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

#include <linux/fs.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 AG	1	#include <linux/fs.h>
	2	#include <linux/nfs.h>
	3	#include <linux/nfs3.h>
	4	#include <linux/nfs_fs.h>
334a13ec	5	#include <linux/posix_acl_xattr.h>
b7fa0554 AG	6	#include <linux/nfsacl.h>
b7fa0554 AG	7
f41f7418 TM	8	#include "internal.h"
f41f7418 TM	9
b7fa0554 AG	10	#define NFSDBG_FACILITY NFSDBG_PROC
	11
	12	ssize_t nfs3_listxattr(struct dentry dentry, char buffer, size_t size)
	13	{
	14	struct inode *inode = dentry->d_inode;
	15	struct posix_acl *acl;
	16	int pos=0, len=0;
	17
	18	# define output(s) do { \
	19	if (pos + sizeof(s) <= size) { \
	20	memcpy(buffer + pos, s, sizeof(s)); \
	21	pos += sizeof(s); \
	22	} \
	23	len += sizeof(s); \
	24	} while(0)
	25
	26	acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
	27	if (IS_ERR(acl))
	28	return PTR_ERR(acl);
	29	if (acl) {
	30	output("system.posix_acl_access");
	31	posix_acl_release(acl);
	32	}
	33
	34	if (S_ISDIR(inode->i_mode)) {
	35	acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
	36	if (IS_ERR(acl))
	37	return PTR_ERR(acl);
	38	if (acl) {
	39	output("system.posix_acl_default");
	40	posix_acl_release(acl);
	41	}
	42	}
	43
	44	# undef output
	45
	46	if (!buffer \|\| len <= size)
	47	return len;
	48	return -ERANGE;
	49	}
	50
	51	ssize_t nfs3_getxattr(struct dentry dentry, const char name,
	52	void *buffer, size_t size)
	53	{
	54	struct inode *inode = dentry->d_inode;
	55	struct posix_acl *acl;
	56	int type, error = 0;
	57
334a13ec	58	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
b7fa0554	59	type = ACL_TYPE_ACCESS;
334a13ec	60	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
b7fa0554 AG	61	type = ACL_TYPE_DEFAULT;
	62	else
	63	return -EOPNOTSUPP;
	64
	65	acl = nfs3_proc_getacl(inode, type);
	66	if (IS_ERR(acl))
	67	return PTR_ERR(acl);
	68	else if (acl) {
	69	if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
	70	error = -ENODATA;
	71	else
	72	error = posix_acl_to_xattr(acl, buffer, size);
	73	posix_acl_release(acl);
	74	} else
	75	error = -ENODATA;
	76
	77	return error;
	78	}
	79
	80	int nfs3_setxattr(struct dentry dentry, const char name,
	81	const void *value, size_t size, int flags)
	82	{
	83	struct inode *inode = dentry->d_inode;
	84	struct posix_acl *acl;
	85	int type, error;
	86
334a13ec	87	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
b7fa0554	88	type = ACL_TYPE_ACCESS;
334a13ec	89	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
b7fa0554 AG	90	type = ACL_TYPE_DEFAULT;
	91	else
	92	return -EOPNOTSUPP;
	93
	94	acl = posix_acl_from_xattr(value, size);
	95	if (IS_ERR(acl))
	96	return PTR_ERR(acl);
	97	error = nfs3_proc_setacl(inode, type, acl);
	98	posix_acl_release(acl);
	99
	100	return error;
	101	}
	102
	103	int nfs3_removexattr(struct dentry dentry, const char name)
	104	{
	105	struct inode *inode = dentry->d_inode;
	106	int type;
	107
334a13ec	108	if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
b7fa0554	109	type = ACL_TYPE_ACCESS;
334a13ec	110	else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
b7fa0554 AG	111	type = ACL_TYPE_DEFAULT;
	112	else
	113	return -EOPNOTSUPP;
	114
