brintos / linux-shallow public Read only

1// SPDX-License-Identifier: GPL-2.02/*3 * Write ahead logging implementation copyright Chris Mason 20004 *5 * The background commits make this code very interrelated, and6 * overly complex.  I need to rethink things a bit....The major players:7 *8 * journal_begin -- call with the number of blocks you expect to log.9 *                  If the current transaction is too10 *		    old, it will block until the current transaction is11 *		    finished, and then start a new one.12 *		    Usually, your transaction will get joined in with13 *                  previous ones for speed.14 *15 * journal_join  -- same as journal_begin, but won't block on the current16 *                  transaction regardless of age.  Don't ever call17 *                  this.  Ever.  There are only two places it should be18 *                  called from, and they are both inside this file.19 *20 * journal_mark_dirty -- adds blocks into this transaction.  clears any flags21 *                       that might make them get sent to disk22 *                       and then marks them BH_JDirty.  Puts the buffer head23 *                       into the current transaction hash.24 *25 * journal_end -- if the current transaction is batchable, it does nothing26 *                   otherwise, it could do an async/synchronous commit, or27 *                   a full flush of all log and real blocks in the28 *                   transaction.29 *30 * flush_old_commits -- if the current transaction is too old, it is ended and31 *                      commit blocks are sent to disk.  Forces commit blocks32 *                      to disk for all backgrounded commits that have been33 *                      around too long.34 *		     -- Note, if you call this as an immediate flush from35 *		        within kupdate, it will ignore the immediate flag36 */37 38#include <linux/time.h>39#include <linux/semaphore.h>40#include <linux/vmalloc.h>41#include "reiserfs.h"42#include <linux/kernel.h>43#include <linux/errno.h>44#include <linux/fcntl.h>45#include <linux/stat.h>46#include <linux/string.h>47#include <linux/buffer_head.h>48#include <linux/workqueue.h>49#include <linux/writeback.h>50#include <linux/blkdev.h>51#include <linux/backing-dev.h>52#include <linux/uaccess.h>53#include <linux/slab.h>54 55 56/* gets a struct reiserfs_journal_list * from a list head */57#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \58                               j_list))59 60/* must be correct to keep the desc and commit structs at 4k */61#define JOURNAL_TRANS_HALF 101862#define BUFNR 64		/*read ahead */63 64/* cnode stat bits.  Move these into reiserfs_fs.h */65 66/* this block was freed, and can't be written.  */67#define BLOCK_FREED 268/* this block was freed during this transaction, and can't be written */69#define BLOCK_FREED_HOLDER 370 71/* used in flush_journal_list */72#define BLOCK_NEEDS_FLUSH 473#define BLOCK_DIRTIED 574 75/* journal list state bits */76#define LIST_TOUCHED 177#define LIST_DIRTY   278#define LIST_COMMIT_PENDING  4	/* someone will commit this list */79 80/* flags for do_journal_end */81#define FLUSH_ALL   1		/* flush commit and real blocks */82#define COMMIT_NOW  2		/* end and commit this transaction */83#define WAIT        4		/* wait for the log blocks to hit the disk */84 85static int do_journal_end(struct reiserfs_transaction_handle *, int flags);86static int flush_journal_list(struct super_block *s,87			      struct reiserfs_journal_list *jl, int flushall);88static int flush_commit_list(struct super_block *s,89			     struct reiserfs_journal_list *jl, int flushall);90static int can_dirty(struct reiserfs_journal_cnode *cn);91static int journal_join(struct reiserfs_transaction_handle *th,92			struct super_block *sb);93static void release_journal_dev(struct reiserfs_journal *journal);94static void dirty_one_transaction(struct super_block *s,95				 struct reiserfs_journal_list *jl);96static void flush_async_commits(struct work_struct *work);97static void queue_log_writer(struct super_block *s);98 99/* values for join in do_journal_begin_r */100enum {101	JBEGIN_REG = 0,		/* regular journal begin */102	/* join the running transaction if at all possible */103	JBEGIN_JOIN = 1,104	/* called from cleanup code, ignores aborted flag */105	JBEGIN_ABORT = 2,106};107 108static int do_journal_begin_r(struct reiserfs_transaction_handle *th,109			      struct super_block *sb,110			      unsigned long nblocks, int join);111 112static void init_journal_hash(struct super_block *sb)113{114	struct reiserfs_journal *journal = SB_JOURNAL(sb);115	memset(journal->j_hash_table, 0,116	       JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));117}118 119/*120 * clears BH_Dirty and sticks the buffer on the clean list.  Called because121 * I can't allow refile_buffer to make schedule happen after I've freed a122 * block.  Look at remove_from_transaction and journal_mark_freed for123 * more details.124 */125static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)126{127	if (bh) {128		clear_buffer_dirty(bh);129		clear_buffer_journal_test(bh);130	}131	return 0;132}133 134static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block135							 *sb)136{137	struct reiserfs_bitmap_node *bn;138	static int id;139 140	bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);141	if (!bn) {142		return NULL;143	}144	bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);145	if (!bn->data) {146		kfree(bn);147		return NULL;148	}149	bn->id = id++;150	INIT_LIST_HEAD(&bn->list);151	return bn;152}153 154static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)155{156	struct reiserfs_journal *journal = SB_JOURNAL(sb);157	struct reiserfs_bitmap_node *bn = NULL;158	struct list_head *entry = journal->j_bitmap_nodes.next;159 160	journal->j_used_bitmap_nodes++;161repeat:162 163	if (entry != &journal->j_bitmap_nodes) {164		bn = list_entry(entry, struct reiserfs_bitmap_node, list);165		list_del(entry);166		memset(bn->data, 0, sb->s_blocksize);167		journal->j_free_bitmap_nodes--;168		return bn;169	}170	bn = allocate_bitmap_node(sb);171	if (!bn) {172		yield();173		goto repeat;174	}175	return bn;176}177static inline void free_bitmap_node(struct super_block *sb,178				    struct reiserfs_bitmap_node *bn)179{180	struct reiserfs_journal *journal = SB_JOURNAL(sb);181	journal->j_used_bitmap_nodes--;182	if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {183		kfree(bn->data);184		kfree(bn);185	} else {186		list_add(&bn->list, &journal->j_bitmap_nodes);187		journal->j_free_bitmap_nodes++;188	}189}190 191static void allocate_bitmap_nodes(struct super_block *sb)192{193	int i;194	struct reiserfs_journal *journal = SB_JOURNAL(sb);195	struct reiserfs_bitmap_node *bn = NULL;196	for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {197		bn = allocate_bitmap_node(sb);198		if (bn) {199			list_add(&bn->list, &journal->j_bitmap_nodes);200			journal->j_free_bitmap_nodes++;201		} else {202			/* this is ok, we'll try again when more are needed */203			break;204		}205	}206}207 208static int set_bit_in_list_bitmap(struct super_block *sb,209				  b_blocknr_t block,210				  struct reiserfs_list_bitmap *jb)211{212	unsigned int bmap_nr = block / (sb->s_blocksize << 3);213	unsigned int bit_nr = block % (sb->s_blocksize << 3);214 215	if (!jb->bitmaps[bmap_nr]) {216		jb->bitmaps[bmap_nr] = get_bitmap_node(sb);217	}218	set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);219	return 0;220}221 222static void cleanup_bitmap_list(struct super_block *sb,223				struct reiserfs_list_bitmap *jb)224{225	int i;226	if (jb->bitmaps == NULL)227		return;228 229	for (i = 0; i < reiserfs_bmap_count(sb); i++) {230		if (jb->bitmaps[i]) {231			free_bitmap_node(sb, jb->bitmaps[i]);232			jb->bitmaps[i] = NULL;233		}234	}235}236 237/*238 * only call this on FS unmount.239 */240static int free_list_bitmaps(struct super_block *sb,241			     struct reiserfs_list_bitmap *jb_array)242{243	int i;244	struct reiserfs_list_bitmap *jb;245	for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {246		jb = jb_array + i;247		jb->journal_list = NULL;248		cleanup_bitmap_list(sb, jb);249		vfree(jb->bitmaps);250		jb->bitmaps = NULL;251	}252	return 0;253}254 255static int free_bitmap_nodes(struct super_block *sb)256{257	struct reiserfs_journal *journal = SB_JOURNAL(sb);258	struct list_head *next = journal->j_bitmap_nodes.next;259	struct reiserfs_bitmap_node *bn;260 261	while (next != &journal->j_bitmap_nodes) {262		bn = list_entry(next, struct reiserfs_bitmap_node, list);263		list_del(next);264		kfree(bn->data);265		kfree(bn);266		next = journal->j_bitmap_nodes.next;267		journal->j_free_bitmap_nodes--;268	}269 270	return 0;271}272 273/*274 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.275 * jb_array is the array to be filled in.276 */277int reiserfs_allocate_list_bitmaps(struct super_block *sb,278				   struct reiserfs_list_bitmap *jb_array,279				   unsigned int bmap_nr)280{281	int i;282	int failed = 0;283	struct reiserfs_list_bitmap *jb;284	int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);285 286	for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {287		jb = jb_array + i;288		jb->journal_list = NULL;289		jb->bitmaps = vzalloc(mem);290		if (!jb->bitmaps) {291			reiserfs_warning(sb, "clm-2000", "unable to "292					 "allocate bitmaps for journal lists");293			failed = 1;294			break;295		}296	}297	if (failed) {298		free_list_bitmaps(sb, jb_array);299		return -1;300	}301	return 0;302}303 304/*305 * find an available list bitmap.  If you can't find one, flush a commit list306 * and try again307 */308static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,309						    struct reiserfs_journal_list310						    *jl)311{312	int i, j;313	struct reiserfs_journal *journal = SB_JOURNAL(sb);314	struct reiserfs_list_bitmap *jb = NULL;315 316	for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {317		i = journal->j_list_bitmap_index;318		journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;319		jb = journal->j_list_bitmap + i;320		if (journal->j_list_bitmap[i].journal_list) {321			flush_commit_list(sb,322					  journal->j_list_bitmap[i].323					  journal_list, 1);324			if (!journal->j_list_bitmap[i].journal_list) {325				break;326			}327		} else {328			break;329		}330	}331	/* double check to make sure if flushed correctly */332	if (jb->journal_list)333		return NULL;334	jb->journal_list = jl;335	return jb;336}337 338/*339 * allocates a new chunk of X nodes, and links them all together as a list.340 * Uses the cnode->next and cnode->prev pointers341 * returns NULL on failure342 */343static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)344{345	struct reiserfs_journal_cnode *head;346	int i;347	if (num_cnodes <= 0) {348		return NULL;349	}350	head = vzalloc(array_size(num_cnodes,351				  sizeof(struct reiserfs_journal_cnode)));352	if (!head) {353		return NULL;354	}355	head[0].prev = NULL;356	head[0].next = head + 1;357	for (i = 1; i < num_cnodes; i++) {358		head[i].prev = head + (i - 1);359		head[i].next = head + (i + 1);	/* if last one, overwrite it after the if */360	}361	head[num_cnodes - 1].next = NULL;362	return head;363}364 365/* pulls a cnode off the free list, or returns NULL on failure */366static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)367{368	struct reiserfs_journal_cnode *cn;369	struct reiserfs_journal *journal = SB_JOURNAL(sb);370 371	reiserfs_check_lock_depth(sb, "get_cnode");372 373	if (journal->j_cnode_free <= 0) {374		return NULL;375	}376	journal->j_cnode_used++;377	journal->j_cnode_free--;378	cn = journal->j_cnode_free_list;379	if (!cn) {380		return cn;381	}382	if (cn->next) {383		cn->next->prev = NULL;384	}385	journal->j_cnode_free_list = cn->next;386	memset(cn, 0, sizeof(struct reiserfs_journal_cnode));387	return cn;388}389 390/*391 * returns a cnode to the free list392 */393static void free_cnode(struct super_block *sb,394		       struct reiserfs_journal_cnode *cn)395{396	struct reiserfs_journal *journal = SB_JOURNAL(sb);397 398	reiserfs_check_lock_depth(sb, "free_cnode");399 400	journal->j_cnode_used--;401	journal->j_cnode_free++;402	/* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */403	cn->next = journal->j_cnode_free_list;404	if (journal->j_cnode_free_list) {405		journal->j_cnode_free_list->prev = cn;406	}407	cn->prev = NULL;	/* not needed with the memset, but I might kill the memset, and forget to do this */408	journal->j_cnode_free_list = cn;409}410 411static void clear_prepared_bits(struct buffer_head *bh)412{413	clear_buffer_journal_prepared(bh);414	clear_buffer_journal_restore_dirty(bh);415}416 417/*418 * return a cnode with same dev, block number and size in table,419 * or null if not found420 */421static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct422								  super_block423								  *sb,424								  struct425								  reiserfs_journal_cnode426								  **table,427								  long bl)428{429	struct reiserfs_journal_cnode *cn;430	cn = journal_hash(table, sb, bl);431	while (cn) {432		if (cn->blocknr == bl && cn->sb == sb)433			return cn;434		cn = cn->hnext;435	}436	return (struct reiserfs_journal_cnode *)0;437}438 439/*440 * this actually means 'can this block be reallocated yet?'.  If you set441 * search_all, a block can only be allocated if it is not in the current442 * transaction, was not freed by the current transaction, and has no chance443 * of ever being overwritten by a replay after crashing.444 *445 * If you don't set search_all, a block can only be allocated if it is not446 * in the current transaction.  Since deleting a block removes it from the447 * current transaction, this case should never happen.  If you don't set448 * search_all, make sure you never write the block without logging it.449 *450 * next_zero_bit is a suggestion about the next block to try for find_forward.451 * when bl is rejected because it is set in a journal list bitmap, we search452 * for the next zero bit in the bitmap that rejected bl.  Then, we return453 * that through next_zero_bit for find_forward to try.454 *455 * Just because we return something in next_zero_bit does not mean we won't456 * reject it on the next call to reiserfs_in_journal457 */458int reiserfs_in_journal(struct super_block *sb,459			unsigned int bmap_nr, int bit_nr, int search_all,460			b_blocknr_t * next_zero_bit)461{462	struct reiserfs_journal *journal = SB_JOURNAL(sb);463	struct reiserfs_list_bitmap *jb;464	int i;465	unsigned long bl;466 467	*next_zero_bit = 0;	/* always start this at zero. */468 469	PROC_INFO_INC(sb, journal.in_journal);470	/*471	 * If we aren't doing a search_all, this is a metablock, and it472	 * will be logged before use.  if we crash before the transaction473	 * that freed it commits,  this transaction won't have committed474	 * either, and the block will never be written475	 */476	if (search_all) {477		for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {478			PROC_INFO_INC(sb, journal.in_journal_bitmap);479			jb = journal->j_list_bitmap + i;480			if (jb->journal_list && jb->bitmaps[bmap_nr] &&481			    test_bit(bit_nr,482				     (unsigned long *)jb->bitmaps[bmap_nr]->483				     data)) {484				*next_zero_bit =485				    find_next_zero_bit((unsigned long *)486						       (jb->bitmaps[bmap_nr]->487							data),488						       sb->s_blocksize << 3,489						       bit_nr + 1);490				return 1;491			}492		}493	}494 495	bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;496	/* is it in any old transactions? */497	if (search_all498	    && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {499		return 1;500	}501 502	/* is it in the current transaction.  This should never happen */503	if ((get_journal_hash_dev(sb, journal->j_hash_table, bl))) {504		BUG();505		return 1;506	}507 508	PROC_INFO_INC(sb, journal.in_journal_reusable);509	/* safe for reuse */510	return 0;511}512 513/* insert cn into table */514static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,515				       struct reiserfs_journal_cnode *cn)516{517	struct reiserfs_journal_cnode *cn_orig;518 519	cn_orig = journal_hash(table, cn->sb, cn->blocknr);520	cn->hnext = cn_orig;521	cn->hprev = NULL;522	if (cn_orig) {523		cn_orig->hprev = cn;524	}525	journal_hash(table, cn->sb, cn->blocknr) = cn;526}527 528/* lock the current transaction */529static inline void lock_journal(struct super_block *sb)530{531	PROC_INFO_INC(sb, journal.lock_journal);532 533	reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);534}535 536/* unlock the current transaction */537static inline void unlock_journal(struct super_block *sb)538{539	mutex_unlock(&SB_JOURNAL(sb)->j_mutex);540}541 542static inline void get_journal_list(struct reiserfs_journal_list *jl)543{544	jl->j_refcount++;545}546 547static inline void put_journal_list(struct super_block *s,548				    struct reiserfs_journal_list *jl)549{550	if (jl->j_refcount < 1) {551		reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",552			       jl->j_trans_id, jl->j_refcount);553	}554	if (--jl->j_refcount == 0)555		kfree(jl);556}557 558/*559 * this used to be much more involved, and I'm keeping it just in case560 * things get ugly again.  