743 lines
20 KiB
C
743 lines
20 KiB
C
/* minix.c - The minix filesystem, version 1 and 2. */
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/*
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* VasEBoot -- GRand Unified Bootloader
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* Copyright (C) 2004,2005,2006,2007,2008 Free Software Foundation, Inc.
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*
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* VasEBoot 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 3 of the License, or
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* (at your option) any later version.
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*
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* VasEBoot 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 the
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* 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 VasEBoot. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <VasEBoot/err.h>
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#include <VasEBoot/file.h>
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#include <VasEBoot/mm.h>
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#include <VasEBoot/misc.h>
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#include <VasEBoot/disk.h>
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#include <VasEBoot/dl.h>
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#include <VasEBoot/types.h>
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#include <VasEBoot/i18n.h>
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VasEBoot_MOD_LICENSE ("GPLv3+");
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#ifdef MODE_MINIX3
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#define VasEBoot_MINIX_MAGIC 0x4D5A
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#elif defined(MODE_MINIX2)
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#define VasEBoot_MINIX_MAGIC 0x2468
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#define VasEBoot_MINIX_MAGIC_30 0x2478
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#else
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#define VasEBoot_MINIX_MAGIC 0x137F
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#define VasEBoot_MINIX_MAGIC_30 0x138F
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#endif
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#define VasEBoot_MINIX_INODE_DIR_BLOCKS 7
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#define VasEBoot_MINIX_LOG2_BSIZE 1
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#define VasEBoot_MINIX_ROOT_INODE 1
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#define VasEBoot_MINIX_MAX_SYMLNK_CNT 8
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#define VasEBoot_MINIX_SBLOCK 2
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#define VasEBoot_MINIX_IFDIR 0040000U
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#define VasEBoot_MINIX_IFLNK 0120000U
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#ifdef MODE_BIGENDIAN
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#define VasEBoot_cpu_to_minix16_compile_time VasEBoot_cpu_to_be16_compile_time
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#define VasEBoot_minix_to_cpu16 VasEBoot_be_to_cpu16
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#define VasEBoot_minix_to_cpu32 VasEBoot_be_to_cpu32
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#else
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#define VasEBoot_cpu_to_minix16_compile_time VasEBoot_cpu_to_le16_compile_time
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#define VasEBoot_minix_to_cpu16 VasEBoot_le_to_cpu16
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#define VasEBoot_minix_to_cpu32 VasEBoot_le_to_cpu32
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#endif
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#if defined(MODE_MINIX2) || defined(MODE_MINIX3)
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typedef VasEBoot_uint32_t VasEBoot_minix_uintn_t;
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#define VasEBoot_minix_to_cpu_n VasEBoot_minix_to_cpu32
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#else
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typedef VasEBoot_uint16_t VasEBoot_minix_uintn_t;
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#define VasEBoot_minix_to_cpu_n VasEBoot_minix_to_cpu16
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#endif
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#ifdef MODE_MINIX3
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typedef VasEBoot_uint32_t VasEBoot_minix_ino_t;
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#define VasEBoot_minix_to_cpu_ino VasEBoot_minix_to_cpu32
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#else
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typedef VasEBoot_uint16_t VasEBoot_minix_ino_t;
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#define VasEBoot_minix_to_cpu_ino VasEBoot_minix_to_cpu16
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#endif
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#define VasEBoot_MINIX_INODE_SIZE(data) (VasEBoot_minix_to_cpu32 (data->inode.size))
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#define VasEBoot_MINIX_INODE_MODE(data) (VasEBoot_minix_to_cpu16 (data->inode.mode))
