diff options
Diffstat (limited to 'sys/fs/udf/udf_vnops.c')
| -rw-r--r-- | sys/fs/udf/udf_vnops.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/sys/fs/udf/udf_vnops.c b/sys/fs/udf/udf_vnops.c index d8da97e8afa6..4d5b3a35c393 100644 --- a/sys/fs/udf/udf_vnops.c +++ b/sys/fs/udf/udf_vnops.c @@ -1045,6 +1045,7 @@ udf_bmap(struct vop_bmap_args *a) struct udf_node *node; uint32_t max_size; daddr_t lsector; + int nblk; int error; node = VTON(a->a_vp); @@ -1075,9 +1076,23 @@ udf_bmap(struct vop_bmap_args *a) /* Translate logical to physical sector number */ *a->a_bnp = lsector << (node->udfmp->bshift - DEV_BSHIFT); - /* Punt on read-ahead for now */ - if (a->a_runp) - *a->a_runp = 0; + /* + * Determine maximum number of readahead blocks following the + * requested block. + */ + if (a->a_runp) { + nblk = (max_size >> node->udfmp->bshift) - 1; + if (nblk <= 0) + *a->a_runp = 0; + else if (nblk >= (MAXBSIZE >> node->udfmp->bshift)) + *a->a_runp = (MAXBSIZE >> node->udfmp->bshift) - 1; + else + *a->a_runp = nblk; + } + + if (a->a_runb) { + *a->a_runb = 0; + } return (0); } |