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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2019-05-22 08:38:57 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2019-07-06 14:54:49 -0400 |
| commit | 1c341b777501613aad83f9c233a3fe5701cff083 (patch) | |
| tree | a0502ea51a60baedffff7a73b0f762244b469a2b /fs/nfs/dir.c | |
| parent | 44942b4e457beda00981f616402a1a791e8c616e (diff) | |
| download | lwn-1c341b777501613aad83f9c233a3fe5701cff083.tar.gz lwn-1c341b777501613aad83f9c233a3fe5701cff083.zip | |
NFS: Add deferred cache invalidation for close-to-open consistency violations
If the client detects that close-to-open cache consistency has been
violated, and that the file or directory has been changed on the
server, then do a cache invalidation when we're done working with
the file.
The reason we don't do an immediate cache invalidation is that we
want to avoid performance problems due to false positives. Also,
note that we cannot guarantee cache consistency in this situation
even if we do invalidate the cache.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/dir.c')
| -rw-r--r-- | fs/nfs/dir.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 57b6a45576ad..bd1f9555447b 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -80,6 +80,10 @@ static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir ctx->dup_cookie = 0; ctx->cred = get_cred(cred); spin_lock(&dir->i_lock); + if (list_empty(&nfsi->open_files) && + (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) + nfsi->cache_validity |= NFS_INO_INVALID_DATA | + NFS_INO_REVAL_FORCED; list_add(&ctx->list, &nfsi->open_files); spin_unlock(&dir->i_lock); return ctx; |