journal.c 42.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * journal.c
 *
 * Defines functions of journalling api
 *
 * Copyright (C) 2003, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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 for more details.
 *
 * 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 021110-1307, USA.
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/kthread.h>

#define MLOG_MASK_PREFIX ML_JOURNAL
#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "namei.h"
#include "slot_map.h"
#include "super.h"
#include "vote.h"
#include "sysfile.h"

#include "buffer_head_io.h"

spinlock_t trans_inc_lock = SPIN_LOCK_UNLOCKED;

static int ocfs2_force_read_journal(struct inode *inode);
static int ocfs2_recover_node(struct ocfs2_super *osb,
			      int node_num);
static int __ocfs2_recovery_thread(void *arg);
static int ocfs2_commit_cache(struct ocfs2_super *osb);
static int ocfs2_wait_on_mount(struct ocfs2_super *osb);
static void ocfs2_handle_cleanup_locks(struct ocfs2_journal *journal,
				       struct ocfs2_journal_handle *handle);
static void ocfs2_commit_unstarted_handle(struct ocfs2_journal_handle *handle);
static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
				      int dirty);
static int ocfs2_trylock_journal(struct ocfs2_super *osb,
				 int slot_num);
static int ocfs2_recover_orphans(struct ocfs2_super *osb,
				 int slot);
static int ocfs2_commit_thread(void *arg);

static int ocfs2_commit_cache(struct ocfs2_super *osb)
{
	int status = 0;
	unsigned int flushed;
	unsigned long old_id;
	struct ocfs2_journal *journal = NULL;

	mlog_entry_void();

	journal = osb->journal;

	/* Flush all pending commits and checkpoint the journal. */
	down_write(&journal->j_trans_barrier);

	if (atomic_read(&journal->j_num_trans) == 0) {
		up_write(&journal->j_trans_barrier);
		mlog(0, "No transactions for me to flush!\n");
		goto finally;
	}

	journal_lock_updates(journal->j_journal);
	status = journal_flush(journal->j_journal);
	journal_unlock_updates(journal->j_journal);
	if (status < 0) {
		up_write(&journal->j_trans_barrier);
		mlog_errno(status);
		goto finally;
	}

	old_id = ocfs2_inc_trans_id(journal);

	flushed = atomic_read(&journal->j_num_trans);
	atomic_set(&journal->j_num_trans, 0);
	up_write(&journal->j_trans_barrier);

	mlog(0, "commit_thread: flushed transaction %lu (%u handles)\n",
	     journal->j_trans_id, flushed);

	ocfs2_kick_vote_thread(osb);
	wake_up(&journal->j_checkpointed);
finally:
	mlog_exit(status);
	return status;
}

struct ocfs2_journal_handle *ocfs2_alloc_handle(struct ocfs2_super *osb)
{
	struct ocfs2_journal_handle *retval = NULL;

120
	retval = kcalloc(1, sizeof(*retval), GFP_NOFS);
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
	if (!retval) {
		mlog(ML_ERROR, "Failed to allocate memory for journal "
		     "handle!\n");
		return NULL;
	}

	retval->max_buffs = 0;
	retval->num_locks = 0;
	retval->k_handle = NULL;

	INIT_LIST_HEAD(&retval->locks);
	INIT_LIST_HEAD(&retval->inode_list);
	retval->journal = osb->journal;

	return retval;
}

/* pass it NULL and it will allocate a new handle object for you.  If
 * you pass it a handle however, it may still return error, in which
 * case it has free'd the passed handle for you. */
struct ocfs2_journal_handle *ocfs2_start_trans(struct ocfs2_super *osb,
					       struct ocfs2_journal_handle *handle,
					       int max_buffs)
{
	int ret;
	journal_t *journal = osb->journal->j_journal;

	mlog_entry("(max_buffs = %d)\n", max_buffs);

150
	BUG_ON(!osb || !osb->journal->j_journal);
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217

	if (ocfs2_is_hard_readonly(osb)) {
		ret = -EROFS;
		goto done_free;
	}

	BUG_ON(osb->journal->j_state == OCFS2_JOURNAL_FREE);
	BUG_ON(max_buffs <= 0);

	/* JBD might support this, but our journalling code doesn't yet. */
	if (journal_current_handle()) {
		mlog(ML_ERROR, "Recursive transaction attempted!\n");
		BUG();
	}

	if (!handle)
		handle = ocfs2_alloc_handle(osb);
	if (!handle) {
		ret = -ENOMEM;
		mlog(ML_ERROR, "Failed to allocate memory for journal "
		     "handle!\n");
		goto done_free;
	}

	handle->max_buffs = max_buffs;

	down_read(&osb->journal->j_trans_barrier);

	/* actually start the transaction now */
	handle->k_handle = journal_start(journal, max_buffs);
	if (IS_ERR(handle->k_handle)) {
		up_read(&osb->journal->j_trans_barrier);

		ret = PTR_ERR(handle->k_handle);
		handle->k_handle = NULL;
		mlog_errno(ret);

		if (is_journal_aborted(journal)) {
			ocfs2_abort(osb->sb, "Detected aborted journal");
			ret = -EROFS;
		}
		goto done_free;
	}

	atomic_inc(&(osb->journal->j_num_trans));
	handle->flags |= OCFS2_HANDLE_STARTED;

	mlog_exit_ptr(handle);
	return handle;

done_free:
	if (handle)
		ocfs2_commit_unstarted_handle(handle); /* will kfree handle */

	mlog_exit(ret);
	return ERR_PTR(ret);
}

void ocfs2_handle_add_inode(struct ocfs2_journal_handle *handle,
			    struct inode *inode)
{
	BUG_ON(!handle);
	BUG_ON(!inode);

	atomic_inc(&inode->i_count);

	/* we're obviously changing it... */
218
	mutex_lock(&inode->i_mutex);
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242

	/* sanity check */
	BUG_ON(OCFS2_I(inode)->ip_handle);
	BUG_ON(!list_empty(&OCFS2_I(inode)->ip_handle_list));

	OCFS2_I(inode)->ip_handle = handle;
	list_del(&(OCFS2_I(inode)->ip_handle_list));
	list_add_tail(&(OCFS2_I(inode)->ip_handle_list), &(handle->inode_list));
}

static void ocfs2_handle_unlock_inodes(struct ocfs2_journal_handle *handle)
{
	struct list_head *p, *n;
	struct inode *inode;
	struct ocfs2_inode_info *oi;

	list_for_each_safe(p, n, &handle->inode_list) {
		oi = list_entry(p, struct ocfs2_inode_info,
				ip_handle_list);
		inode = &oi->vfs_inode;

