[linux-2.6-block.git] / fs / nfsd / nfs3acl.c

/*
 * Process version 3 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 RETURN_STATUS(st)	{ resp->status = (st); return (st); }

/*
 * NULL call.
 */
static __be32
nfsd3_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 nfsd3_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;

	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;

	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 nfs3svc_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 nfsd3_proc_setacl(struct svc_rqst * rqstp,
		struct nfsd3_setaclargs *argp,
		struct nfsd3_attrstat *resp)
{
	struct inode *inode;
	svc_fh *fh;
	__be32 nfserr = 0;
	int error;

	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);
	if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) {
		error = -EOPNOTSUPP;
		goto out_errno;
	}

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

	error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS);
	if (error)
		goto out_drop_write;
	error = inode->i_op->set_acl(inode, argp->acl_default,
				     ACL_TYPE_DEFAULT);

out_drop_write:
	fh_drop_write(fh);
out_errno:
	nfserr = nfserrno(error);
out:
	/* argp->acl_{access,default} may have been allocated in
	   nfs3svc_decode_setaclargs. */
	posix_acl_release(argp->acl_access);
	posix_acl_release(argp->acl_default);
	RETURN_STATUS(nfserr);
}

/*
 * XDR decode functions
 */
static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclargs *args)
{
	p = nfs3svc_decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->mask = ntohl(*p); p++;

	return xdr_argsize_check(rqstp, p);
}


static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_setaclargs *args)
{
	struct kvec *head = rqstp->rq_arg.head;
	unsigned int base;
	int n;

	p = nfs3svc_decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->mask = ntohl(*p++);
	if (args->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,
			  (args->mask & NFS_ACL) ?
			  &args->acl_access : NULL);
	if (n > 0)
		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
				  (args->mask & NFS_DFACL) ?
				  &args->acl_default : NULL);
	return (n > 0);
}

/*
 * XDR encode functions
 */

/* GETACL */
static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclres *resp)
{
	struct dentry *dentry = resp->fh.fh_dentry;

	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
		struct inode *inode = d_inode(dentry);
		struct kvec *head = rqstp->rq_res.head;
		unsigned int base;
		int n;
		int w;

		*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);
		if (n <= 0)
			return 0;
	} else
		if (!xdr_ressize_check(rqstp, p))
			return 0;

	return 1;
}

/* SETACL */
static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_attrstat *resp)
{
	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);

	return xdr_ressize_check(rqstp, p);
}

/*
 * XDR release functions
 */
static int nfs3svc_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;
}

#define nfs3svc_decode_voidargs		NULL
#define nfs3svc_release_void		NULL
#define nfsd3_setaclres			nfsd3_attrstat
#define nfsd3_voidres			nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize)	\
 { (svc_procfunc) nfsd3_proc_##name,		\
   (kxdrproc_t) nfs3svc_decode_##argt##args,	\
   (kxdrproc_t) nfs3svc_encode_##rest##res,	\
   (kxdrproc_t) nfs3svc_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_procedures3[] = {
  PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
  PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),
  PROC(setacl,	setacl,		setacl,		fhandle,  RC_NOCACHE, ST+pAT),
};

