sh_off_t file_size;
sh_off_t file_extend;
sh_off_t window_pos;
+ uns window_size;
int mode;
};
#define FB_MMAP(f) ((struct fb_mmap *)(f)->is_fastbuf)
sh_off_t pos0 = f->pos & ~(sh_off_t)(CPU_PAGE_SIZE-1);
int l = MIN((sh_off_t)mmap_window_size, F->file_extend - pos0);
uns ll = ALIGN_TO(l, CPU_PAGE_SIZE);
- uns oll = ALIGN_TO(f->bufend - f->buffer, CPU_PAGE_SIZE);
int prot = ((F->mode & O_ACCMODE) == O_RDONLY) ? PROT_READ : (PROT_READ | PROT_WRITE);
DBG(" ... Mapping %x(%x)+%x(%x) len=%x extend=%x", (int)pos0, (int)f->pos, ll, l, (int)F->file_size, (int)F->file_extend);
- if (ll != oll && f->buffer)
+ if (ll != F->window_size && f->buffer)
{
- munmap(f->buffer, oll);
+ munmap(f->buffer, F->window_size);
f->buffer = NULL;
}
+ F->window_size = ll;
if (!f->buffer)
f->buffer = sh_mmap(NULL, ll, prot, MAP_SHARED, F->fd, pos0);
else
ASSERT(whence == SEEK_SET);
ASSERT(pos >= 0 && pos <= FB_MMAP(f)->file_size);
f->pos = pos;
- f->bptr = f->bstop = f->bufend; /* force refill/spout call */
+ f->bptr = f->bstop = f->bufend = f->buffer; /* force refill/spout call */
DBG("Seek -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);
return 1;
}
struct fb_mmap *F = FB_MMAP(f);
if (f->buffer)
- munmap(f->buffer, ALIGN_TO(f->bufend-f->buffer, CPU_PAGE_SIZE));
+ munmap(f->buffer, F->window_size);
if (F->file_extend > F->file_size &&
sh_ftruncate(F->fd, F->file_size))
die("ftruncate(%s): %m", f->name);
return f;
}
-struct fastbuf *
-bopen_mm(byte *name, uns mode)
-{
- return bopen_file(name, mode, &(struct fb_params){ .type = FB_MMAP });
-}
-
#ifdef TEST
int main(int argc, char **argv)