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#define VasEBoot_MINIX_INODE_DIR_ZONES(data,blk) (VasEBoot_minix_to_cpu_n \
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(data->inode.dir_zones[blk]))
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#define VasEBoot_MINIX_INODE_INDIR_ZONE(data) (VasEBoot_minix_to_cpu_n \
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(data->inode.indir_zone))
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#define VasEBoot_MINIX_INODE_DINDIR_ZONE(data) (VasEBoot_minix_to_cpu_n \
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(data->inode.double_indir_zone))
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#ifdef MODE_MINIX3
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struct VasEBoot_minix_sblock
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{
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VasEBoot_uint32_t inode_cnt;
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VasEBoot_uint16_t zone_cnt;
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VasEBoot_uint16_t inode_bmap_size;
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VasEBoot_uint16_t zone_bmap_size;
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VasEBoot_uint16_t first_data_zone;
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VasEBoot_uint16_t log2_zone_size;
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VasEBoot_uint16_t pad;
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VasEBoot_uint32_t max_file_size;
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VasEBoot_uint32_t zones;
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VasEBoot_uint16_t magic;
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VasEBoot_uint16_t pad2;
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VasEBoot_uint16_t block_size;
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VasEBoot_uint8_t disk_version;
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};
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#else
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struct VasEBoot_minix_sblock
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{
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VasEBoot_uint16_t inode_cnt;
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VasEBoot_uint16_t zone_cnt;
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VasEBoot_uint16_t inode_bmap_size;
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VasEBoot_uint16_t zone_bmap_size;
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VasEBoot_uint16_t first_data_zone;
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VasEBoot_uint16_t log2_zone_size;
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VasEBoot_uint32_t max_file_size;
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VasEBoot_uint16_t magic;
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};
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#endif
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#if defined(MODE_MINIX3) || defined(MODE_MINIX2)
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struct VasEBoot_minix_inode
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{
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VasEBoot_uint16_t mode;
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VasEBoot_uint16_t nlinks;
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VasEBoot_uint16_t uid;
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VasEBoot_uint16_t gid;
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VasEBoot_uint32_t size;
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VasEBoot_uint32_t atime;
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VasEBoot_uint32_t mtime;
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VasEBoot_uint32_t ctime;
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VasEBoot_uint32_t dir_zones[7];
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VasEBoot_uint32_t indir_zone;
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VasEBoot_uint32_t double_indir_zone;
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VasEBoot_uint32_t triple_indir_zone;
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};
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#else
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struct VasEBoot_minix_inode
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{
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VasEBoot_uint16_t mode;
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VasEBoot_uint16_t uid;
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VasEBoot_uint32_t size;
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VasEBoot_uint32_t mtime;
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VasEBoot_uint8_t gid;
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VasEBoot_uint8_t nlinks;
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VasEBoot_uint16_t dir_zones[7];
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VasEBoot_uint16_t indir_zone;
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VasEBoot_uint16_t double_indir_zone;
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};
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#endif
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#if defined(MODE_MINIX3)
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#define MAX_MINIX_FILENAME_SIZE 60
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#else
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#define MAX_MINIX_FILENAME_SIZE 30
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#endif
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/* Information about a "mounted" minix filesystem. */
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struct VasEBoot_minix_data
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{
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struct VasEBoot_minix_sblock sblock;
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struct VasEBoot_minix_inode inode;
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VasEBoot_uint32_t block_per_zone;
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VasEBoot_minix_ino_t ino;
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int linknest;
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VasEBoot_disk_t disk;
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int filename_size;
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VasEBoot_size_t block_size;
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};
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static VasEBoot_dl_t my_mod;
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static VasEBoot_err_t VasEBoot_minix_find_file (struct VasEBoot_minix_data *data,
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const char *path);
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#ifdef MODE_MINIX3
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static inline VasEBoot_disk_addr_t
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VasEBoot_minix_zone2sect (struct VasEBoot_minix_data *data, VasEBoot_minix_uintn_t zone)
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{
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return ((VasEBoot_disk_addr_t) zone) * data->block_size;
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}
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#else
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static inline VasEBoot_disk_addr_t
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VasEBoot_minix_zone2sect (struct VasEBoot_minix_data *data, VasEBoot_minix_uintn_t zone)
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{
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int log2_zonesz = (VasEBoot_MINIX_LOG2_BSIZE
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+ VasEBoot_minix_to_cpu16 (data->sblock.log2_zone_size));
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return (((VasEBoot_disk_addr_t) zone) << log2_zonesz);
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}
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#endif
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/* Read the block pointer in ZONE, on the offset NUM. */
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static VasEBoot_minix_uintn_t
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VasEBoot_get_indir (struct VasEBoot_minix_data *data,
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VasEBoot_minix_uintn_t zone,
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VasEBoot_minix_uintn_t num)
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{
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VasEBoot_minix_uintn_t indirn;
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VasEBoot_disk_read (data->disk,
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VasEBoot_minix_zone2sect(data, zone),
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sizeof (VasEBoot_minix_uintn_t) * num,
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sizeof (VasEBoot_minix_uintn_t), (char *) &indirn);
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return VasEBoot_minix_to_cpu_n (indirn);
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}
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static VasEBoot_minix_uintn_t
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VasEBoot_minix_get_file_block (struct VasEBoot_minix_data *data, unsigned int blk)
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{
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VasEBoot_minix_uintn_t indir;
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/* Direct block. */
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if (blk < VasEBoot_MINIX_INODE_DIR_BLOCKS)
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return VasEBoot_MINIX_INODE_DIR_ZONES (data, blk);
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/* Indirect block. */
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blk -= VasEBoot_MINIX_INODE_DIR_BLOCKS;
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if (blk < data->block_per_zone)
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{
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indir = VasEBoot_get_indir (data, VasEBoot_MINIX_INODE_INDIR_ZONE (data), blk);
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return indir;
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}
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/* Double indirect block. */
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blk -= data->block_per_zone;
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if (blk < (VasEBoot_uint64_t) data->block_per_zone * (VasEBoot_uint64_t) data->block_per_zone)
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{
