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authorJeff Layton <jlayton@redhat.com>2011-10-19 15:29:05 -0400
committerJeff Layton <jlayton@redhat.com>2011-10-19 15:29:05 -0400
commitea1f4502fc939b64807f9ab0eca259321047fe83 (patch)
treed572678f31748fa8e4012747008cad6e892b3f9f /fs/cifs
parent89482a56a079f01c2f4c709f8e23fbf7eeda1b43 (diff)
cifs: move mid finding into separate routine
Begin breaking up find_cifs_mid into smaller pieces. The parts that coalesce T2 responses don't really need to be done under the GlobalMid_lock anyway. Create a new function that just finds the mid on the list, and then later takes it off the list if the entire response has been received. Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/connect.c113
1 files changed, 66 insertions, 47 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5308bc6e124..0f69b311d3f 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -542,61 +542,80 @@ is_smb_response(struct TCP_Server_Info *server, unsigned char type)
}
static struct mid_q_entry *
-find_cifs_mid(struct TCP_Server_Info *server, struct smb_hdr *buf,
- int *length, bool is_large_buf, bool *is_multi_rsp, char **bigbuf)
+find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf)
{
- struct mid_q_entry *mid = NULL, *tmp_mid, *ret = NULL;
+ struct mid_q_entry *mid;
spin_lock(&GlobalMid_Lock);
- list_for_each_entry_safe(mid, tmp_mid, &server->pending_mid_q, qhead) {
- if (mid->mid != buf->Mid ||
- mid->midState != MID_REQUEST_SUBMITTED ||
- mid->command != buf->Command)
- continue;
-
- if (*length == 0 && check2ndT2(buf) > 0) {
- /* We have a multipart transact2 resp */
- *is_multi_rsp = true;
- if (mid->resp_buf) {
- /* merge response - fix up 1st*/
- *length = coalesce_t2(buf, mid->resp_buf);
- if (*length > 0) {
- *length = 0;
- mid->multiRsp = true;
- break;
- }
- /* All parts received or packet is malformed. */
- mid->multiEnd = true;
- goto multi_t2_fnd;
- }
- if (!is_large_buf) {
- /*FIXME: switch to already allocated largebuf?*/
- cERROR(1, "1st trans2 resp needs bigbuf");
- } else {
- /* Have first buffer */
- mid->resp_buf = buf;
- mid->largeBuf = true;
- *bigbuf = NULL;
- }
- break;
+ list_for_each_entry(mid, &server->pending_mid_q, qhead) {
+ if (mid->mid == buf->Mid &&
+ mid->midState == MID_REQUEST_SUBMITTED &&
+ mid->command == buf->Command) {
+ spin_unlock(&GlobalMid_Lock);
+ return mid;
}
- mid->resp_buf = buf;
- mid->largeBuf = is_large_buf;
-multi_t2_fnd:
- if (*length == 0)
- mid->midState = MID_RESPONSE_RECEIVED;
- else
- mid->midState = MID_RESPONSE_MALFORMED;
+ }
+ spin_unlock(&GlobalMid_Lock);
+ return NULL;
+}
+
+static void
+dequeue_mid(struct mid_q_entry *mid, int malformed)
+{
#ifdef CONFIG_CIFS_STATS2
- mid->when_received = jiffies;
+ mid->when_received = jiffies;
#endif
- list_del_init(&mid->qhead);
- ret = mid;
- break;
- }
+ spin_lock(&GlobalMid_Lock);
+ if (!malformed)
+ mid->midState = MID_RESPONSE_RECEIVED;
+ else
+ mid->midState = MID_RESPONSE_MALFORMED;
+ list_del_init(&mid->qhead);
spin_unlock(&GlobalMid_Lock);
+}
- return ret;
+static struct mid_q_entry *
+find_cifs_mid(struct TCP_Server_Info *server, struct smb_hdr *buf,
+ int *malformed, bool is_large_buf, bool *is_multi_rsp,
+ char **bigbuf)
+{
+ struct mid_q_entry *mid = NULL;
+
+ mid = find_mid(server, buf);
+ if (!mid)
+ return mid;
+
+ if (*malformed == 0 && check2ndT2(buf) > 0) {
+ /* We have a multipart transact2 resp */
+ *is_multi_rsp = true;
+ if (mid->resp_buf) {
+ /* merge response - fix up 1st*/
+ *malformed = coalesce_t2(buf, mid->resp_buf);
+ if (*malformed > 0) {
+ *malformed = 0;
+ mid->multiRsp = true;
+ return NULL;
+ }
+ /* All parts received or packet is malformed. */
+ mid->multiEnd = true;
+ goto multi_t2_fnd;
+ }
+ if (!is_large_buf) {
+ /*FIXME: switch to already allocated largebuf?*/
+ cERROR(1, "1st trans2 resp needs bigbuf");
+ } else {
+ /* Have first buffer */
+ mid->resp_buf = buf;
+ mid->largeBuf = true;
+ *bigbuf = NULL;
+ }
+ return mid;
+ }
+ mid->resp_buf = buf;
+ mid->largeBuf = is_large_buf;
+multi_t2_fnd:
+ dequeue_mid(mid, *malformed);
+ return mid;
}
static void clean_demultiplex_info(struct TCP_Server_Info *server)