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