[linux-block.git] / fs / hfsplus / posix_acl.c

// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/hfsplus/posix_acl.c
 *
 * Vyacheslav Dubeyko <slava@dubeyko.com>
 *
 * Handler for Posix Access Control Lists (ACLs) support.
 */

#include "hfsplus_fs.h"
#include "xattr.h"
#include "acl.h"

struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
{
	struct posix_acl *acl;
	char *xattr_name;
	char *value = NULL;
	ssize_t size;

	hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);

	switch (type) {
	case ACL_TYPE_ACCESS:
		xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		return ERR_PTR(-EINVAL);
	}

	size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);

	if (size > 0) {
		value = (char *)hfsplus_alloc_attr_entry();
		if (unlikely(!value))
			return ERR_PTR(-ENOMEM);
		size = __hfsplus_getxattr(inode, xattr_name, value, size);
	}

	if (size > 0)
		acl = posix_acl_from_xattr(&init_user_ns, value, size);
	else if (size == -ENODATA)
		acl = NULL;
	else
		acl = ERR_PTR(size);

	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);

	return acl;
}

static int __hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
				   int type)
{
	int err;
	char *xattr_name;
	size_t size = 0;
	char *value = NULL;

	hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);

	switch (type) {
	case ACL_TYPE_ACCESS:
		xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;

	case ACL_TYPE_DEFAULT:
		xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;

	default:
		return -EINVAL;
	}

	if (acl) {
		size = posix_acl_xattr_size(acl->a_count);
		if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
			return -ENOMEM;
		value = (char *)hfsplus_alloc_attr_entry();
		if (unlikely(!value))
			return -ENOMEM;
		err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
		if (unlikely(err < 0))
			goto end_set_acl;
	}

	err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);

end_set_acl:
	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);

	if (!err)
		set_cached_acl(inode, type, acl);

	return err;
}

int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	int err;

	if (type == ACL_TYPE_ACCESS && acl) {
		err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
		if (err)
			return err;
	}
	return __hfsplus_set_posix_acl(inode, acl, type);
}

int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
{
	int err = 0;
	struct posix_acl *default_acl, *acl;

	hfs_dbg(ACL_MOD,
		"[%s]: ino %lu, dir->ino %lu\n",
		__func__, inode->i_ino, dir->i_ino);

	if (S_ISLNK(inode->i_mode))
		return 0;

	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	if (err)
		return err;

	if (default_acl) {
		err = __hfsplus_set_posix_acl(inode, default_acl,
					      ACL_TYPE_DEFAULT);
		posix_acl_release(default_acl);
	}

	if (acl) {
		if (!err)
			err = __hfsplus_set_posix_acl(inode, acl,
						      ACL_TYPE_ACCESS);
		posix_acl_release(acl);
	}
	return err;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
eef80d4a VD	2	/*
	3	* linux/fs/hfsplus/posix_acl.c
	4	*
	5	* Vyacheslav Dubeyko <slava@dubeyko.com>
	6	*
	7	* Handler for Posix Access Control Lists (ACLs) support.
	8	*/
	9
	10	#include "hfsplus_fs.h"
	11	#include "xattr.h"
	12	#include "acl.h"
	13
	14	struct posix_acl hfsplus_get_posix_acl(struct inode inode, int type)
	15	{
	16	struct posix_acl *acl;
	17	char *xattr_name;
	18	char *value = NULL;
	19	ssize_t size;
	20
b0a7ab57	21	hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
eef80d4a VD	22
	23	switch (type) {
	24	case ACL_TYPE_ACCESS:
97d79299	25	xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
eef80d4a VD	26	break;
eef80d4a VD	27	case ACL_TYPE_DEFAULT:
97d79299	28	xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
eef80d4a VD	29	break;
	30	default:
	31	return ERR_PTR(-EINVAL);
	32	}
	33
	34	size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
	35
	36	if (size > 0) {
	37	value = (char *)hfsplus_alloc_attr_entry();
	38	if (unlikely(!value))
	39	return ERR_PTR(-ENOMEM);
	40	size = __hfsplus_getxattr(inode, xattr_name, value, size);
	41	}
	42
	43	if (size > 0)
	44	acl = posix_acl_from_xattr(&init_user_ns, value, size);
	45	else if (size == -ENODATA)
	46	acl = NULL;
	47	else
	48	acl = ERR_PTR(size);
	49
	50	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
	51
eef80d4a VD	52	return acl;
	53	}
	54
84969465 JK	55	static int __hfsplus_set_posix_acl(struct inode inode, struct posix_acl acl,
84969465 JK	56	int type)
eef80d4a VD	57	{
	58	int err;
	59	char *xattr_name;
	60	size_t size = 0;
	61	char *value = NULL;
	62
b0a7ab57	63	hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
eef80d4a VD	64
	65	switch (type) {
	66	case ACL_TYPE_ACCESS:
97d79299	67	xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;
eef80d4a VD	68	break;
	69
	70	case ACL_TYPE_DEFAULT:
97d79299	71	xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;
eef80d4a VD	72	if (!S_ISDIR(inode->i_mode))
	73	return acl ? -EACCES : 0;
	74	break;
	75
	76	default:
	77	return -EINVAL;
	78	}
	79
	80	if (acl) {
	81	size = posix_acl_xattr_size(acl->a_count);
	82	if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
	83	return -ENOMEM;
	84	value = (char *)hfsplus_alloc_attr_entry();
	85	if (unlikely(!value))
	86	return -ENOMEM;
	87	err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
	88	if (unlikely(err < 0))
	89	goto end_set_acl;
	90	}
	91
	92	err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
	93
	94	end_set_acl:
	95	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
	96
	97	if (!err)
	98	set_cached_acl(inode, type, acl);
	99
	100	return err;
	101	}
	102
84969465 JK	103	int hfsplus_set_posix_acl(struct inode inode, struct posix_acl acl, int type)
	104	{
	105	int err;
	106
	107	if (type == ACL_TYPE_ACCESS && acl) {
	108	err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
	109	if (err)
	110	return err;
	111	}
	112	return __hfsplus_set_posix_acl(inode, acl, type);
	113	}
	114
eef80d4a VD	115	int hfsplus_init_posix_acl(struct inode inode, struct inode dir)
	116	{
	117	int err = 0;
b0a7ab57	118	struct posix_acl default_acl, acl;
eef80d4a VD	119
	120	hfs_dbg(ACL_MOD,
	121	"[%s]: ino %lu, dir->ino %lu\n",
	122	__func__, inode->i_ino, dir->i_ino);
	123
	124	if (S_ISLNK(inode->i_mode))
	125	return 0;
	126
b0a7ab57 CH	127	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
b0a7ab57 CH	128	if (err)
eef80d4a VD	129	return err;
eef80d4a VD	130
b0a7ab57	131	if (default_acl) {
84969465 JK	132	err = __hfsplus_set_posix_acl(inode, default_acl,
84969465 JK	133	ACL_TYPE_DEFAULT);
b0a7ab57	134	posix_acl_release(default_acl);
eef80d4a VD	135	}
eef80d4a VD	136
b0a7ab57 CH	137	if (acl) {
b0a7ab57 CH	138	if (!err)
84969465 JK	139	err = __hfsplus_set_posix_acl(inode, acl,
84969465 JK	140	ACL_TYPE_ACCESS);
b0a7ab57 CH	141	posix_acl_release(acl);
b0a7ab57 CH	142	}
eef80d4a VD	143	return err;
eef80d4a VD	144	}