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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/sched.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/completion.h>
16#include <linux/buffer_head.h>
17#include <linux/kallsyms.h>
18#include <linux/gfs2_ondisk.h>
19
20#include "gfs2.h"
21#include "incore.h"
22#include "glock.h"
23#include "inode.h"
24#include "log.h"
25#include "lops.h"
26#include "meta_io.h"
27#include "trans.h"
28#include "util.h"
29#include "trace_gfs2.h"
30
31int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
32 unsigned int revokes)
33{
34 struct gfs2_trans *tr;
35 int error;
36
37 BUG_ON(current->journal_info);
38 BUG_ON(blocks == 0 && revokes == 0);
39
40 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
41 return -EROFS;
42
43 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
44 if (!tr)
45 return -ENOMEM;
46
47 tr->tr_ip = (unsigned long)__builtin_return_address(0);
48 tr->tr_blocks = blocks;
49 tr->tr_revokes = revokes;
50 tr->tr_reserved = 1;
51 if (blocks)
52 tr->tr_reserved += 6 + blocks;
53 if (revokes)
54 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
55 sizeof(u64));
56 INIT_LIST_HEAD(&tr->tr_databuf);
57 INIT_LIST_HEAD(&tr->tr_buf);
58
59 sb_start_intwrite(sdp->sd_vfs);
60 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
61
62 error = gfs2_glock_nq(&tr->tr_t_gh);
63 if (error)
64 goto fail_holder_uninit;
65
66 error = gfs2_log_reserve(sdp, tr->tr_reserved);
67 if (error)
68 goto fail_gunlock;
69
70 current->journal_info = tr;
71
72 return 0;
73
74fail_gunlock:
75 gfs2_glock_dq(&tr->tr_t_gh);
76
77fail_holder_uninit:
78 sb_end_intwrite(sdp->sd_vfs);
79 gfs2_holder_uninit(&tr->tr_t_gh);
80 kfree(tr);
81
82 return error;
83}
84
85/**
86 * gfs2_log_release - Release a given number of log blocks
87 * @sdp: The GFS2 superblock
88 * @blks: The number of blocks
89 *
90 */
91
92static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
93{
94
95 atomic_add(blks, &sdp->sd_log_blks_free);
96 trace_gfs2_log_blocks(sdp, blks);
97 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
98 sdp->sd_jdesc->jd_blocks);
99 up_read(&sdp->sd_log_flush_lock);
100}
101
102static void gfs2_print_trans(const struct gfs2_trans *tr)
103{
104 pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip);
105 pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n",
106 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
107 pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
108 tr->tr_num_buf_new, tr->tr_num_buf_rm,
109 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
110 tr->tr_num_revoke, tr->tr_num_revoke_rm);
111}
112
113void gfs2_trans_end(struct gfs2_sbd *sdp)
114{
115 struct gfs2_trans *tr = current->journal_info;
116 s64 nbuf;
117 BUG_ON(!tr);
118 current->journal_info = NULL;
119
120 if (!tr->tr_touched) {
121 gfs2_log_release(sdp, tr->tr_reserved);
122 if (tr->tr_t_gh.gh_gl) {
123 gfs2_glock_dq(&tr->tr_t_gh);
124 gfs2_holder_uninit(&tr->tr_t_gh);
125 kfree(tr);
126 }
127 sb_end_intwrite(sdp->sd_vfs);
128 return;
129 }
130
131 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
132 nbuf -= tr->tr_num_buf_rm;
133 nbuf -= tr->tr_num_databuf_rm;
134
135 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
136 (tr->tr_num_revoke <= tr->tr_revokes)))
137 gfs2_print_trans(tr);
138
139 gfs2_log_commit(sdp, tr);
140 if (tr->tr_t_gh.gh_gl) {
141 gfs2_glock_dq(&tr->tr_t_gh);
142 gfs2_holder_uninit(&tr->tr_t_gh);
143 if (!tr->tr_attached)
144 kfree(tr);
145 }
146 up_read(&sdp->sd_log_flush_lock);
147
148 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
149 gfs2_log_flush(sdp, NULL);
150 sb_end_intwrite(sdp->sd_vfs);
151}
152
153static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
154 struct buffer_head *bh,
155 const struct gfs2_log_operations *lops)
156{
157 struct gfs2_bufdata *bd;
158
159 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
160 bd->bd_bh = bh;
161 bd->bd_gl = gl;
162 bd->bd_ops = lops;
163 INIT_LIST_HEAD(&bd->bd_list);
164 bh->b_private = bd;
165 return bd;
166}
167
168/**
169 * gfs2_trans_add_data - Add a databuf to the transaction.
