xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

block: add BIO_NO_PAGE_REF flag

Browse Source 
If bio_iov_iter_get_pages() is called on an iov_iter that is flagged
with NO_REF, then we don't need to add a page reference for the pages
that we add.

Add BIO_NO_PAGE_REF to track this in the bio, so IO completion knows
not to drop a reference to these pages.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-02-27 13:13:23 -07:00
parent 875f1d0769
commit 399254aaf4
4 changed files with 39 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
fs/block_dev.c
View File

@@ -336,12 +336,14 @@ static void blkdev_bio_end_io(struct bio *bio)
if (should_dirty) {
bio_check_pages_dirty(bio);
} else {
struct bio_vec *bvec;
int i;
struct bvec_iter_all iter_all;
if (!bio_flagged(bio, BIO_NO_PAGE_REF)) {
struct bvec_iter_all iter_all;
struct bio_vec *bvec;
int i;
bio_for_each_segment_all(bvec, bio, i, iter_all)
put_page(bvec->bv_page);
bio_for_each_segment_all(bvec, bio, i, iter_all)
put_page(bvec->bv_page);
}
bio_put(bio);
}
}