[linux-block.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 the ACL isn't being read yet, set our sentinel. */
	cmpxchg(p, ACL_NOT_CACHED, sentinel);
}

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, bool rcu)
{
	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 (rcu)
		return ERR_PTR(-ECHILD);

	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 mnt_idmap *idmap, struct dentry *dentry,
		 struct posix_acl *acl, int type)
{
	struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
	struct inode *inode = d_inode(dentry);
	int status;

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

		case ACL_TYPE_DEFAULT:
			alloc = get_inode_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;
}

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_inode_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
f9641a36 UB	24	/* If the ACL isn't being read yet, set our sentinel. */
f9641a36 UB	25	cmpxchg(p, ACL_NOT_CACHED, sentinel);
b8a7a3a6 AG	26	}
	27
	28	static void nfs3_complete_get_acl(struct posix_acl *p, struct posix_acl acl)
	29	{
	30	struct posix_acl *sentinel = uncached_acl_sentinel(current);
	31
	32	/* Only cache the ACL if our sentinel is still in place. */
	33	posix_acl_dup(acl);
	34	if (cmpxchg(p, sentinel, acl) != sentinel)
	35	posix_acl_release(acl);
	36	}
	37
	38	static void nfs3_abort_get_acl(struct posix_acl **p)
	39	{
	40	struct posix_acl *sentinel = uncached_acl_sentinel(current);
	41
	42	/* Remove our sentinel upon failure. */
	43	cmpxchg(p, sentinel, ACL_NOT_CACHED);
	44	}
	45
0cad6246	46	struct posix_acl nfs3_get_acl(struct inode inode, int type, bool rcu)
b7fa0554 AG	47	{
b7fa0554 AG	48	struct nfs_server *server = NFS_SERVER(inode);
b7fa0554 AG	49	struct page *pages[NFSACL_MAXPAGES] = { };
	50	struct nfs3_getaclargs args = {
	51	.fh = NFS_FH(inode),
	52	/* The xdr layer may allocate pages here. */
	53	.pages = pages,
	54	};
	55	struct nfs3_getaclres res = {
17280175	56	NULL,
b7fa0554	57	};
dead28da CL	58	struct rpc_message msg = {
	59	.rpc_argp = &args,
	60	.rpc_resp = &res,
	61	};
b7fa0554 AG	62	int status, count;
b7fa0554 AG	63
0cad6246 MS	64	if (rcu)
	65	return ERR_PTR(-ECHILD);
	66
b7fa0554 AG	67	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	68	return ERR_PTR(-EOPNOTSUPP);
	69
1f3208b2	70	status = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
5c6a9f7d AG	71	if (status < 0)
5c6a9f7d AG	72	return ERR_PTR(status);
b7fa0554	73
5c6a9f7d AG	74	/*
	75	* Only get the access acl when explicitly requested: We don't
	76	* need it for access decisions, and only some applications use
	77	* it. Applications which request the access acl first are not
	78	* penalized from this optimization.
	79	*/
	80	if (type == ACL_TYPE_ACCESS)
	81	args.mask \|= NFS_ACLCNT\|NFS_ACL;
	82	if (S_ISDIR(inode->i_mode))
	83	args.mask \|= NFS_DFACLCNT\|NFS_DFACL;
	84	if (args.mask == 0)
	85	return NULL;
b7fa0554 AG	86
b7fa0554 AG	87	dprintk("NFS call getacl\n");
dead28da	88	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
6e94d629 TM	89	res.fattr = nfs_alloc_fattr();
	90	if (res.fattr == NULL)
	91	return ERR_PTR(-ENOMEM);
	92
b8a7a3a6 AG	93	if (args.mask & NFS_ACL)
	94	nfs3_prepare_get_acl(&inode->i_acl);
	95	if (args.mask & NFS_DFACL)
	96	nfs3_prepare_get_acl(&inode->i_default_acl);
	97
dead28da	98	status = rpc_call_sync(server->client_acl, &msg, 0);
b7fa0554 AG	99	dprintk("NFS reply getacl: %d\n", status);
	100
	101	/* pages may have been allocated at the xdr layer. */
	102	for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
	103	__free_page(args.pages[count]);
	104
	105	switch (status) {
	106	case 0:
