From e097935e606d2e39ba1bd1f931c95e7fbbd86969 Mon Sep 17 00:00:00 2001
From: g2px1 <g2px1@velx.top>
Date: Fri, 20 Jun 2025 20:27:15 +0000
Subject: [PATCH] 3

---
 .gitignore |   3 +-
 .libfs.o.d | 252 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 init.bash  |   4 +
 libfs.c    | 182 +++++++++++++++++++++++++++++++++++---
 4 files changed, 426 insertions(+), 15 deletions(-)
 create mode 100644 .libfs.o.d
 create mode 100755 init.bash

diff --git a/.gitignore b/.gitignore
index 9f65fff..def033f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,9 +4,10 @@
 *.mod.c
 *.mod.o
 *.o
+*.log
 CMakeLists.txt
 Module.symvers
 modules.order
 .idea
 cmake-build-debug
-build
\ No newline at end of file
+build
diff --git a/.libfs.o.d b/.libfs.o.d
new file mode 100644
index 0000000..ffcfc4f
--- /dev/null
+++ b/.libfs.o.d
@@ -0,0 +1,252 @@
+libfs.o: /home/ubuntu/FS/libfs.c include/linux/compiler-version.h \
+ include/linux/kconfig.h include/generated/autoconf.h \
+ include/linux/compiler_types.h include/linux/compiler_attributes.h \
+ include/linux/compiler-gcc.h include/linux/module.h include/linux/list.h \
+ include/linux/types.h include/uapi/linux/types.h \
+ arch/x86/include/generated/uapi/asm/types.h \
+ include/uapi/asm-generic/types.h include/asm-generic/int-ll64.h \
+ include/uapi/asm-generic/int-ll64.h \
+ arch/x86/include/uapi/asm/bitsperlong.h \
+ include/asm-generic/bitsperlong.h include/uapi/asm-generic/bitsperlong.h \
+ include/uapi/linux/posix_types.h include/linux/stddef.h \
+ include/uapi/linux/stddef.h include/linux/compiler_types.h \
+ arch/x86/include/asm/posix_types.h \
+ arch/x86/include/uapi/asm/posix_types_64.h \
+ include/uapi/asm-generic/posix_types.h include/linux/poison.h \
+ include/linux/const.h include/vdso/const.h include/uapi/linux/const.h \
+ include/linux/kernel.h include/linux/stdarg.h include/linux/align.h \
+ include/linux/limits.h include/uapi/linux/limits.h include/vdso/limits.h \
+ include/linux/linkage.h include/linux/stringify.h include/linux/export.h \
+ include/linux/compiler.h arch/x86/include/generated/asm/rwonce.h \
+ include/asm-generic/rwonce.h include/linux/kasan-checks.h \
+ include/linux/kcsan-checks.h arch/x86/include/asm/linkage.h \
+ include/linux/bitops.h include/linux/bits.h include/vdso/bits.h \
+ include/linux/build_bug.h include/linux/typecheck.h \
+ include/uapi/linux/kernel.h include/uapi/linux/sysinfo.h \
+ arch/x86/include/asm/bitops.h arch/x86/include/asm/alternative.h \
+ arch/x86/include/asm/asm.h arch/x86/include/asm/extable_fixup_types.h \
+ arch/x86/include/asm/rmwcc.h arch/x86/include/asm/barrier.h \
+ arch/x86/include/asm/nops.h include/asm-generic/barrier.h \
+ include/asm-generic/bitops/find.h include/asm-generic/bitops/sched.h \
+ arch/x86/include/asm/arch_hweight.h arch/x86/include/asm/cpufeatures.h \
+ arch/x86/include/asm/required-features.h \
+ arch/x86/include/asm/disabled-features.h \
+ include/asm-generic/bitops/const_hweight.h \
+ include/asm-generic/bitops/instrumented-atomic.h \
+ include/linux/instrumented.h \
+ include/asm-generic/bitops/instrumented-non-atomic.h \
+ include/asm-generic/bitops/instrumented-lock.h \
+ include/asm-generic/bitops/le.h arch/x86/include/uapi/asm/byteorder.h \
+ include/linux/byteorder/little_endian.h \
+ include/uapi/linux/byteorder/little_endian.h include/linux/swab.h \
+ include/uapi/linux/swab.h arch/x86/include/uapi/asm/swab.h \
+ include/linux/byteorder/generic.h \
+ include/asm-generic/bitops/ext2-atomic-setbit.h include/linux/kstrtox.h \
