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transmission/libtransmission/file-capacity.cc

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// This file Copyright © Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm>
#include <cerrno>
#include <cstdint> // int64_t
#include <cstdio> // FILE
#include <optional>
#include <string>
#include <string_view>
#include <event2/util.h> /* evutil_ascii_strcasecmp() */
#ifndef _WIN32
#include <unistd.h> /* getuid() */
#include <sys/types.h> /* types needed by quota.h */
#if defined(__FreeBSD__) || defined(__OpenBSD__)
#include <ufs/ufs/quota.h> /* quotactl() */
#elif defined(__DragonFly__)
#include <vfs/ufs/quota.h> /* quotactl */
#elif defined(__NetBSD__)
#include <sys/param.h>
#ifndef statfs
#define statfs statvfs
#endif
#elif defined(__sun)
#include <sys/fs/ufs_quota.h> /* quotactl */
#else
#include <sys/quota.h> /* quotactl() */
#endif
#if !defined(btodb) && defined(QIF_DQBLKSIZE_BITS)
#define btodb(num) ((num) >> QIF_DQBLKSIZE_BITS)
#endif
#ifdef HAVE_GETMNTENT
#ifdef __sun
#include <fcntl.h>
#include <stdio.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#define _PATH_MOUNTED MNTTAB
#else
#include <mntent.h>
#include <paths.h> /* _PATH_MOUNTED */
#endif
#else /* BSD derived systems */
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#endif
#endif
#ifdef __APPLE__
#ifndef HAVE_SYS_STATVFS_H
#define HAVE_SYS_STATVFS_H
#endif
#ifndef HAVE_STATVFS
#define HAVE_STATVFS
#endif
#endif
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#ifdef HAVE_XFS_XFS_H
#define HAVE_XQM
#include <xfs/xqm.h>
#endif
#include "libtransmission/error.h"
#include "libtransmission/file.h"
#include "libtransmission/tr-macros.h"
#include "libtransmission/utils.h" // tr_win32_utf8_to_native
namespace
{
struct tr_device_info
{
std::string path;
std::string device;
std::string fstype;
};
#ifndef _WIN32
[[nodiscard]] char const* getdev(std::string_view path)
{
#ifdef HAVE_GETMNTENT
#ifdef __sun
FILE* const fp = fopen(_PATH_MOUNTED, "r");
if (fp == nullptr)
{
return nullptr;
}
struct mnttab mnt;
while (getmntent(fp, &mnt) != -1)
{
if (mnt.mnt_mountp != nullptr && path == mnt.mnt_mountp)
{
break;
}
}
fclose(fp);
return mnt.mnt_special;
#else
FILE* const fp = setmntent(_PATH_MOUNTED, "r");
if (fp == nullptr)
{
return nullptr;
}
struct mntent const* mnt = nullptr;
while ((mnt = getmntent(fp)) != nullptr)
{
if (mnt->mnt_dir != nullptr && path == mnt->mnt_dir)
{
break;
}
}
endmntent(fp);
return mnt != nullptr ? mnt->mnt_fsname : nullptr;
#endif
#else /* BSD derived systems */
struct statfs* mnt = nullptr;
int const n = getmntinfo(&mnt, MNT_WAIT);
if (n == 0)
{
return nullptr;
}
for (int i = 0; i < n; i++)
{
if (path == mnt[i].f_mntonname)
{
return mnt[i].f_mntfromname;
}
}
return nullptr;
#endif
}
[[nodiscard]] char const* getfstype(std::string_view device)
{
#ifdef HAVE_GETMNTENT
#ifdef __sun
FILE* const fp = fopen(_PATH_MOUNTED, "r");
if (fp == nullptr)
{
return nullptr;
}
struct mnttab mnt;
while (getmntent(fp, &mnt) != -1)
{
if (device == mnt.mnt_mountp)
{
break;
}
}
fclose(fp);
return mnt.mnt_fstype;
#else
FILE* const fp = setmntent(_PATH_MOUNTED, "r");
if (fp == nullptr)
{
return nullptr;
}
struct mntent const* mnt = nullptr;
while ((mnt = getmntent(fp)) != nullptr)
