[mirror_ubuntu-jammy-kernel.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(inode, NFS_INO_INVALID_CHANGE);
	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;
			fallthrough;
		case -ENOTSUPP:
			status = -EOPNOTSUPP;
			goto getout;
		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;
			fallthrough;
		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 user_namespace *mnt_userns, 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
1f3208b2	68	status = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
5c6a9f7d AG	69	if (status < 0)
5c6a9f7d AG	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;
df561f66	111	fallthrough;
b7fa0554 AG	112	case -ENOTSUPP:
b7fa0554 AG	113	status = -EOPNOTSUPP;
ffb81717	114	goto getout;
b7fa0554 AG	115	default:
	116	goto getout;
	117	}
	118	if ((args.mask & res.mask) != args.mask) {
	119	status = -EIO;
	120	goto getout;
	121	}
	122
	123	if (res.acl_access != NULL) {
718360c5	124	if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) \|\|
013cdf10	125	res.acl_access->a_count == 0) {
b7fa0554 AG	126	posix_acl_release(res.acl_access);
	127	res.acl_access = NULL;
	128	}
	129	}
	130
013cdf10	131	if (res.mask & NFS_ACL)
b8a7a3a6	132	nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
013cdf10 CH	133	else
013cdf10 CH	134	forget_cached_acl(inode, ACL_TYPE_ACCESS);
b7fa0554	135
013cdf10	136	if (res.mask & NFS_DFACL)
b8a7a3a6	137	nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
013cdf10 CH	138	else
	139	forget_cached_acl(inode, ACL_TYPE_DEFAULT);
	140
	141	nfs_free_fattr(res.fattr);
	142	if (type == ACL_TYPE_ACCESS) {
	143	posix_acl_release(res.acl_default);
	144	return res.acl_access;
	145	} else {
	146	posix_acl_release(res.acl_access);
	147	return res.acl_default;
b7fa0554 AG	148	}
	149
	150	getout:
b8a7a3a6 AG	151	nfs3_abort_get_acl(&inode->i_acl);
b8a7a3a6 AG	152	nfs3_abort_get_acl(&inode->i_default_acl);
b7fa0554 AG	153	posix_acl_release(res.acl_access);
b7fa0554 AG	154	posix_acl_release(res.acl_default);
6e94d629	155	nfs_free_fattr(res.fattr);
013cdf10	156	return ERR_PTR(status);
b7fa0554 AG	157	}
b7fa0554 AG	158
8f493b9c	159	static int __nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
013cdf10	160	struct posix_acl *dfacl)
b7fa0554 AG	161	{
b7fa0554 AG	162	struct nfs_server *server = NFS_SERVER(inode);
6e94d629	163	struct nfs_fattr *fattr;
ae46141f	164	struct page *pages[NFSACL_MAXPAGES];
b7fa0554 AG	165	struct nfs3_setaclargs args = {
	166	.inode = inode,
	167	.mask = NFS_ACL,
	168	.acl_access = acl,
	169	.pages = pages,
	170	};
dead28da CL	171	struct rpc_message msg = {
	172	.rpc_argp = &args,
	173	.rpc_resp = &fattr,
	174	};
f87d928f TM	175	int status = 0;
	176
	177	if (acl == NULL && (!S_ISDIR(inode->i_mode) \|\| dfacl == NULL))
	178	goto out;
b7fa0554 AG	179
	180	status = -EOPNOTSUPP;
	181	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	182	goto out;
	183
f61f6da0 CL	184	/* We are doing this here because XDR marshalling does not
f61f6da0 CL	185	* return any results, it BUGs. */
b7fa0554 AG	186	status = -ENOSPC;
	187	if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
	188	goto out;
	189	if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
	190	goto out;
	191	if (S_ISDIR(inode->i_mode)) {
	192	args.mask \|= NFS_DFACL;
	193	args.acl_default = dfacl;
ae46141f TM	194	args.len = nfsacl_size(acl, dfacl);
	195	} else
	196	args.len = nfsacl_size(acl, NULL);
	197
	198	if (args.len > NFS_ACL_INLINE_BUFSIZE) {
	199	unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
	200
	201	status = -ENOMEM;
	202	do {
	203	args.pages[args.npages] = alloc_page(GFP_KERNEL);
	204	if (args.pages[args.npages] == NULL)
	205	goto out_freepages;
	206	args.npages++;
	207	} while (args.npages < npages);
b7fa0554 AG	208	}
	209
	210	dprintk("NFS call setacl\n");
6e94d629 TM	211	status = -ENOMEM;
	212	fattr = nfs_alloc_fattr();
