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buffer: set BIO_COMPLETE_IN_TASK for dropbehind writeback

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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 <hch@lst.de>
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260730-blk-dontcache-v7-4-3e8e6850068d@columbia.edu
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tal Zussman 2026-07-30 02:57:54 -04:00 committed by Jens Axboe
parent efbde6f9f4
commit a2c924c240
1 changed files with 3 additions and 0 deletions
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3
fs/buffer.c
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@ -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);