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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 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>
15#include <linux/kallsyms.h>
16#include <linux/gfs2_ondisk.h>
17
18#include "gfs2.h"
19#include "incore.h"
20#include "glock.h"
21#include "log.h"
22#include "lops.h"
23#include "meta_io.h"
24#include "trans.h"
25#include "util.h"
26#include "trace_gfs2.h"
27
28int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
29 unsigned int revokes)
30{
31 struct gfs2_trans *tr;
32 int error;
33
34 BUG_ON(current->journal_info);
35 BUG_ON(blocks == 0 && revokes == 0);
36
37 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
38 return -EROFS;
39
40 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
41 if (!tr)
42 return -ENOMEM;
43
44 tr->tr_ip = (unsigned long)__builtin_return_address(0);
45 tr->tr_blocks = blocks;
46 tr->tr_revokes = revokes;
47 tr->tr_reserved = 1;
48 if (blocks)
49 tr->tr_reserved += 6 + blocks;
50 if (revokes)
51 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
52 sizeof(u64));
53 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
54
55 error = gfs2_glock_nq(&tr->tr_t_gh);
56 if (error)
57 goto fail_holder_uninit;
58
59 error = gfs2_log_reserve(sdp, tr->tr_reserved);
60 if (error)
61 goto fail_gunlock;
62
63 current->journal_info = tr;
64
65 return 0;
66
67fail_gunlock:
68 gfs2_glock_dq(&tr->tr_t_gh);
69
70fail_holder_uninit:
71 gfs2_holder_uninit(&tr->tr_t_gh);
72 kfree(tr);
73
74 return error;
75}
76
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
84static 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
94static 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
105void gfs2_trans_end(struct gfs2_sbd *sdp)
106{
107 struct gfs2_trans *tr = current->journal_info;
108 s64 nbuf;
109 BUG_ON(!tr);
110 current->journal_info = NULL;
111
112 if (!tr->tr_touched) {
113 gfs2_log_release(sdp, tr->tr_reserved);
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 }
119 return;
120 }
121
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);
129
130 gfs2_log_commit(sdp, tr);
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 }
136
137 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
138 gfs2_log_flush(sdp, NULL);
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
145 * @meta: True in the case of adding metadata
146 *
147 */
148
149void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
150{
151 struct gfs2_sbd *sdp = gl->gl_sbd;
152 struct gfs2_bufdata *bd;
153
154 bd = bh->b_private;
155 if (bd)
156 gfs2_assert(sdp, bd->bd_gl == gl);
157 else {
158 gfs2_attach_bufdata(gl, bh, meta);
159 bd = bh->b_private;
160 }
161 lops_add(sdp, bd);
162}
163
164void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
165{
166 BUG_ON(!list_empty(&bd->bd_list));
167 BUG_ON(!list_empty(&bd->bd_ail_st_list));
168 BUG_ON(!list_empty(&bd->bd_ail_gl_list));
169 lops_init_le(bd, &gfs2_revoke_lops);
170 lops_add(sdp, bd);
171}
172
173void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
174{
175 struct gfs2_bufdata *bd, *tmp;
176 struct gfs2_trans *tr = current->journal_info;
177 unsigned int n = len;
178
179 gfs2_log_lock(sdp);
180 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
181 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
182 list_del_init(&bd->bd_list);
183 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
184 sdp->sd_log_num_revoke--;
185 kmem_cache_free(gfs2_bufdata_cachep, bd);
186 tr->tr_num_revoke_rm++;
187 if (--n == 0)
188 break;
189 }
190 }
191 gfs2_log_unlock(sdp);
192}
193
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 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>
15#include <linux/kallsyms.h>
16#include <linux/gfs2_ondisk.h>
17
18#include "gfs2.h"
19#include "incore.h"
20#include "glock.h"
21#include "log.h"
22#include "lops.h"
23#include "meta_io.h"
24#include "trans.h"
25#include "util.h"
26#include "trace_gfs2.h"
27
28int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
29 unsigned int revokes)
30{
31 struct gfs2_trans *tr;
32 int error;
33
34 BUG_ON(current->journal_info);
35 BUG_ON(blocks == 0 && revokes == 0);
36
37 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
38 return -EROFS;
39
40 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
41 if (!tr)
42 return -ENOMEM;
43
44 tr->tr_ip = (unsigned long)__builtin_return_address(0);
45 tr->tr_blocks = blocks;
46 tr->tr_revokes = revokes;
47 tr->tr_reserved = 1;
48 if (blocks)
49 tr->tr_reserved += 6 + blocks;
50 if (revokes)
51 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
52 sizeof(u64));
53 INIT_LIST_HEAD(&tr->tr_list_buf);
54
55 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
56
57 error = gfs2_glock_nq(&tr->tr_t_gh);
58 if (error)
59 goto fail_holder_uninit;
60
61 error = gfs2_log_reserve(sdp, tr->tr_reserved);
62 if (error)
63 goto fail_gunlock;
64
65 current->journal_info = tr;
66
67 return 0;
68
69fail_gunlock:
70 gfs2_glock_dq(&tr->tr_t_gh);
71
72fail_holder_uninit:
73 gfs2_holder_uninit(&tr->tr_t_gh);
74 kfree(tr);
75
76 return error;
77}
78
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
86static 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
96void gfs2_trans_end(struct gfs2_sbd *sdp)
97{
98 struct gfs2_trans *tr = current->journal_info;
99
100 BUG_ON(!tr);
101 current->journal_info = NULL;
102
103 if (!tr->tr_touched) {
104 gfs2_log_release(sdp, tr->tr_reserved);
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 }
110 return;
111 }
112
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 }
118 if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
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);
122 }
123
124 gfs2_log_commit(sdp, tr);
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 }
130
131 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
132 gfs2_log_flush(sdp, NULL);
133}
134
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
139 * @meta: True in the case of adding metadata
140 *
141 */
142
143void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
144{
145 struct gfs2_sbd *sdp = gl->gl_sbd;
146 struct gfs2_bufdata *bd;
147
148 bd = bh->b_private;
149 if (bd)
150 gfs2_assert(sdp, bd->bd_gl == gl);
151 else {
152 gfs2_attach_bufdata(gl, bh, meta);
153 bd = bh->b_private;
154 }
155 lops_add(sdp, &bd->bd_le);
156}
157
158void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
159{
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));
163 lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
164 lops_add(sdp, &bd->bd_le);
165}
166
167void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
168{
169 struct gfs2_bufdata *bd, *tmp;
170 struct gfs2_trans *tr = current->journal_info;
171 unsigned int n = len;
172
173 gfs2_log_lock(sdp);
174 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
175 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
176 list_del_init(&bd->bd_le.le_list);
177 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
178 sdp->sd_log_num_revoke--;
179 kmem_cache_free(gfs2_bufdata_cachep, bd);
180 tr->tr_num_revoke_rm++;
181 if (--n == 0)
182 break;
183 }
184 }
185 gfs2_log_unlock(sdp);
186}
187
188void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
189{
190 lops_add(rgd->rd_sbd, &rgd->rd_le);
191}
192