183 lines
4.9 KiB
C
183 lines
4.9 KiB
C
#include <linux/fs.h>
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#include <linux/adfs_fs.h>
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/* Internal data structures for ADFS */
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#define ADFS_FREE_FRAG 0
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#define ADFS_BAD_FRAG 1
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#define ADFS_ROOT_FRAG 2
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#define ADFS_NDA_OWNER_READ (1 << 0)
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#define ADFS_NDA_OWNER_WRITE (1 << 1)
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#define ADFS_NDA_LOCKED (1 << 2)
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#define ADFS_NDA_DIRECTORY (1 << 3)
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#define ADFS_NDA_EXECUTE (1 << 4)
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#define ADFS_NDA_PUBLIC_READ (1 << 5)
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#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
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#include "dir_f.h"
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struct buffer_head;
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/*
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* adfs file system inode data in memory
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*/
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struct adfs_inode_info {
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loff_t mmu_private;
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unsigned long parent_id; /* object id of parent */
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__u32 loadaddr; /* RISC OS load address */
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__u32 execaddr; /* RISC OS exec address */
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unsigned int filetype; /* RISC OS file type */
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unsigned int attr; /* RISC OS permissions */
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unsigned int stamped:1; /* RISC OS file has date/time */
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struct inode vfs_inode;
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};
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/*
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* Forward-declare this
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*/
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struct adfs_discmap;
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struct adfs_dir_ops;
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/*
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* ADFS file system superblock data in memory
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*/
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struct adfs_sb_info {
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struct adfs_discmap *s_map; /* bh list containing map */
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struct adfs_dir_ops *s_dir; /* directory operations */
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uid_t s_uid; /* owner uid */
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gid_t s_gid; /* owner gid */
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umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
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umode_t s_other_mask; /* ADFS other perm -> unix perm */
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__u32 s_ids_per_zone; /* max. no ids in one zone */
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__u32 s_idlen; /* length of ID in map */
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__u32 s_map_size; /* sector size of a map */
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unsigned long s_size; /* total size (in blocks) of this fs */
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signed int s_map2blk; /* shift left by this for map->sector */
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unsigned int s_log2sharesize;/* log2 share size */
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__le32 s_version; /* disc format version */
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unsigned int s_namelen; /* maximum number of characters in name */
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};
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static inline struct adfs_sb_info *ADFS_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 adfs_inode_info *ADFS_I(struct inode *inode)
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{
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return container_of(inode, struct adfs_inode_info, vfs_inode);
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}
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/*
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* Directory handling
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*/
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struct adfs_dir {
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struct super_block *sb;
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int nr_buffers;
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struct buffer_head *bh[4];
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unsigned int pos;
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unsigned int parent_id;
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struct adfs_dirheader dirhead;
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union adfs_dirtail dirtail;
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};
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/*
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* This is the overall maximum name length
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*/
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#define ADFS_MAX_NAME_LEN 256
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struct object_info {
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__u32 parent_id; /* parent object id */
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__u32 file_id; /* object id */
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__u32 loadaddr; /* load address */
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__u32 execaddr; /* execution address */
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__u32 size; /* size */
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__u8 attr; /* RISC OS attributes */
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unsigned char name_len; /* name length */
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char name[ADFS_MAX_NAME_LEN];/* file name */
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};
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struct adfs_dir_ops {
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int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
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int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
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int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
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int (*update)(struct adfs_dir *dir, struct object_info *obj);
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int (*create)(struct adfs_dir *dir, struct object_info *obj);
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int (*remove)(struct adfs_dir *dir, struct object_info *obj);
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int (*sync)(struct adfs_dir *dir);
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void (*free)(struct adfs_dir *dir);
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};
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struct adfs_discmap {
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struct buffer_head *dm_bh;
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__u32 dm_startblk;
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unsigned int dm_startbit;
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unsigned int dm_endbit;
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};
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/* Inode stuff */
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struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
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int adfs_write_inode(struct inode *inode,int unused);
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int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
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/* map.c */
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extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
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extern unsigned int adfs_map_free(struct super_block *sb);
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/* Misc */
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void __adfs_error(struct super_block *sb, const char *function,
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const char *fmt, ...);
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#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
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/* super.c */
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/*
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* Inodes and file operations
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*/
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/* dir_*.c */
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extern const struct inode_operations adfs_dir_inode_operations;
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extern const struct file_operations adfs_dir_operations;
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extern const struct dentry_operations adfs_dentry_operations;
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extern struct adfs_dir_ops adfs_f_dir_ops;
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extern struct adfs_dir_ops adfs_fplus_dir_ops;
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extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
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int wait);
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/* file.c */
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extern const struct inode_operations adfs_file_inode_operations;
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extern const struct file_operations adfs_file_operations;
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static inline __u32 signed_asl(__u32 val, signed int shift)
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{
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if (shift >= 0)
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val <<= shift;
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else
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val >>= -shift;
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return val;
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}
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/*
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* Calculate the address of a block in an object given the block offset
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* and the object identity.
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*
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* The root directory ID should always be looked up in the map [3.4]
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*/
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static inline int
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__adfs_block_map(struct super_block *sb, unsigned int object_id,
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unsigned int block)
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{
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if (object_id & 255) {
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unsigned int off;
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off = (object_id & 255) - 1;
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block += off << ADFS_SB(sb)->s_log2sharesize;
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}
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return adfs_map_lookup(sb, object_id >> 8, block);
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}
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