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gerrit-public.fairphone.software / kernel / msm / 350f19632d18e808aa1f2ca96f2be86c67de67ff / . / fs / affs / affs.h
blob: 0c6799f2137a742bf339d4b210651aa67394d37a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1#include <linux/types.h>
2#include <linux/fs.h>
3#include <linux/buffer_head.h>
4#include <linux/affs_fs.h>
5#include <linux/amigaffs.h>
6
7/* AmigaOS allows file names with up to 30 characters length.
8 * Names longer than that will be silently truncated. If you
9 * want to disallow this, comment out the following #define.
10 * Creating filesystem objects with longer names will then
11 * result in an error (ENAMETOOLONG).
12 */
13/*#define AFFS_NO_TRUNCATE */
14
15/* Ugly macros make the code more pretty. */
16
17#define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st))))
18#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
19#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
20
21#ifdef __LITTLE_ENDIAN
22#define BO_EXBITS 0x18UL
23#elif defined(__BIG_ENDIAN)
24#define BO_EXBITS 0x00UL
25#else
26#error Endianness must be known for affs to work.
27#endif
28
29#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
30#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
31#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
32#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
33#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
34#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
35
36#define AFFS_CACHE_SIZE PAGE_SIZE
37
38#define AFFS_MAX_PREALLOC 32
39#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
40#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
41#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
42
43struct affs_ext_key {
44 u32 ext; /* idx of the extended block */
45 u32 key; /* block number */
46};
47
48/*
49 * affs fs inode data in memory
50 */
51struct affs_inode_info {
52 u32 i_opencnt;
53 struct semaphore i_link_lock; /* Protects internal inode access. */
54 struct semaphore i_ext_lock; /* Protects internal inode access. */
55#define i_hash_lock i_ext_lock
56 u32 i_blkcnt; /* block count */
57 u32 i_extcnt; /* extended block count */
58 u32 *i_lc; /* linear cache of extended blocks */
59 u32 i_lc_size;
60 u32 i_lc_shift;
61 u32 i_lc_mask;
62 struct affs_ext_key *i_ac; /* associative cache of extended blocks */
63 u32 i_ext_last; /* last accessed extended block */
64 struct buffer_head *i_ext_bh; /* bh of last extended block */
65 loff_t mmu_private;
66 u32 i_protect; /* unused attribute bits */
67 u32 i_lastalloc; /* last allocated block */
68 int i_pa_cnt; /* number of preallocated blocks */
69 struct inode vfs_inode;
70};
71
72/* short cut to get to the affs specific inode data */
73static inline struct affs_inode_info *AFFS_I(struct inode *inode)
74{
75 return list_entry(inode, struct affs_inode_info, vfs_inode);
76}
77
78/*
79 * super-block data in memory
80 *
81 * Block numbers are adjusted for their actual size
82 *
83 */
84
85struct affs_bm_info {
86 u32 bm_key; /* Disk block number */
87 u32 bm_free; /* Free blocks in here */
88};
89
90struct affs_sb_info {
91 int s_partition_size; /* Partition size in blocks. */
92 int s_reserved; /* Number of reserved blocks. */
93 //u32 s_blksize; /* Initial device blksize */
94 u32 s_data_blksize; /* size of the data block w/o header */
95 u32 s_root_block; /* FFS root block number. */
96 int s_hashsize; /* Size of hash table. */
97 unsigned long s_flags; /* See below. */
98 uid_t s_uid; /* uid to override */
99 gid_t s_gid; /* gid to override */
100 umode_t s_mode; /* mode to override */
101 struct buffer_head *s_root_bh; /* Cached root block. */
102 struct semaphore s_bmlock; /* Protects bitmap access. */
103 struct affs_bm_info *s_bitmap; /* Bitmap infos. */
104 u32 s_bmap_count; /* # of bitmap blocks. */
105 u32 s_bmap_bits; /* # of bits in one bitmap blocks */
106 u32 s_last_bmap;
107 struct buffer_head *s_bmap_bh;
108 char *s_prefix; /* Prefix for volumes and assigns. */
109 int s_prefix_len; /* Length of prefix. */
110 char s_volume[32]; /* Volume prefix for absolute symlinks. */
111};
112
113#define SF_INTL 0x0001 /* International filesystem. */
114#define SF_BM_VALID 0x0002 /* Bitmap is valid. */
115#define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
116#define SF_QUIET 0x0008 /* chmod errors will be not reported */
117#define SF_SETUID 0x0010 /* Ignore Amiga uid */
118#define SF_SETGID 0x0020 /* Ignore Amiga gid */
119#define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
120#define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
121#define SF_OFS 0x0200 /* Old filesystem */
122#define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
123#define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
124
125/* short cut to get to the affs specific sb data */
126static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
127{
128 return sb->s_fs_info;
129}
130
131/* amigaffs.c */
132
133extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
134extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
135extern int affs_remove_header(struct dentry *dentry);
136extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
137extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
138extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
139extern mode_t prot_to_mode(u32 prot);
