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File.CopyTo: try to pre-allocate disk space for large destination files #61676

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adamsitnik wants to merge 3 commits into from
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File.CopyTo: try to pre-allocate disk space for large destination files #61676

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3a27e9f
File.Copy: try to pre-allocate disk space for large destination files
adamsitnik Nov 16, 2021
1a1f53e
Update src/libraries/Native/Unix/System.Native/pal_io.c
adamsitnik Nov 17, 2021
2d6f1a0
Merge remote-tracking branch 'upstream/main' into fileCopyUsePrealloc…
adamsitnik Jan 31, 2022
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9 changes: 9 additions & 0 deletions src/native/libs/System.Native/pal_io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1259,6 +1259,15 @@ int32_t SystemNative_CopyFile(intptr_t sourceFd, intptr_t destinationFd, int64_t
copied = sourceLength == 0;
}
#endif

#if HAVE_FALLOCATE // Linux
if (!copied && sourceLength > 81920) // BufferSize used by CopyFile_ReadWrite (would require more than 1 sys-call)
{
// try to pre-allocate disk space for large destination files
while ((ret = fallocate(outFd, FALLOC_FL_KEEP_SIZE, (off_t)0, (off_t)sourceLength)) == -1 && errno == EINTR);
}
#endif

#if HAVE_SENDFILE_4
// Try copying the data using sendfile.
if (trySendFile && !copied && sourceLength != 0)
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