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202 lines
6.4 KiB
202 lines
6.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <linux/fs.h> |
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#include <linux/buffer_head.h> |
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#include <linux/exportfs.h> |
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#include <linux/iso_fs.h> |
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#include <asm/unaligned.h> |
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enum isofs_file_format { |
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isofs_file_normal = 0, |
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isofs_file_sparse = 1, |
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isofs_file_compressed = 2, |
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}; |
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/* |
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* iso fs inode data in memory |
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*/ |
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struct iso_inode_info { |
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unsigned long i_iget5_block; |
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unsigned long i_iget5_offset; |
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unsigned int i_first_extent; |
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unsigned char i_file_format; |
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unsigned char i_format_parm[3]; |
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unsigned long i_next_section_block; |
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unsigned long i_next_section_offset; |
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off_t i_section_size; |
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struct inode vfs_inode; |
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}; |
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/* |
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* iso9660 super-block data in memory |
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*/ |
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struct isofs_sb_info { |
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unsigned long s_ninodes; |
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unsigned long s_nzones; |
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unsigned long s_firstdatazone; |
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unsigned long s_log_zone_size; |
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unsigned long s_max_size; |
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int s_rock_offset; /* offset of SUSP fields within SU area */ |
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s32 s_sbsector; |
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unsigned char s_joliet_level; |
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unsigned char s_mapping; |
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unsigned char s_check; |
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unsigned char s_session; |
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unsigned int s_high_sierra:1; |
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unsigned int s_rock:2; |
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unsigned int s_utf8:1; |
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unsigned int s_cruft:1; /* Broken disks with high byte of length |
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* containing junk */ |
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unsigned int s_nocompress:1; |
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unsigned int s_hide:1; |
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unsigned int s_showassoc:1; |
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unsigned int s_overriderockperm:1; |
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unsigned int s_uid_set:1; |
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unsigned int s_gid_set:1; |
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umode_t s_fmode; |
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umode_t s_dmode; |
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kgid_t s_gid; |
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kuid_t s_uid; |
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struct nls_table *s_nls_iocharset; /* Native language support table */ |
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}; |
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#define ISOFS_INVALID_MODE ((umode_t) -1) |
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static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) |
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{ |
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return sb->s_fs_info; |
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} |
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static inline struct iso_inode_info *ISOFS_I(struct inode *inode) |
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{ |
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return container_of(inode, struct iso_inode_info, vfs_inode); |
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} |
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static inline int isonum_711(u8 *p) |
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{ |
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return *p; |
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} |
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static inline int isonum_712(s8 *p) |
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{ |
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return *p; |
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} |
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static inline unsigned int isonum_721(u8 *p) |
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{ |
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return get_unaligned_le16(p); |
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} |
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static inline unsigned int isonum_722(u8 *p) |
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{ |
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return get_unaligned_be16(p); |
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} |
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static inline unsigned int isonum_723(u8 *p) |
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{ |
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/* Ignore bigendian datum due to broken mastering programs */ |
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return get_unaligned_le16(p); |
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} |
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static inline unsigned int isonum_731(u8 *p) |
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{ |
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return get_unaligned_le32(p); |
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} |
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static inline unsigned int isonum_732(u8 *p) |
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{ |
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return get_unaligned_be32(p); |
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} |
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static inline unsigned int isonum_733(u8 *p) |
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{ |
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/* Ignore bigendian datum due to broken mastering programs */ |
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return get_unaligned_le32(p); |
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} |
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extern int iso_date(u8 *, int); |
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struct inode; /* To make gcc happy */ |
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extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *, int relocated); |
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extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); |
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extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); |
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int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); |
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int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); |
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extern struct dentry *isofs_lookup(struct inode *, struct dentry *, unsigned int flags); |
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extern struct buffer_head *isofs_bread(struct inode *, sector_t); |
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extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); |
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struct inode *__isofs_iget(struct super_block *sb, |
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unsigned long block, |
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unsigned long offset, |
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int relocated); |
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static inline struct inode *isofs_iget(struct super_block *sb, |
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unsigned long block, |
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unsigned long offset) |
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{ |
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return __isofs_iget(sb, block, offset, 0); |
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} |
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static inline struct inode *isofs_iget_reloc(struct super_block *sb, |
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unsigned long block, |
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unsigned long offset) |
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{ |
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return __isofs_iget(sb, block, offset, 1); |
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} |
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/* Because the inode number is no longer relevant to finding the |
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* underlying meta-data for an inode, we are free to choose a more |
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* convenient 32-bit number as the inode number. The inode numbering |
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* scheme was recommended by Sergey Vlasov and Eric Lammerts. */ |
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static inline unsigned long isofs_get_ino(unsigned long block, |
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unsigned long offset, |
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unsigned long bufbits) |
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{ |
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return (block << (bufbits - 5)) | (offset >> 5); |
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} |
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/* Every directory can have many redundant directory entries scattered |
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* throughout the directory tree. First there is the directory entry |
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* with the name of the directory stored in the parent directory. |
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* Then, there is the "." directory entry stored in the directory |
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* itself. Finally, there are possibly many ".." directory entries |
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* stored in all the subdirectories. |
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* |
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* In order for the NFS get_parent() method to work and for the |
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* general consistency of the dcache, we need to make sure the |
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* "i_iget5_block" and "i_iget5_offset" all point to exactly one of |
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* the many redundant entries for each directory. We normalize the |
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* block and offset by always making them point to the "." directory. |
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* |
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* Notice that we do not use the entry for the directory with the name |
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* that is located in the parent directory. Even though choosing this |
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* first directory is more natural, it is much easier to find the "." |
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* entry in the NFS get_parent() method because it is implicitly |
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* encoded in the "extent + ext_attr_length" fields of _all_ the |
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* redundant entries for the directory. Thus, it can always be |
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* reached regardless of which directory entry you have in hand. |
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* |
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* This works because the "." entry is simply the first directory |
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* record when you start reading the file that holds all the directory |
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* records, and this file starts at "extent + ext_attr_length" blocks. |
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* Because the "." entry is always the first entry listed in the |
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* directories file, the normalized "offset" value is always 0. |
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* |
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* You should pass the directory entry in "de". On return, "block" |
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* and "offset" will hold normalized values. Only directories are |
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* affected making it safe to call even for non-directory file |
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* types. */ |
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static inline void |
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isofs_normalize_block_and_offset(struct iso_directory_record* de, |
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unsigned long *block, |
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unsigned long *offset) |
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{ |
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/* Only directories are normalized. */ |
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if (de->flags[0] & 2) { |
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*offset = 0; |
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*block = (unsigned long)isonum_733(de->extent) |
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+ (unsigned long)isonum_711(de->ext_attr_length); |
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} |
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} |
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extern const struct inode_operations isofs_dir_inode_operations; |
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extern const struct file_operations isofs_dir_operations; |
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extern const struct address_space_operations isofs_symlink_aops; |
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extern const struct export_operations isofs_export_ops;
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