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[Qemu-devel] [PATCH V3 3/7] qemu-nbd: add doc for internal snapshot expo
From: |
Wenchao Xia |
Subject: |
[Qemu-devel] [PATCH V3 3/7] qemu-nbd: add doc for internal snapshot export |
Date: |
Thu, 26 Sep 2013 08:16:04 +0800 |
Signed-off-by: Wenchao Xia <address@hidden>
---
qemu-nbd.c | 11 ++++++++++-
qemu-nbd.texi | 11 ++++++++++-
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 6588a1f..49dfc14 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -80,7 +80,16 @@ 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, --load-snapshot=SNAPSHOT_ID_OR_NAME\n"
+" load an internal snapshot inside FILE and export it\n"
+" as an read-only device\n"
+" -L, --load-snapshot1=SNAPSHOT_PARAM\n"
+" load an internal snapshot inside FILE and export it\n"
+" as an read-only device, SNAPSHOT_PARAM format is\n"
+" 'snapshot.id=[ID],snapshot.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..5940905 100644
--- a/qemu-nbd.texi
+++ b/qemu-nbd.texi
@@ -27,7 +27,16 @@ 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
address@hidden -L, address@hidden
+ load an internal snapshot inside @var{filename} and export it
+ as an read-only device, @var{snapshot_param} format is
+ 'snapshot.id=[ID],snapshot.name=[NAME]'
@item -n, --nocache
@itemx address@hidden
set cache mode to be used with the file. See the documentation of
--
1.7.1
- [Qemu-devel] [PATCH V3 0/7] export internal snapshot by qemu-nbd, Wenchao Xia, 2013/09/25
- [Qemu-devel] [PATCH V3 2/7] qemu-nbd: support internal snapshot export, Wenchao Xia, 2013/09/25
- [Qemu-devel] [PATCH V3 4/7] qemu-iotests: add 058 internal snapshot export with qemu-nbd case, Wenchao Xia, 2013/09/25
- [Qemu-devel] [PATCH V3 1/7] snapshot: distinguish id and name in load_tmp, Wenchao Xia, 2013/09/25
- [Qemu-devel] [PATCH V3 3/7] qemu-nbd: add doc for internal snapshot export,
Wenchao Xia <=
- [Qemu-devel] [PATCH V3 6/7] qemu-img: add doc for param -L in convert, Wenchao Xia, 2013/09/25
- [Qemu-devel] [PATCH V3 7/7] qemu-iotests: add test for snapshot in qemu-img convert, Wenchao Xia, 2013/09/25
- [Qemu-devel] [PATCH V3 5/7] qemu-img: add -L for snapshot in convert, Wenchao Xia, 2013/09/25
- Re: [Qemu-devel] [PATCH V3 0/7] export internal snapshot by qemu-nbd, Wenchao Xia, 2013/09/30