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a set of small smb3 fixes, some fixing various crediting issues discovered during xfstest runs, five for stable 

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Merge tag '5.0-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb3 fixes from Steve French:
 "A set of small smb3 fixes, some fixing various crediting issues
  discovered during xfstest runs, five for stable"

* tag '5.0-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: print CIFSMaxBufSize as part of /proc/fs/cifs/DebugData
  smb3: add credits we receive from oplock/break PDUs
  CIFS: Fix mounts if the client is low on credits
  CIFS: Do not assume one credit for async responses
  CIFS: Fix credit calculations in compound mid callback
  CIFS: Fix credit calculation for encrypted reads with errors
  CIFS: Fix credits calculations for reads with errors
  CIFS: Do not reconnect TCP session in add_credits()
  smb3: Cleanup license mess
  CIFS: Fix possible hang during async MTU reads and writes
  cifs: fix memory leak of an allocated cifs_ntsd structure
This commit is contained in:
Linus Torvalds 2019-01-26 15:38:22 -08:00
parent 2580acb2a1 a5f1a81f70
commit 7c2614bf7a
10 changed files with 136 additions and 67 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/cifs/cifs_debug.c
View File

@ -252,6 +252,7 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
seq_printf(m, ",ACL");
#endif
seq_putc(m, '\n');
seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
seq_printf(m, "Servers:");

35
fs/cifs/cifssmb.c
View File

@ -1549,18 +1549,26 @@ cifs_discard_remaining_data(struct TCP_Server_Info *server)
}
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
__cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid,
bool malformed)
{
int length;
struct cifs_readdata *rdata = mid->callback_data;
length = cifs_discard_remaining_data(server);
dequeue_mid(mid, rdata->result);
dequeue_mid(mid, malformed);
mid->resp_buf = server->smallbuf;
server->smallbuf = NULL;
return length;
}
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
struct cifs_readdata *rdata = mid->callback_data;
return __cifs_readv_discard(server, mid, rdata->result);
}
int
cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
@ -1602,12 +1610,23 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
return -1;
}
/* set up first two iov for signature check and to get credits */
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = 4;
rdata->iov[1].iov_base = buf + 4;
rdata->iov[1].iov_len = server->total_read - 4;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
rdata->iov[1].iov_base, rdata->iov[1].iov_len);
/* Was the SMB read successful? */
rdata->result = server->ops->map_error(buf, false);
if (rdata->result != 0) {
cifs_dbg(FYI, "%s: server returned error %d\n",
__func__, rdata->result);
return cifs_readv_discard(server, mid);
/* normal error on read response */
return __cifs_readv_discard(server, mid, false);
}
/* Is there enough to get to the rest of the READ_RSP header? */
@ -1651,14 +1670,6 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
server->total_read += length;
}
/* set up first iov for signature check */
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = 4;
rdata->iov[1].iov_base = buf + 4;
rdata->iov[1].iov_len = server->total_read - 4;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%u\n",
rdata->iov[0].iov_base, server->total_read);
/* how much data is in the response? */
#ifdef CONFIG_CIFS_SMB_DIRECT
use_rdma_mr = rdata->mr;

21
fs/cifs/connect.c
View File

@ -720,6 +720,21 @@ server_unresponsive(struct TCP_Server_Info *server)
return false;
}
static inline bool
zero_credits(struct TCP_Server_Info *server)
{
int val;
spin_lock(&server->req_lock);
val = server->credits + server->echo_credits + server->oplock_credits;
if (server->in_flight == 0 && val == 0) {
spin_unlock(&server->req_lock);
return true;
}
spin_unlock(&server->req_lock);
return false;
}
static int
cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
{
@ -732,6 +747,12 @@ cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
try_to_freeze();
/* reconnect if no credits and no requests in flight */
if (zero_credits(server)) {
cifs_reconnect(server);
return -ECONNABORTED;
}
if (server_unresponsive(server))
return -ECONNABORTED;
if (cifs_rdma_enabled(server) && server->smbd_conn)

