diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1e7005e6c..f2d143359 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -38,6 +38,9 @@ typedef struct request ** (queue_proc) (kdev_t dev); struct blk_dev_struct { request_fn_proc *request_fn; + /* + * queue_proc has to be atomic + */ queue_proc *queue; void *data; struct request *current_request; @@ -72,4 +75,15 @@ extern int * max_readahead[MAX_BLKDEV]; extern int * max_sectors[MAX_BLKDEV]; +#define MAX_SECTORS 244 /* 254 ? */ + +#define PageAlignSize(size) (((size) + PAGE_SIZE -1) & PAGE_MASK) +#if 0 /* small readahead */ +#define MAX_READAHEAD PageAlignSize(4096*7) +#define MIN_READAHEAD PageAlignSize(4096*2) +#else /* large readahead */ +#define MAX_READAHEAD PageAlignSize(4096*18) +#define MIN_READAHEAD PageAlignSize(4096*3) +#endif + #endif |