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indir = VasEBoot_get_indir (data, VasEBoot_MINIX_INODE_DINDIR_ZONE (data),
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blk / data->block_per_zone);
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indir = VasEBoot_get_indir (data, indir, blk % data->block_per_zone);
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return indir;
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}
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#if defined (MODE_MINIX3) || defined (MODE_MINIX2)
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blk -= data->block_per_zone * data->block_per_zone;
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if (blk < ((VasEBoot_uint64_t) data->block_per_zone * (VasEBoot_uint64_t) data->block_per_zone
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* (VasEBoot_uint64_t) data->block_per_zone))
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{
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indir = VasEBoot_get_indir (data, VasEBoot_minix_to_cpu_n (data->inode.triple_indir_zone),
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(blk / data->block_per_zone) / data->block_per_zone);
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indir = VasEBoot_get_indir (data, indir, (blk / data->block_per_zone) % data->block_per_zone);
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indir = VasEBoot_get_indir (data, indir, blk % data->block_per_zone);
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return indir;
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}
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#endif
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/* This should never happen. */
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VasEBoot_error (VasEBoot_ERR_OUT_OF_RANGE, "file bigger than maximum size");
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return 0;
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}
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/* Read LEN bytes from the file described by DATA starting with byte
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POS. Return the amount of read bytes in READ. */
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static VasEBoot_ssize_t
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VasEBoot_minix_read_file (struct VasEBoot_minix_data *data,
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VasEBoot_disk_read_hook_t read_hook, void *read_hook_data,
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VasEBoot_off_t pos, VasEBoot_size_t len, char *buf)
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{
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VasEBoot_uint32_t i;
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VasEBoot_uint32_t blockcnt;
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VasEBoot_uint32_t posblock;
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VasEBoot_uint32_t blockoff;
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if (pos > VasEBoot_MINIX_INODE_SIZE (data))
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{
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VasEBoot_error (VasEBoot_ERR_OUT_OF_RANGE,
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N_("attempt to read past the end of file"));
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return -1;
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}
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/* Adjust len so it we can't read past the end of the file. */
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if (len + pos > VasEBoot_MINIX_INODE_SIZE (data))
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len = VasEBoot_MINIX_INODE_SIZE (data) - pos;
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if (len == 0)
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return 0;
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/* Files are at most 2G/4G - 1 bytes on minixfs. Avoid 64-bit division. */
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blockcnt = ((VasEBoot_uint32_t) ((len + pos - 1)
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>> VasEBoot_DISK_SECTOR_BITS)) / data->block_size + 1;
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posblock = (((VasEBoot_uint32_t) pos)
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/ (data->block_size << VasEBoot_DISK_SECTOR_BITS));
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blockoff = (((VasEBoot_uint32_t) pos)
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% (data->block_size << VasEBoot_DISK_SECTOR_BITS));
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for (i = posblock; i < blockcnt; i++)
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{
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VasEBoot_minix_uintn_t blknr;
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VasEBoot_uint64_t blockend = data->block_size << VasEBoot_DISK_SECTOR_BITS;
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VasEBoot_off_t skipfirst = 0;
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blknr = VasEBoot_minix_get_file_block (data, i);
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if (VasEBoot_errno)
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return -1;
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/* Last block. */
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if (i == blockcnt - 1)
