On Sun, May 23, 2010 at 04:31:52PM +0800, Shi Weihua wrote: > at 2010-5-22 1:03, Josef Bacik wrote: > > In order for AIO to work, we need to implement aio_write. This patch > > converts > > our btrfs_file_write to btrfs_aio_write. I've tested this with xfstests and > > nothing broke, and the AIO stuff magically started working. Thanks, > > But xfstests's case 198(source: src/aio-dio-regress/aiodio_sparse2.c) still > failed, > following message outputted. > -------------------- > AIO write offset 0 expected 65536 got -22 > AIO write offset 5242880 expected 65536 got -22 > AIO write offset 10485760 expected 65536 got -22 > AIO write offset 15728640 expected 65536 got -22 > AIO write offset 20971520 expected 65536 got -22 > AIO write offset 31457280 expected 65536 got -22 > AIO write offset 36700160 expected 65536 got -22 > AIO write offset 41943040 expected 65536 got -22 > AIO write offset 47185920 expected 65536 got -22 > AIO write offset 52428800 expected 65536 got -22 > AIO write offset 57671680 expected 65536 got -22 > AIO write offset 62914560 expected 65536 got -22 > AIO write offset 73400320 expected 65536 got -22 > AIO write offset 78643200 expected 65536 got -22 > non one buffer at buf[0] => 0x00,00,00,00 > non-one read at offset 0 > *** WARNING *** /tmp/aaaa has not been unlinked; if you don't rm it manually > first, it may influence the next run > -------------------- > > generic_file_direct_write()(in btrfs_file_aio_write(), fs/btrfs/file.c) > returned -22, > maybe it's useful for your analysing.
Yes, change that testcase to run -a 4096 and it will run fine. Because BTRFS doesn't pass in a bdev to __blockdev_direct_IO it doesn't do 512 byte aligned IO, just blocksize aligned IO. I will fix that at some later point, but its a little tricky since we have to figure out which bdev has the largest alignment (in case we have a 4k sector device and a 512 byte sector device in the same volume). Thanks, Josef -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