+ include/linux/log2.h include/linux/math.h arch/x86/include/asm/div64.h \
+ include/asm-generic/div64.h include/linux/minmax.h include/linux/panic.h \
+ include/linux/printk.h include/linux/init.h include/linux/kern_levels.h \
+ include/linux/cache.h arch/x86/include/asm/cache.h \
+ include/linux/ratelimit_types.h include/uapi/linux/param.h \
+ arch/x86/include/generated/uapi/asm/param.h include/asm-generic/param.h \
+ include/uapi/asm-generic/param.h include/linux/spinlock_types.h \
+ include/linux/spinlock_types_raw.h arch/x86/include/asm/spinlock_types.h \
+ include/asm-generic/qspinlock_types.h \
+ include/asm-generic/qrwlock_types.h include/linux/lockdep_types.h \
+ include/linux/rwlock_types.h include/linux/once_lite.h \
+ include/linux/dynamic_debug.h include/linux/jump_label.h \
+ arch/x86/include/asm/jump_label.h include/linux/static_call_types.h \
+ include/linux/stat.h arch/x86/include/uapi/asm/stat.h \
+ include/uapi/linux/stat.h include/linux/time.h include/linux/math64.h \
+ include/vdso/math64.h include/linux/time64.h include/vdso/time64.h \
+ include/uapi/linux/time.h include/uapi/linux/time_types.h \
+ include/linux/time32.h include/linux/timex.h include/uapi/linux/timex.h \
+ arch/x86/include/asm/timex.h arch/x86/include/asm/processor.h \
+ arch/x86/include/asm/processor-flags.h \
+ arch/x86/include/uapi/asm/processor-flags.h include/linux/mem_encrypt.h \
+ arch/x86/include/asm/mem_encrypt.h include/linux/cc_platform.h \
+ arch/x86/include/uapi/asm/bootparam.h include/linux/screen_info.h \
+ include/uapi/linux/screen_info.h include/linux/apm_bios.h \
+ include/uapi/linux/apm_bios.h include/uapi/linux/ioctl.h \
+ arch/x86/include/generated/uapi/asm/ioctl.h include/asm-generic/ioctl.h \
+ include/uapi/asm-generic/ioctl.h include/linux/edd.h \
+ include/uapi/linux/edd.h arch/x86/include/asm/ist.h \
+ arch/x86/include/uapi/asm/ist.h include/video/edid.h \
+ include/uapi/video/edid.h arch/x86/include/asm/math_emu.h \
+ arch/x86/include/asm/ptrace.h arch/x86/include/asm/segment.h \
+ arch/x86/include/asm/page_types.h arch/x86/include/asm/page_64_types.h \
+ arch/x86/include/asm/kaslr.h arch/x86/include/uapi/asm/ptrace.h \
+ arch/x86/include/uapi/asm/ptrace-abi.h \
+ arch/x86/include/asm/paravirt_types.h arch/x86/include/asm/desc_defs.h \
+ arch/x86/include/asm/pgtable_types.h \
+ arch/x86/include/asm/pgtable_64_types.h arch/x86/include/asm/sparsemem.h \
+ arch/x86/include/asm/nospec-branch.h include/linux/static_key.h \
+ include/linux/objtool.h arch/x86/include/asm/msr-index.h \
+ arch/x86/include/asm/unwind_hints.h arch/x86/include/asm/orc_types.h \
+ arch/x86/include/asm/percpu.h include/asm-generic/percpu.h \
+ include/linux/threads.h include/linux/percpu-defs.h \
+ arch/x86/include/asm/GEN-for-each-reg.h arch/x86/include/asm/proto.h \
+ arch/x86/include/uapi/asm/ldt.h arch/x86/include/uapi/asm/sigcontext.h \
+ arch/x86/include/asm/current.h arch/x86/include/asm/page.h \
+ arch/x86/include/asm/page_64.h include/linux/range.h \
+ include/asm-generic/memory_model.h include/linux/pfn.h \
+ include/asm-generic/getorder.h arch/x86/include/asm/msr.h \
+ arch/x86/include/asm/msr-index.h \
+ arch/x86/include/generated/uapi/asm/errno.h \
+ include/uapi/asm-generic/errno.h include/uapi/asm-generic/errno-base.h \
+ arch/x86/include/asm/cpumask.h include/linux/cpumask.h \
+ include/linux/bitmap.h include/linux/string.h include/linux/err.h \
+ include/linux/errno.h include/uapi/linux/errno.h \
+ include/linux/overflow.h include/uapi/linux/string.h \