6e94d629	107	status = nfs_refresh_inode(inode, res.fattr);
b7fa0554 AG	108	break;
	109	case -EPFNOSUPPORT:
	110	case -EPROTONOSUPPORT:
	111	dprintk("NFS_V3_ACL extension not supported; disabling\n");
	112	server->caps &= ~NFS_CAP_ACLS;
df561f66	113	fallthrough;
b7fa0554 AG	114	case -ENOTSUPP:
b7fa0554 AG	115	status = -EOPNOTSUPP;
ffb81717	116	goto getout;
b7fa0554 AG	117	default:
	118	goto getout;
	119	}
	120	if ((args.mask & res.mask) != args.mask) {
	121	status = -EIO;
	122	goto getout;
	123	}
	124
	125	if (res.acl_access != NULL) {
718360c5	126	if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) \|\|
013cdf10	127	res.acl_access->a_count == 0) {
b7fa0554 AG	128	posix_acl_release(res.acl_access);
	129	res.acl_access = NULL;
	130	}
	131	}
	132
013cdf10	133	if (res.mask & NFS_ACL)
b8a7a3a6	134	nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
013cdf10 CH	135	else
013cdf10 CH	136	forget_cached_acl(inode, ACL_TYPE_ACCESS);
b7fa0554	137
013cdf10	138	if (res.mask & NFS_DFACL)
b8a7a3a6	139	nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
013cdf10 CH	140	else
	141	forget_cached_acl(inode, ACL_TYPE_DEFAULT);
	142
	143	nfs_free_fattr(res.fattr);
	144	if (type == ACL_TYPE_ACCESS) {
	145	posix_acl_release(res.acl_default);
	146	return res.acl_access;
	147	} else {
	148	posix_acl_release(res.acl_access);
	149	return res.acl_default;
b7fa0554 AG	150	}
	151
	152	getout:
b8a7a3a6 AG	153	nfs3_abort_get_acl(&inode->i_acl);
b8a7a3a6 AG	154	nfs3_abort_get_acl(&inode->i_default_acl);
b7fa0554 AG	155	posix_acl_release(res.acl_access);
b7fa0554 AG	156	posix_acl_release(res.acl_default);
6e94d629	157	nfs_free_fattr(res.fattr);
013cdf10	158	return ERR_PTR(status);
b7fa0554 AG	159	}
b7fa0554 AG	160
8f493b9c	161	static int __nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
013cdf10	162	struct posix_acl *dfacl)
b7fa0554 AG	163	{
b7fa0554 AG	164	struct nfs_server *server = NFS_SERVER(inode);
6e94d629	165	struct nfs_fattr *fattr;
ae46141f	166	struct page *pages[NFSACL_MAXPAGES];
b7fa0554 AG	167	struct nfs3_setaclargs args = {
	168	.inode = inode,
	169	.mask = NFS_ACL,
	170	.acl_access = acl,
	171	.pages = pages,
	172	};
dead28da CL	173	struct rpc_message msg = {
	174	.rpc_argp = &args,
	175	.rpc_resp = &fattr,
	176	};
f87d928f TM	177	int status = 0;
	178
	179	if (acl == NULL && (!S_ISDIR(inode->i_mode) \|\| dfacl == NULL))
	180	goto out;
b7fa0554 AG	181
	182	status = -EOPNOTSUPP;
	183	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	184	goto out;
	185
f61f6da0 CL	186	/* We are doing this here because XDR marshalling does not
f61f6da0 CL	187	* return any results, it BUGs. */
b7fa0554 AG	188	status = -ENOSPC;
	189	if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
	190	goto out;
	191	if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
	192	goto out;
	193	if (S_ISDIR(inode->i_mode)) {
	194	args.mask \|= NFS_DFACL;
	195	args.acl_default = dfacl;
ae46141f TM	196	args.len = nfsacl_size(acl, dfacl);
	197	} else
	198	args.len = nfsacl_size(acl, NULL);
	199
	200	if (args.len > NFS_ACL_INLINE_BUFSIZE) {
	201	unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
	202
	203	status = -ENOMEM;
	204	do {
	205	args.pages[args.npages] = alloc_page(GFP_KERNEL);
	206	if (args.pages[args.npages] == NULL)
	207	goto out_freepages;
	208	args.npages++;
	209	} while (args.npages < npages);
b7fa0554 AG	210	}
	211
	212	dprintk("NFS call setacl\n");
6e94d629 TM	213	status = -ENOMEM;
	214	fattr = nfs_alloc_fattr();
	215	if (fattr == NULL)
	216	goto out_freepages;
	217
dead28da	218	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
