[linux-2.6-block.git] / fs / nfsd / nfs2acl.c

/*
 * Process version 2 NFSACL requests.
 *
 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
 */

#include "nfsd.h"
/* FIXME: nfsacl.h is a broken header */
#include <linux/nfsacl.h>
#include <linux/gfp.h>
#include "cache.h"
#include "xdr3.h"
#include "vfs.h"

#define NFSDDBG_FACILITY		NFSDDBG_PROC
#define RETURN_STATUS(st)	{ resp->status = (st); return (st); }

/*
 * NULL call.
 */
static __be32
nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	return nfs_ok;
}

/*
 * Get the Access and/or Default ACL of a file.
 */
static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
		struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
{
	struct posix_acl *acl;
	struct inode *inode;
	svc_fh *fh;
	__be32 nfserr = 0;

	dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));

	fh = fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	if (nfserr)
		RETURN_STATUS(nfserr);

	inode = d_inode(fh->fh_dentry);

	if (argp->mask & ~NFS_ACL_MASK)
		RETURN_STATUS(nfserr_inval);
	resp->mask = argp->mask;

	nfserr = fh_getattr(fh, &resp->stat);
	if (nfserr)
		RETURN_STATUS(nfserr);

	if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
		acl = get_acl(inode, ACL_TYPE_ACCESS);
		if (acl == NULL) {
			/* Solaris returns the inode's minimum ACL. */
			acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
		}
		if (IS_ERR(acl)) {
			nfserr = nfserrno(PTR_ERR(acl));
			goto fail;
		}
		resp->acl_access = acl;
	}
	if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
		/* Check how Solaris handles requests for the Default ACL
		   of a non-directory! */
		acl = get_acl(inode, ACL_TYPE_DEFAULT);
		if (IS_ERR(acl)) {
			nfserr = nfserrno(PTR_ERR(acl));
			goto fail;
		}
		resp->acl_default = acl;
	}

	/* resp->acl_{access,default} are released in nfssvc_release_getacl. */
	RETURN_STATUS(0);

fail:
	posix_acl_release(resp->acl_access);
	posix_acl_release(resp->acl_default);
	RETURN_STATUS(nfserr);
}

/*
 * Set the Access and/or Default ACL of a file.
 */
static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
		struct nfsd3_setaclargs *argp,
		struct nfsd_attrstat *resp)
{
	struct inode *inode;
	svc_fh *fh;
	__be32 nfserr = 0;
	int error;

	dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));

	fh = fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
	if (nfserr)
		goto out;

	inode = d_inode(fh->fh_dentry);

	error = fh_want_write(fh);
	if (error)
		goto out_errno;

	fh_lock(fh);

	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
	if (error)
		goto out_drop_lock;
	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
	if (error)
		goto out_drop_lock;

	fh_unlock(fh);

	fh_drop_write(fh);

	nfserr = fh_getattr(fh, &resp->stat);

out:
	/* argp->acl_{access,default} may have been allocated in
	   nfssvc_decode_setaclargs. */
	posix_acl_release(argp->acl_access);
	posix_acl_release(argp->acl_default);
	return nfserr;
out_drop_lock:
	fh_unlock(fh);
	fh_drop_write(fh);
out_errno:
	nfserr = nfserrno(error);
	goto out;
}

/*
 * Check file attributes
 */
static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
		struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
{
	__be32 nfserr;
	dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));

	fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	if (nfserr)
		return nfserr;
	nfserr = fh_getattr(&resp->fh, &resp->stat);
	return nfserr;
}

/*
 * Check file access
 */
static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
		struct nfsd3_accessres *resp)
{
	__be32 nfserr;

	dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
			SVCFH_fmt(&argp->fh),
			argp->access);

	fh_copy(&resp->fh, &argp->fh);
	resp->access = argp->access;
	nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
	if (nfserr)
		return nfserr;
	nfserr = fh_getattr(&resp->fh, &resp->stat);
	return nfserr;
}

