1 #include <linux/types.h>
3 #include <linux/buffer_head.h>
4 #include <linux/amigaffs.h>
5 #include <linux/mutex.h>
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).
13 /*#define AFFS_NO_TRUNCATE */
15 /* Ugly macros make the code more pretty. */
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)])
21 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
22 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
23 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
24 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
25 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
26 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
28 #define AFFS_CACHE_SIZE PAGE_SIZE
30 #define AFFS_MAX_PREALLOC 32
31 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
32 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
33 #define AFFS_AC_MASK (AFFS_AC_SIZE-1)
36 u32 ext
; /* idx of the extended block */
37 u32 key
; /* block number */
41 * affs fs inode data in memory
43 struct affs_inode_info
{
45 struct semaphore i_link_lock
; /* Protects internal inode access. */
46 struct semaphore i_ext_lock
; /* Protects internal inode access. */
47 #define i_hash_lock i_ext_lock
48 u32 i_blkcnt
; /* block count */
49 u32 i_extcnt
; /* extended block count */
50 u32
*i_lc
; /* linear cache of extended blocks */
54 struct affs_ext_key
*i_ac
; /* associative cache of extended blocks */
55 u32 i_ext_last
; /* last accessed extended block */
56 struct buffer_head
*i_ext_bh
; /* bh of last extended block */
58 u32 i_protect
; /* unused attribute bits */
59 u32 i_lastalloc
; /* last allocated block */
60 int i_pa_cnt
; /* number of preallocated blocks */
61 struct inode vfs_inode
;
64 /* short cut to get to the affs specific inode data */
65 static inline struct affs_inode_info
*AFFS_I(struct inode
*inode
)
67 return list_entry(inode
, struct affs_inode_info
, vfs_inode
);
71 * super-block data in memory
73 * Block numbers are adjusted for their actual size
78 u32 bm_key
; /* Disk block number */
79 u32 bm_free
; /* Free blocks in here */
83 int s_partition_size
; /* Partition size in blocks. */
84 int s_reserved
; /* Number of reserved blocks. */
85 //u32 s_blksize; /* Initial device blksize */
86 u32 s_data_blksize
; /* size of the data block w/o header */
87 u32 s_root_block
; /* FFS root block number. */
88 int s_hashsize
; /* Size of hash table. */
89 unsigned long s_flags
; /* See below. */
90 uid_t s_uid
; /* uid to override */
91 gid_t s_gid
; /* gid to override */
92 umode_t s_mode
; /* mode to override */
93 struct buffer_head
*s_root_bh
; /* Cached root block. */
94 struct mutex s_bmlock
; /* Protects bitmap access. */
95 struct affs_bm_info
*s_bitmap
; /* Bitmap infos. */
96 u32 s_bmap_count
; /* # of bitmap blocks. */
97 u32 s_bmap_bits
; /* # of bits in one bitmap blocks */
99 struct buffer_head
*s_bmap_bh
;
100 char *s_prefix
; /* Prefix for volumes and assigns. */
101 char s_volume
[32]; /* Volume prefix for absolute symlinks. */
102 spinlock_t symlink_lock
; /* protects the previous two */
105 #define SF_INTL 0x0001 /* International filesystem. */
106 #define SF_BM_VALID 0x0002 /* Bitmap is valid. */
107 #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
108 #define SF_QUIET 0x0008 /* chmod errors will be not reported */
109 #define SF_SETUID 0x0010 /* Ignore Amiga uid */
110 #define SF_SETGID 0x0020 /* Ignore Amiga gid */
111 #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
112 #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
113 #define SF_OFS 0x0200 /* Old filesystem */
114 #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
115 #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
117 /* short cut to get to the affs specific sb data */
118 static inline struct affs_sb_info
*AFFS_SB(struct super_block
*sb
)
120 return sb
->s_fs_info
;
125 extern int affs_insert_hash(struct inode
*inode
, struct buffer_head
*bh
);
126 extern int affs_remove_hash(struct inode
*dir
, struct buffer_head
*rem_bh
);
127 extern int affs_remove_header(struct dentry
*dentry
);
128 extern u32
affs_checksum_block(struct super_block
*sb
, struct buffer_head
*bh
);
129 extern void affs_fix_checksum(struct super_block
*sb
, struct buffer_head
*bh
);
130 extern void secs_to_datestamp(time_t secs
, struct affs_date
*ds
);
131 extern umode_t
prot_to_mode(u32 prot
);
132 extern void mode_to_prot(struct inode
*inode
);
133 extern void affs_error(struct super_block
*sb
, const char *function
, const char *fmt
, ...);
134 extern void affs_warning(struct super_block
*sb
, const char *function
, const char *fmt
, ...);
135 extern int affs_check_name(const unsigned char *name
, int len
);
136 extern int affs_copy_name(unsigned char *bstr
, struct dentry
*dentry
);
140 extern u32
affs_count_free_blocks(struct super_block
*s
);
