+++ /dev/null
-/*
- * 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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/obdclass/md_local_object.c
- *
- * Lustre Local Object create APIs
- * 'create on first mount' facility. Files registed under llo module will
- * be created on first mount.
- *
- * Author: Pravin Shelar <pravin.shelar@sun.com>
- */
-
-#define DEBUG_SUBSYSTEM S_CLASS
-
-#include <obd_support.h>
-#include <lustre_disk.h>
-#include <lustre_fid.h>
-#include <lu_object.h>
-#include <linux/list.h>
-#include <md_object.h>
-
-
-/** List head to hold list of objects to be created. */
-static struct list_head llo_lobj_list;
-
-/** Lock to protect list manipulations */
-static struct mutex llo_lock;
-
-/**
- * Structure used to maintain state of path parsing.
- * \see llo_find_entry, llo_store_resolve
- */
-struct llo_find_hint {
- struct lu_fid *lfh_cfid;
- struct md_device *lfh_md;
- struct md_object *lfh_pobj;
-};
-
-/**
- * Thread Local storage for this module.
- */
-struct llo_thread_info {
- /** buffer to resolve path */
- char lti_buf[DT_MAX_PATH];
- /** used for path resolve */
- struct lu_fid lti_fid;
- /** used to pass child object fid */
- struct lu_fid lti_cfid;
- struct llo_find_hint lti_lfh;
- struct md_op_spec lti_spc;
- struct md_attr lti_ma;
- struct lu_name lti_lname;
-};
-
-LU_KEY_INIT(llod_global, struct llo_thread_info);
-LU_KEY_FINI(llod_global, struct llo_thread_info);
-
-static struct lu_context_key llod_key = {
- .lct_tags = LCT_MD_THREAD,
- .lct_init = llod_global_key_init,
- .lct_fini = llod_global_key_fini
-};
-
-static inline struct llo_thread_info * llo_env_info(const struct lu_env *env)
-{
- return lu_context_key_get(&env->le_ctx, &llod_key);
-}
-
-/**
- * Search md object for given fid.
- */
-static struct md_object *llo_locate(const struct lu_env *env,
- struct md_device *md,
- const struct lu_fid *fid)
-{
- struct lu_object *obj;
- struct md_object *mdo;
-
- obj = lu_object_find(env, &md->md_lu_dev, fid, NULL);
- if (!IS_ERR(obj)) {
- obj = lu_object_locate(obj->lo_header, md->md_lu_dev.ld_type);
- LASSERT(obj != NULL);
- mdo = (struct md_object *) obj;
- } else
- mdo = (struct md_object *)obj;
- return mdo;
-}
-
-/**
- * Lookup FID for object named \a name in directory \a pobj.
- */
-static int llo_lookup(const struct lu_env *env,
- struct md_object *pobj,
- const char *name,
- struct lu_fid *fid)
-{
- struct llo_thread_info *info = llo_env_info(env);
- struct lu_name *lname = &info->lti_lname;
- struct md_op_spec *spec = &info->lti_spc;
-
- spec->sp_feat = NULL;
- spec->sp_cr_flags = 0;
- spec->sp_cr_lookup = 0;
- spec->sp_cr_mode = 0;
-
- lname->ln_name = name;
- lname->ln_namelen = strlen(name);
-
- return mdo_lookup(env, pobj, lname, fid, spec);
-}
-
-/**
- * Function to look up path component, this is passed to parsing
- * function. \see llo_store_resolve
- *
- * \retval rc returns error code for lookup or locate operation
- *
- * pointer to object is returned in data (lfh->lfh_pobj)
- */
-static int llo_find_entry(const struct lu_env *env,
- const char *name, void *data)
-{
- struct llo_find_hint *lfh = data;
- struct md_device *md = lfh->lfh_md;
- struct lu_fid *fid = lfh->lfh_cfid;
- struct md_object *obj = lfh->lfh_pobj;
- int result;
-
- /* lookup fid for object */
- result = llo_lookup(env, obj, name, fid);
- lu_object_put(env, &obj->mo_lu);
-
- if (result == 0) {
- /* get md object for fid that we got in lookup */
- obj = llo_locate(env, md, fid);
- if (IS_ERR(obj))
- result = PTR_ERR(obj);
- }
-
- lfh->lfh_pobj = obj;
- return result;
-}
-
-static struct md_object *llo_reg_open(const struct lu_env *env,
- struct md_device *md,
- struct md_object *p,
- const char *name,
- struct lu_fid *fid)
-{
- struct md_object *o;
- int result;
-
- result = llo_lookup(env, p, name, fid);
- if (result == 0)
- o = llo_locate(env, md, fid);
- else
- o = ERR_PTR(result);
-
- return o;
-}
-
-/**
- * Resolve given \a path, on success function returns
- * md object for last directory and \a fid points to
- * its fid.
