fsw_status_t fsw_posix_open_dno(struct fsw_posix_volume *pvol, const char *path, int required_type, struct fsw_shandle *shand)
{
fsw_status_t status;
struct fsw_dnode *dno;
struct fsw_dnode *target_dno;
struct fsw_string lookup_path;
lookup_path.type = FSW_STRING_TYPE_ISO88591;
lookup_path.len = strlen(path);
lookup_path.size = lookup_path.len;
lookup_path.data = (void *)path;
// resolve the path (symlinks along the way are automatically resolved)
status = fsw_dnode_lookup_path(pvol->vol->root, &lookup_path, '/', &dno);
if (status) {
fprintf(stderr, "fsw_posix_open_dno: fsw_dnode_lookup_path returned %d\n", status);
return status;
}
// if the final node is a symlink, also resolve it
status = fsw_dnode_resolve(dno, &target_dno);
fsw_dnode_release(dno);
if (status) {
fprintf(stderr, "fsw_posix_open_dno: fsw_dnode_resolve returned %d\n", status);
return status;
}
dno = target_dno;
// check that it is a regular file
status = fsw_dnode_fill(dno);
if (status) {
fprintf(stderr, "fsw_posix_open_dno: fsw_dnode_fill returned %d\n", status);
fsw_dnode_release(dno);
return status;
}
if (dno->type != required_type) {
fprintf(stderr, "fsw_posix_open_dno: dnode is not of the requested type\n");
fsw_dnode_release(dno);
return FSW_UNSUPPORTED;
}
// open shandle
status = fsw_shandle_open(dno, shand);
if (status) {
fprintf(stderr, "fsw_posix_open_dno: fsw_shandle_open returned %d\n", status);
}
fsw_dnode_release(dno);
return status;
}
void fsw_dnode_release(struct fsw_dnode *dno)
{
struct fsw_volume *vol = dno->vol;
struct fsw_dnode *parent_dno;
dno->refcount--;
if (dno->refcount == 0) {
parent_dno = dno->parent;
// de-register from volume's list
if (dno->next)
dno->next->prev = dno->prev;
if (dno->prev)
dno->prev->next = dno->next;
if (vol->dnode_head == dno)
vol->dnode_head = dno->next;
// run fstype-specific cleanup
vol->fstype_table->dnode_free(vol, dno);
fsw_strfree(&dno->name);
fsw_free(dno);
// release our pointer to the parent, possibly deallocating it, too
if (parent_dno)
fsw_dnode_release(parent_dno);
}
}
EFI_STATUS fsw_efi_dir_read(IN FSW_FILE_DATA *File,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer)
{
EFI_STATUS Status;
FSW_VOLUME_DATA *Volume = (FSW_VOLUME_DATA *)File->shand.dnode->vol->host_data;
struct fsw_dnode *dno;
#if DEBUG_LEVEL
Print(L"fsw_efi_dir_read...\n");
#endif
// read the next entry
Status = fsw_efi_map_status(fsw_dnode_dir_read(&File->shand, &dno),
Volume);
if (Status == EFI_NOT_FOUND) {
// end of directory
*BufferSize = 0;
#if DEBUG_LEVEL
Print(L"...no more entries\n");
#endif
return EFI_SUCCESS;
}
if (EFI_ERROR(Status))
return Status;
// get info into buffer
Status = fsw_efi_dnode_fill_FileInfo(Volume, dno, BufferSize, Buffer);
fsw_dnode_release(dno);
return Status;
}
fsw_status_t fsw_dnode_resolve(struct fsw_dnode *dno, struct fsw_dnode **target_dno_out)
{
fsw_status_t status;
struct fsw_string target_name;
struct fsw_dnode *target_dno;
/* Linux kernel max link count is 40 */
int link_count = 40;
fsw_dnode_retain(dno);
while (--link_count > 0) {
// get full information
status = fsw_dnode_fill(dno);
if (status)
goto errorexit;
if (dno->type != FSW_DNODE_TYPE_SYMLINK) {
// found a non-symlink target, return it
*target_dno_out = dno;
return FSW_SUCCESS;
}
if (dno->parent == NULL) { // safety measure, cannot happen in theory
status = FSW_NOT_FOUND;
goto errorexit;
}
// read the link's target
status = fsw_dnode_readlink(dno, &target_name);
if (status)
goto errorexit;
// resolve it
status = fsw_dnode_lookup_path(dno->parent, &target_name, '/', &target_dno);
fsw_strfree(&target_name);
if (status)
goto errorexit;
// target_dno becomes the new dno
fsw_dnode_release(dno);
dno = target_dno; // is already retained
}
if(link_count == 0)
status = FSW_NOT_FOUND;
errorexit:
fsw_dnode_release(dno);
return status;
}
EFI_STATUS fsw_efi_dir_open(IN FSW_FILE_DATA *File,
OUT EFI_FILE_PROTOCOL **NewHandle,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT64 Attributes)
{
EFI_STATUS Status;
FSW_VOLUME_DATA *Volume = (FSW_VOLUME_DATA *)File->shand.dnode->vol->host_data;
struct fsw_dnode *dno;
struct fsw_dnode *target_dno;
