/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2013, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/include/md_object.h
 *
 * Extention of lu_object.h for metadata objects
 */

#ifndef _LUSTRE_MD_OBJECT_H
#define _LUSTRE_MD_OBJECT_H

/** \defgroup md md
 * Sub-class of lu_object with methods common for "meta-data" objects in MDT
 * stack.
 *
 * Meta-data objects implement namespace operations: you can link, unlink
 * them, and treat them as directories.
 *
 * Examples: mdt, cmm, and mdt are implementations of md interface.
 * @{
 */


/*
 * super-class definitions.
 */
#include <dt_object.h>

struct md_device;
struct md_device_operations;
struct md_object;
struct obd_export;

enum {
        UCRED_INVALID   = -1,
        UCRED_INIT      = 0,
        UCRED_OLD       = 1,
        UCRED_NEW       = 2
};

enum {
        MD_CAPAINFO_MAX = 5
};

/** there are at most 5 fids in one operation, see rename, NOTE the last one
 * is a temporary one used for is_subdir() */
struct md_capainfo {
        __u32                   mc_auth;
        __u32                   mc_padding;
        struct lu_fid           mc_fid[MD_CAPAINFO_MAX];
        struct lustre_capa     *mc_capa[MD_CAPAINFO_MAX];
};

struct md_quota {
        struct obd_export       *mq_exp;
};

/**
 * Implemented in mdd/mdd_handler.c.
 *
 * XXX should be moved into separate .h/.c together with all md security
 * related definitions.
 */
struct md_capainfo *md_capainfo(const struct lu_env *env);
struct md_quota *md_quota(const struct lu_env *env);

/** metadata attributes */
enum ma_valid {
        MA_INODE     = (1 << 0),
        MA_LOV       = (1 << 1),
        MA_COOKIE    = (1 << 2),
        MA_FLAGS     = (1 << 3),
        MA_LMV       = (1 << 4),
        MA_ACL_DEF   = (1 << 5),
        MA_LOV_DEF   = (1 << 6),
        MA_LAY_GEN   = (1 << 7),
        MA_HSM       = (1 << 8),
        MA_SOM       = (1 << 9),
        MA_PFID      = (1 << 10)
};

typedef enum {
        MDL_MINMODE  = 0,
        MDL_EX       = 1,
        MDL_PW       = 2,
        MDL_PR       = 4,
        MDL_CW       = 8,
        MDL_CR       = 16,
        MDL_NL       = 32,
        MDL_GROUP    = 64,
        MDL_MAXMODE
} mdl_mode_t;

typedef enum {
        MDT_NUL_LOCK = 0,
        MDT_REG_LOCK = (1 << 0),
        MDT_PDO_LOCK = (1 << 1)
} mdl_type_t;

/* memory structure for hsm attributes
 * for fields description see the on disk structure hsm_attrs
 * which is defined in lustre_idl.h
 */
struct md_hsm {
	__u32	mh_compat;
	__u32	mh_flags;
	__u64	mh_arch_id;
	__u64	mh_arch_ver;
};

#define IOEPOCH_INVAL 0

/* memory structure for som attributes
 * for fields description see the on disk structure som_attrs
 * which is defined in lustre_idl.h
 */
struct md_som_data {
	__u32	msd_compat;
	__u32	msd_incompat;
	__u64	msd_ioepoch;
	__u64	msd_size;
	__u64	msd_blocks;
	__u64	msd_mountid;
};

struct md_attr {
        __u64                   ma_valid;
        __u64                   ma_need;
        __u64                   ma_attr_flags;
        struct lu_attr          ma_attr;
        struct lu_fid           ma_pfid;
        struct md_hsm           ma_hsm;
        struct lov_mds_md      *ma_lmm;
        struct lmv_stripe_md   *ma_lmv;
        void                   *ma_acl;
        struct llog_cookie     *ma_cookie;
        struct lustre_capa     *ma_capa;
        struct md_som_data     *ma_som;
        int                     ma_lmm_size;
        int                     ma_lmv_size;
        int                     ma_acl_size;
        int                     ma_cookie_size;
        __u16                   ma_layout_gen;
};

