@@ -33,6 +33,7 @@
#define P9_CMD_WALK 110
#define P9_CMD_OPEN 112
#define P9_CMD_CREATE 114
+#define P9_CMD_READ 116
#define P9_CMD_WRITE 118
#define P9_CMD_CLUNK 120
#define P9_CMD_STAT 124
@@ -1123,6 +1124,65 @@ static void p9_create(struct ring *ring, struct p9_header *hdr)
free_fid(device, fidp);
}
+static void p9_read(struct ring *ring, struct p9_header *hdr)
+{
+ device *device = ring->device;
+ uint32_t fid;
+ uint64_t off;
+ unsigned int len;
+ uint32_t count;
+ void *buf;
+ struct p9_fid *fidp;
+ int ret;
+
+ ret = fill_data(ring, "ULU", &fid, &off, &count);
+ if ( ret != 3 )
+ {
+ p9_error(ring, hdr->tag, EINVAL);
+ return;
+ }
+
+ fidp = get_fid_ref(device, fid);
+ if ( !fidp || !fidp->opened )
+ {
+ p9_error(ring, hdr->tag, EBADF);
+ goto out;
+ }
+
+ if ( fidp->isdir )
+ {
+ p9_error(ring, hdr->tag, EOPNOTSUPP);
+ goto out;
+ }
+ else
+ {
+ len = count;
+ buf = ring->buffer + sizeof(*hdr) + sizeof(uint32_t);
+
+ while ( len != 0 )
+ {
+ ret = pread(fidp->fd, buf, len, off);
+ if ( ret <= 0 )
+ break;
+ len -= ret;
+ buf += ret;
+ off += ret;
+ }
+ if ( ret < 0 && len == count )
+ {
+ p9_error(ring, hdr->tag, errno);
+ goto out;
+ }
+
+ buf = ring->buffer + sizeof(*hdr) + sizeof(uint32_t);
+ len = count - len;
+ fill_buffer(ring, hdr->cmd + 1, hdr->tag, "D", &len, buf);
+ }
+
+ out:
+ free_fid(device, fidp);
+}
+
static void p9_write(struct ring *ring, struct p9_header *hdr)
{
device *device = ring->device;
@@ -1354,6 +1414,10 @@ void *io_thread(void *arg)
p9_create(ring, &hdr);
break;
+ case P9_CMD_READ:
+ p9_read(ring, &hdr);
+ break;
+
case P9_CMD_WRITE:
p9_write(ring, &hdr);
break;