ardupilot/libraries/AP_Filesystem/AP_Filesystem.cpp

238 lines
5.8 KiB
C++

/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "AP_Filesystem.h"
static AP_Filesystem fs;
#if CONFIG_HAL_BOARD == HAL_BOARD_CHIBIOS
#if HAVE_FILESYSTEM_SUPPORT
#include "AP_Filesystem_FATFS.h"
static AP_Filesystem_FATFS fs_local;
#else
static AP_Filesystem_Backend fs_local;
int errno;
#endif // HAVE_FILESYSTEM_SUPPORT
#endif // HAL_BOARD_CHIBIOS
#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX || CONFIG_HAL_BOARD == HAL_BOARD_SITL
#include "AP_Filesystem_posix.h"
static AP_Filesystem_Posix fs_local;
#endif
#ifdef HAL_HAVE_AP_ROMFS_EMBEDDED_H
#include "AP_Filesystem_ROMFS.h"
static AP_Filesystem_ROMFS fs_romfs;
#endif
#include "AP_Filesystem_Param.h"
static AP_Filesystem_Param fs_param;
#include "AP_Filesystem_Sys.h"
static AP_Filesystem_Sys fs_sys;
/*
mapping from filesystem prefix to backend
*/
const AP_Filesystem::Backend AP_Filesystem::backends[] = {
{ nullptr, fs_local },
#ifdef HAL_HAVE_AP_ROMFS_EMBEDDED_H
{ "@ROMFS/", fs_romfs },
#endif
{ "@PARAM/", fs_param },
{ "@SYS/", fs_sys },
};
#define MAX_FD_PER_BACKEND 256U
#define NUM_BACKENDS ARRAY_SIZE(backends)
#define LOCAL_BACKEND backends[0]
#define BACKEND_IDX(backend) (&(backend) - &backends[0])
/*
find backend by path
*/
const AP_Filesystem::Backend &AP_Filesystem::backend_by_path(const char *&path) const
{
for (uint8_t i=1; i<NUM_BACKENDS; i++) {
const uint8_t plen = strlen(backends[i].prefix);
if (strncmp(path, backends[i].prefix, plen) == 0) {
path += plen;
return backends[i];
}
}
// default to local filesystem
return LOCAL_BACKEND;
}
/*
return backend by file descriptor
*/
const AP_Filesystem::Backend &AP_Filesystem::backend_by_fd(int &fd) const
{
if (fd < 0 || uint32_t(fd) >= NUM_BACKENDS*MAX_FD_PER_BACKEND) {
return LOCAL_BACKEND;
}
const uint8_t idx = uint32_t(fd) / MAX_FD_PER_BACKEND;
fd -= idx * MAX_FD_PER_BACKEND;
return backends[idx];
}
int AP_Filesystem::open(const char *fname, int flags)
{
const Backend &backend = backend_by_path(fname);
int fd = backend.fs.open(fname, flags);
if (fd < 0) {
return -1;
}
if (uint32_t(fd) >= MAX_FD_PER_BACKEND) {
backend.fs.close(fd);
errno = ERANGE;
return -1;
}
// offset fd so we can recognise the backend
const uint8_t idx = (&backend - &backends[0]);
fd += idx * MAX_FD_PER_BACKEND;
return fd;
}
int AP_Filesystem::close(int fd)
{
const Backend &backend = backend_by_fd(fd);
return backend.fs.close(fd);
}
int32_t AP_Filesystem::read(int fd, void *buf, uint32_t count)
{
const Backend &backend = backend_by_fd(fd);
return backend.fs.read(fd, buf, count);
}
int32_t AP_Filesystem::write(int fd, const void *buf, uint32_t count)
{
const Backend &backend = backend_by_fd(fd);
return backend.fs.write(fd, buf, count);
}
int AP_Filesystem::fsync(int fd)
{
const Backend &backend = backend_by_fd(fd);
return backend.fs.fsync(fd);
}
int32_t AP_Filesystem::lseek(int fd, int32_t offset, int seek_from)
{
const Backend &backend = backend_by_fd(fd);
return backend.fs.lseek(fd, offset, seek_from);
}
int AP_Filesystem::stat(const char *pathname, struct stat *stbuf)
{
const Backend &backend = backend_by_path(pathname);
return backend.fs.stat(pathname, stbuf);
}
int AP_Filesystem::unlink(const char *pathname)
{
const Backend &backend = backend_by_path(pathname);
return backend.fs.unlink(pathname);
}
int AP_Filesystem::mkdir(const char *pathname)
{
const Backend &backend = backend_by_path(pathname);
return backend.fs.mkdir(pathname);
}
AP_Filesystem::DirHandle *AP_Filesystem::opendir(const char *pathname)
{
const Backend &backend = backend_by_path(pathname);
DirHandle *h = new DirHandle;
if (!h) {
return nullptr;
}
h->dir = backend.fs.opendir(pathname);
if (h->dir == nullptr) {
delete h;
return nullptr;
}
h->fs_index = BACKEND_IDX(backend);
return h;
}
struct dirent *AP_Filesystem::readdir(DirHandle *dirp)
{
if (!dirp) {
return nullptr;
}
const Backend &backend = backends[dirp->fs_index];
return backend.fs.readdir(dirp->dir);
}
int AP_Filesystem::closedir(DirHandle *dirp)
{
if (!dirp) {
return -1;
}
const Backend &backend = backends[dirp->fs_index];
int ret = backend.fs.closedir(dirp->dir);
delete dirp;
return ret;
}
// return free disk space in bytes
int64_t AP_Filesystem::disk_free(const char *path)
{
const Backend &backend = backend_by_path(path);
return backend.fs.disk_free(path);
}
// return total disk space in bytes
int64_t AP_Filesystem::disk_space(const char *path)
{
const Backend &backend = backend_by_path(path);
return backend.fs.disk_space(path);
}
/*
set mtime on a file
*/
bool AP_Filesystem::set_mtime(const char *filename, const uint32_t mtime_sec)
{
const Backend &backend = backend_by_path(filename);
return backend.fs.set_mtime(filename, mtime_sec);
}
// if filesystem is not running then try a remount
bool AP_Filesystem::retry_mount(void)
{
return LOCAL_BACKEND.fs.retry_mount();
}
// unmount filesystem for reboot
void AP_Filesystem::unmount(void)
{
return LOCAL_BACKEND.fs.unmount();
}
namespace AP
{
AP_Filesystem &FS()
{
return fs;
}
}