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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* inode.cc — Inode allocation, lifecycle, and generic helpers
*/
#include <lume/fs.h>
#include <lume/dcache.h>
#include <lume/slab.h>
#include <lume/errno.h>
namespace {
lume::atomic<uint64> g_next_ino{1};
} // namespace
/* ================================================================== */
/* new_inode — allocate a fresh inode on a superblock */
/* ================================================================== */
inode* new_inode(super_block* sb)
{
inode* ip = nullptr;
if (sb->s_op && sb->s_op->alloc_inode)
ip = sb->s_op->alloc_inode(sb);
else
ip = new inode{};
if (!ip) return nullptr;
/* Zero-init key fields */
ip->i_sb = sb;
ip->i_ino = g_next_ino.fetch_add(1);
ip->i_mode = 0;
ip->i_flags = 0;
ip->i_uid = 0;
ip->i_gid = 0;
ip->i_nlink = 1;
ip->i_rdev = 0;
ip->i_size = 0;
ip->i_blocks = 0;
ip->i_bytes = 0;
ip->i_blkbits = sb->s_blocksize_bits;
ip->i_generation = 0;
ip->i_state = I_NEW;
ip->i_count.store(1);
ip->i_writecount.store(0);
ip->i_atime_sec = ip->i_mtime_sec = ip->i_ctime_sec = 0;
ip->i_atime_nsec = ip->i_mtime_nsec = ip->i_ctime_nsec = 0;
ip->i_op = nullptr;
ip->i_fop = nullptr;
ip->i_mapping = &ip->i_data;
ip->i_private = nullptr;
ip->i_pipe = nullptr;
/* Init embedded address_space */
ip->i_data.host = ip;
ip->i_data.a_ops = nullptr;
ip->i_data.nrpages = 0;
ip->i_data.flags = 0;
/* Init lists */
list_init(&ip->i_sb_list);
list_init(&ip->i_dentry);
/* Add to superblock's inode list */
{
LockGuard guard(sb->s_inode_list_lock);
list_add_tail(&ip->i_sb_list, &sb->s_inodes);
}
return ip;
}
/* ================================================================== */
/* ihold / iput — reference counting */
/* ================================================================== */
void ihold(inode* ip)
{
ip->i_count.fetch_add(1);
}
void iput(inode* ip)
{
if (!ip) return;
int old = ip->i_count.fetch_sub(1);
if (old > 1) return;
/* Last reference dropped — evict */
if (ip->i_sb->s_op && ip->i_sb->s_op->evict_inode)
ip->i_sb->s_op->evict_inode(ip);
/* Remove from sb list */
{
LockGuard guard(ip->i_sb->s_inode_list_lock);
list_del(&ip->i_sb_list);
}
if (ip->i_sb->s_op && ip->i_sb->s_op->destroy_inode)
ip->i_sb->s_op->destroy_inode(ip);
else
delete ip;
}
/* ================================================================== */
/* nlink helpers */
/* ================================================================== */
void set_nlink(inode* ip, uint32 nlink) { ip->i_nlink = nlink; }
void inc_nlink(inode* ip) { ip->i_nlink++; }
void drop_nlink(inode* ip) { ip->i_nlink--; }
void clear_nlink(inode* ip) { ip->i_nlink = 0; }
/* ================================================================== */
/* inode_init_owner */
/* ================================================================== */
void inode_init_owner(inode* ip, const inode* dir, uint32 mode)
{
ip->i_uid = 0; /* Phase 1: always root */
ip->i_gid = 0;
ip->i_mode = mode;
}
/* ================================================================== */
/* generic_fillattr — fill kstat from inode (used by getattr) */
/* ================================================================== */
void generic_fillattr(inode* ip, kstat* stat)
{
stat->st_dev = ip->i_sb->s_dev;
stat->st_ino = ip->i_ino;
stat->st_mode = ip->i_mode;
stat->st_nlink = ip->i_nlink;
stat->st_uid = ip->i_uid;
stat->st_gid = ip->i_gid;
stat->st_rdev = ip->i_rdev;
stat->__pad = 0;
stat->st_size = ip->i_size;
stat->st_blksize = 1 << ip->i_blkbits;
stat->__pad2 = 0;
stat->st_blocks = ip->i_blocks;
stat->st_atime_sec = ip->i_atime_sec;
stat->st_atime_nsec = ip->i_atime_nsec;
stat->st_mtime_sec = ip->i_mtime_sec;
stat->st_mtime_nsec = ip->i_mtime_nsec;
stat->st_ctime_sec = ip->i_ctime_sec;
stat->st_ctime_nsec = ip->i_ctime_nsec;
stat->__unused[0] = 0;
stat->__unused[1] = 0;
}
/* ================================================================== */
/* mark_inode_dirty (stub) */
/* ================================================================== */
void mark_inode_dirty(inode* ip)
{
ip->i_state |= I_DIRTY_SYNC;
/* Phase 1: no writeback, ramfs is memory-only */
}
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