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NFSv4: Defer inode revalidation when setting up a delegation
Currently we force a synchronous call to __nfs_revalidate_inode() in nfs_inode_set_delegation(). This not only ensures that we cannot call nfs_inode_set_delegation from an asynchronous context, but it also slows down any call to open(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -124,10 +124,6 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
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struct nfs_delegation *delegation;
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int status = 0;
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/* Ensure we first revalidate the attributes and page cache! */
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if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR)))
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__nfs_revalidate_inode(NFS_SERVER(inode), inode);
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delegation = kmalloc(sizeof(*delegation), GFP_KERNEL);
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if (delegation == NULL)
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return -ENOMEM;
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@ -154,6 +150,12 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
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status = -EIO;
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}
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}
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/* Ensure we revalidate the attributes and page cache! */
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spin_lock(&inode->i_lock);
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nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
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spin_unlock(&inode->i_lock);
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spin_unlock(&clp->cl_lock);
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kfree(delegation);
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return status;
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@ -1072,8 +1072,10 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
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invalid &= ~NFS_INO_INVALID_DATA;
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if (data_stable)
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invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
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if (!nfs_have_delegation(inode, FMODE_READ))
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if (!nfs_have_delegation(inode, FMODE_READ) ||
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(nfsi->cache_validity & NFS_INO_REVAL_FORCED))
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nfsi->cache_validity |= invalid;
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nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
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return 0;
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out_changed:
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@ -184,6 +184,7 @@ struct nfs_inode {
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#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
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#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
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#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
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#define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
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/*
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* Bit offsets in flags field
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