1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) International Business Machines Corp., 2000-2002
9 * jfs_xtree.h: extent allocation descriptor B+-tree manager
12 #include "jfs_btree.h"
16 * extent allocation descriptor (xad)
19 __u8 flag; /* 1: flag */
20 __u8 rsvrd[2]; /* 2: reserved */
21 __u8 off1; /* 1: offset in unit of fsblksize */
22 __le32 off2; /* 4: offset in unit of fsblksize */
23 pxd_t loc; /* 8: length and address in unit of fsblksize */
26 #define MAXXLEN ((1 << 24) - 1)
29 #define L2XTSLOTSIZE 4
31 /* xad_t field construction */
32 #define XADoffset(xad, offset64)\
34 (xad)->off1 = ((u64)offset64) >> 32;\
35 (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
37 #define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)
38 #define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)
40 /* xad_t field extraction */
41 #define offsetXAD(xad)\
42 ( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
43 #define addressXAD(xad) addressPXD(&(xad)->loc)
44 #define lengthXAD(xad) lengthPXD(&(xad)->loc)
54 #define XAD_NEW 0x01 /* new */
55 #define XAD_EXTENDED 0x02 /* extended */
56 #define XAD_COMPRESSED 0x04 /* compressed with recorded length */
57 #define XAD_NOTRECORDED 0x08 /* allocated but not recorded */
58 #define XAD_COW 0x10 /* copy-on-write */
61 /* possible values for maxentry */
62 #define XTROOTINITSLOT_DIR 6
63 #define XTROOTINITSLOT 10
64 #define XTROOTMAXSLOT 18
65 #define XTPAGEMAXSLOT 256
66 #define XTENTRYSTART 2
78 __le16 nextindex; /* 2: next index = number of entries */
79 __le16 maxentry; /* 2: max number of entries */
80 __le16 rsrvd2; /* 2: */
82 pxd_t self; /* 8: self */
85 xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */
89 * external declaration
91 extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
92 int *pflag, s64 * paddr, int *plen, int flag);
93 extern void xtInitRoot(tid_t tid, struct inode *ip);
94 extern int xtInsert(tid_t tid, struct inode *ip,
95 int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
96 extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
98 extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
99 extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
100 extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
101 extern int xtAppend(tid_t tid,
102 struct inode *ip, int xflag, s64 xoff, int maxblocks,
103 int *xlenp, s64 * xaddrp, int flag);
104 #endif /* !_H_JFS_XTREE */