drivers/staging/lustre/lustre/llite/llite_close.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/llite/llite_close.c
  37  *
  38  * Lustre Lite routines to issue a secondary close after writeback
  39  */
  40
  41 #include <linux/module.h>
  42
  43 #define DEBUG_SUBSYSTEM S_LLITE
  44
  45 #include "../include/lustre_lite.h"
  46 #include "llite_internal.h"
  47
  48 /** records that a write is in flight */
  49 void vvp_write_pending(struct ccc_object *club, struct ccc_page *page)
  50 {
  51         struct ll_inode_info *lli = ll_i2info(club->cob_inode);
  52
  53         spin_lock(&lli->lli_lock);
  54         lli->lli_flags |= LLIF_SOM_DIRTY;
  55         if (page != NULL && list_empty(&page->cpg_pending_linkage))
  56                 list_add(&page->cpg_pending_linkage,
  57                              &club->cob_pending_list);
  58         spin_unlock(&lli->lli_lock);
  59 }
  60
  61 /** records that a write has completed */
  62 void vvp_write_complete(struct ccc_object *club, struct ccc_page *page)
  63 {
  64         struct ll_inode_info *lli = ll_i2info(club->cob_inode);
  65         int rc = 0;
  66
  67         spin_lock(&lli->lli_lock);
  68         if (page != NULL && !list_empty(&page->cpg_pending_linkage)) {
  69                 list_del_init(&page->cpg_pending_linkage);
  70                 rc = 1;
  71         }
  72         spin_unlock(&lli->lli_lock);
  73         if (rc)
  74                 ll_queue_done_writing(club->cob_inode, 0);
  75 }
  76
  77 /** Queues DONE_WRITING if
  78  * - done writing is allowed;
  79  * - inode has no no dirty pages; */
  80 void ll_queue_done_writing(struct inode *inode, unsigned long flags)
  81 {
  82         struct ll_inode_info *lli = ll_i2info(inode);
  83         struct ccc_object *club = cl2ccc(ll_i2info(inode)->lli_clob);
  84
  85         spin_lock(&lli->lli_lock);
  86         lli->lli_flags |= flags;
  87
  88         if ((lli->lli_flags & LLIF_DONE_WRITING) &&
  89             list_empty(&club->cob_pending_list)) {
  90                 struct ll_close_queue *lcq = ll_i2sbi(inode)->ll_lcq;
  91
  92                 if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
  93                         CWARN("ino %lu/%u(flags %u) som valid it just after recovery\n",
  94                               inode->i_ino, inode->i_generation,
  95                               lli->lli_flags);
  96                 /* DONE_WRITING is allowed and inode has no dirty page. */
  97                 spin_lock(&lcq->lcq_lock);
  98
  99                 LASSERT(list_empty(&lli->lli_close_list));
 100                 CDEBUG(D_INODE, "adding inode %lu/%u to close list\n",
 101                        inode->i_ino, inode->i_generation);
 102                 list_add_tail(&lli->lli_close_list, &lcq->lcq_head);
 103
 104                 /* Avoid a concurrent insertion into the close thread queue:
 105                  * an inode is already in the close thread, open(), write(),
 106                  * close() happen, epoch is closed as the inode is marked as
 107                  * LLIF_EPOCH_PENDING. When pages are written inode should not
 108                  * be inserted into the queue again, clear this flag to avoid
 109                  * it. */
 110                 lli->lli_flags &= ~LLIF_DONE_WRITING;
 111
 112                 wake_up(&lcq->lcq_waitq);
 113                 spin_unlock(&lcq->lcq_lock);
 114         }
 115         spin_unlock(&lli->lli_lock);
 116 }
 117
 118 /** Pack SOM attributes info @opdata for CLOSE, DONE_WRITING rpc. */
 119 void ll_done_writing_attr(struct inode *inode, struct md_op_data *op_data)
 120 {
 121         struct ll_inode_info *lli = ll_i2info(inode);
 122
 123         op_data->op_flags |= MF_SOM_CHANGE;
 124         /* Check if Size-on-MDS attributes are valid. */
 125         if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