17
fs/cifs/smb2inode.c
View File

@ -293,6 +293,8 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
int rc;
struct smb2_file_all_info *smb2_data;
__u32 create_options = 0;
struct cifs_fid fid;
bool no_cached_open = tcon->nohandlecache;
*adjust_tz = false;
*symlink = false;
@ -301,6 +303,21 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
GFP_KERNEL);
if (smb2_data == NULL)
return -ENOMEM;
/* If it is a root and its handle is cached then use it */
if (!strlen(full_path) && !no_cached_open) {
rc = open_shroot(xid, tcon, &fid);
if (rc)
goto out;
rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
fid.volatile_fid, smb2_data);
close_shroot(&tcon->crfid);
if (rc)
goto out;
move_smb2_info_to_cifs(data, smb2_data);
goto out;
}
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;

7
fs/cifs/smb2misc.c
View File

@ -648,6 +648,13 @@ smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
return false;
if (rsp->sync_hdr.CreditRequest) {
spin_lock(&server->req_lock);
server->credits += le16_to_cpu(rsp->sync_hdr.CreditRequest);
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
}
if (rsp->StructureSize !=
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
if (le16_to_cpu(rsp->StructureSize) == 44)

68
fs/cifs/smb2ops.c
View File

@ -34,6 +34,7 @@
#include "cifs_ioctl.h"
#include "smbdirect.h"
/* Change credits for different ops and return the total number of credits */
static int
change_conf(struct TCP_Server_Info *server)
{
@ -41,17 +42,15 @@ change_conf(struct TCP_Server_Info *server)
server->oplock_credits = server->echo_credits = 0;
switch (server->credits) {
case 0:
return -1;
return 0;
case 1:
server->echoes = false;
server->oplocks = false;
cifs_dbg(VFS, "disabling echoes and oplocks\n");
break;
case 2:
server->echoes = true;
server->oplocks = false;
server->echo_credits = 1;
cifs_dbg(FYI, "disabling oplocks\n");
break;
default:
server->echoes = true;
@ -64,14 +63,15 @@ change_conf(struct TCP_Server_Info *server)
server->echo_credits = 1;
}
server->credits -= server->echo_credits + server->oplock_credits;
return 0;
return server->credits + server->echo_credits + server->oplock_credits;
}
static void
smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
const int optype)
{
int *val, rc = 0;
int *val, rc = -1;
spin_lock(&server->req_lock);
val = server->ops->get_credits_field(server, optype);
@ -101,8 +101,26 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
}
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
if (rc)
cifs_reconnect(server);
if (server->tcpStatus == CifsNeedReconnect)
return;
switch (rc) {
case -1:
/* change_conf hasn't been executed */
break;
case 0:
cifs_dbg(VFS, "Possible client or server bug - zero credits\n");
break;
case 1:
cifs_dbg(VFS, "disabling echoes and oplocks\n");
break;
case 2:
cifs_dbg(FYI, "disabling oplocks\n");
break;
default:
cifs_dbg(FYI, "add %u credits total=%d\n", add, rc);
}
}
static void
@ -136,7 +154,11 @@ smb2_get_credits(struct mid_q_entry *mid)
{
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
return le16_to_cpu(shdr->CreditRequest);
if (mid->mid_state == MID_RESPONSE_RECEIVED
|| mid->mid_state == MID_RESPONSE_MALFORMED)
return le16_to_cpu(shdr->CreditRequest);
return 0;
}
static int
@ -165,14 +187,14 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
scredits = server->credits;
/* can deadlock with reopen */
if (scredits == 1) {
if (scredits <= 8) {
*num = SMB2_MAX_BUFFER_SIZE;
*credits = 0;
break;
}
/* leave one credit for a possible reopen */
scredits--;
/* leave some credits for reopen and other ops */
scredits -= 8;
*num = min_t(unsigned int, size,
scredits * SMB2_MAX_BUFFER_SIZE);
@ -3189,11 +3211,23 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
server->ops->is_status_pending(buf, server, 0))
return -1;
rdata->result = server->ops->map_error(buf, false);
/* set up first two iov to get credits */
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = 4;
rdata->iov[1].iov_base = buf + 4;
rdata->iov[1].iov_len =
min_t(unsigned int, buf_len, server->vals->read_rsp_size) - 4;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
rdata->iov[1].iov_base, rdata->iov[1].iov_len);
rdata->result = server->ops->map_error(buf, true);
if (rdata->result != 0) {
cifs_dbg(FYI, "%s: server returned error %d\n",
__func__, rdata->result);
dequeue_mid(mid, rdata->result);
/* normal error on read response */
dequeue_mid(mid, false);
return 0;
}
@ -3266,14 +3300,6 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
return 0;
}
/* set up first iov for signature check */
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = 4;
rdata->iov[1].iov_base = buf + 4;
rdata->iov[1].iov_len = server->vals->read_rsp_size - 4;
cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
rdata->iov[0].iov_base, server->vals->read_rsp_size);
length = rdata->copy_into_pages(server, rdata, &iter);
kfree(bvec);

