GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / gfs2 / trans.c
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
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
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
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
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  */
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
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
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
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