[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);

	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);

out_drop_lock:
	fh_unlock(fh);
	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);
a257cdd0	98
4ac7249e CH	99	error = fh_want_write(fh);
	100	if (error)
	101	goto out_errno;
	102
99965378 BH	103	fh_lock(fh);
	104
	105	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
4ac7249e	106	if (error)
99965378 BH	107	goto out_drop_lock;
99965378 BH	108	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
4ac7249e	109
99965378 BH	110	out_drop_lock:
99965378 BH	111	fh_unlock(fh);
4ac7249e CH	112	fh_drop_write(fh);
	113	out_errno:
	114	nfserr = nfserrno(error);
	115	out:
a257cdd0 AG	116	/* argp->acl_{access,default} may have been allocated in
	117	nfs3svc_decode_setaclargs. */
	118	posix_acl_release(argp->acl_access);
	119	posix_acl_release(argp->acl_default);
	120	RETURN_STATUS(nfserr);
	121	}
	122
	123	/*
	124	* XDR decode functions
	125	*/
91f07168	126	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	127	struct nfsd3_getaclargs *args)
a257cdd0 AG	128	{
d40aa337 BT	129	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	130	if (!p)
a257cdd0 AG	131	return 0;
	132	args->mask = ntohl(*p); p++;
	133
	134	return xdr_argsize_check(rqstp, p);
	135	}
	136
	137
91f07168	138	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	139	struct nfsd3_setaclargs *args)
	140	{
	141	struct kvec *head = rqstp->rq_arg.head;
	142	unsigned int base;
	143	int n;
	144
d40aa337 BT	145	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	146	if (!p)
a257cdd0 AG	147	return 0;
a257cdd0 AG	148	args->mask = ntohl(*p++);
7b8f4586	149	if (args->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	150	!xdr_argsize_check(rqstp, p))
	151	return 0;
	152
	153	base = (char )p - (char )head->iov_base;
	154	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	155	(args->mask & NFS_ACL) ?
	156	&args->acl_access : NULL);
	157	if (n > 0)
	158	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	159	(args->mask & NFS_DFACL) ?
	160	&args->acl_default : NULL);
	161	return (n > 0);
	162	}
	163
	164	/*
	165	* XDR encode functions
	166	*/
	167
	168	/* GETACL */
91f07168	169	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	170	struct nfsd3_getaclres *resp)
	171	{
	172	struct dentry *dentry = resp->fh.fh_dentry;
	173
	174	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
2b0143b5 DH	175	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
2b0143b5 DH	176	struct inode *inode = d_inode(dentry);
a257cdd0 AG	177	struct kvec *head = rqstp->rq_res.head;
	178	unsigned int base;
	179	int n;
14d2b59e	180	int w;
a257cdd0 AG	181
	182	*p++ = htonl(resp->mask);
	183	if (!xdr_ressize_check(rqstp, p))
	184	return 0;
	185	base = (char )p - (char )head->iov_base;
	186
14d2b59e JJ	187	rqstp->rq_res.page_len = w = nfsacl_size(
	188	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	189	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	190	while (w > 0) {
afc59400	191	if (!*(rqstp->rq_next_page++))
a257cdd0 AG	192	return 0;
	193	w -= PAGE_SIZE;
	194	}
	195
	196	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	197	resp->acl_access,
	198	resp->mask & NFS_ACL, 0);
	199	if (n > 0)
	200	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	201	resp->acl_default,
	202	resp->mask & NFS_DFACL,
	203	NFS_ACL_DEFAULT);
	204	if (n <= 0)
	205	return 0;
	206	} else
	207	if (!xdr_ressize_check(rqstp, p))
	208	return 0;
	209
	210	return 1;
	211	}
	212
	213	/* SETACL */
91f07168	214	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	215	struct nfsd3_attrstat *resp)
	216	{
	217	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	218
	219	return xdr_ressize_check(rqstp, p);
	220	}
	221
	222	/*
	223	* XDR release functions
	224	*/
91f07168	225	static int nfs3svc_release_getacl(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	226	struct nfsd3_getaclres *resp)
	227	{
	228	fh_put(&resp->fh);
	229	posix_acl_release(resp->acl_access);
	230	posix_acl_release(resp->acl_default);
	231	return 1;
	232	}
	233
	234	#define nfs3svc_decode_voidargs NULL
	235	#define nfs3svc_release_void NULL
	236	#define nfsd3_setaclres nfsd3_attrstat
	237	#define nfsd3_voidres nfsd3_voidargs
	238	struct nfsd3_voidargs { int dummy; };
	239
	240	#define PROC(name, argt, rest, relt, cache, respsize) \
	241	{ (svc_procfunc) nfsd3_proc_##name, \
	242	(kxdrproc_t) nfs3svc_decode_##argt##args, \
	243	(kxdrproc_t) nfs3svc_encode_##rest##res, \
	244	(kxdrproc_t) nfs3svc_release_##relt, \
	245	sizeof(struct nfsd3_##argt##args), \
	246	sizeof(struct nfsd3_##rest##res), \
	247	0, \
	248	cache, \
	249	respsize, \
	250	}
	251
	252	#define ST 1 /* status*/
	253	#define AT 21 /* attributes */
	254	#define pAT (1+AT) /* post attributes - conditional */
	255	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	256
	257	static struct svc_procedure nfsd_acl_procedures3[] = {
	258	PROC(null, void, void, void, RC_NOCACHE, ST),
	259	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
	260	PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
	261	};
	262
	263	struct svc_version nfsd_acl_version3 = {
	264	.vs_vers = 3,
	265	.vs_nproc = 3,
	266	.vs_proc = nfsd_acl_procedures3,
	267	.vs_dispatch = nfsd_dispatch,
	268	.vs_xdrsize = NFS3_SVC_XDRSIZE,
1b7e0403	269	.vs_hidden = 0,
a257cdd0 AG	270	};
a257cdd0 AG	271