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author | Aleix Roca Nonell <aleix.rocanonell@bsc.es> | 2019-08-15 14:03:22 +0200 |
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committer | Jens Axboe <axboe@kernel.dk> | 2019-08-15 11:03:38 -0600 |
commit | 99c79f6692ccdc42e04deea8a36e22bb48168a62 (patch) | |
tree | d665a31392cb938848e7a17e21d7fe2b034ed862 /block | |
parent | ae78ca3cf3d9e9f914bfcd0bc5c389ff18b9c2e0 (diff) | |
download | linux-99c79f6692ccdc42e04deea8a36e22bb48168a62.tar.gz linux-99c79f6692ccdc42e04deea8a36e22bb48168a62.tar.bz2 linux-99c79f6692ccdc42e04deea8a36e22bb48168a62.zip |
io_uring: fix manual setup of iov_iter for fixed buffers
Commit bd11b3a391e3 ("io_uring: don't use iov_iter_advance() for fixed
buffers") introduced an optimization to avoid using the slow
iov_iter_advance by manually populating the iov_iter iterator in some
cases.
However, the computation of the iterator count field was erroneous: The
first bvec was always accounted for an extent of page size even if the
bvec length was smaller.
In consequence, some I/O operations on fixed buffers were unable to
operate on the full extent of the buffer, consistently skipping some
bytes at the end of it.
Fixes: bd11b3a391e3 ("io_uring: don't use iov_iter_advance() for fixed buffers")
Cc: stable@vger.kernel.org
Signed-off-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions