[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

ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
	struct inode *inode = dentry->d_inode;
	struct posix_acl *acl;
	int pos=0, len=0;

#	define output(s) do {						\
			if (pos + sizeof(s) <= size) {			\
				memcpy(buffer + pos, s, sizeof(s));	\
				pos += sizeof(s);			\
			}						\
			len += sizeof(s);				\
		} while(0)

	acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl) {
		output("system.posix_acl_access");
		posix_acl_release(acl);
	}

	if (S_ISDIR(inode->i_mode)) {
		acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
		if (IS_ERR(acl))
			return PTR_ERR(acl);
		if (acl) {
			output("system.posix_acl_default");
			posix_acl_release(acl);
		}
	}

#	undef output

	if (!buffer || len <= size)
		return len;
	return -ERANGE;
}

ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
		void *buffer, size_t size)
{
	struct inode *inode = dentry->d_inode;
	struct posix_acl *acl;
	int type, error = 0;

	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
		type = ACL_TYPE_ACCESS;
	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
		type = ACL_TYPE_DEFAULT;
	else
		return -EOPNOTSUPP;

	acl = nfs3_proc_getacl(inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	else if (acl) {
		if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
			error = -ENODATA;
		else
			error = posix_acl_to_xattr(acl, buffer, size);
		posix_acl_release(acl);
	} else
		error = -ENODATA;

	return error;
}

int nfs3_setxattr(struct dentry *dentry, const char *name,
	     const void *value, size_t size, int flags)
{
	struct inode *inode = dentry->d_inode;
	struct posix_acl *acl;
	int type, error;

	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
		type = ACL_TYPE_ACCESS;
	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
		type = ACL_TYPE_DEFAULT;
	else
		return -EOPNOTSUPP;

	acl = posix_acl_from_xattr(value, size);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	error = nfs3_proc_setacl(inode, type, acl);
	posix_acl_release(acl);

	return error;
}

int nfs3_removexattr(struct dentry *dentry, const char *name)
{
	struct inode *inode = dentry->d_inode;
	int type;

	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
		type = ACL_TYPE_ACCESS;
	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
		type = ACL_TYPE_DEFAULT;
	else
		return -EOPNOTSUPP;

	return nfs3_proc_setacl(inode, type, NULL);
}

static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
{
	if (!IS_ERR(nfsi->acl_access)) {
		posix_acl_release(nfsi->acl_access);
		nfsi->acl_access = ERR_PTR(-EAGAIN);
	}
	if (!IS_ERR(nfsi->acl_default)) {
		posix_acl_release(nfsi->acl_default);
		nfsi->acl_default = ERR_PTR(-EAGAIN);
	}
}

void nfs3_forget_cached_acls(struct inode *inode)
{
	dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
		inode->i_ino);
	spin_lock(&inode->i_lock);
	__nfs3_forget_cached_acls(NFS_I(inode));
	spin_unlock(&inode->i_lock);
}

static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct posix_acl *acl = ERR_PTR(-EINVAL);

	spin_lock(&inode->i_lock);
	switch(type) {
		case ACL_TYPE_ACCESS:
			acl = nfsi->acl_access;
			break;

		case ACL_TYPE_DEFAULT:
			acl = nfsi->acl_default;
			break;

		default:
			goto out;
	}
	if (IS_ERR(acl))
		acl = ERR_PTR(-EAGAIN);
	else
		acl = posix_acl_dup(acl);
out:
	spin_unlock(&inode->i_lock);
	dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
		inode->i_ino, type, acl);
	return acl;
}

static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl,
		    struct posix_acl *dfacl)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
		inode->i_ino, acl, dfacl);
	spin_lock(&inode->i_lock);
	__nfs3_forget_cached_acls(NFS_I(inode));
	if (!IS_ERR(acl))
		nfsi->acl_access = posix_acl_dup(acl);
	if (!IS_ERR(dfacl))
		nfsi->acl_default = posix_acl_dup(dfacl);
	spin_unlock(&inode->i_lock);
}

struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs_fattr fattr;
	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 = {
		.fattr =	&fattr,
	};
	struct rpc_message msg = {
		.rpc_argp	= &args,
		.rpc_resp	= &res,
	};
	struct posix_acl *acl;
	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);
	acl = nfs3_get_cached_acl(inode, type);
	if (acl != ERR_PTR(-EAGAIN))
		return acl;
	acl = NULL;

