[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 <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 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 const struct gfs2_eattr_operations gfs2_user_eaops = {
	.eo_get = gfs2_ea_get_i,
	.eo_set = gfs2_ea_set_i,
	.eo_remove = gfs2_ea_remove_i,
	.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 = gfs2_ea_get_i,
	.eo_set = gfs2_ea_set_i,
	.eo_remove = gfs2_ea_remove_i,
	.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>
b3b94faa DT	17	#include <asm/uaccess.h>
	18
	19	#include "gfs2.h"
5c676f6d	20	#include "incore.h"
b3b94faa DT	21	#include "acl.h"
	22	#include "eaops.h"
	23	#include "eattr.h"
5c676f6d	24	#include "util.h"
b3b94faa DT	25
	26	/**
	27	* gfs2_ea_name2type - get the type of the ea, and truncate type from the name
	28	* @namep: ea name, possibly with type appended
	29	*
	30	* Returns: GFS2_EATYPE_XXX
	31	*/
	32
cca195c5	33	unsigned int gfs2_ea_name2type(const char name, const char *truncated_name)
b3b94faa DT	34	{
	35	unsigned int type;
	36
	37	if (strncmp(name, "system.", 7) == 0) {
	38	type = GFS2_EATYPE_SYS;
	39	if (truncated_name)
cca195c5	40	*truncated_name = name + sizeof("system.") - 1;
b3b94faa DT	41	} else if (strncmp(name, "user.", 5) == 0) {
	42	type = GFS2_EATYPE_USR;
	43	if (truncated_name)
cca195c5	44	*truncated_name = name + sizeof("user.") - 1;
639b6d79 RH	45	} else if (strncmp(name, "security.", 9) == 0) {
	46	type = GFS2_EATYPE_SECURITY;
	47	if (truncated_name)
cca195c5	48	*truncated_name = name + sizeof("security.") - 1;
b3b94faa DT	49	} else {
	50	type = GFS2_EATYPE_UNUSED;
	51	if (truncated_name)
	52	*truncated_name = NULL;
	53	}
	54
	55	return type;
	56	}
	57
b3b94faa DT	58	static int system_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
	59	{
	60	if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
	61	!GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
	62	!capable(CAP_SYS_ADMIN))
	63	return -EPERM;
	64
feaa7bba	65	if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
b3b94faa DT	66	(GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) \|\|
	67	GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
	68	return -EOPNOTSUPP;
	69
b3b94faa DT	70	return gfs2_ea_get_i(ip, er);
	71	}
	72
	73	static int system_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	74	{
	75	int remove = 0;
	76	int error;
	77
	78	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
	79	if (!(er->er_flags & GFS2_ERF_MODE)) {
b60623c2	80	er->er_mode = ip->i_inode.i_mode;
b3b94faa DT	81	er->er_flags \|= GFS2_ERF_MODE;
	82	}
	83	error = gfs2_acl_validate_set(ip, 1, er,
	84	&remove, &er->er_mode);
	85	if (error)
	86	return error;
	87	error = gfs2_ea_set_i(ip, er);
	88	if (error)
	89	return error;
	90	if (remove)
	91	gfs2_ea_remove_i(ip, er);
	92	return 0;
	93
	94	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
	95	error = gfs2_acl_validate_set(ip, 0, er,
	96	&remove, NULL);
	97	if (error)
	98	return error;
	99	if (!remove)
	100	error = gfs2_ea_set_i(ip, er);
	101	else {
	102	error = gfs2_ea_remove_i(ip, er);
	103	if (error == -ENODATA)
	104	error = 0;
	105	}
907b9bce	106	return error;
b3b94faa DT	107	}
	108
	109	return -EPERM;
	110	}
	111
	112	static int system_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	113	{
	114	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
	115	int error = gfs2_acl_validate_remove(ip, 1);
	116	if (error)
	117	return error;
	118
	119	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
	120	int error = gfs2_acl_validate_remove(ip, 0);
	121	if (error)
	122	return error;
	123
	124	} else
	125	return -EPERM;
	126
	127	return gfs2_ea_remove_i(ip, er);
	128	}
	129
4ef29002	130	static const struct gfs2_eattr_operations gfs2_user_eaops = {
bcd40559 FDN	131	.eo_get = gfs2_ea_get_i,
	132	.eo_set = gfs2_ea_set_i,
	133	.eo_remove = gfs2_ea_remove_i,
b3b94faa DT	134	.eo_name = "user",
	135	};
	136
4ef29002	137	const struct gfs2_eattr_operations gfs2_system_eaops = {
b3b94faa DT	138	.eo_get = system_eo_get,
	139	.eo_set = system_eo_set,
	140	.eo_remove = system_eo_remove,
	141	.eo_name = "system",
	142	};
	143
4ef29002	144	static const struct gfs2_eattr_operations gfs2_security_eaops = {
bcd40559 FDN	145	.eo_get = gfs2_ea_get_i,
	146	.eo_set = gfs2_ea_set_i,
	147	.eo_remove = gfs2_ea_remove_i,
639b6d79 RH	148	.eo_name = "security",
	149	};
	150
4ef29002	151	const struct gfs2_eattr_operations *gfs2_ea_ops[] = {
b3b94faa DT	152	NULL,
	153	&gfs2_user_eaops,
	154	&gfs2_system_eaops,
e70409f5	155	&gfs2_security_eaops,
b3b94faa DT	156	};
b3b94faa DT	157