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authorPranith Kumar K <pkarampu@redhat.com>2017-03-30 14:58:38 +0530
committerPranith Kumar Karampuri <pkarampu@redhat.com>2017-04-04 08:44:53 -0400
commitb75fa35694af916e0923f10e4f9491c364a4ba79 (patch)
tree7c7c40378fad097228b5a8b61bc7ed480214d4a9 /xlators/cluster/dht/src/dht-common.c
parentcdddb819b964eff0268498e8bfa0e67c77782094 (diff)
cluster/dht: Modify local->loc.gfid in thread safe manner
Problem: local->loc.gfid in dht_lookup_directory() will be null-gfid for a fresh lookup. dht_lookup_dir_cbk() updates local->loc.gfid while in other thread dht_lookup_directory() is still winding lookup calls to subvolumes so there is a chance of partial gfid being seen by EC. We saw in 12x(4+2) volume, ec is receiving an loc where the gfid has last 10 bytes matching with the gfid of the directory and the first 4 bytes are all-zeros. This is leading to EC erroring out the lookup with EINVAL which leads to NFS failing lookup with EIO. snip from gdb: $37 = (dht_local_t *) 0x7fde5de5b3cc (gdb) p /x $37->loc.gfid $39 = {0x3b, 0x82, 0x10, 0x5e, 0x40, 0x65, 0x43, 0x14, 0xa0, 0xc6, 0x8, 0xf5, 0x6c, 0x2c, 0xb8, 0x56} (gdb) fr 7 state=<optimized out>) at ec-generic.c:837 837 ec_lookup_rebuild(fop->xl->private, fop, cbk); (gdb) p /x fop->loc[0].gfid $40 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x43, 0x14, 0xa0, 0xc6, 0x8, 0xf5, 0x6c, 0x2c, 0xb8, 0x56} snip from log: [2017-01-29 03:22:30.132328] W [MSGID: 122019] [ec-helpers.c:354:ec_loc_gfid_check] 0-butcher-disperse-4: Mismatching GFID's in loc [2017-01-29 03:22:30.132709] W [MSGID: 112199] [nfs3-helpers.c:3515:nfs3_log_newfh_res] 0-nfs-nfsv3: /linux-4.9.5/Documentation => (XID: b27b9474, MKDIR: NFS: 5(I/O error), POSIX: 5(Input/output error)), FH: exportid 00000000-0000-0000-0000-000000000000, gfid 00000000-0000-0000-0000-000000000000, mountid 00000000-0000-0000-0000-000000000000 [Invalid argument] Fix: update local->loc.gfid in last-call to make sure there are no races. BUG: 1438411 Change-Id: Ifcb7e911568c1f1f83123da6ff0cf742b91800a0 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: https://review.gluster.org/16986 Reviewed-by: Raghavendra G <rgowdapp@redhat.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org> Smoke: Gluster Build System <jenkins@build.gluster.org>
Diffstat (limited to 'xlators/cluster/dht/src/dht-common.c')
-rw-r--r--xlators/cluster/dht/src/dht-common.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index da6c111..a74de14 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -810,8 +810,6 @@ dht_lookup_dir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
if (!op_ret && gf_uuid_is_null (local->gfid))
memcpy (local->gfid, stbuf->ia_gfid, 16);
- memcpy (local->loc.gfid, local->gfid, 16);
-
/* Check if the gfid is different for file from other node */
if (!op_ret && gf_uuid_compare (local->gfid, stbuf->ia_gfid)) {
@@ -879,6 +877,8 @@ unlock:
this_call_cnt = dht_frame_return (frame);
if (is_last_call (this_call_cnt)) {
+ gf_uuid_copy (local->loc.gfid, local->gfid);
+
if (local->need_selfheal) {
local->need_selfheal = 0;
dht_lookup_everywhere (frame, this, &local->loc);
@@ -919,7 +919,6 @@ unlock:
selfheal:
FRAME_SU_DO (frame, dht_local_t);
- gf_uuid_copy (local->loc.gfid, local->gfid);
ret = dht_selfheal_directory (frame, dht_lookup_selfheal_cbk,
&local->loc, layout);
out: