595 lines
15 KiB
C
595 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/sysv/inode.c
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*
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* minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* xenix/inode.c
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* Copyright (C) 1992 Doug Evans
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*
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* coh/inode.c
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* Copyright (C) 1993 Pascal Haible, Bruno Haible
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*
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* sysv/inode.c
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* Copyright (C) 1993 Paul B. Monday
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*
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* sysv/inode.c
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* Copyright (C) 1993 Bruno Haible
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* Copyright (C) 1997, 1998 Krzysztof G. Baranowski
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*
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* This file contains code for read/parsing the superblock.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include "sysv.h"
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/*
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* The following functions try to recognize specific filesystems.
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*
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* We recognize:
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* - Xenix FS by its magic number.
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* - SystemV FS by its magic number.
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* - Coherent FS by its funny fname/fpack field.
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* - SCO AFS by s_nfree == 0xffff
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* - V7 FS has no distinguishing features.
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*
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* We discriminate among SystemV4 and SystemV2 FS by the assumption that
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* the time stamp is not < 01-01-1980.
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*/
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enum {
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JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
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};
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static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links)
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{
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struct buffer_head *bh1 = sbi->s_bh1;
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struct buffer_head *bh2 = sbi->s_bh2;
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struct xenix_super_block * sbd1;
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struct xenix_super_block * sbd2;
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if (bh1 != bh2)
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sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
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else {
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/* block size = 512, so bh1 != bh2 */
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sbd1 = (struct xenix_super_block *) bh1->b_data;
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sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
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}
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*max_links = XENIX_LINK_MAX;
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sbi->s_fic_size = XENIX_NICINOD;
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sbi->s_flc_size = XENIX_NICFREE;
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sbi->s_sbd1 = (char *)sbd1;
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sbi->s_sbd2 = (char *)sbd2;
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sbi->s_sb_fic_count = &sbd1->s_ninode;
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sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
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sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
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sbi->s_bcache_count = &sbd1->s_nfree;
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sbi->s_bcache = &sbd1->s_free[0];
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sbi->s_free_blocks = &sbd2->s_tfree;
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sbi->s_sb_time = &sbd2->s_time;
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sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
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sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
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}
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static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links)
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{
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struct sysv4_super_block * sbd;
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struct buffer_head *bh1 = sbi->s_bh1;
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struct buffer_head *bh2 = sbi->s_bh2;
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if (bh1 == bh2)
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sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
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else
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sbd = (struct sysv4_super_block *) bh2->b_data;
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*max_links = SYSV_LINK_MAX;
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sbi->s_fic_size = SYSV_NICINOD;
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sbi->s_flc_size = SYSV_NICFREE;
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sbi->s_sbd1 = (char *)sbd;
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sbi->s_sbd2 = (char *)sbd;
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sbi->s_sb_fic_count = &sbd->s_ninode;
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sbi->s_sb_fic_inodes = &sbd->s_inode[0];
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sbi->s_sb_total_free_inodes = &sbd->s_tinode;
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sbi->s_bcache_count = &sbd->s_nfree;
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sbi->s_bcache = &sbd->s_free[0];
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sbi->s_free_blocks = &sbd->s_tfree;
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sbi->s_sb_time = &sbd->s_time;
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sbi->s_sb_state = &sbd->s_state;
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sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
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sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
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}
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static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links)
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{
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struct sysv2_super_block *sbd;
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struct buffer_head *bh1 = sbi->s_bh1;
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struct buffer_head *bh2 = sbi->s_bh2;
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if (bh1 == bh2)
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sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
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else
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sbd = (struct sysv2_super_block *) bh2->b_data;
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*max_links = SYSV_LINK_MAX;
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sbi->s_fic_size = SYSV_NICINOD;
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sbi->s_flc_size = SYSV_NICFREE;
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sbi->s_sbd1 = (char *)sbd;
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sbi->s_sbd2 = (char *)sbd;
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sbi->s_sb_fic_count = &sbd->s_ninode;