struct svc_version	nfsd_acl_version3 = {
		.vs_vers	= 3,
		.vs_nproc	= 3,
		.vs_proc	= nfsd_acl_procedures3,
		.vs_dispatch	= nfsd_dispatch,
		.vs_xdrsize	= NFS3_SVC_XDRSIZE,
		.vs_hidden	= 0,
};
Commit	Line	Data
a257cdd0	1	/*
a257cdd0 AG	2	* Process version 3 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 RETURN_STATUS(st) { resp->status = (st); return (st); }
	16
	17	/*
	18	* NULL call.
	19	*/
7111c66e	20	static __be32
a257cdd0 AG	21	nfsd3_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	22	{
	23	return nfs_ok;
	24	}
	25
	26	/*
	27	* Get the Access and/or Default ACL of a file.
	28	*/
7111c66e	29	static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
a257cdd0 AG	30	struct nfsd3_getaclargs argp, struct nfsd3_getaclres resp)
a257cdd0 AG	31	{
a257cdd0	32	struct posix_acl *acl;
4ac7249e CH	33	struct inode *inode;
4ac7249e CH	34	svc_fh *fh;
c4d987ba	35	__be32 nfserr = 0;
a257cdd0 AG	36
a257cdd0 AG	37	fh = fh_copy(&resp->fh, &argp->fh);
8837abca MS	38	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
8837abca MS	39	if (nfserr)
ac8587dc	40	RETURN_STATUS(nfserr);
a257cdd0	41
2b0143b5	42	inode = d_inode(fh->fh_dentry);
4ac7249e	43
7b8f4586	44	if (argp->mask & ~NFS_ACL_MASK)
a257cdd0 AG	45	RETURN_STATUS(nfserr_inval);
	46	resp->mask = argp->mask;
	47
	48	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
4ac7249e	49	acl = get_acl(inode, ACL_TYPE_ACCESS);
a257cdd0 AG	50	if (acl == NULL) {
a257cdd0 AG	51	/* Solaris returns the inode's minimum ACL. */
a257cdd0 AG	52	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
a257cdd0 AG	53	}
35e634b8 KM	54	if (IS_ERR(acl)) {
	55	nfserr = nfserrno(PTR_ERR(acl));
	56	goto fail;
	57	}
a257cdd0 AG	58	resp->acl_access = acl;
	59	}
	60	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	61	/* Check how Solaris handles requests for the Default ACL
	62	of a non-directory! */
4ac7249e	63	acl = get_acl(inode, ACL_TYPE_DEFAULT);
a257cdd0	64	if (IS_ERR(acl)) {
4ac7249e CH	65	nfserr = nfserrno(PTR_ERR(acl));
4ac7249e CH	66	goto fail;
a257cdd0 AG	67	}
	68	resp->acl_default = acl;
	69	}
	70
	71	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
	72	RETURN_STATUS(0);
	73
	74	fail:
	75	posix_acl_release(resp->acl_access);
	76	posix_acl_release(resp->acl_default);
	77	RETURN_STATUS(nfserr);
	78	}
	79
	80	/*
	81	* Set the Access and/or Default ACL of a file.
	82	*/
7111c66e	83	static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
a257cdd0 AG	84	struct nfsd3_setaclargs *argp,
	85	struct nfsd3_attrstat *resp)
	86	{
4ac7249e	87	struct inode *inode;
a257cdd0	88	svc_fh *fh;
c4d987ba	89	__be32 nfserr = 0;
4ac7249e	90	int error;
a257cdd0 AG	91
a257cdd0 AG	92	fh = fh_copy(&resp->fh, &argp->fh);
8837abca	93	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
4ac7249e CH	94	if (nfserr)
4ac7249e CH	95	goto out;
a257cdd0	96
2b0143b5	97	inode = d_inode(fh->fh_dentry);
4ac7249e CH	98	if (!IS_POSIXACL(inode) \|\| !inode->i_op->set_acl) {
	99	error = -EOPNOTSUPP;
	100	goto out_errno;
a257cdd0 AG	101	}
a257cdd0 AG	102
4ac7249e CH	103	error = fh_want_write(fh);
	104	if (error)
	105	goto out_errno;
	106
	107	error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS);
	108	if (error)
	109	goto out_drop_write;
	110	error = inode->i_op->set_acl(inode, argp->acl_default,
	111	ACL_TYPE_DEFAULT);
	112
	113	out_drop_write:
	114	fh_drop_write(fh);
	115	out_errno:
	116	nfserr = nfserrno(error);
	117	out:
a257cdd0 AG	118	/* argp->acl_{access,default} may have been allocated in
	119	nfs3svc_decode_setaclargs. */
	120	posix_acl_release(argp->acl_access);
	121	posix_acl_release(argp->acl_default);
	122	RETURN_STATUS(nfserr);
	123	}
	124
	125	/*
	126	* XDR decode functions
	127	*/
91f07168	128	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	129	struct nfsd3_getaclargs *args)
a257cdd0 AG	130	{
d40aa337 BT	131	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	132	if (!p)
a257cdd0 AG	133	return 0;
	134	args->mask = ntohl(*p); p++;
	135
	136	return xdr_argsize_check(rqstp, p);
	137	}
	138
	139
