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memfd: split qemu_memfd_alloc()

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Add a function to only create a memfd, without mmap. The function is
used in the following memory backend.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20171023141815.17709-2-marcandre.lureau@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-10-23 15:18:07 +01:00 • committed by Eduardo Habkost
parent 3e5bdc6573
commit dcff1035df
2 changed files with 37 additions and 25 deletions
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1
include/qemu/memfd.h
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@ -16,6 +16,7 @@
#define F_SEAL_WRITE 0x0008 /* prevent writes */
#endif
int qemu_memfd_create(const char *name, size_t size, unsigned int seals);
void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
int *fd);
void qemu_memfd_free(void *ptr, size_t size, int fd);