journal.c 121.4 KB
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/*
** Write ahead logging implementation copyright Chris Mason 2000
**
** The background commits make this code very interelated, and 
** overly complex.  I need to rethink things a bit....The major players:
**
** journal_begin -- call with the number of blocks you expect to log.  
**                  If the current transaction is too
** 		    old, it will block until the current transaction is 
** 		    finished, and then start a new one.
**		    Usually, your transaction will get joined in with 
**                  previous ones for speed.
**
** journal_join  -- same as journal_begin, but won't block on the current 
**                  transaction regardless of age.  Don't ever call
**                  this.  Ever.  There are only two places it should be 
**                  called from, and they are both inside this file.
**
** journal_mark_dirty -- adds blocks into this transaction.  clears any flags 
**                       that might make them get sent to disk
**                       and then marks them BH_JDirty.  Puts the buffer head 
**                       into the current transaction hash.  
**
** journal_end -- if the current transaction is batchable, it does nothing
**                   otherwise, it could do an async/synchronous commit, or
**                   a full flush of all log and real blocks in the 
**                   transaction.
**
** flush_old_commits -- if the current transaction is too old, it is ended and 
**                      commit blocks are sent to disk.  Forces commit blocks 
**                      to disk for all backgrounded commits that have been 
**                      around too long.
**		     -- Note, if you call this as an immediate flush from 
**		        from within kupdate, it will ignore the immediate flag
*/

#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/time.h>
#include <asm/semaphore.h>

#include <linux/vmalloc.h>
#include <linux/reiserfs_fs.h>

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/workqueue.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>

/* gets a struct reiserfs_journal_list * from a list head */
#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
                               j_list))
#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
                               j_working_list))

/* the number of mounted filesystems.  This is used to decide when to
** start and kill the commit workqueue
*/
static int reiserfs_mounted_fs_count;

static struct workqueue_struct *commit_wq;

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#define JOURNAL_TRANS_HALF 1018	/* must be correct to keep the desc and commit
				   structs at 4k */
#define BUFNR 64		/*read ahead */
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/* cnode stat bits.  Move these into reiserfs_fs.h */

#define BLOCK_FREED 2		/* this block was freed, and can't be written.  */
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#define BLOCK_FREED_HOLDER 3	/* this block was freed during this transaction, and can't be written */
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#define BLOCK_NEEDS_FLUSH 4	/* used in flush_journal_list */
#define BLOCK_DIRTIED 5

/* journal list state bits */
#define LIST_TOUCHED 1
#define LIST_DIRTY   2
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#define LIST_COMMIT_PENDING  4	/* someone will commit this list */
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/* flags for do_journal_end */
#define FLUSH_ALL   1		/* flush commit and real blocks */
#define COMMIT_NOW  2		/* end and commit this transaction */
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#define WAIT        4		/* wait for the log blocks to hit the disk */

static int do_journal_end(struct reiserfs_transaction_handle *,
			  struct super_block *, unsigned long nblocks,
			  int flags);
static int flush_journal_list(struct super_block *s,
			      struct reiserfs_journal_list *jl, int flushall);
static int flush_commit_list(struct super_block *s,
			     struct reiserfs_journal_list *jl, int flushall);
static int can_dirty(struct reiserfs_journal_cnode *cn);
static int journal_join(struct reiserfs_transaction_handle *th,
			struct super_block *p_s_sb, unsigned long nblocks);
static int release_journal_dev(struct super_block *super,
			       struct reiserfs_journal *journal);
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static int dirty_one_transaction(struct super_block *s,
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				 struct reiserfs_journal_list *jl);
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static void flush_async_commits(void *p);
static void queue_log_writer(struct super_block *s);

/* values for join in do_journal_begin_r */
enum {
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	JBEGIN_REG = 0,		/* regular journal begin */
	JBEGIN_JOIN = 1,	/* join the running transaction if at all possible */
	JBEGIN_ABORT = 2,	/* called from cleanup code, ignores aborted flag */
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};

static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
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			      struct super_block *p_s_sb,
			      unsigned long nblocks, int join);
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static void init_journal_hash(struct super_block *p_s_sb)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	memset(journal->j_hash_table, 0,
	       JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
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}

/*
** clears BH_Dirty and sticks the buffer on the clean list.  Called because I can't allow refile_buffer to
** make schedule happen after I've freed a block.  Look at remove_from_transaction and journal_mark_freed for
** more details.
*/
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static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
{
	if (bh) {
		clear_buffer_dirty(bh);
		clear_buffer_journal_test(bh);
	}
	return 0;
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}

static void disable_barrier(struct super_block *s)
{
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	REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
	printk("reiserfs: disabling flush barriers on %s\n",
	       reiserfs_bdevname(s));
}

static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
							 *p_s_sb)
{
	struct reiserfs_bitmap_node *bn;
	static int id;

	bn = reiserfs_kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS,
			      p_s_sb);
	if (!bn) {
		return NULL;
	}
	bn->data = reiserfs_kmalloc(p_s_sb->s_blocksize, GFP_NOFS, p_s_sb);
	if (!bn->data) {
		reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb);
		return NULL;
	}
	bn->id = id++;
	memset(bn->data, 0, p_s_sb->s_blocksize);
	INIT_LIST_HEAD(&bn->list);
	return bn;
}

static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *p_s_sb)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_bitmap_node *bn = NULL;
	struct list_head *entry = journal->j_bitmap_nodes.next;

	journal->j_used_bitmap_nodes++;
      repeat:

	if (entry != &journal->j_bitmap_nodes) {
		bn = list_entry(entry, struct reiserfs_bitmap_node, list);
		list_del(entry);
		memset(bn->data, 0, p_s_sb->s_blocksize);
		journal->j_free_bitmap_nodes--;
		return bn;
	}
	bn = allocate_bitmap_node(p_s_sb);
	if (!bn) {
		yield();
		goto repeat;
	}
	return bn;
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}
static inline void free_bitmap_node(struct super_block *p_s_sb,
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				    struct reiserfs_bitmap_node *bn)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	journal->j_used_bitmap_nodes--;
	if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
		reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb);
		reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb);
	} else {
		list_add(&bn->list, &journal->j_bitmap_nodes);
		journal->j_free_bitmap_nodes++;
	}
}

static void allocate_bitmap_nodes(struct super_block *p_s_sb)
{
	int i;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_bitmap_node *bn = NULL;
	for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
		bn = allocate_bitmap_node(p_s_sb);
		if (bn) {
			list_add(&bn->list, &journal->j_bitmap_nodes);
			journal->j_free_bitmap_nodes++;
		} else {
			break;	// this is ok, we'll try again when more are needed 
		}
	}
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}

static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
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				  struct reiserfs_list_bitmap *jb)
{
	int bmap_nr = block / (p_s_sb->s_blocksize << 3);
	int bit_nr = block % (p_s_sb->s_blocksize << 3);
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	if (!jb->bitmaps[bmap_nr]) {
		jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb);
	}
	set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
	return 0;
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}

static void cleanup_bitmap_list(struct super_block *p_s_sb,
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				struct reiserfs_list_bitmap *jb)
{
	int i;
	if (jb->bitmaps == NULL)
		return;

	for (i = 0; i < SB_BMAP_NR(p_s_sb); i++) {
		if (jb->bitmaps[i]) {
			free_bitmap_node(p_s_sb, jb->bitmaps[i]);
			jb->bitmaps[i] = NULL;
		}
	}
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}

/*
** only call this on FS unmount.
*/
static int free_list_bitmaps(struct super_block *p_s_sb,
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			     struct reiserfs_list_bitmap *jb_array)
{
	int i;
	struct reiserfs_list_bitmap *jb;
	for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
		jb = jb_array + i;
		jb->journal_list = NULL;
		cleanup_bitmap_list(p_s_sb, jb);
		vfree(jb->bitmaps);
		jb->bitmaps = NULL;
	}
	return 0;
}

static int free_bitmap_nodes(struct super_block *p_s_sb)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct list_head *next = journal->j_bitmap_nodes.next;
	struct reiserfs_bitmap_node *bn;

	while (next != &journal->j_bitmap_nodes) {
		bn = list_entry(next, struct reiserfs_bitmap_node, list);
		list_del(next);
		reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb);
		reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb);
		next = journal->j_bitmap_nodes.next;
		journal->j_free_bitmap_nodes--;
	}

	return 0;
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}

/*
** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. 
** jb_array is the array to be filled in.
*/
int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
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				   struct reiserfs_list_bitmap *jb_array,
				   int bmap_nr)
{
	int i;
	int failed = 0;
	struct reiserfs_list_bitmap *jb;
	int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);

	for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
		jb = jb_array + i;
		jb->journal_list = NULL;
		jb->bitmaps = vmalloc(mem);
		if (!jb->bitmaps) {
			reiserfs_warning(p_s_sb,
					 "clm-2000, unable to allocate bitmaps for journal lists");
			failed = 1;
			break;
		}
		memset(jb->bitmaps, 0, mem);
	}
	if (failed) {
		free_list_bitmaps(p_s_sb, jb_array);
		return -1;
	}
	return 0;
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}

/*
** find an available list bitmap.  If you can't find one, flush a commit list 
** and try again
*/
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static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *p_s_sb,
						    struct reiserfs_journal_list
						    *jl)
{
	int i, j;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_list_bitmap *jb = NULL;

	for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
		i = journal->j_list_bitmap_index;
		journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
		jb = journal->j_list_bitmap + i;
		if (journal->j_list_bitmap[i].journal_list) {
			flush_commit_list(p_s_sb,
					  journal->j_list_bitmap[i].
					  journal_list, 1);
			if (!journal->j_list_bitmap[i].journal_list) {
				break;
			}
		} else {
			break;
		}
	}
	if (jb->journal_list) {	/* double check to make sure if flushed correctly */
		return NULL;
	}
	jb->journal_list = jl;
	return jb;
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}

/* 
** allocates a new chunk of X nodes, and links them all together as a list.
** Uses the cnode->next and cnode->prev pointers
** returns NULL on failure
*/
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static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
{
	struct reiserfs_journal_cnode *head;
	int i;
	if (num_cnodes <= 0) {
		return NULL;
	}
	head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
	if (!head) {
		return NULL;
	}
	memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
	head[0].prev = NULL;
	head[0].next = head + 1;
	for (i = 1; i < num_cnodes; i++) {
		head[i].prev = head + (i - 1);
		head[i].next = head + (i + 1);	/* if last one, overwrite it after the if */
	}
	head[num_cnodes - 1].next = NULL;
	return head;
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}

/*
** pulls a cnode off the free list, or returns NULL on failure 
*/
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static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb)
{
	struct reiserfs_journal_cnode *cn;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);

	reiserfs_check_lock_depth(p_s_sb, "get_cnode");

	if (journal->j_cnode_free <= 0) {
		return NULL;
	}
	journal->j_cnode_used++;
	journal->j_cnode_free--;
	cn = journal->j_cnode_free_list;
	if (!cn) {
		return cn;
	}
	if (cn->next) {
		cn->next->prev = NULL;
	}
	journal->j_cnode_free_list = cn->next;
	memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
	return cn;
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}

/*
** returns a cnode to the free list 
*/
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static void free_cnode(struct super_block *p_s_sb,
		       struct reiserfs_journal_cnode *cn)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
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	reiserfs_check_lock_depth(p_s_sb, "free_cnode");
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	journal->j_cnode_used--;
	journal->j_cnode_free++;
	/* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
	cn->next = journal->j_cnode_free_list;
	if (journal->j_cnode_free_list) {
		journal->j_cnode_free_list->prev = cn;
	}
	cn->prev = NULL;	/* not needed with the memset, but I might kill the memset, and forget to do this */
	journal->j_cnode_free_list = cn;
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}

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static void clear_prepared_bits(struct buffer_head *bh)
{
	clear_buffer_journal_prepared(bh);
	clear_buffer_journal_restore_dirty(bh);
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}

/* utility function to force a BUG if it is called without the big
** kernel lock held.  caller is the string printed just before calling BUG()
*/
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void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
{
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#ifdef CONFIG_SMP
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	if (current->lock_depth < 0) {
		reiserfs_panic(sb, "%s called without kernel lock held",
			       caller);
	}
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#else
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	;
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#endif
}

/* return a cnode with same dev, block number and size in table, or null if not found */
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static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
								  super_block
								  *sb,
								  struct
								  reiserfs_journal_cnode
								  **table,
								  long bl)
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{
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	struct reiserfs_journal_cnode *cn;
	cn = journal_hash(table, sb, bl);
	while (cn) {
		if (cn->blocknr == bl && cn->sb == sb)
			return cn;
		cn = cn->hnext;
	}
	return (struct reiserfs_journal_cnode *)0;
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}

/*
** this actually means 'can this block be reallocated yet?'.  If you set search_all, a block can only be allocated
** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
** being overwritten by a replay after crashing.
**
** If you don't set search_all, a block can only be allocated if it is not in the current transaction.  Since deleting
** a block removes it from the current transaction, this case should never happen.  If you don't set search_all, make
** sure you never write the block without logging it.
**
** next_zero_bit is a suggestion about the next block to try for find_forward.
** when bl is rejected because it is set in a journal list bitmap, we search
** for the next zero bit in the bitmap that rejected bl.  Then, we return that
** through next_zero_bit for find_forward to try.
**
** Just because we return something in next_zero_bit does not mean we won't
** reject it on the next call to reiserfs_in_journal
**
*/
int reiserfs_in_journal(struct super_block *p_s_sb,
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			int bmap_nr, int bit_nr, int search_all,
			b_blocknr_t * next_zero_bit)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_cnode *cn;
	struct reiserfs_list_bitmap *jb;
	int i;
	unsigned long bl;

	*next_zero_bit = 0;	/* always start this at zero. */

	PROC_INFO_INC(p_s_sb, journal.in_journal);
	/* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
	 ** if we crash before the transaction that freed it commits,  this transaction won't
	 ** have committed either, and the block will never be written
	 */
	if (search_all) {
		for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
			PROC_INFO_INC(p_s_sb, journal.in_journal_bitmap);
			jb = journal->j_list_bitmap + i;
			if (jb->journal_list && jb->bitmaps[bmap_nr] &&
			    test_bit(bit_nr,
				     (unsigned long *)jb->bitmaps[bmap_nr]->
				     data)) {
				*next_zero_bit =
				    find_next_zero_bit((unsigned long *)
						       (jb->bitmaps[bmap_nr]->
							data),
						       p_s_sb->s_blocksize << 3,
						       bit_nr + 1);
				return 1;
			}
		}
	}

	bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
	/* is it in any old transactions? */
	if (search_all
	    && (cn =
		get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, bl))) {
		return 1;
	}

	/* is it in the current transaction.  This should never happen */
	if ((cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, bl))) {
		BUG();
		return 1;
	}

	PROC_INFO_INC(p_s_sb, journal.in_journal_reusable);
	/* safe for reuse */
	return 0;
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}

/* insert cn into table
*/
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static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
				       struct reiserfs_journal_cnode *cn)
{
	struct reiserfs_journal_cnode *cn_orig;
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	cn_orig = journal_hash(table, cn->sb, cn->blocknr);
	cn->hnext = cn_orig;
	cn->hprev = NULL;
	if (cn_orig) {
		cn_orig->hprev = cn;
	}
	journal_hash(table, cn->sb, cn->blocknr) = cn;
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}

/* lock the current transaction */
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static inline void lock_journal(struct super_block *p_s_sb)
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{
	PROC_INFO_INC(p_s_sb, journal.lock_journal);
	down(&SB_JOURNAL(p_s_sb)->j_lock);
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}

/* unlock the current transaction */
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static inline void unlock_journal(struct super_block *p_s_sb)
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{
	up(&SB_JOURNAL(p_s_sb)->j_lock);
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}

static inline void get_journal_list(struct reiserfs_journal_list *jl)
{
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	jl->j_refcount++;
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}

static inline void put_journal_list(struct super_block *s,
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				    struct reiserfs_journal_list *jl)
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{
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	if (jl->j_refcount < 1) {
		reiserfs_panic(s, "trans id %lu, refcount at %d",
			       jl->j_trans_id, jl->j_refcount);
	}
	if (--jl->j_refcount == 0)
		reiserfs_kfree(jl, sizeof(struct reiserfs_journal_list), s);
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}

