xref: /openbmc/linux/fs/gfs2/trans.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 #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/gfs2_ondisk.h>
16 #include <linux/kallsyms.h>
17 #include <linux/lm_interface.h>
18 
19 #include "gfs2.h"
20 #include "incore.h"
21 #include "glock.h"
22 #include "log.h"
23 #include "lops.h"
24 #include "meta_io.h"
25 #include "trans.h"
26 #include "util.h"
27 
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 	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
38 	if (!tr)
39 		return -ENOMEM;
40 
41 	tr->tr_ip = (unsigned long)__builtin_return_address(0);
42 	tr->tr_blocks = blocks;
43 	tr->tr_revokes = revokes;
44 	tr->tr_reserved = 1;
45 	if (blocks)
46 		tr->tr_reserved += 6 + blocks;
47 	if (revokes)
48 		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
49 						   sizeof(u64));
50 	INIT_LIST_HEAD(&tr->tr_list_buf);
51 
52 	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
53 
54 	error = gfs2_glock_nq(&tr->tr_t_gh);
55 	if (error)
56 		goto fail_holder_uninit;
57 
58 	if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
59 		tr->tr_t_gh.gh_flags |= GL_NOCACHE;
60 		error = -EROFS;
61 		goto fail_gunlock;
62 	}
63 
64 	error = gfs2_log_reserve(sdp, tr->tr_reserved);
65 	if (error)
66 		goto fail_gunlock;
67 
68 	current->journal_info = tr;
69 
70 	return 0;
71 
72 fail_gunlock:
73 	gfs2_glock_dq(&tr->tr_t_gh);
74 
75 fail_holder_uninit:
76 	gfs2_holder_uninit(&tr->tr_t_gh);
77 	kfree(tr);
78 
79 	return error;
80 }
81 
82 void gfs2_trans_end(struct gfs2_sbd *sdp)
83 {
84 	struct gfs2_trans *tr = current->journal_info;
85 
86 	BUG_ON(!tr);
87 	current->journal_info = NULL;
88 
89 	if (!tr->tr_touched) {
90 		gfs2_log_release(sdp, tr->tr_reserved);
91 		gfs2_glock_dq(&tr->tr_t_gh);
92 		gfs2_holder_uninit(&tr->tr_t_gh);
93 		kfree(tr);
94 		return;
95 	}
96 
97 	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
98 		fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
99 		       tr->tr_num_buf, tr->tr_blocks);
100 		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
101 	}
102 	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
103 		fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
104 		       tr->tr_num_revoke, tr->tr_revokes);
105 		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
106 	}
107 
108 	gfs2_log_commit(sdp, tr);
109         gfs2_glock_dq(&tr->tr_t_gh);
110         gfs2_holder_uninit(&tr->tr_t_gh);
111         kfree(tr);
112 
113 	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
114 		gfs2_log_flush(sdp, NULL);
115 }
116 
117 void gfs2_trans_add_gl(struct gfs2_glock *gl)
118 {
119 	lops_add(gl->gl_sbd, &gl->gl_le);
120 }
121 
122 /**
123  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
124  * @gl: the glock the buffer belongs to
125  * @bh: The buffer to add
126  * @meta: True in the case of adding metadata
127  *
128  */
129 
130 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
131 {
132 	struct gfs2_sbd *sdp = gl->gl_sbd;
133 	struct gfs2_bufdata *bd;
134 
135 	bd = bh->b_private;
136 	if (bd)
137 		gfs2_assert(sdp, bd->bd_gl == gl);
138 	else {
139 		gfs2_attach_bufdata(gl, bh, meta);
140 		bd = bh->b_private;
141 	}
142 	lops_add(sdp, &bd->bd_le);
143 }
144 
145 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, u64 blkno)
146 {
147 	struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
148 					 GFP_NOFS | __GFP_NOFAIL);
149 	lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
150 	rv->rv_blkno = blkno;
151 	lops_add(sdp, &rv->rv_le);
152 }
153 
154 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno)
155 {
156 	struct gfs2_revoke *rv;
157 	int found = 0;
158 
159 	gfs2_log_lock(sdp);
160 
161 	list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
162 		if (rv->rv_blkno == blkno) {
163 			list_del(&rv->rv_le.le_list);
164 			gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
165 			sdp->sd_log_num_revoke--;
166 			found = 1;
167 			break;
168 		}
169 	}
170 
171 	gfs2_log_unlock(sdp);
172 
173 	if (found) {
174 		struct gfs2_trans *tr = current->journal_info;
175 		kfree(rv);
176 		tr->tr_num_revoke_rm++;
177 	}
178 }
179 
180 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
181 {
182 	lops_add(rgd->rd_sbd, &rgd->rd_le);
183 }
184 
185