313 lines
12 KiB
C
313 lines
12 KiB
C
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#ifndef _ISOFS_FS_H
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#define _ISOFS_FS_H
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#include <linux/types.h>
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/*
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* The isofs filesystem constants/structures
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*/
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/* This part borrowed from the bsd386 isofs */
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#define ISODCL(from, to) (to - from + 1)
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struct iso_volume_descriptor {
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char type[ISODCL(1,1)]; /* 711 */
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char id[ISODCL(2,6)];
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char version[ISODCL(7,7)];
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char data[ISODCL(8,2048)];
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};
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/* volume descriptor types */
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#define ISO_VD_PRIMARY 1
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#define ISO_VD_SUPPLEMENTARY 2
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#define ISO_VD_END 255
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#define ISO_STANDARD_ID "CD001"
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struct iso_primary_descriptor {
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char type [ISODCL ( 1, 1)]; /* 711 */
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char id [ISODCL ( 2, 6)];
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char version [ISODCL ( 7, 7)]; /* 711 */
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char unused1 [ISODCL ( 8, 8)];
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char system_id [ISODCL ( 9, 40)]; /* achars */
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char volume_id [ISODCL ( 41, 72)]; /* dchars */
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char unused2 [ISODCL ( 73, 80)];
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char volume_space_size [ISODCL ( 81, 88)]; /* 733 */
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char unused3 [ISODCL ( 89, 120)];
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char volume_set_size [ISODCL (121, 124)]; /* 723 */
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char volume_sequence_number [ISODCL (125, 128)]; /* 723 */
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char logical_block_size [ISODCL (129, 132)]; /* 723 */
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char path_table_size [ISODCL (133, 140)]; /* 733 */
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char type_l_path_table [ISODCL (141, 144)]; /* 731 */
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char opt_type_l_path_table [ISODCL (145, 148)]; /* 731 */
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char type_m_path_table [ISODCL (149, 152)]; /* 732 */
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char opt_type_m_path_table [ISODCL (153, 156)]; /* 732 */
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char root_directory_record [ISODCL (157, 190)]; /* 9.1 */
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char volume_set_id [ISODCL (191, 318)]; /* dchars */
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char publisher_id [ISODCL (319, 446)]; /* achars */
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char preparer_id [ISODCL (447, 574)]; /* achars */
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char application_id [ISODCL (575, 702)]; /* achars */
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char copyright_file_id [ISODCL (703, 739)]; /* 7.5 dchars */
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char abstract_file_id [ISODCL (740, 776)]; /* 7.5 dchars */
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char bibliographic_file_id [ISODCL (777, 813)]; /* 7.5 dchars */
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char creation_date [ISODCL (814, 830)]; /* 8.4.26.1 */
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char modification_date [ISODCL (831, 847)]; /* 8.4.26.1 */
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char expiration_date [ISODCL (848, 864)]; /* 8.4.26.1 */
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char effective_date [ISODCL (865, 881)]; /* 8.4.26.1 */
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char file_structure_version [ISODCL (882, 882)]; /* 711 */
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char unused4 [ISODCL (883, 883)];
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char application_data [ISODCL (884, 1395)];
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char unused5 [ISODCL (1396, 2048)];
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};
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/* Almost the same as the primary descriptor but two fields are specified */
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struct iso_supplementary_descriptor {
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char type [ISODCL ( 1, 1)]; /* 711 */
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char id [ISODCL ( 2, 6)];
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char version [ISODCL ( 7, 7)]; /* 711 */
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char flags [ISODCL ( 8, 8)]; /* 853 */
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char system_id [ISODCL ( 9, 40)]; /* achars */
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char volume_id [ISODCL ( 41, 72)]; /* dchars */
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char unused2 [ISODCL ( 73, 80)];
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char volume_space_size [ISODCL ( 81, 88)]; /* 733 */
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char escape [ISODCL ( 89, 120)]; /* 856 */
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char volume_set_size [ISODCL (121, 124)]; /* 723 */
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char volume_sequence_number [ISODCL (125, 128)]; /* 723 */
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char logical_block_size [ISODCL (129, 132)]; /* 723 */
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char path_table_size [ISODCL (133, 140)]; /* 733 */
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char type_l_path_table [ISODCL (141, 144)]; /* 731 */
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char opt_type_l_path_table [ISODCL (145, 148)]; /* 731 */
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char type_m_path_table [ISODCL (149, 152)]; /* 732 */
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char opt_type_m_path_table [ISODCL (153, 156)]; /* 732 */
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char root_directory_record [ISODCL (157, 190)]; /* 9.1 */
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char volume_set_id [ISODCL (191, 318)]; /* dchars */
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char publisher_id [ISODCL (319, 446)]; /* achars */
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char preparer_id [ISODCL (447, 574)]; /* achars */
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char application_id [ISODCL (575, 702)]; /* achars */
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char copyright_file_id [ISODCL (703, 739)]; /* 7.5 dchars */
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char abstract_file_id [ISODCL (740, 776)]; /* 7.5 dchars */
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char bibliographic_file_id [ISODCL (777, 813)]; /* 7.5 dchars */
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char creation_date [ISODCL (814, 830)]; /* 8.4.26.1 */
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char modification_date [ISODCL (831, 847)]; /* 8.4.26.1 */
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char expiration_date [ISODCL (848, 864)]; /* 8.4.26.1 */
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char effective_date [ISODCL (865, 881)]; /* 8.4.26.1 */
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char file_structure_version [ISODCL (882, 882)]; /* 711 */
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char unused4 [ISODCL (883, 883)];
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char application_data [ISODCL (884, 1395)];
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char unused5 [ISODCL (1396, 2048)];
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};
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#define HS_STANDARD_ID "CDROM"
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struct hs_volume_descriptor {
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char foo [ISODCL ( 1, 8)]; /* 733 */
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char type [ISODCL ( 9, 9)]; /* 711 */
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char id [ISODCL ( 10, 14)];
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char version [ISODCL ( 15, 15)]; /* 711 */
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char data[ISODCL(16,2048)];
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};
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struct hs_primary_descriptor {
