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] */
adfs_filetype(u32 loadaddr)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
ADFS_I(struct inode * inode)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
adfs_inode_is_stamped(struct inode * inode)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
ADFS_SB(struct super_block * sb)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);
147*c1632a0fSChristian Brauner int adfs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
148549c7297SChristian Brauner struct iattr *attr);
1491da177e4SLinus Torvalds
1501da177e4SLinus Torvalds /* map.c */
1515ed70bb4SRussell King int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);
152e6160e46SRussell King void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf);
153f75d398dSRussell King struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr);
1547b195267SRussell King void adfs_free_map(struct super_block *sb);
1551da177e4SLinus Torvalds
1561da177e4SLinus Torvalds /* Misc */
15719bdd41aSJoe Perches __printf(3, 4)
1581da177e4SLinus Torvalds void __adfs_error(struct super_block *sb, const char *function,
1591da177e4SLinus Torvalds const char *fmt, ...);
1608e24eea7SHarvey Harrison #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
161ceb3b106SRussell King void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...);
1621da177e4SLinus Torvalds
1631da177e4SLinus Torvalds /* super.c */
1641da177e4SLinus Torvalds
1651da177e4SLinus Torvalds /*
1661da177e4SLinus Torvalds * Inodes and file operations
1671da177e4SLinus Torvalds */
1681da177e4SLinus Torvalds
1691da177e4SLinus Torvalds /* dir_*.c */
170754661f1SArjan van de Ven extern const struct inode_operations adfs_dir_inode_operations;
1714b6f5d20SArjan van de Ven extern const struct file_operations adfs_dir_operations;
172e16404edSAl Viro extern const struct dentry_operations adfs_dentry_operations;
1730125f504SJulia Lawall extern const struct adfs_dir_ops adfs_f_dir_ops;
1740125f504SJulia Lawall extern const struct adfs_dir_ops adfs_fplus_dir_ops;
1751da177e4SLinus Torvalds
176a317120bSRussell King int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset,
177a317120bSRussell King size_t len);
178a317120bSRussell King int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src,
179a317120bSRussell King size_t len);
1801dd9f5baSRussell King void adfs_dir_relse(struct adfs_dir *dir);
181419a6e5eSRussell King int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr,
182419a6e5eSRussell King unsigned int size, struct adfs_dir *dir);
183411c49bcSRussell King void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
184ffdc9064SAl Viro extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
185ffdc9064SAl Viro int wait);
1861da177e4SLinus Torvalds
1871da177e4SLinus Torvalds /* file.c */
188754661f1SArjan van de Ven extern const struct inode_operations adfs_file_inode_operations;
1894b6f5d20SArjan van de Ven extern const struct file_operations adfs_file_operations;
1901da177e4SLinus Torvalds
signed_asl(__u32 val,signed int shift)191e0c93142SAdrian Bunk static inline __u32 signed_asl(__u32 val, signed int shift)
1921da177e4SLinus Torvalds {
1931da177e4SLinus Torvalds if (shift >= 0)
1941da177e4SLinus Torvalds val <<= shift;
1951da177e4SLinus Torvalds else
1961da177e4SLinus Torvalds val >>= -shift;
1971da177e4SLinus Torvalds return val;
1981da177e4SLinus Torvalds }
1991da177e4SLinus Torvalds
2001da177e4SLinus Torvalds /*
2011da177e4SLinus Torvalds * Calculate the address of a block in an object given the block offset
2021da177e4SLinus Torvalds * and the object identity.
2031da177e4SLinus Torvalds *
2041da177e4SLinus Torvalds * The root directory ID should always be looked up in the map [3.4]
2051da177e4SLinus Torvalds */
__adfs_block_map(struct super_block * sb,u32 indaddr,unsigned int block)2065ed70bb4SRussell King static inline int __adfs_block_map(struct super_block *sb, u32 indaddr,
2071da177e4SLinus Torvalds unsigned int block)
2081da177e4SLinus Torvalds {
2095ed70bb4SRussell King if (indaddr & 255) {
2101da177e4SLinus Torvalds unsigned int off;
2111da177e4SLinus Torvalds
2125ed70bb4SRussell King off = (indaddr & 255) - 1;
2131da177e4SLinus Torvalds block += off << ADFS_SB(sb)->s_log2sharesize;
2141da177e4SLinus Torvalds }
2151da177e4SLinus Torvalds
2165ed70bb4SRussell King return adfs_map_lookup(sb, indaddr >> 8, block);
2171da177e4SLinus Torvalds }
2181dfdfc94SRussell King
2191dfdfc94SRussell King /* Return the disc record from the map */
2201dfdfc94SRussell King static inline
adfs_map_discrecord(struct adfs_discmap * dm)2211dfdfc94SRussell King struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm)
2221dfdfc94SRussell King {
2231dfdfc94SRussell King return (void *)(dm[0].dm_bh->b_data + 4);
2241dfdfc94SRussell King }
225275f5b99SRussell King
adfs_disc_size(const struct adfs_discrecord * dr)226275f5b99SRussell King static inline u64 adfs_disc_size(const struct adfs_discrecord *dr)
227275f5b99SRussell King {
228275f5b99SRussell King return (u64)le32_to_cpu(dr->disc_size_high) << 32 |
229275f5b99SRussell King le32_to_cpu(dr->disc_size);
230275f5b99SRussell King }
231