[people/arne_f/kernel.git] / fs / gfs2 / log.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/delay.h>

#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "log.h"
#include "lops.h"
#include "meta_io.h"
#include "util.h"
#include "dir.h"

#define PULL 1

/**
 * gfs2_struct2blk - compute stuff
 * @sdp: the filesystem
 * @nstruct: the number of structures
 * @ssize: the size of the structures
 *
 * Compute the number of log descriptor blocks needed to hold a certain number
 * of structures of a certain size.
 *
 * Returns: the number of blocks needed (minimum is always 1)
 */

unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
			     unsigned int ssize)
{
	unsigned int blks;
	unsigned int first, second;

	blks = 1;
	first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;

	if (nstruct > first) {
		second = (sdp->sd_sb.sb_bsize -
			  sizeof(struct gfs2_meta_header)) / ssize;
		blks += DIV_ROUND_UP(nstruct - first, second);
	}

	return blks;
}

/**
 * gfs2_ail1_start_one - Start I/O on a part of the AIL
 * @sdp: the filesystem
 * @tr: the part of the AIL
 *
 */

static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
{
	struct gfs2_bufdata *bd, *s;
	struct buffer_head *bh;
	int retry;

	BUG_ON(!spin_is_locked(&sdp->sd_log_lock));

	do {
		retry = 0;

		list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
						 bd_ail_st_list) {
			bh = bd->bd_bh;

			gfs2_assert(sdp, bd->bd_ail == ai);

			if (!buffer_busy(bh)) {
				if (!buffer_uptodate(bh)) {
					gfs2_log_unlock(sdp);
					gfs2_io_error_bh(sdp, bh);
					gfs2_log_lock(sdp);
				}
				list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
				continue;
			}

			if (!buffer_dirty(bh))
				continue;

			list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);

			gfs2_log_unlock(sdp);
			wait_on_buffer(bh);
			ll_rw_block(WRITE, 1, &bh);
			gfs2_log_lock(sdp);

			retry = 1;
			break;
		}
	} while (retry);
}

/**
 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
 * @sdp: the filesystem
 * @ai: the AIL entry
 *
 */

static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags)
{
	struct gfs2_bufdata *bd, *s;
	struct buffer_head *bh;

	list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
					 bd_ail_st_list) {
		bh = bd->bd_bh;

		gfs2_assert(sdp, bd->bd_ail == ai);

		if (buffer_busy(bh)) {
			if (flags & DIO_ALL)
				continue;
			else
				break;
		}

		if (!buffer_uptodate(bh))
			gfs2_io_error_bh(sdp, bh);

		list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
	}

	return list_empty(&ai->ai_ail1_list);
}

static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
{
	struct list_head *head = &sdp->sd_ail1_list;
	u64 sync_gen;
	struct list_head *first;
	struct gfs2_ail *first_ai, *ai, *tmp;
	int done = 0;

	gfs2_log_lock(sdp);
	if (list_empty(head)) {
		gfs2_log_unlock(sdp);
		return;
	}
	sync_gen = sdp->sd_ail_sync_gen++;

	first = head->prev;
	first_ai = list_entry(first, struct gfs2_ail, ai_list);
	first_ai->ai_sync_gen = sync_gen;
	gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */

	if (flags & DIO_ALL)
		first = NULL;

	while(!done) {
		if (first && (head->prev != first ||
			      gfs2_ail1_empty_one(sdp, first_ai, 0)))
			break;

		done = 1;
		list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
			if (ai->ai_sync_gen >= sync_gen)
				continue;
			ai->ai_sync_gen = sync_gen;
			gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
			done = 0;
			break;
		}
	}

	gfs2_log_unlock(sdp);
}

int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
{
	struct gfs2_ail *ai, *s;
	int ret;

	gfs2_log_lock(sdp);

	list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
		if (gfs2_ail1_empty_one(sdp, ai, flags))
			list_move(&ai->ai_list, &sdp->sd_ail2_list);
		else if (!(flags & DIO_ALL))
			break;
	}

	ret = list_empty(&sdp->sd_ail1_list);

	gfs2_log_unlock(sdp);

	return ret;
}


/**
 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
 * @sdp: the filesystem
 * @ai: the AIL entry
 *
 */

static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
{
	struct list_head *head = &ai->ai_ail2_list;
	struct gfs2_bufdata *bd;

	while (!list_empty(head)) {
		bd = list_entry(head->prev, struct gfs2_bufdata,
				bd_ail_st_list);
		gfs2_assert(sdp, bd->bd_ail == ai);
		bd->bd_ail = NULL;
		list_del(&bd->bd_ail_st_list);
		list_del(&bd->bd_ail_gl_list);
		atomic_dec(&bd->bd_gl->gl_ail_count);
		brelse(bd->bd_bh);
	}
}

static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
{
	struct gfs2_ail *ai, *safe;
	unsigned int old_tail = sdp->sd_log_tail;
	int wrap = (new_tail < old_tail);
	int a, b, rm;

	gfs2_log_lock(sdp);

	list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
		a = (old_tail <= ai->ai_first);
		b = (ai->ai_first < new_tail);
		rm = (wrap) ? (a || b) : (a && b);
		if (!rm)
			continue;