it gets called by flush_commit_list, and561 * cleans up any data stored about blocks freed during a transaction.562 */563static void cleanup_freed_for_journal_list(struct super_block *sb,564					   struct reiserfs_journal_list *jl)565{566 567	struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;568	if (jb) {569		cleanup_bitmap_list(sb, jb);570	}571	jl->j_list_bitmap->journal_list = NULL;572	jl->j_list_bitmap = NULL;573}574 575static int journal_list_still_alive(struct super_block *s,576				    unsigned int trans_id)577{578	struct reiserfs_journal *journal = SB_JOURNAL(s);579	struct list_head *entry = &journal->j_journal_list;580	struct reiserfs_journal_list *jl;581 582	if (!list_empty(entry)) {583		jl = JOURNAL_LIST_ENTRY(entry->next);584		if (jl->j_trans_id <= trans_id) {585			return 1;586		}587	}588	return 0;589}590 591/*592 * If page->mapping was null, we failed to truncate this page for593 * some reason.  Most likely because it was truncated after being594 * logged via data=journal.595 *596 * This does a check to see if the buffer belongs to one of these597 * lost pages before doing the final put_bh.  If page->mapping was598 * null, it tries to free buffers on the page, which should make the599 * final put_page drop the page from the lru.600 */601static void release_buffer_page(struct buffer_head *bh)602{603	struct folio *folio = bh->b_folio;604	if (!folio->mapping && folio_trylock(folio)) {605		folio_get(folio);606		put_bh(bh);607		if (!folio->mapping)608			try_to_free_buffers(folio);609		folio_unlock(folio);610		folio_put(folio);611	} else {612		put_bh(bh);613	}614}615 616static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)617{618	if (buffer_journaled(bh)) {619		reiserfs_warning(NULL, "clm-2084",620				 "pinned buffer %lu:%pg sent to disk",621				 bh->b_blocknr, bh->b_bdev);622	}623	if (uptodate)624		set_buffer_uptodate(bh);625	else626		clear_buffer_uptodate(bh);627 628	unlock_buffer(bh);629	release_buffer_page(bh);630}631 632static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)633{634	if (uptodate)635		set_buffer_uptodate(bh);636	else637		clear_buffer_uptodate(bh);638	unlock_buffer(bh);639	put_bh(bh);640}641 642static void submit_logged_buffer(struct buffer_head *bh)643{644	get_bh(bh);645	bh->b_end_io = reiserfs_end_buffer_io_sync;646	clear_buffer_journal_new(bh);647	clear_buffer_dirty(bh);648	if (!test_clear_buffer_journal_test(bh))649		BUG();650	if (!buffer_uptodate(bh))651		BUG();652	submit_bh(REQ_OP_WRITE, bh);653}654 655static void submit_ordered_buffer(struct buffer_head *bh)656{657	get_bh(bh);658	bh->b_end_io = reiserfs_end_ordered_io;659	clear_buffer_dirty(bh);660	if (!buffer_uptodate(bh))661		BUG();662	submit_bh(REQ_OP_WRITE, bh);663}664 665#define CHUNK_SIZE 32666struct buffer_chunk {667	struct buffer_head *bh[CHUNK_SIZE];668	int nr;669};670 671static void write_chunk(struct buffer_chunk *chunk)672{673	int i;674	for (i = 0; i < chunk->nr; i++) {675		submit_logged_buffer(chunk->bh[i]);676	}677	chunk->nr = 0;678}679 680static void write_ordered_chunk(struct buffer_chunk *chunk)681{682	int i;683	for (i = 0; i < chunk->nr; i++) {684		submit_ordered_buffer(chunk->bh[i]);685	}686	chunk->nr = 0;687}688 689static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,690			spinlock_t * lock, void (fn) (struct buffer_chunk *))691{692	int ret = 0;693	BUG_ON(chunk->nr >= CHUNK_SIZE);694	chunk->bh[chunk->nr++] = bh;695	if (chunk->nr >= CHUNK_SIZE) {696		ret = 1;697		if (lock) {698			spin_unlock(lock);699			fn(chunk);700			spin_lock(lock);701		} else {702			fn(chunk);703		}704	}705	return ret;706}707 708static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);709static struct reiserfs_jh *alloc_jh(void)710{711	struct reiserfs_jh *jh;712	while (1) {713		jh = kmalloc(sizeof(*jh), GFP_NOFS);714		if (jh) {715			atomic_inc(&nr_reiserfs_jh);716			return jh;717		}718		yield();719	}720}721 722/*723 * we want to free the jh when the buffer has been written724 * and waited on725 */726void reiserfs_free_jh(struct buffer_head *bh)727{728	struct reiserfs_jh *jh;729 730	jh = bh->b_private;731	if (jh) {732		bh->b_private = NULL;733		jh->bh = NULL;734		list_del_init(&jh->list);735		kfree(jh);736		if (atomic_read(&nr_reiserfs_jh) <= 0)737			BUG();738		atomic_dec(&nr_reiserfs_jh);739		put_bh(bh);740	}741}742 743static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,744			   int tail)745{746	struct reiserfs_jh *jh;747 748	if (bh->b_private) {749		spin_lock(&j->j_dirty_buffers_lock);750		if (!bh->b_private) {751			spin_unlock(&j->j_dirty_buffers_lock);752			goto no_jh;753		}754		jh = bh->b_private;755		list_del_init(&jh->list);756	} else {757no_jh:758		get_bh(bh);759		jh = alloc_jh();760		spin_lock(&j->j_dirty_buffers_lock);761		/*762		 * buffer must be locked for __add_jh, should be able to have763		 * two adds at the same time764		 */765		BUG_ON(bh->b_private);766		jh->bh = bh;767		bh->b_private = jh;768	}769	jh->jl = j->j_current_jl;770	if (tail)771		list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);772	else {773		list_add_tail(&jh->list, &jh->jl->j_bh_list);774	}775	spin_unlock(&j->j_dirty_buffers_lock);776	return 0;777}778 779int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)780{781	return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);782}783int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)784{785	return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);786}787 788#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)789static int write_ordered_buffers(spinlock_t * lock,790				 struct reiserfs_journal *j,791				 struct reiserfs_journal_list *jl,792				 struct list_head *list)793{794	struct buffer_head *bh;795	struct reiserfs_jh *jh;796	int ret = j->j_errno;797	struct buffer_chunk chunk;798	struct list_head tmp;799	INIT_LIST_HEAD(&tmp);800 801	chunk.nr = 0;802	spin_lock(lock);803	while (!list_empty(list)) {804		jh = JH_ENTRY(list->next);805		bh = jh->bh;806		get_bh(bh);807		if (!trylock_buffer(bh)) {808			if (!buffer_dirty(bh)) {809				list_move(&jh->list, &tmp);810				goto loop_next;811			}812			spin_unlock(lock);813			if (chunk.nr)814				write_ordered_chunk(&chunk);815			wait_on_buffer(bh);816			cond_resched();817			spin_lock(lock);818			goto loop_next;819		}820		/*821		 * in theory, dirty non-uptodate buffers should never get here,822		 * but the upper layer io error paths still have a few quirks.823		 * Handle them here as gracefully as we can824		 */825		if (!buffer_uptodate(bh) && buffer_dirty(bh)) {826			clear_buffer_dirty(bh);827			ret = -EIO;828		}829		if (buffer_dirty(bh)) {830			list_move(&jh->list, &tmp);831			add_to_chunk(&chunk, bh, lock, write_ordered_chunk);832		} else {833			reiserfs_free_jh(bh);834			unlock_buffer(bh);835		}836loop_next:837		put_bh(bh);838		cond_resched_lock(lock);839	}840	if (chunk.nr) {841		spin_unlock(lock);842		write_ordered_chunk(&chunk);843		spin_lock(lock);844	}845	while (!list_empty(&tmp)) {846		jh = JH_ENTRY(tmp.prev);847		bh = jh->bh;848		get_bh(bh);849		reiserfs_free_jh(bh);850 851		if (buffer_locked(bh)) {852			spin_unlock(lock);853			wait_on_buffer(bh);854			spin_lock(lock);855		}856		if (!buffer_uptodate(bh)) {857			ret = -EIO;858		}859		/*860		 * ugly interaction with invalidate_folio here.861		 * reiserfs_invalidate_folio will pin any buffer that has a862		 * valid journal head from an older transaction.  If someone863		 * else sets our buffer dirty after we write it in the first864		 * loop, and then someone truncates the page away, nobody865		 * will ever write the buffer. We're safe if we write the866		 * page one last time after freeing the journal header.867		 */868		if (buffer_dirty(bh) && unlikely(bh->b_folio->mapping == NULL)) {869			spin_unlock(lock);870			write_dirty_buffer(bh, 0);871			spin_lock(lock);872		}873		put_bh(bh);874		cond_resched_lock(lock);875	}876	spin_unlock(lock);877	return ret;878}879 880static int flush_older_commits(struct super_block *s,881			       struct reiserfs_journal_list *jl)882{883	struct reiserfs_journal *journal = SB_JOURNAL(s);884	struct reiserfs_journal_list *other_jl;885	struct reiserfs_journal_list *first_jl;886	struct list_head *entry;887	unsigned int trans_id = jl->j_trans_id;888	unsigned int other_trans_id;889 890find_first:891	/*892	 * first we walk backwards to find the oldest uncommitted transation893	 */894	first_jl = jl;895	entry = jl->j_list.prev;896	while (1) {897		other_jl = JOURNAL_LIST_ENTRY(entry);898		if (entry == &journal->j_journal_list ||899		    atomic_read(&other_jl->j_older_commits_done))900			break;901 902		first_jl = other_jl;903		entry = other_jl->j_list.prev;904	}905 906	/* if we didn't find any older uncommitted transactions, return now */907	if (first_jl == jl) {908		return 0;909	}910 911	entry = &first_jl->j_list;912	while (1) {913		other_jl = JOURNAL_LIST_ENTRY(entry);914		other_trans_id = other_jl->j_trans_id;915 916		if (other_trans_id < trans_id) {917			if (atomic_read(&other_jl->j_commit_left) != 0) {918				flush_commit_list(s, other_jl, 0);919 920				/* list we were called with is gone, return */921				if (!journal_list_still_alive(s, trans_id))922					return 1;923 924				/*925				 * the one we just flushed is gone, this means926				 * all older lists are also gone, so first_jl927				 * is no longer valid either.  Go back to the928				 * beginning.929				 */930				if (!journal_list_still_alive931				    (s, other_trans_id)) {932					goto find_first;933				}934			}935			entry = entry->next;936			if (entry == &journal->j_journal_list)937				return 0;938		} else {939			return 0;940		}941	}942	return 0;943}944 945static int reiserfs_async_progress_wait(struct super_block *s)946{947	struct reiserfs_journal *j = SB_JOURNAL(s);948 949	if (atomic_read(&j->j_async_throttle)) {950		int depth;951 952		depth = reiserfs_write_unlock_nested(s);953		wait_var_event_timeout(&j->j_async_throttle,954				       atomic_read(&j->j_async_throttle) == 0,955				       HZ / 10);956		reiserfs_write_lock_nested(s, depth);957	}958 959	return 0;960}961 962/*963 * if this journal list still has commit blocks unflushed, send them to disk.964 *965 * log areas must be flushed in order (transaction 2 can't commit before966 * transaction 1) Before the commit block can by written, every other log967 * block must be safely on disk968 */969static int flush_commit_list(struct super_block *s,970			     struct reiserfs_journal_list *jl, int flushall)971{972	int i;973	b_blocknr_t bn;974	struct buffer_head *tbh = NULL;975	unsigned int trans_id = jl->j_trans_id;976	struct reiserfs_journal *journal = SB_JOURNAL(s);977	int retval = 0;978	int write_len;979	int depth;980 981	reiserfs_check_lock_depth(s, "flush_commit_list");982 983	if (atomic_read(&jl->j_older_commits_done)) {984		return 0;985	}986 987	/*988	 * before we can put our commit blocks on disk, we have to make989	 * sure everyone older than us is on disk too990	 */991	BUG_ON(jl->j_len <= 0);992	BUG_ON(trans_id == journal->j_trans_id);993 994	get_journal_list(jl);995	if (flushall) {996		if (flush_older_commits(s, jl) == 1) {997			/*998			 * list disappeared during flush_older_commits.999			 * return1000			 */1001			goto put_jl;1002		}1003	}1004 1005	/* make sure nobody is trying to flush this one at the same time */1006	reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);1007 1008	if (!journal_list_still_alive(s, trans_id)) {1009		mutex_unlock(&jl->j_commit_mutex);1010		goto put_jl;1011	}1012	BUG_ON(jl->j_trans_id == 0);1013 1014	/* this commit is done, exit */1015	if (atomic_read(&jl->j_commit_left) <= 0) {1016		if (flushall) {1017			atomic_set(&jl->j_older_commits_done, 1);1018		}1019		mutex_unlock(&jl->j_commit_mutex);1020		goto put_jl;1021	}1022 1023	if (!list_empty(&jl->j_bh_list)) {1024		int ret;1025 1026		/*1027		 * We might sleep in numerous places inside1028		 * write_ordered_buffers. Relax the write lock.1029		 */1030		depth = reiserfs_write_unlock_nested(s);1031		ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,1032					    journal, jl, &jl->j_bh_list);1033		if (ret < 0 && retval == 0)1034			retval = ret;1035		reiserfs_write_lock_nested(s, depth);1036	}1037	BUG_ON(!list_empty(&jl->j_bh_list));1038	/*1039	 * for the description block and all the log blocks, submit any buffers1040	 * that haven't already reached the disk.  Try to write at least 2561041	 * log blocks. later on, we will only wait on blocks that correspond1042	 * to this transaction, but while we're unplugging we might as well1043	 * get a chunk of data on there.1044	 */1045	atomic_inc(&journal->j_async_throttle);1046	write_len = jl->j_len + 1;1047	if (write_len < 256)1048		write_len = 256;1049	for (i = 0 ; i < write_len ; i++) {1050		bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %1051		    SB_ONDISK_JOURNAL_SIZE(s);1052		tbh = journal_find_get_block(s, bn);1053		if (tbh) {1054			if (buffer_dirty(tbh)) {1055		            depth = reiserfs_write_unlock_nested(s);1056			    write_dirty_buffer(tbh, 0);1057			    reiserfs_write_lock_nested(s, depth);1058			}1059			put_bh(tbh) ;1060		}1061	}1062	if (atomic_dec_and_test(&journal->j_async_throttle))1063		wake_up_var(&journal->j_async_throttle);1064 1065	for (i = 0; i < (jl->j_len + 1); i++) {1066		bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +1067		    (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);1068		tbh = journal_find_get_block(s, bn);1069 1070		depth = reiserfs_write_unlock_nested(s);1071		__wait_on_buffer(tbh);1072		reiserfs_write_lock_nested(s, depth);1073		/*1074		 * since we're using ll_rw_blk above, it might have skipped1075		 * over a locked buffer.  Double check here1076		 */1077		/* redundant, sync_dirty_buffer() checks */1078		if (buffer_dirty(tbh)) {1079			depth = reiserfs_write_unlock_nested(s);1080			sync_dirty_buffer(tbh);1081			reiserfs_write_lock_nested(s, depth);1082		}1083		if (unlikely(!buffer_uptodate(tbh))) {1084#ifdef CONFIG_REISERFS_CHECK1085			reiserfs_warning(s, "journal-601",1086					 "buffer write failed");1087#endif1088			retval = -EIO;1089		}1090		/* once for journal_find_get_block */1091		put_bh(tbh);1092		/* once due to original getblk in do_journal_end */1093		put_bh(tbh);1094		atomic_dec(&jl->j_commit_left);1095	}1096 1097	BUG_ON(atomic_read(&jl->j_commit_left) != 1);1098 1099	/*1100	 * If there was a write error in the journal - we can't commit1101	 * this transaction - it will be invalid and, if successful,1102	 * will just end up propagating the write error out to1103	 * the file system.1104	 */1105	if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {1106		if (buffer_dirty(jl->j_commit_bh))1107			BUG();1108		mark_buffer_dirty(jl->j_commit_bh) ;1109		depth = reiserfs_write_unlock_nested(s);1110		if (reiserfs_barrier_flush(s))1111			__sync_dirty_buffer(jl->j_commit_bh,1112					REQ_SYNC | REQ_PREFLUSH | REQ_FUA);1113		else1114			sync_dirty_buffer(jl->j_commit_bh);1115		reiserfs_write_lock_nested(s, depth);1116	}1117 1118	/*1119	 * If there was a write error in the journal - we can't commit this1120	 * transaction - it will be invalid and, if successful, will just end1121	 * up propagating the write error out to the filesystem.1122	 */1123	if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {1124#ifdef CONFIG_REISERFS_CHECK1125		reiserfs_warning(s, "journal-615", "buffer write failed");1126#endif1127		retval = -EIO;1128	}1129	bforget(jl->j_commit_bh);1130	if (journal->j_last_commit_id != 0 &&1131	    (jl->j_trans_id - journal->j_last_commit_id) != 1) {1132		reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",1133				 journal->j_last_commit_id, jl->j_trans_id);1134	}1135	journal->j_last_commit_id = jl->j_trans_id;1136 1137	/*1138	 * now, every commit block is on the disk.  It is safe to allow1139	 * blocks freed during this transaction to be reallocated1140	 */1141	cleanup_freed_for_journal_list(s, jl);1142 1143	retval = retval ? retval : journal->j_errno;1144 1145	/* mark the metadata dirty */1146	if (!retval)1147		dirty_one_transaction(s, jl);1148	atomic_dec(&jl->j_commit_left);1149 1150	if (flushall) {1151		atomic_set(&jl->j_older_commits_done, 1);1152	}1153	mutex_unlock(&jl->j_commit_mutex);1154put_jl:1155	put_journal_list(s, jl);1156 1157	if (retval)1158		reiserfs_abort(s, retval, "Journal write error in %s",1159			       __func__);1160	return retval;1161}1162 1163/*1164 * flush_journal_list frequently needs to find a newer transaction for a1165 * given block.  This does that, or returns NULL if it can't find anything1166 */1167static struct reiserfs_journal_list *find_newer_jl_for_cn(struct1168							  reiserfs_journal_cnode1169							  *cn)1170{1171	struct super_block *sb = cn->sb;1172	b_blocknr_t blocknr = cn->blocknr;1173 1174	cn = cn->hprev;1175	while (cn) {1176		if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {1177			return cn->jlist;1178		}1179		cn = cn->hprev;1180	}1181	return NULL;1182}1183 1184static void remove_journal_hash(struct super_block *,1185				struct reiserfs_journal_cnode **,1186				struct reiserfs_journal_list *, unsigned long,1187				int);1188 1189/*1190 * once all the real blocks have been flushed, it is safe to remove them1191 * from the journal list for this transaction.  