On Thu, Mar 10, 2011 at 10:33 PM, Steve French <smfrench@xxxxxxxxx> wrote:
> [PATCH] [CIFS] do not try to dump cifs mids from smb2 sessions
>
> Convert the debug routines in cifs_debug.c to recognize
> smb2 sessions and not try to dump invalid information on
> pending requests. Check the socket type to see if
> smb2. Move the printing of cifs specific debug information
> to a helper routine to make it clearer which type
> of information we are printing.
>
> cifs and smb2 both use the struct TCP_Server_Info to include information about
> the tcp socket connection to the server. The list of pending requests
> is one of the "per-socket" pieces of information. smb2 and cifs
> "mid" queue entries (multiplexed network requests, the active requests
> on the wire) differ. smb2 has async support in the protocol,
> as well as operation compounding and larger sizes (than cifs) for
> various fields related to pending requests) so it is important
> not to try to use the pending_mid_q for smb2 tcp sessions
> as if it were a pending cifs request. Most usage of the
> pending_mid_q is safe because it is in either cifs or smb2
> specific code, but this patch fixes the dumping of debug
> data so we don't dump cifs debug data for an smb2 session.
>
> Signed-off-by: Steve French <sfrench@xxxxxxxxxx>
> ---
> fs/cifs/cifs_debug.c | 177 +++++++++++++++++++++++++++-----------------------
> 1 files changed, 96 insertions(+), 81 deletions(-)
>
> diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
> index d925cf6..c071599 100644
> --- a/fs/cifs/cifs_debug.c
> +++ b/fs/cifs/cifs_debug.c
> @@ -72,7 +72,7 @@ void cifs_dump_mids(struct TCP_Server_Info *server)
> struct list_head *tmp;
> struct mid_q_entry *mid_entry;
>
> - if (server == NULL)
> + if ((server == NULL) || (server->is_smb2))
> return;
>
> cERROR(1, "Dump pending requests:");
> @@ -105,16 +105,103 @@ void cifs_dump_mids(struct TCP_Server_Info *server)
> #endif /* CONFIG_CIFS_DEBUG2 */
>
> #ifdef CONFIG_PROC_FS
> -static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
> +
> +static void dump_smb2_debug_info(int i, struct seq_file *m,
> + struct TCP_Server_Info *server)
> {
> - struct list_head *tmp1, *tmp2, *tmp3;
> + seq_printf("dumping debug information for smb2 not supported yet\n");
> +}
> +
> +static void dump_cifs_debug_info(int i, struct seq_file *m,
> + struct TCP_Server_Info *server)
> +{
> + struct list_head *tmp2, *tmp3;
> struct mid_q_entry *mid_entry;
> - struct TCP_Server_Info *server;
> struct cifs_ses *ses;
> struct cifs_tcon *tcon;
> - int i, j;
> + int j;
> __u32 dev_type;
>
> +
> + list_for_each(tmp2, &server->smb_ses_list) {
> + ses = list_entry(tmp2, struct cifs_ses, smb_ses_list);
> + if ((ses->serverDomain == NULL) || (ses->serverOS == NULL) ||
> + (ses->serverNOS == NULL)) {
> + seq_printf(m, "\n%d) entry for %s not fully "
> + "displayed\n\t", i, ses->serverName);
> + } else {
> + seq_printf(m,
> + "\n%d) Name: %s Domain: %s Uses: %d OS:"
> + " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
> + " session status: %d\t",
> + i, ses->serverName, ses->serverDomain,
> + ses->ses_count, ses->serverOS, ses->serverNOS,
> + ses->capabilities, ses->status);
> + }
> + seq_printf(m, "TCP status: %d\n\tLocal Users To "
> + "Server: %d SecMode: 0x%x Req On Wire: %d",
> + server->tcpStatus, server->srv_count,
> + server->sec_mode,
> + atomic_read(&server->inFlight));
> +
> +#ifdef CONFIG_CIFS_STATS2
> + seq_printf(m, " In Send: %d In MaxReq Wait: %d",
> + atomic_read(&server->inSend),
> + atomic_read(&server->num_waiters));
> +#endif
> +
> + seq_puts(m, "\n\tShares:");
> + j = 0;
> + list_for_each(tmp3, &ses->tcon_list) {
> + tcon = list_entry(tmp3, struct cifs_tcon, tcon_list);
> + ++j;
> + dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
> + seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
> + tcon->treeName, tcon->tc_count);
> + if (tcon->nativeFileSystem) {
> + seq_printf(m, "Type: %s ",
> + tcon->nativeFileSystem);
> + }
> + seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
> + "\nPathComponentMax: %d Status: 0x%d",
> + le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
> + le32_to_cpu(tcon->fsAttrInfo.Attributes),
