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
gfs2_trans_begin(struct gfs2_sbd * sdp,unsigned int blocks,unsigned int revokes)31 int 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 INIT_LIST_HEAD(&tr->tr_ail1_list);
60 INIT_LIST_HEAD(&tr->tr_ail2_list);
61
62 sb_start_intwrite(sdp->sd_vfs);
63
64 error = gfs2_log_reserve(sdp, tr->tr_reserved);
65 if (error)
66 goto fail;
67
68 current->journal_info = tr;
69
70 return 0;
71
72 fail:
73 sb_end_intwrite(sdp->sd_vfs);
74 kfree(tr);
75
76 return error;
77 }
78
gfs2_print_trans(const struct gfs2_trans * tr)79 static void gfs2_print_trans(const struct gfs2_trans *tr)
80 {
81 pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip);
82 pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n",
83 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
84 test_bit(TR_TOUCHED, &tr->tr_flags));
85 pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
86 tr->tr_num_buf_new, tr->tr_num_buf_rm,
87 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
88 tr->tr_num_revoke, tr->tr_num_revoke_rm);
89 }
90
gfs2_trans_end(struct gfs2_sbd * sdp)91 void 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 kfree(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(tr);
115
116 gfs2_log_commit(sdp, tr);
117 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
118 kfree(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
gfs2_alloc_bufdata(struct gfs2_glock * gl,struct buffer_head * bh,const struct gfs2_log_operations * lops)128 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
129 struct buffer_head *bh,
130 const struct gfs2_log_operations *lops)
131 {
132 struct gfs2_bufdata *bd;
133
134 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
135 bd->bd_bh = bh;
136 bd->bd_gl = gl;
137 bd->bd_ops = lops;
138 INIT_LIST_HEAD(&bd->bd_list);
139 bh->b_private = bd;
140 return bd;
141 }
142
143 /**
144 * gfs2_trans_add_data - Add a databuf to the transaction.
145 * @gl: The inode glock associated with the buffer
146 * @bh: The buffer to add
147 *
148 * This is used in journaled data mode.
149 * We need to journal the data block in the same way as metadata in
150 * the functions above. The difference is that here we have a tag
151 * which is two __be64's being the block number (as per meta data)
152 * and a flag which says whether the data block needs escaping or
153 * not. This means we need a new log entry for each 251 or so data
154 * blocks, which isn't an enormous overhead but twice as much as
155 * for normal metadata blocks.
156 */
gfs2_trans_add_data(struct gfs2_glock * gl,struct buffer_head * bh)157 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
158 {
159 struct gfs2_trans *tr = current->journal_info;
160 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
161 struct gfs2_bufdata *bd;
162
163 lock_buffer(bh);
164 if (buffer_pinned(bh)) {
165 set_bit(TR_TOUCHED, &tr->tr_flags);
166 goto out;
167 }
168 gfs2_log_lock(sdp);
169 bd = bh->b_private;
170 if (bd == NULL) {
171 gfs2_log_unlock(sdp);
172 unlock_buffer(bh);
173 if (bh->b_private == NULL)
174 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
175 else
176 bd = bh->b_private;
177 lock_buffer(bh);
178 gfs2_log_lock(sdp);
179 }
180 gfs2_assert(sdp, bd->bd_gl == gl);
181 set_bit(TR_TOUCHED, &tr->tr_flags);
182 if (list_empty(&bd->bd_list)) {
183 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
184 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
185 gfs2_pin(sdp, bd->bd_bh);
186 tr->tr_num_databuf_new++;
187 list_add_tail(&bd->bd_list, &tr->tr_databuf);
188 }
189 gfs2_log_unlock(sdp);
190 out:
191 unlock_buffer(bh);
192 }
193
gfs2_trans_add_meta(struct gfs2_glock * gl,struct buffer_head * bh)194 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
195 {
196
197 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
198 struct gfs2_bufdata *bd;
199 struct gfs2_meta_header *mh;
200 struct gfs2_trans *tr = current->journal_info;
201 enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
202
203 lock_buffer(bh);
204 if (buffer_pinned(bh)) {
205 set_bit(TR_TOUCHED, &tr->tr_flags);
206 goto out;
207 }
208 gfs2_log_lock(sdp);
209 bd = bh->b_private;
210 if (bd == NULL) {
211 gfs2_log_unlock(sdp);
212 unlock_buffer(bh);
213 lock_page(bh->b_page);
214 if (bh->b_private == NULL)
215 bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
216 else
217 bd = bh->b_private;
218 unlock_page(bh->b_page);
219 lock_buffer(bh);
220 gfs2_log_lock(sdp);
221 }
222 gfs2_assert(sdp, bd->bd_gl == gl);
223 set_bit(TR_TOUCHED, &tr->tr_flags);
224 if (!list_empty(&bd->bd_list))
225 goto out_unlock;
226 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
227 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
228 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
229 if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
230 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n",
231 (unsigned long long)bd->bd_bh->b_blocknr);
232 BUG();
233 }
234 if (unlikely(state == SFS_FROZEN)) {
235 printk(KERN_INFO "GFS2:adding buf while frozen\n");
236 gfs2_assert_withdraw(sdp, 0);
237 }
238 gfs2_pin(sdp, bd->bd_bh);
239 mh->__pad0 = cpu_to_be64(0);
240 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
241 list_add(&bd->bd_list, &tr->tr_buf);
242 tr->tr_num_buf_new++;
243 out_unlock:
244 gfs2_log_unlock(sdp);
245 out:
246 unlock_buffer(bh);
247 }
248
gfs2_trans_add_revoke(struct gfs2_sbd * sdp,struct gfs2_bufdata * bd)249 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
250 {
251 struct gfs2_trans *tr = current->journal_info;
252
253 BUG_ON(!list_empty(&bd->bd_list));
254 gfs2_add_revoke(sdp, bd);
255 set_bit(TR_TOUCHED, &tr->tr_flags);
256 tr->tr_num_revoke++;
257 }
258
gfs2_trans_add_unrevoke(struct gfs2_sbd * sdp,u64 blkno,unsigned int len)259 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
260 {
261 struct gfs2_bufdata *bd, *tmp;
262 struct gfs2_trans *tr = current->journal_info;
263 unsigned int n = len;
264
265 gfs2_log_lock(sdp);
266 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
267 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
268 list_del_init(&bd->bd_list);
269 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
270 sdp->sd_log_num_revoke--;
271 if (bd->bd_gl)
272 gfs2_glock_remove_revoke(bd->bd_gl);
273 kmem_cache_free(gfs2_bufdata_cachep, bd);
274 tr->tr_num_revoke_rm++;
275 if (--n == 0)
276 break;
277 }
278 }
279 gfs2_log_unlock(sdp);
280 }
281
282