Commit 79fb54ab authored by Benny Halevy's avatar Benny Halevy Committed by J. Bruce Fields
Browse files

nfsd41: CREATE_EXCLUSIVE4_1 

Implement the CREATE_EXCLUSIVE4_1 open mode conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26



This mode allows the client to atomically create a file
if it doesn't exist while setting some of its attributes.

It must be implemented if the server supports persistent
reply cache and/or pnfs.

Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
parent 8c18f205

fs/nfsd/nfs4proc.c

+15 −0
Original line number Diff line number Diff line
@@ -93,6 +93,21 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o 
	open->op_truncate = 0;



	if (open->op_create) {

		/* FIXME: check session persistence and pnfs flags.

		 * The nfsv4.1 spec requires the following semantics:

		 *

		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed

		 * Reply Cache  | server |                 |

		 * -------------+--------+-----------------+--------------------

		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1

		 *              |        |                 | (SHOULD)

		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4

		 *              |        |                 | (SHOULD NOT)

		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1

		 * yes          | no     | GUARDED4        | GUARDED4

		 * yes          | yes    | GUARDED4        | GUARDED4

		 */



		/*

		 * Note: create modes (UNCHECKED,GUARDED...) are the same

		 * in NFSv4 as in v3.

fs/nfsd/nfs4xdr.c

+17 −0
Original line number Diff line number Diff line
@@ -260,6 +260,12 @@ static u32 nfsd_attrmask[] = { 
	NFSD_WRITEABLE_ATTRS_WORD2

};



static u32 nfsd41_ex_attrmask[] = {

	NFSD_SUPPATTR_EXCLCREAT_WORD0,

	NFSD_SUPPATTR_EXCLCREAT_WORD1,

	NFSD_SUPPATTR_EXCLCREAT_WORD2

};



static __be32

nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, u32 *writable,

		   struct iattr *iattr, struct nfs4_acl **acl)
@@ -684,6 +690,17 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 
			READ_BUF(8);

			COPYMEM(open->op_verf.data, 8);

			break;

		case NFS4_CREATE_EXCLUSIVE4_1:

			if (argp->minorversion < 1)

				goto xdr_error;

			READ_BUF(8);

			COPYMEM(open->op_verf.data, 8);

			status = nfsd4_decode_fattr(argp, open->op_bmval,

				nfsd41_ex_attrmask, &open->op_iattr,

				&open->op_acl);

			if (status)

				goto out;

			break;

		default:

			goto xdr_error;

		}

include/linux/nfs4.h

+7 −1
Original line number Diff line number Diff line
@@ -368,7 +368,13 @@ enum opentype4 { 
enum createmode4 {

	NFS4_CREATE_UNCHECKED = 0,

	NFS4_CREATE_GUARDED = 1,

	NFS4_CREATE_EXCLUSIVE = 2

	NFS4_CREATE_EXCLUSIVE = 2,

	/*

	 * New to NFSv4.1. If session is persistent,

	 * GUARDED4 MUST be used. Otherwise, use

	 * EXCLUSIVE4_1 instead of EXCLUSIVE4.

	 */

	NFS4_CREATE_EXCLUSIVE4_1 = 3

};



enum limit_by4 {

include/linux/nfsd/xdr4.h

+4 −6
Original line number Diff line number Diff line
@@ -219,10 +219,8 @@ struct nfsd4_open { 
	u32		op_create;     	    /* request */

	u32		op_createmode;      /* request */

	u32		op_bmval[3];        /* request */

	union {                             /* request */

		struct iattr	iattr;                      /* UNCHECKED4,GUARDED4 */

	struct iattr	iattr;              /* UNCHECKED4, GUARDED4, EXCLUSIVE4_1 */

	nfs4_verifier	verf;               /* EXCLUSIVE4 */

	} u;

	clientid_t	op_clientid;        /* request */

	struct xdr_netobj op_owner;           /* request */

	u32		op_seqid;           /* request */
@@ -236,8 +234,8 @@ struct nfsd4_open { 
	struct nfs4_stateowner *op_stateowner; /* used during processing */

	struct nfs4_acl *op_acl;

};

#define op_iattr	u.iattr

#define op_verf		u.verf

#define op_iattr	iattr

#define op_verf		verf



struct nfsd4_open_confirm {

	stateid_t	oc_req_stateid		/* request */;

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