[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));
	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);
}

/**
 * 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;

	lock_buffer(bh);
	gfs2_log_lock(sdp);
	bd = bh->b_private;
	if (bd)
		gfs2_assert(sdp, bd->bd_gl == gl);
	else {
		gfs2_log_unlock(sdp);
		unlock_buffer(bh);
		gfs2_attach_bufdata(gl, bh, meta);
		bd = bh->b_private;
		lock_buffer(bh);
		gfs2_log_lock(sdp);
	}
	lops_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));
	lops_init_le(bd, &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 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));
39263d5e	53	sb_start_intwrite(sdp->sd_vfs);
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:
39263d5e	72	sb_end_intwrite(sdp->sd_vfs);
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
c50b91c4 SW	96	static void gfs2_print_trans(const struct gfs2_trans *tr)
	97	{
	98	print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
	99	printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
	100	tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
	101	printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
	102	tr->tr_num_buf_new, tr->tr_num_buf_rm,
	103	tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
	104	tr->tr_num_revoke, tr->tr_num_revoke_rm);
	105	}
	106
b3b94faa DT	107	void gfs2_trans_end(struct gfs2_sbd *sdp)
b3b94faa DT	108	{
f4154ea0	109	struct gfs2_trans *tr = current->journal_info;
c50b91c4	110	s64 nbuf;
f4154ea0	111	BUG_ON(!tr);
5c676f6d	112	current->journal_info = NULL;
b3b94faa	113
b3b94faa DT	114	if (!tr->tr_touched) {
b3b94faa DT	115	gfs2_log_release(sdp, tr->tr_reserved);
d8348de0 SW	116	if (tr->tr_t_gh.gh_gl) {
	117	gfs2_glock_dq(&tr->tr_t_gh);
	118	gfs2_holder_uninit(&tr->tr_t_gh);
	119	kfree(tr);
	120	}
39263d5e	121	sb_end_intwrite(sdp->sd_vfs);
b3b94faa DT	122	return;
	123	}
	124
c50b91c4 SW	125	nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
	126	nbuf -= tr->tr_num_buf_rm;
	127	nbuf -= tr->tr_num_databuf_rm;
	128
	129	if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
	130	(tr->tr_num_revoke <= tr->tr_revokes)))
	131	gfs2_print_trans(tr);
b3b94faa DT	132
b3b94faa DT	133	gfs2_log_commit(sdp, tr);
d8348de0 SW	134	if (tr->tr_t_gh.gh_gl) {
	135	gfs2_glock_dq(&tr->tr_t_gh);
	136	gfs2_holder_uninit(&tr->tr_t_gh);
	137	kfree(tr);
	138	}
b3b94faa DT	139
b3b94faa DT	140	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
b09e593d	141	gfs2_log_flush(sdp, NULL);
39263d5e	142	sb_end_intwrite(sdp->sd_vfs);
b3b94faa DT	143	}
b3b94faa DT	144
b3b94faa DT	145	/**
	146	* gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
	147	* @gl: the glock the buffer belongs to
	148	* @bh: The buffer to add
d4e9c4c3	149	* @meta: True in the case of adding metadata
b3b94faa DT	150	*
	151	*/
	152
d4e9c4c3	153	void gfs2_trans_add_bh(struct gfs2_glock gl, struct buffer_head bh, int meta)
b3b94faa DT	154	{
	155	struct gfs2_sbd *sdp = gl->gl_sbd;
	156	struct gfs2_bufdata *bd;
	157
96e5d1d3 BM	158	lock_buffer(bh);
96e5d1d3 BM	159	gfs2_log_lock(sdp);
5c676f6d	160	bd = bh->b_private;
b3b94faa DT	161	if (bd)
	162	gfs2_assert(sdp, bd->bd_gl == gl);
	163	else {
96e5d1d3 BM	164	gfs2_log_unlock(sdp);
96e5d1d3 BM	165	unlock_buffer(bh);
586dfdaa	166	gfs2_attach_bufdata(gl, bh, meta);
5c676f6d	167	bd = bh->b_private;
96e5d1d3 BM	168	lock_buffer(bh);
96e5d1d3 BM	169	gfs2_log_lock(sdp);
b3b94faa	170	}
c0752aa7	171	lops_add(sdp, bd);
96e5d1d3 BM	172	gfs2_log_unlock(sdp);
96e5d1d3 BM	173	unlock_buffer(bh);
b3b94faa DT	174	}
b3b94faa DT	175
1ad38c43	176	void gfs2_trans_add_revoke(struct gfs2_sbd sdp, struct gfs2_bufdata bd)
b3b94faa	177	{
75f2b879 SW	178	struct gfs2_glock *gl = bd->bd_gl;
	179	struct gfs2_trans *tr = current->journal_info;
	180
c0752aa7	181	BUG_ON(!list_empty(&bd->bd_list));
1ad38c43 SW	182	BUG_ON(!list_empty(&bd->bd_ail_st_list));
1ad38c43 SW	183	BUG_ON(!list_empty(&bd->bd_ail_gl_list));
c0752aa7	184	lops_init_le(bd, &gfs2_revoke_lops);
75f2b879 SW	185	tr->tr_touched = 1;
	186	tr->tr_num_revoke++;
	187	sdp->sd_log_num_revoke++;
	188	atomic_inc(&gl->gl_revokes);
	189	set_bit(GLF_LFLUSH, &gl->gl_flags);
	190	list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
b3b94faa DT	191	}
b3b94faa DT	192
5731be53	193	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
b3b94faa	194	{
5731be53 SW	195	struct gfs2_bufdata bd, tmp;
	196	struct gfs2_trans *tr = current->journal_info;
	197	unsigned int n = len;
b3b94faa DT	198
b3b94faa DT	199	gfs2_log_lock(sdp);
c0752aa7	200	list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
5731be53	201	if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
c0752aa7	202	list_del_init(&bd->bd_list);
b3b94faa DT	203	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
b3b94faa DT	204	sdp->sd_log_num_revoke--;
5731be53 SW	205	kmem_cache_free(gfs2_bufdata_cachep, bd);
	206	tr->tr_num_revoke_rm++;
	207	if (--n == 0)
	208	break;
b3b94faa DT	209	}
b3b94faa DT	210	}
b3b94faa	211	gfs2_log_unlock(sdp);
b3b94faa DT	212	}
b3b94faa DT	213