[thirdparty/linux.git] / fs / nfs / nfs3acl.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/posix_acl_xattr.h>
#include <linux/nfsacl.h>

#include "internal.h"
#include "nfs3_fs.h"

#define NFSDBG_FACILITY	NFSDBG_PROC

/*
 * nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for
 * caching get_acl results in a race-free way.  See fs/posix_acl.c:get_acl()
 * for explanations.
 */
static void nfs3_prepare_get_acl(struct posix_acl **p)
{
	struct posix_acl *sentinel = uncached_acl_sentinel(current);

	if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
		/* Not the first reader or sentinel already in place. */
	}
}

static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
{
	struct posix_acl *sentinel = uncached_acl_sentinel(current);

	/* Only cache the ACL if our sentinel is still in place. */
	posix_acl_dup(acl);
	if (cmpxchg(p, sentinel, acl) != sentinel)
		posix_acl_release(acl);
}

static void nfs3_abort_get_acl(struct posix_acl **p)
{
	struct posix_acl *sentinel = uncached_acl_sentinel(current);

	/* Remove our sentinel upon failure. */
	cmpxchg(p, sentinel, ACL_NOT_CACHED);
}

struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct page *pages[NFSACL_MAXPAGES] = { };
	struct nfs3_getaclargs args = {
		.fh = NFS_FH(inode),
		/* The xdr layer may allocate pages here. */
		.pages = pages,
	};
	struct nfs3_getaclres res = {
		NULL,
	};
	struct rpc_message msg = {
		.rpc_argp	= &args,
		.rpc_resp	= &res,
	};
	int status, count;

	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
		return ERR_PTR(-EOPNOTSUPP);

	status = nfs_revalidate_inode(server, inode);
	if (status < 0)
		return ERR_PTR(status);

	/*
	 * Only get the access acl when explicitly requested: We don't
	 * need it for access decisions, and only some applications use
	 * it. Applications which request the access acl first are not
	 * penalized from this optimization.
	 */
	if (type == ACL_TYPE_ACCESS)
		args.mask |= NFS_ACLCNT|NFS_ACL;
	if (S_ISDIR(inode->i_mode))
		args.mask |= NFS_DFACLCNT|NFS_DFACL;
	if (args.mask == 0)
		return NULL;

	dprintk("NFS call getacl\n");
	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
	res.fattr = nfs_alloc_fattr();
	if (res.fattr == NULL)
		return ERR_PTR(-ENOMEM);

	if (args.mask & NFS_ACL)
		nfs3_prepare_get_acl(&inode->i_acl);
	if (args.mask & NFS_DFACL)
		nfs3_prepare_get_acl(&inode->i_default_acl);

	status = rpc_call_sync(server->client_acl, &msg, 0);
	dprintk("NFS reply getacl: %d\n", status);

	/* pages may have been allocated at the xdr layer. */
	for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
		__free_page(args.pages[count]);

	switch (status) {
		case 0:
			status = nfs_refresh_inode(inode, res.fattr);
			break;
		case -EPFNOSUPPORT:
		case -EPROTONOSUPPORT:
			dprintk("NFS_V3_ACL extension not supported; disabling\n");
			server->caps &= ~NFS_CAP_ACLS;
			/* fall through */
		case -ENOTSUPP:
			status = -EOPNOTSUPP;
		default:
			goto getout;
	}
	if ((args.mask & res.mask) != args.mask) {
		status = -EIO;
		goto getout;
	}

	if (res.acl_access != NULL) {
		if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
		    res.acl_access->a_count == 0) {
			posix_acl_release(res.acl_access);
			res.acl_access = NULL;
		}
	}

	if (res.mask & NFS_ACL)
		nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
	else
		forget_cached_acl(inode, ACL_TYPE_ACCESS);

	if (res.mask & NFS_DFACL)
		nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
	else
		forget_cached_acl(inode, ACL_TYPE_DEFAULT);

	nfs_free_fattr(res.fattr);
	if (type == ACL_TYPE_ACCESS) {
		posix_acl_release(res.acl_default);
		return res.acl_access;
	} else {
		posix_acl_release(res.acl_access);
		return res.acl_default;
	}

getout:
	nfs3_abort_get_acl(&inode->i_acl);
	nfs3_abort_get_acl(&inode->i_default_acl);
	posix_acl_release(res.acl_access);
	posix_acl_release(res.acl_default);
	nfs_free_fattr(res.fattr);
	return ERR_PTR(status);
}

static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
		struct posix_acl *dfacl)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs_fattr *fattr;
	struct page *pages[NFSACL_MAXPAGES];
	struct nfs3_setaclargs args = {
		.inode = inode,
		.mask = NFS_ACL,
		.acl_access = acl,
		.pages = pages,
	};
	struct rpc_message msg = {
		.rpc_argp	= &args,
		.rpc_resp	= &fattr,
	};
	int status = 0;

	if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
		goto out;

	status = -EOPNOTSUPP;
	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
		goto out;