	115	return nfs3_proc_setacl(inode, type, NULL);
	116	}
	117
5c6a9f7d AG	118	static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
5c6a9f7d AG	119	{
458818ed	120	if (!IS_ERR(nfsi->acl_access)) {
5c6a9f7d AG	121	posix_acl_release(nfsi->acl_access);
	122	nfsi->acl_access = ERR_PTR(-EAGAIN);
	123	}
458818ed	124	if (!IS_ERR(nfsi->acl_default)) {
5c6a9f7d AG	125	posix_acl_release(nfsi->acl_default);
	126	nfsi->acl_default = ERR_PTR(-EAGAIN);
	127	}
	128	}
	129
	130	void nfs3_forget_cached_acls(struct inode *inode)
	131	{
	132	dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
	133	inode->i_ino);
	134	spin_lock(&inode->i_lock);
	135	__nfs3_forget_cached_acls(NFS_I(inode));
	136	spin_unlock(&inode->i_lock);
	137	}
	138
	139	static struct posix_acl nfs3_get_cached_acl(struct inode inode, int type)
	140	{
	141	struct nfs_inode *nfsi = NFS_I(inode);
458818ed	142	struct posix_acl *acl = ERR_PTR(-EINVAL);
5c6a9f7d AG	143
	144	spin_lock(&inode->i_lock);
	145	switch(type) {
	146	case ACL_TYPE_ACCESS:
	147	acl = nfsi->acl_access;
	148	break;
	149
	150	case ACL_TYPE_DEFAULT:
	151	acl = nfsi->acl_default;
	152	break;
	153
	154	default:
458818ed	155	goto out;
5c6a9f7d	156	}
458818ed	157	if (IS_ERR(acl))
5c6a9f7d AG	158	acl = ERR_PTR(-EAGAIN);
	159	else
	160	acl = posix_acl_dup(acl);
458818ed	161	out:
5c6a9f7d AG	162	spin_unlock(&inode->i_lock);
	163	dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
	164	inode->i_ino, type, acl);
	165	return acl;
	166	}
	167
	168	static void nfs3_cache_acls(struct inode inode, struct posix_acl acl,
	169	struct posix_acl *dfacl)
	170	{
	171	struct nfs_inode *nfsi = NFS_I(inode);
	172
	173	dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
	174	inode->i_ino, acl, dfacl);
	175	spin_lock(&inode->i_lock);
	176	__nfs3_forget_cached_acls(NFS_I(inode));
4814f56d AG	177	if (!IS_ERR(acl))
	178	nfsi->acl_access = posix_acl_dup(acl);
	179	if (!IS_ERR(dfacl))
	180	nfsi->acl_default = posix_acl_dup(dfacl);
5c6a9f7d AG	181	spin_unlock(&inode->i_lock);
	182	}
	183
b7fa0554 AG	184	struct posix_acl nfs3_proc_getacl(struct inode inode, int type)
	185	{
	186	struct nfs_server *server = NFS_SERVER(inode);
	187	struct nfs_fattr fattr;
	188	struct page *pages[NFSACL_MAXPAGES] = { };
	189	struct nfs3_getaclargs args = {
	190	.fh = NFS_FH(inode),
	191	/* The xdr layer may allocate pages here. */
	192	.pages = pages,
	193	};
	194	struct nfs3_getaclres res = {
	195	.fattr = &fattr,
	196	};
dead28da CL	197	struct rpc_message msg = {
	198	.rpc_argp = &args,
	199	.rpc_resp = &res,
	200	};
5c6a9f7d	201	struct posix_acl *acl;
b7fa0554 AG	202	int status, count;
	203
	204	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	205	return ERR_PTR(-EOPNOTSUPP);
	206
5c6a9f7d AG	207	status = nfs_revalidate_inode(server, inode);
	208	if (status < 0)
	209	return ERR_PTR(status);
	210	acl = nfs3_get_cached_acl(inode, type);
	211	if (acl != ERR_PTR(-EAGAIN))
	212	return acl;
	213	acl = NULL;
b7fa0554	214
5c6a9f7d AG	215	/*
	216	* Only get the access acl when explicitly requested: We don't
	217	* need it for access decisions, and only some applications use
	218	* it. Applications which request the access acl first are not
	219	* penalized from this optimization.
