1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 21dfdfc94SRussell King #include <linux/buffer_head.h> 3608ba50bSAl Viro #include <linux/fs.h> 4608ba50bSAl Viro #include <linux/adfs_fs.h> 5608ba50bSAl Viro 61da177e4SLinus Torvalds /* Internal data structures for ADFS */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #define ADFS_FREE_FRAG 0 91da177e4SLinus Torvalds #define ADFS_BAD_FRAG 1 101da177e4SLinus Torvalds #define ADFS_ROOT_FRAG 2 111da177e4SLinus Torvalds 12b4ed8f75SRussell King #define ADFS_FILETYPE_NONE ((u16)~0) 13b4ed8f75SRussell King 14b4ed8f75SRussell King /* RISC OS 12-bit filetype is stored in load_address[19:8] */ 15b4ed8f75SRussell King static inline u16 adfs_filetype(u32 loadaddr) 16b4ed8f75SRussell King { 17b4ed8f75SRussell King return (loadaddr & 0xfff00000) == 0xfff00000 ? 18b4ed8f75SRussell King (loadaddr >> 8) & 0xfff : ADFS_FILETYPE_NONE; 19b4ed8f75SRussell King } 20b4ed8f75SRussell King 211da177e4SLinus Torvalds #define ADFS_NDA_OWNER_READ (1 << 0) 221da177e4SLinus Torvalds #define ADFS_NDA_OWNER_WRITE (1 << 1) 231da177e4SLinus Torvalds #define ADFS_NDA_LOCKED (1 << 2) 241da177e4SLinus Torvalds #define ADFS_NDA_DIRECTORY (1 << 3) 251da177e4SLinus Torvalds #define ADFS_NDA_EXECUTE (1 << 4) 261da177e4SLinus Torvalds #define ADFS_NDA_PUBLIC_READ (1 << 5) 271da177e4SLinus Torvalds #define ADFS_NDA_PUBLIC_WRITE (1 << 6) 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* 30608ba50bSAl Viro * adfs file system inode data in memory 31608ba50bSAl Viro */ 32608ba50bSAl Viro struct adfs_inode_info { 33608ba50bSAl Viro loff_t mmu_private; 345ed70bb4SRussell King __u32 parent_id; /* parent indirect disc address */ 3525e5d4dfSRussell King __u32 indaddr; /* object indirect disc address */ 36608ba50bSAl Viro __u32 loadaddr; /* RISC OS load address */ 37608ba50bSAl Viro __u32 execaddr; /* RISC OS exec address */ 38608ba50bSAl Viro unsigned int attr; /* RISC OS permissions */ 39608ba50bSAl Viro struct inode vfs_inode; 40608ba50bSAl Viro }; 41608ba50bSAl Viro 42b4ed8f75SRussell King static inline struct adfs_inode_info *ADFS_I(struct inode *inode) 43b4ed8f75SRussell King { 44b4ed8f75SRussell King return container_of(inode, struct adfs_inode_info, vfs_inode); 45b4ed8f75SRussell King } 46b4ed8f75SRussell King 47b4ed8f75SRussell King static inline bool adfs_inode_is_stamped(struct inode *inode) 48b4ed8f75SRussell King { 49b4ed8f75SRussell King return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000; 50b4ed8f75SRussell King } 51b4ed8f75SRussell King 52608ba50bSAl Viro /* 53608ba50bSAl Viro * Forward-declare this 54608ba50bSAl Viro */ 55608ba50bSAl Viro struct adfs_discmap; 56608ba50bSAl Viro struct adfs_dir_ops; 57608ba50bSAl Viro 58608ba50bSAl Viro /* 59608ba50bSAl Viro * ADFS file system superblock data in memory 60608ba50bSAl Viro */ 61608ba50bSAl Viro struct adfs_sb_info { 622d1d9b5bSAl Viro union { struct { 63608ba50bSAl Viro struct adfs_discmap *s_map; /* bh list containing map */ 640125f504SJulia Lawall const struct adfs_dir_ops *s_dir; /* directory operations */ 652d1d9b5bSAl Viro }; 662d1d9b5bSAl Viro struct rcu_head rcu; /* used only at shutdown time */ 672d1d9b5bSAl Viro }; 68c010d1ffSEric W. Biederman kuid_t s_uid; /* owner uid */ 69c010d1ffSEric W. Biederman kgid_t s_gid; /* owner gid */ 70608ba50bSAl Viro umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ 71608ba50bSAl Viro umode_t s_other_mask; /* ADFS other perm -> unix perm */ 72da23ef05SStuart Swales int s_ftsuffix; /* ,xyz hex filetype suffix option */ 73608ba50bSAl Viro 74608ba50bSAl Viro __u32 s_ids_per_zone; /* max. no ids in one zone */ 75608ba50bSAl Viro __u32 s_idlen; /* length of ID in map */ 76608ba50bSAl Viro __u32 s_map_size; /* sector size of a map */ 77608ba50bSAl Viro signed int s_map2blk; /* shift left by this for map->sector*/ 78608ba50bSAl Viro unsigned int s_log2sharesize;/* log2 