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{
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/* len + pos < 4G (checked above), so it doesn't overflow. */
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blockend = (((VasEBoot_uint32_t) (len + pos))
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% (data->block_size << VasEBoot_DISK_SECTOR_BITS));
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if (!blockend)
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blockend = data->block_size << VasEBoot_DISK_SECTOR_BITS;
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}
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/* First block. */
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if (i == posblock)
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{
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skipfirst = blockoff;
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blockend -= skipfirst;
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}
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data->disk->read_hook = read_hook;
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data->disk->read_hook_data = read_hook_data;
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VasEBoot_disk_read (data->disk,
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VasEBoot_minix_zone2sect(data, blknr),
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skipfirst, blockend, buf);
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data->disk->read_hook = 0;
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if (VasEBoot_errno)
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return -1;
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buf += (data->block_size << VasEBoot_DISK_SECTOR_BITS) - skipfirst;
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}
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return len;
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}
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/* Read inode INO from the mounted filesystem described by DATA. This
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inode is used by default now. */
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static VasEBoot_err_t
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VasEBoot_minix_read_inode (struct VasEBoot_minix_data *data, VasEBoot_minix_ino_t ino)
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{
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struct VasEBoot_minix_sblock *sblock = &data->sblock;
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/* Block in which the inode is stored. */
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VasEBoot_disk_addr_t block;
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data->ino = ino;
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/* The first inode in minix is inode 1. */
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ino--;
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block = VasEBoot_minix_zone2sect (data,
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2 + VasEBoot_minix_to_cpu16 (sblock->inode_bmap_size)
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+ VasEBoot_minix_to_cpu16 (sblock->zone_bmap_size));
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block += ino / (VasEBoot_DISK_SECTOR_SIZE / sizeof (struct VasEBoot_minix_inode));
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int offs = (ino % (VasEBoot_DISK_SECTOR_SIZE
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/ sizeof (struct VasEBoot_minix_inode))
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* sizeof (struct VasEBoot_minix_inode));
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VasEBoot_disk_read (data->disk, block, offs,
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sizeof (struct VasEBoot_minix_inode), &data->inode);
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return VasEBoot_ERR_NONE;
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}
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||
|
||
|
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/* Lookup the symlink the current inode points to. INO is the inode
|
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number of the directory the symlink is relative to. */
|
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static VasEBoot_err_t
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VasEBoot_minix_lookup_symlink (struct VasEBoot_minix_data *data, VasEBoot_minix_ino_t ino)
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{
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char *symlink;
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VasEBoot_size_t sz = VasEBoot_MINIX_INODE_SIZE (data);
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if (++data->linknest > VasEBoot_MINIX_MAX_SYMLNK_CNT)
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return VasEBoot_error (VasEBoot_ERR_SYMLINK_LOOP, N_("too deep nesting of symlinks"));
|
||
|
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symlink = VasEBoot_malloc (sz + 1);
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if (!symlink)
|
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return VasEBoot_errno;
|
||
if (VasEBoot_minix_read_file (data, 0, 0, 0, sz, symlink) < 0)
|
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return VasEBoot_errno;
|
||
|
||
symlink[sz] = '\0';
|
||
|
||
