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882af9f13e
During free space tree rebuild, we're holding a transaction handle for the whole rebuild process. This can lead to blocked task warning, e.g. btrfs-transaction kthread (which is already created before btrfs_start_pre_rw_mount()) can be waked up to join and commit the current transaction. But the free space tree rebuild process may need to go through thousands block groups, this will block btrfs-transaction kthread for a long time. Fix the problem by calling btrfs_should_end_transaction() after each block group, so that we won't hold the transaction handle too long. And since the free-space-tree rebuild can be split into multiple transactions, we need to consider the safety when the rebuild process is interrupted. Thankfully since we only set the FREE_SPACE_TREE compat_ro flag without FREE_SPACE_TREE_VALID flag, even if the rebuild is interrupted, on the next RW mount, we will still go rebuild the free space tree, by deleting any items we have and re-starting the rebuild from scratch. Reviewed-by: Filipe Manana <fdmanana@suse.com> 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.