Set BIO_COMPLETE_IN_TASK in __bh_submit() for write bios when the folio has dropbehind set, so that buffer_head writeback completions get deferred to task context where folio_end_dropbehind() can safely invalidate folios.
Read completions are not deferred since dropbehind invalidation for reads is handled synchronously by the reader. Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Tal Zussman <[email protected]> --- fs/buffer.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/buffer.c b/fs/buffer.c index 9af5f061a1f8..6f099847240e 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1203,6 +1203,9 @@ static void __bh_submit(struct buffer_head *bh, blk_opf_t opf, bio = bio_alloc(bh->b_bdev, 1, opf, GFP_NOIO); + if (folio_test_dropbehind(bh->b_folio) && op_is_write(opf)) + bio_set_flag(bio, BIO_COMPLETE_IN_TASK); + if (IS_ENABLED(CONFIG_FS_ENCRYPTION)) buffer_set_crypto_ctx(bio, bh, GFP_NOIO); -- 2.39.5
