^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/sysv/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * minix/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * xenix/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 1992 Doug Evans
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * coh/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Copyright (C) 1993 Pascal Haible, Bruno Haible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * sysv/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Copyright (C) 1993 Paul B. Monday
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * sysv/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Copyright (C) 1993 Bruno Haible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * This file contains code for read/parsing the superblock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include "sysv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * The following functions try to recognize specific filesystems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * We recognize:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * - Xenix FS by its magic number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * - SystemV FS by its magic number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * - Coherent FS by its funny fname/fpack field.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * - SCO AFS by s_nfree == 0xffff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * - V7 FS has no distinguishing features.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * We discriminate among SystemV4 and SystemV2 FS by the assumption that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * the time stamp is not < 01-01-1980.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct buffer_head *bh1 = sbi->s_bh1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct buffer_head *bh2 = sbi->s_bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct xenix_super_block * sbd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct xenix_super_block * sbd2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (bh1 != bh2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* block size = 512, so bh1 != bh2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) sbd1 = (struct xenix_super_block *) bh1->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *max_links = XENIX_LINK_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sbi->s_fic_size = XENIX_NICINOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) sbi->s_flc_size = XENIX_NICFREE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) sbi->s_sbd1 = (char *)sbd1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) sbi->s_sbd2 = (char *)sbd2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) sbi->s_sb_fic_count = &sbd1->s_ninode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) sbi->s_bcache_count = &sbd1->s_nfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) sbi->s_bcache = &sbd1->s_free[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) sbi->s_free_blocks = &sbd2->s_tfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) sbi->s_sb_time = &sbd2->s_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct sysv4_super_block * sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct buffer_head *bh1 = sbi->s_bh1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct buffer_head *bh2 = sbi->s_bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (bh1 == bh2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) sbd = (struct sysv4_super_block *) bh2->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *max_links = SYSV_LINK_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) sbi->s_fic_size = SYSV_NICINOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) sbi->s_flc_size = SYSV_NICFREE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) sbi->s_sbd1 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) sbi->s_sbd2 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) sbi->s_sb_fic_count = &sbd->s_ninode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) sbi->s_sb_fic_inodes = &sbd->s_inode[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) sbi->s_sb_total_free_inodes = &sbd->s_tinode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) sbi->s_bcache_count = &sbd->s_nfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) sbi->s_bcache = &sbd->s_free[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) sbi->s_free_blocks = &sbd->s_tfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) sbi->s_sb_time = &sbd->s_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) sbi->s_sb_state = &sbd->s_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct sysv2_super_block *sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct buffer_head *bh1 = sbi->s_bh1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct buffer_head *bh2 = sbi->s_bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (bh1 == bh2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) sbd = (struct sysv2_super_block *) bh2->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) *max_links = SYSV_LINK_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) sbi->s_fic_size = SYSV_NICINOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) sbi->s_flc_size = SYSV_NICFREE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) sbi->s_sbd1 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) sbi->s_sbd2 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) sbi->s_sb_fic_count = &sbd->s_ninode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) sbi->s_sb_fic_inodes = &sbd->s_inode[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) sbi->s_sb_total_free_inodes = &sbd->s_tinode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) sbi->s_bcache_count = &sbd->s_nfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) sbi->s_bcache = &sbd->s_free[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) sbi->s_free_blocks = &sbd->s_tfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) sbi->s_sb_time = &sbd->s_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) sbi->s_sb_state = &sbd->s_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct coh_super_block * sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct buffer_head *bh1 = sbi->s_bh1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) sbd = (struct coh_super_block *) bh1->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) *max_links = COH_LINK_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) sbi->s_fic_size = COH_NICINOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) sbi->s_flc_size = COH_NICFREE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) sbi->s_sbd1 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) sbi->s_sbd2 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) sbi->s_sb_fic_count = &sbd->s_ninode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) sbi->s_sb_fic_inodes = &sbd->s_inode[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) sbi->s_sb_total_free_inodes = &sbd->s_tinode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) sbi->s_bcache_count = &sbd->s_nfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) sbi->s_bcache = &sbd->s_free[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) sbi->s_free_blocks = &sbd->s_tfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) sbi->s_sb_time = &sbd->s_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct buffer_head *bh2 = sbi->s_bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) *max_links = V7_LINK_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) sbi->s_fic_size = V7_NICINOD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) sbi->s_flc_size = V7_NICFREE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) sbi->s_sbd1 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) sbi->s_sbd2 = (char *)sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) sbi->s_sb_fic_count = &sbd->s_ninode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) sbi->s_sb_fic_inodes = &sbd->s_inode[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) sbi->s_sb_total_free_inodes = &sbd->s_tinode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) sbi->s_bcache_count = &sbd->s_nfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) sbi->s_bcache = &sbd->s_free[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) sbi->s_free_blocks = &sbd->s_tfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) sbi->s_sb_time = &sbd->s_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) sbi->s_bytesex = BYTESEX_LE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) sbi->s_bytesex = BYTESEX_BE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) switch (fs32_to_cpu(sbi, sbd->s_type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) sbi->s_type = FSTYPE_XENIX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) sbi->s_type = FSTYPE_XENIX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct super_block *sb = sbi->s_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /* All relevant fields are at the same offsets in R2 and R4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct sysv4_super_block * sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) u32 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) sbi->s_bytesex = BYTESEX_LE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) sbi->s_bytesex = BYTESEX_BE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) type = fs32_to_cpu(sbi, sbd->s_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) sbi->s_type = FSTYPE_AFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) sbi->s_forced_ro = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (!sb_rdonly(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) printk("SysV FS: SCO EAFS on %s detected, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) "forcing read-only mode.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /* this is likely to happen on SystemV2 FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (type > 3 || type < 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) sbi->s_type = FSTYPE_SYSV2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 0x20 or 0x30 indicates that symbolic links and the 14-character
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) filename limit is gone. Due to lack of information about this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) feature read-only mode seems to be a reasonable approach... -KGB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (type >= 0x10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) printk("SysV FS: can't handle long file names on %s, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) "forcing read-only mode.\n", sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) sbi->s_forced_ro = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) sbi->s_type = FSTYPE_SYSV4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return type >= 0x10 ? type >> 4 : type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct coh_super_block * sbd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) sbi->s_bytesex = BYTESEX_PDP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) sbi->s_type = FSTYPE_COH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int size = detect_sysv(sbi, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return size>2 ? 0 : size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) int (*test)(struct sysv_sb_info *, struct buffer_head *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) } flavours[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {1, detect_xenix},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {0, detect_sysv},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {0, detect_coherent},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {9, detect_sysv_odd},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {15,detect_sysv_odd},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {18,detect_sysv},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static char *flavour_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) [FSTYPE_XENIX] = "Xenix",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) [FSTYPE_SYSV4] = "SystemV",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) [FSTYPE_SYSV2] = "SystemV Release 2",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) [FSTYPE_COH] = "Coherent",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) [FSTYPE_V7] = "V7",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) [FSTYPE_AFS] = "AFS",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) [FSTYPE_XENIX] = detected_xenix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) [FSTYPE_SYSV4] = detected_sysv4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) [FSTYPE_SYSV2] = detected_sysv2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) [FSTYPE_COH] = detected_coherent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) [FSTYPE_V7] = detected_v7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) [FSTYPE_AFS] = detected_sysv4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static int complete_read_super(struct super_block *sb, int silent, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) struct sysv_sb_info *sbi = SYSV_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct inode *root_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) char *found = flavour_names[sbi->s_type];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) u_char n_bits = size+8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) int bsize = 1 << n_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) int bsize_4 = bsize >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) sbi->s_firstinodezone = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) sbi->s_inodes_per_block = bsize >> 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) sbi->s_inodes_per_block_bits = n_bits-6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) sbi->s_ind_per_block = bsize_4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) sbi->s_ind_per_block_2 = bsize_4*bsize_4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) sbi->s_ind_per_block_bits = n_bits-2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) << sbi->s_inodes_per_block_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) printk("VFS: Found a %s FS (block size = %ld) on device %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) found, sb->s_blocksize, sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /* set up enough so that it can read an inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) sb->s_op = &sysv_sops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (sbi->s_forced_ro)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) root_inode = sysv_iget(sb, SYSV_ROOT_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (IS_ERR(root_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) printk("SysV FS: get root inode failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) sb->s_root = d_make_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (!sb->s_root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) printk("SysV FS: get root dentry failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static int sysv_fill_super(struct super_block *sb, void *data, int silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct buffer_head *bh1, *bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct sysv_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) unsigned long blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) int size = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) BUILD_BUG_ON(1024 != sizeof (struct xenix_super_block));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) BUILD_BUG_ON(512 != sizeof (struct sysv4_super_block));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) BUILD_BUG_ON(512 != sizeof (struct sysv2_super_block));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) BUILD_BUG_ON(500 != sizeof (struct coh_super_block));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) BUILD_BUG_ON(64 != sizeof (struct sysv_inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (!sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) sbi->s_sb = sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) sbi->s_block_base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) mutex_init(&sbi->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) sb->s_fs_info = sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) sb->s_time_min = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) sb->s_time_max = U32_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) sb_set_blocksize(sb, BLOCK_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) bh = sb_bread(sb, flavours[i].block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) size = flavours[i].test(SYSV_SB(sb), bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) goto Eunknown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) switch (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) blocknr = bh->b_blocknr << 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) sb_set_blocksize(sb, 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) bh1 = sb_bread(sb, blocknr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) bh = sb_bread(sb, blocknr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) bh1 = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) blocknr = bh->b_blocknr >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) sb_set_blocksize(sb, 2048);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) bh1 = bh = sb_bread(sb, blocknr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) goto Ebadsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (bh && bh1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) sbi->s_bh1 = bh1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) sbi->s_bh2 = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (complete_read_super(sb, silent, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) brelse(bh1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) sb_set_blocksize(sb, BLOCK_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) printk("oldfs: cannot read superblock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) kfree(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) Eunknown:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) printk("VFS: unable to find oldfs superblock on device %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) Ebadsize:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) printk("VFS: oldfs: unsupported block size (%dKb)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 1<<(size-2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) struct v7_super_block *v7sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) struct sysv_inode *v7i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) struct buffer_head *bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) struct sysv_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) sbi = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) /* plausibility check on superblock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) v7sb = (struct v7_super_block *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) /* plausibility check on root inode: it is a directory,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) with a nonzero size that is a multiple of 16 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) bh2 = sb_bread(sb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (bh2 == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) v7i = (struct sysv_inode *)(bh2->b_data + 64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) (fs32_to_cpu(sbi, v7i->i_size) == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) (fs32_to_cpu(sbi, v7i->i_size) & 017) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) sizeof(struct sysv_dir_entry))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) brelse(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) brelse(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) static int v7_fill_super(struct super_block *sb, void *data, int silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) struct sysv_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (440 != sizeof (struct v7_super_block))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) panic("V7 FS: bad super-block size");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (64 != sizeof (struct sysv_inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) panic("sysv fs: bad i-node size");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (!sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) sbi->s_sb = sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sbi->s_block_base = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) sbi->s_type = FSTYPE_V7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) mutex_init(&sbi->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) sb->s_fs_info = sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) sb->s_time_min = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) sb->s_time_max = U32_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) sb_set_blocksize(sb, 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if ((bh = sb_bread(sb, 1)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) printk("VFS: unable to read V7 FS superblock on "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) "device %s.\n", sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) /* Try PDP-11 UNIX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) sbi->s_bytesex = BYTESEX_PDP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (v7_sanity_check(sb, bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) goto detected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) /* Try PC/IX, v7/x86 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) sbi->s_bytesex = BYTESEX_LE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (v7_sanity_check(sb, bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) goto detected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) detected:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) sbi->s_bh1 = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) sbi->s_bh2 = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (complete_read_super(sb, silent, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) kfree(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) /* Every kernel module contains stuff like this. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static struct dentry *sysv_mount(struct file_system_type *fs_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) int flags, const char *dev_name, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) return mount_bdev(fs_type, flags, dev_name, data, sysv_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) static struct dentry *v7_mount(struct file_system_type *fs_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) int flags, const char *dev_name, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) return mount_bdev(fs_type, flags, dev_name, data, v7_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) static struct file_system_type sysv_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) .name = "sysv",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) .mount = sysv_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) .kill_sb = kill_block_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) .fs_flags = FS_REQUIRES_DEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) MODULE_ALIAS_FS("sysv");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) static struct file_system_type v7_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) .name = "v7",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) .mount = v7_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) .kill_sb = kill_block_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) .fs_flags = FS_REQUIRES_DEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) MODULE_ALIAS_FS("v7");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) MODULE_ALIAS("v7");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) static int __init init_sysv_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) error = sysv_init_icache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) error = register_filesystem(&sysv_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) goto destroy_icache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) error = register_filesystem(&v7_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) goto unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) unregister_filesystem(&sysv_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) destroy_icache:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) sysv_destroy_icache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) static void __exit exit_sysv_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) unregister_filesystem(&sysv_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) unregister_filesystem(&v7_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) sysv_destroy_icache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) module_init(init_sysv_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) module_exit(exit_sysv_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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