1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/dt_object.c
39 * Generic functions from dt_object.h
41 * Author: Nikita Danilov <nikita@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_CLASS
46 # define EXPORT_SYMTAB
50 #include <dt_object.h>
51 #include <libcfs/list.h>
53 #include <lustre_fid.h>
56 struct lu_fid *dfh_fid;
57 struct dt_device *dfh_dt;
58 struct dt_object *dfh_o;
61 struct dt_thread_info {
62 char dti_buf[DT_MAX_PATH];
63 struct lu_fid_pack dti_pack;
64 struct dt_find_hint dti_dfh;
67 /* context key constructor/destructor: dt_global_key_init, dt_global_key_fini */
68 LU_KEY_INIT(dt_global, struct dt_thread_info);
69 LU_KEY_FINI(dt_global, struct dt_thread_info);
71 static struct lu_context_key dt_key = {
72 .lct_tags = LCT_MD_THREAD|LCT_DT_THREAD,
73 .lct_init = dt_global_key_init,
74 .lct_fini = dt_global_key_fini
77 /* no lock is necessary to protect the list, because call-backs
78 * are added during system startup. Please refer to "struct dt_device".
80 void dt_txn_callback_add(struct dt_device *dev, struct dt_txn_callback *cb)
82 list_add(&cb->dtc_linkage, &dev->dd_txn_callbacks);
84 EXPORT_SYMBOL(dt_txn_callback_add);
86 void dt_txn_callback_del(struct dt_device *dev, struct dt_txn_callback *cb)
88 list_del_init(&cb->dtc_linkage);
90 EXPORT_SYMBOL(dt_txn_callback_del);
92 int dt_txn_hook_start(const struct lu_env *env,
93 struct dt_device *dev, struct txn_param *param)
96 struct dt_txn_callback *cb;
99 list_for_each_entry(cb, &dev->dd_txn_callbacks, dtc_linkage) {
100 if (cb->dtc_txn_start == NULL)
102 result = cb->dtc_txn_start(env, param, cb->dtc_cookie);
108 EXPORT_SYMBOL(dt_txn_hook_start);
110 int dt_txn_hook_stop(const struct lu_env *env, struct thandle *txn)
112 struct dt_device *dev = txn->th_dev;
113 struct dt_txn_callback *cb;
117 list_for_each_entry(cb, &dev->dd_txn_callbacks, dtc_linkage) {
118 if (cb->dtc_txn_stop == NULL)
120 result = cb->dtc_txn_stop(env, txn, cb->dtc_cookie);
126 EXPORT_SYMBOL(dt_txn_hook_stop);
128 int dt_txn_hook_commit(const struct lu_env *env, struct thandle *txn)
130 struct dt_device *dev = txn->th_dev;
131 struct dt_txn_callback *cb;
135 list_for_each_entry(cb, &dev->dd_txn_callbacks, dtc_linkage) {
136 if (cb->dtc_txn_commit == NULL)
138 result = cb->dtc_txn_commit(env, txn, cb->dtc_cookie);
144 EXPORT_SYMBOL(dt_txn_hook_commit);
146 int dt_device_init(struct dt_device *dev, struct lu_device_type *t)
149 CFS_INIT_LIST_HEAD(&dev->dd_txn_callbacks);
150 return lu_device_init(&dev->dd_lu_dev, t);
152 EXPORT_SYMBOL(dt_device_init);
154 void dt_device_fini(struct dt_device *dev)
156 lu_device_fini(&dev->dd_lu_dev);
158 EXPORT_SYMBOL(dt_device_fini);
160 int dt_object_init(struct dt_object *obj,
161 struct lu_object_header *h, struct lu_device *d)
164 return lu_object_init(&obj->do_lu, h, d);
166 EXPORT_SYMBOL(dt_object_init);
168 void dt_object_fini(struct dt_object *obj)
170 lu_object_fini(&obj->do_lu);
172 EXPORT_SYMBOL(dt_object_fini);
174 int dt_try_as_dir(const struct lu_env *env, struct dt_object *obj)
176 if (obj->do_index_ops == NULL)
177 obj->do_ops->do_index_try(env, obj, &dt_directory_features);
178 return obj->do_index_ops != NULL;
180 EXPORT_SYMBOL(dt_try_as_dir);
182 enum dt_format_type dt_mode_to_dft(__u32 mode)
184 enum dt_format_type result;
186 switch (mode & S_IFMT) {
191 result = DFT_REGULAR;
209 EXPORT_SYMBOL(dt_mode_to_dft);
211 * lookup fid for object named \a name in directory \a dir.