		OCFS2_I(inode)->ip_handle = NULL;
		list_del_init(&OCFS2_I(inode)->ip_handle_list);

243
		mutex_unlock(&inode->i_mutex);
244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379
		iput(inode);
	}
}

/* This is trivial so we do it out of the main commit
 * paths. Beware, it can be called from start_trans too! */
static void ocfs2_commit_unstarted_handle(struct ocfs2_journal_handle *handle)
{
	mlog_entry_void();

	BUG_ON(handle->flags & OCFS2_HANDLE_STARTED);

	ocfs2_handle_unlock_inodes(handle);
	/* You are allowed to add journal locks before the transaction
	 * has started. */
	ocfs2_handle_cleanup_locks(handle->journal, handle);

	kfree(handle);

	mlog_exit_void();
}

void ocfs2_commit_trans(struct ocfs2_journal_handle *handle)
{
	handle_t *jbd_handle;
	int retval;
	struct ocfs2_journal *journal = handle->journal;

	mlog_entry_void();

	BUG_ON(!handle);

	if (!(handle->flags & OCFS2_HANDLE_STARTED)) {
		ocfs2_commit_unstarted_handle(handle);
		mlog_exit_void();
		return;
	}

	/* release inode semaphores we took during this transaction */
	ocfs2_handle_unlock_inodes(handle);

	/* ocfs2_extend_trans may have had to call journal_restart
	 * which will always commit the transaction, but may return
	 * error for any number of reasons. If this is the case, we
	 * clear k_handle as it's not valid any more. */
	if (handle->k_handle) {
		jbd_handle = handle->k_handle;

		if (handle->flags & OCFS2_HANDLE_SYNC)
			jbd_handle->h_sync = 1;
		else
			jbd_handle->h_sync = 0;

		/* actually stop the transaction. if we've set h_sync,
		 * it'll have been committed when we return */
		retval = journal_stop(jbd_handle);
		if (retval < 0) {
			mlog_errno(retval);
			mlog(ML_ERROR, "Could not commit transaction\n");
			BUG();
		}

		handle->k_handle = NULL; /* it's been free'd in journal_stop */
	}

	ocfs2_handle_cleanup_locks(journal, handle);

	up_read(&journal->j_trans_barrier);

	kfree(handle);
	mlog_exit_void();
}

/*
 * 'nblocks' is what you want to add to the current
 * transaction. extend_trans will either extend the current handle by
 * nblocks, or commit it and start a new one with nblocks credits.
 *
 * WARNING: This will not release any semaphores or disk locks taken
 * during the transaction, so make sure they were taken *before*
 * start_trans or we'll have ordering deadlocks.
 *
 * WARNING2: Note that we do *not* drop j_trans_barrier here. This is
 * good because transaction ids haven't yet been recorded on the
 * cluster locks associated with this handle.
 */
int ocfs2_extend_trans(struct ocfs2_journal_handle *handle,
		       int nblocks)
{
	int status;

	BUG_ON(!handle);
	BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED));
	BUG_ON(!nblocks);

	mlog_entry_void();

	mlog(0, "Trying to extend transaction by %d blocks\n", nblocks);

	status = journal_extend(handle->k_handle, nblocks);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	if (status > 0) {
		mlog(0, "journal_extend failed, trying journal_restart\n");
		status = journal_restart(handle->k_handle, nblocks);
		if (status < 0) {
			handle->k_handle = NULL;
			mlog_errno(status);
			goto bail;
		}
		handle->max_buffs = nblocks;
	} else
		handle->max_buffs += nblocks;

	status = 0;
bail:

	mlog_exit(status);
	return status;
}

int ocfs2_journal_access(struct ocfs2_journal_handle *handle,
			 struct inode *inode,
			 struct buffer_head *bh,
			 int type)
{
	int status;

	BUG_ON(!inode);
	BUG_ON(!handle);
	BUG_ON(!bh);
	BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED));

380
	mlog_entry("bh->b_blocknr=%llu, type=%d (\"%s\"), bh->b_size = %zu\n",
381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402
		   (unsigned long long)bh->b_blocknr, type,
		   (type == OCFS2_JOURNAL_ACCESS_CREATE) ?
		   "OCFS2_JOURNAL_ACCESS_CREATE" :
		   "OCFS2_JOURNAL_ACCESS_WRITE",
		   bh->b_size);

	/* we can safely remove this assertion after testing. */
	if (!buffer_uptodate(bh)) {
		mlog(ML_ERROR, "giving me a buffer that's not uptodate!\n");
		mlog(ML_ERROR, "b_blocknr=%llu\n",
		     (unsigned long long)bh->b_blocknr);
		BUG();
	}

	/* Set the current transaction information on the inode so
	 * that the locking code knows whether it can drop it's locks
	 * on this inode or not. We're protected from the commit
	 * thread updating the current transaction id until
	 * ocfs2_commit_trans() because ocfs2_start_trans() took
	 * j_trans_barrier for us. */
	ocfs2_set_inode_lock_trans(OCFS2_SB(inode->i_sb)->journal, inode);

M
Mark Fasheh 已提交
403
	mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
404 405 406 407 408 409 410 411 412 413 414 415 416 417
	switch (type) {
	case OCFS2_JOURNAL_ACCESS_CREATE:
	case OCFS2_JOURNAL_ACCESS_WRITE:
		status = journal_get_write_access(handle->k_handle, bh);
		break;

	case OCFS2_JOURNAL_ACCESS_UNDO:
		status = journal_get_undo_access(handle->k_handle, bh);
		break;

	default:
		status = -EINVAL;
		mlog(ML_ERROR, "Uknown access type!\n");
	}
M
Mark Fasheh 已提交
418
	mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505

	if (status < 0)
		mlog(ML_ERROR, "Error %d getting %d access to buffer!\n",
		     status, type);

	mlog_exit(status);
	return status;
}

int ocfs2_journal_dirty(struct ocfs2_journal_handle *handle,
			struct buffer_head *bh)
{
	int status;