/* The symlink is an absolute path, go back to the root inode. */
|
||
if (symlink[0] == '/')
|
||
ino = VasEBoot_MINIX_ROOT_INODE;
|
||
|
||
/* Now load in the old inode. */
|
||
if (VasEBoot_minix_read_inode (data, ino))
|
||
return VasEBoot_errno;
|
||
|
||
VasEBoot_minix_find_file (data, symlink);
|
||
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
|
||
/* Find the file with the pathname PATH on the filesystem described by
|
||
DATA. */
|
||
static VasEBoot_err_t
|
||
VasEBoot_minix_find_file (struct VasEBoot_minix_data *data, const char *path)
|
||
{
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||
const char *name;
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const char *next = path;
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||
unsigned int pos = 0;
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||
VasEBoot_minix_ino_t dirino;
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||
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||
while (1)
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||
{
|
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name = next;
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/* Skip the first slash. */
|
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while (*name == '/')
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name++;
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if (!*name)
|
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return VasEBoot_ERR_NONE;
|
||
|
||
if ((VasEBoot_MINIX_INODE_MODE (data)
|
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& VasEBoot_MINIX_IFDIR) != VasEBoot_MINIX_IFDIR)
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return VasEBoot_error (VasEBoot_ERR_BAD_FILE_TYPE, N_("not a directory"));
|
||
|
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/* Extract the actual part from the pathname. */
|
||
for (next = name; *next && *next != '/'; next++);
|
||
|
||
for (pos = 0; ; )
|
||
{
|
||
VasEBoot_minix_ino_t ino;
|
||
char filename[MAX_MINIX_FILENAME_SIZE + 1];
|
||
|
||
if (pos >= VasEBoot_MINIX_INODE_SIZE (data))
|
||
{
|
||
VasEBoot_error (VasEBoot_ERR_FILE_NOT_FOUND, N_("file `%s' not found"), path);
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
if (VasEBoot_minix_read_file (data, 0, 0, pos, sizeof (ino),
|
||
(char *) &ino) < 0)
|
||
return VasEBoot_errno;
|
||
if (VasEBoot_minix_read_file (data, 0, 0, pos + sizeof (ino),
|
||
data->filename_size, (char *) filename)< 0)
|
||
return VasEBoot_errno;
|
||
|
||
pos += sizeof (ino) + data->filename_size;
|
||
|
||
filename[data->filename_size] = '\0';
|
||
|
||
/* Check if the current direntry matches the current part of the
|
||
pathname. */
|
||
if (VasEBoot_strncmp (name, filename, next - name) == 0
|
||
&& filename[next - name] == '\0')
|
||
{
|
||
dirino = data->ino;
|
||
VasEBoot_minix_read_inode (data, VasEBoot_minix_to_cpu_ino (ino));
|
||
|
||
/* Follow the symlink. */
|
||
if ((VasEBoot_MINIX_INODE_MODE (data)
|
||
& VasEBoot_MINIX_IFLNK) == VasEBoot_MINIX_IFLNK)
|
||
{
|
||
VasEBoot_minix_lookup_symlink (data, dirino);
|
||
if (VasEBoot_errno)
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/* Mount the filesystem on the disk DISK. */
|
||
static struct VasEBoot_minix_data *
|
||
VasEBoot_minix_mount (VasEBoot_disk_t disk)
|
||
{
|
||
struct VasEBoot_minix_data *data;
|
||
|
||
data = VasEBoot_malloc (sizeof (struct VasEBoot_minix_data));
|
||
if (!data)
|
||
return 0;
|
||
|
||
/* Read the superblock. */
|
||
VasEBoot_disk_read (disk, VasEBoot_MINIX_SBLOCK, 0,
|
||
sizeof (struct VasEBoot_minix_sblock),&data->sblock);
|
||
if (VasEBoot_errno)
|
||
goto fail;
|
||
|
||
if (data->sblock.magic == VasEBoot_cpu_to_minix16_compile_time (VasEBoot_MINIX_MAGIC))
|
||
{
|
||
#if !defined(MODE_MINIX3)
|
||
data->filename_size = 14;
|
||
#else
|
||
data->filename_size = 60;
|
||
#endif
|
||
}
|
||
#if !defined(MODE_MINIX3)
|
||
else if (data->sblock.magic
|
||
== VasEBoot_cpu_to_minix16_compile_time (VasEBoot_MINIX_MAGIC_30))
|
||
data->filename_size = 30;
|
||
#endif
|
||
else
|
||
goto fail;
|
||
|
||
/* 20 means 1G zones. We could support up to 31 but already 1G isn't
|
||
supported by anything else. */
|
||
if (VasEBoot_minix_to_cpu16 (data->sblock.log2_zone_size) >= 20)
|
||
goto fail;
|
||
|
||
data->disk = disk;
|
||
data->linknest = 0;
|
||
#ifdef MODE_MINIX3
|
||
/* These tests are endian-independent. No need to byteswap. */
|
||
if (data->sblock.block_size == 0xffff)
|
||
data->block_size = 2;
|
||
else
|
||
{
|
||
if ((data->sblock.block_size == VasEBoot_cpu_to_minix16_compile_time (0x200))
|
||
|| (data->sblock.block_size == 0)
|
||
|| (data->sblock.block_size & VasEBoot_cpu_to_minix16_compile_time (0x1ff)))
|
||
goto fail;
|
||
data->block_size = VasEBoot_minix_to_cpu16 (data->sblock.block_size)
|
||
>> VasEBoot_DISK_SECTOR_BITS;
|
||
}
|
||
#else
|
||
data->block_size = 2;
|
||
#endif
|
||
|
||
data->block_per_zone = (((VasEBoot_uint64_t) data->block_size << \
|
||
(VasEBoot_DISK_SECTOR_BITS + VasEBoot_minix_to_cpu16 (data->sblock.log2_zone_size)))
|
||
/ sizeof (VasEBoot_minix_uintn_t));
|
||
if (!data->block_per_zone)
|
||
goto fail;
|
||
|
||
return data;
|
||
|
||
fail:
|
||
VasEBoot_free (data);
|
||
#if defined(MODE_MINIX3)
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FS, "not a minix3 filesystem");
|
||
#elif defined(MODE_MINIX2)
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FS, "not a minix2 filesystem");
