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block: Convert various code to bio_for_each_segment()

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With immutable biovecs we don't want code accessing bi_io_vec directly -
the uses this patch changes weren't incorrect since they all own the
bio, but it makes the code harder to audit for no good reason - also,
this will help with multipage bvecs later.

Signed-off-by: Kent Overstreet <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Jaegeuk Kim <[email protected]>
Cc: Joern Engel <[email protected]>
Cc: Prasad Joshi <[email protected]>
Cc: Trond Myklebust <[email protected]>
This commit is contained in:
Kent Overstreet 2013-11-07 12:20:26 -08:00
commit 2c30c71bd6
10 changed files with 67 additions and 102 deletions
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16
fs/logfs/dev_bdev.c
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@ -56,22 +56,18 @@ static DECLARE_WAIT_QUEUE_HEAD(wq);
static void writeseg_end_io(struct bio *bio, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec;
int i;
struct super_block *sb = bio->bi_private;
struct logfs_super *super = logfs_super(sb);
struct page *page;
BUG_ON(!uptodate); /* FIXME: Retry io or write elsewhere */
BUG_ON(err);
BUG_ON(bio->bi_vcnt == 0);
do {
page = bvec->bv_page;
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
end_page_writeback(page);
page_cache_release(page);
} while (bvec >= bio->bi_io_vec);
bio_for_each_segment_all(bvec, bio, i) {
end_page_writeback(bvec->bv_page);
page_cache_release(bvec->bv_page);
}
bio_put(bio);
if (atomic_dec_and_test(&super->s_pending_writes))
wake_up(&wq);