[mirror_ubuntu-bionic-kernel.git] / fs / 9p / acl.c

/*
 * Copyright IBM Corporation, 2010
 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/posix_acl_xattr.h>
#include "xattr.h"
#include "acl.h"
#include "v9fs_vfs.h"
#include "v9fs.h"

static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
{
	ssize_t size;
	void *value = NULL;
	struct posix_acl *acl = NULL;

	size = v9fs_fid_xattr_get(fid, name, NULL, 0);
	if (size > 0) {
		value = kzalloc(size, GFP_NOFS);
		if (!value)
			return ERR_PTR(-ENOMEM);
		size = v9fs_fid_xattr_get(fid, name, value, size);
		if (size > 0) {
			acl = posix_acl_from_xattr(value, size);
			if (IS_ERR(acl))
				goto err_out;
		}
	} else if (size == -ENODATA || size == 0 ||
		   size == -ENOSYS || size == -EOPNOTSUPP) {
		acl = NULL;
	} else
		acl = ERR_PTR(-EIO);

err_out:
	kfree(value);
	return acl;
}

int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
{
	int retval = 0;
	struct posix_acl *pacl, *dacl;
	struct v9fs_session_info *v9ses;

	v9ses = v9fs_inode2v9ses(inode);
	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) {
		set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
		set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
		return 0;
	}
	/* get the default/access acl values and cache them */
	dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
	pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);

	if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
		set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
		set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
		posix_acl_release(dacl);
		posix_acl_release(pacl);
	} else
		retval = -EIO;

	return retval;
}

static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
{
	struct posix_acl *acl;
	/*
	 * 9p Always cache the acl value when
	 * instantiating the inode (v9fs_inode_from_fid)
	 */
	acl = get_cached_acl(inode, type);
	BUG_ON(acl == ACL_NOT_CACHED);
	return acl;
}

int v9fs_check_acl(struct inode *inode, int mask, unsigned int flags)
{
	struct posix_acl *acl;
	struct v9fs_session_info *v9ses;

	if (flags & IPERM_FLAG_RCU)
		return -ECHILD;

	v9ses = v9fs_inode2v9ses(inode);
	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) {
		/*
		 * On access = client mode get the acl
		 * values from the server
		 */
		return 0;
	}
	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);

	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl) {
		int error = posix_acl_permission(inode, acl, mask);
		posix_acl_release(acl);
		return error;
	}
	return -EAGAIN;
}

static int v9fs_set_acl(struct dentry *dentry, int type, struct posix_acl *acl)
{
	int retval;
	char *name;
	size_t size;
	void *buffer;
	struct inode *inode = dentry->d_inode;

	set_cached_acl(inode, type, acl);
	/* Set a setxattr request to server */
	size = posix_acl_xattr_size(acl->a_count);
	buffer = kmalloc(size, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;
	retval = posix_acl_to_xattr(acl, buffer, size);
	if (retval < 0)
		goto err_free_out;
	switch (type) {
	case ACL_TYPE_ACCESS:
		name = POSIX_ACL_XATTR_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = POSIX_ACL_XATTR_DEFAULT;
		break;
	default:
		BUG();
	}
	retval = v9fs_xattr_set(dentry, name, buffer, size, 0);
err_free_out:
	kfree(buffer);
	return retval;
}

int v9fs_acl_chmod(struct dentry *dentry)
{
	int retval = 0;
	struct posix_acl *acl, *clone;
	struct inode *inode = dentry->d_inode;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;
	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
	if (acl) {
		clone = posix_acl_clone(acl, GFP_KERNEL);
		posix_acl_release(acl);
		if (!clone)
			return -ENOMEM;
		retval = posix_acl_chmod_masq(clone, inode->i_mode);
		if (!retval)
			retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, clone);
		posix_acl_release(clone);
	}
	return retval;
}

int v9fs_set_create_acl(struct dentry *dentry,
			struct posix_acl *dpacl, struct posix_acl *pacl)
{
	if (dpacl)
		v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, dpacl);
	if (pacl)
		v9fs_set_acl(dentry, ACL_TYPE_ACCESS, pacl);
	posix_acl_release(dpacl);
	posix_acl_release(pacl);
	return 0;
}

int v9fs_acl_mode(struct inode *dir, mode_t *modep,
		  struct posix_acl **dpacl, struct posix_acl **pacl)
{
	int retval = 0;
	mode_t mode = *modep;
	struct posix_acl *acl = NULL;

	if (!S_ISLNK(mode)) {
		acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
		if (IS_ERR(acl))
			return PTR_ERR(acl);
		if (!acl)
			mode &= ~current_umask();
	}
	if (acl) {
		struct posix_acl *clone;

		if (S_ISDIR(mode))
			*dpacl = acl;
		clone = posix_acl_clone(acl, GFP_NOFS);
		retval = -ENOMEM;
		if (!clone)
			goto cleanup;

		retval = posix_acl_create_masq(clone, &mode);
		if (retval < 0) {
			posix_acl_release(clone);
			goto cleanup;
		}
		if (retval > 0)
			*pacl = clone;
	}
	*modep  = mode;
	return 0;
cleanup:
	posix_acl_release(acl);
	return retval;

