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Diffstat (limited to 'fs/cifs/smb2ops.c')
-rw-r--r--fs/cifs/smb2ops.c115
1 files changed, 98 insertions, 17 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 6f96e2292856..085e91436da7 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -67,10 +67,13 @@ change_conf(struct TCP_Server_Info *server)
}
static void
-smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
- const int optype)
+smb2_add_credits(struct TCP_Server_Info *server,
+ const struct cifs_credits *credits, const int optype)
{
int *val, rc = -1;
+ unsigned int add = credits->value;
+ unsigned int instance = credits->instance;
+ bool reconnect_detected = false;
spin_lock(&server->req_lock);
val = server->ops->get_credits_field(server, optype);
@@ -79,8 +82,11 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
server->hostname, *val);
+ if ((instance == 0) || (instance == server->reconnect_instance))
+ *val += add;
+ else
+ reconnect_detected = true;
- *val += add;
if (*val > 65000) {
*val = 65000; /* Don't get near 64K credits, avoid srv bugs */
printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
@@ -102,7 +108,12 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
- if (server->tcpStatus == CifsNeedReconnect)
+ if (reconnect_detected)
+ cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
+ add, instance);
+
+ if (server->tcpStatus == CifsNeedReconnect
+ || server->tcpStatus == CifsExiting)
return;
switch (rc) {
@@ -163,7 +174,7 @@ smb2_get_credits(struct mid_q_entry *mid)
static int
smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
- unsigned int *num, unsigned int *credits)
+ unsigned int *num, struct cifs_credits *credits)
{
int rc = 0;
unsigned int scredits;
@@ -189,7 +200,8 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
/* can deadlock with reopen */
if (scredits <= 8) {
*num = SMB2_MAX_BUFFER_SIZE;
- *credits = 0;
+ credits->value = 0;
+ credits->instance = 0;
break;
}
@@ -198,8 +210,10 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
*num = min_t(unsigned int, size,
scredits * SMB2_MAX_BUFFER_SIZE);
- *credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
- server->credits -= *credits;
+ credits->value =
+ DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
+ credits->instance = server->reconnect_instance;
+ server->credits -= credits->value;
server->in_flight++;
break;
}
@@ -208,6 +222,38 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
return rc;
}
+static int
+smb2_adjust_credits(struct TCP_Server_Info *server,
+ struct cifs_credits *credits,
+ const unsigned int payload_size)
+{
+ int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
+
+ if (!credits->value || credits->value == new_val)
+ return 0;
+
+ if (credits->value < new_val) {
+ WARN_ONCE(1, "request has less credits (%d) than required (%d)",
+ credits->value, new_val);
+ return -ENOTSUPP;
+ }
+
+ spin_lock(&server->req_lock);
+
+ if (server->reconnect_instance != credits->instance) {
+ spin_unlock(&server->req_lock);
+ cifs_dbg(VFS, "trying to return %d credits to old session\n",
+ credits->value - new_val);
+ return -EAGAIN;
+ }
+
+ server->credits += credits->value - new_val;
+ spin_unlock(&server->req_lock);
+ wake_up(&server->request_q);
+ credits->value = new_val;
+ return 0;
+}
+
static __u64
smb2_get_next_mid(struct TCP_Server_Info *server)
{
@@ -219,6 +265,15 @@ smb2_get_next_mid(struct TCP_Server_Info *server)
return mid;
}
+static void
+smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
+{
+ spin_lock(&GlobalMid_Lock);
+ if (server->CurrentMid >= val)
+ server->CurrentMid -= val;
+ spin_unlock(&GlobalMid_Lock);
+}
+
static struct mid_q_entry *
smb2_find_mid(struct TCP_Server_Info *server, char *buf)
{
@@ -940,6 +995,16 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
memset(rsp_iov, 0, sizeof(rsp_iov));
+ if (ses->server->ops->query_all_EAs) {
+ if (!ea_value) {
+ rc = ses->server->ops->query_all_EAs(xid, tcon, path,
+ ea_name, NULL, 0,
+ cifs_sb);
+ if (rc == -ENODATA)
+ goto sea_exit;
+ }
+ }
+
/* Open */
memset(&open_iov, 0, sizeof(open_iov));
rqst[0].rq_iov = open_iov;
@@ -1753,14 +1818,14 @@ smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
* the number of credits and return true. Otherwise - return false.