	BUG_ON(!(handle->flags & OCFS2_HANDLE_STARTED));

	mlog_entry("(bh->b_blocknr=%llu)\n",
		   (unsigned long long)bh->b_blocknr);

	status = journal_dirty_metadata(handle->k_handle, bh);
	if (status < 0)
		mlog(ML_ERROR, "Could not dirty metadata buffer. "
		     "(bh->b_blocknr=%llu)\n",
		     (unsigned long long)bh->b_blocknr);

	mlog_exit(status);
	return status;
}

int ocfs2_journal_dirty_data(handle_t *handle,
			     struct buffer_head *bh)
{
	int err = journal_dirty_data(handle, bh);
	if (err)
		mlog_errno(err);
	/* TODO: When we can handle it, abort the handle and go RO on
	 * error here. */

	return err;
}

/* We always assume you're adding a metadata lock at level 'ex' */
int ocfs2_handle_add_lock(struct ocfs2_journal_handle *handle,
			  struct inode *inode)
{
	int status;
	struct ocfs2_journal_lock *lock;

	BUG_ON(!inode);

	lock = kmem_cache_alloc(ocfs2_lock_cache, GFP_NOFS);
	if (!lock) {
		status = -ENOMEM;
		mlog_errno(-ENOMEM);
		goto bail;
	}

	if (!igrab(inode))
		BUG();
	lock->jl_inode = inode;

	list_add_tail(&(lock->jl_lock_list), &(handle->locks));
	handle->num_locks++;

	status = 0;
bail:
	mlog_exit(status);
	return status;
}

static void ocfs2_handle_cleanup_locks(struct ocfs2_journal *journal,
				       struct ocfs2_journal_handle *handle)
{
	struct list_head *p, *n;
	struct ocfs2_journal_lock *lock;
	struct inode *inode;

	list_for_each_safe(p, n, &(handle->locks)) {
		lock = list_entry(p, struct ocfs2_journal_lock,
				  jl_lock_list);
		list_del(&lock->jl_lock_list);
		handle->num_locks--;

		inode = lock->jl_inode;
		ocfs2_meta_unlock(inode, 1);
		if (atomic_read(&inode->i_count) == 1)
			mlog(ML_ERROR,
506 507
			     "Inode %llu, I'm doing a last iput for!",
			     (unsigned long long)OCFS2_I(inode)->ip_blkno);
508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562
		iput(inode);
		kmem_cache_free(ocfs2_lock_cache, lock);
	}
}

#define OCFS2_DEFAULT_COMMIT_INTERVAL 	(HZ * 5)

void ocfs2_set_journal_params(struct ocfs2_super *osb)
{
	journal_t *journal = osb->journal->j_journal;

	spin_lock(&journal->j_state_lock);
	journal->j_commit_interval = OCFS2_DEFAULT_COMMIT_INTERVAL;
	if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
		journal->j_flags |= JFS_BARRIER;
	else
		journal->j_flags &= ~JFS_BARRIER;
	spin_unlock(&journal->j_state_lock);
}

int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)
{
	int status = -1;
	struct inode *inode = NULL; /* the journal inode */
	journal_t *j_journal = NULL;
	struct ocfs2_dinode *di = NULL;
	struct buffer_head *bh = NULL;
	struct ocfs2_super *osb;
	int meta_lock = 0;

	mlog_entry_void();

	BUG_ON(!journal);

	osb = journal->j_osb;

	/* already have the inode for our journal */
	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
					    osb->slot_num);
	if (inode == NULL) {
		status = -EACCES;
		mlog_errno(status);
		goto done;
	}
	if (is_bad_inode(inode)) {
		mlog(ML_ERROR, "access error (bad inode)\n");
		iput(inode);
		inode = NULL;
		status = -EACCES;
		goto done;
	}

	SET_INODE_JOURNAL(inode);
	OCFS2_I(inode)->ip_open_count++;

563 564 565 566 567
	/* Skip recovery waits here - journal inode metadata never
	 * changes in a live cluster so it can be considered an
	 * exception to the rule. */
	status = ocfs2_meta_lock_full(inode, NULL, &bh, 1,
				      OCFS2_META_LOCK_RECOVERY);
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584
	if (status < 0) {
		if (status != -ERESTARTSYS)
			mlog(ML_ERROR, "Could not get lock on journal!\n");
		goto done;
	}

	meta_lock = 1;
	di = (struct ocfs2_dinode *)bh->b_data;

	if (inode->i_size <  OCFS2_MIN_JOURNAL_SIZE) {
		mlog(ML_ERROR, "Journal file size (%lld) is too small!\n",
		     inode->i_size);
		status = -EINVAL;
		goto done;
	}

	mlog(0, "inode->i_size = %lld\n", inode->i_size);
585 586
	mlog(0, "inode->i_blocks = %llu\n",
			(unsigned long long)inode->i_blocks);
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
	mlog(0, "inode->ip_clusters = %u\n", OCFS2_I(inode)->ip_clusters);

	/* call the kernels journal init function now */
	j_journal = journal_init_inode(inode);
	if (j_journal == NULL) {
		mlog(ML_ERROR, "Linux journal layer error\n");
		status = -EINVAL;
		goto done;
	}

	mlog(0, "Returned from journal_init_inode\n");
	mlog(0, "j_journal->j_maxlen = %u\n", j_journal->j_maxlen);

	*dirty = (le32_to_cpu(di->id1.journal1.ij_flags) &
		  OCFS2_JOURNAL_DIRTY_FL);

	journal->j_journal = j_journal;
	journal->j_inode = inode;
	journal->j_bh = bh;

	ocfs2_set_journal_params(osb);

	journal->j_state = OCFS2_JOURNAL_LOADED;

	status = 0;
done:
	if (status < 0) {
		if (meta_lock)
			ocfs2_meta_unlock(inode, 1);
		if (bh != NULL)
			brelse(bh);
		if (inode) {
			OCFS2_I(inode)->ip_open_count--;
			iput(inode);
		}
	}

	mlog_exit(status);
	return status;
}

static int ocfs2_journal_toggle_dirty(struct ocfs2_super *osb,
				      int dirty)
{
	int status;
	unsigned int flags;
	struct ocfs2_journal *journal = osb->journal;
	struct buffer_head *bh = journal->j_bh;
	struct ocfs2_dinode *fe;

	mlog_entry_void();

	fe = (struct ocfs2_dinode *)bh->b_data;
	if (!OCFS2_IS_VALID_DINODE(fe)) {
		/* This is called from startup/shutdown which will
		 * handle the errors in a specific manner, so no need
		 * to call ocfs2_error() here. */
644 645 646
		mlog(ML_ERROR, "Journal dinode %llu  has invalid "
		     "signature: %.*s", (unsigned long long)fe->i_blkno, 7,
		     fe->i_signature);
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
		status = -EIO;
		goto out;
	}

	flags = le32_to_cpu(fe->id1.journal1.ij_flags);
	if (dirty)
		flags |= OCFS2_JOURNAL_DIRTY_FL;
	else
		flags &= ~OCFS2_JOURNAL_DIRTY_FL;
	fe->id1.journal1.ij_flags = cpu_to_le32(flags);

	status = ocfs2_write_block(osb, bh, journal->j_inode);
	if (status < 0)
		mlog_errno(status);

out:
	mlog_exit(status);
	return status;
}

/*
 * If the journal has been kmalloc'd it needs to be freed after this
 * call.
 */
void ocfs2_journal_shutdown(struct ocfs2_super *osb)
{
	struct ocfs2_journal *journal = NULL;
	int status = 0;
	struct inode *inode = NULL;
	int num_running_trans = 0;

	mlog_entry_void();