+ arch/x86/include/asm/string.h arch/x86/include/asm/string_64.h \
+ include/linux/fortify-string.h include/linux/atomic.h \
+ arch/x86/include/asm/atomic.h arch/x86/include/asm/cmpxchg.h \
+ arch/x86/include/asm/cmpxchg_64.h arch/x86/include/asm/atomic64_64.h \
+ include/linux/atomic/atomic-arch-fallback.h \
+ include/linux/atomic/atomic-long.h \
+ include/linux/atomic/atomic-instrumented.h include/linux/bug.h \
+ arch/x86/include/asm/bug.h include/linux/instrumentation.h \
+ include/asm-generic/bug.h arch/x86/include/uapi/asm/msr.h \
+ include/linux/tracepoint-defs.h arch/x86/include/asm/paravirt.h \
+ arch/x86/include/asm/frame.h arch/x86/include/asm/special_insns.h \
+ include/linux/irqflags.h arch/x86/include/asm/irqflags.h \
+ arch/x86/include/asm/fpu/types.h arch/x86/include/asm/vmxfeatures.h \
+ arch/x86/include/asm/vdso/processor.h include/linux/personality.h \
+ include/uapi/linux/personality.h arch/x86/include/asm/tsc.h \
+ arch/x86/include/asm/cpufeature.h include/vdso/time32.h \
+ include/vdso/time.h include/linux/uidgid.h include/linux/highuid.h \
+ include/linux/buildid.h include/linux/mm_types.h \
+ include/linux/mm_types_task.h arch/x86/include/asm/tlbbatch.h \
+ include/linux/auxvec.h include/uapi/linux/auxvec.h \
+ arch/x86/include/uapi/asm/auxvec.h include/linux/spinlock.h \
+ include/linux/preempt.h arch/x86/include/asm/preempt.h \
+ include/linux/thread_info.h include/linux/restart_block.h \
+ arch/x86/include/asm/thread_info.h include/linux/bottom_half.h \
+ include/linux/lockdep.h include/linux/smp.h include/linux/smp_types.h \
+ include/linux/llist.h arch/x86/include/asm/smp.h \
+ arch/x86/include/generated/asm/mmiowb.h include/asm-generic/mmiowb.h \
+ arch/x86/include/asm/spinlock.h arch/x86/include/asm/qspinlock.h \
+ include/asm-generic/qspinlock.h arch/x86/include/asm/qrwlock.h \
+ include/asm-generic/qrwlock.h include/linux/rwlock.h \
+ include/linux/spinlock_api_smp.h include/linux/rwlock_api_smp.h \
+ include/linux/rbtree.h include/linux/rbtree_types.h \
+ include/linux/rcupdate.h include/linux/rcutree.h include/linux/rwsem.h \
+ include/linux/osq_lock.h include/linux/completion.h \
+ include/linux/swait.h include/linux/wait.h include/uapi/linux/wait.h \
+ include/linux/uprobes.h arch/x86/include/asm/uprobes.h \
+ include/linux/notifier.h include/linux/mutex.h \
+ include/linux/debug_locks.h include/linux/srcu.h \
+ include/linux/workqueue.h include/linux/timer.h include/linux/ktime.h \
+ include/linux/jiffies.h include/vdso/jiffies.h \
+ include/generated/timeconst.h include/vdso/ktime.h \
+ include/linux/timekeeping.h include/linux/clocksource_ids.h \
+ include/linux/debugobjects.h include/linux/rcu_segcblist.h \
+ include/linux/srcutree.h include/linux/rcu_node_tree.h \
+ include/linux/page-flags-layout.h include/linux/numa.h \
+ include/generated/bounds.h include/linux/seqlock.h \
+ include/linux/ww_mutex.h include/linux/rtmutex.h \
+ arch/x86/include/asm/mmu.h include/linux/kmod.h include/linux/umh.h \
+ include/linux/gfp.h include/linux/mmdebug.h include/linux/mmzone.h \
+ include/linux/nodemask.h include/linux/pageblock-flags.h \
+ include/linux/page-flags.h include/linux/local_lock.h \
+ include/linux/local_lock_internal.h include/linux/memory_hotplug.h \
+ arch/x86/include/asm/mmzone.h arch/x86/include/asm/mmzone_64.h \
+ include/linux/topology.h include/linux/arch_topology.h \
+ include/linux/percpu.h arch/x86/include/asm/topology.h \
+ arch/x86/include/asm/mpspec.h arch/x86/include/asm/mpspec_def.h \
+ arch/x86/include/asm/x86_init.h arch/x86/include/asm/apicdef.h \
