1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001-2003 Cluster File Systems, Inc.
5 * Author Peter Braam <braam@clusterfs.com>
7 * This file is part of Lustre, http://www.lustre.org.
9 * Lustre is free software; you can redistribute it and/or
10 * modify it under the terms of version 2 of the GNU General Public
11 * License as published by the Free Software Foundation.
13 * Lustre is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with Lustre; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * For testing and management it is treated as an obd_device,
23 * although * it does not export a full OBD method table (the
24 * requests are coming * in over the wire, so object target modules
25 * do not have a full * method table.)
30 # define EXPORT_SYMTAB
32 #define DEBUG_SUBSYSTEM S_OSC
35 # include <linux/version.h>
36 # include <linux/module.h>
37 # include <linux/mm.h>
38 # include <linux/highmem.h>
39 # include <linux/lustre_dlm.h>
40 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
41 # include <linux/workqueue.h>
42 # include <linux/smp_lock.h>
44 # include <linux/locks.h>
46 #else /* __KERNEL__ */
47 # include <liblustre.h>
51 # include <linux/ctype.h>
52 # include <linux/init.h>
57 #include <linux/obd_class.h>
58 #include "osc_internal.h"
60 static int osc_interpret_create(struct ptlrpc_request *req, void *data,
63 struct osc_creator *oscc;
64 struct ost_body *body = NULL;
68 body = lustre_swab_repbuf(req, 0, sizeof(*body),
69 lustre_swab_ost_body);
70 if (body == NULL && rc == 0)
74 oscc = req->rq_async_args.pointer_arg[0];
75 spin_lock(&oscc->oscc_lock);
77 oscc->oscc_last_id = body->oa.o_id;
79 DEBUG_REQ(D_INODE, req, "OST out of space, flagging");
80 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
81 } else if (rc != 0 && rc != -EIO) {
82 DEBUG_REQ(D_ERROR, req,
83 "unknown rc %d from async create: failing oscc",
85 ptlrpc_fail_import(req->rq_import, req->rq_import_generation);
87 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
88 spin_unlock(&oscc->oscc_lock);
90 CDEBUG(D_INFO, "preallocated through id "LPU64" (last used "LPU64")\n",
91 oscc->oscc_last_id, oscc->oscc_next_id);
93 wake_up(&oscc->oscc_waitq);
97 static int oscc_internal_create(struct osc_creator *oscc)
99 struct ptlrpc_request *request;
100 struct ost_body *body;
101 int size = sizeof(*body);
104 spin_lock(&oscc->oscc_lock);
105 if (oscc->oscc_flags & OSCC_FLAG_CREATING) {
106 spin_unlock(&oscc->oscc_lock);
109 oscc->oscc_flags |= OSCC_FLAG_CREATING;
110 spin_unlock(&oscc->oscc_lock);
112 request = ptlrpc_prep_req(class_exp2cliimp(oscc->oscc_exp), OST_CREATE,
114 if (request == NULL) {
115 spin_lock(&oscc->oscc_lock);
116 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
117 spin_unlock(&oscc->oscc_lock);
121 request->rq_request_portal = OST_CREATE_PORTAL; //XXX FIXME bug 249
122 body = lustre_msg_buf(request->rq_reqmsg, 0, sizeof(*body));
124 spin_lock(&oscc->oscc_lock);
125 body->oa.o_id = oscc->oscc_last_id + oscc->oscc_grow_count;
126 body->oa.o_valid |= OBD_MD_FLID;
127 CDEBUG(D_INFO, "preallocating through id "LPU64" (last used "LPU64")\n",
128 body->oa.o_id, oscc->oscc_next_id);
129 spin_unlock(&oscc->oscc_lock);