680
	BUG_ON(!osb);
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811

	journal = osb->journal;
	if (!journal)
		goto done;

	inode = journal->j_inode;

	if (journal->j_state != OCFS2_JOURNAL_LOADED)
		goto done;

	/* need to inc inode use count as journal_destroy will iput. */
	if (!igrab(inode))
		BUG();

	num_running_trans = atomic_read(&(osb->journal->j_num_trans));
	if (num_running_trans > 0)
		mlog(0, "Shutting down journal: must wait on %d "
		     "running transactions!\n",
		     num_running_trans);

	/* Do a commit_cache here. It will flush our journal, *and*
	 * release any locks that are still held.
	 * set the SHUTDOWN flag and release the trans lock.
	 * the commit thread will take the trans lock for us below. */
	journal->j_state = OCFS2_JOURNAL_IN_SHUTDOWN;

	/* The OCFS2_JOURNAL_IN_SHUTDOWN will signal to commit_cache to not
	 * drop the trans_lock (which we want to hold until we
	 * completely destroy the journal. */
	if (osb->commit_task) {
		/* Wait for the commit thread */
		mlog(0, "Waiting for ocfs2commit to exit....\n");
		kthread_stop(osb->commit_task);
		osb->commit_task = NULL;
	}

	BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0);

	status = ocfs2_journal_toggle_dirty(osb, 0);
	if (status < 0)
		mlog_errno(status);

	/* Shutdown the kernel journal system */
	journal_destroy(journal->j_journal);

	OCFS2_I(inode)->ip_open_count--;

	/* unlock our journal */
	ocfs2_meta_unlock(inode, 1);

	brelse(journal->j_bh);
	journal->j_bh = NULL;

	journal->j_state = OCFS2_JOURNAL_FREE;

//	up_write(&journal->j_trans_barrier);
done:
	if (inode)
		iput(inode);
	mlog_exit_void();
}

static void ocfs2_clear_journal_error(struct super_block *sb,
				      journal_t *journal,
				      int slot)
{
	int olderr;

	olderr = journal_errno(journal);
	if (olderr) {
		mlog(ML_ERROR, "File system error %d recorded in "
		     "journal %u.\n", olderr, slot);
		mlog(ML_ERROR, "File system on device %s needs checking.\n",
		     sb->s_id);

		journal_ack_err(journal);
		journal_clear_err(journal);
	}
}

int ocfs2_journal_load(struct ocfs2_journal *journal)
{
	int status = 0;
	struct ocfs2_super *osb;

	mlog_entry_void();

	if (!journal)
		BUG();

	osb = journal->j_osb;

	status = journal_load(journal->j_journal);
	if (status < 0) {
		mlog(ML_ERROR, "Failed to load journal!\n");
		goto done;
	}

	ocfs2_clear_journal_error(osb->sb, journal->j_journal, osb->slot_num);

	status = ocfs2_journal_toggle_dirty(osb, 1);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	/* Launch the commit thread */
	osb->commit_task = kthread_run(ocfs2_commit_thread, osb, "ocfs2cmt-%d",
				       osb->osb_id);
	if (IS_ERR(osb->commit_task)) {
		status = PTR_ERR(osb->commit_task);
		osb->commit_task = NULL;
		mlog(ML_ERROR, "unable to launch ocfs2commit thread, error=%d",
		     status);
		goto done;
	}

done:
	mlog_exit(status);
	return status;
}


/* 'full' flag tells us whether we clear out all blocks or if we just
 * mark the journal clean */
int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full)
{
	int status;

	mlog_entry_void();

812
	BUG_ON(!journal);
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853

	status = journal_wipe(journal->j_journal, full);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = ocfs2_journal_toggle_dirty(journal->j_osb, 0);
	if (status < 0)
		mlog_errno(status);

bail:
	mlog_exit(status);
	return status;
}

/*
 * JBD Might read a cached version of another nodes journal file. We
 * don't want this as this file changes often and we get no
 * notification on those changes. The only way to be sure that we've
 * got the most up to date version of those blocks then is to force
 * read them off disk. Just searching through the buffer cache won't
 * work as there may be pages backing this file which are still marked
 * up to date. We know things can't change on this file underneath us
 * as we have the lock by now :)
 */
static int ocfs2_force_read_journal(struct inode *inode)
{
	int status = 0;
	int i, p_blocks;
	u64 v_blkno, p_blkno;
#define CONCURRENT_JOURNAL_FILL 32
	struct buffer_head *bhs[CONCURRENT_JOURNAL_FILL];

	mlog_entry_void();

	BUG_ON(inode->i_blocks !=
		     ocfs2_align_bytes_to_sectors(i_size_read(inode)));

	memset(bhs, 0, sizeof(struct buffer_head *) * CONCURRENT_JOURNAL_FILL);

854 855 856
	mlog(0, "Force reading %llu blocks\n",
		(unsigned long long)(inode->i_blocks >>
			(inode->i_sb->s_blocksize_bits - 9)));
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872

	v_blkno = 0;
	while (v_blkno <
	       (inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9))) {

		status = ocfs2_extent_map_get_blocks(inode, v_blkno,
						     1, &p_blkno,
						     &p_blocks);
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}

		if (p_blocks > CONCURRENT_JOURNAL_FILL)
			p_blocks = CONCURRENT_JOURNAL_FILL;

873 874
		/* We are reading journal data which should not
		 * be put in the uptodate cache */
875 876
		status = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
					   p_blkno, p_blocks, bhs, 0,
877
					   NULL);
878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
		if (status < 0) {
			mlog_errno(status);
			goto bail;
		}

		for(i = 0; i < p_blocks; i++) {
			brelse(bhs[i]);
			bhs[i] = NULL;
		}

		v_blkno += p_blocks;
	}

bail:
	for(i = 0; i < CONCURRENT_JOURNAL_FILL; i++)
		if (bhs[i])
			brelse(bhs[i]);
	mlog_exit(status);
	return status;
}

struct ocfs2_la_recovery_item {
	struct list_head	lri_list;
	int			lri_slot;
	struct ocfs2_dinode	*lri_la_dinode;
	struct ocfs2_dinode	*lri_tl_dinode;
};