}

static int v9fs_remote_get_acl(struct dentry *dentry, const char *name,
			       void *buffer, size_t size, int type)
{
	char *full_name;

	switch (type) {
	case ACL_TYPE_ACCESS:
		full_name =  POSIX_ACL_XATTR_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		full_name = POSIX_ACL_XATTR_DEFAULT;
		break;
	default:
		BUG();
	}
	return v9fs_xattr_get(dentry, full_name, buffer, size);
}

static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
			      void *buffer, size_t size, int type)
{
	struct v9fs_session_info *v9ses;
	struct posix_acl *acl;
	int error;

	if (strcmp(name, "") != 0)
		return -EINVAL;

	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	/*
	 * We allow set/get/list of acl when access=client is not specified
	 */
	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
		return v9fs_remote_get_acl(dentry, name, buffer, size, type);

	acl = v9fs_get_cached_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl == NULL)
		return -ENODATA;
	error = posix_acl_to_xattr(acl, buffer, size);
	posix_acl_release(acl);

	return error;
}

static int v9fs_remote_set_acl(struct dentry *dentry, const char *name,
			      const void *value, size_t size,
			      int flags, int type)
{
	char *full_name;

	switch (type) {
	case ACL_TYPE_ACCESS:
		full_name =  POSIX_ACL_XATTR_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		full_name = POSIX_ACL_XATTR_DEFAULT;
		break;
	default:
		BUG();
	}
	return v9fs_xattr_set(dentry, full_name, value, size, flags);
}


static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name,
			      const void *value, size_t size,
			      int flags, int type)
{
	int retval;
	struct posix_acl *acl;
	struct v9fs_session_info *v9ses;
	struct inode *inode = dentry->d_inode;

	if (strcmp(name, "") != 0)
		return -EINVAL;

	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	/*
	 * set the attribute on the remote. Without even looking at the
	 * xattr value. We leave it to the server to validate
	 */
	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
		return v9fs_remote_set_acl(dentry, name,
					   value, size, flags, type);

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;
	if (!is_owner_or_cap(inode))
		return -EPERM;
	if (value) {
		/* update the cached acl value */
		acl = posix_acl_from_xattr(value, size);
		if (IS_ERR(acl))
			return PTR_ERR(acl);
		else if (acl) {
			retval = posix_acl_valid(acl);
			if (retval)
				goto err_out;
		}
	} else
		acl = NULL;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = POSIX_ACL_XATTR_ACCESS;
		if (acl) {
			mode_t mode = inode->i_mode;
			retval = posix_acl_equiv_mode(acl, &mode);
			if (retval < 0)
				goto err_out;
			else {
				struct iattr iattr;
				if (retval == 0) {
					/*
					 * ACL can be represented
					 * by the mode bits. So don't
					 * update ACL.
					 */
					acl = NULL;
					value = NULL;
					size = 0;
				}
				/* Updte the mode bits */
				iattr.ia_mode = ((mode & S_IALLUGO) |
						 (inode->i_mode & ~S_IALLUGO));
				iattr.ia_valid = ATTR_MODE;
				/* FIXME should we update ctime ?
				 * What is the following setxattr update the
				 * mode ?
				 */
				v9fs_vfs_setattr_dotl(dentry, &iattr);
			}
		}
		break;
	case ACL_TYPE_DEFAULT:
		name = POSIX_ACL_XATTR_DEFAULT;
		if (!S_ISDIR(inode->i_mode)) {
			retval = acl ? -EINVAL : 0;
			goto err_out;
		}
		break;
	default:
		BUG();
	}
	retval = v9fs_xattr_set(dentry, name, value, size, flags);
	if (!retval)
		set_cached_acl(inode, type, acl);
err_out:
	posix_acl_release(acl);
	return retval;
}

const struct xattr_handler v9fs_xattr_acl_access_handler = {
	.prefix	= POSIX_ACL_XATTR_ACCESS,
	.flags	= ACL_TYPE_ACCESS,
	.get	= v9fs_xattr_get_acl,
	.set	= v9fs_xattr_set_acl,
};

