From a0175b09d29880de99ece9832d52161f33155494 Mon Sep 17 00:00:00 2001
From: Saagar Jha <saagar@saagarjha.com>
Date: Sun, 26 Dec 2021 16:48:55 -0800
Subject: [PATCH] Revert "Add /proc/filesystems"

---
 fs/mount.c     | 15 ---------------
 fs/proc/root.c |  7 -------
 kernel/fs.h    |  1 -
 3 files changed, 23 deletions(-)

diff --git a/fs/mount.c b/fs/mount.c
index e0ac6ac6..9763f346 100644
--- a/fs/mount.c
+++ b/fs/mount.c
@@ -23,21 +23,6 @@ void fs_register(const struct fs_ops *fs) {
     assert(!"reached filesystem limit");
 }
 
-char * get_filesystems(void) {
-    char *fs_list = calloc(MAX_FILESYSTEMS * 50, sizeof(char)); // Reasonable assumption?
-    unsigned int i;
-
-    for ( i = 0; i < MAX_FILESYSTEMS; i++ ) {
-        if (filesystems[i] != NULL) {
-            fs_list = strcat(fs_list, "nodev    ");
-            fs_list = strcat(fs_list, filesystems[i]->name);
-            fs_list = strcat(fs_list, "\n");
-        }
-    }
-
-    return fs_list;
-}
-
 struct mount *mount_find(char *path) {
     assert(path_is_normalized(path));
     lock(&mounts_lock);
diff --git a/fs/proc/root.c b/fs/proc/root.c
index f0ef52ab..8cd0d4bc 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -22,12 +22,6 @@ static void show_kb(struct proc_data *buf, const char *name, uint64_t value) {
     proc_printf(buf, "%s%8"PRIu64" kB\n", name, value / 1000);
 }
 
-static int proc_show_filesystems(struct proc_entry *UNUSED(entry), struct proc_data *buf) {
-    char *filesystems = get_filesystems();
-    proc_printf(buf, "%s", filesystems);
-    return 0;
-}
-
 static int proc_show_meminfo(struct proc_entry *UNUSED(entry), struct proc_data *buf) {
     struct mem_usage usage = get_mem_usage();
     show_kb(buf, "MemTotal:       ", usage.total);
@@ -103,7 +97,6 @@ static int proc_show_mounts(struct proc_entry *UNUSED(entry), struct proc_data *
 
 // in alphabetical order
 struct proc_dir_entry proc_root_entries[] = {
-    {"filesystems", .show = proc_show_filesystems},
     {"ish", S_IFDIR, .children = &proc_ish_children},
     {"meminfo", .show = proc_show_meminfo},
     {"mounts", .show = proc_show_mounts},
diff --git a/kernel/fs.h b/kernel/fs.h
index 8d32bfe5..5a8154cc 100644
--- a/kernel/fs.h
+++ b/kernel/fs.h
@@ -174,6 +174,5 @@ extern const struct fs_ops fakefs;
 extern const struct fs_ops devptsfs;
 extern const struct fs_ops tmpfs;
 void fs_register(const struct fs_ops *fs);
-char* get_filesystems(void); // For /proc/filesystems
 
 #endif