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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>
27 int gfs2_trans_begin(struct gfs2_sbd
*sdp
, unsigned int blocks
,
30 struct gfs2_trans
*tr
;
33 BUG_ON(current
->journal_info
);
34 BUG_ON(blocks
== 0 && revokes
== 0);
36 tr
= kzalloc(sizeof(struct gfs2_trans
), GFP_NOFS
);
40 tr
->tr_ip
= (unsigned long)__builtin_return_address(0);
41 tr
->tr_blocks
= blocks
;
42 tr
->tr_revokes
= revokes
;
45 tr
->tr_reserved
+= 6 + blocks
;
47 tr
->tr_reserved
+= gfs2_struct2blk(sdp
, revokes
,
49 INIT_LIST_HEAD(&tr
->tr_list_buf
);
51 gfs2_holder_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, 0, &tr
->tr_t_gh
);
53 error
= gfs2_glock_nq(&tr
->tr_t_gh
);
55 goto fail_holder_uninit
;
57 if (!test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
)) {
58 tr
->tr_t_gh
.gh_flags
|= GL_NOCACHE
;
63 error
= gfs2_log_reserve(sdp
, tr
->tr_reserved
);
67 current
->journal_info
= tr
;
72 gfs2_glock_dq(&tr
->tr_t_gh
);
75 gfs2_holder_uninit(&tr
->tr_t_gh
);
81 void gfs2_trans_end(struct gfs2_sbd
*sdp
)
83 struct gfs2_trans
*tr
= current
->journal_info
;
86 current
->journal_info
= NULL
;
88 if (!tr
->tr_touched
) {
89 gfs2_log_release(sdp
, tr
->tr_reserved
);
90 gfs2_glock_dq(&tr
->tr_t_gh
);
91 gfs2_holder_uninit(&tr
->tr_t_gh
);
96 if (gfs2_assert_withdraw(sdp
, tr
->tr_num_buf
<= tr
->tr_blocks
)) {
97 fs_err(sdp
, "tr_num_buf = %u, tr_blocks = %u ",
98 tr
->tr_num_buf
, tr
->tr_blocks
);
99 print_symbol(KERN_WARNING
"GFS2: Transaction created at: %s\n", tr
->tr_ip
);
101 if (gfs2_assert_withdraw(sdp
, tr
->tr_num_revoke
<= tr
->tr_revokes
)) {
102 fs_err(sdp
, "tr_num_revoke = %u, tr_revokes = %u ",
103 tr
->tr_num_revoke
, tr
->tr_revokes
);
104 print_symbol(KERN_WARNING
"GFS2: Transaction created at: %s\n", tr
->tr_ip
);
107 gfs2_log_commit(sdp
, tr
);
108 gfs2_glock_dq(&tr
->tr_t_gh
);
109 gfs2_holder_uninit(&tr
->tr_t_gh
);
112 if (sdp
->sd_vfs
->s_flags
& MS_SYNCHRONOUS
)
113 gfs2_log_flush(sdp
, NULL
);
117 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
118 * @gl: the glock the buffer belongs to
119 * @bh: The buffer to add
120 * @meta: True in the case of adding metadata
124 void gfs2_trans_add_bh(struct gfs2_glock
*gl
, struct buffer_head
*bh
, int meta
)
126 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
127 struct gfs2_bufdata
*bd
;
131 gfs2_assert(sdp
, bd
->bd_gl
== gl
);
133 gfs2_attach_bufdata(gl
, bh
, meta
);
136 lops_add(sdp
, &bd
->bd_le
);
139 void gfs2_trans_add_revoke(struct gfs2_sbd
*sdp
, struct gfs2_bufdata
*bd
)
141 BUG_ON(!list_empty(&bd
->bd_le
.le_list
));
142 BUG_ON(!list_empty(&bd
->bd_ail_st_list
));
143 BUG_ON(!list_empty(&bd
->bd_ail_gl_list
));
144 lops_init_le(&bd
->bd_le
, &gfs2_revoke_lops
);
145 lops_add(sdp
, &bd
->bd_le
);
148 void gfs2_trans_add_unrevoke(struct gfs2_sbd
*sdp
, u64 blkno
, unsigned int len
)
150 struct gfs2_bufdata
*bd
, *tmp
;
151 struct gfs2_trans
*tr
= current
->journal_info
;
152 unsigned int n
= len
;
155 list_for_each_entry_safe(bd
, tmp
, &sdp
->sd_log_le_revoke
, bd_le
.le_list
) {
156 if ((bd
->bd_blkno
>= blkno
) && (bd
->bd_blkno
< (blkno
+ len
))) {
157 list_del_init(&bd
->bd_le
.le_list
);
158 gfs2_assert_withdraw(sdp
, sdp
->sd_log_num_revoke
);
159 sdp
->sd_log_num_revoke
--;
160 kmem_cache_free(gfs2_bufdata_cachep
, bd
);
161 tr
->tr_num_revoke_rm
++;
166 gfs2_log_unlock(sdp
);
169 void gfs2_trans_add_rg(struct gfs2_rgrpd
*rgd
)
171 lops_add(rgd
->rd_sbd
, &rgd
->rd_le
);