const struct xattr_handler v9fs_xattr_acl_default_handler = {
	.prefix	= POSIX_ACL_XATTR_DEFAULT,
	.flags	= ACL_TYPE_DEFAULT,
	.get	= v9fs_xattr_get_acl,
	.set	= v9fs_xattr_set_acl,
};
Commit	Line	Data
85ff872d AK	1	/*
	2	* Copyright IBM Corporation, 2010
	3	* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of version 2.1 of the GNU Lesser General Public License
	7	* as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it would be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/fs.h>
	17	#include <net/9p/9p.h>
	18	#include <net/9p/client.h>
	19	#include <linux/slab.h>
22d8dcdf	20	#include <linux/sched.h>
85ff872d AK	21	#include <linux/posix_acl_xattr.h>
	22	#include "xattr.h"
	23	#include "acl.h"
22d8dcdf	24	#include "v9fs_vfs.h"
76381a42	25	#include "v9fs.h"
85ff872d AK	26
	27	static struct posix_acl __v9fs_get_acl(struct p9_fid fid, char *name)
	28	{
	29	ssize_t size;
	30	void *value = NULL;
009ca389	31	struct posix_acl *acl = NULL;
85ff872d AK	32
	33	size = v9fs_fid_xattr_get(fid, name, NULL, 0);
	34	if (size > 0) {
	35	value = kzalloc(size, GFP_NOFS);
	36	if (!value)
	37	return ERR_PTR(-ENOMEM);
	38	size = v9fs_fid_xattr_get(fid, name, value, size);
	39	if (size > 0) {
	40	acl = posix_acl_from_xattr(value, size);
	41	if (IS_ERR(acl))
	42	goto err_out;
	43	}
	44	} else if (size == -ENODATA \|\| size == 0 \|\|
	45	size == -ENOSYS \|\| size == -EOPNOTSUPP) {
	46	acl = NULL;
	47	} else
	48	acl = ERR_PTR(-EIO);
	49
	50	err_out:
	51	kfree(value);
	52	return acl;
	53	}
	54
	55	int v9fs_get_acl(struct inode inode, struct p9_fid fid)
	56	{
	57	int retval = 0;
	58	struct posix_acl pacl, dacl;
76381a42	59	struct v9fs_session_info *v9ses;
85ff872d	60
76381a42 AK	61	v9ses = v9fs_inode2v9ses(inode);
	62	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) {
	63	set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
	64	set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
	65	return 0;
	66	}
85ff872d AK	67	/* get the default/access acl values and cache them */
	68	dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
	69	pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
	70
	71	if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
	72	set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
	73	set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
	74	posix_acl_release(dacl);
	75	posix_acl_release(pacl);
	76	} else
	77	retval = -EIO;
	78
	79	return retval;
	80	}
	81
	82	static struct posix_acl v9fs_get_cached_acl(struct inode inode, int type)
	83	{
	84	struct posix_acl *acl;
	85	/*
	86	* 9p Always cache the acl value when
	87	* instantiating the inode (v9fs_inode_from_fid)
	88	*/
	89	acl = get_cached_acl(inode, type);
	90	BUG_ON(acl == ACL_NOT_CACHED);
	91	return acl;
	92	}
	93
b74c79e9	94	int v9fs_check_acl(struct inode *inode, int mask, unsigned int flags)
85ff872d	95	{
76381a42 AK	96	struct posix_acl *acl;
	97	struct v9fs_session_info *v9ses;
	98
b74c79e9 NP	99	if (flags & IPERM_FLAG_RCU)
	100	return -ECHILD;
	101
76381a42 AK	102	v9ses = v9fs_inode2v9ses(inode);
	103	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) {
	104	/*
	105	* On access = client mode get the acl
	106	* values from the server
	107	*/
	108	return 0;
	109	}
	110	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
85ff872d AK	111
	112	if (IS_ERR(acl))
	113	return PTR_ERR(acl);
	114	if (acl) {
	115	int error = posix_acl_permission(inode, acl, mask);
	116	posix_acl_release(acl);
	117	return error;
	118	}
	119	return -EAGAIN;
	120	}
7a4566b0	121
6e8dc555 AK	122	static int v9fs_set_acl(struct dentry dentry, int type, struct posix_acl acl)