{
if (device == mnt->mnt_fsname)
{
break;
}
}
endmntent(fp);
return mnt != nullptr ? mnt->mnt_type : nullptr;
#endif
#else /* BSD derived systems */
struct statfs* mnt = nullptr;
int const n = getmntinfo(&mnt, MNT_WAIT);
if (n == 0)
{
return nullptr;
}
for (int i = 0; i < n; i++)
{
if (device == mnt[i].f_mntfromname)
{
return mnt[i].f_fstypename;
}
}
return nullptr;
#endif
}
std::string getblkdev(std::string_view path)
{
for (;;)
{
if (auto const* const device = getdev(path); device != nullptr)
{
return device;
}
auto const pos = path.rfind('/');
if (pos == std::string_view::npos)
{
return {};
}
path = path.substr(0, pos);
}
}
#if defined(__NetBSD__) && __NetBSD_Version__ >= 600000000
extern "C"
{
#include <quota.h>
}
[[nodiscard]] tr_sys_path_capacity getquota(char const* device)
{
struct quotahandle* qh;
struct quotakey qk;
struct quotaval qv;
struct tr_sys_path_capacity disk_space = { -1, -1 };
qh = quota_open(device);
if (qh == nullptr)
{
return disk_space;
}
qk.qk_idtype = QUOTA_IDTYPE_USER;
qk.qk_id = getuid();
qk.qk_objtype = QUOTA_OBJTYPE_BLOCKS;
if (quota_get(qh, &qk, &qv) == -1)
{
quota_close(qh);
return disk_space;
}
int64_t limit;
if (qv.qv_softlimit > 0)
{
limit = qv.qv_softlimit;
}
else if (qv.qv_hardlimit > 0)
{
limit = qv.qv_hardlimit;
}
else
{
quota_close(qh);
return disk_space;
}
int64_t const spaceused = qv.qv_usage;
quota_close(qh);
int64_t const freespace = limit - spaceused;
disk_space.free = freespace < 0 ? 0 : freespace;
disk_space.total = limit;
return disk_space;
}
#else
[[nodiscard]] tr_sys_path_capacity getquota(char const* device)
{
#if defined(__DragonFly__)
struct ufs_dqblk dq = {};
#else
struct dqblk dq = {};
#endif
auto disk_space = tr_sys_path_capacity{ -1, -1 };
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
if (quotactl(device, QCMD(Q_GETQUOTA, USRQUOTA), getuid(), (caddr_t)&dq) != 0)
{
return disk_space;
}
#elif defined(__sun)
struct quotctl op;
int fd = open(device, O_RDONLY);
if (fd < 0)
{
return disk_space;
}
op.op = Q_GETQUOTA;
op.uid = getuid();
op.addr = (caddr_t)&dq;
if (ioctl(fd, Q_QUOTACTL, &op) != 0)
{
close(fd);
return disk_space;
}
close(fd);
#else
if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), device, getuid(), reinterpret_cast<caddr_t>(&dq)) != 0)
{
return disk_space;
}
#endif
int64_t limit = 0;
if (dq.dqb_bsoftlimit > 0)
{
/* Use soft limit first */
limit = dq.dqb_bsoftlimit;
}
else if (dq.dqb_bhardlimit > 0)
{
limit = dq.dqb_bhardlimit;
}
else
{
/* No quota enabled for this user */
return disk_space;
}
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
int64_t const spaceused = (int64_t)dq.dqb_curblocks >> 1;
#elif defined(__APPLE__)
int64_t const spaceused = (int64_t)dq.dqb_curbytes;
#elif defined(__UCLIBC__) && !TR_UCLIBC_CHECK_VERSION(1, 0, 18)
int64_t const spaceused = (int64_t)btodb(dq.dqb_curblocks);
#elif defined(__sun) || (defined(_LINUX_QUOTA_VERSION) && _LINUX_QUOTA_VERSION < 2)
int64_t const spaceused = (int64_t)dq.dqb_curblocks >> 1;
#else
int64_t const spaceused = btodb(dq.dqb_curspace);
#endif
int64_t const freespace = limit - spaceused;
#ifdef __APPLE__
disk_space.free = std::max(int64_t{ 0 }, freespace);
disk_space.total = std::max(int64_t{ 0 }, limit);
return disk_space;
#else