Aside from freeing the1192 * cnode, this also allows the block to be reallocated for data blocks1193 * if it had been deleted.1194 */1195static void remove_all_from_journal_list(struct super_block *sb,1196					 struct reiserfs_journal_list *jl,1197					 int debug)1198{1199	struct reiserfs_journal *journal = SB_JOURNAL(sb);1200	struct reiserfs_journal_cnode *cn, *last;1201	cn = jl->j_realblock;1202 1203	/*1204	 * which is better, to lock once around the whole loop, or1205	 * to lock for each call to remove_journal_hash?1206	 */1207	while (cn) {1208		if (cn->blocknr != 0) {1209			if (debug) {1210				reiserfs_warning(sb, "reiserfs-2201",1211						 "block %u, bh is %d, state %ld",1212						 cn->blocknr, cn->bh ? 1 : 0,1213						 cn->state);1214			}1215			cn->state = 0;1216			remove_journal_hash(sb, journal->j_list_hash_table,1217					    jl, cn->blocknr, 1);1218		}1219		last = cn;1220		cn = cn->next;1221		free_cnode(sb, last);1222	}1223	jl->j_realblock = NULL;1224}1225 1226/*1227 * if this timestamp is greater than the timestamp we wrote last to the1228 * header block, write it to the header block.  once this is done, I can1229 * safely say the log area for this transaction won't ever be replayed,1230 * and I can start releasing blocks in this transaction for reuse as data1231 * blocks.  called by flush_journal_list, before it calls1232 * remove_all_from_journal_list1233 */1234static int _update_journal_header_block(struct super_block *sb,1235					unsigned long offset,1236					unsigned int trans_id)1237{1238	struct reiserfs_journal_header *jh;1239	struct reiserfs_journal *journal = SB_JOURNAL(sb);1240	int depth;1241 1242	if (reiserfs_is_journal_aborted(journal))1243		return -EIO;1244 1245	if (trans_id >= journal->j_last_flush_trans_id) {1246		if (buffer_locked((journal->j_header_bh))) {1247			depth = reiserfs_write_unlock_nested(sb);1248			__wait_on_buffer(journal->j_header_bh);1249			reiserfs_write_lock_nested(sb, depth);1250			if (unlikely(!buffer_uptodate(journal->j_header_bh))) {1251#ifdef CONFIG_REISERFS_CHECK1252				reiserfs_warning(sb, "journal-699",1253						 "buffer write failed");1254#endif1255				return -EIO;1256			}1257		}1258		journal->j_last_flush_trans_id = trans_id;1259		journal->j_first_unflushed_offset = offset;1260		jh = (struct reiserfs_journal_header *)(journal->j_header_bh->1261							b_data);1262		jh->j_last_flush_trans_id = cpu_to_le32(trans_id);1263		jh->j_first_unflushed_offset = cpu_to_le32(offset);1264		jh->j_mount_id = cpu_to_le32(journal->j_mount_id);1265 1266		set_buffer_dirty(journal->j_header_bh);1267		depth = reiserfs_write_unlock_nested(sb);1268 1269		if (reiserfs_barrier_flush(sb))1270			__sync_dirty_buffer(journal->j_header_bh,1271					REQ_SYNC | REQ_PREFLUSH | REQ_FUA);1272		else1273			sync_dirty_buffer(journal->j_header_bh);1274 1275		reiserfs_write_lock_nested(sb, depth);1276		if (!buffer_uptodate(journal->j_header_bh)) {1277			reiserfs_warning(sb, "journal-837",1278					 "IO error during journal replay");1279			return -EIO;1280		}1281	}1282	return 0;1283}1284 1285static int update_journal_header_block(struct super_block *sb,1286				       unsigned long offset,1287				       unsigned int trans_id)1288{1289	return _update_journal_header_block(sb, offset, trans_id);1290}1291 1292/*1293** flush any and all journal lists older than you are1294** can only be called from flush_journal_list1295*/1296static int flush_older_journal_lists(struct super_block *sb,1297				     struct reiserfs_journal_list *jl)1298{1299	struct list_head *entry;1300	struct reiserfs_journal_list *other_jl;1301	struct reiserfs_journal *journal = SB_JOURNAL(sb);1302	unsigned int trans_id = jl->j_trans_id;1303 1304	/*1305	 * we know we are the only ones flushing things, no extra race1306	 * protection is required.1307	 */1308restart:1309	entry = journal->j_journal_list.next;1310	/* Did we wrap? */1311	if (entry == &journal->j_journal_list)1312		return 0;1313	other_jl = JOURNAL_LIST_ENTRY(entry);1314	if (other_jl->j_trans_id < trans_id) {1315		BUG_ON(other_jl->j_refcount <= 0);1316		/* do not flush all */1317		flush_journal_list(sb, other_jl, 0);1318 1319		/* other_jl is now deleted from the list */1320		goto restart;1321	}1322	return 0;1323}1324 1325static void del_from_work_list(struct super_block *s,1326			       struct reiserfs_journal_list *jl)1327{1328	struct reiserfs_journal *journal = SB_JOURNAL(s);1329	if (!list_empty(&jl->j_working_list)) {1330		list_del_init(&jl->j_working_list);1331		journal->j_num_work_lists--;1332	}1333}1334 1335/*1336 * flush a journal list, both commit and real blocks1337 *1338 * always set flushall to 1, unless you are calling from inside1339 * flush_journal_list1340 *1341 * IMPORTANT.  This can only be called while there are no journal writers,1342 * and the journal is locked.  That means it can only be called from1343 * do_journal_end, or by journal_release1344 */1345static int flush_journal_list(struct super_block *s,1346			      struct reiserfs_journal_list *jl, int flushall)1347{1348	struct reiserfs_journal_list *pjl;1349	struct reiserfs_journal_cnode *cn;1350	int count;1351	int was_jwait = 0;1352	int was_dirty = 0;1353	struct buffer_head *saved_bh;1354	unsigned long j_len_saved = jl->j_len;1355	struct reiserfs_journal *journal = SB_JOURNAL(s);1356	int err = 0;1357	int depth;1358 1359	BUG_ON(j_len_saved <= 0);1360 1361	if (atomic_read(&journal->j_wcount) != 0) {1362		reiserfs_warning(s, "clm-2048", "called with wcount %d",1363				 atomic_read(&journal->j_wcount));1364	}1365 1366	/* if flushall == 0, the lock is already held */1367	if (flushall) {1368		reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);1369	} else if (mutex_trylock(&journal->j_flush_mutex)) {1370		BUG();1371	}1372 1373	count = 0;1374	if (j_len_saved > journal->j_trans_max) {1375		reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",1376			       j_len_saved, jl->j_trans_id);1377		return 0;1378	}1379 1380	/* if all the work is already done, get out of here */1381	if (atomic_read(&jl->j_nonzerolen) <= 0 &&1382	    atomic_read(&jl->j_commit_left) <= 0) {1383		goto flush_older_and_return;1384	}1385 1386	/*1387	 * start by putting the commit list on disk.  This will also flush1388	 * the commit lists of any olders transactions1389	 */1390	flush_commit_list(s, jl, 1);1391 1392	if (!(jl->j_state & LIST_DIRTY)1393	    && !reiserfs_is_journal_aborted(journal))1394		BUG();1395 1396	/* are we done now? */1397	if (atomic_read(&jl->j_nonzerolen) <= 0 &&1398	    atomic_read(&jl->j_commit_left) <= 0) {1399		goto flush_older_and_return;1400	}1401 1402	/*1403	 * loop through each cnode, see if we need to write it,1404	 * or wait on a more recent transaction, or just ignore it1405	 */1406	if (atomic_read(&journal->j_wcount) != 0) {1407		reiserfs_panic(s, "journal-844", "journal list is flushing, "1408			       "wcount is not 0");1409	}1410	cn = jl->j_realblock;1411	while (cn) {1412		was_jwait = 0;1413		was_dirty = 0;1414		saved_bh = NULL;1415		/* blocknr of 0 is no longer in the hash, ignore it */1416		if (cn->blocknr == 0) {1417			goto free_cnode;1418		}1419 1420		/*1421		 * This transaction failed commit.1422		 * Don't write out to the disk1423		 */1424		if (!(jl->j_state & LIST_DIRTY))1425			goto free_cnode;1426 1427		pjl = find_newer_jl_for_cn(cn);1428		/*1429		 * the order is important here.  We check pjl to make sure we1430		 * don't clear BH_JDirty_wait if we aren't the one writing this1431		 * block to disk1432		 */1433		if (!pjl && cn->bh) {1434			saved_bh = cn->bh;1435 1436			/*1437			 * we do this to make sure nobody releases the1438			 * buffer while we are working with it1439			 */1440			get_bh(saved_bh);1441 1442			if (buffer_journal_dirty(saved_bh)) {1443				BUG_ON(!can_dirty(cn));1444				was_jwait = 1;1445				was_dirty = 1;1446			} else if (can_dirty(cn)) {1447				/*1448				 * everything with !pjl && jwait1449				 * should be writable1450				 */1451				BUG();1452			}1453		}1454 1455		/*1456		 * if someone has this block in a newer transaction, just make1457		 * sure they are committed, and don't try writing it to disk1458		 */1459		if (pjl) {1460			if (atomic_read(&pjl->j_commit_left))1461				flush_commit_list(s, pjl, 1);1462			goto free_cnode;1463		}1464 1465		/*1466		 * bh == NULL when the block got to disk on its own, OR,1467		 * the block got freed in a future transaction1468		 */1469		if (saved_bh == NULL) {1470			goto free_cnode;1471		}1472 1473		/*1474		 * this should never happen.  kupdate_one_transaction has1475		 * this list locked while it works, so we should never see a1476		 * buffer here that is not marked JDirty_wait1477		 */1478		if ((!was_jwait) && !buffer_locked(saved_bh)) {1479			reiserfs_warning(s, "journal-813",1480					 "BAD! buffer %llu %cdirty %cjwait, "1481					 "not in a newer transaction",1482					 (unsigned long long)saved_bh->1483					 b_blocknr, was_dirty ? ' ' : '!',1484					 was_jwait ? ' ' : '!');1485		}1486		if (was_dirty) {1487			/*1488			 * we inc again because saved_bh gets decremented1489			 * at free_cnode1490			 */1491			get_bh(saved_bh);1492			set_bit(BLOCK_NEEDS_FLUSH, &cn->state);1493			lock_buffer(saved_bh);1494			BUG_ON(cn->blocknr != saved_bh->b_blocknr);1495			if (buffer_dirty(saved_bh))1496				submit_logged_buffer(saved_bh);1497			else1498				unlock_buffer(saved_bh);1499			count++;1500		} else {1501			reiserfs_warning(s, "clm-2082",1502					 "Unable to flush buffer %llu in %s",1503					 (unsigned long long)saved_bh->1504					 b_blocknr, __func__);1505		}1506free_cnode:1507		cn = cn->next;1508		if (saved_bh) {1509			/*1510			 * we incremented this to keep others from1511			 * taking the buffer head away1512			 */1513			put_bh(saved_bh);1514			if (atomic_read(&saved_bh->b_count) < 0) {1515				reiserfs_warning(s, "journal-945",1516						 "saved_bh->b_count < 0");1517			}1518		}1519	}1520	if (count > 0) {1521		cn = jl->j_realblock;1522		while (cn) {1523			if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {1524				if (!cn->bh) {1525					reiserfs_panic(s, "journal-1011",1526						       "cn->bh is NULL");1527				}1528 1529				depth = reiserfs_write_unlock_nested(s);1530				__wait_on_buffer(cn->bh);1531				reiserfs_write_lock_nested(s, depth);1532 1533				if (!cn->bh) {1534					reiserfs_panic(s, "journal-1012",1535						       "cn->bh is NULL");1536				}1537				if (unlikely(!buffer_uptodate(cn->bh))) {1538#ifdef CONFIG_REISERFS_CHECK1539					reiserfs_warning(s, "journal-949",1540							 "buffer write failed");1541#endif1542					err = -EIO;1543				}1544				/*1545				 * note, we must clear the JDirty_wait bit1546				 * after the up to date check, otherwise we1547				 * race against our flushpage routine1548				 */1549				BUG_ON(!test_clear_buffer_journal_dirty1550				       (cn->bh));1551 1552				/* drop one ref for us */1553				put_bh(cn->bh);1554				/* drop one ref for journal_mark_dirty */1555				release_buffer_page(cn->bh);1556			}1557			cn = cn->next;1558		}1559	}1560 1561	if (err)1562		reiserfs_abort(s, -EIO,1563			       "Write error while pushing transaction to disk in %s",1564			       __func__);1565flush_older_and_return:1566 1567	/*1568	 * before we can update the journal header block, we _must_ flush all1569	 * real blocks from all older transactions to disk.  This is because1570	 * once the header block is updated, this transaction will not be1571	 * replayed after a crash1572	 */1573	if (flushall) {1574		flush_older_journal_lists(s, jl);1575	}1576 1577	err = journal->j_errno;1578	/*1579	 * before we can remove everything from the hash tables for this1580	 * transaction, we must make sure it can never be replayed1581	 *1582	 * since we are only called from do_journal_end, we know for sure there1583	 * are no allocations going on while we are flushing journal lists.  So,1584	 * we only need to update the journal header block for the last list1585	 * being flushed1586	 */1587	if (!err && flushall) {1588		err =1589		    update_journal_header_block(s,1590						(jl->j_start + jl->j_len +1591						 2) % SB_ONDISK_JOURNAL_SIZE(s),1592						jl->j_trans_id);1593		if (err)1594			reiserfs_abort(s, -EIO,1595				       "Write error while updating journal header in %s",1596				       __func__);1597	}1598	remove_all_from_journal_list(s, jl, 0);1599	list_del_init(&jl->j_list);1600	journal->j_num_lists--;1601	del_from_work_list(s, jl);1602 1603	if (journal->j_last_flush_id != 0 &&1604	    (jl->j_trans_id - journal->j_last_flush_id) != 1) {1605		reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",1606				 journal->j_last_flush_id, jl->j_trans_id);1607	}1608	journal->j_last_flush_id = jl->j_trans_id;1609 1610	/*1611	 * not strictly required since we are freeing the list, but it should1612	 * help find code using dead lists later on1613	 */1614	jl->j_len = 0;1615	atomic_set(&jl->j_nonzerolen, 0);1616	jl->j_start = 0;1617	jl->j_realblock = NULL;1618	jl->j_commit_bh = NULL;1619	jl->j_trans_id = 0;1620	jl->j_state = 0;1621	put_journal_list(s, jl);1622	if (flushall)1623		mutex_unlock(&journal->j_flush_mutex);1624	return err;1625}1626 1627static int write_one_transaction(struct super_block *s,1628				 struct reiserfs_journal_list *jl,1629				 struct buffer_chunk *chunk)1630{1631	struct reiserfs_journal_cnode *cn;1632	int ret = 0;1633 1634	jl->j_state |= LIST_TOUCHED;1635	del_from_work_list(s, jl);1636	if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {1637		return 0;1638	}1639 1640	cn = jl->j_realblock;1641	while (cn) {1642		/*1643		 * if the blocknr == 0, this has been cleared from the hash,1644		 * skip it1645		 */1646		if (cn->blocknr == 0) {1647			goto next;1648		}1649		if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {1650			struct buffer_head *tmp_bh;1651			/*1652			 * we can race against journal_mark_freed when we try1653			 * to lock_buffer(cn->bh), so we have to inc the buffer1654			 * count, and recheck things after locking1655			 */1656			tmp_bh = cn->bh;1657			get_bh(tmp_bh);1658			lock_buffer(tmp_bh);1659			if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {1660				if (!buffer_journal_dirty(tmp_bh) ||1661				    buffer_journal_prepared(tmp_bh))1662					BUG();1663				add_to_chunk(chunk, tmp_bh, NULL, write_chunk);1664				ret++;1665			} else {1666				/* note, cn->bh might be null now */1667				unlock_buffer(tmp_bh);1668			}1669			put_bh(tmp_bh);1670		}1671next:1672		cn = cn->next;1673		cond_resched();1674	}1675	return ret;1676}1677 1678/* used by flush_commit_list */1679static void dirty_one_transaction(struct super_block *s,1680				 struct reiserfs_journal_list *jl)1681{1682	struct reiserfs_journal_cnode *cn;1683	struct reiserfs_journal_list *pjl;1684 1685	jl->j_state |= LIST_DIRTY;1686	cn = jl->j_realblock;1687	while (cn) {1688		/*1689		 * look for a more recent transaction that logged this1690		 * buffer.  Only the most recent transaction with a buffer in1691		 * it is allowed to send that buffer to disk1692		 */1693		pjl = find_newer_jl_for_cn(cn);1694		if (!pjl && cn->blocknr && cn->bh1695		    && buffer_journal_dirty(cn->bh)) {1696			BUG_ON(!can_dirty(cn));1697			/*1698			 * if the buffer is prepared, it will either be logged1699			 * or restored.  If restored, we need to make sure1700			 * it actually gets marked dirty1701			 */1702			clear_buffer_journal_new(cn->bh);1703			if (buffer_journal_prepared(cn->bh)) {1704				set_buffer_journal_restore_dirty(cn->bh);1705			} else {1706				set_buffer_journal_test(cn->bh);1707				mark_buffer_dirty(cn->bh);1708			}1709		}1710		cn = cn->next;1711	}1712}1713 1714static int kupdate_transactions(struct super_block *s,1715				struct reiserfs_journal_list *jl,1716				struct reiserfs_journal_list **next_jl,1717				unsigned int *next_trans_id,1718				int num_blocks, int num_trans)1719{1720	int ret = 0;1721	int written = 0;1722	int transactions_flushed = 0;1723	unsigned int orig_trans_id = jl->j_trans_id;1724	struct buffer_chunk chunk;1725	struct list_head *entry;1726	struct reiserfs_journal *journal = SB_JOURNAL(s);1727	chunk.nr = 0;1728 1729	reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);1730	if (!journal_list_still_alive(s, orig_trans_id)) {1731		goto done;1732	}1733 1734	/*1735	 * we've got j_flush_mutex held, nobody is going to delete any1736	 * of these lists out from underneath us1737	 */1738	while ((num_trans && transactions_flushed < num_trans) ||1739	       (!num_trans && written < num_blocks)) {1740 1741		if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||1742		    atomic_read(&jl->j_commit_left)1743		    || !