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When yangerkun review commit93cdf49f6e("ext4: Fix best extent lstart adjustment logic in ext4_mb_new_inode_pa()"), it was found that the best extent did not completely cover the original request after adjusting the best extent lstart in ext4_mb_new_inode_pa() as follows: original request: 2/10(8) normalized request: 0/64(64) best extent: 0/9(9) When we check if best ex can be kept at start of goal, ac_o_ex.fe_logical is 2 less than the adjusted best extent logical end 9, so we think the adjustment is done. But obviously 0/9(9) doesn't cover 2/10(8), so we should determine here if the original request logical end is less than or equal to the adjusted best extent logical end. In addition, add a comment stating when adjusted best_ex will not cover the original request, and remove the duplicate assertion because adjusting lstart makes no change to b_ex.fe_len. Link: https://lore.kernel.org/r/3630fa7f-b432-7afd-5f79-781bc3b2c5ea@huawei.com Fixes:93cdf49f6e("ext4: Fix best extent lstart adjustment logic in ext4_mb_new_inode_pa()") Cc: <stable@kernel.org> Signed-off-by: yangerkun <yangerkun@huawei.com> Signed-off-by: Baokun Li <libaokun1@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Link: https://lore.kernel.org/r/20240201141845.1879253-1-libaokun1@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
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In order to build the documentation, use ``make htmldocs`` or
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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.