+ include/asm-generic/topology.h include/linux/sysctl.h \
+ include/uapi/linux/sysctl.h include/linux/elf.h \
+ arch/x86/include/asm/elf.h arch/x86/include/asm/user.h \
+ arch/x86/include/asm/user_64.h arch/x86/include/asm/fsgsbase.h \
+ arch/x86/include/asm/vdso.h include/uapi/linux/elf.h \
+ include/uapi/linux/elf-em.h include/linux/kobject.h \
+ include/linux/sysfs.h include/linux/kernfs.h include/linux/idr.h \
+ include/linux/radix-tree.h include/linux/xarray.h \
+ include/linux/kconfig.h include/linux/kobject_ns.h include/linux/kref.h \
+ include/linux/refcount.h include/linux/moduleparam.h \
+ include/linux/rbtree_latch.h include/linux/error-injection.h \
+ include/asm-generic/error-injection.h include/linux/cfi.h \
+ arch/x86/include/asm/module.h include/asm-generic/module.h \
+ arch/x86/include/asm/orc_types.h include/linux/fs.h \
+ include/linux/wait_bit.h include/linux/kdev_t.h \
+ include/uapi/linux/kdev_t.h include/linux/dcache.h \
+ include/linux/rculist.h include/linux/rculist_bl.h \
+ include/linux/list_bl.h include/linux/bit_spinlock.h \
+ include/linux/lockref.h include/linux/stringhash.h include/linux/hash.h \
+ include/linux/path.h include/linux/list_lru.h include/linux/shrinker.h \
+ include/linux/pid.h include/linux/capability.h \
+ include/uapi/linux/capability.h include/linux/semaphore.h \
+ include/linux/fcntl.h include/uapi/linux/fcntl.h \
+ arch/x86/include/generated/uapi/asm/fcntl.h \
+ include/uapi/asm-generic/fcntl.h include/uapi/linux/openat2.h \
+ include/linux/migrate_mode.h include/linux/percpu-rwsem.h \
+ include/linux/rcuwait.h include/linux/sched/signal.h \
+ include/linux/signal.h include/linux/signal_types.h \
+ include/uapi/linux/signal.h arch/x86/include/asm/signal.h \
+ arch/x86/include/uapi/asm/signal.h \
+ include/uapi/asm-generic/signal-defs.h \
+ arch/x86/include/uapi/asm/siginfo.h include/uapi/asm-generic/siginfo.h \
+ include/linux/sched.h include/uapi/linux/sched.h include/linux/sem.h \
+ include/uapi/linux/sem.h include/linux/ipc.h \
+ include/linux/rhashtable-types.h include/uapi/linux/ipc.h \
+ arch/x86/include/generated/uapi/asm/ipcbuf.h \
+ include/uapi/asm-generic/ipcbuf.h arch/x86/include/uapi/asm/sembuf.h \
+ include/linux/shm.h include/uapi/linux/shm.h \
+ include/uapi/asm-generic/hugetlb_encode.h \
+ arch/x86/include/uapi/asm/shmbuf.h include/uapi/asm-generic/shmbuf.h \
+ arch/x86/include/asm/shmparam.h include/linux/plist.h \
+ include/linux/hrtimer.h include/linux/hrtimer_defs.h \
+ include/linux/timerqueue.h include/linux/seccomp.h \
+ include/uapi/linux/seccomp.h arch/x86/include/asm/seccomp.h \
+ arch/x86/include/asm/unistd.h arch/x86/include/uapi/asm/unistd.h \
+ arch/x86/include/generated/uapi/asm/unistd_64.h \
+ arch/x86/include/generated/asm/unistd_64_x32.h \
+ arch/x86/include/generated/asm/unistd_32_ia32.h \
+ arch/x86/include/asm/ia32_unistd.h include/asm-generic/seccomp.h \
+ include/uapi/linux/unistd.h include/linux/resource.h \
+ include/uapi/linux/resource.h \
+ arch/x86/include/generated/uapi/asm/resource.h \
+ include/asm-generic/resource.h include/uapi/asm-generic/resource.h \
+ include/linux/latencytop.h include/linux/sched/prio.h \
+ include/linux/sched/types.h include/linux/syscall_user_dispatch.h \
+ include/linux/task_io_accounting.h include/linux/posix-timers.h \
+ include/linux/alarmtimer.h include/linux/task_work.h \
+ include/uapi/linux/rseq.h include/linux/kcsan.h \
+ arch/x86/include/generated/asm/kmap_size.h \
+ include/asm-generic/kmap_size.h include/linux/sched/jobctl.h \
