[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;
}

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

	if (mask & MAY_NOT_BLOCK)
		return -ECHILD;

	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 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);

	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, *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 (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) {
		struct posix_acl *clone;

		if (S_ISDIR(mode))
			*dpacl = posix_acl_dup(acl);
		clone = posix_acl_clone(acl, GFP_NOFS);
		posix_acl_release(acl);
		if (!clone)
			return -ENOMEM;

		retval = posix_acl_create_masq(clone, &mode);
		if (retval < 0) {
			posix_acl_release(clone);
			goto cleanup;
		}
		if (retval > 0)
			*pacl = clone;
		else
			posix_acl_release(clone);
	}
	*modep  = mode;
	return 0;
cleanup:
	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_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
7e40145e	99	int v9fs_check_acl(struct inode *inode, int mask)
85ff872d	100	{
76381a42 AK	101	struct posix_acl *acl;
	102	struct v9fs_session_info *v9ses;
	103
9c2c7039	104	if (mask & MAY_NOT_BLOCK)
b74c79e9 NP	105	return -ECHILD;
b74c79e9 NP	106
76381a42	107	v9ses = v9fs_inode2v9ses(inode);
e782ef71 VJJ	108	if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) \|\|
e782ef71 VJJ	109	((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
76381a42	110	/*
e782ef71	111	* On access = client and acl = on mode get the acl
76381a42 AK	112	* values from the server
	113	*/
	114	return 0;
	115	}
	116	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
85ff872d AK	117
	118	if (IS_ERR(acl))
	119	return PTR_ERR(acl);
	120	if (acl) {
	121	int error = posix_acl_permission(inode, acl, mask);
	122	posix_acl_release(acl);
	123	return error;
	124	}
	125	return -EAGAIN;
	126	}
7a4566b0	127
6e8dc555 AK	128	static int v9fs_set_acl(struct dentry dentry, int type, struct posix_acl acl)
	129	{
	130	int retval;
	131	char *name;
	132	size_t size;
	133	void *buffer;
	134	struct inode *inode = dentry->d_inode;
	135
	136	set_cached_acl(inode, type, acl);
d344b0fb VJJ	137
	138	if (!acl)
	139	return 0;
	140
6e8dc555 AK	141	/* Set a setxattr request to server */
	142	size = posix_acl_xattr_size(acl->a_count);
	143	buffer = kmalloc(size, GFP_KERNEL);
	144	if (!buffer)
	145	return -ENOMEM;
	146	retval = posix_acl_to_xattr(acl, buffer, size);
	147	if (retval < 0)
	148	goto err_free_out;
	149	switch (type) {
	150	case ACL_TYPE_ACCESS:
	151	name = POSIX_ACL_XATTR_ACCESS;
	152	break;
	153	case ACL_TYPE_DEFAULT:
	154	name = POSIX_ACL_XATTR_DEFAULT;
	155	break;
	156	default:
	157	BUG();
	158	}
	159	retval = v9fs_xattr_set(dentry, name, buffer, size, 0);
	160	err_free_out:
	161	kfree(buffer);
	162	return retval;
	163	}
	164
	165	int v9fs_acl_chmod(struct dentry *dentry)
	166	{
	167	int retval = 0;
	168	struct posix_acl acl, clone;
	169	struct inode *inode = dentry->d_inode;
	170
	171	if (S_ISLNK(inode->i_mode))
	172	return -EOPNOTSUPP;
	173	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
	174	if (acl) {
	175	clone = posix_acl_clone(acl, GFP_KERNEL);
	176	posix_acl_release(acl);
