1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/cmm/cmm_device.c
5 * Lustre Cluster Metadata Manager (cmm)
7 * Copyright (c) 2006 Cluster File Systems, Inc.
8 * Author: Mike Pershin <tappro@clusterfs.com>
10 * This file is part of the Lustre file system, http://www.lustre.org
11 * Lustre is a trademark of Cluster File Systems, Inc.
13 * You may have signed or agreed to another license before downloading
14 * this software. If so, you are bound by the terms and conditions
15 * of that agreement, and the following does not apply to you. See the
16 * LICENSE file included with this distribution for more information.
18 * If you did not agree to a different license, then this copy of Lustre
19 * is open source software; you can redistribute it and/or modify it
20 * under the terms of version 2 of the GNU General Public License as
21 * published by the Free Software Foundation.
23 * In either case, Lustre is distributed in the hope that it will be
24 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
25 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * license text for more details.
30 # define EXPORT_SYMTAB
32 #define DEBUG_SUBSYSTEM S_MDS
34 #include <linux/module.h>
37 #include <obd_class.h>
38 #include <lprocfs_status.h>
39 #include <lustre_ver.h>
40 #include "cmm_internal.h"
41 #include "mdc_internal.h"
43 static struct obd_ops cmm_obd_device_ops = {
44 .o_owner = THIS_MODULE
47 static struct lu_device_operations cmm_lu_ops;
49 static inline int lu_device_is_cmm(struct lu_device *d)
51 return ergo(d != NULL && d->ld_ops != NULL, d->ld_ops == &cmm_lu_ops);
54 int cmm_root_get(const struct lu_env *env, struct md_device *md,
57 struct cmm_device *cmm_dev = md2cmm_dev(md);
58 /* valid only on master MDS */
59 if (cmm_dev->cmm_local_num == 0)
60 return cmm_child_ops(cmm_dev)->mdo_root_get(env,
61 cmm_dev->cmm_child, fid);
66 static int cmm_statfs(const struct lu_env *env, struct md_device *md,
69 struct cmm_device *cmm_dev = md2cmm_dev(md);
73 rc = cmm_child_ops(cmm_dev)->mdo_statfs(env,
74 cmm_dev->cmm_child, sfs);
78 static int cmm_maxsize_get(const struct lu_env *env, struct md_device *md,
79 int *md_size, int *cookie_size)
81 struct cmm_device *cmm_dev = md2cmm_dev(md);
84 rc = cmm_child_ops(cmm_dev)->mdo_maxsize_get(env, cmm_dev->cmm_child,
85 md_size, cookie_size);
89 static int cmm_init_capa_keys(struct md_device *md,
90 struct lustre_capa_key *keys)
92 struct cmm_device *cmm_dev = md2cmm_dev(md);
95 LASSERT(cmm_child_ops(cmm_dev)->mdo_init_capa_keys);
96 rc = cmm_child_ops(cmm_dev)->mdo_init_capa_keys(cmm_dev->cmm_child,
101 static int cmm_update_capa_key(const struct lu_env *env,
102 struct md_device *md,
103 struct lustre_capa_key *key)
105 struct cmm_device *cmm_dev = md2cmm_dev(md);
108 rc = cmm_child_ops(cmm_dev)->mdo_update_capa_key(env,
114 static struct md_device_operations cmm_md_ops = {
115 .mdo_statfs = cmm_statfs,
116 .mdo_root_get = cmm_root_get,
117 .mdo_maxsize_get = cmm_maxsize_get,
118 .mdo_init_capa_keys = cmm_init_capa_keys,
119 .mdo_update_capa_key= cmm_update_capa_key,
122 extern struct lu_device_type mdc_device_type;
124 /* --- cmm_lu_operations --- */
125 /* add new MDC to the CMM, create MDC lu_device and connect it to mdc_obd */
126 static int cmm_add_mdc(const struct lu_env *env,
127 struct cmm_device *cm, struct lustre_cfg *cfg)