share size */ 79608ba50bSAl Viro unsigned int s_namelen; /* maximum number of characters in name */ 80608ba50bSAl Viro }; 81608ba50bSAl Viro 82608ba50bSAl Viro static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) 83608ba50bSAl Viro { 84608ba50bSAl Viro return sb->s_fs_info; 85608ba50bSAl Viro } 86608ba50bSAl Viro 87608ba50bSAl Viro /* 881da177e4SLinus Torvalds * Directory handling 891da177e4SLinus Torvalds */ 901da177e4SLinus Torvalds struct adfs_dir { 911da177e4SLinus Torvalds struct super_block *sb; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds int nr_buffers; 941da177e4SLinus Torvalds struct buffer_head *bh[4]; 9571b26127SRussell King struct buffer_head **bhs; 962f09719aSStuart Swales 971da177e4SLinus Torvalds unsigned int pos; 985ed70bb4SRussell King __u32 parent_id; 991da177e4SLinus Torvalds 100016936b3SRussell King union { 101016936b3SRussell King struct adfs_dirheader *dirhead; 102016936b3SRussell King struct adfs_bigdirheader *bighead; 103016936b3SRussell King }; 104016936b3SRussell King union { 105016936b3SRussell King struct adfs_newdirtail *newtail; 106016936b3SRussell King struct adfs_bigdirtail *bigtail; 107016936b3SRussell King }; 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * This is the overall maximum name length 1121da177e4SLinus Torvalds */ 113da23ef05SStuart Swales #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ 1141da177e4SLinus Torvalds struct object_info { 1151da177e4SLinus Torvalds __u32 parent_id; /* parent object id */ 1165ed70bb4SRussell King __u32 indaddr; /* indirect disc addr */ 1171da177e4SLinus Torvalds __u32 loadaddr; /* load address */ 1181da177e4SLinus Torvalds __u32 execaddr; /* execution address */ 1191da177e4SLinus Torvalds __u32 size; /* size */ 1201da177e4SLinus Torvalds __u8 attr; /* RISC OS attributes */ 121da23ef05SStuart Swales unsigned int name_len; /* name length */ 1221da177e4SLinus Torvalds char name[ADFS_MAX_NAME_LEN];/* file name */ 1231da177e4SLinus Torvalds }; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds struct adfs_dir_ops { 1265ed70bb4SRussell King int (*read)(struct super_block *sb, unsigned int indaddr, 1275ed70bb4SRussell King unsigned int size, struct adfs_dir *dir); 1284287e4deSRussell King int (*iterate)(struct adfs_dir *dir, struct dir_context *ctx); 1291da177e4SLinus Torvalds int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 1301da177e4SLinus Torvalds int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 1311da177e4SLinus Torvalds int (*update)(struct adfs_dir *dir, struct object_info *obj); 1321da177e4SLinus Torvalds int (*create)(struct adfs_dir *dir, struct object_info *obj); 1331da177e4SLinus Torvalds int (*remove)(struct adfs_dir *dir, struct object_info *obj); 134aacc954cSRussell King int (*commit)(struct adfs_dir *dir); 1351da177e4SLinus Torvalds }; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds struct adfs_discmap { 1381da177e4SLinus Torvalds struct buffer_head *dm_bh; 1391da177e4SLinus Torvalds __u32 dm_startblk; 1401da177e4SLinus Torvalds unsigned int dm_startbit; 1411da177e4SLinus Torvalds unsigned int dm_endbit; 1421da177e4SLinus Torvalds }; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds /* Inode stuff */ 1451da177e4SLinus Torvalds struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 146a9185b41SChristoph Hellwig int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); 1471da177e4SLinus Torvalds int adfs_notify_change(struct dentry *dentry, struct iattr *attr); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* map.c */ 1505ed70bb4SRussell King int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset); 151e6160e46SRussell King void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf); 152f75d398dSRussell King struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr); 1537b195267SRussell King void adfs_free_map(struct super_block *sb); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* Misc */ 15619bdd41aSJoe Perches __printf(3, 4) 1571da177e4SLinus Torvalds void __adfs_error(struct super_block *sb, const char *function, 1581da177e4SLinus Torvalds const char *fmt, ...); 1598e24eea7SHarvey Harrison #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) 160ceb3b106SRussell King void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* super.c */ 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* 1651da177e4SLinus Torvalds * Inodes and file operations 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* dir_*.c */ 169754661f1SArjan van de Ven extern const struct inode_operations adfs_dir_inode_operations; 1704b6f5d20SArjan van de Ven extern const struct file_operations adfs_dir_operations; 171e16404edSAl Viro extern const struct dentry_operations adfs_dentry_operations; 1720125f504SJulia Lawall extern const struct adfs_dir_ops adfs_f_dir_ops; 1730125f504SJulia Lawall extern const struct adfs_dir_ops adfs_fplus_dir_ops; 1741da177e4SLinus Torvalds 175a317120bSRussell King int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset, 176a317120bSRussell King size_t len); 177a317120bSRussell King int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src, 178a317120bSRussell King size_t len); 1791dd9f5baSRussell King void adfs_dir_relse(struct adfs_dir *dir); 180419a6e5eSRussell King int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr, 181419a6e5eSRussell King unsigned int size, struct adfs_dir *dir); 182411c49bcSRussell King void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); 183ffdc9064SAl Viro extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, 184ffdc9064SAl Viro int wait); 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* file.c */ 187754661f1SArjan van de Ven extern const struct inode_operations adfs_file_inode_operations; 1884b6f5d20SArjan van de Ven extern const struct file_operations adfs_file_operations; 1891da177e4SLinus Torvalds 190e0c93142SAdrian Bunk static inline __u32 signed_asl(__u32 val, signed int shift) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds if (shift >= 0) 1931da177e4SLinus Torvalds val <<= shift; 1941da177e4SLinus Torvalds else 1951da177e4SLinus Torvalds val >>= -shift; 1961da177e4SLinus Torvalds return val; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds /* 2001da177e4SLinus Torvalds * Calculate the address of a block in an object given the block offset 2011da177e4SLinus Torvalds * and the object identity. 2021da177e4SLinus Torvalds * 2031da177e4SLinus Torvalds * The root directory ID should always be looked up in the map [3.4] 2041da177e4SLinus Torvalds */ 2055ed70bb4SRussell King static inline int __adfs_block_map(struct super_block *sb, u32 indaddr, 2061da177e4SLinus Torvalds unsigned int block) 2071da177e4SLinus Torvalds { 2085ed70bb4SRussell King if (indaddr & 255) { 2091da177e4SLinus Torvalds unsigned int off; 2101da177e4SLinus Torvalds 2115ed70bb4SRussell King off = (indaddr & 255) - 1; 2121da177e4SLinus Torvalds block += off << ADFS_SB(sb)->s_log2sharesize; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2155ed70bb4SRussell King return adfs_map_lookup(sb, indaddr >> 8, block); 2161da177e4SLinus Torvalds } 2171dfdfc94SRussell King 2181dfdfc94SRussell King /* Return the disc record from the map */ 2191dfdfc94SRussell King static inline 2201dfdfc94SRussell King struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm) 2211dfdfc94SRussell King { 2221dfdfc94SRussell King return (void *)(dm[0].dm_bh->b_data + 4); 2231dfdfc94SRussell King } 224275f5b99SRussell King 225275f5b99SRussell King static inline u64 adfs_disc_size(const struct adfs_discrecord *dr) 226275f5b99SRussell King { 227275f5b99SRussell King return (u64)le32_to_cpu(dr->disc_size_high) << 32 | 228275f5b99SRussell King le32_to_cpu(dr->disc_size); 229275f5b99SRussell King } 230