diff options
| author | Tal Zussman <tz2294@columbia.edu> | 2026-07-30 02:57:51 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-07-31 09:00:14 -0600 |
| commit | 8ed0831b5263e1aa48d99063795a1f20e4e69b50 (patch) | |
| tree | 8004db5327c522c49734779ea46911e8108849a1 /include | |
| parent | 14b007e178811db72fbb1ebb3535160db6ec1e6a (diff) | |
block: introduce bio_in_atomic()
Move the atomic context detection logic from erofs's z_erofs_in_atomic()
into the block layer as bio_in_atomic(). This helper returns true when
the current context is unsafe for sleeping bio completion handlers (e.g.,
hard/soft IRQ, preempt-disabled).
The logic was originally added to erofs in commit c99fab6e80b7 ("erofs:
fix atomic context detection when !CONFIG_DEBUG_LOCK_ALLOC"). A
subsequent patch will use it in the block layer's bio completion
infrastructure, so move it to include/linux/bio.h where both subsystems
can share it.
Convert erofs to call the new bio_in_atomic() directly.
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260730-blk-dontcache-v7-1-3e8e6850068d@columbia.edu
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index ce34ea49ef35..e8f5b7938a7f 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -368,6 +368,21 @@ static inline struct bio *bio_alloc(struct block_device *bdev, void submit_bio(struct bio *bio); +/** + * bio_in_atomic - check if the current context is unsafe for bio completion + * + * Return: %true in atomic contexts (e.g. hard/soft IRQ, preempt-disabled); + * %false when a bio can be safely completed in the current context. + */ +static inline bool bio_in_atomic(void) +{ + if (IS_ENABLED(CONFIG_PREEMPTION) && rcu_preempt_depth()) + return true; + if (!IS_ENABLED(CONFIG_PREEMPT_COUNT)) + return true; + return !preemptible(); +} + extern void bio_endio(struct bio *); /** |