Re: [PATCH 1/2] NFSv4: Express delegation limit in units of pages

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----- Original Message -----
> From: "Trond Myklebust" <trond.myklebust@xxxxxxxxxxxxxxx>
> To: linux-nfs@xxxxxxxxxxxxxxx
> Sent: Sunday, September 6, 2015 1:06:57 AM
> Subject: [PATCH 1/2] NFSv4: Express delegation limit in units of pages

> Since we're tracking modifications to the page cache on a per-page
> basis, it makes sense to express the limit to how much we may cache
> in units of pages.
> 
> Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
> ---
> fs/nfs/delegation.c     |  5 +++--
> fs/nfs/delegation.h     |  2 +-
> fs/nfs/nfs4xdr.c        | 16 ++++++++++------
> include/linux/nfs_xdr.h |  2 +-
> 4 files changed, 15 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
> index 029d688a969f..4817f66c8d47 100644
> --- a/fs/nfs/delegation.c
> +++ b/fs/nfs/delegation.c
> @@ -175,7 +175,8 @@ void nfs_inode_reclaim_delegation(struct inode *inode,
> struct rpc_cred *cred,
> 		if (delegation->inode != NULL) {
> 			nfs4_stateid_copy(&delegation->stateid, &res->delegation);
> 			delegation->type = res->delegation_type;
> -			delegation->maxsize = res->maxsize;
> +			delegation->pagemod_limit = res->pagemod_limit;
> +				;

is this extra line with semicolon intended or a typo?

Tigran.

> 			oldcred = delegation->cred;
> 			delegation->cred = get_rpccred(cred);
> 			clear_bit(NFS_DELEGATION_NEED_RECLAIM,
> @@ -337,7 +338,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct
> rpc_cred *cred, struct
> 		return -ENOMEM;
> 	nfs4_stateid_copy(&delegation->stateid, &res->delegation);
> 	delegation->type = res->delegation_type;
> -	delegation->maxsize = res->maxsize;
> +	delegation->pagemod_limit = res->pagemod_limit;
> 	delegation->change_attr = inode->i_version;
> 	delegation->cred = get_rpccred(cred);
> 	delegation->inode = inode;
> diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
> index e3c20a3ccc93..554178a17376 100644
> --- a/fs/nfs/delegation.h
> +++ b/fs/nfs/delegation.h
> @@ -18,7 +18,7 @@ struct nfs_delegation {
> 	struct inode *inode;
> 	nfs4_stateid stateid;
> 	fmode_t type;
> -	loff_t maxsize;
> +	unsigned long pagemod_limit;
> 	__u64 change_attr;
> 	unsigned long flags;
> 	spinlock_t lock;
> diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
> index ff4784c54e04..788adf3897c7 100644
> --- a/fs/nfs/nfs4xdr.c
> +++ b/fs/nfs/nfs4xdr.c
> @@ -4932,24 +4932,28 @@ static int decode_lookup(struct xdr_stream *xdr)
> }
> 
> /* This is too sick! */
> -static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
> +static int decode_space_limit(struct xdr_stream *xdr,
> +		unsigned long *pagemod_limit)
> {
> 	__be32 *p;
> 	uint32_t limit_type, nblocks, blocksize;
> +	u64 maxsize = 0;
> 
> 	p = xdr_inline_decode(xdr, 12);
> 	if (unlikely(!p))
> 		goto out_overflow;
> 	limit_type = be32_to_cpup(p++);
> 	switch (limit_type) {
> -	case 1:
> -		xdr_decode_hyper(p, maxsize);
> +	case NFS4_LIMIT_SIZE:
> +		xdr_decode_hyper(p, &maxsize);
> 		break;
> -	case 2:
> +	case NFS4_LIMIT_BLOCKS:
> 		nblocks = be32_to_cpup(p++);
> 		blocksize = be32_to_cpup(p);
> -		*maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
> +		maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
> 	}
> +	maxsize >>= PAGE_CACHE_SHIFT;
> +	*pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
> 	return 0;
> out_overflow:
> 	print_overflow_msg(__func__, xdr);
> @@ -4977,7 +4981,7 @@ static int decode_rw_delegation(struct xdr_stream *xdr,
> 		break;
> 	case NFS4_OPEN_DELEGATE_WRITE:
> 		res->delegation_type = FMODE_WRITE|FMODE_READ;
> -		if (decode_space_limit(xdr, &res->maxsize) < 0)
> +		if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
> 				return -EIO;
> 	}
> 	return decode_ace(xdr, NULL, res->server->nfs_client);
> diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
> index b4392d86d157..52faf7e96c65 100644
> --- a/include/linux/nfs_xdr.h
> +++ b/include/linux/nfs_xdr.h
> @@ -406,8 +406,8 @@ struct nfs_openres {
> 	const struct nfs_server *server;
> 	fmode_t			delegation_type;
> 	nfs4_stateid		delegation;
> +	unsigned long		pagemod_limit;
> 	__u32			do_recall;
> -	__u64			maxsize;
> 	__u32			attrset[NFS4_BITMAP_SIZE];
> 	struct nfs4_string	*owner;
> 	struct nfs4_string	*group_owner;
> --
> 2.4.3
> 
> --
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