diff options
author | Shyam Prasad N <sprasad@microsoft.com> | 2021-03-31 17:35:24 +0300 |
---|---|---|
committer | Steve French <stfrench@microsoft.com> | 2021-04-08 05:29:36 +0300 |
commit | 4e456b30f78c429b183db420e23b26cde7e03a78 (patch) | |
tree | 9814bd639a5b7fe1cafa7d6f06ef7d45caa19bd8 | |
parent | e49d033bddf5b565044e2abe4241353959bc9120 (diff) | |
download | linux-4e456b30f78c429b183db420e23b26cde7e03a78.tar.xz |
cifs: On cifs_reconnect, resolve the hostname again.
On cifs_reconnect, make sure that DNS resolution happens again.
It could be the cause of connection to go dead in the first place.
This also contains the fix for a build issue identified by Intel bot.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: <stable@vger.kernel.org> # 5.11+
Signed-off-by: Steve French <stfrench@microsoft.com>
-rw-r--r-- | fs/cifs/Kconfig | 3 | ||||
-rw-r--r-- | fs/cifs/Makefile | 5 | ||||
-rw-r--r-- | fs/cifs/connect.c | 17 |
3 files changed, 20 insertions, 5 deletions
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig index fe03cbdae959..bf52e9326ebe 100644 --- a/fs/cifs/Kconfig +++ b/fs/cifs/Kconfig @@ -18,6 +18,7 @@ config CIFS select CRYPTO_AES select CRYPTO_LIB_DES select KEYS + select DNS_RESOLVER help This is the client VFS module for the SMB3 family of NAS protocols, (including support for the most recent, most secure dialect SMB3.1.1) @@ -112,7 +113,6 @@ config CIFS_WEAK_PW_HASH config CIFS_UPCALL bool "Kerberos/SPNEGO advanced session setup" depends on CIFS - select DNS_RESOLVER help Enables an upcall mechanism for CIFS which accesses userspace helper utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets @@ -179,7 +179,6 @@ config CIFS_DEBUG_DUMP_KEYS config CIFS_DFS_UPCALL bool "DFS feature support" depends on CIFS - select DNS_RESOLVER help Distributed File System (DFS) support is used to access shares transparently in an enterprise name space, even if the share diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile index 5213b20843b5..3ee3b7de4ded 100644 --- a/fs/cifs/Makefile +++ b/fs/cifs/Makefile @@ -10,13 +10,14 @@ cifs-y := trace.o cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o \ cifs_unicode.o nterr.o cifsencrypt.o \ readdir.o ioctl.o sess.o export.o smb1ops.o unc.o winucase.o \ smb2ops.o smb2maperror.o smb2transport.o \ - smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o + smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \ + dns_resolve.o cifs-$(CONFIG_CIFS_XATTR) += xattr.o cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o -cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o dfs_cache.o +cifs-$(CONFIG_CIFS_DFS_UPCALL) += cifs_dfs_ref.o dfs_cache.o cifs-$(CONFIG_CIFS_SWN_UPCALL) += netlink.o cifs_swn.o diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index eec8a2052da2..24668eb006c6 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -87,7 +87,6 @@ static void cifs_prune_tlinks(struct work_struct *work); * * This should be called with server->srv_mutex held. */ -#ifdef CONFIG_CIFS_DFS_UPCALL static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server) { int rc; @@ -124,6 +123,7 @@ static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server) return !rc ? -1 : 0; } +#ifdef CONFIG_CIFS_DFS_UPCALL /* These functions must be called with server->srv_mutex held */ static void reconn_set_next_dfs_target(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb, @@ -321,14 +321,29 @@ cifs_reconnect(struct TCP_Server_Info *server) #endif #ifdef CONFIG_CIFS_DFS_UPCALL + if (cifs_sb && cifs_sb->origin_fullpath) /* * Set up next DFS target server (if any) for reconnect. If DFS * feature is disabled, then we will retry last server we * connected to before. */ reconn_set_next_dfs_target(server, cifs_sb, &tgt_list, &tgt_it); + else { +#endif + /* + * Resolve the hostname again to make sure that IP address is up-to-date. + */ + rc = reconn_set_ipaddr_from_hostname(server); + if (rc) { + cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n", + __func__, rc); + } + +#ifdef CONFIG_CIFS_DFS_UPCALL + } #endif + #ifdef CONFIG_CIFS_SWN_UPCALL } #endif |