patch-2.4.25 linux-2.4.25/fs/xfs/xfs_log.h

• Lines: 194
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_log.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_log.h linux-2.4.25/fs/xfs/xfs_log.h
@@ -0,0 +1,193 @@
+/*
+ * 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__
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define LSN_FIELD_CYCLE(arch) (((arch)==ARCH_NOCONVERT)?1:0)
+#define LSN_FIELD_BLOCK(arch) (((arch)==ARCH_NOCONVERT)?0:1)
+#else
+#define LSN_FIELD_CYCLE(arch) (0)
+#define LSN_FIELD_BLOCK(arch) (1)
+#endif
+
+/* get lsn fields */
+
+#define CYCLE_LSN(lsn,arch) (INT_GET(((uint *)&(lsn))[LSN_FIELD_CYCLE(arch)], arch))
+#define BLOCK_LSN(lsn,arch) (INT_GET(((uint *)&(lsn))[LSN_FIELD_BLOCK(arch)], arch))
+/* this is used in a spot where we might otherwise double-endian-flip */
+#define CYCLE_LSN_NOCONV(lsn,arch) (((uint *)&(lsn))[LSN_FIELD_CYCLE(arch)])
+
+#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, xfs_arch_t arch)
+{
+	if (CYCLE_LSN(lsn1, arch) != CYCLE_LSN(lsn2, arch))
+		return (CYCLE_LSN(lsn1, arch)<CYCLE_LSN(lsn2, arch))? -999 : 999;
+
+	if (BLOCK_LSN(lsn1, arch) != BLOCK_LSN(lsn2, arch))
+		return (BLOCK_LSN(lsn1, arch)<BLOCK_LSN(lsn2, arch))? -999 : 999;
+
+	return 0;
+}
+
+#define	XFS_LSN_CMP_ARCH(x,y,arch)	_lsn_cmp(x, y, arch)
+#define	XFS_LSN_CMP(x,y) XFS_LSN_CMP_ARCH(x,y,ARCH_NOCONVERT)
+#define	XFS_LSN_DIFF_ARCH(x,y,arch)	_lsn_cmp(x, y, arch)
+#define	XFS_LSN_DIFF(x,y) XFS_LSN_DIFF_ARCH(x,y,ARCH_NOCONVERT)
+
+/*
+ * 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
+
+typedef struct xfs_log_iovec {
+	xfs_caddr_t		i_addr;		/* beginning address of region */
+	int		i_len;		/* length in bytes 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	  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);
+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__ */