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-rw-r--r--fs/adfs/super.c494
1 files changed, 494 insertions, 0 deletions
diff --git a/fs/adfs/super.c b/fs/adfs/super.c
new file mode 100644
index 000000000..e8bfc3823
--- /dev/null
+++ b/fs/adfs/super.c
@@ -0,0 +1,494 @@
+// 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/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 <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)
+{
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ adfs_free_map(sb);
+ 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, struct adfs_sb_info *asb,
+ char *options)
+{
+ char *p;
+ 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:
+ adfs_msg(sb, KERN_ERR,
+ "unrecognised mount option \"%s\" or missing value",
+ p);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int adfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct adfs_sb_info temp_asb;
+ int ret;
+
+ sync_filesystem(sb);
+ *flags |= ADFS_SB_FLAGS;
+
+ temp_asb = *ADFS_SB(sb);
+ ret = parse_options(sb, &temp_asb, data);
+ if (ret == 0)
+ *ADFS_SB(sb) = temp_asb;
+
+ return ret;
+}
+
+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_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,
+ .free_inode = adfs_free_inode,
+ .drop_inode = adfs_drop_inode,
+ .write_inode = adfs_write_inode,
+ .put_super = adfs_put_super,
+ .statfs = adfs_statfs,
+ .remount_fs = adfs_remount,
+ .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;
+
+ *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, void *data, int silent)
+{
+ struct adfs_discrecord *dr;
+ struct object_info root_obj;
+ struct adfs_sb_info *asb;
+ struct inode *root;
+ int ret = -EINVAL;
+
+ sb->s_flags |= ADFS_SB_FLAGS;
+
+ asb = kzalloc(sizeof(*asb), GFP_KERNEL);
+ if (!asb)
+ return -ENOMEM;
+
+ sb->s_fs_info = asb;
+ sb->s_magic = ADFS_SUPER_MAGIC;
+ sb->s_time_gran = 10000000;
+
+ /* 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, asb, data))
+ goto error;
+
+ /* 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)
+ goto error;
+
+ /* 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;
+
+ sb->s_d_op = &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");
+ ret = -EIO;
+ goto error;
+ }
+ return 0;
+
+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 2024-11-28 14:32:13 +0000