struct fsw_string lookup_path;
#if DEBUG_LEVEL
Print(L"fsw_efi_dir_open: '%s'\n", FileName);
#endif
if (OpenMode != EFI_FILE_MODE_READ)
return EFI_WRITE_PROTECTED;
lookup_path.type = FSW_STRING_TYPE_UTF16;
lookup_path.len = (int)StrLen(FileName);
lookup_path.size = lookup_path.len * sizeof(fsw_u16);
lookup_path.data = FileName;
// resolve the path (symlinks along the way are automatically resolved)
Status = fsw_efi_map_status(fsw_dnode_lookup_path(File->shand.dnode,
&lookup_path, '\\',
&dno),
Volume);
if (EFI_ERROR(Status))
return Status;
// if the final node is a symlink, also resolve it
Status = fsw_efi_map_status(fsw_dnode_resolve(dno, &target_dno),
Volume);
fsw_dnode_release(dno);
if (EFI_ERROR(Status))
return Status;
dno = target_dno;
// make a new EFI handle for the target dnode
Status = fsw_efi_dnode_to_FileHandle(dno, NewHandle);
fsw_dnode_release(dno);
return Status;
}
void fsw_unmount(struct fsw_volume *vol)
{
if (vol->root)
fsw_dnode_release(vol->root);
/// @todo check that no other dnodes are still around
vol->fstype_table->volume_free(vol);
fsw_blockcache_free(vol);
fsw_strfree(&vol->label);
fsw_free(vol);
}
struct dirent * fsw_posix_readdir(struct fsw_posix_dir *dir)
{
fsw_status_t status;
struct fsw_dnode *dno;
static struct dirent dent;
// get next entry from file system
status = fsw_dnode_dir_read(&dir->shand, &dno);
if (status) {
fprintf(stderr, "fsw_posix_readdir: fsw_dnode_dir_read returned %d\n", status);
return NULL;
}
status = fsw_dnode_fill(dno);
if (status) {
fprintf(stderr, "fsw_posix_readdir: fsw_dnode_fill returned %d\n", status);
fsw_dnode_release(dno);
return NULL;
}
// fill dirent structure
dent.d_fileno = dno->dnode_id;
dent.d_reclen = 8 + dno->name.size + 1;
switch (dno->type) {
case FSW_DNODE_TYPE_FILE:
dent.d_type = DT_REG;
break;
case FSW_DNODE_TYPE_DIR:
dent.d_type = DT_DIR;
break;
case FSW_DNODE_TYPE_SYMLINK:
dent.d_type = DT_LNK;
break;
default:
dent.d_type = DT_UNKNOWN;
break;
}
dent.d_namlen = dno->name.size;
memcpy(dent.d_name, dno->name.data, dno->name.size);
dent.d_name[dent.d_namlen] = 0;
return &dent;
}
void fsw_shandle_close(struct fsw_shandle *shand)
{
if (shand->extent.type == FSW_EXTENT_TYPE_BUFFER)
fsw_free(shand->extent.buffer);
fsw_dnode_release(shand->dnode);
}
fsw_status_t fsw_dnode_lookup_path(struct fsw_dnode *dno,
struct fsw_string *lookup_path, char separator,
struct fsw_dnode **child_dno_out)
{
fsw_status_t status;
struct fsw_volume *vol = dno->vol;
struct fsw_dnode *child_dno = NULL;
struct fsw_string lookup_name;
struct fsw_string remaining_path;
int root_if_empty;
remaining_path = *lookup_path;
fsw_dnode_retain(dno);
// loop over the path
for (root_if_empty = 1; fsw_strlen(&remaining_path) > 0; root_if_empty = 0) {
// parse next path component
fsw_strsplit(&lookup_name, &remaining_path, separator);
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_dnode_lookup_path: split into %d '%s' and %d '%s'\n"),
lookup_name.len, lookup_name.data,
remaining_path.len, remaining_path.data));
if (fsw_strlen(&lookup_name) == 0) { // empty path component
if (root_if_empty)
child_dno = vol->root;
else
child_dno = dno;
fsw_dnode_retain(child_dno);
} else {
// do an actual directory lookup
// ensure we have full information
status = fsw_dnode_fill(dno);
if (status)
goto errorexit;
// resolve symlink if necessary
if (dno->type == FSW_DNODE_TYPE_SYMLINK) {
status = fsw_dnode_resolve(dno, &child_dno);
if (status)
goto errorexit;
// symlink target becomes the new dno
fsw_dnode_release(dno);
dno = child_dno; // is already retained
child_dno = NULL;
// ensure we have full information
status = fsw_dnode_fill(dno);
if (status)
goto errorexit;
}
// make sure we operate on a directory
if (dno->type != FSW_DNODE_TYPE_DIR) {
return FSW_UNSUPPORTED;
goto errorexit;
}
// check special paths
if (fsw_streq_cstr(&lookup_name, ".")) { // self directory
child_dno = dno;
fsw_dnode_retain(child_dno);
} else if (fsw_streq_cstr(&lookup_name, "..")) { // parent directory
if (dno->parent == NULL) {
// We cannot go up from the root directory. Caution: Certain apps like the EFI shell
// rely on this behaviour!