		gfs2_ail2_empty_one(sdp, ai);
		list_del(&ai->ai_list);
		gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
		gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
		kfree(ai);
	}

	gfs2_log_unlock(sdp);
}

/**
 * gfs2_log_reserve - Make a log reservation
 * @sdp: The GFS2 superblock
 * @blks: The number of blocks to reserve
 *
 * Note that we never give out the last 6 blocks of the journal. Thats
 * due to the fact that there is are a small number of header blocks
 * associated with each log flush. The exact number can't be known until
 * flush time, so we ensure that we have just enough free blocks at all
 * times to avoid running out during a log flush.
 *
 * Returns: errno
 */

int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
{
	unsigned int try = 0;

	if (gfs2_assert_warn(sdp, blks) ||
	    gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
		return -EINVAL;

	mutex_lock(&sdp->sd_log_reserve_mutex);
	gfs2_log_lock(sdp);
	while(sdp->sd_log_blks_free <= (blks + 6)) {
		gfs2_log_unlock(sdp);
		gfs2_ail1_empty(sdp, 0);
		gfs2_log_flush(sdp, NULL);

		if (try++)
			gfs2_ail1_start(sdp, 0);
		gfs2_log_lock(sdp);
	}
	sdp->sd_log_blks_free -= blks;
	gfs2_log_unlock(sdp);
	mutex_unlock(&sdp->sd_log_reserve_mutex);

	down_read(&sdp->sd_log_flush_lock);

	return 0;
}

/**
 * gfs2_log_release - Release a given number of log blocks
 * @sdp: The GFS2 superblock
 * @blks: The number of blocks
 *
 */

void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
{

	gfs2_log_lock(sdp);
	sdp->sd_log_blks_free += blks;
	gfs2_assert_withdraw(sdp,
			     sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
	gfs2_log_unlock(sdp);
	up_read(&sdp->sd_log_flush_lock);
}

static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
{
	struct inode *inode = sdp->sd_jdesc->jd_inode;
	int error;
	struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };

	bh_map.b_size = 1 << inode->i_blkbits;
	error = gfs2_block_map(inode, lbn, 0, &bh_map);
	if (error || !bh_map.b_blocknr)
		printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error,
		       (unsigned long long)bh_map.b_blocknr, lbn);
	gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr);

	return bh_map.b_blocknr;
}

/**
 * log_distance - Compute distance between two journal blocks
 * @sdp: The GFS2 superblock
 * @newer: The most recent journal block of the pair
 * @older: The older journal block of the pair
 *
 *   Compute the distance (in the journal direction) between two
 *   blocks in the journal
 *
 * Returns: the distance in blocks
 */

static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
					unsigned int older)
{
	int dist;

	dist = newer - older;
	if (dist < 0)
		dist += sdp->sd_jdesc->jd_blocks;

	return dist;
}

static unsigned int current_tail(struct gfs2_sbd *sdp)
{
	struct gfs2_ail *ai;
	unsigned int tail;

	gfs2_log_lock(sdp);

	if (list_empty(&sdp->sd_ail1_list)) {
		tail = sdp->sd_log_head;
	} else {
		ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
		tail = ai->ai_first;
	}

	gfs2_log_unlock(sdp);

	return tail;
}

static inline void log_incr_head(struct gfs2_sbd *sdp)
{
	if (sdp->sd_log_flush_head == sdp->sd_log_tail)
		gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head);

	if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
		sdp->sd_log_flush_head = 0;
		sdp->sd_log_flush_wrapped = 1;
	}
}

/**
 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
 * @sdp: The GFS2 superblock
 *
 * Returns: the buffer_head
 */

struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
{
	u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
	struct gfs2_log_buf *lb;
	struct buffer_head *bh;

	lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
	list_add(&lb->lb_list, &sdp->sd_log_flush_list);

	bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno);
	lock_buffer(bh);
	memset(bh->b_data, 0, bh->b_size);
	set_buffer_uptodate(bh);
	clear_buffer_dirty(bh);
	unlock_buffer(bh);

	log_incr_head(sdp);

	return bh;
}

/**
 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
 * @sdp: the filesystem
 * @data: the data the buffer_head should point to
 *
 * Returns: the log buffer descriptor
 */

struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
				      struct buffer_head *real)
{
	u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
	struct gfs2_log_buf *lb;
	struct buffer_head *bh;

	lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL);
	list_add(&lb->lb_list, &sdp->sd_log_flush_list);
	lb->lb_real = real;

	bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
	atomic_set(&bh->b_count, 1);
	bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate);
	set_bh_page(bh, real->b_page, bh_offset(real));
	bh->b_blocknr = blkno;
	bh->b_size = sdp->sd_sb.sb_bsize;
	bh->b_bdev = sdp->sd_vfs->s_bdev;

	log_incr_head(sdp);

	return bh;
}

static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull)
{
	unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);

	ail2_empty(sdp, new_tail);

	gfs2_log_lock(sdp);
	sdp->sd_log_blks_free += dist - (pull ? 1 : 0);
	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
	gfs2_log_unlock(sdp);

	sdp->sd_log_tail = new_tail;
}

/**
 * log_write_header - Get and initialize a journal header buffer
 * @sdp: The GFS2 superblock
 *
 * Returns: the initialized log buffer descriptor
 */

