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git.ipfire.org Git - people/arne_f/kernel.git/blob - fs/gfs2/trans.c
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
29 #include "trace_gfs2.h"
31 int gfs2_trans_begin(struct gfs2_sbd
*sdp
, unsigned int blocks
,
34 struct gfs2_trans
*tr
;
37 BUG_ON(current
->journal_info
);
38 BUG_ON(blocks
== 0 && revokes
== 0);
40 if (!test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
))
43 tr
= kzalloc(sizeof(struct gfs2_trans
), GFP_NOFS
);
48 tr
->tr_blocks
= blocks
;
49 tr
->tr_revokes
= revokes
;
51 set_bit(TR_ALLOCED
, &tr
->tr_flags
);
53 tr
->tr_reserved
+= 6 + blocks
;
55 tr
->tr_reserved
+= gfs2_struct2blk(sdp
, revokes
,
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
);
62 sb_start_intwrite(sdp
->sd_vfs
);
64 error
= gfs2_log_reserve(sdp
, tr
->tr_reserved
);
68 current
->journal_info
= tr
;
73 sb_end_intwrite(sdp
->sd_vfs
);
79 static void gfs2_print_trans(const struct gfs2_trans
*tr
)
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
);
91 void gfs2_trans_end(struct gfs2_sbd
*sdp
)
93 struct gfs2_trans
*tr
= current
->journal_info
;
95 int alloced
= test_bit(TR_ALLOCED
, &tr
->tr_flags
);
98 current
->journal_info
= NULL
;
100 if (!test_bit(TR_TOUCHED
, &tr
->tr_flags
)) {
101 gfs2_log_release(sdp
, tr
->tr_reserved
);
104 sb_end_intwrite(sdp
->sd_vfs
);
109 nbuf
= tr
->tr_num_buf_new
+ tr
->tr_num_databuf_new
;
110 nbuf
-= tr
->tr_num_buf_rm
;
111 nbuf
-= tr
->tr_num_databuf_rm
;
113 if (gfs2_assert_withdraw(sdp
, (nbuf
<= tr
->tr_blocks
) &&
114 (tr
->tr_num_revoke
<= tr
->tr_revokes
)))
115 gfs2_print_trans(tr
);
117 gfs2_log_commit(sdp
, tr
);
118 if (alloced
&& !test_bit(TR_ATTACHED
, &tr
->tr_flags
))
120 up_read(&sdp
->sd_log_flush_lock
);
122 if (sdp
->sd_vfs
->s_flags
& MS_SYNCHRONOUS
)
123 gfs2_log_flush(sdp
, NULL
, NORMAL_FLUSH
);
125 sb_end_intwrite(sdp
->sd_vfs
);
128 static struct gfs2_bufdata
*gfs2_alloc_bufdata(struct gfs2_glock
*gl
,
129 struct buffer_head
*bh
,
130 const struct gfs2_log_operations
*lops
)
132 struct gfs2_bufdata
*bd
;
134 bd
= kmem_cache_zalloc(gfs2_bufdata_cachep
, GFP_NOFS
| __GFP_NOFAIL
);
138 INIT_LIST_HEAD(&bd
->bd_list
);
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
148 * This is used in two distinct cases:
149 * i) In ordered write mode
150 * We put the data buffer on a list so that we can ensure that its
151 * synced to disk at the right time
152 * ii) In journaled data mode
153 * We need to journal the data block in the same way as metadata in
154 * the functions above. The difference is that here we have a tag
155 * which is two __be64's being the block number (as per meta data)
156 * and a flag which says whether the data block needs escaping or
157 * not. This means we need a new log entry for each 251 or so data
158 * blocks, which isn't an enormous overhead but twice as much as
159 * for normal metadata blocks.
