[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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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 = _RET_IP_;
	tr->tr_blocks = blocks;
	tr->tr_revokes = revokes;
	tr->tr_reserved = 1;
	set_bit(TR_ALLOCED, &tr->tr_flags);
	if (blocks)
		tr->tr_reserved += 6 + blocks;
	if (revokes)
		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
						   sizeof(u64));
	INIT_LIST_HEAD(&tr->tr_databuf);
	INIT_LIST_HEAD(&tr->tr_buf);

	sb_start_intwrite(sdp->sd_vfs);

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

	current->journal_info = tr;

	return 0;

fail:
	sb_end_intwrite(sdp->sd_vfs);
	kfree(tr);

	return error;
}

static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
{
	fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
	fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
		tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
		test_bit(TR_TOUCHED, &tr->tr_flags));
	fs_warn(sdp, "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;
	int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);

	current->journal_info = NULL;

	if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
		gfs2_log_release(sdp, tr->tr_reserved);
		if (alloced) {
			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(sdp, tr);

	gfs2_log_commit(sdp, tr);
	if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
		kfree(tr);
	up_read(&sdp->sd_log_flush_lock);

	if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
		gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
			       GFS2_LFC_TRANS_END);
	if (alloced)
		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;
}

/**
 * gfs2_trans_add_data - Add a databuf to the transaction.
 * @gl: The inode glock associated with the buffer
 * @bh: The buffer to add
 *
 * This is used 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.
 */
void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
{
	struct gfs2_trans *tr = current->journal_info;
	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
	struct gfs2_bufdata *bd;

	lock_buffer(bh);
	if (buffer_pinned(bh)) {
		set_bit(TR_TOUCHED, &tr->tr_flags);
		goto out;
	}
	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);
		else
			bd = bh->b_private;
		lock_buffer(bh);
		gfs2_log_lock(sdp);
	}
	gfs2_assert(sdp, bd->bd_gl == gl);
	set_bit(TR_TOUCHED, &tr->tr_flags);
	if (list_empty(&bd->bd_list)) {
		set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
		set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
		gfs2_pin(sdp, bd->bd_bh);
		tr->tr_num_databuf_new++;
		list_add_tail(&bd->bd_list, &tr->tr_databuf);
	}
	gfs2_log_unlock(sdp);
out:
	unlock_buffer(bh);
}

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

	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
	struct gfs2_bufdata *bd;
	struct gfs2_meta_header *mh;
	struct gfs2_trans *tr = current->journal_info;
	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);

	lock_buffer(bh);
	if (buffer_pinned(bh)) {
		set_bit(TR_TOUCHED, &tr->tr_flags);
		goto out;
	}
	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);
		else
			bd = bh->b_private;
		unlock_page(bh->b_page);
		lock_buffer(bh);
		gfs2_log_lock(sdp);
	}
	gfs2_assert(sdp, bd->bd_gl == gl);
	set_bit(TR_TOUCHED, &tr->tr_flags);
	if (!list_empty(&bd->bd_list))
		goto out_unlock;
	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))) {
		fs_err(sdp, "Attempting to add uninitialised block to "
		       "journal (inplace block=%lld)\n",
		       (unsigned long long)bd->bd_bh->b_blocknr);
		BUG();
	}
	if (unlikely(state == SFS_FROZEN)) {
		fs_info(sdp, "GFS2:adding buf while frozen\n");
		gfs2_assert_withdraw(sdp, 0);
	}
	gfs2_pin(sdp, bd->bd_bh);
	mh->__pad0 = cpu_to_be64(0);
	mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
	list_add(&bd->bd_list, &tr->tr_buf);
	tr->tr_num_buf_new++;
out_unlock:
	gfs2_log_unlock(sdp);
out:
	unlock_buffer(bh);
}

