[deliverable/linux.git] / fs / gfs2 / eaops.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/capability.h>
#include <linux/xattr.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "eaops.h"
#include "eattr.h"
#include "util.h"

/**
 * gfs2_ea_name2type - get the type of the ea, and truncate type from the name
 * @namep: ea name, possibly with type appended
 *
 * Returns: GFS2_EATYPE_XXX
 */

unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
{
	unsigned int type;

	if (strncmp(name, "system.", 7) == 0) {
		type = GFS2_EATYPE_SYS;
		if (truncated_name)
			*truncated_name = name + sizeof("system.") - 1;
	} else if (strncmp(name, "user.", 5) == 0) {
		type = GFS2_EATYPE_USR;
		if (truncated_name)
			*truncated_name = name + sizeof("user.") - 1;
	} else if (strncmp(name, "security.", 9) == 0) {
		type = GFS2_EATYPE_SECURITY;
		if (truncated_name)
			*truncated_name = name + sizeof("security.") - 1;
	} else {
		type = GFS2_EATYPE_UNUSED;
		if (truncated_name)
			*truncated_name = NULL;
	}

	return type;
}

static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	return gfs2_ea_get_i(ip, er);
}

static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	return gfs2_ea_set_i(ip, er);
}

static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	return gfs2_ea_remove_i(ip, er);
}

static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
	    !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
	    !capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
	    (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
	     GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
		return -EOPNOTSUPP;

	return gfs2_ea_get_i(ip, er);
}

static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	int remove = 0;
	int error;

	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
		if (!(er->er_flags & GFS2_ERF_MODE)) {
			er->er_mode = ip->i_inode.i_mode;
			er->er_flags |= GFS2_ERF_MODE;
		}
		error = gfs2_acl_validate_set(ip, 1, er,
					      &remove, &er->er_mode);
		if (error)
			return error;
		error = gfs2_ea_set_i(ip, er);
		if (error)
			return error;
		if (remove)
			gfs2_ea_remove_i(ip, er);
		return 0;

	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
		error = gfs2_acl_validate_set(ip, 0, er,
					      &remove, NULL);
		if (error)
			return error;
		if (!remove)
			error = gfs2_ea_set_i(ip, er);
		else {
			error = gfs2_ea_remove_i(ip, er);
			if (error == -ENODATA)
				error = 0;
		}
		return error;
	}

	return -EPERM;
}

static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
		int error = gfs2_acl_validate_remove(ip, 1);
		if (error)
			return error;

	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
		int error = gfs2_acl_validate_remove(ip, 0);
		if (error)
			return error;

	} else
		return -EPERM;

	return gfs2_ea_remove_i(ip, er);
}

static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	return gfs2_ea_get_i(ip, er);
}

static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	return gfs2_ea_set_i(ip, er);
}

static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	return gfs2_ea_remove_i(ip, er);
}

static const struct gfs2_eattr_operations gfs2_user_eaops = {
	.eo_get = user_eo_get,
	.eo_set = user_eo_set,
	.eo_remove = user_eo_remove,
	.eo_name = "user",
};

const struct gfs2_eattr_operations gfs2_system_eaops = {
	.eo_get = system_eo_get,
	.eo_set = system_eo_set,
	.eo_remove = system_eo_remove,
	.eo_name = "system",
};

static const struct gfs2_eattr_operations gfs2_security_eaops = {
	.eo_get = security_eo_get,
	.eo_set = security_eo_set,
	.eo_remove = security_eo_remove,
	.eo_name = "security",
};