/** Additional parameters for create */
struct md_op_spec {
        union {
                /** symlink target */
                const char               *sp_symname;
                /** parent FID for cross-ref mkdir */
                const struct lu_fid      *sp_pfid;
                /** eadata for regular files */
                struct md_spec_reg {
                        /** lov objs exist already */
                        const struct lu_fid   *fid;
                        const void *eadata;
                        int  eadatalen;
                } sp_ea;
        } u;

        /** Create flag from client: such as MDS_OPEN_CREAT, and others. */
        __u64      sp_cr_flags;

	/** don't create lov objects or llog cookie - this replay */
	unsigned int no_create:1,
		     sp_cr_lookup:1, /* do lookup sanity check or not. */
		     sp_rm_entry:1;  /* only remove name entry */

	/** Current lock mode for parent dir where create is performing. */
        mdl_mode_t sp_cr_mode;

        /** to create directory */
        const struct dt_index_features *sp_feat;
};

/**
 * Operations implemented for each md object (both directory and leaf).
 */
struct md_object_operations {
        int (*moo_permission)(const struct lu_env *env,
                              struct md_object *pobj, struct md_object *cobj,
                              struct md_attr *attr, int mask);

        int (*moo_attr_get)(const struct lu_env *env, struct md_object *obj,
                            struct md_attr *attr);

        int (*moo_attr_set)(const struct lu_env *env, struct md_object *obj,
                            const struct md_attr *attr);

        int (*moo_xattr_get)(const struct lu_env *env, struct md_object *obj,
                             struct lu_buf *buf, const char *name);

        int (*moo_xattr_list)(const struct lu_env *env, struct md_object *obj,
                              struct lu_buf *buf);

        int (*moo_xattr_set)(const struct lu_env *env, struct md_object *obj,
                             const struct lu_buf *buf, const char *name,
                             int fl);

        int (*moo_xattr_del)(const struct lu_env *env, struct md_object *obj,
                             const char *name);

	/** This method is used to swap the layouts between 2 objects */
	int (*moo_swap_layouts)(const struct lu_env *env,
			       struct md_object *obj1, struct md_object *obj2,
			       __u64 flags);

        /** \retval number of bytes actually read upon success */
        int (*moo_readpage)(const struct lu_env *env, struct md_object *obj,
                            const struct lu_rdpg *rdpg);

        int (*moo_readlink)(const struct lu_env *env, struct md_object *obj,
                            struct lu_buf *buf);
        int (*moo_changelog)(const struct lu_env *env,
                             enum changelog_rec_type type, int flags,
                             struct md_object *obj);
        /** part of cross-ref operation */
        int (*moo_object_create)(const struct lu_env *env,
                                 struct md_object *obj,
                                 const struct md_op_spec *spec,
                                 struct md_attr *ma);

        int (*moo_ref_add)(const struct lu_env *env,
                           struct md_object *obj,
                           const struct md_attr *ma);

        int (*moo_ref_del)(const struct lu_env *env,
                           struct md_object *obj,
                           struct md_attr *ma);

        int (*moo_open)(const struct lu_env *env,
                        struct md_object *obj, int flag);

        int (*moo_close)(const struct lu_env *env, struct md_object *obj,
                         struct md_attr *ma, int mode);

        int (*moo_capa_get)(const struct lu_env *, struct md_object *,
                            struct lustre_capa *, int renewal);

        int (*moo_object_sync)(const struct lu_env *, struct md_object *);

	int (*moo_file_lock)(const struct lu_env *env, struct md_object *obj,
			     struct lov_mds_md *lmm, struct ldlm_extent *extent,
			     struct lustre_handle *lockh);
	int (*moo_file_unlock)(const struct lu_env *env, struct md_object *obj,
			       struct lov_mds_md *lmm,
			       struct lustre_handle *lockh);
	int (*moo_object_lock)(const struct lu_env *env, struct md_object *obj,
			       struct lustre_handle *lh,
			       struct ldlm_enqueue_info *einfo,
			       void *policy);
};

