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gerrit-public.fairphone.software / kernel / msm-4.9 / 6d1029b56329b1cc9b7233e5333c1a48ddbbfad8 / . / fs / affs / affs.h
blob: 223b1917093ea357ffe68440199cddd7abdd0489 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]4#include <linux/amigaffs.h>
5
6/* AmigaOS allows file names with up to 30 characters length.
7 * Names longer than that will be silently truncated. If you
8 * want to disallow this, comment out the following #define.
9 * Creating filesystem objects with longer names will then
10 * result in an error (ENAMETOOLONG).
11 */
12/*#define AFFS_NO_TRUNCATE */
13
14/* Ugly macros make the code more pretty. */
15
16#define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st))))
17#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
18#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
19
20#ifdef __LITTLE_ENDIAN
21#define BO_EXBITS 0x18UL
22#elif defined(__BIG_ENDIAN)
23#define BO_EXBITS 0x00UL
24#else
25#error Endianness must be known for affs to work.
26#endif
27
28#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
29#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
30#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
31#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
32#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
33#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
34
35#define AFFS_CACHE_SIZE PAGE_SIZE
36
37#define AFFS_MAX_PREALLOC 32
38#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
39#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
40#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
41
42struct affs_ext_key {
43 u32 ext; /* idx of the extended block */
44 u32 key; /* block number */
45};
46
47/*
48 * affs fs inode data in memory
49 */
50struct affs_inode_info {
Roman Zippeldca3c332008-04-29 17:02:20 +0200[diff] [blame]51 atomic_t i_opencnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]52 struct semaphore i_link_lock; /* Protects internal inode access. */
53 struct semaphore i_ext_lock; /* Protects internal inode access. */
54#define i_hash_lock i_ext_lock
55 u32 i_blkcnt; /* block count */
56 u32 i_extcnt; /* extended block count */
57 u32 *i_lc; /* linear cache of extended blocks */
58 u32 i_lc_size;
59 u32 i_lc_shift;
60 u32 i_lc_mask;
61 struct affs_ext_key *i_ac; /* associative cache of extended blocks */
62 u32 i_ext_last; /* last accessed extended block */
63 struct buffer_head *i_ext_bh; /* bh of last extended block */
64 loff_t mmu_private;
65 u32 i_protect; /* unused attribute bits */
66 u32 i_lastalloc; /* last allocated block */
67 int i_pa_cnt; /* number of preallocated blocks */
68 struct inode vfs_inode;
69};
70
71/* short cut to get to the affs specific inode data */
72static inline struct affs_inode_info *AFFS_I(struct inode *inode)
73{
74 return list_entry(inode, struct affs_inode_info, vfs_inode);
75}
76
77/*
78 * super-block data in memory
79 *
80 * Block numbers are adjusted for their actual size
81 *
82 */
83
84struct affs_bm_info {
85 u32 bm_key; /* Disk block number */
86 u32 bm_free; /* Free blocks in here */
87};
88
89struct affs_sb_info {
90 int s_partition_size; /* Partition size in blocks. */
91 int s_reserved; /* Number of reserved blocks. */
92 //u32 s_blksize; /* Initial device blksize */
93 u32 s_data_blksize; /* size of the data block w/o header */
94 u32 s_root_block; /* FFS root block number. */
95 int s_hashsize; /* Size of hash table. */
96 unsigned long s_flags; /* See below. */
97 uid_t s_uid; /* uid to override */
98 gid_t s_gid; /* gid to override */
99 umode_t s_mode; /* mode to override */
100 struct buffer_head *s_root_bh; /* Cached root block. */
101 struct semaphore s_bmlock; /* Protects bitmap access. */
102 struct affs_bm_info *s_bitmap; /* Bitmap infos. */
103 u32 s_bmap_count; /* # of bitmap blocks. */
104 u32 s_bmap_bits; /* # of bits in one bitmap blocks */
105 u32 s_last_bmap;
106 struct buffer_head *s_bmap_bh;
107 char *s_prefix; /* Prefix for volumes and assigns. */
108 int s_prefix_len; /* Length of prefix. */
109 char s_volume[32]; /* Volume prefix for absolute symlinks. */
110};
111
112#define SF_INTL 0x0001 /* International filesystem. */
113#define SF_BM_VALID 0x0002 /* Bitmap is valid. */
114#define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
115#define SF_QUIET 0x0008 /* chmod errors will be not reported */
116#define SF_SETUID 0x0010 /* Ignore Amiga uid */
117#define SF_SETGID 0x0020 /* Ignore Amiga gid */
118#define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
119#define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
120#define SF_OFS 0x0200 /* Old filesystem */
121#define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
122#define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
123
124/* short cut to get to the affs specific sb data */
125static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
126{
127 return sb->s_fs_info;
128}
129
130/* amigaffs.c */
131
132extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
133extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
134extern int affs_remove_header(struct dentry *dentry);
135extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
136extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
137extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
138extern mode_t prot_to_mode(u32 prot);
139extern void mode_to_prot(struct inode *inode);
140extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
141extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
