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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
256 lines
5.9 KiB
C
256 lines
5.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) International Business Machines Corp., 2000-2002
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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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