+++ /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 COPYING file that accompanied this code.
-
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2012, Intel Corporation.
- */
-/*
- * lustre/obdclass/local_storage.c
- *
- * Local storage for file/objects with fid generation. Works on top of OSD.
- *
- * Author: Mikhail Pershin <mike.pershin@intel.com>
- */
-
-#define DEBUG_SUBSYSTEM S_CLASS
-
-#include "local_storage.h"
-
-/* all initialized local storages on this node are linked on this */
-static LIST_HEAD(ls_list_head);
-static DEFINE_MUTEX(ls_list_mutex);
-
-static int ls_object_init(const struct lu_env *env, struct lu_object *o,
- const struct lu_object_conf *unused)
-{
- struct ls_device *ls;
- struct lu_object *below;
- struct lu_device *under;
-
- ls = container_of0(o->lo_dev, struct ls_device, ls_top_dev.dd_lu_dev);
- under = &ls->ls_osd->dd_lu_dev;
- below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
- if (below == NULL)
- return -ENOMEM;
-
- lu_object_add(o, below);
-
- return 0;
-}
-
-static void ls_object_free(const struct lu_env *env, struct lu_object *o)
-{
- struct ls_object *obj = lu2ls_obj(o);
- struct lu_object_header *h = o->lo_header;
-
- dt_object_fini(&obj->ls_obj);
- lu_object_header_fini(h);
- OBD_FREE_PTR(obj);
-}
-
-struct lu_object_operations ls_lu_obj_ops = {
- .loo_object_init = ls_object_init,
- .loo_object_free = ls_object_free,
-};
-
-struct lu_object *ls_object_alloc(const struct lu_env *env,
- const struct lu_object_header *_h,
- struct lu_device *d)
-{
- struct lu_object_header *h;
- struct ls_object *o;
- struct lu_object *l;
-
- LASSERT(_h == NULL);
-
- OBD_ALLOC_PTR(o);
- if (o != NULL) {
- l = &o->ls_obj.do_lu;
- h = &o->ls_header;
-
- lu_object_header_init(h);
- dt_object_init(&o->ls_obj, h, d);
- lu_object_add_top(h, l);
-
- l->lo_ops = &ls_lu_obj_ops;
-
- return l;
- } else {
- return NULL;
- }
-}
-
-static struct lu_device_operations ls_lu_dev_ops = {
- .ldo_object_alloc = ls_object_alloc
-};
-
-static struct ls_device *__ls_find_dev(struct dt_device *dev)
-{
- struct ls_device *ls, *ret = NULL;
-
- list_for_each_entry(ls, &ls_list_head, ls_linkage) {
- if (ls->ls_osd == dev) {
- atomic_inc(&ls->ls_refcount);
- ret = ls;
- break;
- }
- }
- return ret;
-}
-
-struct ls_device *ls_find_dev(struct dt_device *dev)
-{
- struct ls_device *ls;
-
- mutex_lock(&ls_list_mutex);
- ls = __ls_find_dev(dev);
- mutex_unlock(&ls_list_mutex);
-
- return ls;
-}
-
-static struct lu_device_type_operations ls_device_type_ops = {
- .ldto_start = NULL,
- .ldto_stop = NULL,
-};
-
-static struct lu_device_type ls_lu_type = {
- .ldt_name = "local_storage",
- .ldt_ops = &ls_device_type_ops,
-};
-
-struct ls_device *ls_device_get(struct dt_device *dev)
-{
- struct ls_device *ls;
-
- mutex_lock(&ls_list_mutex);
- ls = __ls_find_dev(dev);
- if (ls)
- GOTO(out_ls, ls);
-
- /* not found, then create */
- OBD_ALLOC_PTR(ls);
- if (ls == NULL)
- GOTO(out_ls, ls = ERR_PTR(-ENOMEM));
-
- atomic_set(&ls->ls_refcount, 1);
- INIT_LIST_HEAD(&ls->ls_los_list);
- mutex_init(&ls->ls_los_mutex);
-
- ls->ls_osd = dev;
-