	220	*/
	221	if (type == ACL_TYPE_ACCESS)
	222	args.mask \|= NFS_ACLCNT\|NFS_ACL;
	223	if (S_ISDIR(inode->i_mode))
	224	args.mask \|= NFS_DFACLCNT\|NFS_DFACL;
	225	if (args.mask == 0)
	226	return NULL;
b7fa0554 AG	227
b7fa0554 AG	228	dprintk("NFS call getacl\n");
dead28da	229	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
f25b874d	230	nfs_fattr_init(&fattr);
dead28da	231	status = rpc_call_sync(server->client_acl, &msg, 0);
b7fa0554 AG	232	dprintk("NFS reply getacl: %d\n", status);
	233
	234	/* pages may have been allocated at the xdr layer. */
	235	for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
	236	__free_page(args.pages[count]);
	237
	238	switch (status) {
	239	case 0:
	240	status = nfs_refresh_inode(inode, &fattr);
	241	break;
	242	case -EPFNOSUPPORT:
	243	case -EPROTONOSUPPORT:
	244	dprintk("NFS_V3_ACL extension not supported; disabling\n");
	245	server->caps &= ~NFS_CAP_ACLS;
	246	case -ENOTSUPP:
	247	status = -EOPNOTSUPP;
	248	default:
	249	goto getout;
	250	}
	251	if ((args.mask & res.mask) != args.mask) {
	252	status = -EIO;
	253	goto getout;
	254	}
	255
	256	if (res.acl_access != NULL) {
	257	if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
	258	posix_acl_release(res.acl_access);
	259	res.acl_access = NULL;
	260	}
	261	}
4814f56d AG	262	nfs3_cache_acls(inode,
	263	(res.mask & NFS_ACL) ? res.acl_access : ERR_PTR(-EINVAL),
	264	(res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));
b7fa0554 AG	265
	266	switch(type) {
	267	case ACL_TYPE_ACCESS:
	268	acl = res.acl_access;
	269	res.acl_access = NULL;
	270	break;
	271
	272	case ACL_TYPE_DEFAULT:
	273	acl = res.acl_default;
	274	res.acl_default = NULL;
	275	}
	276
	277	getout:
	278	posix_acl_release(res.acl_access);
	279	posix_acl_release(res.acl_default);
	280
	281	if (status != 0) {
	282	posix_acl_release(acl);
	283	acl = ERR_PTR(status);
	284	}
	285	return acl;
	286	}
	287
	288	static int nfs3_proc_setacls(struct inode inode, struct posix_acl acl,
	289	struct posix_acl *dfacl)
	290	{
	291	struct nfs_server *server = NFS_SERVER(inode);
	292	struct nfs_fattr fattr;
ae46141f	293	struct page *pages[NFSACL_MAXPAGES];
b7fa0554 AG	294	struct nfs3_setaclargs args = {
	295	.inode = inode,
	296	.mask = NFS_ACL,
	297	.acl_access = acl,
	298	.pages = pages,
	299	};
dead28da CL	300	struct rpc_message msg = {
	301	.rpc_argp = &args,
	302	.rpc_resp = &fattr,
	303	};
ae46141f	304	int status;
b7fa0554 AG	305
	306	status = -EOPNOTSUPP;
	307	if (!nfs_server_capable(inode, NFS_CAP_ACLS))
	308	goto out;
	309
	310	/* We are doing this here, because XDR marshalling can only
	311	return -ENOMEM. */
	312	status = -ENOSPC;
	313	if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
	314	goto out;
	315	if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
	316	goto out;
	317	if (S_ISDIR(inode->i_mode)) {
	318	args.mask \|= NFS_DFACL;
	319	args.acl_default = dfacl;
ae46141f TM	320	args.len = nfsacl_size(acl, dfacl);
	321	} else
	322	args.len = nfsacl_size(acl, NULL);
	323
