diff mbox series

[v7,3/3] docs: Document share-rw property more thoroughly

Message ID 20180209052915.12855-4-famz@redhat.com
State New
Headers show
Series qemu-img: Document --force-share / -U | expand

Commit Message

Fam Zheng Feb. 9, 2018, 5:29 a.m. UTC
Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
 docs/qemu-block-drivers.texi | 10 ++++++++++
 1 file changed, 10 insertions(+)
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diff --git a/docs/qemu-block-drivers.texi b/docs/qemu-block-drivers.texi
index cd74767ed3..f1793692bb 100644
--- a/docs/qemu-block-drivers.texi
+++ b/docs/qemu-block-drivers.texi
@@ -845,6 +845,16 @@  QEMU transparently handles lock handover during shared storage migration.  For
 shared virtual disk images between multiple VMs, the "share-rw" device option
 should be used.
+By default, the guest has exclusive write access to its disk image. If the
+guest can safely share the disk image with other writers the @code{-device
+...,share-rw=on} parameter can be used.  This is only safe if the guest is
+running software, such as a cluster file system, that coordinates disk accesses
+to avoid corruption.
+Note that share-rw=on only declares the guest's ability to share the disk.
+Some QEMU features, such as image file formats, require exclusive write access
+to the disk image and this is unaffected by the share-rw=on option.
 Alternatively, locking can be fully disabled by "locking=off" block device
 option. In the command line, the option is usually in the form of
 "file.locking=off" as the protocol driver is normally placed as a "file" child