/**
 * Operations implemented for each directory object.
 */
struct md_dir_operations {
        int (*mdo_is_subdir) (const struct lu_env *env, struct md_object *obj,
                              const struct lu_fid *fid, struct lu_fid *sfid);

        int (*mdo_lookup)(const struct lu_env *env, struct md_object *obj,
                          const struct lu_name *lname, struct lu_fid *fid,
                          struct md_op_spec *spec);

        mdl_mode_t (*mdo_lock_mode)(const struct lu_env *env,
                                    struct md_object *obj,
                                    mdl_mode_t mode);

        int (*mdo_create)(const struct lu_env *env, struct md_object *pobj,
                          const struct lu_name *lname, struct md_object *child,
                          struct md_op_spec *spec,
                          struct md_attr *ma);

        /** This method is used for creating data object for this meta object*/
        int (*mdo_create_data)(const struct lu_env *env, struct md_object *p,
                               struct md_object *o,
                               const struct md_op_spec *spec,
                               struct md_attr *ma);

        int (*mdo_rename)(const struct lu_env *env, struct md_object *spobj,
                          struct md_object *tpobj, const struct lu_fid *lf,
                          const struct lu_name *lsname, struct md_object *tobj,
                          const struct lu_name *ltname, struct md_attr *ma);

        int (*mdo_link)(const struct lu_env *env, struct md_object *tgt_obj,
                        struct md_object *src_obj, const struct lu_name *lname,
                        struct md_attr *ma);

	int (*mdo_unlink)(const struct lu_env *env, struct md_object *pobj,
			  struct md_object *cobj, const struct lu_name *lname,
			  struct md_attr *ma, int no_name);

        /** This method is used to compare a requested layout to an existing
         * layout (struct lov_mds_md_v1/3 vs struct lov_mds_md_v1/3) */
        int (*mdo_lum_lmm_cmp)(const struct lu_env *env,
                               struct md_object *cobj,
                               const struct md_op_spec *spec,
                               struct md_attr *ma);

        /** partial ops for cross-ref case */
        int (*mdo_name_insert)(const struct lu_env *env,
                               struct md_object *obj,
                               const struct lu_name *lname,
                               const struct lu_fid *fid,
                               const struct md_attr *ma);

        int (*mdo_name_remove)(const struct lu_env *env,
                               struct md_object *obj,
                               const struct lu_name *lname,
                               const struct md_attr *ma);

        int (*mdo_rename_tgt)(const struct lu_env *env, struct md_object *pobj,
                              struct md_object *tobj, const struct lu_fid *fid,
                              const struct lu_name *lname, struct md_attr *ma);
};

struct md_device_operations {
        /** meta-data device related handlers. */
	int (*mdo_root_get)(const struct lu_env *env, struct md_device *m,
			    struct lu_fid *f);

        int (*mdo_maxsize_get)(const struct lu_env *env, struct md_device *m,
                               int *md_size, int *cookie_size);

        int (*mdo_statfs)(const struct lu_env *env, struct md_device *m,
                          struct obd_statfs *sfs);

        int (*mdo_init_capa_ctxt)(const struct lu_env *env, struct md_device *m,
                                  int mode, unsigned long timeout, __u32 alg,
                                  struct lustre_capa_key *keys);

        int (*mdo_update_capa_key)(const struct lu_env *env,
                                   struct md_device *m,
                                   struct lustre_capa_key *key);

        int (*mdo_llog_ctxt_get)(const struct lu_env *env,
                                 struct md_device *m, int idx, void **h);

        int (*mdo_iocontrol)(const struct lu_env *env, struct md_device *m,
                             unsigned int cmd, int len, void *data);
};

enum md_upcall_event {
        /** Sync the md layer*/
        MD_LOV_SYNC = (1 << 0),
        /** Just for split, no need trans, for replay */
        MD_NO_TRANS = (1 << 1),
        MD_LOV_CONFIG = (1 << 2),
        /** Trigger quota recovery */
        MD_LOV_QUOTA = (1 << 3)
};

struct md_upcall {
        /** this lock protects upcall using against its removal
         * read lock is for usage the upcall, write - for init/fini */
	struct rw_semaphore	mu_upcall_sem;
        /** device to call, upper layer normally */
        struct md_device       *mu_upcall_dev;
        /** upcall function */
        int (*mu_upcall)(const struct lu_env *env, struct md_device *md,
                         enum md_upcall_event ev, void *data);
};

struct md_device {
        struct lu_device                   md_lu_dev;
        const struct md_device_operations *md_ops;
        struct md_upcall                   md_upcall;
};

