1 files changed, 502 insertions, 0 deletions

diff --git a/fs/adfs/super.c b/fs/adfs/super.c
new file mode 100644
index 000000000..888aa81a6
--- /dev/null
+++ b/fs/adfs/super.c
@@ -0,0 +1,502 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/fs/adfs/super.c
+ *
+ *  Copyright (C) 1997-1999 Russell King
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs_parser.h>
+#include <linux/fs_context.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/statfs.h>
+#include <linux/user_namespace.h>
+#include <linux/blkdev.h>
+#include "adfs.h"
+#include "dir_f.h"
+#include "dir_fplus.h"
+
+#define ADFS_SB_FLAGS SB_NOATIME
+
+#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, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %pV\n",
+		sb->s_id, function ? ": " : "",
+		function ? function : "", &vaf);
+
+	va_end(args);
+}
+
+void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+	printk("%sADFS-fs (%s): %pV\n", pfx, sb->s_id, &vaf);
+	va_end(args);
+}
+
+static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
+{
+	unsigned int max_idlen;
+	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;
+
+	/*
+	 * Maximum idlen is limited to 16 bits for new directories by
+	 * the three-byte storage of an indirect disc address.  For
+	 * big directories, idlen must be no greater than 19 v2 [1.0]
+	 */
+	max_idlen = dr->format_version ? 19 : 16;
+	if (dr->idlen > max_idlen)
+		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 void adfs_put_super(struct super_block *sb)
+{
+	adfs_free_map(sb);
+}
+
+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};
+
+static const struct fs_parameter_spec adfs_param_spec[] = {
+	fsparam_uid	("uid",		Opt_uid),
+	fsparam_gid	("gid",		Opt_gid),
+	fsparam_u32oct	("ownmask",	Opt_ownmask),
+	fsparam_u32oct	("othmask",	Opt_othmask),
+	fsparam_u32	("ftsuffix",	Opt_ftsuffix),
+	{}
+};
+
+static int adfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct adfs_sb_info *asb = fc->s_fs_info;
+	struct fs_parse_result result;
+	int opt;
+
+	opt = fs_parse(fc, adfs_param_spec, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_uid:
+		asb->s_uid = result.uid;
+		break;
+	case Opt_gid:
+		asb->s_gid = result.gid;
+		break;
+	case Opt_ownmask:
+		asb->s_owner_mask = result.uint_32;
+		break;
+	case Opt_othmask:
+		asb->s_other_mask = result.uint_32;
+		break;
+	case Opt_ftsuffix:
+		asb->s_ftsuffix = result.uint_32;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int adfs_reconfigure(struct fs_context *fc)
+{
+	struct adfs_sb_info *new_asb = fc->s_fs_info;
+	struct adfs_sb_info *asb = ADFS_SB(fc->root->d_sb);
+
+	sync_filesystem(fc->root->d_sb);
+	fc->sb_flags |= ADFS_SB_FLAGS;
+
+	/* Structure copy newly parsed options */
+	*asb = *new_asb;
+
+	return 0;
+}
+
+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);
+
+	adfs_map_statfs(sb, buf);
+
+	buf->f_type    = ADFS_SUPER_MAGIC;
+	buf->f_namelen = sbi->s_namelen;
+	buf->f_bsize   = sb->s_blocksize;
+	buf->f_ffree   = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
+	buf->f_fsid    = u64_to_fsid(id);
+
+	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 = alloc_inode_sb(sb, adfs_inode_cachep, GFP_KERNEL);
+	if (!ei)
+		return NULL;
+	return &ei->vfs_inode;
+}
+
+static void adfs_free_inode(struct inode *inode)
+{
+	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
+}
+
+static int adfs_drop_inode(struct inode *inode)
+{
+	/* always drop inodes if we are read-only */
+	return !IS_ENABLED(CONFIG_ADFS_FS_RW) || IS_RDONLY(inode);
+}
+
+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_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,
+	.free_inode	= adfs_free_inode,
+	.drop_inode	= adfs_drop_inode,
+	.write_inode	= adfs_write_inode,
+	.put_super	= adfs_put_super,
+	.statfs		= adfs_statfs,
+	.show_options	= adfs_show_options,
+};
+
+static int adfs_probe(struct super_block *sb, unsigned int offset, int silent,
+		      int (*validate)(struct super_block *sb,
+				      struct buffer_head *bh,
+				      struct adfs_discrecord **bhp))
+{
+	struct adfs_sb_info *asb = ADFS_SB(sb);
+	struct adfs_discrecord *dr;
+	struct buffer_head *bh;
+	unsigned int blocksize = BLOCK_SIZE;
+	int ret, try;
+
+	for (try = 0; try < 2; try++) {
+		/* try to set the requested block size */
+		if (sb->s_blocksize != blocksize &&
+		    !sb_set_blocksize(sb, blocksize)) {
+			if (!silent)
+				adfs_msg(sb, KERN_ERR,
+					 "error: unsupported blocksize");
