From 325054f9f07d842cae41681c53165de878675509 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@microsoft.com>
Date: Sun, 21 Oct 2018 23:36:39 -0500
Subject: [PATCH] smb3: allow more detailed protocol info on open files for
debugging
In order to debug complex problems it is often helpful to
have detailed information on the client and server view
of the open file information. Add the ability for root to
view the list of smb3 open files and dump the persistent
handle and other info so that it can be more easily
correlated with server logs.
Sample output:
Display debugging information for open files
treeid: 0x8dce084 \\localhost\test
Persistent fid: 0xaddde0a9 name: rofile flags 0x8000 count 1 pid: 7860 uid: 1000 mid 0x30
Persistent fid: 0xd634fe34 name: smallfile flags 0x8000 count 1 pid: 7858 uid: 1000 mid 0x24
Persistent fid: 0xc90bfdc9 name: smallfile flags 0x8000 count 1 pid: 7857 uid: 1000 mid 0x1a
treeid: 0x34b9815b \\localhost\scratch
Persistent fid: 0x86a6e394 name: f71 flags 0x8000 count 1 pid: 7861 uid: 1000 mid 0x20
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifs_debug.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/cifsglob.h | 3 +++
fs/cifs/smb2ops.c | 3 +++
fs/cifs/smb2pdu.c | 3 +++
4 files changed, 59 insertions(+)
@@ -145,6 +145,52 @@ cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
}
+static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
+{
+ struct list_head *stmp, *tmp, *tmp1, *tmp2;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon;
+ struct cifsFileInfo *cfile;
+
+ seq_puts(m, "Display debugging information for open files\n");
+ spin_lock(&cifs_tcp_ses_lock);
+ list_for_each(stmp, &cifs_tcp_ses_list) {
+ server = list_entry(stmp, struct TCP_Server_Info,
+ tcp_ses_list);
+ list_for_each(tmp, &server->smb_ses_list) {
+ ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
+ list_for_each(tmp1, &ses->tcon_list) {
+ tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
+ seq_printf(m, "\ntreeid: 0x%x %s\n", tcon->tid, tcon->treeName);
+ spin_lock(&tcon->open_file_lock);
+ list_for_each(tmp2, &tcon->openFileList) {
+ cfile = list_entry(tmp2, struct cifsFileInfo,
+ tlist);
+ seq_printf(m,
+ "Persistent fid: 0x%llx name: %s flags 0x%x count %d pid: %d uid: %d",
+ cfile->fid.persistent_fid,
+ cfile->dentry->d_name.name,
+ cfile->f_flags,
+ cfile->count,
+ cfile->pid,
+ from_kuid(&init_user_ns,
+ cfile->uid));
+#ifdef CONFIG_CIFS_DEBUG2
+ seq_printf(m, " mid 0x%llx\n", cfile->fid.mid);
+#else
+ seq_printf(m, "\n");
+#endif /* CIFS_DEBUG2 */
+ }
+ spin_unlock(&tcon->open_file_lock);
+ }
+ }
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
+ seq_putc(m, '\n');
+ return 0;
+}
+
static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
{
struct list_head *tmp1, *tmp2, *tmp3;
@@ -565,6 +611,9 @@ cifs_proc_init(void)
proc_create_single("DebugData", 0, proc_fs_cifs,
cifs_debug_data_proc_show);
+ proc_create_single("open_files", 0400, proc_fs_cifs,
+ cifs_debug_files_proc_show);
+
proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_fops);
proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_fops);
proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_fops);
@@ -601,6 +650,7 @@ cifs_proc_clean(void)
return;
remove_proc_entry("DebugData", proc_fs_cifs);
+ remove_proc_entry("open_files", proc_fs_cifs);
remove_proc_entry("cifsFYI", proc_fs_cifs);
remove_proc_entry("traceSMB", proc_fs_cifs);
remove_proc_entry("Stats", proc_fs_cifs);
@@ -1125,6 +1125,9 @@ struct cifs_fid {
__u8 create_guid[16];
struct cifs_pending_open *pending_open;
unsigned int epoch;
+#ifdef CONFIG_CIFS_DEBUG2
+ __u64 mid;
+#endif /* CIFS_DEBUG2 */
bool purge_cache;
};
@@ -1078,6 +1078,9 @@ smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
cfile->fid.persistent_fid = fid->persistent_fid;
cfile->fid.volatile_fid = fid->volatile_fid;
+#ifdef CONFIG_CIFS_DEBUG2
+ cfile->fid.mid = fid->mid;
+#endif /* CIFS_DEBUG2 */
server->ops->set_oplock_level(cinode, oplock, fid->epoch,
&fid->purge_cache);
cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
@@ -2306,6 +2306,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
atomic_inc(&tcon->num_remote_opens);
oparms->fid->persistent_fid = rsp->PersistentFileId;
oparms->fid->volatile_fid = rsp->VolatileFileId;
+#ifdef CONFIG_CIFS_DEBUG2
+ oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
+#endif /* CIFS_DEBUG2 */
if (buf) {
memcpy(buf, &rsp->CreationTime, 32);
--
2.17.1
In order to debug complex problems it is often helpful to have detailed information on the client and server view of the open file information. Add the ability for root to view the list of smb3 open files and dump the persistent handle and other info so that it can be more easily correlated with server logs. Sample output: Display debugging information for open files treeid: 0x8dce084 \\localhost\test Persistent fid: 0xaddde0a9 name: rofile flags 0x8000 count 1 pid: 7860 uid: 1000 mid 0x30 Persistent fid: 0xd634fe34 name: smallfile flags 0x8000 count 1 pid: 7858 uid: 1000 mid 0x24 Persistent fid: 0xc90bfdc9 name: smallfile flags 0x8000 count 1 pid: 7857 uid: 1000 mid 0x1a treeid: 0x34b9815b \\localhost\scratch Persistent fid: 0x86a6e394 name: f71 flags 0x8000 count 1 pid: 7861 uid: 1000 mid 0x20 Signed-off-by: Steve French <stfrench@microsoft.com> --- fs/cifs/cifs_debug.c | 50 ++++++++++++++++++++++++++++++++++++++++++++ fs/cifs/cifsglob.h | 3 +++ fs/cifs/smb2ops.c | 3 +++ fs/cifs/smb2pdu.c | 3 +++ 4 files changed, 59 insertions(+) memcpy(buf, &rsp->CreationTime, 32);