(jl->j_state & LIST_DIRTY)) {1744			del_from_work_list(s, jl);1745			break;1746		}1747		ret = write_one_transaction(s, jl, &chunk);1748 1749		if (ret < 0)1750			goto done;1751		transactions_flushed++;1752		written += ret;1753		entry = jl->j_list.next;1754 1755		/* did we wrap? */1756		if (entry == &journal->j_journal_list) {1757			break;1758		}1759		jl = JOURNAL_LIST_ENTRY(entry);1760 1761		/* don't bother with older transactions */1762		if (jl->j_trans_id <= orig_trans_id)1763			break;1764	}1765	if (chunk.nr) {1766		write_chunk(&chunk);1767	}1768 1769done:1770	mutex_unlock(&journal->j_flush_mutex);1771	return ret;1772}1773 1774/*1775 * for o_sync and fsync heavy applications, they tend to use1776 * all the journa list slots with tiny transactions.  These1777 * trigger lots and lots of calls to update the header block, which1778 * adds seeks and slows things down.1779 *1780 * This function tries to clear out a large chunk of the journal lists1781 * at once, which makes everything faster since only the newest journal1782 * list updates the header block1783 */1784static int flush_used_journal_lists(struct super_block *s,1785				    struct reiserfs_journal_list *jl)1786{1787	unsigned long len = 0;1788	unsigned long cur_len;1789	int i;1790	int limit = 256;1791	struct reiserfs_journal_list *tjl;1792	struct reiserfs_journal_list *flush_jl;1793	unsigned int trans_id;1794	struct reiserfs_journal *journal = SB_JOURNAL(s);1795 1796	flush_jl = tjl = jl;1797 1798	/* in data logging mode, try harder to flush a lot of blocks */1799	if (reiserfs_data_log(s))1800		limit = 1024;1801	/* flush for 256 transactions or limit blocks, whichever comes first */1802	for (i = 0; i < 256 && len < limit; i++) {1803		if (atomic_read(&tjl->j_commit_left) ||1804		    tjl->j_trans_id < jl->j_trans_id) {1805			break;1806		}1807		cur_len = atomic_read(&tjl->j_nonzerolen);1808		if (cur_len > 0) {1809			tjl->j_state &= ~LIST_TOUCHED;1810		}1811		len += cur_len;1812		flush_jl = tjl;1813		if (tjl->j_list.next == &journal->j_journal_list)1814			break;1815		tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);1816	}1817	get_journal_list(jl);1818	get_journal_list(flush_jl);1819 1820	/*1821	 * try to find a group of blocks we can flush across all the1822	 * transactions, but only bother if we've actually spanned1823	 * across multiple lists1824	 */1825	if (flush_jl != jl)1826		kupdate_transactions(s, jl, &tjl, &trans_id, len, i);1827 1828	flush_journal_list(s, flush_jl, 1);1829	put_journal_list(s, flush_jl);1830	put_journal_list(s, jl);1831	return 0;1832}1833 1834/*1835 * removes any nodes in table with name block and dev as bh.1836 * only touchs the hnext and hprev pointers.1837 */1838static void remove_journal_hash(struct super_block *sb,1839			 struct reiserfs_journal_cnode **table,1840			 struct reiserfs_journal_list *jl,1841			 unsigned long block, int remove_freed)1842{1843	struct reiserfs_journal_cnode *cur;1844	struct reiserfs_journal_cnode **head;1845 1846	head = &(journal_hash(table, sb, block));1847	if (!head) {1848		return;1849	}1850	cur = *head;1851	while (cur) {1852		if (cur->blocknr == block && cur->sb == sb1853		    && (jl == NULL || jl == cur->jlist)1854		    && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {1855			if (cur->hnext) {1856				cur->hnext->hprev = cur->hprev;1857			}1858			if (cur->hprev) {1859				cur->hprev->hnext = cur->hnext;1860			} else {1861				*head = cur->hnext;1862			}1863			cur->blocknr = 0;1864			cur->sb = NULL;1865			cur->state = 0;1866			/*1867			 * anybody who clears the cur->bh will also1868			 * dec the nonzerolen1869			 */1870			if (cur->bh && cur->jlist)1871				atomic_dec(&cur->jlist->j_nonzerolen);1872			cur->bh = NULL;1873			cur->jlist = NULL;1874		}1875		cur = cur->hnext;1876	}1877}1878 1879static void free_journal_ram(struct super_block *sb)1880{1881	struct reiserfs_journal *journal = SB_JOURNAL(sb);1882	kfree(journal->j_current_jl);1883	journal->j_num_lists--;1884 1885	vfree(journal->j_cnode_free_orig);1886	free_list_bitmaps(sb, journal->j_list_bitmap);1887	free_bitmap_nodes(sb);	/* must be after free_list_bitmaps */1888	if (journal->j_header_bh) {1889		brelse(journal->j_header_bh);1890	}1891	/*1892	 * j_header_bh is on the journal dev, make sure1893	 * not to release the journal dev until we brelse j_header_bh1894	 */1895	release_journal_dev(journal);1896	vfree(journal);1897}1898 1899/*1900 * call on unmount.  Only set error to 1 if you haven't made your way out1901 * of read_super() yet.  Any other caller must keep error at 0.1902 */1903static int do_journal_release(struct reiserfs_transaction_handle *th,1904			      struct super_block *sb, int error)1905{1906	struct reiserfs_transaction_handle myth;1907	struct reiserfs_journal *journal = SB_JOURNAL(sb);1908 1909	/*1910	 * we only want to flush out transactions if we were1911	 * called with error == 01912	 */1913	if (!error && !sb_rdonly(sb)) {1914		/* end the current trans */1915		BUG_ON(!th->t_trans_id);1916		do_journal_end(th, FLUSH_ALL);1917 1918		/*1919		 * make sure something gets logged to force1920		 * our way into the flush code1921		 */1922		if (!journal_join(&myth, sb)) {1923			reiserfs_prepare_for_journal(sb,1924						     SB_BUFFER_WITH_SB(sb),1925						     1);1926			journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));1927			do_journal_end(&myth, FLUSH_ALL);1928		}1929	}1930 1931	/* this also catches errors during the do_journal_end above */1932	if (!error && reiserfs_is_journal_aborted(journal)) {1933		memset(&myth, 0, sizeof(myth));1934		if (!journal_join_abort(&myth, sb)) {1935			reiserfs_prepare_for_journal(sb,1936						     SB_BUFFER_WITH_SB(sb),1937						     1);1938			journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));1939			do_journal_end(&myth, FLUSH_ALL);1940		}1941	}1942 1943 1944	/*1945	 * We must release the write lock here because1946	 * the workqueue job (flush_async_commit) needs this lock1947	 */1948	reiserfs_write_unlock(sb);1949 1950	/*1951	 * Cancel flushing of old commits. Note that neither of these works1952	 * will be requeued because superblock is being shutdown and doesn't1953	 * have SB_ACTIVE set.1954	 */1955	reiserfs_cancel_old_flush(sb);1956	/* wait for all commits to finish */1957	cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);1958 1959	free_journal_ram(sb);1960 1961	reiserfs_write_lock(sb);1962 1963	return 0;1964}1965 1966/* * call on unmount.  flush all journal trans, release all alloc'd ram */1967int journal_release(struct reiserfs_transaction_handle *th,1968		    struct super_block *sb)1969{1970	return do_journal_release(th, sb, 0);1971}1972 1973/* only call from an error condition inside reiserfs_read_super!  */1974int journal_release_error(struct reiserfs_transaction_handle *th,1975			  struct super_block *sb)1976{1977	return do_journal_release(th, sb, 1);1978}1979 1980/*1981 * compares description block with commit block.1982 * returns 1 if they differ, 0 if they are the same1983 */1984static int journal_compare_desc_commit(struct super_block *sb,1985				       struct reiserfs_journal_desc *desc,1986				       struct reiserfs_journal_commit *commit)1987{1988	if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||1989	    get_commit_trans_len(commit) != get_desc_trans_len(desc) ||1990	    get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||1991	    get_commit_trans_len(commit) <= 0) {1992		return 1;1993	}1994	return 0;1995}1996 1997/*1998 * returns 0 if it did not find a description block1999 * returns -1 if it found a corrupt commit block2000 * returns 1 if both desc and commit were valid2001 * NOTE: only called during fs mount2002 */2003static int journal_transaction_is_valid(struct super_block *sb,2004					struct buffer_head *d_bh,2005					unsigned int *oldest_invalid_trans_id,2006					unsigned long *newest_mount_id)2007{2008	struct reiserfs_journal_desc *desc;2009	struct reiserfs_journal_commit *commit;2010	struct buffer_head *c_bh;2011	unsigned long offset;2012 2013	if (!d_bh)2014		return 0;2015 2016	desc = (struct reiserfs_journal_desc *)d_bh->b_data;2017	if (get_desc_trans_len(desc) > 02018	    && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {2019		if (oldest_invalid_trans_id && *oldest_invalid_trans_id2020		    && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {2021			reiserfs_debug(sb, REISERFS_DEBUG_CODE,2022				       "journal-986: transaction "2023				       "is valid returning because trans_id %d is greater than "2024				       "oldest_invalid %lu",2025				       get_desc_trans_id(desc),2026				       *oldest_invalid_trans_id);2027			return 0;2028		}2029		if (newest_mount_id2030		    && *newest_mount_id > get_desc_mount_id(desc)) {2031			reiserfs_debug(sb, REISERFS_DEBUG_CODE,2032				       "journal-1087: transaction "2033				       "is valid returning because mount_id %d is less than "2034				       "newest_mount_id %lu",2035				       get_desc_mount_id(desc),2036				       *newest_mount_id);2037			return -1;2038		}2039		if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {2040			reiserfs_warning(sb, "journal-2018",2041					 "Bad transaction length %d "2042					 "encountered, ignoring transaction",2043					 get_desc_trans_len(desc));2044			return -1;2045		}2046		offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);2047 2048		/*2049		 * ok, we have a journal description block,2050		 * let's see if the transaction was valid2051		 */2052		c_bh =2053		    journal_bread(sb,2054				  SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2055				  ((offset + get_desc_trans_len(desc) +2056				    1) % SB_ONDISK_JOURNAL_SIZE(sb)));2057		if (!c_bh)2058			return 0;2059		commit = (struct reiserfs_journal_commit *)c_bh->b_data;2060		if (journal_compare_desc_commit(sb, desc, commit)) {2061			reiserfs_debug(sb, REISERFS_DEBUG_CODE,2062				       "journal_transaction_is_valid, commit offset %ld had bad "2063				       "time %d or length %d",2064				       c_bh->b_blocknr -2065				       SB_ONDISK_JOURNAL_1st_BLOCK(sb),2066				       get_commit_trans_id(commit),2067				       get_commit_trans_len(commit));2068			brelse(c_bh);2069			if (oldest_invalid_trans_id) {2070				*oldest_invalid_trans_id =2071				    get_desc_trans_id(desc);2072				reiserfs_debug(sb, REISERFS_DEBUG_CODE,2073					       "journal-1004: "2074					       "transaction_is_valid setting oldest invalid trans_id "2075					       "to %d",2076					       get_desc_trans_id(desc));2077			}2078			return -1;2079		}2080		brelse(c_bh);2081		reiserfs_debug(sb, REISERFS_DEBUG_CODE,2082			       "journal-1006: found valid "2083			       "transaction start offset %llu, len %d id %d",2084			       d_bh->b_blocknr -2085			       SB_ONDISK_JOURNAL_1st_BLOCK(sb),2086			       get_desc_trans_len(desc),2087			       get_desc_trans_id(desc));2088		return 1;2089	} else {2090		return 0;2091	}2092}2093 2094static void brelse_array(struct buffer_head **heads, int num)2095{2096	int i;2097	for (i = 0; i < num; i++) {2098		brelse(heads[i]);2099	}2100}2101 2102/*2103 * given the start, and values for the oldest acceptable transactions,2104 * this either reads in a replays a transaction, or returns because the2105 * transaction is invalid, or too old.2106 * NOTE: only called during fs mount2107 */2108static int journal_read_transaction(struct super_block *sb,2109				    unsigned long cur_dblock,2110				    unsigned long oldest_start,2111				    unsigned int oldest_trans_id,2112				    unsigned long newest_mount_id)2113{2114	struct reiserfs_journal *journal = SB_JOURNAL(sb);2115	struct reiserfs_journal_desc *desc;2116	struct reiserfs_journal_commit *commit;2117	unsigned int trans_id = 0;2118	struct buffer_head *c_bh;2119	struct buffer_head *d_bh;2120	struct buffer_head **log_blocks = NULL;2121	struct buffer_head **real_blocks = NULL;2122	unsigned int trans_offset;2123	int i;2124	int trans_half;2125 2126	d_bh = journal_bread(sb, cur_dblock);2127	if (!d_bh)2128		return 1;2129	desc = (struct reiserfs_journal_desc *)d_bh->b_data;2130	trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);2131	reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "2132		       "journal_read_transaction, offset %llu, len %d mount_id %d",2133		       d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),2134		       get_desc_trans_len(desc), get_desc_mount_id(desc));2135	if (get_desc_trans_id(desc) < oldest_trans_id) {2136		reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "2137			       "journal_read_trans skipping because %lu is too old",2138			       cur_dblock -2139			       SB_ONDISK_JOURNAL_1st_BLOCK(sb));2140		brelse(d_bh);2141		return 1;2142	}2143	if (get_desc_mount_id(desc) != newest_mount_id) {2144		reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "2145			       "journal_read_trans skipping because %d is != "2146			       "newest_mount_id %lu", get_desc_mount_id(desc),2147			       newest_mount_id);2148		brelse(d_bh);2149		return 1;2150	}2151	c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2152			     ((trans_offset + get_desc_trans_len(desc) + 1) %2153			      SB_ONDISK_JOURNAL_SIZE(sb)));2154	if (!c_bh) {2155		brelse(d_bh);2156		return 1;2157	}2158	commit = (struct reiserfs_journal_commit *)c_bh->b_data;2159	if (journal_compare_desc_commit(sb, desc, commit)) {2160		reiserfs_debug(sb, REISERFS_DEBUG_CODE,2161			       "journal_read_transaction, "2162			       "commit offset %llu had bad time %d or length %d",2163			       c_bh->b_blocknr -2164			       SB_ONDISK_JOURNAL_1st_BLOCK(sb),2165			       get_commit_trans_id(commit),2166			       get_commit_trans_len(commit));2167		brelse(c_bh);2168		brelse(d_bh);2169		return 1;2170	}2171 2172	if (bdev_read_only(sb->s_bdev)) {2173		reiserfs_warning(sb, "clm-2076",2174				 "device is readonly, unable to replay log");2175		brelse(c_bh);2176		brelse(d_bh);2177		return -EROFS;2178	}2179 2180	trans_id = get_desc_trans_id(desc);2181	/*2182	 * now we know we've got a good transaction, and it was2183	 * inside the valid time ranges2184	 */2185	log_blocks = kmalloc_array(get_desc_trans_len(desc),2186				   sizeof(struct buffer_head *),2187				   GFP_NOFS);2188	real_blocks = kmalloc_array(get_desc_trans_len(desc),2189				    sizeof(struct buffer_head *),2190				    GFP_NOFS);2191	if (!log_blocks || !real_blocks) {2192		brelse(c_bh);2193		brelse(d_bh);2194		kfree(log_blocks);2195		kfree(real_blocks);2196		reiserfs_warning(sb, "journal-1169",2197				 "kmalloc failed, unable to mount FS");2198		return -1;2199	}2200	/* get all the buffer heads */2201	trans_half = journal_trans_half(sb->s_blocksize);2202	for (i = 0; i < get_desc_trans_len(desc); i++) {2203		log_blocks[i] =2204		    journal_getblk(sb,2205				   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2206				   (trans_offset + 1 +2207				    i) % SB_ONDISK_JOURNAL_SIZE(sb));2208		if (i < trans_half) {2209			real_blocks[i] =2210			    sb_getblk(sb,2211				      le32_to_cpu(desc->j_realblock[i]));2212		} else {2213			real_blocks[i] =2214			    sb_getblk(sb,2215				      le32_to_cpu(commit->2216						  j_realblock[i - trans_half]));2217		}2218		if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {2219			reiserfs_warning(sb, "journal-1207",2220					 "REPLAY FAILURE fsck required! "2221					 "Block to replay is outside of "2222					 "filesystem");2223			goto abort_replay;2224		}2225		/* make sure we don't try to replay onto log or reserved area */2226		if (is_block_in_log_or_reserved_area2227		    (sb, real_blocks[i]->b_blocknr)) {2228			reiserfs_warning(sb, "journal-1204",2229					 "REPLAY FAILURE fsck required! "2230					 "Trying to replay onto a log block");2231abort_replay:2232			brelse_array(log_blocks, i);2233			brelse_array(real_blocks, i);2234			brelse(c_bh);2235			brelse(d_bh);2236			kfree(log_blocks);2237			kfree(real_blocks);2238			return -1;2239		}2240	}2241	/* read in the log blocks, memcpy to the corresponding real block */2242	bh_read_batch(get_desc_trans_len(desc), log_blocks);2243	for (i = 0; i < get_desc_trans_len(desc); i++) {2244 2245		wait_on_buffer(log_blocks[i]);2246		if (!buffer_uptodate(log_blocks[i])) {2247			reiserfs_warning(sb, "journal-1212",2248					 "REPLAY FAILURE fsck required! "2249					 "buffer write failed");2250			brelse_array(log_blocks + i,2251				     get_desc_trans_len(desc) - i);2252			brelse_array(real_blocks, get_desc_trans_len(desc));2253			brelse(c_bh);2254			brelse(d_bh);2255			kfree(log_blocks);2256			kfree(real_blocks);2257			return -1;2258		}2259		memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,2260		       real_blocks[i]->b_size);2261		set_buffer_uptodate(real_blocks[i]);2262		brelse(log_blocks[i]);2263	}2264	/* flush out the real blocks */2265	for (i = 0; i < get_desc_trans_len(desc); i++) {2266		set_buffer_dirty(real_blocks[i]);2267		write_dirty_buffer(real_blocks[i], 0);2268	}2269	for (i = 0; i < get_desc_trans_len(desc); i++) {2270		wait_on_buffer(real_blocks[i]);2271		if (!buffer_uptodate(real_blocks[i])) {2272			reiserfs_warning(sb, "journal-1226",2273					 "REPLAY FAILURE, fsck required! "2274					 "buffer write failed");2275			brelse_array(real_blocks + i,2276				     get_desc_trans_len(desc) - i);2277			brelse(c_bh);2278			brelse(d_bh);2279			kfree(log_blocks);2280			kfree(real_blocks);2281			return -1;2282		}2283		brelse(real_blocks[i]);2284	}2285	cur_dblock =2286	    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2287	    ((trans_offset + get_desc_trans_len(desc) +2288	      2) % SB_ONDISK_JOURNAL_SIZE(sb));2289	reiserfs_debug(sb, REISERFS_DEBUG_CODE,2290		       "journal-1095: setting journal " "start to offset %ld",2291		       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));2292 2293	/*2294	 * init starting values for the first transaction, in case2295	 * this is the last transaction to be replayed.2296	 */2297	journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);2298	journal->j_last_flush_trans_id = trans_id;2299	journal->j_trans_id = trans_id + 1;2300	/* check for trans_id overflow */2301	if (journal->j_trans_id == 0)2302		journal->j_trans_id = 10;2303	brelse(c_bh);2304	brelse(d_bh);2305	kfree(log_blocks);2306	kfree(real_blocks);2307	return 0;2308}2309 2310/*2311 * This function reads blocks starting from block and to max_block of bufsize2312 * size (but no more than BUFNR blocks at a time). This proved to improve2313 * mounting speed on self-rebuilding raid5 arrays at least.2314 * Right now it is only used from journal code. But later we might use it2315 * from other places.2316 * Note: Do not use journal_getblk/sb_getblk functions here!2317 */2318static struct buffer_head *reiserfs_breada(struct block_device *dev,2319					   b_blocknr_t block, int bufsize,2320					   b_blocknr_t max_block)2321{2322	struct buffer_head *bhlist[BUFNR];2323	unsigned int blocks = BUFNR;2324	struct buffer_head *bh;2325	int i, j;2326 2327	bh = __getblk(dev, block, bufsize);2328	if (!bh || buffer_uptodate(bh))2329		return (bh);2330 2331	if (block + BUFNR > max_block) {2332		blocks = max_block - block;2333	}2334	bhlist[0] = bh;2335	j = 1;2336	for (i = 1; i < blocks; i++) {2337		bh = __getblk(dev, block + i, bufsize);2338		if (!bh)2339			break;2340		if (buffer_uptodate(bh)) {2341			brelse(bh);2342			break;2343		} else2344			bhlist[j++] = bh;2345	}2346	bh = bhlist[0];2347	bh_read_nowait(bh, 0);2348	bh_readahead_batch(j - 1, &bhlist[1], 0);2349	for (i = 1; i < j; i++)2350		brelse(bhlist[i]);2351	wait_on_buffer(bh);2352	if (buffer_uptodate(bh))2353		return bh;2354	brelse(bh);2355	return NULL;2356}2357 2358/*2359 * read and replay the log2360 * on a clean unmount, the journal header's next unflushed pointer will be2361 * to an invalid transaction.  This tests that before finding all the2362 * transactions in the log, which makes normal mount times fast.2363 *2364 * After a crash, this starts with the next unflushed transaction, and2365 * replays until it finds one too old, or invalid.2366 *2367 * On exit, it sets things up so the first transaction will work correctly.2368 * NOTE: only called during fs mount2369 */2370static int journal_read(struct super_block *sb)2371{2372	struct reiserfs_journal *journal = SB_JOURNAL(sb);2373	struct reiserfs_journal_desc *desc;2374	unsigned int oldest_trans_id = 0;2375	unsigned int oldest_invalid_trans_id = 0;2376	time64_t start;2377	unsigned long oldest_start = 0;2378	unsigned long cur_dblock = 0;2379	unsigned long newest_mount_id = 9;2380	struct buffer_head *d_bh;2381	struct reiserfs_journal_header *jh;2382	int valid_journal_header = 0;2383	int replay_count = 0;2384	int continue_replay = 1;2385	int ret;2386 2387	cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);2388	reiserfs_info(sb, "checking transaction log (%pg)\n",2389		      file_bdev(journal->j_bdev_file));2390	start = ktime_get_seconds();2391 2392	/*2393	 * step 1, read in the journal header block.  Check the transaction2394	 * it says is the first unflushed, and if that transaction is not2395	 * valid, replay is done2396	 */2397	journal->j_header_bh = journal_bread(sb,2398					     SB_ONDISK_JOURNAL_1st_BLOCK(sb)2399					     + SB_ONDISK_JOURNAL_SIZE(sb));2400	if (!journal->j_header_bh) {2401		return 1;2402	}2403	jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);2404	if (le32_to_cpu(jh->j_first_unflushed_offset) <2405	    SB_ONDISK_JOURNAL_SIZE(sb)2406	    && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {2407		oldest_start =2408		    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2409		    le32_to_cpu(jh->j_first_unflushed_offset);2410		oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;2411		newest_mount_id = le32_to_cpu(jh->j_mount_id);2412		reiserfs_debug(sb, REISERFS_DEBUG_CODE,2413			       "journal-1153: found in "2414			       "header: first_unflushed_offset %d, last_flushed_trans_id "2415			       "%lu", le32_to_cpu(jh->j_first_unflushed_offset),2416			       le32_to_cpu(jh->j_last_flush_trans_id));2417		valid_journal_header = 1;2418 2419		/*2420		 * now, we try to read the first unflushed offset.  If it2421		 * is not valid, there is nothing more we can do, and it2422		 * makes no sense to read through the whole log.2423		 */2424		d_bh =2425		    journal_bread(sb,2426				  SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2427				  le32_to_cpu(jh->j_first_unflushed_offset));2428		ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);2429		if (!ret) {2430			continue_replay = 0;2431		}2432		brelse(d_bh);2433		goto start_log_replay;2434	}2435 2436	/*2437	 * ok, there are transactions that need to be replayed.  start2438	 * with the first log block, find all the valid transactions, and2439	 * pick out the oldest.2440	 */2441	while (continue_replay2442	       && cur_dblock <2443	       (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2444		SB_ONDISK_JOURNAL_SIZE(sb))) {2445		/*2446		 * Note that it is required for blocksize of primary fs2447		 * device and journal device to be the same2448		 */2449		d_bh =2450		    reiserfs_breada(file_bdev(journal->j_bdev_file), cur_dblock,2451				    sb->s_blocksize,2452				    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2453				    SB_ONDISK_JOURNAL_SIZE(sb));2454		ret =2455		    journal_transaction_is_valid(sb, d_bh,2456						 &oldest_invalid_trans_id,2457						 &newest_mount_id);2458		if (ret == 1) {2459			desc = (struct reiserfs_journal_desc *)d_bh->b_data;2460			if (oldest_start == 0) {	/* init all oldest_ values */2461				oldest_trans_id = get_desc_trans_id(desc);2462				oldest_start = d_bh->b_blocknr;2463				newest_mount_id = get_desc_mount_id(desc);2464				reiserfs_debug(sb, REISERFS_DEBUG_CODE,2465					       "journal-1179: Setting "2466					       "oldest_start to offset %llu, trans_id %lu",2467					       oldest_start -2468					       SB_ONDISK_JOURNAL_1st_BLOCK2469					       (sb), oldest_trans_id);2470			} else if (oldest_trans_id > get_desc_trans_id(desc)) {2471				/* one we just read was older */2472				oldest_trans_id = get_desc_trans_id(desc);2473				oldest_start = d_bh->b_blocknr;2474				reiserfs_debug(sb, REISERFS_DEBUG_CODE,2475					       "journal-1180: Resetting "2476					       "oldest_start to offset %lu, trans_id %lu",2477					       oldest_start -2478					       SB_ONDISK_JOURNAL_1st_BLOCK2479					       (sb), oldest_trans_id);2480			}2481			if (newest_mount_id < get_desc_mount_id(desc)) {2482				newest_mount_id = get_desc_mount_id(desc);2483				reiserfs_debug(sb, REISERFS_DEBUG_CODE,2484					       "journal-1299: Setting "2485					       "newest_mount_id to %d",2486					       get_desc_mount_id(desc));2487			}2488			cur_dblock += get_desc_trans_len(desc) + 2;2489		} else {2490			cur_dblock++;2491		}2492		brelse(d_bh);2493	}2494 2495start_log_replay:2496	cur_dblock = oldest_start;2497	if (oldest_trans_id) {2498		reiserfs_debug(sb, REISERFS_DEBUG_CODE,2499			       "journal-1206: Starting replay "2500			       "from offset %llu, trans_id %lu",2501			       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),2502			       oldest_trans_id);2503 2504	}2505	replay_count = 0;2506	while (continue_replay && oldest_trans_id > 0) {2507		ret =2508		    journal_read_transaction(sb, cur_dblock, oldest_start,2509					     oldest_trans_id, newest_mount_id);2510		if (ret < 0) {2511			return ret;2512		} else if (ret != 0) {2513			break;2514		}2515		cur_dblock =2516		    SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;2517		replay_count++;2518		if (cur_dblock == oldest_start)2519			break;2520	}2521 2522	if (oldest_trans_id == 0) {2523		reiserfs_debug(sb, REISERFS_DEBUG_CODE,2524			       "journal-1225: No valid " "transactions found");2525	}2526	/*2527	 * j_start does not get set correctly if we don't replay any2528	 * transactions.  if we had a valid journal_header, set j_start2529	 * to the first unflushed transaction value, copy the trans_id2530	 * from the header2531	 */2532	if (valid_journal_header && replay_count == 0) {2533		journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);2534		journal->j_trans_id =2535		    le32_to_cpu(jh->j_last_flush_trans_id) + 1;2536		/* check for trans_id overflow */2537		if (journal->j_trans_id == 0)2538			journal->j_trans_id = 10;2539		journal->j_last_flush_trans_id =2540		    le32_to_cpu(jh->j_last_flush_trans_id);2541		journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;2542	} else {2543		journal->j_mount_id = newest_mount_id + 1;2544	}2545	reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "2546		       "newest_mount_id to %lu", journal->j_mount_id);2547	journal->j_first_unflushed_offset = journal->j_start;2548	if (replay_count > 0) {2549		reiserfs_info(sb,2550			      "replayed %d transactions in %lu seconds\n",2551			      replay_count, ktime_get_seconds() - start);2552	}2553	/* needed to satisfy the locking in _update_journal_header_block */2554	reiserfs_write_lock(sb);2555	if (!bdev_read_only(sb->s_bdev) &&2556	    _update_journal_header_block(sb, journal->j_start,2557					 journal->j_last_flush_trans_id)) {2558		reiserfs_write_unlock(sb);2559		/*2560		 * replay failed, caller must call free_journal_ram and abort2561		 * the mount2562		 */2563		return -1;2564	}2565	reiserfs_write_unlock(sb);2566	return 0;2567}2568 2569static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)2570{2571	struct reiserfs_journal_list *jl;2572	jl = kzalloc(sizeof(struct reiserfs_journal_list),2573		     GFP_NOFS | __GFP_NOFAIL);2574	INIT_LIST_HEAD(&jl->j_list);2575	INIT_LIST_HEAD(&jl->j_working_list);2576	INIT_LIST_HEAD(&jl->j_tail_bh_list);2577	INIT_LIST_HEAD(&jl->j_bh_list);2578	mutex_init(&jl->j_commit_mutex);2579	SB_JOURNAL(s)->j_num_lists++;2580	get_journal_list(jl);2581	return jl;2582}2583 2584static void journal_list_init(struct super_block *sb)2585{2586	SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);2587}2588 2589static void release_journal_dev(struct reiserfs_journal *journal)2590{2591	if (journal->j_bdev_file) {2592		bdev_fput(journal->j_bdev_file);2593		journal->j_bdev_file = NULL;2594	}2595}2596 2597static int journal_init_dev(struct super_block *super,2598			    struct reiserfs_journal *journal,2599			    const char *jdev_name)2600{2601	blk_mode_t blkdev_mode = BLK_OPEN_READ;2602	void *holder = journal;2603	int result;2604	dev_t jdev;2605 2606	result = 0;2607 2608	journal->j_bdev_file = NULL;2609	jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?2610	    new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;2611 2612	if (!bdev_read_only(super->s_bdev))2613		blkdev_mode |= BLK_OPEN_WRITE;2614 2615	/* there is no "jdev" option and journal is on separate device */2616	if ((!jdev_name || !jdev_name[0])) {2617		if (jdev == super->s_dev)2618			holder = NULL;2619		journal->j_bdev_file = bdev_file_open_by_dev(jdev, blkdev_mode,2620							  holder, NULL);2621		if (IS_ERR(journal->j_bdev_file)) {2622			result = PTR_ERR(journal->j_bdev_file);2623			journal->j_bdev_file = NULL;2624			reiserfs_warning(super, "sh-458",2625					 "cannot init journal device unknown-block(%u,%u): %i",2626					 MAJOR(jdev), MINOR(jdev), result);2627			return result;2628		} else if (jdev != super->s_dev)2629			set_blocksize(journal->j_bdev_file, super->s_blocksize);2630 2631		return 0;2632	}2633 2634	journal->j_bdev_file = bdev_file_open_by_path(jdev_name, blkdev_mode,2635						   holder, NULL);2636	if (IS_ERR(journal->j_bdev_file)) {2637		result = PTR_ERR(journal->j_bdev_file);2638		journal->j_bdev_file = NULL;2639		reiserfs_warning(super, "sh-457",2640				 "journal_init_dev: Cannot open '%s': %i",2641				 jdev_name, result);2642		return result;2643	}2644 2645	set_blocksize(journal->j_bdev_file, super->s_blocksize);2646	reiserfs_info(super,2647		      "journal_init_dev: journal device: %pg\n",2648		      file_bdev(journal->j_bdev_file));2649	return 0;2650}2651 2652/*2653 * When creating/tuning a file system user can assign some2654 * journal params within boundaries which depend on the ratio2655 * blocksize/standard_blocksize.2656 *2657 * For blocks >= standard_blocksize transaction size should2658 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more2659 * then JOURNAL_TRANS_MAX_DEFAULT.2660 *2661 * For blocks < standard_blocksize these boundaries should be2662 * decreased proportionally.2663 */2664#define REISERFS_STANDARD_BLKSIZE (4096)2665 2666static int check_advise_trans_params(struct super_block *sb,2667				     struct reiserfs_journal *journal)2668{2669        if (journal->j_trans_max) {2670		/* Non-default journal params.  Do sanity check for them. */2671	        int ratio = 1;2672		if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)2673		        ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;2674 2675		if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||2676		    journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||2677		    SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <2678		    JOURNAL_MIN_RATIO) {2679			reiserfs_warning(sb, "sh-462",2680					 "bad transaction max size (%u). "2681					 "FSCK?", journal->j_trans_max);2682			return 1;2683		}2684		if (journal->j_max_batch != (journal->j_trans_max) *2685		        JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {2686			reiserfs_warning(sb, "sh-463",2687					 "bad transaction max batch (%u). "2688					 "FSCK?", journal->j_max_batch);2689			return 1;2690		}2691	} else {2692		/*2693		 * Default journal params.2694		 * The file system was created by old version2695		 * of mkreiserfs, so some fields contain zeros,2696		 * and we need to advise proper values for them2697		 */2698		if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {2699			reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",2700					 sb->s_blocksize);2701			return 1;2702		}2703		journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;2704		journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;2705		journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;2706	}2707	return 0;2708}2709 2710/* must be called once on fs mount.  