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git.proxmox.com Git - mirror_ubuntu-artful-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 #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>
26 #include "trace_gfs2.h"
28 int gfs2_trans_begin(struct gfs2_sbd
*sdp
, unsigned int blocks
,
31 struct gfs2_trans
*tr
;
34 BUG_ON(current
->journal_info
);
35 BUG_ON(blocks
== 0 && revokes
== 0);
37 if (!test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
))
40 tr
= kzalloc(sizeof(struct gfs2_trans
), GFP_NOFS
);
44 tr
->tr_ip
= (unsigned long)__builtin_return_address(0);
45 tr
->tr_blocks
= blocks
;
46 tr
->tr_revokes
= revokes
;
49 tr
->tr_reserved
+= 6 + blocks
;
51 tr
->tr_reserved
+= gfs2_struct2blk(sdp
, revokes
,
53 gfs2_holder_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, 0, &tr
->tr_t_gh
);
55 error
= gfs2_glock_nq(&tr
->tr_t_gh
);
57 goto fail_holder_uninit
;
59 error
= gfs2_log_reserve(sdp
, tr
->tr_reserved
);
63 current
->journal_info
= tr
;
68 gfs2_glock_dq(&tr
->tr_t_gh
);
71 gfs2_holder_uninit(&tr
->tr_t_gh
);
78 * gfs2_log_release - Release a given number of log blocks
79 * @sdp: The GFS2 superblock
80 * @blks: The number of blocks
84 static void gfs2_log_release(struct gfs2_sbd
*sdp
, unsigned int blks
)
87 atomic_add(blks
, &sdp
->sd_log_blks_free
);
88 trace_gfs2_log_blocks(sdp
, blks
);
89 gfs2_assert_withdraw(sdp
, atomic_read(&sdp
->sd_log_blks_free
) <=
90 sdp
->sd_jdesc
->jd_blocks
);
91 up_read(&sdp
->sd_log_flush_lock
);
94 static void gfs2_print_trans(const struct gfs2_trans
*tr
)
96 print_symbol(KERN_WARNING
"GFS2: Transaction created at: %s\n", tr
->tr_ip
);
97 printk(KERN_WARNING
"GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n",
98 tr
->tr_blocks
, tr
->tr_revokes
, tr
->tr_reserved
, tr
->tr_touched
);
99 printk(KERN_WARNING
"GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
100 tr
->tr_num_buf_new
, tr
->tr_num_buf_rm
,
101 tr
->tr_num_databuf_new
, tr
->tr_num_databuf_rm
,
102 tr
->tr_num_revoke
, tr
->tr_num_revoke_rm
);
105 void gfs2_trans_end(struct gfs2_sbd
*sdp
)
107 struct gfs2_trans
*tr
= current
->journal_info
;
110 current
->journal_info
= NULL
;
112 if (!tr
->tr_touched
) {
113 gfs2_log_release(sdp
, tr
->tr_reserved
);
114 if (tr
->tr_t_gh
.gh_gl
) {
115 gfs2_glock_dq(&tr
->tr_t_gh
);
116 gfs2_holder_uninit(&tr
->tr_t_gh
);
122 nbuf
= tr
->tr_num_buf_new
+ tr
->tr_num_databuf_new
;
123 nbuf
-= tr
->tr_num_buf_rm
;
124 nbuf
-= tr
->tr_num_databuf_rm
;
126 if (gfs2_assert_withdraw(sdp
, (nbuf
<= tr
->tr_blocks
) &&
127 (tr
->tr_num_revoke
<= tr
->tr_revokes
)))
128 gfs2_print_trans(tr
);
130 gfs2_log_commit(sdp
, tr
);
131 if (tr
->tr_t_gh
.gh_gl
) {
132 gfs2_glock_dq(&tr
->tr_t_gh
);
133 gfs2_holder_uninit(&tr
->tr_t_gh
);
137 if (sdp
->sd_vfs
->s_flags
& MS_SYNCHRONOUS
)
138 gfs2_log_flush(sdp
, NULL
);
142 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
143 * @gl: the glock the buffer belongs to
144 * @bh: The buffer to add
145 * @meta: True in the case of adding metadata
149 void gfs2_trans_add_bh(struct gfs2_glock
*gl
, struct buffer_head
*bh
, int meta
)
151 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
152 struct gfs2_bufdata
*bd
;
156 gfs2_assert(sdp
, bd
->bd_gl
== gl
);
158 gfs2_attach_bufdata(gl
, bh
, meta
);
164 void gfs2_trans_add_revoke(struct gfs2_sbd
*sdp
, struct gfs2_bufdata
*bd
)
166 BUG_ON(!list_empty(&bd
->bd_list
));
167 BUG_ON(!list_empty(&bd
->bd_ail_st_list
));
168 BUG_ON(!list_empty(&bd
->bd_ail_gl_list
));
169 lops_init_le(bd
, &gfs2_revoke_lops
);
173 void gfs2_trans_add_unrevoke(struct gfs2_sbd
*sdp
, u64 blkno
, unsigned int len
)
175 struct gfs2_bufdata
*bd
, *tmp
;
176 struct gfs2_trans
*tr
= current
->journal_info
;
177 unsigned int n
= len
;
180 list_for_each_entry_safe(bd
, tmp
, &sdp
->sd_log_le_revoke
, bd_list
) {
181 if ((bd
->bd_blkno
>= blkno
) && (bd
->bd_blkno
< (blkno
+ len
))) {
182 list_del_init(&bd
->bd_list
);
183 gfs2_assert_withdraw(sdp
, sdp
->sd_log_num_revoke
);
184 sdp
->sd_log_num_revoke
--;
185 kmem_cache_free(gfs2_bufdata_cachep
, bd
);
186 tr
->tr_num_revoke_rm
++;
191 gfs2_log_unlock(sdp
);