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sbi->s_sb_fic_inodes = &sbd->s_inode[0];
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sbi->s_sb_total_free_inodes = &sbd->s_tinode;
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sbi->s_bcache_count = &sbd->s_nfree;
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sbi->s_bcache = &sbd->s_free[0];
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sbi->s_free_blocks = &sbd->s_tfree;
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sbi->s_sb_time = &sbd->s_time;
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sbi->s_sb_state = &sbd->s_state;
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sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
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sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
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}
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static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links)
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{
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struct coh_super_block * sbd;
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struct buffer_head *bh1 = sbi->s_bh1;
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sbd = (struct coh_super_block *) bh1->b_data;
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*max_links = COH_LINK_MAX;
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sbi->s_fic_size = COH_NICINOD;
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sbi->s_flc_size = COH_NICFREE;
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sbi->s_sbd1 = (char *)sbd;
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sbi->s_sbd2 = (char *)sbd;
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sbi->s_sb_fic_count = &sbd->s_ninode;
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sbi->s_sb_fic_inodes = &sbd->s_inode[0];
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sbi->s_sb_total_free_inodes = &sbd->s_tinode;
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sbi->s_bcache_count = &sbd->s_nfree;
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sbi->s_bcache = &sbd->s_free[0];
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sbi->s_free_blocks = &sbd->s_tfree;
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sbi->s_sb_time = &sbd->s_time;
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sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
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sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
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}
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static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links)
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{
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struct buffer_head *bh2 = sbi->s_bh2;
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struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
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*max_links = V7_LINK_MAX;
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sbi->s_fic_size = V7_NICINOD;
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sbi->s_flc_size = V7_NICFREE;
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sbi->s_sbd1 = (char *)sbd;
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sbi->s_sbd2 = (char *)sbd;
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sbi->s_sb_fic_count = &sbd->s_ninode;
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sbi->s_sb_fic_inodes = &sbd->s_inode[0];
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sbi->s_sb_total_free_inodes = &sbd->s_tinode;
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sbi->s_bcache_count = &sbd->s_nfree;
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sbi->s_bcache = &sbd->s_free[0];
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sbi->s_free_blocks = &sbd->s_tfree;
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sbi->s_sb_time = &sbd->s_time;
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sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
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sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
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}
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static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh)
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{
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struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data;
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if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544))
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sbi->s_bytesex = BYTESEX_LE;
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else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544))
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sbi->s_bytesex = BYTESEX_BE;
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else
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return 0;
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switch (fs32_to_cpu(sbi, sbd->s_type)) {
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case 1:
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sbi->s_type = FSTYPE_XENIX;
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return 1;
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case 2:
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sbi->s_type = FSTYPE_XENIX;
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return 2;
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default:
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return 0;
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}
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}
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static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh)
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{
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struct super_block *sb = sbi->s_sb;
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/* All relevant fields are at the same offsets in R2 and R4 */
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struct sysv4_super_block * sbd;
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u32 type;
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sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
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if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20))
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sbi->s_bytesex = BYTESEX_LE;
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else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20))
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sbi->s_bytesex = BYTESEX_BE;
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else
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return 0;
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type = fs32_to_cpu(sbi, sbd->s_type);
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if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) {
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sbi->s_type = FSTYPE_AFS;
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sbi->s_forced_ro = 1;
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if (!sb_rdonly(sb)) {
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printk("SysV FS: SCO EAFS on %s detected, "
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"forcing read-only mode.\n",
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sb->s_id);
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}
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return type;
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}
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if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) {
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/* this is likely to happen on SystemV2 FS */
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if (type > 3 || type < 1)
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return 0;
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sbi->s_type = FSTYPE_SYSV2;
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return type;
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}
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if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10))
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return 0;
