From 76fce0b89941e2df06c4b806f6aa21abdd7ed8cc Mon Sep 17 00:00:00 2001
From: Arda Cinar <kuzux92@gmail.com>
Date: Sat, 10 Dec 2022 10:48:28 +0300
Subject: [PATCH] df: Add an option to display used/available inodes

---
 Userland/Utilities/df.cpp | 70 +++++++++++++++++++++++++++++----------
 1 file changed, 52 insertions(+), 18 deletions(-)

diff --git a/Userland/Utilities/df.cpp b/Userland/Utilities/df.cpp
index f92cb3b7bd7..760b0456d20 100644
--- a/Userland/Utilities/df.cpp
+++ b/Userland/Utilities/df.cpp
@@ -13,8 +13,6 @@
 #include <inttypes.h>
 #include <stdlib.h>
 
-static bool flag_human_readable = false;
-
 struct FileSystem {
     DeprecatedString fs;
     size_t total_block_count { 0 };
@@ -27,30 +25,48 @@ struct FileSystem {
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
+    bool flag_human_readable = false;
+    bool flag_inode_info = false;
+
     Core::ArgsParser args_parser;
     args_parser.set_general_help("Display free disk space of each partition.");
     args_parser.add_option(flag_human_readable, "Print human-readable sizes", "human-readable", 'h');
+    args_parser.add_option(flag_inode_info, "Show inode information as well", "inodes", 'i');
     args_parser.parse(arguments);
 
     auto file = TRY(Core::Stream::File::open("/sys/kernel/df"sv, Core::Stream::OpenMode::Read));
 
-    if (flag_human_readable) {
-        outln("Filesystem      Size        Used    Available        Used%   Mount point");
-    } else {
-        outln("Filesystem    Blocks        Used    Available        Used%   Mount point");
+    Vector<StringView> headers;
+    TRY(headers.try_append(flag_human_readable ? "Size"sv : "Blocks"sv));
+    TRY(headers.try_append("Used"sv));
+    TRY(headers.try_append("Available"sv));
+    TRY(headers.try_append("Used%"sv));
+    if (flag_inode_info) {
+        TRY(headers.try_append("Inodes"sv));
+        TRY(headers.try_append("IUsed"sv));
+        TRY(headers.try_append("IAvailable"sv));
+        TRY(headers.try_append("IUsed%"sv));
     }
+    TRY(headers.try_append("Mount point"sv));
+
+    out("{:12} ", "Filesystem");
+
+    for (auto& header : headers)
+        out("{:>12} ", header);
+    outln();
 
     auto file_contents = TRY(file->read_until_eof());
     auto json_result = TRY(JsonValue::from_string(file_contents));
     auto const& json = json_result.as_array();
-    json.for_each([](auto& value) {
+    json.for_each([&](auto& value) {
         auto& fs_object = value.as_object();
         auto fs = fs_object.get("class_name"sv).to_deprecated_string();
         auto total_block_count = fs_object.get("total_block_count"sv).to_u64();
         auto free_block_count = fs_object.get("free_block_count"sv).to_u64();
         auto used_block_count = total_block_count - free_block_count;
-        [[maybe_unused]] auto total_inode_count = fs_object.get("total_inode_count"sv).to_u64();
-        [[maybe_unused]] auto free_inode_count = fs_object.get("free_inode_count"sv).to_u64();
+        auto total_inode_count = fs_object.get("total_inode_count"sv).to_u64();
+        auto free_inode_count = fs_object.get("free_inode_count"sv).to_u64();
+        auto used_inode_count = total_inode_count - free_inode_count;
         auto block_size = fs_object.get("block_size"sv).to_u64();
         auto mount_point = fs_object.get("mount_point"sv).to_deprecated_string();
 
@@ -58,18 +74,36 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         if (total_block_count != 0)
             used_percentage = (used_block_count * 100) / total_block_count;
 
-        out("{:10}", fs);
+        auto used_inode_percentage = 100;
+        if (total_inode_count != 0)
+            used_inode_percentage = (used_inode_count * 100) / total_inode_count;
+
+        out("{:12} ", fs);
 
         if (flag_human_readable) {
-            out("{:>10}  ", human_readable_size(total_block_count * block_size));
-            out("{:>10}   ", human_readable_size(used_block_count * block_size));
-            out("{:>10}   ", human_readable_size(free_block_count * block_size));
-            out("{:>9}%   ", used_percentage);
+            out("{:>12} ", human_readable_size(total_block_count * block_size));
+            out("{:>12} ", human_readable_size(used_block_count * block_size));
+            out("{:>12} ", human_readable_size(free_block_count * block_size));
+            out("{:>11}% ", used_percentage);
         } else {
-            out("{:>10}  ", (uint64_t)total_block_count);
-            out("{:>10}   ", (uint64_t)used_block_count);
-            out("{:>10}   ", (uint64_t)free_block_count);
-            out("{:>9}%   ", used_percentage);
+            out("{:>12} ", (uint64_t)total_block_count);
+            out("{:>12} ", (uint64_t)used_block_count);
+            out("{:>12} ", (uint64_t)free_block_count);
+            out("{:>11}% ", used_percentage);
+        }
+
+        if (flag_inode_info) {
+            if (flag_human_readable) {
+                out("{:>12} ", human_readable_quantity(total_inode_count));
+                out("{:>12} ", human_readable_quantity(used_inode_count));
+                out("{:>12} ", human_readable_quantity(free_inode_count));
+                out("{:>11}% ", used_inode_percentage);
+            } else {
+                out("{:>12} ", (uint64_t)total_inode_count);
+                out("{:>12} ", (uint64_t)used_inode_count);
+                out("{:>12} ", (uint64_t)free_inode_count);
+                out("{:>11}% ", used_inode_percentage);
+            }
         }
 
         out("{}", mount_point);