Add ability to dipslay SMB3 share flags and capabilities for debugging

SMB3 protocol adds various optional per-share capabilities (and
SMB3.02 adds one more beyond that).  Add ability to dump
(/proc/fs/cifs/DebugData) the share capabilities and share flags to
improve debugging.

Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Jeff Layton <jlayton@redhat.com>

4 files changed, 26 insertions, 2 deletions

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 856f8f5fc295..0315824bbf01 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -213,7 +213,7 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
                                                    tcon->nativeFileSystem);
                                 }
                                 seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
-                                        "\nPathComponentMax: %d Status: 0x%d",
+                                        "\n\tPathComponentMax: %d Status: 0x%d",
                                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
                                         le32_to_cpu(tcon->fsAttrInfo.Attributes),
                                         le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
@@ -224,6 +224,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
                                         seq_puts(m, " type: CDROM ");
                                 else
                                         seq_printf(m, " type: %d ", dev_type);
+                                if (server->ops->dump_share_caps)
+                                        server->ops->dump_share_caps(m, tcon);
 
                                 if (tcon->need_reconnect)
                                         seq_puts(m, "\tDISCONNECTED ");
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index f13cbbeaf098..9a1e37aad3b8 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -223,6 +223,7 @@ struct smb_version_operations {
         void (*dump_detail)(void *);
         void (*clear_stats)(struct cifs_tcon *);
         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
+        void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
         /* verify the message */
         int (*check_message)(char *, unsigned int);
         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
@@ -809,7 +810,7 @@ struct cifs_tcon {
 #ifdef CONFIG_CIFS_SMB2
         bool print:1;           /* set if connection to printer share */
         bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
-        __u32 capabilities;
+        __le32 capabilities;
         __u32 share_flags;
         __u32 maximal_access;
         __u32 vol_serial_number;
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 14539c71e6e6..76df656e4b2d 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -281,6 +281,25 @@ smb2_clear_stats(struct cifs_tcon *tcon)
 }
 
 static void
+smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
+{
+        seq_puts(m, "\n\tShare Capabilities:");
+        if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
+                seq_puts(m, " DFS,");
+        if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
+                seq_puts(m, " CONTINUOUS AVAILABILITY,");
+        if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
+                seq_puts(m, " SCALEOUT,");
+        if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
+                seq_puts(m, " CLUSTER,");
+        if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
+                seq_puts(m, " ASYMMETRIC,");
+        if (tcon->capabilities == 0)
+                seq_puts(m, " None");
+        seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
+}
+
+static void
 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 {
 #ifdef CONFIG_CIFS_STATS
@@ -645,6 +664,7 @@ struct smb_version_operations smb30_operations = {
         .dump_detail = smb2_dump_detail,
         .clear_stats = smb2_clear_stats,
         .print_stats = smb2_print_stats,
+        .dump_share_caps = smb2_dump_share_caps,
         .is_oplock_break = smb2_is_valid_oplock_break,
         .need_neg = smb2_need_neg,
         .negotiate = smb2_negotiate,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index cb155bfb3411..f7422a68b163 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -741,6 +741,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
         }
 
         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
+        tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
         tcon->tidStatus = CifsGood;
         tcon->need_reconnect = false;