const struct gfs2_eattr_operations *gfs2_ea_ops[] = {
	NULL,
	&gfs2_user_eaops,
	&gfs2_system_eaops,
	&gfs2_security_eaops,
};
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
b3b94faa DT	9
b3b94faa DT	10	#include <linux/slab.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/completion.h>
	13	#include <linux/buffer_head.h>
aa0ac365	14	#include <linux/capability.h>
b3b94faa	15	#include <linux/xattr.h>
5c676f6d	16	#include <linux/gfs2_ondisk.h>
7d308590	17	#include <linux/lm_interface.h>
b3b94faa DT	18	#include <asm/uaccess.h>
	19
	20	#include "gfs2.h"
5c676f6d	21	#include "incore.h"
b3b94faa DT	22	#include "acl.h"
	23	#include "eaops.h"
	24	#include "eattr.h"
5c676f6d	25	#include "util.h"
b3b94faa DT	26
	27	/**
	28	* gfs2_ea_name2type - get the type of the ea, and truncate type from the name
	29	* @namep: ea name, possibly with type appended
	30	*
	31	* Returns: GFS2_EATYPE_XXX
	32	*/
	33
cca195c5	34	unsigned int gfs2_ea_name2type(const char name, const char *truncated_name)
b3b94faa DT	35	{
	36	unsigned int type;
	37
	38	if (strncmp(name, "system.", 7) == 0) {
	39	type = GFS2_EATYPE_SYS;
	40	if (truncated_name)
cca195c5	41	*truncated_name = name + sizeof("system.") - 1;
b3b94faa DT	42	} else if (strncmp(name, "user.", 5) == 0) {
	43	type = GFS2_EATYPE_USR;
	44	if (truncated_name)
cca195c5	45	*truncated_name = name + sizeof("user.") - 1;
639b6d79 RH	46	} else if (strncmp(name, "security.", 9) == 0) {
	47	type = GFS2_EATYPE_SECURITY;
	48	if (truncated_name)
cca195c5	49	*truncated_name = name + sizeof("security.") - 1;
b3b94faa DT	50	} else {
	51	type = GFS2_EATYPE_UNUSED;
	52	if (truncated_name)
	53	*truncated_name = NULL;
	54	}
	55
	56	return type;
	57	}
	58
	59	static int user_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
	60	{
b3b94faa DT	61	return gfs2_ea_get_i(ip, er);
	62	}
	63
	64	static int user_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	65	{
b3b94faa DT	66	return gfs2_ea_set_i(ip, er);
	67	}
	68
	69	static int user_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	70	{
b3b94faa DT	71	return gfs2_ea_remove_i(ip, er);
	72	}
	73
	74	static int system_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
	75	{
	76	if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
	77	!GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
	78	!capable(CAP_SYS_ADMIN))
	79	return -EPERM;
	80
feaa7bba	81	if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
b3b94faa DT	82	(GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) \|\|
	83	GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
	84	return -EOPNOTSUPP;
	85
b3b94faa DT	86	return gfs2_ea_get_i(ip, er);
	87	}
	88
	89	static int system_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	90	{
	91	int remove = 0;
	92	int error;
	93
	94	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
	95	if (!(er->er_flags & GFS2_ERF_MODE)) {
b60623c2	96	er->er_mode = ip->i_inode.i_mode;
b3b94faa DT	97	er->er_flags \|= GFS2_ERF_MODE;
	98	}
	99	error = gfs2_acl_validate_set(ip, 1, er,
	100	&remove, &er->er_mode);
	101	if (error)
	102	return error;
	103	error = gfs2_ea_set_i(ip, er);
	104	if (error)
	105	return error;
	106	if (remove)
	107	gfs2_ea_remove_i(ip, er);
	108	return 0;
	109
	110	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
	111	error = gfs2_acl_validate_set(ip, 0, er,
	112	&remove, NULL);
	113	if (error)
	114	return error;
	115	if (!remove)
	116	error = gfs2_ea_set_i(ip, er);
	117	else {
	118	error = gfs2_ea_remove_i(ip, er);
	119	if (error == -ENODATA)
	120	error = 0;
	121	}
907b9bce	122	return error;
b3b94faa DT	123	}
	124
	125	return -EPERM;
	126	}
	127
	128	static int system_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	129	{
	130	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
	131	int error = gfs2_acl_validate_remove(ip, 1);
	132	if (error)
	133	return error;
	134
	135	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
	136	int error = gfs2_acl_validate_remove(ip, 0);
	137	if (error)
	138	return error;
	139
	140	} else
	141	return -EPERM;
	142
	143	return gfs2_ea_remove_i(ip, er);
	144	}
	145
639b6d79 RH	146	static int security_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
639b6d79 RH	147	{
639b6d79 RH	148	return gfs2_ea_get_i(ip, er);
	149	}
	150
	151	static int security_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	152	{
639b6d79 RH	153	return gfs2_ea_set_i(ip, er);
	154	}
	155
	156	static int security_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	157	{
639b6d79 RH	158	return gfs2_ea_remove_i(ip, er);
	159	}
	160
4ef29002	161	static const struct gfs2_eattr_operations gfs2_user_eaops = {
b3b94faa DT	162	.eo_get = user_eo_get,
	163	.eo_set = user_eo_set,
	164	.eo_remove = user_eo_remove,
	165	.eo_name = "user",
	166	};
	167
4ef29002	168	const struct gfs2_eattr_operations gfs2_system_eaops = {
b3b94faa DT	169	.eo_get = system_eo_get,
	170	.eo_set = system_eo_set,
	171	.eo_remove = system_eo_remove,
	172	.eo_name = "system",
	173	};
	174
4ef29002	175	static const struct gfs2_eattr_operations gfs2_security_eaops = {
639b6d79 RH	176	.eo_get = security_eo_get,
	177	.eo_set = security_eo_set,
	178	.eo_remove = security_eo_remove,
	179	.eo_name = "security",
	180	};
	181
4ef29002	182	const struct gfs2_eattr_operations *gfs2_ea_ops[] = {
b3b94faa DT	183	NULL,
	184	&gfs2_user_eaops,
	185	&gfs2_system_eaops,
e70409f5	186	&gfs2_security_eaops,
b3b94faa DT	187	};
b3b94faa DT	188