	123	{
	124	int retval;
	125	char *name;
	126	size_t size;
	127	void *buffer;
	128	struct inode *inode = dentry->d_inode;
	129
	130	set_cached_acl(inode, type, acl);
	131	/* Set a setxattr request to server */
	132	size = posix_acl_xattr_size(acl->a_count);
	133	buffer = kmalloc(size, GFP_KERNEL);
	134	if (!buffer)
	135	return -ENOMEM;
	136	retval = posix_acl_to_xattr(acl, buffer, size);
	137	if (retval < 0)
	138	goto err_free_out;
	139	switch (type) {
	140	case ACL_TYPE_ACCESS:
	141	name = POSIX_ACL_XATTR_ACCESS;
	142	break;
	143	case ACL_TYPE_DEFAULT:
	144	name = POSIX_ACL_XATTR_DEFAULT;
	145	break;
	146	default:
	147	BUG();
	148	}
	149	retval = v9fs_xattr_set(dentry, name, buffer, size, 0);
	150	err_free_out:
	151	kfree(buffer);
	152	return retval;
	153	}
	154
	155	int v9fs_acl_chmod(struct dentry *dentry)
	156	{
	157	int retval = 0;
	158	struct posix_acl acl, clone;
	159	struct inode *inode = dentry->d_inode;
	160
	161	if (S_ISLNK(inode->i_mode))
	162	return -EOPNOTSUPP;
	163	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
	164	if (acl) {
	165	clone = posix_acl_clone(acl, GFP_KERNEL);
	166	posix_acl_release(acl);
	167	if (!clone)
	168	return -ENOMEM;
	169	retval = posix_acl_chmod_masq(clone, inode->i_mode);
	170	if (!retval)
	171	retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, clone);
	172	posix_acl_release(clone);
	173	}
	174	return retval;
	175	}
	176
ad77dbce AK	177	int v9fs_set_create_acl(struct dentry *dentry,
	178	struct posix_acl dpacl, struct posix_acl pacl)
	179	{
	180	if (dpacl)
	181	v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, dpacl);
	182	if (pacl)
	183	v9fs_set_acl(dentry, ACL_TYPE_ACCESS, pacl);
	184	posix_acl_release(dpacl);
	185	posix_acl_release(pacl);
	186	return 0;
	187	}
	188
	189	int v9fs_acl_mode(struct inode dir, mode_t modep,
	190	struct posix_acl dpacl, struct posix_acl pacl)
	191	{
	192	int retval = 0;
	193	mode_t mode = *modep;
	194	struct posix_acl *acl = NULL;
	195
	196	if (!S_ISLNK(mode)) {
	197	acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
	198	if (IS_ERR(acl))
	199	return PTR_ERR(acl);
	200	if (!acl)
	201	mode &= ~current_umask();
	202	}
	203	if (acl) {
	204	struct posix_acl *clone;
	205
	206	if (S_ISDIR(mode))
	207	*dpacl = acl;
	208	clone = posix_acl_clone(acl, GFP_NOFS);
	209	retval = -ENOMEM;
	210	if (!clone)
	211	goto cleanup;
	212
	213	retval = posix_acl_create_masq(clone, &mode);
	214	if (retval < 0) {
	215	posix_acl_release(clone);
	216	goto cleanup;
	217	}
	218	if (retval > 0)
	219	*pacl = clone;
	220	}
	221	*modep = mode;
	222	return 0;
	223	cleanup:
	224	posix_acl_release(acl);
	225	return retval;
	226
	227	}
	228
76381a42 AK	229	static int v9fs_remote_get_acl(struct dentry dentry, const char name,
	230	void *buffer, size_t size, int type)
	231	{
	232	char *full_name;
	233
	234	switch (type) {
	235	case ACL_TYPE_ACCESS:
	236	full_name = POSIX_ACL_XATTR_ACCESS;
	237	break;
	238	case ACL_TYPE_DEFAULT:
	239	full_name = POSIX_ACL_XATTR_DEFAULT;
	240	break;
	241	default:
	242	BUG();
	243	}
	244	return v9fs_xattr_get(dentry, full_name, buffer, size);
	245	}
	246
7a4566b0 AK	247	static int v9fs_xattr_get_acl(struct dentry dentry, const char name,
	248	void *buffer, size_t size, int type)
	249	{
76381a42	250	struct v9fs_session_info *v9ses;
7a4566b0 AK	251	struct posix_acl *acl;
	252	int error;
	253
	254	if (strcmp(name, "") != 0)
	255	return -EINVAL;
	256
76381a42 AK	257	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	258	/*
	259	* We allow set/get/list of acl when access=client is not specified
	260	*/
