2f15b6253af8d44bc63ce232ae236fdfb3528795
Apparently FAT on some recent kernels can't do RENAME_NOREPLACE, and of course cannot do linkat()/unlinkat() either (as the hard link concept does not exist on FAT). Add a fallback using an explicit beforehand faccessat() check. This sucks, but what we can do if the safe operations are not available? Fixes: #10063
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