 126                 CERROR("ino %lu/%u(flags %u) som valid it just after recovery\n",
 127                        inode->i_ino, inode->i_generation,
 128                        lli->lli_flags);
 129
 130         if (!cl_local_size(inode)) {
 131                 /* Send Size-on-MDS Attributes if valid. */
 132                 op_data->op_attr.ia_valid |= ATTR_MTIME_SET | ATTR_CTIME_SET |
 133                                 ATTR_ATIME_SET | ATTR_SIZE | ATTR_BLOCKS;
 134         }
 135 }
 136
 137 /** Closes ioepoch and packs Size-on-MDS attribute if needed into @op_data. */
 138 void ll_ioepoch_close(struct inode *inode, struct md_op_data *op_data,
 139                       struct obd_client_handle **och, unsigned long flags)
 140 {
 141         struct ll_inode_info *lli = ll_i2info(inode);
 142         struct ccc_object *club = cl2ccc(ll_i2info(inode)->lli_clob);
 143
 144         spin_lock(&lli->lli_lock);
 145         if (!(list_empty(&club->cob_pending_list))) {
 146                 if (!(lli->lli_flags & LLIF_EPOCH_PENDING)) {
 147                         LASSERT(*och != NULL);
 148                         LASSERT(lli->lli_pending_och == NULL);
 149                         /* Inode is dirty and there is no pending write done
 150                          * request yet, DONE_WRITE is to be sent later. */
 151                         lli->lli_flags |= LLIF_EPOCH_PENDING;
 152                         lli->lli_pending_och = *och;
 153                         spin_unlock(&lli->lli_lock);
 154
 155                         inode = igrab(inode);
 156                         LASSERT(inode);
 157                         goto out;
 158                 }
 159                 if (flags & LLIF_DONE_WRITING) {
 160                         /* Some pages are still dirty, it is early to send
 161                          * DONE_WRITE. Wait until all pages will be flushed
 162                          * and try DONE_WRITE again later. */
 163                         LASSERT(!(lli->lli_flags & LLIF_DONE_WRITING));
 164                         lli->lli_flags |= LLIF_DONE_WRITING;
 165                         spin_unlock(&lli->lli_lock);
 166
 167                         inode = igrab(inode);
 168                         LASSERT(inode);
 169                         goto out;
 170                 }
 171         }
 172         CDEBUG(D_INODE, "Epoch %llu closed on "DFID"\n",
 173                ll_i2info(inode)->lli_ioepoch, PFID(&lli->lli_fid));
 174         op_data->op_flags |= MF_EPOCH_CLOSE;
 175
 176         if (flags & LLIF_DONE_WRITING) {
 177                 LASSERT(lli->lli_flags & LLIF_SOM_DIRTY);
 178                 LASSERT(!(lli->lli_flags & LLIF_DONE_WRITING));
 179                 *och = lli->lli_pending_och;
 180                 lli->lli_pending_och = NULL;
 181                 lli->lli_flags &= ~LLIF_EPOCH_PENDING;
 182         } else {
 183                 /* Pack Size-on-MDS inode attributes only if they has changed */
 184                 if (!(lli->lli_flags & LLIF_SOM_DIRTY)) {
 185                         spin_unlock(&lli->lli_lock);
 186                         goto out;
 187                 }
 188
 189                 /* There is a pending DONE_WRITE -- close epoch with no
 190                  * attribute change. */
 191                 if (lli->lli_flags & LLIF_EPOCH_PENDING) {
 192                         spin_unlock(&lli->lli_lock);
 193                         goto out;
 194                 }
 195         }
 196
 197         LASSERT(list_empty(&club->cob_pending_list));
 198         lli->lli_flags &= ~LLIF_SOM_DIRTY;
 199         spin_unlock(&lli->lli_lock);
 200         ll_done_writing_attr(inode, op_data);
 201
 202 out:
 203         return;
 204 }
 205
 206 /**
 207  * Cliens updates SOM attributes on MDS (including llog cookies):
 208  * obd_getattr with no lock and md_setattr.
