If the write is an async operation, send a 9p request and return
EIOCBQUEUED. Do not wait for completion.
Complete the write operation from a callback instead.
Signed-off-by: Stefano Stabellini <sstabell...@kernel.org>
---
net/9p/client.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 79 insertions(+), 1 deletion(-)
diff --git a/net/9p/client.c b/net/9p/client.c
index f9f09db..18942b7 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1719,6 +1719,61 @@ int p9_client_unlinkat(struct p9_fid *dfid, const char
*name, int flags)
}
EXPORT_SYMBOL(p9_client_read);
+static void
+p9_client_write_complete(struct p9_client *clnt, struct p9_req_t *req, int
status)
+{
+ int err, count;
+ struct file *file;
+ struct inode *inode;
+ unsigned long pg_start, pg_end;
+ loff_t i_size;
+
+ if (req->status == REQ_STATUS_ERROR) {
+ p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
+ err = req->t_err;
+ goto out;
+ }
+ err = p9_check_errors(clnt, req);
+ if (err)
+ goto out;
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
+ if (err) {
+ trace_9p_protocol_dump(clnt, req->rc);
+ goto out;
+ }
+ if (!count) {
+ p9_debug(P9_DEBUG_ERROR, "count=%d\n", count);
+ err = 0;
+ goto out;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
+
+ if (count > req->rsize)
+ count = req->rsize;
+
+ err = count;
+ file = req->kiocb->ki_filp;
+ inode = file_inode(file);
+ pg_start = req->kiocb->ki_pos >> PAGE_SHIFT;
+ pg_end = (req->kiocb->ki_pos + count - 1) >> PAGE_SHIFT;
+
+ if (inode->i_mapping && inode->i_mapping->nrpages)
+ invalidate_inode_pages2_range(inode->i_mapping,
+ pg_start, pg_end);
+ req->kiocb->ki_pos += count;
+ i_size = i_size_read(inode);
+ if (req->kiocb->ki_pos > i_size) {
+ inode_add_bytes(inode, req->kiocb->ki_pos - i_size);
+ i_size_write(inode, req->kiocb->ki_pos);
+ }
+out:
+ req->kiocb->ki_complete(req->kiocb, err, 0);
+
+ p9_free_req(clnt, req);
+}
+
int
p9_client_write(struct p9_fid *fid, struct kiocb *iocb, u64 offset,
struct iov_iter *from, int *err)
@@ -1746,9 +1801,32 @@ int p9_client_unlinkat(struct p9_fid *dfid, const char
*name, int flags)
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
rsize, P9_ZC_HDR_SZ, "dqd",
fid->fid, offset, rsize);
- } else {
+ /* sync request */
+ } else if(iocb == NULL || is_sync_kiocb(iocb)) {
req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
offset, rsize, from);
+ /* async request */
+ } else {
+ req = p9_client_get_req(clnt, P9_TWRITE, "dqV",
fid->fid,
+ offset, rsize, from);
+ if (IS_ERR(req)) {
+ *err = PTR_ERR(req);
+ break;
+ }
+ req->rsize = rsize;
+ req->kiocb = iocb;
+ req->callback = p9_client_write_complete;
+
+ *err = clnt->trans_mod->request(clnt, req);
+ if (*err < 0) {
+ clnt->status = Disconnected;
+ p9_free_req(clnt, req);
+ break;
+ }
+
+ iov_iter_advance(from, rsize);
+ *err = -EIOCBQUEUED;
+ break;
}
if (IS_ERR(req)) {
*err = PTR_ERR(req);
--
1.9.1