	/* We are doing this here because XDR marshalling does not
	 * return any results, it BUGs. */
	status = -ENOSPC;
	if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
		goto out;
	if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
		goto out;
	if (S_ISDIR(inode->i_mode)) {
		args.mask |= NFS_DFACL;
		args.acl_default = dfacl;
		args.len = nfsacl_size(acl, dfacl);
	} else
		args.len = nfsacl_size(acl, NULL);

	if (args.len > NFS_ACL_INLINE_BUFSIZE) {
		unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);

		status = -ENOMEM;
		do {
			args.pages[args.npages] = alloc_page(GFP_KERNEL);
			if (args.pages[args.npages] == NULL)
				goto out_freepages;
			args.npages++;
		} while (args.npages < npages);
	}

	dprintk("NFS call setacl\n");
	status = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto out_freepages;

	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
	msg.rpc_resp = fattr;
	status = rpc_call_sync(server->client_acl, &msg, 0);
	nfs_access_zap_cache(inode);
	nfs_zap_acl_cache(inode);
	dprintk("NFS reply setacl: %d\n", status);

	switch (status) {
		case 0:
			status = nfs_refresh_inode(inode, fattr);
			break;
		case -EPFNOSUPPORT:
		case -EPROTONOSUPPORT:
			dprintk("NFS_V3_ACL SETACL RPC not supported"
					"(will not retry)\n");
			server->caps &= ~NFS_CAP_ACLS;
			/* fall through */
		case -ENOTSUPP:
			status = -EOPNOTSUPP;
	}
	nfs_free_fattr(fattr);
out_freepages:
	while (args.npages != 0) {
		args.npages--;
		__free_page(args.pages[args.npages]);
	}
out:
	return status;
}

int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
		struct posix_acl *dfacl)
{
	int ret;
	ret = __nfs3_proc_setacls(inode, acl, dfacl);
	return (ret == -EOPNOTSUPP) ? 0 : ret;

}

int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
	int status;

	if (S_ISDIR(inode->i_mode)) {
		switch(type) {
		case ACL_TYPE_ACCESS:
			alloc = get_acl(inode, ACL_TYPE_DEFAULT);
			if (IS_ERR(alloc))
				goto fail;
			dfacl = alloc;
			break;

		case ACL_TYPE_DEFAULT:
			alloc = get_acl(inode, ACL_TYPE_ACCESS);
			if (IS_ERR(alloc))
				goto fail;
			dfacl = acl;
			acl = alloc;
			break;
		}
	}

	if (acl == NULL) {
		alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
		if (IS_ERR(alloc))
			goto fail;
		acl = alloc;
	}
	status = __nfs3_proc_setacls(inode, acl, dfacl);
out:
	if (acl != orig)
		posix_acl_release(acl);
	if (dfacl != orig)
		posix_acl_release(dfacl);
	return status;

fail:
	status = PTR_ERR(alloc);
	goto out;
}

const struct xattr_handler *nfs3_xattr_handlers[] = {
	&posix_acl_access_xattr_handler,
	&posix_acl_default_xattr_handler,
	NULL,
};

static int
nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
		size_t size, ssize_t *result)
{
	struct posix_acl *acl;
	char *p = data + *result;

	acl = get_acl(inode, type);
	if (IS_ERR_OR_NULL(acl))
		return 0;

	posix_acl_release(acl);

	*result += strlen(name);
	*result += 1;
	if (!size)
		return 0;
	if (*result > size)
		return -ERANGE;

	strcpy(p, name);
	return 0;
}

ssize_t
nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
{
	struct inode *inode = d_inode(dentry);
	ssize_t result = 0;
	int error;

	error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
			XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
	if (error)
		return error;