142extern int affs_check_name(const unsigned char *name, int len);
143extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
144
145/* bitmap. c */
146
147extern u32 affs_count_free_blocks(struct super_block *s);
148extern void affs_free_block(struct super_block *sb, u32 block);
149extern u32 affs_alloc_block(struct inode *inode, u32 goal);
150extern int affs_init_bitmap(struct super_block *sb, int *flags);
151extern void affs_free_bitmap(struct super_block *sb);
152
153/* namei.c */
154
155extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
156extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
157extern int affs_unlink(struct inode *dir, struct dentry *dentry);
158extern int affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
159extern int affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
160extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
161extern int affs_link(struct dentry *olddentry, struct inode *dir,
162 struct dentry *dentry);
163extern int affs_symlink(struct inode *dir, struct dentry *dentry,
164 const char *symname);
165extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
166 struct inode *new_dir, struct dentry *new_dentry);
167
168/* inode.c */
169
170extern unsigned long affs_parent_ino(struct inode *dir);
171extern struct inode *affs_new_inode(struct inode *dir);
172extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]173extern void affs_delete_inode(struct inode *inode);
174extern void affs_clear_inode(struct inode *inode);
David Howells210f8552008-02-07 00:15:29 -0800[diff] [blame]175extern struct inode *affs_iget(struct super_block *sb,
176 unsigned long ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]177extern int affs_write_inode(struct inode *inode, int);
178extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
179
180/* file.c */
181
182void affs_free_prealloc(struct inode *inode);
183extern void affs_truncate(struct inode *);
184
185/* dir.c */
186
187extern void affs_dir_truncate(struct inode *);
188
189/* jump tables */
190
Arjan van de Ven754661f2007-02-12 00:55:38 -0800[diff] [blame]191extern const struct inode_operations affs_file_inode_operations;
192extern const struct inode_operations affs_dir_inode_operations;
193extern const struct inode_operations affs_symlink_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800[diff] [blame]194extern const struct file_operations affs_file_operations;
195extern const struct file_operations affs_file_operations_ofs;
196extern const struct file_operations affs_dir_operations;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700[diff] [blame]197extern const struct address_space_operations affs_symlink_aops;
198extern const struct address_space_operations affs_aops;
199extern const struct address_space_operations affs_aops_ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]200
201extern struct dentry_operations affs_dentry_operations;
202extern struct dentry_operations affs_dentry_operations_intl;
203
204static inline void
205affs_set_blocksize(struct super_block *sb, int size)
206{
207 sb_set_blocksize(sb, size);
208}
209static inline struct buffer_head *
210affs_bread(struct super_block *sb, int block)
211{
212 pr_debug("affs_bread: %d\n", block);
213 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
214 return sb_bread(sb, block);
215 return NULL;
216}
217static inline struct buffer_head *
218affs_getblk(struct super_block *sb, int block)
219{
220 pr_debug("affs_getblk: %d\n", block);
221 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
222 return sb_getblk(sb, block);
223 return NULL;
224}
225static inline struct buffer_head *
226affs_getzeroblk(struct super_block *sb, int block)
227{
228 struct buffer_head *bh;
229 pr_debug("affs_getzeroblk: %d\n", block);
230 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
231 bh = sb_getblk(sb, block);
232 lock_buffer(bh);
233 memset(bh->b_data, 0 , sb->s_blocksize);
234 set_buffer_uptodate(bh);
235 unlock_buffer(bh);
236 return bh;
237 }
238 return NULL;
239}
240static inline struct buffer_head *
241affs_getemptyblk(struct super_block *sb, int block)
242{
243 struct buffer_head *bh;
244 pr_debug("affs_getemptyblk: %d\n", block);
245 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
246 bh = sb_getblk(sb, block);
247 wait_on_buffer(bh);
248 set_buffer_uptodate(bh);
249 return bh;
250 }
251 return NULL;
252}
253static inline void
254affs_brelse(struct buffer_head *bh)
255{
256 if (bh)
257 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
258 brelse(bh);
259}
260
261static inline void
262affs_adjust_checksum(struct buffer_head *bh, u32 val)
263{
264 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
265 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
266}
267static inline void
268affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
269{
270 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
271 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
272}
273
274static inline void
275affs_lock_link(struct inode *inode)
276{
277 down(&AFFS_I(inode)->i_link_lock);
278}
279static inline void
280affs_unlock_link(struct inode *inode)
281{
282 up(&AFFS_I(inode)->i_link_lock);
283}
284static inline void
285affs_lock_dir(struct inode *inode)
286{
287 down(&AFFS_I(inode)->i_hash_lock);
288}
289static inline void
290affs_unlock_dir(struct inode *inode)
291{
292 up(&AFFS_I(inode)->i_hash_lock);
293}
294static inline void
295affs_lock_ext(struct inode *inode)
296{
297 down(&AFFS_I(inode)->i_ext_lock);
298}
299static inline void
300affs_unlock_ext(struct inode *inode)
301{
302 up(&AFFS_I(inode)->i_ext_lock);
303}