7

libfs.c

@@ -59,8 +59,10 @@ static ssize_t dummy_write(struct file *file, const char __user *buf, size_t len
     struct inode *inode = file_inode(file);
     loff_t new_end = *ppos + len;
 
-    if (inode->i_size < new_end) inode->i_size = new_end;
+    if (inode->i_size < new_end)
-    *ppos += len;
+        inode->i_size = new_end;
+
+    *ppos = new_end;
     mark_inode_dirty(inode);
     return len;
 }
@@ -128,20 +130,43 @@ static int books_create(struct user_namespace *ns, struct inode *dir,
         return -ENOMEM;
 
     inode->i_uid = current_fsuid();
-//    inode->i_op = &simple_file_inode_operations;
     inode->i_op = &custom_file_inode_operations;
     inode->i_fop = &custom_file_ops;
-//    d_instantiate(dentry, inode);
+    logf("books_create: dentry addr=%px, inode=%px", dentry, inode);
-    d_add(dentry, inode);
+    d_instantiate(dentry, inode);
+    inc_nlink(inode);
+    logf("books_create: d_instantiate done, dentry->d_inode=%px", dentry->d_inode);
     logf("dentry flags: %u, dentry name: %s", dentry->d_flags, dentry->d_name.name);
     mark_inode_dirty(inode);
-
     logf("books_create: created file %s (ino=%lu)", dentry->d_name.name, inode->i_ino);
     return 0;
 }
 
+#if 0
+static struct dentry *books_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
+    logf("books_lookup: looking for %s in ino=%lu", dentry->d_name.name, dir->i_ino);
+    return simple_lookup(dir, dentry, flags);
+}
+#endif
+static struct dentry *books_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
+    struct dentry *child;
+
+    logf("books_lookup: looking for %s in ino=%lu", dentry->d_name.name, dir->i_ino);
+
+    child = d_lookup(dentry->d_parent, &dentry->d_name);
+    if (child) {
+        d_add(dentry, d_inode(child));  // связываем найденное inode
+        dput(child);
+    } else {
+        d_add(dentry, NULL);  // файл не найден
+    }
+
+    return NULL; // всегда возвращается NULL в lookup
+}
+
+
 static const struct inode_operations books_dir_iops = {
-    .lookup = simple_lookup,
+    .lookup = books_lookup,
     .create = books_create,
 };
 
@@ -236,6 +261,7 @@ static int custom_mkdir(struct user_namespace *ns, struct inode *dir, struct den
     inode->i_fop = &simple_dir_operations;
 
     d_instantiate(dentry, inode);
+    inc_nlink(inode);
     inc_nlink(dir);
 
     logf("mkdir success: created %s in ino=%lu by uid=%u",
@@ -291,6 +317,23 @@ static int custom_link(struct dentry *old_dentry, struct inode *dir, struct dent
     return r;
 }
 
+static struct dentry *fs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
+    struct dentry *found;
+
+    logf("fs_lookup: looking for %s in ino=%lu", dentry->d_name.name, dir->i_ino);
+
+    found = d_lookup(dentry->d_parent, &dentry->d_name);
+    if (found) {
+        d_add(dentry, d_inode(found));
+        dput(found);
+    } else {
+        d_add(dentry, NULL);
+    }
+
+    return NULL;
+}
+
+#if 0
 static const struct inode_operations fs_dir_iops = {
     .lookup = simple_lookup,
     .mkdir = custom_mkdir,
@@ -299,6 +342,15 @@ static const struct inode_operations fs_dir_iops = {
     .rename = custom_rename,
     .link = custom_link,
 };
+#endif
+static const struct inode_operations fs_dir_iops = {
+    .lookup = fs_lookup,
+    .mkdir = custom_mkdir,
+    .unlink = custom_unlink,
+    .rmdir = custom_rmdir,
+    .rename = custom_rename,
+    .link = custom_link,
+};
 
 static void evict_inode(struct inode *inode) {
     clear_inode(inode);