static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
{
	u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
	struct buffer_head *bh;
	struct gfs2_log_header *lh;
	unsigned int tail;
	u32 hash;

	bh = sb_getblk(sdp->sd_vfs, blkno);
	lock_buffer(bh);
	memset(bh->b_data, 0, bh->b_size);
	set_buffer_uptodate(bh);
	clear_buffer_dirty(bh);
	unlock_buffer(bh);

	gfs2_ail1_empty(sdp, 0);
	tail = current_tail(sdp);

	lh = (struct gfs2_log_header *)bh->b_data;
	memset(lh, 0, sizeof(struct gfs2_log_header));
	lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
	lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
	lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
	lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
	lh->lh_flags = cpu_to_be32(flags);
	lh->lh_tail = cpu_to_be32(tail);
	lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
	hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
	lh->lh_hash = cpu_to_be32(hash);

	set_buffer_dirty(bh);
	if (sync_dirty_buffer(bh))
		gfs2_io_error_bh(sdp, bh);
	brelse(bh);

	if (sdp->sd_log_tail != tail)
		log_pull_tail(sdp, tail, pull);
	else
		gfs2_assert_withdraw(sdp, !pull);

	sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
	log_incr_head(sdp);
}

static void log_flush_commit(struct gfs2_sbd *sdp)
{
	struct list_head *head = &sdp->sd_log_flush_list;
	struct gfs2_log_buf *lb;
	struct buffer_head *bh;

	while (!list_empty(head)) {
		lb = list_entry(head->next, struct gfs2_log_buf, lb_list);
		list_del(&lb->lb_list);
		bh = lb->lb_bh;

		wait_on_buffer(bh);
		if (!buffer_uptodate(bh))
			gfs2_io_error_bh(sdp, bh);
		if (lb->lb_real) {
			while (atomic_read(&bh->b_count) != 1)  /* Grrrr... */
				schedule();
			free_buffer_head(bh);
		} else
			brelse(bh);
		kfree(lb);
	}

	log_write_header(sdp, 0, 0);
}

/**
 * gfs2_log_flush - flush incore transaction(s)
 * @sdp: the filesystem
 * @gl: The glock structure to flush.  If NULL, flush the whole incore log
 *
 */

void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
{
	struct gfs2_ail *ai;

	down_write(&sdp->sd_log_flush_lock);

	if (gl) {
		gfs2_log_lock(sdp);
		if (list_empty(&gl->gl_le.le_list)) {
			gfs2_log_unlock(sdp);
			up_write(&sdp->sd_log_flush_lock);
			return;
		}
		gfs2_log_unlock(sdp);
	}

	ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
	INIT_LIST_HEAD(&ai->ai_ail1_list);
	INIT_LIST_HEAD(&ai->ai_ail2_list);

	gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf);
	gfs2_assert_withdraw(sdp,
			sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);

	sdp->sd_log_flush_head = sdp->sd_log_head;
	sdp->sd_log_flush_wrapped = 0;
	ai->ai_first = sdp->sd_log_flush_head;

	lops_before_commit(sdp);
	if (!list_empty(&sdp->sd_log_flush_list))
		log_flush_commit(sdp);
	else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle)
		log_write_header(sdp, 0, PULL);
	lops_after_commit(sdp, ai);

	gfs2_log_lock(sdp);
	sdp->sd_log_head = sdp->sd_log_flush_head;
	sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs;
	sdp->sd_log_blks_reserved = 0;
	sdp->sd_log_commited_buf = 0;
	sdp->sd_log_num_hdrs = 0;
	sdp->sd_log_commited_revoke = 0;

	if (!list_empty(&ai->ai_ail1_list)) {
		list_add(&ai->ai_list, &sdp->sd_ail1_list);
		ai = NULL;
	}
	gfs2_log_unlock(sdp);

	sdp->sd_vfs->s_dirt = 0;
	up_write(&sdp->sd_log_flush_lock);

	kfree(ai);
}

static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
	unsigned int reserved = 0;
	unsigned int old;

	gfs2_log_lock(sdp);

	sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
	gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0);
	sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
	gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);

	if (sdp->sd_log_commited_buf)
		reserved += sdp->sd_log_commited_buf;
	if (sdp->sd_log_commited_revoke)
		reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
					    sizeof(u64));
	if (reserved)
		reserved++;

	old = sdp->sd_log_blks_free;
	sdp->sd_log_blks_free += tr->tr_reserved -
				 (reserved - sdp->sd_log_blks_reserved);

	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old);
	gfs2_assert_withdraw(sdp,
			     sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks +
			     sdp->sd_log_num_hdrs);

	sdp->sd_log_blks_reserved = reserved;

	gfs2_log_unlock(sdp);
}

/**
 * gfs2_log_commit - Commit a transaction to the log
 * @sdp: the filesystem
 * @tr: the transaction
 *
 * Returns: errno
 */

void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
{
	log_refund(sdp, tr);
	lops_incore_commit(sdp, tr);

	sdp->sd_vfs->s_dirt = 1;
	up_read(&sdp->sd_log_flush_lock);

	gfs2_log_lock(sdp);
	if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
		wake_up_process(sdp->sd_logd_process);
	gfs2_log_unlock(sdp);
}

