1 /* Internal data structures for ADFS */ 2 3 #define ADFS_FREE_FRAG 0 4 #define ADFS_BAD_FRAG 1 5 #define ADFS_ROOT_FRAG 2 6 7 #define ADFS_NDA_OWNER_READ (1 << 0) 8 #define ADFS_NDA_OWNER_WRITE (1 << 1) 9 #define ADFS_NDA_LOCKED (1 << 2) 10 #define ADFS_NDA_DIRECTORY (1 << 3) 11 #define ADFS_NDA_EXECUTE (1 << 4) 12 #define ADFS_NDA_PUBLIC_READ (1 << 5) 13 #define ADFS_NDA_PUBLIC_WRITE (1 << 6) 14 15 #include <linux/version.h> 16 #include "dir_f.h" 17 18 struct buffer_head; 19 20 /* 21 * Directory handling 22 */ 23 struct adfs_dir { 24 struct super_block *sb; 25 26 int nr_buffers; 27 struct buffer_head *bh[4]; 28 unsigned int pos; 29 unsigned int parent_id; 30 31 struct adfs_dirheader dirhead; 32 union adfs_dirtail dirtail; 33 }; 34 35 /* 36 * This is the overall maximum name length 37 */ 38 #define ADFS_MAX_NAME_LEN 256 39 struct object_info { 40 __u32 parent_id; /* parent object id */ 41 __u32 file_id; /* object id */ 42 __u32 loadaddr; /* load address */ 43 __u32 execaddr; /* execution address */ 44 __u32 size; /* size */ 45 __u8 attr; /* RISC OS attributes */ 46 unsigned char name_len; /* name length */ 47 char name[ADFS_MAX_NAME_LEN];/* file name */ 48 }; 49 50 struct adfs_dir_ops { 51 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); 52 int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 53 int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 54 int (*update)(struct adfs_dir *dir, struct object_info *obj); 55 int (*create)(struct adfs_dir *dir, struct object_info *obj); 56 int (*remove)(struct adfs_dir *dir, struct object_info *obj); 57 void (*free)(struct adfs_dir *dir); 58 }; 59 60 struct adfs_discmap { 61 struct buffer_head *dm_bh; 62 __u32 dm_startblk; 63 unsigned int dm_startbit; 64 unsigned int dm_endbit; 65 }; 66 67 /* Inode stuff */ 68 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 69 int adfs_write_inode(struct inode *inode,int unused); 70 int adfs_notify_change(struct dentry *dentry, struct iattr *attr); 71 72 /* map.c */ 73 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); 74 extern unsigned int adfs_map_free(struct super_block *sb); 75 76 /* Misc */ 77 void __adfs_error(struct super_block *sb, const char *function, 78 const char *fmt, ...); 79 #define adfs_error(sb, fmt...) __adfs_error(sb, __FUNCTION__, fmt) 80 81 /* super.c */ 82 83 /* 84 * Inodes and file operations 85 */ 86 87 /* dir_*.c */ 88 extern struct inode_operations adfs_dir_inode_operations; 89 extern struct file_operations adfs_dir_operations; 90 extern struct dentry_operations adfs_dentry_operations; 91 extern struct adfs_dir_ops adfs_f_dir_ops; 92 extern struct adfs_dir_ops adfs_fplus_dir_ops; 93 94 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj); 95 96 /* file.c */ 97 extern struct inode_operations adfs_file_inode_operations; 98 extern struct file_operations adfs_file_operations; 99 100 static inline __u32 signed_asl(__u32 val, signed int shift) 101 { 102 if (shift >= 0) 103 val <<= shift; 104 else 105 val >>= -shift; 106 return val; 107 } 108 109 /* 110 * Calculate the address of a block in an object given the block offset 111 * and the object identity. 112 * 113 * The root directory ID should always be looked up in the map [3.4] 114 */ 115 static inline int 116 __adfs_block_map(struct super_block *sb, unsigned int object_id, 117 unsigned int block) 118 { 119 if (object_id & 255) { 120 unsigned int off; 121 122 off = (object_id & 255) - 1; 123 block += off << ADFS_SB(sb)->s_log2sharesize; 124 } 125 126 return adfs_map_lookup(sb, object_id >> 8, block); 127 } 128