	177	if (!clone)
	178	return -ENOMEM;
	179	retval = posix_acl_chmod_masq(clone, inode->i_mode);
	180	if (!retval)
	181	retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, clone);
	182	posix_acl_release(clone);
	183	}
	184	return retval;
	185	}
	186
ad77dbce	187	int v9fs_set_create_acl(struct dentry *dentry,
1ec95bf3	188	struct posix_acl dpacl, struct posix_acl pacl)
ad77dbce	189	{
1ec95bf3 AV	190	if (dentry) {
	191	v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, *dpacl);
	192	v9fs_set_acl(dentry, ACL_TYPE_ACCESS, *pacl);
	193	}
	194	posix_acl_release(*dpacl);
	195	posix_acl_release(*pacl);
	196	dpacl = pacl = NULL;
ad77dbce AK	197	return 0;
	198	}
	199
	200	int v9fs_acl_mode(struct inode dir, mode_t modep,
	201	struct posix_acl dpacl, struct posix_acl pacl)
	202	{
	203	int retval = 0;
	204	mode_t mode = *modep;
	205	struct posix_acl *acl = NULL;
	206
	207	if (!S_ISLNK(mode)) {
	208	acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
	209	if (IS_ERR(acl))
	210	return PTR_ERR(acl);
	211	if (!acl)
	212	mode &= ~current_umask();
	213	}
	214	if (acl) {
	215	struct posix_acl *clone;
	216
	217	if (S_ISDIR(mode))
1ec95bf3	218	*dpacl = posix_acl_dup(acl);
ad77dbce	219	clone = posix_acl_clone(acl, GFP_NOFS);
1ec95bf3	220	posix_acl_release(acl);
ad77dbce	221	if (!clone)
1ec95bf3	222	return -ENOMEM;
ad77dbce AK	223
	224	retval = posix_acl_create_masq(clone, &mode);
	225	if (retval < 0) {
	226	posix_acl_release(clone);
	227	goto cleanup;
	228	}
	229	if (retval > 0)
	230	*pacl = clone;
1ec95bf3 AV	231	else
1ec95bf3 AV	232	posix_acl_release(clone);
ad77dbce AK	233	}
	234	*modep = mode;
	235	return 0;
	236	cleanup:
ad77dbce AK	237	return retval;
	238
	239	}
	240
76381a42 AK	241	static int v9fs_remote_get_acl(struct dentry dentry, const char name,
	242	void *buffer, size_t size, int type)
	243	{
	244	char *full_name;
	245
	246	switch (type) {
	247	case ACL_TYPE_ACCESS:
	248	full_name = POSIX_ACL_XATTR_ACCESS;
	249	break;
	250	case ACL_TYPE_DEFAULT:
	251	full_name = POSIX_ACL_XATTR_DEFAULT;
	252	break;
	253	default:
	254	BUG();
	255	}
	256	return v9fs_xattr_get(dentry, full_name, buffer, size);
	257	}
	258
7a4566b0 AK	259	static int v9fs_xattr_get_acl(struct dentry dentry, const char name,
	260	void *buffer, size_t size, int type)
	261	{
76381a42	262	struct v9fs_session_info *v9ses;
7a4566b0 AK	263	struct posix_acl *acl;
	264	int error;
	265
	266	if (strcmp(name, "") != 0)
	267	return -EINVAL;
	268
42869c8a	269	v9ses = v9fs_dentry2v9ses(dentry);
76381a42 AK	270	/*
	271	* We allow set/get/list of acl when access=client is not specified
	272	*/
	273	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	274	return v9fs_remote_get_acl(dentry, name, buffer, size, type);
	275
7a4566b0 AK	276	acl = v9fs_get_cached_acl(dentry->d_inode, type);
	277	if (IS_ERR(acl))
	278	return PTR_ERR(acl);
	279	if (acl == NULL)
	280	return -ENODATA;
	281	error = posix_acl_to_xattr(acl, buffer, size);
	282	posix_acl_release(acl);
	283
	284	return error;
	285	}
	286
76381a42 AK	287	static int v9fs_remote_set_acl(struct dentry dentry, const char name,
	288	const void *value, size_t size,
	289	int flags, int type)
