[mirror_ubuntu-artful-kernel.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/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)
{
	struct inode *inode = &ip->i_inode;
	int error = permission(inode, MAY_READ, NULL);
	if (error)
		return error;

	return gfs2_ea_get_i(ip, er);
}

static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	struct inode *inode = &ip->i_inode;

	if (S_ISREG(inode->i_mode) ||
	    (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
		int error = permission(inode, MAY_WRITE, NULL);
		if (error)
			return error;
	} else
		return -EPERM;

	return gfs2_ea_set_i(ip, er);
}

static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	struct inode *inode = &ip->i_inode;

	if (S_ISREG(inode->i_mode) ||
	    (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
		int error = permission(inode, MAY_WRITE, NULL);
		if (error)
			return error;
	} else
		return -EPERM;

	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)
{
	struct inode *inode = &ip->i_inode;
	int error = permission(inode, MAY_READ, NULL);
	if (error)
		return error;

	return gfs2_ea_get_i(ip, er);
}

static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	struct inode *inode = &ip->i_inode;
	int error = permission(inode, MAY_WRITE, NULL);
	if (error)
		return error;

	return gfs2_ea_set_i(ip, er);
}

static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
{
	struct inode *inode = &ip->i_inode;
	int error = permission(inode, MAY_WRITE, NULL);
	if (error)
		return error;

	return gfs2_ea_remove_i(ip, er);
}

static 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",
};

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 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",
};

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>
	14	#include <linux/xattr.h>
5c676f6d	15	#include <linux/gfs2_ondisk.h>
7d308590	16	#include <linux/lm_interface.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
	58	static int user_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
	59	{
feaa7bba	60	struct inode *inode = &ip->i_inode;
b3b94faa DT	61	int error = permission(inode, MAY_READ, NULL);
	62	if (error)
	63	return error;
	64
	65	return gfs2_ea_get_i(ip, er);
	66	}
	67
	68	static int user_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	69	{
feaa7bba	70	struct inode *inode = &ip->i_inode;
b3b94faa DT	71
	72	if (S_ISREG(inode->i_mode) \|\|
	73	(S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
	74	int error = permission(inode, MAY_WRITE, NULL);
	75	if (error)
	76	return error;
	77	} else
	78	return -EPERM;
	79
	80	return gfs2_ea_set_i(ip, er);
	81	}
	82
	83	static int user_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	84	{
feaa7bba	85	struct inode *inode = &ip->i_inode;
b3b94faa DT	86
	87	if (S_ISREG(inode->i_mode) \|\|
	88	(S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
	89	int error = permission(inode, MAY_WRITE, NULL);
	90	if (error)
	91	return error;
	92	} else
	93	return -EPERM;
	94
	95	return gfs2_ea_remove_i(ip, er);
	96	}
	97
	98	static int system_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
	99	{
	100	if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
	101	!GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
	102	!capable(CAP_SYS_ADMIN))
	103	return -EPERM;
	104
feaa7bba	105	if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
b3b94faa DT	106	(GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) \|\|
	107	GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
	108	return -EOPNOTSUPP;
	109
	110
	111
	112	return gfs2_ea_get_i(ip, er);
	113	}
	114
	115	static int system_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	116	{
	117	int remove = 0;
	118	int error;
	119
	120	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
	121	if (!(er->er_flags & GFS2_ERF_MODE)) {
b60623c2	122	er->er_mode = ip->i_inode.i_mode;
b3b94faa DT	123	er->er_flags \|= GFS2_ERF_MODE;
	124	}
	125	error = gfs2_acl_validate_set(ip, 1, er,
	126	&remove, &er->er_mode);
	127	if (error)
	128	return error;
	129	error = gfs2_ea_set_i(ip, er);
	130	if (error)
	131	return error;
	132	if (remove)
	133	gfs2_ea_remove_i(ip, er);
	134	return 0;
	135
	136	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
	137	error = gfs2_acl_validate_set(ip, 0, er,
	138	&remove, NULL);
	139	if (error)
	140	return error;
	141	if (!remove)
	142	error = gfs2_ea_set_i(ip, er);
	143	else {
	144	error = gfs2_ea_remove_i(ip, er);
	145	if (error == -ENODATA)
	146	error = 0;
	147	}
907b9bce	148	return error;
b3b94faa DT	149	}
	150
	151	return -EPERM;
	152	}
	153
	154	static int system_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	155	{
	156	if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
	157	int error = gfs2_acl_validate_remove(ip, 1);
	158	if (error)
	159	return error;
	160
	161	} else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
	162	int error = gfs2_acl_validate_remove(ip, 0);
	163	if (error)
	164	return error;
	165
	166	} else
	167	return -EPERM;
	168
	169	return gfs2_ea_remove_i(ip, er);
	170	}
	171
639b6d79 RH	172	static int security_eo_get(struct gfs2_inode ip, struct gfs2_ea_request er)
639b6d79 RH	173	{
feaa7bba	174	struct inode *inode = &ip->i_inode;
639b6d79 RH	175	int error = permission(inode, MAY_READ, NULL);
	176	if (error)
	177	return error;
	178
	179	return gfs2_ea_get_i(ip, er);
	180	}
	181
	182	static int security_eo_set(struct gfs2_inode ip, struct gfs2_ea_request er)
	183	{
feaa7bba	184	struct inode *inode = &ip->i_inode;
639b6d79 RH	185	int error = permission(inode, MAY_WRITE, NULL);
	186	if (error)
	187	return error;
	188
	189	return gfs2_ea_set_i(ip, er);
	190	}
	191
	192	static int security_eo_remove(struct gfs2_inode ip, struct gfs2_ea_request er)
	193	{
feaa7bba	194	struct inode *inode = &ip->i_inode;
639b6d79 RH	195	int error = permission(inode, MAY_WRITE, NULL);
	196	if (error)
	197	return error;
	198
	199	return gfs2_ea_remove_i(ip, er);
	200	}
	201
08bc2dbc	202	static struct gfs2_eattr_operations gfs2_user_eaops = {
b3b94faa DT	203	.eo_get = user_eo_get,
	204	.eo_set = user_eo_set,
	205	.eo_remove = user_eo_remove,
	206	.eo_name = "user",
	207	};
	208
	209	struct gfs2_eattr_operations gfs2_system_eaops = {
	210	.eo_get = system_eo_get,
	211	.eo_set = system_eo_set,
	212	.eo_remove = system_eo_remove,
	213	.eo_name = "system",
	214	};
	215
43f5d210	216	static struct gfs2_eattr_operations gfs2_security_eaops = {
639b6d79 RH	217	.eo_get = security_eo_get,
	218	.eo_set = security_eo_set,
	219	.eo_remove = security_eo_remove,
	220	.eo_name = "security",
	221	};
	222
b3b94faa DT	223	struct gfs2_eattr_operations *gfs2_ea_ops[] = {
	224	NULL,
	225	&gfs2_user_eaops,
	226	&gfs2_system_eaops,
e70409f5	227	&gfs2_security_eaops,
b3b94faa DT	228	};
b3b94faa DT	229