/*
* Called for write. Hand off to DEVOP_IO.
*/
static
int
dev_write(struct vnode *v, struct uio *uio)
{
struct device *d = v->vn_data;
int result;
result = dev_tryseek(d, uio->uio_offset);
if (result) {
return result;
}
KASSERT(uio->uio_rw == UIO_WRITE);
return DEVOP_IO(d, uio);
}
/*
* Read or write a block, retrying I/O errors.
*/
static
int
sfs_rwblock(struct sfs_fs *sfs, struct uio *uio)
{
int result;
int tries=0;
DEBUG(DB_SFS, "sfs: %s %llu\n",
uio->uio_rw == UIO_READ ? "read" : "write",
uio->uio_offset / SFS_BLOCKSIZE);
retry:
result = DEVOP_IO(sfs->sfs_device, uio);
if (result == EINVAL) {
/*
* This means the sector we requested was out of range,
* or the seek address we gave wasn't sector-aligned,
* or a couple of other things that are our fault.
*/
panic("sfs: DEVOP_IO returned EINVAL\n");
}
if (result == EIO) {
if (tries == 0) {
tries++;
kprintf("sfs: block %llu I/O error, retrying\n",
uio->uio_offset / SFS_BLOCKSIZE);
goto retry;
}
else if (tries < 10) {
tries++;
goto retry;
}
else {
kprintf("sfs: block %llu I/O error, giving up after "
"%d retries\n",
uio->uio_offset / SFS_BLOCKSIZE, tries);
}
}
return result;
}