#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <net/9p/client.h>
*/
static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
- char *uidata, int in_hdrlen, int kern_buf)
+ struct iov_iter *uidata, int in_hdrlen)
{
int err;
int ecode;
ename = &req->rc->sdata[req->rc->offset];
if (len > inline_len) {
/* We have error in external buffer */
- if (kern_buf) {
- memcpy(ename + inline_len, uidata,
- len - inline_len);
- } else {
- err = copy_from_user(ename + inline_len,
- uidata, len - inline_len);
- if (err) {
- err = -EFAULT;
- goto out_err;
- }
+ err = copy_from_iter(ename + inline_len,
+ len - inline_len, uidata);
+ if (err != len - inline_len) {
+ err = -EFAULT;
+ goto out_err;
}
}
ename = NULL;
* p9_client_zc_rpc - issue a request and wait for a response
* @c: client session
* @type: type of request
- * @uidata: user bffer that should be ued for zero copy read
- * @uodata: user buffer that shoud be user for zero copy write
+ * @uidata: destination for zero copy read
+ * @uodata: source for zero copy write
* @inlen: read buffer size
* @olen: write buffer size
* @hdrlen: reader header size, This is the size of response protocol data
* Returns request structure (which client must free using p9_free_req)
*/
static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
- char *uidata, char *uodata,
+ struct iov_iter *uidata,
+ struct iov_iter *uodata,
int inlen, int olen, int in_hdrlen,
- int kern_buf, const char *fmt, ...)
+ const char *fmt, ...)
{
va_list ap;
int sigpending, err;
} else
sigpending = 0;
- /* If we are called with KERNEL_DS force kern_buf */
- if (segment_eq(get_fs(), KERNEL_DS))
- kern_buf = 1;
-
err = c->trans_mod->zc_request(c, req, uidata, uodata,
- inlen, olen, in_hdrlen, kern_buf);
+ inlen, olen, in_hdrlen);
if (err < 0) {
if (err == -EIO)
c->status = Disconnected;
if (err < 0)
goto reterr;
- err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
+ err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
trace_9p_client_res(c, type, req->rc->tag, err);
if (!err)
return req;
fid = NULL;
goto error;
}
+ fid->uid = n_uname;
req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
EXPORT_SYMBOL(p9_client_unlinkat);
int
-p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
- u32 count)
+p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
{
- char *dataptr;
- int kernel_buf = 0;
+ struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
- struct p9_client *clnt;
- int err, rsize, non_zc = 0;
-
+ int total = 0;
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
- fid->fid, (unsigned long long) offset, count);
- err = 0;
- clnt = fid->clnt;
-
- rsize = fid->iounit;
- if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
- rsize = clnt->msize - P9_IOHDRSZ;
-
- if (count < rsize)
- rsize = count;
-
- /* Don't bother zerocopy for small IO (< 1024) */
- if (clnt->trans_mod->zc_request && rsize > 1024) {
- char *indata;
- if (data) {
- kernel_buf = 1;
- indata = data;
- } else
- indata = (__force char *)udata;
- /*
- * response header len is 11
- * PDU Header(7) + IO Size (4)
- */
- req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
- 11, kernel_buf, "dqd", fid->fid,
- offset, rsize);
- } else {
- non_zc = 1;
- req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
- rsize);
- }
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto error;
- }
+ fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
+
+ while (iov_iter_count(to)) {
+ int count = iov_iter_count(to);
+ int rsize, non_zc = 0;
+ char *dataptr;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ if (count < rsize)
+ rsize = count;
+
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && rsize > 1024) {
+ /*
+ * response header len is 11
+ * PDU Header(7) + IO Size (4)
+ */
+ req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
+ 0, 11, "dqd", fid->fid,
+ offset, rsize);
+ } else {
+ non_zc = 1;
+ req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
+ rsize);
+ }
+ if (IS_ERR(req)) {
+ *err = PTR_ERR(req);
+ break;
+ }
- err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
- if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