	/*
	 * 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];
	nfs_fattr_init(&fattr);
	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, &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) {
			posix_acl_release(res.acl_access);
			res.acl_access = NULL;
		}
	}
	nfs3_cache_acls(inode,
		(res.mask & NFS_ACL)   ? res.acl_access  : ERR_PTR(-EINVAL),
		(res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));

	switch(type) {
		case ACL_TYPE_ACCESS:
			acl = res.acl_access;
			res.acl_access = NULL;
			break;

		case ACL_TYPE_DEFAULT:
			acl = res.acl_default;
			res.acl_default = NULL;
	}

getout:
	posix_acl_release(res.acl_access);
	posix_acl_release(res.acl_default);

	if (status != 0) {
		posix_acl_release(acl);
		acl = ERR_PTR(status);
	}
	return acl;
}

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;

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

	/* We are doing this here, because XDR marshalling can only
	   return -ENOMEM. */
	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");
	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
	nfs_fattr_init(&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);
			nfs3_cache_acls(inode, acl, 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;
	}
out_freepages:
	while (args.npages != 0) {
		args.npages--;
		__free_page(args.pages[args.npages]);
	}
out:
	return status;
}

int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
{
	struct posix_acl *alloc = NULL, *dfacl = NULL;
	int status;

	if (S_ISDIR(inode->i_mode)) {
		switch(type) {
			case ACL_TYPE_ACCESS:
				alloc = dfacl = nfs3_proc_getacl(inode,
						ACL_TYPE_DEFAULT);
				if (IS_ERR(alloc))
					goto fail;
				break;

			case ACL_TYPE_DEFAULT:
				dfacl = acl;
				alloc = acl = nfs3_proc_getacl(inode,
						ACL_TYPE_ACCESS);
				if (IS_ERR(alloc))
					goto fail;
				break;

			default:
				return -EINVAL;
		}
	} else if (type != ACL_TYPE_ACCESS)
			return -EINVAL;

	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);
}

int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
		mode_t mode)
{
	struct posix_acl *dfacl, *acl;
	int error = 0;

	dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
	if (IS_ERR(dfacl)) {
		error = PTR_ERR(dfacl);
		return (error == -EOPNOTSUPP) ? 0 : error;
	}
	if (!dfacl)
		return 0;
	acl = posix_acl_clone(dfacl, GFP_KERNEL);
	error = -ENOMEM;
	if (!acl)
		goto out_release_dfacl;
	error = posix_acl_create_masq(acl, &mode);
	if (error < 0)
		goto out_release_acl;
	error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
						      dfacl : NULL);
out_release_acl:
	posix_acl_release(acl);
out_release_dfacl:
	posix_acl_release(dfacl);
	return error;
}
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
	12
	13	ssize_t nfs3_listxattr(struct dentry dentry, char buffer, size_t size)
	14	{
	15	struct inode *inode = dentry->d_inode;
	16	struct posix_acl *acl;
	17	int pos=0, len=0;
	18
	19	# define output(s) do { \
	20	if (pos + sizeof(s) <= size) { \
	21	memcpy(buffer + pos, s, sizeof(s)); \
	22	pos += sizeof(s); \
	23	} \
	24	len += sizeof(s); \
	25	} while(0)
	26
	27	acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
	28	if (IS_ERR(acl))
	29	return PTR_ERR(acl);
	30	if (acl) {
	31	output("system.posix_acl_access");
	32	posix_acl_release(acl);
	33	}
	34
	35	if (S_ISDIR(inode->i_mode)) {
	36	acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
	37	if (IS_ERR(acl))
	38	return PTR_ERR(acl);
	39	if (acl) {
	40	output("system.posix_acl_default");
	41	posix_acl_release(acl);
	42	}
	43	}
	44
	45	# undef output
	46
	47	if (!buffer \|\| len <= size)
	48	return len;
	49	return -ERANGE;
	50	}
	51
	52	ssize_t nfs3_getxattr(struct dentry dentry, const char name,
	53	void *buffer, size_t size)
	54	{
	55	struct inode *inode = dentry->d_inode;
	56	struct posix_acl *acl;
	57	int type, error = 0;
	58
334a13ec	59	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
b7fa0554	60	type = ACL_TYPE_ACCESS;
334a13ec	61	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
b7fa0554 AG	62	type = ACL_TYPE_DEFAULT;
	63	else
	64	return -EOPNOTSUPP;
	65
	66	acl = nfs3_proc_getacl(inode, type);
	67	if (IS_ERR(acl))
	68	return PTR_ERR(acl);
	69	else if (acl) {
	70	if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
	71	error = -ENODATA;
	72	else
	73	error = posix_acl_to_xattr(acl, buffer, size);
	74	posix_acl_release(acl);
	75	} else
	76	error = -ENODATA;
	77
	78	return error;
	79	}
	80
	81	int nfs3_setxattr(struct dentry dentry, const char name,
	82	const void *value, size_t size, int flags)
	83	{
	84	struct inode *inode = dentry->d_inode;
	85	struct posix_acl *acl;
	86	int type, error;
	87
334a13ec	88	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
b7fa0554	89	type = ACL_TYPE_ACCESS;
334a13ec	90	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
b7fa0554 AG	91	type = ACL_TYPE_DEFAULT;
	92	else
	93	return -EOPNOTSUPP;
	94
	95	acl = posix_acl_from_xattr(value, size);
	96	if (IS_ERR(acl))
	97	return PTR_ERR(acl);
	98	error = nfs3_proc_setacl(inode, type, acl);
	99	posix_acl_release(acl);
	100
	101	return error;
	102	}
	103
	104	int nfs3_removexattr(struct dentry dentry, const char name)
	105	{
	106	struct inode *inode = dentry->d_inode;
	107	int type;
	108
334a13ec	109	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
b7fa0554	110	type = ACL_TYPE_ACCESS;
334a13ec	111	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
b7fa0554 AG	112	type = ACL_TYPE_DEFAULT;
	113	else
	114	return -EOPNOTSUPP;
	115
	116	return nfs3_proc_setacl(inode, type, NULL);
	117	}
	118
5c6a9f7d AG	119	static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
5c6a9f7d AG	120	{
458818ed	121	if (!IS_ERR(nfsi->acl_access)) {
5c6a9f7d AG	122	posix_acl_release(nfsi->acl_access);
	123	nfsi->acl_access = ERR_PTR(-EAGAIN);
	124	}
458818ed	125	if (!IS_ERR(nfsi->acl_default)) {
5c6a9f7d AG	126	posix_acl_release(nfsi->acl_default);
	127	nfsi->acl_default = ERR_PTR(-EAGAIN);
	128	}
	129	}
	130
	131	void nfs3_forget_cached_acls(struct inode *inode)
	132	{
	133	dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
	134	inode->i_ino);
	135	spin_lock(&inode->i_lock);
	136	__nfs3_forget_cached_acls(NFS_I(inode));
	137	spin_unlock(&inode->i_lock);
	138	}
	139
	140	static struct posix_acl nfs3_get_cached_acl(struct inode inode, int type)
	141	{
	142	struct nfs_inode *nfsi = NFS_I(inode);
