/*! Scans the device passed in for partitioning systems. If none are found,
a partition containing the whole device is created.
All created partitions are added to the gPartitions list.
*/
status_t
add_partitions_for(int fd, bool mountFileSystems, bool isBootDevice)
{
TRACE(("add_partitions_for(fd = %d, mountFS = %s)\n", fd,
mountFileSystems ? "yes" : "no"));
Partition *partition = new Partition(fd);
// set some magic/default values
partition->block_size = 512;
partition->size = partition->Size();
// add this partition to the list of partitions, if it contains
// or might contain a file system
if ((partition->Scan(mountFileSystems, isBootDevice) == B_OK
&& partition->IsFileSystem())
|| (!partition->IsPartitioningSystem() && !mountFileSystems)) {
gPartitions.Add(partition);
return B_OK;
}
// if not, we no longer need the partition
delete partition;
return B_OK;
}
status_t
mount_file_systems(stage2_args *args)
{
// mount other partitions on boot device (if any)
NodeIterator iterator = gPartitions.GetIterator();
Partition *partition = NULL;
while ((partition = (Partition *)iterator.Next()) != NULL) {
// don't scan known partitions again
if (partition->IsFileSystem())
continue;
// remove the partition if it doesn't contain a (known) file system
if (partition->Scan(true) != B_OK && !partition->IsFileSystem()) {
gPartitions.Remove(partition);
delete partition;
}
}
// add all block devices the platform has for us
status_t status = platform_add_block_devices(args, &gBootDevices);
if (status < B_OK)
return status;
iterator = gBootDevices.GetIterator();
Node *device = NULL, *last = NULL;
while ((device = iterator.Next()) != NULL) {
// don't scan former boot device again
if (device == sBootDevice)
continue;
if (add_partitions_for(device, true) == B_OK) {
// ToDo: we can't delete the object here, because it must
// be removed from the list before we know that it was
// deleted.
/* // if the Release() deletes the object, we need to skip it
if (device->Release() > 0) {
list_remove_item(&gBootDevices, device);
device = last;
}
*/
(void)last;
}
last = device;
}
if (gPartitions.IsEmpty())
return B_ENTRY_NOT_FOUND;
#if 0
void *cookie;
if (gRoot->Open(&cookie, O_RDONLY) == B_OK) {
Directory *directory;
while (gRoot->GetNextNode(cookie, (Node **)&directory) == B_OK) {
char name[256];
if (directory->GetName(name, sizeof(name)) == B_OK)
printf(":: %s (%p)\n", name, directory);
void *subCookie;
if (directory->Open(&subCookie, O_RDONLY) == B_OK) {
while (directory->GetNextEntry(subCookie, name, sizeof(name)) == B_OK) {
printf("\t%s\n", name);
}
directory->Close(subCookie);
}
}
gRoot->Close(cookie);
}
#endif
return B_OK;
}
status_t
Partition::Scan(bool mountFileSystems, bool isBootDevice)
{
// scan for partitions first (recursively all eventual children as well)
TRACE(("%p Partition::Scan()\n", this));
// if we were not booted from the real boot device, we won't scan
// the device we were booted from (which is likely to be a slow
// floppy or CD)
if (isBootDevice && gKernelArgs.boot_volume.GetBool(
BOOT_VOLUME_BOOTED_FROM_IMAGE, false)) {
return B_ENTRY_NOT_FOUND;
}
const partition_module_info *bestModule = NULL;
void *bestCookie = NULL;
float bestPriority = -1;
for (int32 i = 0; i < sNumPartitionModules; i++) {
const partition_module_info *module = sPartitionModules[i];
void *cookie = NULL;
NodeOpener opener(this, O_RDONLY);
TRACE(("check for partitioning_system: %s\n", module->pretty_name));
float priority
= module->identify_partition(opener.Descriptor(), this, &cookie);
if (priority < 0.0)
continue;
TRACE((" priority: %ld\n", (int32)(priority * 1000)));
if (priority <= bestPriority) {
// the disk system recognized the partition worse than the currently
// best one
module->free_identify_partition_cookie(this, cookie);
continue;
}
// a new winner, replace the previous one
if (bestModule)
bestModule->free_identify_partition_cookie(this, bestCookie);
bestModule = module;
bestCookie = cookie;
bestPriority = priority;
}
// find the best FS module
const file_system_module_info *bestFSModule = NULL;
float bestFSPriority = -1;
for (int32 i = 0; i < sNumFileSystemModules; i++) {
if (sFileSystemModules[i]->identify_file_system == NULL)
continue;
float priority = sFileSystemModules[i]->identify_file_system(this);
if (priority <= 0)
continue;
if (priority > bestFSPriority) {
bestFSModule = sFileSystemModules[i];
bestFSPriority = priority;
}
}
// now let the best matching disk system scan the partition
if (bestModule && bestPriority >= bestFSPriority) {
NodeOpener opener(this, O_RDONLY);
status_t status = bestModule->scan_partition(opener.Descriptor(), this,
bestCookie);
bestModule->free_identify_partition_cookie(this, bestCookie);
if (status != B_OK) {
dprintf("Partitioning module `%s' recognized the partition, but "
"failed to scan it\n", bestModule->pretty_name);
return status;
}
fIsPartitioningSystem = true;
content_type = bestModule->pretty_name;
flags |= B_PARTITION_PARTITIONING_SYSTEM;
// now that we've found something, check our children
// out as well!
NodeIterator iterator = fChildren.GetIterator();
Partition *child = NULL;
while ((child = (Partition *)iterator.Next()) != NULL) {
TRACE(("%p Partition::Scan(): scan child %p (start = %Ld, size "
"= %Ld, parent = %p)!\n", this, child, child->offset,
child->size, child->Parent()));
child->Scan(mountFileSystems);
if (!mountFileSystems || child->IsFileSystem()) {
// move the partitions containing file systems to the partition
// list
fChildren.Remove(child);
gPartitions.Add(child);
}
}
// remove all unused children (we keep only file systems)
while ((child = (Partition *)fChildren.Head()) != NULL) {
fChildren.Remove(child);
delete child;
}
// remember the name of the module that identified us
fModuleName = bestModule->module.name;
return B_OK;
}
// scan for file systems
if (mountFileSystems) {
// TODO: Use the FS module we've got, if any. Requires to implement the
// identify_file_system() hook in every FS.
return Mount();
}
return B_ENTRY_NOT_FOUND;
}
