[mirror_ubuntu-jammy-kernel.git] / fs / gfs2 / trans.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2005 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 v.2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <asm/semaphore.h>

#include "gfs2.h"
#include "lm_interface.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_i(struct gfs2_sbd *sdp, unsigned int blocks,
		       unsigned int revokes, char *file, unsigned int line)
{
	struct gfs2_trans *tr;
	int error;

	if (gfs2_assert_warn(sdp, !current->journal_info) ||
	    gfs2_assert_warn(sdp, blocks || revokes)) {
		fs_warn(sdp, "(%s, %u)\n", file, line);
		return -EINVAL;
	}

	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
	if (!tr)
		return -ENOMEM;

	tr->tr_file = file;
	tr->tr_line = line;
	tr->tr_blocks = blocks;
	tr->tr_revokes = revokes;
	tr->tr_reserved = 1;
	if (blocks)
		tr->tr_reserved += 1 + blocks;
	if (revokes)
		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
						   sizeof(uint64_t));
	INIT_LIST_HEAD(&tr->tr_list_buf);

	error = -ENOMEM;
	tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED,
				      GL_NEVER_RECURSE, GFP_NOFS);
	if (!tr->tr_t_gh)
		goto fail;

	error = gfs2_glock_nq(tr->tr_t_gh);
	if (error)
		goto fail_holder_put;

	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
		tr->tr_t_gh->gh_flags |= GL_NOCACHE;
		error = -EROFS;
		goto fail_gunlock;
	}

	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_put:
	gfs2_holder_put(tr->tr_t_gh);

 fail:
	kfree(tr);

	return error;
}

void gfs2_trans_end(struct gfs2_sbd *sdp)
{
	struct gfs2_trans *tr;
	struct gfs2_holder *t_gh;

	tr = current->journal_info;
	current->journal_info = NULL;

	if (gfs2_assert_warn(sdp, tr))
		return;

	t_gh = tr->tr_t_gh;
	tr->tr_t_gh = NULL;

	if (!tr->tr_touched) {
		gfs2_log_release(sdp, tr->tr_reserved);
		kfree(tr);

		gfs2_glock_dq(t_gh);
		gfs2_holder_put(t_gh);

		return;
	}

	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
		fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
		       "tr_file = %s, tr_line = %u\n",
		       tr->tr_num_buf, tr->tr_blocks,
		       tr->tr_file, tr->tr_line);
	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
		fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
		       "tr_file = %s, tr_line = %u\n",
		       tr->tr_num_revoke, tr->tr_revokes,
		       tr->tr_file, tr->tr_line);

	gfs2_log_commit(sdp, tr);

	gfs2_glock_dq(t_gh);
	gfs2_holder_put(t_gh);

	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
		gfs2_log_flush(sdp);
}

void gfs2_trans_add_gl(struct gfs2_glock *gl)
{
	lops_add(gl->gl_sbd, &gl->gl_le);
}

/**
 * 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, uint64_t blkno)
{
	struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
					 GFP_NOFS | __GFP_NOFAIL);
	lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
	rv->rv_blkno = blkno;
	lops_add(sdp, &rv->rv_le);
}

void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
{
	struct gfs2_revoke *rv;
	int found = 0;

	gfs2_log_lock(sdp);

	list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
		if (rv->rv_blkno == blkno) {
			list_del(&rv->rv_le.le_list);
			gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
			sdp->sd_log_num_revoke--;
			found = 1;
			break;
		}
	}

	gfs2_log_unlock(sdp);

	if (found) {
		struct gfs2_trans *tr = current->journal_info;
		kfree(rv);
		tr->tr_num_revoke_rm++;
	}
}

