c5b2a9e078
Linux commit 749df87bd7bee5a79cef073f5d032ddb2b211de8 (v4.14-rc1) added a new flag MFD_HUGETLB to memfd_create() that specify the file to be created resides in the hugetlbfs filesystem. This is the generic hugetlbfs filesystem not associated with any specific mount point. hugetlbfs does not support sealing operations in v4.14, therefore specifying MFD_ALLOW_SEALING with MFD_HUGETLB will result in EINVAL. However, I added sealing support in "[PATCH v3 0/9] memfd: add sealing to hugetlb-backed memory" series, queued in -mm tree for v4.16. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180201132757.23063-3-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
27 lines
856 B
C
27 lines
856 B
C
#ifndef QEMU_MEMFD_H
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#define QEMU_MEMFD_H
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#ifndef F_LINUX_SPECIFIC_BASE
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#define F_LINUX_SPECIFIC_BASE 1024
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#endif
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#ifndef F_ADD_SEALS
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#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
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#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
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#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
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#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
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#define F_SEAL_GROW 0x0004 /* prevent file from growing */
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#define F_SEAL_WRITE 0x0008 /* prevent writes */
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#endif
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int qemu_memfd_create(const char *name, size_t size, bool hugetlb,
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unsigned int seals, Error **errp);
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void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
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int *fd, Error **errp);
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void qemu_memfd_free(void *ptr, size_t size, int fd);
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bool qemu_memfd_check(void);
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#endif /* QEMU_MEMFD_H */
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