/* Does the second half of the recovery process. By this point, the
 * node is marked clean and can actually be considered recovered,
 * hence it's no longer in the recovery map, but there's still some
 * cleanup we can do which shouldn't happen within the recovery thread
 * as locking in that context becomes very difficult if we are to take
 * recovering nodes into account.
 *
 * NOTE: This function can and will sleep on recovery of other nodes
 * during cluster locking, just like any other ocfs2 process.
 */
void ocfs2_complete_recovery(void *data)
{
	int ret;
	struct ocfs2_super *osb = data;
	struct ocfs2_journal *journal = osb->journal;
	struct ocfs2_dinode *la_dinode, *tl_dinode;
	struct ocfs2_la_recovery_item *item;
	struct list_head *p, *n;
	LIST_HEAD(tmp_la_list);

	mlog_entry_void();

	mlog(0, "completing recovery from keventd\n");

	spin_lock(&journal->j_lock);
	list_splice_init(&journal->j_la_cleanups, &tmp_la_list);
	spin_unlock(&journal->j_lock);

	list_for_each_safe(p, n, &tmp_la_list) {
		item = list_entry(p, struct ocfs2_la_recovery_item, lri_list);
		list_del_init(&item->lri_list);

		mlog(0, "Complete recovery for slot %d\n", item->lri_slot);

		la_dinode = item->lri_la_dinode;
		if (la_dinode) {
942 943
			mlog(0, "Clean up local alloc %llu\n",
			     (unsigned long long)la_dinode->i_blkno);
944 945 946 947 948 949 950 951 952 953 954

			ret = ocfs2_complete_local_alloc_recovery(osb,
								  la_dinode);
			if (ret < 0)
				mlog_errno(ret);

			kfree(la_dinode);
		}

		tl_dinode = item->lri_tl_dinode;
		if (tl_dinode) {
955 956
			mlog(0, "Clean up truncate log %llu\n",
			     (unsigned long long)tl_dinode->i_blkno);
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986

			ret = ocfs2_complete_truncate_log_recovery(osb,
								   tl_dinode);
			if (ret < 0)
				mlog_errno(ret);

			kfree(tl_dinode);
		}

		ret = ocfs2_recover_orphans(osb, item->lri_slot);
		if (ret < 0)
			mlog_errno(ret);

		kfree(item);
	}

	mlog(0, "Recovery completion\n");
	mlog_exit_void();
}

/* NOTE: This function always eats your references to la_dinode and
 * tl_dinode, either manually on error, or by passing them to
 * ocfs2_complete_recovery */
static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
					    int slot_num,
					    struct ocfs2_dinode *la_dinode,
					    struct ocfs2_dinode *tl_dinode)
{
	struct ocfs2_la_recovery_item *item;

987
	item = kmalloc(sizeof(struct ocfs2_la_recovery_item), GFP_NOFS);
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
	if (!item) {
		/* Though we wish to avoid it, we are in fact safe in
		 * skipping local alloc cleanup as fsck.ocfs2 is more
		 * than capable of reclaiming unused space. */
		if (la_dinode)
			kfree(la_dinode);

		if (tl_dinode)
			kfree(tl_dinode);

		mlog_errno(-ENOMEM);
		return;
	}

	INIT_LIST_HEAD(&item->lri_list);
	item->lri_la_dinode = la_dinode;
	item->lri_slot = slot_num;
	item->lri_tl_dinode = tl_dinode;

	spin_lock(&journal->j_lock);
	list_add_tail(&item->lri_list, &journal->j_la_cleanups);
	queue_work(ocfs2_wq, &journal->j_recovery_work);
	spin_unlock(&journal->j_lock);
}

/* Called by the mount code to queue recovery the last part of
 * recovery for it's own slot. */
void ocfs2_complete_mount_recovery(struct ocfs2_super *osb)
{
	struct ocfs2_journal *journal = osb->journal;

	if (osb->dirty) {
		/* No need to queue up our truncate_log as regular
		 * cleanup will catch that. */
		ocfs2_queue_recovery_completion(journal,
						osb->slot_num,
						osb->local_alloc_copy,
						NULL);
		ocfs2_schedule_truncate_log_flush(osb, 0);

		osb->local_alloc_copy = NULL;
		osb->dirty = 0;
	}
}

static int __ocfs2_recovery_thread(void *arg)
{
	int status, node_num;
	struct ocfs2_super *osb = arg;

	mlog_entry_void();

	status = ocfs2_wait_on_mount(osb);
	if (status < 0) {
		goto bail;
	}

restart:
	status = ocfs2_super_lock(osb, 1);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	while(!ocfs2_node_map_is_empty(osb, &osb->recovery_map)) {
		node_num = ocfs2_node_map_first_set_bit(osb,
							&osb->recovery_map);
		if (node_num == O2NM_INVALID_NODE_NUM) {
			mlog(0, "Out of nodes to recover.\n");
			break;
		}

		status = ocfs2_recover_node(osb, node_num);
		if (status < 0) {
			mlog(ML_ERROR,
			     "Error %d recovering node %d on device (%u,%u)!\n",
			     status, node_num,
			     MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
			mlog(ML_ERROR, "Volume requires unmount.\n");
			continue;
		}

		ocfs2_recovery_map_clear(osb, node_num);
	}
	ocfs2_super_unlock(osb, 1);

	/* We always run recovery on our own orphan dir - the dead
	 * node(s) may have voted "no" on an inode delete earlier. A
	 * revote is therefore required. */
	ocfs2_queue_recovery_completion(osb->journal, osb->slot_num, NULL,
					NULL);

bail:
1081
	mutex_lock(&osb->recovery_lock);
1082 1083
	if (!status &&
	    !ocfs2_node_map_is_empty(osb, &osb->recovery_map)) {
1084
		mutex_unlock(&osb->recovery_lock);
1085 1086 1087 1088 1089 1090 1091
		goto restart;
	}

	osb->recovery_thread_task = NULL;
	mb(); /* sync with ocfs2_recovery_thread_running */
	wake_up(&osb->recovery_event);

