[deliverable/linux.git] / fs / gfs2 / trans.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/kallsyms.h>
#include <linux/gfs2_ondisk.h>

#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "inode.h"
#include "log.h"
#include "lops.h"
#include "meta_io.h"
#include "trans.h"
#include "util.h"
#include "trace_gfs2.h"

int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
		     unsigned int revokes)
{
	struct gfs2_trans *tr;
	int error;

	BUG_ON(current->journal_info);
	BUG_ON(blocks == 0 && revokes == 0);

	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
		return -EROFS;

	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
	if (!tr)
		return -ENOMEM;

	tr->tr_ip = (unsigned long)__builtin_return_address(0);
	tr->tr_blocks = blocks;
	tr->tr_revokes = revokes;
	tr->tr_reserved = 1;
	if (blocks)
		tr->tr_reserved += 6 + blocks;
	if (revokes)
		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
						   sizeof(u64));
	sb_start_intwrite(sdp->sd_vfs);
	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);

	error = gfs2_glock_nq(&tr->tr_t_gh);
	if (error)
		goto fail_holder_uninit;

	error = gfs2_log_reserve(sdp, tr->tr_reserved);
	if (error)
		goto fail_gunlock;

	current->journal_info = tr;

	return 0;

fail_gunlock:
	gfs2_glock_dq(&tr->tr_t_gh);

fail_holder_uninit:
	sb_end_intwrite(sdp->sd_vfs);
	gfs2_holder_uninit(&tr->tr_t_gh);
	kfree(tr);

	return error;
}

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

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

	atomic_add(blks, &sdp->sd_log_blks_free);
	trace_gfs2_log_blocks(sdp, blks);
	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
				  sdp->sd_jdesc->jd_blocks);
	up_read(&sdp->sd_log_flush_lock);
}

static void gfs2_print_trans(const struct gfs2_trans *tr)
{
	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
	       tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
	printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
	       tr->tr_num_buf_new, tr->tr_num_buf_rm,
	       tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
	       tr->tr_num_revoke, tr->tr_num_revoke_rm);
}

void gfs2_trans_end(struct gfs2_sbd *sdp)
{
	struct gfs2_trans *tr = current->journal_info;
	s64 nbuf;
	BUG_ON(!tr);
	current->journal_info = NULL;

	if (!tr->tr_touched) {
		gfs2_log_release(sdp, tr->tr_reserved);
		if (tr->tr_t_gh.gh_gl) {
			gfs2_glock_dq(&tr->tr_t_gh);
			gfs2_holder_uninit(&tr->tr_t_gh);
			kfree(tr);
		}
		sb_end_intwrite(sdp->sd_vfs);
		return;
	}

	nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
	nbuf -= tr->tr_num_buf_rm;
	nbuf -= tr->tr_num_databuf_rm;

	if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
				       (tr->tr_num_revoke <= tr->tr_revokes)))
		gfs2_print_trans(tr);

	gfs2_log_commit(sdp, tr);
	if (tr->tr_t_gh.gh_gl) {
		gfs2_glock_dq(&tr->tr_t_gh);
		gfs2_holder_uninit(&tr->tr_t_gh);
		kfree(tr);
	}

	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
		gfs2_log_flush(sdp, NULL);
	sb_end_intwrite(sdp->sd_vfs);
}

static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
					       struct buffer_head *bh,
					       const struct gfs2_log_operations *lops)
{
	struct gfs2_bufdata *bd;

	bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
	bd->bd_bh = bh;
	bd->bd_gl = gl;
	bd->bd_ops = lops;
	INIT_LIST_HEAD(&bd->bd_list);
	bh->b_private = bd;
	return bd;
}