- goto free_and_error;
- }
+ *err = p9pdu_readf(req->rc, clnt->proto_version,
+ "D", &count, &dataptr);
+ if (*err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ p9_free_req(clnt, req);
+ break;
+ }
- p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
+ p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
+ if (!count) {
+ p9_free_req(clnt, req);
+ break;
+ }
- if (non_zc) {
- if (data) {
- memmove(data, dataptr, count);
- } else {
- err = copy_to_user(udata, dataptr, count);
- if (err) {
- err = -EFAULT;
- goto free_and_error;
+ if (non_zc) {
+ int n = copy_to_iter(dataptr, count, to);
+ total += n;
+ offset += n;
+ if (n != count) {
+ *err = -EFAULT;
+ p9_free_req(clnt, req);
+ break;
}
+ } else {
+ iov_iter_advance(to, count);
+ total += count;
+ offset += count;
}
+ p9_free_req(clnt, req);
}
- p9_free_req(clnt, req);
- return count;
-
-free_and_error:
- p9_free_req(clnt, req);
-error:
- return err;
+ return total;
}
EXPORT_SYMBOL(p9_client_read);
int
-p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
- u64 offset, u32 count)
+p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
{
- int err, rsize;
- int kernel_buf = 0;
- struct p9_client *clnt;
+ struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
+ int total = 0;
+
+ p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
+ fid->fid, (unsigned long long) offset,
+ iov_iter_count(from));
+
+ while (iov_iter_count(from)) {
+ int count = iov_iter_count(from);
+ int rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ if (count < rsize)
+ rsize = count;
+
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && rsize > 1024) {
+ req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
+ rsize, P9_ZC_HDR_SZ, "dqd",
+ fid->fid, offset, rsize);
+ } else {
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
+ offset, rsize, from);
+ }
+ if (IS_ERR(req)) {
+ *err = PTR_ERR(req);
+ break;
+ }
- p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
- fid->fid, (unsigned long long) offset, count);
- err = 0;
- clnt = fid->clnt;
-
- rsize = fid->iounit;
- if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
- rsize = clnt->msize - P9_IOHDRSZ;
+ *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
+ if (*err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ p9_free_req(clnt, req);
+ }
- if (count < rsize)
- rsize = count;
+ p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
- /* Don't bother zerocopy for small IO (< 1024) */
- if (clnt->trans_mod->zc_request && rsize > 1024) {
- char *odata;
- if (data) {
- kernel_buf = 1;
- odata = data;
- } else
- odata = (char *)udata;
- req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
- P9_ZC_HDR_SZ, kernel_buf, "dqd",
- fid->fid, offset, rsize);
- } else {
- if (data)
- req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
- offset, rsize, data);
- else
- req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
- offset, rsize, udata);
- }
- if (IS_ERR(req)) {
- err = PTR_ERR(req);
- goto error;
- }
-
- err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
- if (err) {
- trace_9p_protocol_dump(clnt, req->rc);
- goto free_and_error;
+ p9_free_req(clnt, req);
+ iov_iter_advance(from, count);
+ total += count;
+ offset += count;
}
-
- p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
-
- p9_free_req(clnt, req);
- return count;
-
-free_and_error:
- p9_free_req(clnt, req);
-error:
- return err;
+ return total;
}
EXPORT_SYMBOL(p9_client_write);
struct p9_client *clnt;
struct p9_req_t *req;
char *dataptr;
+ struct kvec kv = {.iov_base = data, .iov_len = count};
+ struct iov_iter to;
+
+ iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
fid->fid, (unsigned long long) offset, count);
* response header len is 11
* PDU Header(7) + IO Size (4)
*/
- req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
- 11, 1, "dqd", fid->fid, offset, rsize);
+ req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
+ 11, "dqd", fid->fid, offset, rsize);
} else {
non_zc = 1;
req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
projects / firefly-linux-kernel-4.4.55.git / blobdiff