1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
509 lines
12 KiB
C
509 lines
12 KiB
C
/*
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* linux/fs/adfs/super.c
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*
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* Copyright (C) 1997-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/adfs_fs.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <linux/parser.h>
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#include <linux/bitops.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <stdarg.h>
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#include "adfs.h"
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#include "dir_f.h"
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#include "dir_fplus.h"
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void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
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{
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char error_buf[128];
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va_list args;
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va_start(args, fmt);
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vsprintf(error_buf, fmt, args);
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va_end(args);
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printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
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sb->s_id, function ? ": " : "",
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function ? function : "", error_buf);
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}
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static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
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{
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int i;
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/* sector size must be 256, 512 or 1024 bytes */
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if (dr->log2secsize != 8 &&
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dr->log2secsize != 9 &&
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dr->log2secsize != 10)
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return 1;
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/* idlen must be at least log2secsize + 3 */
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if (dr->idlen < dr->log2secsize + 3)
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return 1;
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/* we cannot have such a large disc that we
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* are unable to represent sector offsets in
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* 32 bits. This works out at 2.0 TB.
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*/
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if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
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return 1;
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/* idlen must be no greater than 19 v2 [1.0] */
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if (dr->idlen > 19)
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return 1;
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/* reserved bytes should be zero */
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for (i = 0; i < sizeof(dr->unused52); i++)
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if (dr->unused52[i] != 0)
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return 1;
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return 0;
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}
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static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
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{
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unsigned int v0, v1, v2, v3;
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int i;
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v0 = v1 = v2 = v3 = 0;
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for (i = sb->s_blocksize - 4; i; i -= 4) {
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v0 += map[i] + (v3 >> 8);
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v3 &= 0xff;
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v1 += map[i + 1] + (v0 >> 8);
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v0 &= 0xff;
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v2 += map[i + 2] + (v1 >> 8);
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v1 &= 0xff;
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v3 += map[i + 3] + (v2 >> 8);
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v2 &= 0xff;
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}
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v0 += v3 >> 8;
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v1 += map[1] + (v0 >> 8);
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v2 += map[2] + (v1 >> 8);
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v3 += map[3] + (v2 >> 8);
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return v0 ^ v1 ^ v2 ^ v3;
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}
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static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
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{
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unsigned char crosscheck = 0, zonecheck = 1;
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int i;
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for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
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unsigned char *map;
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map = dm[i].dm_bh->b_data;
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if (adfs_calczonecheck(sb, map) != map[0]) {
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adfs_error(sb, "zone %d fails zonecheck", i);
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zonecheck = 0;
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}
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crosscheck ^= map[3];
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}
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if (crosscheck != 0xff)
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adfs_error(sb, "crosscheck != 0xff");
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return crosscheck == 0xff && zonecheck;
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}
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static void adfs_put_super(struct super_block *sb)
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{
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int i;
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struct adfs_sb_info *asb = ADFS_SB(sb);
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for (i = 0; i < asb->s_map_size; i++)
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brelse(asb->s_map[i].dm_bh);
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kfree(asb->s_map);
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kfree(asb);
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sb->s_fs_info = NULL;
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}
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enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
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static match_table_t tokens = {
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_ownmask, "ownmask=%o"},
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{Opt_othmask, "othmask=%o"},
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{Opt_err, NULL}
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};
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static int parse_options(struct super_block *sb, char *options)
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{
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char *p;
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struct adfs_sb_info *asb = ADFS_SB(sb);
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int option;
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if (!options)
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return 0;
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while ((p = strsep(&options, ",")) != NULL) {
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substring_t args[MAX_OPT_ARGS];
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_uid = option;
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break;
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case Opt_gid:
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if (match_int(args, &option))
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return -EINVAL;
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asb->s_gid = option;
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break;
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case Opt_ownmask:
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if (match_octal(args, &option))
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return -EINVAL;
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asb->s_owner_mask = option;
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break;
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case Opt_othmask:
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if (match_octal(args, &option))
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return -EINVAL;
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asb->s_other_mask = option;
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break;
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default:
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printk("ADFS-fs: unrecognised mount option \"%s\" "
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"or missing value\n", p);
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return -EINVAL;
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}
