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authorPavel Shilovsky <pshilovsky@samba.org>2014-06-25 11:28:57 +0400
committerSteve French <smfrench@gmail.com>2014-08-02 01:23:03 -0500
commitbed9da0213f2174719b68012bd60735a11cfe244 (patch)
tree3a88a92dcf884d1a31a8896e9513a5124cbddebb /fs/cifs/smb2pdu.c
parente374d90f8a7693f24635bca9e5d56f3775bb36e2 (diff)
CIFS: Use multicredits for SMB 2.1/3 reads
If we negotiate SMB 2.1 and higher version of the protocol and a server supports large read buffer size, we need to consume 1 credit per 65536 bytes. So, we need to know how many credits we have and obtain the required number of them before constructing a readdata structure in readpages and user read. Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/smb2pdu.c')
-rw-r--r--fs/cifs/smb2pdu.c30
1 files changed, 27 insertions, 3 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index be7b2eb55134..c31e5a060338 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1747,11 +1747,12 @@ smb2_readv_callback(struct mid_q_entry *mid)
int
smb2_async_readv(struct cifs_readdata *rdata)
{
- int rc;
+ int rc, flags = 0;
struct smb2_hdr *buf;
struct cifs_io_parms io_parms;
struct smb_rqst rqst = { .rq_iov = &rdata->iov,
.rq_nvec = 1 };
+ struct TCP_Server_Info *server;
cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
__func__, rdata->offset, rdata->bytes);
@@ -1762,18 +1763,41 @@ smb2_async_readv(struct cifs_readdata *rdata)
io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
io_parms.pid = rdata->pid;
+
+ server = io_parms.tcon->ses->server;
+
rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
- if (rc)
+ if (rc) {
+ if (rc == -EAGAIN && rdata->credits) {
+ /* credits was reset by reconnect */
+ rdata->credits = 0;
+ /* reduce in_flight value since we won't send the req */
+ spin_lock(&server->req_lock);
+ server->in_flight--;
+ spin_unlock(&server->req_lock);
+ }
return rc;
+ }
buf = (struct smb2_hdr *)rdata->iov.iov_base;
/* 4 for rfc1002 length field */
rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
+ if (rdata->credits) {
+ buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
+ SMB2_MAX_BUFFER_SIZE));
+ spin_lock(&server->req_lock);
+ server->credits += rdata->credits -
+ le16_to_cpu(buf->CreditCharge);
+ spin_unlock(&server->req_lock);
+ wake_up(&server->request_q);
+ flags = CIFS_HAS_CREDITS;
+ }
+
kref_get(&rdata->refcount);
rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
cifs_readv_receive, smb2_readv_callback,
- rdata, 0);
+ rdata, flags);
if (rc) {
kref_put(&rdata->refcount, cifs_readdata_release);
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);