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nfsd: Replace use of rwsem with errseq_t

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commit 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb upstream.

The nfsd_file nf_rwsem is currently being used to separate file write
and commit instances to ensure that we catch errors and apply them to
the correct write/commit.
We can improve scalability at the expense of a little accuracy (some
extra false positives) by replacing the nf_rwsem with more careful
use of the errseq_t mechanism to track errors across the different
operations.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[ cel: rebased on zero-verifier fix ]
Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust
2021-12-18 20:38:01 -05:00
committed by Greg Kroah-Hartman
parent 56a7f57da5
commit f14816f2f9
4 changed files with 19 additions and 30 deletions
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fs/nfsd/filecache.h
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@@ -46,7 +46,6 @@ struct nfsd_file {
refcount_t nf_ref;
unsigned char nf_may;
struct nfsd_file_mark *nf_mark;
struct rw_semaphore nf_rwsem;
};
int nfsd_file_cache_init(void);