On Fri, Jul 25, 2008 at 11:45 AM, tirumalareddy marri <tirumalareddymarri@xxxxxxxxx> wrote: > I am looking at async_xor() usage and found that if async_xor() returns null because of device->device_prep_dma_xor() <async_xor.c> failed to get slot. This might cause failure of stripe creation . Which would cause data corruption in RAID-5 at high data rates. > OR > Data integrity is guaranteed because ops_complete_write() will not be called in the event of device->device_prep_dma_xor() failed to get slot and returned NULL ? Hi Marri, ops_complete_write will be called regardless of whether NULL is returned. If async_xor returns NULL it simply indicates to the caller that the operation was completed synchronously. In current mainline async_xor will poll for a descriptor so the driver must take care to ensure forward progress. -- Dan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