1092
	mutex_unlock(&osb->recovery_lock);
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106

	mlog_exit(status);
	/* no one is callint kthread_stop() for us so the kthread() api
	 * requires that we call do_exit().  And it isn't exported, but
	 * complete_and_exit() seems to be a minimal wrapper around it. */
	complete_and_exit(NULL, status);
	return status;
}

void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num)
{
	mlog_entry("(node_num=%d, osb->node_num = %d)\n",
		   node_num, osb->node_num);

1107
	mutex_lock(&osb->recovery_lock);
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
	if (osb->disable_recovery)
		goto out;

	/* People waiting on recovery will wait on
	 * the recovery map to empty. */
	if (!ocfs2_recovery_map_set(osb, node_num))
		mlog(0, "node %d already be in recovery.\n", node_num);

	mlog(0, "starting recovery thread...\n");

	if (osb->recovery_thread_task)
		goto out;

	osb->recovery_thread_task =  kthread_run(__ocfs2_recovery_thread, osb,
						 "ocfs2rec-%d", osb->osb_id);
	if (IS_ERR(osb->recovery_thread_task)) {
		mlog_errno((int)PTR_ERR(osb->recovery_thread_task));
		osb->recovery_thread_task = NULL;
	}

out:
1129
	mutex_unlock(&osb->recovery_lock);
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
	wake_up(&osb->recovery_event);

	mlog_exit_void();
}

/* Does the actual journal replay and marks the journal inode as
 * clean. Will only replay if the journal inode is marked dirty. */
static int ocfs2_replay_journal(struct ocfs2_super *osb,
				int node_num,
				int slot_num)
{
	int status;
	int got_lock = 0;
	unsigned int flags;
	struct inode *inode = NULL;
	struct ocfs2_dinode *fe;
	journal_t *journal = NULL;
	struct buffer_head *bh = NULL;

	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
					    slot_num);
	if (inode == NULL) {
		status = -EACCES;
		mlog_errno(status);
		goto done;
	}
	if (is_bad_inode(inode)) {
		status = -EACCES;
		iput(inode);
		inode = NULL;
		mlog_errno(status);
		goto done;
	}
	SET_INODE_JOURNAL(inode);

	status = ocfs2_meta_lock_full(inode, NULL, &bh, 1,
				      OCFS2_META_LOCK_RECOVERY);
	if (status < 0) {
		mlog(0, "status returned from ocfs2_meta_lock=%d\n", status);
		if (status != -ERESTARTSYS)
			mlog(ML_ERROR, "Could not lock journal!\n");
		goto done;
	}
	got_lock = 1;

	fe = (struct ocfs2_dinode *) bh->b_data;

	flags = le32_to_cpu(fe->id1.journal1.ij_flags);

	if (!(flags & OCFS2_JOURNAL_DIRTY_FL)) {
		mlog(0, "No recovery required for node %d\n", node_num);
		goto done;
	}

	mlog(ML_NOTICE, "Recovering node %d from slot %d on device (%u,%u)\n",
	     node_num, slot_num,
	     MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));

	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);

	status = ocfs2_force_read_journal(inode);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	mlog(0, "calling journal_init_inode\n");
	journal = journal_init_inode(inode);
	if (journal == NULL) {
		mlog(ML_ERROR, "Linux journal layer error\n");
		status = -EIO;
		goto done;
	}

	status = journal_load(journal);
	if (status < 0) {
		mlog_errno(status);
		if (!igrab(inode))
			BUG();
		journal_destroy(journal);
		goto done;
	}

	ocfs2_clear_journal_error(osb->sb, journal, slot_num);

	/* wipe the journal */
	mlog(0, "flushing the journal.\n");
	journal_lock_updates(journal);
	status = journal_flush(journal);
	journal_unlock_updates(journal);
	if (status < 0)
		mlog_errno(status);

	/* This will mark the node clean */
	flags = le32_to_cpu(fe->id1.journal1.ij_flags);
	flags &= ~OCFS2_JOURNAL_DIRTY_FL;
	fe->id1.journal1.ij_flags = cpu_to_le32(flags);

	status = ocfs2_write_block(osb, bh, inode);
	if (status < 0)
		mlog_errno(status);

	if (!igrab(inode))
		BUG();

	journal_destroy(journal);

done:
	/* drop the lock on this nodes journal */
	if (got_lock)
		ocfs2_meta_unlock(inode, 1);

	if (inode)
		iput(inode);

	if (bh)
		brelse(bh);

	mlog_exit(status);
	return status;
}

/*
 * Do the most important parts of node recovery:
 *  - Replay it's journal
 *  - Stamp a clean local allocator file
 *  - Stamp a clean truncate log
 *  - Mark the node clean
 *
 * If this function completes without error, a node in OCFS2 can be
 * said to have been safely recovered. As a result, failure during the
 * second part of a nodes recovery process (local alloc recovery) is
 * far less concerning.
 */
static int ocfs2_recover_node(struct ocfs2_super *osb,
			      int node_num)
{
	int status = 0;
	int slot_num;
	struct ocfs2_slot_info *si = osb->slot_info;
	struct ocfs2_dinode *la_copy = NULL;
	struct ocfs2_dinode *tl_copy = NULL;

	mlog_entry("(node_num=%d, osb->node_num = %d)\n",
		   node_num, osb->node_num);

	mlog(0, "checking node %d\n", node_num);

	/* Should not ever be called to recover ourselves -- in that
	 * case we should've called ocfs2_journal_load instead. */
1280
	BUG_ON(osb->node_num == node_num);
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415

	slot_num = ocfs2_node_num_to_slot(si, node_num);
	if (slot_num == OCFS2_INVALID_SLOT) {
		status = 0;
		mlog(0, "no slot for this node, so no recovery required.\n");
		goto done;
	}

	mlog(0, "node %d was using slot %d\n", node_num, slot_num);

	status = ocfs2_replay_journal(osb, node_num, slot_num);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	/* Stamp a clean local alloc file AFTER recovering the journal... */
	status = ocfs2_begin_local_alloc_recovery(osb, slot_num, &la_copy);
	if (status < 0) {
		mlog_errno(status);
		goto done;
	}

	/* An error from begin_truncate_log_recovery is not
	 * serious enough to warrant halting the rest of
	 * recovery. */
	status = ocfs2_begin_truncate_log_recovery(osb, slot_num, &tl_copy);
	if (status < 0)
		mlog_errno(status);

	/* Likewise, this would be a strange but ultimately not so
	 * harmful place to get an error... */
	ocfs2_clear_slot(si, slot_num);
	status = ocfs2_update_disk_slots(osb, si);
	if (status < 0)
		mlog_errno(status);