129 struct lu_device_type *ldt = &mdc_device_type;
130 char *p, *num = lustre_cfg_string(cfg, 2);
131 struct mdc_device *mc, *tmp;
132 struct lu_fld_target target;
133 struct lu_device *ld;
139 /* find out that there is no such mdc */
141 mdc_num = simple_strtol(num, &p, 10);
143 CERROR("Invalid index in lustre_cgf, offset 2\n");
147 spin_lock(&cm->cmm_tgt_guard);
148 list_for_each_entry_safe(mc, tmp, &cm->cmm_targets,
150 if (mc->mc_num == mdc_num) {
151 spin_unlock(&cm->cmm_tgt_guard);
155 spin_unlock(&cm->cmm_tgt_guard);
156 ld = ldt->ldt_ops->ldto_device_alloc(env, ldt, cfg);
157 ld->ld_site = cmm2lu_dev(cm)->ld_site;
159 rc = ldt->ldt_ops->ldto_device_init(env, ld, NULL);
161 ldt->ldt_ops->ldto_device_free(env, ld);
164 /* pass config to the just created MDC */
165 rc = ld->ld_ops->ldo_process_config(env, ld, cfg);
167 spin_lock(&cm->cmm_tgt_guard);
168 list_for_each_entry_safe(mc, tmp, &cm->cmm_targets,
170 if (mc->mc_num == mdc_num) {
171 spin_unlock(&cm->cmm_tgt_guard);
172 ldt->ldt_ops->ldto_device_fini(env, ld);
173 ldt->ldt_ops->ldto_device_free(env, ld);
178 list_add_tail(&mc->mc_linkage, &cm->cmm_targets);
180 spin_unlock(&cm->cmm_tgt_guard);
182 lu_device_get(cmm2lu_dev(cm));
184 ls = cm->cmm_md_dev.md_lu_dev.ld_site;
186 target.ft_srv = NULL;
187 target.ft_idx = mc->mc_num;
188 target.ft_exp = mc->mc_desc.cl_exp;
190 fld_client_add_target(ls->ls_client_fld, &target);
195 static void cmm_device_shutdown(const struct lu_env *env,
196 struct cmm_device *cm)
198 struct mdc_device *mc, *tmp;
201 /* finish all mdc devices */
202 spin_lock(&cm->cmm_tgt_guard);
203 list_for_each_entry_safe(mc, tmp, &cm->cmm_targets, mc_linkage) {
204 struct lu_device *ld_m = mdc2lu_dev(mc);
206 list_del_init(&mc->mc_linkage);
207 lu_device_put(cmm2lu_dev(cm));
208 ld_m->ld_type->ldt_ops->ldto_device_fini(env, ld_m);
209 ld_m->ld_type->ldt_ops->ldto_device_free(env, ld_m);
212 spin_unlock(&cm->cmm_tgt_guard);
216 static int cmm_device_mount(const struct lu_env *env,
217 struct cmm_device *m, struct lustre_cfg *cfg)
219 const char *index = lustre_cfg_string(cfg, 2);
222 LASSERT(index != NULL);
224 m->cmm_local_num = simple_strtol(index, &p, 10);
226 CERROR("Invalid index in lustre_cgf\n");
233 static int cmm_process_config(const struct lu_env *env,
234 struct lu_device *d, struct lustre_cfg *cfg)
236 struct cmm_device *m = lu2cmm_dev(d);
237 struct lu_device *next = md2lu_dev(m->cmm_child);
241 switch(cfg->lcfg_command) {
243 err = cmm_add_mdc(env, m, cfg);
244 /* the first ADD_MDC can be counted as setup is finished */
245 if ((m->cmm_flags & CMM_INITIALIZED) == 0)
246 m->cmm_flags |= CMM_INITIALIZED;
250 /* lower layers should be set up at first */
251 err = next->ld_ops->ldo_process_config(env, next, cfg);
253 err = cmm_device_mount(env, m, cfg);
258 cmm_device_shutdown(env, m);
261 err = next->ld_ops->ldo_process_config(env, next, cfg);
266 static int cmm_recovery_complete(const struct lu_env *env,
269 struct cmm_device *m = lu2cmm_dev(d);
270 struct lu_device *next = md2lu_dev(m->cmm_child);
273 rc = next->ld_ops->ldo_recovery_complete(env, next);
277 static struct lu_device_operations cmm_lu_ops = {
278 .ldo_object_alloc = cmm_object_alloc,
279 .ldo_process_config = cmm_process_config,
280 .ldo_recovery_complete = cmm_recovery_complete
283 /* --- lu_device_type operations --- */
