void
puffs_senderr(struct puffs_mount *pmp, int type, int error,
const char *str, puffs_cookie_t ck)
{
struct puffs_msgpark *park;
struct puffs_error *perr;
puffs_msgmem_alloc(sizeof(struct puffs_error), &park, (void *)&perr, 1);
puffs_msg_setfaf(park);
puffs_msg_setinfo(park, PUFFSOP_ERROR, type, ck);
perr->perr_error = error;
strlcpy(perr->perr_str, str, sizeof(perr->perr_str));
puffs_msg_enqueue(pmp, park);
puffs_msgmem_release(park);
}
int
puffs_directwrite(struct vnode *vp, struct uio *uio, int ioflag,
struct ucred *cred)
{
PUFFS_MSG_VARS(vn, write);
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
size_t tomove, argsize;
int error, uflags;
KKASSERT(vp->v_type == VREG);
if (uio->uio_offset < 0)
return EINVAL;
if (uio->uio_resid == 0)
return 0;
error = uflags = 0;
write_msg = NULL;
/* tomove is non-increasing */
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
argsize = sizeof(struct puffs_vnmsg_write) + tomove;
puffs_msgmem_alloc(argsize, &park_write, (void *)&write_msg,1);
while (uio->uio_resid > 0) {
/* move data to buffer */
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
memset(write_msg, 0, argsize); /* XXX: touser KASSERT */
RWARGS(write_msg, ioflag, tomove,
uio->uio_offset, cred);
error = uiomove(write_msg->pvnr_data, tomove, uio);
if (error)
break;
/* move buffer to userspace */
puffs_msg_setinfo(park_write, PUFFSOP_VN,
PUFFS_VN_WRITE, VPTOPNC(vp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_write, vp->v_data,
NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
break;
if (write_msg->pvnr_resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_WRITE,
E2BIG, "resid grew", VPTOPNC(vp));
error = EPROTO;
break;
}
if (PUFFS_USE_PAGECACHE(pmp))
KKASSERT(vp->v_filesize >= uio->uio_offset);
/* didn't move everything? bad userspace. bail */
if (write_msg->pvnr_resid != 0) {
error = EIO;
break;
}
}
puffs_msgmem_release(park_write);
return error;
}
int
puffs_directread(struct vnode *vp, struct uio *uio, int ioflag,
struct ucred *cred)
{
PUFFS_MSG_VARS(vn, read);
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
size_t tomove, argsize;
int error;
KKASSERT(vp->v_type == VREG);
if (uio->uio_offset < 0)
return EINVAL;
if (uio->uio_resid == 0)
return 0;
read_msg = NULL;
error = 0;
/* std sanity */
if (uio->uio_resid == 0)
return 0;
if (uio->uio_offset < 0)
return EINVAL;
/*
* in case it's not a regular file or we're operating
* uncached, do read in the old-fashioned style,
* i.e. explicit read operations
*/
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
argsize = sizeof(struct puffs_vnmsg_read);
puffs_msgmem_alloc(argsize + tomove, &park_read,
(void *)&read_msg, 1);
error = 0;
while (uio->uio_resid > 0) {
tomove = PUFFS_TOMOVE(uio->uio_resid, pmp);
memset(read_msg, 0, argsize); /* XXX: touser KASSERT */
RWARGS(read_msg, ioflag, tomove,
uio->uio_offset, cred);
puffs_msg_setinfo(park_read, PUFFSOP_VN,
PUFFS_VN_READ, VPTOPNC(vp));
puffs_msg_setdelta(park_read, tomove);
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_read, vp->v_data,
NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
break;
if (read_msg->pvnr_resid > tomove) {
puffs_senderr(pmp, PUFFS_ERR_READ,
E2BIG, "resid grew", VPTOPNC(vp));
error = EPROTO;
break;
}
error = uiomove(read_msg->pvnr_data,
tomove - read_msg->pvnr_resid, uio);
/*
* in case the file is out of juice, resid from
* userspace is != 0. and the error-case is
* quite obvious
*/
if (error || read_msg->pvnr_resid)
break;
}
puffs_msgmem_release(park_read);
return error;
}
static int
puffs_vnop_readdir(struct vop_readdir_args *ap)
{
PUFFS_MSG_VARS(vn, readdir);
struct vnode *vp = ap->a_vp;
struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
size_t argsize, tomove, cookiemem, cookiesmax;
struct uio *uio = ap->a_uio;
size_t howmuch, resid;
int error;
if (!EXISTSOP(pmp, READDIR))
return EOPNOTSUPP;
/*
* ok, so we need: resid + cookiemem = maxreq
* => resid + cookiesize * (resid/minsize) = maxreq
* => resid + cookiesize/minsize * resid = maxreq
* => (cookiesize/minsize + 1) * resid = maxreq
* => resid = maxreq / (cookiesize/minsize + 1)
*
* Since cookiesize <= minsize and we're not very big on floats,
* we approximate that to be 1. Therefore:
*
* resid = maxreq / 2;
*
* Well, at least we didn't have to use differential equations
* or the Gram-Schmidt process.
