cregit-Linux how code gets into the kernel

Release 4.10 fs/jfs/jfs_xtree.h

Directory: fs/jfs
/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 *
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will 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 to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef _H_JFS_XTREE

#define _H_JFS_XTREE

/*
 *      jfs_xtree.h: extent allocation descriptor B+-tree manager
 */

#include "jfs_btree.h"


/*
 *      extent allocation descriptor (xad)
 */

typedef struct xad {
	
__u8 flag;	/* 1: flag */
	
__u8 rsvrd[2];	/* 2: reserved */
	
__u8 off1;	/* 1: offset in unit of fsblksize */
	
__le32 off2;	/* 4: offset in unit of fsblksize */
	
pxd_t loc;	/* 8: length and address in unit of fsblksize */
} 
xad_t;			
/* (16) */


#define MAXXLEN		((1 << 24) - 1)


#define XTSLOTSIZE	16

#define L2XTSLOTSIZE	4

/* xad_t field construction */

#define XADoffset(xad, offset64)\
{\
        (xad)->off1 = ((u64)offset64) >> 32;\
        (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
}

#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)

#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)

/* xad_t field extraction */

#define offsetXAD(xad)\
	( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))

#define addressXAD(xad) addressPXD(&(xad)->loc)

#define lengthXAD(xad) lengthPXD(&(xad)->loc)

/* xad list */

struct xadlist {
	
s16 maxnxad;
	
s16 nxad;
	
xad_t *xad;
};

/* xad_t flags */

#define XAD_NEW		0x01	
/* new */

#define XAD_EXTENDED	0x02	
/* extended */

#define XAD_COMPRESSED	0x04	
/* compressed with recorded length */

#define XAD_NOTRECORDED 0x08	
/* allocated but not recorded */

#define XAD_COW		0x10	
/* copy-on-write */


/* possible values for maxentry */

#define XTROOTINITSLOT_DIR 6

#define XTROOTINITSLOT	10

#define XTROOTMAXSLOT	18

#define XTPAGEMAXSLOT	256

#define XTENTRYSTART	2

/*
 *      xtree page:
 */
typedef union {
	
struct xtheader {
		
__le64 next;	/* 8: */
		
__le64 prev;	/* 8: */

		
u8 flag;	/* 1: */
		
u8 rsrvd1;	/* 1: */
		
__le16 nextindex;	/* 2: next index = number of entries */
		
__le16 maxentry;	/* 2: max number of entries */
		
__le16 rsrvd2;	/* 2: */

		
pxd_t self;	/* 8: self */
	} 
header;		/* (32) */

	
xad_t xad[XTROOTMAXSLOT];	/* 16 * maxentry: xad array */
} 
xtpage_t;

/*
 *      external declaration
 */
extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
		    int *pflag, s64 * paddr, int *plen, int flag);
extern void xtInitRoot(tid_t tid, struct inode *ip);
extern int xtInsert(tid_t tid, struct inode *ip,
		    int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
		    int flag);
#ifdef _NOTYET
extern int xtTailgate(tid_t tid, struct inode *ip,
		      s64 xoff, int xlen, s64 xaddr, int flag);
#endif
extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
		    int flag);
extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
extern int xtRelocate(tid_t tid, struct inode *ip,
		      xad_t * oxad, s64 nxaddr, int xtype);
extern int xtAppend(tid_t tid,
		    struct inode *ip, int xflag, s64 xoff, int maxblocks,
		    int *xlenp, s64 * xaddrp, int flag);
#endif				/* !_H_JFS_XTREE */

Overall Contributors

PersonTokensPropCommitsCommitProp
dave kleikampdave kleikamp47097.31%685.71%
al viroal viro132.69%114.29%
Total483100.00%7100.00%
Directory: fs/jfs
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