[deliverable/linux.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.h"
#include "v9fs_vfs.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) ||
			((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
		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);
	} else
		retval = -EIO;

	if (!IS_ERR(dacl))
		posix_acl_release(dacl);

	if (!IS_ERR(pacl))
		posix_acl_release(pacl);

	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;
}

struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
{
	struct posix_acl *acl;
	struct v9fs_session_info *v9ses;

	v9ses = v9fs_inode2v9ses(inode);
	if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
			((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
		/*
		 * On access = client  and acl = on mode get the acl
		 * values from the server
		 */
		return NULL;
	}
	return v9fs_get_cached_acl(inode, type);

}

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);

	if (!acl)
		return 0;

	/* 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;
	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) {
		retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
		if (retval)
			return retval;
		retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, acl);
		posix_acl_release(acl);
	}
	return retval;
}

int v9fs_set_create_acl(struct dentry *dentry,
			struct posix_acl **dpacl, struct posix_acl **pacl)
{
	if (dentry) {
		v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, *dpacl);
		v9fs_set_acl(dentry, ACL_TYPE_ACCESS, *pacl);
	}
	posix_acl_release(*dpacl);
	posix_acl_release(*pacl);
	*dpacl = *pacl = NULL;
	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) {
		if (S_ISDIR(mode))
			*dpacl = posix_acl_dup(acl);
		retval = posix_acl_create(&acl, GFP_NOFS, &mode);
		if (retval < 0)
			return retval;
		if (retval > 0)
			*pacl = acl;
		else
			posix_acl_release(acl);
	}
	*modep  = mode;
	return 0;
}

