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TOMOYO Linux Cross Reference
Linux/fs/gfs2/trans.c

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  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 
 60         sb_start_intwrite(sdp->sd_vfs);
 61 
 62         error = gfs2_log_reserve(sdp, tr->tr_reserved);
 63         if (error)
 64                 goto fail;
 65 
 66         current->journal_info = tr;
 67 
 68         return 0;
 69 
 70 fail:
 71         sb_end_intwrite(sdp->sd_vfs);
 72         kfree(tr);
 73 
 74         return error;
 75 }
 76 
 77 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
 78 {
 79         fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
 80         fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
 81                 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
 82                 test_bit(TR_TOUCHED, &tr->tr_flags));
 83         fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
 84                 tr->tr_num_buf_new, tr->tr_num_buf_rm,
 85                 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
 86                 tr->tr_num_revoke, tr->tr_num_revoke_rm);
 87 }
 88 
 89 void gfs2_trans_end(struct gfs2_sbd *sdp)
 90 {
 91         struct gfs2_trans *tr = current->journal_info;
 92         s64 nbuf;
 93         int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
 94 
 95         current->journal_info = NULL;
 96 
 97         if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
 98                 gfs2_log_release(sdp, tr->tr_reserved);
 99                 if (alloced) {
100                         kfree(tr);
101                         sb_end_intwrite(sdp->sd_vfs);
102                 }
103                 return;
104         }
105 
106         nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
107         nbuf -= tr->tr_num_buf_rm;
108         nbuf -= tr->tr_num_databuf_rm;
109 
110         if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
111                                        (tr->tr_num_revoke <= tr->tr_revokes)))
112                 gfs2_print_trans(sdp, tr);
113 
114         gfs2_log_commit(sdp, tr);
115         if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
116                 kfree(tr);
117         up_read(&sdp->sd_log_flush_lock);
118 
119         if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
120                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
121                                GFS2_LFC_TRANS_END);
122         if (alloced)
123                 sb_end_intwrite(sdp->sd_vfs);
124 }
125 
126 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
127                                                struct buffer_head *bh)
128 {
129         struct gfs2_bufdata *bd;
130 
131         bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
132         bd->bd_bh = bh;
133         bd->bd_gl = gl;
134         INIT_LIST_HEAD(&bd->bd_list);
135         bh->b_private = bd;
136         return bd;
137 }
138 
139 /**
140  * gfs2_trans_add_data - Add a databuf to the transaction.
141  * @gl: The inode glock associated with the buffer
142  * @bh: The buffer to add
143  *
144  * This is used in journaled data mode.
145  * We need to journal the data block in the same way as metadata in
146  * the functions above. The difference is that here we have a tag
147  * which is two __be64's being the block number (as per meta data)
148  * and a flag which says whether the data block needs escaping or
149  * not. This means we need a new log entry for each 251 or so data
150  * blocks, which isn't an enormous overhead but twice as much as
151  * for normal metadata blocks.
152  */
153 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
154 {
155         struct gfs2_trans *tr = current->journal_info;
156         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
157         struct gfs2_bufdata *bd;
158 
159         lock_buffer(bh);
160         if (buffer_pinned(bh)) {
161                 set_bit(TR_TOUCHED, &tr->tr_flags);
162                 goto out;
163         }
164         gfs2_log_lock(sdp);
165         bd = bh->b_private;
166         if (bd == NULL) {
167                 gfs2_log_unlock(sdp);
168                 unlock_buffer(bh);
169                 if (bh->b_private == NULL)
170                         bd = gfs2_alloc_bufdata(gl, bh);
171                 else
172                         bd = bh->b_private;
173                 lock_buffer(bh);
174                 gfs2_log_lock(sdp);
175         }
176         gfs2_assert(sdp, bd->bd_gl == gl);
177         set_bit(TR_TOUCHED, &tr->tr_flags);
178         if (list_empty(&bd->bd_list)) {
179                 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
180                 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
181                 gfs2_pin(sdp, bd->bd_bh);
182                 tr->tr_num_databuf_new++;
183                 list_add_tail(&bd->bd_list, &tr->tr_databuf);
184         }
185         gfs2_log_unlock(sdp);
186 out:
187         unlock_buffer(bh);
188 }
189 
190 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
191 {
192 
193         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
194         struct gfs2_bufdata *bd;
195         struct gfs2_meta_header *mh;
196         struct gfs2_trans *tr = current->journal_info;
197         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
198 
199         lock_buffer(bh);
200         if (buffer_pinned(bh)) {
201                 set_bit(TR_TOUCHED, &tr->tr_flags);
202                 goto out;
203         }
204         gfs2_log_lock(sdp);
205         bd = bh->b_private;
206         if (bd == NULL) {
207                 gfs2_log_unlock(sdp);
208                 unlock_buffer(bh);
209                 lock_page(bh->b_page);
210                 if (bh->b_private == NULL)
211                         bd = gfs2_alloc_bufdata(gl, bh);
212                 else
213                         bd = bh->b_private;
214                 unlock_page(bh->b_page);
215                 lock_buffer(bh);
216                 gfs2_log_lock(sdp);
217         }
218         gfs2_assert(sdp, bd->bd_gl == gl);
219         set_bit(TR_TOUCHED, &tr->tr_flags);
220         if (!list_empty(&bd->bd_list))
221                 goto out_unlock;
222         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
223         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
224         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
225         if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
226                 fs_err(sdp, "Attempting to add uninitialised block to "
227                        "journal (inplace block=%lld)\n",
228                        (unsigned long long)bd->bd_bh->b_blocknr);
229                 BUG();
230         }
231         if (unlikely(state == SFS_FROZEN)) {
232                 fs_info(sdp, "GFS2:adding buf while frozen\n");
233                 gfs2_assert_withdraw(sdp, 0);
234         }
235         gfs2_pin(sdp, bd->bd_bh);
236         mh->__pad0 = cpu_to_be64(0);
237         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
238         list_add(&bd->bd_list, &tr->tr_buf);
239         tr->tr_num_buf_new++;
240 out_unlock:
241         gfs2_log_unlock(sdp);
242 out:
243         unlock_buffer(bh);
244 }
245 
246 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
247 {
248         struct gfs2_trans *tr = current->journal_info;
249 
250         BUG_ON(!list_empty(&bd->bd_list));
251         gfs2_add_revoke(sdp, bd);
252         set_bit(TR_TOUCHED, &tr->tr_flags);
253         tr->tr_num_revoke++;
254 }
255 
256 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
257 {
258         struct gfs2_bufdata *bd, *tmp;
259         struct gfs2_trans *tr = current->journal_info;
260         unsigned int n = len;
261 
262         gfs2_log_lock(sdp);
263         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
264                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
265                         list_del_init(&bd->bd_list);
266                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
267                         sdp->sd_log_num_revoke--;
268                         kmem_cache_free(gfs2_bufdata_cachep, bd);
269                         tr->tr_num_revoke_rm++;
270                         if (--n == 0)
271                                 break;
272                 }
273         }
274         gfs2_log_unlock(sdp);
275 }
276 
277 

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