ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T
	392	typedef umode_t zpl_equivmode_t;
	393	#else
	394	typedef mode_t zpl_equivmode_t;
	395	#endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */
4b908d32 BB	396
	397	/*
	398	* 4.8 API change,
	399	* posix_acl_valid() now must be passed a namespace, the namespace from
	400	* from super block associated with the given inode is used for this purpose.
	401	*/
	402	#ifdef HAVE_POSIX_ACL_VALID_WITH_NS
	403	#define zpl_posix_acl_valid(ip, acl) posix_acl_valid(ip->i_sb->s_user_ns, acl)
	404	#else
	405	#define zpl_posix_acl_valid(ip, acl) posix_acl_valid(acl)
	406	#endif
	407
3713b733 BB	408	#define refcount_t zfs_refcount_t
3713b733 BB	409
62a05896 CW	410	#endif /* CONFIG_FS_POSIX_ACL */
62a05896 CW	411
62a05896 CW	412	/*
	413	* 2.6.38 API change,
	414	* The is_owner_or_cap() function was renamed to inode_owner_or_capable().
	415	*/
	416	#ifdef HAVE_INODE_OWNER_OR_CAPABLE
	417	#define zpl_inode_owner_or_capable(ip) inode_owner_or_capable(ip)
023699cd	418	#else
62a05896 CW	419	#define zpl_inode_owner_or_capable(ip) is_owner_or_cap(ip)
62a05896 CW	420	#endif /* HAVE_INODE_OWNER_OR_CAPABLE */
023699cd	421
534759fa JT	422	/*
	423	* 3.19 API change
	424	* struct access f->f_dentry->d_inode was replaced by accessor function
	425	* file_inode(f)
	426	*/
	427	#ifndef HAVE_FILE_INODE
	428	static inline struct inode file_inode(const struct file f)
	429	{
	430	return (f->f_dentry->d_inode);
	431	}
	432	#endif /* HAVE_FILE_INODE */
	433
d9c97ec0 CH	434	/*
	435	* 4.1 API change
	436	* struct access file->f_path.dentry was replaced by accessor function
	437	* file_dentry(f)
	438	*/
	439	#ifndef HAVE_FILE_DENTRY
	440	static inline struct dentry file_dentry(const struct file f)
	441	{
	442	return (f->f_path.dentry);
	443	}
	444	#endif /* HAVE_FILE_DENTRY */
	445
82a1b2d6 NB	446	#ifdef HAVE_KUID_HELPERS
	447	static inline uid_t zfs_uid_read_impl(struct inode *ip)
	448	{
938cfeb0 NB	449	#ifdef HAVE_SUPER_USER_NS
	450	return (from_kuid(ip->i_sb->s_user_ns, ip->i_uid));
	451	#else
82a1b2d6	452	return (from_kuid(kcred->user_ns, ip->i_uid));
938cfeb0	453	#endif
82a1b2d6 NB	454	}
	455
	456	static inline uid_t zfs_uid_read(struct inode *ip)
	457	{
	458	return (zfs_uid_read_impl(ip));
	459	}
	460
	461	static inline gid_t zfs_gid_read_impl(struct inode *ip)
	462	{
938cfeb0 NB	463	#ifdef HAVE_SUPER_USER_NS
	464	return (from_kgid(ip->i_sb->s_user_ns, ip->i_gid));
	465	#else
82a1b2d6	466	return (from_kgid(kcred->user_ns, ip->i_gid));
938cfeb0	467	#endif
82a1b2d6 NB	468	}
	469
	470	static inline gid_t zfs_gid_read(struct inode *ip)
	471	{
	472	return (zfs_gid_read_impl(ip));
	473	}
	474
	475	static inline void zfs_uid_write(struct inode *ip, uid_t uid)
	476	{
938cfeb0 NB	477	#ifdef HAVE_SUPER_USER_NS
	478	ip->i_uid = make_kuid(ip->i_sb->s_user_ns, uid);
	479	#else
82a1b2d6	480	ip->i_uid = make_kuid(kcred->user_ns, uid);
938cfeb0	481	#endif
82a1b2d6 NB	482	}
	483
	484	static inline void zfs_gid_write(struct inode *ip, gid_t gid)
	485	{
938cfeb0 NB	486	#ifdef HAVE_SUPER_USER_NS
	487	ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid);