/*
** this used to be much more involved, and I'm keeping it just in case things get ugly again.
** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
** transaction.
*/
592 593 594
static void cleanup_freed_for_journal_list(struct super_block *p_s_sb,
					   struct reiserfs_journal_list *jl)
{
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	struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
	if (jb) {
		cleanup_bitmap_list(p_s_sb, jb);
	}
	jl->j_list_bitmap->journal_list = NULL;
	jl->j_list_bitmap = NULL;
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}

static int journal_list_still_alive(struct super_block *s,
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				    unsigned long trans_id)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	struct list_head *entry = &journal->j_journal_list;
	struct reiserfs_journal_list *jl;

	if (!list_empty(entry)) {
		jl = JOURNAL_LIST_ENTRY(entry->next);
		if (jl->j_trans_id <= trans_id) {
			return 1;
		}
	}
	return 0;
}

static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
{
	char b[BDEVNAME_SIZE];

	if (buffer_journaled(bh)) {
		reiserfs_warning(NULL,
				 "clm-2084: pinned buffer %lu:%s sent to disk",
				 bh->b_blocknr, bdevname(bh->b_bdev, b));
	}
	if (uptodate)
		set_buffer_uptodate(bh);
	else
		clear_buffer_uptodate(bh);
	unlock_buffer(bh);
	put_bh(bh);
}

static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
{
	if (uptodate)
		set_buffer_uptodate(bh);
	else
		clear_buffer_uptodate(bh);
	unlock_buffer(bh);
	put_bh(bh);
}

static void submit_logged_buffer(struct buffer_head *bh)
{
	get_bh(bh);
	bh->b_end_io = reiserfs_end_buffer_io_sync;
	clear_buffer_journal_new(bh);
	clear_buffer_dirty(bh);
	if (!test_clear_buffer_journal_test(bh))
		BUG();
	if (!buffer_uptodate(bh))
		BUG();
	submit_bh(WRITE, bh);
}

static void submit_ordered_buffer(struct buffer_head *bh)
{
	get_bh(bh);
	bh->b_end_io = reiserfs_end_ordered_io;
	clear_buffer_dirty(bh);
	if (!buffer_uptodate(bh))
		BUG();
	submit_bh(WRITE, bh);
}

static int submit_barrier_buffer(struct buffer_head *bh)
{
	get_bh(bh);
	bh->b_end_io = reiserfs_end_ordered_io;
	clear_buffer_dirty(bh);
	if (!buffer_uptodate(bh))
		BUG();
	return submit_bh(WRITE_BARRIER, bh);
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}

static void check_barrier_completion(struct super_block *s,
681 682 683 684 685 686 687 688 689
				     struct buffer_head *bh)
{
	if (buffer_eopnotsupp(bh)) {
		clear_buffer_eopnotsupp(bh);
		disable_barrier(s);
		set_buffer_uptodate(bh);
		set_buffer_dirty(bh);
		sync_dirty_buffer(bh);
	}
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}

#define CHUNK_SIZE 32
struct buffer_chunk {
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	struct buffer_head *bh[CHUNK_SIZE];
	int nr;
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};

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static void write_chunk(struct buffer_chunk *chunk)
{
	int i;
	get_fs_excl();
	for (i = 0; i < chunk->nr; i++) {
		submit_logged_buffer(chunk->bh[i]);
	}
	chunk->nr = 0;
	put_fs_excl();
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}

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static void write_ordered_chunk(struct buffer_chunk *chunk)
{
	int i;
	get_fs_excl();
	for (i = 0; i < chunk->nr; i++) {
		submit_ordered_buffer(chunk->bh[i]);
	}
	chunk->nr = 0;
	put_fs_excl();
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}

static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
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			spinlock_t * lock, void (fn) (struct buffer_chunk *))
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{
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	int ret = 0;
	if (chunk->nr >= CHUNK_SIZE)
		BUG();
	chunk->bh[chunk->nr++] = bh;
	if (chunk->nr >= CHUNK_SIZE) {
		ret = 1;
		if (lock)
			spin_unlock(lock);
		fn(chunk);
		if (lock)
			spin_lock(lock);
	}
	return ret;
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}

static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
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static struct reiserfs_jh *alloc_jh(void)
{
	struct reiserfs_jh *jh;
	while (1) {
		jh = kmalloc(sizeof(*jh), GFP_NOFS);
		if (jh) {
			atomic_inc(&nr_reiserfs_jh);
			return jh;
		}
		yield();
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	}
}

/*
 * we want to free the jh when the buffer has been written
 * and waited on
 */
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void reiserfs_free_jh(struct buffer_head *bh)
{
	struct reiserfs_jh *jh;

	jh = bh->b_private;
	if (jh) {
		bh->b_private = NULL;
		jh->bh = NULL;
		list_del_init(&jh->list);
		kfree(jh);
		if (atomic_read(&nr_reiserfs_jh) <= 0)
			BUG();
		atomic_dec(&nr_reiserfs_jh);
		put_bh(bh);
	}
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}

static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
774
			   int tail)
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{
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	struct reiserfs_jh *jh;
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	if (bh->b_private) {
		spin_lock(&j->j_dirty_buffers_lock);
		if (!bh->b_private) {
			spin_unlock(&j->j_dirty_buffers_lock);
			goto no_jh;
		}
		jh = bh->b_private;
		list_del_init(&jh->list);
	} else {
	      no_jh:
		get_bh(bh);
		jh = alloc_jh();
		spin_lock(&j->j_dirty_buffers_lock);
		/* buffer must be locked for __add_jh, should be able to have
		 * two adds at the same time
		 */
		if (bh->b_private)
			BUG();
		jh->bh = bh;
		bh->b_private = jh;
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	}
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	jh->jl = j->j_current_jl;
	if (tail)
		list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
	else {
		list_add_tail(&jh->list, &jh->jl->j_bh_list);
	}
	spin_unlock(&j->j_dirty_buffers_lock);
	return 0;
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}

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int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
{
	return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
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}
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int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
{
	return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
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}

#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
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static int write_ordered_buffers(spinlock_t * lock,
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				 struct reiserfs_journal *j,
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				 struct reiserfs_journal_list *jl,
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				 struct list_head *list)
{
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	struct buffer_head *bh;
	struct reiserfs_jh *jh;
	int ret = j->j_errno;
	struct buffer_chunk chunk;
	struct list_head tmp;
	INIT_LIST_HEAD(&tmp);

	chunk.nr = 0;
	spin_lock(lock);
	while (!list_empty(list)) {
		jh = JH_ENTRY(list->next);
		bh = jh->bh;
		get_bh(bh);
		if (test_set_buffer_locked(bh)) {
			if (!buffer_dirty(bh)) {
				list_del_init(&jh->list);
				list_add(&jh->list, &tmp);
				goto loop_next;
			}
			spin_unlock(lock);
			if (chunk.nr)
				write_ordered_chunk(&chunk);
			wait_on_buffer(bh);
			cond_resched();
			spin_lock(lock);
			goto loop_next;
		}
		if (buffer_dirty(bh)) {
			list_del_init(&jh->list);
			list_add(&jh->list, &tmp);
			add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
		} else {
			reiserfs_free_jh(bh);
			unlock_buffer(bh);
		}
	      loop_next:
		put_bh(bh);
		cond_resched_lock(lock);
	}
	if (chunk.nr) {
		spin_unlock(lock);
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		write_ordered_chunk(&chunk);
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		spin_lock(lock);
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	}
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	while (!list_empty(&tmp)) {
		jh = JH_ENTRY(tmp.prev);
		bh = jh->bh;
		get_bh(bh);
		reiserfs_free_jh(bh);

		if (buffer_locked(bh)) {
			spin_unlock(lock);
			wait_on_buffer(bh);
			spin_lock(lock);
		}
		if (!buffer_uptodate(bh)) {
			ret = -EIO;
		}
		put_bh(bh);
		cond_resched_lock(lock);
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	}
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	spin_unlock(lock);
	return ret;
}
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static int flush_older_commits(struct super_block *s,
			       struct reiserfs_journal_list *jl)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	struct reiserfs_journal_list *other_jl;
	struct reiserfs_journal_list *first_jl;
	struct list_head *entry;
	unsigned long trans_id = jl->j_trans_id;
	unsigned long other_trans_id;
	unsigned long first_trans_id;

      find_first:
	/*
	 * first we walk backwards to find the oldest uncommitted transation
	 */
	first_jl = jl;
	entry = jl->j_list.prev;
	while (1) {
		other_jl = JOURNAL_LIST_ENTRY(entry);
		if (entry == &journal->j_journal_list ||
		    atomic_read(&other_jl->j_older_commits_done))
			break;
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		first_jl = other_jl;
		entry = other_jl->j_list.prev;
	}
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	/* if we didn't find any older uncommitted transactions, return now */
	if (first_jl == jl) {
		return 0;
	}
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	first_trans_id = first_jl->j_trans_id;

	entry = &first_jl->j_list;
	while (1) {
		other_jl = JOURNAL_LIST_ENTRY(entry);
		other_trans_id = other_jl->j_trans_id;

		if (other_trans_id < trans_id) {
			if (atomic_read(&other_jl->j_commit_left) != 0) {
				flush_commit_list(s, other_jl, 0);

				/* list we were called with is gone, return */
				if (!journal_list_still_alive(s, trans_id))
					return 1;

				/* the one we just flushed is gone, this means all
				 * older lists are also gone, so first_jl is no longer
				 * valid either.  Go back to the beginning.
				 */
				if (!journal_list_still_alive
				    (s, other_trans_id)) {
					goto find_first;
				}
			}
			entry = entry->next;
			if (entry == &journal->j_journal_list)
				return 0;
		} else {
			return 0;
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		}
	}
952
	return 0;
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}
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int reiserfs_async_progress_wait(struct super_block *s)
{
	DEFINE_WAIT(wait);
	struct reiserfs_journal *j = SB_JOURNAL(s);
	if (atomic_read(&j->j_async_throttle))
		blk_congestion_wait(WRITE, HZ / 10);
	return 0;
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}

/*
** if this journal list still has commit blocks unflushed, send them to disk.
**
** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
** Before the commit block can by written, every other log block must be safely on disk
**
*/
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static int flush_commit_list(struct super_block *s,
			     struct reiserfs_journal_list *jl, int flushall)
{
	int i;
	int bn;
	struct buffer_head *tbh = NULL;
	unsigned long trans_id = jl->j_trans_id;
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	int barrier = 0;
	int retval = 0;

	reiserfs_check_lock_depth(s, "flush_commit_list");

	if (atomic_read(&jl->j_older_commits_done)) {
		return 0;
	}

	get_fs_excl();

	/* before we can put our commit blocks on disk, we have to make sure everyone older than
	 ** us is on disk too
	 */
	BUG_ON(jl->j_len <= 0);
	BUG_ON(trans_id == journal->j_trans_id);

	get_journal_list(jl);
	if (flushall) {
		if (flush_older_commits(s, jl) == 1) {
			/* list disappeared during flush_older_commits.  return */
			goto put_jl;
		}
	}

	/* make sure nobody is trying to flush this one at the same time */
	down(&jl->j_commit_lock);
	if (!journal_list_still_alive(s, trans_id)) {
		up(&jl->j_commit_lock);
		goto put_jl;
	}
	BUG_ON(jl->j_trans_id == 0);

	/* this commit is done, exit */
	if (atomic_read(&(jl->j_commit_left)) <= 0) {
		if (flushall) {
			atomic_set(&(jl->j_older_commits_done), 1);
		}
		up(&jl->j_commit_lock);
		goto put_jl;
	}

	if (!list_empty(&jl->j_bh_list)) {
		unlock_kernel();
		write_ordered_buffers(&journal->j_dirty_buffers_lock,
				      journal, jl, &jl->j_bh_list);
		lock_kernel();
	}
	BUG_ON(!list_empty(&jl->j_bh_list));
	/*
	 * for the description block and all the log blocks, submit any buffers
	 * that haven't already reached the disk
	 */
	atomic_inc(&journal->j_async_throttle);
	for (i = 0; i < (jl->j_len + 1); i++) {
		bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
		    SB_ONDISK_JOURNAL_SIZE(s);
		tbh = journal_find_get_block(s, bn);
		if (buffer_dirty(tbh))	/* redundant, ll_rw_block() checks */
1037
			ll_rw_block(SWRITE, 1, &tbh);
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		put_bh(tbh);
	}
	atomic_dec(&journal->j_async_throttle);

	/* wait on everything written so far before writing the commit
	 * if we are in barrier mode, send the commit down now
	 */
	barrier = reiserfs_barrier_flush(s);
	if (barrier) {
		int ret;
		lock_buffer(jl->j_commit_bh);
		ret = submit_barrier_buffer(jl->j_commit_bh);
		if (ret == -EOPNOTSUPP) {
			set_buffer_uptodate(jl->j_commit_bh);
			disable_barrier(s);
			barrier = 0;
		}
	}
	for (i = 0; i < (jl->j_len + 1); i++) {
		bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
		    (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
		tbh = journal_find_get_block(s, bn);
		wait_on_buffer(tbh);
		// since we're using ll_rw_blk above, it might have skipped over
		// a locked buffer.  Double check here
		//
		if (buffer_dirty(tbh))	/* redundant, sync_dirty_buffer() checks */
			sync_dirty_buffer(tbh);
		if (unlikely(!buffer_uptodate(tbh))) {
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#ifdef CONFIG_REISERFS_CHECK
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			reiserfs_warning(s, "journal-601, buffer write failed");
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#endif
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			retval = -EIO;
		}
		put_bh(tbh);	/* once for journal_find_get_block */
		put_bh(tbh);	/* once due to original getblk in do_journal_end */
		atomic_dec(&(jl->j_commit_left));
	}

	BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);

	if (!barrier) {
		if (buffer_dirty(jl->j_commit_bh))
			BUG();
		mark_buffer_dirty(jl->j_commit_bh);
		sync_dirty_buffer(jl->j_commit_bh);
	} else
		wait_on_buffer(jl->j_commit_bh);

	check_barrier_completion(s, jl->j_commit_bh);

	/* If there was a write error in the journal - we can't commit this
	 * transaction - it will be invalid and, if successful, will just end
	 * up propogating the write error out to the filesystem. */
	if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
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#ifdef CONFIG_REISERFS_CHECK
1094
		reiserfs_warning(s, "journal-615: buffer write failed");
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#endif
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		retval = -EIO;
	}
	bforget(jl->j_commit_bh);
	if (journal->j_last_commit_id != 0 &&
	    (jl->j_trans_id - journal->j_last_commit_id) != 1) {
		reiserfs_warning(s, "clm-2200: last commit %lu, current %lu",
				 journal->j_last_commit_id, jl->j_trans_id);
	}
	journal->j_last_commit_id = jl->j_trans_id;

	/* now, every commit block is on the disk.  It is safe to allow blocks freed during this transaction to be reallocated */
	cleanup_freed_for_journal_list(s, jl);

	retval = retval ? retval : journal->j_errno;

	/* mark the metadata dirty */
	if (!retval)
		dirty_one_transaction(s, jl);
	atomic_dec(&(jl->j_commit_left));

	if (flushall) {
		atomic_set(&(jl->j_older_commits_done), 1);
	}
	up(&jl->j_commit_lock);
      put_jl:
	put_journal_list(s, jl);

	if (retval)
		reiserfs_abort(s, retval, "Journal write error in %s",
			       __FUNCTION__);
	put_fs_excl();
	return retval;
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}

/*
** flush_journal_list frequently needs to find a newer transaction for a given block.  This does that, or 
** returns NULL if it can't find anything 
*/
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static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
							  reiserfs_journal_cnode
							  *cn)
{
	struct super_block *sb = cn->sb;
	b_blocknr_t blocknr = cn->blocknr;
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	cn = cn->hprev;
	while (cn) {
		if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
			return cn->jlist;
		}
		cn = cn->hprev;
	}
	return NULL;
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}

