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cifs: serialize all mount attempts

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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: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2022-01-18 12:16:57 +10:00 committed by Steve French
parent a2809d0e16
commit 5455b9ecaf
1 changed files with 7 additions and 1 deletions
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8
fs/cifs/fs_context.c
View file

@ -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)