23
fs/cifs/smb2pdu.c
View File

@ -2816,6 +2816,7 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon,
int resp_buftype = CIFS_NO_BUFFER;
struct cifs_ses *ses = tcon->ses;
int flags = 0;
bool allocated = false;
cifs_dbg(FYI, "Query Info\n");
@ -2855,14 +2856,21 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon,
"Error %d allocating memory for acl\n",
rc);
*dlen = 0;
rc = -ENOMEM;
goto qinf_exit;
}
allocated = true;
}
}
rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength),
&rsp_iov, min_len, *data);
if (rc && allocated) {
kfree(*data);
*data = NULL;
*dlen = 0;
}
qinf_exit:
SMB2_query_info_free(&rqst);
@ -2916,9 +2924,10 @@ smb2_echo_callback(struct mid_q_entry *mid)
{
struct TCP_Server_Info *server = mid->callback_data;
struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
unsigned int credits_received = 1;
unsigned int credits_received = 0;
if (mid->mid_state == MID_RESPONSE_RECEIVED)
if (mid->mid_state == MID_RESPONSE_RECEIVED
|| mid->mid_state == MID_RESPONSE_MALFORMED)
credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
DeleteMidQEntry(mid);
@ -3175,7 +3184,7 @@ smb2_readv_callback(struct mid_q_entry *mid)
struct TCP_Server_Info *server = tcon->ses->server;
struct smb2_sync_hdr *shdr =
(struct smb2_sync_hdr *)rdata->iov[0].iov_base;
unsigned int credits_received = 1;
unsigned int credits_received = 0;
struct smb_rqst rqst = { .rq_iov = rdata->iov,
.rq_nvec = 2,
.rq_pages = rdata->pages,
@ -3214,6 +3223,9 @@ smb2_readv_callback(struct mid_q_entry *mid)
task_io_account_read(rdata->got_bytes);
cifs_stats_bytes_read(tcon, rdata->got_bytes);
break;
case MID_RESPONSE_MALFORMED:
credits_received = le16_to_cpu(shdr->CreditRequest);
/* fall through */
default:
if (rdata->result != -ENODATA)
rdata->result = -EIO;
@ -3399,7 +3411,7 @@ smb2_writev_callback(struct mid_q_entry *mid)
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
unsigned int written;
struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
unsigned int credits_received = 1;
unsigned int credits_received = 0;
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
@ -3427,6 +3439,9 @@ smb2_writev_callback(struct mid_q_entry *mid)
case MID_RETRY_NEEDED:
wdata->result = -EAGAIN;
break;
case MID_RESPONSE_MALFORMED:
credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
/* fall through */
default:
wdata->result = -EIO;
break;

10
fs/cifs/trace.c
View File

@ -3,16 +3,6 @@
* Copyright (C) 2018, Microsoft Corporation.
*
* Author(s): Steve French <stfrench@microsoft.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
#define CREATE_TRACE_POINTS
#include "trace.h"

10
fs/cifs/trace.h
View File

@ -3,16 +3,6 @@
* Copyright (C) 2018, Microsoft Corporation.
*
* Author(s): Steve French <stfrench@microsoft.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM cifs

11
fs/cifs/transport.c
View File

@ -786,17 +786,8 @@ static void
cifs_compound_callback(struct mid_q_entry *mid)
{
struct TCP_Server_Info *server = mid->server;
unsigned int optype = mid->optype;
unsigned int credits_received = 0;
if (mid->mid_state == MID_RESPONSE_RECEIVED) {
if (mid->resp_buf)
credits_received = server->ops->get_credits(mid);
else
cifs_dbg(FYI, "Bad state for cancelled MID\n");
}
add_credits(server, credits_received, optype);
add_credits(server, server->ops->get_credits(mid), mid->optype);
}
static void