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static void remove_journal_hash(struct super_block *,
				struct reiserfs_journal_cnode **,
				struct reiserfs_journal_list *, unsigned long,
				int);
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/*
** once all the real blocks have been flushed, it is safe to remove them from the
** journal list for this transaction.  Aside from freeing the cnode, this also allows the
** block to be reallocated for data blocks if it had been deleted.
*/
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static void remove_all_from_journal_list(struct super_block *p_s_sb,
					 struct reiserfs_journal_list *jl,
					 int debug)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_cnode *cn, *last;
	cn = jl->j_realblock;

	/* which is better, to lock once around the whole loop, or
	 ** to lock for each call to remove_journal_hash?
	 */
	while (cn) {
		if (cn->blocknr != 0) {
			if (debug) {
				reiserfs_warning(p_s_sb,
						 "block %u, bh is %d, state %ld",
						 cn->blocknr, cn->bh ? 1 : 0,
						 cn->state);
			}
			cn->state = 0;
			remove_journal_hash(p_s_sb, journal->j_list_hash_table,
					    jl, cn->blocknr, 1);
		}
		last = cn;
		cn = cn->next;
		free_cnode(p_s_sb, last);
	}
	jl->j_realblock = NULL;
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}

/*
** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
** releasing blocks in this transaction for reuse as data blocks.
** called by flush_journal_list, before it calls remove_all_from_journal_list
**
*/
1198 1199 1200 1201 1202 1203
static int _update_journal_header_block(struct super_block *p_s_sb,
					unsigned long offset,
					unsigned long trans_id)
{
	struct reiserfs_journal_header *jh;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
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	if (reiserfs_is_journal_aborted(journal))
		return -EIO;
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1208 1209 1210 1211
	if (trans_id >= journal->j_last_flush_trans_id) {
		if (buffer_locked((journal->j_header_bh))) {
			wait_on_buffer((journal->j_header_bh));
			if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
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#ifdef CONFIG_REISERFS_CHECK
1213 1214
				reiserfs_warning(p_s_sb,
						 "journal-699: buffer write failed");
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#endif
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
				return -EIO;
			}
		}
		journal->j_last_flush_trans_id = trans_id;
		journal->j_first_unflushed_offset = offset;
		jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
							b_data);
		jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
		jh->j_first_unflushed_offset = cpu_to_le32(offset);
		jh->j_mount_id = cpu_to_le32(journal->j_mount_id);

		if (reiserfs_barrier_flush(p_s_sb)) {
			int ret;
			lock_buffer(journal->j_header_bh);
			ret = submit_barrier_buffer(journal->j_header_bh);
			if (ret == -EOPNOTSUPP) {
				set_buffer_uptodate(journal->j_header_bh);
				disable_barrier(p_s_sb);
				goto sync;
			}
			wait_on_buffer(journal->j_header_bh);
			check_barrier_completion(p_s_sb, journal->j_header_bh);
		} else {
		      sync:
			set_buffer_dirty(journal->j_header_bh);
			sync_dirty_buffer(journal->j_header_bh);
		}
		if (!buffer_uptodate(journal->j_header_bh)) {
			reiserfs_warning(p_s_sb,
					 "journal-837: IO error during journal replay");
			return -EIO;
		}
	}
	return 0;
}

static int update_journal_header_block(struct super_block *p_s_sb,
				       unsigned long offset,
				       unsigned long trans_id)
{
	return _update_journal_header_block(p_s_sb, offset, trans_id);
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}
1258

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/* 
** flush any and all journal lists older than you are 
** can only be called from flush_journal_list
*/
static int flush_older_journal_lists(struct super_block *p_s_sb,
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
				     struct reiserfs_journal_list *jl)
{
	struct list_head *entry;
	struct reiserfs_journal_list *other_jl;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	unsigned long trans_id = jl->j_trans_id;

	/* we know we are the only ones flushing things, no extra race
	 * protection is required.
	 */
      restart:
	entry = journal->j_journal_list.next;
	/* Did we wrap? */
	if (entry == &journal->j_journal_list)
		return 0;
	other_jl = JOURNAL_LIST_ENTRY(entry);
	if (other_jl->j_trans_id < trans_id) {
		BUG_ON(other_jl->j_refcount <= 0);
		/* do not flush all */
		flush_journal_list(p_s_sb, other_jl, 0);

		/* other_jl is now deleted from the list */
		goto restart;
	}
	return 0;
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}

static void del_from_work_list(struct super_block *s,
1292 1293 1294 1295 1296 1297 1298
			       struct reiserfs_journal_list *jl)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	if (!list_empty(&jl->j_working_list)) {
		list_del_init(&jl->j_working_list);
		journal->j_num_work_lists--;
	}
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}

/* flush a journal list, both commit and real blocks
**
** always set flushall to 1, unless you are calling from inside
** flush_journal_list
**
** IMPORTANT.  This can only be called while there are no journal writers, 
** and the journal is locked.  That means it can only be called from 
** do_journal_end, or by journal_release
*/
1310 1311
static int flush_journal_list(struct super_block *s,
			      struct reiserfs_journal_list *jl, int flushall)
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{
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
	struct reiserfs_journal_list *pjl;
	struct reiserfs_journal_cnode *cn, *last;
	int count;
	int was_jwait = 0;
	int was_dirty = 0;
	struct buffer_head *saved_bh;
	unsigned long j_len_saved = jl->j_len;
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	int err = 0;

	BUG_ON(j_len_saved <= 0);

	if (atomic_read(&journal->j_wcount) != 0) {
		reiserfs_warning(s,
				 "clm-2048: flush_journal_list called with wcount %d",
				 atomic_read(&journal->j_wcount));
	}
	BUG_ON(jl->j_trans_id == 0);
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1332 1333 1334 1335 1336 1337
	/* if flushall == 0, the lock is already held */
	if (flushall) {
		down(&journal->j_flush_sem);
	} else if (!down_trylock(&journal->j_flush_sem)) {
		BUG();
	}
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1339 1340 1341 1342 1343 1344 1345
	count = 0;
	if (j_len_saved > journal->j_trans_max) {
		reiserfs_panic(s,
			       "journal-715: flush_journal_list, length is %lu, trans id %lu\n",
			       j_len_saved, jl->j_trans_id);
		return 0;
	}
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1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
	get_fs_excl();

	/* if all the work is already done, get out of here */
	if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
	    atomic_read(&(jl->j_commit_left)) <= 0) {
		goto flush_older_and_return;
	}

	/* start by putting the commit list on disk.  This will also flush 
	 ** the commit lists of any olders transactions
	 */
	flush_commit_list(s, jl, 1);

	if (!(jl->j_state & LIST_DIRTY)
	    && !reiserfs_is_journal_aborted(journal))
		BUG();

	/* are we done now? */
	if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
	    atomic_read(&(jl->j_commit_left)) <= 0) {
		goto flush_older_and_return;
	}

	/* loop through each cnode, see if we need to write it, 
	 ** or wait on a more recent transaction, or just ignore it 
	 */
	if (atomic_read(&(journal->j_wcount)) != 0) {
		reiserfs_panic(s,
			       "journal-844: panic journal list is flushing, wcount is not 0\n");
	}
	cn = jl->j_realblock;
	while (cn) {
		was_jwait = 0;
		was_dirty = 0;
		saved_bh = NULL;
		/* blocknr of 0 is no longer in the hash, ignore it */
		if (cn->blocknr == 0) {
			goto free_cnode;
		}

		/* This transaction failed commit. Don't write out to the disk */
		if (!(jl->j_state & LIST_DIRTY))
			goto free_cnode;

		pjl = find_newer_jl_for_cn(cn);
		/* the order is important here.  We check pjl to make sure we
		 ** don't clear BH_JDirty_wait if we aren't the one writing this
		 ** block to disk
		 */
		if (!pjl && cn->bh) {
			saved_bh = cn->bh;

			/* we do this to make sure nobody releases the buffer while 
			 ** we are working with it 
			 */
			get_bh(saved_bh);

			if (buffer_journal_dirty(saved_bh)) {
				BUG_ON(!can_dirty(cn));
				was_jwait = 1;
				was_dirty = 1;
			} else if (can_dirty(cn)) {
				/* everything with !pjl && jwait should be writable */
				BUG();
			}
		}

		/* if someone has this block in a newer transaction, just make
		 ** sure they are commited, and don't try writing it to disk
		 */
		if (pjl) {
			if (atomic_read(&pjl->j_commit_left))
				flush_commit_list(s, pjl, 1);
			goto free_cnode;
		}

		/* bh == NULL when the block got to disk on its own, OR, 
		 ** the block got freed in a future transaction 
		 */
		if (saved_bh == NULL) {
			goto free_cnode;
		}

		/* this should never happen.  kupdate_one_transaction has this list
		 ** locked while it works, so we should never see a buffer here that
		 ** is not marked JDirty_wait
		 */
		if ((!was_jwait) && !buffer_locked(saved_bh)) {
			reiserfs_warning(s,
					 "journal-813: BAD! buffer %llu %cdirty %cjwait, "
					 "not in a newer tranasction",
					 (unsigned long long)saved_bh->
					 b_blocknr, was_dirty ? ' ' : '!',
					 was_jwait ? ' ' : '!');
		}
		if (was_dirty) {
			/* we inc again because saved_bh gets decremented at free_cnode */
			get_bh(saved_bh);
			set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
			lock_buffer(saved_bh);
			BUG_ON(cn->blocknr != saved_bh->b_blocknr);
			if (buffer_dirty(saved_bh))
				submit_logged_buffer(saved_bh);
			else
				unlock_buffer(saved_bh);
			count++;
		} else {
			reiserfs_warning(s,
					 "clm-2082: Unable to flush buffer %llu in %s",
					 (unsigned long long)saved_bh->
					 b_blocknr, __FUNCTION__);
		}
	      free_cnode:
		last = cn;
		cn = cn->next;
		if (saved_bh) {
			/* we incremented this to keep others from taking the buffer head away */
			put_bh(saved_bh);
			if (atomic_read(&(saved_bh->b_count)) < 0) {
				reiserfs_warning(s,
						 "journal-945: saved_bh->b_count < 0");
			}
		}
	}
	if (count > 0) {
		cn = jl->j_realblock;
		while (cn) {
			if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
				if (!cn->bh) {
					reiserfs_panic(s,
						       "journal-1011: cn->bh is NULL\n");
				}
				wait_on_buffer(cn->bh);
				if (!cn->bh) {
					reiserfs_panic(s,
						       "journal-1012: cn->bh is NULL\n");
				}
				if (unlikely(!buffer_uptodate(cn->bh))) {
#ifdef CONFIG_REISERFS_CHECK
					reiserfs_warning(s,
							 "journal-949: buffer write failed\n");
#endif
					err = -EIO;
				}
				/* note, we must clear the JDirty_wait bit after the up to date
				 ** check, otherwise we race against our flushpage routine
				 */
				BUG_ON(!test_clear_buffer_journal_dirty
				       (cn->bh));

				/* undo the inc from journal_mark_dirty */
				put_bh(cn->bh);
				brelse(cn->bh);
			}
			cn = cn->next;
		}
	}

	if (err)
		reiserfs_abort(s, -EIO,
			       "Write error while pushing transaction to disk in %s",
			       __FUNCTION__);
      flush_older_and_return:

	/* before we can update the journal header block, we _must_ flush all 
	 ** real blocks from all older transactions to disk.  This is because
	 ** once the header block is updated, this transaction will not be
	 ** replayed after a crash
	 */
	if (flushall) {
		flush_older_journal_lists(s, jl);
	}

	err = journal->j_errno;
	/* before we can remove everything from the hash tables for this 
	 ** transaction, we must make sure it can never be replayed
	 **
	 ** since we are only called from do_journal_end, we know for sure there
	 ** are no allocations going on while we are flushing journal lists.  So,
	 ** we only need to update the journal header block for the last list
	 ** being flushed
	 */
	if (!err && flushall) {
		err =
		    update_journal_header_block(s,
						(jl->j_start + jl->j_len +
						 2) % SB_ONDISK_JOURNAL_SIZE(s),
						jl->j_trans_id);
		if (err)
			reiserfs_abort(s, -EIO,
				       "Write error while updating journal header in %s",
				       __FUNCTION__);
	}
	remove_all_from_journal_list(s, jl, 0);
	list_del_init(&jl->j_list);
	journal->j_num_lists--;
	del_from_work_list(s, jl);

	if (journal->j_last_flush_id != 0 &&
	    (jl->j_trans_id - journal->j_last_flush_id) != 1) {
		reiserfs_warning(s, "clm-2201: last flush %lu, current %lu",
				 journal->j_last_flush_id, jl->j_trans_id);
	}
	journal->j_last_flush_id = jl->j_trans_id;

	/* not strictly required since we are freeing the list, but it should
	 * help find code using dead lists later on
	 */
	jl->j_len = 0;
	atomic_set(&(jl->j_nonzerolen), 0);
	jl->j_start = 0;
	jl->j_realblock = NULL;
	jl->j_commit_bh = NULL;
	jl->j_trans_id = 0;
	jl->j_state = 0;
	put_journal_list(s, jl);
	if (flushall)
		up(&journal->j_flush_sem);
	put_fs_excl();
	return err;
}

static int write_one_transaction(struct super_block *s,
				 struct reiserfs_journal_list *jl,
				 struct buffer_chunk *chunk)
{
	struct reiserfs_journal_cnode *cn;
	int ret = 0;

	jl->j_state |= LIST_TOUCHED;
	del_from_work_list(s, jl);
	if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
		return 0;
	}

	cn = jl->j_realblock;
	while (cn) {
		/* if the blocknr == 0, this has been cleared from the hash,
		 ** skip it
		 */
		if (cn->blocknr == 0) {
			goto next;
		}
		if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
			struct buffer_head *tmp_bh;
			/* we can race against journal_mark_freed when we try
			 * to lock_buffer(cn->bh), so we have to inc the buffer
			 * count, and recheck things after locking
			 */
			tmp_bh = cn->bh;
			get_bh(tmp_bh);
			lock_buffer(tmp_bh);
			if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
				if (!buffer_journal_dirty(tmp_bh) ||
				    buffer_journal_prepared(tmp_bh))
					BUG();
				add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
				ret++;
			} else {
				/* note, cn->bh might be null now */
				unlock_buffer(tmp_bh);
			}
			put_bh(tmp_bh);
		}
	      next:
		cn = cn->next;
		cond_resched();
	}
	return ret;
}

/* used by flush_commit_list */
static int dirty_one_transaction(struct super_block *s,
				 struct reiserfs_journal_list *jl)
{
	struct reiserfs_journal_cnode *cn;
	struct reiserfs_journal_list *pjl;
	int ret = 0;

	jl->j_state |= LIST_DIRTY;
	cn = jl->j_realblock;
	while (cn) {
		/* look for a more recent transaction that logged this
		 ** buffer.  Only the most recent transaction with a buffer in
		 ** it is allowed to send that buffer to disk
		 */
		pjl = find_newer_jl_for_cn(cn);
		if (!pjl && cn->blocknr && cn->bh
		    && buffer_journal_dirty(cn->bh)) {
			BUG_ON(!can_dirty(cn));
			/* if the buffer is prepared, it will either be logged
			 * or restored.  If restored, we need to make sure
			 * it actually gets marked dirty
			 */
			clear_buffer_journal_new(cn->bh);
			if (buffer_journal_prepared(cn->bh)) {
				set_buffer_journal_restore_dirty(cn->bh);
			} else {
				set_buffer_journal_test(cn->bh);
				mark_buffer_dirty(cn->bh);
			}
		}
		cn = cn->next;
	}
	return ret;
}

static int kupdate_transactions(struct super_block *s,
				struct reiserfs_journal_list *jl,
				struct reiserfs_journal_list **next_jl,
				unsigned long *next_trans_id,
				int num_blocks, int num_trans)
{
	int ret = 0;
	int written = 0;
	int transactions_flushed = 0;
	unsigned long orig_trans_id = jl->j_trans_id;
	struct buffer_chunk chunk;
	struct list_head *entry;
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	chunk.nr = 0;

	down(&journal->j_flush_sem);
	if (!journal_list_still_alive(s, orig_trans_id)) {
		goto done;
	}

