blob: c770337c4b458beefc707a91fb8c9f7315d0634b [file] [log] [blame]
Al Viro608ba502009-06-16 14:52:13 -04001#include <linux/fs.h>
2#include <linux/adfs_fs.h>
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004/* Internal data structures for ADFS */
5
6#define ADFS_FREE_FRAG 0
7#define ADFS_BAD_FRAG 1
8#define ADFS_ROOT_FRAG 2
9
10#define ADFS_NDA_OWNER_READ (1 << 0)
11#define ADFS_NDA_OWNER_WRITE (1 << 1)
12#define ADFS_NDA_LOCKED (1 << 2)
13#define ADFS_NDA_DIRECTORY (1 << 3)
14#define ADFS_NDA_EXECUTE (1 << 4)
15#define ADFS_NDA_PUBLIC_READ (1 << 5)
16#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "dir_f.h"
19
20struct buffer_head;
21
22/*
Al Viro608ba502009-06-16 14:52:13 -040023 * adfs file system inode data in memory
24 */
25struct adfs_inode_info {
26 loff_t mmu_private;
27 unsigned long parent_id; /* object id of parent */
28 __u32 loadaddr; /* RISC OS load address */
29 __u32 execaddr; /* RISC OS exec address */
30 unsigned int filetype; /* RISC OS file type */
31 unsigned int attr; /* RISC OS permissions */
32 unsigned int stamped:1; /* RISC OS file has date/time */
33 struct inode vfs_inode;
34};
35
36/*
37 * Forward-declare this
38 */
39struct adfs_discmap;
40struct adfs_dir_ops;
41
42/*
43 * ADFS file system superblock data in memory
44 */
45struct adfs_sb_info {
Al Viro2d1d9b52013-10-03 12:37:18 -040046 union { struct {
47 struct adfs_discmap *s_map; /* bh list containing map */
48 struct adfs_dir_ops *s_dir; /* directory operations */
49 };
50 struct rcu_head rcu; /* used only at shutdown time */
51 };
Eric W. Biedermanc010d1f2012-02-07 15:58:38 -080052 kuid_t s_uid; /* owner uid */
53 kgid_t s_gid; /* owner gid */
Al Viro608ba502009-06-16 14:52:13 -040054 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
55 umode_t s_other_mask; /* ADFS other perm -> unix perm */
Stuart Swalesda23ef02011-03-22 16:35:06 -070056 int s_ftsuffix; /* ,xyz hex filetype suffix option */
Al Viro608ba502009-06-16 14:52:13 -040057
58 __u32 s_ids_per_zone; /* max. no ids in one zone */
59 __u32 s_idlen; /* length of ID in map */
60 __u32 s_map_size; /* sector size of a map */
61 unsigned long s_size; /* total size (in blocks) of this fs */
62 signed int s_map2blk; /* shift left by this for map->sector */
63 unsigned int s_log2sharesize;/* log2 share size */
64 __le32 s_version; /* disc format version */
65 unsigned int s_namelen; /* maximum number of characters in name */
66};
67
68static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
69{
70 return sb->s_fs_info;
71}
72
73static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
74{
75 return container_of(inode, struct adfs_inode_info, vfs_inode);
76}
77
78/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 * Directory handling
80 */
81struct adfs_dir {
82 struct super_block *sb;
83
84 int nr_buffers;
85 struct buffer_head *bh[4];
Stuart Swales2f097192011-03-22 16:35:04 -070086
87 /* big directories need allocated buffers */
88 struct buffer_head **bh_fplus;
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 unsigned int pos;
91 unsigned int parent_id;
92
93 struct adfs_dirheader dirhead;
94 union adfs_dirtail dirtail;
95};
96
97/*
98 * This is the overall maximum name length
99 */
Stuart Swalesda23ef02011-03-22 16:35:06 -0700100#define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101struct object_info {
102 __u32 parent_id; /* parent object id */
103 __u32 file_id; /* object id */
104 __u32 loadaddr; /* load address */
105 __u32 execaddr; /* execution address */
106 __u32 size; /* size */
107 __u8 attr; /* RISC OS attributes */
Stuart Swalesda23ef02011-03-22 16:35:06 -0700108 unsigned int name_len; /* name length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 char name[ADFS_MAX_NAME_LEN];/* file name */