	/* This will kfree the memory pointed to by la_copy and tl_copy */
	ocfs2_queue_recovery_completion(osb->journal, slot_num, la_copy,
					tl_copy);

	status = 0;
done:

	mlog_exit(status);
	return status;
}

/* Test node liveness by trylocking his journal. If we get the lock,
 * we drop it here. Return 0 if we got the lock, -EAGAIN if node is
 * still alive (we couldn't get the lock) and < 0 on error. */
static int ocfs2_trylock_journal(struct ocfs2_super *osb,
				 int slot_num)
{
	int status, flags;
	struct inode *inode = NULL;

	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
					    slot_num);
	if (inode == NULL) {
		mlog(ML_ERROR, "access error\n");
		status = -EACCES;
		goto bail;
	}
	if (is_bad_inode(inode)) {
		mlog(ML_ERROR, "access error (bad inode)\n");
		iput(inode);
		inode = NULL;
		status = -EACCES;
		goto bail;
	}
	SET_INODE_JOURNAL(inode);

	flags = OCFS2_META_LOCK_RECOVERY | OCFS2_META_LOCK_NOQUEUE;
	status = ocfs2_meta_lock_full(inode, NULL, NULL, 1, flags);
	if (status < 0) {
		if (status != -EAGAIN)
			mlog_errno(status);
		goto bail;
	}

	ocfs2_meta_unlock(inode, 1);
bail:
	if (inode)
		iput(inode);

	return status;
}

/* Call this underneath ocfs2_super_lock. It also assumes that the
 * slot info struct has been updated from disk. */
int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
{
	int status, i, node_num;
	struct ocfs2_slot_info *si = osb->slot_info;

	/* This is called with the super block cluster lock, so we
	 * know that the slot map can't change underneath us. */

	spin_lock(&si->si_lock);
	for(i = 0; i < si->si_num_slots; i++) {
		if (i == osb->slot_num)
			continue;
		if (ocfs2_is_empty_slot(si, i))
			continue;

		node_num = si->si_global_node_nums[i];
		if (ocfs2_node_map_test_bit(osb, &osb->recovery_map, node_num))
			continue;
		spin_unlock(&si->si_lock);

		/* Ok, we have a slot occupied by another node which
		 * is not in the recovery map. We trylock his journal
		 * file here to test if he's alive. */
		status = ocfs2_trylock_journal(osb, i);
		if (!status) {
			/* Since we're called from mount, we know that
			 * the recovery thread can't race us on
			 * setting / checking the recovery bits. */
			ocfs2_recovery_thread(osb, node_num);
		} else if ((status < 0) && (status != -EAGAIN)) {
			mlog_errno(status);
			goto bail;
		}

		spin_lock(&si->si_lock);
	}
	spin_unlock(&si->si_lock);

	status = 0;
bail:
	mlog_exit(status);
	return status;
}

1416 1417 1418
static int ocfs2_queue_orphans(struct ocfs2_super *osb,
			       int slot,
			       struct inode **head)
1419
{
1420
	int status;
1421
	struct inode *orphan_dir_inode = NULL;
1422
	struct inode *iter;
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433
	unsigned long offset, blk, local;
	struct buffer_head *bh = NULL;
	struct ocfs2_dir_entry *de;
	struct super_block *sb = osb->sb;

	orphan_dir_inode = ocfs2_get_system_file_inode(osb,
						       ORPHAN_DIR_SYSTEM_INODE,
						       slot);
	if  (!orphan_dir_inode) {
		status = -ENOENT;
		mlog_errno(status);
1434 1435
		return status;
	}	
1436

1437
	mutex_lock(&orphan_dir_inode->i_mutex);
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
	status = ocfs2_meta_lock(orphan_dir_inode, NULL, NULL, 0);
	if (status < 0) {
		mlog_errno(status);
		goto out;
	}

	offset = 0;
	iter = NULL;
	while(offset < i_size_read(orphan_dir_inode)) {
		blk = offset >> sb->s_blocksize_bits;

		bh = ocfs2_bread(orphan_dir_inode, blk, &status, 0);
		if (!bh)
			status = -EINVAL;
		if (status < 0) {
			if (bh)
				brelse(bh);
			mlog_errno(status);
1456
			goto out_unlock;
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
		}

		local = 0;
		while(offset < i_size_read(orphan_dir_inode)
		      && local < sb->s_blocksize) {
			de = (struct ocfs2_dir_entry *) (bh->b_data + local);

			if (!ocfs2_check_dir_entry(orphan_dir_inode,
						  de, bh, local)) {
				status = -EINVAL;
				mlog_errno(status);
				brelse(bh);
1469
				goto out_unlock;
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
			}

			local += le16_to_cpu(de->rec_len);
			offset += le16_to_cpu(de->rec_len);

			/* I guess we silently fail on no inode? */
			if (!le64_to_cpu(de->inode))
				continue;
			if (de->file_type > OCFS2_FT_MAX) {
				mlog(ML_ERROR,
				     "block %llu contains invalid de: "
1481
				     "inode = %llu, rec_len = %u, "
1482 1483 1484
				     "name_len = %u, file_type = %u, "
				     "name='%.*s'\n",
				     (unsigned long long)bh->b_blocknr,
1485
				     (unsigned long long)le64_to_cpu(de->inode),
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
				     le16_to_cpu(de->rec_len),
				     de->name_len,
				     de->file_type,
				     de->name_len,
				     de->name);
				continue;
			}
			if (de->name_len == 1 && !strncmp(".", de->name, 1))
				continue;
			if (de->name_len == 2 && !strncmp("..", de->name, 2))
				continue;

			iter = ocfs2_iget(osb, le64_to_cpu(de->inode));
			if (IS_ERR(iter))
				continue;

1502 1503
			mlog(0, "queue orphan %llu\n",
			     (unsigned long long)OCFS2_I(iter)->ip_blkno);
1504 1505 1506 1507 1508
			/* No locking is required for the next_orphan
			 * queue as there is only ever a single
			 * process doing orphan recovery. */
			OCFS2_I(iter)->ip_next_orphan = *head;
			*head = iter;
1509 1510 1511 1512
		}
		brelse(bh);
	}