284 int cmm_upcall(const struct lu_env *env, struct md_device *md,
285 enum md_upcall_event ev)
287 struct md_device *upcall_dev;
291 upcall_dev = md->md_upcall.mu_upcall_dev;
294 rc = upcall_dev->md_upcall.mu_upcall(env, md->md_upcall.mu_upcall_dev, ev);
299 static struct lu_device *cmm_device_alloc(const struct lu_env *env,
300 struct lu_device_type *t,
301 struct lustre_cfg *cfg)
304 struct cmm_device *m;
310 l = ERR_PTR(-ENOMEM);
312 md_device_init(&m->cmm_md_dev, t);
313 m->cmm_md_dev.md_ops = &cmm_md_ops;
314 m->cmm_md_dev.md_upcall.mu_upcall = cmm_upcall;
316 l->ld_ops = &cmm_lu_ops;
322 static void cmm_device_free(const struct lu_env *env, struct lu_device *d)
324 struct cmm_device *m = lu2cmm_dev(d);
326 LASSERT(m->cmm_tgt_count == 0);
327 LASSERT(list_empty(&m->cmm_targets));
328 md_device_fini(&m->cmm_md_dev);
332 /* context key constructor/destructor */
333 static void *cmm_key_init(const struct lu_context *ctx,
334 struct lu_context_key *key)
336 struct cmm_thread_info *info;
338 CLASSERT(CFS_PAGE_SIZE >= sizeof *info);
341 info = ERR_PTR(-ENOMEM);
345 static void cmm_key_fini(const struct lu_context *ctx,
346 struct lu_context_key *key, void *data)
348 struct cmm_thread_info *info = data;
352 struct lu_context_key cmm_thread_key = {
353 .lct_tags = LCT_MD_THREAD,
354 .lct_init = cmm_key_init,
355 .lct_fini = cmm_key_fini
358 static int cmm_type_init(struct lu_device_type *t)
360 return lu_context_key_register(&cmm_thread_key);
363 static void cmm_type_fini(struct lu_device_type *t)
365 lu_context_key_degister(&cmm_thread_key);
368 static int cmm_device_init(const struct lu_env *env,
369 struct lu_device *d, struct lu_device *next)
371 struct cmm_device *m = lu2cmm_dev(d);
375 spin_lock_init(&m->cmm_tgt_guard);
376 INIT_LIST_HEAD(&m->cmm_targets);
377 m->cmm_tgt_count = 0;
378 m->cmm_child = lu2md_dev(next);
383 static struct lu_device *cmm_device_fini(const struct lu_env *env,
384 struct lu_device *ld)
386 struct cmm_device *cm = lu2cmm_dev(ld);
388 RETURN (md2lu_dev(cm->cmm_child));
391 static struct lu_device_type_operations cmm_device_type_ops = {
392 .ldto_init = cmm_type_init,
393 .ldto_fini = cmm_type_fini,
395 .ldto_device_alloc = cmm_device_alloc,
396 .ldto_device_free = cmm_device_free,
398 .ldto_device_init = cmm_device_init,
399 .ldto_device_fini = cmm_device_fini
402 static struct lu_device_type cmm_device_type = {
403 .ldt_tags = LU_DEVICE_MD,
404 .ldt_name = LUSTRE_CMM_NAME,
405 .ldt_ops = &cmm_device_type_ops,
406 .ldt_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD
409 struct lprocfs_vars lprocfs_cmm_obd_vars[] = {
413 struct lprocfs_vars lprocfs_cmm_module_vars[] = {
417 LPROCFS_INIT_VARS(cmm, lprocfs_cmm_module_vars, lprocfs_cmm_obd_vars);
419 static int __init cmm_mod_init(void)
421 struct lprocfs_static_vars lvars;
423 printk(KERN_INFO "Lustre: Clustered Metadata Manager; info@clusterfs.com\n");
425 lprocfs_init_vars(cmm, &lvars);
426 return class_register_type(&cmm_obd_device_ops, NULL, lvars.module_vars,
427 LUSTRE_CMM_NAME, &cmm_device_type);
430 static void __exit cmm_mod_exit(void)
432 class_unregister_type(LUSTRE_CMM_NAME);
435 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
436 MODULE_DESCRIPTION("Lustre Clustered Metadata Manager ("LUSTRE_CMM_NAME")");
437 MODULE_LICENSE("GPL");
439 cfs_module(cmm, "0.1.0", cmm_mod_init, cmm_mod_exit);