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22fedd80b6
If xfs_iflush_cluster() fails due to corruption, the error path issues a shutdown and simulates an I/O completion to release the buffer. This code has a couple small problems. First, the shutdown sequence can issue a synchronous log force, which is unsafe to do with buffer locks held. Second, the simulated I/O completion does not guarantee the buffer is async and thus is unlocked and released. For example, if the last operation on the buffer was a read off disk prior to the corruption event, XBF_ASYNC is not set and the buffer is left locked and held upon return. This results in a memory leak as shown by the following message on module unload: BUG xfs_buf (...): Objects remaining in xfs_buf on __kmem_cache_shutdown() Fix both of these problems by setting XBF_ASYNC on the buffer prior to the simulated I/O error and performing the shutdown immediately after ioend processing when the buffer has been released. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> |
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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.