	error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
			XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
	if (error)
		return error;
	return result;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
b7fa0554	2	#include <linux/fs.h>
5a0e3ad6	3	#include <linux/gfp.h>
b7fa0554 AG	4	#include <linux/nfs.h>
	5	#include <linux/nfs3.h>
	6	#include <linux/nfs_fs.h>
334a13ec	7	#include <linux/posix_acl_xattr.h>
b7fa0554 AG	8	#include <linux/nfsacl.h>
b7fa0554 AG	9
f41f7418	10	#include "internal.h"
3fc3edf1	11	#include "nfs3_fs.h"
f41f7418	12
b7fa0554 AG	13	#define NFSDBG_FACILITY NFSDBG_PROC
b7fa0554 AG	14
b8a7a3a6 AG	15	/*
	16	* nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for
	17	* caching get_acl results in a race-free way. See fs/posix_acl.c:get_acl()
	18	* for explanations.
	19	*/
	20	static void nfs3_prepare_get_acl(struct posix_acl **p)
	21	{
	22	struct posix_acl *sentinel = uncached_acl_sentinel(current);
	23
	24	if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
	25	/* Not the first reader or sentinel already in place. */
	26	}
	27	}
	28
	29	static void nfs3_complete_get_acl(struct posix_acl *p, struct posix_acl acl)
	30	{
	31	struct posix_acl *sentinel = uncached_acl_sentinel(current);
	32
	33	/* Only cache the ACL if our sentinel is still in place. */
	34	posix_acl_dup(acl);
	35	if (cmpxchg(p, sentinel, acl) != sentinel)
	36	posix_acl_release(acl);
	37	}
	38
	39	static void nfs3_abort_get_acl(struct posix_acl **p)
	40	{
	41	struct posix_acl *sentinel = uncached_acl_sentinel(current);
	42
	43	/* Remove our sentinel upon failure. */
	44	cmpxchg(p, sentinel, ACL_NOT_CACHED);
	45	}
	46
013cdf10	47	struct posix_acl nfs3_get_acl(struct inode inode, int type)
b7fa0554 AG	48	{
b7fa0554 AG	49	struct nfs_server *server = NFS_SERVER(inode);
b7fa0554 AG	50	struct page *pages[NFSACL_MAXPAGES] = { };
	51	struct nfs3_getaclargs args = {
	52	.fh = NFS_FH(inode),
	53	/* The xdr layer may allocate pages here. */
	54	.pages = pages,
	55	};
	56	struct nfs3_getaclres res = {
17280175	57	NULL,
b7fa0554	58	};
dead28da CL	59	struct rpc_message msg = {
	60	.rpc_argp = &args,
	61	.rpc_resp = &res,
	62	};
b7fa0554 AG	63	int status, count;
	64
	65	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	66	return ERR_PTR(-EOPNOTSUPP);
	67
5c6a9f7d AG	68	status = nfs_revalidate_inode(server, inode);
	69	if (status < 0)
	70	return ERR_PTR(status);
b7fa0554	71
5c6a9f7d AG	72	/*
	73	* Only get the access acl when explicitly requested: We don't
	74	* need it for access decisions, and only some applications use
	75	* it. Applications which request the access acl first are not
	76	* penalized from this optimization.
	77	*/
	78	if (type == ACL_TYPE_ACCESS)
	79	args.mask \|= NFS_ACLCNT\|NFS_ACL;
	80	if (S_ISDIR(inode->i_mode))
	81	args.mask \|= NFS_DFACLCNT\|NFS_DFACL;
	82	if (args.mask == 0)
	83	return NULL;
b7fa0554 AG	84
b7fa0554 AG	85	dprintk("NFS call getacl\n");
dead28da	86	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
6e94d629 TM	87	res.fattr = nfs_alloc_fattr();
	88	if (res.fattr == NULL)
	89	return ERR_PTR(-ENOMEM);
	90
b8a7a3a6 AG	91	if (args.mask & NFS_ACL)
	92	nfs3_prepare_get_acl(&inode->i_acl);
	93	if (args.mask & NFS_DFACL)
	94	nfs3_prepare_get_acl(&inode->i_default_acl);
	95
dead28da	96	status = rpc_call_sync(server->client_acl, &msg, 0);
b7fa0554 AG	97	dprintk("NFS reply getacl: %d\n", status);
	98
	99	/* pages may have been allocated at the xdr layer. */
	100	for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
	101	__free_page(args.pages[count]);
	102
	103	switch (status) {
	104	case 0:
6e94d629	105	status = nfs_refresh_inode(inode, res.fattr);
b7fa0554 AG	106	break;
	107	case -EPFNOSUPPORT:
	108	case -EPROTONOSUPPORT:
	109	dprintk("NFS_V3_ACL extension not supported; disabling\n");
	110	server->caps &= ~NFS_CAP_ACLS;
01e03bdc	111	/* fall through */
b7fa0554 AG	112	case -ENOTSUPP:
	113	status = -EOPNOTSUPP;
	114	default:
	115	goto getout;
	116	}
	117	if ((args.mask & res.mask) != args.mask) {
	118	status = -EIO;
	119	goto getout;
	120	}
	121
	122	if (res.acl_access != NULL) {
718360c5	123	if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) \|\|
013cdf10	124	res.acl_access->a_count == 0) {
b7fa0554 AG	125	posix_acl_release(res.acl_access);
	126	res.acl_access = NULL;
	127	}
	128	}
	129
013cdf10	130	if (res.mask & NFS_ACL)
b8a7a3a6	131	nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
013cdf10 CH	132	else
013cdf10 CH	133	forget_cached_acl(inode, ACL_TYPE_ACCESS);
b7fa0554	134
013cdf10	135	if (res.mask & NFS_DFACL)
b8a7a3a6	136	nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
013cdf10 CH	137	else
	138	forget_cached_acl(inode, ACL_TYPE_DEFAULT);
	139
	140	nfs_free_fattr(res.fattr);
	141	if (type == ACL_TYPE_ACCESS) {
	142	posix_acl_release(res.acl_default);
	143	return res.acl_access;
	144	} else {
	145	posix_acl_release(res.acl_access);
	146	return res.acl_default;
b7fa0554 AG	147	}
	148
	149	getout:
b8a7a3a6 AG	150	nfs3_abort_get_acl(&inode->i_acl);
b8a7a3a6 AG	151	nfs3_abort_get_acl(&inode->i_default_acl);
b7fa0554 AG	152	posix_acl_release(res.acl_access);
b7fa0554 AG	153	posix_acl_release(res.acl_default);
6e94d629	154	nfs_free_fattr(res.fattr);
013cdf10	155	return ERR_PTR(status);
b7fa0554 AG	156	}
b7fa0554 AG	157
8f493b9c	158	static int __nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
013cdf10	159	struct posix_acl *dfacl)
b7fa0554 AG	160	{
b7fa0554 AG	161	struct nfs_server *server = NFS_SERVER(inode);
6e94d629	162	struct nfs_fattr *fattr;
ae46141f	163	struct page *pages[NFSACL_MAXPAGES];
b7fa0554 AG	164	struct nfs3_setaclargs args = {
	165	.inode = inode,
	166	.mask = NFS_ACL,
	167	.acl_access = acl,
	168	.pages = pages,
	169	};
dead28da CL	170	struct rpc_message msg = {
	171	.rpc_argp = &args,
	172	.rpc_resp = &fattr,
	173	};
f87d928f TM	174	int status = 0;
	175
	176	if (acl == NULL && (!S_ISDIR(inode->i_mode) \|\| dfacl == NULL))
	177	goto out;
b7fa0554 AG	178
	179	status = -EOPNOTSUPP;
	180	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	181	goto out;
	182
f61f6da0 CL	183	/* We are doing this here because XDR marshalling does not
f61f6da0 CL	184	* return any results, it BUGs. */
b7fa0554 AG	185	status = -ENOSPC;
	186	if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
	187	goto out;
	188	if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
	189	goto out;
	190	if (S_ISDIR(inode->i_mode)) {
	191	args.mask \|= NFS_DFACL;
	192	args.acl_default = dfacl;
ae46141f TM	193	args.len = nfsacl_size(acl, dfacl);
	194	} else
	195	args.len = nfsacl_size(acl, NULL);
	196
	197	if (args.len > NFS_ACL_INLINE_BUFSIZE) {
	198	unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
	199
	200	status = -ENOMEM;
	201	do {
	202	args.pages[args.npages] = alloc_page(GFP_KERNEL);
	203	if (args.pages[args.npages] == NULL)
	204	goto out_freepages;
	205	args.npages++;
	206	} while (args.npages < npages);
b7fa0554 AG	207	}
	208
	209	dprintk("NFS call setacl\n");
6e94d629 TM	210	status = -ENOMEM;
	211	fattr = nfs_alloc_fattr();
	212	if (fattr == NULL)
	213	goto out_freepages;
	214
dead28da	215	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
6e94d629	216	msg.rpc_resp = fattr;
dead28da	217	status = rpc_call_sync(server->client_acl, &msg, 0);
