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-rw-r--r--fs/adfs/super.c566
1 files changed, 566 insertions, 0 deletions
diff --git a/fs/adfs/super.c b/fs/adfs/super.c
new file mode 100644
index 000000000..4dc15b263
--- /dev/null
+++ b/fs/adfs/super.c
@@ -0,0 +1,566 @@
+/*
+ * linux/fs/adfs/super.c
+ *
+ * Copyright (C) 1997-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/buffer_head.h>
+#include <linux/parser.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/statfs.h>
+#include <linux/user_namespace.h>
+#include "adfs.h"
+#include "dir_f.h"
+#include "dir_fplus.h"
+
+#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
+#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
+
+void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
+{
+ char error_buf[128];
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(error_buf, sizeof(error_buf), fmt, args);
+ va_end(args);
+
+ printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
+ sb->s_id, function ? ": " : "",
+ function ? function : "", error_buf);
+}
+
+static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
+{
+ int i;
+
+ /* sector size must be 256, 512 or 1024 bytes */
+ if (dr->log2secsize != 8 &&
+ dr->log2secsize != 9 &&
+ dr->log2secsize != 10)
+ return 1;
+
+ /* idlen must be at least log2secsize + 3 */
+ if (dr->idlen < dr->log2secsize + 3)
+ return 1;
+
+ /* we cannot have such a large disc that we
+ * are unable to represent sector offsets in
+ * 32 bits. This works out at 2.0 TB.
+ */
+ if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
+ return 1;
+
+ /* idlen must be no greater than 19 v2 [1.0] */
+ if (dr->idlen > 19)
+ return 1;
+
+ /* reserved bytes should be zero */
+ for (i = 0; i < sizeof(dr->unused52); i++)
+ if (dr->unused52[i] != 0)
+ return 1;
+
+ return 0;
+}
+
+static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
+{
+ unsigned int v0, v1, v2, v3;
+ int i;
+
+ v0 = v1 = v2 = v3 = 0;
+ for (i = sb->s_blocksize - 4; i; i -= 4) {
+ v0 += map[i] + (v3 >> 8);
+ v3 &= 0xff;
+ v1 += map[i + 1] + (v0 >> 8);
+ v0 &= 0xff;
+ v2 += map[i + 2] + (v1 >> 8);
+ v1 &= 0xff;
+ v3 += map[i + 3] + (v2 >> 8);
+ v2 &= 0xff;
+ }
+ v0 += v3 >> 8;
+ v1 += map[1] + (v0 >> 8);
+ v2 += map[2] + (v1 >> 8);
+ v3 += map[3] + (v2 >> 8);
+
+ return v0 ^ v1 ^ v2 ^ v3;
+}
+
+static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
+{
+ unsigned char crosscheck = 0, zonecheck = 1;
+ int i;
+
+ for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
+ unsigned char *map;
+
+ map = dm[i].dm_bh->b_data;
+
+ if (adfs_calczonecheck(sb, map) != map[0]) {
+ adfs_error(sb, "zone %d fails zonecheck", i);
+ zonecheck = 0;
+ }
+ crosscheck ^= map[3];
+ }
+ if (crosscheck != 0xff)
+ adfs_error(sb, "crosscheck != 0xff");
+ return crosscheck == 0xff && zonecheck;
+}
+
+static void adfs_put_super(struct super_block *sb)
+{
+ int i;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ for (i = 0; i < asb->s_map_size; i++)
+ brelse(asb->s_map[i].dm_bh);
+ kfree(asb->s_map);
+ kfree_rcu(asb, rcu);
+}
+
+static int adfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
+
+ if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
+ seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
+ if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
+ seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
+ if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
+ seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
+ if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
+ seq_printf(seq, ",othmask=%o", asb->s_other_mask);
+ if (asb->s_ftsuffix != 0)
+ seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
+
+ return 0;
+}
+
+enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
+
+static const match_table_t tokens = {
+ {Opt_uid, "uid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_ownmask, "ownmask=%o"},
+ {Opt_othmask, "othmask=%o"},
+ {Opt_ftsuffix, "ftsuffix=%u"},
+ {Opt_err, NULL}
+};
+
+static int parse_options(struct super_block *sb, char *options)
+{
+ char *p;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+ int option;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_uid:
+ if (match_int(args, &option))
+ return -EINVAL;
+ asb->s_uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(asb->s_uid))
+ return -EINVAL;
+ break;
+ case Opt_gid:
