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 121da177e4SLinus Torvalds #define ADFS_NDA_OWNER_READ (1 << 0) 131da177e4SLinus Torvalds #define ADFS_NDA_OWNER_WRITE (1 << 1) 141da177e4SLinus Torvalds #define ADFS_NDA_LOCKED (1 << 2) 151da177e4SLinus Torvalds #define ADFS_NDA_DIRECTORY (1 << 3) 161da177e4SLinus Torvalds #define ADFS_NDA_EXECUTE (1 << 4) 171da177e4SLinus Torvalds #define ADFS_NDA_PUBLIC_READ (1 << 5) 181da177e4SLinus Torvalds #define ADFS_NDA_PUBLIC_WRITE (1 << 6) 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include "dir_f.h" 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds /* 23608ba50bSAl Viro * adfs file system inode data in memory 24608ba50bSAl Viro */ 25608ba50bSAl Viro struct adfs_inode_info { 26608ba50bSAl Viro loff_t mmu_private; 27608ba50bSAl Viro unsigned long parent_id; /* object id of parent */ 28608ba50bSAl Viro __u32 loadaddr; /* RISC OS load address */ 29608ba50bSAl Viro __u32 execaddr; /* RISC OS exec address */ 30608ba50bSAl Viro unsigned int filetype; /* RISC OS file type */ 31608ba50bSAl Viro unsigned int attr; /* RISC OS permissions */ 32608ba50bSAl Viro unsigned int stamped:1; /* RISC OS file has date/time */ 33608ba50bSAl Viro struct inode vfs_inode; 34608ba50bSAl Viro }; 35608ba50bSAl Viro 36608ba50bSAl Viro /* 37608ba50bSAl Viro * Forward-declare this 38608ba50bSAl Viro */ 39608ba50bSAl Viro struct adfs_discmap; 40608ba50bSAl Viro struct adfs_dir_ops; 41608ba50bSAl Viro 42608ba50bSAl Viro /* 43608ba50bSAl Viro * ADFS file system superblock data in memory 44608ba50bSAl Viro */ 45608ba50bSAl Viro struct adfs_sb_info { 462d1d9b5bSAl Viro union { struct { 47608ba50bSAl Viro struct adfs_discmap *s_map; /* bh list containing map */ 480125f504SJulia Lawall const struct adfs_dir_ops *s_dir; /* directory operations */ 492d1d9b5bSAl Viro }; 502d1d9b5bSAl Viro struct rcu_head rcu; /* used only at shutdown time */ 512d1d9b5bSAl Viro }; 52c010d1ffSEric W. Biederman kuid_t s_uid; /* owner uid */ 53c010d1ffSEric W. Biederman kgid_t s_gid; /* owner gid */ 54608ba50bSAl Viro umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ 55608ba50bSAl Viro umode_t s_other_mask; /* ADFS other perm -> unix perm */ 56da23ef05SStuart Swales int s_ftsuffix; /* ,xyz hex filetype suffix option */ 57608ba50bSAl Viro 58608ba50bSAl Viro __u32 s_ids_per_zone; /* max. no ids in one zone */ 59608ba50bSAl Viro __u32 s_idlen; /* length of ID in map */ 60608ba50bSAl Viro __u32 s_map_size; /* sector size of a map */ 61608ba50bSAl Viro signed int s_map2blk; /* shift left by this for map->sector*/ 62608ba50bSAl Viro unsigned int s_log2sharesize;/* log2 share size */ 63608ba50bSAl Viro __le32 s_version; /* disc format version */ 64608ba50bSAl Viro unsigned int s_namelen; /* maximum number of characters in name */ 65608ba50bSAl Viro }; 66608ba50bSAl Viro 67608ba50bSAl Viro static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) 68608ba50bSAl Viro { 69608ba50bSAl Viro return sb->s_fs_info; 70608ba50bSAl Viro } 71608ba50bSAl Viro 72608ba50bSAl Viro static inline struct adfs_inode_info *ADFS_I(struct inode *inode) 73608ba50bSAl Viro { 74608ba50bSAl Viro return container_of(inode, struct adfs_inode_info, vfs_inode); 75608ba50bSAl Viro } 76608ba50bSAl Viro 77608ba50bSAl Viro /* 781da177e4SLinus Torvalds * Directory handling 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds struct adfs_dir { 811da177e4SLinus Torvalds struct super_block *sb; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds int nr_buffers; 841da177e4SLinus Torvalds struct buffer_head *bh[4]; 852f09719aSStuart Swales 862f09719aSStuart Swales /* big directories need allocated buffers */ 872f09719aSStuart Swales struct buffer_head **bh_fplus; 882f09719aSStuart Swales 891da177e4SLinus Torvalds unsigned int pos; 901da177e4SLinus Torvalds unsigned int parent_id; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds struct adfs_dirheader dirhead; 931da177e4SLinus Torvalds union adfs_dirtail dirtail; 941da177e4SLinus Torvalds }; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* 971da177e4SLinus Torvalds * This is the overall maximum name length 981da177e4SLinus Torvalds */ 99da23ef05SStuart Swales #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ 1001da177e4SLinus Torvalds struct object_info { 1011da177e4SLinus Torvalds __u32 parent_id; /* parent object id */ 1021da177e4SLinus Torvalds __u32 file_id; /* object id */ 1031da177e4SLinus Torvalds __u32 loadaddr; /* load address */ 1041da177e4SLinus Torvalds __u32 execaddr; /* execution address */ 1051da177e4SLinus Torvalds __u32 size; /* size */ 1061da177e4SLinus Torvalds __u8 attr; /* RISC OS attributes */ 107da23ef05SStuart Swales unsigned int name_len; /* name length */ 1081da177e4SLinus Torvalds char name[ADFS_MAX_NAME_LEN];/* file name */ 109da23ef05SStuart Swales 110da23ef05SStuart Swales /* RISC OS file type (12-bit: derived from loadaddr) */ 111da23ef05SStuart Swales __u16 filetype; 1121da177e4SLinus Torvalds }; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds struct adfs_dir_ops { 1151da177e4SLinus Torvalds int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); 1161da177e4SLinus Torvalds int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 1171da177e4SLinus Torvalds int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 1181da177e4SLinus Torvalds int (*update)(struct adfs_dir *dir, struct object_info *obj); 1191da177e4SLinus Torvalds int (*create)(struct adfs_dir *dir, struct object_info *obj); 1201da177e4SLinus Torvalds int (*remove)(struct adfs_dir *dir, struct object_info *obj); 121ffdc9064SAl Viro int (*sync)(struct adfs_dir *dir); 1221da177e4SLinus Torvalds void (*free)(struct adfs_dir *dir); 1231da177e4SLinus Torvalds }; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds struct adfs_discmap { 1261da177e4SLinus Torvalds struct buffer_head *dm_bh; 1271da177e4SLinus Torvalds __u32 dm_startblk; 1281da177e4SLinus Torvalds unsigned int dm_startbit; 1291da177e4SLinus Torvalds unsigned int dm_endbit; 1301da177e4SLinus Torvalds }; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* Inode stuff */ 1331da177e4SLinus Torvalds struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 134a9185b41SChristoph Hellwig int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); 1351da177e4SLinus Torvalds int adfs_notify_change(struct dentry *dentry, struct iattr *attr); 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds /* map.c */ 1381da177e4SLinus Torvalds extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); 1391da177e4SLinus Torvalds extern unsigned int adfs_map_free(struct super_block *sb); 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds /* Misc */ 14219bdd41aSJoe Perches __printf(3, 4) 1431da177e4SLinus Torvalds void __adfs_error(struct super_block *sb, const char *function, 1441da177e4SLinus Torvalds const char *fmt, ...); 1458e24eea7SHarvey Harrison #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds /* super.c */ 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* 1501da177e4SLinus Torvalds * Inodes and file operations 1511da177e4SLinus Torvalds */ 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* dir_*.c */ 154754661f1SArjan van de Ven extern const struct inode_operations adfs_dir_inode_operations; 1554b6f5d20SArjan van de Ven extern const struct file_operations adfs_dir_operations; 156e16404edSAl Viro extern const struct dentry_operations adfs_dentry_operations; 1570125f504SJulia Lawall extern const struct adfs_dir_ops adfs_f_dir_ops; 1580125f504SJulia Lawall extern const struct adfs_dir_ops adfs_fplus_dir_ops; 1591da177e4SLinus Torvalds 160411c49bcSRussell King void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); 161ffdc9064SAl Viro extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, 162ffdc9064SAl Viro int wait); 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* file.c */ 165754661f1SArjan van de Ven extern const struct inode_operations adfs_file_inode_operations; 1664b6f5d20SArjan van de Ven extern const struct file_operations adfs_file_operations; 1671da177e4SLinus Torvalds 168e0c93142SAdrian Bunk static inline __u32 signed_asl(__u32 val, signed int shift) 1691da177e4SLinus Torvalds { 1701da177e4SLinus Torvalds if (shift >= 0) 1711da177e4SLinus Torvalds val <<= shift; 1721da177e4SLinus Torvalds else 1731da177e4SLinus Torvalds val >>= -shift; 1741da177e4SLinus Torvalds return val; 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 1781da177e4SLinus Torvalds * Calculate the address of a block in an object given the block offset 1791da177e4SLinus Torvalds * and the object identity. 1801da177e4SLinus Torvalds * 1811da177e4SLinus Torvalds * The root directory ID should always be looked up in the map [3.4] 1821da177e4SLinus Torvalds */ 183e0c93142SAdrian Bunk static inline int 1841da177e4SLinus Torvalds __adfs_block_map(struct super_block *sb, unsigned int object_id, 1851da177e4SLinus Torvalds unsigned int block) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds if (object_id & 255) { 1881da177e4SLinus Torvalds unsigned int off; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds off = (object_id & 255) - 1; 1911da177e4SLinus Torvalds block += off << ADFS_SB(sb)->s_log2sharesize; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds return adfs_map_lookup(sb, object_id >> 8, block); 1951da177e4SLinus Torvalds } 1961dfdfc94SRussell King 1971dfdfc94SRussell King /* Return the disc record from the map */ 1981dfdfc94SRussell King static inline 1991dfdfc94SRussell King struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm) 2001dfdfc94SRussell King { 2011dfdfc94SRussell King return (void *)(dm[0].dm_bh->b_data + 4); 2021dfdfc94SRussell King } 203275f5b99SRussell King 204275f5b99SRussell King static inline u64 adfs_disc_size(const struct adfs_discrecord *dr) 205275f5b99SRussell King { 206275f5b99SRussell King return (u64)le32_to_cpu(dr->disc_size_high) << 32 | 207275f5b99SRussell King le32_to_cpu(dr->disc_size); 208275f5b99SRussell King } 209