+			return -EINVAL;
+		}
+
+		/* read the buffer */
+		bh = sb_bread(sb, offset >> sb->s_blocksize_bits);
+		if (!bh) {
+			adfs_msg(sb, KERN_ERR,
+				 "error: unable to read block %u, try %d",
+				 offset >> sb->s_blocksize_bits, try);
+			return -EIO;
+		}
+
+		/* validate it */
+		ret = validate(sb, bh, &dr);
+		if (ret) {
+			brelse(bh);
+			return ret;
+		}
+
+		/* does the block size match the filesystem block size? */
+		blocksize = 1 << dr->log2secsize;
+		if (sb->s_blocksize == blocksize) {
+			asb->s_map = adfs_read_map(sb, dr);
+			brelse(bh);
+			return PTR_ERR_OR_ZERO(asb->s_map);
+		}
+
+		brelse(bh);
+	}
+
+	return -EIO;
+}
+
+static int adfs_validate_bblk(struct super_block *sb, struct buffer_head *bh,
+			      struct adfs_discrecord **drp)
+{
+	struct adfs_discrecord *dr;
+	unsigned char *b_data;
+
+	b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
+	if (adfs_checkbblk(b_data))
+		return -EILSEQ;
+
+	/* Do some sanity checks on the ADFS disc record */
+	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
+	if (adfs_checkdiscrecord(dr))
+		return -EILSEQ;
+
+	if ((dr->nzones | dr->nzones_high << 8) == 0)
+		return -EILSEQ;
+
+	*drp = dr;
+	return 0;
+}
+
+static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh,
+			      struct adfs_discrecord **drp)
+{
+	struct adfs_discrecord *dr;
+
+	/* Do some sanity checks on the ADFS disc record */
+	dr = (struct adfs_discrecord *)(bh->b_data + 4);
+	if (adfs_checkdiscrecord(dr) || dr->nzones_high || dr->nzones != 1)
+		return -EILSEQ;
+
+	*drp = dr;
+	return 0;
+}
+
+static int adfs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+	struct adfs_discrecord *dr;
+	struct object_info root_obj;
+	struct adfs_sb_info *asb = sb->s_fs_info;
+	struct inode *root;
+	int ret = -EINVAL;
+	int silent = fc->sb_flags & SB_SILENT;
+
+	sb->s_flags |= ADFS_SB_FLAGS;
+
+	sb->s_fs_info = asb;
+	sb->s_magic = ADFS_SUPER_MAGIC;
+	sb->s_time_gran = 10000000;
+
+	/* Try to probe the filesystem boot block */
+	ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk);
+	if (ret == -EILSEQ)
+		ret = adfs_probe(sb, 0, silent, adfs_validate_dr0);
+	if (ret == -EILSEQ) {
+		if (!silent)
+			adfs_msg(sb, KERN_ERR,
+				 "error: can't find an ADFS filesystem on dev %s.",
+				 sb->s_id);
+		ret = -EINVAL;
+	}
+	if (ret)
+		return ret;
+
+	/* set up enough so that we can read an inode */
+	sb->s_op = &adfs_sops;
+
+	dr = adfs_map_discrecord(asb->s_map);
+
+	root_obj.parent_id = root_obj.indaddr = 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;
+
+	/*
+	 * If this is a F+ disk with variable length directories,
+	 * get the root_size from the disc record.
+	 */
+	if (dr->format_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;
+
+	set_default_d_op(sb, &adfs_dentry_operations);
+	root = adfs_iget(sb, &root_obj);
+	sb->s_root = d_make_root(root);
+	if (!sb->s_root) {
+		adfs_free_map(sb);
+		adfs_error(sb, "get root inode failed\n");
+		return -EIO;
+	}
+	return 0;
+}
+
+static int adfs_get_tree(struct fs_context *fc)
+{
+	return get_tree_bdev(fc, adfs_fill_super);
+}
+
+static void adfs_free_fc(struct fs_context *fc)
+{
+	struct adfs_context *asb = fc->s_fs_info;
+
+	kfree(asb);
+}
+
+static const struct fs_context_operations adfs_context_ops = {
+	.parse_param	= adfs_parse_param,
+	.get_tree	= adfs_get_tree,
+	.reconfigure	= adfs_reconfigure,
+	.free		= adfs_free_fc,
+};
+
+static int adfs_init_fs_context(struct fs_context *fc)
+{
+	struct adfs_sb_info *asb;
+
+	asb = kzalloc_obj(struct adfs_sb_info);
+	if (!asb)
+		return -ENOMEM;
+
+	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
+		struct super_block *sb = fc->root->d_sb;
+		struct adfs_sb_info *old_asb = ADFS_SB(sb);
+
+		/* structure copy existing options before parsing */
+		*asb = *old_asb;
+	} else {
+		/* 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;
+	}
+
+	fc->ops = &adfs_context_ops;
+	fc->s_fs_info = asb;
+
+	return 0;
+}
+
+static void adfs_kill_sb(struct super_block *sb)
+{
+	struct adfs_sb_info *asb = ADFS_SB(sb);
+
+	kill_block_super(sb);
+
+	kfree_rcu(asb, rcu);
+}
+
+static struct file_system_type adfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "adfs",
+	.kill_sb	= adfs_kill_sb,
+	.fs_flags	= FS_REQUIRES_DEV,
+	.init_fs_context = adfs_init_fs_context,
+	.parameters	= adfs_param_spec,
+};
+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_DESCRIPTION("Acorn Disc Filing System");
+MODULE_LICENSE("GPL");