static int
ext2_xattr_set_acl(struct _inode *inode, int type, const void *value,
size_t size)
{
struct posix_acl *acl;
int error;
if (!test_opt(i_get_sb(inode), POSIX_ACL))
return -EOPNOTSUPP;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {
error = posix_acl_valid(acl);
if (error)
goto release_and_out;
}
} else
acl = NULL;
error = ext2_set_acl(inode, type, acl);
release_and_out:
posix_acl_release(acl);
return error;
}
/*
* inode->i_mutex: don't care
*/
static struct posix_acl *
ext2_get_acl(const struct _inode *inode, int type)
{
struct ext2_inode_info *ei = EXT2_I(parent(inode));
int name_index;
char *value = NULL;
struct posix_acl *acl;
int retval;
if (!test_opt(i_get_sb(inode), POSIX_ACL))
return NULL;
switch(type) {
case ACL_TYPE_ACCESS:
acl = ext2_iget_acl(parent(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(parent(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);
kfree(value);
if (!IS_ERR(acl)) {
switch(type) {
case ACL_TYPE_ACCESS:
ext2_iset_acl(parent(inode), &ei->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext2_iset_acl(parent(inode), &ei->i_default_acl, acl);
break;
}
}
return acl;
}
/*
* Initialize the ACLs of a new inode. Called from ext2_new_inode.
*
* dir->i_mutex: down
* inode->i_mutex: up (access to inode is still exclusive)
*/
int
ext2_init_acl(struct _inode *inode, struct _inode *dir)
{
struct posix_acl *acl = NULL;
int error = 0;
if (!S_ISLNK(inode->i_mode)) {
if (test_opt(i_get_sb(dir), POSIX_ACL)) {
acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl))
return PTR_ERR(acl);
}
if (!acl)
inode->i_mode &= ~current->fs->umask;
}
if (test_opt(i_get_sb(inode), POSIX_ACL) && acl) {
struct posix_acl *clone;
mode_t mode;
if (S_ISDIR(inode->i_mode)) {
error = ext2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
if (error)
goto cleanup;
}
clone = posix_acl_clone(acl, GFP_KERNEL);
error = -ENOMEM;
if (!clone)
goto cleanup;
mode = inode->i_mode;
error = posix_acl_create_masq(clone, &mode);
if (error >= 0) {
inode->i_mode = mode;
if (error > 0) {
/* This is an extended ACL */
error = ext2_set_acl(inode,
ACL_TYPE_ACCESS, clone);
}
}
posix_acl_release(clone);
}
cleanup:
posix_acl_release(acl);
return error;
}
static int
ext2_xattr_user_get(struct _inode *inode, const char *name,
void *buffer, size_t size)
{
if (strcmp(name, "") == 0)
return -EINVAL;
if (!test_opt(i_get_sb(inode), XATTR_USER))
return -EOPNOTSUPP;
return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
}
static int
ext2_xattr_get_acl(struct _inode *inode, int type, void *buffer, size_t size)
{
struct posix_acl *acl;
int error;
if (!test_opt(i_get_sb(inode), POSIX_ACL))
return -EOPNOTSUPP;
acl = ext2_get_acl(inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
error = posix_acl_to_xattr(acl, buffer, size);
posix_acl_release(acl);
return error;
}
/*
* 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(parent(inode));
int name_index;
void *value = NULL;
size_t size = 0;
int error;
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (!test_opt(i_get_sb(inode), 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(parent(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(parent(inode), &ei->i_acl, acl);
break;
case ACL_TYPE_DEFAULT:
ext2_iset_acl(parent(inode), &ei->i_default_acl, acl);
break;
}
}
return error;
}
