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 #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/kallsyms.h>
16 #include <linux/gfs2_ondisk.h>
27 #include "trace_gfs2.h"
29 int gfs2_trans_begin(struct gfs2_sbd
*sdp
, unsigned int blocks
,
32 struct gfs2_trans
*tr
;
35 BUG_ON(current
->journal_info
);
36 BUG_ON(blocks
== 0 && revokes
== 0);
38 if (!test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
))
41 tr
= kzalloc(sizeof(struct gfs2_trans
), GFP_NOFS
);
45 tr
->tr_ip
= (unsigned long)__builtin_return_address(0);
46 tr
->tr_blocks
= blocks
;
47 tr
->tr_revokes
= revokes
;
50 tr
->tr_reserved
+= 6 + blocks
;
52 tr
->tr_reserved
+= gfs2_struct2blk(sdp
, revokes
,
54 sb_start_intwrite(sdp
->sd_vfs
);
55 gfs2_holder_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, 0, &tr
->tr_t_gh
);
57 error
= gfs2_glock_nq(&tr
->tr_t_gh
);
59 goto fail_holder_uninit
;
61 error
= gfs2_log_reserve(sdp
, tr
->tr_reserved
);
65 current
->journal_info
= tr
;
70 gfs2_glock_dq(&tr
->tr_t_gh
);
73 sb_end_intwrite(sdp
->sd_vfs
);
74 gfs2_holder_uninit(&tr
->tr_t_gh
);
81 * gfs2_log_release - Release a given number of log blocks
82 * @sdp: The GFS2 superblock
83 * @blks: The number of blocks
87 static void gfs2_log_release(struct gfs2_sbd
*sdp
, unsigned int blks
)
90 atomic_add(blks
, &sdp
->sd_log_blks_free
);
91 trace_gfs2_log_blocks(sdp
, blks
);
92 gfs2_assert_withdraw(sdp
, atomic_read(&sdp
->sd_log_blks_free
) <=
93 sdp
->sd_jdesc
->jd_blocks
);
94 up_read(&sdp
->sd_log_flush_lock
);
97 static void gfs2_print_trans(const struct gfs2_trans
*tr
)
99 printk(KERN_WARNING
"GFS2: Transaction created at: %pSR\n",
101 printk(KERN_WARNING
"GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
102 tr
->tr_blocks
, tr
->tr_revokes
, tr
->tr_reserved
, tr
->tr_touched
);
103 printk(KERN_WARNING
"GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
104 tr
->tr_num_buf_new
, tr
->tr_num_buf_rm
,
105 tr
->tr_num_databuf_new
, tr
->tr_num_databuf_rm
,
106 tr
->tr_num_revoke
, tr
->tr_num_revoke_rm
);
109 void gfs2_trans_end(struct gfs2_sbd
*sdp
)
111 struct gfs2_trans
*tr
= current
->journal_info
;
114 current
->journal_info
= NULL
;
116 if (!tr
->tr_touched
) {
117 gfs2_log_release(sdp
, tr
->tr_reserved
);
118 if (tr
->tr_t_gh
.gh_gl
) {
119 gfs2_glock_dq(&tr
->tr_t_gh
);
120 gfs2_holder_uninit(&tr
->tr_t_gh
);
123 sb_end_intwrite(sdp
->sd_vfs
);
127 nbuf
= tr
->tr_num_buf_new
+ tr
->tr_num_databuf_new
;
128 nbuf
-= tr
->tr_num_buf_rm
;
129 nbuf
-= tr
->tr_num_databuf_rm
;
131 if (gfs2_assert_withdraw(sdp
, (nbuf
<= tr
->tr_blocks
) &&
132 (tr
->tr_num_revoke
<= tr
->tr_revokes
)))
133 gfs2_print_trans(tr
);
135 gfs2_log_commit(sdp
, tr
);
136 if (tr
->tr_t_gh
.gh_gl
) {
137 gfs2_glock_dq(&tr
->tr_t_gh
);
138 gfs2_holder_uninit(&tr
->tr_t_gh
);
139 if (!tr
->tr_attached
)
142 up_read(&sdp
->sd_log_flush_lock
);
144 if (sdp
->sd_vfs
->s_flags
& MS_SYNCHRONOUS
)
145 gfs2_log_flush(sdp
, NULL
);
146 sb_end_intwrite(sdp
->sd_vfs
);
149 static struct gfs2_bufdata
*gfs2_alloc_bufdata(struct gfs2_glock
*gl
,
150 struct buffer_head
*bh
,
151 const struct gfs2_log_operations
*lops
)
153 struct gfs2_bufdata
*bd
;
155 bd
= kmem_cache_zalloc(gfs2_bufdata_cachep
, GFP_NOFS
| __GFP_NOFAIL
);
159 INIT_LIST_HEAD(&bd
->bd_list
);
165 * gfs2_trans_add_data - Add a databuf to the transaction.
