3 * \brief Exported VFS Definitions
4 * \author John Hodge (thePowersGang)
10 typedef Uint64 tInode;
12 //! Mountpoint identifier type
13 typedef Uint32 tMount;
16 //! Maximum length of a filename (including NULL byte)
17 #define FILENAME_MAX 256
18 //! Maximum size of a Memory Path generated by VFS_GetMemPath
19 #define VFS_MEMPATH_SIZE (3 + (BITS/4)*2)
21 * \name Flags for VFS_Open
24 //! Open for execution
25 #define VFS_OPENFLAG_EXEC 0x01
27 #define VFS_OPENFLAG_READ 0x02
29 #define VFS_OPENFLAG_WRITE 0x04
30 //! Do not resolve the final symbolic link
31 #define VFS_OPENFLAG_NOLINK 0x40
32 //! Create the file if it doesn't exist
33 #define VFS_OPENFLAG_CREATE 0x80
34 //! Treat as a directory
35 #define VFS_OPENFLAG_DIRECTORY 0x100
37 #define VFS_OPENFLAG_USER 0x8000
41 //! Marks a VFS handle as belonging to the kernel
42 #define VFS_KERNEL_FLAG 0x40000000
44 //! Architectual maximum number of file descriptors
45 #define MAX_FILE_DESCS 128
48 * \brief VFS_Seek directions
52 SEEK_SET = 1, //!< Set the current file offset
53 SEEK_CUR = 0, //!< Seek relative to the current position
54 SEEK_END = -1 //!< Seek from the end of the file backwards
58 * \name ACL Permissions
64 #define VFS_PERM_READ 0x00000001
68 #define VFS_PERM_WRITE 0x00000002
70 * \brief Append allowed
72 #define VFS_PERM_APPEND 0x00000004
76 #define VFS_PERM_EXECUTE 0x00000008
78 * \brief All permissions granted
80 #define VFS_PERM_ALL 0x7FFFFFFF // Mask for permissions
82 * \brief Denies instead of granting permissions
83 * \note Denials take precedence
85 #define VFS_PERM_DENY 0x80000000 // Inverts permissions
91 * \brief MMap protection flags
94 #define MMAP_PROT_READ 0x001 //!< Readable memory
95 #define MMAP_PROT_WRITE 0x002 //!< Writable memory
96 #define MMAP_PROT_EXEC 0x004 //!< Executable memory
102 * \brief MMap mapping flags
105 #define MMAP_MAP_SHARED 0x001 //!< Shared with all other users of the FD
106 #define MMAP_MAP_PRIVATE 0x002 //!< Local (COW) copy
107 #define MMAP_MAP_FIXED 0x004 //!< Load to a fixed address
108 #define MMAP_MAP_ANONYMOUS 0x008 //!< Not associated with a FD
113 // -- System Call Structures ---
115 * \brief ACL Defintion Structure
117 typedef struct sVFS_ACL
119 //! ACL entity selection
121 unsigned Group: 1; //!< Group (as opposed to user) flag
122 unsigned ID: 31; //!< ID of Group/User (-1 for nobody/world)
124 //! ACL Permissions mask
126 unsigned Inv: 1; //!< Invert Permissions
127 unsigned Perms: 31; //!< Permission Flags
132 * \brief SYS_FINFO structure
134 typedef struct sFInfo
136 tMount mount; //!< Mountpoint ID
137 tInode inode; //!< Inode
138 Uint32 uid; //!< Owning User ID
139 Uint32 gid; //!< Owning Group ID
140 Uint32 flags; //!< File flags
141 Uint64 size; //!< File Size
142 Sint64 atime; //!< Last Accessed time
143 Sint64 mtime; //!< Last modified time
144 Sint64 ctime; //!< Creation time
145 Sint32 numacls; //!< Total number of ACL entries
146 tVFS_ACL acls[]; //!< ACL buffer (size is passed in the \a MaxACLs argument to VFS_FInfo)
150 #include "../../../Usermode/Libraries/ld-acess.so_src/include_exp/acess/fd_set.h"
154 * \brief fd_set for select()
158 //! Bitmap of set file descriptors
159 Uint16 flags[MAX_FILE_DESCS/16];
163 * \brief Clear a descriptor flag in a fd_set
164 * \param fd File descriptor to clear
165 * \param fdsetp Set to modify
167 #define FD_CLR(fd, fdsetp) ((fdsetp)->flags[(fd)/16]&=~(1<<((fd)%16)))
169 * \brief Set a descriptor flag in a fd_set
170 * \param fd File descriptor to set
171 * \param fdsetp Set to modify
173 #define FD_SET(fd, fdsetp) ((fdsetp)->flags[(fd)/16]|=~(1<<((fd)%16)))
175 * \brief Test a descriptor flag in a fd_set
176 * \param fd File descriptor to test
177 * \param fdsetp Set to modify
179 #define FD_ISSET(fd, fdsetp) ((fdsetp)->flags[(fd)/16]&(1<<((fd)%16)))
184 * \brief Initialise the VFS (called by system.c)
185 * \return Boolean Success
187 extern int VFS_Init(void);
191 * \param Path Absolute or relative path to the file
192 * \param Flags Flags defining how to open the file
193 * \return VFS Handle (an integer) or -1 if an error occured