- LASSERT(dev->dd_lu_dev.ld_site);
- lu_device_init(&ls->ls_top_dev.dd_lu_dev, &ls_lu_type);
- ls->ls_top_dev.dd_lu_dev.ld_ops = &ls_lu_dev_ops;
- ls->ls_top_dev.dd_lu_dev.ld_site = dev->dd_lu_dev.ld_site;
-
- /* finally add ls to the list */
- list_add(&ls->ls_linkage, &ls_list_head);
-out_ls:
- mutex_unlock(&ls_list_mutex);
- return ls;
-}
-
-void ls_device_put(const struct lu_env *env, struct ls_device *ls)
-{
- LASSERT(env);
- if (!atomic_dec_and_test(&ls->ls_refcount))
- return;
-
- mutex_lock(&ls_list_mutex);
- if (atomic_read(&ls->ls_refcount) == 0) {
- LASSERT(list_empty(&ls->ls_los_list));
- list_del(&ls->ls_linkage);
- lu_site_purge(env, ls->ls_top_dev.dd_lu_dev.ld_site, ~0);
- lu_device_fini(&ls->ls_top_dev.dd_lu_dev);
- OBD_FREE_PTR(ls);
- }
- mutex_unlock(&ls_list_mutex);
-}
-
-/**
- * local file fid generation
- */
-int local_object_fid_generate(const struct lu_env *env,
- struct local_oid_storage *los,
- struct lu_fid *fid)
-{
- LASSERT(los->los_dev);
- LASSERT(los->los_obj);
-
- /* take next OID */
-
- /* to make it unique after reboot we store
- * the latest generated fid atomically with
- * object creation see local_object_create() */
-
- mutex_lock(&los->los_id_lock);
- fid->f_seq = los->los_seq;
- fid->f_oid = ++los->los_last_oid;
- fid->f_ver = 0;
- mutex_unlock(&los->los_id_lock);
-
- return 0;
-}
-
-int local_object_declare_create(const struct lu_env *env,
- struct local_oid_storage *los,
- struct dt_object *o, struct lu_attr *attr,
- struct dt_object_format *dof,
- struct thandle *th)
-{
- struct dt_thread_info *dti = dt_info(env);
- int rc;
-
- /* update fid generation file */
- if (los != NULL) {
- LASSERT(dt_object_exists(los->los_obj));
- rc = dt_declare_record_write(env, los->los_obj,
- sizeof(struct los_ondisk), 0, th);
- if (rc)
- return rc;
- }
-
- rc = dt_declare_create(env, o, attr, NULL, dof, th);
- if (rc)
- return rc;
-
- dti->dti_lb.lb_buf = NULL;
- dti->dti_lb.lb_len = sizeof(dti->dti_lma);
- rc = dt_declare_xattr_set(env, o, &dti->dti_lb, XATTR_NAME_LMA, 0, th);
-
- return rc;
-}
-
-int local_object_create(const struct lu_env *env,
- struct local_oid_storage *los,
- struct dt_object *o, struct lu_attr *attr,
- struct dt_object_format *dof, struct thandle *th)
-{
- struct dt_thread_info *dti = dt_info(env);
- __le64 lastid;
- int rc;
-
- rc = dt_create(env, o, attr, NULL, dof, th);
- if (rc)
- return rc;
-
- if (los == NULL)
- return rc;
-
- LASSERT(los->los_obj);
- LASSERT(dt_object_exists(los->los_obj));
-
- /* many threads can be updated this, serialize
- * them here to avoid the race where one thread
- * takes the value first, but writes it last */
- mutex_lock(&los->los_id_lock);
-
- /* update local oid number on disk so that
- * we know the last one used after reboot */
- lastid = cpu_to_le64(los->los_last_oid);
-
- dti->dti_off = 0;
- dti->dti_lb.lb_buf = &lastid;
- dti->dti_lb.lb_len = sizeof(lastid);
- rc = dt_record_write(env, los->los_obj, &dti->dti_lb, &dti->dti_off,
- th);
- mutex_unlock(&los->los_id_lock);
-
- return rc;
-}
-
-/*
- * Create local named object (file, directory or index) in parent directory.
