check for that NULL pointer

When truncating indirect blocks, we cannot call bread because we
have already 0'd out pages of triple/double indirect blocks and calls to
bmap will fail. Instead, call getblk, fill in the daddr an

When truncating indirect blocks, we cannot call bread because we
have already 0'd out pages of triple/double indirect blocks and calls to
bmap will fail. Instead, call getblk, fill in the daddr and call strategy
directly.

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Place indirect block pointer at correct offset.

use new queue routines for buffer lists hanging off vnode

Add ufs_bmap and ufs_getlbns declarations.

Add macros to access new fields in ufsmount structure.

Add indir structure.

Add fields to ufsmount structure for integration of ffs/lfs_bmap.

Use ufs_bmap rather than ffs_bmap.

Initialize new fields in ufsmount structure. Pass flag to vinvalbuf.

Use negative block numbers for indirect blocks.

Remove ffs_bmap. Modify ffs_balloc to use ufs_bmap.

Add extra argument to VOP_BMAP.

Add extra argument to VOP_BMAP.

av_forw/av_back are gone; now use b_actf/b_actb for linking active buffers

printing buffer statistics is done in the vfs layer

printing buffer statistics is done at a higher level

printing buffer statistics is done at a higher level

rootvp and swapvp now done in ?fs_mountroot

add ufs_check_export

ensure that correct value is passed

ensure that correct value is passed

fix bug in readdir() for old file systems & LITTLE_ENDIAN.

use radix tree code to match exported host addresses rather than adhoc hash code

use radix tree code to match exported host addresses rather than adhoc hash code