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36 * lustre/osp/osp_object.c
38 * Lustre OST Proxy Device
40 * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
41 * Author: Mikhail Pershin <mike.tappro@intel.com>
45 # define EXPORT_SYMTAB
47 #define DEBUG_SUBSYSTEM S_MDS
49 #include "osp_internal.h"
51 static __u64 osp_object_assign_id(const struct lu_env *env,
52 struct osp_device *d, struct osp_object *o)
54 struct osp_thread_info *osi = osp_env_info(env);
55 const struct lu_fid *f = lu_object_fid(&o->opo_obj.do_lu);
57 LASSERT(fid_is_zero(f));
58 LASSERT(o->opo_reserved);
61 /* assign fid to anonymous object */
62 osi->osi_oi.oi_id = osp_precreate_get_id(d);
63 osi->osi_oi.oi_seq = FID_SEQ_OST_MDT0;
64 fid_ostid_unpack(&osi->osi_fid, &osi->osi_oi, d->opd_index);
65 lu_object_assign_fid(env, &o->opo_obj.do_lu, &osi->osi_fid);
67 return osi->osi_oi.oi_id;
70 static int osp_declare_attr_set(const struct lu_env *env, struct dt_object *dt,
71 const struct lu_attr *attr, struct thandle *th)
73 struct osp_device *d = lu2osp_dev(dt->do_lu.lo_dev);
74 struct osp_object *o = dt2osp_obj(dt);
80 * Usually we don't allow server stack to manipulate size
81 * but there is a special case when striping is created
82 * late, after stripless file got truncated to non-zero.
84 * In this case we do the following:
86 * 1) grab id in declare - this can lead to leaked OST objects
87 * but we don't currently have proper mechanism and the only
88 * options we have are to do truncate RPC holding transaction
89 * open (very bad) or to grab id in declare at cost of leaked
90 * OST object in same very rare unfortunate case (just bad)
91 * notice 1.6-2.0 do assignment outside of running transaction
92 * all the time, meaning many more chances for leaked objects.
94 * 2) send synchronous truncate RPC with just assigned id
97 /* there are few places in MDD code still passing NULL
98 * XXX: to be fixed soon */
102 if (attr->la_valid & LA_SIZE && attr->la_size > 0) {
103 LASSERT(!dt_object_exists(dt));
104 osp_object_assign_id(env, d, o);
105 rc = osp_object_truncate(env, dt, attr->la_size);
111 /* no need in logging for new objects being created */
115 if (!(attr->la_valid & (LA_UID | LA_GID)))
119 * track all UID/GID changes via llog
121 rc = osp_sync_declare_add(env, o, MDS_SETATTR64_REC, th);
126 static int osp_attr_set(const struct lu_env *env, struct dt_object *dt,
127 const struct lu_attr *attr, struct thandle *th,
128 struct lustre_capa *capa)
130 struct osp_object *o = dt2osp_obj(dt);
135 /* we're interested in uid/gid changes only */
136 if (!(attr->la_valid & (LA_UID | LA_GID)))
139 /* new object, the very first ->attr_set()
140 * initializing attributes needs no logging
141 * all subsequent one are subject to the
142 * logging and synchronization with OST */
149 * once transaction is committed put proper command on
150 * the queue going to our OST
152 rc = osp_sync_add(env, o, MDS_SETATTR64_REC, th, attr);
154 /* XXX: send new uid/gid to OST ASAP? */
159 static int osp_declare_object_create(const struct lu_env *env,
160 struct dt_object *dt,
161 struct lu_attr *attr,
162 struct dt_allocation_hint *hint,
163 struct dt_object_format *dof,
166 struct osp_thread_info *osi = osp_env_info(env);
167 struct osp_device *d = lu2osp_dev(dt->do_lu.lo_dev);
168 struct osp_object *o = dt2osp_obj(dt);
169 const struct lu_fid *fid;
174 /* should happen to non-0 OSP only so that at least one object
175 * has been already declared in the scenario and LOD should
177 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OSC_CREATE_FAIL) && d->opd_index == 1)
180 LASSERT(d->opd_last_used_file);
181 fid = lu_object_fid(&dt->do_lu);
184 * There can be gaps in precreated ids and record to unlink llog
185 * XXX: we do not handle gaps yet, implemented before solution
186 * was found to be racy, so we disabled that. there is no
187 * point in making useless but expensive llog declaration.