/**
 * gfs2_log_shutdown - write a shutdown header into a journal
 * @sdp: the filesystem
 *
 */

void gfs2_log_shutdown(struct gfs2_sbd *sdp)
{
	down_write(&sdp->sd_log_flush_lock);

	gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs);
	gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));

	sdp->sd_log_flush_head = sdp->sd_log_head;
	sdp->sd_log_flush_wrapped = 0;

	log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0);

	gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks);
	gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
	gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));

	sdp->sd_log_head = sdp->sd_log_flush_head;
	sdp->sd_log_tail = sdp->sd_log_head;

	up_write(&sdp->sd_log_flush_lock);
}


/**
 * gfs2_meta_syncfs - sync all the buffers in a filesystem
 * @sdp: the filesystem
 *
 */

void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
{
	gfs2_log_flush(sdp, NULL);
	for (;;) {
		gfs2_ail1_start(sdp, DIO_ALL);
		if (gfs2_ail1_empty(sdp, DIO_ALL))
			break;
		msleep(10);
	}
}
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
	9
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/completion.h>
	14	#include <linux/buffer_head.h>
5c676f6d	15	#include <linux/gfs2_ondisk.h>
71b86f56	16	#include <linux/crc32.h>
7d308590	17	#include <linux/lm_interface.h>
a25311c8	18	#include <linux/delay.h>
b3b94faa DT	19
b3b94faa DT	20	#include "gfs2.h"
5c676f6d	21	#include "incore.h"
b3b94faa DT	22	#include "bmap.h"
	23	#include "glock.h"
	24	#include "log.h"
	25	#include "lops.h"
	26	#include "meta_io.h"
5c676f6d	27	#include "util.h"
71b86f56	28	#include "dir.h"
b3b94faa DT	29
	30	#define PULL 1
	31
b3b94faa DT	32	/**
	33	* gfs2_struct2blk - compute stuff
	34	* @sdp: the filesystem
	35	* @nstruct: the number of structures
	36	* @ssize: the size of the structures
	37	*
	38	* Compute the number of log descriptor blocks needed to hold a certain number
	39	* of structures of a certain size.
	40	*
	41	* Returns: the number of blocks needed (minimum is always 1)
	42	*/
	43
	44	unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
	45	unsigned int ssize)
	46	{
	47	unsigned int blks;
	48	unsigned int first, second;
	49
	50	blks = 1;
faa31ce8	51	first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
b3b94faa DT	52
b3b94faa DT	53	if (nstruct > first) {
568f4c96 SW	54	second = (sdp->sd_sb.sb_bsize -
568f4c96 SW	55	sizeof(struct gfs2_meta_header)) / ssize;
5c676f6d	56	blks += DIV_ROUND_UP(nstruct - first, second);
b3b94faa DT	57	}
	58
	59	return blks;
	60	}
	61
ddacfaf7 SW	62	/**
	63	* gfs2_ail1_start_one - Start I/O on a part of the AIL
	64	* @sdp: the filesystem
	65	* @tr: the part of the AIL
	66	*
	67	*/
	68
	69	static void gfs2_ail1_start_one(struct gfs2_sbd sdp, struct gfs2_ail ai)
	70	{
	71	struct gfs2_bufdata bd, s;
	72	struct buffer_head *bh;
	73	int retry;
	74
	75	BUG_ON(!spin_is_locked(&sdp->sd_log_lock));
	76
	77	do {
	78	retry = 0;
	79
	80	list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
	81	bd_ail_st_list) {
	82	bh = bd->bd_bh;
	83
	84	gfs2_assert(sdp, bd->bd_ail == ai);
	85
	86	if (!buffer_busy(bh)) {
	87	if (!buffer_uptodate(bh)) {
	88	gfs2_log_unlock(sdp);
	89	gfs2_io_error_bh(sdp, bh);
	90	gfs2_log_lock(sdp);
	91	}
	92	list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
	93	continue;
	94	}
	95
	96	if (!buffer_dirty(bh))
	97	continue;
	98
	99	list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
	100
	101	gfs2_log_unlock(sdp);
	102	wait_on_buffer(bh);
	103	ll_rw_block(WRITE, 1, &bh);
	104	gfs2_log_lock(sdp);
	105
	106	retry = 1;
	107	break;
	108	}
	109	} while (retry);
	110	}
	111
	112	/**
	113	* gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
	114	* @sdp: the filesystem
	115	* @ai: the AIL entry
	116	*
	117	*/
	118
	119	static int gfs2_ail1_empty_one(struct gfs2_sbd sdp, struct gfs2_ail ai, int flags)
	120	{
	121	struct gfs2_bufdata bd, s;
	122	struct buffer_head *bh;
	123
	124	list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list,
	125	bd_ail_st_list) {
126	bh = bd->bd_bh;
127
128	gfs2_assert(sdp, bd->bd_ail == ai);
129
130	if (buffer_busy(bh)) {
131	if (flags & DIO_ALL)
132	continue;
133	else
134	break;
135	}
136
137	if (!buffer_uptodate(bh))
138	gfs2_io_error_bh(sdp, bh);
139
140	list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list);
141	}
142
143	return list_empty(&ai->ai_ail1_list);
144	}
145
