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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 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
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 = _RET_IP_;
48 tr->tr_blocks = blocks;
49 tr->tr_revokes = revokes;
50 tr->tr_reserved = 1;
51 tr->tr_alloced = 1;
52 if (blocks)
53 tr->tr_reserved += 6 + blocks;
54 if (revokes)
55 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
56 sizeof(u64));
57 INIT_LIST_HEAD(&tr->tr_databuf);
58 INIT_LIST_HEAD(&tr->tr_buf);
59
60 sb_start_intwrite(sdp->sd_vfs);
61
62 error = gfs2_log_reserve(sdp, tr->tr_reserved);
63 if (error)
64 goto fail;
65
66 current->journal_info = tr;
67
68 return 0;
69
70fail:
71 sb_end_intwrite(sdp->sd_vfs);
72 kfree(tr);
73
74 return error;
75}
76
77static void gfs2_print_trans(const struct gfs2_trans *tr)
78{
79 pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip);
80 pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n",
81 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
82 pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
83 tr->tr_num_buf_new, tr->tr_num_buf_rm,
84 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
85 tr->tr_num_revoke, tr->tr_num_revoke_rm);
86}
87
88void gfs2_trans_end(struct gfs2_sbd *sdp)
89{
90 struct gfs2_trans *tr = current->journal_info;
91 s64 nbuf;
92 int alloced = tr->tr_alloced;
93
94 BUG_ON(!tr);
95 current->journal_info = NULL;
96
97 if (!tr->tr_touched) {
98 gfs2_log_release(sdp, tr->tr_reserved);
99 if (alloced) {
100 kfree(tr);
101 sb_end_intwrite(sdp->sd_vfs);
102 }
103 return;
104 }
105
106 nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
107 nbuf -= tr->tr_num_buf_rm;
108 nbuf -= tr->tr_num_databuf_rm;
109
110 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
111 (tr->tr_num_revoke <= tr->tr_revokes)))
112 gfs2_print_trans(tr);
113
114 gfs2_log_commit(sdp, tr);
115 if (alloced && !tr->tr_attached)
116 kfree(tr);
117 up_read(&sdp->sd_log_flush_lock);
118
119 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
120 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
121 if (alloced)
122 sb_end_intwrite(sdp->sd_vfs);
123}
124
125static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
126 struct buffer_head *bh,
127 const struct gfs2_log_operations *lops)
128{
129 struct gfs2_bufdata *bd;
130
131 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
132 bd->bd_bh = bh;
133 bd->bd_gl = gl;
134 bd->bd_ops = lops;
135 INIT_LIST_HEAD(&bd->bd_list);
136 bh->b_private = bd;
137 return bd;
138}
139
140/**
141 * gfs2_trans_add_data - Add a databuf to the transaction.
142 * @gl: The inode glock associated with the buffer
143 * @bh: The buffer to add
144 *
145 * This is used in two distinct cases:
146 * i) In ordered write mode
147 * We put the data buffer on a list so that we can ensure that its
148 * synced to disk at the right time
149 * ii) In journaled data mode
150 * We need to journal the data block in the same way as metadata in
151 * the functions above. The difference is that here we have a tag
152 * which is two __be64's being the block number (as per meta data)
153 * and a flag which says whether the data block needs escaping or
154 * not. This means we need a new log entry for each 251 or so data
155 * blocks, which isn't an enormous overhead but twice as much as
156 * for normal metadata blocks.
157 */
158void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
159{
160 struct gfs2_trans *tr = current->journal_info;
161 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
162 struct address_space *mapping = bh->b_page->mapping;
163 struct gfs2_inode *ip = GFS2_I(mapping->host);
164 struct gfs2_bufdata *bd;
165
166 if (!gfs2_is_jdata(ip)) {
167 gfs2_ordered_add_inode(ip);
168 return;
169 }
170
171 lock_buffer(bh);
172 gfs2_log_lock(sdp);
173 bd = bh->b_private;
174 if (bd == NULL) {
175 gfs2_log_unlock(sdp);
176 unlock_buffer(bh);
177 if (bh->b_private == NULL)
178 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
179 else
180 bd = bh->b_private;
181 lock_buffer(bh);
182 gfs2_log_lock(sdp);
183 }
184 gfs2_assert(sdp, bd->bd_gl == gl);
185 tr->tr_touched = 1;
186 if (list_empty(&bd->bd_list)) {
187 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
188 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
189 gfs2_pin(sdp, bd->bd_bh);
190 tr->tr_num_databuf_new++;
191 list_add_tail(&bd->bd_list, &tr->tr_databuf);
192 }
193 gfs2_log_unlock(sdp);
194 unlock_buffer(bh);
195}
196
197static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
198{
199 struct gfs2_meta_header *mh;
200 struct gfs2_trans *tr;
201 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
202
203 tr = current->journal_info;
204 tr->tr_touched = 1;
205 if (!list_empty(&bd->bd_list))
206 return;
207 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
208 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
209 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
210 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
211 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n",
212 (unsigned long long)bd->bd_bh->b_blocknr);
213 BUG();
214 }
215 if (unlikely(state == SFS_FROZEN)) {
216 printk(KERN_INFO "GFS2:adding buf while frozen\n");
217 gfs2_assert_withdraw(sdp, 0);
218 }
219 gfs2_pin(sdp, bd->bd_bh);
220 mh->__pad0 = cpu_to_be64(0);
221 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
222 list_add(&bd->bd_list, &tr->tr_buf);
223 tr->tr_num_buf_new++;
224}
225
226void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
227{
228
229 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
230 struct gfs2_bufdata *bd;
231
232 lock_buffer(bh);
233 gfs2_log_lock(sdp);
234 bd = bh->b_private;
235 if (bd == NULL) {
236 gfs2_log_unlock(sdp);
237 unlock_buffer(bh);
238 lock_page(bh->b_page);
239 if (bh->b_private == NULL)
240 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
241 else
242 bd = bh->b_private;
243 unlock_page(bh->b_page);
244 lock_buffer(bh);
245 gfs2_log_lock(sdp);
246 }
247 gfs2_assert(sdp, bd->bd_gl == gl);
248 meta_lo_add(sdp, bd);
249 gfs2_log_unlock(sdp);
250 unlock_buffer(bh);
251}
252
253void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
254{
255 struct gfs2_trans *tr = current->journal_info;
256
257 BUG_ON(!list_empty(&bd->bd_list));
258 gfs2_add_revoke(sdp, bd);
259 tr->tr_touched = 1;
260 tr->tr_num_revoke++;
261}
262
263void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
264{
265 struct gfs2_bufdata *bd, *tmp;
266 struct gfs2_trans *tr = current->journal_info;
267 unsigned int n = len;
268
269 gfs2_log_lock(sdp);
270 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
271 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
272 list_del_init(&bd->bd_list);
273 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
274 sdp->sd_log_num_revoke--;
275 kmem_cache_free(gfs2_bufdata_cachep, bd);
276 tr->tr_num_revoke_rm++;
277 if (--n == 0)
278 break;
279 }
280 }
281 gfs2_log_unlock(sdp);
282}
283