*/
static bool
-smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
+smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
{
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
if (shdr->Status != STATUS_PENDING)
return false;
- if (!length) {
+ if (shdr->CreditRequest) {
spin_lock(&server->req_lock);
server->credits += le16_to_cpu(shdr->CreditRequest);
spin_unlock(&server->req_lock);
@@ -2595,6 +2660,15 @@ smb2_downgrade_oplock(struct TCP_Server_Info *server,
}
static void
+smb21_downgrade_oplock(struct TCP_Server_Info *server,
+ struct cifsInodeInfo *cinode, bool set_level2)
+{
+ server->ops->set_oplock_level(cinode,
+ set_level2 ? SMB2_LEASE_READ_CACHING_HE :
+ 0, 0, NULL);
+}
+
+static void
smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
unsigned int epoch, bool *purge_cache)
{
@@ -3210,15 +3284,15 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
}
if (server->ops->is_status_pending &&
- server->ops->is_status_pending(buf, server, 0))
+ server->ops->is_status_pending(buf, server))
return -1;
/* 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[0].iov_len = 0;
+ rdata->iov[1].iov_base = buf;
rdata->iov[1].iov_len =
- min_t(unsigned int, buf_len, server->vals->read_rsp_size) - 4;
+ min_t(unsigned int, buf_len, server->vals->read_rsp_size);
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",
@@ -3541,6 +3615,7 @@ struct smb_version_operations smb20_operations = {
.get_credits = smb2_get_credits,
.wait_mtu_credits = cifs_wait_mtu_credits,
.get_next_mid = smb2_get_next_mid,
+ .revert_current_mid = smb2_revert_current_mid,
.read_data_offset = smb2_read_data_offset,
.read_data_length = smb2_read_data_length,
.map_error = map_smb2_to_linux_error,
@@ -3635,7 +3710,9 @@ struct smb_version_operations smb21_operations = {
.get_credits_field = smb2_get_credits_field,
.get_credits = smb2_get_credits,
.wait_mtu_credits = smb2_wait_mtu_credits,
+ .adjust_credits = smb2_adjust_credits,
.get_next_mid = smb2_get_next_mid,
+ .revert_current_mid = smb2_revert_current_mid,
.read_data_offset = smb2_read_data_offset,
.read_data_length = smb2_read_data_length,
.map_error = map_smb2_to_linux_error,
@@ -3646,7 +3723,7 @@ struct smb_version_operations smb21_operations = {
.print_stats = smb2_print_stats,
.is_oplock_break = smb2_is_valid_oplock_break,
.handle_cancelled_mid = smb2_handle_cancelled_mid,
- .downgrade_oplock = smb2_downgrade_oplock,
+ .downgrade_oplock = smb21_downgrade_oplock,
.need_neg = smb2_need_neg,
.negotiate = smb2_negotiate,
.negotiate_wsize = smb2_negotiate_wsize,
@@ -3731,7 +3808,9 @@ struct smb_version_operations smb30_operations = {
.get_credits_field = smb2_get_credits_field,
.get_credits = smb2_get_credits,
.wait_mtu_credits = smb2_wait_mtu_credits,
+ .adjust_credits = smb2_adjust_credits,
.get_next_mid = smb2_get_next_mid,
+ .revert_current_mid = smb2_revert_current_mid,
.read_data_offset = smb2_read_data_offset,
.read_data_length = smb2_read_data_length,
.map_error = map_smb2_to_linux_error,
@@ -3743,7 +3822,7 @@ struct smb_version_operations smb30_operations = {
.dump_share_caps = smb2_dump_share_caps,
.is_oplock_break = smb2_is_valid_oplock_break,
.handle_cancelled_mid = smb2_handle_cancelled_mid,
- .downgrade_oplock = smb2_downgrade_oplock,
+ .downgrade_oplock = smb21_downgrade_oplock,
.need_neg = smb2_need_neg,
.negotiate = smb2_negotiate,
.negotiate_wsize = smb3_negotiate_wsize,
@@ -3836,7 +3915,9 @@ struct smb_version_operations smb311_operations = {
.get_credits_field = smb2_get_credits_field,
.get_credits = smb2_get_credits,
.wait_mtu_credits = smb2_wait_mtu_credits,
+ .adjust_credits = smb2_adjust_credits,
.get_next_mid = smb2_get_next_mid,
+ .revert_current_mid = smb2_revert_current_mid,
.read_data_offset = smb2_read_data_offset,
.read_data_length = smb2_read_data_length,
.map_error = map_smb2_to_linux_error,
@@ -3848,7 +3929,7 @@ struct smb_version_operations smb311_operations = {
.dump_share_caps = smb2_dump_share_caps,
.is_oplock_break = smb2_is_valid_oplock_break,
.handle_cancelled_mid = smb2_handle_cancelled_mid,
- .downgrade_oplock = smb2_downgrade_oplock,
+ .downgrade_oplock = smb21_downgrade_oplock,
.need_neg = smb2_need_neg,
.negotiate = smb2_negotiate,
.negotiate_wsize = smb3_negotiate_wsize,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.