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}
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return 0;
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}
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static int adfs_remount(struct super_block *sb, int *flags, char *data)
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{
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*flags |= MS_NODIRATIME;
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return parse_options(sb, data);
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}
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static int adfs_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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struct adfs_sb_info *asb = ADFS_SB(sb);
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buf->f_type = ADFS_SUPER_MAGIC;
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buf->f_namelen = asb->s_namelen;
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buf->f_bsize = sb->s_blocksize;
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buf->f_blocks = asb->s_size;
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buf->f_files = asb->s_ids_per_zone * asb->s_map_size;
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buf->f_bavail =
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buf->f_bfree = adfs_map_free(sb);
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buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
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return 0;
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}
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static kmem_cache_t *adfs_inode_cachep;
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static struct inode *adfs_alloc_inode(struct super_block *sb)
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{
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struct adfs_inode_info *ei;
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ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, SLAB_KERNEL);
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if (!ei)
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return NULL;
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return &ei->vfs_inode;
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}
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static void adfs_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
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}
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static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
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{
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struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR)
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inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
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{
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adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
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sizeof(struct adfs_inode_info),
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0, SLAB_RECLAIM_ACCOUNT,
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init_once, NULL);
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if (adfs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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if (kmem_cache_destroy(adfs_inode_cachep))
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printk(KERN_INFO "adfs_inode_cache: not all structures were freed\n");
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}
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static struct super_operations adfs_sops = {
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.alloc_inode = adfs_alloc_inode,
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.destroy_inode = adfs_destroy_inode,
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.write_inode = adfs_write_inode,
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.put_super = adfs_put_super,
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.statfs = adfs_statfs,
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.remount_fs = adfs_remount,
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};
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static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
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{
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struct adfs_discmap *dm;
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unsigned int map_addr, zone_size, nzones;
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int i, zone;
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struct adfs_sb_info *asb = ADFS_SB(sb);
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nzones = asb->s_map_size;
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zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
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map_addr = (nzones >> 1) * zone_size -
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((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
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map_addr = signed_asl(map_addr, asb->s_map2blk);
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asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
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dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL);
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if (dm == NULL) {
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adfs_error(sb, "not enough memory");
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return NULL;
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}
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for (zone = 0; zone < nzones; zone++, map_addr++) {
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dm[zone].dm_startbit = 0;
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dm[zone].dm_endbit = zone_size;
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dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
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dm[zone].dm_bh = sb_bread(sb, map_addr);
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if (!dm[zone].dm_bh) {
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adfs_error(sb, "unable to read map");
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goto error_free;
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}
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}
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/* adjust the limits for the first and last map zones */
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i = zone - 1;
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dm[0].dm_startblk = 0;
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dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
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dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
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(le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
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(ADFS_DR_SIZE_BITS - i * zone_size);
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if (adfs_checkmap(sb, dm))
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return dm;
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adfs_error(sb, NULL, "map corrupted");
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error_free:
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while (--zone >= 0)
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brelse(dm[zone].dm_bh);
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kfree(dm);
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return NULL;
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}
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static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
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{
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unsigned long discsize;
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discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
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discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
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return discsize;
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}
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static int adfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct adfs_discrecord *dr;
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struct buffer_head *bh;
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struct object_info root_obj;
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unsigned char *b_data;
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struct adfs_sb_info *asb;
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struct inode *root;
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sb->s_flags |= MS_NODIRATIME;
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asb = kmalloc(sizeof(*asb), GFP_KERNEL);
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if (!asb)
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return -ENOMEM;
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sb->s_fs_info = asb;
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memset(asb, 0, sizeof(*asb));
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/* set default options */
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asb->s_uid = 0;
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asb->s_gid = 0;
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asb->s_owner_mask = S_IRWXU;
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asb->s_other_mask = S_IRWXG | S_IRWXO;
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if (parse_options(sb, data))
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goto error;
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sb_set_blocksize(sb, BLOCK_SIZE);
