static Spfcall*
ufs_read(Spfid *fid, u64 offset, u32 count, Spreq *req)
{
int n;
Fid *f;
Spfcall *ret;
f = fid->aux;
ret = sp_alloc_rread(count);
if (f->dir)
n = ufs_read_dir(fid, ret->data, offset, count, fid->conn->dotu);
else {
n = pread(f->fd, ret->data, count, offset);
if (n < 0)
create_rerror(errno);
}
if (sp_haserror()) {
free(ret);
ret = NULL;
} else
sp_set_rread_count(ret, n);
return ret;
}
static Spfcall*
npfs_read(Spfid *fid, u64 offset, u32 count, Spreq *req)
{
int n;
Fid *f;
Spfcall *ret;
f = fid->aux;
ret = sp_alloc_rread(count);
npfs_change_user(fid->user);
if (f->dir)
n = npfs_read_dir(f, ret->data, offset, count, fid->conn->dotu);
else {
if(mmapreads) {
struct stat s;
n = count;
if(!f->aux) {
fstat(f->fd, &s);
f->aux=mmap(0, s.st_size, PROT_READ,
MAP_SHARED, f->fd, 0);
if(f->aux < 0) {
create_rerror(errno);
goto error;
}
}
if(offset+count > s.st_size)
n = s.st_size-offset;
if(n>0)
memcpy(ret->data, f->aux+offset, n);
else
n = 0;
} else {
n = pread(f->fd, ret->data, count, offset);
if (n < 0)
create_rerror(errno);
}
}
error:
if (sp_haserror()) {
free(ret);
ret = NULL;
} else
sp_set_rread_count(ret, n);
return ret;
}
Spfcall *
sp_read(Spreq *req, Spfcall *tc)
{
int n;
Spconn *conn;
Spfid *fid;
Spfcall *rc;
rc = NULL;
conn = req->conn;
fid = sp_fid_find(conn, tc->fid);
if (!fid) {
sp_werror(Eunknownfid, EIO);
goto done;
} else
sp_fid_incref(fid);
req->fid = fid;
if (tc->count+IOHDRSZ > conn->msize) {
sp_werror(Etoolarge, EIO);
goto done;
}
if (fid->type&Qtauth) {
if (conn->srv->auth) {
rc = sp_alloc_rread(tc->count);
if (!rc)
goto done;
n = conn->srv->auth->read(fid, tc->offset, tc->count, rc->data);
if (n >= 0)
sp_set_rread_count(rc, n);
else {
free(rc);
rc = NULL;
}
} else
sp_werror(Ebadusefid, EIO);
goto done;
}
if (fid->omode==(u16)~0 || (fid->omode&3)==Owrite) {
sp_werror(Ebadusefid, EIO);
goto done;
}
if (fid->type&Qtdir && tc->offset != fid->diroffset) {
sp_werror(Ebadoffset, EIO);
goto done;
}
rc = (*conn->srv->read)(fid, tc->offset, tc->count, req);
/*
if (rc && rc->id==Rread && fid->type&Qtdir) {
fid->diroffset = tc->offset + rc->count;
}
*/
done:
return rc;
}