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11f117374a
bch2_path_put_nokeep() is sketchy, and we should consider removing it: it unconditionally frees btree_paths once their ref hits 0. The assumption is that we only use it for paths that have never been visible outside the btree core btree code; i.e. higher level code will never be making assumptions about locking based on these paths. However, there's subtle brokenness with this approach: - If we call bch2_path_put(), then bch2_path_put_nokeep(), bch2_path_put() may free the first path on the assumption that we we have another path keeping a node locked - but then bch2_path_put_nokeep() just unconditionally frees it. The same bug may arise if we're calling bch2_path_put() and bch2_path_put_nokeep() on the same (refcounted) path, or two adjacent paths that point to the same btree node. This patch hacks around one of these bugs by calling bch2_path_put_nokeep() first in bch2_trans_iter_exit. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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.