ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / fs / jfs / jfs_xtree.h
blob08c0c749b986bd64e87265043ac5cf3b467ad2ac
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2002
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 #ifndef _H_JFS_XTREE
19 #define _H_JFS_XTREE
22 * jfs_xtree.h: extent allocation descriptor B+-tree manager
25 #include "jfs_btree.h"
29 * extent allocation descriptor (xad)
31 typedef struct xad {
32 unsigned flag:8; /* 1: flag */
33 unsigned rsvrd:16; /* 2: reserved */
34 unsigned off1:8; /* 1: offset in unit of fsblksize */
35 __le32 off2; /* 4: offset in unit of fsblksize */
36 unsigned len:24; /* 3: length in unit of fsblksize */
37 unsigned addr1:8; /* 1: address in unit of fsblksize */
38 __le32 addr2; /* 4: address in unit of fsblksize */
39 } xad_t; /* (16) */
41 #define MAXXLEN ((1 << 24) - 1)
43 #define XTSLOTSIZE 16
44 #define L2XTSLOTSIZE 4
46 /* xad_t field construction */
47 #define XADoffset(xad, offset64)\
49 (xad)->off1 = ((u64)offset64) >> 32;\
50 (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
52 #define XADaddress(xad, address64)\
54 (xad)->addr1 = ((u64)address64) >> 32;\
55 (xad)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
57 #define XADlength(xad, length32) (xad)->len = __cpu_to_le24(length32)
59 /* xad_t field extraction */
60 #define offsetXAD(xad)\
61 ( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
62 #define addressXAD(xad)\
63 ( ((s64)((xad)->addr1)) << 32 | __le32_to_cpu((xad)->addr2))
64 #define lengthXAD(xad) __le24_to_cpu((xad)->len)
66 /* xad list */
67 struct xadlist {
68 s16 maxnxad;
69 s16 nxad;
70 xad_t *xad;
73 /* xad_t flags */
74 #define XAD_NEW 0x01 /* new */
75 #define XAD_EXTENDED 0x02 /* extended */
76 #define XAD_COMPRESSED 0x04 /* compressed with recorded length */
77 #define XAD_NOTRECORDED 0x08 /* allocated but not recorded */
78 #define XAD_COW 0x10 /* copy-on-write */
81 /* possible values for maxentry */
82 #define XTROOTINITSLOT_DIR 6
83 #define XTROOTINITSLOT 10
84 #define XTROOTMAXSLOT 18
85 #define XTPAGEMAXSLOT 256
86 #define XTENTRYSTART 2
89 * xtree page:
91 typedef union {
92 struct xtheader {
93 __le64 next; /* 8: */
94 __le64 prev; /* 8: */
96 u8 flag; /* 1: */
97 u8 rsrvd1; /* 1: */
98 __le16 nextindex; /* 2: next index = number of entries */
99 __le16 maxentry; /* 2: max number of entries */
100 __le16 rsrvd2; /* 2: */
102 pxd_t self; /* 8: self */
103 } header; /* (32) */
105 xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */
106 } xtpage_t;
109 * external declaration
111 extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
112 int *pflag, s64 * paddr, int *plen, int flag);
113 extern void xtInitRoot(tid_t tid, struct inode *ip);
114 extern int xtInsert(tid_t tid, struct inode *ip,
115 int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
116 extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
117 int flag);
118 #ifdef _NOTYET
119 extern int xtTailgate(tid_t tid, struct inode *ip,
120 s64 xoff, int xlen, s64 xaddr, int flag);
121 #endif
122 extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
123 extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
124 int flag);
125 extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
126 extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
127 extern int xtRelocate(tid_t tid, struct inode *ip,
128 xad_t * oxad, s64 nxaddr, int xtype);
129 extern int xtAppend(tid_t tid,
130 struct inode *ip, int xflag, s64 xoff, int maxblocks,
131 int *xlenp, s64 * xaddrp, int flag);
132 #endif /* !_H_JFS_XTREE */