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Log recovery of v4 filesystems does not use buffer verifiers because log recovery historically can result in transient buffer corruption when target buffers might be ahead of the log after a crash. v5 filesystems work around this problem with metadata LSN ordering. While this log recovery verifier behavior is necessary on v4 supers, it can result in leaving buffers around in the LRU without verifiers attached for a significant amount of time. This leads to use of unverified buffers while the filesystem is in active use, long after recovery has completed. To address this problem, drain all buffers from the LRU as a final step of the log mount sequence. Note that this is done unconditionally to provide a consistently clean cache footprint, regardless of superblock version or log state. As a side effect, this ensures that all cache resident, unverified buffers are reclaimed after log recovery and therefore must be recreated with verifiers on subsequent use. Reported-by: Darrick Wong <darrick.wong@oracle.com> 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 ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.