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block: remove the BIO_NULL_MAPPED flag 

We can simply use a boolean flag in the bio_map_data data structure
instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-08-27 17:37:45 +02:00 committed by Jens Axboe
parent c13f0fbc4c
commit f3256075ba
2 changed files with 5 additions and 5 deletions
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9
block/blk-map.c
View File

@ -12,7 +12,8 @@
#include "blk.h"
struct bio_map_data {
int is_our_pages;
bool is_our_pages : 1;
bool is_null_mapped : 1;
struct iov_iter iter;
struct iovec iov[];
};
@ -108,7 +109,7 @@ static int bio_uncopy_user(struct bio *bio)
struct bio_map_data *bmd = bio->bi_private;
int ret = 0;
if (!bio_flagged(bio, BIO_NULL_MAPPED)) {
if (!bmd || !bmd->is_null_mapped) {
/*
* if we're in a workqueue, the request is orphaned, so
* don't copy into a random user address space, just free
@ -158,7 +159,7 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
* The caller provided iov might point to an on-stack or otherwise
* shortlived one.
*/
bmd->is_our_pages = map_data ? 0 : 1;
bmd->is_our_pages = !map_data;
nr_pages = DIV_ROUND_UP(offset + len, PAGE_SIZE);
if (nr_pages > BIO_MAX_PAGES)
@ -234,7 +235,7 @@ static struct bio *bio_copy_user_iov(struct request_queue *q,
bio->bi_private = bmd;
if (map_data && map_data->null_mapped)
bio_set_flag(bio, BIO_NULL_MAPPED);
bmd->is_null_mapped = true;
return bio;
cleanup:
if (!map_data)

1
include/linux/blk_types.h
View File

@ -257,7 +257,6 @@ enum {
BIO_CLONED, /* doesn't own data */
BIO_BOUNCED, /* bio is a bounce bio */
BIO_USER_MAPPED, /* contains user pages */
BIO_NULL_MAPPED, /* contains invalid user pages */
BIO_WORKINGSET, /* contains userspace workingset pages */
BIO_QUIET, /* Make BIO Quiet */
BIO_CHAIN, /* chained bio, ->bi_remaining in effect */