	488	#else
82a1b2d6	489	ip->i_gid = make_kgid(kcred->user_ns, gid);
938cfeb0	490	#endif
82a1b2d6	491	}
938cfeb0	492
82a1b2d6 NB	493	#else
	494	static inline uid_t zfs_uid_read(struct inode *ip)
	495	{
	496	return (ip->i_uid);
	497	}
	498
	499	static inline gid_t zfs_gid_read(struct inode *ip)
	500	{
	501	return (ip->i_gid);
	502	}
	503
	504	static inline void zfs_uid_write(struct inode *ip, uid_t uid)
	505	{
	506	ip->i_uid = uid;
	507	}
	508
	509	static inline void zfs_gid_write(struct inode *ip, gid_t gid)
	510	{
	511	ip->i_gid = gid;
	512	}
	513	#endif
	514
278bee93 BB	515	/*
	516	* 2.6.38 API change
	517	*/
	518	#ifdef HAVE_FOLLOW_DOWN_ONE
	519	#define zpl_follow_down_one(path) follow_down_one(path)
	520	#define zpl_follow_up(path) follow_up(path)
	521	#else
	522	#define zpl_follow_down_one(path) follow_down(path)
	523	#define zpl_follow_up(path) follow_up(path)
	524	#endif
	525
3b0ba3ba BB	526	/*
	527	* 4.9 API change
	528	*/
	529	#ifndef HAVE_SETATTR_PREPARE
	530	static inline int
	531	setattr_prepare(struct dentry dentry, struct iattr ia)
	532	{
	533	return (inode_change_ok(dentry->d_inode, ia));
	534	}
	535	#endif
	536
a3478c07 OF	537	/*
	538	* 4.11 API change
	539	* These macros are defined by kernel 4.11. We define them so that the same
	540	* code builds under kernels < 4.11 and >= 4.11. The macros are set to 0 so
	541	* that it will create obvious failures if they are accidentally used when built
	542	* against a kernel >= 4.11.
	543	*/
	544
	545	#ifndef STATX_BASIC_STATS
	546	#define STATX_BASIC_STATS 0
	547	#endif
	548
	549	#ifndef AT_STATX_SYNC_AS_STAT
	550	#define AT_STATX_SYNC_AS_STAT 0
	551	#endif
	552
	553	/*
	554	* 4.11 API change
	555	* 4.11 takes struct path , < 4.11 takes vfsmount
	556	*/
	557
	558	#ifdef HAVE_VFSMOUNT_IOPS_GETATTR
	559	#define ZPL_GETATTR_WRAPPER(func) \
	560	static int \
	561	func(struct vfsmount mnt, struct dentry dentry, struct kstat *stat) \
	562	{ \
	563	struct path path = { .mnt = mnt, .dentry = dentry }; \
	564	return func##_impl(&path, stat, STATX_BASIC_STATS, \
	565	AT_STATX_SYNC_AS_STAT); \
	566	}
	567	#elif defined(HAVE_PATH_IOPS_GETATTR)
	568	#define ZPL_GETATTR_WRAPPER(func) \
	569	static int \
	570	func(const struct path path, struct kstat stat, u32 request_mask, \
	571	unsigned int query_flags) \
	572	{ \
	573	return (func##_impl(path, stat, request_mask, query_flags)); \
	574	}
	575	#else
	576	#error
	577	#endif
	578
2946a1a1 BB	579	/*
	580	* 4.9 API change
	581	* Preferred interface to get the current FS time.
	582	*/
	583	#if !defined(HAVE_CURRENT_TIME)
	584	static inline struct timespec
	585	current_time(struct inode *ip)
	586	{
	587	return (timespec_trunc(current_kernel_time(), ip->i_sb->s_time_gran));
	588	}
	589	#endif
a3478c07	590
310e63df BB	591	/*
	592	* 4.16 API change
	593	* Added iversion interface for managing inode version field.
	594	*/
	595	#ifdef HAVE_INODE_SET_IVERSION
	596	#include <linux/iversion.h>
	597	#else
	598	static inline void
	599	inode_set_iversion(struct inode *ip, u64 val)
	600	{
	601	ip->i_version = val;
	602	}
	603	#endif
	604
7268e1be	605	#endif /* _ZFS_VFS_H */