a25311c8	146	static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
b3b94faa DT	147	{
b3b94faa DT	148	struct list_head *head = &sdp->sd_ail1_list;
cd915493	149	u64 sync_gen;
74669416 SW	150	struct list_head *first;
	151	struct gfs2_ail first_ai, ai, *tmp;
	152	int done = 0;
b3b94faa DT	153
	154	gfs2_log_lock(sdp);
	155	if (list_empty(head)) {
	156	gfs2_log_unlock(sdp);
	157	return;
	158	}
	159	sync_gen = sdp->sd_ail_sync_gen++;
	160
	161	first = head->prev;
	162	first_ai = list_entry(first, struct gfs2_ail, ai_list);
	163	first_ai->ai_sync_gen = sync_gen;
74669416	164	gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
b3b94faa DT	165
	166	if (flags & DIO_ALL)
	167	first = NULL;
	168
74669416	169	while(!done) {
484adff8 SW	170	if (first && (head->prev != first \|\|
484adff8 SW	171	gfs2_ail1_empty_one(sdp, first_ai, 0)))
b3b94faa DT	172	break;
b3b94faa DT	173
74669416 SW	174	done = 1;
74669416 SW	175	list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
b3b94faa DT	176	if (ai->ai_sync_gen >= sync_gen)
	177	continue;
	178	ai->ai_sync_gen = sync_gen;
74669416 SW	179	gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
74669416 SW	180	done = 0;
b3b94faa DT	181	break;
b3b94faa DT	182	}
b3b94faa DT	183	}
	184
	185	gfs2_log_unlock(sdp);
	186	}
	187
	188	int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
	189	{
	190	struct gfs2_ail ai, s;
	191	int ret;
	192
	193	gfs2_log_lock(sdp);
	194
	195	list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) {
	196	if (gfs2_ail1_empty_one(sdp, ai, flags))
	197	list_move(&ai->ai_list, &sdp->sd_ail2_list);
	198	else if (!(flags & DIO_ALL))
	199	break;
	200	}
	201
	202	ret = list_empty(&sdp->sd_ail1_list);
	203
	204	gfs2_log_unlock(sdp);
	205
	206	return ret;
	207	}
	208
ddacfaf7 SW	209
	210	/**
	211	* gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
	212	* @sdp: the filesystem
	213	* @ai: the AIL entry
	214	*
	215	*/
	216
	217	static void gfs2_ail2_empty_one(struct gfs2_sbd sdp, struct gfs2_ail ai)
	218	{
	219	struct list_head *head = &ai->ai_ail2_list;
	220	struct gfs2_bufdata *bd;
	221
	222	while (!list_empty(head)) {
	223	bd = list_entry(head->prev, struct gfs2_bufdata,
	224	bd_ail_st_list);
	225	gfs2_assert(sdp, bd->bd_ail == ai);
	226	bd->bd_ail = NULL;
	227	list_del(&bd->bd_ail_st_list);
	228	list_del(&bd->bd_ail_gl_list);
	229	atomic_dec(&bd->bd_gl->gl_ail_count);
	230	brelse(bd->bd_bh);
	231	}
	232	}
	233
b3b94faa DT	234	static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
	235	{
	236	struct gfs2_ail ai, safe;
	237	unsigned int old_tail = sdp->sd_log_tail;
	238	int wrap = (new_tail < old_tail);
	239	int a, b, rm;
	240
	241	gfs2_log_lock(sdp);
	242
	243	list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) {
	244	a = (old_tail <= ai->ai_first);
	245	b = (ai->ai_first < new_tail);
	246	rm = (wrap) ? (a \|\| b) : (a && b);
	247	if (!rm)
	248	continue;
	249
	250	gfs2_ail2_empty_one(sdp, ai);
	251	list_del(&ai->ai_list);
	252	gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list));
	253	gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list));
	254	kfree(ai);
	255	}
	256
	257	gfs2_log_unlock(sdp);
	258	}
	259
	260	/**
	261	* gfs2_log_reserve - Make a log reservation
	262	* @sdp: The GFS2 superblock
	263	* @blks: The number of blocks to reserve
	264	*
b004157a SW	265	* Note that we never give out the last 6 blocks of the journal. Thats
	266	* due to the fact that there is are a small number of header blocks
	267	* associated with each log flush. The exact number can't be known until
	268	* flush time, so we ensure that we have just enough free blocks at all
	269	* times to avoid running out during a log flush.
	270	*
b3b94faa DT	271	* Returns: errno
	272	*/
	273
	274	int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
	275	{
b3b94faa DT	276	unsigned int try = 0;
	277
	278	if (gfs2_assert_warn(sdp, blks) \|\|
	279	gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
	280	return -EINVAL;
	281
71b86f56	282	mutex_lock(&sdp->sd_log_reserve_mutex);
484adff8	283	gfs2_log_lock(sdp);
b004157a	284	while(sdp->sd_log_blks_free <= (blks + 6)) {
b3b94faa	285	gfs2_log_unlock(sdp);
b3b94faa	286	gfs2_ail1_empty(sdp, 0);
b09e593d	287	gfs2_log_flush(sdp, NULL);
b3b94faa DT	288
	289	if (try++)
	290	gfs2_ail1_start(sdp, 0);
484adff8	291	gfs2_log_lock(sdp);
b3b94faa	292	}
484adff8 SW	293	sdp->sd_log_blks_free -= blks;
	294	gfs2_log_unlock(sdp);
	295	mutex_unlock(&sdp->sd_log_reserve_mutex);
	296
	297	down_read(&sdp->sd_log_flush_lock);
b3b94faa DT	298
	299	return 0;
	300	}
	301
	302	/**
	303	* gfs2_log_release - Release a given number of log blocks
	304	* @sdp: The GFS2 superblock
	305	* @blks: The number of blocks
	306	*
	307	*/
	308
	309	void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
	310	{
b3b94faa DT	311
	312	gfs2_log_lock(sdp);
	313	sdp->sd_log_blks_free += blks;
	314	gfs2_assert_withdraw(sdp,
	315	sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
	316	gfs2_log_unlock(sdp);
ed386507	317	up_read(&sdp->sd_log_flush_lock);
b3b94faa DT	318	}
b3b94faa DT	319
cd915493	320	static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
b3b94faa	321	{
23591256	322	struct inode *inode = sdp->sd_jdesc->jd_inode;
b3b94faa	323	int error;
23591256	324	struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
b3b94faa	325
23591256 SW	326	bh_map.b_size = 1 << inode->i_blkbits;
23591256 SW	327	error = gfs2_block_map(inode, lbn, 0, &bh_map);
7a6bbacb	328	if (error \|\| !bh_map.b_blocknr)
aed3255f RK	329	printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error,
aed3255f RK	330	(unsigned long long)bh_map.b_blocknr, lbn);
7a6bbacb	331	gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr);
b3b94faa	332
7a6bbacb	333	return bh_map.b_blocknr;
b3b94faa DT	334	}
	335
	336	/**
	337	* log_distance - Compute distance between two journal blocks
	338	* @sdp: The GFS2 superblock
	339	* @newer: The most recent journal block of the pair
	340	* @older: The older journal block of the pair
	341	*
	342	* Compute the distance (in the journal direction) between two
	343	* blocks in the journal
	344	*
	345	* Returns: the distance in blocks
	346	*/
	347
faa31ce8	348	static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
b3b94faa DT	349	unsigned int older)
	350	{
	351	int dist;
	352
	353	dist = newer - older;
	354	if (dist < 0)
	355	dist += sdp->sd_jdesc->jd_blocks;
	356
	357	return dist;
	358	}
	359
	360	static unsigned int current_tail(struct gfs2_sbd *sdp)
	361	{
	362	struct gfs2_ail *ai;
	363	unsigned int tail;
	364
	365	gfs2_log_lock(sdp);
	366
faa31ce8	367	if (list_empty(&sdp->sd_ail1_list)) {
b3b94faa	368	tail = sdp->sd_log_head;
faa31ce8 SW	369	} else {
faa31ce8 SW	370	ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list);
b3b94faa DT	371	tail = ai->ai_first;
	372	}
	373
	374	gfs2_log_unlock(sdp);
	375
	376	return tail;
	377	}
	378
	379	static inline void log_incr_head(struct gfs2_sbd *sdp)
	380	{
	381	if (sdp->sd_log_flush_head == sdp->sd_log_tail)
faa31ce8	382	gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head);
b3b94faa DT	383
	384	if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
	385	sdp->sd_log_flush_head = 0;
	386	sdp->sd_log_flush_wrapped = 1;
	387	}
	388	}
	389
	390	/**
	391	* gfs2_log_get_buf - Get and initialize a buffer to use for log control data
	392	* @sdp: The GFS2 superblock
	393	*
	394	* Returns: the buffer_head
	395	*/
	396
	397	struct buffer_head gfs2_log_get_buf(struct gfs2_sbd sdp)
	398	{
cd915493	399	u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
b3b94faa DT	400	struct gfs2_log_buf *lb;
	401	struct buffer_head *bh;
	402
4f3df041	403	lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS \| __GFP_NOFAIL);
b3b94faa DT	404	list_add(&lb->lb_list, &sdp->sd_log_flush_list);
	405
	406	bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno);
	407	lock_buffer(bh);
	408	memset(bh->b_data, 0, bh->b_size);
	409	set_buffer_uptodate(bh);
	410	clear_buffer_dirty(bh);
	411	unlock_buffer(bh);
	412
	413	log_incr_head(sdp);
	414
	415	return bh;
	416	}
	417
	418	/**
	419	* gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
	420	* @sdp: the filesystem
	421	* @data: the data the buffer_head should point to
	422	*
	423	* Returns: the log buffer descriptor
	424	*/
	425
	426	struct buffer_head gfs2_log_fake_buf(struct gfs2_sbd sdp,
	427	struct buffer_head *real)
	428	{
cd915493	429	u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
b3b94faa DT	430	struct gfs2_log_buf *lb;
	431	struct buffer_head *bh;
	432
4f3df041	433	lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS \| __GFP_NOFAIL);
b3b94faa DT	434	list_add(&lb->lb_list, &sdp->sd_log_flush_list);
	435	lb->lb_real = real;
	436
	437	bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS \| __GFP_NOFAIL);