	261	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	262	return v9fs_remote_get_acl(dentry, name, buffer, size, type);
	263
7a4566b0 AK	264	acl = v9fs_get_cached_acl(dentry->d_inode, type);
	265	if (IS_ERR(acl))
	266	return PTR_ERR(acl);
	267	if (acl == NULL)
	268	return -ENODATA;
	269	error = posix_acl_to_xattr(acl, buffer, size);
	270	posix_acl_release(acl);
	271
	272	return error;
	273	}
	274
76381a42 AK	275	static int v9fs_remote_set_acl(struct dentry dentry, const char name,
	276	const void *value, size_t size,
	277	int flags, int type)
	278	{
	279	char *full_name;
	280
	281	switch (type) {
	282	case ACL_TYPE_ACCESS:
	283	full_name = POSIX_ACL_XATTR_ACCESS;
	284	break;
	285	case ACL_TYPE_DEFAULT:
	286	full_name = POSIX_ACL_XATTR_DEFAULT;
	287	break;
	288	default:
	289	BUG();
	290	}
	291	return v9fs_xattr_set(dentry, full_name, value, size, flags);
	292	}
	293
	294
7a4566b0 AK	295	static int v9fs_xattr_set_acl(struct dentry dentry, const char name,
	296	const void *value, size_t size,
	297	int flags, int type)
	298	{
22d8dcdf AK	299	int retval;
22d8dcdf AK	300	struct posix_acl *acl;
76381a42	301	struct v9fs_session_info *v9ses;
22d8dcdf AK	302	struct inode *inode = dentry->d_inode;
	303
	304	if (strcmp(name, "") != 0)
	305	return -EINVAL;
76381a42 AK	306
	307	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	308	/*
	309	* set the attribute on the remote. Without even looking at the
	310	* xattr value. We leave it to the server to validate
	311	*/
	312	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	313	return v9fs_remote_set_acl(dentry, name,
	314	value, size, flags, type);
	315
22d8dcdf AK	316	if (S_ISLNK(inode->i_mode))
	317	return -EOPNOTSUPP;
	318	if (!is_owner_or_cap(inode))
	319	return -EPERM;
	320	if (value) {
	321	/* update the cached acl value */
	322	acl = posix_acl_from_xattr(value, size);
	323	if (IS_ERR(acl))
	324	return PTR_ERR(acl);
	325	else if (acl) {
	326	retval = posix_acl_valid(acl);
	327	if (retval)
	328	goto err_out;
	329	}
	330	} else
	331	acl = NULL;
	332
	333	switch (type) {
	334	case ACL_TYPE_ACCESS:
	335	name = POSIX_ACL_XATTR_ACCESS;
	336	if (acl) {
	337	mode_t mode = inode->i_mode;
	338	retval = posix_acl_equiv_mode(acl, &mode);
	339	if (retval < 0)
	340	goto err_out;
	341	else {
	342	struct iattr iattr;
	343	if (retval == 0) {
	344	/*
	345	* ACL can be represented
	346	* by the mode bits. So don't
	347	* update ACL.
	348	*/
	349	acl = NULL;
	350	value = NULL;
	351	size = 0;
	352	}
	353	/* Updte the mode bits */
	354	iattr.ia_mode = ((mode & S_IALLUGO) \|
	355	(inode->i_mode & ~S_IALLUGO));
	356	iattr.ia_valid = ATTR_MODE;
	357	/* FIXME should we update ctime ?
	358	* What is the following setxattr update the
	359	* mode ?
	360	*/
	361	v9fs_vfs_setattr_dotl(dentry, &iattr);
	362	}
	363	}
	364	break;
	365	case ACL_TYPE_DEFAULT:
	366	name = POSIX_ACL_XATTR_DEFAULT;
	367	if (!S_ISDIR(inode->i_mode)) {
6f81c115	368	retval = acl ? -EINVAL : 0;
22d8dcdf AK	369	goto err_out;
	370	}
	371	break;
	372	default:
	373	BUG();
	374	}
	375	retval = v9fs_xattr_set(dentry, name, value, size, flags);
	376	if (!retval)
	377	set_cached_acl(inode, type, acl);
	378	err_out:
	379	posix_acl_release(acl);
	380	return retval;
7a4566b0 AK	381	}
	382
	383	const struct xattr_handler v9fs_xattr_acl_access_handler = {
	384	.prefix = POSIX_ACL_XATTR_ACCESS,
	385	.flags = ACL_TYPE_ACCESS,
	386	.get = v9fs_xattr_get_acl,
	387	.set = v9fs_xattr_set_acl,
	388	};
	389
	390	const struct xattr_handler v9fs_xattr_acl_default_handler = {
	391	.prefix = POSIX_ACL_XATTR_DEFAULT,
	392	.flags = ACL_TYPE_DEFAULT,
	393	.get = v9fs_xattr_get_acl,
	394	.set = v9fs_xattr_set_acl,
	395	};