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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 | #ifndef _LINUX_DEVFS_FS_KERNEL_H
#define _LINUX_DEVFS_FS_KERNEL_H
#include <linux/fs.h>
#include <linux/config.h>
#include <linux/spinlock.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include <asm/semaphore.h>
#define DEVFS_SUPER_MAGIC 0x1373
#define IS_DEVFS_INODE(inode) (DEVFS_SUPER_MAGIC == (inode)->i_sb->s_magic)
#define DEVFS_MINOR(inode) \
({unsigned int m; /* evil GCC trickery */ \
((inode)->i_sb && \
((inode)->i_sb->s_magic==DEVFS_SUPER_MAGIC) && \
(devfs_get_maj_min(devfs_get_handle_from_inode((inode)),NULL,&m)==0) \
) ? m : MINOR((inode)->r_dev); })
#define DEVFS_FL_NONE 0x000 /* This helps to make code more readable
*/
#define DEVFS_FL_AUTO_OWNER 0x001 /* When a closed inode is opened the
ownerships are set to the opening
process and the protection is set to
that given in <<mode>>. When the inode
is closed, ownership reverts back to
<<uid>> and <<gid>> and the protection
is set to read-write for all */
#define DEVFS_FL_HIDE 0x002 /* Do not show entry in directory list */
#define DEVFS_FL_AUTO_DEVNUM 0x004 /* Automatically generate device number
*/
#define DEVFS_FL_AOPEN_NOTIFY 0x008 /* Asynchronously notify devfsd on open
*/
#define DEVFS_FL_REMOVABLE 0x010 /* This is a removable media device */
#define DEVFS_FL_WAIT 0x020 /* Wait for devfsd to finish */
#define DEVFS_FL_CURRENT_OWNER 0x040 /* Set initial ownership to current */
#define DEVFS_FL_DEFAULT DEVFS_FL_NONE
#define DEVFS_SPECIAL_CHR 0
#define DEVFS_SPECIAL_BLK 1
typedef struct devfs_entry * devfs_handle_t;
#ifdef CONFIG_DEVFS_FS
struct unique_numspace
{
spinlock_t init_lock;
unsigned char sem_initialised;
unsigned int num_free; /* Num free in bits */
unsigned int length; /* Array length in bytes */
__u32 *bits;
struct semaphore semaphore;
};
#define UNIQUE_NUMBERSPACE_INITIALISER {SPIN_LOCK_UNLOCKED, 0, 0, 0, NULL}
extern void devfs_put (devfs_handle_t de);
extern devfs_handle_t devfs_register (devfs_handle_t dir, const char *name,
unsigned int flags,
unsigned int major, unsigned int minor,
umode_t mode, void *ops, void *info);
extern void devfs_unregister (devfs_handle_t de);
extern int devfs_mk_symlink (devfs_handle_t dir, const char *name,
unsigned int flags, const char *link,
devfs_handle_t *handle, void *info);
extern devfs_handle_t devfs_mk_dir (devfs_handle_t dir, const char *name,
void *info);
extern devfs_handle_t devfs_get_handle (devfs_handle_t dir, const char *name,
unsigned int major,unsigned int minor,
char type, int traverse_symlinks);
extern devfs_handle_t devfs_find_handle (devfs_handle_t dir, const char *name,
unsigned int major,unsigned int minor,
char type, int traverse_symlinks);
extern int devfs_get_flags (devfs_handle_t de, unsigned int *flags);
extern int devfs_set_flags (devfs_handle_t de, unsigned int flags);
extern int devfs_get_maj_min (devfs_handle_t de,
unsigned int *major, unsigned int *minor);
extern devfs_handle_t devfs_get_handle_from_inode (struct inode *inode);
extern int devfs_generate_path (devfs_handle_t de, char *path, int buflen);
extern void *devfs_get_ops (devfs_handle_t de);
extern void devfs_put_ops (devfs_handle_t de);
extern int devfs_set_file_size (devfs_handle_t de, unsigned long size);
extern void *devfs_get_info (devfs_handle_t de);
extern int devfs_set_info (devfs_handle_t de, void *info);
extern devfs_handle_t devfs_get_parent (devfs_handle_t de);
extern devfs_handle_t devfs_get_first_child (devfs_handle_t de);
extern devfs_handle_t devfs_get_next_sibling (devfs_handle_t de);
extern void devfs_auto_unregister (devfs_handle_t master,devfs_handle_t slave);
extern devfs_handle_t devfs_get_unregister_slave (devfs_handle_t master);
extern const char *devfs_get_name (devfs_handle_t de, unsigned int *namelen);
extern int devfs_register_chrdev (unsigned int major, const char *name,
struct file_operations *fops);
extern int devfs_register_blkdev (unsigned int major, const char *name,
struct block_device_operations *bdops);
extern int devfs_unregister_chrdev (unsigned int major, const char *name);
extern int devfs_unregister_blkdev (unsigned int major, const char *name);
extern void devfs_register_tape (devfs_handle_t de);
extern void devfs_register_series (devfs_handle_t dir, const char *format,
unsigned int num_entries,
unsigned int flags, unsigned int major,
unsigned int minor_start,
umode_t mode, void *ops, void *info);