/*
 * XDR decode functions
 */
static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclargs *argp)
{
	p = nfs2svc_decode_fh(p, &argp->fh);
	if (!p)
		return 0;
	argp->mask = ntohl(*p); p++;

	return xdr_argsize_check(rqstp, p);
}


static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_setaclargs *argp)
{
	struct kvec *head = rqstp->rq_arg.head;
	unsigned int base;
	int n;

	p = nfs2svc_decode_fh(p, &argp->fh);
	if (!p)
		return 0;
	argp->mask = ntohl(*p++);
	if (argp->mask & ~NFS_ACL_MASK ||
	    !xdr_argsize_check(rqstp, p))
		return 0;

	base = (char *)p - (char *)head->iov_base;
	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
			  (argp->mask & NFS_ACL) ?
			  &argp->acl_access : NULL);
	if (n > 0)
		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
				  (argp->mask & NFS_DFACL) ?
				  &argp->acl_default : NULL);
	return (n > 0);
}

static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd_fhandle *argp)
{
	p = nfs2svc_decode_fh(p, &argp->fh);
	if (!p)
		return 0;
	return xdr_argsize_check(rqstp, p);
}

static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_accessargs *argp)
{
	p = nfs2svc_decode_fh(p, &argp->fh);
	if (!p)
		return 0;
	argp->access = ntohl(*p++);

	return xdr_argsize_check(rqstp, p);
}

/*
 * XDR encode functions
 */

/*
 * There must be an encoding function for void results so svc_process
 * will work properly.
 */
static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}

/* GETACL */
static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclres *resp)
{
	struct dentry *dentry = resp->fh.fh_dentry;
	struct inode *inode;
	struct kvec *head = rqstp->rq_res.head;
	unsigned int base;
	int n;
	int w;

	/*
	 * Since this is version 2, the check for nfserr in
	 * nfsd_dispatch actually ensures the following cannot happen.
	 * However, it seems fragile to depend on that.
	 */
	if (dentry == NULL || d_really_is_negative(dentry))
		return 0;
	inode = d_inode(dentry);

	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	*p++ = htonl(resp->mask);
	if (!xdr_ressize_check(rqstp, p))
		return 0;
	base = (char *)p - (char *)head->iov_base;

	rqstp->rq_res.page_len = w = nfsacl_size(
		(resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
		(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
	while (w > 0) {
		if (!*(rqstp->rq_next_page++))
			return 0;
		w -= PAGE_SIZE;
	}

	n = nfsacl_encode(&rqstp->rq_res, base, inode,
			  resp->acl_access,
			  resp->mask & NFS_ACL, 0);
	if (n > 0)
		n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
				  resp->acl_default,
				  resp->mask & NFS_DFACL,
				  NFS_ACL_DEFAULT);
	return (n > 0);
}

static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd_attrstat *resp)
{
	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	return xdr_ressize_check(rqstp, p);
}

/* ACCESS */
static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_accessres *resp)
{
	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	*p++ = htonl(resp->access);
	return xdr_ressize_check(rqstp, p);
}

/*
 * XDR release functions
 */
static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclres *resp)
{
	fh_put(&resp->fh);
	posix_acl_release(resp->acl_access);
	posix_acl_release(resp->acl_default);
	return 1;
}

static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd_attrstat *resp)
{
	fh_put(&resp->fh);
	return 1;
}

static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
               struct nfsd3_accessres *resp)
{
       fh_put(&resp->fh);
       return 1;
}

#define nfsaclsvc_decode_voidargs	NULL
#define nfsaclsvc_release_void		NULL
#define nfsd3_fhandleargs	nfsd_fhandle
#define nfsd3_attrstatres	nfsd_attrstat
#define nfsd3_voidres		nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize)	\
 { (svc_procfunc) nfsacld_proc_##name,		\
   (kxdrproc_t) nfsaclsvc_decode_##argt##args,	\
   (kxdrproc_t) nfsaclsvc_encode_##rest##res,	\
   (kxdrproc_t) nfsaclsvc_release_##relt,		\
   sizeof(struct nfsd3_##argt##args),		\
   sizeof(struct nfsd3_##rest##res),		\
   0,						\
   cache,					\
   respsize,					\
 }