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_dentry2v9ses(dentry);
	/*
	 * 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_dentry2v9ses(dentry);
	/*
	 * 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 (!inode_owner_or_capable(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"
76381a42	24	#include "v9fs.h"
5ffc0cb3	25	#include "v9fs_vfs.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	61	v9ses = v9fs_inode2v9ses(inode);
e782ef71 VJJ	62	if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) \|\|
e782ef71 VJJ	63	((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
76381a42 AK	64	set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
	65	set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
	66	return 0;
	67	}
85ff872d AK	68	/* get the default/access acl values and cache them */
	69	dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
	70	pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
	71
	72	if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
	73	set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
	74	set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
85ff872d AK	75	} else
	76	retval = -EIO;
	77
c61fa0d6 VJJ	78	if (!IS_ERR(dacl))
	79	posix_acl_release(dacl);
	80
	81	if (!IS_ERR(pacl))
	82	posix_acl_release(pacl);
	83
85ff872d AK	84	return retval;
	85	}
	86
	87	static struct posix_acl v9fs_get_cached_acl(struct inode inode, int type)
	88	{
	89	struct posix_acl *acl;
	90	/*
	91	* 9p Always cache the acl value when
	92	* instantiating the inode (v9fs_inode_from_fid)
	93	*/
	94	acl = get_cached_acl(inode, type);
	95	BUG_ON(acl == ACL_NOT_CACHED);
	96	return acl;
	97	}
	98
4e34e719	99	struct posix_acl v9fs_iop_get_acl(struct inode inode, int type)
85ff872d	100	{
76381a42 AK	101	struct posix_acl *acl;
	102	struct v9fs_session_info *v9ses;
	103
	104	v9ses = v9fs_inode2v9ses(inode);
e782ef71 VJJ	105	if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) \|\|
e782ef71 VJJ	106	((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
76381a42	107	/*
e782ef71	108	* On access = client and acl = on mode get the acl
76381a42 AK	109	* values from the server
76381a42 AK	110	*/
4e34e719	111	return NULL;
76381a42	112	}
4e34e719 CH	113	return v9fs_get_cached_acl(inode, type);
4e34e719 CH	114
85ff872d	115	}
7a4566b0	116
6e8dc555 AK	117	static int v9fs_set_acl(struct dentry dentry, int type, struct posix_acl acl)
	118	{
	119	int retval;
	120	char *name;
	121	size_t size;
	122	void *buffer;
	123	struct inode *inode = dentry->d_inode;
	124
	125	set_cached_acl(inode, type, acl);
d344b0fb VJJ	126
	127	if (!acl)
	128	return 0;
	129
6e8dc555 AK	130	/* Set a setxattr request to server */
	131	size = posix_acl_xattr_size(acl->a_count);
	132	buffer = kmalloc(size, GFP_KERNEL);
	133	if (!buffer)
	134	return -ENOMEM;
	135	retval = posix_acl_to_xattr(acl, buffer, size);
	136	if (retval < 0)
	137	goto err_free_out;
	138	switch (type) {
	139	case ACL_TYPE_ACCESS:
	140	name = POSIX_ACL_XATTR_ACCESS;
	141	break;
	142	case ACL_TYPE_DEFAULT:
	143	name = POSIX_ACL_XATTR_DEFAULT;
	144	break;
	145	default:
	146	BUG();
	147	}
	148	retval = v9fs_xattr_set(dentry, name, buffer, size, 0);
	149	err_free_out:
	150	kfree(buffer);
	151	return retval;
	152	}
	153
	154	int v9fs_acl_chmod(struct dentry *dentry)
	155	{
	156	int retval = 0;
bc26ab5f	157	struct posix_acl *acl;
6e8dc555 AK	158	struct inode *inode = dentry->d_inode;
	159
	160	if (S_ISLNK(inode->i_mode))
	161	return -EOPNOTSUPP;
	162	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
	163	if (acl) {
bc26ab5f AV	164	retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	165	if (retval)
	166	return retval;
	167	retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, acl);
6e8dc555	168	posix_acl_release(acl);
6e8dc555 AK	169	}
	170	return retval;
	171	}
	172
ad77dbce	173	int v9fs_set_create_acl(struct dentry *dentry,
1ec95bf3	174	struct posix_acl dpacl, struct posix_acl pacl)
ad77dbce	175	{
1ec95bf3 AV	176	if (dentry) {
	177	v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, *dpacl);
	178	v9fs_set_acl(dentry, ACL_TYPE_ACCESS, *pacl);
	179	}
	180	posix_acl_release(*dpacl);
	181	posix_acl_release(*pacl);
	182	dpacl = pacl = NULL;
ad77dbce AK	183	return 0;
	184	}
	185
	186	int v9fs_acl_mode(struct inode dir, mode_t modep,
	187	struct posix_acl dpacl, struct posix_acl pacl)
	188	{
	189	int retval = 0;
	190	mode_t mode = *modep;
	191	struct posix_acl *acl = NULL;
	192
	193	if (!S_ISLNK(mode)) {
	194	acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
	195	if (IS_ERR(acl))
	196	return PTR_ERR(acl);
	197	if (!acl)
	198	mode &= ~current_umask();
	199	}
	200	if (acl) {
ad77dbce	201	if (S_ISDIR(mode))
1ec95bf3	202	*dpacl = posix_acl_dup(acl);
826cae2f AV	203	retval = posix_acl_create(&acl, GFP_NOFS, &mode);
	204	if (retval < 0)
