[Xen-devel] [PATCH 0/2] xenstore: support reading directory with many children

[Juergen Gross <jgross@xxxxxxxx>]

Reading the children list of a xenstore node with the length of that
list exceeding 4096 bytes is currently not possible. This can be a
problem for a large host with a huge number of domains as Xen tools
will no longer by capable to scan some directories of xenstore (e.g.
/local/domain).

This small patch series adds a new xs wire command to read a directory
in multiple chunks. libxenstore is modified in a compatible way to
show an unmodified result in case xenstored doesn't support the new
command.

The patch set has been verified to work by using the following shell script:

xenstore-write /test "test"

for i in `seq 100 500`
do
    xenstore-write /test/entry_with_very_long_name_$i $i
done

xenstore-ls
xenstore-rm /test


Juergen Gross (2):
  xenstore: add support for reading directory with many children
  xenstore: support XS_DIRECTORY_PART in libxenstore

 tools/xenstore/xenstored_core.c        |  4 ++
 tools/xenstore/xenstored_transaction.c | 57 ++++++++++++++++++++++++++
 tools/xenstore/xenstored_transaction.h |  1 +
 tools/xenstore/xs.c                    | 74 ++++++++++++++++++++++++++++++----
 xen/include/public/io/xs_wire.h        |  1 +
 5 files changed, 129 insertions(+), 8 deletions(-)

-- 
2.6.6


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