int vfs_file(char *pathname, int idx, char *buffer)
{
char volumename[VFS_NAME_LENGTH];
char dirname[VFS_NAME_LENGTH];
fs_t *fs = NULL;
int ret;
if (vfs_start_op() != VFS_OK)
return VFS_UNUSABLE;
if (vfs_parse_pathname(pathname, volumename, dirname) != VFS_OK) {
vfs_end_op();
return VFS_ERROR;
}
semaphore_P(vfs_table.sem);
fs = vfs_get_filesystem(volumename);
if(fs == NULL) {
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_NO_SUCH_FS;
}
ret = fs->file(fs, dirname, idx, buffer);
semaphore_V(vfs_table.sem);
vfs_end_op();
return ret;
}
int vfs_create(char *pathname, int size)
{
char volumename[VFS_NAME_LENGTH];
char filename[VFS_NAME_LENGTH];
fs_t *fs = NULL;
int ret;
KERNEL_ASSERT(size >= 0);
if (vfs_start_op() != VFS_OK)
return VFS_UNUSABLE;
if(vfs_parse_pathname(pathname, volumename, filename) != VFS_OK) {
vfs_end_op();
return VFS_ERROR;
}
semaphore_P(vfs_table.sem);
fs = vfs_get_filesystem(volumename);
if(fs == NULL) {
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_NO_SUCH_FS;
}
ret = fs->create(fs, filename, size);
semaphore_V(vfs_table.sem);
vfs_end_op();
return ret;
}
/**
* Removes given file from filesystem.
*
* @param pathname Full name of the file, including mountpoint.
*
* @return VFS_OK on success, negative (VFS_*) on failure.
*
*/
int vfs_remove(const char *pathname)
{
char volumename[VFS_NAME_LENGTH];
char filename[VFS_NAME_LENGTH];
fs_t *fs = NULL;
int ret;
if (vfs_start_op() != VFS_OK)
return VFS_UNUSABLE;
if (vfs_parse_pathname(pathname, volumename, filename) != VFS_OK) {
vfs_end_op();
return VFS_INVALID_PARAMS;
}
semaphore_P(vfs_table.sem);
fs = vfs_get_filesystem(volumename);
if(fs == NULL) {
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_NO_SUCH_FS;
}
ret = fs->remove(fs, filename);
semaphore_V(vfs_table.sem);
vfs_end_op();
return ret;
}
int vfs_file(char *pathname, int idx, char *buffer)
{
char volumename[VFS_NAME_LENGTH];
char dirname[VFS_NAME_LENGTH];
fs_t *fs = NULL;
int ret;
if (vfs_start_op() != VFS_OK)
return VFS_UNUSABLE;
if (pathname == NULL) {
semaphore_P(vfs_table.sem);
for (ret = 0; ret < CONFIG_MAX_FILESYSTEMS && idx != 0; ret++) {
if (vfs_table.filesystems[ret].filesystem != NULL)
idx--;
}
/* Error can be caused if idx was <= 0 or idx was higher than the
* number of mounted volumes
*/
if (idx != 0) {
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_ERROR;
}
stringcopy(buffer, vfs_table.filesystems[ret].mountpoint, VFS_NAME_LENGTH);
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_OK;
}
if (vfs_parse_pathname(pathname, volumename, dirname) != VFS_OK) {
vfs_end_op();
return VFS_ERROR;
}
semaphore_P(vfs_table.sem);
fs = vfs_get_filesystem(volumename);
if(fs == NULL) {
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_NO_SUCH_FS;
}
ret = fs->file(fs, dirname, idx, buffer);
semaphore_V(vfs_table.sem);
vfs_end_op();
return ret;
}
int vfs_filecount(char *pathname)
{
char volumename[VFS_NAME_LENGTH];
char dirname[VFS_NAME_LENGTH];
fs_t *fs = NULL;
int ret;
if (vfs_start_op() != VFS_OK)
return VFS_UNUSABLE;
if (pathname == NULL) {
semaphore_P(vfs_table.sem);
for (ret = 0; ret < CONFIG_MAX_FILESYSTEMS; ret++) {
if (vfs_table.filesystems[ret].filesystem == NULL)
break;
}
semaphore_V(vfs_table.sem);
vfs_end_op();
return ret;
}
if (vfs_parse_pathname(pathname, volumename, dirname) != VFS_OK) {
vfs_end_op();
return VFS_ERROR;
}
semaphore_P(vfs_table.sem);
fs = vfs_get_filesystem(volumename);
if(fs == NULL) {
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_NO_SUCH_FS;
}
ret = fs->filecount(fs, dirname);
semaphore_V(vfs_table.sem);
vfs_end_op();
return ret;
}
openfile_t vfs_open(char *pathname)
{
openfile_t file;
int fileid;
char volumename[VFS_NAME_LENGTH];
char filename[VFS_NAME_LENGTH];
fs_t *fs = NULL;
if (vfs_start_op() != VFS_OK)
return VFS_UNUSABLE;
if (vfs_parse_pathname(pathname, volumename, filename) != VFS_OK) {
vfs_end_op();
return VFS_ERROR;
}
semaphore_P(vfs_table.sem);
semaphore_P(openfile_table.sem);
for(file=0; file<CONFIG_MAX_OPEN_FILES; file++) {
if(openfile_table.files[file].filesystem == NULL) {
break;
}
}
if(file >= CONFIG_MAX_OPEN_FILES) {
semaphore_V(openfile_table.sem);
semaphore_V(vfs_table.sem);
kprintf("VFS: Warning, maximum number of open files exceeded.");
vfs_end_op();
return VFS_LIMIT;
}
fs = vfs_get_filesystem(volumename);
if(fs == NULL) {
semaphore_V(openfile_table.sem);
semaphore_V(vfs_table.sem);
vfs_end_op();
return VFS_NO_SUCH_FS;
}
openfile_table.files[file].filesystem = fs;
semaphore_V(openfile_table.sem);
semaphore_V(vfs_table.sem);
fileid = fs->open(fs, filename);
if(fileid < 0) {
semaphore_P(openfile_table.sem);
openfile_table.files[file].filesystem = NULL;
semaphore_V(openfile_table.sem);
vfs_end_op();
return fileid; /* negative -> error*/
}
openfile_table.files[file].fileid = fileid;
openfile_table.files[file].seek_position = 0;
vfs_end_op();
return file;
}