/**
 * databuf_lo_add - Add a databuf to the transaction.
 *
 * This is used in two distinct cases:
 * i) In ordered write mode
 *    We put the data buffer on a list so that we can ensure that its
 *    synced to disk at the right time
 * ii) In journaled data mode
 *    We need to journal the data block in the same way as metadata in
 *    the functions above. The difference is that here we have a tag
 *    which is two __be64's being the block number (as per meta data)
 *    and a flag which says whether the data block needs escaping or
 *    not. This means we need a new log entry for each 251 or so data
 *    blocks, which isn't an enormous overhead but twice as much as
 *    for normal metadata blocks.
 */
static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
	struct gfs2_trans *tr = current->journal_info;
	struct address_space *mapping = bd->bd_bh->b_page->mapping;
	struct gfs2_inode *ip = GFS2_I(mapping->host);

	if (tr)
		tr->tr_touched = 1;
	if (!list_empty(&bd->bd_list))
		return;
	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
	if (gfs2_is_jdata(ip)) {
		gfs2_pin(sdp, bd->bd_bh);
		tr->tr_num_databuf_new++;
		sdp->sd_log_num_databuf++;
		list_add_tail(&bd->bd_list, &sdp->sd_log_le_databuf);
	} else {
		list_add_tail(&bd->bd_list, &sdp->sd_log_le_ordered);
	}
}

void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
{

	struct gfs2_sbd *sdp = gl->gl_sbd;
	struct gfs2_bufdata *bd;

	lock_buffer(bh);
	gfs2_log_lock(sdp);
	bd = bh->b_private;
	if (bd == NULL) {
		gfs2_log_unlock(sdp);
		unlock_buffer(bh);
		if (bh->b_private == NULL)
			bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
		lock_buffer(bh);
		gfs2_log_lock(sdp);
	}
	gfs2_assert(sdp, bd->bd_gl == gl);
	databuf_lo_add(sdp, bd);
	gfs2_log_unlock(sdp);
	unlock_buffer(bh);
}

static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
	struct gfs2_meta_header *mh;
	struct gfs2_trans *tr;

	tr = current->journal_info;
	tr->tr_touched = 1;
	if (!list_empty(&bd->bd_list))
		return;
	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
	mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
	if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
		printk(KERN_ERR
		       "Attempting to add uninitialised block to journal (inplace block=%lld)\n",
		       (unsigned long long)bd->bd_bh->b_blocknr);
		BUG();
	}
	gfs2_pin(sdp, bd->bd_bh);
	mh->__pad0 = cpu_to_be64(0);
	mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
	sdp->sd_log_num_buf++;
	list_add(&bd->bd_list, &sdp->sd_log_le_buf);
	tr->tr_num_buf_new++;
}

void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
{

	struct gfs2_sbd *sdp = gl->gl_sbd;
	struct gfs2_bufdata *bd;

	lock_buffer(bh);
	gfs2_log_lock(sdp);
	bd = bh->b_private;
	if (bd == NULL) {
		gfs2_log_unlock(sdp);
		unlock_buffer(bh);
		lock_page(bh->b_page);
		if (bh->b_private == NULL)
			bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
		unlock_page(bh->b_page);
		lock_buffer(bh);
		gfs2_log_lock(sdp);
	}
	gfs2_assert(sdp, bd->bd_gl == gl);
	meta_lo_add(sdp, bd);
	gfs2_log_unlock(sdp);
	unlock_buffer(bh);
}

void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
	struct gfs2_glock *gl = bd->bd_gl;
	struct gfs2_trans *tr = current->journal_info;

	BUG_ON(!list_empty(&bd->bd_list));
	BUG_ON(!list_empty(&bd->bd_ail_st_list));
	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
	bd->bd_ops = &gfs2_revoke_lops;
	tr->tr_touched = 1;
	tr->tr_num_revoke++;
	sdp->sd_log_num_revoke++;
	atomic_inc(&gl->gl_revokes);
	set_bit(GLF_LFLUSH, &gl->gl_flags);
	list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
}

void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
{
	struct gfs2_bufdata *bd, *tmp;
	struct gfs2_trans *tr = current->journal_info;
	unsigned int n = len;

