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The ext_tree_encode_commit() function may be called multiple times for the same file, layout, and last written byte if the provided buffer is not large enough to encode all extents in it. The first problem is that the last written byte field must be zeroed only on a successful call, otherwise we will lose its actual value and get an integer overflow on the next encoding attempt. The second problem is that we can't count and encode in one pass. The extent state changes during encoding, so if we return -ENOSPC but have already encoded some extents into a small buffer, they will not be re-encoded into a new larger buffer on the next try. As a result, the client never commits these extents to the server. Co-developed-by: Konstantin Evtushenko <koevtushenko@yandex.com> Signed-off-by: Konstantin Evtushenko <koevtushenko@yandex.com> Signed-off-by: Sergey Bashirov <sergeybashirov@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20250630183537.196479-3-sergeybashirov@gmail.com Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.