mirror of
https://github.com/torvalds/linux
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269 lines
6.6 KiB
C
269 lines
6.6 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_JFS_DTREE
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#define _H_JFS_DTREE
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/*
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* jfs_dtree.h: directory B+-tree manager
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*/
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#include "jfs_btree.h"
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typedef union {
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struct {
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tid_t tid;
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struct inode *ip;
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u32 ino;
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} leaf;
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pxd_t xd;
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} ddata_t;
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/*
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* entry segment/slot
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*
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* an entry consists of type dependent head/only segment/slot and
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* additional segments/slots linked vi next field;
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* N.B. last/only segment of entry is terminated by next = -1;
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*/
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/*
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* directory page slot
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*/
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struct dtslot {
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s8 next; /* 1: */
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s8 cnt; /* 1: */
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__le16 name[15]; /* 30: */
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}; /* (32) */
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#define DATASLOTSIZE 16
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#define L2DATASLOTSIZE 4
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#define DTSLOTSIZE 32
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#define L2DTSLOTSIZE 5
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#define DTSLOTHDRSIZE 2
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#define DTSLOTDATASIZE 30
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#define DTSLOTDATALEN 15
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/*
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* internal node entry head/only segment
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*/
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struct idtentry {
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pxd_t xd; /* 8: child extent descriptor */
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s8 next; /* 1: */
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u8 namlen; /* 1: */
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__le16 name[11]; /* 22: 2-byte aligned */
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}; /* (32) */
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#define DTIHDRSIZE 10
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#define DTIHDRDATALEN 11
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/* compute number of slots for entry */
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#define NDTINTERNAL(klen) (DIV_ROUND_UP((4 + (klen)), 15))
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/*
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* leaf node entry head/only segment
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*
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* For legacy filesystems, name contains 13 wchars -- no index field
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*/
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struct ldtentry {
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__le32 inumber; /* 4: 4-byte aligned */
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s8 next; /* 1: */
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u8 namlen; /* 1: */
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__le16 name[11]; /* 22: 2-byte aligned */
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__le32 index; /* 4: index into dir_table */
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}; /* (32) */
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#define DTLHDRSIZE 6
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#define DTLHDRDATALEN_LEGACY 13 /* Old (OS/2) format */
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#define DTLHDRDATALEN 11
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/*
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* dir_table used for directory traversal during readdir
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*/
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/*
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* Keep persistent index for directory entries
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*/
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#define DO_INDEX(INODE) (JFS_SBI((INODE)->i_sb)->mntflag & JFS_DIR_INDEX)
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/*
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* Maximum entry in inline directory table
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*/
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#define MAX_INLINE_DIRTABLE_ENTRY 13
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struct dir_table_slot {
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u8 rsrvd; /* 1: */
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u8 flag; /* 1: 0 if free */
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u8 slot; /* 1: slot within leaf page of entry */
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u8 addr1; /* 1: upper 8 bits of leaf page address */
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__le32 addr2; /* 4: lower 32 bits of leaf page address -OR-
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index of next entry when this entry was deleted */
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}; /* (8) */
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/*
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* flag values
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*/
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#define DIR_INDEX_VALID 1
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#define DIR_INDEX_FREE 0
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#define DTSaddress(dir_table_slot, address64)\
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{\
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(dir_table_slot)->addr1 = ((u64)address64) >> 32;\
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(dir_table_slot)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
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}
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#define addressDTS(dts)\
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( ((s64)((dts)->addr1)) << 32 | __le32_to_cpu((dts)->addr2) )
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/* compute number of slots for entry */
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#define NDTLEAF_LEGACY(klen) (DIV_ROUND_UP((2 + (klen)), 15))
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#define NDTLEAF NDTINTERNAL
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/*
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* directory root page (in-line in on-disk inode):
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*
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* cf. dtpage_t below.