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

	BUG_ON(!list_empty(&bd->bd_list));
	gfs2_add_revoke(sdp, bd);
	set_bit(TR_TOUCHED, &tr->tr_flags);
	tr->tr_num_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	*/
b3b94faa DT	9
d77d1b58 JP	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
d77d1b58 JP	11
b3b94faa DT	12	#include <linux/sched.h>
	13	#include <linux/slab.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/completion.h>
	16	#include <linux/buffer_head.h>
d0dc80db	17	#include <linux/kallsyms.h>
f057f6cd	18	#include <linux/gfs2_ondisk.h>
b3b94faa DT	19
b3b94faa DT	20	#include "gfs2.h"
5c676f6d	21	#include "incore.h"
b3b94faa	22	#include "glock.h"
767f433f	23	#include "inode.h"
b3b94faa DT	24	#include "log.h"
	25	#include "lops.h"
	26	#include "meta_io.h"
	27	#include "trans.h"
5c676f6d	28	#include "util.h"
5e687eac	29	#include "trace_gfs2.h"
b3b94faa	30
d0dc80db SW	31	int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
d0dc80db SW	32	unsigned int revokes)
b3b94faa DT	33	{
	34	struct gfs2_trans *tr;
	35	int error;
	36
d0dc80db SW	37	BUG_ON(current->journal_info);
d0dc80db SW	38	BUG_ON(blocks == 0 && revokes == 0);
b3b94faa	39
a1c0643f SW	40	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
	41	return -EROFS;
	42
f55ab26a	43	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
b3b94faa DT	44	if (!tr)
	45	return -ENOMEM;
	46
d29c0afe	47	tr->tr_ip = _RET_IP_;
b3b94faa DT	48	tr->tr_blocks = blocks;
	49	tr->tr_revokes = revokes;
	50	tr->tr_reserved = 1;
9862ca05	51	set_bit(TR_ALLOCED, &tr->tr_flags);
b3b94faa	52	if (blocks)
f4154ea0	53	tr->tr_reserved += 6 + blocks;
b3b94faa DT	54	if (revokes)
b3b94faa DT	55	tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
cd915493	56	sizeof(u64));
d69a3c65 SW	57	INIT_LIST_HEAD(&tr->tr_databuf);
	58	INIT_LIST_HEAD(&tr->tr_buf);
	59
39263d5e	60	sb_start_intwrite(sdp->sd_vfs);
b3b94faa	61
b3b94faa DT	62	error = gfs2_log_reserve(sdp, tr->tr_reserved);
b3b94faa DT	63	if (error)
24972557	64	goto fail;
b3b94faa	65
5c676f6d	66	current->journal_info = tr;
b3b94faa DT	67
	68	return 0;
	69
24972557	70	fail:
39263d5e	71	sb_end_intwrite(sdp->sd_vfs);
b3b94faa DT	72	kfree(tr);
	73
	74	return error;
	75	}
	76
e54c78a2	77	static void gfs2_print_trans(struct gfs2_sbd sdp, const struct gfs2_trans tr)
c50b91c4	78	{
e54c78a2 BP	79	fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
e54c78a2 BP	80	fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
9862ca05 BP	81	tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
9862ca05 BP	82	test_bit(TR_TOUCHED, &tr->tr_flags));
e54c78a2	83	fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
d77d1b58 JP	84	tr->tr_num_buf_new, tr->tr_num_buf_rm,
	85	tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
	86	tr->tr_num_revoke, tr->tr_num_revoke_rm);
c50b91c4 SW	87	}
c50b91c4 SW	88
b3b94faa DT	89	void gfs2_trans_end(struct gfs2_sbd *sdp)
b3b94faa DT	90	{
f4154ea0	91	struct gfs2_trans *tr = current->journal_info;
c50b91c4	92	s64 nbuf;
9862ca05	93	int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
2e60d768	94
5c676f6d	95	current->journal_info = NULL;
b3b94faa	96
9862ca05	97	if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
b3b94faa	98	gfs2_log_release(sdp, tr->tr_reserved);
2e60d768	99	if (alloced) {
d8348de0	100	kfree(tr);
