From: Aurelien Aptel <aaptel@suse.com>
Date: Thu, 18 Mar 2021 13:52:59 +0100
Subject: [PATCH] cifs: export supported mount options via new mount_params
/proc file
Git-commit: 94b0595a8e018ca3cd2edc308eb3ee05c6868eef
Patch-mainline: v5.13-rc1
References: bsc#1192606
Can aid in making mount problems easier to diagnose
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/cifs/cifs_debug.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -17,6 +17,7 @@
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
+#include "fs_context.h"
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
@@ -696,6 +697,7 @@ static const struct file_operations cifs
static const struct file_operations traceSMB_proc_fops;
static const struct file_operations cifs_security_flags_proc_fops;
static const struct file_operations cifs_linux_ext_proc_fops;
+static const struct file_operations cifs_mount_params_proc_fops;
void
cifs_proc_init(void)
@@ -720,6 +722,8 @@ cifs_proc_init(void)
proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
&cifs_lookup_cache_proc_fops);
+ proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_fops);
+
#ifdef CONFIG_CIFS_DFS_UPCALL
proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_fops);
#endif
@@ -758,6 +762,7 @@ cifs_proc_clean(void)
remove_proc_entry("SecurityFlags", proc_fs_cifs);
remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
+ remove_proc_entry("mount_params", proc_fs_cifs);
#ifdef CONFIG_CIFS_DFS_UPCALL
remove_proc_entry("dfscache", proc_fs_cifs);
@@ -1017,6 +1022,51 @@ static const struct file_operations cifs
.release = single_release,
.write = cifs_security_flags_proc_write,
};
+
+/* To make it easier to debug, can help to show mount params */
+static int cifs_mount_params_proc_show(struct seq_file *m, void *v)
+{
+ const struct fs_parameter_spec *p;
+ const char *type;
+
+ for (p = smb3_fs_parameters; p->name; p++) {
+ /* cannot use switch with pointers... */
+ if (!p->type) {
+ if (p->flags == fs_param_neg_with_no)
+ type = "noflag";
+ else
+ type = "flag";
+ } else if (p->type == fs_param_is_bool)
+ type = "bool";
+ else if (p->type == fs_param_is_u32)
+ type = "u32";
+ else if (p->type == fs_param_is_u64)
+ type = "u64";
+ else if (p->type == fs_param_is_string)
+ type = "string";
+ else
+ type = "unknown";
+
+ seq_printf(m, "%s:%s\n", p->name, type);
+ }
+
+ return 0;
+}
+
+static int cifs_mount_params_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, cifs_mount_params_proc_show, NULL);
+}
+
+static const struct file_operations cifs_mount_params_proc_fops = {
+ .open = cifs_mount_params_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ /* No need for write for now */
+ /* .write = cifs_mount_params_proc_write, */
+};
+
#else
inline void cifs_proc_init(void)
{