static inline void md_upcall_init(struct md_device *m, void *upcl)
{
	init_rwsem(&m->md_upcall.mu_upcall_sem);
	m->md_upcall.mu_upcall_dev = NULL;
	m->md_upcall.mu_upcall = upcl;
}

static inline void md_upcall_dev_set(struct md_device *m, struct md_device *up)
{
	down_write(&m->md_upcall.mu_upcall_sem);
	m->md_upcall.mu_upcall_dev = up;
	up_write(&m->md_upcall.mu_upcall_sem);
}

static inline void md_upcall_fini(struct md_device *m)
{
	down_write(&m->md_upcall.mu_upcall_sem);
	m->md_upcall.mu_upcall_dev = NULL;
	m->md_upcall.mu_upcall = NULL;
	up_write(&m->md_upcall.mu_upcall_sem);
}

static inline int md_do_upcall(const struct lu_env *env, struct md_device *m,
				enum md_upcall_event ev, void *data)
{
	int rc = 0;
	down_read(&m->md_upcall.mu_upcall_sem);
	if (m->md_upcall.mu_upcall_dev != NULL &&
	    m->md_upcall.mu_upcall_dev->md_upcall.mu_upcall != NULL) {
		rc = m->md_upcall.mu_upcall_dev->md_upcall.mu_upcall(env,
					      m->md_upcall.mu_upcall_dev,
					      ev, data);
	}
	up_read(&m->md_upcall.mu_upcall_sem);
	return rc;
}

struct md_object {
        struct lu_object                   mo_lu;
        const struct md_object_operations *mo_ops;
        const struct md_dir_operations    *mo_dir_ops;
};

/**
 * seq-server site.
 */
struct seq_server_site {
	struct lu_site	     *ss_lu;
	/**
	 * mds number of this site.
	 */
	mdsno_t               ss_node_id;
	/**
	 * Fid location database
	 */
	struct lu_server_fld *ss_server_fld;
	struct lu_client_fld *ss_client_fld;

	/**
	 * Server Seq Manager
	 */
	struct lu_server_seq *ss_server_seq;

	/**
	 * Controller Seq Manager
	 */
	struct lu_server_seq *ss_control_seq;
	struct obd_export    *ss_control_exp;

	/**
	 * Client Seq Manager
	 */
	struct lu_client_seq *ss_client_seq;
};

static inline struct md_device *lu2md_dev(const struct lu_device *d)
{
        LASSERT(IS_ERR(d) || lu_device_is_md(d));
        return container_of0(d, struct md_device, md_lu_dev);
}

static inline struct lu_device *md2lu_dev(struct md_device *d)
{
        return &d->md_lu_dev;
}

static inline struct md_object *lu2md(const struct lu_object *o)
{
        LASSERT(o == NULL || IS_ERR(o) || lu_device_is_md(o->lo_dev));
        return container_of0(o, struct md_object, mo_lu);
}

static inline struct md_object *md_object_next(const struct md_object *obj)
{
        return (obj ? lu2md(lu_object_next(&obj->mo_lu)) : NULL);
}

static inline struct md_device *md_obj2dev(const struct md_object *o)
{
        LASSERT(o == NULL || IS_ERR(o) || lu_device_is_md(o->mo_lu.lo_dev));
        return container_of0(o->mo_lu.lo_dev, struct md_device, md_lu_dev);
}

static inline struct seq_server_site *lu_site2seq(const struct lu_site *s)
{
	return s->ld_seq_site;
}

static inline int md_device_init(struct md_device *md, struct lu_device_type *t)
{
        return lu_device_init(&md->md_lu_dev, t);
}

static inline void md_device_fini(struct md_device *md)
{
        lu_device_fini(&md->md_lu_dev);
}

static inline struct md_object *md_object_find_slice(const struct lu_env *env,
                                                     struct md_device *md,
                                                     const struct lu_fid *f)
{
        return lu2md(lu_object_find_slice(env, md2lu_dev(md), f, NULL));
}


