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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-01-09 17:02:58 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-01-25 16:58:24 +0100 |
| commit | 9b2e0016d04c6542ace0128eb82ecb3b10c97e43 (patch) | |
| tree | 7354e1e1321f6b8e1117fc77eb49f2c504006fee /Documentation/block | |
| parent | splice: don't generate zero-len segement bvecs (diff) | |
| download | linux-9b2e0016d04c6542ace0128eb82ecb3b10c97e43.tar.xz linux-9b2e0016d04c6542ace0128eb82ecb3b10c97e43.zip | |
bvec/iter: disallow zero-length segment bvecs
zero-length bvec segments are allowed in general, but not handled by bio
and down the block layer so filtered out. This inconsistency may be
confusing and prevent from optimisations. As zero-length segments are
useless and places that were generating them are patched, declare them
not allowed.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/block')
| -rw-r--r-- | Documentation/block/biovecs.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/block/biovecs.rst b/Documentation/block/biovecs.rst index 36771a131b56..ddb867e0185b 100644 --- a/Documentation/block/biovecs.rst +++ b/Documentation/block/biovecs.rst @@ -40,6 +40,8 @@ normal code doesn't have to deal with bi_bvec_done. There is a lower level advance function - bvec_iter_advance() - which takes a pointer to a biovec, not a bio; this is used by the bio integrity code. +As of 5.12 bvec segments with zero bv_len are not supported. + What's all this get us? ======================= |