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In data=journal mode, page should be dirtied only when it has buffers for checkpoint or it is writeably mapped. In the first case, we don't need to do anything special. In the second case, page was already added to the journal by ext4_page_mkwrite() and since transaction commit writeprotects mapped pages again, page should be writeable (and thus dirtied) only while it is part of the running transaction. So nothing needs to be done either. The only special case is when someone pins the page and uses this pin for modifying page data. So recognize this special case and only then mark the page as having data that needs adding to the journal. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/20230228051319.4085470-4-tytso@mit.edu
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.