1 #include <linux/types.h>
3 #include <linux/buffer_head.h>
4 #include <linux/amigaffs.h>
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).
12 /*#define AFFS_NO_TRUNCATE */
14 /* Ugly macros make the code more pretty. */
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)])
20 #ifdef __LITTLE_ENDIAN
21 #define BO_EXBITS 0x18UL
22 #elif defined(__BIG_ENDIAN)
23 #define BO_EXBITS 0x00UL
25 #error Endianness must be known for affs to work.
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)
35 #define AFFS_CACHE_SIZE PAGE_SIZE
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)
43 u32 ext; /* idx of the extended block */
44 u32 key; /* block number */
48 * affs fs inode data in memory
50 struct affs_inode_info {
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 */
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 */
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;
71 /* short cut to get to the affs specific inode data */
72 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
74 return list_entry(inode, struct affs_inode_info, vfs_inode);
78 * super-block data in memory
80 * Block numbers are adjusted for their actual size
85 u32 bm_key; /* Disk block number */
86 u32 bm_free; /* Free blocks in here */
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 */
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. */
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 */
124 /* short cut to get to the affs specific sb data */
125 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
127 return sb->s_fs_info;
132 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
133 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
134 extern int affs_remove_header(struct dentry *dentry);
135 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
136 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
137 extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
138 extern mode_t prot_to_mode(u32 prot);
139 extern void mode_to_prot(struct inode *inode);
140 extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
141 extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
142 extern int affs_check_name(const unsigned char *name, int len);
143 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
147 extern u32 affs_count_free_blocks(struct super_block *s);
148 extern void affs_free_block(struct super_block *sb, u32 block);
149 extern u32 affs_alloc_block(struct inode *inode, u32 goal);
150 extern int affs_init_bitmap(struct super_block *sb, int *flags);
151 extern void affs_free_bitmap(struct super_block *sb);
155 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
156 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
157 extern int affs_unlink(struct inode *dir, struct dentry *dentry);
158 extern int affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
159 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
160 extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
161 extern int affs_link(struct dentry *olddentry, struct inode *dir,
162 struct dentry *dentry);
163 extern int affs_symlink(struct inode *dir, struct dentry *dentry,
164 const char *symname);
165 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
166 struct inode *new_dir, struct dentry *new_dentry);
170 extern unsigned long affs_parent_ino(struct inode *dir);
171 extern struct inode *affs_new_inode(struct inode *dir);
172 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
173 extern void affs_put_inode(struct inode *inode);
174 extern void affs_delete_inode(struct inode *inode);
175 extern void affs_clear_inode(struct inode *inode);
176 extern void affs_read_inode(struct inode *inode);
177 extern int affs_write_inode(struct inode *inode, int);
178 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
182 void affs_free_prealloc(struct inode *inode);
183 extern void affs_truncate(struct inode *);
187 extern void affs_dir_truncate(struct inode *);
191 extern struct inode_operations affs_file_inode_operations;
192 extern struct inode_operations affs_dir_inode_operations;
193 extern struct inode_operations affs_symlink_inode_operations;
194 extern const struct file_operations affs_file_operations;
195 extern const struct file_operations affs_file_operations_ofs;
196 extern const struct file_operations affs_dir_operations;
197 extern const struct address_space_operations affs_symlink_aops;
198 extern const struct address_space_operations affs_aops;
199 extern const struct address_space_operations affs_aops_ofs;
201 extern struct dentry_operations affs_dentry_operations;
202 extern struct dentry_operations affs_dentry_operations_intl;
205 affs_set_blocksize(struct super_block *sb, int size)
207 sb_set_blocksize(sb, size);
209 static inline struct buffer_head *
210 affs_bread(struct super_block *sb, int block)
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);
217 static inline struct buffer_head *
218 affs_getblk(struct super_block *sb, int block)
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);
225 static inline struct buffer_head *
226 affs_getzeroblk(struct super_block *sb, int block)
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);
233 memset(bh->b_data, 0 , sb->s_blocksize);
234 set_buffer_uptodate(bh);
240 static inline struct buffer_head *
241 affs_getemptyblk(struct super_block *sb, int block)
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);
248 set_buffer_uptodate(bh);
254 affs_brelse(struct buffer_head *bh)
257 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
262 affs_adjust_checksum(struct buffer_head *bh, u32 val)
264 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
265 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
268 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
270 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
271 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
275 affs_lock_link(struct inode *inode)
277 down(&AFFS_I(inode)->i_link_lock);
280 affs_unlock_link(struct inode *inode)
282 up(&AFFS_I(inode)->i_link_lock);
285 affs_lock_dir(struct inode *inode)
287 down(&AFFS_I(inode)->i_hash_lock);
290 affs_unlock_dir(struct inode *inode)
292 up(&AFFS_I(inode)->i_hash_lock);
295 affs_lock_ext(struct inode *inode)
297 down(&AFFS_I(inode)->i_ext_lock);
300 affs_unlock_ext(struct inode *inode)
302 up(&AFFS_I(inode)->i_ext_lock);