	324	if (args.len > NFS_ACL_INLINE_BUFSIZE) {
	325	unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
	326
	327	status = -ENOMEM;
	328	do {
	329	args.pages[args.npages] = alloc_page(GFP_KERNEL);
	330	if (args.pages[args.npages] == NULL)
	331	goto out_freepages;
	332	args.npages++;
	333	} while (args.npages < npages);
b7fa0554 AG	334	}
	335
	336	dprintk("NFS call setacl\n");
dead28da	337	msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
f25b874d	338	nfs_fattr_init(&fattr);
dead28da	339	status = rpc_call_sync(server->client_acl, &msg, 0);
f41f7418 TM	340	nfs_access_zap_cache(inode);
f41f7418 TM	341	nfs_zap_acl_cache(inode);
b7fa0554 AG	342	dprintk("NFS reply setacl: %d\n", status);
b7fa0554 AG	343
b7fa0554 AG	344	switch (status) {
	345	case 0:
	346	status = nfs_refresh_inode(inode, &fattr);
4814f56d	347	nfs3_cache_acls(inode, acl, dfacl);
b7fa0554 AG	348	break;
	349	case -EPFNOSUPPORT:
	350	case -EPROTONOSUPPORT:
	351	dprintk("NFS_V3_ACL SETACL RPC not supported"
	352	"(will not retry)\n");
	353	server->caps &= ~NFS_CAP_ACLS;
	354	case -ENOTSUPP:
	355	status = -EOPNOTSUPP;
	356	}
ae46141f TM	357	out_freepages:
	358	while (args.npages != 0) {
	359	args.npages--;
	360	__free_page(args.pages[args.npages]);
	361	}
b7fa0554 AG	362	out:
	363	return status;
	364	}
	365
	366	int nfs3_proc_setacl(struct inode inode, int type, struct posix_acl acl)
	367	{
	368	struct posix_acl alloc = NULL, dfacl = NULL;
	369	int status;
	370
	371	if (S_ISDIR(inode->i_mode)) {
	372	switch(type) {
	373	case ACL_TYPE_ACCESS:
	374	alloc = dfacl = nfs3_proc_getacl(inode,
	375	ACL_TYPE_DEFAULT);
	376	if (IS_ERR(alloc))
	377	goto fail;
	378	break;
	379
	380	case ACL_TYPE_DEFAULT:
	381	dfacl = acl;
	382	alloc = acl = nfs3_proc_getacl(inode,
	383	ACL_TYPE_ACCESS);
	384	if (IS_ERR(alloc))
	385	goto fail;
	386	break;
	387
	388	default:
	389	return -EINVAL;
	390	}
	391	} else if (type != ACL_TYPE_ACCESS)
	392	return -EINVAL;
	393
	394	if (acl == NULL) {
	395	alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
	396	if (IS_ERR(alloc))
	397	goto fail;
	398	}
	399	status = nfs3_proc_setacls(inode, acl, dfacl);
	400	posix_acl_release(alloc);
	401	return status;
	402
	403	fail:
	404	return PTR_ERR(alloc);
	405	}
055ffbea AG	406
	407	int nfs3_proc_set_default_acl(struct inode dir, struct inode inode,
	408	mode_t mode)
	409	{
	410	struct posix_acl dfacl, acl;
	411	int error = 0;
	412
	413	dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
	414	if (IS_ERR(dfacl)) {
	415	error = PTR_ERR(dfacl);
	416	return (error == -EOPNOTSUPP) ? 0 : error;
	417	}
	418	if (!dfacl)
	419	return 0;
	420	acl = posix_acl_clone(dfacl, GFP_KERNEL);
	421	error = -ENOMEM;
	422	if (!acl)
	423	goto out_release_dfacl;
	424	error = posix_acl_create_masq(acl, &mode);
	425	if (error < 0)
	426	goto out_release_acl;
	427	error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
	428	dfacl : NULL);
	429	out_release_acl:
	430	posix_acl_release(acl);
	431	out_release_dfacl:
	432	posix_acl_release(dfacl);
	433	return error;
	434	}