1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) International Business Machines Corp., 2000-2002 4 */ 5 #ifndef _H_JFS_XTREE 6 #define _H_JFS_XTREE 7 8 /* 9 * jfs_xtree.h: extent allocation descriptor B+-tree manager 10 */ 11 12 #include "jfs_btree.h" 13 14 15 /* 16 * extent allocation descriptor (xad) 17 */ 18 typedef struct 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 */ 24 } xad_t; /* (16) */ 25 26 #define MAXXLEN ((1 << 24) - 1) 27 28 #define XTSLOTSIZE 16 29 #define L2XTSLOTSIZE 4 30 31 /* xad_t field construction */ 32 #define XADoffset(xad, offset64)\ 33 {\ 34 (xad)->off1 = ((u64)offset64) >> 32;\ 35 (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\ 36 } 37 #define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64) 38 #define XADlength(xad, length32) PXDlength(&(xad)->loc, length32) 39 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) 45 46 /* xad list */ 47 struct xadlist { 48 s16 maxnxad; 49 s16 nxad; 50 xad_t *xad; 51 }; 52 53 /* xad_t flags */ 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 */ 59 60 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 67 68 struct xtheader { 69 __le64 next; /* 8: */ 70 __le64 prev; /* 8: */ 71 72 u8 flag; /* 1: */ 73 u8 rsrvd1; /* 1: */ 74 __le16 nextindex; /* 2: next index = number of entries */ 75 __le16 maxentry; /* 2: max number of entries */ 76 __le16 rsrvd2; /* 2: */ 77 78 pxd_t self; /* 8: self */ 79 }; 80 81 /* 82 * xtree root (in inode): 83 */ 84 typedef union { 85 struct xtheader header; 86 xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */ 87 } xtroot_t; 88 89 /* 90 * xtree page: 91 */ 92 typedef union { 93 struct xtheader header; 94 xad_t xad[XTPAGEMAXSLOT]; /* 16 * maxentry: xad array */ 95 } xtpage_t; 96 97 /* 98 * external declaration 99 */ 100 extern int xtLookup(struct inode *ip, s64 lstart, s64 llen, 101 int *pflag, s64 * paddr, int *plen, int flag); 102 extern void xtInitRoot(tid_t tid, struct inode *ip); 103 extern int xtInsert(tid_t tid, struct inode *ip, 104 int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag); 105 extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen, 106 int flag); 107 extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad); 108 extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type); 109 extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size); 110 extern int xtAppend(tid_t tid, 111 struct inode *ip, int xflag, s64 xoff, int maxblocks, 112 int *xlenp, s64 * xaddrp, int flag); 113 #endif /* !_H_JFS_XTREE */ 114