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Merge #15650: Handle the result of posix_fallocate system call
5d35ae3326 Handle the result of posix_fallocate system call (Luca Venturini) Pull request description: The system call `posix_fallocate` is not supported on some filesystems. - catches the result of posix_allocate and fall back to the default behaviour if the return value is different from 0 (success) Fixes #15624 ACKs for commit 5d35ae: MarcoFalke: utACK 5d35ae3326624da3fe5dcb4047c9a7cec6665cab sipa: utACK 5d35ae3326624da3fe5dcb4047c9a7cec6665cab, though the Yoda condition is an uncommon style in this project. hebasto: utACK 5d35ae3326624da3fe5dcb4047c9a7cec6665cab practicalswift: utACK 5d35ae3326624da3fe5dcb4047c9a7cec6665cab Tree-SHA512: 7ab3b35fb633926f28a58b2b07ffde8e31bb997c80a716b1b45ee716fe9ff4ddcef0a05810bd4423530e220cfc62f8925517d27a8b92b05a524272063e43f746
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@ -1164,11 +1164,12 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
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fcntl(fileno(file), F_PREALLOCATE, &fst);
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}
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ftruncate(fileno(file), fst.fst_length);
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#elif defined(__linux__)
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#else
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#if defined(__linux__)
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// Version using posix_fallocate
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off_t nEndPos = (off_t)offset + length;
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posix_fallocate(fileno(file), 0, nEndPos);
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#else
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if (0 == posix_fallocate(fileno(file), 0, nEndPos)) return;
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#endif
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// Fallback version
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// TODO: just write one byte per block
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static const char buf[65536] = {};
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