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When querying extents in the extent status tree, we should hold the data_sem if we want to obtain the sequence number as a valid cookie simultaneously. However, currently, ext4_map_blocks() calls ext4_es_lookup_extent() without holding data_sem. Therefore, we should acquire i_es_lock instead, which also ensures that the sequence cookie and the extent remain consistent. Consequently, make ext4_es_lookup_extent() to pass out the sequence number when necessary. Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Message-ID: <20251013015128.499308-4-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.