91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/*
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* Copyright (c) 2007 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __EXT2_PRIV_H
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#define __EXT2_PRIV_H
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#include <lib/bio.h>
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#include <lib/bcache.h>
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#include "ext2_fs.h"
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typedef uint32_t blocknum_t;
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typedef uint32_t inodenum_t;
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typedef uint32_t groupnum_t;
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typedef struct {
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bdev_t *dev;
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bcache_t cache;
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struct ext2_super_block sb;
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int s_group_count;
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struct ext2_group_desc *gd;
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struct ext2_inode root_inode;
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} ext2_t;
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struct cache_block {
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blocknum_t num;
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void *ptr;
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};
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/* open file handle */
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typedef struct {
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ext2_t *ext2;
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struct cache_block ind_cache[3]; // cache of indirect blocks as they're scanned
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struct ext2_inode inode;
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} ext2_file_t;
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/* internal routines */
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int ext2_load_inode(ext2_t *ext2, inodenum_t num, struct ext2_inode *inode);
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int ext2_lookup(ext2_t *ext2, const char *path, inodenum_t *inum); // path to inode
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/* io */
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int ext2_read_block(ext2_t *ext2, void *buf, blocknum_t bnum);
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int ext2_get_block(ext2_t *ext2, void **ptr, blocknum_t bnum);
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int ext2_put_block(ext2_t *ext2, blocknum_t bnum);
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off_t ext2_file_len(ext2_t *ext2, struct ext2_inode *inode);
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int ext2_read_inode(ext2_t *ext2, struct ext2_inode *inode, void *buf, off_t offset, size_t len);
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int ext2_read_link(ext2_t *ext2, struct ext2_inode *inode, char *str, size_t len);
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/* mode stuff */
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#define S_IFMT 0170000
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#define S_IFIFO 0010000
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#define S_IFCHR 0020000
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#define S_IFDIR 0040000
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#define S_IFBLK 0060000
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#define S_IFREG 0100000
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#define S_IFLNK 0120000
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#define S_IFSOCK 0140000
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#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
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#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
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#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
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#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
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#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
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#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
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#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
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#endif
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