214 static int dt_lookup(const struct lu_env *env, struct dt_object *dir,
215 const char *name, struct lu_fid *fid)
217 struct dt_thread_info *info = lu_context_key_get(&env->le_ctx,
219 struct lu_fid_pack *pack = &info->dti_pack;
220 struct dt_rec *rec = (struct dt_rec *)pack;
221 const struct dt_key *key = (const struct dt_key *)name;
224 if (dt_try_as_dir(env, dir)) {
225 result = dir->do_index_ops->dio_lookup(env, dir, rec, key,
228 result = fid_unpack(pack, fid);
229 else if (result == 0)
237 * get object for given \a fid.
239 struct dt_object *dt_locate(const struct lu_env *env,
240 struct dt_device *dev,
241 const struct lu_fid *fid)
243 struct lu_object *obj;
244 struct dt_object *dt;
246 obj = lu_object_find(env, &dev->dd_lu_dev, fid, NULL);
248 obj = lu_object_locate(obj->lo_header, dev->dd_lu_dev.ld_type);
249 LASSERT(obj != NULL);
250 dt = container_of(obj, struct dt_object, do_lu);
252 dt = (struct dt_object *)obj;
255 EXPORT_SYMBOL(dt_locate);
258 * find a object named \a entry in given \a dfh->dfh_o directory.
260 static int dt_find_entry(const struct lu_env *env, const char *entry, void *data)
262 struct dt_find_hint *dfh = data;
263 struct dt_device *dt = dfh->dfh_dt;
264 struct lu_fid *fid = dfh->dfh_fid;
265 struct dt_object *obj = dfh->dfh_o;
268 result = dt_lookup(env, obj, entry, fid);
269 lu_object_put(env, &obj->do_lu);
271 obj = dt_locate(env, dt, fid);
273 result = PTR_ERR(obj);
280 * Abstract function which parses path name. This function feeds
281 * path component to \a entry_func.
283 int dt_path_parser(const struct lu_env *env,
284 char *path, dt_entry_func_t entry_func,
291 e = strsep(&path, "/");
296 if (!path || path[0] == '\0')
300 rc = entry_func(env, e, data);
308 static struct dt_object *dt_store_resolve(const struct lu_env *env,
309 struct dt_device *dt,
313 struct dt_thread_info *info = lu_context_key_get(&env->le_ctx,
315 struct dt_find_hint *dfh = &info->dti_dfh;
316 struct dt_object *obj;
317 char *local = info->dti_buf;
323 strncpy(local, path, DT_MAX_PATH);
324 local[DT_MAX_PATH - 1] = '\0';
326 result = dt->dd_ops->dt_root_get(env, dt, fid);
328 obj = dt_locate(env, dt, fid);
331 result = dt_path_parser(env, local, dt_find_entry, dfh);
333 obj = ERR_PTR(result);
338 obj = ERR_PTR(result);
343 static struct dt_object *dt_reg_open(const struct lu_env *env,
344 struct dt_device *dt,
352 result = dt_lookup(env, p, name, fid);
354 o = dt_locate(env, dt, fid);
363 * Open dt object named \a filename from \a dirname directory.
364 * \param dt dt device
365 * \param fid on success, object fid is stored in *fid
367 struct dt_object *dt_store_open(const struct lu_env *env,
368 struct dt_device *dt,
370 const char *filename,
373 struct dt_object *file;
374 struct dt_object *dir;
376 dir = dt_store_resolve(env, dt, dirname, fid);
378 file = dt_reg_open(env, dt, dir,
380 lu_object_put(env, &dir->do_lu);
386 EXPORT_SYMBOL(dt_store_open);
388 /* dt class init function. */
389 int dt_global_init(void)
393 LU_CONTEXT_KEY_INIT(&dt_key);
394 result = lu_context_key_register(&dt_key);
398 void dt_global_fini(void)
400 lu_context_key_degister(&dt_key);
403 const struct dt_index_features dt_directory_features;
404 EXPORT_SYMBOL(dt_directory_features);