NFS: Filter cache invalidation when holding a delegation
If the client holds a delegation, then ensure we filter out attempts to invalidate the size, owner, group owner, or mode unless we made the change, in which case, check that NFS_INO_REVAL_FORCED is set by the caller. Always filter out attempts to invalidate the change attribute and size, since we are authoritative for those. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
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@ -195,10 +195,16 @@ bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
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static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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bool have_delegation = nfs_have_delegated_attributes(inode);
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bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
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if (have_delegation) {
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if (!(flags & NFS_INO_REVAL_FORCED))
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flags &= ~NFS_INO_INVALID_OTHER;
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flags &= ~(NFS_INO_INVALID_CHANGE
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| NFS_INO_INVALID_SIZE
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| NFS_INO_REVAL_PAGECACHE);
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}
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if (have_delegation)
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flags &= ~(NFS_INO_INVALID_CHANGE|NFS_INO_REVAL_PAGECACHE);
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if (inode->i_mapping->nrpages == 0)
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flags &= ~NFS_INO_INVALID_DATA;
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nfsi->cache_validity |= flags;
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