#define ST 1		/* status*/
#define AT 21		/* attributes */
#define pAT (1+AT)	/* post attributes - conditional */
#define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */

static struct svc_procedure		nfsd_acl_procedures2[] = {
  PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
  PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),
  PROC(setacl,	setacl,		attrstat,	attrstat, RC_NOCACHE, ST+AT),
  PROC(getattr, fhandle,	attrstat,	attrstat, RC_NOCACHE, ST+AT),
  PROC(access,	access,		access,		access,   RC_NOCACHE, ST+AT+1),
};

struct svc_version	nfsd_acl_version2 = {
		.vs_vers	= 2,
		.vs_nproc	= 5,
		.vs_proc	= nfsd_acl_procedures2,
		.vs_dispatch	= nfsd_dispatch,
		.vs_xdrsize	= NFS3_SVC_XDRSIZE,
		.vs_hidden	= 0,
};
Commit	Line	Data
a257cdd0	1	/*
a257cdd0 AG	2	* Process version 2 NFSACL requests.
	3	*
	4	* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
	5	*/
	6
9a74af21 BH	7	#include "nfsd.h"
9a74af21 BH	8	/* FIXME: nfsacl.h is a broken header */
a257cdd0	9	#include <linux/nfsacl.h>
5a0e3ad6	10	#include <linux/gfp.h>
9a74af21 BH	11	#include "cache.h"
9a74af21 BH	12	#include "xdr3.h"
0a3adade	13	#include "vfs.h"
a257cdd0 AG	14
	15	#define NFSDDBG_FACILITY NFSDDBG_PROC
	16	#define RETURN_STATUS(st) { resp->status = (st); return (st); }
	17
	18	/*
	19	* NULL call.
	20	*/
7111c66e	21	static __be32
a257cdd0 AG	22	nfsacld_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	23	{
	24	return nfs_ok;
	25	}
	26
	27	/*
	28	* Get the Access and/or Default ACL of a file.
	29	*/
7111c66e	30	static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
a257cdd0 AG	31	struct nfsd3_getaclargs argp, struct nfsd3_getaclres resp)
a257cdd0 AG	32	{
a257cdd0	33	struct posix_acl *acl;
4ac7249e CH	34	struct inode *inode;
4ac7249e CH	35	svc_fh *fh;
c4d987ba	36	__be32 nfserr = 0;
a257cdd0 AG	37
	38	dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
	39
	40	fh = fh_copy(&resp->fh, &argp->fh);
8837abca MS	41	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
8837abca MS	42	if (nfserr)
ac8587dc	43	RETURN_STATUS(nfserr);
a257cdd0	44
2b0143b5	45	inode = d_inode(fh->fh_dentry);
4ac7249e	46
7b8f4586	47	if (argp->mask & ~NFS_ACL_MASK)
a257cdd0 AG	48	RETURN_STATUS(nfserr_inval);
	49	resp->mask = argp->mask;
	50
4f4a4fad BF	51	nfserr = fh_getattr(fh, &resp->stat);
4f4a4fad BF	52	if (nfserr)
7b8f4586	53	RETURN_STATUS(nfserr);
4f4a4fad	54
a257cdd0	55	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
4ac7249e	56	acl = get_acl(inode, ACL_TYPE_ACCESS);
a257cdd0 AG	57	if (acl == NULL) {
a257cdd0 AG	58	/* Solaris returns the inode's minimum ACL. */
a257cdd0 AG	59	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
a257cdd0 AG	60	}
35e634b8 KM	61	if (IS_ERR(acl)) {
	62	nfserr = nfserrno(PTR_ERR(acl));
	63	goto fail;
	64	}
a257cdd0 AG	65	resp->acl_access = acl;
	66	}
	67	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	68	/* Check how Solaris handles requests for the Default ACL
	69	of a non-directory! */
4ac7249e	70	acl = get_acl(inode, ACL_TYPE_DEFAULT);
a257cdd0	71	if (IS_ERR(acl)) {
4ac7249e CH	72	nfserr = nfserrno(PTR_ERR(acl));
4ac7249e CH	73	goto fail;
a257cdd0 AG	74	}
	75	resp->acl_default = acl;
	76	}
	77