 209  */
 210 int ll_som_update(struct inode *inode, struct md_op_data *op_data)
 211 {
 212         struct ll_inode_info *lli = ll_i2info(inode);
 213         struct ptlrpc_request *request = NULL;
 214         __u32 old_flags;
 215         struct obdo *oa;
 216         int rc;
 217
 218         LASSERT(op_data != NULL);
 219         if (lli->lli_flags & LLIF_MDS_SIZE_LOCK)
 220                 CERROR("ino %lu/%u(flags %u) som valid it just after recovery\n",
 221                        inode->i_ino, inode->i_generation,
 222                        lli->lli_flags);
 223
 224         oa = kmem_cache_alloc(obdo_cachep, GFP_NOFS | __GFP_ZERO);
 225         if (!oa) {
 226                 CERROR("can't allocate memory for Size-on-MDS update.\n");
 227                 return -ENOMEM;
 228         }
 229
 230         old_flags = op_data->op_flags;
 231         op_data->op_flags = MF_SOM_CHANGE;
 232
 233         /* If inode is already in another epoch, skip getattr from OSTs. */
 234         if (lli->lli_ioepoch == op_data->op_ioepoch) {
 235                 rc = ll_inode_getattr(inode, oa, op_data->op_ioepoch,
 236                                       old_flags & MF_GETATTR_LOCK);
 237                 if (rc) {
 238                         oa->o_valid = 0;
 239                         if (rc != -ENOENT)
 240                                 CERROR("inode_getattr failed (%d): unable to send a Size-on-MDS attribute update for inode %lu/%u\n",
 241                                        rc, inode->i_ino,
 242                                        inode->i_generation);
 243                 } else {
 244                         CDEBUG(D_INODE, "Size-on-MDS update on "DFID"\n",
 245                                PFID(&lli->lli_fid));
 246                 }
 247                 /* Install attributes into op_data. */
 248                 md_from_obdo(op_data, oa, oa->o_valid);
 249         }
 250
 251         rc = md_setattr(ll_i2sbi(inode)->ll_md_exp, op_data,
 252                         NULL, 0, NULL, 0, &request, NULL);
 253         ptlrpc_req_finished(request);
 254
 255         kmem_cache_free(obdo_cachep, oa);
 256         return rc;
 257 }
 258
 259 /**
 260  * Closes the ioepoch and packs all the attributes into @op_data for
 261  * DONE_WRITING rpc.
 262  */
 263 static void ll_prepare_done_writing(struct inode *inode,
 264                                     struct md_op_data *op_data,
 265                                     struct obd_client_handle **och)
 266 {
 267         ll_ioepoch_close(inode, op_data, och, LLIF_DONE_WRITING);
 268         /* If there is no @och, we do not do D_W yet. */
 269         if (*och == NULL)
 270                 return;
 271
 272         ll_pack_inode2opdata(inode, op_data, &(*och)->och_fh);
 273         ll_prep_md_op_data(op_data, inode, NULL, NULL,
 274                            0, 0, LUSTRE_OPC_ANY, NULL);
 275 }
 276
 277 /** Send a DONE_WRITING rpc. */
 278 static void ll_done_writing(struct inode *inode)
 279 {
 280         struct obd_client_handle *och = NULL;
 281         struct md_op_data *op_data;
 282         int rc;
 283
 284         LASSERT(exp_connect_som(ll_i2mdexp(inode)));
 285
 286         op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
 287         if (!op_data)
 288                 return;
 289
 290         ll_prepare_done_writing(inode, op_data, &och);
 291         /* If there is no @och, we do not do D_W yet. */
 292         if (och == NULL)
 293                 goto out;