+ include/linux/sched/task.h include/linux/uaccess.h \
+ include/linux/fault-inject-usercopy.h arch/x86/include/asm/uaccess.h \
+ arch/x86/include/asm/smap.h arch/x86/include/asm/extable.h \
+ arch/x86/include/asm/uaccess_64.h include/linux/cred.h \
+ include/linux/key.h include/linux/assoc_array.h \
+ include/linux/sched/user.h include/linux/percpu_counter.h \
+ include/linux/ratelimit.h include/linux/rcu_sync.h \
+ include/linux/delayed_call.h include/linux/uuid.h \
+ include/uapi/linux/uuid.h include/linux/errseq.h include/linux/ioprio.h \
+ include/linux/sched/rt.h include/linux/iocontext.h \
+ include/uapi/linux/ioprio.h include/linux/fs_types.h \
+ include/linux/mount.h include/linux/mnt_idmapping.h \
+ include/uapi/linux/fs.h include/linux/quota.h \
+ include/uapi/linux/dqblk_xfs.h include/linux/dqblk_v1.h \
+ include/linux/dqblk_v2.h include/linux/dqblk_qtree.h \
+ include/linux/projid.h include/uapi/linux/quota.h \
+ include/linux/nfs_fs_i.h include/linux/pagemap.h include/linux/mm.h \
+ include/linux/mmap_lock.h include/linux/percpu-refcount.h \
+ include/linux/page_ext.h include/linux/stacktrace.h \
+ include/linux/stackdepot.h include/linux/page_ref.h \
+ include/linux/memremap.h include/linux/ioport.h include/linux/sizes.h \
+ include/linux/pgtable.h arch/x86/include/asm/pgtable.h \
+ arch/x86/include/asm/pkru.h arch/x86/include/asm/fpu/api.h \
+ include/asm-generic/pgtable_uffd.h arch/x86/include/asm/pgtable_64.h \
+ arch/x86/include/asm/fixmap.h arch/x86/include/uapi/asm/vsyscall.h \
+ include/asm-generic/fixmap.h arch/x86/include/asm/pgtable-invert.h \
+ include/linux/kasan.h include/linux/huge_mm.h \
+ include/linux/sched/coredump.h include/linux/vmstat.h \
+ include/linux/vm_event_item.h include/linux/highmem.h \
+ include/linux/hardirq.h include/linux/context_tracking_state.h \
+ include/linux/ftrace_irq.h include/linux/vtime.h \
+ arch/x86/include/asm/hardirq.h arch/x86/include/asm/cacheflush.h \
+ include/asm-generic/cacheflush.h include/linux/highmem-internal.h \
+ include/linux/hugetlb_inline.h include/linux/namei.h \
+ include/linux/slab.h include/linux/hashtable.h \
+ include/generated/uapi/linux/version.h
diff --git a/init.bash b/init.bash
new file mode 100755
index 0000000..0d78cfc
--- /dev/null
+++ b/init.bash
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+sudo touch /home/ubuntu/FS/customfs.log
+sudo chmod 666 /home/ubuntu/FS/customfs.log
diff --git a/libfs.c b/libfs.c
index 1524cc7..0167c77 100644
--- a/libfs.c
+++ b/libfs.c
@@ -14,6 +14,18 @@
 #define MODE_BOOKS 01777
 #define MODE_AUTHORS 0777
 #define MODE_AUTHOR_SUBDIR 01777
+#define logf(fmt, ...)                                 \
+    do {                                               \
+        printk(KERN_INFO "customfs: " fmt "\n", ##__VA_ARGS__); \
+        struct file *f = filp_open("/home/ubuntu/FS/customfs.log", O_WRONLY | O_CREAT | O_APPEND, 0644); \
+        if (!IS_ERR(f)) {                              \
+            char __buf[256];                           \
+            int __len = snprintf(__buf, sizeof(__buf), fmt "\n", ##__VA_ARGS__); \
+            kernel_write(f, __buf, __len, &f->f_pos);   \
+            filp_close(f, NULL);                        \
+        }                                              \
+    } while (0)
+
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("you");
@@ -47,6 +59,7 @@ static bool is_protected_dentry(struct dentry *d) {
     return strcmp(d->d_name.name, "books") == 0 || strcmp(d->d_name.name, "authors") == 0;
 }
 