	78	/* resp->acl_{access,default} are released in nfssvc_release_getacl. */
	79	RETURN_STATUS(0);
	80
	81	fail:
	82	posix_acl_release(resp->acl_access);
	83	posix_acl_release(resp->acl_default);
	84	RETURN_STATUS(nfserr);
	85	}
	86
	87	/*
	88	* Set the Access and/or Default ACL of a file.
	89	*/
7111c66e	90	static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
a257cdd0 AG	91	struct nfsd3_setaclargs *argp,
	92	struct nfsd_attrstat *resp)
	93	{
4ac7249e	94	struct inode *inode;
a257cdd0	95	svc_fh *fh;
c4d987ba	96	__be32 nfserr = 0;
4ac7249e	97	int error;
a257cdd0 AG	98
	99	dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
	100
	101	fh = fh_copy(&resp->fh, &argp->fh);
8837abca	102	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
4ac7249e CH	103	if (nfserr)
4ac7249e CH	104	goto out;
a257cdd0	105
2b0143b5	106	inode = d_inode(fh->fh_dentry);
a257cdd0	107
4ac7249e CH	108	error = fh_want_write(fh);
	109	if (error)
	110	goto out_errno;
	111
99965378 BH	112	fh_lock(fh);
	113
	114	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
4ac7249e	115	if (error)
99965378 BH	116	goto out_drop_lock;
99965378 BH	117	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
4ac7249e	118	if (error)
99965378 BH	119	goto out_drop_lock;
	120
	121	fh_unlock(fh);
4ac7249e CH	122
	123	fh_drop_write(fh);
	124
	125	nfserr = fh_getattr(fh, &resp->stat);
	126
	127	out:
a257cdd0 AG	128	/* argp->acl_{access,default} may have been allocated in
	129	nfssvc_decode_setaclargs. */
	130	posix_acl_release(argp->acl_access);
	131	posix_acl_release(argp->acl_default);
	132	return nfserr;
99965378 BH	133	out_drop_lock:
99965378 BH	134	fh_unlock(fh);
4ac7249e CH	135	fh_drop_write(fh);
	136	out_errno:
	137	nfserr = nfserrno(error);
	138	goto out;
a257cdd0 AG	139	}
	140
	141	/*
	142	* Check file attributes
	143	*/
7111c66e	144	static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
a257cdd0 AG	145	struct nfsd_fhandle argp, struct nfsd_attrstat resp)
a257cdd0 AG	146	{
4f4a4fad	147	__be32 nfserr;
a257cdd0 AG	148	dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
	149
	150	fh_copy(&resp->fh, &argp->fh);
4f4a4fad BF	151	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	152	if (nfserr)
	153	return nfserr;
	154	nfserr = fh_getattr(&resp->fh, &resp->stat);
	155	return nfserr;
a257cdd0 AG	156	}
	157
	158	/*
	159	* Check file access
	160	*/
7111c66e	161	static __be32 nfsacld_proc_access(struct svc_rqst rqstp, struct nfsd3_accessargs argp,
a257cdd0 AG	162	struct nfsd3_accessres *resp)
a257cdd0 AG	163	{
c4d987ba	164	__be32 nfserr;
a257cdd0 AG	165
	166	dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
	167	SVCFH_fmt(&argp->fh),
	168	argp->access);
	169
	170	fh_copy(&resp->fh, &argp->fh);
	171	resp->access = argp->access;
	172	nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
4f4a4fad BF	173	if (nfserr)
	174	return nfserr;
	175	nfserr = fh_getattr(&resp->fh, &resp->stat);
a257cdd0 AG	176	return nfserr;
	177	}
	178
	179	/*
	180	* XDR decode functions
	181	*/
131a21c2	182	static int nfsaclsvc_decode_getaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	183	struct nfsd3_getaclargs *argp)
a257cdd0 AG	184	{
d40aa337 BT	185	p = nfs2svc_decode_fh(p, &argp->fh);
d40aa337 BT	186	if (!p)
a257cdd0 AG	187	return 0;
	188	argp->mask = ntohl(*p); p++;
	189
	190	return xdr_argsize_check(rqstp, p);
	191	}
	192
	193
131a21c2	194	static int nfsaclsvc_decode_setaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	195	struct nfsd3_setaclargs *argp)
	196	{
	197	struct kvec *head = rqstp->rq_arg.head;
	198	unsigned int base;
	199	int n;
	200
d40aa337 BT	201	p = nfs2svc_decode_fh(p, &argp->fh);
d40aa337 BT	202	if (!p)
a257cdd0 AG	203	return 0;
a257cdd0 AG	204	argp->mask = ntohl(*p++);
7b8f4586	205	if (argp->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	206	!xdr_argsize_check(rqstp, p))
	207	return 0;
	208
	209	base = (char )p - (char )head->iov_base;
	210	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	211	(argp->mask & NFS_ACL) ?
	212	&argp->acl_access : NULL);
	213	if (n > 0)
	214	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	215	(argp->mask & NFS_DFACL) ?
	216	&argp->acl_default : NULL);
	217	return (n > 0);
	218	}
	219
131a21c2	220	static int nfsaclsvc_decode_fhandleargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	221	struct nfsd_fhandle *argp)
a257cdd0 AG	222	{
d40aa337 BT	223	p = nfs2svc_decode_fh(p, &argp->fh);
d40aa337 BT	224	if (!p)
a257cdd0 AG	225	return 0;
	226	return xdr_argsize_check(rqstp, p);
	227	}
	228
131a21c2	229	static int nfsaclsvc_decode_accessargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	230	struct nfsd3_accessargs *argp)
a257cdd0 AG	231	{
d40aa337 BT	232	p = nfs2svc_decode_fh(p, &argp->fh);
d40aa337 BT	233	if (!p)
a257cdd0 AG	234	return 0;
	235	argp->access = ntohl(*p++);
	236
	237	return xdr_argsize_check(rqstp, p);
	238	}
	239
	240	/*
	241	* XDR encode functions
	242	*/
	243
1b7e0403 PS	244	/*
	245	* There must be an encoding function for void results so svc_process
	246	* will work properly.
	247	*/
9c0b0ff7	248	static int nfsaclsvc_encode_voidres(struct svc_rqst rqstp, __be32 p, void *dummy)
1b7e0403 PS	249	{
	250	return xdr_ressize_check(rqstp, p);
	251	}
	252
a257cdd0	253	/* GETACL */
131a21c2	254	static int nfsaclsvc_encode_getaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	255	struct nfsd3_getaclres *resp)
	256	{
	257	struct dentry *dentry = resp->fh.fh_dentry;
aefa89d1	258	struct inode *inode;
a257cdd0 AG	259	struct kvec *head = rqstp->rq_res.head;
	260	unsigned int base;
	261	int n;
cb65a5ba	262	int w;
a257cdd0	263
aefa89d1 P	264	/*
	265	* Since this is version 2, the check for nfserr in
	266	* nfsd_dispatch actually ensures the following cannot happen.
	267	* However, it seems fragile to depend on that.
	268	*/
2b0143b5	269	if (dentry == NULL \|\| d_really_is_negative(dentry))
a257cdd0	270	return 0;
2b0143b5	271	inode = d_inode(dentry);
a257cdd0	272
4f4a4fad	273	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
a257cdd0 AG	274	*p++ = htonl(resp->mask);
	275	if (!xdr_ressize_check(rqstp, p))
	276	return 0;
	277	base = (char )p - (char )head->iov_base;
	278
cb65a5ba JJ	279	rqstp->rq_res.page_len = w = nfsacl_size(
	280	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	281	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	282	while (w > 0) {
afc59400	283	if (!*(rqstp->rq_next_page++))
a257cdd0 AG	284	return 0;
