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3 small cifs/smb3 fixes, 2 to address minor coverity issues and one cleanup 

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Merge tag '5.16-rc1-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Three small cifs/smb3 fixes: two to address minor coverity issues and
  one cleanup"

* tag '5.16-rc1-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: introduce cifs_ses_mark_for_reconnect() helper
  cifs: protect srv_count with cifs_tcp_ses_lock
  cifs: move debug print out of spinlock
This commit is contained in:
Linus Torvalds 2021-11-20 10:47:16 -08:00
parent a90af8f15b 8ae87bbeb5
commit b38bfc747c
5 changed files with 21 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/cifs/cifs_swn.c
View File

@ -393,26 +393,14 @@ static void cifs_put_swn_reg(struct cifs_swn_reg *swnreg)
static int cifs_swn_resource_state_changed(struct cifs_swn_reg *swnreg, const char *name, int state)
{
int i;
switch (state) {
case CIFS_SWN_RESOURCE_STATE_UNAVAILABLE:
cifs_dbg(FYI, "%s: resource name '%s' become unavailable\n", __func__, name);
for (i = 0; i < swnreg->tcon->ses->chan_count; i++) {
spin_lock(&GlobalMid_Lock);
if (swnreg->tcon->ses->chans[i].server->tcpStatus != CifsExiting)
swnreg->tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
}
cifs_ses_mark_for_reconnect(swnreg->tcon->ses);
break;
case CIFS_SWN_RESOURCE_STATE_AVAILABLE:
cifs_dbg(FYI, "%s: resource name '%s' become available\n", __func__, name);
for (i = 0; i < swnreg->tcon->ses->chan_count; i++) {
spin_lock(&GlobalMid_Lock);
if (swnreg->tcon->ses->chans[i].server->tcpStatus != CifsExiting)
swnreg->tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
}
cifs_ses_mark_for_reconnect(swnreg->tcon->ses);
break;
case CIFS_SWN_RESOURCE_STATE_UNKNOWN:
cifs_dbg(FYI, "%s: resource name '%s' changed to unknown state\n", __func__, name);

1
fs/cifs/cifsproto.h
View File

@ -599,6 +599,7 @@ int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
bool is_server_using_iface(struct TCP_Server_Info *server,
struct cifs_server_iface *iface);
bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface);
void cifs_ses_mark_for_reconnect(struct cifs_ses *ses);
void extract_unc_hostname(const char *unc, const char **h, size_t *len);
int copy_path_name(char *dst, const char *src);

16
fs/cifs/connect.c
View File

@ -1452,8 +1452,10 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx,
tcp_ses->max_in_flight = 0;
tcp_ses->credits = 1;
if (primary_server) {
spin_lock(&cifs_tcp_ses_lock);
++primary_server->srv_count;
tcp_ses->primary_server = primary_server;
spin_unlock(&cifs_tcp_ses_lock);
}
init_waitqueue_head(&tcp_ses->response_q);
init_waitqueue_head(&tcp_ses->request_q);
@ -4111,18 +4113,6 @@ cifs_prune_tlinks(struct work_struct *work)
}
#ifdef CONFIG_CIFS_DFS_UPCALL
static void mark_tcon_tcp_ses_for_reconnect(struct cifs_tcon *tcon)
{
int i;
for (i = 0; i < tcon->ses->chan_count; i++) {
spin_lock(&GlobalMid_Lock);
if (tcon->ses->chans[i].server->tcpStatus != CifsExiting)
tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
}
}
/* Update dfs referral path of superblock */
static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb,
const char *target)
@ -4299,7 +4289,7 @@ static int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tco
*/
if (rc && server->current_fullpath != server->origin_fullpath) {
server->current_fullpath = server->origin_fullpath;
mark_tcon_tcp_ses_for_reconnect(tcon);
cifs_ses_mark_for_reconnect(tcon->ses);
}
dfs_cache_free_tgts(tl);

7
fs/cifs/dfs_cache.c
View File

@ -1355,12 +1355,7 @@ static void mark_for_reconnect_if_needed(struct cifs_tcon *tcon, struct dfs_cach
}
cifs_dbg(FYI, "%s: no cached or matched targets. mark dfs share for reconnect.\n", __func__);
for (i = 0; i < tcon->ses->chan_count; i++) {
spin_lock(&GlobalMid_Lock);
if (tcon->ses->chans[i].server->tcpStatus != CifsExiting)
tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
}
cifs_ses_mark_for_reconnect(tcon->ses);
}
/* Refresh dfs referral of tcon and mark it for reconnect if needed */

15
fs/cifs/sess.c
View File

@ -95,9 +95,9 @@ int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
}
if (!(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
ses->chan_max = 1;
spin_unlock(&ses->chan_lock);
cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
return 0;
}
spin_unlock(&ses->chan_lock);
@ -318,6 +318,19 @@ out:
return rc;
}
/* Mark all session channels for reconnect */
void cifs_ses_mark_for_reconnect(struct cifs_ses *ses)
{
int i;
for (i = 0; i < ses->chan_count; i++) {
spin_lock(&GlobalMid_Lock);
if (ses->chans[i].server->tcpStatus != CifsExiting)
ses->chans[i].server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
}
}
static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
{
__u32 capabilities = 0;