3 * (c) 2010 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
4 * Alexander Warg <warg@os.inf.tu-dresden.de>
5 * economic rights: Technische Universität Dresden (Germany)
7 * This file is part of TUD:OS and distributed under the terms of the
8 * GNU General Public License 2.
9 * Please see the COPYING-GPL-2 file for details.
11 * As a special exception, you may use this file as part of a free software
12 * library without restriction. Specifically, if other files instantiate
13 * templates or use macros or inline functions from this file, or you compile
14 * this file and link it with other files to produce an executable, this
15 * file does not by itself cause the resulting executable to be covered by
16 * the GNU General Public License. This exception does not however
17 * invalidate any other reasons why the executable file might be covered by
18 * the GNU General Public License.
22 #include <l4/l4re_vfs/vfs.h>
23 #include <l4/crtn/initpriorities.h>
25 namespace L4Re { namespace Vfs {
27 /// Reference to the applications L4Re::Vfs::Ops singleton.
28 extern L4Re::Vfs::Ops *vfs_ops asm ("l4re_env_posix_vfs_ops");
33 * \brief Boiler plate class for implementing an open file for L4Re::Vfs.
35 * This class may be used as a base class for everything that a POSIX
36 * file descriptor may point to. This are things such as regular files,
37 * directories, special device files, streams, pipes, and so on.
39 class Be_file : public File
42 // used in close, to unlock all locks of a file (as POSIX says)
43 int unlock_all_locks() throw()
47 L4::Cap<L4Re::Dataspace> data_space() const throw()
48 { return L4::Cap<L4Re::Dataspace>::Invalid; }
50 /// Default backend for POSIX read and readv functions.
51 ssize_t readv(const struct iovec*, int) throw()
54 /// Default backend for POSIX write and writev functions.
55 ssize_t writev(const struct iovec*, int) throw()
58 /// Default backend for POSIX pwrite and pwritev functions.
59 ssize_t pwritev(const struct iovec*, int, off64_t) throw()
62 /// Default backend for POSIX pread and preadv functions.
63 ssize_t preadv(const struct iovec*, int, off64_t) throw()
66 /// Default backend for POSIX seek and lseek functions.
67 off64_t lseek64(off64_t, int) throw()
70 /// Default backend for the POSIX truncate, ftruncate and similar functions.
71 int ftruncate64(off64_t) throw()
74 /// Default backend for POSIX fsync.
75 int fsync() const throw()
78 /// Default backend for POSIX fdatasync.
79 int fdatasync() const throw()
82 /// Default backend for POSIX ioctl.
83 int ioctl(unsigned long, va_list) throw()
86 int fstat64(struct stat64 *) const throw()
89 /// Default backend for POSIX chmod and fchmod.
90 int fchmod(mode_t) throw()
93 /// Default backend for POSIX fcntl subfunctions.
94 int get_status_flags() const throw()
97 /// Default backend for POSIX fcntl subfunctions.
98 int set_status_flags(long) throw()
101 /// Default backend for POSIX fcntl subfunctions.
102 int get_lock(struct flock64 *) throw()
105 /// Default backend for POSIX fcntl subfunctions.
106 int set_lock(struct flock64 *, bool) throw()
109 /// Default backend for POSIX access and faccessat functions.
110 int faccessat(const char *, int, int) throw()
113 /// Default backend for POSIX utime.
114 int utime(const struct utimbuf *) throw()
117 /// Default backend for POSIX utimes.
118 int utimes(const struct utimbuf [2]) throw()
121 /// Default backend for POSIX mkdir and mkdirat.
122 int mkdir(const char *, mode_t) throw()
125 /// Default backend for POSIX unlink, unlinkat.
126 int unlink(const char *) throw()
129 /// Default backend for POSIX rename, renameat.
130 int rename(const char *, const char *) throw()
133 /// Default backend for POSIX link, linkat.
134 int link(const char *, const char *) throw()
137 /// Default backend for POSIX symlink, symlinkat.
138 int symlink(const char *, const char *) throw()
141 /// Default backend for POSIX rmdir, rmdirat.
142 int rmdir(const char *) throw()
145 /// Default backend for POSIX readlink, readlinkat.
146 ssize_t readlink(char *, size_t)
149 ssize_t getdents(char *, size_t) throw()
152 ~Be_file() throw() = 0;
155 /// Default backend for POSIX openat, open.
156 int get_entry(const char *, int, mode_t, cxx::Ref_ptr<File> *) throw()
160 const char *get_mount(const char *path, cxx::Ref_ptr<File> *dir) throw();
164 Be_file::~Be_file() throw() {}
166 class Be_file_pos : public Be_file
169 Be_file_pos() throw() : Be_file(), _pos(0) {}
171 virtual off64_t size() const throw() = 0;
173 ssize_t readv(const struct iovec *v, int iovcnt) throw()
175 ssize_t r = preadv(v, iovcnt, _pos);
181 ssize_t writev(const struct iovec *v, int iovcnt) throw()
183 ssize_t r = pwritev(v, iovcnt, _pos);
189 ssize_t preadv(const struct iovec *v, int iovcnt, off64_t offset) throw() = 0;
190 ssize_t pwritev(const struct iovec *v, int iovcnt, off64_t offset) throw() = 0;
192 off64_t lseek64(off64_t offset, int whence) throw()
197 case SEEK_SET: r = offset; break;
198 case SEEK_CUR: r = _pos + offset; break;
199 case SEEK_END: r = size() + offset; break;
200 default: return -EINVAL;
211 off64_t pos() const throw() { return _pos; }
217 class Be_file_stream : public Be_file
220 ssize_t preadv(const struct iovec *v, int iovcnt, off64_t) throw()
221 { return readv(v, iovcnt); }
223 ssize_t pwritev(const struct iovec *v, int iovcnt, off64_t) throw()
224 { return writev(v, iovcnt); }
229 * \brief Boilerplate class for implementing a L4Re::Vfs::File_system.
231 * This class already takes care of registering and unregistering the
232 * file system in the global registry and implements the type() method.
234 class Be_file_system : public File_system
237 char const *const _fstype;
242 * \brief Create a file-system object for the given \a fstype.
243 * \param fstype The type that type() shall return.
245 * This constructor takes care of registering the file system
246 * in the registry of L4Re::Vfs::vfs_ops.
248 explicit Be_file_system(char const *fstype) throw()
249 : File_system(), _fstype(fstype)
251 vfs_ops->register_file_system(this);
255 * \brief Destroy a file-system object.
257 * This destructor takes care of removing this file system
258 * from the registry of L4Re::Vfs::vfs_ops.
260 ~Be_file_system() throw()
262 vfs_ops->unregister_file_system(this);
266 * \brief Return the file-system type.
268 * Returns the file-system type given as \a fstype in the constructor.
270 char const *type() const throw() { return _fstype; }
273 /* Make sure filesystems can register before the constructor of libmount
275 #define L4RE_VFS_FILE_SYSTEM_ATTRIBUTE \
276 __attribute__((init_priority(INIT_PRIO_LATE_VAL)))