cifs: replace kvec array in readdata with a single kvec

The array is no longer needed. We just need a single kvec to hold the
header for signature checking.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

4 files changed, 21 insertions, 32 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 93e16200b2e8..79e8b6f06021 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -981,10 +981,9 @@ struct cifs_readdata {
         int (*read_into_pages)(struct TCP_Server_Info *server,
                                 struct cifs_readdata *rdata,
                                 unsigned int len);
+        struct kvec                     iov;
         unsigned int                    pagesz;
         unsigned int                    tailsz;
-        unsigned int                    nr_iov;
-        struct kvec                     *iov;
         unsigned int                    nr_pages;
         struct page                     *pages[];
 };
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 5d7bd757dcf1..88bbb3ef95b3 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1436,10 +1436,10 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
         len = min_t(unsigned int, buflen, server->vals->read_rsp_size) -
                                                         HEADER_SIZE(server) + 1;
 
-        rdata->iov[0].iov_base = buf + HEADER_SIZE(server) - 1;
-        rdata->iov[0].iov_len = len;
+        rdata->iov.iov_base = buf + HEADER_SIZE(server) - 1;
+        rdata->iov.iov_len = len;
 
-        length = cifs_readv_from_socket(server, rdata->iov, 1, len);
+        length = cifs_readv_from_socket(server, &rdata->iov, 1, len);
         if (length < 0)
                 return length;
         server->total_read += length;
@@ -1485,20 +1485,19 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
         len = data_offset - server->total_read;
         if (len > 0) {
                 /* read any junk before data into the rest of smallbuf */
-                rdata->iov[0].iov_base = buf + server->total_read;
-                rdata->iov[0].iov_len = len;
-                length = cifs_readv_from_socket(server, rdata->iov, 1, len);
+                rdata->iov.iov_base = buf + server->total_read;
+                rdata->iov.iov_len = len;
+                length = cifs_readv_from_socket(server, &rdata->iov, 1, len);
                 if (length < 0)
                         return length;
                 server->total_read += length;
         }
 
         /* set up first iov for signature check */
-        rdata->iov[0].iov_base = buf;
-        rdata->iov[0].iov_len = server->total_read;
-        rdata->nr_iov = 1;
+        rdata->iov.iov_base = buf;
+        rdata->iov.iov_len = server->total_read;
         cFYI(1, "0: iov_base=%p iov_len=%zu",
-                rdata->iov[0].iov_base, rdata->iov[0].iov_len);
+                rdata->iov.iov_base, rdata->iov.iov_len);
 
         /* how much data is in the response? */
         data_len = server->ops->read_data_length(buf);
@@ -1532,8 +1531,8 @@ cifs_readv_callback(struct mid_q_entry *mid)
         struct cifs_readdata *rdata = mid->callback_data;
         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
         struct TCP_Server_Info *server = tcon->ses->server;
-        struct smb_rqst rqst = { .rq_iov = rdata->iov,
-                                 .rq_nvec = rdata->nr_iov,
+        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
+                                 .rq_nvec = 1,
                                  .rq_pages = rdata->pages,
                                  .rq_npages = rdata->nr_pages,
                                  .rq_pagesz = rdata->pagesz,
@@ -1580,7 +1579,7 @@ cifs_async_readv(struct cifs_readdata *rdata)
         READ_REQ *smb = NULL;
         int wct;
         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
-        struct smb_rqst rqst = { .rq_iov = rdata->iov,
+        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
                                  .rq_nvec = 1 };
 
         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
@@ -1621,8 +1620,8 @@ cifs_async_readv(struct cifs_readdata *rdata)
         }
 
         /* 4 for RFC1001 length + 1 for BCC */
-        rdata->iov[0].iov_base = smb;
-        rdata->iov[0].iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
+        rdata->iov.iov_base = smb;
+        rdata->iov.iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
 
         kref_get(&rdata->refcount);
         rc = cifs_call_async(tcon->ses->server, &rqst, cifs_readv_receive,
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index f3f1b1098a6c..2421ec28df14 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2413,11 +2413,6 @@ static struct cifs_readdata *
 cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
 {
         struct cifs_readdata *rdata;
-        struct kvec *iov;
-
-        iov = kzalloc(sizeof(*iov) * (nr_pages + 1), GFP_KERNEL);
-        if (!iov)
-                return (struct cifs_readdata *)iov;
 
         rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages),
                         GFP_KERNEL);
@@ -2426,9 +2421,6 @@ cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
                 INIT_LIST_HEAD(&rdata->list);
                 init_completion(&rdata->done);
                 INIT_WORK(&rdata->work, complete);
-                rdata->iov = iov;
-        } else {
-                kfree(iov);
         }
 
         return rdata;
@@ -2443,7 +2435,6 @@ cifs_readdata_release(struct kref *refcount)
         if (rdata->cfile)
                 cifsFileInfo_put(rdata->cfile);
 
-        kfree(rdata->iov);
         kfree(rdata);
 }
 
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index e3efa47cd6ec..1b447612200e 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1297,9 +1297,9 @@ smb2_readv_callback(struct mid_q_entry *mid)
         struct cifs_readdata *rdata = mid->callback_data;
         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
         struct TCP_Server_Info *server = tcon->ses->server;
-        struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov[0].iov_base;
+        struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
         unsigned int credits_received = 1;
-        struct smb_rqst rqst = { .rq_iov = rdata->iov,
+        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
                                  .rq_nvec = 1,
                                  .rq_pages = rdata->pages,
                                  .rq_npages = rdata->nr_pages,
@@ -1350,7 +1350,7 @@ smb2_async_readv(struct cifs_readdata *rdata)
         int rc;
         struct smb2_hdr *buf;
         struct cifs_io_parms io_parms;
-        struct smb_rqst rqst = { .rq_iov = rdata->iov,
+        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
                                  .rq_nvec = 1 };
 
         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
@@ -1362,13 +1362,13 @@ 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;
-        rc = smb2_new_read_req(&rdata->iov[0], &io_parms, 0, 0);
+        rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
         if (rc)
                 return rc;
 
-        buf = (struct smb2_hdr *)rdata->iov[0].iov_base;
+        buf = (struct smb2_hdr *)rdata->iov.iov_base;
         /* 4 for rfc1002 length field */
-        rdata->iov[0].iov_len = get_rfc1002_length(rdata->iov[0].iov_base) + 4;
+        rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
 
         kref_get(&rdata->refcount);
         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,