+#if 0
 static struct inode *get_inode(struct super_block *sb, umode_t mode) {
     struct inode *inode = new_inode(sb);
     if (!inode)
@@ -66,7 +79,21 @@ static struct inode *get_inode(struct super_block *sb, umode_t mode) {
     }
     return inode;
 }
+#endif
 
+static struct inode *get_inode(struct super_block *sb, umode_t mode) {
+    struct inode *inode = new_inode(sb);
+    if (!inode)
+        return NULL;
+
+    inode_init_owner(&init_user_ns, inode, NULL, mode);
+    inode->i_ino = get_next_ino();
+    inode->i_sb = sb;
+    inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+    return inode;
+}
+
+#if 0
 static int books_create(struct user_namespace *ns, struct inode *dir,
                         struct dentry *dentry, umode_t mode, bool excl) {
     struct inode *inode = get_inode(dir->i_sb, S_IFREG | mode);
@@ -77,6 +104,18 @@ static int books_create(struct user_namespace *ns, struct inode *dir,
     d_add(dentry, inode);
     return 0;
 }
+#endif
+static int books_create(struct user_namespace *ns, struct inode *dir,
+                        struct dentry *dentry, umode_t mode, bool excl) {
+    struct inode *inode = get_inode(dir->i_sb, S_IFREG | mode);
+    if (!inode)
+        return -ENOMEM;
+
+    inode->i_uid = current_fsuid();
+    inode->i_fop = &custom_file_ops;
+    d_instantiate(dentry, inode);
+    return 0;
+}
 
