| 42 | #include <vm/vm_map.h> |
| 43 | |
| 44 | int |
| 45 | physio(struct cdev *dev, struct uio *uio, int ioflag) |
| 46 | { |
| 47 | struct cdevsw *csw; |
| 48 | struct buf *pbuf; |
| 49 | struct bio *bp; |
| 50 | struct vm_page **pages; |
| 51 | char *base, *sa; |
| 52 | u_int iolen, poff; |
| 53 | int error, i, npages, maxpages; |
| 54 | vm_prot_t prot; |
| 55 | |
| 56 | csw = dev->si_devsw; |
| 57 | npages = 0; |
| 58 | sa = NULL; |
| 59 | /* check if character device is being destroyed */ |
| 60 | if (csw == NULL) |
| 61 | return (ENXIO); |
| 62 | |
| 63 | /* XXX: sanity check */ |
| 64 | if(dev->si_iosize_max < PAGE_SIZE) { |
| 65 | printf("WARNING: %s si_iosize_max=%d, using DFLTPHYS.\n", |
| 66 | devtoname(dev), dev->si_iosize_max); |
| 67 | dev->si_iosize_max = DFLTPHYS; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * If the driver does not want I/O to be split, that means that we |
| 72 | * need to reject any requests that will not fit into one buffer. |
| 73 | */ |
| 74 | if (dev->si_flags & SI_NOSPLIT && |
| 75 | (uio->uio_resid > dev->si_iosize_max || uio->uio_resid > maxphys || |
| 76 | uio->uio_iovcnt > 1)) { |
| 77 | /* |
| 78 | * Tell the user why his I/O was rejected. |
| 79 | */ |
| 80 | if (uio->uio_resid > dev->si_iosize_max) |
| 81 | uprintf("%s: request size=%zd > si_iosize_max=%d; " |
| 82 | "cannot split request\n", devtoname(dev), |
| 83 | uio->uio_resid, dev->si_iosize_max); |
| 84 | if (uio->uio_resid > maxphys) |
| 85 | uprintf("%s: request size=%zd > maxphys=%lu; " |
| 86 | "cannot split request\n", devtoname(dev), |
| 87 | uio->uio_resid, maxphys); |
| 88 | if (uio->uio_iovcnt > 1) |
| 89 | uprintf("%s: request vectors=%d > 1; " |
| 90 | "cannot split request\n", devtoname(dev), |
| 91 | uio->uio_iovcnt); |
| 92 | return (EFBIG); |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Keep the process UPAGES from being swapped. Processes swapped |
| 97 | * out while holding pbufs, used by swapper, may lead to deadlock. |
| 98 | */ |
| 99 | PHOLD(curproc); |
| 100 | |
| 101 | bp = g_alloc_bio(); |
nothing calls this directly
no test coverage detected