194 * \note Calls VFS_OpenEx(Path, Flags, 0)
196 extern int VFS_Open(const char *Path, Uint Flags);
199 * \param Path Absolute or relative path to the file
200 * \param Flags Flags defining how to open the file
201 * \param Mode Mode for newly created file (POSIX compatability)
202 * \return VFS Handle (an integer) or -1 if an error occured
204 extern int VFS_OpenEx(const char *Path, Uint Flags, Uint Mode);
206 * \brief Opens a file via an open directory
207 * \note The file to open must be a direct child of the parent
208 * \param FD Parent Directory
209 * \param Name Child name
210 * \param Mode Open mode
211 * \return File handle (same as returned from VFS_Open)
213 extern int VFS_OpenChild(int FD, const char *Name, Uint Mode);
215 * \brief Opens a file given a mount ID and an inode number
216 * \param Mount Mount ID returned by FInfo
217 * \param Inode Inode number from FInfo
218 * \param Mode Open mode (see VFS_Open)
219 * \return File handle (same as VFS_Open)
221 extern int VFS_OpenInode(Uint32 Mount, Uint64 Inode, int Mode);
224 * \brief Close a currently open file
225 * \param FD Handle returned by ::VFS_Open
227 extern void VFS_Close(int FD);
230 * \brief Get file information from an open file
231 * \param FD File handle returned by ::VFS_Open
232 * \param Dest Destination for the read information
233 * \param MaxACLs Number of ACL slots allocated in the \a Dest structure
234 * \return Boolean Success
236 * If the \a NumACLs is smaller than the number of ACLs the node has, only
237 * \a NumACLs will be copied into \a Dest, but the tFInfo.numacls field
238 * will be set to the true ammount of ACLs. It is up to the user to do with
239 * this information how they like.
241 extern int VFS_FInfo(int FD, tFInfo *Dest, int MaxACLs);
243 * \brief Gets the permissions appling to a user/group.
244 * \param FD File handle returned by ::VFS_Open
245 * \param Dest ACL information structure to edit
246 * \return Boolean success
248 * This function sets the tVFS_ACL.Inv and tVFS_ACL.Perms fields to what
249 * permissions the user/group specied in tVFS_ACL.ID has on the file.
251 extern int VFS_GetACL(int FD, tVFS_ACL *Dest);
253 * \brief Changes the user's current working directory
254 * \param Dest New working directory (either absolute or relative to the current)
255 * \return Boolean Success
257 extern int VFS_ChDir(const char *Dest);
259 * \brief Change the current virtual root for the user
260 * \param New New virtual root (same as ::VFS_ChDir but cannot go
261 * above the current virtual root)
262 * \return Boolean success
264 extern int VFS_ChRoot(const char *New);
267 * \brief Change the location of the current file pointer
268 * \param FD File handle returned by ::VFS_Open
269 * \param Offset Offset within the file to go to
270 * \param Whence A direction from ::eVFS_SeekDirs
271 * \return Boolean success
273 extern int VFS_Seek(int FD, Sint64 Offset, int Whence);
275 * \brief Returns the current file pointer
276 * \param FD File handle returned by ::VFS_Open
277 * \return Current file position
279 extern Uint64 VFS_Tell(int FD);
282 * \brief Reads data from a file
283 * \param FD File handle returned by ::VFS_Open
284 * \param Length Number of bytes to read from the file
285 * \param Buffer Destination of read data
286 * \return Number of read bytes
288 extern size_t VFS_Read(int FD, size_t Length, void *Buffer);
290 * \brief Writes data to a file
291 * \param FD File handle returned by ::VFS_Open
292 * \param Length Number of bytes to write to the file
293 * \param Buffer Source of written data
294 * \return Number of bytes written
296 extern size_t VFS_Write(int FD, size_t Length, const void *Buffer);
299 * \brief Reads from a specific offset in the file
300 * \param FD File handle returned by ::VFS_Open
301 * \param Offset Byte offset in the file
302 * \param Length Number of bytes to read from the file
303 * \param Buffer Source of read data
304 * \return Number of bytes read
306 extern size_t VFS_ReadAt(int FD, Uint64 Offset, size_t Length, void *Buffer);
