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 */
103 struct super_block *sb; /* the VFS superblock object */
106 #define SF_INTL 0x0001 /* International filesystem. */
107 #define SF_BM_VALID 0x0002 /* Bitmap is valid. */
108 #define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
109 #define SF_QUIET 0x0008 /* chmod errors will be not reported */
110 #define SF_SETUID 0x0010 /* Ignore Amiga uid */
111 #define SF_SETGID 0x0020 /* Ignore Amiga gid */
112 #define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
113 #define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
114 #define SF_OFS 0x0200 /* Old filesystem */
115 #define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
116 #define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
118 /* short cut to get to the affs specific sb data */
119 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
121 return sb->s_fs_info;
126 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
127 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
128 extern int affs_remove_header(struct dentry *dentry);
129 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
130 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
131 extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
132 extern umode_t prot_to_mode(u32 prot);
133 extern void mode_to_prot(struct inode *inode);
134 extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
135 extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
136 extern int affs_check_name(const unsigned char *name, int len);
137 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
141 extern u32 affs_count_free_blocks(struct super_block *s);
142 extern void affs_free_block(struct super_block *sb, u32 block);
143 extern u32 affs_alloc_block(struct inode *inode, u32 goal);
144 extern int affs_init_bitmap(struct super_block *sb, int *flags);
145 extern void affs_free_bitmap(struct super_block *sb);
149 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
150 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
151 extern int affs_unlink(struct inode *dir, struct dentry *dentry);
152 extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *);
153 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
154 extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
155 extern int affs_link(struct dentry *olddentry, struct inode *dir,
156 struct dentry *dentry);
157 extern int affs_symlink(struct inode *dir, struct dentry *dentry,
158 const char *symname);
159 extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
160 struct inode *new_dir, struct dentry *new_dentry);
164 extern unsigned long affs_parent_ino(struct inode *dir);
165 extern struct inode *affs_new_inode(struct inode *dir);
166 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
167 extern void affs_evict_inode(struct inode *inode);
168 extern struct inode *affs_iget(struct super_block *sb,
170 extern int affs_write_inode(struct inode *inode,
171 struct writeback_control *wbc);
172 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
176 void affs_free_prealloc(struct inode *inode);
177 extern void affs_truncate(struct inode *);
178 int affs_file_fsync(struct file *, loff_t, loff_t, int);
182 extern void affs_dir_truncate(struct inode *);
186 extern const struct inode_operations affs_file_inode_operations;
187 extern const struct inode_operations affs_dir_inode_operations;
188 extern const struct inode_operations affs_symlink_inode_operations;
189 extern const struct file_operations affs_file_operations;
190 extern const struct file_operations affs_file_operations_ofs;
191 extern const struct file_operations affs_dir_operations;
192 extern const struct address_space_operations affs_symlink_aops;
193 extern const struct address_space_operations affs_aops;
194 extern const struct address_space_operations affs_aops_ofs;
196 extern const struct dentry_operations affs_dentry_operations;
197 extern const struct dentry_operations affs_intl_dentry_operations;
200 affs_set_blocksize(struct super_block *sb, int size)
202 sb_set_blocksize(sb, size);
204 static inline struct buffer_head *
205 affs_bread(struct super_block *sb, int block)
207 pr_debug("affs_bread: %d\n", block);
208 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
209 return sb_bread(sb, block);
212 static inline struct buffer_head *
213 affs_getblk(struct super_block *sb, int block)
215 pr_debug("affs_getblk: %d\n", block);
216 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
217 return sb_getblk(sb, block);
220 static inline struct buffer_head *
221 affs_getzeroblk(struct super_block *sb, int block)
223 struct buffer_head *bh;
224 pr_debug("affs_getzeroblk: %d\n", block);
225 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
226 bh = sb_getblk(sb, block);
228 memset(bh->b_data, 0 , sb->s_blocksize);
229 set_buffer_uptodate(bh);
235 static inline struct buffer_head *
236 affs_getemptyblk(struct super_block *sb, int block)
238 struct buffer_head *bh;
239 pr_debug("affs_getemptyblk: %d\n", block);
240 if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
241 bh = sb_getblk(sb, block);
243 set_buffer_uptodate(bh);
249 affs_brelse(struct buffer_head *bh)
252 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
257 affs_adjust_checksum(struct buffer_head *bh, u32 val)
259 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
260 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
263 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
265 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
266 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
270 affs_lock_link(struct inode *inode)
272 down(&AFFS_I(inode)->i_link_lock);
275 affs_unlock_link(struct inode *inode)
277 up(&AFFS_I(inode)->i_link_lock);
280 affs_lock_dir(struct inode *inode)
282 down(&AFFS_I(inode)->i_hash_lock);
285 affs_unlock_dir(struct inode *inode)
287 up(&AFFS_I(inode)->i_hash_lock);
290 affs_lock_ext(struct inode *inode)
292 down(&AFFS_I(inode)->i_ext_lock);
295 affs_unlock_ext(struct inode *inode)
297 up(&AFFS_I(inode)->i_ext_lock);