	/* we've got j_flush_sem held, nobody is going to delete any
	 * of these lists out from underneath us
	 */
	while ((num_trans && transactions_flushed < num_trans) ||
	       (!num_trans && written < num_blocks)) {

		if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
		    atomic_read(&jl->j_commit_left)
		    || !(jl->j_state & LIST_DIRTY)) {
			del_from_work_list(s, jl);
			break;
		}
		ret = write_one_transaction(s, jl, &chunk);

		if (ret < 0)
			goto done;
		transactions_flushed++;
		written += ret;
		entry = jl->j_list.next;

		/* did we wrap? */
		if (entry == &journal->j_journal_list) {
			break;
		}
		jl = JOURNAL_LIST_ENTRY(entry);

		/* don't bother with older transactions */
		if (jl->j_trans_id <= orig_trans_id)
			break;
	}
	if (chunk.nr) {
		write_chunk(&chunk);
	}

      done:
	up(&journal->j_flush_sem);
	return ret;
}

/* for o_sync and fsync heavy applications, they tend to use
** all the journa list slots with tiny transactions.  These
** trigger lots and lots of calls to update the header block, which
** adds seeks and slows things down.
**
** This function tries to clear out a large chunk of the journal lists
** at once, which makes everything faster since only the newest journal
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Linus Torvalds 已提交
1720 1721 1722
** list updates the header block
*/
static int flush_used_journal_lists(struct super_block *s,
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
				    struct reiserfs_journal_list *jl)
{
	unsigned long len = 0;
	unsigned long cur_len;
	int ret;
	int i;
	int limit = 256;
	struct reiserfs_journal_list *tjl;
	struct reiserfs_journal_list *flush_jl;
	unsigned long trans_id;
	struct reiserfs_journal *journal = SB_JOURNAL(s);

	flush_jl = tjl = jl;

	/* in data logging mode, try harder to flush a lot of blocks */
	if (reiserfs_data_log(s))
		limit = 1024;
	/* flush for 256 transactions or limit blocks, whichever comes first */
	for (i = 0; i < 256 && len < limit; i++) {
		if (atomic_read(&tjl->j_commit_left) ||
		    tjl->j_trans_id < jl->j_trans_id) {
			break;
		}
		cur_len = atomic_read(&tjl->j_nonzerolen);
		if (cur_len > 0) {
			tjl->j_state &= ~LIST_TOUCHED;
		}
		len += cur_len;
		flush_jl = tjl;
		if (tjl->j_list.next == &journal->j_journal_list)
			break;
		tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
	}
	/* try to find a group of blocks we can flush across all the
	 ** transactions, but only bother if we've actually spanned
	 ** across multiple lists
	 */
	if (flush_jl != jl) {
		ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
	}
	flush_journal_list(s, flush_jl, 1);
	return 0;
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}

/*
** removes any nodes in table with name block and dev as bh.
** only touchs the hnext and hprev pointers.
*/
void remove_journal_hash(struct super_block *sb,
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
			 struct reiserfs_journal_cnode **table,
			 struct reiserfs_journal_list *jl,
			 unsigned long block, int remove_freed)
{
	struct reiserfs_journal_cnode *cur;
	struct reiserfs_journal_cnode **head;

	head = &(journal_hash(table, sb, block));
	if (!head) {
		return;
	}
	cur = *head;
	while (cur) {
		if (cur->blocknr == block && cur->sb == sb
		    && (jl == NULL || jl == cur->jlist)
		    && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
			if (cur->hnext) {
				cur->hnext->hprev = cur->hprev;
			}
			if (cur->hprev) {
				cur->hprev->hnext = cur->hnext;
			} else {
				*head = cur->hnext;
			}
			cur->blocknr = 0;
			cur->sb = NULL;
			cur->state = 0;
			if (cur->bh && cur->jlist)	/* anybody who clears the cur->bh will also dec the nonzerolen */
				atomic_dec(&(cur->jlist->j_nonzerolen));
			cur->bh = NULL;
			cur->jlist = NULL;
		}
		cur = cur->hnext;
	}
}

static void free_journal_ram(struct super_block *p_s_sb)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	reiserfs_kfree(journal->j_current_jl,
		       sizeof(struct reiserfs_journal_list), p_s_sb);
	journal->j_num_lists--;

	vfree(journal->j_cnode_free_orig);
	free_list_bitmaps(p_s_sb, journal->j_list_bitmap);
	free_bitmap_nodes(p_s_sb);	/* must be after free_list_bitmaps */
	if (journal->j_header_bh) {
		brelse(journal->j_header_bh);
	}
	/* j_header_bh is on the journal dev, make sure not to release the journal
	 * dev until we brelse j_header_bh
	 */
	release_journal_dev(p_s_sb, journal);
	vfree(journal);
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}

/*
** call on unmount.  Only set error to 1 if you haven't made your way out
** of read_super() yet.  Any other caller must keep error at 0.
*/
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
static int do_journal_release(struct reiserfs_transaction_handle *th,
			      struct super_block *p_s_sb, int error)
{
	struct reiserfs_transaction_handle myth;
	int flushed = 0;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);

	/* we only want to flush out transactions if we were called with error == 0
	 */
	if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
		/* end the current trans */
		BUG_ON(!th->t_trans_id);
		do_journal_end(th, p_s_sb, 10, FLUSH_ALL);

		/* make sure something gets logged to force our way into the flush code */
		if (!journal_join(&myth, p_s_sb, 1)) {
			reiserfs_prepare_for_journal(p_s_sb,
						     SB_BUFFER_WITH_SB(p_s_sb),
						     1);
			journal_mark_dirty(&myth, p_s_sb,
					   SB_BUFFER_WITH_SB(p_s_sb));
			do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
			flushed = 1;
		}
	}

	/* this also catches errors during the do_journal_end above */
	if (!error && reiserfs_is_journal_aborted(journal)) {
		memset(&myth, 0, sizeof(myth));
		if (!journal_join_abort(&myth, p_s_sb, 1)) {
			reiserfs_prepare_for_journal(p_s_sb,
						     SB_BUFFER_WITH_SB(p_s_sb),
						     1);
			journal_mark_dirty(&myth, p_s_sb,
					   SB_BUFFER_WITH_SB(p_s_sb));
			do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
		}
	}

	reiserfs_mounted_fs_count--;
	/* wait for all commits to finish */
	cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
	flush_workqueue(commit_wq);
	if (!reiserfs_mounted_fs_count) {
		destroy_workqueue(commit_wq);
		commit_wq = NULL;
	}

	free_journal_ram(p_s_sb);

	return 0;
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}

/*
** call on unmount.  flush all journal trans, release all alloc'd ram
*/
1888 1889 1890 1891
int journal_release(struct reiserfs_transaction_handle *th,
		    struct super_block *p_s_sb)
{
	return do_journal_release(th, p_s_sb, 0);
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}
1893

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/*
** only call from an error condition inside reiserfs_read_super!
*/
1897 1898 1899 1900
int journal_release_error(struct reiserfs_transaction_handle *th,
			  struct super_block *p_s_sb)
{
	return do_journal_release(th, p_s_sb, 1);
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}

/* compares description block with commit block.  returns 1 if they differ, 0 if they are the same */
1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914
static int journal_compare_desc_commit(struct super_block *p_s_sb,
				       struct reiserfs_journal_desc *desc,
				       struct reiserfs_journal_commit *commit)
{
	if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
	    get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
	    get_commit_trans_len(commit) > SB_JOURNAL(p_s_sb)->j_trans_max ||
	    get_commit_trans_len(commit) <= 0) {
		return 1;
	}
	return 0;
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}
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/* returns 0 if it did not find a description block  
** returns -1 if it found a corrupt commit block
** returns 1 if both desc and commit were valid 
*/
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
static int journal_transaction_is_valid(struct super_block *p_s_sb,
					struct buffer_head *d_bh,
					unsigned long *oldest_invalid_trans_id,
					unsigned long *newest_mount_id)
{
	struct reiserfs_journal_desc *desc;
	struct reiserfs_journal_commit *commit;
	struct buffer_head *c_bh;
	unsigned long offset;

	if (!d_bh)
		return 0;

	desc = (struct reiserfs_journal_desc *)d_bh->b_data;
	if (get_desc_trans_len(desc) > 0
	    && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
		if (oldest_invalid_trans_id && *oldest_invalid_trans_id
		    && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
			reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
				       "journal-986: transaction "
				       "is valid returning because trans_id %d is greater than "
				       "oldest_invalid %lu",
				       get_desc_trans_id(desc),
				       *oldest_invalid_trans_id);
			return 0;
		}
		if (newest_mount_id
		    && *newest_mount_id > get_desc_mount_id(desc)) {
			reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
				       "journal-1087: transaction "
				       "is valid returning because mount_id %d is less than "
				       "newest_mount_id %lu",
				       get_desc_mount_id(desc),
				       *newest_mount_id);
			return -1;
		}
		if (get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max) {
			reiserfs_warning(p_s_sb,
					 "journal-2018: Bad transaction length %d encountered, ignoring transaction",
					 get_desc_trans_len(desc));
			return -1;
		}
		offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);

		/* ok, we have a journal description block, lets see if the transaction was valid */
		c_bh =
		    journal_bread(p_s_sb,
				  SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
				  ((offset + get_desc_trans_len(desc) +
				    1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
		if (!c_bh)
			return 0;
		commit = (struct reiserfs_journal_commit *)c_bh->b_data;
		if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
			reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
				       "journal_transaction_is_valid, commit offset %ld had bad "
				       "time %d or length %d",
				       c_bh->b_blocknr -
				       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
				       get_commit_trans_id(commit),
				       get_commit_trans_len(commit));
			brelse(c_bh);
			if (oldest_invalid_trans_id) {
				*oldest_invalid_trans_id =
				    get_desc_trans_id(desc);
				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
					       "journal-1004: "
					       "transaction_is_valid setting oldest invalid trans_id "
					       "to %d",
					       get_desc_trans_id(desc));
			}
			return -1;
		}
		brelse(c_bh);
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
			       "journal-1006: found valid "
			       "transaction start offset %llu, len %d id %d",
			       d_bh->b_blocknr -
			       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
			       get_desc_trans_len(desc),
			       get_desc_trans_id(desc));
		return 1;
	} else {
		return 0;
	}
}

static void brelse_array(struct buffer_head **heads, int num)
{
	int i;
	for (i = 0; i < num; i++) {
		brelse(heads[i]);
	}
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}

/*
** given the start, and values for the oldest acceptable transactions,
** this either reads in a replays a transaction, or returns because the transaction
** is invalid, or too old.
*/
2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174
static int journal_read_transaction(struct super_block *p_s_sb,
				    unsigned long cur_dblock,
				    unsigned long oldest_start,
				    unsigned long oldest_trans_id,
				    unsigned long newest_mount_id)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_desc *desc;
	struct reiserfs_journal_commit *commit;
	unsigned long trans_id = 0;
	struct buffer_head *c_bh;
	struct buffer_head *d_bh;
	struct buffer_head **log_blocks = NULL;
	struct buffer_head **real_blocks = NULL;
	unsigned long trans_offset;
	int i;
	int trans_half;

	d_bh = journal_bread(p_s_sb, cur_dblock);
	if (!d_bh)
		return 1;
	desc = (struct reiserfs_journal_desc *)d_bh->b_data;
	trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
	reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
		       "journal_read_transaction, offset %llu, len %d mount_id %d",
		       d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
		       get_desc_trans_len(desc), get_desc_mount_id(desc));
	if (get_desc_trans_id(desc) < oldest_trans_id) {
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
			       "journal_read_trans skipping because %lu is too old",
			       cur_dblock -
			       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
		brelse(d_bh);
		return 1;
	}
	if (get_desc_mount_id(desc) != newest_mount_id) {
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
			       "journal_read_trans skipping because %d is != "
			       "newest_mount_id %lu", get_desc_mount_id(desc),
			       newest_mount_id);
		brelse(d_bh);
		return 1;
	}
	c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
			     ((trans_offset + get_desc_trans_len(desc) + 1) %
			      SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
	if (!c_bh) {
		brelse(d_bh);
		return 1;
	}
	commit = (struct reiserfs_journal_commit *)c_bh->b_data;
	if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
			       "journal_read_transaction, "
			       "commit offset %llu had bad time %d or length %d",
			       c_bh->b_blocknr -
			       SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
			       get_commit_trans_id(commit),
			       get_commit_trans_len(commit));
		brelse(c_bh);
		brelse(d_bh);
		return 1;
	}
	trans_id = get_desc_trans_id(desc);
	/* now we know we've got a good transaction, and it was inside the valid time ranges */
	log_blocks =
	    reiserfs_kmalloc(get_desc_trans_len(desc) *
			     sizeof(struct buffer_head *), GFP_NOFS, p_s_sb);
	real_blocks =
	    reiserfs_kmalloc(get_desc_trans_len(desc) *
			     sizeof(struct buffer_head *), GFP_NOFS, p_s_sb);
	if (!log_blocks || !real_blocks) {
		brelse(c_bh);
		brelse(d_bh);
		reiserfs_kfree(log_blocks,
			       get_desc_trans_len(desc) *
			       sizeof(struct buffer_head *), p_s_sb);
		reiserfs_kfree(real_blocks,
			       get_desc_trans_len(desc) *
			       sizeof(struct buffer_head *), p_s_sb);
		reiserfs_warning(p_s_sb,
				 "journal-1169: kmalloc failed, unable to mount FS");
		return -1;
	}
	/* get all the buffer heads */
	trans_half = journal_trans_half(p_s_sb->s_blocksize);
	for (i = 0; i < get_desc_trans_len(desc); i++) {
		log_blocks[i] =
		    journal_getblk(p_s_sb,
				   SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
				   (trans_offset + 1 +
				    i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
		if (i < trans_half) {
			real_blocks[i] =
			    sb_getblk(p_s_sb,
				      le32_to_cpu(desc->j_realblock[i]));
		} else {
			real_blocks[i] =
			    sb_getblk(p_s_sb,
				      le32_to_cpu(commit->
						  j_realblock[i - trans_half]));
		}
		if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb)) {
			reiserfs_warning(p_s_sb,
					 "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
			goto abort_replay;
		}
		/* make sure we don't try to replay onto log or reserved area */
		if (is_block_in_log_or_reserved_area
		    (p_s_sb, real_blocks[i]->b_blocknr)) {
			reiserfs_warning(p_s_sb,
					 "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block");
		      abort_replay:
			brelse_array(log_blocks, i);
			brelse_array(real_blocks, i);
			brelse(c_bh);
			brelse(d_bh);
			reiserfs_kfree(log_blocks,
				       get_desc_trans_len(desc) *
				       sizeof(struct buffer_head *), p_s_sb);
			reiserfs_kfree(real_blocks,
				       get_desc_trans_len(desc) *
				       sizeof(struct buffer_head *), p_s_sb);
			return -1;
		}
	}
	/* read in the log blocks, memcpy to the corresponding real block */
	ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
	for (i = 0; i < get_desc_trans_len(desc); i++) {
		wait_on_buffer(log_blocks[i]);
		if (!buffer_uptodate(log_blocks[i])) {
			reiserfs_warning(p_s_sb,
					 "journal-1212: REPLAY FAILURE fsck required! buffer write failed");
			brelse_array(log_blocks + i,
				     get_desc_trans_len(desc) - i);
			brelse_array(real_blocks, get_desc_trans_len(desc));
			brelse(c_bh);
			brelse(d_bh);
			reiserfs_kfree(log_blocks,
				       get_desc_trans_len(desc) *
				       sizeof(struct buffer_head *), p_s_sb);
			reiserfs_kfree(real_blocks,
				       get_desc_trans_len(desc) *
				       sizeof(struct buffer_head *), p_s_sb);
			return -1;
		}
		memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
		       real_blocks[i]->b_size);
		set_buffer_uptodate(real_blocks[i]);
		brelse(log_blocks[i]);
	}
	/* flush out the real blocks */
	for (i = 0; i < get_desc_trans_len(desc); i++) {
		set_buffer_dirty(real_blocks[i]);
2175
		ll_rw_block(SWRITE, 1, real_blocks + i);
2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216
	}
	for (i = 0; i < get_desc_trans_len(desc); i++) {
		wait_on_buffer(real_blocks[i]);
		if (!buffer_uptodate(real_blocks[i])) {
			reiserfs_warning(p_s_sb,
					 "journal-1226: REPLAY FAILURE, fsck required! buffer write failed");
			brelse_array(real_blocks + i,
				     get_desc_trans_len(desc) - i);
			brelse(c_bh);
			brelse(d_bh);
			reiserfs_kfree(log_blocks,
				       get_desc_trans_len(desc) *
				       sizeof(struct buffer_head *), p_s_sb);
			reiserfs_kfree(real_blocks,
				       get_desc_trans_len(desc) *
				       sizeof(struct buffer_head *), p_s_sb);
			return -1;
		}
		brelse(real_blocks[i]);
	}
	cur_dblock =
	    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
	    ((trans_offset + get_desc_trans_len(desc) +
	      2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
	reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
		       "journal-1095: setting journal " "start to offset %ld",
		       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));

