linux-sg2042/net/ceph
Alex Elder c10ebbf55b libceph: init sent and completed when starting
The rbd code has a need to be able to restart an osd request that
has already been started and completed once before.  This currently
wouldn't work right because the osd client code assumes an osd
request will be started exactly once  Certain fields in a request
are never cleared and this leads to trouble if you try to reuse it.

Specifically, the r_sent, r_got_reply, and r_completed fields are
never cleared.  The r_sent field records the osd incarnation at the
time the request was sent to that osd.  If that's non-zero, the
message won't get re-mapped to a target osd properly, and won't be
put on the unsafe requests list the first time it's sent as it
should.  The r_got_reply field is used in handle_reply() to ensure
the reply to a request is processed only once.  And the r_completed
field is used for lingering requests to avoid calling the callback
function every time the osd client re-sends the request on behalf of
its initiator.

Each osd request passes through ceph_osdc_start_request() when
responsibility for the request is handed over to the osd client for
completion.  We can safely zero these three fields there each time a
request gets started.

One last related change--clear the r_linger flag when a request
is no longer registered as a linger request.

This resolves:
    http://tracker.ceph.com/issues/5026

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
2013-05-13 12:52:23 -05:00
..
crush crush: avoid recursion if we have already collided 2013-01-17 12:42:39 -06:00
Kconfig net/ceph: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:39:33 -08:00
Makefile libceph: create source file "net/ceph/snapshot.c" 2013-05-01 21:20:08 -07:00
armor.c libceph: Fix base64-decoding when input ends in newline. 2011-03-15 09:14:02 -07:00
auth.c libceph: wrap auth methods in a mutex 2013-05-01 21:17:15 -07:00
auth_none.c ceph: messenger: reduce args to create_authorizer 2012-05-17 08:18:12 -05:00
auth_none.h ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
auth_x.c libceph: wrap auth ops in wrapper functions 2013-05-01 21:17:14 -07:00
auth_x.h libceph: add update_authorizer auth method 2013-05-01 21:17:13 -07:00
auth_x_protocol.h ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
buffer.c net: allow GFP_HIGHMEM in __vmalloc() 2010-11-21 10:04:04 -08:00
ceph_common.c libceph: use slab cache for osd client requests 2013-05-02 11:58:41 -05:00
ceph_fs.c ceph: fix file mode calculation 2011-07-19 11:25:04 -07:00
ceph_hash.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
ceph_strings.c libceph: update ceph_osd_op_name() 2013-02-18 12:20:18 -06:00
crypto.c libceph: eliminate sparse warnings 2013-02-25 15:37:18 -06:00
crypto.h libceph: fix crypto key null deref, memory leak 2012-08-02 09:19:20 -07:00
debugfs.c libceph: keep source rather than message osd op array 2013-05-01 21:18:12 -07:00
messenger.c libceph: allocate ceph message data with a slab allocator 2013-05-02 11:58:36 -05:00
mon_client.c libceph: wrap auth ops in wrapper functions 2013-05-01 21:17:14 -07:00
msgpool.c libceph: initialize msgpool message types 2012-07-30 09:29:50 -07:00
osd_client.c libceph: init sent and completed when starting 2013-05-13 12:52:23 -05:00
osdmap.c libceph: define ceph_decode_pgid() only once 2013-05-01 21:17:52 -07:00
pagelist.c ceph: use list_move_tail instead of list_del/list_add_tail 2012-10-01 14:30:49 -05:00
pagevec.c libceph: drop return value from page vector copy routines 2013-02-19 19:14:05 -06:00
snapshot.c libceph: create source file "net/ceph/snapshot.c" 2013-05-01 21:20:08 -07:00