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5a11b5fe79
When investigating transient failures of generic/441 on bcachefs, it was determined that the cause of the failure was a combination of unconditional emergency shutdown and racing between background journal activity and the test switchover from a working device mapper table to an error injecting table. Part of the reason for this sequence of events is that bcachefs aggressively flushes as much as possible during fsync(), regardless of errors. While this is reasonable behavior, it is technically unnecessary because once an error is returned from fsync(), the caller cannot make any assumptions about the resilience of data. Tweak the bch2_fsync() logic to return an error on failure of any of the steps involved in the flush. Note that this change alone does not prevent generic/441 failure, but in combination with a test tweak to avoid racing during the dm-error table switchover it avoids the unnecessary shutdowns and allows the test to pass reliably on bcachefs. 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.