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CIFS: Optimize cifs_user_read() in a short read case on reconnects

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by filling the output buffer with a data got from a partially received
response and requesting the remaining data from the server. This is
suitable for non-signed connections.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2014-07-10 11:31:48 +04:00 committed by Steve French
parent fb8a3e5255
commit d913ed17f0
3 changed files with 32 additions and 3 deletions
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6
fs/cifs/cifssmb.c
View file

@ -1561,6 +1561,12 @@ cifs_readv_callback(struct mid_q_entry *mid)
case MID_REQUEST_SUBMITTED:
case MID_RETRY_NEEDED:
rdata->result = -EAGAIN;
if (server->sign && rdata->got_bytes)
/* reset bytes number since we can not check a sign */
rdata->got_bytes = 0;
/* FIXME: should this be counted toward the initiating task? */
task_io_account_read(rdata->got_bytes);
cifs_stats_bytes_read(tcon, rdata->got_bytes);
break;
default:
rdata->result = -EIO;

23
fs/cifs/file.c
View file

@ -3030,13 +3030,30 @@ again:
else if (rdata->result == -EAGAIN) {
/* resend call if it's a retryable error */
struct list_head tmp_list;
unsigned int got_bytes = rdata->got_bytes;
list_del_init(&rdata->list);
INIT_LIST_HEAD(&tmp_list);
rc = cifs_send_async_read(rdata->offset,
rdata->bytes, rdata->cfile,
cifs_sb, &tmp_list);
/*
* Got a part of data and then reconnect has
* happened -- fill the buffer and continue
* reading.
*/
if (got_bytes && got_bytes < rdata->bytes) {
rc = cifs_readdata_to_iov(rdata, to);
if (rc) {
kref_put(&rdata->refcount,
cifs_uncached_readdata_release);
continue;
}
}
rc = cifs_send_async_read(
rdata->offset + got_bytes,
rdata->bytes - got_bytes,
rdata->cfile, cifs_sb,
&tmp_list);
list_splice(&tmp_list, &rdata_list);

6
fs/cifs/smb2pdu.c
View file

@ -1729,6 +1729,12 @@ smb2_readv_callback(struct mid_q_entry *mid)
case MID_REQUEST_SUBMITTED:
case MID_RETRY_NEEDED:
rdata->result = -EAGAIN;
if (server->sign && rdata->got_bytes)
/* reset bytes number since we can not check a sign */
rdata->got_bytes = 0;
/* FIXME: should this be counted toward the initiating task? */
task_io_account_read(rdata->got_bytes);
cifs_stats_bytes_read(tcon, rdata->got_bytes);
break;
default:
if (rdata->result != -ENODATA)