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| author | Yan, Zheng <zyan@redhat.com> | 2020-03-10 19:34:20 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2020-03-30 12:42:43 +0200 |
| commit | 0aa971b6fd3f92afef6afe24ef78d9bb14471519 (patch) | |
| tree | 96ba1545559e3c9dd2b29acaee2fb649f4e96862 | |
| parent | 42d70f8e31dfd3b795259b0d5c7ff4d4b45c24fd (diff) | |
| download | linux-0aa971b6fd3f92afef6afe24ef78d9bb14471519.tar.gz linux-0aa971b6fd3f92afef6afe24ef78d9bb14471519.tar.bz2 linux-0aa971b6fd3f92afef6afe24ef78d9bb14471519.zip | |
ceph: don't skip updating wanted caps when cap is stale
1. try_get_cap_refs() fails to get caps and finds that mds_wanted
does not include what it wants. It returns -ESTALE.
2. ceph_get_caps() calls ceph_renew_caps(). ceph_renew_caps() finds
that inode has cap, so it calls ceph_check_caps().
3. ceph_check_caps() finds that issued caps (without checking if it's
stale) already includes caps wanted by open file, so it skips
updating wanted caps.
Above events can cause an infinite loop inside ceph_get_caps().
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
| -rw-r--r-- | fs/ceph/caps.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 086bb3adc08a..be1ae4b92cfd 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2008,8 +2008,12 @@ retry_locked: } /* want more caps from mds? */ - if (want & ~(cap->mds_wanted | cap->issued)) - goto ack; + if (want & ~cap->mds_wanted) { + if (want & ~(cap->mds_wanted | cap->issued)) + goto ack; + if (!__cap_is_valid(cap)) + goto ack; + } /* things we might delay */ if ((cap->issued & ~retain) == 0) |