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block: Fix page refcounts for unaligned buffers in __bio_release_pages() 

commit 38b43539d6 upstream.

Fix an incorrect number of pages being released for buffers that do not
start at the beginning of a page.

Fixes: 1b151e2435 ("block: Remove special-casing of compound pages")
Cc: stable@vger.kernel.org
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Tested-by: Greg Edwards <gedwards@ddn.com>
Link: https://lore.kernel.org/r/86e592a9-98d4-4cff-a646-0c0084328356@cybernetics.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[ Tony: backport to v6.1 by replacing bio_release_page() loop with
  folio_put_refs() as commits fd363244e8 and e4cc64657b are not
  present. ]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tony Battersby 2024-02-29 13:08:09 -05:00 committed by Greg Kroah-Hartman
parent 4f2debd9c6
commit 242006996d
1 changed files with 4 additions and 7 deletions
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11
block/bio.c
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@ -1112,19 +1112,16 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty)
struct folio_iter fi;
bio_for_each_folio_all(fi, bio) {
struct page *page;
size_t done = 0;
size_t nr_pages;
if (mark_dirty) {
folio_lock(fi.folio);
folio_mark_dirty(fi.folio);
folio_unlock(fi.folio);
}
page = folio_page(fi.folio, fi.offset / PAGE_SIZE);
do {
folio_put(fi.folio);
done += PAGE_SIZE;
} while (done < fi.length);
nr_pages = (fi.offset + fi.length - 1) / PAGE_SIZE -
fi.offset / PAGE_SIZE + 1;
folio_put_refs(fi.folio, nr_pages);
}
}
EXPORT_SYMBOL_GPL(__bio_release_pages);