 static const struct inode_operations books_dir_iops = {
     .lookup = simple_lookup,
@@ -87,41 +126,111 @@ static void remove_links_to_inode(struct inode *inode) {
     int bkt;
     struct link_entry *entry;
     struct hlist_node *tmp;
+    logf("remove_links_to_inode: start for inode %lu", inode->i_ino);
+
     hash_for_each_safe(link_table, bkt, tmp, entry, node) {
         if (entry->target == inode) {
+            logf("removing link: dentry=%s", entry->link->d_name.name);
             d_delete(entry->link);
             dput(entry->link);
             hash_del(&entry->node);
             kfree(entry);
-            printk(KERN_INFO "customfs: removed link to inode %lu\n", inode->i_ino);
         }
     }
 }
 
+#if 0
 static int custom_mkdir(struct user_namespace *ns, struct inode *dir, struct dentry *dentry, umode_t mode) {
-    if (dir == global_sb->s_root->d_inode)
-        return -EPERM;
+    umode_t mode_only = dir->i_mode & 07777;
+    kuid_t uid = current_fsuid();
 
-    if (S_ISDIR(dir->i_mode)) {
-        umode_t mode_only = dir->i_mode & 07777;
-        if ((mode_only == MODE_AUTHORS || mode_only == MODE_AUTHOR_SUBDIR) &&
-            !uid_eq(current_fsuid(), dir->i_uid))
-            return -EACCES;
+    logf("mkdir: parent ino=%lu, mode=%o, uid=%u, name=%s",
+         dir->i_ino, mode_only, from_kuid(&init_user_ns, uid), dentry->d_name.name);
+
+    if (dir == global_sb->s_root->d_inode) {
+        logf("mkdir denied: attempt to create in root");
+        return -EPERM;
+    }
+
+    // В authors (0777): любой пользователь может создать свою папку
+    if (mode_only == MODE_AUTHORS) {
+        logf("mkdir in authors: allowed");
+    }
+
+    // В подкаталогах authors (01777): только владелец каталога может создавать
+    else if (mode_only == MODE_AUTHOR_SUBDIR && !uid_eq(uid, dir->i_uid)) {
+        logf("mkdir denied in subdir: uid mismatch (dir uid=%u)",
+             from_kuid(&init_user_ns, dir->i_uid));
+        return -EACCES;
     }
 
     struct inode *inode = get_inode(dir->i_sb, S_IFDIR | MODE_AUTHOR_SUBDIR);
-    if (!inode)
+    if (!inode) {
+        logf("mkdir error: get_inode returned NULL");
         return -ENOMEM;
-
-    inode->i_uid = current_fsuid();
-    d_add(dentry, inode);
+    }
+    
+    inode->i_uid = uid;
+    inode->i_op = &fs_dir_iops;
+    inode->i_fop = &simple_dir_operations;
+    
+    d_instantiate(dentry, inode);
     inc_nlink(dir);
+    
+    logf("mkdir success: created %s in ino=%lu by uid=%u",
+         dentry->d_name.name, dir->i_ino, from_kuid(&init_user_ns, uid));
+    return 0;
+}
+#endif
+static int custom_mkdir(struct user_namespace *ns, struct inode *dir, struct dentry *dentry, umode_t mode) {
+    umode_t mode_only = dir->i_mode & 07777;
+    kuid_t uid = current_fsuid();
+
+    logf("mkdir: parent ino=%lu, mode=%o, uid=%u, name=%s",
+         dir->i_ino, mode_only, from_kuid(&init_user_ns, uid), dentry->d_name.name);
+
+    if (dir == global_sb->s_root->d_inode) {
+        logf("mkdir denied: attempt to create in root");
+        return -EPERM;
+    }
+
+    if (mode_only == MODE_AUTHORS) {
+        logf("mkdir in authors: allowed");
+    } else if (mode_only == MODE_AUTHOR_SUBDIR && !uid_eq(uid, dir->i_uid)) {
+        logf("mkdir denied in subdir: uid mismatch (dir uid=%u)",
+             from_kuid(&init_user_ns, dir->i_uid));
+        return -EACCES;
+    }
+
+    struct inode *inode = get_inode(dir->i_sb, S_IFDIR | MODE_AUTHOR_SUBDIR);
+    if (!inode) {
+        logf("mkdir error: get_inode returned NULL");
+        return -ENOMEM;
+    }
+
+    inode->i_uid = uid;
+    inode->i_op = &fs_dir_iops;
+    inode->i_fop = &simple_dir_operations;
+
+    d_instantiate(dentry, inode);
+    inc_nlink(dir);
+
+    logf("mkdir success: created %s in ino=%lu by uid=%u",
+         dentry->d_name.name, dir->i_ino, from_kuid(&init_user_ns, uid));
     return 0;
 }
 
