https://github.com/torvalds/linux
Revision 99c79f6692ccdc42e04deea8a36e22bb48168a62 authored by Aleix Roca Nonell on 15 August 2019, 12:03:22 UTC, committed by Jens Axboe on 15 August 2019, 17:03:38 UTC
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>
1 parent ae78ca3
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Tip revision: 99c79f6692ccdc42e04deea8a36e22bb48168a62 authored by Aleix Roca Nonell on 15 August 2019, 12:03:22 UTC
io_uring: fix manual setup of iov_iter for fixed buffers
io_uring: fix manual setup of iov_iter for fixed buffers
Tip revision: 99c79f6
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| .clang-format | -rw-r--r-- | 14.6 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
| .gitignore | -rw-r--r-- | 1.7 KB |
| .mailmap | -rw-r--r-- | 12.2 KB |
| COPYING | -rw-r--r-- | 423 bytes |
| CREDITS | -rw-r--r-- | 97.1 KB |
| Kbuild | -rw-r--r-- | 1.5 KB |
| Kconfig | -rw-r--r-- | 595 bytes |
| MAINTAINERS | -rw-r--r-- | 509.8 KB |
| Makefile | -rw-r--r-- | 59.2 KB |
| README | -rw-r--r-- | 727 bytes |
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