1 files changed, 201 insertions, 0 deletions
diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
new file mode 100644
index 000000000..dcdc191ed
--- /dev/null
+++ b/fs/isofs/isofs.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/iso_fs.h>
+#include <asm/unaligned.h>
+
+enum isofs_file_format {
+	isofs_file_normal = 0,
+	isofs_file_sparse = 1,
+	isofs_file_compressed = 2,
+};
+	
+/*
+ * iso fs inode data in memory
+ */
+struct iso_inode_info {
+	unsigned long i_iget5_block;
+	unsigned long i_iget5_offset;
+	unsigned int i_first_extent;
+	unsigned char i_file_format;
+	unsigned char i_format_parm[3];
+	unsigned long i_next_section_block;
+	unsigned long i_next_section_offset;
+	off_t i_section_size;
+	struct inode vfs_inode;
+};
+
+/*
+ * iso9660 super-block data in memory
+ */
+struct isofs_sb_info {
+	unsigned long s_ninodes;
+	unsigned long s_nzones;
+	unsigned long s_firstdatazone;
+	unsigned long s_log_zone_size;
+	unsigned long s_max_size;
+	
+	int           s_rock_offset; /* offset of SUSP fields within SU area */
+	s32           s_sbsector;
+	unsigned char s_joliet_level;
+	unsigned char s_mapping;
+	unsigned char s_check;
+	unsigned char s_session;
+	unsigned int  s_high_sierra:1;
+	unsigned int  s_rock:2;
+	unsigned int  s_cruft:1; /* Broken disks with high byte of length
+				  * containing junk */
+	unsigned int  s_nocompress:1;
+	unsigned int  s_hide:1;
+	unsigned int  s_showassoc:1;
+	unsigned int  s_overriderockperm:1;
+	unsigned int  s_uid_set:1;
+	unsigned int  s_gid_set:1;
+
+	umode_t s_fmode;
+	umode_t s_dmode;
+	kgid_t s_gid;
+	kuid_t s_uid;
+	struct nls_table *s_nls_iocharset; /* Native language support table */
+};
+
+#define ISOFS_INVALID_MODE ((umode_t) -1)
+
+static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
+{
+	return container_of(inode, struct iso_inode_info, vfs_inode);
+}
+
+static inline int isonum_711(u8 *p)
+{
+	return *p;
+}
+static inline int isonum_712(s8 *p)
+{
+	return *p;
+}
+static inline unsigned int isonum_721(u8 *p)
+{
+	return get_unaligned_le16(p);
+}
+static inline unsigned int isonum_722(u8 *p)
+{
+	return get_unaligned_be16(p);
+}
+static inline unsigned int isonum_723(u8 *p)
+{
+	/* Ignore bigendian datum due to broken mastering programs */
+	return get_unaligned_le16(p);
+}
+static inline unsigned int isonum_731(u8 *p)
+{
+	return get_unaligned_le32(p);
+}
+static inline unsigned int isonum_732(u8 *p)
+{
+	return get_unaligned_be32(p);
+}
+static inline unsigned int isonum_733(u8 *p)
+{
+	/* Ignore bigendian datum due to broken mastering programs */
+	return get_unaligned_le32(p);
+}
+extern int iso_date(u8 *, int);
+
+struct inode;		/* To make gcc happy */
+
+extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *, int relocated);
+extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
+extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
+
+int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
+int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
+
+extern struct dentry *isofs_lookup(struct inode *, struct dentry *, unsigned int flags);
+extern struct buffer_head *isofs_bread(struct inode *, sector_t);
+extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
+
+struct inode *__isofs_iget(struct super_block *sb,
+			   unsigned long block,
+			   unsigned long offset,
+			   int relocated);
+
+static inline struct inode *isofs_iget(struct super_block *sb,
+				       unsigned long block,
+				       unsigned long offset)
+{
+	return __isofs_iget(sb, block, offset, 0);
+}
+
+static inline struct inode *isofs_iget_reloc(struct super_block *sb,
+					     unsigned long block,
+					     unsigned long offset)
+{
+	return __isofs_iget(sb, block, offset, 1);
+}
+
+/* Because the inode number is no longer relevant to finding the
+ * underlying meta-data for an inode, we are free to choose a more
+ * convenient 32-bit number as the inode number.  The inode numbering
+ * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
+static inline unsigned long isofs_get_ino(unsigned long block,
+					  unsigned long offset,
+					  unsigned long bufbits)
+{
+	return (block << (bufbits - 5)) | (offset >> 5);
+}
+
+/* Every directory can have many redundant directory entries scattered
+ * throughout the directory tree.  First there is the directory entry
+ * with the name of the directory stored in the parent directory.
+ * Then, there is the "." directory entry stored in the directory
+ * itself.  Finally, there are possibly many ".." directory entries
+ * stored in all the subdirectories.
+ *
+ * In order for the NFS get_parent() method to work and for the
+ * general consistency of the dcache, we need to make sure the
+ * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
+ * the many redundant entries for each directory.  We normalize the
+ * block and offset by always making them point to the "."  directory.
+ *
+ * Notice that we do not use the entry for the directory with the name
+ * that is located in the parent directory.  Even though choosing this
+ * first directory is more natural, it is much easier to find the "."
+ * entry in the NFS get_parent() method because it is implicitly
+ * encoded in the "extent + ext_attr_length" fields of _all_ the
+ * redundant entries for the directory.  Thus, it can always be
+ * reached regardless of which directory entry you have in hand.
+ *
+ * This works because the "." entry is simply the first directory
+ * record when you start reading the file that holds all the directory
+ * records, and this file starts at "extent + ext_attr_length" blocks.
+ * Because the "." entry is always the first entry listed in the
+ * directories file, the normalized "offset" value is always 0.
+ *
+ * You should pass the directory entry in "de".  On return, "block"
+ * and "offset" will hold normalized values.  Only directories are
+ * affected making it safe to call even for non-directory file
+ * types. */
+static inline void
+isofs_normalize_block_and_offset(struct iso_directory_record* de,
+				 unsigned long *block,
+				 unsigned long *offset)
+{
+	/* Only directories are normalized. */
+	if (de->flags[0] & 2) {
+		*offset = 0;
+		*block = (unsigned long)isonum_733(de->extent)
+			+ (unsigned long)isonum_711(de->ext_attr_length);
+	}
+}
+
+extern const struct inode_operations isofs_dir_inode_operations;
+extern const struct file_operations isofs_dir_operations;
+extern const struct address_space_operations isofs_symlink_aops;
+extern const struct export_operations isofs_export_ops;