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cifs: fix soft mounts hanging in the reconnect code 

RHBZ: 1795423

This is the SMB1 version of a patch we already have for SMB2

In recent DFS updates we have a new variable controlling how many times we will
retry to reconnect the share.
If DFS is not used, then this variable is initialized to 0 in:

static inline int
dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
{
        return tl ? tl->tl_numtgts : 0;
}

This means that in the reconnect loop in smb2_reconnect() we will immediately wrap retries to -1
and never actually get to pass this conditional:

                if (--retries)
                        continue;

The effect is that we no longer reach the point where we fail the commands with -EHOSTDOWN
and basically the kernel threads are virtually hung and unkillable.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
This commit is contained in:
Ronnie Sahlberg 2020-02-06 13:55:19 +10:00 committed by Steve French
parent f2bf09e97b
commit 09c40b1535
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/cifssmb.c
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@ -260,7 +260,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
if (server->tcpStatus != CifsNeedReconnect)
break;
if (--retries)
if (retries && --retries)
continue;
/*