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XL/erasure-read: Support parallel reads from disks.

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This commit is contained in:
Krishna Srinivas
2016-06-22 03:04:11 +05:30
parent 78ae696749
commit 17efaaa902
3 changed files with 108 additions and 73 deletions
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16
erasure-utils.go
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@@ -89,16 +89,16 @@ func getDataBlocks(enBlocks [][]byte, dataBlocks int, curBlockSize int) (data []
}
// getBlockInfo - find start/end block and bytes to skip for given offset, length and block size.
func getBlockInfo(offset, length, blockSize int64) (startBlock, bytesToSkip, endBlock int64) {
func getBlockInfo(offset, blockSize int64) (startBlock, bytesToSkip int64) {
// Calculate start block for given offset and how many bytes to skip to get the offset.
startBlock = offset / blockSize
bytesToSkip = offset % blockSize
// Calculate end block for given size to read
endBlock = (offset + length) / blockSize
if endBlock > 0 && (offset+length)%blockSize == 0 {
endBlock--
}
return
}
// calculate the blockSize based on input length and total number of
// data blocks.
func getEncodedBlockLen(inputLen int64, dataBlocks int) (curEncBlockSize int64) {
curEncBlockSize = (inputLen + int64(dataBlocks) - 1) / int64(dataBlocks)
return curEncBlockSize
}