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/* quotactl.cc: code for manipulating disk quotas
Copyright 2014 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygtls.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "ntdll.h"
#include "tls_pbuf.h"
#include <sys/mount.h>
#include <sys/quota.h>
#define PGQI_SIZE (sizeof (FILE_GET_QUOTA_INFORMATION) + SECURITY_MAX_SID_SIZE)
#define PFQI_SIZE (sizeof (FILE_QUOTA_INFORMATION) + SECURITY_MAX_SID_SIZE)
/* Modelled after the Linux quotactl function. */
extern "C" int
quotactl (int cmd, const char *special, int id, caddr_t addr)
{
ACCESS_MASK access = FILE_READ_DATA;
cygsid sid;
path_conv pc;
tmp_pathbuf tp;
UNICODE_STRING path;
OBJECT_ATTRIBUTES attr;
NTSTATUS status;
HANDLE fh;
IO_STATUS_BLOCK io;
FILE_FS_CONTROL_INFORMATION ffci;
int ret = 0;
uint32_t subcmd = (uint32_t) cmd >> SUBCMDSHIFT;
uint32_t type = (uint32_t) cmd & SUBCMDMASK;
if (type != USRQUOTA && type != GRPQUOTA)
{
set_errno (EINVAL);
return -1;
}
switch (subcmd)
{
case Q_SYNC:
if (!special)
return 0;
access |= FILE_WRITE_DATA;
break;
case Q_QUOTAON:
if (id < QFMT_VFS_OLD || id > QFMT_VFS_V1)
{
set_errno (EINVAL);
return -1;
}
/*FALLTHRU*/
case Q_QUOTAOFF:
case Q_SETINFO:
access |= FILE_WRITE_DATA;
break;
case Q_GETFMT:
case Q_GETINFO:
break;
case Q_SETQUOTA:
access |= FILE_WRITE_DATA;
/*FALLTHRU*/
case Q_GETQUOTA:
/* Windows feature: Default limits. Get or set them with id == -1. */
if (id != -1)
{
struct passwd *pw = NULL;
struct group *gr = NULL;
if (type == USRQUOTA)
pw = internal_getpwuid (id);
else
gr = internal_getgrgid (id);
if (pw)
sid.getfrompw (pw);
else if (gr)
sid.getfromgr (gr);
else
{
set_errno (EINVAL);
return -1;
}
}
break;
default:
set_errno (EINVAL);
return -1;
}
/* Check path */
pc.check (special, PC_SYM_FOLLOW | PC_NOWARN, stat_suffixes);
if (pc.error)
{
set_errno (pc.error);
return -1;
}
if (!pc.exists ())
{
set_errno (ENOENT);
return -1;
}
if (!S_ISBLK (pc.dev.mode))
{
set_errno (ENOTBLK);
return -1;
}
pc.get_object_attr (attr, sec_none_nih);
/* For the following functions to work, we must attach the virtual path to
the quota file to the device path.
FIXME: Note that this is NTFS-specific. Adding ReFS in another step. */
tp.u_get (&path);
RtlCopyUnicodeString (&path, attr.ObjectName);
RtlAppendUnicodeToString (&path, L"\\$Extend\\$Quota:$Q:$INDEX_ALLOCATION");
attr.ObjectName = &path;
/* Open filesystem */
status = NtOpenFile (&fh, access, &attr, &io, FILE_SHARE_VALID_FLAGS, 0);
if (NT_SUCCESS (status))
switch (subcmd)
{
case Q_SYNC:
/* No sync, just report success. */
status = STATUS_SUCCESS;
break;
case Q_QUOTAON:
case Q_QUOTAOFF:
/* Ignore filename in addr. */
status = NtQueryVolumeInformationFile (fh, &io, &ffci, sizeof ffci,
FileFsControlInformation);
if (!NT_SUCCESS (status))
break;
ffci.FileSystemControlFlags &= ~FILE_VC_QUOTA_ENFORCE
& ~FILE_VC_QUOTA_TRACK
& ~FILE_VC_QUOTAS_INCOMPLETE
& ~FILE_VC_QUOTAS_REBUILDING;
if (subcmd == Q_QUOTAON)
ffci.FileSystemControlFlags |= FILE_VC_QUOTA_ENFORCE;
status = NtSetVolumeInformationFile (fh, &io, &ffci, sizeof ffci,
FileFsControlInformation);
break;
case Q_GETFMT:
__try
{
uint32_t *retval = (uint32_t *) addr;
/* Always fake the latest format. */
*retval = QFMT_VFS_V1;
}
__except (EFAULT)
{
ret = -1;
break;
}
__endtry
status = STATUS_SUCCESS;
break;
case Q_GETINFO:
__try
{
struct dqinfo *dqi = (struct dqinfo *) addr;
dqi->dqi_bgrace = dqi->dqi_igrace = UINT64_MAX;
dqi->dqi_flags = 0;
dqi->dqi_valid = IIF_BGRACE | IIF_IGRACE;
}
__except (EFAULT)
{
ret = -1;
break;
}
__endtry
status = STATUS_SUCCESS;
break;
case Q_SETINFO:
/* No settings possible, just report success. */
status = STATUS_SUCCESS;
break;
