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* fhandler_proc.cc (proc_tab_cmp): Fix typo in comment.

Browse Source 
(fhandler_proc::fill_filebuf): Handle return value of 0 from format
	function as error.
	(format_proc_stat): Set errno when returning 0 size.
	(format_proc_partitions): Rewrite method to fetch partition info.
This commit is contained in:
Corinna Vinschen 2011-01-17 13:38:06 +00:00
parent d6d9c269e4
commit 483e9d0022
2 changed files with 151 additions and 84 deletions
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8
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,11 @@
2011-01-17 Corinna Vinschen <corinna@vinschen.de>
* fhandler_proc.cc (proc_tab_cmp): Fix typo in comment.
(fhandler_proc::fill_filebuf): Handle return value of 0 from format
function as error.
(format_proc_stat): Set errno when returning 0 size.
(format_proc_partitions): Rewrite method to fetch partition info.
2011-01-13 Corinna Vinschen <corinna@vinschen.de>
* fhandler_disk_file.cc (fhandler_base::fstat_helper): Always set

227
winsup/cygwin/fhandler_proc.cc
View File

@ -1,6 +1,6 @@
/* fhandler_proc.cc: fhandler for /proc virtual filesystem
Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010 Red Hat, Inc.
Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 Red Hat, Inc.
This file is part of Cygwin.
@ -24,9 +24,9 @@ details. */
#include <sys/utsname.h>
#include <sys/param.h>
#include "ntdll.h"
#include <ctype.h>
#include <winioctl.h>
#include <wchar.h>
#include <wctype.h>
#include "cpuid.h"
#include "mount.h"
@ -85,7 +85,7 @@ proc_tab_cmp (const void *key, const void *memb)
return ret;
}
/* Helper function to perform a binary search of the incoming pathname
/* Helper function to perform a binary search of the incoming pathname
against the alpha-sorted virtual file table. */
virt_tab_t *
virt_tab_search (const char *path, bool prefix, const virt_tab_t *table,
@ -351,7 +351,8 @@ fhandler_proc::fill_filebuf ()
if (fileid < PROC_LINK_COUNT && proc_tab[fileid].format_func)
{
filesize = proc_tab[fileid].format_func (NULL, filebuf);
return true;
if (filesize > 0)
return true;
}
return false;
}
@ -550,7 +551,10 @@ format_proc_stat (void *, char *&destbuf)
"status %p", ret);
}
if (!NT_SUCCESS (ret))
return 0;
{
__seterrno_from_nt_status (ret);
return 0;
}
pages_in = spi->PagesRead;
pages_out = spi->PagefilePagesWritten + spi->MappedFilePagesWritten;
@ -1085,15 +1089,15 @@ format_proc_cpuinfo (void *, char *&destbuf)
static _off64_t
format_proc_partitions (void *, char *&destbuf)
{
char devname[NAME_MAX + 1];
OBJECT_ATTRIBUTES attr;
HANDLE dirhdl, devhdl;
IO_STATUS_BLOCK io;
NTSTATUS status;
HANDLE dirhdl;
tmp_pathbuf tp;
char *buf = tp.c_get ();
char *bufptr = buf;
char *ioctl_buf = tp.c_get ();
/* Open \Device object directory. */
wchar_t wpath[MAX_PATH] = L"\\Device";
@ -1103,102 +1107,157 @@ format_proc_partitions (void *, char *&destbuf)
if (!NT_SUCCESS (status))
{
debug_printf ("NtOpenDirectoryObject, status %p", status);
__seterrno_from_nt_status (status);
return 0;
}
print ("major minor #blocks name\n\n");
/* Traverse \Device directory ... */
PDIRECTORY_BASIC_INFORMATION dbi = (PDIRECTORY_BASIC_INFORMATION)
alloca (640);
BOOLEAN restart = TRUE;
bool got_one = false;
ULONG context = 0;
while (NT_SUCCESS (NtQueryDirectoryObject (dirhdl, dbi, 640, TRUE, restart,
&context, NULL)))
{
HANDLE devhdl;
PARTITION_INFORMATION_EX *pix = NULL;
PARTITION_INFORMATION *pi = NULL;
DWORD bytes_read;
DWORD part_cnt;
unsigned long long size;
device dev;
restart = FALSE;
sys_wcstombs (devname, NAME_MAX + 1, dbi->ObjectName.Buffer,
dbi->ObjectName.Length / 2);
/* ... and check for a "Harddisk[0-9]*" entry. */
if (!strncasematch (devname, "Harddisk", 8)
|| dbi->ObjectName.Length < 18
|| !isdigit (devname[8]))
if (dbi->ObjectName.Length < 18
|| wcsncasecmp (dbi->ObjectName.Buffer, L"Harddisk", 8) != 0
|| !iswdigit (dbi->ObjectName.Buffer[8]))
continue;
/* Construct path name for partitions, starting with 0, which is the
whole disk, and try to open.