- */
-struct dt_object *__local_file_create(const struct lu_env *env,
- const struct lu_fid *fid,
- struct local_oid_storage *los,
- struct ls_device *ls,
- struct dt_object *parent,
- const char *name, struct lu_attr *attr,
- struct dt_object_format *dof)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *dto;
- struct thandle *th;
- int rc;
-
- dto = ls_locate(env, ls, fid);
- if (unlikely(IS_ERR(dto)))
- return dto;
-
- LASSERT(dto != NULL);
- if (dt_object_exists(dto))
- GOTO(out, rc = -EEXIST);
-
- th = dt_trans_create(env, ls->ls_osd);
- if (IS_ERR(th))
- GOTO(out, rc = PTR_ERR(th));
-
- rc = local_object_declare_create(env, los, dto, attr, dof, th);
- if (rc)
- GOTO(trans_stop, rc);
-
- if (dti->dti_dof.dof_type == DFT_DIR) {
- dt_declare_ref_add(env, dto, th);
- dt_declare_ref_add(env, parent, th);
- }
-
- rc = dt_declare_insert(env, parent, (void *)fid, (void *)name, th);
- if (rc)
- GOTO(trans_stop, rc);
-
- rc = dt_trans_start_local(env, ls->ls_osd, th);
- if (rc)
- GOTO(trans_stop, rc);
-
- dt_write_lock(env, dto, 0);
- if (dt_object_exists(dto))
- GOTO(unlock, rc = 0);
-
- CDEBUG(D_OTHER, "create new object "DFID"\n",
- PFID(lu_object_fid(&dto->do_lu)));
- rc = local_object_create(env, los, dto, attr, dof, th);
- if (rc)
- GOTO(unlock, rc);
- LASSERT(dt_object_exists(dto));
-
- if (dti->dti_dof.dof_type == DFT_DIR) {
- if (!dt_try_as_dir(env, dto))
- GOTO(destroy, rc = -ENOTDIR);
- /* Add "." and ".." for newly created dir */
- rc = dt_insert(env, dto, (void *)fid, (void *)".", th,
- BYPASS_CAPA, 1);
- if (rc)
- GOTO(destroy, rc);
- dt_ref_add(env, dto, th);
- rc = dt_insert(env, dto, (void *)lu_object_fid(&parent->do_lu),
- (void *)"..", th, BYPASS_CAPA, 1);
- if (rc)
- GOTO(destroy, rc);
- }
-
- dt_write_lock(env, parent, 0);
- rc = dt_insert(env, parent, (const struct dt_rec *)fid,
- (const struct dt_key *)name, th, BYPASS_CAPA, 1);
- if (dti->dti_dof.dof_type == DFT_DIR)
- dt_ref_add(env, parent, th);
- dt_write_unlock(env, parent);
- if (rc)
- GOTO(destroy, rc);
-destroy:
- if (rc)
- dt_destroy(env, dto, th);
-unlock:
- dt_write_unlock(env, dto);
-trans_stop:
- dt_trans_stop(env, ls->ls_osd, th);
-out:
- if (rc) {
- lu_object_put_nocache(env, &dto->do_lu);
- dto = ERR_PTR(rc);
- }
- return dto;
-}
-
-/*
- * Look up and create (if it does not exist) a local named file or directory in
- * parent directory.
