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@xxxxxxxxxx>
---
fs/smb/client/smb1ops.c | 44 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c
index 0533aca770fc..76e7353f2a72 100644
--- a/fs/smb/client/smb1ops.c
+++ b/fs/smb/client/smb1ops.c
@@ -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:
@@ -1075,6 +1077,47 @@ 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 == le32_to_cpu(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,
@@ -1159,6 +1202,7 @@ 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 = {
--
2.20.1