458818ed	143	struct posix_acl *acl = ERR_PTR(-EINVAL);
5c6a9f7d AG	144
	145	spin_lock(&inode->i_lock);
	146	switch(type) {
	147	case ACL_TYPE_ACCESS:
	148	acl = nfsi->acl_access;
	149	break;
	150
	151	case ACL_TYPE_DEFAULT:
	152	acl = nfsi->acl_default;
	153	break;
	154
	155	default:
458818ed	156	goto out;
5c6a9f7d	157	}
458818ed	158	if (IS_ERR(acl))
5c6a9f7d AG	159	acl = ERR_PTR(-EAGAIN);
	160	else
	161	acl = posix_acl_dup(acl);
458818ed	162	out:
5c6a9f7d AG	163	spin_unlock(&inode->i_lock);
	164	dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
	165	inode->i_ino, type, acl);
	166	return acl;
	167	}
	168
	169	static void nfs3_cache_acls(struct inode inode, struct posix_acl acl,
	170	struct posix_acl *dfacl)
	171	{
	172	struct nfs_inode *nfsi = NFS_I(inode);
	173
	174	dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
	175	inode->i_ino, acl, dfacl);
	176	spin_lock(&inode->i_lock);
	177	__nfs3_forget_cached_acls(NFS_I(inode));
4814f56d AG	178	if (!IS_ERR(acl))
	179	nfsi->acl_access = posix_acl_dup(acl);
	180	if (!IS_ERR(dfacl))
	181	nfsi->acl_default = posix_acl_dup(dfacl);
5c6a9f7d AG	182	spin_unlock(&inode->i_lock);
	183	}
	184
b7fa0554 AG	185	struct posix_acl nfs3_proc_getacl(struct inode inode, int type)
	186	{
	187	struct nfs_server *server = NFS_SERVER(inode);
	188	struct nfs_fattr fattr;
	189	struct page *pages[NFSACL_MAXPAGES] = { };
	190	struct nfs3_getaclargs args = {
	191	.fh = NFS_FH(inode),
	192	/* The xdr layer may allocate pages here. */
	193	.pages = pages,
	194	};
	195	struct nfs3_getaclres res = {
	196	.fattr = &fattr,
	197	};
dead28da CL	198	struct rpc_message msg = {
	199	.rpc_argp = &args,
	200	.rpc_resp = &res,
	201	};
5c6a9f7d	202	struct posix_acl *acl;
b7fa0554 AG	203	int status, count;
	204
	205	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	206	return ERR_PTR(-EOPNOTSUPP);
	207
5c6a9f7d AG	208	status = nfs_revalidate_inode(server, inode);
	209	if (status < 0)
	210	return ERR_PTR(status);
	211	acl = nfs3_get_cached_acl(inode, type);
	212	if (acl != ERR_PTR(-EAGAIN))
	213	return acl;
	214	acl = NULL;
b7fa0554	215
5c6a9f7d AG	216	/*
	217	* Only get the access acl when explicitly requested: We don't
	218	* need it for access decisions, and only some applications use
	219	* it. Applications which request the access acl first are not
	220	* penalized from this optimization.
	221	*/
	222	if (type == ACL_TYPE_ACCESS)
	223	args.mask \|= NFS_ACLCNT\|NFS_ACL;
	224	if (S_ISDIR(inode->i_mode))
	225	args.mask \|= NFS_DFACLCNT\|NFS_DFACL;
	226	if (args.mask == 0)
	227	return NULL;
b7fa0554 AG	228
b7fa0554 AG	229	dprintk("NFS call getacl\n");
dead28da	230	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
f25b874d	231	nfs_fattr_init(&fattr);
dead28da	232	status = rpc_call_sync(server->client_acl, &msg, 0);
b7fa0554 AG	233	dprintk("NFS reply getacl: %d\n", status);
	234
	235	/* pages may have been allocated at the xdr layer. */
	236	for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
	237	__free_page(args.pages[count]);
	238
	239	switch (status) {
	240	case 0:
	241	status = nfs_refresh_inode(inode, &fattr);
	242	break;
	243	case -EPFNOSUPPORT:
	244	case -EPROTONOSUPPORT:
	245	dprintk("NFS_V3_ACL extension not supported; disabling\n");
	246	server->caps &= ~NFS_CAP_ACLS;
	247	case -ENOTSUPP:
	248	status = -EOPNOTSUPP;
	249	default:
	250	goto getout;
	251	}
	252	if ((args.mask & res.mask) != args.mask) {
	253	status = -EIO;
	254	goto getout;
	255	}
	256
	257	if (res.acl_access != NULL) {
	258	if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
	259	posix_acl_release(res.acl_access);
	260	res.acl_access = NULL;
	261	}
	262	}
4814f56d AG	263	nfs3_cache_acls(inode,
	264	(res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL),
	265	(res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));
b7fa0554 AG	266
	267	switch(type) {
	268	case ACL_TYPE_ACCESS:
	269	acl = res.acl_access;
	270	res.acl_access = NULL;
	271	break;
	272
	273	case ACL_TYPE_DEFAULT:
	274	acl = res.acl_default;
	275	res.acl_default = NULL;
	276	}
	277
	278	getout:
	279	posix_acl_release(res.acl_access);
	280	posix_acl_release(res.acl_default);
	281
	282	if (status != 0) {
	283	posix_acl_release(acl);
