183 lines
5.2 KiB
C
183 lines
5.2 KiB
C
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/*
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* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_LOG_H__
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#define __XFS_LOG_H__
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/* get lsn fields */
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#define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
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#define BLOCK_LSN(lsn) ((uint)(lsn))
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/* this is used in a spot where we might otherwise double-endian-flip */
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#define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])
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#ifdef __KERNEL__
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/*
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* By comparing each compnent, we don't have to worry about extra
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* endian issues in treating two 32 bit numbers as one 64 bit number
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*/
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static
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#if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
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__attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
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#else
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__inline__
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#endif
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xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
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{
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if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
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return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
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if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
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return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
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return 0;
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}
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#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
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/*
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* Macros, structures, prototypes for interface to the log manager.
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*/
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/*
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* Flags to xfs_log_mount
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*/
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#define XFS_LOG_RECOVER 0x1
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/*
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* Flags to xfs_log_done()
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*/
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#define XFS_LOG_REL_PERM_RESERV 0x1
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/*
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* Flags to xfs_log_reserve()
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*
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* XFS_LOG_SLEEP: If space is not available, sleep (default)
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* XFS_LOG_NOSLEEP: If space is not available, return error
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* XFS_LOG_PERM_RESERV: Permanent reservation. When writes are
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* performed against this type of reservation, the reservation
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* is not decreased. Long running transactions should use this.
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*/
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#define XFS_LOG_SLEEP 0x0
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#define XFS_LOG_NOSLEEP 0x1
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#define XFS_LOG_PERM_RESERV 0x2
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#define XFS_LOG_RESV_ALL (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
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/*
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* Flags to xfs_log_force()
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*
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* XFS_LOG_SYNC: Synchronous force in-core log to disk
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* XFS_LOG_FORCE: Start in-core log write now.
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* XFS_LOG_URGE: Start write within some window of time.
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*
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* Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
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*/
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#define XFS_LOG_SYNC 0x1
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#define XFS_LOG_FORCE 0x2
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#define XFS_LOG_URGE 0x4
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#endif /* __KERNEL__ */
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/* Log Clients */
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#define XFS_TRANSACTION 0x69
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#define XFS_VOLUME 0x2
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#define XFS_LOG 0xaa
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typedef struct xfs_log_iovec {
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xfs_caddr_t i_addr; /* beginning address of region */
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int i_len; /* length in bytes of region */
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} xfs_log_iovec_t;
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typedef void* xfs_log_ticket_t;
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/*
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* Structure used to pass callback function and the function's argument
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* to the log manager.
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*/
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typedef struct xfs_log_callback {
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struct xfs_log_callback *cb_next;
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void (*cb_func)(void *, int);
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void *cb_arg;
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} xfs_log_callback_t;
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#ifdef __KERNEL__
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/* Log manager interfaces */
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struct xfs_mount;
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xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
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xfs_log_ticket_t ticket,
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void **iclog,
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uint flags);
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int xfs_log_force(struct xfs_mount *mp,
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xfs_lsn_t lsn,
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uint flags);
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int xfs_log_mount(struct xfs_mount *mp,
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struct xfs_buftarg *log_target,
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xfs_daddr_t start_block,
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int num_bblocks);
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int xfs_log_mount_finish(struct xfs_mount *mp, int);
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void xfs_log_move_tail(struct xfs_mount *mp,
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xfs_lsn_t tail_lsn);
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int xfs_log_notify(struct xfs_mount *mp,
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void *iclog,
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xfs_log_callback_t *callback_entry);
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int xfs_log_release_iclog(struct xfs_mount *mp,
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void *iclog_hndl);
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int xfs_log_reserve(struct xfs_mount *mp,
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int length,
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int count,
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xfs_log_ticket_t *ticket,
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__uint8_t clientid,
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uint flags);
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int xfs_log_write(struct xfs_mount *mp,
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xfs_log_iovec_t region[],
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int nentries,
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xfs_log_ticket_t ticket,
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xfs_lsn_t *start_lsn);
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int xfs_log_unmount(struct xfs_mount *mp);
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int xfs_log_unmount_write(struct xfs_mount *mp);
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void xfs_log_unmount_dealloc(struct xfs_mount *mp);
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int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
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int xfs_log_need_covered(struct xfs_mount *mp);
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void xlog_iodone(struct xfs_buf *);
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#endif
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extern int xlog_debug; /* set to 1 to enable real log */
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#endif /* __XFS_LOG_H__ */
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