File indexing completed on 2024-04-14 03:49:41
0001 /* 0002 SPDX-FileCopyrightText: 2010 Tobias Koenig <tokoe@kde.org> 0003 SPDX-FileCopyrightText: 2014 Daniel Vrátil <dvratil@redhat.com> 0004 SPDX-FileCopyrightText: 2015 Vishesh Handa <vhanda@kde.org> 0005 0006 SPDX-License-Identifier: LGPL-2.0-or-later 0007 */ 0008 0009 #include "fsutils.h" 0010 #include "enginedebug.h" 0011 0012 #ifdef Q_OS_LINUX 0013 #include <cerrno> 0014 #include <unistd.h> 0015 #include <sys/ioctl.h> 0016 #include <fcntl.h> 0017 #endif 0018 0019 using namespace Baloo; 0020 0021 void FSUtils::disableCoW(const QString &path) 0022 { 0023 #ifndef Q_OS_LINUX 0024 Q_UNUSED(path); 0025 #else 0026 // from linux/fs.h, so that Baloo does not depend on Linux header files 0027 #ifndef FS_IOC_GETFLAGS 0028 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 0029 #endif 0030 #ifndef FS_IOC_SETFLAGS 0031 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 0032 #endif 0033 0034 // Disable COW on file 0035 #ifndef FS_NOCOW_FL 0036 #define FS_NOCOW_FL 0x00800000 0037 #endif 0038 0039 ulong flags = 0; 0040 const int fd = open(qPrintable(path), O_RDONLY); 0041 if (fd == -1) { 0042 qCWarning(ENGINE) << "Failed to open" << path << "to modify flags (" << errno << ")"; 0043 return; 0044 } 0045 0046 if (ioctl(fd, FS_IOC_GETFLAGS, &flags) == -1) { 0047 const int errno_ioctl = errno; 0048 // ignore ENOTTY, filesystem does not support attrs (and likely neither supports COW) 0049 if (errno_ioctl != ENOTTY) { 0050 qCWarning(ENGINE) << "ioctl error: failed to get file flags (" << errno_ioctl << ")"; 0051 } 0052 close(fd); 0053 return; 0054 } 0055 if (!(flags & FS_NOCOW_FL)) { 0056 flags |= FS_NOCOW_FL; 0057 if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == -1) { 0058 const int errno_ioctl = errno; 0059 // ignore EOPNOTSUPP, returned on filesystems not supporting COW 0060 if (errno_ioctl != EOPNOTSUPP) { 0061 qCWarning(ENGINE) << "ioctl error: failed to set file flags (" << errno_ioctl << ")"; 0062 } 0063 close(fd); 0064 return; 0065 } 0066 } 0067 close(fd); 0068 #endif 0069 }