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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         tr->tr_alloced = 1;
 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(const struct gfs2_trans *tr)
 78 {
 79         pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip);
 80         pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n",
 81                 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
 82         pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
 83                 tr->tr_num_buf_new, tr->tr_num_buf_rm,
 84                 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
 85                 tr->tr_num_revoke, tr->tr_num_revoke_rm);
 86 }
 87 
 88 void gfs2_trans_end(struct gfs2_sbd *sdp)
 89 {
 90         struct gfs2_trans *tr = current->journal_info;
 91         s64 nbuf;
 92         int alloced = tr->tr_alloced;
 93 
 94         BUG_ON(!tr);
 95         current->journal_info = NULL;
 96 
 97         if (!tr->tr_touched) {
 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(tr);
113 
114         gfs2_log_commit(sdp, tr);
115         if (alloced && !tr->tr_attached)
116                         kfree(tr);
117         up_read(&sdp->sd_log_flush_lock);
118 
119         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
120                 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
121         if (alloced)
122                 sb_end_intwrite(sdp->sd_vfs);
123 }
124 
125 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
126                                                struct buffer_head *bh,
127                                                const struct gfs2_log_operations *lops)
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         bd->bd_ops = lops;
135         INIT_LIST_HEAD(&bd->bd_list);
136         bh->b_private = bd;
137         return bd;
138 }
139 
140 /**
141  * gfs2_trans_add_data - Add a databuf to the transaction.
142  * @gl: The inode glock associated with the buffer
143  * @bh: The buffer to add
144  *
145  * This is used in two distinct cases:
146  * i) In ordered write mode
147  *    We put the data buffer on a list so that we can ensure that its
148  *    synced to disk at the right time
149  * ii) In journaled data mode
150  *    We need to journal the data block in the same way as metadata in
151  *    the functions above. The difference is that here we have a tag
152  *    which is two __be64's being the block number (as per meta data)
153  *    and a flag which says whether the data block needs escaping or
154  *    not. This means we need a new log entry for each 251 or so data
155  *    blocks, which isn't an enormous overhead but twice as much as
156  *    for normal metadata blocks.
157  */
158 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
159 {
160         struct gfs2_trans *tr = current->journal_info;
161         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
162         struct address_space *mapping = bh->b_page->mapping;
163         struct gfs2_inode *ip = GFS2_I(mapping->host);
164         struct gfs2_bufdata *bd;
165 
166         if (!gfs2_is_jdata(ip)) {
167                 gfs2_ordered_add_inode(ip);
168                 return;
169         }
170 
171         lock_buffer(bh);
172         gfs2_log_lock(sdp);
173         bd = bh->b_private;
174         if (bd == NULL) {
175                 gfs2_log_unlock(sdp);
176                 unlock_buffer(bh);
177                 if (bh->b_private == NULL)
178                         bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
179                 else
180                         bd = bh->b_private;
181                 lock_buffer(bh);
182                 gfs2_log_lock(sdp);
183         }
184         gfs2_assert(sdp, bd->bd_gl == gl);
185         tr->tr_touched = 1;
186         if (list_empty(&bd->bd_list)) {
187                 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
188                 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
189                 gfs2_pin(sdp, bd->bd_bh);
190                 tr->tr_num_databuf_new++;
191                 list_add_tail(&bd->bd_list, &tr->tr_databuf);
192         }
193         gfs2_log_unlock(sdp);
194         unlock_buffer(bh);
195 }
196 
197 static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
198 {
199         struct gfs2_meta_header *mh;
200         struct gfs2_trans *tr;
201         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
202 
203         tr = current->journal_info;
204         tr->tr_touched = 1;
205         if (!list_empty(&bd->bd_list))
206                 return;
207         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
208         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
209         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
210         if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
211                 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n",
212                        (unsigned long long)bd->bd_bh->b_blocknr);
213                 BUG();
214         }
215         if (unlikely(state == SFS_FROZEN)) {
216                 printk(KERN_INFO "GFS2:adding buf while frozen\n");
217                 gfs2_assert_withdraw(sdp, 0);
218         }
219         gfs2_pin(sdp, bd->bd_bh);
220         mh->__pad0 = cpu_to_be64(0);
221         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
222         list_add(&bd->bd_list, &tr->tr_buf);
223         tr->tr_num_buf_new++;
224 }
225 
226 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
227 {
228 
229         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
230         struct gfs2_bufdata *bd;
231 
232         lock_buffer(bh);
233         gfs2_log_lock(sdp);
234         bd = bh->b_private;
235         if (bd == NULL) {
236                 gfs2_log_unlock(sdp);
237                 unlock_buffer(bh);
238                 lock_page(bh->b_page);
239                 if (bh->b_private == NULL)
240                         bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
241                 else
242                         bd = bh->b_private;
243                 unlock_page(bh->b_page);
244                 lock_buffer(bh);
245                 gfs2_log_lock(sdp);
246         }
247         gfs2_assert(sdp, bd->bd_gl == gl);
248         meta_lo_add(sdp, bd);
249         gfs2_log_unlock(sdp);
250         unlock_buffer(bh);
251 }
252 
253 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
254 {
255         struct gfs2_trans *tr = current->journal_info;
256 
257         BUG_ON(!list_empty(&bd->bd_list));
258         gfs2_add_revoke(sdp, bd);
259         tr->tr_touched = 1;
260         tr->tr_num_revoke++;
261 }
262 
263 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
264 {
265         struct gfs2_bufdata *bd, *tmp;
266         struct gfs2_trans *tr = current->journal_info;
267         unsigned int n = len;
268 
269         gfs2_log_lock(sdp);
270         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
271                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
272                         list_del_init(&bd->bd_list);
273                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
274                         sdp->sd_log_num_revoke--;
275                         kmem_cache_free(gfs2_bufdata_cachep, bd);
276                         tr->tr_num_revoke_rm++;
277                         if (--n == 0)
278                                 break;
279                 }
280         }
281         gfs2_log_unlock(sdp);
282 }
283 
284 

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