- */
-struct md_object *llo_store_resolve(const struct lu_env *env,
- struct md_device *md,
- struct dt_device *dt,
- const char *path,
- struct lu_fid *fid)
-{
- struct llo_thread_info *info = llo_env_info(env);
- struct llo_find_hint *lfh = &info->lti_lfh;
- char *local = info->lti_buf;
- struct md_object *obj;
- int result;
-
- strncpy(local, path, DT_MAX_PATH);
- local[DT_MAX_PATH - 1] = '\0';
-
- lfh->lfh_md = md;
- lfh->lfh_cfid = fid;
- /* start path resolution from backend fs root. */
- result = dt->dd_ops->dt_root_get(env, dt, fid);
- if (result == 0) {
- /* get md object for root */
- obj = llo_locate(env, md, fid);
- if (!IS_ERR(obj)) {
- /* start path parser from root md */
- lfh->lfh_pobj = obj;
- result = dt_path_parser(env, local, llo_find_entry, lfh);
- if (result != 0)
- obj = ERR_PTR(result);
- else
- obj = lfh->lfh_pobj;
- }
- } else {
- obj = ERR_PTR(result);
- }
- return obj;
-}
-EXPORT_SYMBOL(llo_store_resolve);
-
-/**
- * Returns md object for \a objname in given \a dirname.
- */
-struct md_object *llo_store_open(const struct lu_env *env,
- struct md_device *md,
- struct dt_device *dt,
- const char *dirname,
- const char *objname,
- struct lu_fid *fid)
-{
- struct md_object *obj;
- struct md_object *dir;
-
- /* search md object for parent dir */
- dir = llo_store_resolve(env, md, dt, dirname, fid);
- if (!IS_ERR(dir)) {
- obj = llo_reg_open(env, md, dir, objname, fid);
- lu_object_put(env, &dir->mo_lu);
- } else
- obj = dir;
-
- return obj;
-}
-EXPORT_SYMBOL(llo_store_open);
-
-static struct md_object *llo_create_obj(const struct lu_env *env,
- struct md_device *md,
- struct md_object *dir,
- const char *objname,
- const struct lu_fid *fid,
- const struct dt_index_features *feat)
-{
- struct llo_thread_info *info = llo_env_info(env);
- struct md_object *mdo;
- struct md_attr *ma = &info->lti_ma;
- struct md_op_spec *spec = &info->lti_spc;
- struct lu_name *lname = &info->lti_lname;
- struct lu_attr *la = &ma->ma_attr;
- int rc;
-
- mdo = llo_locate(env, md, fid);
- if (IS_ERR(mdo))
- return mdo;
-
- lname->ln_name = objname;
- lname->ln_namelen = strlen(objname);
-
- spec->sp_feat = feat;
- spec->sp_cr_flags = 0;
- spec->sp_cr_lookup = 1;
- spec->sp_cr_mode = 0;
-
- if (feat == &dt_directory_features)
- la->la_mode = S_IFDIR | S_IXUGO;
- else
- la->la_mode = S_IFREG;
-
- la->la_mode |= S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
- la->la_uid = la->la_gid = 0;
- la->la_valid = LA_MODE | LA_UID | LA_GID;
-
- ma->ma_valid = 0;
- ma->ma_need = 0;
-
- rc = mdo_create(env, dir, lname, mdo, spec, ma);
-
- if (rc) {
- lu_object_put(env, &mdo->mo_lu);
- mdo = ERR_PTR(rc);
- }
-
- return mdo;
-}
-
-/**
- * Create md object, object could be diretcory or
- * special index defined by \a feat in \a directory.