- */
-struct dt_object *local_file_find_or_create(const struct lu_env *env,
- struct local_oid_storage *los,
- struct dt_object *parent,
- const char *name, __u32 mode)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *dto;
- int rc;
-
- LASSERT(parent);
-
- rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
- if (rc == 0)
- /* name is found, get the object */
- dto = ls_locate(env, dt2ls_dev(los->los_dev), &dti->dti_fid);
- else if (rc != -ENOENT)
- dto = ERR_PTR(rc);
- else {
- rc = local_object_fid_generate(env, los, &dti->dti_fid);
- if (rc < 0) {
- dto = ERR_PTR(rc);
- } else {
- /* create the object */
- dti->dti_attr.la_valid = LA_MODE;
- dti->dti_attr.la_mode = mode;
- dti->dti_dof.dof_type = dt_mode_to_dft(mode & S_IFMT);
- dto = __local_file_create(env, &dti->dti_fid, los,
- dt2ls_dev(los->los_dev),
- parent, name, &dti->dti_attr,
- &dti->dti_dof);
- }
- }
- return dto;
-}
-EXPORT_SYMBOL(local_file_find_or_create);
-
-struct dt_object *local_file_find_or_create_with_fid(const struct lu_env *env,
- struct dt_device *dt,
- const struct lu_fid *fid,
- struct dt_object *parent,
- const char *name,
- __u32 mode)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *dto;
- int rc;
-
- LASSERT(parent);
-
- rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
- if (rc == 0) {
- dto = dt_locate(env, dt, &dti->dti_fid);
- } else if (rc != -ENOENT) {
- dto = ERR_PTR(rc);
- } else {
- struct ls_device *ls;
-
- ls = ls_device_get(dt);
- if (IS_ERR(ls)) {
- dto = ERR_CAST(ls);
- } else {
- /* create the object */
- dti->dti_attr.la_valid = LA_MODE;
- dti->dti_attr.la_mode = mode;
- dti->dti_dof.dof_type = dt_mode_to_dft(mode & S_IFMT);
- dto = __local_file_create(env, fid, NULL, ls, parent,
- name, &dti->dti_attr,
- &dti->dti_dof);
- /* ls_device_put() will finalize the ls device, we
- * have to open the object in other device stack */
- if (!IS_ERR(dto)) {
- dti->dti_fid = dto->do_lu.lo_header->loh_fid;
- lu_object_put_nocache(env, &dto->do_lu);
- dto = dt_locate(env, dt, &dti->dti_fid);
- }
- ls_device_put(env, ls);
- }
- }
- return dto;
-}
-EXPORT_SYMBOL(local_file_find_or_create_with_fid);
-
-/*
- * Look up and create (if it does not exist) a local named index file in parent
- * directory.
- */
-struct dt_object *local_index_find_or_create(const struct lu_env *env,
- struct local_oid_storage *los,
- struct dt_object *parent,
- const char *name, __u32 mode,
- const struct dt_index_features *ft)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *dto;
- int rc;
-
- LASSERT(parent);
-
- rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
- if (rc == 0) {
- /* name is found, get the object */
- dto = ls_locate(env, dt2ls_dev(los->los_dev), &dti->dti_fid);
- } else if (rc != -ENOENT) {
- dto = ERR_PTR(rc);
- } else {
- rc = local_object_fid_generate(env, los, &dti->dti_fid);
- if (rc < 0) {
- dto = ERR_PTR(rc);
- } else {
- /* create the object */
- dti->dti_attr.la_valid = LA_MODE;
- dti->dti_attr.la_mode = mode;
- dti->dti_dof.dof_type = DFT_INDEX;
- dti->dti_dof.u.dof_idx.di_feat = ft;
- dto = __local_file_create(env, &dti->dti_fid, los,
- dt2ls_dev(los->los_dev),
- parent, name, &dti->dti_attr,
- &dti->dti_dof);
- }
- }
- return dto;
-
-}
-EXPORT_SYMBOL(local_index_find_or_create);
-
-struct dt_object *
-local_index_find_or_create_with_fid(const struct lu_env *env,
- struct dt_device *dt,
- const struct lu_fid *fid,
- struct dt_object *parent,
- const char *name, __u32 mode,
- const struct dt_index_features *ft)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *dto;