141 extern void affs_free_block(struct super_block
*sb
, u32 block
);
142 extern u32
affs_alloc_block(struct inode
*inode
, u32 goal
);
143 extern int affs_init_bitmap(struct super_block
*sb
, int *flags
);
144 extern void affs_free_bitmap(struct super_block
*sb
);
148 extern int affs_hash_name(struct super_block
*sb
, const u8
*name
, unsigned int len
);
149 extern struct dentry
*affs_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*);
150 extern int affs_unlink(struct inode
*dir
, struct dentry
*dentry
);
151 extern int affs_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
, struct nameidata
*);
152 extern int affs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
);
153 extern int affs_rmdir(struct inode
*dir
, struct dentry
*dentry
);
154 extern int affs_link(struct dentry
*olddentry
, struct inode
*dir
,
155 struct dentry
*dentry
);
156 extern int affs_symlink(struct inode
*dir
, struct dentry
*dentry
,
157 const char *symname
);
158 extern int affs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
159 struct inode
*new_dir
, struct dentry
*new_dentry
);
163 extern unsigned long affs_parent_ino(struct inode
*dir
);
164 extern struct inode
*affs_new_inode(struct inode
*dir
);
165 extern int affs_notify_change(struct dentry
*dentry
, struct iattr
*attr
);
166 extern void affs_evict_inode(struct inode
*inode
);
167 extern struct inode
*affs_iget(struct super_block
*sb
,
169 extern int affs_write_inode(struct inode
*inode
,
170 struct writeback_control
*wbc
);
171 extern int affs_add_entry(struct inode
*dir
, struct inode
*inode
, struct dentry
*dentry
, s32 type
);
175 void affs_free_prealloc(struct inode
*inode
);
176 extern void affs_truncate(struct inode
*);
177 int affs_file_fsync(struct file
*, loff_t
, loff_t
, int);
181 extern void affs_dir_truncate(struct inode
*);
185 extern const struct inode_operations affs_file_inode_operations
;
186 extern const struct inode_operations affs_dir_inode_operations
;
187 extern const struct inode_operations affs_symlink_inode_operations
;
188 extern const struct file_operations affs_file_operations
;
189 extern const struct file_operations affs_file_operations_ofs
;
190 extern const struct file_operations affs_dir_operations
;
191 extern const struct address_space_operations affs_symlink_aops
;
192 extern const struct address_space_operations affs_aops
;
193 extern const struct address_space_operations affs_aops_ofs
;
195 extern const struct dentry_operations affs_dentry_operations
;
196 extern const struct dentry_operations affs_intl_dentry_operations
;
199 affs_set_blocksize(struct super_block
*sb
, int size
)
201 sb_set_blocksize(sb
, size
);
203 static inline struct buffer_head
*
204 affs_bread(struct super_block
*sb
, int block
)
206 pr_debug("affs_bread: %d\n", block
);
207 if (block
>= AFFS_SB(sb
)->s_reserved
&& block
< AFFS_SB(sb
)->s_partition_size
)
208 return sb_bread(sb
, block
);
211 static inline struct buffer_head
*
212 affs_getblk(struct super_block
*sb
, int block
)
214 pr_debug("affs_getblk: %d\n", block
);
215 if (block
>= AFFS_SB(sb
)->s_reserved
&& block
< AFFS_SB(sb
)->s_partition_size
)
216 return sb_getblk(sb
, block
);
219 static inline struct buffer_head
*
220 affs_getzeroblk(struct super_block
*sb
, int block
)
222 struct buffer_head
*bh
;
223 pr_debug("affs_getzeroblk: %d\n", block
);
224 if (block
>= AFFS_SB(sb
)->s_reserved
&& block
< AFFS_SB(sb
)->s_partition_size
) {
225 bh
= sb_getblk(sb
, block
);
227 memset(bh
->b_data
, 0 , sb
->s_blocksize
);
228 set_buffer_uptodate(bh
);
234 static inline struct buffer_head
*
235 affs_getemptyblk(struct super_block
*sb
, int block
)
237 struct buffer_head
*bh
;
238 pr_debug("affs_getemptyblk: %d\n", block
);
239 if (block
>= AFFS_SB(sb
)->s_reserved
&& block
< AFFS_SB(sb
)->s_partition_size
) {
240 bh
= sb_getblk(sb
, block
);
242 set_buffer_uptodate(bh
);
248 affs_brelse(struct buffer_head
*bh
)
251 pr_debug("affs_brelse: %lld\n", (long long) bh
->b_blocknr
);
256 affs_adjust_checksum(struct buffer_head
*bh
, u32 val
)
258 u32 tmp
= be32_to_cpu(((__be32
*)bh
->b_data
)[5]);
259 ((__be32
*)bh
->b_data
)[5] = cpu_to_be32(tmp
- val
);
262 affs_adjust_bitmapchecksum(struct buffer_head
*bh
, u32 val
)
264 u32 tmp
= be32_to_cpu(((__be32
*)bh
->b_data
)[0]);
265 ((__be32
*)bh
->b_data
)[0] = cpu_to_be32(tmp
- val
);
269 affs_lock_link(struct inode
*inode
)
271 down(&AFFS_I(inode
)->i_link_lock
);
274 affs_unlock_link(struct inode
*inode
)
276 up(&AFFS_I(inode
)->i_link_lock
);
279 affs_lock_dir(struct inode
*inode
)
281 down(&AFFS_I(inode
)->i_hash_lock
);
284 affs_unlock_dir(struct inode
*inode
)
286 up(&AFFS_I(inode
)->i_hash_lock
);
289 affs_lock_ext(struct inode
*inode
)
291 down(&AFFS_I(inode
)->i_ext_lock
);
294 affs_unlock_ext(struct inode
*inode
)
296 up(&AFFS_I(inode
)->i_ext_lock
);