[PATCH] Document bi_sector and sector_t
Signed-Off-By: Roger Gammans <rgammans@computer-surgery.co.uk>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 711c321..092dbd0 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -70,7 +70,8 @@
* stacking drivers)
*/
struct bio {
- sector_t bi_sector;
+ sector_t bi_sector; /* device address in 512 byte
+ sectors */
struct bio *bi_next; /* request queue link */
struct block_device *bi_bdev;
unsigned long bi_flags; /* status, command, etc */
diff --git a/include/linux/types.h b/include/linux/types.h
index 406d4ae..750f085 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -129,8 +129,12 @@
/* this is a special 64bit data type that is 8-byte aligned */
#define aligned_u64 unsigned long long __attribute__((aligned(8)))
-/*
+/**
* The type used for indexing onto a disc or disc partition.
+ *
+ * Linux always considers sectors to be 512 bytes long independently
+ * of the devices real block size.
+ *
* If required, asm/types.h can override it and define
* HAVE_SECTOR_T
*/