void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
{
	lops_add(rgd->rd_sbd, &rgd->rd_le);
}
Commit	Line	Data
b3b94faa DT	1	/*
	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	3	* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
	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
	7	* of the GNU General Public License v.2.
	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>
5c676f6d	15	#include <linux/gfs2_ondisk.h>
b3b94faa DT	16	#include <asm/semaphore.h>
	17
	18	#include "gfs2.h"
5c676f6d SW	19	#include "lm_interface.h"
5c676f6d SW	20	#include "incore.h"
b3b94faa DT	21	#include "glock.h"
	22	#include "log.h"
	23	#include "lops.h"
	24	#include "meta_io.h"
	25	#include "trans.h"
5c676f6d	26	#include "util.h"
b3b94faa DT	27
	28	int gfs2_trans_begin_i(struct gfs2_sbd *sdp, unsigned int blocks,
	29	unsigned int revokes, char *file, unsigned int line)
	30	{
	31	struct gfs2_trans *tr;
	32	int error;
	33
5c676f6d	34	if (gfs2_assert_warn(sdp, !current->journal_info) \|\|
b3b94faa DT	35	gfs2_assert_warn(sdp, blocks \|\| revokes)) {
	36	fs_warn(sdp, "(%s, %u)\n", file, line);
	37	return -EINVAL;
	38	}
	39
f55ab26a	40	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
b3b94faa DT	41	if (!tr)
	42	return -ENOMEM;
	43
	44	tr->tr_file = file;
	45	tr->tr_line = line;
	46	tr->tr_blocks = blocks;
	47	tr->tr_revokes = revokes;
	48	tr->tr_reserved = 1;
	49	if (blocks)
	50	tr->tr_reserved += 1 + blocks;
	51	if (revokes)
	52	tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
	53	sizeof(uint64_t));
	54	INIT_LIST_HEAD(&tr->tr_list_buf);
	55
	56	error = -ENOMEM;
	57	tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED,
f55ab26a	58	GL_NEVER_RECURSE, GFP_NOFS);
b3b94faa DT	59	if (!tr->tr_t_gh)
	60	goto fail;
	61
	62	error = gfs2_glock_nq(tr->tr_t_gh);
	63	if (error)
	64	goto fail_holder_put;
	65
	66	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	67	tr->tr_t_gh->gh_flags \|= GL_NOCACHE;
	68	error = -EROFS;
	69	goto fail_gunlock;
	70	}
	71
	72	error = gfs2_log_reserve(sdp, tr->tr_reserved);
	73	if (error)
	74	goto fail_gunlock;
	75
5c676f6d	76	current->journal_info = tr;
b3b94faa DT	77
	78	return 0;
	79
	80	fail_gunlock:
	81	gfs2_glock_dq(tr->tr_t_gh);
	82
	83	fail_holder_put:
	84	gfs2_holder_put(tr->tr_t_gh);
	85
	86	fail:
	87	kfree(tr);
	88
	89	return error;
	90	}
	91
	92	void gfs2_trans_end(struct gfs2_sbd *sdp)
	93	{
	94	struct gfs2_trans *tr;
	95	struct gfs2_holder *t_gh;
	96
5c676f6d SW	97	tr = current->journal_info;
5c676f6d SW	98	current->journal_info = NULL;
b3b94faa DT	99
	100	if (gfs2_assert_warn(sdp, tr))
	101	return;
	102
	103	t_gh = tr->tr_t_gh;
	104	tr->tr_t_gh = NULL;
	105
	106	if (!tr->tr_touched) {
	107	gfs2_log_release(sdp, tr->tr_reserved);
	108	kfree(tr);
	109
	110	gfs2_glock_dq(t_gh);
	111	gfs2_holder_put(t_gh);
	112
	113	return;
	114	}
	115
	116	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
	117	fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
	118	"tr_file = %s, tr_line = %u\n",
	119	tr->tr_num_buf, tr->tr_blocks,
	120	tr->tr_file, tr->tr_line);
	121	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
	122	fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
	123	"tr_file = %s, tr_line = %u\n",
	124	tr->tr_num_revoke, tr->tr_revokes,
	125	tr->tr_file, tr->tr_line);
	126
	127	gfs2_log_commit(sdp, tr);
	128
	129	gfs2_glock_dq(t_gh);
	130	gfs2_holder_put(t_gh);
	131
	132	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
	133	gfs2_log_flush(sdp);
	134	}
	135
	136	void gfs2_trans_add_gl(struct gfs2_glock *gl)
	137	{
	138	lops_add(gl->gl_sbd, &gl->gl_le);
	139	}
	140
	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	}
b3b94faa DT	161	lops_add(sdp, &bd->bd_le);
	162	}
	163
	164	void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
	165	{
	166	struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
18ec7d5c	167	GFP_NOFS \| __GFP_NOFAIL);
b3b94faa DT	168	lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
	169	rv->rv_blkno = blkno;
	170	lops_add(sdp, &rv->rv_le);
	171	}
	172
	173	void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
	174	{
	175	struct gfs2_revoke *rv;
	176	int found = 0;
	177
	178	gfs2_log_lock(sdp);
	179
	180	list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
	181	if (rv->rv_blkno == blkno) {
	182	list_del(&rv->rv_le.le_list);
	183	gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
	184	sdp->sd_log_num_revoke--;
	185	found = 1;
	186	break;
	187	}
	188	}
	189
	190	gfs2_log_unlock(sdp);
	191
	192	if (found) {
5c676f6d	193	struct gfs2_trans *tr = current->journal_info;
b3b94faa	194	kfree(rv);
5c676f6d	195	tr->tr_num_revoke_rm++;
b3b94faa DT	196	}
	197	}
	198
	199	void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
	200	{
	201	lops_add(rgd->rd_sbd, &rgd->rd_le);
	202	}
	203