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| author | Guillaume Nault <gnault@redhat.com> | 2020-01-14 00:39:22 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-01-14 22:28:40 +0300 |
| commit | 2dce224f469f060b9998a5a869151ef83c08ce77 (patch) | |
| tree | 2d192faaecde1c8af7bd6e8be08d69951735be35 /mm/zpool.c | |
| parent | 4905294162bda43bef65b411cf791005c7e15b28 (diff) | |
| download | linux-2dce224f469f060b9998a5a869151ef83c08ce77.tar.xz | |
netns: protect netns ID lookups with RCU
__peernet2id() can be protected by RCU as it only calls idr_for_each(),
which is RCU-safe, and never modifies the nsid table.
rtnl_net_dumpid() can also do lockless lookups. It does two nested
idr_for_each() calls on nsid tables (one direct call and one indirect
call because of rtnl_net_dumpid_one() calling __peernet2id()). The
netnsid tables are never updated. Therefore it is safe to not take the
nsid_lock and run within an RCU-critical section instead.
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/zpool.c')
0 files changed, 0 insertions, 0 deletions