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9f43d0ff55
Although btrfs is not yet implementing blk_holder_ops, there is a requirement for proper blk_holder_ops: - blkdev_put() must not be called under sb->s_umount The blkdev_put()/bdev_fput() must not be called under sb->s_umount to avoid lock order reversal with disk->open_mutex. This is for the proper blk_holder_ops callbacks. Currently we're fine because we call regular fput() which defers the blk holder reclaiming. To prepare for the future of blk_holder_ops, move the btrfs_close_devices() calls into btrfs_free_fs_info(). That will be called from kill_sb() callbacks, which is also called for error handing during mount failures, or there is already an existing super block. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.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 reStructuredText 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.