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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/sched.h>
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/kallsyms.h>
15#include <linux/gfs2_ondisk.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "glock.h"
20#include "inode.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
28static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
29{
30 fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
31 fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
32 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
33 test_bit(TR_TOUCHED, &tr->tr_flags));
34 fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
35 tr->tr_num_buf_new, tr->tr_num_buf_rm,
36 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
37 tr->tr_num_revoke, tr->tr_num_revoke_rm);
38}
39
40int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
41 unsigned int revokes)
42{
43 struct gfs2_trans *tr;
44 int error;
45
46 if (current->journal_info) {
47 gfs2_print_trans(sdp, current->journal_info);
48 BUG();
49 }
50 BUG_ON(blocks == 0 && revokes == 0);
51
52 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
53 return -EROFS;
54
55 tr = kmem_cache_zalloc(gfs2_trans_cachep, GFP_NOFS);
56 if (!tr)
57 return -ENOMEM;
58
59 tr->tr_ip = _RET_IP_;
60 tr->tr_blocks = blocks;
61 tr->tr_revokes = revokes;
62 tr->tr_reserved = 1;
63 set_bit(TR_ALLOCED, &tr->tr_flags);
64 if (blocks)
65 tr->tr_reserved += 6 + blocks;
66 if (revokes)
67 tr->tr_reserved += gfs2_struct2blk(sdp, revokes);
68 INIT_LIST_HEAD(&tr->tr_databuf);
69 INIT_LIST_HEAD(&tr->tr_buf);
70 INIT_LIST_HEAD(&tr->tr_list);
71 INIT_LIST_HEAD(&tr->tr_ail1_list);
72 INIT_LIST_HEAD(&tr->tr_ail2_list);
73
74 sb_start_intwrite(sdp->sd_vfs);
75
76 error = gfs2_log_reserve(sdp, tr->tr_reserved);
77 if (error)
78 goto fail;
79
80 current->journal_info = tr;
81
82 return 0;
83
84fail:
85 sb_end_intwrite(sdp->sd_vfs);
86 kmem_cache_free(gfs2_trans_cachep, tr);
87
88 return error;
89}
90
91void gfs2_trans_end(struct gfs2_sbd *sdp)
92{
93 struct gfs2_trans *tr = current->journal_info;
94 s64 nbuf;
95 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
96
97 current->journal_info = NULL;
98
99 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
100 gfs2_log_release(sdp, tr->tr_reserved);
101 if (alloced) {
102 gfs2_trans_free(sdp, tr);
103 sb_end_intwrite(sdp->sd_vfs);
104 }
105 return;
106 }
107
108 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
109 nbuf -= tr->tr_num_buf_rm;
110 nbuf -= tr->tr_num_databuf_rm;
111
112 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
113 (tr->tr_num_revoke <= tr->tr_revokes)))
114 gfs2_print_trans(sdp, tr);
115
116 gfs2_log_commit(sdp, tr);
117 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
118 gfs2_trans_free(sdp, tr);
119 up_read(&sdp->sd_log_flush_lock);
120
121 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
122 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
123 GFS2_LFC_TRANS_END);
124 if (alloced)
125 sb_end_intwrite(sdp->sd_vfs);
126}
127
128static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
129 struct buffer_head *bh)
130{
131 struct gfs2_bufdata *bd;
132
133 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
134 bd->bd_bh = bh;
135 bd->bd_gl = gl;
136 INIT_LIST_HEAD(&bd->bd_list);
137 bh->b_private = bd;
138 return bd;
139}
140
141/**
142 * gfs2_trans_add_data - Add a databuf to the transaction.
143 * @gl: The inode glock associated with the buffer
144 * @bh: The buffer to add
145 *
146 * This is used in journaled data mode.
147 * We need to journal the data block in the same way as metadata in
148 * the functions above. The difference is that here we have a tag
149 * which is two __be64's being the block number (as per meta data)
150 * and a flag which says whether the data block needs escaping or
151 * not. This means we need a new log entry for each 251 or so data
152 * blocks, which isn't an enormous overhead but twice as much as
153 * for normal metadata blocks.
