Michael Roth 39097daf15 qemu-ga: use key-value store to avoid recycling fd handles after restart ... Hosts hold on to handles provided by guest-file-open for periods that can span beyond the life of the qemu-ga process that issued them. Since these are issued starting from 0 on every restart, we run the risk of issuing duplicate handles after restarts/reboots. As a result, users with a stale copy of these handles may end up reading/writing corrupted data due to their existing handles effectively being re-assigned to an unexpected file or offset. We unfortunately do not issue handles as strings, but as integers, so a solution such as using UUIDs can't be implemented without introducing a new interface. As a workaround, we fix this by implementing a persistent key-value store that will be used to track the value of the last handle that was issued across restarts/reboots to avoid issuing duplicates. The store is automatically written to the same directory we currently set via --statedir to track fsfreeze state, and so should be applicable for stable releases where this flag is supported. A follow-up can use this same store for handling fsfreeze state, but that change is cosmetic and left out for now. Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Cc: qemu-stable@nongnu.org * fixed guest_file_handle_add() return value from uint64_t to int64_t		2013-03-11 18:53:47 -05:00
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channel-posix.c	qemu-ga: Handle errors uniformely in ga_channel_open()	2013-01-14 12:08:05 -06:00
channel-win32.c	qemu-ga: fix confusing GAChannelMethod comparison	2013-03-11 18:53:46 -05:00
channel.h
commands-posix.c	qemu-ga: use key-value store to avoid recycling fd handles after restart	2013-03-11 18:53:47 -05:00
commands-win32.c	qapi: move include files to include/qobject/	2012-12-19 08:31:31 +01:00
commands.c	qemu-ga: Fix unchecked strdup() by converting to g_strdup()	2013-01-30 11:14:46 +01:00
guest-agent-command-state.c
guest-agent-core.h	qemu-ga: use key-value store to avoid recycling fd handles after restart	2013-03-11 18:53:47 -05:00
main.c	qemu-ga: use key-value store to avoid recycling fd handles after restart	2013-03-11 18:53:47 -05:00
Makefile.objs	qemu-ga: move qemu-ga files to qga/	2012-12-19 08:31:30 +01:00
qapi-schema.json	qga: add missing commas in json docs	2013-01-14 16:15:26 -06:00
service-win32.c	qga: cast to int for DWORD type	2013-03-11 18:53:46 -05:00
service-win32.h