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/* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10,
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0x20 or 0x30 indicates that symbolic links and the 14-character
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filename limit is gone. Due to lack of information about this
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feature read-only mode seems to be a reasonable approach... -KGB */
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if (type >= 0x10) {
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printk("SysV FS: can't handle long file names on %s, "
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"forcing read-only mode.\n", sb->s_id);
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sbi->s_forced_ro = 1;
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}
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sbi->s_type = FSTYPE_SYSV4;
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return type >= 0x10 ? type >> 4 : type;
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}
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static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh)
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{
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struct coh_super_block * sbd;
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sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
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if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
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|| (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
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return 0;
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sbi->s_bytesex = BYTESEX_PDP;
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sbi->s_type = FSTYPE_COH;
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return 1;
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}
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static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh)
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{
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int size = detect_sysv(sbi, bh);
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return size>2 ? 0 : size;
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}
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static struct {
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int block;
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int (*test)(struct sysv_sb_info *, struct buffer_head *);
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} flavours[] = {
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{1, detect_xenix},
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{0, detect_sysv},
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{0, detect_coherent},
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{9, detect_sysv_odd},
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{15,detect_sysv_odd},
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{18,detect_sysv},
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};
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static char *flavour_names[] = {
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[FSTYPE_XENIX] = "Xenix",
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[FSTYPE_SYSV4] = "SystemV",
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[FSTYPE_SYSV2] = "SystemV Release 2",
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[FSTYPE_COH] = "Coherent",
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[FSTYPE_V7] = "V7",
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[FSTYPE_AFS] = "AFS",
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};
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static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = {
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[FSTYPE_XENIX] = detected_xenix,
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[FSTYPE_SYSV4] = detected_sysv4,
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[FSTYPE_SYSV2] = detected_sysv2,
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[FSTYPE_COH] = detected_coherent,
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[FSTYPE_V7] = detected_v7,
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[FSTYPE_AFS] = detected_sysv4,
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};
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static int complete_read_super(struct super_block *sb, int silent, int size)
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{
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struct sysv_sb_info *sbi = SYSV_SB(sb);
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struct inode *root_inode;
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char *found = flavour_names[sbi->s_type];
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u_char n_bits = size+8;
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int bsize = 1 << n_bits;
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int bsize_4 = bsize >> 2;
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sbi->s_firstinodezone = 2;
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flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
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sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
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sbi->s_inodes_per_block = bsize >> 6;
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sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
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sbi->s_inodes_per_block_bits = n_bits-6;
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sbi->s_ind_per_block = bsize_4;
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sbi->s_ind_per_block_2 = bsize_4*bsize_4;
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sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4));
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sbi->s_ind_per_block_bits = n_bits-2;
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sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone)
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<< sbi->s_inodes_per_block_bits;
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if (!silent)
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printk("VFS: Found a %s FS (block size = %ld) on device %s\n",
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found, sb->s_blocksize, sb->s_id);
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sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type;
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/* set up enough so that it can read an inode */
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sb->s_op = &sysv_sops;
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if (sbi->s_forced_ro)
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sb->s_flags |= SB_RDONLY;
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root_inode = sysv_iget(sb, SYSV_ROOT_INO);
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if (IS_ERR(root_inode)) {
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printk("SysV FS: get root inode failed\n");
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return 0;
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}
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sb->s_root = d_make_root(root_inode);
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if (!sb->s_root) {
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printk("SysV FS: get root dentry failed\n");
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return 0;
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}
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return 1;
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}
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static int sysv_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct buffer_head *bh1, *bh = NULL;
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struct sysv_sb_info *sbi;
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unsigned long blocknr;
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int size = 0, i;
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BUILD_BUG_ON(1024 != sizeof (struct xenix_super_block));
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BUILD_BUG_ON(512 != sizeof (struct sysv4_super_block));
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BUILD_BUG_ON(512 != sizeof (struct sysv2_super_block));
