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Simplification to the posix_fallocate() replacement used for the

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SQLITE_FCNTL_SIZE_HINT file control in the unix VFS.

FossilOrigin-Name: 74934d3f60ad9f6550297410eada0f288e0123c4
This commit is contained in:
drh
2015-12-01 22:09:42 +00:00
parent 41d2e66ef3
commit 053378dfa8
3 changed files with 10 additions and 14 deletions
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10
src/os_unix.c
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@@ -3662,18 +3662,14 @@ static int fcntlSizeHint(unixFile *pFile, i64 nByte){
int nWrite = 0; /* Number of bytes written by seekAndWrite */
i64 iWrite; /* Next offset to write to */
iWrite = ((buf.st_size + 2*nBlk - 1)/nBlk)*nBlk-1;
iWrite = (buf.st_size/nBlk)*nBlk + nBlk - 1;
assert( iWrite>=buf.st_size );
assert( (iWrite/nBlk)==((buf.st_size+nBlk-1)/nBlk) );
assert( ((iWrite+1)%nBlk)==0 );
for(/*no-op*/; iWrite<nSize; iWrite+=nBlk ){
for(/*no-op*/; iWrite<nSize+nBlk-1; iWrite+=nBlk ){
if( iWrite>=nSize ) iWrite = nSize - 1;
nWrite = seekAndWrite(pFile, iWrite, "", 1);
if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
}
if( nWrite==0 || (nSize%nBlk) ){
nWrite = seekAndWrite(pFile, nSize-1, "", 1);
if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
}
#endif
}
}