extern int devfs_alloc_major (char type);
extern void devfs_dealloc_major (char type, int major);
extern kdev_t devfs_alloc_devnum (char type);
extern void devfs_dealloc_devnum (char type, kdev_t devnum);
extern int devfs_alloc_unique_number (struct unique_numspace *space);
extern void devfs_dealloc_unique_number (struct unique_numspace *space,
int number);
extern void mount_devfs_fs (void);
#else /* CONFIG_DEVFS_FS */
struct unique_numspace
{
char dummy;
};
#define UNIQUE_NUMBERSPACE_INITIALISER {0}
static inline void devfs_put (devfs_handle_t de)
{
return;
}
static inline devfs_handle_t devfs_register (devfs_handle_t dir,
const char *name,
unsigned int flags,
unsigned int major,
unsigned int minor,
umode_t mode,
void *ops, void *info)
{
return NULL;
}
static inline void devfs_unregister (devfs_handle_t de)
{
return;
}
static inline int devfs_mk_symlink (devfs_handle_t dir, const char *name,
unsigned int flags, const char *link,
devfs_handle_t *handle, void *info)
{
return 0;
}
static inline devfs_handle_t devfs_mk_dir (devfs_handle_t dir,
const char *name, void *info)
{
return NULL;
}
static inline devfs_handle_t devfs_get_handle (devfs_handle_t dir,
const char *name,
unsigned int major,
unsigned int minor,
char type,
int traverse_symlinks)
{
return NULL;
}
static inline devfs_handle_t devfs_find_handle (devfs_handle_t dir,
const char *name,
unsigned int major,
unsigned int minor,
char type,
int traverse_symlinks)
{
return NULL;
}
static inline int devfs_get_flags (devfs_handle_t de, unsigned int *flags)
{
return 0;
}
static inline int devfs_set_flags (devfs_handle_t de, unsigned int flags)
{
return 0;
}
static inline int devfs_get_maj_min (devfs_handle_t de,
unsigned int *major, unsigned int *minor)
{
return 0;
}
static inline devfs_handle_t devfs_get_handle_from_inode (struct inode *inode)
{
return NULL;
}
static inline int devfs_generate_path (devfs_handle_t de, char *path,
int buflen)
{
return -ENOSYS;
}
static inline void *devfs_get_ops (devfs_handle_t de)
{
return NULL;
}
static inline void devfs_put_ops (devfs_handle_t de)
{
return;
}
static inline int devfs_set_file_size (devfs_handle_t de, unsigned long size)
{
return -ENOSYS;
}
static inline void *devfs_get_info (devfs_handle_t de)
{
return NULL;
}
static inline int devfs_set_info (devfs_handle_t de, void *info)
{
return 0;
}
static inline devfs_handle_t devfs_get_parent (devfs_handle_t de)
{
return NULL;
}
static inline devfs_handle_t devfs_get_first_child (devfs_handle_t de)
{
return NULL;
}
static inline devfs_handle_t devfs_get_next_sibling (devfs_handle_t de)
{
return NULL;
}
static inline void devfs_auto_unregister (devfs_handle_t master,
devfs_handle_t slave)
{
return;
}
static inline devfs_handle_t devfs_get_unregister_slave (devfs_handle_t master)
{
return NULL;
}
static inline const char *devfs_get_name (devfs_handle_t de,
unsigned int *namelen)
{
return NULL;
}
static inline int devfs_register_chrdev (unsigned int major, const char *name,
struct file_operations *fops)
{
return register_chrdev (major, name, fops);
}
static inline int devfs_register_blkdev (unsigned int major, const char *name,
struct block_device_operations *bdops)
{
return register_blkdev (major, name, bdops);
}
static inline int devfs_unregister_chrdev (unsigned int major,const char *name)
{
return unregister_chrdev (major, name);
}
static inline int devfs_unregister_blkdev (unsigned int major,const char *name)
{
return unregister_blkdev (major, name);
}
static inline void devfs_register_tape (devfs_handle_t de)
{
return;
}
static inline void devfs_register_series (devfs_handle_t dir,
const char *format,
unsigned int num_entries,
unsigned int flags,
unsigned int major,
unsigned int minor_start,
umode_t mode, void *ops, void *info)
{
return;
}
static inline int devfs_alloc_major (char type)
{
return -1;
}
static inline void devfs_dealloc_major (char type, int major)
{
return;
}
static inline kdev_t devfs_alloc_devnum (char type)
{
return NODEV;
}
static inline void devfs_dealloc_devnum (char type, kdev_t devnum)
{
return;
}
static inline int devfs_alloc_unique_number (struct unique_numspace *space)
{
return -1;
}
static inline void devfs_dealloc_unique_number (struct unique_numspace *space,
int number)
{
return;
}
static inline void mount_devfs_fs (void)
{
return;
}
#endif /* CONFIG_DEVFS_FS */
#endif /* _LINUX_DEVFS_FS_KERNEL_H */
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