Stuart Swalesda23ef02011-03-22 16:35:06 -0700110
111 /* RISC OS file type (12-bit: derived from loadaddr) */
112 __u16 filetype;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113};
114
Stuart Swalesda23ef02011-03-22 16:35:06 -0700115/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
116static inline int append_filetype_suffix(char *buf, __u16 filetype)
117{
Andrew Morton135a9fc2011-03-23 16:41:43 -0700118 if (filetype == 0xffff) /* no explicit 12-bit file type was set */
Stuart Swalesda23ef02011-03-22 16:35:06 -0700119 return 0;
120
121 *buf++ = ',';
122 *buf++ = hex_asc_lo(filetype >> 8);
123 *buf++ = hex_asc_lo(filetype >> 4);
124 *buf++ = hex_asc_lo(filetype >> 0);
125 return 4;
126}
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128struct adfs_dir_ops {
129 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
130 int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
131 int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
132 int (*update)(struct adfs_dir *dir, struct object_info *obj);
133 int (*create)(struct adfs_dir *dir, struct object_info *obj);
134 int (*remove)(struct adfs_dir *dir, struct object_info *obj);
Al Viroffdc9062009-06-08 00:44:42 -0400135 int (*sync)(struct adfs_dir *dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 void (*free)(struct adfs_dir *dir);
137};
138
139struct adfs_discmap {
140 struct buffer_head *dm_bh;
141 __u32 dm_startblk;
142 unsigned int dm_startbit;
143 unsigned int dm_endbit;
144};
145
146/* Inode stuff */
147struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100148int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
150
151/* map.c */
152extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
153extern unsigned int adfs_map_free(struct super_block *sb);
154
155/* Misc */
156void __adfs_error(struct super_block *sb, const char *function,
157 const char *fmt, ...);
Harvey Harrison8e24eea2008-04-30 00:55:09 -0700158#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160/* super.c */
161
162/*
163 * Inodes and file operations
164 */
165
166/* dir_*.c */
Arjan van de Ven754661f2007-02-12 00:55:38 -0800167extern const struct inode_operations adfs_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800168extern const struct file_operations adfs_dir_operations;
Al Viroe16404e2009-02-20 05:55:13 +0000169extern const struct dentry_operations adfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170extern struct adfs_dir_ops adfs_f_dir_ops;
171extern struct adfs_dir_ops adfs_fplus_dir_ops;
172
Al Viroffdc9062009-06-08 00:44:42 -0400173extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
174 int wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176/* file.c */
Arjan van de Ven754661f2007-02-12 00:55:38 -0800177extern const struct inode_operations adfs_file_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800178extern const struct file_operations adfs_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Adrian Bunke0c93142005-08-20 17:20:28 +0100180static inline __u32 signed_asl(__u32 val, signed int shift)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 if (shift >= 0)
183 val <<= shift;
184 else
185 val >>= -shift;
186 return val;
187}
188
189/*
190 * Calculate the address of a block in an object given the block offset
191 * and the object identity.
192 *
193 * The root directory ID should always be looked up in the map [3.4]
194 */
Adrian Bunke0c93142005-08-20 17:20:28 +0100195static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196__adfs_block_map(struct super_block *sb, unsigned int object_id,
197 unsigned int block)
198{
199 if (object_id & 255) {
200 unsigned int off;
201
202 off = (object_id & 255) - 1;
203 block += off << ADFS_SB(sb)->s_log2sharesize;
204 }
205
206 return adfs_map_lookup(sb, object_id >> 8, block);
207}