bcachefs: Handle ec_buf not being page aligned when allocating bio

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/io.c b/fs/bcachefs/io.c
index 5db83374403b83534f4c46925c2695a94d57146a..117d1faa99f2e4a56506013cc3f288f4603ffa5a 100644 (file)
--- a/fs/bcachefs/io.c
+++ b/fs/bcachefs/io.c
@@ -461,7 +461,10 @@ static struct bio *bch2_write_bio_alloc(struct bch_fs *c,
        struct bio *bio;
        unsigned output_available =
                min(wp->sectors_free << 9, src->bi_iter.bi_size);
-       unsigned pages = DIV_ROUND_UP(output_available, PAGE_SIZE);
+       unsigned pages = DIV_ROUND_UP(output_available +
+                                     (buf
+                                      ? ((unsigned long) buf & (PAGE_SIZE - 1))
+                                      : 0), PAGE_SIZE);
 
        bio = bio_alloc_bioset(NULL, pages, 0,
                               GFP_NOIO, &c->bio_write);