static void v9fs_read(void *opaque) { int32_t fid; int64_t off; ssize_t err = 0; int32_t count = 0; size_t offset = 7; int32_t max_count; V9fsFidState *fidp; V9fsPDU *pdu = opaque; V9fsState *s = pdu->s; pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); fidp = get_fid(pdu, fid); if (fidp == NULL) { err = -EINVAL; goto out_nofid; } if (fidp->fid_type == P9_FID_DIR) { if (off == 0) { v9fs_co_rewinddir(pdu, fidp); } count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); if (count < 0) { err = count; goto out; } err = offset; err += pdu_marshal(pdu, offset, "d", count); err += count; } else if (fidp->fid_type == P9_FID_FILE) { int32_t cnt; int32_t len; struct iovec *sg; struct iovec iov[128]; /* FIXME: bad, bad, bad */ sg = iov; pdu_marshal(pdu, offset + 4, "v", sg, &cnt); sg = cap_sg(sg, max_count, &cnt); do { if (0) { print_sg(sg, cnt); } /* Loop in case of EINTR */ do { len = v9fs_co_preadv(pdu, fidp, sg, cnt, off); if (len >= 0) { off += len; count += len; } } while (len == -EINTR && !pdu->cancelled); if (len < 0) { /* IO error return the error */ err = len; goto out; } sg = adjust_sg(sg, len, &cnt); } while (count < max_count && len > 0); err = offset; err += pdu_marshal(pdu, offset, "d", count); err += count; } else if (fidp->fid_type == P9_FID_XATTR) { err = v9fs_xattr_read(s, pdu, fidp, off, max_count); } else { err = -EINVAL; } out: put_fid(pdu, fidp); out_nofid: trace_v9fs_read_return(pdu->tag, pdu->id, count, err); complete_pdu(s, pdu, err); }