166 * @gl: The inode glock associated with the buffer
167 * @bh: The buffer to add
169 * This is used in two distinct cases:
170 * i) In ordered write mode
171 * We put the data buffer on a list so that we can ensure that its
172 * synced to disk at the right time
173 * ii) In journaled data mode
174 * We need to journal the data block in the same way as metadata in
175 * the functions above. The difference is that here we have a tag
176 * which is two __be64's being the block number (as per meta data)
177 * and a flag which says whether the data block needs escaping or
178 * not. This means we need a new log entry for each 251 or so data
179 * blocks, which isn't an enormous overhead but twice as much as
180 * for normal metadata blocks.
182 void gfs2_trans_add_data(struct gfs2_glock
*gl
, struct buffer_head
*bh
)
184 struct gfs2_trans
*tr
= current
->journal_info
;
185 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
186 struct address_space
*mapping
= bh
->b_page
->mapping
;
187 struct gfs2_inode
*ip
= GFS2_I(mapping
->host
);
188 struct gfs2_bufdata
*bd
;
190 if (!gfs2_is_jdata(ip
)) {
191 gfs2_ordered_add_inode(ip
);
199 gfs2_log_unlock(sdp
);
201 if (bh
->b_private
== NULL
)
202 bd
= gfs2_alloc_bufdata(gl
, bh
, &gfs2_databuf_lops
);
206 gfs2_assert(sdp
, bd
->bd_gl
== gl
);
208 if (list_empty(&bd
->bd_list
)) {
209 set_bit(GLF_LFLUSH
, &bd
->bd_gl
->gl_flags
);
210 set_bit(GLF_DIRTY
, &bd
->bd_gl
->gl_flags
);
211 gfs2_pin(sdp
, bd
->bd_bh
);
212 tr
->tr_num_databuf_new
++;
213 sdp
->sd_log_num_databuf
++;
214 list_add_tail(&bd
->bd_list
, &sdp
->sd_log_le_databuf
);
216 gfs2_log_unlock(sdp
);
220 static void meta_lo_add(struct gfs2_sbd
*sdp
, struct gfs2_bufdata
*bd
)
222 struct gfs2_meta_header
*mh
;
223 struct gfs2_trans
*tr
;
225 tr
= current
->journal_info
;
227 if (!list_empty(&bd
->bd_list
))
229 set_bit(GLF_LFLUSH
, &bd
->bd_gl
->gl_flags
);
230 set_bit(GLF_DIRTY
, &bd
->bd_gl
->gl_flags
);
231 mh
= (struct gfs2_meta_header
*)bd
->bd_bh
->b_data
;
232 if (unlikely(mh
->mh_magic
!= cpu_to_be32(GFS2_MAGIC
))) {
234 "Attempting to add uninitialised block to journal (inplace block=%lld)\n",
235 (unsigned long long)bd
->bd_bh
->b_blocknr
);
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 sdp
->sd_log_num_buf
++;
242 list_add(&bd
->bd_list
, &sdp
->sd_log_le_buf
);
243 tr
->tr_num_buf_new
++;
246 void gfs2_trans_add_meta(struct gfs2_glock
*gl
, struct buffer_head
*bh
)
249 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
250 struct gfs2_bufdata
*bd
;
256 gfs2_log_unlock(sdp
);
258 lock_page(bh
->b_page
);
259 if (bh
->b_private
== NULL
)
260 bd
= gfs2_alloc_bufdata(gl
, bh
, &gfs2_buf_lops
);
261 unlock_page(bh
->b_page
);
265 gfs2_assert(sdp
, bd
->bd_gl
== gl
);
266 meta_lo_add(sdp
, bd
);
267 gfs2_log_unlock(sdp
);
271 void gfs2_trans_add_revoke(struct gfs2_sbd
*sdp
, struct gfs2_bufdata
*bd
)
273 struct gfs2_glock
*gl
= bd
->bd_gl
;
274 struct gfs2_trans
*tr
= current
->journal_info
;
276 BUG_ON(!list_empty(&bd
->bd_list
));
277 BUG_ON(!list_empty(&bd
->bd_ail_st_list
));
278 BUG_ON(!list_empty(&bd
->bd_ail_gl_list
));
279 bd
->bd_ops
= &gfs2_revoke_lops
;
282 sdp
->sd_log_num_revoke
++;
283 atomic_inc(&gl
->gl_revokes
);
284 set_bit(GLF_LFLUSH
, &gl
->gl_flags
);
285 list_add(&bd
->bd_list
, &sdp
->sd_log_le_revoke
);
288 void gfs2_trans_add_unrevoke(struct gfs2_sbd
*sdp
, u64 blkno
, unsigned int len
)
290 struct gfs2_bufdata
*bd
, *tmp
;
291 struct gfs2_trans
*tr
= current
->journal_info
;
292 unsigned int n
= len
;
295 list_for_each_entry_safe(bd
, tmp
, &sdp
->sd_log_le_revoke
, bd_list
) {
296 if ((bd
->bd_blkno
>= blkno
) && (bd
->bd_blkno
< (blkno
+ len
))) {
297 list_del_init(&bd
->bd_list
);
298 gfs2_assert_withdraw(sdp
, sdp
->sd_log_num_revoke
);
299 sdp
->sd_log_num_revoke
--;
300 kmem_cache_free(gfs2_bufdata_cachep
, bd
);
301 tr
->tr_num_revoke_rm
++;
306 gfs2_log_unlock(sdp
);
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