Lennart Poettering
c4e7a0fdfe
blockdev_zero_out() overwrites a byte range of a block device (or a regular file, e.g. a disk image) with zeroes. On block devices we try to let the kernel do the work via BLKZEROOUT, which it might be able to offload to the device. That ioctl operates on whole sectors only however, hence incomplete sectors at the beginning and the end of the range are filled with explicit zeroes, and only the aligned middle part is handed to the ioctl. If that fails, explicit zeroes are written for that part too. On regular files a hole is punched instead (which reads back as zeroes and keeps the file sparse), falling back to explicit zeroes if the file system doesn't support that. (cherry picked from commit eb98b03118f27f33d3834ef8322f38391eb2c238)
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