2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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.
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>
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);
44 tr->tr_ip = (unsigned long)__builtin_return_address(0);
45 tr->tr_blocks = blocks;
46 tr->tr_revokes = revokes;
49 tr->tr_reserved += 6 + blocks;
51 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
53 INIT_LIST_HEAD(&tr->tr_list_buf);
55 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
57 error = gfs2_glock_nq(&tr->tr_t_gh);
59 goto fail_holder_uninit;
61 error = gfs2_log_reserve(sdp, tr->tr_reserved);
65 current->journal_info = tr;
70 gfs2_glock_dq(&tr->tr_t_gh);
73 gfs2_holder_uninit(&tr->tr_t_gh);
80 * gfs2_log_release - Release a given number of log blocks
81 * @sdp: The GFS2 superblock
82 * @blks: The number of blocks
86 static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
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);
96 void gfs2_trans_end(struct gfs2_sbd *sdp)
98 struct gfs2_trans *tr = current->journal_info;
101 current->journal_info = NULL;
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);
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);
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);
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);
131 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
132 gfs2_log_flush(sdp, NULL);
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
143 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
145 struct gfs2_sbd *sdp = gl->gl_sbd;
146 struct gfs2_bufdata *bd;
152 gfs2_assert(sdp, bd->bd_gl == gl);
154 gfs2_log_unlock(sdp);
156 gfs2_attach_bufdata(gl, bh, meta);
161 lops_add(sdp, &bd->bd_le);
162 gfs2_log_unlock(sdp);
166 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
168 BUG_ON(!list_empty(&bd->bd_le.le_list));
169 BUG_ON(!list_empty(&bd->bd_ail_st_list));
170 BUG_ON(!list_empty(&bd->bd_ail_gl_list));
171 lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
172 lops_add(sdp, &bd->bd_le);
175 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
177 struct gfs2_bufdata *bd, *tmp;
178 struct gfs2_trans *tr = current->journal_info;
179 unsigned int n = len;
182 list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
183 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
184 list_del_init(&bd->bd_le.le_list);
185 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
186 sdp->sd_log_num_revoke--;
187 kmem_cache_free(gfs2_bufdata_cachep, bd);
188 tr->tr_num_revoke_rm++;
193 gfs2_log_unlock(sdp);