131 request->rq_replen = lustre_msg_size(1, &size);
133 request->rq_async_args.pointer_arg[0] = oscc;
134 request->rq_interpret_reply = osc_interpret_create;
135 ptlrpcd_add_req(request);
140 static int oscc_has_objects(struct osc_creator *oscc, int count)
143 spin_lock(&oscc->oscc_lock);
144 have_objs = ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
145 spin_unlock(&oscc->oscc_lock);
148 oscc_internal_create(oscc);
153 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
159 have_objs = oscc_has_objects(oscc, count);
161 spin_lock(&oscc->oscc_lock);
162 ost_full = (oscc->oscc_flags & OSCC_FLAG_NOSPC);
163 spin_unlock(&oscc->oscc_lock);
165 osc_invalid = class_exp2cliimp(oscc->oscc_exp)->imp_invalid;
167 return have_objs || ost_full || osc_invalid;
170 static int oscc_precreate(struct osc_creator *oscc, int wait)
172 struct l_wait_info lwi = { 0 };
176 if (oscc_has_objects(oscc, oscc->oscc_kick_barrier))
182 /* no rc check -- a no-INTR, no-TIMEOUT wait can't fail */
183 l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
185 if (!oscc_has_objects(oscc, 1) && (oscc->oscc_flags & OSCC_FLAG_NOSPC))
188 if (class_exp2cliimp(oscc->oscc_exp)->imp_invalid)
194 int osc_create(struct obd_export *exp, struct obdo *oa,
195 struct lov_stripe_md **ea, struct obd_trans_info *oti)
197 struct lov_stripe_md *lsm;
198 struct osc_creator *oscc = &exp->u.eu_osc_data.oed_oscc;
199 int try_again = 1, rc = 0;
204 if ((oa->o_valid & OBD_MD_FLGROUP) && (oa->o_gr != 0))
205 RETURN(osc_real_create(exp, oa, ea, oti));
209 rc = obd_alloc_memmd(exp, &lsm);
214 /* this is the special case where create removes orphans */
215 if ((oa->o_valid & OBD_MD_FLFLAGS) &&
216 oa->o_flags == OBD_FL_DELORPHAN) {
217 /* delete from next_id on up */
218 oa->o_valid |= OBD_MD_FLID;
219 oa->o_id = oscc->oscc_next_id - 1;
221 rc = osc_real_create(oscc->oscc_exp, oa, ea, NULL);
223 spin_lock(&oscc->oscc_lock);
225 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
226 oscc->oscc_last_id = oa->o_id;
227 spin_unlock(&oscc->oscc_lock);
233 spin_lock(&oscc->oscc_lock);
234 if (oscc->oscc_last_id >= oscc->oscc_next_id) {
235 memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
236 oa->o_id = oscc->oscc_next_id;
237 lsm->lsm_object_id = oscc->oscc_next_id;
239 oscc->oscc_next_id++;
241 } else if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
243 spin_unlock(&oscc->oscc_lock);
246 spin_unlock(&oscc->oscc_lock);
247 rc = oscc_precreate(oscc, try_again);
253 CDEBUG(D_INFO, "returning objid "LPU64"\n", lsm->lsm_object_id);
254 else if (*ea == NULL)
255 obd_free_memmd(exp, &lsm);
259 void oscc_init(struct obd_export *exp)
261 struct osc_export_data *oed;
266 oed = &exp->exp_osc_data;
267 memset(oed, 0, sizeof(*oed));
268 INIT_LIST_HEAD(&oed->oed_oscc.oscc_list);
269 init_waitqueue_head(&oed->oed_oscc.oscc_waitq);
270 spin_lock_init(&oed->oed_oscc.oscc_lock);
271 oed->oed_oscc.oscc_exp = exp;
272 oed->oed_oscc.oscc_kick_barrier = 100;
273 oed->oed_oscc.oscc_grow_count = 2000;
274 oed->oed_oscc.oscc_initial_create_count = 2000;
276 oed->oed_oscc.oscc_next_id = 2;
277 oed->oed_oscc.oscc_last_id = 1;
278 /* XXX the export handle should give the oscc the last object */
279 /* oed->oed_oscc.oscc_last_id = exph->....; */