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Diffstat (limited to 'fs/cifs/smb2pdu.c')
-rw-r--r--fs/cifs/smb2pdu.c108
1 files changed, 86 insertions, 22 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 27f86537a5d1..e283590955cd 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -50,6 +50,9 @@
#include "cifs_spnego.h"
#include "smbdirect.h"
#include "trace.h"
+#ifdef CONFIG_CIFS_DFS_UPCALL
+#include "dfs_cache.h"
+#endif
/*
* The following table defines the expected "StructureSize" of SMB2 requests
@@ -152,6 +155,77 @@ out:
return;
}
+#ifdef CONFIG_CIFS_DFS_UPCALL
+static int __smb2_reconnect(const struct nls_table *nlsc,
+ struct cifs_tcon *tcon)
+{
+ int rc;
+ struct dfs_cache_tgt_list tl;
+ struct dfs_cache_tgt_iterator *it = NULL;
+ char tree[MAX_TREE_SIZE + 1];
+ const char *tcp_host;
+ size_t tcp_host_len;
+ const char *dfs_host;
+ size_t dfs_host_len;
+
+ if (tcon->ipc) {
+ snprintf(tree, sizeof(tree), "\\\\%s\\IPC$",
+ tcon->ses->server->hostname);
+ return SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
+ }
+
+ if (!tcon->dfs_path)
+ return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
+
+ rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
+ if (rc)
+ return rc;
+
+ extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
+ &tcp_host_len);
+
+ for (it = dfs_cache_get_tgt_iterator(&tl); it;
+ it = dfs_cache_get_next_tgt(&tl, it)) {
+ const char *tgt = dfs_cache_get_tgt_name(it);
+
+ extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
+
+ if (dfs_host_len != tcp_host_len
+ || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
+ cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
+ __func__,
+ (int)dfs_host_len, dfs_host,
+ (int)tcp_host_len, tcp_host);
+ continue;
+ }
+
+ snprintf(tree, sizeof(tree), "\\%s", tgt);
+
+ rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
+ if (!rc)
+ break;
+ if (rc == -EREMOTE)
+ break;
+ }
+
+ if (!rc) {
+ if (it)
+ rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
+ it);
+ else
+ rc = -ENOENT;
+ }
+ dfs_cache_free_tgts(&tl);
+ return rc;
+}
+#else
+static inline int __smb2_reconnect(const struct nls_table *nlsc,
+ struct cifs_tcon *tcon)
+{
+ return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
+}
+#endif
+
static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
@@ -159,6 +233,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
struct nls_table *nls_codepage;
struct cifs_ses *ses;
struct TCP_Server_Info *server;
+ int retries;
/*
* SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
@@ -192,9 +267,12 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
ses = tcon->ses;
server = ses->server;
+ retries = server->nr_targets;
+
/*
- * Give demultiplex thread up to 10 seconds to reconnect, should be
- * greater than cifs socket timeout which is 7 seconds
+ * Give demultiplex thread up to 10 seconds to each target available for
+ * reconnect -- should be greater than cifs socket timeout which is 7
+ * seconds.
*/
while (server->tcpStatus == CifsNeedReconnect) {
/*
@@ -225,6 +303,9 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
if (server->tcpStatus != CifsNeedReconnect)
break;
+ if (--retries)
+ continue;
+
/*
* on "soft" mounts we wait once. Hard mounts keep
* retrying until process is killed or server comes
@@ -234,6 +315,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
return -EHOSTDOWN;
}
+ retries = server->nr_targets;
}
if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
@@ -271,7 +353,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
if (tcon->use_persistent)
tcon->need_reopen_files = true;
- rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
+ rc = __smb2_reconnect(nls_codepage, tcon);
mutex_unlock(&tcon->ses->session_mutex);
cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
@@ -1955,7 +2037,6 @@ int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
struct smb_rqst rqst;
struct smb2_create_req *req;
struct smb2_create_rsp *rsp = NULL;
- struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[3]; /* make sure at least one for each open context */
struct kvec rsp_iov = {NULL, 0};
@@ -1978,9 +2059,7 @@ int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
if (!utf16_path)
return -ENOMEM;
- if (ses && (ses->server))
- server = ses->server;
- else {
+ if (!ses || !(ses->server)) {
rc = -EIO;
goto err_free_path;
}
@@ -2768,18 +2847,6 @@ qinf_exit:
return rc;
}
-int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
- u64 persistent_fid, u64 volatile_fid,
- int ea_buf_size, struct smb2_file_full_ea_info *data)
-{
- return query_info(xid, tcon, persistent_fid, volatile_fid,
- FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
- ea_buf_size,
- sizeof(struct smb2_file_full_ea_info),
- (void **)&data,
- NULL);
-}
-
int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
{
@@ -3994,7 +4061,6 @@ static int
build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
int outbuf_len, u64 persistent_fid, u64 volatile_fid)
{
- struct TCP_Server_Info *server;
int rc;
struct smb2_query_info_req *req;
unsigned int total_len;
@@ -4004,8 +4070,6 @@ build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
return -EIO;
- server = tcon->ses->server;
-
rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
&total_len);
if (rc)