calls journal_read for you */2711int journal_init(struct super_block *sb, const char *j_dev_name,2712		 int old_format, unsigned int commit_max_age)2713{2714	int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;2715	struct buffer_head *bhjh;2716	struct reiserfs_super_block *rs;2717	struct reiserfs_journal_header *jh;2718	struct reiserfs_journal *journal;2719	struct reiserfs_journal_list *jl;2720	int ret;2721 2722	journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));2723	if (!journal) {2724		reiserfs_warning(sb, "journal-1256",2725				 "unable to get memory for journal structure");2726		return 1;2727	}2728	INIT_LIST_HEAD(&journal->j_bitmap_nodes);2729	INIT_LIST_HEAD(&journal->j_prealloc_list);2730	INIT_LIST_HEAD(&journal->j_working_list);2731	INIT_LIST_HEAD(&journal->j_journal_list);2732	journal->j_persistent_trans = 0;2733	if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,2734					   reiserfs_bmap_count(sb)))2735		goto free_and_return;2736 2737	allocate_bitmap_nodes(sb);2738 2739	/* reserved for journal area support */2740	SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?2741						 REISERFS_OLD_DISK_OFFSET_IN_BYTES2742						 / sb->s_blocksize +2743						 reiserfs_bmap_count(sb) +2744						 1 :2745						 REISERFS_DISK_OFFSET_IN_BYTES /2746						 sb->s_blocksize + 2);2747 2748	/*2749	 * Sanity check to see is the standard journal fitting2750	 * within first bitmap (actual for small blocksizes)2751	 */2752	if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&2753	    (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +2754	     SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {2755		reiserfs_warning(sb, "journal-1393",2756				 "journal does not fit for area addressed "2757				 "by first of bitmap blocks. It starts at "2758				 "%u and its size is %u. Block size %ld",2759				 SB_JOURNAL_1st_RESERVED_BLOCK(sb),2760				 SB_ONDISK_JOURNAL_SIZE(sb),2761				 sb->s_blocksize);2762		goto free_and_return;2763	}2764 2765	/*2766	 * Sanity check to see if journal first block is correct.2767	 * If journal first block is invalid it can cause2768	 * zeroing important superblock members.2769	 */2770	if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&2771	    SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {2772		reiserfs_warning(sb, "journal-1393",2773				 "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",2774				 SB_JOURNAL_1st_RESERVED_BLOCK(sb),2775				 SB_ONDISK_JOURNAL_1st_BLOCK(sb));2776		goto free_and_return;2777	}2778 2779	if (journal_init_dev(sb, journal, j_dev_name) != 0) {2780		reiserfs_warning(sb, "sh-462",2781				 "unable to initialize journal device");2782		goto free_and_return;2783	}2784 2785	rs = SB_DISK_SUPER_BLOCK(sb);2786 2787	/* read journal header */2788	bhjh = journal_bread(sb,2789			     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +2790			     SB_ONDISK_JOURNAL_SIZE(sb));2791	if (!bhjh) {2792		reiserfs_warning(sb, "sh-459",2793				 "unable to read journal header");2794		goto free_and_return;2795	}2796	jh = (struct reiserfs_journal_header *)(bhjh->b_data);2797 2798	/* make sure that journal matches to the super block */2799	if (is_reiserfs_jr(rs)2800	    && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=2801		sb_jp_journal_magic(rs))) {2802		reiserfs_warning(sb, "sh-460",2803				 "journal header magic %x (device %pg) does "2804				 "not match to magic found in super block %x",2805				 jh->jh_journal.jp_journal_magic,2806				 file_bdev(journal->j_bdev_file),2807				 sb_jp_journal_magic(rs));2808		brelse(bhjh);2809		goto free_and_return;2810	}2811 2812	journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);2813	journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);2814	journal->j_max_commit_age =2815	    le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);2816	journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;2817 2818	if (check_advise_trans_params(sb, journal) != 0)2819	        goto free_and_return;2820	journal->j_default_max_commit_age = journal->j_max_commit_age;2821 2822	if (commit_max_age != 0) {2823		journal->j_max_commit_age = commit_max_age;2824		journal->j_max_trans_age = commit_max_age;2825	}2826 2827	reiserfs_info(sb, "journal params: device %pg, size %u, "2828		      "journal first block %u, max trans len %u, max batch %u, "2829		      "max commit age %u, max trans age %u\n",2830		      file_bdev(journal->j_bdev_file),2831		      SB_ONDISK_JOURNAL_SIZE(sb),2832		      SB_ONDISK_JOURNAL_1st_BLOCK(sb),2833		      journal->j_trans_max,2834		      journal->j_max_batch,2835		      journal->j_max_commit_age, journal->j_max_trans_age);2836 2837	brelse(bhjh);2838 2839	journal->j_list_bitmap_index = 0;2840	journal_list_init(sb);2841 2842	memset(journal->j_list_hash_table, 0,2843	       JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));2844 2845	INIT_LIST_HEAD(&journal->j_dirty_buffers);2846	spin_lock_init(&journal->j_dirty_buffers_lock);2847 2848	journal->j_start = 0;2849	journal->j_len = 0;2850	journal->j_len_alloc = 0;2851	atomic_set(&journal->j_wcount, 0);2852	atomic_set(&journal->j_async_throttle, 0);2853	journal->j_bcount = 0;2854	journal->j_trans_start_time = 0;2855	journal->j_last = NULL;2856	journal->j_first = NULL;2857	init_waitqueue_head(&journal->j_join_wait);2858	mutex_init(&journal->j_mutex);2859	mutex_init(&journal->j_flush_mutex);2860 2861	journal->j_trans_id = 10;2862	journal->j_mount_id = 10;2863	journal->j_state = 0;2864	atomic_set(&journal->j_jlock, 0);2865	journal->j_cnode_free_list = allocate_cnodes(num_cnodes);2866	journal->j_cnode_free_orig = journal->j_cnode_free_list;2867	journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;2868	journal->j_cnode_used = 0;2869	journal->j_must_wait = 0;2870 2871	if (journal->j_cnode_free == 0) {2872		reiserfs_warning(sb, "journal-2004", "Journal cnode memory "2873		                 "allocation failed (%ld bytes). Journal is "2874		                 "too large for available memory. Usually "2875		                 "this is due to a journal that is too large.",2876		                 sizeof (struct reiserfs_journal_cnode) * num_cnodes);2877        	goto free_and_return;2878	}2879 2880	init_journal_hash(sb);2881	jl = journal->j_current_jl;2882 2883	/*2884	 * get_list_bitmap() may call flush_commit_list() which2885	 * requires the lock. Calling flush_commit_list() shouldn't happen2886	 * this early but I like to be paranoid.2887	 */2888	reiserfs_write_lock(sb);2889	jl->j_list_bitmap = get_list_bitmap(sb, jl);2890	reiserfs_write_unlock(sb);2891	if (!jl->j_list_bitmap) {2892		reiserfs_warning(sb, "journal-2005",2893				 "get_list_bitmap failed for journal list 0");2894		goto free_and_return;2895	}2896 2897	ret = journal_read(sb);2898	if (ret < 0) {2899		reiserfs_warning(sb, "reiserfs-2006",2900				 "Replay Failure, unable to mount");2901		goto free_and_return;2902	}2903 2904	INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);2905	journal->j_work_sb = sb;2906	return 0;2907free_and_return:2908	free_journal_ram(sb);2909	return 1;2910}2911 2912/*2913 * test for a polite end of the current transaction.  Used by file_write,2914 * and should be used by delete to make sure they don't write more than2915 * can fit inside a single transaction2916 */2917int journal_transaction_should_end(struct reiserfs_transaction_handle *th,2918				   int new_alloc)2919{2920	struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);2921	time64_t now = ktime_get_seconds();2922	/* cannot restart while nested */2923	BUG_ON(!th->t_trans_id);2924	if (th->t_refcount > 1)2925		return 0;2926	if (journal->j_must_wait > 0 ||2927	    (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||2928	    atomic_read(&journal->j_jlock) ||2929	    (now - journal->j_trans_start_time) > journal->j_max_trans_age ||2930	    journal->j_cnode_free < (journal->j_trans_max * 3)) {2931		return 1;2932	}2933 2934	journal->j_len_alloc += new_alloc;2935	th->t_blocks_allocated += new_alloc ;2936	return 0;2937}2938 2939/* this must be called inside a transaction */2940void reiserfs_block_writes(struct reiserfs_transaction_handle *th)2941{2942	struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);2943	BUG_ON(!th->t_trans_id);2944	journal->j_must_wait = 1;2945	set_bit(J_WRITERS_BLOCKED, &journal->j_state);2946	return;2947}2948 2949/* this must be called without a transaction started */2950void reiserfs_allow_writes(struct super_block *s)2951{2952	struct reiserfs_journal *journal = SB_JOURNAL(s);2953	clear_bit(J_WRITERS_BLOCKED, &journal->j_state);2954	wake_up(&journal->j_join_wait);2955}2956 2957/* this must be called without a transaction started */2958void reiserfs_wait_on_write_block(struct super_block *s)2959{2960	struct reiserfs_journal *journal = SB_JOURNAL(s);2961	wait_event(journal->j_join_wait,2962		   !test_bit(J_WRITERS_BLOCKED, &journal->j_state));2963}2964 2965static void queue_log_writer(struct super_block *s)2966{2967	wait_queue_entry_t wait;2968	struct reiserfs_journal *journal = SB_JOURNAL(s);2969	set_bit(J_WRITERS_QUEUED, &journal->j_state);2970 2971	/*2972	 * we don't want to use wait_event here because2973	 * we only want to wait once.2974	 */2975	init_waitqueue_entry(&wait, current);2976	add_wait_queue(&journal->j_join_wait, &wait);2977	set_current_state(TASK_UNINTERRUPTIBLE);2978	if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {2979		int depth = reiserfs_write_unlock_nested(s);2980		schedule();2981		reiserfs_write_lock_nested(s, depth);2982	}2983	__set_current_state(TASK_RUNNING);2984	remove_wait_queue(&journal->j_join_wait, &wait);2985}2986 2987static void wake_queued_writers(struct super_block *s)2988{2989	struct reiserfs_journal *journal = SB_JOURNAL(s);2990	if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))2991		wake_up(&journal->j_join_wait);2992}2993 2994static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)2995{2996	struct reiserfs_journal *journal = SB_JOURNAL(sb);2997	unsigned long bcount = journal->j_bcount;2998	while (1) {2999		int depth;3000 3001		depth = reiserfs_write_unlock_nested(sb);3002		schedule_timeout_uninterruptible(1);3003		reiserfs_write_lock_nested(sb, depth);3004 3005		journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;3006		while ((atomic_read(&journal->j_wcount) > 0 ||3007			atomic_read(&journal->j_jlock)) &&3008		       journal->j_trans_id == trans_id) {3009			queue_log_writer(sb);3010		}3011		if (journal->j_trans_id != trans_id)3012			break;3013		if (bcount == journal->j_bcount)3014			break;3015		bcount = journal->j_bcount;3016	}3017}3018 3019/*3020 * join == true if you must join an existing transaction.3021 * join == false if you can deal with waiting for others to finish3022 *3023 * this will block until the transaction is joinable.  send the number of3024 * blocks you expect to use in nblocks.3025*/3026static int do_journal_begin_r(struct reiserfs_transaction_handle *th,3027			      struct super_block *sb, unsigned long nblocks,3028			      int join)3029{3030	time64_t now = ktime_get_seconds();3031	unsigned int old_trans_id;3032	struct reiserfs_journal *journal = SB_JOURNAL(sb);3033	struct reiserfs_transaction_handle myth;3034	int retval;3035	int depth;3036 3037	reiserfs_check_lock_depth(sb, "journal_begin");3038	BUG_ON(nblocks > journal->j_trans_max);3039 3040	PROC_INFO_INC(sb, journal.journal_being);3041	/* set here for journal_join */3042	th->t_refcount = 1;3043	th->t_super = sb;3044 3045relock:3046	lock_journal(sb);3047	if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {3048		unlock_journal(sb);3049		retval = journal->j_errno;3050		goto out_fail;3051	}3052	journal->j_bcount++;3053 3054	if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {3055		unlock_journal(sb);3056		depth = reiserfs_write_unlock_nested(sb);3057		reiserfs_wait_on_write_block(sb);3058		reiserfs_write_lock_nested(sb, depth);3059		PROC_INFO_INC(sb, journal.journal_relock_writers);3060		goto relock;3061	}3062	now = ktime_get_seconds();3063 3064	/*3065	 * if there is no room in the journal OR3066	 * if this transaction is too old, and we weren't called joinable,3067	 * wait for it to finish before beginning we don't sleep if there3068	 * aren't other writers3069	 */3070 3071	if ((!join && journal->j_must_wait > 0) ||3072	    (!join3073	     && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)3074	    || (!join && atomic_read(&journal->j_wcount) > 03075		&& journal->j_trans_start_time > 03076		&& (now - journal->j_trans_start_time) >3077		journal->j_max_trans_age) || (!join3078					      && atomic_read(&journal->j_jlock))3079	    || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {3080 3081		old_trans_id = journal->j_trans_id;3082		/* allow others to finish this transaction */3083		unlock_journal(sb);3084 3085		if (!join && (journal->j_len_alloc + nblocks + 2) >=3086		    journal->j_max_batch &&3087		    ((journal->j_len + nblocks + 2) * 100) <3088		    (journal->j_len_alloc * 75)) {3089			if (atomic_read(&journal->j_wcount) > 10) {3090				queue_log_writer(sb);3091				goto relock;3092			}3093		}3094		/*3095		 * don't mess with joining the transaction if all we3096		 * have to do is wait for someone else to do a commit3097		 */3098		if (atomic_read(&journal->j_jlock)) {3099			while (journal->j_trans_id == old_trans_id &&3100			       atomic_read(&journal->j_jlock)) {3101				queue_log_writer(sb);3102			}3103			goto relock;3104		}3105		retval = journal_join(&myth, sb);3106		if (retval)3107			goto out_fail;3108 3109		/* someone might have ended the transaction while we joined */3110		if (old_trans_id != journal->j_trans_id) {3111			retval = do_journal_end(&myth, 0);3112		} else {3113			retval = do_journal_end(&myth, COMMIT_NOW);3114		}3115 3116		if (retval)3117			goto out_fail;3118 3119		PROC_INFO_INC(sb, journal.journal_relock_wcount);3120		goto relock;3121	}3122	/* we are the first writer, set trans_id */3123	if (journal->j_trans_start_time == 0) {3124		journal->j_trans_start_time = ktime_get_seconds();3125	}3126	atomic_inc(&journal->j_wcount);3127	journal->j_len_alloc += nblocks;3128	th->t_blocks_logged = 0;3129	th->t_blocks_allocated = nblocks;3130	th->t_trans_id = journal->j_trans_id;3131	unlock_journal(sb);3132	INIT_LIST_HEAD(&th->t_list);3133	return 0;3134 3135out_fail:3136	memset(th, 0, sizeof(*th));3137	/*3138	 * Re-set th->t_super, so we can properly keep track of how many3139	 * persistent transactions there are. We need to do this so if this3140	 * call is part of a failed restart_transaction, we can free it later3141	 */3142	th->t_super = sb;3143	return retval;3144}3145 3146struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct3147								    super_block3148								    *s,3149								    int nblocks)3150{3151	int ret;3152	struct reiserfs_transaction_handle *th;3153 3154	/*3155	 * if we're nesting into an existing transaction.  It will be3156	 * persistent on its own3157	 */3158	if (reiserfs_transaction_running(s)) {3159		th = current->journal_info;3160		th->t_refcount++;3161		BUG_ON(th->t_refcount < 2);3162 3163		return th;3164	}3165	th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);3166	if (!th)3167		return NULL;3168	ret = journal_begin(th, s, nblocks);3169	if (ret) {3170		kfree(th);3171		return NULL;3172	}3173 3174	SB_JOURNAL(s)->j_persistent_trans++;3175	return th;3176}3177 3178int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)3179{3180	struct super_block *s = th->t_super;3181	int ret = 0;3182	if (th->t_trans_id)3183		ret = journal_end(th);3184	else3185		ret = -EIO;3186	if (th->t_refcount == 0) {3187		SB_JOURNAL(s)->j_persistent_trans--;3188		kfree(th);3189	}3190	return ret;3191}3192 3193static int journal_join(struct reiserfs_transaction_handle *th,3194			struct super_block *sb)3195{3196	struct reiserfs_transaction_handle *cur_th = current->journal_info;3197 3198	/*3199	 * this keeps do_journal_end from NULLing out the3200	 * current->journal_info pointer3201	 */3202	th->t_handle_save = cur_th;3203	BUG_ON(cur_th && cur_th->t_refcount > 1);3204	return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);3205}3206 3207int journal_join_abort(struct reiserfs_transaction_handle *th,3208		       struct super_block *sb)3209{3210	struct reiserfs_transaction_handle *cur_th = current->journal_info;3211 3212	/*3213	 * this keeps do_journal_end from NULLing out the3214	 * current->journal_info pointer3215	 */3216	th->t_handle_save = cur_th;3217	BUG_ON(cur_th && cur_th->t_refcount > 1);3218	return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);3219}3220 3221int journal_begin(struct reiserfs_transaction_handle *th,3222		  struct super_block *sb, unsigned long nblocks)3223{3224	struct reiserfs_transaction_handle *cur_th = current->journal_info;3225	int ret;3226 3227	th->t_handle_save = NULL;3228	if (cur_th) {3229		/* we are nesting into the current transaction */3230		if (cur_th->t_super == sb) {3231			BUG_ON(!cur_th->t_refcount);3232			cur_th->t_refcount++;3233			memcpy(th, cur_th, sizeof(*th));3234			if (th->t_refcount <= 1)3235				reiserfs_warning(sb, "reiserfs-2005",3236						 "BAD: refcount <= 1, but "3237						 "journal_info != 0");3238			return 0;3239		} else {3240			/*3241			 * we've ended up with a handle from a different3242			 * filesystem.  save it and restore on journal_end.3243			 * This should never really happen...3244			 */3245			reiserfs_warning(sb, "clm-2100",3246					 "nesting info a different FS");3247			th->t_handle_save = current->journal_info;3248			current->journal_info = th;3249		}3250	} else {3251		current->journal_info = th;3252	}3253	ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);3254	BUG_ON(current->journal_info != th);3255 3256	/*3257	 * I guess this boils down to being the reciprocal of clm-2100 above.3258	 * If do_journal_begin_r fails, we need to put it back, since3259	 * journal_end won't be called to do it. */3260	if (ret)3261		current->journal_info = th->t_handle_save;3262	else3263		BUG_ON(!th->t_refcount);3264 3265	return ret;3266}3267 3268/*3269 * puts bh into the current transaction.  If it was already there, reorders3270 * removes the old pointers from the hash, and puts new ones in (to make3271 * sure replay happen in the right order).3272 *3273 * if it was dirty, cleans and files onto the clean list.  I can't let it3274 * be dirty again until the transaction is committed.3275 *3276 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.3277 */3278int journal_mark_dirty(struct reiserfs_transaction_handle *th,3279		       struct buffer_head *bh)3280{3281	struct super_block *sb = th->t_super;3282	struct reiserfs_journal *journal = SB_JOURNAL(sb);3283	struct reiserfs_journal_cnode *cn = NULL;3284	int count_already_incd = 0;3285	int prepared = 0;3286	BUG_ON(!th->t_trans_id);3287 3288	PROC_INFO_INC(sb, journal.mark_dirty);3289	if (th->t_trans_id != journal->j_trans_id) {3290		reiserfs_panic(th->t_super, "journal-1577",3291			       "handle trans id %ld != current trans id %ld",3292			       th->t_trans_id, journal->j_trans_id);3293	}3294 3295	prepared = test_clear_buffer_journal_prepared(bh);3296	clear_buffer_journal_restore_dirty(bh);3297	/* already in this transaction, we are done */3298	if (buffer_journaled(bh)) {3299		PROC_INFO_INC(sb, journal.mark_dirty_already);3300		return 0;3301	}3302 3303	/*3304	 * this must be turned into a panic instead of a warning.  We can't3305	 * allow a dirty or journal_dirty or locked buffer to be logged, as3306	 * some changes could get to disk too early.  