- int rc;
-
- LASSERT(parent);
-
- rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
- if (rc == 0) {
- /* name is found, get the object */
- if (!lu_fid_eq(fid, &dti->dti_fid))
- dto = ERR_PTR(-EINVAL);
- else
- dto = dt_locate(env, dt, fid);
- } else if (rc != -ENOENT) {
- dto = ERR_PTR(rc);
- } else {
- struct ls_device *ls;
-
- ls = ls_device_get(dt);
- if (IS_ERR(ls)) {
- dto = ERR_CAST(ls);
- } else {
- /* create the object */
- dti->dti_attr.la_valid = LA_MODE;
- dti->dti_attr.la_mode = mode;
- dti->dti_dof.dof_type = DFT_INDEX;
- dti->dti_dof.u.dof_idx.di_feat = ft;
- dto = __local_file_create(env, fid, NULL, ls, parent,
- name, &dti->dti_attr,
- &dti->dti_dof);
- /* ls_device_put() will finalize the ls device, we
- * have to open the object in other device stack */
- if (!IS_ERR(dto)) {
- dti->dti_fid = dto->do_lu.lo_header->loh_fid;
- lu_object_put_nocache(env, &dto->do_lu);
- dto = dt_locate(env, dt, &dti->dti_fid);
- }
- ls_device_put(env, ls);
- }
- }
- return dto;
-}
-EXPORT_SYMBOL(local_index_find_or_create_with_fid);
-
-static int local_object_declare_unlink(const struct lu_env *env,
- struct dt_device *dt,
- struct dt_object *p,
- struct dt_object *c, const char *name,
- struct thandle *th)
-{
- int rc;
-
- rc = dt_declare_delete(env, p, (const struct dt_key *)name, th);
- if (rc < 0)
- return rc;
-
- rc = dt_declare_ref_del(env, c, th);
- if (rc < 0)
- return rc;
-
- return dt_declare_destroy(env, c, th);
-}
-
-int local_object_unlink(const struct lu_env *env, struct dt_device *dt,
- struct dt_object *parent, const char *name)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *dto;
- struct thandle *th;
- int rc;
-
- rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
- if (rc == -ENOENT)
- return 0;
- else if (rc < 0)
- return rc;
-
- dto = dt_locate(env, dt, &dti->dti_fid);
- if (unlikely(IS_ERR(dto)))
- return PTR_ERR(dto);
-
- th = dt_trans_create(env, dt);
- if (IS_ERR(th))
- GOTO(out, rc = PTR_ERR(th));
-
- rc = local_object_declare_unlink(env, dt, parent, dto, name, th);
- if (rc < 0)
- GOTO(stop, rc);
-
- rc = dt_trans_start_local(env, dt, th);
- if (rc < 0)
- GOTO(stop, rc);
-
- dt_write_lock(env, dto, 0);
- rc = dt_delete(env, parent, (struct dt_key *)name, th, BYPASS_CAPA);
- if (rc < 0)
- GOTO(unlock, rc);
-
- rc = dt_ref_del(env, dto, th);
- if (rc < 0) {
- rc = dt_insert(env, parent,
- (const struct dt_rec *)&dti->dti_fid,
- (const struct dt_key *)name, th, BYPASS_CAPA, 1);
- GOTO(unlock, rc);
- }
-
- rc = dt_destroy(env, dto, th);
-unlock:
- dt_write_unlock(env, dto);
-stop:
- dt_trans_stop(env, dt, th);
-out:
- lu_object_put_nocache(env, &dto->do_lu);
- return rc;
-}
-EXPORT_SYMBOL(local_object_unlink);
-
-struct local_oid_storage *dt_los_find(struct ls_device *ls, __u64 seq)
-{
- struct local_oid_storage *los, *ret = NULL;
-
- list_for_each_entry(los, &ls->ls_los_list, los_list) {
- if (los->los_seq == seq) {
- atomic_inc(&los->los_refcount);
- ret = los;
- break;
- }
- }
- return ret;
-}
-
-void dt_los_put(struct local_oid_storage *los)
-{
- if (atomic_dec_and_test(&los->los_refcount))
- /* should never happen, only local_oid_storage_fini should
- * drop refcount to zero */
- LBUG();
- return;
-}
-
-/* after Lustre 2.3 release there may be old file to store last generated FID
- * If such file exists then we have to read its content
- */
-int lastid_compat_check(const struct lu_env *env, struct dt_device *dev,
