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Now that we have mext_move_extent(), we can switch to this new interface and deprecate move_extent_per_page(). First, after acquiring the i_rwsem, we can directly use ext4_map_blocks() to obtain a contiguous extent from the original inode as the extent to be moved. It can and it's safe to get mapping information from the extent status tree without needing to access the ondisk extent tree, because ext4_move_extent() will check the sequence cookie under the folio lock. Then, after populating the mext_data structure, we call ext4_move_extent() to move the extent. Finally, the length of the extent will be adjusted in mext.orig_map.m_len and the actual length moved is returned through m_len. Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Message-ID: <20251013015128.499308-11-yi.zhang@huaweicloud.com> Signed-off-by: Theodore Ts'o <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 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.