2e60d768 BM	101	sb_end_intwrite(sdp->sd_vfs);
2e60d768 BM	102	}
b3b94faa DT	103	return;
	104	}
	105
c50b91c4 SW	106	nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
	107	nbuf -= tr->tr_num_buf_rm;
	108	nbuf -= tr->tr_num_databuf_rm;
	109
	110	if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
	111	(tr->tr_num_revoke <= tr->tr_revokes)))
e54c78a2	112	gfs2_print_trans(sdp, tr);
b3b94faa DT	113
b3b94faa DT	114	gfs2_log_commit(sdp, tr);
9862ca05 BP	115	if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
9862ca05 BP	116	kfree(tr);
16ca9412	117	up_read(&sdp->sd_log_flush_lock);
b3b94faa	118
1751e8a6	119	if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
805c0907 BP	120	gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL \|
805c0907 BP	121	GFS2_LFC_TRANS_END);
2e60d768 BM	122	if (alloced)
2e60d768 BM	123	sb_end_intwrite(sdp->sd_vfs);
b3b94faa DT	124	}
b3b94faa DT	125
c76c4d96 SW	126	static struct gfs2_bufdata gfs2_alloc_bufdata(struct gfs2_glock gl,
	127	struct buffer_head *bh,
	128	const struct gfs2_log_operations *lops)
	129	{
	130	struct gfs2_bufdata *bd;
	131
	132	bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS \| __GFP_NOFAIL);
	133	bd->bd_bh = bh;
	134	bd->bd_gl = gl;
	135	bd->bd_ops = lops;
	136	INIT_LIST_HEAD(&bd->bd_list);
	137	bh->b_private = bd;
	138	return bd;
	139	}
	140
b3b94faa	141	/**
45138990 SW	142	* gfs2_trans_add_data - Add a databuf to the transaction.
	143	* @gl: The inode glock associated with the buffer
	144	* @bh: The buffer to add
b3b94faa	145	*
845802b1 AG	146	* This is used in journaled data mode.
	147	* We need to journal the data block in the same way as metadata in
	148	* the functions above. The difference is that here we have a tag
	149	* which is two __be64's being the block number (as per meta data)
	150	* and a flag which says whether the data block needs escaping or
	151	* not. This means we need a new log entry for each 251 or so data
	152	* blocks, which isn't an enormous overhead but twice as much as
	153	* for normal metadata blocks.
b3b94faa	154	*/
45138990	155	void gfs2_trans_add_data(struct gfs2_glock gl, struct buffer_head bh)
767f433f SW	156	{
767f433f SW	157	struct gfs2_trans *tr = current->journal_info;
15562c43	158	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
45138990	159	struct gfs2_bufdata *bd;
767f433f	160
96e5d1d3	161	lock_buffer(bh);
aacee720 BP	162	if (buffer_pinned(bh)) {
	163	set_bit(TR_TOUCHED, &tr->tr_flags);
	164	goto out;
	165	}
96e5d1d3	166	gfs2_log_lock(sdp);
5c676f6d	167	bd = bh->b_private;
c76c4d96	168	if (bd == NULL) {
96e5d1d3 BM	169	gfs2_log_unlock(sdp);
96e5d1d3 BM	170	unlock_buffer(bh);
c76c4d96 SW	171	if (bh->b_private == NULL)
c76c4d96 SW	172	bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
491e94f7 BP	173	else
491e94f7 BP	174	bd = bh->b_private;
96e5d1d3 BM	175	lock_buffer(bh);
96e5d1d3 BM	176	gfs2_log_lock(sdp);
b3b94faa	177	}
c76c4d96	178	gfs2_assert(sdp, bd->bd_gl == gl);
9862ca05	179	set_bit(TR_TOUCHED, &tr->tr_flags);
45138990 SW	180	if (list_empty(&bd->bd_list)) {
	181	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
	182	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
	183	gfs2_pin(sdp, bd->bd_bh);
	184	tr->tr_num_databuf_new++;
d69a3c65	185	list_add_tail(&bd->bd_list, &tr->tr_databuf);
45138990	186	}
96e5d1d3	187	gfs2_log_unlock(sdp);
