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[Qemu-devel] [PATCH V2 3/4] qemu-nbd: add doc for internal snapshot expo
From: |
Wenchao Xia |
Subject: |
[Qemu-devel] [PATCH V2 3/4] qemu-nbd: add doc for internal snapshot export |
Date: |
Sun, 22 Sep 2013 17:39:50 +0800 |
Signed-off-by: Wenchao Xia <address@hidden>
---
qemu-nbd.c | 8 +++++++-
qemu-nbd.texi | 8 +++++++-
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index e450d04..8cb4bf1 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -80,7 +80,13 @@ static void usage(const char *name)
"\n"
"Block device options:\n"
" -r, --read-only export read-only\n"
-" -s, --snapshot use snapshot file\n"
+" -s, --snapshot use FILE as an external snapshot, create a temporary\n"
+" file with backing_file=FILE, redirect the write to\n"
+" the temporary one\n"
+" -l, --snapshot-load=PARAM\n"
+" load an internal snapshot inside FILE and export it\n"
+" as an read-only device, PARAM format is\n"
+" 'id=[ID],name=[NAME]'\n"
" -n, --nocache disable host cache\n"
" --cache=MODE set cache mode (none, writeback, ...)\n"
#ifdef CONFIG_LINUX_AIO
diff --git a/qemu-nbd.texi b/qemu-nbd.texi
index 6055ec6..69e9e9a 100644
--- a/qemu-nbd.texi
+++ b/qemu-nbd.texi
@@ -27,7 +27,13 @@ Export QEMU disk image using NBD protocol.
@item -P, address@hidden
only expose partition @var{num}
@item -s, --snapshot
- use snapshot file
+ use @var{filename} as an external snapshot, create a temporary
+ file with address@hidden, redirect the write to
+ the temporary one
address@hidden -l, address@hidden
+ load an internal snapshot inside @var{filename} and export it
+ as an read-only device, @var{param} format is
+ 'id=[ID],name=[NAME]'
@item -n, --nocache
@itemx address@hidden
set cache mode to be used with the file. See the documentation of
--
1.7.1