um: Use fdatasync() when mapping the UBD FSYNC command
We do not need to update the metadata (atime, mtime, etc) on the UBD file and/or the COW file until UML exits. UBD image mtime is checked in UML only when opening the files. After that they are locked and used exclusively by a single UML instance, so there is no point wasting resources on updating metadata on every sync. We can sync data only. The host will always update mtime if a file has been modified upon closing it. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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@ -290,7 +290,7 @@ int os_write_file(int fd, const void *buf, int len)
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int os_sync_file(int fd)
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int os_sync_file(int fd)
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{
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{
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int n = fsync(fd);
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int n = fdatasync(fd);
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if (n < 0)
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if (n < 0)
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return -errno;
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return -errno;
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