91f5a4670f
This is a port of NetBSD's GSoC 2012 Ext3 HTree directory indexing by Vyacheslav Matyushin. It was cleaned up and enhanced for FreeBSD by Zheng Liu (lz@). This is an excellent example of work shared among different projects: Vyacheslav was able to look at an early prototype from Zheng Liu who was also able to check the code from Haiku (with permission). As in linux, the feature is not available by default and must be enabled explicitly with tune2fs. We still do not support the workarounds required in readdir for NFS. Submitted by: Zheng Liu Tested by: Mike Ma Sponsored by: Google Inc. MFC after: 1 week
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*-
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* Copyright (c) 2009 Aditya Sarawgi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _FS_EXT2FS_EXT2_DIR_H_
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#define _FS_EXT2FS_EXT2_DIR_H_
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/*
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* Structure of a directory entry
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*/
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#define EXT2FS_MAXNAMLEN 255
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struct ext2fs_direct {
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uint32_t e2d_ino; /* inode number of entry */
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uint16_t e2d_reclen; /* length of this record */
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uint16_t e2d_namlen; /* length of string in e2d_name */
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char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
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};
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enum slotstatus {
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NONE,
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COMPACT,
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FOUND
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};
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struct ext2fs_searchslot {
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enum slotstatus slotstatus;
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doff_t slotoffset; /* offset of area with free space */
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int slotsize; /* size of area at slotoffset */
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int slotfreespace; /* amount of space free in slot */
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int slotneeded; /* sizeof the entry we are seeking */
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};
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/*
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* The new version of the directory entry. Since EXT2 structures are
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* stored in intel byte order, and the name_len field could never be
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* bigger than 255 chars, it's safe to reclaim the extra byte for the
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* file_type field.
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*/
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struct ext2fs_direct_2 {
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uint32_t e2d_ino; /* inode number of entry */
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uint16_t e2d_reclen; /* length of this record */
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uint8_t e2d_namlen; /* length of string in e2d_name */
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uint8_t e2d_type; /* file type */
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char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
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};
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/*
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* Maximal count of links to a file
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*/
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#define EXT2_LINK_MAX 32000
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/*
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* Ext2 directory file types. Only the low 3 bits are used. The
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* other bits are reserved for now.
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*/
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#define EXT2_FT_UNKNOWN 0
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#define EXT2_FT_REG_FILE 1
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#define EXT2_FT_DIR 2
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#define EXT2_FT_CHRDEV 3
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#define EXT2_FT_BLKDEV 4
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#define EXT2_FT_FIFO 5
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#define EXT2_FT_SOCK 6
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#define EXT2_FT_SYMLINK 7
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#define EXT2_FT_MAX 8
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/*
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* EXT2_DIR_PAD defines the directory entries boundaries
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*
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* NOTE: It must be a multiple of 4
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*/
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#define EXT2_DIR_PAD 4
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#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
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#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
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~EXT2_DIR_ROUND)
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#endif /* !_FS_EXT2FS_EXT2_DIR_H_ */
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