	285	w -= PAGE_SIZE;
	286	}
	287
	288	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	289	resp->acl_access,
	290	resp->mask & NFS_ACL, 0);
	291	if (n > 0)
	292	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	293	resp->acl_default,
	294	resp->mask & NFS_DFACL,
	295	NFS_ACL_DEFAULT);
7b8f4586	296	return (n > 0);
a257cdd0 AG	297	}
a257cdd0 AG	298
131a21c2	299	static int nfsaclsvc_encode_attrstatres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	300	struct nfsd_attrstat *resp)
a257cdd0 AG	301	{
4f4a4fad	302	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
a257cdd0 AG	303	return xdr_ressize_check(rqstp, p);
	304	}
	305
	306	/* ACCESS */
131a21c2	307	static int nfsaclsvc_encode_accessres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	308	struct nfsd3_accessres *resp)
a257cdd0 AG	309	{
4f4a4fad	310	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
a257cdd0 AG	311	*p++ = htonl(resp->access);
	312	return xdr_ressize_check(rqstp, p);
	313	}
	314
	315	/*
	316	* XDR release functions
	317	*/
131a21c2	318	static int nfsaclsvc_release_getacl(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	319	struct nfsd3_getaclres *resp)
	320	{
	321	fh_put(&resp->fh);
	322	posix_acl_release(resp->acl_access);
	323	posix_acl_release(resp->acl_default);
	324	return 1;
	325	}
	326
c9ce2283 GB	327	static int nfsaclsvc_release_attrstat(struct svc_rqst rqstp, __be32 p,
c9ce2283 GB	328	struct nfsd_attrstat *resp)
a257cdd0 AG	329	{
	330	fh_put(&resp->fh);
	331	return 1;
	332	}
	333
c9ce2283 GB	334	static int nfsaclsvc_release_access(struct svc_rqst rqstp, __be32 p,
	335	struct nfsd3_accessres *resp)
	336	{
	337	fh_put(&resp->fh);
	338	return 1;
	339	}
	340
a257cdd0	341	#define nfsaclsvc_decode_voidargs NULL
a257cdd0 AG	342	#define nfsaclsvc_release_void NULL
	343	#define nfsd3_fhandleargs nfsd_fhandle
	344	#define nfsd3_attrstatres nfsd_attrstat
	345	#define nfsd3_voidres nfsd3_voidargs
	346	struct nfsd3_voidargs { int dummy; };
	347
	348	#define PROC(name, argt, rest, relt, cache, respsize) \
	349	{ (svc_procfunc) nfsacld_proc_##name, \
	350	(kxdrproc_t) nfsaclsvc_decode_##argt##args, \
	351	(kxdrproc_t) nfsaclsvc_encode_##rest##res, \
	352	(kxdrproc_t) nfsaclsvc_release_##relt, \
	353	sizeof(struct nfsd3_##argt##args), \
	354	sizeof(struct nfsd3_##rest##res), \
	355	0, \
	356	cache, \
	357	respsize, \
	358	}
	359
	360	#define ST 1 /* status*/
	361	#define AT 21 /* attributes */
	362	#define pAT (1+AT) /* post attributes - conditional */
	363	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	364
	365	static struct svc_procedure nfsd_acl_procedures2[] = {
	366	PROC(null, void, void, void, RC_NOCACHE, ST),
	367	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
c9ce2283 GB	368	PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT),
	369	PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT),
	370	PROC(access, access, access, access, RC_NOCACHE, ST+AT+1),
a257cdd0 AG	371	};
	372
	373	struct svc_version nfsd_acl_version2 = {
	374	.vs_vers = 2,
	375	.vs_nproc = 5,
	376	.vs_proc = nfsd_acl_procedures2,
	377	.vs_dispatch = nfsd_dispatch,
	378	.vs_xdrsize = NFS3_SVC_XDRSIZE,
1b7e0403	379	.vs_hidden = 0,
a257cdd0	380	};