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if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
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adfs_error(sb, "unable to read superblock");
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goto error;
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}
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b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
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if (adfs_checkbblk(b_data)) {
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if (!silent)
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printk("VFS: Can't find an adfs filesystem on dev "
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"%s.\n", sb->s_id);
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goto error_free_bh;
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}
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dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
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/*
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* Do some sanity checks on the ADFS disc record
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*/
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if (adfs_checkdiscrecord(dr)) {
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if (!silent)
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printk("VPS: Can't find an adfs filesystem on dev "
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"%s.\n", sb->s_id);
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goto error_free_bh;
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}
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brelse(bh);
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if (sb_set_blocksize(sb, 1 << dr->log2secsize)) {
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bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
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if (!bh) {
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adfs_error(sb, "couldn't read superblock on "
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"2nd try.");
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goto error;
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}
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b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
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if (adfs_checkbblk(b_data)) {
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adfs_error(sb, "disc record mismatch, very weird!");
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goto error_free_bh;
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}
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dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
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} else {
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if (!silent)
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printk(KERN_ERR "VFS: Unsupported blocksize on dev "
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"%s.\n", sb->s_id);
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goto error;
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}
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/*
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* blocksize on this device should now be set to the ADFS log2secsize
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*/
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sb->s_magic = ADFS_SUPER_MAGIC;
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asb->s_idlen = dr->idlen;
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asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
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asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
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asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
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asb->s_version = dr->format_version;
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asb->s_log2sharesize = dr->log2sharesize;
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asb->s_map = adfs_read_map(sb, dr);
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if (!asb->s_map)
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goto error_free_bh;
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brelse(bh);
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/*
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* set up enough so that we can read an inode
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*/
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sb->s_op = &adfs_sops;
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dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
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root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
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root_obj.name_len = 0;
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root_obj.loadaddr = 0;
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root_obj.execaddr = 0;
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root_obj.size = ADFS_NEWDIR_SIZE;
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root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
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ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
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/*
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* If this is a F+ disk with variable length directories,
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* get the root_size from the disc record.
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*/
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if (asb->s_version) {
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root_obj.size = le32_to_cpu(dr->root_size);
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asb->s_dir = &adfs_fplus_dir_ops;
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asb->s_namelen = ADFS_FPLUS_NAME_LEN;
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} else {
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asb->s_dir = &adfs_f_dir_ops;
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asb->s_namelen = ADFS_F_NAME_LEN;
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}
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root = adfs_iget(sb, &root_obj);
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sb->s_root = d_alloc_root(root);
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if (!sb->s_root) {
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int i;
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iput(root);
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for (i = 0; i < asb->s_map_size; i++)
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brelse(asb->s_map[i].dm_bh);
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kfree(asb->s_map);
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adfs_error(sb, "get root inode failed\n");
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goto error;
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} else
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sb->s_root->d_op = &adfs_dentry_operations;
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return 0;
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error_free_bh:
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brelse(bh);
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error:
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sb->s_fs_info = NULL;
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kfree(asb);
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return -EINVAL;
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}
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static struct super_block *adfs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
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}
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static struct file_system_type adfs_fs_type = {
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.owner = THIS_MODULE,
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.name = "adfs",
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.get_sb = adfs_get_sb,
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.kill_sb = kill_block_super,
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.fs_flags = FS_REQUIRES_DEV,
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};
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static int __init init_adfs_fs(void)
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{
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int err = init_inodecache();
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if (err)
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goto out1;
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err = register_filesystem(&adfs_fs_type);
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if (err)
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goto out;
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return 0;
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out:
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destroy_inodecache();
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out1:
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return err;
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}
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static void __exit exit_adfs_fs(void)
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{
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unregister_filesystem(&adfs_fs_type);
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destroy_inodecache();
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}
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module_init(init_adfs_fs)
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module_exit(exit_adfs_fs)
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