- __u64 lastid_seq, __u32 *first_oid, struct ls_device *ls)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct dt_object *root = NULL;
- struct los_ondisk losd;
- struct dt_object *o = NULL;
- int rc = 0;
-
- rc = dt_root_get(env, dev, &dti->dti_fid);
- if (rc)
- return rc;
-
- root = ls_locate(env, ls, &dti->dti_fid);
- if (IS_ERR(root))
- return PTR_ERR(root);
-
- /* find old last_id file */
- snprintf(dti->dti_buf, sizeof(dti->dti_buf), "seq-%#llx-lastid",
- lastid_seq);
- rc = dt_lookup_dir(env, root, dti->dti_buf, &dti->dti_fid);
- lu_object_put_nocache(env, &root->do_lu);
- if (rc == -ENOENT) {
- /* old llog lastid accessed by FID only */
- if (lastid_seq != FID_SEQ_LLOG)
- return 0;
- dti->dti_fid.f_seq = FID_SEQ_LLOG;
- dti->dti_fid.f_oid = 1;
- dti->dti_fid.f_ver = 0;
- o = ls_locate(env, ls, &dti->dti_fid);
- if (IS_ERR(o))
- return PTR_ERR(o);
-
- if (!dt_object_exists(o)) {
- lu_object_put_nocache(env, &o->do_lu);
- return 0;
- }
- CDEBUG(D_INFO, "Found old llog lastid file\n");
- } else if (rc < 0) {
- return rc;
- } else {
- CDEBUG(D_INFO, "Found old lastid file for sequence %#llx\n",
- lastid_seq);
- o = ls_locate(env, ls, &dti->dti_fid);
- if (IS_ERR(o))
- return PTR_ERR(o);
- }
- /* let's read seq-NNNNNN-lastid file value */
- LASSERT(dt_object_exists(o));
- dti->dti_off = 0;
- dti->dti_lb.lb_buf = &losd;
- dti->dti_lb.lb_len = sizeof(losd);
- dt_read_lock(env, o, 0);
- rc = dt_record_read(env, o, &dti->dti_lb, &dti->dti_off);
- dt_read_unlock(env, o);
- lu_object_put_nocache(env, &o->do_lu);
- if (rc == 0 && le32_to_cpu(losd.lso_magic) != LOS_MAGIC) {
- CERROR("%s: wrong content of seq-%#llx-lastid file, magic %x\n",
- o->do_lu.lo_dev->ld_obd->obd_name, lastid_seq,
- le32_to_cpu(losd.lso_magic));
- return -EINVAL;
- } else if (rc < 0) {
- CERROR("%s: failed to read seq-%#llx-lastid: rc = %d\n",
- o->do_lu.lo_dev->ld_obd->obd_name, lastid_seq, rc);
- return rc;
- }
- *first_oid = le32_to_cpu(losd.lso_next_oid);
- return rc;
-}
-
-/**
- * Initialize local OID storage for required sequence.
- * That may be needed for services that uses local files and requires
- * dynamic OID allocation for them.
- *
- * Per each sequence we have an object with 'first_fid' identificator
- * containing the counter for OIDs of locally created files with that
- * sequence.
- *
- * It is used now by llog subsystem and MGS for NID tables
- *
- * Function gets first_fid to create counter object.
- * All dynamic fids will be generated with the same sequence and incremented
- * OIDs
- *
- * Returned local_oid_storage is in-memory representation of OID storage
- */
-int local_oid_storage_init(const struct lu_env *env, struct dt_device *dev,
- const struct lu_fid *first_fid,
- struct local_oid_storage **los)
-{
- struct dt_thread_info *dti = dt_info(env);
- struct ls_device *ls;
- u64 lastid;
- struct dt_object *o = NULL;
- struct thandle *th;
- __u32 first_oid = fid_oid(first_fid);
- int rc = 0;
-
- ls = ls_device_get(dev);
- if (IS_ERR(ls))
- return PTR_ERR(ls);
-
- mutex_lock(&ls->ls_los_mutex);
- *los = dt_los_find(ls, fid_seq(first_fid));
- if (*los != NULL)
- GOTO(out, rc = 0);
-
- /* not found, then create */
- OBD_ALLOC_PTR(*los);
- if (*los == NULL)
- GOTO(out, rc = -ENOMEM);
-
- atomic_set(&(*los)->los_refcount, 1);
- mutex_init(&(*los)->los_id_lock);
- (*los)->los_dev = &ls->ls_top_dev;
- atomic_inc(&ls->ls_refcount);
- list_add(&(*los)->los_list, &ls->ls_los_list);
-
- /* Use {seq, 0, 0} to create the LAST_ID file for every
- * sequence. OIDs start at LUSTRE_FID_INIT_OID.
