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cifs: Implement is_network_name_deleted for SMB1

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This change allows Linux SMB1 client to autoreconnect the share when it is
modified on server by admin operation which removes and re-adds it.

Implementation is reused from SMB2+ is_network_name_deleted callback. There
are just adjusted checks for error codes and access to struct smb_hdr.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pali Rohár 2024-10-26 20:55:47 +02:00 committed by Steve French
parent f83e10a233
commit 28753e4304
1 changed files with 44 additions and 0 deletions
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44
fs/smb/client/smb1ops.c
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@ -14,6 +14,8 @@
#include "cifspdu.h"
#include "cifs_unicode.h"
#include "fs_context.h"
#include "nterr.h"
#include "smberr.h"
/*
* An NT cancel request header looks just like the original request except:
@ -1062,6 +1064,47 @@ cifs_make_node(unsigned int xid, struct inode *inode,
full_path, mode, dev);
}
static bool
cifs_is_network_name_deleted(char *buf, struct TCP_Server_Info *server)
{
struct smb_hdr *shdr = (struct smb_hdr *)buf;
struct TCP_Server_Info *pserver;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
if (shdr->Flags2 & SMBFLG2_ERR_STATUS) {
if (shdr->Status.CifsError != cpu_to_le32(NT_STATUS_NETWORK_NAME_DELETED))
return false;
} else {
if (shdr->Status.DosError.ErrorClass != ERRSRV ||
shdr->Status.DosError.Error != cpu_to_le16(ERRinvtid))
return false;
}
/* If server is a channel, select the primary channel */
pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
if (cifs_ses_exiting(ses))
continue;
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
if (tcon->tid == shdr->Tid) {
spin_lock(&tcon->tc_lock);
tcon->need_reconnect = true;
spin_unlock(&tcon->tc_lock);
spin_unlock(&cifs_tcp_ses_lock);
pr_warn_once("Server share %s deleted.\n",
tcon->tree_name);
return true;
}
}
}
spin_unlock(&cifs_tcp_ses_lock);
return false;
}
struct smb_version_operations smb1_operations = {
.send_cancel = send_nt_cancel,
.compare_fids = cifs_compare_fids,
@ -1146,6 +1189,7 @@ struct smb_version_operations smb1_operations = {
.get_acl_by_fid = get_cifs_acl_by_fid,
.set_acl = set_cifs_acl,
.make_node = cifs_make_node,
.is_network_name_deleted = cifs_is_network_name_deleted,
};
struct smb_version_values smb1_values = {