1513
out_unlock:
1514
	ocfs2_meta_unlock(orphan_dir_inode, 0);
1515 1516
out:
	mutex_unlock(&orphan_dir_inode->i_mutex);
1517
	iput(orphan_dir_inode);
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
	return status;
}

static int ocfs2_orphan_recovery_can_continue(struct ocfs2_super *osb,
					      int slot)
{
	int ret;

	spin_lock(&osb->osb_lock);
	ret = !osb->osb_orphan_wipes[slot];
	spin_unlock(&osb->osb_lock);
	return ret;
}

static void ocfs2_mark_recovering_orphan_dir(struct ocfs2_super *osb,
					     int slot)
{
	spin_lock(&osb->osb_lock);
	/* Mark ourselves such that new processes in delete_inode()
	 * know to quit early. */
	ocfs2_node_map_set_bit(osb, &osb->osb_recovering_orphan_dirs, slot);
	while (osb->osb_orphan_wipes[slot]) {
		/* If any processes are already in the middle of an
		 * orphan wipe on this dir, then we need to wait for
		 * them. */
		spin_unlock(&osb->osb_lock);
		wait_event_interruptible(osb->osb_wipe_event,
					 ocfs2_orphan_recovery_can_continue(osb, slot));
		spin_lock(&osb->osb_lock);
	}
	spin_unlock(&osb->osb_lock);
}

static void ocfs2_clear_recovering_orphan_dir(struct ocfs2_super *osb,
					      int slot)
{
	ocfs2_node_map_clear_bit(osb, &osb->osb_recovering_orphan_dirs, slot);
}

/*
 * Orphan recovery. Each mounted node has it's own orphan dir which we
 * must run during recovery. Our strategy here is to build a list of
 * the inodes in the orphan dir and iget/iput them. The VFS does
 * (most) of the rest of the work.
 *
 * Orphan recovery can happen at any time, not just mount so we have a
 * couple of extra considerations.
 *
 * - We grab as many inodes as we can under the orphan dir lock -
 *   doing iget() outside the orphan dir risks getting a reference on
 *   an invalid inode.
 * - We must be sure not to deadlock with other processes on the
 *   system wanting to run delete_inode(). This can happen when they go
 *   to lock the orphan dir and the orphan recovery process attempts to
 *   iget() inside the orphan dir lock. This can be avoided by
 *   advertising our state to ocfs2_delete_inode().
 */
static int ocfs2_recover_orphans(struct ocfs2_super *osb,
				 int slot)
{
	int ret = 0;
	struct inode *inode = NULL;
	struct inode *iter;
	struct ocfs2_inode_info *oi;

	mlog(0, "Recover inodes from orphan dir in slot %d\n", slot);

	ocfs2_mark_recovering_orphan_dir(osb, slot);
	ret = ocfs2_queue_orphans(osb, slot, &inode);
	ocfs2_clear_recovering_orphan_dir(osb, slot);

	/* Error here should be noted, but we want to continue with as
	 * many queued inodes as we've got. */
	if (ret)
		mlog_errno(ret);
1593 1594 1595

	while (inode) {
		oi = OCFS2_I(inode);
1596
		mlog(0, "iput orphan %llu\n", (unsigned long long)oi->ip_blkno);
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617

		iter = oi->ip_next_orphan;

		spin_lock(&oi->ip_lock);
		/* Delete voting may have set these on the assumption
		 * that the other node would wipe them successfully.
		 * If they are still in the node's orphan dir, we need
		 * to reset that state. */
		oi->ip_flags &= ~(OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE);

		/* Set the proper information to get us going into
		 * ocfs2_delete_inode. */
		oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
		oi->ip_orphaned_slot = slot;
		spin_unlock(&oi->ip_lock);

		iput(inode);

		inode = iter;
	}

1618
	return ret;
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
}

static int ocfs2_wait_on_mount(struct ocfs2_super *osb)
{
	/* This check is good because ocfs2 will wait on our recovery
	 * thread before changing it to something other than MOUNTED
	 * or DISABLED. */
	wait_event(osb->osb_mount_event,
		   atomic_read(&osb->vol_state) == VOLUME_MOUNTED ||
		   atomic_read(&osb->vol_state) == VOLUME_DISABLED);

	/* If there's an error on mount, then we may never get to the
	 * MOUNTED flag, but this is set right before
	 * dismount_volume() so we can trust it. */
	if (atomic_read(&osb->vol_state) == VOLUME_DISABLED) {
		mlog(0, "mount error, exiting!\n");
		return -EBUSY;
	}

	return 0;
}

static int ocfs2_commit_thread(void *arg)
{
	int status;
	struct ocfs2_super *osb = arg;
	struct ocfs2_journal *journal = osb->journal;

	/* we can trust j_num_trans here because _should_stop() is only set in
	 * shutdown and nobody other than ourselves should be able to start
	 * transactions.  committing on shutdown might take a few iterations
	 * as final transactions put deleted inodes on the list */
	while (!(kthread_should_stop() &&
		 atomic_read(&journal->j_num_trans) == 0)) {

1654 1655 1656
		wait_event_interruptible(osb->checkpoint_event,
					 atomic_read(&journal->j_num_trans)
					 || kthread_should_stop());
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718

		status = ocfs2_commit_cache(osb);
		if (status < 0)
			mlog_errno(status);

		if (kthread_should_stop() && atomic_read(&journal->j_num_trans)){
			mlog(ML_KTHREAD,
			     "commit_thread: %u transactions pending on "
			     "shutdown\n",
			     atomic_read(&journal->j_num_trans));
		}
	}

	return 0;
}

/* Look for a dirty journal without taking any cluster locks. Used for
 * hard readonly access to determine whether the file system journals
 * require recovery. */
int ocfs2_check_journals_nolocks(struct ocfs2_super *osb)
{
	int ret = 0;
	unsigned int slot;
	struct buffer_head *di_bh;
	struct ocfs2_dinode *di;
	struct inode *journal = NULL;

	for(slot = 0; slot < osb->max_slots; slot++) {
		journal = ocfs2_get_system_file_inode(osb,
						      JOURNAL_SYSTEM_INODE,
						      slot);
		if (!journal || is_bad_inode(journal)) {
			ret = -EACCES;
			mlog_errno(ret);
			goto out;
		}

		di_bh = NULL;
		ret = ocfs2_read_block(osb, OCFS2_I(journal)->ip_blkno, &di_bh,
				       0, journal);
		if (ret < 0) {
			mlog_errno(ret);
			goto out;
		}

		di = (struct ocfs2_dinode *) di_bh->b_data;

		if (le32_to_cpu(di->id1.journal1.ij_flags) &
		    OCFS2_JOURNAL_DIRTY_FL)
			ret = -EROFS;

		brelse(di_bh);
		if (ret)
			break;
	}

out:
	if (journal)
		iput(journal);

	return ret;
}