[linux.git] / fs / 9p / acl.c

/*
 * Copyright IBM Corporation, 2010
 * Author Aneesh Kumar K.V <[email protected]>
 *
 * 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"
#include "fid.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(&init_user_ns, 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 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 p9_fid *fid, int type, struct posix_acl *acl)
{
	int retval;
	char *name;
	size_t size;
	void *buffer;
	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(&init_user_ns, 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_fid_xattr_set(fid, 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;
	struct p9_fid *fid = v9fs_fid_lookup(dentry);

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;
	if (IS_ERR(fid))
		return PTR_ERR(fid);
	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;
		set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
		retval = v9fs_set_acl(fid, 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) {
		struct p9_fid *fid = v9fs_fid_lookup(dentry);
		set_cached_acl(dentry->d_inode, ACL_TYPE_DEFAULT, *dpacl);
		set_cached_acl(dentry->d_inode, ACL_TYPE_ACCESS, *pacl);
		if (!IS_ERR(fid)) {
			v9fs_set_acl(fid, ACL_TYPE_DEFAULT, *dpacl);
			v9fs_set_acl(fid, ACL_TYPE_ACCESS, *pacl);
		}
	}
	posix_acl_release(*dpacl);
	posix_acl_release(*pacl);
	*dpacl = *pacl = NULL;
	return 0;
}

int v9fs_acl_mode(struct inode *dir, umode_t *modep,
		  struct posix_acl **dpacl, struct posix_acl **pacl)
{
	int retval = 0;
	umode_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(&init_user_ns, 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(&init_user_ns, 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) {
			umode_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 <[email protected]>
	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"
0f235cae	26	#include "fid.h"
85ff872d AK	27
	28	static struct posix_acl __v9fs_get_acl(struct p9_fid fid, char *name)
	29	{
	30	ssize_t size;
	31	void *value = NULL;
009ca389	32	struct posix_acl *acl = NULL;
85ff872d AK	33
	34	size = v9fs_fid_xattr_get(fid, name, NULL, 0);
	35	if (size > 0) {
	36	value = kzalloc(size, GFP_NOFS);
	37	if (!value)
	38	return ERR_PTR(-ENOMEM);
	39	size = v9fs_fid_xattr_get(fid, name, value, size);
	40	if (size > 0) {
5f3a4a28	41	acl = posix_acl_from_xattr(&init_user_ns, value, size);
85ff872d AK	42	if (IS_ERR(acl))
	43	goto err_out;
	44	}
	45	} else if (size == -ENODATA \|\| size == 0 \|\|
	46	size == -ENOSYS \|\| size == -EOPNOTSUPP) {
	47	acl = NULL;
	48	} else
	49	acl = ERR_PTR(-EIO);
	50
	51	err_out:
	52	kfree(value);
	53	return acl;
	54	}
	55
	56	int v9fs_get_acl(struct inode inode, struct p9_fid fid)
	57	{
	58	int retval = 0;
	59	struct posix_acl pacl, dacl;
76381a42	60	struct v9fs_session_info *v9ses;
85ff872d	61
76381a42	62	v9ses = v9fs_inode2v9ses(inode);
e782ef71 VJJ	63	if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) \|\|
e782ef71 VJJ	64	((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
76381a42 AK	65	set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
	66	set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
	67	return 0;
	68	}
85ff872d AK	69	/* get the default/access acl values and cache them */
	70	dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
	71	pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
	72
	73	if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
	74	set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
	75	set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
85ff872d AK	76	} else
	77	retval = -EIO;
	78
c61fa0d6 VJJ	79	if (!IS_ERR(dacl))
	80	posix_acl_release(dacl);
	81
	82	if (!IS_ERR(pacl))
	83	posix_acl_release(pacl);
	84
85ff872d AK	85	return retval;
	86	}
	87
	88	static struct posix_acl v9fs_get_cached_acl(struct inode inode, int type)
	89	{
	90	struct posix_acl *acl;
	91	/*
	92	* 9p Always cache the acl value when
	93	* instantiating the inode (v9fs_inode_from_fid)