 294
 295         rc = md_done_writing(ll_i2sbi(inode)->ll_md_exp, op_data, NULL);
 296         if (rc == -EAGAIN)
 297                 /* MDS has instructed us to obtain Size-on-MDS attribute from
 298                  * OSTs and send setattr to back to MDS. */
 299                 rc = ll_som_update(inode, op_data);
 300         else if (rc)
 301                 CERROR("inode %lu mdc done_writing failed: rc = %d\n",
 302                        inode->i_ino, rc);
 303 out:
 304         ll_finish_md_op_data(op_data);
 305         if (och) {
 306                 md_clear_open_replay_data(ll_i2sbi(inode)->ll_md_exp, och);
 307                 kfree(och);
 308         }
 309 }
 310
 311 static struct ll_inode_info *ll_close_next_lli(struct ll_close_queue *lcq)
 312 {
 313         struct ll_inode_info *lli = NULL;
 314
 315         spin_lock(&lcq->lcq_lock);
 316
 317         if (!list_empty(&lcq->lcq_head)) {
 318                 lli = list_entry(lcq->lcq_head.next, struct ll_inode_info,
 319                                      lli_close_list);
 320                 list_del_init(&lli->lli_close_list);
 321         } else if (atomic_read(&lcq->lcq_stop))
 322                 lli = ERR_PTR(-EALREADY);
 323
 324         spin_unlock(&lcq->lcq_lock);
 325         return lli;
 326 }
 327
 328 static int ll_close_thread(void *arg)
 329 {
 330         struct ll_close_queue *lcq = arg;
 331
 332         complete(&lcq->lcq_comp);
 333
 334         while (1) {
 335                 struct l_wait_info lwi = { 0 };
 336                 struct ll_inode_info *lli;
 337                 struct inode *inode;
 338
 339                 l_wait_event_exclusive(lcq->lcq_waitq,
 340                                        (lli = ll_close_next_lli(lcq)) != NULL,
 341                                        &lwi);
 342                 if (IS_ERR(lli))
 343                         break;
 344
 345                 inode = ll_info2i(lli);
 346                 CDEBUG(D_INFO, "done_writing for inode %lu/%u\n",
 347                        inode->i_ino, inode->i_generation);
 348                 ll_done_writing(inode);
 349                 iput(inode);
 350         }
 351
 352         CDEBUG(D_INFO, "ll_close exiting\n");
 353         complete(&lcq->lcq_comp);
 354         return 0;
 355 }
 356
 357 int ll_close_thread_start(struct ll_close_queue **lcq_ret)
 358 {
 359         struct ll_close_queue *lcq;
 360         struct task_struct *task;
 361
 362         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CLOSE_THREAD))
 363                 return -EINTR;
 364
 365         lcq = kzalloc(sizeof(*lcq), GFP_NOFS);
 366         if (!lcq)
 367                 return -ENOMEM;
 368
 369         spin_lock_init(&lcq->lcq_lock);
 370         INIT_LIST_HEAD(&lcq->lcq_head);
 371         init_waitqueue_head(&lcq->lcq_waitq);
 372         init_completion(&lcq->lcq_comp);
 373
 374         task = kthread_run(ll_close_thread, lcq, "ll_close");
 375         if (IS_ERR(task)) {
 376                 kfree(lcq);
 377                 return PTR_ERR(task);
 378         }
 379
 380         wait_for_completion(&lcq->lcq_comp);
 381         *lcq_ret = lcq;
 382         return 0;
 383 }
 384
 385 void ll_close_thread_shutdown(struct ll_close_queue *lcq)
 386 {
 387         init_completion(&lcq->lcq_comp);
 388         atomic_inc(&lcq->lcq_stop);
 389         wake_up(&lcq->lcq_waitq);
 390         wait_for_completion(&lcq->lcq_comp);
 391         kfree(lcq);
 392 }