Commit 94b0595a authored by Aurelien Aptel's avatar Aurelien Aptel Committed by Steve French
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cifs: export supported mount options via new mount_params /proc file 



Can aid in making mount problems easier to diagnose

Signed-off-by: default avatarAurelien Aptel <aaptel@suse.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 24fedddc

fs/cifs/cifs_debug.c

+50 −0
Original line number Diff line number Diff line
@@ -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 proc_ops cifs_lookup_cache_proc_ops; 
static const struct proc_ops traceSMB_proc_ops;

static const struct proc_ops cifs_security_flags_proc_ops;

static const struct proc_ops cifs_linux_ext_proc_ops;

static const struct proc_ops cifs_mount_params_proc_ops;



void

cifs_proc_init(void)
@@ -720,6 +722,8 @@ cifs_proc_init(void) 
	proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,

		    &cifs_lookup_cache_proc_ops);



	proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_ops);



#ifdef CONFIG_CIFS_DFS_UPCALL

	proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_ops);

#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 proc_ops cifs_security_flags_proc_ops = { 
	.proc_release	= single_release,

	.proc_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 proc_ops cifs_mount_params_proc_ops = {

	.proc_open	= cifs_mount_params_proc_open,

	.proc_read	= seq_read,

	.proc_lseek	= seq_lseek,

	.proc_release	= single_release,

	/* No need for write for now */

	/* .proc_write	= cifs_mount_params_proc_write, */

};



#else

inline void cifs_proc_init(void)

{