 static int custom_unlink(struct inode *dir, struct dentry *dentry) {
+    logf("custom_unlink: dir ino=%lu, file=%s", dir->i_ino, dentry->d_name.name);
+
     if (dir == global_sb->s_root->d_inode && is_protected_dentry(dentry))
         return -EPERM;
+
+    if (dir == books_inode) {
+        logf("custom_unlink: removing links to inode %lu", d_inode(dentry)->i_ino);
+        remove_links_to_inode(d_inode(dentry));
+    }
+
     return simple_unlink(dir, dentry);
 }
 
@@ -169,8 +278,6 @@ static const struct inode_operations fs_dir_iops = {
 };
 
 static void evict_inode(struct inode *inode) {
-    if (inode->i_sb == global_sb && inode->i_ino && S_ISREG(inode->i_mode))
-        remove_links_to_inode(inode);
     clear_inode(inode);
 }
 
@@ -180,6 +287,7 @@ static const struct super_operations fs_sops = {
     .evict_inode = evict_inode,
 };
 
+#if 0
 static int fill_super(struct super_block *sb, void *data, int silent) {
     struct inode *root_inode = get_inode(sb, S_IFDIR | 0755);
     if (!root_inode)
@@ -207,6 +315,7 @@ static int fill_super(struct super_block *sb, void *data, int silent) {
     struct inode *authors_inode = get_inode(sb, S_IFDIR | MODE_AUTHORS);
     if (!authors_inode)
         return -ENOMEM;
+    authors_inode->i_uid = current_fsuid();
     authors_inode->i_op = &fs_dir_iops;
     authors_inode->i_fop = &simple_dir_operations;
     struct dentry *authors = d_alloc_name(root_dentry, "authors");
@@ -214,6 +323,50 @@ static int fill_super(struct super_block *sb, void *data, int silent) {
 
     return 0;
 }
+#endif
+static int fill_super(struct super_block *sb, void *data, int silent) {
+    struct inode *root_inode = get_inode(sb, S_IFDIR | 0755);
+    if (!root_inode)
+        return -ENOMEM;
+
+    root_inode->i_op = &fs_dir_iops;
+    root_inode->i_fop = &simple_dir_operations;
+
+    struct dentry *root_dentry = d_make_root(root_inode);
+    if (!root_dentry)
+        return -ENOMEM;
+
+    sb->s_root = root_dentry;
+    sb->s_magic = FS_MAGIC;
+    sb->s_op = &fs_sops;
+    global_sb = sb;
+
+    // books
+    books_inode = get_inode(sb, S_IFDIR | MODE_BOOKS);
+    if (!books_inode)
+        return -ENOMEM;
+    books_inode->i_op = &books_dir_iops;
+    books_inode->i_fop = &simple_dir_operations;
+    struct dentry *books = d_alloc_name(root_dentry, "books");
+    if (!books)
+        return -ENOMEM;
+    d_add(books, books_inode);
+
+    // authors
+    struct inode *authors_inode = get_inode(sb, S_IFDIR | MODE_AUTHORS);
+    if (!authors_inode)
+        return -ENOMEM;
+    authors_inode->i_uid = current_fsuid();
+    authors_inode->i_op = &fs_dir_iops;
+    authors_inode->i_fop = &simple_dir_operations;
+    struct dentry *authors = d_alloc_name(root_dentry, "authors");
+    if (!authors)
+        return -ENOMEM;
+    d_add(authors, authors_inode);
+
+    logf("fill_super: books and authors created");
+    return 0;
+}
 
 static struct dentry *mount_fs(struct file_system_type *type, int flags, const char *dev, void *data) {
     return mount_nodev(type, flags, data, fill_super);
@@ -237,3 +390,4 @@ static void __exit fs_exit(void) {
 
 module_init(fs_init);
 module_exit(fs_exit);
+