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char foo [ISODCL ( 1, 8)]; /* 733 */
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char type [ISODCL ( 9, 9)]; /* 711 */
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char id [ISODCL ( 10, 14)];
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char version [ISODCL ( 15, 15)]; /* 711 */
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char unused1 [ISODCL ( 16, 16)]; /* 711 */
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char system_id [ISODCL ( 17, 48)]; /* achars */
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char volume_id [ISODCL ( 49, 80)]; /* dchars */
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char unused2 [ISODCL ( 81, 88)]; /* 733 */
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char volume_space_size [ISODCL ( 89, 96)]; /* 733 */
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char unused3 [ISODCL ( 97, 128)]; /* 733 */
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char volume_set_size [ISODCL (129, 132)]; /* 723 */
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char volume_sequence_number [ISODCL (133, 136)]; /* 723 */
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char logical_block_size [ISODCL (137, 140)]; /* 723 */
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char path_table_size [ISODCL (141, 148)]; /* 733 */
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char type_l_path_table [ISODCL (149, 152)]; /* 731 */
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char unused4 [ISODCL (153, 180)]; /* 733 */
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char root_directory_record [ISODCL (181, 214)]; /* 9.1 */
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};
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/* We use this to help us look up the parent inode numbers. */
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struct iso_path_table{
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unsigned char name_len[2]; /* 721 */
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char extent[4]; /* 731 */
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char parent[2]; /* 721 */
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char name[0];
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} __attribute__((packed));
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/* high sierra is identical to iso, except that the date is only 6 bytes, and
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there is an extra reserved byte after the flags */
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struct iso_directory_record {
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char length [ISODCL (1, 1)]; /* 711 */
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char ext_attr_length [ISODCL (2, 2)]; /* 711 */
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char extent [ISODCL (3, 10)]; /* 733 */
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char size [ISODCL (11, 18)]; /* 733 */
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char date [ISODCL (19, 25)]; /* 7 by 711 */
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char flags [ISODCL (26, 26)];
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char file_unit_size [ISODCL (27, 27)]; /* 711 */
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char interleave [ISODCL (28, 28)]; /* 711 */
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char volume_sequence_number [ISODCL (29, 32)]; /* 723 */
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unsigned char name_len [ISODCL (33, 33)]; /* 711 */
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char name [0];
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} __attribute__((packed));
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#define ISOFS_BLOCK_BITS 11
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#define ISOFS_BLOCK_SIZE 2048
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#define ISOFS_BUFFER_SIZE(INODE) ((INODE)->i_sb->s_blocksize)
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#define ISOFS_BUFFER_BITS(INODE) ((INODE)->i_sb->s_blocksize_bits)
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#define ISOFS_SUPER_MAGIC 0x9660
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#ifdef __KERNEL__
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/* Number conversion inlines, named after the section in ISO 9660
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they correspond to. */
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <linux/iso_fs_i.h>
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#include <linux/iso_fs_sb.h>
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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(char *p)
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{
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return *(u8 *)p;
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}
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static inline int isonum_712(char *p)
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{
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return *(s8 *)p;
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}
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static inline unsigned int isonum_721(char *p)
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{
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return le16_to_cpu(get_unaligned((__le16 *)p));
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}
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static inline unsigned int isonum_722(char *p)
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{
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return be16_to_cpu(get_unaligned((__le16 *)p));
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}
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static inline unsigned int isonum_723(char *p)
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{
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/* Ignore bigendian datum due to broken mastering programs */
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return le16_to_cpu(get_unaligned((__le16 *)p));
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}
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static inline unsigned int isonum_731(char *p)
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{
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return le32_to_cpu(get_unaligned((__le32 *)p));
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}
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static inline unsigned int isonum_732(char *p)
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{
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return be32_to_cpu(get_unaligned((__le32 *)p));
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}
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static inline unsigned int isonum_733(char *p)
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{
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/* Ignore bigendian datum due to broken mastering programs */
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return le32_to_cpu(get_unaligned((__le32 *)p));
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}
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extern int iso_date(char *, 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 *);
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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 *, struct nameidata *);
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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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extern 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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/* 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 struct inode_operations isofs_dir_inode_operations;
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extern struct file_operations isofs_dir_operations;
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extern struct address_space_operations isofs_symlink_aops;
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extern struct export_operations isofs_export_ops;
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/* The following macros are used to check for memory leaks. */
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#ifdef LEAK_CHECK
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#define free_s leak_check_free_s
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#define malloc leak_check_malloc
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#define sb_bread leak_check_bread
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#define brelse leak_check_brelse
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extern void * leak_check_malloc(unsigned int size);
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extern void leak_check_free_s(void * obj, int size);
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extern struct buffer_head * leak_check_bread(struct super_block *sb, int block);
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extern void leak_check_brelse(struct buffer_head * bh);
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#endif /* LEAK_CHECK */
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#endif /* __KERNEL__ */
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#endif
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