[mirror_ubuntu-artful-kernel.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));
	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);
}

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);
		}
		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);
}

/**
 * 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);
}

void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
{
	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));
	lops_init_le(bd, &gfs2_revoke_lops);
	lops_add(sdp, bd);
}

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 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));
579b78a4	53	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
b3b94faa	54
e317ffcb	55	error = gfs2_glock_nq(&tr->tr_t_gh);
b3b94faa	56	if (error)
e317ffcb	57	goto fail_holder_uninit;
b3b94faa	58
b3b94faa DT	59	error = gfs2_log_reserve(sdp, tr->tr_reserved);
	60	if (error)
	61	goto fail_gunlock;
	62
5c676f6d	63	current->journal_info = tr;
b3b94faa DT	64
	65	return 0;
	66
484adff8	67	fail_gunlock:
e317ffcb	68	gfs2_glock_dq(&tr->tr_t_gh);
b3b94faa	69
484adff8	70	fail_holder_uninit:
e317ffcb	71	gfs2_holder_uninit(&tr->tr_t_gh);
b3b94faa DT	72	kfree(tr);
	73
	74	return error;
	75	}
	76
5e687eac BM	77	/**
	78	* gfs2_log_release - Release a given number of log blocks
	79	* @sdp: The GFS2 superblock
	80	* @blks: The number of blocks
	81	*
	82	*/
	83
	84	static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
	85	{
	86
	87	atomic_add(blks, &sdp->sd_log_blks_free);
	88	trace_gfs2_log_blocks(sdp, blks);
	89	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
	90	sdp->sd_jdesc->jd_blocks);
	91	up_read(&sdp->sd_log_flush_lock);
	92	}
	93
c50b91c4 SW	94	static void gfs2_print_trans(const struct gfs2_trans *tr)
	95	{
	96	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	97	printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
	98	tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
	99	printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
	100	tr->tr_num_buf_new, tr->tr_num_buf_rm,
	101	tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
	102	tr->tr_num_revoke, tr->tr_num_revoke_rm);
	103	}
	104
b3b94faa DT	105	void gfs2_trans_end(struct gfs2_sbd *sdp)
b3b94faa DT	106	{
f4154ea0	107	struct gfs2_trans *tr = current->journal_info;
c50b91c4	108	s64 nbuf;
f4154ea0	109	BUG_ON(!tr);
5c676f6d	110	current->journal_info = NULL;
b3b94faa	111
b3b94faa DT	112	if (!tr->tr_touched) {
b3b94faa DT	113	gfs2_log_release(sdp, tr->tr_reserved);
d8348de0 SW	114	if (tr->tr_t_gh.gh_gl) {
	115	gfs2_glock_dq(&tr->tr_t_gh);
	116	gfs2_holder_uninit(&tr->tr_t_gh);
	117	kfree(tr);
	118	}
b3b94faa DT	119	return;
	120	}
	121
c50b91c4 SW	122	nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
	123	nbuf -= tr->tr_num_buf_rm;
	124	nbuf -= tr->tr_num_databuf_rm;
	125
	126	if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
	127	(tr->tr_num_revoke <= tr->tr_revokes)))
	128	gfs2_print_trans(tr);
b3b94faa DT	129
b3b94faa DT	130	gfs2_log_commit(sdp, tr);
d8348de0 SW	131	if (tr->tr_t_gh.gh_gl) {
	132	gfs2_glock_dq(&tr->tr_t_gh);
	133	gfs2_holder_uninit(&tr->tr_t_gh);
	134	kfree(tr);
	135	}
b3b94faa DT	136
b3b94faa DT	137	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
b09e593d	138	gfs2_log_flush(sdp, NULL);
b3b94faa DT	139	}
b3b94faa DT	140
b3b94faa DT	141	/**
	142	* gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
	143	* @gl: the glock the buffer belongs to
	144	* @bh: The buffer to add
d4e9c4c3	145	* @meta: True in the case of adding metadata
b3b94faa DT	146	*
	147	*/
	148
d4e9c4c3	149	void gfs2_trans_add_bh(struct gfs2_glock gl, struct buffer_head bh, int meta)
b3b94faa DT	150	{
	151	struct gfs2_sbd *sdp = gl->gl_sbd;
	152	struct gfs2_bufdata *bd;
	153
5c676f6d	154	bd = bh->b_private;
b3b94faa DT	155	if (bd)
	156	gfs2_assert(sdp, bd->bd_gl == gl);
	157	else {
586dfdaa	158	gfs2_attach_bufdata(gl, bh, meta);
5c676f6d	159	bd = bh->b_private;
b3b94faa	160	}
c0752aa7	161	lops_add(sdp, bd);
b3b94faa DT	162	}
b3b94faa DT	163
1ad38c43	164	void gfs2_trans_add_revoke(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
b3b94faa	165	{
c0752aa7	166	BUG_ON(!list_empty(&bd->bd_list));
1ad38c43 SW	167	BUG_ON(!list_empty(&bd->bd_ail_st_list));
1ad38c43 SW	168	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
c0752aa7 BP	169	lops_init_le(bd, &gfs2_revoke_lops);
c0752aa7 BP	170	lops_add(sdp, bd);
b3b94faa DT	171	}
b3b94faa DT	172
5731be53	173	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
b3b94faa	174	{
5731be53 SW	175	struct gfs2_bufdata bd, tmp;
	176	struct gfs2_trans *tr = current->journal_info;
	177	unsigned int n = len;
b3b94faa DT	178
b3b94faa DT	179	gfs2_log_lock(sdp);
c0752aa7	180	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
5731be53	181	if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
c0752aa7	182	list_del_init(&bd->bd_list);
b3b94faa DT	183	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
b3b94faa DT	184	sdp->sd_log_num_revoke--;
5731be53 SW	185	kmem_cache_free(gfs2_bufdata_cachep, bd);
	186	tr->tr_num_revoke_rm++;
	187	if (--n == 0)
	188	break;
b3b94faa DT	189	}
b3b94faa DT	190	}
b3b94faa	191	gfs2_log_unlock(sdp);
b3b94faa DT	192	}
b3b94faa DT	193