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https://github.com/clearlinux/kvmtool.git
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Asias He
063e87a008
This patch also adds some comments to disk/blk.c Signed-off-by: Asias He <asias.hejun@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
40 lines
936 B
C
40 lines
936 B
C
#include "kvm/disk-image.h"
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/*
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* raw image and blk dev are similar, so reuse raw image ops.
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*/
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static struct disk_image_operations blk_dev_ops = {
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.read_sector = raw_image__read_sector,
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.write_sector = raw_image__write_sector,
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.close = raw_image__close,
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};
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struct disk_image *blkdev__probe(const char *filename, struct stat *st)
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{
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u64 size;
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int fd;
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if (!S_ISBLK(st->st_mode))
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return NULL;
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/*
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* Be careful! We are opening host block device!
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* Open it readonly since we do not want to break user's data on disk.
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*/
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return NULL;
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if (ioctl(fd, BLKGETSIZE64, &size) < 0) {
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close(fd);
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return NULL;
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}
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/*
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* FIXME: This will not work on 32-bit host because we can not
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* mmap large disk. There is not enough virtual address space
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* in 32-bit host. However, this works on 64-bit host.
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*/
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return disk_image__new(fd, size, &blk_dev_ops, DISK_IMAGE_MMAP);
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}
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