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David Howells <dhowells@redhat.com> says:
Here are some miscellaneous fixes for netfslib and one for cachefiles:
The first six are all in unbuffered/DIO write:
(1) Fix an uninitialised return value from netfs_unbuffered_write().
(2) Fix the normal error return, preferring partial transfer size over
request error over immediate error (e.g. EINTR).
(3) Fix the async error return, preferring partial transfer size over
error.
(4) Fix the update of i_size on partial transfer ending in an error.
(5) Fix a subrequest leak in an error path.
(6) Fix the code to handle subrequest allocation failure.
Then there's:
(7) Fix synchronisation issues with using a progressive rolling buffer for
readahead by fetching everything into it upfront so that the issues
don't arise. Dropping the refs so acquired is deferred until after
I/O is begun.
(8) Change the marking of folios to be copied to the cache to be done
whilst subreqs are being issued rather than at the time they're
collected. Whilst this is not strictly a fix, it means that the
collector thread doesn't need to try and keep track of that, which
means that delayed progress reporting will not be a problem in patch
(9).
(9) Fix read progress reporting to avoid 64-bit tearing on a 32-bit
machine. This has been modified from the previous submission as part
of a different series to take account of a sashiko reported issue[1].
(10) Fix a potential UAF/KASAN warning reported by sashiko[1] in cachefiles
in which the coherency data buffer is cast to a __be64* and
dereferenced in a tracepoint - even though it might not be at least
that large (or aligned).
* patches from https://patch.msgid.link/20260827134304.2075713-1-dhowells@redhat.com:
cachefiles: Fix potential UAF/KASAN warning
netfs: Fix read progress reporting
netfs: Mark folios with COPY_TO_CACHE whilst issuing subreqs
netfs: Fix readahead synchronisation issues by loading all folios upfront
netfs: break unbuffered write when netfs_alloc_subrequest() fails
netfs: Fix subreq ref leak
netfs: Fix i_size update for partial transfer
netfs: Fix error vs transferred passed to ->ki_complete()
netfs: Fix unbuffered/DIO write partial transfer error return
netfs: Fix uninitialized return value in netfs_unbuffered_write()
Link: https://patch.msgid.link/20260827134304.2075713-1-dhowells@redhat.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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