170 * @gl: The inode glock associated with the buffer
171 * @bh: The buffer to add
172 *
173 * This is used in two distinct cases:
174 * i) In ordered write mode
175 * We put the data buffer on a list so that we can ensure that its
176 * synced to disk at the right time
177 * ii) In journaled data mode
178 * We need to journal the data block in the same way as metadata in
179 * the functions above. The difference is that here we have a tag
180 * which is two __be64's being the block number (as per meta data)
181 * and a flag which says whether the data block needs escaping or
182 * not. This means we need a new log entry for each 251 or so data
183 * blocks, which isn't an enormous overhead but twice as much as
184 * for normal metadata blocks.
185 */
186void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
187{
188 struct gfs2_trans *tr = current->journal_info;
189 struct gfs2_sbd *sdp = gl->gl_sbd;
190 struct address_space *mapping = bh->b_page->mapping;
191 struct gfs2_inode *ip = GFS2_I(mapping->host);
192 struct gfs2_bufdata *bd;
193
194 if (!gfs2_is_jdata(ip)) {
195 gfs2_ordered_add_inode(ip);
196 return;
197 }
198
199 lock_buffer(bh);
200 gfs2_log_lock(sdp);
201 bd = bh->b_private;
202 if (bd == NULL) {
203 gfs2_log_unlock(sdp);
204 unlock_buffer(bh);
205 if (bh->b_private == NULL)
206 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
207 lock_buffer(bh);
208 gfs2_log_lock(sdp);
209 }
210 gfs2_assert(sdp, bd->bd_gl == gl);
211 tr->tr_touched = 1;
212 if (list_empty(&bd->bd_list)) {
213 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
214 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
215 gfs2_pin(sdp, bd->bd_bh);
216 tr->tr_num_databuf_new++;
217 list_add_tail(&bd->bd_list, &tr->tr_databuf);
218 }
219 gfs2_log_unlock(sdp);
220 unlock_buffer(bh);
221}
222
223static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
224{
225 struct gfs2_meta_header *mh;
226 struct gfs2_trans *tr;
227
228 tr = current->journal_info;
229 tr->tr_touched = 1;
230 if (!list_empty(&bd->bd_list))
231 return;
232 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
233 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
234 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
235 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
236 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n",
237 (unsigned long long)bd->bd_bh->b_blocknr);
238 BUG();
239 }
240 gfs2_pin(sdp, bd->bd_bh);
241 mh->__pad0 = cpu_to_be64(0);
242 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
243 list_add(&bd->bd_list, &tr->tr_buf);
244 tr->tr_num_buf_new++;
245}
246
247void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
248{
249
250 struct gfs2_sbd *sdp = gl->gl_sbd;
251 struct gfs2_bufdata *bd;
252
253 lock_buffer(bh);
254 gfs2_log_lock(sdp);
255 bd = bh->b_private;
256 if (bd == NULL) {
257 gfs2_log_unlock(sdp);
258 unlock_buffer(bh);
259 lock_page(bh->b_page);
260 if (bh->b_private == NULL)
261 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
262 unlock_page(bh->b_page);
263 lock_buffer(bh);
264 gfs2_log_lock(sdp);
265 }
266 gfs2_assert(sdp, bd->bd_gl == gl);
267 meta_lo_add(sdp, bd);
268 gfs2_log_unlock(sdp);
269 unlock_buffer(bh);
270}
271
272void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
273{
274 struct gfs2_trans *tr = current->journal_info;
275
276 BUG_ON(!list_empty(&bd->bd_list));
277 gfs2_add_revoke(sdp, bd);
278 tr->tr_touched = 1;
279 tr->tr_num_revoke++;
280}
281
282void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
283{
284 struct gfs2_bufdata *bd, *tmp;
285 struct gfs2_trans *tr = current->journal_info;
286 unsigned int n = len;
287
288 gfs2_log_lock(sdp);
289 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
290 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
291 list_del_init(&bd->bd_list);
292 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
293 sdp->sd_log_num_revoke--;
294 kmem_cache_free(gfs2_bufdata_cachep, bd);
295 tr->tr_num_revoke_rm++;
296 if (--n == 0)
297 break;
298 }
299 }
300 gfs2_log_unlock(sdp);
301}
302
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