*
* (yes, I'm very afraid of this)
*/
KKASSERT(CSIZE <= _DIRENT_RECLEN(1));
if (ap->a_cookies) {
KKASSERT(ap->a_ncookies != NULL);
if (pmp->pmp_args.pa_fhsize == 0)
return EOPNOTSUPP;
resid = PUFFS_TOMOVE(uio->uio_resid, pmp) / 2;
cookiesmax = resid/_DIRENT_RECLEN(1);
cookiemem = ALIGN(cookiesmax*CSIZE); /* play safe */
} else {
resid = PUFFS_TOMOVE(uio->uio_resid, pmp);
cookiesmax = 0;
cookiemem = 0;
}
argsize = sizeof(struct puffs_vnmsg_readdir);
tomove = resid + cookiemem;
puffs_msgmem_alloc(argsize + tomove, &park_readdir,
(void *)&readdir_msg, 1);
puffs_credcvt(&readdir_msg->pvnr_cred, ap->a_cred);
readdir_msg->pvnr_offset = uio->uio_offset;
readdir_msg->pvnr_resid = resid;
readdir_msg->pvnr_ncookies = cookiesmax;
readdir_msg->pvnr_eofflag = 0;
readdir_msg->pvnr_dentoff = cookiemem;
puffs_msg_setinfo(park_readdir, PUFFSOP_VN,
PUFFS_VN_READDIR, VPTOPNC(vp));
puffs_msg_setdelta(park_readdir, tomove);
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_readdir, vp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
/* userspace is cheating? */
if (readdir_msg->pvnr_resid > resid) {
puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG,
"resid grew", VPTOPNC(vp));
ERROUT(EPROTO);
}
if (readdir_msg->pvnr_ncookies > cookiesmax) {
puffs_senderr(pmp, PUFFS_ERR_READDIR, E2BIG,
"too many cookies", VPTOPNC(vp));
ERROUT(EPROTO);
}
/* check eof */
if (readdir_msg->pvnr_eofflag)
*ap->a_eofflag = 1;
/* bouncy-wouncy with the directory data */
howmuch = resid - readdir_msg->pvnr_resid;
/* force eof if no data was returned (getcwd() needs this) */
if (howmuch == 0) {
*ap->a_eofflag = 1;
goto out;
}
error = uiomove(readdir_msg->pvnr_data + cookiemem, howmuch, uio);
if (error)
goto out;
/* provide cookies to caller if so desired */
if (ap->a_cookies) {
*ap->a_cookies = kmalloc(readdir_msg->pvnr_ncookies*CSIZE,
M_TEMP, M_WAITOK);
*ap->a_ncookies = readdir_msg->pvnr_ncookies;
memcpy(*ap->a_cookies, readdir_msg->pvnr_data,
*ap->a_ncookies*CSIZE);
}
/* next readdir starts here */
uio->uio_offset = readdir_msg->pvnr_offset;
out:
puffs_msgmem_release(park_readdir);
return error;
}
