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

#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"

#define NFSDBG_FACILITY	NFSDBG_PROC

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);

	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;
		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)
		set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
	else
		forget_cached_acl(inode, ACL_TYPE_ACCESS);

	if (res.mask & NFS_DFACL)
		set_cached_acl(inode, ACL_TYPE_DEFAULT, 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:
	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);
			set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
			set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
			break;
		case -EPFNOSUPPORT:
		case -EPROTONOSUPPORT:
			dprintk("NFS_V3_ACL SETACL RPC not supported"
					"(will not retry)\n");
			server->caps &= ~NFS_CAP_ACLS;
		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 *alloc = NULL, *dfacl = NULL;
	int status;

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

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

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

fail:
	return PTR_ERR(alloc);
}

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 = dentry->d_inode;
	ssize_t result = 0;
	int error;

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

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