status = FSW_NOT_FOUND;
goto errorexit;
}
child_dno = dno->parent;
fsw_dnode_retain(child_dno);
} else {
// do an actual lookup
status = vol->fstype_table->dir_lookup(vol, dno, &lookup_name, &child_dno);
if (status)
goto errorexit;
}
}
// child_dno becomes the new dno
fsw_dnode_release(dno);
dno = child_dno; // is already retained
child_dno = NULL;
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_dnode_lookup_path: now at inode %d\n"), dno->dnode_id));
}
*child_dno_out = dno;
return FSW_SUCCESS;
errorexit:
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_dnode_lookup_path: leaving with error %d\n"), status));
fsw_dnode_release(dno);
if (child_dno != NULL)
fsw_dnode_release(child_dno);
return status;
}
//
// Common function to fill an EFI_FILE_INFO with information about a dnode.
// there is caller responsible to allocate buffer
//
EFI_STATUS fsw_efi_dnode_fill_FileInfo(IN FSW_VOLUME_DATA *Volume,
IN struct fsw_dnode *dno,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer)
{
EFI_STATUS Status;
EFI_FILE_INFO *FileInfo;
UINTN RequiredSize;
struct fsw_dnode_stat_str sb;
struct fsw_dnode *target_dno;
// make sure the dnode has complete info
Status = fsw_efi_map_status(fsw_dnode_fill(dno), Volume);
if (EFI_ERROR(Status))
return Status;
// TODO: check/assert that the dno's name is in UTF16
// check buffer size
RequiredSize = SIZE_OF_EFI_FILE_INFO + fsw_efi_strsize(&dno->name);
if (*BufferSize < RequiredSize) {
// TODO: wind back the directory in this case
#if DEBUG_LEVEL
Print(L"...BUFFER TOO SMALL\n");
#endif
*BufferSize = RequiredSize;
return EFI_BUFFER_TOO_SMALL;
}
// fill structure
ZeroMem (Buffer, RequiredSize);
FileInfo = (EFI_FILE_INFO *) Buffer;
// Use original name (name of symlink if any)
fsw_efi_strcpy (FileInfo->FileName, &dno->name);
// if the node is a symlink, resolve it
Status = fsw_efi_map_status (fsw_dnode_resolve (dno, &target_dno), Volume);
fsw_dnode_release (dno);
if (EFI_ERROR (Status))
return Status;
dno = target_dno;
// make sure the dnode has complete info
Status = fsw_efi_map_status (fsw_dnode_fill (dno), Volume);
if (EFI_ERROR (Status))
return Status;
FileInfo->Size = RequiredSize;
FileInfo->FileSize = dno->size;
FileInfo->Attribute = EFI_FILE_READ_ONLY;
if (dno->type == FSW_DNODE_TYPE_DIR)
FileInfo->Attribute |= EFI_FILE_DIRECTORY;
// get the missing info from the fs driver
ZeroMem(&sb, sizeof(struct fsw_dnode_stat_str));
sb.store_time_posix = fsw_efi_store_time_posix;
sb.store_attr_posix = fsw_efi_store_attr_posix;
sb.host_data = FileInfo;
Status = fsw_efi_map_status(fsw_dnode_stat(dno, &sb), Volume);
if (EFI_ERROR(Status))
return Status;
FileInfo->PhysicalSize = sb.used_bytes;
// prepare for return
*BufferSize = RequiredSize;
#if DEBUG_LEVEL
Print(L"...returning '%s'\n", FileInfo->FileName);
#endif
return EFI_SUCCESS;
}