- */
- dti->dti_fid.f_seq = fid_seq(first_fid);
- dti->dti_fid.f_oid = LUSTRE_FID_LASTID_OID;
- dti->dti_fid.f_ver = 0;
- o = ls_locate(env, ls, &dti->dti_fid);
- if (IS_ERR(o))
- GOTO(out_los, rc = PTR_ERR(o));
-
- if (!dt_object_exists(o)) {
- rc = lastid_compat_check(env, dev, fid_seq(first_fid),
- &first_oid, ls);
- if (rc < 0)
- GOTO(out_los, rc);
-
- th = dt_trans_create(env, dev);
- if (IS_ERR(th))
- GOTO(out_los, rc = PTR_ERR(th));
-
- dti->dti_attr.la_valid = LA_MODE | LA_TYPE;
- dti->dti_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
- dti->dti_dof.dof_type = dt_mode_to_dft(S_IFREG);
-
- rc = dt_declare_create(env, o, &dti->dti_attr, NULL,
- &dti->dti_dof, th);
- if (rc)
- GOTO(out_trans, rc);
-
- rc = dt_declare_record_write(env, o, sizeof(lastid), 0, th);
- if (rc)
- GOTO(out_trans, rc);
-
- rc = dt_trans_start_local(env, dev, th);
- if (rc)
- GOTO(out_trans, rc);
-
- dt_write_lock(env, o, 0);
- if (dt_object_exists(o))
- GOTO(out_lock, rc = 0);
-
- rc = dt_create(env, o, &dti->dti_attr, NULL, &dti->dti_dof,
- th);
- if (rc)
- GOTO(out_lock, rc);
-
- lastid = cpu_to_le64(first_oid);
-
- dti->dti_off = 0;
- dti->dti_lb.lb_buf = &lastid;
- dti->dti_lb.lb_len = sizeof(lastid);
- rc = dt_record_write(env, o, &dti->dti_lb, &dti->dti_off, th);
- if (rc)
- GOTO(out_lock, rc);
-out_lock:
- dt_write_unlock(env, o);
-out_trans:
- dt_trans_stop(env, dev, th);
- } else {
- dti->dti_off = 0;
- dti->dti_lb.lb_buf = &lastid;
- dti->dti_lb.lb_len = sizeof(lastid);
- dt_read_lock(env, o, 0);
- rc = dt_record_read(env, o, &dti->dti_lb, &dti->dti_off);
- dt_read_unlock(env, o);
- if (rc == 0 && le64_to_cpu(lastid) > OBIF_MAX_OID) {
- CERROR("%s: bad oid %llu is read from LAST_ID\n",
- o->do_lu.lo_dev->ld_obd->obd_name,
- le64_to_cpu(lastid));
- rc = -EINVAL;
- }
- }
-out_los:
- if (rc != 0) {
- list_del(&(*los)->los_list);
- atomic_dec(&ls->ls_refcount);
- OBD_FREE_PTR(*los);
- *los = NULL;
- if (o != NULL && !IS_ERR(o))
- lu_object_put_nocache(env, &o->do_lu);
- } else {
- (*los)->los_seq = fid_seq(first_fid);
- (*los)->los_last_oid = le64_to_cpu(lastid);
- (*los)->los_obj = o;
- /* Read value should not be less than initial one
- * but possible after upgrade from older fs.
- * In this case just switch to the first_oid in memory and
- * it will be updated on disk with first object generated */
- if ((*los)->los_last_oid < first_oid)
- (*los)->los_last_oid = first_oid;
- }
-out:
- mutex_unlock(&ls->ls_los_mutex);
- ls_device_put(env, ls);
- return rc;
-}
-EXPORT_SYMBOL(local_oid_storage_init);
-
-void local_oid_storage_fini(const struct lu_env *env,
- struct local_oid_storage *los)
-{
- struct ls_device *ls;
-
- if (!atomic_dec_and_test(&los->los_refcount))
- return;
-
- LASSERT(env);
- LASSERT(los->los_dev);
- ls = dt2ls_dev(los->los_dev);
-
- mutex_lock(&ls->ls_los_mutex);
- if (atomic_read(&los->los_refcount) == 0) {
- if (los->los_obj)
- lu_object_put_nocache(env, &los->los_obj->do_lu);
- list_del(&los->los_list);
- OBD_FREE_PTR(los);
- }
- mutex_unlock(&ls->ls_los_mutex);
- ls_device_put(env, ls);
-}
-EXPORT_SYMBOL(local_oid_storage_fini);
projects / cascardo / linux.git / commitdiff