|
||
#else
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FS, "not a minix filesystem");
|
||
#endif
|
||
return 0;
|
||
}
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_minix_dir (VasEBoot_device_t device, const char *path,
|
||
VasEBoot_fs_dir_hook_t hook, void *hook_data)
|
||
{
|
||
struct VasEBoot_minix_data *data = 0;
|
||
unsigned int pos = 0;
|
||
|
||
data = VasEBoot_minix_mount (device->disk);
|
||
if (!data)
|
||
return VasEBoot_errno;
|
||
|
||
VasEBoot_minix_read_inode (data, VasEBoot_MINIX_ROOT_INODE);
|
||
if (VasEBoot_errno)
|
||
goto fail;
|
||
|
||
VasEBoot_minix_find_file (data, path);
|
||
if (VasEBoot_errno)
|
||
goto fail;
|
||
|
||
if ((VasEBoot_MINIX_INODE_MODE (data) & VasEBoot_MINIX_IFDIR) != VasEBoot_MINIX_IFDIR)
|
||
{
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FILE_TYPE, N_("not a directory"));
|
||
goto fail;
|
||
}
|
||
|
||
while (pos < VasEBoot_MINIX_INODE_SIZE (data))
|
||
{
|
||
VasEBoot_minix_ino_t ino;
|
||
char filename[MAX_MINIX_FILENAME_SIZE + 1];
|
||
VasEBoot_minix_ino_t dirino = data->ino;
|
||
struct VasEBoot_dirhook_info info;
|
||
VasEBoot_memset (&info, 0, sizeof (info));
|
||
|
||
|
||
if (VasEBoot_minix_read_file (data, 0, 0, pos, sizeof (ino),
|
||
(char *) &ino) < 0)
|
||
return VasEBoot_errno;
|
||
|
||
if (VasEBoot_minix_read_file (data, 0, 0, pos + sizeof (ino),
|
||
data->filename_size,
|
||
(char *) filename) < 0)
|
||
return VasEBoot_errno;
|
||
filename[data->filename_size] = '\0';
|
||
if (!ino)
|
||
{
|
||
pos += sizeof (ino) + data->filename_size;
|
||
continue;
|
||
}
|
||
|
||
VasEBoot_minix_read_inode (data, VasEBoot_minix_to_cpu_ino (ino));
|
||
info.dir = ((VasEBoot_MINIX_INODE_MODE (data)
|
||
& VasEBoot_MINIX_IFDIR) == VasEBoot_MINIX_IFDIR);
|
||
info.mtimeset = 1;
|
||
info.mtime = VasEBoot_minix_to_cpu32 (data->inode.mtime);
|
||
|
||
if (hook (filename, &info, hook_data) ? 1 : 0)
|
||
break;
|
||
|
||
/* Load the old inode back in. */
|
||
VasEBoot_minix_read_inode (data, dirino);
|
||
|
||
pos += sizeof (ino) + data->filename_size;
|
||
}
|
||
|
||
fail:
|
||
VasEBoot_free (data);
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
|
||
/* Open a file named NAME and initialize FILE. */
|
||
static VasEBoot_err_t
|
||
VasEBoot_minix_open (struct VasEBoot_file *file, const char *name)
|
||
{
|
||
struct VasEBoot_minix_data *data;
|
||
data = VasEBoot_minix_mount (file->device->disk);
|
||
if (!data)
|
||
return VasEBoot_errno;
|
||
|
||
/* Open the inode op the root directory. */
|
||
VasEBoot_minix_read_inode (data, VasEBoot_MINIX_ROOT_INODE);
|
||
if (VasEBoot_errno)
|
||
{
|
||
VasEBoot_free (data);
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
if (!name || name[0] != '/')
|
||
{
|
||
VasEBoot_error (VasEBoot_ERR_BAD_FILENAME, N_("invalid file name `%s'"), name);
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
/* Traverse the directory tree to the node that should be
|
||
opened. */
|
||
VasEBoot_minix_find_file (data, name);
|
||
if (VasEBoot_errno)
|
||
{
|
||
VasEBoot_free (data);
|
||
return VasEBoot_errno;
|
||
}
|
||
|
||
file->data = data;
|
||
file->size = VasEBoot_MINIX_INODE_SIZE (data);
|
||
|
||
return VasEBoot_ERR_NONE;
|
||
}
|
||
|
||
|
||
static VasEBoot_ssize_t
|
||
VasEBoot_minix_read (VasEBoot_file_t file, char *buf, VasEBoot_size_t len)
|
||
{
|
||
struct VasEBoot_minix_data *data =
|
||
(struct VasEBoot_minix_data *) file->data;
|
||
|
||
return VasEBoot_minix_read_file (data, file->read_hook, file->read_hook_data,
|
||
file->offset, len, buf);
|
||
}
|
||
|
||
|
||
static VasEBoot_err_t
|
||
VasEBoot_minix_close (VasEBoot_file_t file)
|
||
{
|
||
VasEBoot_free (file->data);
|
||
|
||
return VasEBoot_ERR_NONE;
|
||
}
|
||
|
||
|
||
|
||
static struct VasEBoot_fs VasEBoot_minix_fs =
|
||
{
|
||
#ifdef MODE_BIGENDIAN
|
||
#if defined(MODE_MINIX3)
|
||
.name = "minix3_be",
|
||
#elif defined(MODE_MINIX2)
|
||
.name = "minix2_be",
|
||
#else
|
||
.name = "minix_be",
|
||
#endif
|
||
#else
|
||
#if defined(MODE_MINIX3)
|
||
.name = "minix3",
|
||
#elif defined(MODE_MINIX2)
|
||
.name = "minix2",
|
||
#else
|
||
.name = "minix",
|
||
#endif
|
||
#endif
|
||
.dir = VasEBoot_minix_dir,
|
||
.open = VasEBoot_minix_open,
|
||
.read = VasEBoot_minix_read,
|
||
.close = VasEBoot_minix_close,
|
||
#ifdef VasEBoot_UTIL
|
||
.reserved_first_sector = 1,
|
||
.blocklist_install = 1,
|
||
#endif
|
||
.next = 0
|
||
};
|
||
|
||
#ifdef MODE_BIGENDIAN
|
||
#if defined(MODE_MINIX3)
|
||
VasEBoot_MOD_INIT(minix3_be)
|
||
#elif defined(MODE_MINIX2)
|
||
VasEBoot_MOD_INIT(minix2_be)
|
||
#else
|
||
VasEBoot_MOD_INIT(minix_be)
|
||
#endif
|
||
#else
|
||
#if defined(MODE_MINIX3)
|
||
VasEBoot_MOD_INIT(minix3)
|
||
#elif defined(MODE_MINIX2)
|
||
VasEBoot_MOD_INIT(minix2)
|
||
#else
|
||
VasEBoot_MOD_INIT(minix)
|
||
#endif
|
||
#endif
|
||
{
|
||
VasEBoot_fs_register (&VasEBoot_minix_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
#ifdef MODE_BIGENDIAN
|
||
#if defined(MODE_MINIX3)
|
||
VasEBoot_MOD_FINI(minix3_be)
|
||
#elif defined(MODE_MINIX2)
|
||
VasEBoot_MOD_FINI(minix2_be)
|
||
#else
|
||
VasEBoot_MOD_FINI(minix_be)
|
||
#endif
|
||
#else
|
||
#if defined(MODE_MINIX3)
|
||
VasEBoot_MOD_FINI(minix3)
|
||
#elif defined(MODE_MINIX2)
|
||
VasEBoot_MOD_FINI(minix2)
|
||
#else
|
||
VasEBoot_MOD_FINI(minix)
|
||
#endif
|
||
#endif
|
||
{
|
||
VasEBoot_fs_unregister (&VasEBoot_minix_fs);
|
||
}
|