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由 Tomoki Sekiyama 提交于
To use the online disk snapshot for online-backup, application-level consistency of the snapshot image is required. However, currently the guest agent can provide only filesystem-level consistency, and the snapshot may contain dirty data, for example, incomplete transactions. This patch provides the opportunity to quiesce applications before snapshot is taken. If --fsfreeze-hook option is specified, the hook is executed with "freeze" argument before the filesystem is frozen by fsfreeze-freeze command. As for fsfreeze-thaw command, the hook is executed with "thaw" argument after the filesystem is thawed. This patch depends on patchset to improve error reporting by Luiz Capitulino: http://lists.gnu.org/archive/html/qemu-devel/2012-11/msg03016.htmlSigned-off-by: NTomoki Sekiyama <tomoki.sekiyama.qu@hitachi.com> Reviewed-by: NLuiz Capitulino <lcapitulino@redhat.com> *clarified usage in help output Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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