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kernel-fxtec-pro1x/fs/xfs/xfs_log.h
David Chinner b911ca0472 [XFS] Sanitise xfs_log_force error checking. 
xfs_log_force() is declared to return an error, but we almost never check
it. We don't need to check it in most cases; if there's a log I/O error
then we'll be shutting down the filesystem anyway and that means we'll
catch the error somewhere else.

However, on certain calls we should be returning an error - sync
transactions, fsync, sync writes, etc. so this isn't a pure black and
white distinction. Hence make xfs_log_force() a void function that issues
a warning to the syslog on error, and call _xfs_log_force() in all the
places where we actually care about the error status returned.

SGI-PV: 980084
SGI-Modid: xfs-linux-melb:xfs-kern:30832a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
2008-04-18 12:02:20 +10:00

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/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#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) (((__be32 *)&(lsn))[0])
#ifdef __KERNEL__
/*
* By comparing each component, we don't have to worry about extra
* endian issues in treating two 32 bit numbers as one 64 bit number
*/
static inline 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_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
/*
* 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 */
#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
#define XLOG_VEC_SET_TYPE(vecp, t) ((vecp)->i_type = (t))
typedef struct xfs_log_iovec {
xfs_caddr_t i_addr; /* beginning address of region */
int i_len; /* length in bytes of region */
uint i_type; /* type of region */
} 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);
void xfs_log_force(struct xfs_mount *mp,
xfs_lsn_t lsn,
uint flags);
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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