	/* init starting values for the first transaction, in case this is the last transaction to be replayed. */
	journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
	journal->j_last_flush_trans_id = trans_id;
	journal->j_trans_id = trans_id + 1;
	brelse(c_bh);
	brelse(d_bh);
	reiserfs_kfree(log_blocks,
		       le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *),
		       p_s_sb);
	reiserfs_kfree(real_blocks,
		       le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *),
		       p_s_sb);
	return 0;
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}

/* This function reads blocks starting from block and to max_block of bufsize
   size (but no more than BUFNR blocks at a time). This proved to improve
   mounting speed on self-rebuilding raid5 arrays at least.
   Right now it is only used from journal code. But later we might use it
   from other places.
   Note: Do not use journal_getblk/sb_getblk functions here! */
2225 2226
static struct buffer_head *reiserfs_breada(struct block_device *dev, int block,
					   int bufsize, unsigned int max_block)
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{
2228
	struct buffer_head *bhlist[BUFNR];
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	unsigned int blocks = BUFNR;
2230
	struct buffer_head *bh;
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	int i, j;
2232 2233 2234 2235 2236

	bh = __getblk(dev, block, bufsize);
	if (buffer_uptodate(bh))
		return (bh);

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	if (block + BUFNR > max_block) {
		blocks = max_block - block;
	}
	bhlist[0] = bh;
	j = 1;
	for (i = 1; i < blocks; i++) {
2243 2244 2245
		bh = __getblk(dev, block + i, bufsize);
		if (buffer_uptodate(bh)) {
			brelse(bh);
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			break;
2247 2248
		} else
			bhlist[j++] = bh;
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	}
2250 2251 2252
	ll_rw_block(READ, j, bhlist);
	for (i = 1; i < j; i++)
		brelse(bhlist[i]);
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	bh = bhlist[0];
2254 2255
	wait_on_buffer(bh);
	if (buffer_uptodate(bh))
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		return bh;
2257
	brelse(bh);
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	return NULL;
}

/*
** read and replay the log
** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
** transaction.  This tests that before finding all the transactions in the log, which makes normal mount times fast.
**
** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
**
** On exit, it sets things up so the first transaction will work correctly.
*/
2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441
static int journal_read(struct super_block *p_s_sb)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_desc *desc;
	unsigned long oldest_trans_id = 0;
	unsigned long oldest_invalid_trans_id = 0;
	time_t start;
	unsigned long oldest_start = 0;
	unsigned long cur_dblock = 0;
	unsigned long newest_mount_id = 9;
	struct buffer_head *d_bh;
	struct reiserfs_journal_header *jh;
	int valid_journal_header = 0;
	int replay_count = 0;
	int continue_replay = 1;
	int ret;
	char b[BDEVNAME_SIZE];

	cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
	reiserfs_info(p_s_sb, "checking transaction log (%s)\n",
		      bdevname(journal->j_dev_bd, b));
	start = get_seconds();

	/* step 1, read in the journal header block.  Check the transaction it says 
	 ** is the first unflushed, and if that transaction is not valid, 
	 ** replay is done
	 */
	journal->j_header_bh = journal_bread(p_s_sb,
					     SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)
					     + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
	if (!journal->j_header_bh) {
		return 1;
	}
	jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
	if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 &&
	    le32_to_cpu(jh->j_first_unflushed_offset) <
	    SB_ONDISK_JOURNAL_SIZE(p_s_sb)
	    && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
		oldest_start =
		    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
		    le32_to_cpu(jh->j_first_unflushed_offset);
		oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
		newest_mount_id = le32_to_cpu(jh->j_mount_id);
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
			       "journal-1153: found in "
			       "header: first_unflushed_offset %d, last_flushed_trans_id "
			       "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
			       le32_to_cpu(jh->j_last_flush_trans_id));
		valid_journal_header = 1;

		/* now, we try to read the first unflushed offset.  If it is not valid, 
		 ** there is nothing more we can do, and it makes no sense to read 
		 ** through the whole log.
		 */
		d_bh =
		    journal_bread(p_s_sb,
				  SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
				  le32_to_cpu(jh->j_first_unflushed_offset));
		ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL);
		if (!ret) {
			continue_replay = 0;
		}
		brelse(d_bh);
		goto start_log_replay;
	}

	if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
		reiserfs_warning(p_s_sb,
				 "clm-2076: device is readonly, unable to replay log");
		return -1;
	}

	/* ok, there are transactions that need to be replayed.  start with the first log block, find
	 ** all the valid transactions, and pick out the oldest.
	 */
	while (continue_replay
	       && cur_dblock <
	       (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
		SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
		/* Note that it is required for blocksize of primary fs device and journal
		   device to be the same */
		d_bh =
		    reiserfs_breada(journal->j_dev_bd, cur_dblock,
				    p_s_sb->s_blocksize,
				    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
				    SB_ONDISK_JOURNAL_SIZE(p_s_sb));
		ret =
		    journal_transaction_is_valid(p_s_sb, d_bh,
						 &oldest_invalid_trans_id,
						 &newest_mount_id);
		if (ret == 1) {
			desc = (struct reiserfs_journal_desc *)d_bh->b_data;
			if (oldest_start == 0) {	/* init all oldest_ values */
				oldest_trans_id = get_desc_trans_id(desc);
				oldest_start = d_bh->b_blocknr;
				newest_mount_id = get_desc_mount_id(desc);
				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
					       "journal-1179: Setting "
					       "oldest_start to offset %llu, trans_id %lu",
					       oldest_start -
					       SB_ONDISK_JOURNAL_1st_BLOCK
					       (p_s_sb), oldest_trans_id);
			} else if (oldest_trans_id > get_desc_trans_id(desc)) {
				/* one we just read was older */
				oldest_trans_id = get_desc_trans_id(desc);
				oldest_start = d_bh->b_blocknr;
				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
					       "journal-1180: Resetting "
					       "oldest_start to offset %lu, trans_id %lu",
					       oldest_start -
					       SB_ONDISK_JOURNAL_1st_BLOCK
					       (p_s_sb), oldest_trans_id);
			}
			if (newest_mount_id < get_desc_mount_id(desc)) {
				newest_mount_id = get_desc_mount_id(desc);
				reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
					       "journal-1299: Setting "
					       "newest_mount_id to %d",
					       get_desc_mount_id(desc));
			}
			cur_dblock += get_desc_trans_len(desc) + 2;
		} else {
			cur_dblock++;
		}
		brelse(d_bh);
	}

      start_log_replay:
	cur_dblock = oldest_start;
	if (oldest_trans_id) {
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
			       "journal-1206: Starting replay "
			       "from offset %llu, trans_id %lu",
			       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
			       oldest_trans_id);

	}
	replay_count = 0;
	while (continue_replay && oldest_trans_id > 0) {
		ret =
		    journal_read_transaction(p_s_sb, cur_dblock, oldest_start,
					     oldest_trans_id, newest_mount_id);
		if (ret < 0) {
			return ret;
		} else if (ret != 0) {
			break;
		}
		cur_dblock =
		    SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start;
		replay_count++;
		if (cur_dblock == oldest_start)
			break;
	}

	if (oldest_trans_id == 0) {
		reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
			       "journal-1225: No valid " "transactions found");
	}
	/* j_start does not get set correctly if we don't replay any transactions.
	 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
	 ** copy the trans_id from the header
	 */
	if (valid_journal_header && replay_count == 0) {
		journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
		journal->j_trans_id =
		    le32_to_cpu(jh->j_last_flush_trans_id) + 1;
		journal->j_last_flush_trans_id =
		    le32_to_cpu(jh->j_last_flush_trans_id);
		journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
	} else {
		journal->j_mount_id = newest_mount_id + 1;
	}
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	reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458
		       "newest_mount_id to %lu", journal->j_mount_id);
	journal->j_first_unflushed_offset = journal->j_start;
	if (replay_count > 0) {
		reiserfs_info(p_s_sb,
			      "replayed %d transactions in %lu seconds\n",
			      replay_count, get_seconds() - start);
	}
	if (!bdev_read_only(p_s_sb->s_bdev) &&
	    _update_journal_header_block(p_s_sb, journal->j_start,
					 journal->j_last_flush_trans_id)) {
		/* replay failed, caller must call free_journal_ram and abort
		 ** the mount
		 */
		return -1;
	}
	return 0;
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}

static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
{
2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513
	struct reiserfs_journal_list *jl;
      retry:
	jl = reiserfs_kmalloc(sizeof(struct reiserfs_journal_list), GFP_NOFS,
			      s);
	if (!jl) {
		yield();
		goto retry;
	}
	memset(jl, 0, sizeof(*jl));
	INIT_LIST_HEAD(&jl->j_list);
	INIT_LIST_HEAD(&jl->j_working_list);
	INIT_LIST_HEAD(&jl->j_tail_bh_list);
	INIT_LIST_HEAD(&jl->j_bh_list);
	sema_init(&jl->j_commit_lock, 1);
	SB_JOURNAL(s)->j_num_lists++;
	get_journal_list(jl);
	return jl;
}

static void journal_list_init(struct super_block *p_s_sb)
{
	SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
}

static int release_journal_dev(struct super_block *super,
			       struct reiserfs_journal *journal)
{
	int result;

	result = 0;

	if (journal->j_dev_file != NULL) {
		result = filp_close(journal->j_dev_file, NULL);
		journal->j_dev_file = NULL;
		journal->j_dev_bd = NULL;
	} else if (journal->j_dev_bd != NULL) {
		result = blkdev_put(journal->j_dev_bd);
		journal->j_dev_bd = NULL;
	}

	if (result != 0) {
		reiserfs_warning(super,
				 "sh-457: release_journal_dev: Cannot release journal device: %i",
				 result);
	}
	return result;
}

static int journal_init_dev(struct super_block *super,
			    struct reiserfs_journal *journal,
			    const char *jdev_name)
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{
	int result;
	dev_t jdev;
	int blkdev_mode = FMODE_READ | FMODE_WRITE;
	char b[BDEVNAME_SIZE];

	result = 0;

2522 2523 2524 2525
	journal->j_dev_bd = NULL;
	journal->j_dev_file = NULL;
	jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
	    new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
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	if (bdev_read_only(super->s_bdev))
2528
		blkdev_mode = FMODE_READ;
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	/* there is no "jdev" option and journal is on separate device */
2531
	if ((!jdev_name || !jdev_name[0])) {
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2532 2533 2534 2535
		journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
		if (IS_ERR(journal->j_dev_bd)) {
			result = PTR_ERR(journal->j_dev_bd);
			journal->j_dev_bd = NULL;
2536 2537 2538
			reiserfs_warning(super, "sh-458: journal_init_dev: "
					 "cannot init journal device '%s': %i",
					 __bdevname(jdev, b), result);
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2539 2540 2541 2542 2543 2544
			return result;
		} else if (jdev != super->s_dev)
			set_blocksize(journal->j_dev_bd, super->s_blocksize);
		return 0;
	}

2545 2546
	journal->j_dev_file = filp_open(jdev_name, 0, 0);
	if (!IS_ERR(journal->j_dev_file)) {
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2547
		struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
2548
		if (!S_ISBLK(jdev_inode->i_mode)) {
2549
			reiserfs_warning(super, "journal_init_dev: '%s' is "
2550
					 "not a block device", jdev_name);
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			result = -ENOTBLK;
2552 2553
			release_journal_dev(super, journal);
		} else {
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2554 2555 2556
			/* ok */
			journal->j_dev_bd = I_BDEV(jdev_inode);
			set_blocksize(journal->j_dev_bd, super->s_blocksize);
2557 2558
			reiserfs_info(super,
				      "journal_init_dev: journal device: %s\n",
2559
				      bdevname(journal->j_dev_bd, b));
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2560 2561
		}
	} else {
2562 2563 2564 2565 2566
		result = PTR_ERR(journal->j_dev_file);
		journal->j_dev_file = NULL;
		reiserfs_warning(super,
				 "journal_init_dev: Cannot open '%s': %i",
				 jdev_name, result);
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	}
	return result;
}

/*
** must be called once on fs mount.  calls journal_read for you
*/
2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781
int journal_init(struct super_block *p_s_sb, const char *j_dev_name,
		 int old_format, unsigned int commit_max_age)
{
	int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2;
	struct buffer_head *bhjh;
	struct reiserfs_super_block *rs;
	struct reiserfs_journal_header *jh;
	struct reiserfs_journal *journal;
	struct reiserfs_journal_list *jl;
	char b[BDEVNAME_SIZE];

	journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof(struct reiserfs_journal));
	if (!journal) {
		reiserfs_warning(p_s_sb,
				 "journal-1256: unable to get memory for journal structure");
		return 1;
	}
	memset(journal, 0, sizeof(struct reiserfs_journal));
	INIT_LIST_HEAD(&journal->j_bitmap_nodes);
	INIT_LIST_HEAD(&journal->j_prealloc_list);
	INIT_LIST_HEAD(&journal->j_working_list);
	INIT_LIST_HEAD(&journal->j_journal_list);
	journal->j_persistent_trans = 0;
	if (reiserfs_allocate_list_bitmaps(p_s_sb,
					   journal->j_list_bitmap,
					   SB_BMAP_NR(p_s_sb)))
		goto free_and_return;
	allocate_bitmap_nodes(p_s_sb);

	/* reserved for journal area support */
	SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
						 REISERFS_OLD_DISK_OFFSET_IN_BYTES
						 / p_s_sb->s_blocksize +
						 SB_BMAP_NR(p_s_sb) +
						 1 :
						 REISERFS_DISK_OFFSET_IN_BYTES /
						 p_s_sb->s_blocksize + 2);

	/* Sanity check to see is the standard journal fitting withing first bitmap
	   (actual for small blocksizes) */
	if (!SB_ONDISK_JOURNAL_DEVICE(p_s_sb) &&
	    (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) +
	     SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8)) {
		reiserfs_warning(p_s_sb,
				 "journal-1393: journal does not fit for area "
				 "addressed by first of bitmap blocks. It starts at "
				 "%u and its size is %u. Block size %ld",
				 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb),
				 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
				 p_s_sb->s_blocksize);
		goto free_and_return;
	}

	if (journal_init_dev(p_s_sb, journal, j_dev_name) != 0) {
		reiserfs_warning(p_s_sb,
				 "sh-462: unable to initialize jornal device");
		goto free_and_return;
	}

	rs = SB_DISK_SUPER_BLOCK(p_s_sb);

	/* read journal header */
	bhjh = journal_bread(p_s_sb,
			     SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
			     SB_ONDISK_JOURNAL_SIZE(p_s_sb));
	if (!bhjh) {
		reiserfs_warning(p_s_sb,
				 "sh-459: unable to read journal header");
		goto free_and_return;
	}
	jh = (struct reiserfs_journal_header *)(bhjh->b_data);