140extern void mode_to_prot(struct inode *inode);
141extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
142extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
143extern int affs_check_name(const unsigned char *name, int len);
144extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
145
146/* bitmap. c */
147
148extern u32 affs_count_free_blocks(struct super_block *s);
149extern void affs_free_block(struct super_block *sb, u32 block);
150extern u32 affs_alloc_block(struct inode *inode, u32 goal);
151extern int affs_init_bitmap(struct super_block *sb, int *flags);
152extern void affs_free_bitmap(struct super_block *sb);
153
154/* namei.c */
155
156extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
157extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
158extern int affs_unlink(struct inode *dir, struct dentry *dentry);
159extern int affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
160extern int affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
161extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
162extern int affs_link(struct dentry *olddentry, struct inode *dir,
163 struct dentry *dentry);
164extern int affs_symlink(struct inode *dir, struct dentry *dentry,
165 const char *symname);
166extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
167 struct inode *new_dir, struct dentry *new_dentry);
168
169/* inode.c */
170
171extern unsigned long affs_parent_ino(struct inode *dir);
172extern struct inode *affs_new_inode(struct inode *dir);
173extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
174extern void affs_put_inode(struct inode *inode);
175extern void affs_delete_inode(struct inode *inode);
176extern void affs_clear_inode(struct inode *inode);
177extern void affs_read_inode(struct inode *inode);
178extern int affs_write_inode(struct inode *inode, int);
179extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
180
181/* file.c */
182
183void affs_free_prealloc(struct inode *inode);
184extern void affs_truncate(struct inode *);
185
186/* dir.c */
187
188extern void affs_dir_truncate(struct inode *);
189
190/* jump tables */
191
192extern struct inode_operations affs_file_inode_operations;
193extern struct inode_operations affs_dir_inode_operations;
194extern struct inode_operations affs_symlink_inode_operations;
195extern struct file_operations affs_file_operations;
196extern struct file_operations affs_file_operations_ofs;
197extern struct file_operations affs_dir_operations;
198extern struct address_space_operations affs_symlink_aops;
199extern struct address_space_operations affs_aops;
200extern struct address_space_operations affs_aops_ofs;
201
202extern struct dentry_operations affs_dentry_operations;
203extern struct dentry_operations affs_dentry_operations_intl;
204
205static inline void
206affs_set_blocksize(struct super_block *sb, int size)
207{
208 sb_set_blocksize(sb, size);
209}
210static inline struct buffer_head *
211affs_bread(struct super_block *sb, int block)
212{
213 pr_debug("affs_bread: %d\n", block);
214 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
215 return sb_bread(sb, block);
216 return NULL;
217}
218static inline struct buffer_head *
219affs_getblk(struct super_block *sb, int block)
220{
221 pr_debug("affs_getblk: %d\n", block);
222 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
223 return sb_getblk(sb, block);
224 return NULL;
225}
226static inline struct buffer_head *
227affs_getzeroblk(struct super_block *sb, int block)
228{
229 struct buffer_head *bh;
230 pr_debug("affs_getzeroblk: %d\n", block);
231 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
232 bh = sb_getblk(sb, block);
233 lock_buffer(bh);
234 memset(bh->b_data, 0 , sb->s_blocksize);
235 set_buffer_uptodate(bh);
236 unlock_buffer(bh);
237 return bh;
238 }
239 return NULL;
240}
241static inline struct buffer_head *
242affs_getemptyblk(struct super_block *sb, int block)
243{
244 struct buffer_head *bh;
245 pr_debug("affs_getemptyblk: %d\n", block);
246 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
247 bh = sb_getblk(sb, block);
248 wait_on_buffer(bh);
249 set_buffer_uptodate(bh);
250 return bh;
251 }
252 return NULL;
253}
254static inline void
255affs_brelse(struct buffer_head *bh)
256{
257 if (bh)
258 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
259 brelse(bh);
260}
261
262static inline void
263affs_adjust_checksum(struct buffer_head *bh, u32 val)
264{
265 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
266 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
267}
268static inline void
269affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
270{
271 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
272 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
273}
274
275static inline void
276affs_lock_link(struct inode *inode)
277{
278 down(&AFFS_I(inode)->i_link_lock);
279}
280static inline void
281affs_unlock_link(struct inode *inode)
282{
283 up(&AFFS_I(inode)->i_link_lock);
284}
285static inline void
286affs_lock_dir(struct inode *inode)
287{
288 down(&AFFS_I(inode)->i_hash_lock);
289}
290static inline void
291affs_unlock_dir(struct inode *inode)
292{
293 up(&AFFS_I(inode)->i_hash_lock);
294}
295static inline void
296affs_lock_ext(struct inode *inode)
297{
298 down(&AFFS_I(inode)->i_ext_lock);
299}
300static inline void
301affs_unlock_ext(struct inode *inode)
302{
303 up(&AFFS_I(inode)->i_ext_lock);
304}