	gfs2_log_lock(sdp);
	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
		if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
			list_del_init(&bd->bd_list);
			gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
			sdp->sd_log_num_revoke--;
			kmem_cache_free(gfs2_bufdata_cachep, bd);
			tr->tr_num_revoke_rm++;
			if (--n == 0)
				break;
		}
	}
	gfs2_log_unlock(sdp);
}
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>
d0dc80db	15	#include <linux/kallsyms.h>
f057f6cd	16	#include <linux/gfs2_ondisk.h>
b3b94faa DT	17
b3b94faa DT	18	#include "gfs2.h"
5c676f6d	19	#include "incore.h"
b3b94faa	20	#include "glock.h"
767f433f	21	#include "inode.h"
b3b94faa DT	22	#include "log.h"
	23	#include "lops.h"
	24	#include "meta_io.h"
	25	#include "trans.h"
5c676f6d	26	#include "util.h"
5e687eac	27	#include "trace_gfs2.h"
b3b94faa	28
d0dc80db SW	29	int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
d0dc80db SW	30	unsigned int revokes)
b3b94faa DT	31	{
	32	struct gfs2_trans *tr;
	33	int error;
	34
d0dc80db SW	35	BUG_ON(current->journal_info);
d0dc80db SW	36	BUG_ON(blocks == 0 && revokes == 0);
b3b94faa	37
a1c0643f SW	38	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
	39	return -EROFS;
	40
f55ab26a	41	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
b3b94faa DT	42	if (!tr)
	43	return -ENOMEM;
	44
d0dc80db	45	tr->tr_ip = (unsigned long)__builtin_return_address(0);
b3b94faa DT	46	tr->tr_blocks = blocks;
	47	tr->tr_revokes = revokes;
	48	tr->tr_reserved = 1;
	49	if (blocks)
f4154ea0	50	tr->tr_reserved += 6 + blocks;
b3b94faa DT	51	if (revokes)
b3b94faa DT	52	tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
cd915493	53	sizeof(u64));
39263d5e	54	sb_start_intwrite(sdp->sd_vfs);
579b78a4	55	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
b3b94faa	56
e317ffcb	57	error = gfs2_glock_nq(&tr->tr_t_gh);
b3b94faa	58	if (error)
e317ffcb	59	goto fail_holder_uninit;
b3b94faa	60
b3b94faa DT	61	error = gfs2_log_reserve(sdp, tr->tr_reserved);
	62	if (error)
	63	goto fail_gunlock;
	64
5c676f6d	65	current->journal_info = tr;
b3b94faa DT	66
	67	return 0;
	68
484adff8	69	fail_gunlock:
e317ffcb	70	gfs2_glock_dq(&tr->tr_t_gh);
b3b94faa	71
484adff8	72	fail_holder_uninit:
39263d5e	73	sb_end_intwrite(sdp->sd_vfs);
e317ffcb	74	gfs2_holder_uninit(&tr->tr_t_gh);
b3b94faa DT	75	kfree(tr);
	76
	77	return error;
	78	}
	79
5e687eac BM	80	/**
	81	* gfs2_log_release - Release a given number of log blocks
	82	* @sdp: The GFS2 superblock
	83	* @blks: The number of blocks
	84	*
	85	*/
	86
	87	static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
	88	{
	89
	90	atomic_add(blks, &sdp->sd_log_blks_free);
	91	trace_gfs2_log_blocks(sdp, blks);
	92	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
	93	sdp->sd_jdesc->jd_blocks);
	94	up_read(&sdp->sd_log_flush_lock);
	95	}
	96
c50b91c4 SW	97	static void gfs2_print_trans(const struct gfs2_trans *tr)
	98	{
	99	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	100	printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
	101	tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
	102	printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
	103	tr->tr_num_buf_new, tr->tr_num_buf_rm,
	104	tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
	105	tr->tr_num_revoke, tr->tr_num_revoke_rm);
	106	}
	107
b3b94faa DT	108	void gfs2_trans_end(struct gfs2_sbd *sdp)
b3b94faa DT	109	{
f4154ea0	110	struct gfs2_trans *tr = current->journal_info;
c50b91c4	111	s64 nbuf;
f4154ea0	112	BUG_ON(!tr);
