diff options
Diffstat (limited to 'sys/fs/udf/udf_vnops.c')
| -rw-r--r-- | sys/fs/udf/udf_vnops.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/sys/fs/udf/udf_vnops.c b/sys/fs/udf/udf_vnops.c index 4d5b3a3..5afb038 100644 --- a/sys/fs/udf/udf_vnops.c +++ b/sys/fs/udf/udf_vnops.c @@ -1296,16 +1296,20 @@ static int udf_readatoffset(struct udf_node *node, int *size, off_t offset, struct buf **bp, uint8_t **data) { - struct udf_mnt *udfmp; - struct file_entry *fentry = NULL; + struct udf_mnt *udfmp = node->udfmp; + struct vnode *vp = node->i_vnode; + struct file_entry *fentry; struct buf *bp1; uint32_t max_size; daddr_t sector; + off_t off; + int adj_size; int error; - udfmp = node->udfmp; - - *bp = NULL; + /* + * This call is made *not* only to detect UDF_INVALID_BMAP case, + * max_size is used as an ad-hoc read-ahead hint for "normal" case. + */ error = udf_bmap_internal(node, offset, §or, &max_size); if (error == UDF_INVALID_BMAP) { /* @@ -1323,9 +1327,18 @@ udf_readatoffset(struct udf_node *node, int *size, off_t offset, /* Adjust the size so that it is within range */ if (*size == 0 || *size > max_size) *size = max_size; - *size = min(*size, MAXBSIZE); - if ((error = udf_readlblks(udfmp, sector, *size + (offset & udfmp->bmask), bp))) { + /* + * Because we will read starting at block boundary, we need to adjust + * how much we need to read so that all promised data is in. + * Also, we can't promise to read more than MAXBSIZE bytes starting + * from block boundary, so adjust what we promise too. + */ + off = blkoff(udfmp, offset); + *size = min(*size, MAXBSIZE - off); + adj_size = (*size + off + udfmp->bmask) & ~udfmp->bmask; + *bp = NULL; + if ((error = bread(vp, lblkno(udfmp, offset), adj_size, NOCRED, bp))) { printf("warning: udf_readlblks returned error %d\n", error); /* note: *bp may be non-NULL */ return (error); |