/** md operations */
static inline int mo_permission(const struct lu_env *env,
                                struct md_object *p,
                                struct md_object *c,
                                struct md_attr *at,
                                int mask)
{
        LASSERT(c->mo_ops->moo_permission);
        return c->mo_ops->moo_permission(env, p, c, at, mask);
}

static inline int mo_attr_get(const struct lu_env *env,
                              struct md_object *m,
                              struct md_attr *at)
{
        LASSERT(m->mo_ops->moo_attr_get);
        return m->mo_ops->moo_attr_get(env, m, at);
}

static inline int mo_readlink(const struct lu_env *env,
                              struct md_object *m,
                              struct lu_buf *buf)
{
        LASSERT(m->mo_ops->moo_readlink);
        return m->mo_ops->moo_readlink(env, m, buf);
}

static inline int mo_changelog(const struct lu_env *env,
                               enum changelog_rec_type type,
                               int flags, struct md_object *m)
{
        LASSERT(m->mo_ops->moo_changelog);
        return m->mo_ops->moo_changelog(env, type, flags, m);
}

static inline int mo_attr_set(const struct lu_env *env,
                              struct md_object *m,
                              const struct md_attr *at)
{
        LASSERT(m->mo_ops->moo_attr_set);
        return m->mo_ops->moo_attr_set(env, m, at);
}

static inline int mo_xattr_get(const struct lu_env *env,
                               struct md_object *m,
                               struct lu_buf *buf,
                               const char *name)
{
        LASSERT(m->mo_ops->moo_xattr_get);
        return m->mo_ops->moo_xattr_get(env, m, buf, name);
}

static inline int mo_xattr_del(const struct lu_env *env,
                               struct md_object *m,
                               const char *name)
{
        LASSERT(m->mo_ops->moo_xattr_del);
        return m->mo_ops->moo_xattr_del(env, m, name);
}

static inline int mo_xattr_set(const struct lu_env *env,
                               struct md_object *m,
                               const struct lu_buf *buf,
                               const char *name,
                               int flags)
{
        LASSERT(m->mo_ops->moo_xattr_set);
        return m->mo_ops->moo_xattr_set(env, m, buf, name, flags);
}

static inline int mo_xattr_list(const struct lu_env *env,
                                struct md_object *m,
                                struct lu_buf *buf)
{
        LASSERT(m->mo_ops->moo_xattr_list);
        return m->mo_ops->moo_xattr_list(env, m, buf);
}

static inline int mo_swap_layouts(const struct lu_env *env,
				  struct md_object *o1,
				  struct md_object *o2, __u64 flags)
{
	LASSERT(o1->mo_ops->moo_swap_layouts);
	LASSERT(o2->mo_ops->moo_swap_layouts);
	if (o1->mo_ops->moo_swap_layouts != o2->mo_ops->moo_swap_layouts)
		return -EPERM;
	return o1->mo_ops->moo_swap_layouts(env, o1, o2, flags);
}

static inline int mo_open(const struct lu_env *env,
                          struct md_object *m,
                          int flags)
{
        LASSERT(m->mo_ops->moo_open);
        return m->mo_ops->moo_open(env, m, flags);
}

static inline int mo_close(const struct lu_env *env,
                           struct md_object *m,
                           struct md_attr *ma,
                           int mode)
{
        LASSERT(m->mo_ops->moo_close);
        return m->mo_ops->moo_close(env, m, ma, mode);
}

static inline int mo_readpage(const struct lu_env *env,
                              struct md_object *m,
                              const struct lu_rdpg *rdpg)
{
        LASSERT(m->mo_ops->moo_readpage);
        return m->mo_ops->moo_readpage(env, m, rdpg);
}

static inline int mo_object_create(const struct lu_env *env,
                                   struct md_object *m,
                                   const struct md_op_spec *spc,
                                   struct md_attr *at)
{
        LASSERT(m->mo_ops->moo_object_create);
        return m->mo_ops->moo_object_create(env, m, spc, at);
}

static inline int mo_ref_add(const struct lu_env *env,
                             struct md_object *m,
                             const struct md_attr *ma)
{
        LASSERT(m->mo_ops->moo_ref_add);
        return m->mo_ops->moo_ref_add(env, m, ma);
}

static inline int mo_ref_del(const struct lu_env *env,
                             struct md_object *m,
                             struct md_attr *ma)
{
        LASSERT(m->mo_ops->moo_ref_del);
        return m->mo_ops->moo_ref_del(env, m, ma);
}

