[v4,07/11] cifs: Add witness information to debug data dump

+ Indicate if witness feature is supported
+ Indicate if witness is used when dumping tcons
+ Dumps witness registrations. Example:
  Witness registrations:
  Id: 1 Refs: 1 Network name: 'fs.fover.ad'(y) Share name: 'share1'(y) \
    Ip address: 192.168.103.200(n)

Signed-off-by: Samuel Cabrero <scabrero@suse.de>
---
 fs/cifs/cifs_debug.c | 13 +++++++++++++
 fs/cifs/cifs_swn.c   | 35 +++++++++++++++++++++++++++++++++++
 fs/cifs/cifs_swn.h   |  2 ++
 3 files changed, 50 insertions(+)

tentatively merged into cifs-2.6.git for-next, let me know if any
changes needed to be made to it.

On Mon, Nov 30, 2020 at 12:05 PM Samuel Cabrero <scabrero@suse.de> wrote:
>
> + Indicate if witness feature is supported
> + Indicate if witness is used when dumping tcons
> + Dumps witness registrations. Example:
>   Witness registrations:
>   Id: 1 Refs: 1 Network name: 'fs.fover.ad'(y) Share name: 'share1'(y) \
>     Ip address: 192.168.103.200(n)
>
> Signed-off-by: Samuel Cabrero <scabrero@suse.de>
> ---
>  fs/cifs/cifs_debug.c | 13 +++++++++++++
>  fs/cifs/cifs_swn.c   | 35 +++++++++++++++++++++++++++++++++++
>  fs/cifs/cifs_swn.h   |  2 ++
>  3 files changed, 50 insertions(+)
>
> diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
> index 53588d7517b4..b231dcf1d1f9 100644
> --- a/fs/cifs/cifs_debug.c
> +++ b/fs/cifs/cifs_debug.c
> @@ -23,6 +23,9 @@
>  #ifdef CONFIG_CIFS_SMB_DIRECT
>  #include "smbdirect.h"
>  #endif
> +#ifdef CONFIG_CIFS_SWN_UPCALL
> +#include "cifs_swn.h"
> +#endif
>
>  void
>  cifs_dump_mem(char *label, void *data, int length)
> @@ -115,6 +118,10 @@ static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
>                 seq_printf(m, " POSIX Extensions");
>         if (tcon->ses->server->ops->dump_share_caps)
>                 tcon->ses->server->ops->dump_share_caps(m, tcon);
> +#ifdef CONFIG_CIFS_SWN_UPCALL
> +       if (tcon->use_witness)
> +               seq_puts(m, " Witness");
> +#endif
>
>         if (tcon->need_reconnect)
>                 seq_puts(m, "\tDISCONNECTED ");
> @@ -262,6 +269,9 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
>         seq_printf(m, ",XATTR");
>  #endif
>         seq_printf(m, ",ACL");
> +#ifdef CONFIG_CIFS_SWN_UPCALL
> +       seq_puts(m, ",WITNESS");
> +#endif
>         seq_putc(m, '\n');
>         seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
>         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
> @@ -462,6 +472,9 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
>         spin_unlock(&cifs_tcp_ses_lock);
>         seq_putc(m, '\n');
>
> +#ifdef CONFIG_CIFS_SWN_UPCALL
> +       cifs_swn_dump(m);
> +#endif
>         /* BB add code to dump additional info such as TCP session info now */
>         return 0;
>  }
> diff --git a/fs/cifs/cifs_swn.c b/fs/cifs/cifs_swn.c
> index 63b0764af5d5..140a53a19aa0 100644
> --- a/fs/cifs/cifs_swn.c
> +++ b/fs/cifs/cifs_swn.c
> @@ -505,3 +505,38 @@ int cifs_swn_unregister(struct cifs_tcon *tcon)
>
>         return 0;
>  }
> +
> +void cifs_swn_dump(struct seq_file *m)
> +{
> +       struct cifs_swn_reg *swnreg;
> +       struct sockaddr_in *sa;
> +       struct sockaddr_in6 *sa6;
> +       int id;
> +
> +       seq_puts(m, "Witness registrations:");
> +
> +       mutex_lock(&cifs_swnreg_idr_mutex);
> +       idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
> +               seq_printf(m, "\nId: %u Refs: %u Network name: '%s'%s Share name: '%s'%s Ip address: ",
> +                               id, kref_read(&swnreg->ref_count),
> +                               swnreg->net_name, swnreg->net_name_notify ? "(y)" : "(n)",
> +                               swnreg->share_name, swnreg->share_name_notify ? "(y)" : "(n)");
> +               switch (swnreg->tcon->ses->server->dstaddr.ss_family) {
> +               case AF_INET:
> +                       sa = (struct sockaddr_in *) &swnreg->tcon->ses->server->dstaddr;
> +                       seq_printf(m, "%pI4", &sa->sin_addr.s_addr);
> +                       break;
> +               case AF_INET6:
> +                       sa6 = (struct sockaddr_in6 *) &swnreg->tcon->ses->server->dstaddr;
> +                       seq_printf(m, "%pI6", &sa6->sin6_addr.s6_addr);
> +                       if (sa6->sin6_scope_id)
> +                               seq_printf(m, "%%%u", sa6->sin6_scope_id);
> +                       break;
> +               default:
> +                       seq_puts(m, "(unknown)");
> +               }
> +               seq_printf(m, "%s", swnreg->ip_notify ? "(y)" : "(n)");
> +       }
> +       mutex_unlock(&cifs_swnreg_idr_mutex);
> +       seq_puts(m, "\n");
> +}
> diff --git a/fs/cifs/cifs_swn.h b/fs/cifs/cifs_swn.h
> index 7ef9ecedbd05..13b25cdc9295 100644
> --- a/fs/cifs/cifs_swn.h
> +++ b/fs/cifs/cifs_swn.h
> @@ -18,4 +18,6 @@ extern int cifs_swn_unregister(struct cifs_tcon *tcon);
>
>  extern int cifs_swn_notify(struct sk_buff *skb, struct genl_info *info);
>
> +extern void cifs_swn_dump(struct seq_file *m);
> +
>  #endif /* _CIFS_SWN_H */
> --
> 2.29.2
>