231 lines
6.5 KiB
C
231 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/buffer_head.h>
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#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_FILETYPE_NONE ((u16)~0)
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/* RISC OS 12-bit filetype is stored in load_address[19:8] */
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static inline u16 adfs_filetype(u32 loadaddr)
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{
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return (loadaddr & 0xfff00000) == 0xfff00000 ?
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(loadaddr >> 8) & 0xfff : ADFS_FILETYPE_NONE;
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}
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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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/*
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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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__u32 parent_id; /* parent indirect disc address */
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__u32 indaddr; /* object indirect disc address */
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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 attr; /* RISC OS permissions */
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struct inode vfs_inode;
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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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static inline bool adfs_inode_is_stamped(struct inode *inode)
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{
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return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000;
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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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union { struct {
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struct adfs_discmap *s_map; /* bh list containing map */
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const struct adfs_dir_ops *s_dir; /* directory operations */
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};
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struct rcu_head rcu; /* used only at shutdown time */
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};
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kuid_t s_uid; /* owner uid */
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kgid_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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int s_ftsuffix; /* ,xyz hex filetype suffix option */
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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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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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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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/*
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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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struct buffer_head **bhs;
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unsigned int pos;
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__u32 parent_id;
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union {
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struct adfs_dirheader *dirhead;
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struct adfs_bigdirheader *bighead;
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};
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union {
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struct adfs_newdirtail *newtail;
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struct adfs_bigdirtail *bigtail;
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};
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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 + 4) /* +4 for ,xyz hex filetype suffix */
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struct object_info {
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__u32 parent_id; /* parent object id */
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__u32 indaddr; /* indirect disc addr */
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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 int 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 indaddr,
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unsigned int size, struct adfs_dir *dir);
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int (*iterate)(struct adfs_dir *dir, struct dir_context *ctx);
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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 (*commit)(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, struct writeback_control *wbc);
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int adfs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
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struct iattr *attr);
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/* map.c */
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int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);
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void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf);
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struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr);
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void adfs_free_map(struct super_block *sb);
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/* Misc */
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__printf(3, 4)
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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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void adfs_msg(struct super_block *sb, const char *pfx, const char *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 const struct adfs_dir_ops adfs_f_dir_ops;
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extern const struct adfs_dir_ops adfs_fplus_dir_ops;
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int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset,
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size_t len);
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int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src,
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size_t len);
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void adfs_dir_relse(struct adfs_dir *dir);
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int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr,
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unsigned int size, struct adfs_dir *dir);
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void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
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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 __adfs_block_map(struct super_block *sb, u32 indaddr,
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unsigned int block)
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{
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if (indaddr & 255) {
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unsigned int off;
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off = (indaddr & 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, indaddr >> 8, block);
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}
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/* Return the disc record from the map */
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static inline
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struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm)
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{
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return (void *)(dm[0].dm_bh->b_data + 4);
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}
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static inline u64 adfs_disc_size(const struct adfs_discrecord *dr)
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{
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return (u64)le32_to_cpu(dr->disc_size_high) << 32 |
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le32_to_cpu(dr->disc_size);
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}
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