> + le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
> + tcon->tidStatus);
> + if (dev_type == FILE_DEVICE_DISK)
> + seq_puts(m, " type: DISK ");
> + else if (dev_type == FILE_DEVICE_CD_ROM)
> + seq_puts(m, " type: CDROM ");
> + else
> + seq_printf(m, " type: %d ", dev_type);
> +
> + if (tcon->need_reconnect)
> + seq_puts(m, "\tDISCONNECTED ");
> + seq_putc(m, '\n');
> + }
> +
> + seq_puts(m, "\n\tMIDs:\n");
> +
> + spin_lock(&GlobalMid_Lock);
> + list_for_each(tmp3, &server->pending_mid_q) {
> + mid_entry = list_entry(tmp3, struct mid_q_entry, qhead);
> + seq_printf(m, "\tState: %d com: %d pid:"
> + " %d cbdata: %p mid %d\n",
> + mid_entry->midState,
> + (int)mid_entry->command, mid_entry->pid,
> + mid_entry->callback_data,
> + mid_entry->mid);
> + }
> + spin_unlock(&GlobalMid_Lock);
> + }
> +}
> +
> +static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
> +{
> + struct list_head *tmp1;
> + struct TCP_Server_Info *server;
> + int i;
> +
> seq_puts(m,
> "Display Internal CIFS Data Structures for Debugging\n"
> "---------------------------------------------------\n");
> @@ -151,82 +238,10 @@ static int cifs_debug_data_proc_show(struct
> seq_file *m, void *v)
> server = list_entry(tmp1, struct TCP_Server_Info,
> tcp_ses_list);
> i++;
> - list_for_each(tmp2, &server->smb_ses_list) {
> - ses = list_entry(tmp2, struct cifs_ses,
> - smb_ses_list);
> - if ((ses->serverDomain == NULL) ||
> - (ses->serverOS == NULL) ||
> - (ses->serverNOS == NULL)) {
> - seq_printf(m, "\n%d) entry for %s not fully "
> - "displayed\n\t", i, ses->serverName);
> - } else {
> - seq_printf(m,
> - "\n%d) Name: %s Domain: %s Uses: %d OS:"
> - " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
> - " session status: %d\t",
> - i, ses->serverName, ses->serverDomain,
> - ses->ses_count, ses->serverOS, ses->serverNOS,
> - ses->capabilities, ses->status);
> - }
> - seq_printf(m, "TCP status: %d\n\tLocal Users To "
> - "Server: %d SecMode: 0x%x Req On Wire: %d",
> - server->tcpStatus, server->srv_count,
> - server->sec_mode,
> - atomic_read(&server->inFlight));
> -
> -#ifdef CONFIG_CIFS_STATS2
> - seq_printf(m, " In Send: %d In MaxReq Wait: %d",
> - atomic_read(&server->inSend),
> - atomic_read(&server->num_waiters));
> -#endif
> -
> - seq_puts(m, "\n\tShares:");
> - j = 0;
> - list_for_each(tmp3, &ses->tcon_list) {
> - tcon = list_entry(tmp3, struct cifs_tcon,
> - tcon_list);
> - ++j;
> - dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
> - seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
> - tcon->treeName, tcon->tc_count);
> - if (tcon->nativeFileSystem) {
> - seq_printf(m, "Type: %s ",
> - tcon->nativeFileSystem);
> - }
> - seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
> - "\nPathComponentMax: %d Status: 0x%d",
> - le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
> - le32_to_cpu(tcon->fsAttrInfo.Attributes),
> - le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
> - tcon->tidStatus);
> - if (dev_type == FILE_DEVICE_DISK)
> - seq_puts(m, " type: DISK ");
> - else if (dev_type == FILE_DEVICE_CD_ROM)
> - seq_puts(m, " type: CDROM ");
> - else
> - seq_printf(m, " type: %d ", dev_type);
> -
> - if (tcon->need_reconnect)
> - seq_puts(m, "\tDISCONNECTED ");
> - seq_putc(m, '\n');
> - }
> -
> - seq_puts(m, "\n\tMIDs:\n");
> -
> - spin_lock(&GlobalMid_Lock);
> - list_for_each(tmp3, &server->pending_mid_q) {
> - mid_entry = list_entry(tmp3, struct mid_q_entry,
> - qhead);
> - seq_printf(m, "\tState: %d com: %d pid:"
> - " %d cbdata: %p mid %d\n",
> - mid_entry->midState,
> - (int)mid_entry->command,
> - mid_entry->pid,
> - mid_entry->callback_data,
> - mid_entry->mid);
> - }
> - spin_unlock(&GlobalMid_Lock);
> - }
> + if (server->is_smb2)
> + dump_smb2_debug_info(i, m, server);
> + else
> + dump_cifs_debug_info(i, m, server);
> }
> spin_unlock(&cifs_tcp_ses_lock);
I suppose there would not be a smb2_tcp_ses_lock!
Also, although I have not see any issues, is it ok to take a spinlock
within a spinlock (GloablMid_Lock while holding cifs_tcp_ses_lock)?
> seq_putc(m, '\n');
>
> --
> Thanks,
>
> Steve
> --
> To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
