Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu /fs/hfsplus/posix_acl.c
Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
/*
 * 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 = POSIX_ACL_XATTR_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		xattr_name = POSIX_ACL_XATTR_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);

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

	return acl;
}

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 = POSIX_ACL_XATTR_ACCESS;
		if (acl) {
			err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
			if (err)
				return err;
		}
		err = 0;
		break;

	case ACL_TYPE_DEFAULT:
		xattr_name = POSIX_ACL_XATTR_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_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;
}