	205	return retval;
ad77dbce	206	if (retval > 0)
826cae2f	207	*pacl = acl;
1ec95bf3	208	else
826cae2f	209	posix_acl_release(acl);
ad77dbce AK	210	}
	211	*modep = mode;
	212	return 0;
ad77dbce AK	213	}
ad77dbce AK	214
76381a42 AK	215	static int v9fs_remote_get_acl(struct dentry dentry, const char name,
	216	void *buffer, size_t size, int type)
	217	{
	218	char *full_name;
	219
	220	switch (type) {
	221	case ACL_TYPE_ACCESS:
	222	full_name = POSIX_ACL_XATTR_ACCESS;
	223	break;
	224	case ACL_TYPE_DEFAULT:
	225	full_name = POSIX_ACL_XATTR_DEFAULT;
	226	break;
	227	default:
	228	BUG();
	229	}
	230	return v9fs_xattr_get(dentry, full_name, buffer, size);
	231	}
	232
7a4566b0 AK	233	static int v9fs_xattr_get_acl(struct dentry dentry, const char name,
	234	void *buffer, size_t size, int type)
	235	{
76381a42	236	struct v9fs_session_info *v9ses;
7a4566b0 AK	237	struct posix_acl *acl;
	238	int error;
	239
	240	if (strcmp(name, "") != 0)
	241	return -EINVAL;
	242
42869c8a	243	v9ses = v9fs_dentry2v9ses(dentry);
76381a42 AK	244	/*
	245	* We allow set/get/list of acl when access=client is not specified
	246	*/
	247	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	248	return v9fs_remote_get_acl(dentry, name, buffer, size, type);
	249
7a4566b0 AK	250	acl = v9fs_get_cached_acl(dentry->d_inode, type);
	251	if (IS_ERR(acl))
	252	return PTR_ERR(acl);
	253	if (acl == NULL)
	254	return -ENODATA;
	255	error = posix_acl_to_xattr(acl, buffer, size);
	256	posix_acl_release(acl);
	257
	258	return error;
	259	}
	260
76381a42 AK	261	static int v9fs_remote_set_acl(struct dentry dentry, const char name,
	262	const void *value, size_t size,
	263	int flags, int type)
	264	{
	265	char *full_name;
	266
	267	switch (type) {
	268	case ACL_TYPE_ACCESS:
	269	full_name = POSIX_ACL_XATTR_ACCESS;
	270	break;
	271	case ACL_TYPE_DEFAULT:
	272	full_name = POSIX_ACL_XATTR_DEFAULT;
	273	break;
	274	default:
	275	BUG();
	276	}
	277	return v9fs_xattr_set(dentry, full_name, value, size, flags);
	278	}
	279
	280
7a4566b0 AK	281	static int v9fs_xattr_set_acl(struct dentry dentry, const char name,
	282	const void *value, size_t size,
	283	int flags, int type)
	284	{
22d8dcdf AK	285	int retval;
22d8dcdf AK	286	struct posix_acl *acl;
76381a42	287	struct v9fs_session_info *v9ses;
22d8dcdf AK	288	struct inode *inode = dentry->d_inode;
	289
	290	if (strcmp(name, "") != 0)
	291	return -EINVAL;
76381a42	292
42869c8a	293	v9ses = v9fs_dentry2v9ses(dentry);
76381a42 AK	294	/*
	295	* set the attribute on the remote. Without even looking at the
	296	* xattr value. We leave it to the server to validate
	297	*/
	298	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	299	return v9fs_remote_set_acl(dentry, name,
	300	value, size, flags, type);
	301
22d8dcdf AK	302	if (S_ISLNK(inode->i_mode))
22d8dcdf AK	303	return -EOPNOTSUPP;
2e149670	304	if (!inode_owner_or_capable(inode))
22d8dcdf AK	305	return -EPERM;
	306	if (value) {
	307	/* update the cached acl value */
	308	acl = posix_acl_from_xattr(value, size);
	309	if (IS_ERR(acl))
	310	return PTR_ERR(acl);
	311	else if (acl) {
	312	retval = posix_acl_valid(acl);
	313	if (retval)
	314	goto err_out;
	315	}
	316	} else
	317	acl = NULL;
	318
	319	switch (type) {
	320	case ACL_TYPE_ACCESS:
	321	name = POSIX_ACL_XATTR_ACCESS;
	322	if (acl) {
	323	mode_t mode = inode->i_mode;
	324	retval = posix_acl_equiv_mode(acl, &mode);
	325	if (retval < 0)
	326	goto err_out;
	327	else {
	328	struct iattr iattr;
	329	if (retval == 0) {
	330	/*
	331	* ACL can be represented
	332	* by the mode bits. So don't
	333	* update ACL.
	334	*/
	335	acl = NULL;
	336	value = NULL;
	337	size = 0;
	338	}
	339	/* Updte the mode bits */
	340	iattr.ia_mode = ((mode & S_IALLUGO) \|
	341	(inode->i_mode & ~S_IALLUGO));
	342	iattr.ia_valid = ATTR_MODE;
	343	/* FIXME should we update ctime ?
	344	* What is the following setxattr update the
	345	* mode ?
	346	*/
	347	v9fs_vfs_setattr_dotl(dentry, &iattr);
	348	}
	349	}
	350	break;
	351	case ACL_TYPE_DEFAULT:
	352	name = POSIX_ACL_XATTR_DEFAULT;
	353	if (!S_ISDIR(inode->i_mode)) {
6f81c115	354	retval = acl ? -EINVAL : 0;
22d8dcdf AK	355	goto err_out;
	356	}
	357	break;
	358	default:
	359	BUG();
	360	}
	361	retval = v9fs_xattr_set(dentry, name, value, size, flags);
	362	if (!retval)
	363	set_cached_acl(inode, type, acl);
	364	err_out:
	365	posix_acl_release(acl);
	366	return retval;
7a4566b0 AK	367	}
	368
	369	const struct xattr_handler v9fs_xattr_acl_access_handler = {
	370	.prefix = POSIX_ACL_XATTR_ACCESS,
	371	.flags = ACL_TYPE_ACCESS,
	372	.get = v9fs_xattr_get_acl,
	373	.set = v9fs_xattr_set_acl,
	374	};
	375
	376	const struct xattr_handler v9fs_xattr_acl_default_handler = {
	377	.prefix = POSIX_ACL_XATTR_DEFAULT,
	378	.flags = ACL_TYPE_DEFAULT,
	379	.get = v9fs_xattr_get_acl,
	380	.set = v9fs_xattr_set_acl,
	381	};