Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 set_bit(TR_ALLOCED, &tr->tr_flags);
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(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
78{
79 fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
80 fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
81 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
82 test_bit(TR_TOUCHED, &tr->tr_flags));
83 fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
84 tr->tr_num_buf_new, tr->tr_num_buf_rm,
85 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
86 tr->tr_num_revoke, tr->tr_num_revoke_rm);
87}
88
89void gfs2_trans_end(struct gfs2_sbd *sdp)
90{
91 struct gfs2_trans *tr = current->journal_info;
92 s64 nbuf;
93 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
94
95 current->journal_info = NULL;
96
97 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
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(sdp, tr);
113
114 gfs2_log_commit(sdp, tr);
115 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
116 kfree(tr);
117 up_read(&sdp->sd_log_flush_lock);
118
119 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
120 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
121 GFS2_LFC_TRANS_END);
122 if (alloced)
123 sb_end_intwrite(sdp->sd_vfs);
124}
125
126static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
127 struct buffer_head *bh)
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 INIT_LIST_HEAD(&bd->bd_list);
135 bh->b_private = bd;
136 return bd;
137}
138
139/**
140 * gfs2_trans_add_data - Add a databuf to the transaction.
141 * @gl: The inode glock associated with the buffer
142 * @bh: The buffer to add
143 *
144 * This is used in journaled data mode.
145 * We need to journal the data block in the same way as metadata in
146 * the functions above. The difference is that here we have a tag
147 * which is two __be64's being the block number (as per meta data)
148 * and a flag which says whether the data block needs escaping or
149 * not. This means we need a new log entry for each 251 or so data
150 * blocks, which isn't an enormous overhead but twice as much as
151 * for normal metadata blocks.
152 */
153void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
154{
155 struct gfs2_trans *tr = current->journal_info;
156 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
157 struct gfs2_bufdata *bd;
158
159 lock_buffer(bh);
160 if (buffer_pinned(bh)) {
161 set_bit(TR_TOUCHED, &tr->tr_flags);
162 goto out;
163 }
164 gfs2_log_lock(sdp);
165 bd = bh->b_private;
166 if (bd == NULL) {
167 gfs2_log_unlock(sdp);
168 unlock_buffer(bh);
169 if (bh->b_private == NULL)
170 bd = gfs2_alloc_bufdata(gl, bh);
171 else
172 bd = bh->b_private;
173 lock_buffer(bh);
174 gfs2_log_lock(sdp);
175 }
176 gfs2_assert(sdp, bd->bd_gl == gl);
177 set_bit(TR_TOUCHED, &tr->tr_flags);
178 if (list_empty(&bd->bd_list)) {
179 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
180 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
181 gfs2_pin(sdp, bd->bd_bh);
182 tr->tr_num_databuf_new++;
183 list_add_tail(&bd->bd_list, &tr->tr_databuf);
184 }
185 gfs2_log_unlock(sdp);
186out:
187 unlock_buffer(bh);
188}
189
190void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
191{
192
193 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
194 struct gfs2_bufdata *bd;
195 struct gfs2_meta_header *mh;
196 struct gfs2_trans *tr = current->journal_info;
197 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
198
199 lock_buffer(bh);
200 if (buffer_pinned(bh)) {
201 set_bit(TR_TOUCHED, &tr->tr_flags);
202 goto out;
203 }
204 gfs2_log_lock(sdp);
205 bd = bh->b_private;
206 if (bd == NULL) {
207 gfs2_log_unlock(sdp);
208 unlock_buffer(bh);
209 lock_page(bh->b_page);
210 if (bh->b_private == NULL)
211 bd = gfs2_alloc_bufdata(gl, bh);
212 else
213 bd = bh->b_private;
214 unlock_page(bh->b_page);
215 lock_buffer(bh);
216 gfs2_log_lock(sdp);
217 }
218 gfs2_assert(sdp, bd->bd_gl == gl);
219 set_bit(TR_TOUCHED, &tr->tr_flags);
220 if (!list_empty(&bd->bd_list))
221 goto out_unlock;
222 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
223 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
224 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
225 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
226 fs_err(sdp, "Attempting to add uninitialised block to "
227 "journal (inplace block=%lld)\n",
228 (unsigned long long)bd->bd_bh->b_blocknr);
229 BUG();
230 }
231 if (unlikely(state == SFS_FROZEN)) {
232 fs_info(sdp, "GFS2:adding buf while frozen\n");
233 gfs2_assert_withdraw(sdp, 0);
234 }
235 gfs2_pin(sdp, bd->bd_bh);
236 mh->__pad0 = cpu_to_be64(0);
237 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
238 list_add(&bd->bd_list, &tr->tr_buf);
239 tr->tr_num_buf_new++;
240out_unlock:
241 gfs2_log_unlock(sdp);
242out:
243 unlock_buffer(bh);
244}
245
246void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
247{
248 struct gfs2_trans *tr = current->journal_info;
249
250 BUG_ON(!list_empty(&bd->bd_list));
251 gfs2_add_revoke(sdp, bd);
252 set_bit(TR_TOUCHED, &tr->tr_flags);
253 tr->tr_num_revoke++;
254}
255
256void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
257{
258 struct gfs2_bufdata *bd, *tmp;
259 struct gfs2_trans *tr = current->journal_info;
260 unsigned int n = len;
261
262 gfs2_log_lock(sdp);
263 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
264 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
265 list_del_init(&bd->bd_list);
266 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
267 sdp->sd_log_num_revoke--;
268 kmem_cache_free(gfs2_bufdata_cachep, bd);
269 tr->tr_num_revoke_rm++;
270 if (--n == 0)
271 break;
272 }
273 }
274 gfs2_log_unlock(sdp);
275}
276