On 07/19/2010 05:08 PM, Laine Stump wrote: > Originally the storage volume files were opened with O_DSYNC to make > sure they were flushed to disk immediately. It turned out that this > was extremely slow in some cases, so the O_DSYNC was removed in favor > of just calling fsync() after all the data had been written. However, > this call to fsync was inside the block that is executed to zero-fill > the end of the volume file. In cases where the new volume is copied > from an old volume, and they are the same length, this fsync would > never take place. > > Now the fsync is *always* done, unless there is an error (in which > case it isn't important, and is most likely inappropriate. ACK. -- Eric Blake eblake@xxxxxxxxxx +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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