	94	*/
	95	acl = get_cached_acl(inode, type);
	96	BUG_ON(acl == ACL_NOT_CACHED);
	97	return acl;
	98	}
	99
4e34e719	100	struct posix_acl v9fs_iop_get_acl(struct inode inode, int type)
85ff872d	101	{
76381a42 AK	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
0f235cae	117	static int v9fs_set_acl(struct p9_fid fid, int type, struct posix_acl acl)
6e8dc555 AK	118	{
	119	int retval;
	120	char *name;
	121	size_t size;
	122	void *buffer;
d344b0fb VJJ	123	if (!acl)
	124	return 0;
	125
6e8dc555 AK	126	/* Set a setxattr request to server */
	127	size = posix_acl_xattr_size(acl->a_count);
	128	buffer = kmalloc(size, GFP_KERNEL);
	129	if (!buffer)
	130	return -ENOMEM;
5f3a4a28	131	retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
6e8dc555 AK	132	if (retval < 0)
	133	goto err_free_out;
	134	switch (type) {
	135	case ACL_TYPE_ACCESS:
	136	name = POSIX_ACL_XATTR_ACCESS;
	137	break;
	138	case ACL_TYPE_DEFAULT:
	139	name = POSIX_ACL_XATTR_DEFAULT;
	140	break;
	141	default:
	142	BUG();
	143	}
0f235cae	144	retval = v9fs_fid_xattr_set(fid, name, buffer, size, 0);
6e8dc555 AK	145	err_free_out:
	146	kfree(buffer);
	147	return retval;
	148	}
	149
	150	int v9fs_acl_chmod(struct dentry *dentry)
	151	{
	152	int retval = 0;
bc26ab5f	153	struct posix_acl *acl;
6e8dc555	154	struct inode *inode = dentry->d_inode;
0f235cae	155	struct p9_fid *fid = v9fs_fid_lookup(dentry);
6e8dc555 AK	156
	157	if (S_ISLNK(inode->i_mode))
	158	return -EOPNOTSUPP;
0f235cae AV	159	if (IS_ERR(fid))
0f235cae AV	160	return PTR_ERR(fid);
6e8dc555 AK	161	acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
6e8dc555 AK	162	if (acl) {
bc26ab5f AV	163	retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	164	if (retval)
	165	return retval;
7f165aaa	166	set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
0f235cae	167	retval = v9fs_set_acl(fid, 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	176	if (dentry) {
0f235cae	177	struct p9_fid *fid = v9fs_fid_lookup(dentry);
7f165aaa	178	set_cached_acl(dentry->d_inode, ACL_TYPE_DEFAULT, *dpacl);
7f165aaa	179	set_cached_acl(dentry->d_inode, ACL_TYPE_ACCESS, *pacl);
0f235cae AV	180	if (!IS_ERR(fid)) {
	181	v9fs_set_acl(fid, ACL_TYPE_DEFAULT, *dpacl);
	182	v9fs_set_acl(fid, ACL_TYPE_ACCESS, *pacl);
	183	}
1ec95bf3 AV	184	}
	185	posix_acl_release(*dpacl);
	186	posix_acl_release(*pacl);
	187	dpacl = pacl = NULL;
ad77dbce AK	188	return 0;
	189	}
	190
d3fb6120	191	int v9fs_acl_mode(struct inode dir, umode_t modep,
ad77dbce AK	192	struct posix_acl dpacl, struct posix_acl pacl)
	193	{
	194	int retval = 0;
d3fb6120	195	umode_t mode = *modep;
ad77dbce AK	196	struct posix_acl *acl = NULL;
	197
	198	if (!S_ISLNK(mode)) {
	199	acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
	200	if (IS_ERR(acl))
	201	return PTR_ERR(acl);
	202	if (!acl)
	203	mode &= ~current_umask();
	204	}
	205	if (acl) {
ad77dbce	206	if (S_ISDIR(mode))
1ec95bf3	207	*dpacl = posix_acl_dup(acl);
826cae2f AV	208	retval = posix_acl_create(&acl, GFP_NOFS, &mode);
	209	if (retval < 0)
	210	return retval;
ad77dbce	211	if (retval > 0)
826cae2f	212	*pacl = acl;
1ec95bf3	213	else
826cae2f	214	posix_acl_release(acl);
ad77dbce AK	215	}
	216	*modep = mode;
	217	return 0;
ad77dbce AK	218	}
ad77dbce AK	219
76381a42 AK	220	static int v9fs_remote_get_acl(struct dentry dentry, const char name,
	221	void *buffer, size_t size, int type)
	222	{
	223	char *full_name;
	224
	225	switch (type) {
	226	case ACL_TYPE_ACCESS:
	227	full_name = POSIX_ACL_XATTR_ACCESS;
	228	break;
	229	case ACL_TYPE_DEFAULT:
	230	full_name = POSIX_ACL_XATTR_DEFAULT;
	231	break;
	232	default:
	233	BUG();
	234	}
	235	return v9fs_xattr_get(dentry, full_name, buffer, size);
	236	}
	237
7a4566b0 AK	238	static int v9fs_xattr_get_acl(struct dentry dentry, const char name,
	239	void *buffer, size_t size, int type)
	240	{
76381a42	241	struct v9fs_session_info *v9ses;
7a4566b0 AK	242	struct posix_acl *acl;
	243	int error;
	244
	245	if (strcmp(name, "") != 0)
	246	return -EINVAL;
	247
42869c8a	248	v9ses = v9fs_dentry2v9ses(dentry);
76381a42 AK	249	/*
	250	* We allow set/get/list of acl when access=client is not specified
	251	*/
	252	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	253	return v9fs_remote_get_acl(dentry, name, buffer, size, type);
	254
7a4566b0 AK	255	acl = v9fs_get_cached_acl(dentry->d_inode, type);
	256	if (IS_ERR(acl))
	257	return PTR_ERR(acl);
	258	if (acl == NULL)
	259	return -ENODATA;
5f3a4a28	260	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
7a4566b0 AK	261	posix_acl_release(acl);
	262
	263	return error;
	264	}
	265
76381a42 AK	266	static int v9fs_remote_set_acl(struct dentry dentry, const char name,
	267	const void *value, size_t size,
	268	int flags, int type)
	269	{
	270	char *full_name;
	271
	272	switch (type) {
	273	case ACL_TYPE_ACCESS:
	274	full_name = POSIX_ACL_XATTR_ACCESS;
	275	break;
	276	case ACL_TYPE_DEFAULT:
	277	full_name = POSIX_ACL_XATTR_DEFAULT;
	278	break;
	279	default:
	280	BUG();
	281	}
	282	return v9fs_xattr_set(dentry, full_name, value, size, flags);
	283	}
	284
	285
7a4566b0 AK	286	static int v9fs_xattr_set_acl(struct dentry dentry, const char name,
	287	const void *value, size_t size,
	288	int flags, int type)
	289	{
22d8dcdf AK	290	int retval;
22d8dcdf AK	291	struct posix_acl *acl;
76381a42	292	struct v9fs_session_info *v9ses;
22d8dcdf AK	293	struct inode *inode = dentry->d_inode;
	294
	295	if (strcmp(name, "") != 0)
	296	return -EINVAL;
76381a42	297
42869c8a	298	v9ses = v9fs_dentry2v9ses(dentry);
76381a42 AK	299	/*
	300	* set the attribute on the remote. Without even looking at the
	301	* xattr value. We leave it to the server to validate
	302	*/
	303	if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
	304	return v9fs_remote_set_acl(dentry, name,
	305	value, size, flags, type);
	306
22d8dcdf AK	307	if (S_ISLNK(inode->i_mode))
22d8dcdf AK	308	return -EOPNOTSUPP;
2e149670	309	if (!inode_owner_or_capable(inode))
22d8dcdf AK	310	return -EPERM;
	311	if (value) {
	312	/* update the cached acl value */
5f3a4a28	313	acl = posix_acl_from_xattr(&init_user_ns, value, size);
22d8dcdf AK	314	if (IS_ERR(acl))
	315	return PTR_ERR(acl);
	316	else if (acl) {
	317	retval = posix_acl_valid(acl);
	318	if (retval)
	319	goto err_out;
	320	}
	321	} else
	322	acl = NULL;
	323
	324	switch (type) {
	325	case ACL_TYPE_ACCESS:
	326	name = POSIX_ACL_XATTR_ACCESS;
	327	if (acl) {
d6952123	328	umode_t mode = inode->i_mode;
22d8dcdf AK	329	retval = posix_acl_equiv_mode(acl, &mode);
	330	if (retval < 0)
	331	goto err_out;
	332	else {
	333	struct iattr iattr;
	334	if (retval == 0) {
	335	/*
	336	* ACL can be represented
	337	* by the mode bits. So don't
	338	* update ACL.
	339	*/
	340	acl = NULL;
	341	value = NULL;
	342	size = 0;
	343	}
	344	/* Updte the mode bits */
	345	iattr.ia_mode = ((mode & S_IALLUGO) \|
	346	(inode->i_mode & ~S_IALLUGO));
	347	iattr.ia_valid = ATTR_MODE;
	348	/* FIXME should we update ctime ?
	349	* What is the following setxattr update the
	350	* mode ?
	351	*/
	352	v9fs_vfs_setattr_dotl(dentry, &iattr);
	353	}
	354	}
	355	break;
	356	case ACL_TYPE_DEFAULT:
	357	name = POSIX_ACL_XATTR_DEFAULT;
	358	if (!S_ISDIR(inode->i_mode)) {
6f81c115	359	retval = acl ? -EINVAL : 0;
22d8dcdf AK	360	goto err_out;
	361	}
	362	break;
	363	default:
	364	BUG();
	365	}
	366	retval = v9fs_xattr_set(dentry, name, value, size, flags);
	367	if (!retval)
	368	set_cached_acl(inode, type, acl);
	369	err_out:
	370	posix_acl_release(acl);
	371	return retval;
7a4566b0 AK	372	}
	373
	374	const struct xattr_handler v9fs_xattr_acl_access_handler = {
	375	.prefix = POSIX_ACL_XATTR_ACCESS,
	376	.flags = ACL_TYPE_ACCESS,
	377	.get = v9fs_xattr_get_acl,
	378	.set = v9fs_xattr_set_acl,
	379	};
	380
	381	const struct xattr_handler v9fs_xattr_acl_default_handler = {
	382	.prefix = POSIX_ACL_XATTR_DEFAULT,
	383	.flags = ACL_TYPE_DEFAULT,
	384	.get = v9fs_xattr_get_acl,
	385	.set = v9fs_xattr_set_acl,
	386	};