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https://github.com/xen-project/xen.git
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Shriram Rajagopalan
de869779a0
Move (page aligned) buffer allocations in {os}_privcmd_alloc_hypercall_buffer
into a global function xc_memalign. This API is also used by Remus
compression code to allocate compression caches that need to be page aligned.
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Brendan Cully <brendan@cs.ubc.ca>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
79 lines
2.0 KiB
C
79 lines
2.0 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xc_private.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 boundary 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 &= ~(XC_PAGE_SIZE-1);
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}
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/* Discard from the buffer cache. */
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if ( posix_fadvise64(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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int ret;
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void *ptr;
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ret = posix_memalign(&ptr, alignment, size);
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if (ret != 0 || !ptr)
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return NULL;
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return ptr;
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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-set-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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