[CIFS] Add writepages support to shrink memory usage on writes,
eliminate the double copy, and improve cifs write performance and
help the server by upping the typical write size from 4K to 16K
(or even larger if wsize set explicitly) for servers which support this.
Part 1 of 2
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 3766db2..9411083 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -849,13 +849,19 @@
/* BB FIXME We can not sign across two buffers yet */
if((experimEnabled) && ((pTcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) == 0)) {
+ struct kvec iov[2];
+ unsigned int len;
+
+ len = min(cifs_sb->wsize,
+ write_size - total_written);
+ /* iov[0] is reserved for smb header */
+ iov[1].iov_base = (char *)write_data +
+ total_written;
+ iov[1].iov_len = len;
rc = CIFSSMBWrite2(xid, pTcon,
- open_file->netfid,
- min_t(const int, cifs_sb->wsize,
- write_size - total_written),
+ open_file->netfid, len,
*poffset, &bytes_written,
- write_data + total_written,
- long_op);
+ iov, 1, long_op);
} else
/* BB FIXME fixup indentation of line below */
#endif