	284	acl = ERR_PTR(status);
	285	}
	286	return acl;
	287	}
	288
	289	static int nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
	290	struct posix_acl *dfacl)
	291	{
	292	struct nfs_server *server = NFS_SERVER(inode);
	293	struct nfs_fattr fattr;
ae46141f	294	struct page *pages[NFSACL_MAXPAGES];
b7fa0554 AG	295	struct nfs3_setaclargs args = {
	296	.inode = inode,
	297	.mask = NFS_ACL,
	298	.acl_access = acl,
	299	.pages = pages,
	300	};
dead28da CL	301	struct rpc_message msg = {
	302	.rpc_argp = &args,
	303	.rpc_resp = &fattr,
	304	};
ae46141f	305	int status;
b7fa0554 AG	306
	307	status = -EOPNOTSUPP;
	308	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	309	goto out;
	310
	311	/* We are doing this here, because XDR marshalling can only
	312	return -ENOMEM. */
	313	status = -ENOSPC;
	314	if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
	315	goto out;
	316	if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
	317	goto out;
	318	if (S_ISDIR(inode->i_mode)) {
	319	args.mask \|= NFS_DFACL;
	320	args.acl_default = dfacl;
ae46141f TM	321	args.len = nfsacl_size(acl, dfacl);
	322	} else
	323	args.len = nfsacl_size(acl, NULL);
	324
	325	if (args.len > NFS_ACL_INLINE_BUFSIZE) {
	326	unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
	327
	328	status = -ENOMEM;
	329	do {
	330	args.pages[args.npages] = alloc_page(GFP_KERNEL);
	331	if (args.pages[args.npages] == NULL)
	332	goto out_freepages;
	333	args.npages++;
	334	} while (args.npages < npages);
b7fa0554 AG	335	}
	336
	337	dprintk("NFS call setacl\n");
dead28da	338	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
f25b874d	339	nfs_fattr_init(&fattr);
dead28da	340	status = rpc_call_sync(server->client_acl, &msg, 0);
f41f7418 TM	341	nfs_access_zap_cache(inode);
f41f7418 TM	342	nfs_zap_acl_cache(inode);
b7fa0554 AG	343	dprintk("NFS reply setacl: %d\n", status);
b7fa0554 AG	344
b7fa0554 AG	345	switch (status) {
	346	case 0:
	347	status = nfs_refresh_inode(inode, &fattr);
4814f56d	348	nfs3_cache_acls(inode, acl, dfacl);
b7fa0554 AG	349	break;
	350	case -EPFNOSUPPORT:
	351	case -EPROTONOSUPPORT:
	352	dprintk("NFS_V3_ACL SETACL RPC not supported"
	353	"(will not retry)\n");
	354	server->caps &= ~NFS_CAP_ACLS;
	355	case -ENOTSUPP:
	356	status = -EOPNOTSUPP;
	357	}
ae46141f TM	358	out_freepages:
	359	while (args.npages != 0) {
	360	args.npages--;
	361	__free_page(args.pages[args.npages]);
	362	}
b7fa0554 AG	363	out:
	364	return status;
	365	}
	366
	367	int nfs3_proc_setacl(struct inode inode, int type, struct posix_acl acl)
	368	{
	369	struct posix_acl alloc = NULL, dfacl = NULL;
	370	int status;
	371
	372	if (S_ISDIR(inode->i_mode)) {
	373	switch(type) {
	374	case ACL_TYPE_ACCESS:
	375	alloc = dfacl = nfs3_proc_getacl(inode,
	376	ACL_TYPE_DEFAULT);
	377	if (IS_ERR(alloc))
	378	goto fail;
	379	break;
	380
	381	case ACL_TYPE_DEFAULT:
	382	dfacl = acl;
	383	alloc = acl = nfs3_proc_getacl(inode,
	384	ACL_TYPE_ACCESS);
	385	if (IS_ERR(alloc))
	386	goto fail;
	387	break;
	388
	389	default:
	390	return -EINVAL;
	391	}
	392	} else if (type != ACL_TYPE_ACCESS)
	393	return -EINVAL;
	394
	395	if (acl == NULL) {
	396	alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
	397	if (IS_ERR(alloc))
	398	goto fail;
	399	}
	400	status = nfs3_proc_setacls(inode, acl, dfacl);
	401	posix_acl_release(alloc);
	402	return status;
	403
	404	fail:
	405	return PTR_ERR(alloc);
	406	}
055ffbea AG	407
	408	int nfs3_proc_set_default_acl(struct inode dir, struct inode inode,
	409	mode_t mode)
	410	{
	411	struct posix_acl dfacl, acl;
	412	int error = 0;
	413
	414	dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
	415	if (IS_ERR(dfacl)) {
	416	error = PTR_ERR(dfacl);
	417	return (error == -EOPNOTSUPP) ? 0 : error;
	418	}
	419	if (!dfacl)
	420	return 0;
	421	acl = posix_acl_clone(dfacl, GFP_KERNEL);
	422	error = -ENOMEM;
	423	if (!acl)
	424	goto out_release_dfacl;
	425	error = posix_acl_create_masq(acl, &mode);
	426	if (error < 0)
	427	goto out_release_acl;
	428	error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
	429	dfacl : NULL);
	430	out_release_acl:
	431	posix_acl_release(acl);
	432	out_release_dfacl:
	433	posix_acl_release(dfacl);
	434	return error;
	435	}