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BUILD_BUG_ON(500 != sizeof (struct coh_super_block));
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BUILD_BUG_ON(64 != sizeof (struct sysv_inode));
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sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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sbi->s_sb = sb;
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sbi->s_block_base = 0;
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mutex_init(&sbi->s_lock);
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sb->s_fs_info = sbi;
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sb->s_time_min = 0;
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sb->s_time_max = U32_MAX;
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sb_set_blocksize(sb, BLOCK_SIZE);
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for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) {
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brelse(bh);
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bh = sb_bread(sb, flavours[i].block);
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if (!bh)
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continue;
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size = flavours[i].test(SYSV_SB(sb), bh);
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}
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if (!size)
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goto Eunknown;
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switch (size) {
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case 1:
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blocknr = bh->b_blocknr << 1;
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brelse(bh);
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sb_set_blocksize(sb, 512);
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bh1 = sb_bread(sb, blocknr);
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bh = sb_bread(sb, blocknr + 1);
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break;
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case 2:
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bh1 = bh;
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break;
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case 3:
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blocknr = bh->b_blocknr >> 1;
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brelse(bh);
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sb_set_blocksize(sb, 2048);
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bh1 = bh = sb_bread(sb, blocknr);
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break;
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default:
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goto Ebadsize;
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}
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if (bh && bh1) {
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sbi->s_bh1 = bh1;
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sbi->s_bh2 = bh;
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if (complete_read_super(sb, silent, size))
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return 0;
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}
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brelse(bh1);
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brelse(bh);
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sb_set_blocksize(sb, BLOCK_SIZE);
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printk("oldfs: cannot read superblock\n");
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failed:
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kfree(sbi);
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return -EINVAL;
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Eunknown:
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brelse(bh);
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if (!silent)
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printk("VFS: unable to find oldfs superblock on device %s\n",
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sb->s_id);
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goto failed;
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Ebadsize:
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brelse(bh);
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if (!silent)
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printk("VFS: oldfs: unsupported block size (%dKb)\n",
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1<<(size-2));
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goto failed;
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}
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|
|
static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh)
|
|
{
|
|
struct v7_super_block *v7sb;
|
|
struct sysv_inode *v7i;
|
|
struct buffer_head *bh2;
|
|
struct sysv_sb_info *sbi;
|
|
|
|
sbi = sb->s_fs_info;
|
|
|
|
/* plausibility check on superblock */
|
|
v7sb = (struct v7_super_block *) bh->b_data;
|
|
if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
|
|
fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
|
|
fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
|
|
return 0;
|
|
|
|
/* plausibility check on root inode: it is a directory,
|
|
with a nonzero size that is a multiple of 16 */
|
|
bh2 = sb_bread(sb, 2);
|
|
if (bh2 == NULL)
|
|
return 0;
|
|
|
|
v7i = (struct sysv_inode *)(bh2->b_data + 64);
|
|
if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
|
|
(fs32_to_cpu(sbi, v7i->i_size) == 0) ||
|
|
(fs32_to_cpu(sbi, v7i->i_size) & 017) ||
|
|
(fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
|
|
sizeof(struct sysv_dir_entry))) {
|
|
brelse(bh2);
|
|
return 0;
|
|
}
|
|
|
|
brelse(bh2);
|
|
return 1;
|
|
}
|
|
|
|
static int v7_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct sysv_sb_info *sbi;
|
|
struct buffer_head *bh;
|
|
|
|
if (440 != sizeof (struct v7_super_block))
|
|
panic("V7 FS: bad super-block size");
|
|
if (64 != sizeof (struct sysv_inode))
|
|
panic("sysv fs: bad i-node size");
|
|
|
|
sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
sbi->s_sb = sb;
|
|
sbi->s_block_base = 0;
|
|
sbi->s_type = FSTYPE_V7;
|
|
mutex_init(&sbi->s_lock);
|
|
sb->s_fs_info = sbi;
|
|
sb->s_time_min = 0;
|
|
sb->s_time_max = U32_MAX;
|
|
|
|
sb_set_blocksize(sb, 512);
|
|
|
|
if ((bh = sb_bread(sb, 1)) == NULL) {
|
|
if (!silent)
|
|
printk("VFS: unable to read V7 FS superblock on "
|
|
"device %s.\n", sb->s_id);
|
|
goto failed;
|
|
}
|
|
|
|
/* Try PDP-11 UNIX */
|
|
sbi->s_bytesex = BYTESEX_PDP;
|
|
if (v7_sanity_check(sb, bh))
|
|
goto detected;
|
|
|
|
/* Try PC/IX, v7/x86 */
|
|
sbi->s_bytesex = BYTESEX_LE;
|
|
if (v7_sanity_check(sb, bh))
|
|
goto detected;
|
|
|
|
goto failed;
|
|
|
|
detected:
|
|
sbi->s_bh1 = bh;
|
|
sbi->s_bh2 = bh;
|
|
if (complete_read_super(sb, silent, 1))
|
|
return 0;
|
|
|
|
failed:
|
|
printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n",
|
|
sb->s_id);
|
|
brelse(bh);
|
|
kfree(sbi);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Every kernel module contains stuff like this. */
|
|
|
|
static struct dentry *sysv_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, sysv_fill_super);
|
|
}
|
|
|
|
static struct dentry *v7_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, v7_fill_super);
|
|
}
|
|
|
|
static struct file_system_type sysv_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "sysv",
|
|
.mount = sysv_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("sysv");
|
|
|
|
static struct file_system_type v7_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "v7",
|
|
.mount = v7_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("v7");
|
|
MODULE_ALIAS("v7");
|
|
|
|
static int __init init_sysv_fs(void)
|
|
{
|
|
int error;
|
|
|
|
error = sysv_init_icache();
|
|
if (error)
|
|
goto out;
|
|
error = register_filesystem(&sysv_fs_type);
|
|
if (error)
|
|
goto destroy_icache;
|
|
error = register_filesystem(&v7_fs_type);
|
|
if (error)
|
|
goto unregister;
|
|
return 0;
|
|
|
|
unregister:
|
|
unregister_filesystem(&sysv_fs_type);
|
|
destroy_icache:
|
|
sysv_destroy_icache();
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static void __exit exit_sysv_fs(void)
|
|
{
|
|
unregister_filesystem(&sysv_fs_type);
|
|
unregister_filesystem(&v7_fs_type);
|
|
sysv_destroy_icache();
|
|
}
|
|
|
|
module_init(init_sysv_fs)
|
|
module_exit(exit_sysv_fs)
|
|
MODULE_LICENSE("GPL");
|