block: introduce bio_in_atomic()

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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 c99fab6e80 ("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>

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This commit is contained in:

Tal Zussman 2026-07-30 02:57:51 -04:00 • committed by Jens Axboe

parent 14b007e178

commit 8ed0831b52

2 changed files with 16 additions and 10 deletions

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11

fs/erofs/zdata.c

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15

include/linux/bio.h

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