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authorSteve French <stfrench@microsoft.com>2018-10-30 19:50:31 -0500
committerSteve French <stfrench@microsoft.com>2018-11-02 14:09:41 -0500
commitdfe33f9abc08997e56f9bdf14fe9ac7ac0e14075 (patch)
tree2a065362ea2a958e4c62637720dc5ad656819318 /fs/cifs
parent926674de6705f0f1dbf29a62fd758d0977f535d6 (diff)
downloadlinux-dfe33f9abc08997e56f9bdf14fe9ac7ac0e14075.tar.bz2
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 from "cat /proc/fs/cifs/open_files" # Version:1 # Format: # <tree id> <persistent fid> <flags> <count> <pid> <uid> <filename> <mid> 0x5 0x800000378 0x8000 1 7704 0 some-file 0x14 0xcb903c0c 0x84412e67 0x8000 1 7754 1001 rofile 0x1a6d 0xcb903c0c 0x9526b767 0x8000 1 7720 1000 file 0x1a5b 0xcb903c0c 0x9ce41a21 0x8000 1 7715 0 smallfile 0xd67 Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifs_debug.c56
-rw-r--r--fs/cifs/cifsglob.h3
-rw-r--r--fs/cifs/smb2ops.c3
-rw-r--r--fs/cifs/smb2pdu.c3
4 files changed, 65 insertions, 0 deletions
diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 3e812428ac8d..ba178b09de0b 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -145,6 +145,58 @@ 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, "# Version:1\n");
+ seq_puts(m, "# Format:\n");
+ seq_puts(m, "# <tree id> <persistent fid> <flags> <count> <pid> <uid>");
+#ifdef CONFIG_CIFS_DEBUG2
+ seq_printf(m, " <filename> <mid>\n");
+#else
+ seq_printf(m, " <filename>\n");
+#endif /* CIFS_DEBUG2 */
+ 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);
+ spin_lock(&tcon->open_file_lock);
+ list_for_each(tmp2, &tcon->openFileList) {
+ cfile = list_entry(tmp2, struct cifsFileInfo,
+ tlist);
+ seq_printf(m,
+ "0x%x 0x%llx 0x%x %d %d %d %s",
+ tcon->tid,
+ cfile->fid.persistent_fid,
+ cfile->f_flags,
+ cfile->count,
+ cfile->pid,
+ from_kuid(&init_user_ns, cfile->uid),
+ cfile->dentry->d_name.name);
+#ifdef CONFIG_CIFS_DEBUG2
+ seq_printf(m, " 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 +617,9 @@ 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 +656,7 @@ 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);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index ed1e0fcb69e3..d7c0443d47a4 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -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;
};
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 8489b5f706c3..225fec1cfa67 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1079,6 +1079,9 @@ 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);
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index a92d3840db9d..27f86537a5d1 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2309,6 +2309,9 @@ 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);