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nfsd: Don't keep looking up unhashed files in the nfsd file cache

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commit d30881f573e565ebb5dbb50b31ed6106b5c81328 upstream.

If a file is unhashed, then we're going to reject it anyway and retry,
so make sure we skip it when we're doing the RCU lockless lookup.
This avoids a number of unnecessary nfserr_jukebox returns from
nfsd_file_acquire()

Fixes: 65294c1f2c ("nfsd: add a new struct file caching facility to nfsd")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2021-02-18 21:02:07 -05:00 • committed by Greg Kroah-Hartman
commit 4c5fab560c
1 changed files with 2 additions and 0 deletions
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2
fs/nfsd/filecache.c
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@ -751,6 +751,8 @@ nfsd_file_find_locked(struct inode *inode, unsigned int may_flags,
continue;
if (!nfsd_match_cred(nf->nf_cred, current_cred()))
continue;
if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags))
continue;
if (nfsd_file_get(nf) != NULL)
return nf;
}