	438	atomic_set(&bh->b_count, 1);
	439	bh->b_state = (1 << BH_Mapped) \| (1 << BH_Uptodate);
18ec7d5c	440	set_bh_page(bh, real->b_page, bh_offset(real));
b3b94faa DT	441	bh->b_blocknr = blkno;
	442	bh->b_size = sdp->sd_sb.sb_bsize;
	443	bh->b_bdev = sdp->sd_vfs->s_bdev;
	444
	445	log_incr_head(sdp);
	446
	447	return bh;
	448	}
	449
	450	static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull)
	451	{
	452	unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
	453
	454	ail2_empty(sdp, new_tail);
	455
	456	gfs2_log_lock(sdp);
c5392124	457	sdp->sd_log_blks_free += dist - (pull ? 1 : 0);
faa31ce8	458	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
b3b94faa DT	459	gfs2_log_unlock(sdp);
	460
	461	sdp->sd_log_tail = new_tail;
	462	}
	463
	464	/**
	465	* log_write_header - Get and initialize a journal header buffer
	466	* @sdp: The GFS2 superblock
	467	*
	468	* Returns: the initialized log buffer descriptor
	469	*/
	470
cd915493	471	static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
b3b94faa	472	{
cd915493	473	u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head);
b3b94faa DT	474	struct buffer_head *bh;
	475	struct gfs2_log_header *lh;
	476	unsigned int tail;
cd915493	477	u32 hash;
b3b94faa	478
b3b94faa DT	479	bh = sb_getblk(sdp->sd_vfs, blkno);
	480	lock_buffer(bh);
	481	memset(bh->b_data, 0, bh->b_size);
	482	set_buffer_uptodate(bh);
	483	clear_buffer_dirty(bh);
	484	unlock_buffer(bh);
	485
	486	gfs2_ail1_empty(sdp, 0);
	487	tail = current_tail(sdp);
	488
	489	lh = (struct gfs2_log_header *)bh->b_data;
	490	memset(lh, 0, sizeof(struct gfs2_log_header));
	491	lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
e3167ded SW	492	lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
e3167ded SW	493	lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
e0f2bf78 SW	494	lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
	495	lh->lh_flags = cpu_to_be32(flags);
	496	lh->lh_tail = cpu_to_be32(tail);
	497	lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
b3b94faa DT	498	hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header));
	499	lh->lh_hash = cpu_to_be32(hash);
	500
	501	set_buffer_dirty(bh);
	502	if (sync_dirty_buffer(bh))
	503	gfs2_io_error_bh(sdp, bh);
	504	brelse(bh);
	505
	506	if (sdp->sd_log_tail != tail)
	507	log_pull_tail(sdp, tail, pull);
	508	else
	509	gfs2_assert_withdraw(sdp, !pull);
	510
	511	sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
	512	log_incr_head(sdp);
	513	}
	514
	515	static void log_flush_commit(struct gfs2_sbd *sdp)
	516	{
	517	struct list_head *head = &sdp->sd_log_flush_list;
	518	struct gfs2_log_buf *lb;
	519	struct buffer_head *bh;
b3b94faa DT	520
	521	while (!list_empty(head)) {
	522	lb = list_entry(head->next, struct gfs2_log_buf, lb_list);
	523	list_del(&lb->lb_list);
	524	bh = lb->lb_bh;
	525
	526	wait_on_buffer(bh);
	527	if (!buffer_uptodate(bh))
	528	gfs2_io_error_bh(sdp, bh);
	529	if (lb->lb_real) {
	530	while (atomic_read(&bh->b_count) != 1) /* Grrrr... */
	531	schedule();
	532	free_buffer_head(bh);
	533	} else
	534	brelse(bh);
	535	kfree(lb);
	536	}
	537
	538	log_write_header(sdp, 0, 0);
	539	}
	540
	541	/**
b09e593d	542	* gfs2_log_flush - flush incore transaction(s)
b3b94faa DT	543	* @sdp: the filesystem
	544	* @gl: The glock structure to flush. If NULL, flush the whole incore log
	545	*
	546	*/
	547
b09e593d	548	void gfs2_log_flush(struct gfs2_sbd sdp, struct gfs2_glock gl)
b3b94faa DT	549	{
	550	struct gfs2_ail *ai;
	551
484adff8	552	down_write(&sdp->sd_log_flush_lock);
f55ab26a SW	553
	554	if (gl) {
	555	gfs2_log_lock(sdp);
	556	if (list_empty(&gl->gl_le.le_list)) {
	557	gfs2_log_unlock(sdp);
484adff8	558	up_write(&sdp->sd_log_flush_lock);
f55ab26a SW	559	return;
	560	}
	561	gfs2_log_unlock(sdp);
	562	}
	563
b09e593d SW	564	ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS \| __GFP_NOFAIL);
	565	INIT_LIST_HEAD(&ai->ai_ail1_list);
	566	INIT_LIST_HEAD(&ai->ai_ail2_list);
b3b94faa	567
faa31ce8	568	gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf);
b3b94faa DT	569	gfs2_assert_withdraw(sdp,
	570	sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
	571
b3b94faa DT	572	sdp->sd_log_flush_head = sdp->sd_log_head;
	573	sdp->sd_log_flush_wrapped = 0;
	574	ai->ai_first = sdp->sd_log_flush_head;
	575
	576	lops_before_commit(sdp);
	577	if (!list_empty(&sdp->sd_log_flush_list))
	578	log_flush_commit(sdp);
