Commit 5455b9ec authored by Ronnie Sahlberg's avatar Ronnie Sahlberg Committed by Steve French
Browse files

cifs: serialize all mount attempts 



RHBZ: 2008434

Some servers, such as Windows2016 have a very low number of concurrent mounts that
they allow from each client.
This can be a problem if you have a more than a handful (==3 in this case)
of cifs entries in your fstab and cause a number of the mounts there to randomly fail.

Add a global mutex and use it to serialize all mount attempts.

Signed-off-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent a2809d0e

fs/cifs/fs_context.c

+7 −1
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ 
#include "rfc1002pdu.h"

#include "fs_context.h"



static DEFINE_MUTEX(cifs_mount_mutex);



static const match_table_t cifs_smb_version_tokens = {

	{ Smb_1, SMB1_VERSION_STRING },

	{ Smb_20, SMB20_VERSION_STRING},
@@ -707,10 +709,14 @@ static int smb3_get_tree_common(struct fs_context *fc) 
static int smb3_get_tree(struct fs_context *fc)

{

	int err = smb3_fs_context_validate(fc);

	int ret;



	if (err)

		return err;

	return smb3_get_tree_common(fc);

	mutex_lock(&cifs_mount_mutex);

	ret = smb3_get_tree_common(fc);

	mutex_unlock(&cifs_mount_mutex);

	return ret;

}



static void smb3_fs_context_free(struct fs_context *fc)