/*
* inode->i_sem: don't care
*/
static struct posix_acl *
ext2_get_acl(struct inode *inode, int type)
{
struct ext2_inode_info *ei = EXT2_I(inode);
int name_index;
char *value = NULL;
struct posix_acl *acl;
int retval;
if (!test_opt(inode->i_sb, POSIX_ACL))
return 0;
switch(type) {
case ACL_TYPE_ACCESS:
acl = ext2_iget_acl(inode, &ei->i_acl);
if (acl != EXT2_ACL_NOT_CACHED)
return acl;
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
break;
case ACL_TYPE_DEFAULT:
acl = ext2_iget_acl(inode, &ei->i_default_acl);
if (acl != EXT2_ACL_NOT_CACHED)
return acl;
name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
break;
default:
return ERR_PTR(-EINVAL);
}
retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
if (retval > 0) {
value = kmalloc(retval, GFP_KERNEL);
if (!value)
return ERR_PTR(-ENOMEM);
retval = ext2_xattr_get(inode, name_index, "", value, retval);
}
if (retval > 0)
acl = ext2_acl_from_disk(value, retval);
else if (retval == -ENODATA || retval == -ENOSYS)
acl = NULL;
else
acl = ERR_PTR(retval);
if (value)
kfree(value);
if (!IS_ERR(acl)) {
switch(type) {
case ACL_TYPE_ACCESS:
ext2_iset_acl(inode, &ei->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext2_iset_acl(inode, &ei->i_default_acl, acl);
break;
}
}
return acl;
}
/*
* inode->i_mutex: down
*/
static int
ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
struct ext2_inode_info *ei = EXT2_I(inode);
int name_index;
void *value = NULL;
size_t size = 0;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (!test_opt(inode->i_sb, POSIX_ACL))
return 0;
switch(type) {
case ACL_TYPE_ACCESS:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
if (acl) {
mode_t mode = inode->i_mode;
error = posix_acl_equiv_mode(acl, &mode);
if (error < 0)
return error;
else {
inode->i_mode = mode;
mark_inode_dirty(inode);
if (error == 0)
acl = NULL;
}
}
break;
case ACL_TYPE_DEFAULT:
name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
if (!S_ISDIR(inode->i_mode))
return acl ? -EACCES : 0;
break;
default:
return -EINVAL;
}
if (acl) {
value = ext2_acl_to_disk(acl, &size);
if (IS_ERR(value))
return (int)PTR_ERR(value);
}
error = ext2_xattr_set(inode, name_index, "", value, size, 0);
kfree(value);
if (!error) {
switch(type) {
case ACL_TYPE_ACCESS:
ext2_iset_acl(inode, &ei->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext2_iset_acl(inode, &ei->i_default_acl, acl);
break;
}
}
return error;
}