308 * \brief Writes to a specific offset in the file
309 * \param FD File handle returned by ::VFS_Open
310 * \param Offset Byte offset in the file
311 * \param Length Number of bytes to write to the file
312 * \param Buffer Source of written data
313 * \return Number of bytes written
315 extern size_t VFS_WriteAt(int FD, Uint64 Offset, size_t Length, const void *Buffer);
318 * \brief Sends an IOCtl request to the driver
319 * \param FD File handle returned by ::VFS_Open
320 * \param ID IOCtl call ID (driver specific)
321 * \param Buffer Data pointer to send to the driver
322 * \return Driver specific response
324 extern int VFS_IOCtl(int FD, int ID, void *Buffer);
327 * \brief Creates a VFS Memory path from a pointer and size
328 * \param Dest Destination for the created path
329 * \param Base Base of the memory file
330 * \param Length Length of the memory buffer
331 * \note A maximum of VFS_MEMPATH_SIZE bytes will be required in \a Dest
333 extern void VFS_GetMemPath(char *Dest, void *Base, Uint Length);
335 * \brief Gets the canoical (true) path of a file
336 * \param Path File path (may contain symlinks, relative elements etc.)
337 * \return Absolute path with no symlinks
339 extern char *VFS_GetTruePath(const char *Path);
342 * \brief Mounts a filesystem
343 * \param Device Device to mount
344 * \param MountPoint Location to mount
345 * \param Filesystem Filesystem to use
346 * \param Options Options string to pass the driver
347 * \return 1 on succes, -1 on error
349 extern int VFS_Mount(const char *Device, const char *MountPoint, const char *Filesystem, const char *Options);
351 * \brief Unmount a mounted filesystem
352 * \param Mountpoint Location of the mount
353 * \return 0 on success, errno on error
355 extern int VFS_Unmount(const char *Mountpoint);
357 * \brief Attemt to unmount all fileystems
358 * \return Number of unmounted filesytems, -1 if none left to unmount
359 * \note Can return 0 when there are stil volumes mounted if there are open handles
361 extern int VFS_UnmountAll(void);
364 * \brief Create a new directory
365 * \param Path Path to new directory (absolute or relative)
366 * \return Boolean success
367 * \note The parent of the directory must exist
369 extern int VFS_MkDir(const char *Path);
371 * \brief Create a symbolic link
372 * \param Name Name of the symbolic link
373 * \param Link File the symlink points to
374 * \return Boolean success (\a Link is not tested for existence)
376 extern int VFS_Symlink(const char *Name, const char *Link);
378 * \brief Read from a directory
379 * \param FD File handle returned by ::VFS_Open
380 * \param Dest Destination array for the file name (max FILENAME_MAX bytes)
381 * \return Boolean Success
383 extern int VFS_ReadDir(int FD, char Dest[FILENAME_MAX]);
385 * \brief Wait for an aciton on a file descriptor
386 * \param MaxHandle Maximum set handle in \a *Handles
387 * \param ReadHandles Handles to wait for data on
388 * \param WriteHandles Handles to wait to write to
389 * \param ErrHandles Handle to wait for errors on
390 * \param Timeout Timeout for select() (if null, there is no timeout), if zero select() is non blocking
391 * \param ExtraEvents Extra event set to wait on
392 * \param IsKernel Use kernel handles as opposed to user handles
393 * \return Number of handles that actioned
395 extern int VFS_Select(int MaxHandle, fd_set *ReadHandles, fd_set *WriteHandles, fd_set *ErrHandles, tTime *Timeout, Uint32 ExtraEvents, BOOL IsKernel);
398 * \brief Map a file into memory
399 * \param DestHint Suggested place for read data
400 * \param Length Size of area to map
401 * \param Protection Protection type (see `man mmap`)
402 * \param Flags Mapping flags
403 * \param FD File descriptor to load from
404 * \param Offset Start of region
406 extern void *VFS_MMap(void *DestHint, size_t Length, int Protection, int Flags, int FD, Uint64 Offset);
409 * \brief Unmap memory allocated by VFS_MMap
410 * \param Addr Address of data to unmap
411 * \param Length Length of data
413 extern int VFS_MUnmap(void *Addr, size_t Length);