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| author |   Pavel Begunkov <asml.silence@gmail.com> | 2021-01-09 16:02:58 +0000 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-01-25 08:58:24 -0700 |
| commit | 9b2e0016d04c6542ace0128eb82ecb3b10c97e43 (patch) | |
| tree | 7354e1e1321f6b8e1117fc77eb49f2c504006fee /Documentation/filesystems | |
| parent | splice: don't generate zero-len segement bvecs (diff) | |
| download | linux-dev-9b2e0016d04c6542ace0128eb82ecb3b10c97e43.tar.xz linux-dev-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/filesystems')
| -rw-r--r-- | Documentation/filesystems/porting.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst index 867036aa90b8..c722d94f29ea 100644 --- a/Documentation/filesystems/porting.rst +++ b/Documentation/filesystems/porting.rst @@ -865,3 +865,10 @@ no matter what. Everything is handled by the caller. clone_private_mount() returns a longterm mount now, so the proper destructor of its result is kern_unmount() or kern_unmount_array(). + +--- + +**mandatory** + +zero-length bvec segments are disallowed, they must be filtered out before +passed on to an iterator. |