	/* make sure that journal matches to the super block */
	if (is_reiserfs_jr(rs)
	    && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
		sb_jp_journal_magic(rs))) {
		reiserfs_warning(p_s_sb,
				 "sh-460: journal header magic %x "
				 "(device %s) does not match to magic found in super "
				 "block %x", jh->jh_journal.jp_journal_magic,
				 bdevname(journal->j_dev_bd, b),
				 sb_jp_journal_magic(rs));
		brelse(bhjh);
		goto free_and_return;
	}

	journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
	journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
	journal->j_max_commit_age =
	    le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
	journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;

	if (journal->j_trans_max) {
		/* make sure these parameters are available, assign it if they are not */
		__u32 initial = journal->j_trans_max;
		__u32 ratio = 1;

		if (p_s_sb->s_blocksize < 4096)
			ratio = 4096 / p_s_sb->s_blocksize;

		if (SB_ONDISK_JOURNAL_SIZE(p_s_sb) / journal->j_trans_max <
		    JOURNAL_MIN_RATIO)
			journal->j_trans_max =
			    SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO;
		if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio)
			journal->j_trans_max =
			    JOURNAL_TRANS_MAX_DEFAULT / ratio;
		if (journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio)
			journal->j_trans_max =
			    JOURNAL_TRANS_MIN_DEFAULT / ratio;

		if (journal->j_trans_max != initial)
			reiserfs_warning(p_s_sb,
					 "sh-461: journal_init: wrong transaction max size (%u). Changed to %u",
					 initial, journal->j_trans_max);

		journal->j_max_batch = journal->j_trans_max *
		    JOURNAL_MAX_BATCH_DEFAULT / JOURNAL_TRANS_MAX_DEFAULT;
	}

	if (!journal->j_trans_max) {
		/*we have the file system was created by old version of mkreiserfs 
		   so this field contains zero value */
		journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
		journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
		journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;

		/* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096
		   trans max size is decreased proportionally */
		if (p_s_sb->s_blocksize < 4096) {
			journal->j_trans_max /= (4096 / p_s_sb->s_blocksize);
			journal->j_max_batch = (journal->j_trans_max) * 9 / 10;
		}
	}

	journal->j_default_max_commit_age = journal->j_max_commit_age;

	if (commit_max_age != 0) {
		journal->j_max_commit_age = commit_max_age;
		journal->j_max_trans_age = commit_max_age;
	}

	reiserfs_info(p_s_sb, "journal params: device %s, size %u, "
		      "journal first block %u, max trans len %u, max batch %u, "
		      "max commit age %u, max trans age %u\n",
		      bdevname(journal->j_dev_bd, b),
		      SB_ONDISK_JOURNAL_SIZE(p_s_sb),
		      SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
		      journal->j_trans_max,
		      journal->j_max_batch,
		      journal->j_max_commit_age, journal->j_max_trans_age);

	brelse(bhjh);

	journal->j_list_bitmap_index = 0;
	journal_list_init(p_s_sb);

	memset(journal->j_list_hash_table, 0,
	       JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));

	INIT_LIST_HEAD(&journal->j_dirty_buffers);
	spin_lock_init(&journal->j_dirty_buffers_lock);

	journal->j_start = 0;
	journal->j_len = 0;
	journal->j_len_alloc = 0;
	atomic_set(&(journal->j_wcount), 0);
	atomic_set(&(journal->j_async_throttle), 0);
	journal->j_bcount = 0;
	journal->j_trans_start_time = 0;
	journal->j_last = NULL;
	journal->j_first = NULL;
	init_waitqueue_head(&(journal->j_join_wait));
	sema_init(&journal->j_lock, 1);
	sema_init(&journal->j_flush_sem, 1);

	journal->j_trans_id = 10;
	journal->j_mount_id = 10;
	journal->j_state = 0;
	atomic_set(&(journal->j_jlock), 0);
	journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
	journal->j_cnode_free_orig = journal->j_cnode_free_list;
	journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
	journal->j_cnode_used = 0;
	journal->j_must_wait = 0;

	init_journal_hash(p_s_sb);
	jl = journal->j_current_jl;
	jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
	if (!jl->j_list_bitmap) {
		reiserfs_warning(p_s_sb,
				 "journal-2005, get_list_bitmap failed for journal list 0");
		goto free_and_return;
	}
	if (journal_read(p_s_sb) < 0) {
		reiserfs_warning(p_s_sb, "Replay Failure, unable to mount");
		goto free_and_return;
	}

	reiserfs_mounted_fs_count++;
	if (reiserfs_mounted_fs_count <= 1)
		commit_wq = create_workqueue("reiserfs");

	INIT_WORK(&journal->j_work, flush_async_commits, p_s_sb);
	return 0;
      free_and_return:
	free_journal_ram(p_s_sb);
	return 1;
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}

/*
** test for a polite end of the current transaction.  Used by file_write, and should
** be used by delete to make sure they don't write more than can fit inside a single
** transaction
*/
2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
				   int new_alloc)
{
	struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
	time_t now = get_seconds();
	/* cannot restart while nested */
	BUG_ON(!th->t_trans_id);
	if (th->t_refcount > 1)
		return 0;
	if (journal->j_must_wait > 0 ||
	    (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
	    atomic_read(&(journal->j_jlock)) ||
	    (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
	    journal->j_cnode_free < (journal->j_trans_max * 3)) {
		return 1;
	}
	return 0;
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}

/* this must be called inside a transaction, and requires the 
** kernel_lock to be held
*/
2811 2812 2813 2814 2815 2816 2817
void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
{
	struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
	BUG_ON(!th->t_trans_id);
	journal->j_must_wait = 1;
	set_bit(J_WRITERS_BLOCKED, &journal->j_state);
	return;
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}

/* this must be called without a transaction started, and does not
** require BKL
*/
2823 2824 2825 2826 2827
void reiserfs_allow_writes(struct super_block *s)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
	wake_up(&journal->j_join_wait);
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}

/* this must be called without a transaction started, and does not
** require BKL
*/
2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851
void reiserfs_wait_on_write_block(struct super_block *s)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	wait_event(journal->j_join_wait,
		   !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
}

static void queue_log_writer(struct super_block *s)
{
	wait_queue_t wait;
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	set_bit(J_WRITERS_QUEUED, &journal->j_state);

	/*
	 * we don't want to use wait_event here because
	 * we only want to wait once.
	 */
	init_waitqueue_entry(&wait, current);
	add_wait_queue(&journal->j_join_wait, &wait);
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	set_current_state(TASK_UNINTERRUPTIBLE);
2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870
	if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
		schedule();
	current->state = TASK_RUNNING;
	remove_wait_queue(&journal->j_join_wait, &wait);
}

static void wake_queued_writers(struct super_block *s)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
		wake_up(&journal->j_join_wait);
}

static void let_transaction_grow(struct super_block *sb, unsigned long trans_id)
{
	struct reiserfs_journal *journal = SB_JOURNAL(sb);
	unsigned long bcount = journal->j_bcount;
	while (1) {
2871
		schedule_timeout_uninterruptible(1);
2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882
		journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
		while ((atomic_read(&journal->j_wcount) > 0 ||
			atomic_read(&journal->j_jlock)) &&
		       journal->j_trans_id == trans_id) {
			queue_log_writer(sb);
		}
		if (journal->j_trans_id != trans_id)
			break;
		if (bcount == journal->j_bcount)
			break;
		bcount = journal->j_bcount;
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	}
}

/* join == true if you must join an existing transaction.
** join == false if you can deal with waiting for others to finish
**
** this will block until the transaction is joinable.  send the number of blocks you
** expect to use in nblocks.
*/
2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113
static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
			      struct super_block *p_s_sb, unsigned long nblocks,
			      int join)
{
	time_t now = get_seconds();
	int old_trans_id;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_transaction_handle myth;
	int sched_count = 0;
	int retval;

	reiserfs_check_lock_depth(p_s_sb, "journal_begin");
	if (nblocks > journal->j_trans_max)
		BUG();

	PROC_INFO_INC(p_s_sb, journal.journal_being);
	/* set here for journal_join */
	th->t_refcount = 1;
	th->t_super = p_s_sb;

      relock:
	lock_journal(p_s_sb);
	if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
		unlock_journal(p_s_sb);
		retval = journal->j_errno;
		goto out_fail;
	}
	journal->j_bcount++;

	if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
		unlock_journal(p_s_sb);
		reiserfs_wait_on_write_block(p_s_sb);
		PROC_INFO_INC(p_s_sb, journal.journal_relock_writers);
		goto relock;
	}
	now = get_seconds();

	/* if there is no room in the journal OR
	 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning 
	 ** we don't sleep if there aren't other writers
	 */

	if ((!join && journal->j_must_wait > 0) ||
	    (!join
	     && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
	    || (!join && atomic_read(&journal->j_wcount) > 0
		&& journal->j_trans_start_time > 0
		&& (now - journal->j_trans_start_time) >
		journal->j_max_trans_age) || (!join
					      && atomic_read(&journal->j_jlock))
	    || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {

		old_trans_id = journal->j_trans_id;
		unlock_journal(p_s_sb);	/* allow others to finish this transaction */

		if (!join && (journal->j_len_alloc + nblocks + 2) >=
		    journal->j_max_batch &&
		    ((journal->j_len + nblocks + 2) * 100) <
		    (journal->j_len_alloc * 75)) {
			if (atomic_read(&journal->j_wcount) > 10) {
				sched_count++;
				queue_log_writer(p_s_sb);
				goto relock;
			}
		}
		/* don't mess with joining the transaction if all we have to do is
		 * wait for someone else to do a commit
		 */
		if (atomic_read(&journal->j_jlock)) {
			while (journal->j_trans_id == old_trans_id &&
			       atomic_read(&journal->j_jlock)) {
				queue_log_writer(p_s_sb);
			}
			goto relock;
		}
		retval = journal_join(&myth, p_s_sb, 1);
		if (retval)
			goto out_fail;

		/* someone might have ended the transaction while we joined */
		if (old_trans_id != journal->j_trans_id) {
			retval = do_journal_end(&myth, p_s_sb, 1, 0);
		} else {
			retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW);
		}

		if (retval)
			goto out_fail;

		PROC_INFO_INC(p_s_sb, journal.journal_relock_wcount);
		goto relock;
	}
	/* we are the first writer, set trans_id */
	if (journal->j_trans_start_time == 0) {
		journal->j_trans_start_time = get_seconds();
	}
	atomic_inc(&(journal->j_wcount));
	journal->j_len_alloc += nblocks;
	th->t_blocks_logged = 0;
	th->t_blocks_allocated = nblocks;
	th->t_trans_id = journal->j_trans_id;
	unlock_journal(p_s_sb);
	INIT_LIST_HEAD(&th->t_list);
	get_fs_excl();
	return 0;

      out_fail:
	memset(th, 0, sizeof(*th));
	/* Re-set th->t_super, so we can properly keep track of how many
	 * persistent transactions there are. We need to do this so if this
	 * call is part of a failed restart_transaction, we can free it later */
	th->t_super = p_s_sb;
	return retval;
}

struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
								    super_block
								    *s,
								    int nblocks)
{
	int ret;
	struct reiserfs_transaction_handle *th;

	/* if we're nesting into an existing transaction.  It will be
	 ** persistent on its own
	 */
	if (reiserfs_transaction_running(s)) {
		th = current->journal_info;
		th->t_refcount++;
		if (th->t_refcount < 2) {
			BUG();
		}
		return th;
	}
	th = reiserfs_kmalloc(sizeof(struct reiserfs_transaction_handle),
			      GFP_NOFS, s);
	if (!th)
		return NULL;
	ret = journal_begin(th, s, nblocks);
	if (ret) {
		reiserfs_kfree(th, sizeof(struct reiserfs_transaction_handle),
			       s);
		return NULL;
	}

	SB_JOURNAL(s)->j_persistent_trans++;
	return th;
}

int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
{
	struct super_block *s = th->t_super;
	int ret = 0;
	if (th->t_trans_id)
		ret = journal_end(th, th->t_super, th->t_blocks_allocated);
	else
		ret = -EIO;
	if (th->t_refcount == 0) {
		SB_JOURNAL(s)->j_persistent_trans--;
		reiserfs_kfree(th, sizeof(struct reiserfs_transaction_handle),
			       s);
	}
	return ret;
}

static int journal_join(struct reiserfs_transaction_handle *th,
			struct super_block *p_s_sb, unsigned long nblocks)
{
	struct reiserfs_transaction_handle *cur_th = current->journal_info;

	/* this keeps do_journal_end from NULLing out the current->journal_info
	 ** pointer
	 */
	th->t_handle_save = cur_th;
	if (cur_th && cur_th->t_refcount > 1) {
		BUG();
	}
	return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN);
}

int journal_join_abort(struct reiserfs_transaction_handle *th,
		       struct super_block *p_s_sb, unsigned long nblocks)
{
	struct reiserfs_transaction_handle *cur_th = current->journal_info;

	/* this keeps do_journal_end from NULLing out the current->journal_info
	 ** pointer
	 */
	th->t_handle_save = cur_th;
	if (cur_th && cur_th->t_refcount > 1) {
		BUG();
	}
	return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT);
}

int journal_begin(struct reiserfs_transaction_handle *th,
		  struct super_block *p_s_sb, unsigned long nblocks)
{
	struct reiserfs_transaction_handle *cur_th = current->journal_info;
	int ret;

	th->t_handle_save = NULL;
	if (cur_th) {
		/* we are nesting into the current transaction */
		if (cur_th->t_super == p_s_sb) {
			BUG_ON(!cur_th->t_refcount);
			cur_th->t_refcount++;
			memcpy(th, cur_th, sizeof(*th));
			if (th->t_refcount <= 1)
				reiserfs_warning(p_s_sb,
						 "BAD: refcount <= 1, but journal_info != 0");
			return 0;
		} else {
			/* we've ended up with a handle from a different filesystem.
			 ** save it and restore on journal_end.  This should never
			 ** really happen...
			 */
			reiserfs_warning(p_s_sb,
					 "clm-2100: nesting info a different FS");
			th->t_handle_save = current->journal_info;
			current->journal_info = th;
		}
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Linus Torvalds 已提交
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	} else {
3115 3116 3117 3118 3119
		current->journal_info = th;
	}
	ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG);
	if (current->journal_info != th)
		BUG();
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3121 3122 3123 3124 3125 3126 3127
	/* I guess this boils down to being the reciprocal of clm-2100 above.
	 * If do_journal_begin_r fails, we need to put it back, since journal_end
	 * won't be called to do it. */
	if (ret)
		current->journal_info = th->t_handle_save;
	else
		BUG_ON(!th->t_refcount);
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3129
	return ret;
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}

/*
** puts bh into the current transaction.  If it was already there, reorders removes the
** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
**
** if it was dirty, cleans and files onto the clean list.  I can't let it be dirty again until the
** transaction is committed.
** 
** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
*/
3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
int journal_mark_dirty(struct reiserfs_transaction_handle *th,
		       struct super_block *p_s_sb, struct buffer_head *bh)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_cnode *cn = NULL;
	int count_already_incd = 0;
	int prepared = 0;
	BUG_ON(!th->t_trans_id);

	PROC_INFO_INC(p_s_sb, journal.mark_dirty);
	if (th->t_trans_id != journal->j_trans_id) {
		reiserfs_panic(th->t_super,
			       "journal-1577: handle trans id %ld != current trans id %ld\n",
			       th->t_trans_id, journal->j_trans_id);
	}

	p_s_sb->s_dirt = 1;

	prepared = test_clear_buffer_journal_prepared(bh);
	clear_buffer_journal_restore_dirty(bh);
	/* already in this transaction, we are done */
	if (buffer_journaled(bh)) {
		PROC_INFO_INC(p_s_sb, journal.mark_dirty_already);
		return 0;
	}

	/* this must be turned into a panic instead of a warning.  We can't allow
	 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
	 ** could get to disk too early.  NOT GOOD.
	 */
	if (!prepared || buffer_dirty(bh)) {
		reiserfs_warning(p_s_sb, "journal-1777: buffer %llu bad state "
				 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
				 (unsigned long long)bh->b_blocknr,
				 prepared ? ' ' : '!',
				 buffer_locked(bh) ? ' ' : '!',
				 buffer_dirty(bh) ? ' ' : '!',
				 buffer_journal_dirty(bh) ? ' ' : '!');
	}

	if (atomic_read(&(journal->j_wcount)) <= 0) {
		reiserfs_warning(p_s_sb,
				 "journal-1409: journal_mark_dirty returning because j_wcount was %d",
				 atomic_read(&(journal->j_wcount)));
		return 1;
	}
	/* this error means I've screwed up, and we've overflowed the transaction.  
	 ** Nothing can be done here, except make the FS readonly or panic.
	 */
	if (journal->j_len >= journal->j_trans_max) {
		reiserfs_panic(th->t_super,
			       "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n",
			       journal->j_len);
	}

	if (buffer_journal_dirty(bh)) {
		count_already_incd = 1;
		PROC_INFO_INC(p_s_sb, journal.mark_dirty_notjournal);
		clear_buffer_journal_dirty(bh);
	}

	if (journal->j_len > journal->j_len_alloc) {
		journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
	}

	set_buffer_journaled(bh);

