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bcachefs: Fix for __readahead_batch getting partial batch 

We were incorrectly ignoring the return value of __readahead_batch,
leading to a null ptr deref in __bch2_page_state_create().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-11-29 16:00:47 -05:00 committed by Kent Overstreet
parent 33b3b1dc0f
commit 89931472c2
1 changed files with 1 additions and 1 deletions
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2
fs/bcachefs/fs-io.c
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@ -667,7 +667,7 @@ static int readpages_iter_init(struct readpages_iter *iter,
if (!iter->pages)
return -ENOMEM;
__readahead_batch(ractl, iter->pages, nr_pages);
nr_pages = __readahead_batch(ractl, iter->pages, nr_pages);
for (i = 0; i < nr_pages; i++) {
__bch2_page_state_create(iter->pages[i], __GFP_NOFAIL);
put_page(iter->pages[i]);