diff options
Diffstat (limited to 'fs/isofs/isofs.h')
| -rw-r--r-- | fs/isofs/isofs.h | 201 |
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; |