	290	{
	291	char *full_name;
	292
	293	switch (type) {
	294	case ACL_TYPE_ACCESS:
	295	full_name = POSIX_ACL_XATTR_ACCESS;
	296	break;
	297	case ACL_TYPE_DEFAULT:
	298	full_name = POSIX_ACL_XATTR_DEFAULT;
	299	break;
	300	default:
	301	BUG();
	302	}
	303	return v9fs_xattr_set(dentry, full_name, value, size, flags);
	304	}
	305
	306
7a4566b0 AK	307	static int v9fs_xattr_set_acl(struct dentry dentry, const char name,
	308	const void *value, size_t size,
	309	int flags, int type)
	310	{
22d8dcdf AK	311	int retval;
22d8dcdf AK	312	struct posix_acl *acl;
76381a42	313	struct v9fs_session_info *v9ses;
22d8dcdf AK	314	struct inode *inode = dentry->d_inode;
	315
	316	if (strcmp(name, "") != 0)
	317	return -EINVAL;
76381a42	318
42869c8a	319	v9ses = v9fs_dentry2v9ses(dentry);
76381a42 AK	320	/*
	321	* set the attribute on the remote. Without even looking at the
	322	* xattr value. We leave it to the server to validate
	323	*/
	324	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	325	return v9fs_remote_set_acl(dentry, name,
	326	value, size, flags, type);
	327
22d8dcdf AK	328	if (S_ISLNK(inode->i_mode))
22d8dcdf AK	329	return -EOPNOTSUPP;
2e149670	330	if (!inode_owner_or_capable(inode))
22d8dcdf AK	331	return -EPERM;
	332	if (value) {
	333	/* update the cached acl value */
	334	acl = posix_acl_from_xattr(value, size);
	335	if (IS_ERR(acl))
	336	return PTR_ERR(acl);
	337	else if (acl) {
	338	retval = posix_acl_valid(acl);
	339	if (retval)
	340	goto err_out;
	341	}
	342	} else
	343	acl = NULL;
	344
	345	switch (type) {
	346	case ACL_TYPE_ACCESS:
	347	name = POSIX_ACL_XATTR_ACCESS;
	348	if (acl) {
	349	mode_t mode = inode->i_mode;
	350	retval = posix_acl_equiv_mode(acl, &mode);
	351	if (retval < 0)
	352	goto err_out;
	353	else {
	354	struct iattr iattr;
	355	if (retval == 0) {
	356	/*
	357	* ACL can be represented
	358	* by the mode bits. So don't
	359	* update ACL.
	360	*/
	361	acl = NULL;
	362	value = NULL;
	363	size = 0;
	364	}
	365	/* Updte the mode bits */
	366	iattr.ia_mode = ((mode & S_IALLUGO) \|
	367	(inode->i_mode & ~S_IALLUGO));
	368	iattr.ia_valid = ATTR_MODE;
	369	/* FIXME should we update ctime ?
	370	* What is the following setxattr update the
	371	* mode ?
	372	*/
	373	v9fs_vfs_setattr_dotl(dentry, &iattr);
	374	}
	375	}
	376	break;
	377	case ACL_TYPE_DEFAULT:
	378	name = POSIX_ACL_XATTR_DEFAULT;
	379	if (!S_ISDIR(inode->i_mode)) {
6f81c115	380	retval = acl ? -EINVAL : 0;
22d8dcdf AK	381	goto err_out;
	382	}
	383	break;
	384	default:
	385	BUG();
	386	}
	387	retval = v9fs_xattr_set(dentry, name, value, size, flags);
	388	if (!retval)
	389	set_cached_acl(inode, type, acl);
	390	err_out:
	391	posix_acl_release(acl);
	392	return retval;
7a4566b0 AK	393	}
	394
	395	const struct xattr_handler v9fs_xattr_acl_access_handler = {
	396	.prefix = POSIX_ACL_XATTR_ACCESS,
	397	.flags = ACL_TYPE_ACCESS,
	398	.get = v9fs_xattr_get_acl,
	399	.set = v9fs_xattr_set_acl,
	400	};
	401
	402	const struct xattr_handler v9fs_xattr_acl_default_handler = {
	403	.prefix = POSIX_ACL_XATTR_DEFAULT,
	404	.flags = ACL_TYPE_DEFAULT,
	405	.get = v9fs_xattr_get_acl,
	406	.set = v9fs_xattr_set_acl,
	407	};