	213	if (fattr == NULL)
	214	goto out_freepages;
	215
dead28da	216	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
6e94d629	217	msg.rpc_resp = fattr;
dead28da	218	status = rpc_call_sync(server->client_acl, &msg, 0);
f41f7418 TM	219	nfs_access_zap_cache(inode);
f41f7418 TM	220	nfs_zap_acl_cache(inode);
b7fa0554 AG	221	dprintk("NFS reply setacl: %d\n", status);
b7fa0554 AG	222
b7fa0554 AG	223	switch (status) {
b7fa0554 AG	224	case 0:
6e94d629	225	status = nfs_refresh_inode(inode, fattr);
b7fa0554 AG	226	break;
	227	case -EPFNOSUPPORT:
	228	case -EPROTONOSUPPORT:
	229	dprintk("NFS_V3_ACL SETACL RPC not supported"
	230	"(will not retry)\n");
	231	server->caps &= ~NFS_CAP_ACLS;
df561f66	232	fallthrough;
b7fa0554 AG	233	case -ENOTSUPP:
	234	status = -EOPNOTSUPP;
	235	}
6e94d629	236	nfs_free_fattr(fattr);
ae46141f TM	237	out_freepages:
	238	while (args.npages != 0) {
	239	args.npages--;
	240	__free_page(args.pages[args.npages]);
	241	}
b7fa0554 AG	242	out:
	243	return status;
	244	}
	245
8f493b9c TM	246	int nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
	247	struct posix_acl *dfacl)
	248	{
	249	int ret;
	250	ret = __nfs3_proc_setacls(inode, acl, dfacl);
	251	return (ret == -EOPNOTSUPP) ? 0 : ret;
	252
	253	}
	254
549c7297 CB	255	int nfs3_set_acl(struct user_namespace mnt_userns, struct inode inode,
549c7297 CB	256	struct posix_acl *acl, int type)
b7fa0554	257	{
7648f939	258	struct posix_acl orig = acl, dfacl = NULL, *alloc;
b7fa0554 AG	259	int status;
	260
	261	if (S_ISDIR(inode->i_mode)) {
	262	switch(type) {
013cdf10	263	case ACL_TYPE_ACCESS:
7648f939	264	alloc = get_acl(inode, ACL_TYPE_DEFAULT);
013cdf10 CH	265	if (IS_ERR(alloc))
013cdf10 CH	266	goto fail;
7648f939	267	dfacl = alloc;
013cdf10 CH	268	break;
	269
	270	case ACL_TYPE_DEFAULT:
7648f939	271	alloc = get_acl(inode, ACL_TYPE_ACCESS);
013cdf10 CH	272	if (IS_ERR(alloc))
013cdf10 CH	273	goto fail;
7648f939 AG	274	dfacl = acl;
7648f939 AG	275	acl = alloc;
013cdf10	276	break;
b7fa0554	277	}
013cdf10	278	}
b7fa0554 AG	279
b7fa0554 AG	280	if (acl == NULL) {
7648f939	281	alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
b7fa0554 AG	282	if (IS_ERR(alloc))
b7fa0554 AG	283	goto fail;
7648f939	284	acl = alloc;
b7fa0554	285	}
8f493b9c	286	status = __nfs3_proc_setacls(inode, acl, dfacl);
7648f939 AG	287	out:
	288	if (acl != orig)
	289	posix_acl_release(acl);
	290	if (dfacl != orig)
	291	posix_acl_release(dfacl);
b7fa0554 AG	292	return status;
	293
	294	fail:
7648f939 AG	295	status = PTR_ERR(alloc);
7648f939 AG	296	goto out;
b7fa0554	297	}
055ffbea	298
013cdf10 CH	299	const struct xattr_handler *nfs3_xattr_handlers[] = {
	300	&posix_acl_access_xattr_handler,
	301	&posix_acl_default_xattr_handler,
	302	NULL,
	303	};
74adf83f CH	304
	305	static int
	306	nfs3_list_one_acl(struct inode inode, int type, const char name, void *data,
	307	size_t size, ssize_t *result)
	308	{
	309	struct posix_acl *acl;
	310	char p = data + result;
	311
	312	acl = get_acl(inode, type);
7a9e75a1	313	if (IS_ERR_OR_NULL(acl))
74adf83f CH	314	return 0;
	315
	316	posix_acl_release(acl);
	317
	318	*result += strlen(name);
	319	*result += 1;
	320	if (!size)
	321	return 0;
	322	if (*result > size)
	323	return -ERANGE;
	324
	325	strcpy(p, name);
	326	return 0;
	327	}
	328
	329	ssize_t
	330	nfs3_listxattr(struct dentry dentry, char data, size_t size)
	331	{
2b0143b5	332	struct inode *inode = d_inode(dentry);
74adf83f CH	333	ssize_t result = 0;
	334	int error;
	335
	336	error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
97d79299	337	XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
74adf83f CH	338	if (error)
	339	return error;
	340
	341	error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
97d79299	342	XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
74adf83f CH	343	if (error)
	344	return error;
	345	return result;
	346	}