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device: Internal error if writing 0 bytes to dev.

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This commit is contained in:
Alasdair G Kergon 2017-12-12 12:57:25 +00:00
parent 7272fd2210
commit c5ef76bf27
1 changed files with 5 additions and 0 deletions
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5
lib/device/dev-io.c
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@ -804,6 +804,11 @@ int dev_write(struct device *dev, uint64_t offset, size_t len, dev_io_reason_t r
if (!_dev_is_valid(dev))
return 0;
if (!len) {
log_error(INTERNAL_ERROR "Attempted to write 0 bytes to %s at " FMTu64, dev_name(dev), offset);
return 0;
}
where.dev = dev;
where.start = offset;
where.size = len;