[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"

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;
}

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"
b3b94faa	26
d0dc80db SW	27	int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
d0dc80db SW	28	unsigned int revokes)
b3b94faa DT	29	{
	30	struct gfs2_trans *tr;
	31	int error;
	32
d0dc80db SW	33	BUG_ON(current->journal_info);
d0dc80db SW	34	BUG_ON(blocks == 0 && revokes == 0);
b3b94faa	35
a1c0643f SW	36	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
	37	return -EROFS;
	38
f55ab26a	39	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
b3b94faa DT	40	if (!tr)
	41	return -ENOMEM;
	42
d0dc80db	43	tr->tr_ip = (unsigned long)__builtin_return_address(0);
b3b94faa DT	44	tr->tr_blocks = blocks;
	45	tr->tr_revokes = revokes;
	46	tr->tr_reserved = 1;
	47	if (blocks)
f4154ea0	48	tr->tr_reserved += 6 + blocks;
b3b94faa DT	49	if (revokes)
b3b94faa DT	50	tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
cd915493	51	sizeof(u64));
b3b94faa DT	52	INIT_LIST_HEAD(&tr->tr_list_buf);
b3b94faa DT	53
579b78a4	54	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
b3b94faa	55
e317ffcb	56	error = gfs2_glock_nq(&tr->tr_t_gh);
b3b94faa	57	if (error)
e317ffcb	58	goto fail_holder_uninit;
b3b94faa	59
b3b94faa DT	60	error = gfs2_log_reserve(sdp, tr->tr_reserved);
	61	if (error)
	62	goto fail_gunlock;
	63
5c676f6d	64	current->journal_info = tr;
b3b94faa DT	65
	66	return 0;
	67
484adff8	68	fail_gunlock:
e317ffcb	69	gfs2_glock_dq(&tr->tr_t_gh);
b3b94faa	70
484adff8	71	fail_holder_uninit:
e317ffcb	72	gfs2_holder_uninit(&tr->tr_t_gh);
b3b94faa DT	73	kfree(tr);
	74
	75	return error;
	76	}
	77
	78	void gfs2_trans_end(struct gfs2_sbd *sdp)
	79	{
f4154ea0	80	struct gfs2_trans *tr = current->journal_info;
b3b94faa	81
f4154ea0	82	BUG_ON(!tr);
5c676f6d	83	current->journal_info = NULL;
b3b94faa	84
b3b94faa DT	85	if (!tr->tr_touched) {
b3b94faa DT	86	gfs2_log_release(sdp, tr->tr_reserved);
d8348de0 SW	87	if (tr->tr_t_gh.gh_gl) {
	88	gfs2_glock_dq(&tr->tr_t_gh);
	89	gfs2_holder_uninit(&tr->tr_t_gh);
	90	kfree(tr);
	91	}
b3b94faa DT	92	return;
	93	}
	94
d0dc80db SW	95	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
	96	fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
	97	tr->tr_num_buf, tr->tr_blocks);
	98	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	99	}
cd45697f	100	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
d0dc80db SW	101	fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
	102	tr->tr_num_revoke, tr->tr_revokes);
	103	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
cd45697f	104	}
b3b94faa DT	105
b3b94faa DT	106	gfs2_log_commit(sdp, tr);
d8348de0 SW	107	if (tr->tr_t_gh.gh_gl) {
	108	gfs2_glock_dq(&tr->tr_t_gh);
	109	gfs2_holder_uninit(&tr->tr_t_gh);
	110	kfree(tr);
	111	}
b3b94faa DT	112
b3b94faa DT	113	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
b09e593d	114	gfs2_log_flush(sdp, NULL);
b3b94faa DT	115	}
b3b94faa DT	116
b3b94faa DT	117	/**
	118	* gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
	119	* @gl: the glock the buffer belongs to
	120	* @bh: The buffer to add
d4e9c4c3	121	* @meta: True in the case of adding metadata
b3b94faa DT	122	*
	123	*/
	124
d4e9c4c3	125	void gfs2_trans_add_bh(struct gfs2_glock gl, struct buffer_head bh, int meta)
b3b94faa DT	126	{
	127	struct gfs2_sbd *sdp = gl->gl_sbd;
	128	struct gfs2_bufdata *bd;
	129
5c676f6d	130	bd = bh->b_private;
b3b94faa DT	131	if (bd)
	132	gfs2_assert(sdp, bd->bd_gl == gl);
	133	else {
586dfdaa	134	gfs2_attach_bufdata(gl, bh, meta);
5c676f6d	135	bd = bh->b_private;
b3b94faa	136	}
b3b94faa DT	137	lops_add(sdp, &bd->bd_le);
	138	}
	139
1ad38c43	140	void gfs2_trans_add_revoke(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
b3b94faa	141	{
1ad38c43 SW	142	BUG_ON(!list_empty(&bd->bd_le.le_list));
	143	BUG_ON(!list_empty(&bd->bd_ail_st_list));
	144	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
82e86087	145	lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
82e86087	146	lops_add(sdp, &bd->bd_le);
b3b94faa DT	147	}
b3b94faa DT	148
5731be53	149	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
b3b94faa	150	{
5731be53 SW	151	struct gfs2_bufdata bd, tmp;
	152	struct gfs2_trans *tr = current->journal_info;
	153	unsigned int n = len;
b3b94faa DT	154
b3b94faa DT	155	gfs2_log_lock(sdp);
5731be53 SW	156	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
5731be53 SW	157	if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
1ad38c43	158	list_del_init(&bd->bd_le.le_list);
b3b94faa DT	159	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
b3b94faa DT	160	sdp->sd_log_num_revoke--;
5731be53 SW	161	kmem_cache_free(gfs2_bufdata_cachep, bd);
	162	tr->tr_num_revoke_rm++;
	163	if (--n == 0)
	164	break;
b3b94faa DT	165	}
b3b94faa DT	166	}
b3b94faa	167	gfs2_log_unlock(sdp);
b3b94faa DT	168	}
	169
	170	void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
	171	{
	172	lops_add(rgd->rd_sbd, &rgd->rd_le);
	173	}
	174