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*/
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typedef union {
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struct {
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struct dasd DASD; /* 16: DASD limit/usage info */
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u8 flag; /* 1: */
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u8 nextindex; /* 1: next free entry in stbl */
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s8 freecnt; /* 1: free count */
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s8 freelist; /* 1: freelist header */
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__le32 idotdot; /* 4: parent inode number */
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s8 stbl[8]; /* 8: sorted entry index table */
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} header; /* (32) */
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struct dtslot slot[9];
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} dtroot_t;
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#define PARENT(IP) \
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(le32_to_cpu(JFS_IP(IP)->i_dtroot.header.idotdot))
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#define DTROOTMAXSLOT 9
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#define dtEmpty(IP) (JFS_IP(IP)->i_dtroot.header.nextindex == 0)
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/*
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* directory regular page:
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*
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* entry slot array of 32 byte slot
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*
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* sorted entry slot index table (stbl):
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* contiguous slots at slot specified by stblindex,
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* 1-byte per entry
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* 512 byte block: 16 entry tbl (1 slot)
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* 1024 byte block: 32 entry tbl (1 slot)
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* 2048 byte block: 64 entry tbl (2 slot)
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* 4096 byte block: 128 entry tbl (4 slot)
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*
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* data area:
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* 512 byte block: 16 - 2 = 14 slot
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* 1024 byte block: 32 - 2 = 30 slot
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* 2048 byte block: 64 - 3 = 61 slot
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* 4096 byte block: 128 - 5 = 123 slot
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*
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* N.B. index is 0-based; index fields refer to slot index
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* except nextindex which refers to entry index in stbl;
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* end of entry stot list or freelist is marked with -1.
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*/
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typedef union {
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struct {
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__le64 next; /* 8: next sibling */
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__le64 prev; /* 8: previous sibling */
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u8 flag; /* 1: */
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u8 nextindex; /* 1: next entry index in stbl */
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s8 freecnt; /* 1: */
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s8 freelist; /* 1: slot index of head of freelist */
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u8 maxslot; /* 1: number of slots in page slot[] */
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u8 stblindex; /* 1: slot index of start of stbl */
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u8 rsrvd[2]; /* 2: */
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pxd_t self; /* 8: self pxd */
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} header; /* (32) */
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struct dtslot slot[128];
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} dtpage_t;
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#define DTPAGEMAXSLOT 128
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#define DT8THPGNODEBYTES 512
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#define DT8THPGNODETSLOTS 1
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#define DT8THPGNODESLOTS 16
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#define DTQTRPGNODEBYTES 1024
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#define DTQTRPGNODETSLOTS 1
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#define DTQTRPGNODESLOTS 32
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#define DTHALFPGNODEBYTES 2048
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#define DTHALFPGNODETSLOTS 2
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#define DTHALFPGNODESLOTS 64
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#define DTFULLPGNODEBYTES 4096
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#define DTFULLPGNODETSLOTS 4
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#define DTFULLPGNODESLOTS 128
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#define DTENTRYSTART 1
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/* get sorted entry table of the page */
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#define DT_GETSTBL(p) ( ((p)->header.flag & BT_ROOT) ?\
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((dtroot_t *)(p))->header.stbl : \
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(s8 *)&(p)->slot[(p)->header.stblindex] )
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/*
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* Flags for dtSearch
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*/
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#define JFS_CREATE 1
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#define JFS_LOOKUP 2
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#define JFS_REMOVE 3
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#define JFS_RENAME 4
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/*
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* Maximum file offset for directories.
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*/
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#define DIREND INT_MAX
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/*
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* external declarations
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*/
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extern void dtInitRoot(tid_t tid, struct inode *ip, u32 idotdot);
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extern int dtSearch(struct inode *ip, struct component_name * key,
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ino_t * data, struct btstack * btstack, int flag);
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extern int dtInsert(tid_t tid, struct inode *ip, struct component_name * key,
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ino_t * ino, struct btstack * btstack);
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extern int dtDelete(tid_t tid, struct inode *ip, struct component_name * key,
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ino_t * data, int flag);
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extern int dtModify(tid_t tid, struct inode *ip, struct component_name * key,
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ino_t * orig_ino, ino_t new_ino, int flag);
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extern int jfs_readdir(struct file *file, struct dir_context *ctx);
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#endif /* !_H_JFS_DTREE */
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