512f29d141
Reviewed by: pfg (mentor) Approved by: pfg (mentor) MFC after: 6 months Differential Revision: https://reviews.freebsd.org/D13810
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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
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* length<=EXT2FS_MAXNAMLEN */
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};
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struct ext2fs_direct_tail {
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uint32_t e2dt_reserved_zero1; /* pretend to be unused */
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uint16_t e2dt_rec_len; /* 12 */
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uint8_t e2dt_reserved_zero2; /* zero name length */
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uint8_t e2dt_reserved_ft; /* 0xDE, fake file type */
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uint32_t e2dt_checksum; /* crc32c(uuid+inum+dirblock) */
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};
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#define EXT2_FT_DIR_CSUM 0xDE
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#define EXT2_DIRENT_TAIL(data, blocksize) \
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((struct ext2fs_direct_tail *)(((char *)(data)) + \
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(blocksize) - sizeof(struct ext2fs_direct_tail)))
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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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#define EXT4_LINK_MAX 65000
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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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