91f07168	140	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	141	struct nfsd3_setaclargs *args)
	142	{
	143	struct kvec *head = rqstp->rq_arg.head;
	144	unsigned int base;
	145	int n;
	146
d40aa337 BT	147	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	148	if (!p)
a257cdd0 AG	149	return 0;
a257cdd0 AG	150	args->mask = ntohl(*p++);
7b8f4586	151	if (args->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	152	!xdr_argsize_check(rqstp, p))
	153	return 0;
	154
	155	base = (char )p - (char )head->iov_base;
	156	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	157	(args->mask & NFS_ACL) ?
	158	&args->acl_access : NULL);
	159	if (n > 0)
	160	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	161	(args->mask & NFS_DFACL) ?
	162	&args->acl_default : NULL);
	163	return (n > 0);
	164	}
	165
	166	/*
	167	* XDR encode functions
	168	*/
	169
	170	/* GETACL */
91f07168	171	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	172	struct nfsd3_getaclres *resp)
	173	{
	174	struct dentry *dentry = resp->fh.fh_dentry;
	175
	176	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
2b0143b5 DH	177	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
2b0143b5 DH	178	struct inode *inode = d_inode(dentry);
a257cdd0 AG	179	struct kvec *head = rqstp->rq_res.head;
	180	unsigned int base;
	181	int n;
14d2b59e	182	int w;
a257cdd0 AG	183
	184	*p++ = htonl(resp->mask);
	185	if (!xdr_ressize_check(rqstp, p))
	186	return 0;
	187	base = (char )p - (char )head->iov_base;
	188
14d2b59e JJ	189	rqstp->rq_res.page_len = w = nfsacl_size(
	190	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	191	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	192	while (w > 0) {
afc59400	193	if (!*(rqstp->rq_next_page++))
a257cdd0 AG	194	return 0;
	195	w -= PAGE_SIZE;
	196	}
	197
	198	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	199	resp->acl_access,
	200	resp->mask & NFS_ACL, 0);
	201	if (n > 0)
	202	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	203	resp->acl_default,
	204	resp->mask & NFS_DFACL,
	205	NFS_ACL_DEFAULT);
	206	if (n <= 0)
	207	return 0;
	208	} else
	209	if (!xdr_ressize_check(rqstp, p))
	210	return 0;
	211
	212	return 1;
	213	}
	214
	215	/* SETACL */
91f07168	216	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	217	struct nfsd3_attrstat *resp)
	218	{
	219	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	220
	221	return xdr_ressize_check(rqstp, p);
	222	}
	223
	224	/*
	225	* XDR release functions
	226	*/
91f07168	227	static int nfs3svc_release_getacl(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	228	struct nfsd3_getaclres *resp)
	229	{
	230	fh_put(&resp->fh);
	231	posix_acl_release(resp->acl_access);
	232	posix_acl_release(resp->acl_default);
	233	return 1;
	234	}
	235
	236	#define nfs3svc_decode_voidargs NULL
	237	#define nfs3svc_release_void NULL
	238	#define nfsd3_setaclres nfsd3_attrstat
	239	#define nfsd3_voidres nfsd3_voidargs
	240	struct nfsd3_voidargs { int dummy; };
	241
	242	#define PROC(name, argt, rest, relt, cache, respsize) \
	243	{ (svc_procfunc) nfsd3_proc_##name, \
	244	(kxdrproc_t) nfs3svc_decode_##argt##args, \
	245	(kxdrproc_t) nfs3svc_encode_##rest##res, \
	246	(kxdrproc_t) nfs3svc_release_##relt, \
	247	sizeof(struct nfsd3_##argt##args), \
	248	sizeof(struct nfsd3_##rest##res), \
	249	0, \
	250	cache, \
	251	respsize, \
	252	}
	253
	254	#define ST 1 /* status*/
	255	#define AT 21 /* attributes */
	256	#define pAT (1+AT) /* post attributes - conditional */
	257	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	258
	259	static struct svc_procedure nfsd_acl_procedures3[] = {
	260	PROC(null, void, void, void, RC_NOCACHE, ST),
	261	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
	262	PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
	263	};
	264
	265	struct svc_version nfsd_acl_version3 = {
	266	.vs_vers = 3,
	267	.vs_nproc = 3,
	268	.vs_proc = nfsd_acl_procedures3,
	269	.vs_dispatch = nfsd_dispatch,
	270	.vs_xdrsize = NFS3_SVC_XDRSIZE,
1b7e0403	271	.vs_hidden = 0,
a257cdd0 AG	272	};
a257cdd0 AG	273