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Refactor load_proc_partitions_info_cache() a bit (#131) 

Put whole disk device name matching code into a helper function to make
the /proc/partition parsing code easier to understand.

Closes #131 - GParted hangs when non-named device is hung
This commit is contained in:
Mike Fleetwood 2021-01-21 22:01:08 +00:00 committed by Curtis Gedak
parent 45f88c3274
commit 52930f30ae
2 changed files with 50 additions and 45 deletions
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2
include/Proc_Partitions_Info.h
View File

@ -39,6 +39,8 @@ public:
private:
static void initialize_if_required();
static void load_proc_partitions_info_cache();
static bool is_whole_disk_device_name(const Glib::ustring& name);
static bool proc_partitions_info_cache_initialized ;
static std::vector<Glib::ustring> device_paths_cache ;
};

93
src/Proc_Partitions_Info.cc
View File

@ -61,66 +61,69 @@ void Proc_Partitions_Info::load_proc_partitions_info_cache()
if ( proc_partitions )
{
std::string line ;
Glib::ustring device;
while ( getline( proc_partitions, line ) )
{
// Pre-populate BlockSpecial cache with major, minor numbers of
// all names found from /proc/partitions.
Glib::ustring name = Utils::regexp_label( line,
"^[[:blank:]]*[[:digit:]]+[[:blank:]]+[[:digit:]]+[[:blank:]]+[[:digit:]]+[[:blank:]]+([[:graph:]]+)$" );
if ( name == "" )
continue;
// Pre-populate BlockSpecial cache to avoid stat() call for all
// entries from /proc/partitions.
unsigned long maj;
unsigned long min;
if ( sscanf( line.c_str(), "%lu %lu", &maj, &min ) != 2 )
continue;
BlockSpecial::register_block_special( "/dev/" + name, maj, min );
// Recognise only whole disk device names, excluding partitions,
// from /proc/partitions and save in this cache.
//Whole disk devices are the ones we want.
//Device names without a trailing digit refer to the whole disk.
device = Utils::regexp_label( name, "^([^0-9]+)$" );
//Recognize /dev/md* devices (Linux software RAID - mdadm).
//E.g., device = /dev/md127, partition = /dev/md127p1
if ( device == "" )
device = Utils::regexp_label( name, "^(md[0-9]+)$" );
//Recognize /dev/mmcblk* devices.
//E.g., device = /dev/mmcblk0, partition = /dev/mmcblk0p1
if ( device == "" )
device = Utils::regexp_label( name, "^(mmcblk[0-9]+)$" );
// Recognise /dev/nvme*n* devices
// (Non-Volatile Memory Express devices. SSD type devices which
// plug directly into PCIe sockets).
// E.g., device = /dev/nvme0n1, partition = /dev/nvme0n1p1
if ( device == "" )
device = Utils::regexp_label( name, "^(nvme[0-9]+n[0-9]+)$" );
//Device names that end with a #[^p]# are HP Smart Array Devices (disks)
// E.g., device = /dev/cciss/c0d0, partition = /dev/cciss/c0d0p1
// (linux-x.y.z/Documentation/blockdev/cciss.txt)
//Device names for Compaq SMART2 Intelligent Disk Array
// E.g., device = /dev/ida/c0d0, partition = /dev/ida/c0d0p1
// (linux-x.y.z/Documentation/blockdev/cpqarray.txt)
//Device names for Mylex DAC960/AcceleRAID/eXtremeRAID PCI RAID
// E.g., device = /dev/rd/c0d0, partition = /dev/rd/c0d0p1
// (linux-x.y.z/Documentation/blockdev/README.DAC960)
if ( device == "" )
device = Utils::regexp_label( name, "^([a-z]+/c[0-9]+d[0-9]+)$" );
if ( device != "" )
{
//add potential device to the list
device_paths_cache.push_back( "/dev/" + device );
}
// Save recognised whole disk device names for later returning as
// the default GParted partitionable devices.
if (is_whole_disk_device_name(name))
device_paths_cache.push_back("/dev/" + name);
}
proc_partitions .close() ;
}
}
}//GParted
// True only for whole disk device names which GParted will present by default as
// partitionable.
bool Proc_Partitions_Info::is_whole_disk_device_name(const Glib::ustring& name)
{
// Match ordinary whole disk device names.
// E.g.: device = sda (partition = sda1)
if (Utils::regexp_label(name, "^([^0-9]+)$") != "")
return true;
// Match Linux software RAID (mdadm) device names.
// E.g.: device = md127 (partition = md127p1)
if (Utils::regexp_label(name, "^(md[0-9]+)$") != "")
// Match SD/MMC card whole disk devices names.
// E.g.: device = mmcblk0 (partition = mmcblk0p1)
if (Utils::regexp_label(name, "^(md[0-9]+)$") != "")
return true;
// Match NVME (Non-Volatile Memory Express) whole disk device names.
// E.g.: device = nvme0n1 (partition = nvme0n1p1)
if (Utils::regexp_label(name, "^(nvme[0-9]+n[0-9]+)$") != "")
return true;
// Match hardware RAID controller whole disk device names.
// * HP Smart Array (linux-x.y.z/Documentation/scsi/hpsa.rst).
// E.g.: device = cciss/c0d0 (partition = cciss/c0d0p1)
// * Compaq SMART2 Intelligent Disk Array
// (linux-x.y.z/Documentation/admin-guide/devices.txt)
// E.g.: device = ida/c0d0 (partition = ida/c0d0p1)
// * Mylex DAC960/AcceleRAID/eXtremeRAID PCI RAID
// (linux-x.y.z/Documentation/admin-guide/devices.txt)
// E.g.: device = rd/c0d0 (partition = rd/c0d0p1)
if (Utils::regexp_label(name, "^([a-z]+/c[0-9]+d[0-9]+)$") != "")
return true;
return false;
}
} //GParted