static inline int mo_capa_get(const struct lu_env *env,
                              struct md_object *m,
                              struct lustre_capa *c,
                              int renewal)
{
        LASSERT(m->mo_ops->moo_capa_get);
        return m->mo_ops->moo_capa_get(env, m, c, renewal);
}

static inline int mo_object_sync(const struct lu_env *env, struct md_object *m)
{
        LASSERT(m->mo_ops->moo_object_sync);
        return m->mo_ops->moo_object_sync(env, m);
}

static inline int mo_file_lock(const struct lu_env *env, struct md_object *m,
                               struct lov_mds_md *lmm,
                               struct ldlm_extent *extent,
                               struct lustre_handle *lockh)
{
        LASSERT(m->mo_ops->moo_file_lock);
        return m->mo_ops->moo_file_lock(env, m, lmm, extent, lockh);
}

static inline int mo_file_unlock(const struct lu_env *env, struct md_object *m,
                                 struct lov_mds_md *lmm,
                                 struct lustre_handle *lockh)
{
        LASSERT(m->mo_ops->moo_file_unlock);
        return m->mo_ops->moo_file_unlock(env, m, lmm, lockh);
}

static inline int mo_object_lock(const struct lu_env *env,
				 struct md_object *m,
				 struct lustre_handle *lh,
				 struct ldlm_enqueue_info *einfo,
				 void *policy)
{
	LASSERT(m->mo_ops->moo_object_lock);
	return m->mo_ops->moo_object_lock(env, m, lh, einfo, policy);
}

static inline int mdo_lookup(const struct lu_env *env,
                             struct md_object *p,
                             const struct lu_name *lname,
                             struct lu_fid *f,
                             struct md_op_spec *spec)
{
        LASSERT(p->mo_dir_ops->mdo_lookup);
        return p->mo_dir_ops->mdo_lookup(env, p, lname, f, spec);
}

static inline mdl_mode_t mdo_lock_mode(const struct lu_env *env,
                                       struct md_object *mo,
                                       mdl_mode_t lm)
{
        if (mo->mo_dir_ops->mdo_lock_mode == NULL)
                return MDL_MINMODE;
        return mo->mo_dir_ops->mdo_lock_mode(env, mo, lm);
}

static inline int mdo_create(const struct lu_env *env,
                             struct md_object *p,
                             const struct lu_name *lchild_name,
                             struct md_object *c,
                             struct md_op_spec *spc,
                             struct md_attr *at)
{
	LASSERT(p->mo_dir_ops->mdo_create);
	return p->mo_dir_ops->mdo_create(env, p, lchild_name, c, spc, at);
}

static inline int mdo_create_data(const struct lu_env *env,
                                  struct md_object *p,
                                  struct md_object *c,
                                  const struct md_op_spec *spec,
                                  struct md_attr *ma)
{
        LASSERT(c->mo_dir_ops->mdo_create_data);
        return c->mo_dir_ops->mdo_create_data(env, p, c, spec, ma);
}

static inline int mdo_rename(const struct lu_env *env,
                             struct md_object *sp,
                             struct md_object *tp,
                             const struct lu_fid *lf,
                             const struct lu_name *lsname,
                             struct md_object *t,
                             const struct lu_name *ltname,
                             struct md_attr *ma)
{
        LASSERT(tp->mo_dir_ops->mdo_rename);
        return tp->mo_dir_ops->mdo_rename(env, sp, tp, lf, lsname, t, ltname,
                                          ma);
}

static inline int mdo_is_subdir(const struct lu_env *env,
                                struct md_object *mo,
                                const struct lu_fid *fid,
                                struct lu_fid *sfid)
{
        LASSERT(mo->mo_dir_ops->mdo_is_subdir);
        return mo->mo_dir_ops->mdo_is_subdir(env, mo, fid, sfid);
}

static inline int mdo_link(const struct lu_env *env,
                           struct md_object *p,
                           struct md_object *s,
                           const struct lu_name *lname,
                           struct md_attr *ma)
{
        LASSERT(s->mo_dir_ops->mdo_link);
        return s->mo_dir_ops->mdo_link(env, p, s, lname, ma);
}

