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| author |   Shyam Prasad N <sprasad@microsoft.com> | 2021-05-18 15:05:50 +0000 |
|---|---|---|
| committer |   Steve French <stfrench@microsoft.com> | 2021-07-14 10:06:03 -0500 |
| commit | 506c1da44fee32ba1d3a70413289ad58c772bba6 (patch) | |
| tree | 519eb1c02f57990884daec5513bdb6e62032585f /fs/cifs/cifsglob.h | |
| parent | Linux 5.14-rc1 (diff) | |
| download | linux-dev-506c1da44fee32ba1d3a70413289ad58c772bba6.tar.xz linux-dev-506c1da44fee32ba1d3a70413289ad58c772bba6.zip | |
cifs: use the expiry output of dns_query to schedule next resolution
We recently fixed DNS resolution of the server hostname during reconnect.
However, server IP address may change, even when the old one continues
to server (although sub-optimally).
We should schedule the next DNS resolution based on the TTL of
the DNS record used for the last resolution. This way, we resolve the
server hostname again when a DNS record expires.
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Cc: <stable@vger.kernel.org> # v5.11+
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/cifsglob.h')
| -rw-r--r-- | fs/cifs/cifsglob.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 3c2e117bb926..ade7080f7eaa 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -75,6 +75,9 @@ #define SMB_ECHO_INTERVAL_MAX 600 #define SMB_ECHO_INTERVAL_DEFAULT 60 +/* dns resolution interval in seconds */ +#define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600 + /* maximum number of PDUs in one compound */ #define MAX_COMPOUND 5 @@ -646,6 +649,7 @@ struct TCP_Server_Info { /* point to the SMBD connection if RDMA is used instead of socket */ struct smbd_connection *smbd_conn; struct delayed_work echo; /* echo ping workqueue job */ + struct delayed_work resolve; /* dns resolution workqueue job */ char *smallbuf; /* pointer to current "small" buffer */ char *bigbuf; /* pointer to current "big" buffer */ /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ |