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