154 */
155void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
156{
157 struct gfs2_trans *tr = current->journal_info;
158 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
159 struct gfs2_bufdata *bd;
160
161 lock_buffer(bh);
162 if (buffer_pinned(bh)) {
163 set_bit(TR_TOUCHED, &tr->tr_flags);
164 goto out;
165 }
166 gfs2_log_lock(sdp);
167 bd = bh->b_private;
168 if (bd == NULL) {
169 gfs2_log_unlock(sdp);
170 unlock_buffer(bh);
171 if (bh->b_private == NULL)
172 bd = gfs2_alloc_bufdata(gl, bh);
173 else
174 bd = bh->b_private;
175 lock_buffer(bh);
176 gfs2_log_lock(sdp);
177 }
178 gfs2_assert(sdp, bd->bd_gl == gl);
179 set_bit(TR_TOUCHED, &tr->tr_flags);
180 if (list_empty(&bd->bd_list)) {
181 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
182 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
183 gfs2_pin(sdp, bd->bd_bh);
184 tr->tr_num_databuf_new++;
185 list_add_tail(&bd->bd_list, &tr->tr_databuf);
186 }
187 gfs2_log_unlock(sdp);
188out:
189 unlock_buffer(bh);
190}
191
192void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
193{
194
195 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
196 struct gfs2_bufdata *bd;
197 struct gfs2_meta_header *mh;
198 struct gfs2_trans *tr = current->journal_info;
199 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
200
201 lock_buffer(bh);
202 if (buffer_pinned(bh)) {
203 set_bit(TR_TOUCHED, &tr->tr_flags);
204 goto out;
205 }
206 gfs2_log_lock(sdp);
207 bd = bh->b_private;
208 if (bd == NULL) {
209 gfs2_log_unlock(sdp);
210 unlock_buffer(bh);
211 lock_page(bh->b_page);
212 if (bh->b_private == NULL)
213 bd = gfs2_alloc_bufdata(gl, bh);
214 else
215 bd = bh->b_private;
216 unlock_page(bh->b_page);
217 lock_buffer(bh);
218 gfs2_log_lock(sdp);
219 }
220 gfs2_assert(sdp, bd->bd_gl == gl);
221 set_bit(TR_TOUCHED, &tr->tr_flags);
222 if (!list_empty(&bd->bd_list))
223 goto out_unlock;
224 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
225 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
226 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
227 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
228 fs_err(sdp, "Attempting to add uninitialised block to "
229 "journal (inplace block=%lld)\n",
230 (unsigned long long)bd->bd_bh->b_blocknr);
231 BUG();
232 }
233 if (unlikely(state == SFS_FROZEN)) {
234 fs_info(sdp, "GFS2:adding buf while frozen\n");
235 gfs2_assert_withdraw(sdp, 0);
236 }
237 if (unlikely(gfs2_withdrawn(sdp))) {
238 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n",
239 (unsigned long long)bd->bd_bh->b_blocknr);
240 }
241 gfs2_pin(sdp, bd->bd_bh);
242 mh->__pad0 = cpu_to_be64(0);
243 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
244 list_add(&bd->bd_list, &tr->tr_buf);
245 tr->tr_num_buf_new++;
246out_unlock:
247 gfs2_log_unlock(sdp);
248out:
249 unlock_buffer(bh);
250}
251
252void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
253{
254 struct gfs2_trans *tr = current->journal_info;
255
256 BUG_ON(!list_empty(&bd->bd_list));
257 gfs2_add_revoke(sdp, bd);
258 set_bit(TR_TOUCHED, &tr->tr_flags);
259 tr->tr_num_revoke++;
260}
261
262void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
263{
264 struct gfs2_bufdata *bd, *tmp;
265 struct gfs2_trans *tr = current->journal_info;
266 unsigned int n = len;
267
268 gfs2_log_lock(sdp);
269 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) {
270 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
271 list_del_init(&bd->bd_list);
272 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
273 sdp->sd_log_num_revoke--;
274 if (bd->bd_gl)
275 gfs2_glock_remove_revoke(bd->bd_gl);
276 kmem_cache_free(gfs2_bufdata_cachep, bd);
277 tr->tr_num_revoke_rm++;
278 if (--n == 0)
279 break;
280 }
281 }
282 gfs2_log_unlock(sdp);
283}
284
285void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
286{
287 if (tr == NULL)
288 return;
289
290 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
291 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
292 gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf));
293 gfs2_assert_warn(sdp, list_empty(&tr->tr_buf));
294 kmem_cache_free(gfs2_trans_cachep, tr);
295}