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f5b4c14155
virStorageBackendVolDownloadLocal and virStorageBackendVolUploadLocal use virFDStreamOpenFile function to work with the volume fd. virFDStreamOpenFile calls virFDStreamOpenFileInternal that implements handling of the non-blocking I/O. If a file is not a character device and not a fifo, it uses libvirt_iohelper. On FreeBSD, it doesn't work as expected because disk devices (including ZFS volumes) are exposed as character devices, and ZFS volumes do not support open(2) with O_NONBLOCK. To overcome this, introduce a forceIOHelper flag to virFDStreamOpenFileInternal that forces using libvirt_iohelper. And introduce virFDStreamOpenBlockDevice that calls virFDStreamOpenFileInternal with the forceIOHelper set to true.
70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
/*
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* fdstream.h: generic streams impl for file descriptors
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*
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* Copyright (C) 2009-2012 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __VIR_FDSTREAM_H_
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# define __VIR_FDSTREAM_H_
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# include "internal.h"
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# include "vircommand.h"
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/* internal callback, the generic one is used up by daemon stream driver */
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/* the close callback is called with fdstream private data locked */
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typedef void (*virFDStreamInternalCloseCb)(virStreamPtr st, void *opaque);
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typedef void (*virFDStreamInternalCloseCbFreeOpaque)(void *opaque);
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int virFDStreamOpen(virStreamPtr st,
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int fd);
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int virFDStreamConnectUNIX(virStreamPtr st,
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const char *path,
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bool abstract);
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int virFDStreamOpenFile(virStreamPtr st,
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const char *path,
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unsigned long long offset,
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unsigned long long length,
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int oflags);
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int virFDStreamCreateFile(virStreamPtr st,
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const char *path,
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unsigned long long offset,
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unsigned long long length,
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int oflags,
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mode_t mode);
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int virFDStreamOpenPTY(virStreamPtr st,
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const char *path,
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unsigned long long offset,
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unsigned long long length,
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int oflags);
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int virFDStreamOpenBlockDevice(virStreamPtr st,
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const char *path,
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unsigned long long offset,
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unsigned long long length,
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int oflags);
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int virFDStreamSetInternalCloseCb(virStreamPtr st,
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virFDStreamInternalCloseCb cb,
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void *opaque,
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virFDStreamInternalCloseCbFreeOpaque fcb);
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#endif /* __VIR_FDSTREAM_H_ */
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