- *
- * \param md device
- * \param dirname parent directory
- * \param objname file name
- * \param fid object fid
- * \param feat index features required for directory create
- */
-
-struct md_object *llo_store_create_index(const struct lu_env *env,
- struct md_device *md,
- struct dt_device *dt,
- const char *dirname,
- const char *objname,
- const struct lu_fid *fid,
- const struct dt_index_features *feat)
-{
- struct llo_thread_info *info = llo_env_info(env);
- struct md_object *obj;
- struct md_object *dir;
- struct lu_fid *ignore = &info->lti_fid;
-
- dir = llo_store_resolve(env, md, dt, dirname, ignore);
- if (!IS_ERR(dir)) {
- obj = llo_create_obj(env, md, dir, objname, fid, feat);
- lu_object_put(env, &dir->mo_lu);
- } else {
- obj = dir;
- }
- return obj;
-}
-
-EXPORT_SYMBOL(llo_store_create_index);
-
-/**
- * Create md object for regular file in \a directory.
- *
- * \param md device
- * \param dirname parent directory
- * \param objname file name
- * \param fid object fid.
- */
-
-struct md_object *llo_store_create(const struct lu_env *env,
- struct md_device *md,
- struct dt_device *dt,
- const char *dirname,
- const char *objname,
- const struct lu_fid *fid)
-{
- return llo_store_create_index(env, md, dt, dirname,
- objname, fid, NULL);
-}
-
-EXPORT_SYMBOL(llo_store_create);
-
-/**
- * Register object for 'create on first mount' facility.
- * objects are created in order of registration.
- */
-
-void llo_local_obj_register(struct lu_local_obj_desc *llod)
-{
- mutex_lock(&llo_lock);
- list_add_tail(&llod->llod_linkage, &llo_lobj_list);
- mutex_unlock(&llo_lock);
-}
-
-EXPORT_SYMBOL(llo_local_obj_register);
-
-void llo_local_obj_unregister(struct lu_local_obj_desc *llod)
-{
- mutex_lock(&llo_lock);
- list_del(&llod->llod_linkage);
- mutex_unlock(&llo_lock);
-}
-
-EXPORT_SYMBOL(llo_local_obj_unregister);
-
-/**
- * Created registed objects.
- */
-
-int llo_local_objects_setup(const struct lu_env *env,
- struct md_device * md,
- struct dt_device *dt)
-{
- struct llo_thread_info *info = llo_env_info(env);
- struct lu_fid *fid;
- struct lu_local_obj_desc *scan;
- struct md_object *mdo;
- const char *dir;
- int rc = 0;
-
- fid = &info->lti_cfid;
- mutex_lock(&llo_lock);
-
- list_for_each_entry(scan, &llo_lobj_list, llod_linkage) {
- lu_local_obj_fid(fid, scan->llod_oid);
- dir = "";
- if (scan->llod_dir)
- dir = scan->llod_dir;
-
- if (scan->llod_is_index)
- mdo = llo_store_create_index(env, md, dt ,
- dir, scan->llod_name,
- fid,
- scan->llod_feat);
- else
- mdo = llo_store_create(env, md, dt,
- dir, scan->llod_name,
- fid);
- if (IS_ERR(mdo) && PTR_ERR(mdo) != -EEXIST) {
- rc = PTR_ERR(mdo);
- CERROR("creating obj [%s] fid = "DFID" rc = %d\n",
- scan->llod_name, PFID(fid), rc);
- goto out;
- }
-
- if (!IS_ERR(mdo))
- lu_object_put(env, &mdo->mo_lu);
- }
-
-out:
- mutex_unlock(&llo_lock);
- return rc;
-}
-
-EXPORT_SYMBOL(llo_local_objects_setup);
-
-int llo_global_init(void)
-{
- int result;
-
- INIT_LIST_HEAD(&llo_lobj_list);
- mutex_init(&llo_lock);
-
- LU_CONTEXT_KEY_INIT(&llod_key);
- result = lu_context_key_register(&llod_key);
- return result;
-}
-
-void llo_global_fini(void)
-{
- lu_context_key_degister(&llod_key);
- LASSERT(list_empty(&llo_lobj_list));
-}
projects / mirror_ubuntu-kernels.git / commitdiff