	579	else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle)
	580	log_write_header(sdp, 0, PULL);
	581	lops_after_commit(sdp, ai);
b09e593d	582
fe1a698f SW	583	gfs2_log_lock(sdp);
fe1a698f SW	584	sdp->sd_log_head = sdp->sd_log_flush_head;
f4154ea0	585	sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs;
faa31ce8 SW	586	sdp->sd_log_blks_reserved = 0;
	587	sdp->sd_log_commited_buf = 0;
	588	sdp->sd_log_num_hdrs = 0;
	589	sdp->sd_log_commited_revoke = 0;
b3b94faa	590
b3b94faa DT	591	if (!list_empty(&ai->ai_ail1_list)) {
	592	list_add(&ai->ai_list, &sdp->sd_ail1_list);
	593	ai = NULL;
	594	}
	595	gfs2_log_unlock(sdp);
	596
b3b94faa	597	sdp->sd_vfs->s_dirt = 0;
484adff8	598	up_write(&sdp->sd_log_flush_lock);
b3b94faa DT	599
	600	kfree(ai);
	601	}
	602
	603	static void log_refund(struct gfs2_sbd sdp, struct gfs2_trans tr)
	604	{
5dc39fe6	605	unsigned int reserved = 0;
b3b94faa DT	606	unsigned int old;
	607
	608	gfs2_log_lock(sdp);
	609
	610	sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
	611	gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0);
	612	sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
	613	gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
	614
	615	if (sdp->sd_log_commited_buf)
f4154ea0	616	reserved += sdp->sd_log_commited_buf;
b3b94faa DT	617	if (sdp->sd_log_commited_revoke)
b3b94faa DT	618	reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
cd915493	619	sizeof(u64));
5dc39fe6 BM	620	if (reserved)
5dc39fe6 BM	621	reserved++;
b3b94faa DT	622
	623	old = sdp->sd_log_blks_free;
	624	sdp->sd_log_blks_free += tr->tr_reserved -
	625	(reserved - sdp->sd_log_blks_reserved);
	626
b09e593d	627	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old);
b3b94faa	628	gfs2_assert_withdraw(sdp,
f4154ea0 SW	629	sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks +
f4154ea0 SW	630	sdp->sd_log_num_hdrs);
b3b94faa DT	631
	632	sdp->sd_log_blks_reserved = reserved;
	633
	634	gfs2_log_unlock(sdp);
	635	}
	636
	637	/**
	638	* gfs2_log_commit - Commit a transaction to the log
	639	* @sdp: the filesystem
	640	* @tr: the transaction
	641	*
	642	* Returns: errno
	643	*/
	644
	645	void gfs2_log_commit(struct gfs2_sbd sdp, struct gfs2_trans tr)
	646	{
	647	log_refund(sdp, tr);
	648	lops_incore_commit(sdp, tr);
	649
	650	sdp->sd_vfs->s_dirt = 1;
484adff8	651	up_read(&sdp->sd_log_flush_lock);
b3b94faa	652
b3b94faa	653	gfs2_log_lock(sdp);
b004157a SW	654	if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
	655	wake_up_process(sdp->sd_logd_process);
	656	gfs2_log_unlock(sdp);
b3b94faa DT	657	}
	658
	659	/**
	660	* gfs2_log_shutdown - write a shutdown header into a journal
	661	* @sdp: the filesystem
	662	*
	663	*/
	664
	665	void gfs2_log_shutdown(struct gfs2_sbd *sdp)
	666	{
484adff8	667	down_write(&sdp->sd_log_flush_lock);
b3b94faa	668
b3b94faa DT	669	gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
	670	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
	671	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
18ec7d5c	672	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata);
b3b94faa DT	673	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
	674	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
	675	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
190562bd	676	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs);
b3b94faa DT	677	gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
	678
	679	sdp->sd_log_flush_head = sdp->sd_log_head;
	680	sdp->sd_log_flush_wrapped = 0;
	681
	682	log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0);
	683
a74604be SW	684	gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks);
	685	gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
	686	gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
b3b94faa DT	687
b3b94faa DT	688	sdp->sd_log_head = sdp->sd_log_flush_head;
b3b94faa DT	689	sdp->sd_log_tail = sdp->sd_log_head;
b3b94faa DT	690
484adff8	691	up_write(&sdp->sd_log_flush_lock);
b3b94faa DT	692	}
b3b94faa DT	693
a25311c8 SW	694
	695	/**
	696	* gfs2_meta_syncfs - sync all the buffers in a filesystem
	697	* @sdp: the filesystem
	698	*
	699	*/
	700
	701	void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
	702	{
	703	gfs2_log_flush(sdp, NULL);
	704	for (;;) {
	705	gfs2_ail1_start(sdp, DIO_ALL);
	706	if (gfs2_ail1_empty(sdp, DIO_ALL))
	707	break;
	708	msleep(10);
	709	}
	710	}
	711