fa45f8dab9
This new helper fetches file system type for a fd. Only Linux is implemented so far. Currently only tmpfs and hugetlbfs are defined, but it can grow as needed. Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
#ifndef QEMU_MMAP_ALLOC_H
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#define QEMU_MMAP_ALLOC_H
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typedef enum {
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QEMU_FS_TYPE_UNKNOWN = 0,
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QEMU_FS_TYPE_TMPFS,
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QEMU_FS_TYPE_HUGETLBFS,
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QEMU_FS_TYPE_NUM,
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} QemuFsType;
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size_t qemu_fd_getpagesize(int fd);
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QemuFsType qemu_fd_getfs(int fd);
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/**
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* qemu_ram_mmap: mmap anonymous memory, the specified file or device.
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*
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* mmap() abstraction to map guest RAM, simplifying flag handling, taking
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* care of alignment requirements and installing guard pages.
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*
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* Parameters:
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* @fd: the file or the device to mmap
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* @size: the number of bytes to be mmaped
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* @align: if not zero, specify the alignment of the starting mapping address;
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* otherwise, the alignment in use will be determined by QEMU.
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* @qemu_map_flags: QEMU_MAP_* flags
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* @map_offset: map starts at offset of map_offset from the start of fd
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*
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* Internally, MAP_PRIVATE, MAP_ANONYMOUS and MAP_SHARED_VALIDATE are set
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* implicitly based on other parameters.
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*
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* Return:
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* On success, return a pointer to the mapped area.
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* On failure, return MAP_FAILED.
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*/
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void *qemu_ram_mmap(int fd,
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size_t size,
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size_t align,
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uint32_t qemu_map_flags,
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off_t map_offset);
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void qemu_ram_munmap(int fd, void *ptr, size_t size);
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/*
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* Abstraction of PROT_ and MAP_ flags as passed to mmap(), for example,
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* consumed by qemu_ram_mmap().
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*/
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/* Map PROT_READ instead of PROT_READ | PROT_WRITE. */
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#define QEMU_MAP_READONLY (1 << 0)
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/* Use MAP_SHARED instead of MAP_PRIVATE. */
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#define QEMU_MAP_SHARED (1 << 1)
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/*
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* Use MAP_SYNC | MAP_SHARED_VALIDATE if supported. Ignored without
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* QEMU_MAP_SHARED. If mapping fails, warn and fallback to !QEMU_MAP_SYNC.
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*/
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#define QEMU_MAP_SYNC (1 << 2)
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/*
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* Use MAP_NORESERVE to skip reservation of swap space (or huge pages if
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* applicable). Bail out if not supported/effective.
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*/
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#define QEMU_MAP_NORESERVE (1 << 3)
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#endif
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