// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 */

#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/filelock.h>
#include <linux/posix_acl.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_dmap.h"
#include "jfs_txnmgr.h"
#include "jfs_xattr.h"
#include "jfs_acl.h"
#include "jfs_debug.h"

int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
        struct inode *inode = file->f_mapping->host;
        int rc = 0;

        rc = file_write_and_wait_range(file, start, end);
        if (rc)
                return rc;

        inode_lock(inode);
        if (!(inode_state_read_once(inode) & I_DIRTY_ALL) ||
            (datasync && !(inode_state_read_once(inode) & I_DIRTY_DATASYNC))) {
                /* Make sure committed changes hit the disk */
                jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
                inode_unlock(inode);
                return rc;
        }

        rc |= jfs_commit_inode(inode, 1);
        inode_unlock(inode);

        return rc ? -EIO : 0;
}

static int jfs_open(struct inode *inode, struct file *file)
{
        int rc;

        if (S_ISREG(inode->i_mode) && inode->i_size < 0)
                return -EIO;

        if ((rc = dquot_file_open(inode, file)))
                return rc;

        /*
         * We attempt to allow only one "active" file open per aggregate
         * group.  Otherwise, appending to files in parallel can cause
         * fragmentation within the files.
         *
         * If the file is empty, it was probably just created and going
         * to be written to.  If it has a size, we'll hold off until the
         * file is actually grown.
         */
        if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
            (inode->i_size == 0)) {
                struct jfs_inode_info *ji = JFS_IP(inode);
                spin_lock_irq(&ji->ag_lock);
                if (ji->active_ag == -1) {
                        struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
                        ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
                        atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
                }
                spin_unlock_irq(&ji->ag_lock);
        }

        return 0;
}
static int jfs_release(struct inode *inode, struct file *file)
{
        struct jfs_inode_info *ji = JFS_IP(inode);

        spin_lock_irq(&ji->ag_lock);
        if (ji->active_ag != -1) {
                struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
                atomic_dec(&bmap->db_active[ji->active_ag]);
                ji->active_ag = -1;
        }
        spin_unlock_irq(&ji->ag_lock);

        return 0;
}

int jfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
                struct iattr *iattr)
{
        struct inode *inode = d_inode(dentry);
        int rc;

        rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
        if (rc)
                return rc;

        if (is_quota_modification(&nop_mnt_idmap, inode, iattr)) {
                rc = dquot_initialize(inode);
                if (rc)
                        return rc;
        }
        if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
            (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
                rc = dquot_transfer(&nop_mnt_idmap, inode, iattr);
                if (rc)
                        return rc;
        }

        if ((iattr->ia_valid & ATTR_SIZE) &&
            iattr->ia_size != i_size_read(inode)) {
                inode_dio_wait(inode);

                rc = inode_newsize_ok(inode, iattr->ia_size);
                if (rc)
                        return rc;

                truncate_setsize(inode, iattr->ia_size);
                jfs_truncate(inode);
        }

        setattr_copy(&nop_mnt_idmap, inode, iattr);
        mark_inode_dirty(inode);

        if (iattr->ia_valid & ATTR_MODE)
                rc = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode);
        return rc;
}

const struct inode_operations jfs_file_inode_operations = {
        .listxattr      = jfs_listxattr,
        .setattr        = jfs_setattr,
        .fileattr_get   = jfs_fileattr_get,
        .fileattr_set   = jfs_fileattr_set,
#ifdef CONFIG_JFS_POSIX_ACL
        .get_inode_acl  = jfs_get_acl,
        .set_acl        = jfs_set_acl,
#endif
};

const struct file_operations jfs_file_operations = {
        .open           = jfs_open,
        .llseek         = generic_file_llseek,
        .read_iter      = generic_file_read_iter,
        .write_iter     = generic_file_write_iter,
        .mmap_prepare   = generic_file_mmap_prepare,
        .splice_read    = filemap_splice_read,
        .splice_write   = iter_file_splice_write,
        .fsync          = jfs_fsync,
        .release        = jfs_release,
        .unlocked_ioctl = jfs_ioctl,
        .compat_ioctl   = compat_ptr_ioctl,
        .setlease       = generic_setlease,
};