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cifs: Send witness register messages to userspace daemon in echo task 

If the daemon starts after mounting a share, or if it crashes, this
provides a mechanism to register again.

Signed-off-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
zero-sugar-mainline-defconfig
Samuel Cabrero 2020-11-30 19:02:54 +01:00 committed by Steve French
parent 20fab0da2f
commit 21077c62e1
3 changed files with 22 additions and 0 deletions
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15
fs/cifs/cifs_swn.c
View File

@ -540,3 +540,18 @@ void cifs_swn_dump(struct seq_file *m)
mutex_unlock(&cifs_swnreg_idr_mutex);
seq_puts(m, "\n");
}
void cifs_swn_check(void)
{
struct cifs_swn_reg *swnreg;
int id;
int ret;
mutex_lock(&cifs_swnreg_idr_mutex);
idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
ret = cifs_swn_send_register_message(swnreg);
if (ret < 0)
cifs_dbg(FYI, "%s: Failed to send register message: %d\n", __func__, ret);
}
mutex_unlock(&cifs_swnreg_idr_mutex);
}

2
fs/cifs/cifs_swn.h
View File

@ -20,4 +20,6 @@ extern int cifs_swn_notify(struct sk_buff *skb, struct genl_info *info);
extern void cifs_swn_dump(struct seq_file *m);
extern void cifs_swn_check(void);
#endif /* _CIFS_SWN_H */

5
fs/cifs/connect.c
View File

@ -405,6 +405,11 @@ cifs_echo_request(struct work_struct *work)
cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
server->hostname);
#ifdef CONFIG_CIFS_SWN_UPCALL
/* Check witness registrations */
cifs_swn_check();
#endif
requeue_echo:
queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
}