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btrfs: use the folio iterator in btrfs_end_super_write()

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Iterate over folios instead of bvecs.  Switch the order of unlock and put
to be the usual order; we know this folio can't be put until it's been
waited for, but that's fragile.  Remove the calls to ClearPageUptodate /
SetPageUptodate -- if PAGE_SIZE is larger than BTRFS_SUPER_INFO_SIZE,
we'd be marking the entire folio uptodate without having actually
initialised all the bytes in the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-04-20 03:49:58 +01:00 committed by David Sterba
parent f93ee0df51
commit 617fb10ea8
1 changed files with 6 additions and 13 deletions
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19
fs/btrfs/disk-io.c
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@ -3626,28 +3626,21 @@ ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
static void btrfs_end_super_write(struct bio *bio)
{
struct btrfs_device *device = bio->bi_private;
struct bio_vec *bvec;
struct bvec_iter_all iter_all;
struct page *page;
bio_for_each_segment_all(bvec, bio, iter_all) {
page = bvec->bv_page;
struct folio_iter fi;
bio_for_each_folio_all(fi, bio) {
if (bio->bi_status) {
btrfs_warn_rl_in_rcu(device->fs_info,
"lost page write due to IO error on %s (%d)",
"lost super block write due to IO error on %s (%d)",
btrfs_dev_name(device),
blk_status_to_errno(bio->bi_status));
ClearPageUptodate(page);
SetPageError(page);
folio_set_error(fi.folio);
btrfs_dev_stat_inc_and_print(device,
BTRFS_DEV_STAT_WRITE_ERRS);
} else {
SetPageUptodate(page);
}
put_page(page);
unlock_page(page);
folio_unlock(fi.folio);
folio_put(fi.folio);
}
bio_put(bio);