+ if (match_int(args, &option))
+ return -EINVAL;
+ asb->s_gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(asb->s_gid))
+ return -EINVAL;
+ break;
+ case Opt_ownmask:
+ if (match_octal(args, &option))
+ return -EINVAL;
+ asb->s_owner_mask = option;
+ break;
+ case Opt_othmask:
+ if (match_octal(args, &option))
+ return -EINVAL;
+ asb->s_other_mask = option;
+ break;
+ case Opt_ftsuffix:
+ if (match_int(args, &option))
+ return -EINVAL;
+ asb->s_ftsuffix = option;
+ break;
+ default:
+ printk("ADFS-fs: unrecognised mount option \"%s\" "
+ "or missing value\n", p);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int adfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ sync_filesystem(sb);
+ *flags |= SB_NODIRATIME;
+ return parse_options(sb, data);
+}
+
+static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct adfs_sb_info *sbi = ADFS_SB(sb);
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+ buf->f_type = ADFS_SUPER_MAGIC;
+ buf->f_namelen = sbi->s_namelen;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = sbi->s_size;
+ buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
+ buf->f_bavail =
+ buf->f_bfree = adfs_map_free(sb);
+ buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
+
+ return 0;
+}
+
+static struct kmem_cache *adfs_inode_cachep;
+
+static struct inode *adfs_alloc_inode(struct super_block *sb)
+{
+ struct adfs_inode_info *ei;
+ ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void adfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
+}
+
+static void adfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, adfs_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+ adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
+ sizeof(struct adfs_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ init_once);
+ if (adfs_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(adfs_inode_cachep);
+}
+
+static const struct super_operations adfs_sops = {
+ .alloc_inode = adfs_alloc_inode,
+ .destroy_inode = adfs_destroy_inode,
+ .drop_inode = generic_delete_inode,
+ .write_inode = adfs_write_inode,
+ .put_super = adfs_put_super,
+ .statfs = adfs_statfs,
+ .remount_fs = adfs_remount,
+ .show_options = adfs_show_options,
+};
+
+static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
+{
+ struct adfs_discmap *dm;
+ unsigned int map_addr, zone_size, nzones;
+ int i, zone;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ nzones = asb->s_map_size;
+ zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
+ map_addr = (nzones >> 1) * zone_size -
+ ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
+ map_addr = signed_asl(map_addr, asb->s_map2blk);
+
+ asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
+
+ dm = kmalloc_array(nzones, sizeof(*dm), GFP_KERNEL);
+ if (dm == NULL) {
+ adfs_error(sb, "not enough memory");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ for (zone = 0; zone < nzones; zone++, map_addr++) {
+ dm[zone].dm_startbit = 0;
+ dm[zone].dm_endbit = zone_size;
+ dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
+ dm[zone].dm_bh = sb_bread(sb, map_addr);
+
+ if (!dm[zone].dm_bh) {
+ adfs_error(sb, "unable to read map");
+ goto error_free;
+ }
+ }
+
+ /* adjust the limits for the first and last map zones */
+ i = zone - 1;
+ dm[0].dm_startblk = 0;
+ dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
+ dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
+ (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
+ (ADFS_DR_SIZE_BITS - i * zone_size);
+
+ if (adfs_checkmap(sb, dm))
+ return dm;
+
+ adfs_error(sb, "map corrupted");
+
+error_free:
+ while (--zone >= 0)
+ brelse(dm[zone].dm_bh);
+
+ kfree(dm);
+ return ERR_PTR(-EIO);
+}
+
+static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
+{
+ unsigned long discsize;
+
+ discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
+ discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
+
+ return discsize;
+}
+
+static int adfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct adfs_discrecord *dr;
+ struct buffer_head *bh;
+ struct object_info root_obj;
+ unsigned char *b_data;
+ unsigned int blocksize;
+ struct adfs_sb_info *asb;
+ struct inode *root;
+ int ret = -EINVAL;
+
+ sb->s_flags |= SB_NODIRATIME;
+
+ asb = kzalloc(sizeof(*asb), GFP_KERNEL);
+ if (!asb)
+ return -ENOMEM;
+ sb->s_fs_info = asb;
+
+ /* set default options */
+ asb->s_uid = GLOBAL_ROOT_UID;
+ asb->s_gid = GLOBAL_ROOT_GID;
+ asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
+ asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
+ asb->s_ftsuffix = 0;
+
+ if (parse_options(sb, data))
+ goto error;
+
+ sb_set_blocksize(sb, BLOCK_SIZE);
+ if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
+ adfs_error(sb, "unable to read superblock");
+ ret = -EIO;
+ goto error;
+ }
+
+ b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
+
+ if (adfs_checkbblk(b_data)) {
+ if (!silent)
+ printk("VFS: Can't find an adfs filesystem on dev "
+ "%s.\n", sb->s_id);
+ ret = -EINVAL;
+ goto error_free_bh;
+ }
+
+ dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
+
+ /*
+ * Do some sanity checks on the ADFS disc record
+ */
+ if (adfs_checkdiscrecord(dr)) {
+ if (!silent)
+ printk("VPS: Can't find an adfs filesystem on dev "
+ "%s.\n", sb->s_id);
+ ret = -EINVAL;
+ goto error_free_bh;
+ }
+
+ blocksize = 1 << dr->log2secsize;
+ brelse(bh);
+
+ if (sb_set_blocksize(sb, blocksize)) {
+ bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
+ if (!bh) {
+ adfs_error(sb, "couldn't read superblock on "
+ "2nd try.");
+ ret = -EIO;
+ goto error;
+ }
+ b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
+ if (adfs_checkbblk(b_data)) {
+ adfs_error(sb, "disc record mismatch, very weird!");
+ ret = -EINVAL;
+ goto error_free_bh;
+ }
+ dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
+ } else {
+ if (!silent)
+ printk(KERN_ERR "VFS: Unsupported blocksize on dev "
+ "%s.\n", sb->s_id);
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /*
+ * blocksize on this device should now be set to the ADFS log2secsize
+ */
+
+ sb->s_magic = ADFS_SUPER_MAGIC;
+ asb->s_idlen = dr->idlen;
+ asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
+ asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
+ asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
+ asb->s_version = dr->format_version;
+ asb->s_log2sharesize = dr->log2sharesize;
+
+ asb->s_map = adfs_read_map(sb, dr);
+ if (IS_ERR(asb->s_map)) {
+ ret = PTR_ERR(asb->s_map);
+ goto error_free_bh;
+ }
+
+ brelse(bh);
+
+ /*
+ * set up enough so that we can read an inode
+ */
+ sb->s_op = &adfs_sops;
+
+ dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
+
+ root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
+ root_obj.name_len = 0;
+ /* Set root object date as 01 Jan 1987 00:00:00 */
+ root_obj.loadaddr = 0xfff0003f;
+ root_obj.execaddr = 0xec22c000;
+ root_obj.size = ADFS_NEWDIR_SIZE;
+ root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
+ ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
+ root_obj.filetype = -1;
+
+ /*
+ * If this is a F+ disk with variable length directories,
+ * get the root_size from the disc record.
+ */
+ if (asb->s_version) {
+ root_obj.size = le32_to_cpu(dr->root_size);
+ asb->s_dir = &adfs_fplus_dir_ops;
+ asb->s_namelen = ADFS_FPLUS_NAME_LEN;
+ } else {
+ asb->s_dir = &adfs_f_dir_ops;
+ asb->s_namelen = ADFS_F_NAME_LEN;
+ }
+ /*
+ * ,xyz hex filetype suffix may be added by driver
+ * to files that have valid RISC OS filetype
+ */
+ if (asb->s_ftsuffix)
+ asb->s_namelen += 4;
+
+ sb->s_d_op = &adfs_dentry_operations;
+ root = adfs_iget(sb, &root_obj);
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root) {
+ int i;
+ for (i = 0; i < asb->s_map_size; i++)
+ brelse(asb->s_map[i].dm_bh);
+ kfree(asb->s_map);
+ adfs_error(sb, "get root inode failed\n");
+ ret = -EIO;
+ goto error;
+ }
+ return 0;
+
+error_free_bh:
+ brelse(bh);
+error:
+ sb->s_fs_info = NULL;
+ kfree(asb);
+ return ret;
+}
+
+static struct dentry *adfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
+}
+
+static struct file_system_type adfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "adfs",
+ .mount = adfs_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("adfs");
+
+static int __init init_adfs_fs(void)
+{
+ int err = init_inodecache();
+ if (err)
+ goto out1;
+ err = register_filesystem(&adfs_fs_type);
+ if (err)
+ goto out;
+ return 0;
+out:
+ destroy_inodecache();
+out1:
+ return err;
+}
+
+static void __exit exit_adfs_fs(void)
+{
+ unregister_filesystem(&adfs_fs_type);
+ destroy_inodecache();
+}
+
+module_init(init_adfs_fs)
+module_exit(exit_adfs_fs)
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 12:42:26 +0000