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Merge #15650: Handle the result of posix_fallocate system call

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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 5d35ae3326
  sipa:
    utACK 5d35ae3326, though the Yoda condition is an uncommon style in this project.
  hebasto:
    utACK 5d35ae3326
  practicalswift:
    utACK 5d35ae3326

Tree-SHA512: 7ab3b35fb633926f28a58b2b07ffde8e31bb997c80a716b1b45ee716fe9ff4ddcef0a05810bd4423530e220cfc62f8925517d27a8b92b05a524272063e43f746
This commit is contained in:
MarcoFalke 2019-05-02 08:43:54 -04:00
parent 0936f35f65 5d35ae3326
commit c4560a7dfe
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1 changed files with 4 additions and 3 deletions
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7
src/util/system.cpp
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@ -1085,11 +1085,12 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
fcntl(fileno(file), F_PREALLOCATE, &fst);
}
ftruncate(fileno(file), fst.fst_length);
#elif defined(__linux__)
#else
#if defined(__linux__)
// Version using posix_fallocate
off_t nEndPos = (off_t)offset + length;
posix_fallocate(fileno(file), 0, nEndPos);
#else
if (0 == posix_fallocate(fileno(file), 0, nEndPos)) return;
#endif
// Fallback version
// TODO: just write one byte per block
static const char buf[65536] = {};