Chunyan Liu a9fd30e633 storagevol: add nocow to vol xml ... Add 'nocow' to storage volume xml so that user can have an option to set NOCOW flag to the newly created volume. It's useful on btrfs file system to enhance performance. Btrfs has low performance when hosting VM images, even more when the guest in those VM are also using btrfs as file system. One way to mitigate this bad performance is to turn off COW attributes on VM files. Generally, there are two ways to turn off COW on btrfs: a) by mounting fs with nodatacow, then all newly created files will be NOCOW. b) per file. Add the NOCOW file attribute. It could only be done to empty or new files. This patch tries the second way, according to 'nocow' option, it could set NOCOW flag per file: for raw file images, handle 'nocow' in libvirt code; for non-raw file images, pass 'nocow=on' option to qemu-img, and let qemu-img to handle that (requires qemu-img version >= 2.1). Signed-off-by: Chunyan Liu <cyliu@suse.com>		2014-07-16 13:35:20 +02:00
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basictypes.rng	virInterface: Expose link state & speed	2014-06-11 09:13:32 +02:00
capability.rng	virCaps: expose pages info	2014-06-19 15:10:49 +02:00
domain.rng
domaincaps.rng	Introduce domain_capabilities	2014-07-03 12:22:37 +02:00
domaincommon.rng	qemu: Add cmd_per_lun, max_sectors to virtio-scsi	2014-07-02 09:43:17 +02:00
domainsnapshot.rng	conf: split <disk> schema into more pieces	2014-04-16 10:45:55 +02:00
interface.rng	interface: report link state for bonds and vlans too	2014-06-20 11:43:19 +03:00
Makefile.am	Introduce domain_capabilities	2014-07-03 12:22:37 +02:00
network.rng	Add forwarder attribute to <dns/> element	2013-09-17 17:47:33 -06:00
networkcommon.rng
nodedev.rng	nodedev: Introduce <pci-express/> to PCI devices	2014-06-16 17:40:49 +02:00
nwfilter.rng
secret.rng
storagecommon.rng
storagepool.rng
storagevol.rng	storagevol: add nocow to vol xml	2014-07-16 13:35:20 +02:00