5c676f6d	113	current->journal_info = NULL;
b3b94faa	114
b3b94faa DT	115	if (!tr->tr_touched) {
b3b94faa DT	116	gfs2_log_release(sdp, tr->tr_reserved);
d8348de0 SW	117	if (tr->tr_t_gh.gh_gl) {
	118	gfs2_glock_dq(&tr->tr_t_gh);
	119	gfs2_holder_uninit(&tr->tr_t_gh);
	120	kfree(tr);
	121	}
39263d5e	122	sb_end_intwrite(sdp->sd_vfs);
b3b94faa DT	123	return;
	124	}
	125
c50b91c4 SW	126	nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
	127	nbuf -= tr->tr_num_buf_rm;
	128	nbuf -= tr->tr_num_databuf_rm;
	129
	130	if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
	131	(tr->tr_num_revoke <= tr->tr_revokes)))
	132	gfs2_print_trans(tr);
b3b94faa DT	133
b3b94faa DT	134	gfs2_log_commit(sdp, tr);
d8348de0 SW	135	if (tr->tr_t_gh.gh_gl) {
	136	gfs2_glock_dq(&tr->tr_t_gh);
	137	gfs2_holder_uninit(&tr->tr_t_gh);
	138	kfree(tr);
	139	}
b3b94faa DT	140
b3b94faa DT	141	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
b09e593d	142	gfs2_log_flush(sdp, NULL);
39263d5e	143	sb_end_intwrite(sdp->sd_vfs);
b3b94faa DT	144	}
b3b94faa DT	145
c76c4d96 SW	146	static struct gfs2_bufdata gfs2_alloc_bufdata(struct gfs2_glock gl,
	147	struct buffer_head *bh,
	148	const struct gfs2_log_operations *lops)
	149	{
	150	struct gfs2_bufdata *bd;
	151
	152	bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS \| __GFP_NOFAIL);
	153	bd->bd_bh = bh;
	154	bd->bd_gl = gl;
	155	bd->bd_ops = lops;
	156	INIT_LIST_HEAD(&bd->bd_list);
	157	bh->b_private = bd;
	158	return bd;
	159	}
	160
b3b94faa	161	/**
767f433f	162	* databuf_lo_add - Add a databuf to the transaction.
b3b94faa	163	*
767f433f SW	164	* This is used in two distinct cases:
	165	* i) In ordered write mode
	166	* We put the data buffer on a list so that we can ensure that its
	167	* synced to disk at the right time
	168	* ii) In journaled data mode
	169	* We need to journal the data block in the same way as metadata in
	170	* the functions above. The difference is that here we have a tag
	171	* which is two __be64's being the block number (as per meta data)
	172	* and a flag which says whether the data block needs escaping or
	173	* not. This means we need a new log entry for each 251 or so data
	174	* blocks, which isn't an enormous overhead but twice as much as
	175	* for normal metadata blocks.
b3b94faa	176	*/
767f433f SW	177	static void databuf_lo_add(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
	178	{
	179	struct gfs2_trans *tr = current->journal_info;
	180	struct address_space *mapping = bd->bd_bh->b_page->mapping;
	181	struct gfs2_inode *ip = GFS2_I(mapping->host);
	182
	183	if (tr)
	184	tr->tr_touched = 1;
	185	if (!list_empty(&bd->bd_list))
	186	return;
	187	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
	188	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
	189	if (gfs2_is_jdata(ip)) {
	190	gfs2_pin(sdp, bd->bd_bh);
	191	tr->tr_num_databuf_new++;
	192	sdp->sd_log_num_databuf++;
	193	list_add_tail(&bd->bd_list, &sdp->sd_log_le_databuf);
	194	} else {
	195	list_add_tail(&bd->bd_list, &sdp->sd_log_le_ordered);
	196	}
	197	}
b3b94faa	198
767f433f	199	void gfs2_trans_add_data(struct gfs2_glock gl, struct buffer_head bh)
b3b94faa	200	{
767f433f	201
b3b94faa DT	202	struct gfs2_sbd *sdp = gl->gl_sbd;
	203	struct gfs2_bufdata *bd;
	204
96e5d1d3 BM	205	lock_buffer(bh);
96e5d1d3 BM	206	gfs2_log_lock(sdp);
5c676f6d	207	bd = bh->b_private;
c76c4d96	208	if (bd == NULL) {
96e5d1d3 BM	209	gfs2_log_unlock(sdp);
96e5d1d3 BM	210	unlock_buffer(bh);
c76c4d96 SW	211	if (bh->b_private == NULL)