189 /* rc = osp_sync_declare_add(env, o, MDS_UNLINK64_REC, th); */
191 if (unlikely(!fid_is_zero(fid))) {
192 /* replay case: caller knows fid */
193 osi->osi_off = sizeof(osi->osi_id) * d->opd_index;
194 rc = dt_declare_record_write(env, d->opd_last_used_file,
195 sizeof(osi->osi_id), osi->osi_off,
201 * in declaration we need to reserve object so that we don't block
202 * awaiting precreation RPC to complete
204 rc = osp_precreate_reserve(env, d);
206 * we also need to declare update to local "last used id" file for
207 * recovery if object isn't used for a reason, we need to release
208 * reservation, this can be made in osd_object_release()
211 /* mark id is reserved: in create we don't want to talk
213 LASSERT(o->opo_reserved == 0);
216 /* common for all OSPs file hystorically */
217 osi->osi_off = sizeof(osi->osi_id) * d->opd_index;
218 rc = dt_declare_record_write(env, d->opd_last_used_file,
219 sizeof(osi->osi_id), osi->osi_off,
222 /* not needed in the cache anymore */
223 set_bit(LU_OBJECT_HEARD_BANSHEE,
224 &dt->do_lu.lo_header->loh_flags);
229 static int osp_object_create(const struct lu_env *env, struct dt_object *dt,
230 struct lu_attr *attr,
231 struct dt_allocation_hint *hint,
232 struct dt_object_format *dof, struct thandle *th)
234 struct osp_thread_info *osi = osp_env_info(env);
235 struct osp_device *d = lu2osp_dev(dt->do_lu.lo_dev);
236 struct osp_object *o = dt2osp_obj(dt);
241 if (o->opo_reserved) {
242 /* regular case, id is assigned holding transaction open */
243 osi->osi_id = osp_object_assign_id(env, d, o);
245 /* special case, id was assigned outside of transaction
246 * see comments in osp_declare_attr_set */
247 rc = fid_ostid_pack(lu_object_fid(&dt->do_lu), &osi->osi_oi);
249 osi->osi_id = ostid_id(&osi->osi_oi);
250 spin_lock(&d->opd_pre_lock);
251 osp_update_last_id(d, osi->osi_id);
252 spin_unlock(&d->opd_pre_lock);
255 LASSERT(osi->osi_id);
258 * it's OK if the import is inactive by this moment - id was created
259 * by OST earlier, we just need to maintain it consistently on the disk
260 * once import is reconnected, OSP will claim this and other objects
261 * used and OST either keep them, if they exist or recreate
264 /* we might have lost precreated objects */
265 if (unlikely(d->opd_gap_count) > 0) {
266 spin_lock(&d->opd_pre_lock);
267 if (d->opd_gap_count > 0) {
268 int count = d->opd_gap_count;
270 osi->osi_oi.oi_id = d->opd_gap_start;
271 d->opd_gap_count = 0;
272 spin_unlock(&d->opd_pre_lock);
274 CDEBUG(D_HA, "Found gap "LPU64"+%d in objids\n",
275 d->opd_gap_start, count);
276 /* real gap handling is disabled intil ORI-692 will be
277 * fixed, now we only report gaps */
279 spin_unlock(&d->opd_pre_lock);
283 /* new object, the very first ->attr_set()
284 * initializing attributes needs no logging */
287 osp_objid_buf_prep(osi, d, d->opd_index);
288 rc = dt_record_write(env, d->opd_last_used_file, &osi->osi_lb,
291 CDEBUG(D_HA, "%s: Wrote last used ID: "LPU64": %d\n",
292 d->opd_obd->obd_name, le64_to_cpu(d->opd_last_used_id), rc);
297 static int osp_declare_object_destroy(const struct lu_env *env,
298 struct dt_object *dt, struct thandle *th)
300 struct osp_object *o = dt2osp_obj(dt);
306 * track objects to be destroyed via llog
308 rc = osp_sync_declare_add(env, o, MDS_UNLINK64_REC, th);
313 static int osp_object_destroy(const struct lu_env *env, struct dt_object *dt,
316 struct osp_object *o = dt2osp_obj(dt);
322 * once transaction is committed put proper command on
323 * the queue going to our OST
325 rc = osp_sync_add(env, o, MDS_UNLINK64_REC, th, NULL);
327 /* not needed in cache any more */
328 set_bit(LU_OBJECT_HEARD_BANSHEE, &dt->do_lu.lo_header->loh_flags);
333 struct dt_object_operations osp_obj_ops = {
334 .do_declare_attr_set = osp_declare_attr_set,
335 .do_attr_set = osp_attr_set,
336 .do_declare_create = osp_declare_object_create,
337 .do_create = osp_object_create,
338 .do_declare_destroy = osp_declare_object_destroy,
339 .do_destroy = osp_object_destroy,
342 static int osp_object_init(const struct lu_env *env, struct lu_object *o,
343 const struct lu_object_conf *unused)
345 struct osp_object *po = lu2osp_obj(o);
347 po->opo_obj.do_ops = &osp_obj_ops;
352 static void osp_object_free(const struct lu_env *env, struct lu_object *o)
354 struct osp_object *obj = lu2osp_obj(o);
355 struct lu_object_header *h = o->lo_header;
357 dt_object_fini(&obj->opo_obj);
358 lu_object_header_fini(h);
359 OBD_SLAB_FREE_PTR(obj, osp_object_kmem);
362 static void osp_object_release(const struct lu_env *env, struct lu_object *o)
364 struct osp_object *po = lu2osp_obj(o);
365 struct osp_device *d = lu2osp_dev(o->lo_dev);
370 * release reservation if object was declared but not created
371 * this may require lu_object_put() in LOD
373 if (unlikely(po->opo_reserved)) {
374 LASSERT(d->opd_pre_reserved > 0);
375 spin_lock(&d->opd_pre_lock);
376 d->opd_pre_reserved--;
377 spin_unlock(&d->opd_pre_lock);
379 /* not needed in cache any more */
380 set_bit(LU_OBJECT_HEARD_BANSHEE, &o->lo_header->loh_flags);
385 static int osp_object_print(const struct lu_env *env, void *cookie,
386 lu_printer_t p, const struct lu_object *l)
388 const struct osp_object *o = lu2osp_obj((struct lu_object *)l);
390 return (*p)(env, cookie, LUSTRE_OSP_NAME"-object@%p", o);
393 static int osp_object_invariant(const struct lu_object *o)
398 struct lu_object_operations osp_lu_obj_ops = {
399 .loo_object_init = osp_object_init,
400 .loo_object_free = osp_object_free,
401 .loo_object_release = osp_object_release,
402 .loo_object_print = osp_object_print,
403 .loo_object_invariant = osp_object_invariant