6e94d629	219	msg.rpc_resp = fattr;
dead28da	220	status = rpc_call_sync(server->client_acl, &msg, 0);
f41f7418 TM	221	nfs_access_zap_cache(inode);
f41f7418 TM	222	nfs_zap_acl_cache(inode);
b7fa0554 AG	223	dprintk("NFS reply setacl: %d\n", status);
b7fa0554 AG	224
b7fa0554 AG	225	switch (status) {
b7fa0554 AG	226	case 0:
6e94d629	227	status = nfs_refresh_inode(inode, fattr);
b7fa0554 AG	228	break;
	229	case -EPFNOSUPPORT:
	230	case -EPROTONOSUPPORT:
	231	dprintk("NFS_V3_ACL SETACL RPC not supported"
	232	"(will not retry)\n");
	233	server->caps &= ~NFS_CAP_ACLS;
df561f66	234	fallthrough;
b7fa0554 AG	235	case -ENOTSUPP:
	236	status = -EOPNOTSUPP;
	237	}
6e94d629	238	nfs_free_fattr(fattr);
ae46141f TM	239	out_freepages:
	240	while (args.npages != 0) {
	241	args.npages--;
	242	__free_page(args.pages[args.npages]);
	243	}
b7fa0554 AG	244	out:
	245	return status;
	246	}
	247
8f493b9c TM	248	int nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
	249	struct posix_acl *dfacl)
	250	{
	251	int ret;
	252	ret = __nfs3_proc_setacls(inode, acl, dfacl);
	253	return (ret == -EOPNOTSUPP) ? 0 : ret;
	254
	255	}
	256
13e83a49	257	int nfs3_set_acl(struct mnt_idmap idmap, struct dentry dentry,
549c7297	258	struct posix_acl *acl, int type)
b7fa0554	259	{
7648f939	260	struct posix_acl orig = acl, dfacl = NULL, *alloc;
138060ba	261	struct inode *inode = d_inode(dentry);
b7fa0554 AG	262	int status;
	263
	264	if (S_ISDIR(inode->i_mode)) {
	265	switch(type) {
013cdf10	266	case ACL_TYPE_ACCESS:
cac2f8b8	267	alloc = get_inode_acl(inode, ACL_TYPE_DEFAULT);
013cdf10 CH	268	if (IS_ERR(alloc))
013cdf10 CH	269	goto fail;
7648f939	270	dfacl = alloc;
013cdf10 CH	271	break;
	272
	273	case ACL_TYPE_DEFAULT:
cac2f8b8	274	alloc = get_inode_acl(inode, ACL_TYPE_ACCESS);
013cdf10 CH	275	if (IS_ERR(alloc))
013cdf10 CH	276	goto fail;
7648f939 AG	277	dfacl = acl;
7648f939 AG	278	acl = alloc;
013cdf10	279	break;
b7fa0554	280	}
013cdf10	281	}
b7fa0554 AG	282
b7fa0554 AG	283	if (acl == NULL) {
7648f939	284	alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
b7fa0554 AG	285	if (IS_ERR(alloc))
b7fa0554 AG	286	goto fail;
7648f939	287	acl = alloc;
b7fa0554	288	}
8f493b9c	289	status = __nfs3_proc_setacls(inode, acl, dfacl);
7648f939 AG	290	out:
	291	if (acl != orig)
	292	posix_acl_release(acl);
	293	if (dfacl != orig)
	294	posix_acl_release(dfacl);
b7fa0554 AG	295	return status;
	296
	297	fail:
7648f939 AG	298	status = PTR_ERR(alloc);
7648f939 AG	299	goto out;
b7fa0554	300	}
055ffbea	301
74adf83f CH	302	static int
	303	nfs3_list_one_acl(struct inode inode, int type, const char name, void *data,
	304	size_t size, ssize_t *result)
	305	{
	306	struct posix_acl *acl;
	307	char p = data + result;
	308
cac2f8b8	309	acl = get_inode_acl(inode, type);
7a9e75a1	310	if (IS_ERR_OR_NULL(acl))
74adf83f CH	311	return 0;
	312
	313	posix_acl_release(acl);
	314
	315	*result += strlen(name);
	316	*result += 1;
	317	if (!size)
	318	return 0;
	319	if (*result > size)
	320	return -ERANGE;
	321
	322	strcpy(p, name);
	323	return 0;
	324	}
	325
	326	ssize_t
	327	nfs3_listxattr(struct dentry dentry, char data, size_t size)
	328	{
2b0143b5	329	struct inode *inode = d_inode(dentry);
74adf83f CH	330	ssize_t result = 0;
	331	int error;
	332
	333	error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
97d79299	334	XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
74adf83f CH	335	if (error)
	336	return error;
	337
	338	error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
97d79299	339	XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
74adf83f CH	340	if (error)
	341	return error;
	342	return result;
	343	}