f41f7418 TM	218	nfs_access_zap_cache(inode);
f41f7418 TM	219	nfs_zap_acl_cache(inode);
b7fa0554 AG	220	dprintk("NFS reply setacl: %d\n", status);
b7fa0554 AG	221
b7fa0554 AG	222	switch (status) {
b7fa0554 AG	223	case 0:
6e94d629	224	status = nfs_refresh_inode(inode, fattr);
b7fa0554 AG	225	break;
	226	case -EPFNOSUPPORT:
	227	case -EPROTONOSUPPORT:
	228	dprintk("NFS_V3_ACL SETACL RPC not supported"
	229	"(will not retry)\n");
	230	server->caps &= ~NFS_CAP_ACLS;
01e03bdc	231	/* fall through */
b7fa0554 AG	232	case -ENOTSUPP:
	233	status = -EOPNOTSUPP;
	234	}
6e94d629	235	nfs_free_fattr(fattr);
ae46141f TM	236	out_freepages:
	237	while (args.npages != 0) {
	238	args.npages--;
	239	__free_page(args.pages[args.npages]);
	240	}
b7fa0554 AG	241	out:
	242	return status;
	243	}
	244
8f493b9c TM	245	int nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
	246	struct posix_acl *dfacl)
	247	{
	248	int ret;
	249	ret = __nfs3_proc_setacls(inode, acl, dfacl);
	250	return (ret == -EOPNOTSUPP) ? 0 : ret;
	251
	252	}
	253
013cdf10	254	int nfs3_set_acl(struct inode inode, struct posix_acl acl, int type)
b7fa0554	255	{
7648f939	256	struct posix_acl orig = acl, dfacl = NULL, *alloc;
b7fa0554 AG	257	int status;
	258
	259	if (S_ISDIR(inode->i_mode)) {
	260	switch(type) {
013cdf10	261	case ACL_TYPE_ACCESS:
7648f939	262	alloc = get_acl(inode, ACL_TYPE_DEFAULT);
013cdf10 CH	263	if (IS_ERR(alloc))
013cdf10 CH	264	goto fail;
7648f939	265	dfacl = alloc;
013cdf10 CH	266	break;
	267
	268	case ACL_TYPE_DEFAULT:
7648f939	269	alloc = get_acl(inode, ACL_TYPE_ACCESS);
013cdf10 CH	270	if (IS_ERR(alloc))
013cdf10 CH	271	goto fail;
7648f939 AG	272	dfacl = acl;
7648f939 AG	273	acl = alloc;
013cdf10	274	break;
b7fa0554	275	}
013cdf10	276	}
b7fa0554 AG	277
b7fa0554 AG	278	if (acl == NULL) {
7648f939	279	alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
b7fa0554 AG	280	if (IS_ERR(alloc))
b7fa0554 AG	281	goto fail;
7648f939	282	acl = alloc;
b7fa0554	283	}
8f493b9c	284	status = __nfs3_proc_setacls(inode, acl, dfacl);
7648f939 AG	285	out:
	286	if (acl != orig)
	287	posix_acl_release(acl);
	288	if (dfacl != orig)
	289	posix_acl_release(dfacl);
b7fa0554 AG	290	return status;
	291
	292	fail:
7648f939 AG	293	status = PTR_ERR(alloc);
7648f939 AG	294	goto out;
b7fa0554	295	}
055ffbea	296
013cdf10 CH	297	const struct xattr_handler *nfs3_xattr_handlers[] = {
	298	&posix_acl_access_xattr_handler,
	299	&posix_acl_default_xattr_handler,
	300	NULL,
	301	};
74adf83f CH	302
	303	static int
	304	nfs3_list_one_acl(struct inode inode, int type, const char name, void *data,
	305	size_t size, ssize_t *result)
	306	{
	307	struct posix_acl *acl;
	308	char p = data + result;
	309
	310	acl = get_acl(inode, type);
7a9e75a1	311	if (IS_ERR_OR_NULL(acl))
74adf83f CH	312	return 0;
	313
	314	posix_acl_release(acl);
	315
	316	*result += strlen(name);
	317	*result += 1;
	318	if (!size)
	319	return 0;
	320	if (*result > size)
	321	return -ERANGE;
	322
	323	strcpy(p, name);
	324	return 0;
	325	}
	326
	327	ssize_t
	328	nfs3_listxattr(struct dentry dentry, char data, size_t size)
	329	{
2b0143b5	330	struct inode *inode = d_inode(dentry);
74adf83f CH	331	ssize_t result = 0;
	332	int error;
	333
	334	error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
97d79299	335	XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
74adf83f CH	336	if (error)
	337	return error;
	338
	339	error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
97d79299	340	XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
74adf83f CH	341	if (error)
	342	return error;
	343	return result;
	344	}