1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
26 #include "trace_gfs2.h"
28 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
31 struct gfs2_trans *tr;
34 BUG_ON(current->journal_info);
35 BUG_ON(blocks == 0 && revokes == 0);
37 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
40 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
45 tr->tr_blocks = blocks;
46 tr->tr_revokes = revokes;
48 set_bit(TR_ALLOCED, &tr->tr_flags);
50 tr->tr_reserved += 6 + blocks;
52 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
54 INIT_LIST_HEAD(&tr->tr_databuf);
55 INIT_LIST_HEAD(&tr->tr_buf);
57 sb_start_intwrite(sdp->sd_vfs);
59 error = gfs2_log_reserve(sdp, tr->tr_reserved);
63 current->journal_info = tr;
68 sb_end_intwrite(sdp->sd_vfs);
74 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
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,
86 void gfs2_trans_end(struct gfs2_sbd *sdp)
88 struct gfs2_trans *tr = current->journal_info;
90 int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
92 current->journal_info = NULL;
94 if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
95 gfs2_log_release(sdp, tr->tr_reserved);
98 sb_end_intwrite(sdp->sd_vfs);
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;
107 if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
108 (tr->tr_num_revoke <= tr->tr_revokes)))
109 gfs2_print_trans(sdp, tr);
111 gfs2_log_commit(sdp, tr);
112 if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
114 up_read(&sdp->sd_log_flush_lock);
116 if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
117 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
120 sb_end_intwrite(sdp->sd_vfs);
123 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
124 struct buffer_head *bh)
126 struct gfs2_bufdata *bd;
128 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
131 INIT_LIST_HEAD(&bd->bd_list);
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
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.
150 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
152 struct gfs2_trans *tr = current->journal_info;
153 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
154 struct gfs2_bufdata *bd;
157 if (buffer_pinned(bh)) {
158 set_bit(TR_TOUCHED, &tr->tr_flags);
164 gfs2_log_unlock(sdp);
166 if (bh->b_private == NULL)
167 bd = gfs2_alloc_bufdata(gl, bh);
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);
182 gfs2_log_unlock(sdp);
187 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
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);
197 if (buffer_pinned(bh)) {
198 set_bit(TR_TOUCHED, &tr->tr_flags);
204 gfs2_log_unlock(sdp);
206 lock_page(bh->b_page);
207 if (bh->b_private == NULL)
208 bd = gfs2_alloc_bufdata(gl, bh);
211 unlock_page(bh->b_page);
215 gfs2_assert(sdp, bd->bd_gl == gl);
216 set_bit(TR_TOUCHED, &tr->tr_flags);
217 if (!list_empty(&bd->bd_list))
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);
228 if (unlikely(state == SFS_FROZEN)) {
229 fs_info(sdp, "GFS2:adding buf while frozen\n");
230 gfs2_assert_withdraw(sdp, 0);
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++;
238 gfs2_log_unlock(sdp);
243 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
245 struct gfs2_trans *tr = current->journal_info;
247 BUG_ON(!list_empty(&bd->bd_list));
248 gfs2_add_revoke(sdp, bd);
249 set_bit(TR_TOUCHED, &tr->tr_flags);
253 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
255 struct gfs2_bufdata *bd, *tmp;
256 struct gfs2_trans *tr = current->journal_info;
257 unsigned int n = len;
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--;
266 gfs2_glock_remove_revoke(bd->bd_gl);
267 kmem_cache_free(gfs2_bufdata_cachep, bd);
273 gfs2_log_unlock(sdp);