	/* now put this guy on the end */
	if (!cn) {
		cn = get_cnode(p_s_sb);
		if (!cn) {
			reiserfs_panic(p_s_sb, "get_cnode failed!\n");
		}

		if (th->t_blocks_logged == th->t_blocks_allocated) {
			th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
			journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
		}
		th->t_blocks_logged++;
		journal->j_len++;

		cn->bh = bh;
		cn->blocknr = bh->b_blocknr;
		cn->sb = p_s_sb;
		cn->jlist = NULL;
		insert_journal_hash(journal->j_hash_table, cn);
		if (!count_already_incd) {
			get_bh(bh);
		}
	}
	cn->next = NULL;
	cn->prev = journal->j_last;
	cn->bh = bh;
	if (journal->j_last) {
		journal->j_last->next = cn;
		journal->j_last = cn;
	} else {
		journal->j_first = cn;
		journal->j_last = cn;
	}
	return 0;
}

int journal_end(struct reiserfs_transaction_handle *th,
		struct super_block *p_s_sb, unsigned long nblocks)
{
	if (!current->journal_info && th->t_refcount > 1)
		reiserfs_warning(p_s_sb, "REISER-NESTING: th NULL, refcount %d",
				 th->t_refcount);

	if (!th->t_trans_id) {
		WARN_ON(1);
		return -EIO;
	}

	th->t_refcount--;
	if (th->t_refcount > 0) {
		struct reiserfs_transaction_handle *cur_th =
		    current->journal_info;

		/* we aren't allowed to close a nested transaction on a different
		 ** filesystem from the one in the task struct
		 */
		if (cur_th->t_super != th->t_super)
			BUG();

		if (th != cur_th) {
			memcpy(current->journal_info, th, sizeof(*th));
			th->t_trans_id = 0;
		}
		return 0;
	} else {
		return do_journal_end(th, p_s_sb, nblocks, 0);
	}
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}

/* removes from the current transaction, relsing and descrementing any counters.  
** also files the removed buffer directly onto the clean list
**
** called by journal_mark_freed when a block has been deleted
**
** returns 1 if it cleaned and relsed the buffer. 0 otherwise
*/
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static int remove_from_transaction(struct super_block *p_s_sb,
				   b_blocknr_t blocknr, int already_cleaned)
{
	struct buffer_head *bh;
	struct reiserfs_journal_cnode *cn;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	int ret = 0;

	cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
	if (!cn || !cn->bh) {
		return ret;
	}
	bh = cn->bh;
	if (cn->prev) {
		cn->prev->next = cn->next;
	}
	if (cn->next) {
		cn->next->prev = cn->prev;
	}
	if (cn == journal->j_first) {
		journal->j_first = cn->next;
	}
	if (cn == journal->j_last) {
		journal->j_last = cn->prev;
	}
	if (bh)
		remove_journal_hash(p_s_sb, journal->j_hash_table, NULL,
				    bh->b_blocknr, 0);
	clear_buffer_journaled(bh);	/* don't log this one */

	if (!already_cleaned) {
		clear_buffer_journal_dirty(bh);
		clear_buffer_dirty(bh);
		clear_buffer_journal_test(bh);
		put_bh(bh);
		if (atomic_read(&(bh->b_count)) < 0) {
			reiserfs_warning(p_s_sb,
					 "journal-1752: remove from trans, b_count < 0");
		}
		ret = 1;
	}
	journal->j_len--;
	journal->j_len_alloc--;
	free_cnode(p_s_sb, cn);
	return ret;
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}

/*
** for any cnode in a journal list, it can only be dirtied of all the
** transactions that include it are commited to disk.
** this checks through each transaction, and returns 1 if you are allowed to dirty,
** and 0 if you aren't
**
** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
** blocks for a given transaction on disk
**
*/
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371
static int can_dirty(struct reiserfs_journal_cnode *cn)
{
	struct super_block *sb = cn->sb;
	b_blocknr_t blocknr = cn->blocknr;
	struct reiserfs_journal_cnode *cur = cn->hprev;
	int can_dirty = 1;

	/* first test hprev.  These are all newer than cn, so any node here
	 ** with the same block number and dev means this node can't be sent
	 ** to disk right now.
	 */
	while (cur && can_dirty) {
		if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
		    cur->blocknr == blocknr) {
			can_dirty = 0;
		}
		cur = cur->hprev;
	}
	/* then test hnext.  These are all older than cn.  As long as they
	 ** are committed to the log, it is safe to write cn to disk
	 */
	cur = cn->hnext;
	while (cur && can_dirty) {
		if (cur->jlist && cur->jlist->j_len > 0 &&
		    atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
		    cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
			can_dirty = 0;
		}
		cur = cur->hnext;
	}
	return can_dirty;
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}

/* syncs the commit blocks, but does not force the real buffers to disk
** will wait until the current transaction is done/commited before returning 
*/
3377 3378 3379 3380
int journal_end_sync(struct reiserfs_transaction_handle *th,
		     struct super_block *p_s_sb, unsigned long nblocks)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
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	BUG_ON(!th->t_trans_id);
	/* you can sync while nested, very, very bad */
	if (th->t_refcount > 1) {
		BUG();
	}
	if (journal->j_len == 0) {
		reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
					     1);
		journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
	}
	return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT);
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}

/*
** writeback the pending async commits to disk
*/
3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422
static void flush_async_commits(void *p)
{
	struct super_block *p_s_sb = p;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_list *jl;
	struct list_head *entry;

	lock_kernel();
	if (!list_empty(&journal->j_journal_list)) {
		/* last entry is the youngest, commit it and you get everything */
		entry = journal->j_journal_list.prev;
		jl = JOURNAL_LIST_ENTRY(entry);
		flush_commit_list(p_s_sb, jl, 1);
	}
	unlock_kernel();
	/*
	 * this is a little racey, but there's no harm in missing
	 * the filemap_fdata_write
	 */
	if (!atomic_read(&journal->j_async_throttle)
	    && !reiserfs_is_journal_aborted(journal)) {
		atomic_inc(&journal->j_async_throttle);
		filemap_fdatawrite(p_s_sb->s_bdev->bd_inode->i_mapping);
		atomic_dec(&journal->j_async_throttle);
	}
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}

/*
** flushes any old transactions to disk
** ends the current transaction if it is too old
*/
3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463
int reiserfs_flush_old_commits(struct super_block *p_s_sb)
{
	time_t now;
	struct reiserfs_transaction_handle th;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);

	now = get_seconds();
	/* safety check so we don't flush while we are replaying the log during
	 * mount
	 */
	if (list_empty(&journal->j_journal_list)) {
		return 0;
	}

	/* check the current transaction.  If there are no writers, and it is
	 * too old, finish it, and force the commit blocks to disk
	 */
	if (atomic_read(&journal->j_wcount) <= 0 &&
	    journal->j_trans_start_time > 0 &&
	    journal->j_len > 0 &&
	    (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
		if (!journal_join(&th, p_s_sb, 1)) {
			reiserfs_prepare_for_journal(p_s_sb,
						     SB_BUFFER_WITH_SB(p_s_sb),
						     1);
			journal_mark_dirty(&th, p_s_sb,
					   SB_BUFFER_WITH_SB(p_s_sb));

			/* we're only being called from kreiserfsd, it makes no sense to do
			 ** an async commit so that kreiserfsd can do it later
			 */
			do_journal_end(&th, p_s_sb, 1, COMMIT_NOW | WAIT);
		}
	}
	return p_s_sb->s_dirt;
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}

/*
** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
** 
** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all 
** the writers are done.  By the time it wakes up, the transaction it was called has already ended, so it just
** flushes the commit list and returns 0.
**
** Won't batch when flush or commit_now is set.  Also won't batch when others are waiting on j_join_wait.
** 
** Note, we can't allow the journal_end to proceed while there are still writers in the log.
*/
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static int check_journal_end(struct reiserfs_transaction_handle *th,
			     struct super_block *p_s_sb, unsigned long nblocks,
			     int flags)
{

	time_t now;
	int flush = flags & FLUSH_ALL;
	int commit_now = flags & COMMIT_NOW;
	int wait_on_commit = flags & WAIT;
	struct reiserfs_journal_list *jl;
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);

	BUG_ON(!th->t_trans_id);

	if (th->t_trans_id != journal->j_trans_id) {
		reiserfs_panic(th->t_super,
			       "journal-1577: handle trans id %ld != current trans id %ld\n",
			       th->t_trans_id, journal->j_trans_id);
	}

	journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
	if (atomic_read(&(journal->j_wcount)) > 0) {	/* <= 0 is allowed.  unmounting might not call begin */
		atomic_dec(&(journal->j_wcount));
	}

	/* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released 
	 ** will be dealt with by next transaction that actually writes something, but should be taken
	 ** care of in this trans
	 */
	if (journal->j_len == 0) {
		BUG();
	}
	/* if wcount > 0, and we are called to with flush or commit_now,
	 ** we wait on j_join_wait.  We will wake up when the last writer has
	 ** finished the transaction, and started it on its way to the disk.
	 ** Then, we flush the commit or journal list, and just return 0 
	 ** because the rest of journal end was already done for this transaction.
	 */
	if (atomic_read(&(journal->j_wcount)) > 0) {
		if (flush || commit_now) {
			unsigned trans_id;

			jl = journal->j_current_jl;
			trans_id = jl->j_trans_id;
			if (wait_on_commit)
				jl->j_state |= LIST_COMMIT_PENDING;
			atomic_set(&(journal->j_jlock), 1);
			if (flush) {
				journal->j_next_full_flush = 1;
			}
			unlock_journal(p_s_sb);

			/* sleep while the current transaction is still j_jlocked */
			while (journal->j_trans_id == trans_id) {
				if (atomic_read(&journal->j_jlock)) {
					queue_log_writer(p_s_sb);
				} else {
					lock_journal(p_s_sb);
					if (journal->j_trans_id == trans_id) {
						atomic_set(&(journal->j_jlock),
							   1);
					}
					unlock_journal(p_s_sb);
				}
			}
			if (journal->j_trans_id == trans_id) {
				BUG();
			}
			if (commit_now
			    && journal_list_still_alive(p_s_sb, trans_id)
			    && wait_on_commit) {
				flush_commit_list(p_s_sb, jl, 1);
			}
			return 0;
		}
		unlock_journal(p_s_sb);
		return 0;
	}

	/* deal with old transactions where we are the last writers */
	now = get_seconds();
	if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
		commit_now = 1;
		journal->j_next_async_flush = 1;
	}
	/* don't batch when someone is waiting on j_join_wait */
	/* don't batch when syncing the commit or flushing the whole trans */
	if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
	    && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
	    && journal->j_len_alloc < journal->j_max_batch
	    && journal->j_cnode_free > (journal->j_trans_max * 3)) {
		journal->j_bcount++;
		unlock_journal(p_s_sb);
		return 0;
	}

	if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
		reiserfs_panic(p_s_sb,
			       "journal-003: journal_end: j_start (%ld) is too high\n",
			       journal->j_start);
	}
	return 1;
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}

/*
** Does all the work that makes deleting blocks safe.
** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
** 
** otherwise:
** set a bit for the block in the journal bitmap.  That will prevent it from being allocated for unformatted nodes
** before this transaction has finished.
**
** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.  That will prevent any old transactions with
** this block from trying to flush to the real location.  Since we aren't removing the cnode from the journal_list_hash,
** the block can't be reallocated yet.
**
** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
*/
3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683
int journal_mark_freed(struct reiserfs_transaction_handle *th,
		       struct super_block *p_s_sb, b_blocknr_t blocknr)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_cnode *cn = NULL;
	struct buffer_head *bh = NULL;
	struct reiserfs_list_bitmap *jb = NULL;
	int cleaned = 0;
	BUG_ON(!th->t_trans_id);

	cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
	if (cn && cn->bh) {
		bh = cn->bh;
		get_bh(bh);
	}
	/* if it is journal new, we just remove it from this transaction */
	if (bh && buffer_journal_new(bh)) {
		clear_buffer_journal_new(bh);
		clear_prepared_bits(bh);
		reiserfs_clean_and_file_buffer(bh);
		cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
	} else {
		/* set the bit for this block in the journal bitmap for this transaction */
		jb = journal->j_current_jl->j_list_bitmap;
		if (!jb) {
			reiserfs_panic(p_s_sb,
				       "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n");
		}
		set_bit_in_list_bitmap(p_s_sb, blocknr, jb);

		/* Note, the entire while loop is not allowed to schedule.  */

		if (bh) {
			clear_prepared_bits(bh);
			reiserfs_clean_and_file_buffer(bh);
		}
		cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);

		/* find all older transactions with this block, make sure they don't try to write it out */
		cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table,
					  blocknr);
		while (cn) {
			if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
				set_bit(BLOCK_FREED, &cn->state);
				if (cn->bh) {
					if (!cleaned) {
						/* remove_from_transaction will brelse the buffer if it was 
						 ** in the current trans
						 */
						clear_buffer_journal_dirty(cn->
									   bh);
						clear_buffer_dirty(cn->bh);
						clear_buffer_journal_test(cn->
									  bh);
						cleaned = 1;
						put_bh(cn->bh);
						if (atomic_read
						    (&(cn->bh->b_count)) < 0) {
							reiserfs_warning(p_s_sb,
									 "journal-2138: cn->bh->b_count < 0");
						}
					}
					if (cn->jlist) {	/* since we are clearing the bh, we MUST dec nonzerolen */
						atomic_dec(&
							   (cn->jlist->
							    j_nonzerolen));
					}
					cn->bh = NULL;
				}
			}
			cn = cn->hnext;
		}
	}

	if (bh) {
		put_bh(bh);	/* get_hash grabs the buffer */
		if (atomic_read(&(bh->b_count)) < 0) {
			reiserfs_warning(p_s_sb,
					 "journal-2165: bh->b_count < 0");
		}
	}
	return 0;
}

void reiserfs_update_inode_transaction(struct inode *inode)
{
	struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
	REISERFS_I(inode)->i_jl = journal->j_current_jl;
	REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
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}

/*
 * returns -1 on error, 0 if no commits/barriers were done and 1
 * if a transaction was actually committed and the barrier was done
 */
static int __commit_trans_jl(struct inode *inode, unsigned long id,
3691
			     struct reiserfs_journal_list *jl)
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{
3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705
	struct reiserfs_transaction_handle th;
	struct super_block *sb = inode->i_sb;
	struct reiserfs_journal *journal = SB_JOURNAL(sb);
	int ret = 0;

	/* is it from the current transaction, or from an unknown transaction? */
	if (id == journal->j_trans_id) {
		jl = journal->j_current_jl;
		/* try to let other writers come in and grow this transaction */
		let_transaction_grow(sb, id);
		if (journal->j_trans_id != id) {
			goto flush_commit_only;
		}
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3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718
		ret = journal_begin(&th, sb, 1);
		if (ret)
			return ret;

