diff options
Diffstat (limited to 'sys/fs/cd9660')
-rw-r--r-- | sys/fs/cd9660/cd9660_lookup.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/sys/fs/cd9660/cd9660_lookup.c b/sys/fs/cd9660/cd9660_lookup.c index 979c0bd..90dd62b 100644 --- a/sys/fs/cd9660/cd9660_lookup.c +++ b/sys/fs/cd9660/cd9660_lookup.c @@ -415,12 +415,34 @@ cd9660_blkatoff(vp, offset, res, bpp) imp = ip->i_mnt; lbn = lblkno(imp, offset); bsize = blksize(imp, ip, lbn); - + if ((error = bread(vp, lbn, bsize, NOCRED, &bp)) != 0) { brelse(bp); *bpp = NULL; return (error); } + + /* + * We must BMAP the buffer because the directory code may use b_blkno + * to calculate the inode for certain types of directory entries. + * We could get away with not doing it before we VMIO-backed the + * directories because the buffers would get freed atomically with + * the invalidation of their data. But with VMIO-backed buffers + * the buffers may be freed and then later reconstituted - and the + * reconstituted buffer will have no knowledge of b_blkno. + */ + if (bp->b_blkno == bp->b_lblkno) { + error = VOP_BMAP(vp, bp->b_lblkno, NULL, + &bp->b_blkno, NULL, NULL); + if (error) { + bp->b_error = error; + bp->b_flags |= B_ERROR; + brelse(bp); + *bpp = NULL; + return (error); + } + } + if (res) *res = (char *)bp->b_data + blkoff(imp, offset); *bpp = bp; |