161 void gfs2_trans_add_data(struct gfs2_glock
*gl
, struct buffer_head
*bh
)
163 struct gfs2_trans
*tr
= current
->journal_info
;
164 struct gfs2_sbd
*sdp
= gl
->gl_name
.ln_sbd
;
165 struct address_space
*mapping
= bh
->b_page
->mapping
;
166 struct gfs2_inode
*ip
= GFS2_I(mapping
->host
);
167 struct gfs2_bufdata
*bd
;
169 if (!gfs2_is_jdata(ip
)) {
170 gfs2_ordered_add_inode(ip
);
175 if (buffer_pinned(bh
)) {
176 set_bit(TR_TOUCHED
, &tr
->tr_flags
);
182 gfs2_log_unlock(sdp
);
184 if (bh
->b_private
== NULL
)
185 bd
= gfs2_alloc_bufdata(gl
, bh
, &gfs2_databuf_lops
);
191 gfs2_assert(sdp
, bd
->bd_gl
== gl
);
192 set_bit(TR_TOUCHED
, &tr
->tr_flags
);
193 if (list_empty(&bd
->bd_list
)) {
194 set_bit(GLF_LFLUSH
, &bd
->bd_gl
->gl_flags
);
195 set_bit(GLF_DIRTY
, &bd
->bd_gl
->gl_flags
);
196 gfs2_pin(sdp
, bd
->bd_bh
);
197 tr
->tr_num_databuf_new
++;
198 list_add_tail(&bd
->bd_list
, &tr
->tr_databuf
);
200 gfs2_log_unlock(sdp
);
205 void gfs2_trans_add_meta(struct gfs2_glock
*gl
, struct buffer_head
*bh
)
208 struct gfs2_sbd
*sdp
= gl
->gl_name
.ln_sbd
;
209 struct gfs2_bufdata
*bd
;
210 struct gfs2_meta_header
*mh
;
211 struct gfs2_trans
*tr
= current
->journal_info
;
212 enum gfs2_freeze_state state
= atomic_read(&sdp
->sd_freeze_state
);
215 if (buffer_pinned(bh
)) {
216 set_bit(TR_TOUCHED
, &tr
->tr_flags
);
222 gfs2_log_unlock(sdp
);
224 lock_page(bh
->b_page
);
225 if (bh
->b_private
== NULL
)
226 bd
= gfs2_alloc_bufdata(gl
, bh
, &gfs2_buf_lops
);
229 unlock_page(bh
->b_page
);
233 gfs2_assert(sdp
, bd
->bd_gl
== gl
);
234 set_bit(TR_TOUCHED
, &tr
->tr_flags
);
235 if (!list_empty(&bd
->bd_list
))
237 set_bit(GLF_LFLUSH
, &bd
->bd_gl
->gl_flags
);
238 set_bit(GLF_DIRTY
, &bd
->bd_gl
->gl_flags
);
239 mh
= (struct gfs2_meta_header
*)bd
->bd_bh
->b_data
;
240 if (unlikely(mh
->mh_magic
!= cpu_to_be32(GFS2_MAGIC
))) {
241 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n",
242 (unsigned long long)bd
->bd_bh
->b_blocknr
);
245 if (unlikely(state
== SFS_FROZEN
)) {
246 printk(KERN_INFO
"GFS2:adding buf while frozen\n");
247 gfs2_assert_withdraw(sdp
, 0);
249 gfs2_pin(sdp
, bd
->bd_bh
);
250 mh
->__pad0
= cpu_to_be64(0);
251 mh
->mh_jid
= cpu_to_be32(sdp
->sd_jdesc
->jd_jid
);
252 list_add(&bd
->bd_list
, &tr
->tr_buf
);
253 tr
->tr_num_buf_new
++;
255 gfs2_log_unlock(sdp
);
260 void gfs2_trans_add_revoke(struct gfs2_sbd
*sdp
, struct gfs2_bufdata
*bd
)
262 struct gfs2_trans
*tr
= current
->journal_info
;
264 BUG_ON(!list_empty(&bd
->bd_list
));
265 gfs2_add_revoke(sdp
, bd
);
266 set_bit(TR_TOUCHED
, &tr
->tr_flags
);
270 void gfs2_trans_add_unrevoke(struct gfs2_sbd
*sdp
, u64 blkno
, unsigned int len
)
272 struct gfs2_bufdata
*bd
, *tmp
;
273 struct gfs2_trans
*tr
= current
->journal_info
;
274 unsigned int n
= len
;
277 list_for_each_entry_safe(bd
, tmp
, &sdp
->sd_log_le_revoke
, bd_list
) {
278 if ((bd
->bd_blkno
>= blkno
) && (bd
->bd_blkno
< (blkno
+ len
))) {
279 list_del_init(&bd
->bd_list
);
280 gfs2_assert_withdraw(sdp
, sdp
->sd_log_num_revoke
);
281 sdp
->sd_log_num_revoke
--;
283 gfs2_glock_remove_revoke(bd
->bd_gl
);
284 kmem_cache_free(gfs2_bufdata_cachep
, bd
);
285 tr
->tr_num_revoke_rm
++;
290 gfs2_log_unlock(sdp
);