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d92f03395a
commit a60adce85f4bb5c1ef8ffcebadd702cafa2f3696 upstream. When free'ing extents in a block group we check to see if the block group is not cached, and then cache it if we need to. However we'll just carry on as long as we're loading the cache. This is problematic because we are dirtying the block group here. If we are fast enough we could do a transaction commit and clear the free space cache while we're still loading the space cache in another thread. This truncates the free space inode, which will keep it from loading the space cache. Fix this by using the btrfs_block_group_cache_done helper so that we try to load the space cache unconditionally here, which will result in the caller waiting for the fast caching to complete and keep us from truncating the free space inode. CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
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.