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| author |   Trond Myklebust <trondmy@gmail.com> | 2020-02-13 14:51:06 -0500 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2020-02-13 16:18:50 -0500 |
| commit | 8c75593c6eee0f661ddf25dfde0e6ad2a84be7a9 (patch) | |
| tree | b4af6d59d60f5e555082220cdde1798610e5dff9 /fs/nfs/delegation.h | |
| parent | NFSv4.1 make cachethis=no for writes (diff) | |
| download | linux-dev-8c75593c6eee0f661ddf25dfde0e6ad2a84be7a9.tar.xz linux-dev-8c75593c6eee0f661ddf25dfde0e6ad2a84be7a9.zip | |
NFSv4: Ensure the delegation is pinned in nfs_do_return_delegation()
The call to nfs_do_return_delegation() needs to be taken without
any RCU locks. Add a refcount to make sure the delegation remains
pinned in memory until we're done.
Fixes: ee05f456772d ("NFSv4: Fix races between open and delegreturn")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/delegation.h')
| -rw-r--r-- | fs/nfs/delegation.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h index 31b84604d383..9b00a0b7f832 100644 --- a/fs/nfs/delegation.h +++ b/fs/nfs/delegation.h @@ -22,6 +22,7 @@ struct nfs_delegation { unsigned long pagemod_limit; __u64 change_attr; unsigned long flags; + refcount_t refcount; spinlock_t lock; struct rcu_head rcu; }; |