[mirror_ubuntu-artful-kernel.git] / fs / hfsplus / posix_acl.c

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