c76c4d96 SW	212	bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
96e5d1d3 BM	213	lock_buffer(bh);
96e5d1d3 BM	214	gfs2_log_lock(sdp);
b3b94faa	215	}
c76c4d96	216	gfs2_assert(sdp, bd->bd_gl == gl);
767f433f	217	databuf_lo_add(sdp, bd);
96e5d1d3 BM	218	gfs2_log_unlock(sdp);
96e5d1d3 BM	219	unlock_buffer(bh);
b3b94faa DT	220	}
b3b94faa DT	221
767f433f	222	static void meta_lo_add(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
350a9b0a	223	{
767f433f SW	224	struct gfs2_meta_header *mh;
	225	struct gfs2_trans *tr;
	226
	227	tr = current->journal_info;
	228	tr->tr_touched = 1;
	229	if (!list_empty(&bd->bd_list))
	230	return;
	231	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
	232	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
	233	mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
	234	if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
	235	printk(KERN_ERR
	236	"Attempting to add uninitialised block to journal (inplace block=%lld)\n",
	237	(unsigned long long)bd->bd_bh->b_blocknr);
	238	BUG();
	239	}
	240	gfs2_pin(sdp, bd->bd_bh);
	241	mh->__pad0 = cpu_to_be64(0);
	242	mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
	243	sdp->sd_log_num_buf++;
	244	list_add(&bd->bd_list, &sdp->sd_log_le_buf);
	245	tr->tr_num_buf_new++;
350a9b0a SW	246	}
	247
	248	void gfs2_trans_add_meta(struct gfs2_glock gl, struct buffer_head bh)
	249	{
767f433f SW	250
	251	struct gfs2_sbd *sdp = gl->gl_sbd;
	252	struct gfs2_bufdata *bd;
	253
	254	lock_buffer(bh);
	255	gfs2_log_lock(sdp);
	256	bd = bh->b_private;
c76c4d96	257	if (bd == NULL) {
767f433f SW	258	gfs2_log_unlock(sdp);
767f433f SW	259	unlock_buffer(bh);
c76c4d96 SW	260	lock_page(bh->b_page);
	261	if (bh->b_private == NULL)
	262	bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
	263	unlock_page(bh->b_page);
767f433f SW	264	lock_buffer(bh);
	265	gfs2_log_lock(sdp);
	266	}
c76c4d96	267	gfs2_assert(sdp, bd->bd_gl == gl);
767f433f SW	268	meta_lo_add(sdp, bd);
	269	gfs2_log_unlock(sdp);
	270	unlock_buffer(bh);
350a9b0a SW	271	}
350a9b0a SW	272
1ad38c43	273	void gfs2_trans_add_revoke(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
b3b94faa	274	{
75f2b879 SW	275	struct gfs2_glock *gl = bd->bd_gl;
	276	struct gfs2_trans *tr = current->journal_info;
	277
c0752aa7	278	BUG_ON(!list_empty(&bd->bd_list));
1ad38c43 SW	279	BUG_ON(!list_empty(&bd->bd_ail_st_list));
1ad38c43 SW	280	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
c76c4d96	281	bd->bd_ops = &gfs2_revoke_lops;
75f2b879 SW	282	tr->tr_touched = 1;
	283	tr->tr_num_revoke++;
	284	sdp->sd_log_num_revoke++;
	285	atomic_inc(&gl->gl_revokes);
	286	set_bit(GLF_LFLUSH, &gl->gl_flags);
	287	list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
b3b94faa DT	288	}
b3b94faa DT	289
5731be53	290	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
b3b94faa	291	{
5731be53 SW	292	struct gfs2_bufdata bd, tmp;
	293	struct gfs2_trans *tr = current->journal_info;
	294	unsigned int n = len;
b3b94faa DT	295
b3b94faa DT	296	gfs2_log_lock(sdp);
c0752aa7	297	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
5731be53	298	if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
c0752aa7	299	list_del_init(&bd->bd_list);
b3b94faa DT	300	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
b3b94faa DT	301	sdp->sd_log_num_revoke--;
5731be53 SW	302	kmem_cache_free(gfs2_bufdata_cachep, bd);
	303	tr->tr_num_revoke_rm++;
	304	if (--n == 0)
	305	break;
b3b94faa DT	306	}
b3b94faa DT	307	}
b3b94faa	308	gfs2_log_unlock(sdp);
b3b94faa DT	309	}
b3b94faa DT	310