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alistair23-linux/fs/xfs/xfs_log.h
Christoph Hellwig f538d4da8d [XFS] write barrier support Issue all log sync operations as ordered 
writes.  In addition flush the disk cache on fsync if the sync cached
operation didn't sync the log to disk (this requires some additional
bookeping in the transaction and log code). If the device doesn't claim to
support barriers, the filesystem has an extern log volume or the trial
superblock write with barriers enabled failed we disable barriers and
print a warning.  We should probably fail the mount completely, but that
could lead to nasty boot failures for the root filesystem.  Not enabled by
default yet, needs more destructive testing first.

SGI-PV: 912426
SGI-Modid: xfs-linux:xfs-kern:198723a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
2005-11-02 10:26:59 +11:00

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/*
* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_LOG_H__
#define __XFS_LOG_H__
/* get lsn fields */
#define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
#define BLOCK_LSN(lsn) ((uint)(lsn))
/* this is used in a spot where we might otherwise double-endian-flip */
#define CYCLE_LSN_DISK(lsn) (((uint *)&(lsn))[0])
#ifdef __KERNEL__
/*
* By comparing each compnent, we don't have to worry about extra
* endian issues in treating two 32 bit numbers as one 64 bit number
*/
static
#if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
__attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
#else
__inline__
#endif
xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
{
if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
return 0;
}
#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
/*
* Macros, structures, prototypes for interface to the log manager.
*/
/*
* Flags to xfs_log_mount
*/
#define XFS_LOG_RECOVER 0x1
/*
* Flags to xfs_log_done()
*/
#define XFS_LOG_REL_PERM_RESERV 0x1
/*
* Flags to xfs_log_reserve()
*
* XFS_LOG_SLEEP: If space is not available, sleep (default)
* XFS_LOG_NOSLEEP: If space is not available, return error
* XFS_LOG_PERM_RESERV: Permanent reservation. When writes are
* performed against this type of reservation, the reservation
* is not decreased. Long running transactions should use this.
*/
#define XFS_LOG_SLEEP 0x0
#define XFS_LOG_NOSLEEP 0x1
#define XFS_LOG_PERM_RESERV 0x2
#define XFS_LOG_RESV_ALL (XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)
/*
* Flags to xfs_log_force()
*
* XFS_LOG_SYNC: Synchronous force in-core log to disk
* XFS_LOG_FORCE: Start in-core log write now.
* XFS_LOG_URGE: Start write within some window of time.
*
* Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
*/
#define XFS_LOG_SYNC 0x1
#define XFS_LOG_FORCE 0x2
#define XFS_LOG_URGE 0x4
#endif /* __KERNEL__ */
/* Log Clients */
#define XFS_TRANSACTION 0x69
#define XFS_VOLUME 0x2
#define XFS_LOG 0xaa
/* Region types for iovec's i_type */
#if defined(XFS_LOG_RES_DEBUG)
#define XLOG_REG_TYPE_BFORMAT 1
#define XLOG_REG_TYPE_BCHUNK 2
#define XLOG_REG_TYPE_EFI_FORMAT 3
#define XLOG_REG_TYPE_EFD_FORMAT 4
#define XLOG_REG_TYPE_IFORMAT 5
#define XLOG_REG_TYPE_ICORE 6
#define XLOG_REG_TYPE_IEXT 7
#define XLOG_REG_TYPE_IBROOT 8
#define XLOG_REG_TYPE_ILOCAL 9
#define XLOG_REG_TYPE_IATTR_EXT 10
#define XLOG_REG_TYPE_IATTR_BROOT 11
#define XLOG_REG_TYPE_IATTR_LOCAL 12
#define XLOG_REG_TYPE_QFORMAT 13
#define XLOG_REG_TYPE_DQUOT 14
#define XLOG_REG_TYPE_QUOTAOFF 15
#define XLOG_REG_TYPE_LRHEADER 16
#define XLOG_REG_TYPE_UNMOUNT 17
#define XLOG_REG_TYPE_COMMIT 18
#define XLOG_REG_TYPE_TRANSHDR 19
#define XLOG_REG_TYPE_MAX 19
#endif
#if defined(XFS_LOG_RES_DEBUG)
#define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
#else
#define XLOG_VEC_SET_TYPE(vecp, t)
#endif
typedef struct xfs_log_iovec {
xfs_caddr_t i_addr; /* beginning address of region */
int i_len; /* length in bytes of region */
#if defined(XFS_LOG_RES_DEBUG)
uint i_type; /* type of region */
#endif
} xfs_log_iovec_t;
typedef void* xfs_log_ticket_t;
/*
* Structure used to pass callback function and the function's argument
* to the log manager.
*/
typedef struct xfs_log_callback {
struct xfs_log_callback *cb_next;
void (*cb_func)(void *, int);
void *cb_arg;
} xfs_log_callback_t;
#ifdef __KERNEL__
/* Log manager interfaces */
struct xfs_mount;
xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
xfs_log_ticket_t ticket,
void **iclog,
uint flags);
int _xfs_log_force(struct xfs_mount *mp,
xfs_lsn_t lsn,
uint flags,
int *log_forced);
#define xfs_log_force(mp, lsn, flags) \
_xfs_log_force(mp, lsn, flags, NULL);
int xfs_log_mount(struct xfs_mount *mp,
struct xfs_buftarg *log_target,
xfs_daddr_t start_block,
int num_bblocks);
int xfs_log_mount_finish(struct xfs_mount *mp, int);
void xfs_log_move_tail(struct xfs_mount *mp,
xfs_lsn_t tail_lsn);
int xfs_log_notify(struct xfs_mount *mp,
void *iclog,
xfs_log_callback_t *callback_entry);
int xfs_log_release_iclog(struct xfs_mount *mp,
void *iclog_hndl);
int xfs_log_reserve(struct xfs_mount *mp,
int length,
int count,
xfs_log_ticket_t *ticket,
__uint8_t clientid,
uint flags,
uint t_type);
int xfs_log_write(struct xfs_mount *mp,
xfs_log_iovec_t region[],
int nentries,
xfs_log_ticket_t ticket,
xfs_lsn_t *start_lsn);
int xfs_log_unmount(struct xfs_mount *mp);
int xfs_log_unmount_write(struct xfs_mount *mp);
void xfs_log_unmount_dealloc(struct xfs_mount *mp);
int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
int xfs_log_need_covered(struct xfs_mount *mp);
void xlog_iodone(struct xfs_buf *);
#endif
extern int xlog_debug; /* set to 1 to enable real log */
#endif /* __XFS_LOG_H__ */
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