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xfs_log.h
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1 /*
2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
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
7  * published by the Free Software Foundation.
8  *
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.
13  *
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
17  */
18 #ifndef __XFS_LOG_H__
19 #define __XFS_LOG_H__
20 
21 /* get lsn fields */
22 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
23 #define BLOCK_LSN(lsn) ((uint)(lsn))
24 
25 /* this is used in a spot where we might otherwise double-endian-flip */
26 #define CYCLE_LSN_DISK(lsn) (((__be32 *)&(lsn))[0])
27 
28 #ifdef __KERNEL__
29 /*
30  * By comparing each component, we don't have to worry about extra
31  * endian issues in treating two 32 bit numbers as one 64 bit number
32  */
33 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
34 {
35  if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
36  return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
37 
38  if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
39  return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
40 
41  return 0;
42 }
43 
44 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
45 
46 /*
47  * Macros, structures, prototypes for interface to the log manager.
48  */
49 
50 /*
51  * Flags to xfs_log_done()
52  */
53 #define XFS_LOG_REL_PERM_RESERV 0x1
54 
55 /*
56  * Flags to xfs_log_force()
57  *
58  * XFS_LOG_SYNC: Synchronous force in-core log to disk
59  */
60 #define XFS_LOG_SYNC 0x1
61 
62 #endif /* __KERNEL__ */
63 
64 
65 /* Log Clients */
66 #define XFS_TRANSACTION 0x69
67 #define XFS_VOLUME 0x2
68 #define XFS_LOG 0xaa
69 
70 
71 /* Region types for iovec's i_type */
72 #define XLOG_REG_TYPE_BFORMAT 1
73 #define XLOG_REG_TYPE_BCHUNK 2
74 #define XLOG_REG_TYPE_EFI_FORMAT 3
75 #define XLOG_REG_TYPE_EFD_FORMAT 4
76 #define XLOG_REG_TYPE_IFORMAT 5
77 #define XLOG_REG_TYPE_ICORE 6
78 #define XLOG_REG_TYPE_IEXT 7
79 #define XLOG_REG_TYPE_IBROOT 8
80 #define XLOG_REG_TYPE_ILOCAL 9
81 #define XLOG_REG_TYPE_IATTR_EXT 10
82 #define XLOG_REG_TYPE_IATTR_BROOT 11
83 #define XLOG_REG_TYPE_IATTR_LOCAL 12
84 #define XLOG_REG_TYPE_QFORMAT 13
85 #define XLOG_REG_TYPE_DQUOT 14
86 #define XLOG_REG_TYPE_QUOTAOFF 15
87 #define XLOG_REG_TYPE_LRHEADER 16
88 #define XLOG_REG_TYPE_UNMOUNT 17
89 #define XLOG_REG_TYPE_COMMIT 18
90 #define XLOG_REG_TYPE_TRANSHDR 19
91 #define XLOG_REG_TYPE_MAX 19
92 
93 typedef struct xfs_log_iovec {
94  void *i_addr; /* beginning address of region */
95  int i_len; /* length in bytes of region */
96  uint i_type; /* type of region */
97 } xfs_log_iovec_t;
98 
99 struct xfs_log_vec {
100  struct xfs_log_vec *lv_next; /* next lv in build list */
101  int lv_niovecs; /* number of iovecs in lv */
102  struct xfs_log_iovec *lv_iovecp; /* iovec array */
103  struct xfs_log_item *lv_item; /* owner */
104  char *lv_buf; /* formatted buffer */
105  int lv_buf_len; /* size of formatted buffer */
106 };
107 
108 /*
109  * Structure used to pass callback function and the function's argument
110  * to the log manager.
111  */
112 typedef struct xfs_log_callback {
113  struct xfs_log_callback *cb_next;
114  void (*cb_func)(void *, int);
115  void *cb_arg;
116 } xfs_log_callback_t;
117 
118 
119 #ifdef __KERNEL__
120 /* Log manager interfaces */
121 struct xfs_mount;
122 struct xlog_in_core;
123 struct xlog_ticket;
124 struct xfs_log_item;
125 struct xfs_item_ops;
126 struct xfs_trans;
127 
128 void xfs_log_item_init(struct xfs_mount *mp,
129  struct xfs_log_item *item,
130  int type,
131  const struct xfs_item_ops *ops);
132 
133 xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
134  struct xlog_ticket *ticket,
135  struct xlog_in_core **iclog,
136  uint flags);
137 int _xfs_log_force(struct xfs_mount *mp,
138  uint flags,
139  int *log_forced);
140 void xfs_log_force(struct xfs_mount *mp,
141  uint flags);
142 int _xfs_log_force_lsn(struct xfs_mount *mp,
143  xfs_lsn_t lsn,
144  uint flags,
145  int *log_forced);
146 void xfs_log_force_lsn(struct xfs_mount *mp,
147  xfs_lsn_t lsn,
148  uint flags);
149 int xfs_log_mount(struct xfs_mount *mp,
150  struct xfs_buftarg *log_target,
151  xfs_daddr_t start_block,
152  int num_bblocks);
153 int xfs_log_mount_finish(struct xfs_mount *mp);
154 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
155 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
156 void xfs_log_space_wake(struct xfs_mount *mp);
157 int xfs_log_notify(struct xfs_mount *mp,
158  struct xlog_in_core *iclog,
159  xfs_log_callback_t *callback_entry);
160 int xfs_log_release_iclog(struct xfs_mount *mp,
161  struct xlog_in_core *iclog);
162 int xfs_log_reserve(struct xfs_mount *mp,
163  int length,
164  int count,
165  struct xlog_ticket **ticket,
166  __uint8_t clientid,
167  bool permanent,
168  uint t_type);
169 int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
170 int xfs_log_unmount_write(struct xfs_mount *mp);
171 void xfs_log_unmount(struct xfs_mount *mp);
172 int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
173 int xfs_log_need_covered(struct xfs_mount *mp);
174 
175 void xlog_iodone(struct xfs_buf *);
176 
177 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
178 void xfs_log_ticket_put(struct xlog_ticket *ticket);
179 
180 int xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
181  xfs_lsn_t *commit_lsn, int flags);
182 bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
183 
184 #endif
185 #endif /* __XFS_LOG_H__ */
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