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https://github.com/xen-project/xen.git
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Ian Campbell
3248691679
libxenforeignmemory will provide a stable API and ABI for mapping foreign domain memory (subject to appropriate privileges). The new library exposes an interface equivalent to xc_map_foreign_memory_bulk, which all the other xc_map_foreign_memory_* functions (which remain in libxc) are implemented in terms of. Upon request (via #define XC_WANT_COMPAT_MAP_FOREIGN_API) libxenctrl will provide a compat API for the old names. This is used by qemu-xen and qemu-trad as well as various in tree things (which required de-dupping various #includes in some too to get the #define before the first). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> [ ijc -- updated MINIOS_UPSTREAM_REVISION and QEMU_TRADITIONAL_REVISION ]
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/******************************************************************************
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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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;
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* version 2.1 of the License.
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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 <http://www.gnu.org/licenses/>.
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*/
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#include "xc_private.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <malloc.h>
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/* Optionally flush file to disk and discard page cache */
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void discard_file_cache(xc_interface *xch, int fd, int flush)
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{
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off_t cur = 0;
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int saved_errno = errno;
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if ( flush && (fsync(fd) < 0) )
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{
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/*PERROR("Failed to flush file: %s", strerror(errno));*/
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goto out;
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}
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/*
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* Calculate last page boundry of amount written so far
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* unless we are flushing in which case entire cache
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* is discarded.
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*/
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if ( !flush )
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{
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if ( ( cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
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cur = 0;
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cur &= ~(PAGE_SIZE - 1);
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}
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/* Discard from the buffer cache. */
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if ( posix_fadvise(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
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{
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/*PERROR("Failed to discard cache: %s", strerror(errno));*/
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goto out;
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}
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out:
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errno = saved_errno;
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}
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void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
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{
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return valloc(size);
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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