// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) International Business Machines  Corp., 2002-2004
 *   Copyright (C) Andreas Gruenbacher, 2001
 *   Copyright (C) Linus Torvalds, 1991, 1992
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include "jfs_incore.h"
#include "jfs_txnmgr.h"
#include "jfs_xattr.h"
#include "jfs_acl.h"

struct posix_acl *jfs_get_acl(struct inode *inode, int type, bool rcu)
{
        struct posix_acl *acl;
        char *ea_name;
        int size;
        char *value = NULL;

        if (rcu)
                return ERR_PTR(-ECHILD);

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

        size = __jfs_getxattr(inode, ea_name, NULL, 0);

        if (size > 0) {
                value = kmalloc(size, GFP_KERNEL);
                if (!value)
                        return ERR_PTR(-ENOMEM);
                size = __jfs_getxattr(inode, ea_name, value, size);
        }

        if (size < 0) {
                if (size == -ENODATA)
                        acl = NULL;
                else
                        acl = ERR_PTR(size);
        } else {
                acl = posix_acl_from_xattr(&init_user_ns, value, size);
        }
        kfree(value);
        return acl;
}

static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
                       struct posix_acl *acl)
{
        char *ea_name;
        int rc;
        size_t size = 0;
        char *value = NULL;

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

        if (acl) {
                value = posix_acl_to_xattr(&init_user_ns, acl, &size, GFP_KERNEL);
                if (!value)
                        return -ENOMEM;
        }
        rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
        kfree(value);

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

        return rc;
}

int jfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
                struct posix_acl *acl, int type)
{
        int rc;
        tid_t tid;
        int update_mode = 0;
        struct inode *inode = d_inode(dentry);
        umode_t mode = inode->i_mode;

        tid = txBegin(inode->i_sb, 0);
        mutex_lock(&JFS_IP(inode)->commit_mutex);
        if (type == ACL_TYPE_ACCESS && acl) {
                rc = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, &acl);
                if (rc)
                        goto end_tx;
                if (mode != inode->i_mode)
                        update_mode = 1;
        }
        rc = __jfs_set_acl(tid, inode, type, acl);
        if (!rc) {
                if (update_mode) {
                        inode->i_mode = mode;
                        inode_set_ctime_current(inode);
                        mark_inode_dirty(inode);
                }
                rc = txCommit(tid, 1, &inode, 0);
        }
end_tx:
        txEnd(tid);
        mutex_unlock(&JFS_IP(inode)->commit_mutex);
        return rc;
}

int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
{
        struct posix_acl *default_acl, *acl;
        int rc = 0;

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

        if (default_acl) {
                rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
                posix_acl_release(default_acl);
        } else {
                inode->i_default_acl = NULL;
        }

        if (acl) {
                if (!rc)
                        rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
                posix_acl_release(acl);
        } else {
                inode->i_acl = NULL;
        }

        JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
                               inode->i_mode;

        return rc;
}