Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of version 2 of the GNU General Public License as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it would be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 11 | * |
| 12 | * Further, this software is distributed without any warranty that it is |
| 13 | * free of the rightful claim of any third person regarding infringement |
| 14 | * or the like. Any license provided herein, whether implied or |
| 15 | * otherwise, applies only to this software file. Patent licenses, if |
| 16 | * any, provided herein do not apply to combinations of this program with |
| 17 | * other software, or any other product whatsoever. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write the Free Software Foundation, Inc., 59 |
| 21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 22 | * |
| 23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, |
| 24 | * Mountain View, CA 94043, or: |
| 25 | * |
| 26 | * http://www.sgi.com |
| 27 | * |
| 28 | * For further information regarding this notice, see: |
| 29 | * |
| 30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ |
| 31 | */ |
| 32 | #ifndef __XFS_LOG_H__ |
| 33 | #define __XFS_LOG_H__ |
| 34 | |
| 35 | /* get lsn fields */ |
| 36 | |
| 37 | #define CYCLE_LSN(lsn) ((uint)((lsn)>>32)) |
| 38 | #define BLOCK_LSN(lsn) ((uint)(lsn)) |
| 39 | /* this is used in a spot where we might otherwise double-endian-flip */ |
| 40 | #define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0]) |
| 41 | |
| 42 | #ifdef __KERNEL__ |
| 43 | /* |
| 44 | * By comparing each compnent, we don't have to worry about extra |
| 45 | * endian issues in treating two 32 bit numbers as one 64 bit number |
| 46 | */ |
| 47 | static |
| 48 | #if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96)) |
| 49 | __attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */ |
| 50 | #else |
| 51 | __inline__ |
| 52 | #endif |
| 53 | xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2) |
| 54 | { |
| 55 | if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2)) |
| 56 | return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999; |
| 57 | |
| 58 | if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2)) |
| 59 | return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999; |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y) |
| 65 | |
| 66 | /* |
| 67 | * Macros, structures, prototypes for interface to the log manager. |
| 68 | */ |
| 69 | |
| 70 | /* |
| 71 | * Flags to xfs_log_mount |
| 72 | */ |
| 73 | #define XFS_LOG_RECOVER 0x1 |
| 74 | |
| 75 | /* |
| 76 | * Flags to xfs_log_done() |
| 77 | */ |
| 78 | #define XFS_LOG_REL_PERM_RESERV 0x1 |
| 79 | |
| 80 | |
| 81 | /* |
| 82 | * Flags to xfs_log_reserve() |
| 83 | * |
| 84 | * XFS_LOG_SLEEP: If space is not available, sleep (default) |
| 85 | * XFS_LOG_NOSLEEP: If space is not available, return error |
| 86 | * XFS_LOG_PERM_RESERV: Permanent reservation. When writes are |
| 87 | * performed against this type of reservation, the reservation |
| 88 | * is not decreased. Long running transactions should use this. |
| 89 | */ |
| 90 | #define XFS_LOG_SLEEP 0x0 |
| 91 | #define XFS_LOG_NOSLEEP 0x1 |
| 92 | #define XFS_LOG_PERM_RESERV 0x2 |
| 93 | #define XFS_LOG_RESV_ALL (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV) |
| 94 | |
| 95 | |
| 96 | /* |
| 97 | * Flags to xfs_log_force() |
| 98 | * |
| 99 | * XFS_LOG_SYNC: Synchronous force in-core log to disk |
| 100 | * XFS_LOG_FORCE: Start in-core log write now. |
| 101 | * XFS_LOG_URGE: Start write within some window of time. |
| 102 | * |
| 103 | * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set. |
| 104 | */ |
| 105 | #define XFS_LOG_SYNC 0x1 |
| 106 | #define XFS_LOG_FORCE 0x2 |
| 107 | #define XFS_LOG_URGE 0x4 |
| 108 | |
| 109 | #endif /* __KERNEL__ */ |
| 110 | |
| 111 | |
| 112 | /* Log Clients */ |
| 113 | #define XFS_TRANSACTION 0x69 |
| 114 | #define XFS_VOLUME 0x2 |
| 115 | #define XFS_LOG 0xaa |
| 116 | |
| 117 | typedef struct xfs_log_iovec { |
| 118 | xfs_caddr_t i_addr; /* beginning address of region */ |
| 119 | int i_len; /* length in bytes of region */ |
| 120 | } xfs_log_iovec_t; |
| 121 | |
| 122 | typedef void* xfs_log_ticket_t; |
| 123 | |
| 124 | /* |
| 125 | * Structure used to pass callback function and the function's argument |
| 126 | * to the log manager. |
| 127 | */ |
| 128 | typedef struct xfs_log_callback { |
| 129 | struct xfs_log_callback *cb_next; |
| 130 | void (*cb_func)(void *, int); |
| 131 | void *cb_arg; |
| 132 | } xfs_log_callback_t; |
| 133 | |
| 134 | |
| 135 | #ifdef __KERNEL__ |
| 136 | /* Log manager interfaces */ |
| 137 | struct xfs_mount; |
| 138 | xfs_lsn_t xfs_log_done(struct xfs_mount *mp, |
| 139 | xfs_log_ticket_t ticket, |
| 140 | void **iclog, |
| 141 | uint flags); |
| 142 | int xfs_log_force(struct xfs_mount *mp, |
| 143 | xfs_lsn_t lsn, |
| 144 | uint flags); |
| 145 | int xfs_log_mount(struct xfs_mount *mp, |
| 146 | struct xfs_buftarg *log_target, |
| 147 | xfs_daddr_t start_block, |
| 148 | int num_bblocks); |
| 149 | int xfs_log_mount_finish(struct xfs_mount *mp, int); |
| 150 | void xfs_log_move_tail(struct xfs_mount *mp, |
| 151 | xfs_lsn_t tail_lsn); |
| 152 | int xfs_log_notify(struct xfs_mount *mp, |
| 153 | void *iclog, |
| 154 | xfs_log_callback_t *callback_entry); |
| 155 | int xfs_log_release_iclog(struct xfs_mount *mp, |
| 156 | void *iclog_hndl); |
| 157 | int xfs_log_reserve(struct xfs_mount *mp, |
| 158 | int length, |
| 159 | int count, |
| 160 | xfs_log_ticket_t *ticket, |
| 161 | __uint8_t clientid, |
| 162 | uint flags); |
| 163 | int xfs_log_write(struct xfs_mount *mp, |
| 164 | xfs_log_iovec_t region[], |
| 165 | int nentries, |
| 166 | xfs_log_ticket_t ticket, |
| 167 | xfs_lsn_t *start_lsn); |
| 168 | int xfs_log_unmount(struct xfs_mount *mp); |
| 169 | int xfs_log_unmount_write(struct xfs_mount *mp); |
| 170 | void xfs_log_unmount_dealloc(struct xfs_mount *mp); |
| 171 | int xfs_log_force_umount(struct xfs_mount *mp, int logerror); |
| 172 | int xfs_log_need_covered(struct xfs_mount *mp); |
| 173 | |
| 174 | void xlog_iodone(struct xfs_buf *); |
| 175 | |
| 176 | #endif |
| 177 | |
| 178 | |
| 179 | extern int xlog_debug; /* set to 1 to enable real log */ |
| 180 | |
| 181 | |
| 182 | #endif /* __XFS_LOG_H__ */ |