		/* someone might have ended this transaction while we joined */
		if (journal->j_trans_id != id) {
			reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
						     1);
			journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
			ret = journal_end(&th, sb, 1);
			goto flush_commit_only;
		}
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3720 3721 3722
		ret = journal_end_sync(&th, sb, 1);
		if (!ret)
			ret = 1;
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	} else {
		/* this gets tricky, we have to make sure the journal list in
		 * the inode still exists.  We know the list is still around
		 * if we've got a larger transaction id than the oldest list
		 */
	      flush_commit_only:
		if (journal_list_still_alive(inode->i_sb, id)) {
			/*
			 * we only set ret to 1 when we know for sure
			 * the barrier hasn't been started yet on the commit
			 * block.
			 */
			if (atomic_read(&jl->j_commit_left) > 1)
				ret = 1;
			flush_commit_list(sb, jl, 1);
			if (journal->j_errno)
				ret = journal->j_errno;
		}
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	}
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	/* otherwise the list is gone, and long since committed */
	return ret;
}
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int reiserfs_commit_for_inode(struct inode *inode)
{
	unsigned long id = REISERFS_I(inode)->i_trans_id;
	struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
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	/* for the whole inode, assume unset id means it was
	 * changed in the current transaction.  More conservative
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	 */
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	if (!id || !jl) {
		reiserfs_update_inode_transaction(inode);
		id = REISERFS_I(inode)->i_trans_id;
		/* jl will be updated in __commit_trans_jl */
	}

	return __commit_trans_jl(inode, id, jl);
}

void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
				      struct buffer_head *bh)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	PROC_INFO_INC(p_s_sb, journal.restore_prepared);
	if (!bh) {
		return;
	}
	if (test_clear_buffer_journal_restore_dirty(bh) &&
	    buffer_journal_dirty(bh)) {
		struct reiserfs_journal_cnode *cn;
		cn = get_journal_hash_dev(p_s_sb,
					  journal->j_list_hash_table,
					  bh->b_blocknr);
		if (cn && can_dirty(cn)) {
			set_buffer_journal_test(bh);
			mark_buffer_dirty(bh);
		}
	}
	clear_buffer_journal_prepared(bh);
}

extern struct tree_balance *cur_tb;
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/*
** before we can change a metadata block, we have to make sure it won't
** be written to disk while we are altering it.  So, we must:
** clean it
** wait on it.
** 
*/
int reiserfs_prepare_for_journal(struct super_block *p_s_sb,
3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828
				 struct buffer_head *bh, int wait)
{
	PROC_INFO_INC(p_s_sb, journal.prepare);

	if (test_set_buffer_locked(bh)) {
		if (!wait)
			return 0;
		lock_buffer(bh);
	}
	set_buffer_journal_prepared(bh);
	if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
		clear_buffer_journal_test(bh);
		set_buffer_journal_restore_dirty(bh);
	}
	unlock_buffer(bh);
	return 1;
}

static void flush_old_journal_lists(struct super_block *s)
{
	struct reiserfs_journal *journal = SB_JOURNAL(s);
	struct reiserfs_journal_list *jl;
	struct list_head *entry;
	time_t now = get_seconds();

	while (!list_empty(&journal->j_journal_list)) {
		entry = journal->j_journal_list.next;
		jl = JOURNAL_LIST_ENTRY(entry);
		/* this check should always be run, to send old lists to disk */
		if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4))) {
			flush_used_journal_lists(s, jl);
		} else {
			break;
		}
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	}
}

/* 
** long and ugly.  If flush, will not return until all commit
** blocks and all real buffers in the trans are on disk.
** If no_async, won't return until all commit blocks are on disk.
**
** keep reading, there are comments as you go along
**
** If the journal is aborted, we just clean up. Things like flushing
** journal lists, etc just won't happen.
*/
3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874
static int do_journal_end(struct reiserfs_transaction_handle *th,
			  struct super_block *p_s_sb, unsigned long nblocks,
			  int flags)
{
	struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
	struct reiserfs_journal_cnode *cn, *next, *jl_cn;
	struct reiserfs_journal_cnode *last_cn = NULL;
	struct reiserfs_journal_desc *desc;
	struct reiserfs_journal_commit *commit;
	struct buffer_head *c_bh;	/* commit bh */
	struct buffer_head *d_bh;	/* desc bh */
	int cur_write_start = 0;	/* start index of current log write */
	int old_start;
	int i;
	int flush = flags & FLUSH_ALL;
	int wait_on_commit = flags & WAIT;
	struct reiserfs_journal_list *jl, *temp_jl;
	struct list_head *entry, *safe;
	unsigned long jindex;
	unsigned long commit_trans_id;
	int trans_half;

	BUG_ON(th->t_refcount > 1);
	BUG_ON(!th->t_trans_id);

	put_fs_excl();
	current->journal_info = th->t_handle_save;
	reiserfs_check_lock_depth(p_s_sb, "journal end");
	if (journal->j_len == 0) {
		reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
					     1);
		journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
	}
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3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907
	lock_journal(p_s_sb);
	if (journal->j_next_full_flush) {
		flags |= FLUSH_ALL;
		flush = 1;
	}
	if (journal->j_next_async_flush) {
		flags |= COMMIT_NOW | WAIT;
		wait_on_commit = 1;
	}

	/* check_journal_end locks the journal, and unlocks if it does not return 1 
	 ** it tells us if we should continue with the journal_end, or just return
	 */
	if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
		p_s_sb->s_dirt = 1;
		wake_queued_writers(p_s_sb);
		reiserfs_async_progress_wait(p_s_sb);
		goto out;
	}

	/* check_journal_end might set these, check again */
	if (journal->j_next_full_flush) {
		flush = 1;
	}

	/*
	 ** j must wait means we have to flush the log blocks, and the real blocks for
	 ** this transaction
	 */
	if (journal->j_must_wait > 0) {
		flush = 1;
	}
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#ifdef REISERFS_PREALLOCATE
3909 3910 3911 3912 3913
	/* quota ops might need to nest, setup the journal_info pointer for them */
	current->journal_info = th;
	reiserfs_discard_all_prealloc(th);	/* it should not involve new blocks into
						 * the transaction */
	current->journal_info = th->t_handle_save;
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#endif
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	/* setup description block */
	d_bh =
	    journal_getblk(p_s_sb,
			   SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
			   journal->j_start);
	set_buffer_uptodate(d_bh);
	desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
	memset(d_bh->b_data, 0, d_bh->b_size);
	memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
	set_desc_trans_id(desc, journal->j_trans_id);

	/* setup commit block.  Don't write (keep it clean too) this one until after everyone else is written */
	c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
			      ((journal->j_start + journal->j_len +
				1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
	commit = (struct reiserfs_journal_commit *)c_bh->b_data;
	memset(c_bh->b_data, 0, c_bh->b_size);
	set_commit_trans_id(commit, journal->j_trans_id);
	set_buffer_uptodate(c_bh);

	/* init this journal list */
	jl = journal->j_current_jl;

	/* we lock the commit before doing anything because
	 * we want to make sure nobody tries to run flush_commit_list until
	 * the new transaction is fully setup, and we've already flushed the
	 * ordered bh list
	 */
	down(&jl->j_commit_lock);

	/* save the transaction id in case we need to commit it later */
	commit_trans_id = jl->j_trans_id;

	atomic_set(&jl->j_older_commits_done, 0);
	jl->j_trans_id = journal->j_trans_id;
	jl->j_timestamp = journal->j_trans_start_time;
	jl->j_commit_bh = c_bh;
	jl->j_start = journal->j_start;
	jl->j_len = journal->j_len;
	atomic_set(&jl->j_nonzerolen, journal->j_len);
	atomic_set(&jl->j_commit_left, journal->j_len + 2);
	jl->j_realblock = NULL;

	/* The ENTIRE FOR LOOP MUST not cause schedule to occur.
	 **  for each real block, add it to the journal list hash,
	 ** copy into real block index array in the commit or desc block
	 */
	trans_half = journal_trans_half(p_s_sb->s_blocksize);
	for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
		if (buffer_journaled(cn->bh)) {
			jl_cn = get_cnode(p_s_sb);
			if (!jl_cn) {
				reiserfs_panic(p_s_sb,
					       "journal-1676, get_cnode returned NULL\n");
			}
			if (i == 0) {
				jl->j_realblock = jl_cn;
			}
			jl_cn->prev = last_cn;
			jl_cn->next = NULL;
			if (last_cn) {
				last_cn->next = jl_cn;
			}
			last_cn = jl_cn;
			/* make sure the block we are trying to log is not a block 
			   of journal or reserved area */

			if (is_block_in_log_or_reserved_area
			    (p_s_sb, cn->bh->b_blocknr)) {
				reiserfs_panic(p_s_sb,
					       "journal-2332: Trying to log block %lu, which is a log block\n",
					       cn->bh->b_blocknr);
			}
			jl_cn->blocknr = cn->bh->b_blocknr;
			jl_cn->state = 0;
			jl_cn->sb = p_s_sb;
			jl_cn->bh = cn->bh;
			jl_cn->jlist = jl;
			insert_journal_hash(journal->j_list_hash_table, jl_cn);
			if (i < trans_half) {
				desc->j_realblock[i] =
				    cpu_to_le32(cn->bh->b_blocknr);
			} else {
				commit->j_realblock[i - trans_half] =
				    cpu_to_le32(cn->bh->b_blocknr);
			}
		} else {
			i--;
		}
	}
	set_desc_trans_len(desc, journal->j_len);
	set_desc_mount_id(desc, journal->j_mount_id);
	set_desc_trans_id(desc, journal->j_trans_id);
	set_commit_trans_len(commit, journal->j_len);

	/* special check in case all buffers in the journal were marked for not logging */
	if (journal->j_len == 0) {
		BUG();
	}

	/* we're about to dirty all the log blocks, mark the description block
	 * dirty now too.  Don't mark the commit block dirty until all the
	 * others are on disk
	 */
	mark_buffer_dirty(d_bh);

	/* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
	cur_write_start = journal->j_start;
	cn = journal->j_first;
	jindex = 1;		/* start at one so we don't get the desc again */
	while (cn) {
		clear_buffer_journal_new(cn->bh);
		/* copy all the real blocks into log area.  dirty log blocks */
		if (buffer_journaled(cn->bh)) {
			struct buffer_head *tmp_bh;
			char *addr;
			struct page *page;
			tmp_bh =
			    journal_getblk(p_s_sb,
					   SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
					   ((cur_write_start +
					     jindex) %
					    SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
			set_buffer_uptodate(tmp_bh);
			page = cn->bh->b_page;
			addr = kmap(page);
			memcpy(tmp_bh->b_data,
			       addr + offset_in_page(cn->bh->b_data),
			       cn->bh->b_size);
			kunmap(page);
			mark_buffer_dirty(tmp_bh);
			jindex++;
			set_buffer_journal_dirty(cn->bh);
			clear_buffer_journaled(cn->bh);
		} else {
			/* JDirty cleared sometime during transaction.  don't log this one */
			reiserfs_warning(p_s_sb,
					 "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!");
			brelse(cn->bh);
		}
		next = cn->next;
		free_cnode(p_s_sb, cn);
		cn = next;
		cond_resched();
	}

	/* we are done  with both the c_bh and d_bh, but
	 ** c_bh must be written after all other commit blocks,
	 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
	 */

	journal->j_current_jl = alloc_journal_list(p_s_sb);

	/* now it is safe to insert this transaction on the main list */
	list_add_tail(&jl->j_list, &journal->j_journal_list);
	list_add_tail(&jl->j_working_list, &journal->j_working_list);
	journal->j_num_work_lists++;

	/* reset journal values for the next transaction */
	old_start = journal->j_start;
	journal->j_start =
	    (journal->j_start + journal->j_len +
	     2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb);
	atomic_set(&(journal->j_wcount), 0);
	journal->j_bcount = 0;
	journal->j_last = NULL;
	journal->j_first = NULL;
	journal->j_len = 0;
	journal->j_trans_start_time = 0;
	journal->j_trans_id++;
	journal->j_current_jl->j_trans_id = journal->j_trans_id;
	journal->j_must_wait = 0;
	journal->j_len_alloc = 0;
	journal->j_next_full_flush = 0;
	journal->j_next_async_flush = 0;
	init_journal_hash(p_s_sb);

	// make sure reiserfs_add_jh sees the new current_jl before we
	// write out the tails
	smp_mb();

	/* tail conversion targets have to hit the disk before we end the
	 * transaction.  Otherwise a later transaction might repack the tail
	 * before this transaction commits, leaving the data block unflushed and
	 * clean, if we crash before the later transaction commits, the data block
	 * is lost.
	 */
	if (!list_empty(&jl->j_tail_bh_list)) {
		unlock_kernel();
		write_ordered_buffers(&journal->j_dirty_buffers_lock,
				      journal, jl, &jl->j_tail_bh_list);
		lock_kernel();
	}
	if (!list_empty(&jl->j_tail_bh_list))
		BUG();
	up(&jl->j_commit_lock);

	/* honor the flush wishes from the caller, simple commits can
	 ** be done outside the journal lock, they are done below
	 **
	 ** if we don't flush the commit list right now, we put it into
	 ** the work queue so the people waiting on the async progress work
	 ** queue don't wait for this proc to flush journal lists and such.
	 */
	if (flush) {
		flush_commit_list(p_s_sb, jl, 1);
		flush_journal_list(p_s_sb, jl, 1);
	} else if (!(jl->j_state & LIST_COMMIT_PENDING))
		queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);

	/* if the next transaction has any chance of wrapping, flush 
	 ** transactions that might get overwritten.  If any journal lists are very 
	 ** old flush them as well.  
	 */
      first_jl:
	list_for_each_safe(entry, safe, &journal->j_journal_list) {
		temp_jl = JOURNAL_LIST_ENTRY(entry);
		if (journal->j_start <= temp_jl->j_start) {
			if ((journal->j_start + journal->j_trans_max + 1) >=
			    temp_jl->j_start) {
				flush_used_journal_lists(p_s_sb, temp_jl);
				goto first_jl;
			} else if ((journal->j_start +
				    journal->j_trans_max + 1) <
				   SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
				/* if we don't cross into the next transaction and we don't
				 * wrap, there is no way we can overlap any later transactions
				 * break now
				 */
				break;
			}
		} else if ((journal->j_start +
			    journal->j_trans_max + 1) >
			   SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
			if (((journal->j_start + journal->j_trans_max + 1) %
			     SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >=
			    temp_jl->j_start) {
				flush_used_journal_lists(p_s_sb, temp_jl);
				goto first_jl;
			} else {
				/* we don't overlap anything from out start to the end of the
				 * log, and our wrapped portion doesn't overlap anything at
				 * the start of the log.  We can break
				 */
				break;
			}
		}
	}
	flush_old_journal_lists(p_s_sb);

	journal->j_current_jl->j_list_bitmap =
	    get_list_bitmap(p_s_sb, journal->j_current_jl);

	if (!(journal->j_current_jl->j_list_bitmap)) {
		reiserfs_panic(p_s_sb,
			       "journal-1996: do_journal_end, could not get a list bitmap\n");
	}

	atomic_set(&(journal->j_jlock), 0);
	unlock_journal(p_s_sb);
	/* wake up any body waiting to join. */
	clear_bit(J_WRITERS_QUEUED, &journal->j_state);
	wake_up(&(journal->j_join_wait));

	if (!flush && wait_on_commit &&
	    journal_list_still_alive(p_s_sb, commit_trans_id)) {
		flush_commit_list(p_s_sb, jl, 1);
	}
      out:
	reiserfs_check_lock_depth(p_s_sb, "journal end2");

	memset(th, 0, sizeof(*th));
	/* Re-set th->t_super, so we can properly keep track of how many
	 * persistent transactions there are. We need to do this so if this
	 * call is part of a failed restart_transaction, we can free it later */
	th->t_super = p_s_sb;

	return journal->j_errno;
}

static void __reiserfs_journal_abort_hard(struct super_block *sb)
{
	struct reiserfs_journal *journal = SB_JOURNAL(sb);
	if (test_bit(J_ABORTED, &journal->j_state))
		return;

	printk(KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n",
	       reiserfs_bdevname(sb));

	sb->s_flags |= MS_RDONLY;
	set_bit(J_ABORTED, &journal->j_state);
L
Linus Torvalds 已提交
4207 4208

#ifdef CONFIG_REISERFS_CHECK
4209
	dump_stack();
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4210 4211 4212
#endif
}

4213
static void __reiserfs_journal_abort_soft(struct super_block *sb, int errno)
L
Linus Torvalds 已提交
4214
{
4215 4216 4217
	struct reiserfs_journal *journal = SB_JOURNAL(sb);
	if (test_bit(J_ABORTED, &journal->j_state))
		return;
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Linus Torvalds 已提交
4218

4219 4220
	if (!journal->j_errno)
		journal->j_errno = errno;
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Linus Torvalds 已提交
4221

4222
	__reiserfs_journal_abort_hard(sb);
L
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4223 4224
}

4225
void reiserfs_journal_abort(struct super_block *sb, int errno)
L
Linus Torvalds 已提交
4226
{
4227
	return __reiserfs_journal_abort_soft(sb, errno);
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4228
}