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The buffered write path batches folio creations in the file mapping based on the requested size of the write. Under low free space conditions, it is possible to add a bunch of folios to the mapping and then return a short write or -ENOSPC due to lack of space. If this occurs on an extending write, the file size is updated based on the amount of data successfully written to the file. If folios were added beyond the final i_size, they may hang around until reclaimed, truncated or encountered unexpectedly by another operation. For example, generic/083 reproduces a sequence of events where a short write leaves around one or more post-EOF folios on an inode, a subsequent zero range request extends beyond i_size and overlaps with an aforementioned folio, and __bch2_truncate_folio() happens across it and complains. Update __bch2_buffered_write() to keep track of the start offset of the last folio added to the mapping for a prospective write. After i_size is updated, check whether this offset starts beyond EOF. If so, truncate pagecache beyond the latest EOF to clean up any folios that don't reside at least partially within EOF upon completion of the write. Signed-off-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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 Restructured Text 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.