[net-next-2.6.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 "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));
	INIT_LIST_HEAD(&tr->tr_list_buf);

	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:
	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);
}

void gfs2_trans_end(struct gfs2_sbd *sdp)
{
	struct gfs2_trans *tr = current->journal_info;

	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);
		}
		return;
	}

	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
		fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
		       tr->tr_num_buf, tr->tr_blocks);
		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	}
	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
		fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
		       tr->tr_num_revoke, tr->tr_revokes);
		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	}

	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);
}

/**
 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 * @gl: the glock the buffer belongs to
 * @bh: The buffer to add
 * @meta: True in the case of adding metadata
 *
 */

void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;
	struct gfs2_bufdata *bd;

	bd = bh->b_private;
	if (bd)
		gfs2_assert(sdp, bd->bd_gl == gl);
	else {
		gfs2_attach_bufdata(gl, bh, meta);
		bd = bh->b_private;
	}
	lops_add(sdp, &bd->bd_le);
}

void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
	BUG_ON(!list_empty(&bd->bd_le.le_list));
	BUG_ON(!list_empty(&bd->bd_ail_st_list));
	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
	lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
	lops_add(sdp, &bd->bd_le);
}

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_le.le_list) {
		if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
			list_del_init(&bd->bd_le.le_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);
}

void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
{
	lops_add(rgd->rd_sbd, &rgd->rd_le);
}
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 DT	20	#include "glock.h"
	21	#include "log.h"
	22	#include "lops.h"
	23	#include "meta_io.h"
	24	#include "trans.h"
5c676f6d	25	#include "util.h"
5e687eac	26	#include "trace_gfs2.h"
b3b94faa	27
d0dc80db SW	28	int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
d0dc80db SW	29	unsigned int revokes)
b3b94faa DT	30	{
	31	struct gfs2_trans *tr;
	32	int error;
	33
d0dc80db SW	34	BUG_ON(current->journal_info);
d0dc80db SW	35	BUG_ON(blocks == 0 && revokes == 0);
b3b94faa	36
a1c0643f SW	37	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
	38	return -EROFS;
	39
f55ab26a	40	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
b3b94faa DT	41	if (!tr)
	42	return -ENOMEM;
	43
d0dc80db	44	tr->tr_ip = (unsigned long)__builtin_return_address(0);
b3b94faa DT	45	tr->tr_blocks = blocks;
	46	tr->tr_revokes = revokes;
	47	tr->tr_reserved = 1;
	48	if (blocks)
f4154ea0	49	tr->tr_reserved += 6 + blocks;
b3b94faa DT	50	if (revokes)
b3b94faa DT	51	tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
cd915493	52	sizeof(u64));
b3b94faa DT	53	INIT_LIST_HEAD(&tr->tr_list_buf);
b3b94faa DT	54
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:
e317ffcb	73	gfs2_holder_uninit(&tr->tr_t_gh);
b3b94faa DT	74	kfree(tr);
	75
	76	return error;
	77	}
	78
5e687eac BM	79	/**
	80	* gfs2_log_release - Release a given number of log blocks
	81	* @sdp: The GFS2 superblock
	82	* @blks: The number of blocks
	83	*
	84	*/
	85
	86	static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
	87	{
	88
	89	atomic_add(blks, &sdp->sd_log_blks_free);
	90	trace_gfs2_log_blocks(sdp, blks);
	91	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
	92	sdp->sd_jdesc->jd_blocks);
	93	up_read(&sdp->sd_log_flush_lock);
	94	}
	95
b3b94faa DT	96	void gfs2_trans_end(struct gfs2_sbd *sdp)
b3b94faa DT	97	{
f4154ea0	98	struct gfs2_trans *tr = current->journal_info;
b3b94faa	99
f4154ea0	100	BUG_ON(!tr);
5c676f6d	101	current->journal_info = NULL;
b3b94faa	102
b3b94faa DT	103	if (!tr->tr_touched) {
b3b94faa DT	104	gfs2_log_release(sdp, tr->tr_reserved);
d8348de0 SW	105	if (tr->tr_t_gh.gh_gl) {
	106	gfs2_glock_dq(&tr->tr_t_gh);
	107	gfs2_holder_uninit(&tr->tr_t_gh);
	108	kfree(tr);
	109	}
b3b94faa DT	110	return;
	111	}
	112
d0dc80db SW	113	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
	114	fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
	115	tr->tr_num_buf, tr->tr_blocks);
	116	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	117	}
cd45697f	118	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
d0dc80db SW	119	fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
	120	tr->tr_num_revoke, tr->tr_revokes);
	121	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
cd45697f	122	}
b3b94faa DT	123
b3b94faa DT	124	gfs2_log_commit(sdp, tr);
d8348de0 SW	125	if (tr->tr_t_gh.gh_gl) {
	126	gfs2_glock_dq(&tr->tr_t_gh);
	127	gfs2_holder_uninit(&tr->tr_t_gh);
	128	kfree(tr);
	129	}
b3b94faa DT	130
b3b94faa DT	131	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
b09e593d	132	gfs2_log_flush(sdp, NULL);
b3b94faa DT	133	}
b3b94faa DT	134
b3b94faa DT	135	/**
	136	* gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
	137	* @gl: the glock the buffer belongs to
	138	* @bh: The buffer to add
d4e9c4c3	139	* @meta: True in the case of adding metadata
b3b94faa DT	140	*
	141	*/
	142
d4e9c4c3	143	void gfs2_trans_add_bh(struct gfs2_glock gl, struct buffer_head bh, int meta)
b3b94faa DT	144	{
	145	struct gfs2_sbd *sdp = gl->gl_sbd;
	146	struct gfs2_bufdata *bd;
	147
5c676f6d	148	bd = bh->b_private;
b3b94faa DT	149	if (bd)
	150	gfs2_assert(sdp, bd->bd_gl == gl);
	151	else {
586dfdaa	152	gfs2_attach_bufdata(gl, bh, meta);
5c676f6d	153	bd = bh->b_private;
b3b94faa	154	}
b3b94faa DT	155	lops_add(sdp, &bd->bd_le);
	156	}
	157
1ad38c43	158	void gfs2_trans_add_revoke(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
b3b94faa	159	{
1ad38c43 SW	160	BUG_ON(!list_empty(&bd->bd_le.le_list));
	161	BUG_ON(!list_empty(&bd->bd_ail_st_list));
	162	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
82e86087	163	lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
82e86087	164	lops_add(sdp, &bd->bd_le);
b3b94faa DT	165	}
b3b94faa DT	166
5731be53	167	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
b3b94faa	168	{
5731be53 SW	169	struct gfs2_bufdata bd, tmp;
	170	struct gfs2_trans *tr = current->journal_info;
	171	unsigned int n = len;
b3b94faa DT	172
b3b94faa DT	173	gfs2_log_lock(sdp);
5731be53 SW	174	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
5731be53 SW	175	if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
1ad38c43	176	list_del_init(&bd->bd_le.le_list);
b3b94faa DT	177	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
b3b94faa DT	178	sdp->sd_log_num_revoke--;
5731be53 SW	179	kmem_cache_free(gfs2_bufdata_cachep, bd);
	180	tr->tr_num_revoke_rm++;
	181	if (--n == 0)
	182	break;
b3b94faa DT	183	}
b3b94faa DT	184	}
b3b94faa	185	gfs2_log_unlock(sdp);
b3b94faa DT	186	}
	187
	188	void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
	189	{
	190	lops_add(rgd->rd_sbd, &rgd->rd_le);
	191	}
	192