Note that the correct way to do this would be to open the HarddiskX
directory and enumerate the Partition entries. However, while the
partition entries itself are accessible for query by everyone, the
HarddiskX parent directory is only queryable by SYSTEM and Admins.
This way we circumvent this nonsensical restriction. Let's assume
we never have more than 99 partitions per disk for now... */
for (int part_num = 0; part_num < 99; ++part_num)
/* Got it. Now construct the path to the entire disk, which is
"\\Device\\HarddiskX\\Partition0", and open the disk with
minimum permssions. */
unsigned long drive_num = wcstoul (dbi->ObjectName.Buffer + 8, NULL, 10);
wcscpy (wpath, dbi->ObjectName.Buffer);
PWCHAR wpart = wpath + dbi->ObjectName.Length / sizeof (WCHAR);
__small_swprintf (wpart, L"\\Partition0");
upath.Length = dbi->ObjectName.Length
+ wcslen (wpart) * sizeof (WCHAR);
upath.MaximumLength = upath.Length + sizeof (WCHAR);
InitializeObjectAttributes (&attr, &upath, OBJ_CASE_INSENSITIVE,
dirhdl, NULL);
/* Up to W2K the handle needs read access to fetch the partition info. */
status = NtOpenFile (&devhdl, wincap.has_disk_ex_ioctls ()
? READ_CONTROL
: READ_CONTROL | FILE_READ_DATA,
&attr, &io, FILE_SHARE_VALID_FLAGS, 0);
if (!NT_SUCCESS (status))
{
wcscpy (wpath, dbi->ObjectName.Buffer);
__small_swprintf (wpath + dbi->ObjectName.Length / 2,
L"\\Partition%d", part_num);
upath.Length = 22 + dbi->ObjectName.Length;
upath.MaximumLength = upath.Length + 2;
InitializeObjectAttributes (&attr, &upath, OBJ_CASE_INSENSITIVE,
dirhdl, NULL);
status = NtOpenFile (&devhdl, READ_CONTROL, &attr, &io,
FILE_SHARE_VALID_FLAGS, 0);
if (!NT_SUCCESS (status))
{
if (status == STATUS_OBJECT_NAME_NOT_FOUND
|| status == STATUS_OBJECT_PATH_NOT_FOUND)
break;
debug_printf ("NtOpenFile(%s), status %p", devname, status);
continue;
}
/* Use a buffer since some ioctl buffers aren't fixed size. */
char buf[256];
PARTITION_INFORMATION *pi = NULL;
PARTITION_INFORMATION_EX *pix = NULL;
DISK_GEOMETRY *dg = NULL;
DWORD bytes;
unsigned long drive_number = strtoul (devname + 8, NULL, 10);
unsigned long long size;
if (wincap.has_disk_ex_ioctls ()
&& DeviceIoControl (devhdl, IOCTL_DISK_GET_PARTITION_INFO_EX,
NULL, 0, buf, 256, &bytes, NULL))
{
pix = (PARTITION_INFORMATION_EX *) buf;
size = pix->PartitionLength.QuadPart;
}
else if (DeviceIoControl (devhdl, IOCTL_DISK_GET_PARTITION_INFO,
NULL, 0, buf, 256, &bytes, NULL))
{
pi = (PARTITION_INFORMATION *) buf;
size = pi->PartitionLength.QuadPart;
}
else if (DeviceIoControl (devhdl, IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL, 0, buf, 256, &bytes, NULL))
{
dg = (DISK_GEOMETRY *) buf;
size = (unsigned long long) dg->Cylinders.QuadPart
* dg->TracksPerCylinder
* dg->SectorsPerTrack
* dg->BytesPerSector;
}
else
size = 0;
if (!pi && !pix && !dg)
debug_printf ("DeviceIoControl %E");
else
{
device dev;
dev.parsedisk (drive_number, part_num);
bufptr += __small_sprintf (bufptr, "%5d %5d %9U %s\n",
dev.major, dev.minor,
size >> 10, dev.name + 5);
