xfs: Reduce allocations during CIL insertion
[deliverable/linux.git] / fs / xfs / xfs_log.h
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1da177e4 1/*
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2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
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5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
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7 * published by the Free Software Foundation.
8 *
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9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
1da177e4 13 *
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14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
18#ifndef __XFS_LOG_H__
19#define __XFS_LOG_H__
20
fc06c6d0 21#include "xfs_log_format.h"
b53e675d 22
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DC
23struct xfs_log_vec {
24 struct xfs_log_vec *lv_next; /* next lv in build list */
25 int lv_niovecs; /* number of iovecs in lv */
26 struct xfs_log_iovec *lv_iovecp; /* iovec array */
27 struct xfs_log_item *lv_item; /* owner */
28 char *lv_buf; /* formatted buffer */
29 int lv_buf_len; /* size of formatted buffer */
7492c5b4 30 int lv_size; /* size of allocated lv */
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DC
31};
32
33#define XFS_LOG_VEC_ORDERED (-1)
34
35/*
36 * Structure used to pass callback function and the function's argument
37 * to the log manager.
38 */
39typedef struct xfs_log_callback {
40 struct xfs_log_callback *cb_next;
41 void (*cb_func)(void *, int);
42 void *cb_arg;
43} xfs_log_callback_t;
1da177e4 44
1da177e4 45/*
c41564b5 46 * By comparing each component, we don't have to worry about extra
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47 * endian issues in treating two 32 bit numbers as one 64 bit number
48 */
a1365647 49static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
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50{
51 if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
52 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
53
54 if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
55 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
56
57 return 0;
58}
59
60#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
61
62/*
63 * Macros, structures, prototypes for interface to the log manager.
64 */
65
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66/*
67 * Flags to xfs_log_done()
68 */
69#define XFS_LOG_REL_PERM_RESERV 0x1
70
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71/*
72 * Flags to xfs_log_force()
73 *
74 * XFS_LOG_SYNC: Synchronous force in-core log to disk
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75 */
76#define XFS_LOG_SYNC 0x1
1da177e4 77
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78/* Log manager interfaces */
79struct xfs_mount;
35a8a72f 80struct xlog_in_core;
cc09c0dc 81struct xlog_ticket;
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DC
82struct xfs_log_item;
83struct xfs_item_ops;
955833cf 84struct xfs_trans;
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85
86void xfs_log_item_init(struct xfs_mount *mp,
87 struct xfs_log_item *item,
88 int type,
272e42b2 89 const struct xfs_item_ops *ops);
35a8a72f 90
1da177e4 91xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
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CH
92 struct xlog_ticket *ticket,
93 struct xlog_in_core **iclog,
1da177e4 94 uint flags);
f538d4da 95int _xfs_log_force(struct xfs_mount *mp,
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CH
96 uint flags,
97 int *log_forced);
b911ca04 98void xfs_log_force(struct xfs_mount *mp,
b911ca04 99 uint flags);
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CH
100int _xfs_log_force_lsn(struct xfs_mount *mp,
101 xfs_lsn_t lsn,
102 uint flags,
103 int *log_forced);
104void xfs_log_force_lsn(struct xfs_mount *mp,
105 xfs_lsn_t lsn,
106 uint flags);
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107int xfs_log_mount(struct xfs_mount *mp,
108 struct xfs_buftarg *log_target,
109 xfs_daddr_t start_block,
110 int num_bblocks);
4249023a 111int xfs_log_mount_finish(struct xfs_mount *mp);
09a423a3 112xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
1c304625 113xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
cfb7cdca 114void xfs_log_space_wake(struct xfs_mount *mp);
1da177e4 115int xfs_log_notify(struct xfs_mount *mp,
35a8a72f 116 struct xlog_in_core *iclog,
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117 xfs_log_callback_t *callback_entry);
118int xfs_log_release_iclog(struct xfs_mount *mp,
35a8a72f 119 struct xlog_in_core *iclog);
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120int xfs_log_reserve(struct xfs_mount *mp,
121 int length,
122 int count,
35a8a72f 123 struct xlog_ticket **ticket,
1da177e4 124 __uint8_t clientid,
9006fb91 125 bool permanent,
7e9c6396 126 uint t_type);
9006fb91 127int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
1da177e4 128int xfs_log_unmount_write(struct xfs_mount *mp);
21b699c8 129void xfs_log_unmount(struct xfs_mount *mp);
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130int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
131int xfs_log_need_covered(struct xfs_mount *mp);
132
133void xlog_iodone(struct xfs_buf *);
134
71e330b5 135struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
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136void xfs_log_ticket_put(struct xlog_ticket *ticket);
137
0244b960 138int xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
71e330b5 139 xfs_lsn_t *commit_lsn, int flags);
ccf7c23f 140bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
71e330b5 141
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DC
142void xfs_log_work_queue(struct xfs_mount *mp);
143void xfs_log_worker(struct work_struct *work);
c75921a7 144void xfs_log_quiesce(struct xfs_mount *mp);
f661f1e0 145
1da177e4 146#endif /* __XFS_LOG_H__ */
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