case Q_GETQUOTA:
/* Windows feature: Default limits. Get or set them with id == -1. */
if (id == -1)
{
status = NtQueryVolumeInformationFile (fh, &io, &ffci, sizeof ffci,
FileFsControlInformation);
if (!NT_SUCCESS (status))
break;
__try
{
struct dqblk *dq = (struct dqblk *) addr;
dq->dqb_bhardlimit = (uint64_t) ffci.DefaultQuotaLimit.QuadPart;
if (dq->dqb_bhardlimit != UINT64_MAX)
dq->dqb_bhardlimit /= BLOCK_SIZE;
dq->dqb_bsoftlimit =
(uint64_t) ffci.DefaultQuotaThreshold.QuadPart;
if (dq->dqb_bsoftlimit != UINT64_MAX)
dq->dqb_bsoftlimit /= BLOCK_SIZE;
dq->dqb_curspace = 0;
dq->dqb_ihardlimit = UINT64_MAX;
dq->dqb_isoftlimit = UINT64_MAX;
dq->dqb_curinodes = 0;
dq->dqb_btime = UINT64_MAX;
dq->dqb_itime = UINT64_MAX;
dq->dqb_valid = QIF_BLIMITS;
}
__except (EFAULT)
{
ret = -1;
break;
}
__endtry
}
else
{
PFILE_GET_QUOTA_INFORMATION pgqi = (PFILE_GET_QUOTA_INFORMATION)
alloca (PGQI_SIZE);
PFILE_QUOTA_INFORMATION pfqi = (PFILE_QUOTA_INFORMATION)
alloca (PFQI_SIZE);
pgqi->NextEntryOffset = 0;
pgqi->SidLength = RtlLengthSid (sid);
RtlCopySid (RtlLengthSid (sid), &pgqi->Sid, sid);
status = NtQueryQuotaInformationFile (fh, &io, pfqi, PFQI_SIZE,
TRUE, pgqi, PGQI_SIZE,
NULL, TRUE);
if (!NT_SUCCESS (status))
break;
__try
{
struct dqblk *dq = (struct dqblk *) addr;
dq->dqb_bhardlimit = (uint64_t) pfqi->QuotaLimit.QuadPart;
if (dq->dqb_bhardlimit != UINT64_MAX)
dq->dqb_bhardlimit /= BLOCK_SIZE;
dq->dqb_bsoftlimit = (uint64_t) pfqi->QuotaThreshold.QuadPart;
if (dq->dqb_bsoftlimit != UINT64_MAX)
dq->dqb_bsoftlimit /= BLOCK_SIZE;
dq->dqb_curspace = (uint64_t) pfqi->QuotaUsed.QuadPart;
if (dq->dqb_curspace != UINT64_MAX)
dq->dqb_curspace /= BLOCK_SIZE;
dq->dqb_ihardlimit = UINT64_MAX;
dq->dqb_isoftlimit = UINT64_MAX;
dq->dqb_curinodes = 0;
dq->dqb_btime = UINT64_MAX;
dq->dqb_itime = UINT64_MAX;
dq->dqb_valid = QIF_BLIMITS | QIF_SPACE;
}
__except (EFAULT)
{
ret = -1;
break;
}
__endtry
}
break;
case Q_SETQUOTA:
/* Windows feature: Default limits. Get or set them with id == -1. */
if (id == -1)
{
status = NtQueryVolumeInformationFile (fh, &io, &ffci, sizeof ffci,
FileFsControlInformation);
if (!NT_SUCCESS (status))
break;
__try
{
struct dqblk *dq = (struct dqblk *) addr;
if (!(dq->dqb_valid & QIF_BLIMITS))
break;
ffci.DefaultQuotaLimit.QuadPart = dq->dqb_bhardlimit;
if (ffci.DefaultQuotaLimit.QuadPart != -1)
ffci.DefaultQuotaLimit.QuadPart *= BLOCK_SIZE;
ffci.DefaultQuotaThreshold.QuadPart = dq->dqb_bsoftlimit;
if (ffci.DefaultQuotaThreshold.QuadPart != -1)
ffci.DefaultQuotaThreshold.QuadPart *= BLOCK_SIZE;
}
__except (EFAULT)
{
ret = -1;
break;
}
__endtry
status = NtSetVolumeInformationFile (fh, &io, &ffci, sizeof ffci,
FileFsControlInformation);
}
else
{
PFILE_GET_QUOTA_INFORMATION pgqi = (PFILE_GET_QUOTA_INFORMATION)
alloca (PGQI_SIZE);
PFILE_QUOTA_INFORMATION pfqi = (PFILE_QUOTA_INFORMATION)
alloca (PFQI_SIZE);
pgqi->NextEntryOffset = 0;
pgqi->SidLength = RtlLengthSid (sid);
RtlCopySid (RtlLengthSid (sid), &pgqi->Sid, sid);
status = NtQueryQuotaInformationFile (fh, &io, pfqi, PFQI_SIZE,
TRUE, pgqi, PGQI_SIZE,
NULL, TRUE);
if (!NT_SUCCESS (status))
break;
__try
{
struct dqblk *dq = (struct dqblk *) addr;
if (!(dq->dqb_valid & QIF_BLIMITS))
break;
pfqi->QuotaLimit.QuadPart = dq->dqb_bhardlimit;
if (pfqi->QuotaLimit.QuadPart != -1)
pfqi->QuotaLimit.QuadPart *= BLOCK_SIZE;
pfqi->QuotaThreshold.QuadPart = dq->dqb_bsoftlimit;
if (pfqi->QuotaThreshold.QuadPart != -1)
pfqi->QuotaThreshold.QuadPart *= BLOCK_SIZE;
}
__except (EFAULT)
{
ret = -1;
break;
}
__endtry
status = NtSetQuotaInformationFile (fh, &io, pfqi, PFQI_SIZE);
}
break;
}
if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
ret = -1;
}
return ret;
}
|