}
NtClose (devhdl);
debug_printf ("NtOpenFile(%S), status %p", &upath, status);
__seterrno_from_nt_status (status);
continue;
}
if (!got_one)
{
print ("major minor #blocks name\n\n");
got_one = true;
}
/* Fetch partition info for the entire disk to get its size. */
if (wincap.has_disk_ex_ioctls ()
&& DeviceIoControl (devhdl, IOCTL_DISK_GET_PARTITION_INFO_EX, NULL, 0,
ioctl_buf, NT_MAX_PATH, &bytes_read, NULL))
{
pix = (PARTITION_INFORMATION_EX *) ioctl_buf;
size = pix->PartitionLength.QuadPart;
}
else if (DeviceIoControl (devhdl, IOCTL_DISK_GET_PARTITION_INFO, NULL, 0,
ioctl_buf, NT_MAX_PATH, &bytes_read, NULL))
{
pi = (PARTITION_INFORMATION *) ioctl_buf;
size = pi->PartitionLength.QuadPart;
}
else if (DeviceIoControl (devhdl, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
ioctl_buf, NT_MAX_PATH, &bytes_read, NULL))
{
/* NT4 doesn't support to call IOCTL_DISK_GET_PARTITION_INFO for the
entire drive. */
DISK_GEOMETRY *dg = (DISK_GEOMETRY *) ioctl_buf;
size = (unsigned long long) dg->Cylinders.QuadPart
* dg->TracksPerCylinder
* dg->SectorsPerTrack
* dg->BytesPerSector;
}
else
{
debug_printf ("DeviceIoControl (%S, "
"IOCTL_DISK_GET_PARTITION_INFO{_EX}) %E", &upath);
size = 0;
}
dev.parsedisk (drive_num, 0);
bufptr += __small_sprintf (bufptr, "%5d %5d %9U %s\n",
dev.major, dev.minor,
size >> 10, dev.name + 5);
/* Fetch drive layout info to get size of all partitions on the disk. */
if (wincap.has_disk_ex_ioctls ()
&& DeviceIoControl (devhdl, IOCTL_DISK_GET_DRIVE_LAYOUT_EX,
NULL, 0, ioctl_buf, NT_MAX_PATH, &bytes_read, NULL))
{
PDRIVE_LAYOUT_INFORMATION_EX pdlix = (PDRIVE_LAYOUT_INFORMATION_EX)
ioctl_buf;
part_cnt = pdlix->PartitionCount;
pix = pdlix->PartitionEntry;
}
else if (DeviceIoControl (devhdl, IOCTL_DISK_GET_DRIVE_LAYOUT,
NULL, 0, ioctl_buf, NT_MAX_PATH, &bytes_read, NULL))
{
PDRIVE_LAYOUT_INFORMATION pdli = (PDRIVE_LAYOUT_INFORMATION) ioctl_buf;
part_cnt = pdli->PartitionCount;
pi = pdli->PartitionEntry;
}
else
debug_printf ("DeviceIoControl(%S, "
"IOCTL_DISK_GET_DRIVE_LAYOUT{_EX}): %E", &upath);
/* Loop over partitions. */
if (pix || pi)
for (DWORD i = 0; i < part_cnt; ++i)
{
DWORD part_num;
if (pix)
{
size = pix->PartitionLength.QuadPart;
part_num = pix->PartitionNumber;
++pix;
}
else
{
size = pi->PartitionLength.QuadPart;
/* Pre-W2K you can't rely on the partition number info for
unused partitions. */
if (pi->PartitionType == PARTITION_ENTRY_UNUSED
|| pi->PartitionType == PARTITION_EXTENDED)
part_num = 0;
else
part_num = pi->PartitionNumber;
++pi;
}
/* A partition number of 0 denotes an extended partition or a
filler entry as described in fhandler_dev_floppy::lock_partition.
Just skip. */
if (part_num == 0)
continue;
dev.parsedisk (drive_num, part_num);
bufptr += __small_sprintf (bufptr, "%5d %5d %9U %s\n",
dev.major, dev.minor,
size >> 10, dev.name + 5);
}
NtClose (devhdl);
}
NtClose (dirhdl);
if (!got_one)
return 0;
destbuf = (char *) crealloc_abort (destbuf, bufptr - buf);
memcpy (destbuf, buf, bufptr - buf);
return bufptr - buf;