On Tue, 18 Jul 2023 10:42:27 -0500
Steve French <smfrench@xxxxxxxxx> wrote:
> I get compile warning:
>
> /home/smfrench/cifs-2.6/fs/smb/client/connect.c: In function
> ‘cifs_get_smb_ses’:
> /home/smfrench/cifs-2.6/fs/smb/client/connect.c:2293:49: warning:
> passing argument 1 of ‘load_nls’ discards ‘const’ qualifier from
> pointer target type [-Wdiscarded-qualifiers]
> 2293 | ses->local_nls = load_nls(ctx->local_nls->charset);
Hi Steve,
Sorry about the mistake I made. I updated the patch with a very small
change:
ses->local_nls = load_nls((char *)ctx->local_nls->charset);
It works, but I'm not sure whether it's clean enough.
Perhaps I should make a change to load_nls() to take a const char *
instead of char *? If this make sense, I'll do it soon.
Find the updated patch as attachment.
--
Thanks,
Winston
>From d9d010797ef790a599b2c8f1993f5b4d64f46352 Mon Sep 17 00:00:00 2001
From: Winston Wen <wentao@xxxxxxxxxxxxx>
Date: Mon, 17 Jul 2023 08:51:50 +0800
Subject: [PATCH] cifs: fix charset issue in reconnection
We need to specify charset, like "iocharset=utf-8", in mount options for
Chinese path if the nls_default don't support it, such as iso8859-1, the
default value for CONFIG_NLS_DEFAULT.
But now in reconnection the nls_default is used, instead of the one we
specified and used in mount, and this can lead to mount failure.
Signed-off-by: Winston Wen <wentao@xxxxxxxxxxxxx>
Reviewed-by: Paulo Alcantara <pc@xxxxxxxxxxxxx>
---
fs/smb/client/cifsglob.h | 1 +
fs/smb/client/cifssmb.c | 3 +--
fs/smb/client/connect.c | 5 +++++
fs/smb/client/misc.c | 1 +
fs/smb/client/smb2pdu.c | 3 +--
5 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index c9a87d0123ce..31cadf9b2a98 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -1062,6 +1062,7 @@ struct cifs_ses {
unsigned long chans_need_reconnect;
/* ========= end: protected by chan_lock ======== */
struct cifs_ses *dfs_root_ses;
+ struct nls_table *local_nls;
};
static inline bool
diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
index 9dee267f1893..25503f1a4fd2 100644
--- a/fs/smb/client/cifssmb.c
+++ b/fs/smb/client/cifssmb.c
@@ -129,7 +129,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
}
spin_unlock(&server->srv_lock);
- nls_codepage = load_nls_default();
+ nls_codepage = ses->local_nls;
/*
* need to prevent multiple threads trying to simultaneously
@@ -200,7 +200,6 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
rc = -EAGAIN;
}
- unload_nls(nls_codepage);
return rc;
}
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 5dd09c6d762e..bec0e893be06 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -1842,6 +1842,10 @@ static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
CIFS_MAX_PASSWORD_LEN))
return 0;
}
+
+ if (strcmp(ctx->local_nls->charset, ses->local_nls->charset))
+ return 0;
+
return 1;
}
@@ -2286,6 +2290,7 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
ses->sectype = ctx->sectype;
ses->sign = ctx->sign;
+ ses->local_nls = load_nls(ctx->local_nls->charset);
/* add server as first channel */
spin_lock(&ses->chan_lock);
diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c
index 70dbfe6584f9..d7e85d9a2655 100644
--- a/fs/smb/client/misc.c
+++ b/fs/smb/client/misc.c
@@ -95,6 +95,7 @@ sesInfoFree(struct cifs_ses *buf_to_free)
return;
}
+ unload_nls(buf_to_free->local_nls);
atomic_dec(&sesInfoAllocCount);
kfree(buf_to_free->serverOS);
kfree(buf_to_free->serverDomain);
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index e04766fe6f80..a457f07f820d 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -242,7 +242,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
}
spin_unlock(&server->srv_lock);
- nls_codepage = load_nls_default();
+ nls_codepage = ses->local_nls;
/*
* need to prevent multiple threads trying to simultaneously
@@ -324,7 +324,6 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
rc = -EAGAIN;
}
failed:
- unload_nls(nls_codepage);
return rc;
}
--
2.40.1