aacee720	188	out:
96e5d1d3	189	unlock_buffer(bh);
b3b94faa DT	190	}
b3b94faa DT	191
192738b7	192	void gfs2_trans_add_meta(struct gfs2_glock gl, struct buffer_head bh)
350a9b0a	193	{
192738b7 BP	194
	195	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
	196	struct gfs2_bufdata *bd;
767f433f	197	struct gfs2_meta_header *mh;
aacee720	198	struct gfs2_trans *tr = current->journal_info;
2e60d768	199	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
767f433f	200
192738b7	201	lock_buffer(bh);
aacee720 BP	202	if (buffer_pinned(bh)) {
	203	set_bit(TR_TOUCHED, &tr->tr_flags);
	204	goto out;
	205	}
192738b7 BP	206	gfs2_log_lock(sdp);
	207	bd = bh->b_private;
	208	if (bd == NULL) {
	209	gfs2_log_unlock(sdp);
	210	unlock_buffer(bh);
	211	lock_page(bh->b_page);
	212	if (bh->b_private == NULL)
	213	bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
	214	else
	215	bd = bh->b_private;
	216	unlock_page(bh->b_page);
	217	lock_buffer(bh);
	218	gfs2_log_lock(sdp);
	219	}
	220	gfs2_assert(sdp, bd->bd_gl == gl);
9862ca05	221	set_bit(TR_TOUCHED, &tr->tr_flags);
767f433f	222	if (!list_empty(&bd->bd_list))
192738b7	223	goto out_unlock;
767f433f SW	224	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
	225	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
	226	mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
	227	if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
e54c78a2 BP	228	fs_err(sdp, "Attempting to add uninitialised block to "
e54c78a2 BP	229	"journal (inplace block=%lld)\n",
767f433f SW	230	(unsigned long long)bd->bd_bh->b_blocknr);
	231	BUG();
	232	}
2e60d768	233	if (unlikely(state == SFS_FROZEN)) {
e54c78a2	234	fs_info(sdp, "GFS2:adding buf while frozen\n");
2e60d768 BM	235	gfs2_assert_withdraw(sdp, 0);
2e60d768 BM	236	}
767f433f SW	237	gfs2_pin(sdp, bd->bd_bh);
	238	mh->__pad0 = cpu_to_be64(0);
	239	mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
d69a3c65	240	list_add(&bd->bd_list, &tr->tr_buf);
767f433f	241	tr->tr_num_buf_new++;
192738b7	242	out_unlock:
767f433f	243	gfs2_log_unlock(sdp);
aacee720	244	out:
767f433f	245	unlock_buffer(bh);
350a9b0a SW	246	}
350a9b0a SW	247
1ad38c43	248	void gfs2_trans_add_revoke(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
b3b94faa	249	{
75f2b879 SW	250	struct gfs2_trans *tr = current->journal_info;
75f2b879 SW	251
c0752aa7	252	BUG_ON(!list_empty(&bd->bd_list));
5d054964	253	gfs2_add_revoke(sdp, bd);
9862ca05	254	set_bit(TR_TOUCHED, &tr->tr_flags);
75f2b879	255	tr->tr_num_revoke++;
b3b94faa DT	256	}
b3b94faa DT	257
5731be53	258	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
b3b94faa	259	{
5731be53 SW	260	struct gfs2_bufdata bd, tmp;
	261	struct gfs2_trans *tr = current->journal_info;
	262	unsigned int n = len;
b3b94faa DT	263
b3b94faa DT	264	gfs2_log_lock(sdp);
c0752aa7	265	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
5731be53	266	if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
c0752aa7	267	list_del_init(&bd->bd_list);
b3b94faa DT	268	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
b3b94faa DT	269	sdp->sd_log_num_revoke--;
5731be53 SW	270	kmem_cache_free(gfs2_bufdata_cachep, bd);
	271	tr->tr_num_revoke_rm++;
	272	if (--n == 0)
	273	break;
b3b94faa DT	274	}
b3b94faa DT	275	}
b3b94faa	276	gfs2_log_unlock(sdp);
b3b94faa DT	277	}
b3b94faa DT	278