disk_space.free = std::max(int64_t{ 0 }, freespace * 1024);
disk_space.total = std::max(int64_t{ 0 }, limit * 1024);
return disk_space;
#endif
}
#endif
#ifdef HAVE_XQM
[[nodiscard]] tr_sys_path_capacity getxfsquota(char const* device)
{
struct tr_sys_path_capacity disk_space = { -1, -1 };
struct fs_disk_quota dq;
if (quotactl(QCMD(Q_XGETQUOTA, USRQUOTA), device, getuid(), (caddr_t)&dq) == 0)
{
int64_t limit = 0;
if (dq.d_blk_softlimit > 0)
{
/* Use soft limit first */
limit = dq.d_blk_softlimit >> 1;
}
else if (dq.d_blk_hardlimit > 0)
{
limit = dq.d_blk_hardlimit >> 1;
}
else
{
/* No quota enabled for this user */
return disk_space;
}
int64_t freespace = limit - (dq.d_bcount >> 1);
freespace = freespace < 0 ? 0 : (freespace * 1024);
limit = limit * 1024;
disk_space.free = freespace;
disk_space.total = limit;
return disk_space;
}
/* something went wrong */
return disk_space;
}
#endif /* HAVE_XQM */
#endif /* _WIN32 */
[[nodiscard]] tr_sys_path_capacity get_quota_space([[maybe_unused]] tr_device_info const& info)
{
struct tr_sys_path_capacity ret = { -1, -1 };
#ifndef _WIN32
if (evutil_ascii_strcasecmp(info.fstype.c_str(), "xfs") == 0)
{
#ifdef HAVE_XQM
ret = getxfsquota(info.device.c_str());
#endif
}
else
{
ret = getquota(info.device.c_str());
}
#endif /* _WIN32 */
return ret;
}
[[nodiscard]] tr_sys_path_capacity getDiskSpace(char const* path)
{
#ifdef _WIN32
struct tr_sys_path_capacity ret = { -1, -1 };
if (auto const wide_path = tr_win32_utf8_to_native(path); !std::empty(wide_path))
{
ULARGE_INTEGER freeBytesAvailable;
ULARGE_INTEGER totalBytesAvailable;
if (GetDiskFreeSpaceExW(wide_path.c_str(), &freeBytesAvailable, &totalBytesAvailable, nullptr))
{
ret.free = freeBytesAvailable.QuadPart;
ret.total = totalBytesAvailable.QuadPart;
}
}
return ret;
#elif defined(HAVE_STATVFS)
struct statvfs buf = {};
return statvfs(path, &buf) != 0 ? (struct tr_sys_path_capacity){ -1, -1 } :
(struct tr_sys_path_capacity){ (int64_t)buf.f_bavail * (int64_t)buf.f_frsize,
(int64_t)buf.f_blocks * (int64_t)buf.f_frsize };
#else
#warning FIXME: not implemented
return { -1, -1 };
#endif
}
tr_device_info tr_device_info_create(std::string_view path)
{
auto out = tr_device_info{};
out.path = path;
#ifndef _WIN32
out.device = getblkdev(out.path);
auto const* const fstype = getfstype(out.path);
out.fstype = fstype != nullptr ? fstype : "";
#endif
return out;
}
tr_sys_path_capacity tr_device_info_get_disk_space(struct tr_device_info const& info)
{
if (std::empty(info.path))
{
errno = EINVAL;
return { -1, -1 };
}
auto space = get_quota_space(info);
if (space.free < 0 || space.total < 0)
{
space = getDiskSpace(info.path.c_str());
}
return space;
}
} // namespace
std::optional<tr_sys_path_capacity> tr_sys_path_get_capacity(std::string_view path, tr_error* error)
{
auto local_error = tr_error{};
if (error == nullptr)
{
error = &local_error;
}
auto const info = tr_sys_path_get_info(path, 0, &local_error);
if (!info)
{
return {};
}
if (!info->isFolder())
{
error->set_from_errno(ENOTDIR);
return {};
}
auto const device = tr_device_info_create(path);
auto capacity = tr_device_info_get_disk_space(device);
if (capacity.free < 0 || capacity.total < 0)
{
error->set_from_errno(EINVAL);
return {};
}
return capacity;
}
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