NOT GOOD.3307	 */3308	if (!prepared || buffer_dirty(bh)) {3309		reiserfs_warning(sb, "journal-1777",3310				 "buffer %llu bad state "3311				 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",3312				 (unsigned long long)bh->b_blocknr,3313				 prepared ? ' ' : '!',3314				 buffer_locked(bh) ? ' ' : '!',3315				 buffer_dirty(bh) ? ' ' : '!',3316				 buffer_journal_dirty(bh) ? ' ' : '!');3317	}3318 3319	if (atomic_read(&journal->j_wcount) <= 0) {3320		reiserfs_warning(sb, "journal-1409",3321				 "returning because j_wcount was %d",3322				 atomic_read(&journal->j_wcount));3323		return 1;3324	}3325	/*3326	 * this error means I've screwed up, and we've overflowed3327	 * the transaction.  Nothing can be done here, except make the3328	 * FS readonly or panic.3329	 */3330	if (journal->j_len >= journal->j_trans_max) {3331		reiserfs_panic(th->t_super, "journal-1413",3332			       "j_len (%lu) is too big",3333			       journal->j_len);3334	}3335 3336	if (buffer_journal_dirty(bh)) {3337		count_already_incd = 1;3338		PROC_INFO_INC(sb, journal.mark_dirty_notjournal);3339		clear_buffer_journal_dirty(bh);3340	}3341 3342	if (journal->j_len > journal->j_len_alloc) {3343		journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;3344	}3345 3346	set_buffer_journaled(bh);3347 3348	/* now put this guy on the end */3349	if (!cn) {3350		cn = get_cnode(sb);3351		if (!cn) {3352			reiserfs_panic(sb, "journal-4", "get_cnode failed!");3353		}3354 3355		if (th->t_blocks_logged == th->t_blocks_allocated) {3356			th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;3357			journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;3358		}3359		th->t_blocks_logged++;3360		journal->j_len++;3361 3362		cn->bh = bh;3363		cn->blocknr = bh->b_blocknr;3364		cn->sb = sb;3365		cn->jlist = NULL;3366		insert_journal_hash(journal->j_hash_table, cn);3367		if (!count_already_incd) {3368			get_bh(bh);3369		}3370	}3371	cn->next = NULL;3372	cn->prev = journal->j_last;3373	cn->bh = bh;3374	if (journal->j_last) {3375		journal->j_last->next = cn;3376		journal->j_last = cn;3377	} else {3378		journal->j_first = cn;3379		journal->j_last = cn;3380	}3381	reiserfs_schedule_old_flush(sb);3382	return 0;3383}3384 3385int journal_end(struct reiserfs_transaction_handle *th)3386{3387	struct super_block *sb = th->t_super;3388	if (!current->journal_info && th->t_refcount > 1)3389		reiserfs_warning(sb, "REISER-NESTING",3390				 "th NULL, refcount %d", th->t_refcount);3391 3392	if (!th->t_trans_id) {3393		WARN_ON(1);3394		return -EIO;3395	}3396 3397	th->t_refcount--;3398	if (th->t_refcount > 0) {3399		struct reiserfs_transaction_handle *cur_th =3400		    current->journal_info;3401 3402		/*3403		 * we aren't allowed to close a nested transaction on a3404		 * different filesystem from the one in the task struct3405		 */3406		BUG_ON(cur_th->t_super != th->t_super);3407 3408		if (th != cur_th) {3409			memcpy(current->journal_info, th, sizeof(*th));3410			th->t_trans_id = 0;3411		}3412		return 0;3413	} else {3414		return do_journal_end(th, 0);3415	}3416}3417 3418/*3419 * removes from the current transaction, relsing and descrementing any counters.3420 * also files the removed buffer directly onto the clean list3421 *3422 * called by journal_mark_freed when a block has been deleted3423 *3424 * returns 1 if it cleaned and relsed the buffer. 0 otherwise3425 */3426static int remove_from_transaction(struct super_block *sb,3427				   b_blocknr_t blocknr, int already_cleaned)3428{3429	struct buffer_head *bh;3430	struct reiserfs_journal_cnode *cn;3431	struct reiserfs_journal *journal = SB_JOURNAL(sb);3432	int ret = 0;3433 3434	cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);3435	if (!cn || !cn->bh) {3436		return ret;3437	}3438	bh = cn->bh;3439	if (cn->prev) {3440		cn->prev->next = cn->next;3441	}3442	if (cn->next) {3443		cn->next->prev = cn->prev;3444	}3445	if (cn == journal->j_first) {3446		journal->j_first = cn->next;3447	}3448	if (cn == journal->j_last) {3449		journal->j_last = cn->prev;3450	}3451	remove_journal_hash(sb, journal->j_hash_table, NULL,3452			    bh->b_blocknr, 0);3453	clear_buffer_journaled(bh);	/* don't log this one */3454 3455	if (!already_cleaned) {3456		clear_buffer_journal_dirty(bh);3457		clear_buffer_dirty(bh);3458		clear_buffer_journal_test(bh);3459		put_bh(bh);3460		if (atomic_read(&bh->b_count) < 0) {3461			reiserfs_warning(sb, "journal-1752",3462					 "b_count < 0");3463		}3464		ret = 1;3465	}3466	journal->j_len--;3467	journal->j_len_alloc--;3468	free_cnode(sb, cn);3469	return ret;3470}3471 3472/*3473 * for any cnode in a journal list, it can only be dirtied of all the3474 * transactions that include it are committed to disk.3475 * this checks through each transaction, and returns 1 if you are allowed3476 * to dirty, and 0 if you aren't3477 *3478 * it is called by dirty_journal_list, which is called after3479 * flush_commit_list has gotten all the log blocks for a given3480 * transaction on disk3481 *3482 */3483static int can_dirty(struct reiserfs_journal_cnode *cn)3484{3485	struct super_block *sb = cn->sb;3486	b_blocknr_t blocknr = cn->blocknr;3487	struct reiserfs_journal_cnode *cur = cn->hprev;3488	int can_dirty = 1;3489 3490	/*3491	 * first test hprev.  These are all newer than cn, so any node here3492	 * with the same block number and dev means this node can't be sent3493	 * to disk right now.3494	 */3495	while (cur && can_dirty) {3496		if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&3497		    cur->blocknr == blocknr) {3498			can_dirty = 0;3499		}3500		cur = cur->hprev;3501	}3502	/*3503	 * then test hnext.  These are all older than cn.  As long as they3504	 * are committed to the log, it is safe to write cn to disk3505	 */3506	cur = cn->hnext;3507	while (cur && can_dirty) {3508		if (cur->jlist && cur->jlist->j_len > 0 &&3509		    atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&3510		    cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {3511			can_dirty = 0;3512		}3513		cur = cur->hnext;3514	}3515	return can_dirty;3516}3517 3518/*3519 * syncs the commit blocks, but does not force the real buffers to disk3520 * will wait until the current transaction is done/committed before returning3521 */3522int journal_end_sync(struct reiserfs_transaction_handle *th)3523{3524	struct super_block *sb = th->t_super;3525	struct reiserfs_journal *journal = SB_JOURNAL(sb);3526 3527	BUG_ON(!th->t_trans_id);3528	/* you can sync while nested, very, very bad */3529	BUG_ON(th->t_refcount > 1);3530	if (journal->j_len == 0) {3531		reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),3532					     1);3533		journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));3534	}3535	return do_journal_end(th, COMMIT_NOW | WAIT);3536}3537 3538/* writeback the pending async commits to disk */3539static void flush_async_commits(struct work_struct *work)3540{3541	struct reiserfs_journal *journal =3542		container_of(work, struct reiserfs_journal, j_work.work);3543	struct super_block *sb = journal->j_work_sb;3544	struct reiserfs_journal_list *jl;3545	struct list_head *entry;3546 3547	reiserfs_write_lock(sb);3548	if (!list_empty(&journal->j_journal_list)) {3549		/* last entry is the youngest, commit it and you get everything */3550		entry = journal->j_journal_list.prev;3551		jl = JOURNAL_LIST_ENTRY(entry);3552		flush_commit_list(sb, jl, 1);3553	}3554	reiserfs_write_unlock(sb);3555}3556 3557/*3558 * flushes any old transactions to disk3559 * ends the current transaction if it is too old3560 */3561void reiserfs_flush_old_commits(struct super_block *sb)3562{3563	time64_t now;3564	struct reiserfs_transaction_handle th;3565	struct reiserfs_journal *journal = SB_JOURNAL(sb);3566 3567	now = ktime_get_seconds();3568	/*3569	 * safety check so we don't flush while we are replaying the log during3570	 * mount3571	 */3572	if (list_empty(&journal->j_journal_list))3573		return;3574 3575	/*3576	 * check the current transaction.  If there are no writers, and it is3577	 * too old, finish it, and force the commit blocks to disk3578	 */3579	if (atomic_read(&journal->j_wcount) <= 0 &&3580	    journal->j_trans_start_time > 0 &&3581	    journal->j_len > 0 &&3582	    (now - journal->j_trans_start_time) > journal->j_max_trans_age) {3583		if (!journal_join(&th, sb)) {3584			reiserfs_prepare_for_journal(sb,3585						     SB_BUFFER_WITH_SB(sb),3586						     1);3587			journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));3588 3589			/*3590			 * we're only being called from kreiserfsd, it makes3591			 * no sense to do an async commit so that kreiserfsd3592			 * can do it later3593			 */3594			do_journal_end(&th, COMMIT_NOW | WAIT);3595		}3596	}3597}3598 3599/*3600 * returns 0 if do_journal_end should return right away, returns 1 if3601 * do_journal_end should finish the commit3602 *3603 * if the current transaction is too old, but still has writers, this will3604 * wait on j_join_wait until all the writers are done.  By the time it3605 * wakes up, the transaction it was called has already ended, so it just3606 * flushes the commit list and returns 0.3607 *3608 * Won't batch when flush or commit_now is set.  Also won't batch when3609 * others are waiting on j_join_wait.3610 *3611 * Note, we can't allow the journal_end to proceed while there are still3612 * writers in the log.3613 */3614static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)3615{3616 3617	time64_t now;3618	int flush = flags & FLUSH_ALL;3619	int commit_now = flags & COMMIT_NOW;3620	int wait_on_commit = flags & WAIT;3621	struct reiserfs_journal_list *jl;3622	struct super_block *sb = th->t_super;3623	struct reiserfs_journal *journal = SB_JOURNAL(sb);3624 3625	BUG_ON(!th->t_trans_id);3626 3627	if (th->t_trans_id != journal->j_trans_id) {3628		reiserfs_panic(th->t_super, "journal-1577",3629			       "handle trans id %ld != current trans id %ld",3630			       th->t_trans_id, journal->j_trans_id);3631	}3632 3633	journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);3634	/* <= 0 is allowed.  unmounting might not call begin */3635	if (atomic_read(&journal->j_wcount) > 0)3636		atomic_dec(&journal->j_wcount);3637 3638	/*3639	 * BUG, deal with case where j_len is 0, but people previously3640	 * freed blocks need to be released will be dealt with by next3641	 * transaction that actually writes something, but should be taken3642	 * care of in this trans3643	 */3644	BUG_ON(journal->j_len == 0);3645 3646	/*3647	 * if wcount > 0, and we are called to with flush or commit_now,3648	 * we wait on j_join_wait.  We will wake up when the last writer has3649	 * finished the transaction, and started it on its way to the disk.3650	 * Then, we flush the commit or journal list, and just return 03651	 * because the rest of journal end was already done for this3652	 * transaction.3653	 */3654	if (atomic_read(&journal->j_wcount) > 0) {3655		if (flush || commit_now) {3656			unsigned trans_id;3657 3658			jl = journal->j_current_jl;3659			trans_id = jl->j_trans_id;3660			if (wait_on_commit)3661				jl->j_state |= LIST_COMMIT_PENDING;3662			atomic_set(&journal->j_jlock, 1);3663			if (flush) {3664				journal->j_next_full_flush = 1;3665			}3666			unlock_journal(sb);3667 3668			/*3669			 * sleep while the current transaction is3670			 * still j_jlocked3671			 */3672			while (journal->j_trans_id == trans_id) {3673				if (atomic_read(&journal->j_jlock)) {3674					queue_log_writer(sb);3675				} else {3676					lock_journal(sb);3677					if (journal->j_trans_id == trans_id) {3678						atomic_set(&journal->j_jlock,3679							   1);3680					}3681					unlock_journal(sb);3682				}3683			}3684			BUG_ON(journal->j_trans_id == trans_id);3685 3686			if (commit_now3687			    && journal_list_still_alive(sb, trans_id)3688			    && wait_on_commit) {3689				flush_commit_list(sb, jl, 1);3690			}3691			return 0;3692		}3693		unlock_journal(sb);3694		return 0;3695	}3696 3697	/* deal with old transactions where we are the last writers */3698	now = ktime_get_seconds();3699	if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {3700		commit_now = 1;3701		journal->j_next_async_flush = 1;3702	}3703	/* don't batch when someone is waiting on j_join_wait */3704	/* don't batch when syncing the commit or flushing the whole trans */3705	if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))3706	    && !flush && !commit_now && (journal->j_len < journal->j_max_batch)3707	    && journal->j_len_alloc < journal->j_max_batch3708	    && journal->j_cnode_free > (journal->j_trans_max * 3)) {3709		journal->j_bcount++;3710		unlock_journal(sb);3711		return 0;3712	}3713 3714	if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {3715		reiserfs_panic(sb, "journal-003",3716			       "j_start (%ld) is too high",3717			       journal->j_start);3718	}3719	return 1;3720}3721 3722/*3723 * Does all the work that makes deleting blocks safe.3724 * when deleting a block mark BH_JNew, just remove it from the current3725 * transaction, clean it's buffer_head and move on.3726 *3727 * otherwise:3728 * set a bit for the block in the journal bitmap.  That will prevent it from3729 * being allocated for unformatted nodes before this transaction has finished.3730 *3731 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.3732 * That will prevent any old transactions with this block from trying to flush3733 * to the real location.  Since we aren't removing the cnode from the3734 * journal_list_hash, *the block can't be reallocated yet.3735 *3736 * Then remove it from the current transaction, decrementing any counters and3737 * filing it on the clean list.3738 */3739int journal_mark_freed(struct reiserfs_transaction_handle *th,3740		       struct super_block *sb, b_blocknr_t blocknr)3741{3742	struct reiserfs_journal *journal = SB_JOURNAL(sb);3743	struct reiserfs_journal_cnode *cn = NULL;3744	struct buffer_head *bh = NULL;3745	struct reiserfs_list_bitmap *jb = NULL;3746	int cleaned = 0;3747	BUG_ON(!th->t_trans_id);3748 3749	cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);3750	if (cn && cn->bh) {3751		bh = cn->bh;3752		get_bh(bh);3753	}3754	/* if it is journal new, we just remove it from this transaction */3755	if (bh && buffer_journal_new(bh)) {3756		clear_buffer_journal_new(bh);3757		clear_prepared_bits(bh);3758		reiserfs_clean_and_file_buffer(bh);3759		cleaned = remove_from_transaction(sb, blocknr, cleaned);3760	} else {3761		/*3762		 * set the bit for this block in the journal bitmap3763		 * for this transaction3764		 */3765		jb = journal->j_current_jl->j_list_bitmap;3766		if (!jb) {3767			reiserfs_panic(sb, "journal-1702",3768				       "journal_list_bitmap is NULL");3769		}3770		set_bit_in_list_bitmap(sb, blocknr, jb);3771 3772		/* Note, the entire while loop is not allowed to schedule.  */3773 3774		if (bh) {3775			clear_prepared_bits(bh);3776			reiserfs_clean_and_file_buffer(bh);3777		}3778		cleaned = remove_from_transaction(sb, blocknr, cleaned);3779 3780		/*3781		 * find all older transactions with this block,3782		 * make sure they don't try to write it out3783		 */3784		cn = get_journal_hash_dev(sb, journal->j_list_hash_table,3785					  blocknr);3786		while (cn) {3787			if (sb == cn->sb && blocknr == cn->blocknr) {3788				set_bit(BLOCK_FREED, &cn->state);3789				if (cn->bh) {3790					/*3791					 * remove_from_transaction will brelse3792					 * the buffer if it was in the current3793					 * trans3794					 */3795					if (!cleaned) {3796						clear_buffer_journal_dirty(cn->3797									   bh);3798						clear_buffer_dirty(cn->bh);3799						clear_buffer_journal_test(cn->3800									  bh);3801						cleaned = 1;3802						put_bh(cn->bh);3803						if (atomic_read3804						    (&cn->bh->b_count) < 0) {3805							reiserfs_warning(sb,3806								 "journal-2138",3807								 "cn->bh->b_count < 0");3808						}3809					}3810					/*3811					 * since we are clearing the bh,3812					 * we MUST dec nonzerolen3813					 */3814					if (cn->jlist) {3815						atomic_dec(&cn->jlist->3816							   j_nonzerolen);3817					}3818					cn->bh = NULL;3819				}3820			}3821			cn = cn->hnext;3822		}3823	}3824 3825	if (bh)3826		release_buffer_page(bh); /* get_hash grabs the buffer */3827	return 0;3828}3829 3830void reiserfs_update_inode_transaction(struct inode *inode)3831{3832	struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);3833	REISERFS_I(inode)->i_jl = journal->j_current_jl;3834	REISERFS_I(inode)->i_trans_id = journal->j_trans_id;3835}3836 3837/*3838 * returns -1 on error, 0 if no commits/barriers were done and 13839 * if a transaction was actually committed and the barrier was done3840 */3841static int __commit_trans_jl(struct inode *inode, unsigned long id,3842			     struct reiserfs_journal_list *jl)3843{3844	struct reiserfs_transaction_handle th;3845	struct super_block *sb = inode->i_sb;3846	struct reiserfs_journal *journal = SB_JOURNAL(sb);3847	int ret = 0;3848 3849	/*3850	 * is it from the current transaction,3851	 * or from an unknown transaction?3852	 */3853	if (id == journal->j_trans_id) {3854		jl = journal->j_current_jl;3855		/*3856		 * try to let other writers come in and3857		 * grow this transaction3858		 */3859		let_transaction_grow(sb, id);3860		if (journal->j_trans_id != id) {3861			goto flush_commit_only;3862		}3863 3864		ret = journal_begin(&th, sb, 1);3865		if (ret)3866			return ret;3867 3868		/* someone might have ended this transaction while we joined */3869		if (journal->j_trans_id != id) {3870			reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),3871						     1);3872			journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));3873			ret = journal_end(&th);3874			goto flush_commit_only;3875		}3876 3877		ret = journal_end_sync(&th);3878		if (!ret)3879			ret = 1;3880 3881	} else {3882		/*3883		 * this gets tricky, we have to make sure the journal list in3884		 * the inode still exists.  