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e75f9fd194
Commit6e37d24599("btrfs: zoned: fix deadlock on log sync") pointed out a deadlock warning and removed mutex_{lock,unlock} of fs_info::tree_root->log_mutex. While it looks like it always cause a deadlock, we didn't see actual deadlock in fstests runs. The reason is log_root_tree->log_mutex != fs_info->tree_root->log_mutex, not taking the same lock. So, the warning was actually a false-positive. Since btrfs_alloc_log_tree_node() is protected only by fs_info->tree_root->log_mutex, we can (and should) move the code out of the lock scope of log_root_tree->log_mutex and silence the warning. Fixes:6e37d24599("btrfs: zoned: fix deadlock on log sync") Reviewed-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.