diff options
| -rw-r--r-- | sys/kern/vfs_bio.c | 26 | ||||
| -rw-r--r-- | sys/sys/buf.h | 1 |
2 files changed, 27 insertions, 0 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index cded596..6f790d2 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -4176,6 +4176,32 @@ unlock: bp->b_resid = 0; } +void +vfs_bio_bzero_buf(struct buf *bp, int base, int size) +{ + vm_page_t m; + int i, n; + + if ((bp->b_flags & B_UNMAPPED) == 0) { + BUF_CHECK_MAPPED(bp); + bzero(bp->b_data + base, size); + } else { + BUF_CHECK_UNMAPPED(bp); + n = PAGE_SIZE - (base & PAGE_MASK); + VM_OBJECT_WLOCK(bp->b_bufobj->bo_object); + for (i = base / PAGE_SIZE; size > 0 && i < bp->b_npages; ++i) { + m = bp->b_pages[i]; + if (n > size) + n = size; + pmap_zero_page_area(m, base & PAGE_MASK, n); + base += n; + size -= n; + n = PAGE_SIZE; + } + VM_OBJECT_WUNLOCK(bp->b_bufobj->bo_object); + } +} + /* * vm_hold_load_pages and vm_hold_free_pages get pages into * a buffers address space. The pages are anonymous and are diff --git a/sys/sys/buf.h b/sys/sys/buf.h index cc8029e..d7025b0 100644 --- a/sys/sys/buf.h +++ b/sys/sys/buf.h @@ -519,6 +519,7 @@ int cluster_read(struct vnode *, u_quad_t, daddr_t, long, struct ucred *, long, int, int, struct buf **); int cluster_wbuild(struct vnode *, long, daddr_t, int, int); void cluster_write(struct vnode *, struct buf *, u_quad_t, int, int); +void vfs_bio_bzero_buf(struct buf *bp, int base, int size); void vfs_bio_set_valid(struct buf *, int base, int size); void vfs_bio_clrbuf(struct buf *); void vfs_busy_pages(struct buf *, int clear_modify); |