We know the list is still around3885		 * if we've got a larger transaction id than the oldest list3886		 */3887flush_commit_only:3888		if (journal_list_still_alive(inode->i_sb, id)) {3889			/*3890			 * we only set ret to 1 when we know for sure3891			 * the barrier hasn't been started yet on the commit3892			 * block.3893			 */3894			if (atomic_read(&jl->j_commit_left) > 1)3895				ret = 1;3896			flush_commit_list(sb, jl, 1);3897			if (journal->j_errno)3898				ret = journal->j_errno;3899		}3900	}3901	/* otherwise the list is gone, and long since committed */3902	return ret;3903}3904 3905int reiserfs_commit_for_inode(struct inode *inode)3906{3907	unsigned int id = REISERFS_I(inode)->i_trans_id;3908	struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;3909 3910	/*3911	 * for the whole inode, assume unset id means it was3912	 * changed in the current transaction.  More conservative3913	 */3914	if (!id || !jl) {3915		reiserfs_update_inode_transaction(inode);3916		id = REISERFS_I(inode)->i_trans_id;3917		/* jl will be updated in __commit_trans_jl */3918	}3919 3920	return __commit_trans_jl(inode, id, jl);3921}3922 3923void reiserfs_restore_prepared_buffer(struct super_block *sb,3924				      struct buffer_head *bh)3925{3926	struct reiserfs_journal *journal = SB_JOURNAL(sb);3927	PROC_INFO_INC(sb, journal.restore_prepared);3928	if (!bh) {3929		return;3930	}3931	if (test_clear_buffer_journal_restore_dirty(bh) &&3932	    buffer_journal_dirty(bh)) {3933		struct reiserfs_journal_cnode *cn;3934		reiserfs_write_lock(sb);3935		cn = get_journal_hash_dev(sb,3936					  journal->j_list_hash_table,3937					  bh->b_blocknr);3938		if (cn && can_dirty(cn)) {3939			set_buffer_journal_test(bh);3940			mark_buffer_dirty(bh);3941		}3942		reiserfs_write_unlock(sb);3943	}3944	clear_buffer_journal_prepared(bh);3945}3946 3947extern struct tree_balance *cur_tb;3948/*3949 * before we can change a metadata block, we have to make sure it won't3950 * be written to disk while we are altering it.  So, we must:3951 * clean it3952 * wait on it.3953 */3954int reiserfs_prepare_for_journal(struct super_block *sb,3955				 struct buffer_head *bh, int wait)3956{3957	PROC_INFO_INC(sb, journal.prepare);3958 3959	if (!trylock_buffer(bh)) {3960		if (!wait)3961			return 0;3962		lock_buffer(bh);3963	}3964	set_buffer_journal_prepared(bh);3965	if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {3966		clear_buffer_journal_test(bh);3967		set_buffer_journal_restore_dirty(bh);3968	}3969	unlock_buffer(bh);3970	return 1;3971}3972 3973/*3974 * long and ugly.  If flush, will not return until all commit3975 * blocks and all real buffers in the trans are on disk.3976 * If no_async, won't return until all commit blocks are on disk.3977 *3978 * keep reading, there are comments as you go along3979 *3980 * If the journal is aborted, we just clean up. Things like flushing3981 * journal lists, etc just won't happen.3982 */3983static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)3984{3985	struct super_block *sb = th->t_super;3986	struct reiserfs_journal *journal = SB_JOURNAL(sb);3987	struct reiserfs_journal_cnode *cn, *next, *jl_cn;3988	struct reiserfs_journal_cnode *last_cn = NULL;3989	struct reiserfs_journal_desc *desc;3990	struct reiserfs_journal_commit *commit;3991	struct buffer_head *c_bh;	/* commit bh */3992	struct buffer_head *d_bh;	/* desc bh */3993	int cur_write_start = 0;	/* start index of current log write */3994	int i;3995	int flush;3996	int wait_on_commit;3997	struct reiserfs_journal_list *jl, *temp_jl;3998	struct list_head *entry, *safe;3999	unsigned long jindex;4000	unsigned int commit_trans_id;4001	int trans_half;4002	int depth;4003 4004	BUG_ON(th->t_refcount > 1);4005	BUG_ON(!th->t_trans_id);4006	BUG_ON(!th->t_super);4007 4008	/*4009	 * protect flush_older_commits from doing mistakes if the4010	 * transaction ID counter gets overflowed.4011	 */4012	if (th->t_trans_id == ~0U)4013		flags |= FLUSH_ALL | COMMIT_NOW | WAIT;4014	flush = flags & FLUSH_ALL;4015	wait_on_commit = flags & WAIT;4016 4017	current->journal_info = th->t_handle_save;4018	reiserfs_check_lock_depth(sb, "journal end");4019	if (journal->j_len == 0) {4020		reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),4021					     1);4022		journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));4023	}4024 4025	lock_journal(sb);4026	if (journal->j_next_full_flush) {4027		flags |= FLUSH_ALL;4028		flush = 1;4029	}4030	if (journal->j_next_async_flush) {4031		flags |= COMMIT_NOW | WAIT;4032		wait_on_commit = 1;4033	}4034 4035	/*4036	 * check_journal_end locks the journal, and unlocks if it does4037	 * not return 1 it tells us if we should continue with the4038	 * journal_end, or just return4039	 */4040	if (!check_journal_end(th, flags)) {4041		reiserfs_schedule_old_flush(sb);4042		wake_queued_writers(sb);4043		reiserfs_async_progress_wait(sb);4044		goto out;4045	}4046 4047	/* check_journal_end might set these, check again */4048	if (journal->j_next_full_flush) {4049		flush = 1;4050	}4051 4052	/*4053	 * j must wait means we have to flush the log blocks, and the4054	 * real blocks for this transaction4055	 */4056	if (journal->j_must_wait > 0) {4057		flush = 1;4058	}4059#ifdef REISERFS_PREALLOCATE4060	/*4061	 * quota ops might need to nest, setup the journal_info pointer4062	 * for them and raise the refcount so that it is > 0.4063	 */4064	current->journal_info = th;4065	th->t_refcount++;4066 4067	/* it should not involve new blocks into the transaction */4068	reiserfs_discard_all_prealloc(th);4069 4070	th->t_refcount--;4071	current->journal_info = th->t_handle_save;4072#endif4073 4074	/* setup description block */4075	d_bh =4076	    journal_getblk(sb,4077			   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +4078			   journal->j_start);4079	set_buffer_uptodate(d_bh);4080	desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;4081	memset(d_bh->b_data, 0, d_bh->b_size);4082	memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);4083	set_desc_trans_id(desc, journal->j_trans_id);4084 4085	/*4086	 * setup commit block.  Don't write (keep it clean too) this one4087	 * until after everyone else is written4088	 */4089	c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +4090			      ((journal->j_start + journal->j_len +4091				1) % SB_ONDISK_JOURNAL_SIZE(sb)));4092	commit = (struct reiserfs_journal_commit *)c_bh->b_data;4093	memset(c_bh->b_data, 0, c_bh->b_size);4094	set_commit_trans_id(commit, journal->j_trans_id);4095	set_buffer_uptodate(c_bh);4096 4097	/* init this journal list */4098	jl = journal->j_current_jl;4099 4100	/*4101	 * we lock the commit before doing anything because4102	 * we want to make sure nobody tries to run flush_commit_list until4103	 * the new transaction is fully setup, and we've already flushed the4104	 * ordered bh list4105	 */4106	reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);4107 4108	/* save the transaction id in case we need to commit it later */4109	commit_trans_id = jl->j_trans_id;4110 4111	atomic_set(&jl->j_older_commits_done, 0);4112	jl->j_trans_id = journal->j_trans_id;4113	jl->j_timestamp = journal->j_trans_start_time;4114	jl->j_commit_bh = c_bh;4115	jl->j_start = journal->j_start;4116	jl->j_len = journal->j_len;4117	atomic_set(&jl->j_nonzerolen, journal->j_len);4118	atomic_set(&jl->j_commit_left, journal->j_len + 2);4119	jl->j_realblock = NULL;4120 4121	/*4122	 * The ENTIRE FOR LOOP MUST not cause schedule to occur.4123	 * for each real block, add it to the journal list hash,4124	 * copy into real block index array in the commit or desc block4125	 */4126	trans_half = journal_trans_half(sb->s_blocksize);4127	for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {4128		if (buffer_journaled(cn->bh)) {4129			jl_cn = get_cnode(sb);4130			if (!jl_cn) {4131				reiserfs_panic(sb, "journal-1676",4132					       "get_cnode returned NULL");4133			}4134			if (i == 0) {4135				jl->j_realblock = jl_cn;4136			}4137			jl_cn->prev = last_cn;4138			jl_cn->next = NULL;4139			if (last_cn) {4140				last_cn->next = jl_cn;4141			}4142			last_cn = jl_cn;4143			/*4144			 * make sure the block we are trying to log4145			 * is not a block of journal or reserved area4146			 */4147			if (is_block_in_log_or_reserved_area4148			    (sb, cn->bh->b_blocknr)) {4149				reiserfs_panic(sb, "journal-2332",4150					       "Trying to log block %lu, "4151					       "which is a log block",4152					       cn->bh->b_blocknr);4153			}4154			jl_cn->blocknr = cn->bh->b_blocknr;4155			jl_cn->state = 0;4156			jl_cn->sb = sb;4157			jl_cn->bh = cn->bh;4158			jl_cn->jlist = jl;4159			insert_journal_hash(journal->j_list_hash_table, jl_cn);4160			if (i < trans_half) {4161				desc->j_realblock[i] =4162				    cpu_to_le32(cn->bh->b_blocknr);4163			} else {4164				commit->j_realblock[i - trans_half] =4165				    cpu_to_le32(cn->bh->b_blocknr);4166			}4167		} else {4168			i--;4169		}4170	}4171	set_desc_trans_len(desc, journal->j_len);4172	set_desc_mount_id(desc, journal->j_mount_id);4173	set_desc_trans_id(desc, journal->j_trans_id);4174	set_commit_trans_len(commit, journal->j_len);4175 4176	/*4177	 * special check in case all buffers in the journal4178	 * were marked for not logging4179	 */4180	BUG_ON(journal->j_len == 0);4181 4182	/*4183	 * we're about to dirty all the log blocks, mark the description block4184	 * dirty now too.  Don't mark the commit block dirty until all the4185	 * others are on disk4186	 */4187	mark_buffer_dirty(d_bh);4188 4189	/*4190	 * first data block is j_start + 1, so add one to4191	 * cur_write_start wherever you use it4192	 */4193	cur_write_start = journal->j_start;4194	cn = journal->j_first;4195	jindex = 1;	/* start at one so we don't get the desc again */4196	while (cn) {4197		clear_buffer_journal_new(cn->bh);4198		/* copy all the real blocks into log area.  dirty log blocks */4199		if (buffer_journaled(cn->bh)) {4200			struct buffer_head *tmp_bh;4201			char *addr;4202			struct page *page;4203			tmp_bh =4204			    journal_getblk(sb,4205					   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +4206					   ((cur_write_start +4207					     jindex) %4208					    SB_ONDISK_JOURNAL_SIZE(sb)));4209			set_buffer_uptodate(tmp_bh);4210			page = cn->bh->b_page;4211			addr = kmap(page);4212			memcpy(tmp_bh->b_data,4213			       addr + offset_in_page(cn->bh->b_data),4214			       cn->bh->b_size);4215			kunmap(page);4216			mark_buffer_dirty(tmp_bh);4217			jindex++;4218			set_buffer_journal_dirty(cn->bh);4219			clear_buffer_journaled(cn->bh);4220		} else {4221			/*4222			 * JDirty cleared sometime during transaction.4223			 * don't log this one4224			 */4225			reiserfs_warning(sb, "journal-2048",4226					 "BAD, buffer in journal hash, "4227					 "but not JDirty!");4228			brelse(cn->bh);4229		}4230		next = cn->next;4231		free_cnode(sb, cn);4232		cn = next;4233		reiserfs_cond_resched(sb);4234	}4235 4236	/*4237	 * we are done with both the c_bh and d_bh, but4238	 * c_bh must be written after all other commit blocks,4239	 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.4240	 */4241 4242	journal->j_current_jl = alloc_journal_list(sb);4243 4244	/* now it is safe to insert this transaction on the main list */4245	list_add_tail(&jl->j_list, &journal->j_journal_list);4246	list_add_tail(&jl->j_working_list, &journal->j_working_list);4247	journal->j_num_work_lists++;4248 4249	/* reset journal values for the next transaction */4250	journal->j_start =4251	    (journal->j_start + journal->j_len +4252	     2) % SB_ONDISK_JOURNAL_SIZE(sb);4253	atomic_set(&journal->j_wcount, 0);4254	journal->j_bcount = 0;4255	journal->j_last = NULL;4256	journal->j_first = NULL;4257	journal->j_len = 0;4258	journal->j_trans_start_time = 0;4259	/* check for trans_id overflow */4260	if (++journal->j_trans_id == 0)4261		journal->j_trans_id = 10;4262	journal->j_current_jl->j_trans_id = journal->j_trans_id;4263	journal->j_must_wait = 0;4264	journal->j_len_alloc = 0;4265	journal->j_next_full_flush = 0;4266	journal->j_next_async_flush = 0;4267	init_journal_hash(sb);4268 4269	/*4270	 * make sure reiserfs_add_jh sees the new current_jl before we4271	 * write out the tails4272	 */4273	smp_mb();4274 4275	/*4276	 * tail conversion targets have to hit the disk before we end the4277	 * transaction.  Otherwise a later transaction might repack the tail4278	 * before this transaction commits, leaving the data block unflushed4279	 * and clean, if we crash before the later transaction commits, the4280	 * data block is lost.4281	 */4282	if (!list_empty(&jl->j_tail_bh_list)) {4283		depth = reiserfs_write_unlock_nested(sb);4284		write_ordered_buffers(&journal->j_dirty_buffers_lock,4285				      journal, jl, &jl->j_tail_bh_list);4286		reiserfs_write_lock_nested(sb, depth);4287	}4288	BUG_ON(!list_empty(&jl->j_tail_bh_list));4289	mutex_unlock(&jl->j_commit_mutex);4290 4291	/*4292	 * honor the flush wishes from the caller, simple commits can4293	 * be done outside the journal lock, they are done below4294	 *4295	 * if we don't flush the commit list right now, we put it into4296	 * the work queue so the people waiting on the async progress work4297	 * queue don't wait for this proc to flush journal lists and such.4298	 */4299	if (flush) {4300		flush_commit_list(sb, jl, 1);4301		flush_journal_list(sb, jl, 1);4302	} else if (!(jl->j_state & LIST_COMMIT_PENDING)) {4303		/*4304		 * Avoid queueing work when sb is being shut down. Transaction4305		 * will be flushed on journal shutdown.4306		 */4307		if (sb->s_flags & SB_ACTIVE)4308			queue_delayed_work(REISERFS_SB(sb)->commit_wq,4309					   &journal->j_work, HZ / 10);4310	}4311 4312	/*4313	 * if the next transaction has any chance of wrapping, flush4314	 * transactions that might get overwritten.  If any journal lists4315	 * are very old flush them as well.4316	 */4317first_jl:4318	list_for_each_safe(entry, safe, &journal->j_journal_list) {4319		temp_jl = JOURNAL_LIST_ENTRY(entry);4320		if (journal->j_start <= temp_jl->j_start) {4321			if ((journal->j_start + journal->j_trans_max + 1) >=4322			    temp_jl->j_start) {4323				flush_used_journal_lists(sb, temp_jl);4324				goto first_jl;4325			} else if ((journal->j_start +4326				    journal->j_trans_max + 1) <4327				   SB_ONDISK_JOURNAL_SIZE(sb)) {4328				/*4329				 * if we don't cross into the next4330				 * transaction and we don't wrap, there is4331				 * no way we can overlap any later transactions4332				 * break now4333				 */4334				break;4335			}4336		} else if ((journal->j_start +4337			    journal->j_trans_max + 1) >4338			   SB_ONDISK_JOURNAL_SIZE(sb)) {4339			if (((journal->j_start + journal->j_trans_max + 1) %4340			     SB_ONDISK_JOURNAL_SIZE(sb)) >=4341			    temp_jl->j_start) {4342				flush_used_journal_lists(sb, temp_jl);4343				goto first_jl;4344			} else {4345				/*4346				* we don't overlap anything from out start4347				* to the end of the log, and our wrapped4348				* portion doesn't overlap anything at4349				* the start of the log.  We can break4350				*/4351				break;4352			}4353		}4354	}4355 4356	journal->j_current_jl->j_list_bitmap =4357	    get_list_bitmap(sb, journal->j_current_jl);4358 4359	if (!(journal->j_current_jl->j_list_bitmap)) {4360		reiserfs_panic(sb, "journal-1996",4361			       "could not get a list bitmap");4362	}4363 4364	atomic_set(&journal->j_jlock, 0);4365	unlock_journal(sb);4366	/* wake up any body waiting to join. */4367	clear_bit(J_WRITERS_QUEUED, &journal->j_state);4368	wake_up(&journal->j_join_wait);4369 4370	if (!flush && wait_on_commit &&4371	    journal_list_still_alive(sb, commit_trans_id)) {4372		flush_commit_list(sb, jl, 1);4373	}4374out:4375	reiserfs_check_lock_depth(sb, "journal end2");4376 4377	memset(th, 0, sizeof(*th));4378	/*4379	 * Re-set th->t_super, so we can properly keep track of how many4380	 * persistent transactions there are. We need to do this so if this4381	 * call is part of a failed restart_transaction, we can free it later4382	 */4383	th->t_super = sb;4384 4385	return journal->j_errno;4386}4387 4388/* Send the file system read only and refuse new transactions */4389void reiserfs_abort_journal(struct super_block *sb, int errno)4390{4391	struct reiserfs_journal *journal = SB_JOURNAL(sb);4392	if (test_bit(J_ABORTED, &journal->j_state))4393		return;4394 4395	if (!journal->j_errno)4396		journal->j_errno = errno;4397 4398	sb->s_flags |= SB_RDONLY;4399	set_bit(J_ABORTED, &journal->j_state);4400 4401#ifdef CONFIG_REISERFS_CHECK4402	dump_stack();4403#endif4404}4405