diff options
Diffstat (limited to 'sys/kern/vfs_bio.c')
| -rw-r--r-- | sys/kern/vfs_bio.c | 26 |
1 files changed, 26 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 |