static inline int mdo_unlink(const struct lu_env *env,
			     struct md_object *p,
			     struct md_object *c,
			     const struct lu_name *lname,
			     struct md_attr *ma, int no_name)
{
	LASSERT(p->mo_dir_ops->mdo_unlink);
	return p->mo_dir_ops->mdo_unlink(env, p, c, lname, ma, no_name);
}

static inline int mdo_lum_lmm_cmp(const struct lu_env *env,
                                  struct md_object *c,
                                  const struct md_op_spec *spec,
                                  struct md_attr *ma)
{
        LASSERT(c->mo_dir_ops->mdo_lum_lmm_cmp);
        return c->mo_dir_ops->mdo_lum_lmm_cmp(env, c, spec, ma);
}

static inline int mdo_name_insert(const struct lu_env *env,
                                  struct md_object *p,
                                  const struct lu_name *lname,
                                  const struct lu_fid *f,
                                  const struct md_attr *ma)
{
        LASSERT(p->mo_dir_ops->mdo_name_insert);
        return p->mo_dir_ops->mdo_name_insert(env, p, lname, f, ma);
}

static inline int mdo_name_remove(const struct lu_env *env,
                                  struct md_object *p,
                                  const struct lu_name *lname,
                                  const struct md_attr *ma)
{
        LASSERT(p->mo_dir_ops->mdo_name_remove);
        return p->mo_dir_ops->mdo_name_remove(env, p, lname, ma);
}

static inline int mdo_rename_tgt(const struct lu_env *env,
                                 struct md_object *p,
                                 struct md_object *t,
                                 const struct lu_fid *lf,
                                 const struct lu_name *lname,
                                 struct md_attr *ma)
{
        if (t) {
                LASSERT(t->mo_dir_ops->mdo_rename_tgt);
                return t->mo_dir_ops->mdo_rename_tgt(env, p, t, lf, lname, ma);
        } else {
                LASSERT(p->mo_dir_ops->mdo_rename_tgt);
                return p->mo_dir_ops->mdo_rename_tgt(env, p, t, lf, lname, ma);
        }
}

/**
 * Used in MDD/OUT layer for object lock rule
 **/
enum mdd_object_role {
	MOR_SRC_PARENT,
	MOR_SRC_CHILD,
	MOR_TGT_PARENT,
	MOR_TGT_CHILD,
	MOR_TGT_ORPHAN
};

struct dt_device;
/**
 * Structure to hold object information. This is used to create object
 * \pre llod_dir exist
 */
struct lu_local_obj_desc {
        const char                      *llod_dir;
        const char                      *llod_name;
        __u32                            llod_oid;
        int                              llod_is_index;
        const struct dt_index_features  *llod_feat;
        cfs_list_t                       llod_linkage;
};

int lustre_buf2som(void *buf, int rc, struct md_som_data *msd);
int lustre_buf2hsm(void *buf, int rc, struct md_hsm *mh);
void lustre_hsm2buf(void *buf, struct md_hsm *mh);

struct lu_ucred {
	__u32               uc_valid;
	__u32               uc_o_uid;
	__u32               uc_o_gid;
	__u32               uc_o_fsuid;
	__u32               uc_o_fsgid;
	__u32               uc_uid;
	__u32               uc_gid;
	__u32               uc_fsuid;
	__u32               uc_fsgid;
	__u32               uc_suppgids[2];
	cfs_cap_t           uc_cap;
	__u32               uc_umask;
	cfs_group_info_t   *uc_ginfo;
	struct md_identity *uc_identity;
};

struct lu_ucred *lu_ucred(const struct lu_env *env);

struct lu_ucred *lu_ucred_check(const struct lu_env *env);

struct lu_ucred *lu_ucred_assert(const struct lu_env *env);

int lu_ucred_global_init(void);

void lu_ucred_global_fini(void);

#define md_cap_t(x) (x)

#define MD_CAP_TO_MASK(x) (1 << (x))

#define md_cap_raised(c, flag) (md_cap_t(c) & MD_CAP_TO_MASK(flag))

/* capable() is copied from linux kernel! */
static inline int md_capable(struct lu_ucred *uc, cfs_cap_t cap)
{
	if (md_cap_raised(uc->uc_cap, cap))
		return 1;
	return 0;
}

/** @} md */
#endif /* _LINUX_MD_OBJECT_H */