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