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fs: decouple READ and WRITE from the block layer ops

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Move READ and WRITE to kernel.h and don't define them in terms of block
layer ops; they are our generic data direction indicators these days
and have no more resemblance with the block layer ops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2016-11-01 07:40:11 -06:00 committed by Jens Axboe
parent 70fd76140a
commit d38499530e
4 changed files with 11 additions and 14 deletions
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6
include/linux/bio.h
View file

@ -62,6 +62,12 @@
#define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9)
#define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio)))
/*
* Return the data direction, READ or WRITE.
*/
#define bio_data_dir(bio) \
(op_is_write(bio_op(bio)) ? WRITE : READ)
/*
* Check whether this bio carries any data or not. A NULL bio is allowed.
*/

13
include/linux/fs.h
View file

@ -151,11 +151,6 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
*/
#define CHECK_IOVEC_ONLY -1
#define RW_MASK REQ_OP_WRITE
#define READ REQ_OP_READ
#define WRITE REQ_OP_WRITE
/*
* Attribute flags. These should be or-ed together to figure out what
* has been changed!
@ -2452,14 +2447,6 @@ extern void make_bad_inode(struct inode *);
extern bool is_bad_inode(struct inode *);
#ifdef CONFIG_BLOCK
/*
* return data direction, READ or WRITE
*/
static inline int bio_data_dir(struct bio *bio)
{
return op_is_write(bio_op(bio)) ? WRITE : READ;
}
extern void check_disk_size_change(struct gendisk *disk,
struct block_device *bdev);
extern int revalidate_disk(struct gendisk *);

4
include/linux/kernel.h
View file

@ -50,6 +50,10 @@
#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
/* generic data direction definitions */
#define READ 0
#define WRITE 1
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
#define u64_to_user_ptr(x) ( \

2
include/linux/uio.h
View file

@ -125,7 +125,7 @@ static inline bool iter_is_iovec(const struct iov_iter *i)
*
* The ?: is just for type safety.
*/
#define iov_iter_rw(i) ((0 ? (struct iov_iter *)0 : (i))->type & RW_MASK)
#define iov_iter_rw(i) ((0 ? (struct iov_iter *)0 : (i))->type & (READ | WRITE))
/*
* Cap the iov_iter by given limit; note that the second argument is